Wet-type flywheel brake integrated into oil film quill

Information

  • Patent Grant
  • 6386332
  • Patent Number
    6,386,332
  • Date Filed
    Friday, June 2, 2000
    24 years ago
  • Date Issued
    Tuesday, May 14, 2002
    22 years ago
Abstract
A wet-type flywheel brake system for use in a mechanical press includes a first and second brake assembly each installed within a respective brake housing space defined in a non-rotational quill. Each of the brake assemblies includes a brake lining element arranged in lateral facing relationship with the flywheel and an associated hydraulic seal-type piston that selectively moves the brake lining element into a friction-type braking engagement with the flywheel. The brake housing spaces are flooded with oil to immerse the brake lining elements. Oil for this purpose is provided from a flywheel bearing assembly integrated with the quill assembly and which is arranged for fluid communication with the quill-located brake housing spaces.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




The present invention relates to a braking system for use with a flywheel of a mechanical press and, more particularly, to a wet-type flywheel brake assembly integrated into the quill assembly and which uses oil provided to the flywheel bushing assembly.




2. Description of the Related Art




Mechanical presses of the type performing industrial activity such as stamping and drawing operations have a conventional configuration including a frame structure with a crown and bed portion and a slide supported within the frame for reciprocating movement toward and away from the bed. A crankshaft rotatably disposed within the crown is arranged in driving connection with the slide using a connecting arm assembly. A flywheel assembly rotatably driven by a drive mechanism is selectively connectable with the crankshaft for driving rotation thereof, utilizing a clutch/brake combination to make the driving connection. These mechanical presses are used in a wide variety of workpiece operations employing a large selection of die sets, with the press machine varying substantially in size and available tonnage depending upon the intended use.




The primary source for stored mechanical energy in mechanical presses is the flywheel, which is conventionally located between the main drive motor and the clutch. The flywheel and its associated bearing are mounted on either the driveshaft, crankshaft, or the press frame by use of a quill. The main drive motor replenishes the energy lost from the flywheel during press stamping operations when the clutch couples the flywheel to the press driven parts. During engagement of the clutch, the flywheel drops in speed as the press driven parts are brought up to press running speed. The flywheel rotates in unison with the engaged clutch while the flywheel bearings have no relative rotation, except for the case of a quill arrangement whereby relative rotation is always present.




Prior art flywheel brakes are usually pneumatically-applied dry-friction brakes subject to considerable wear due to their design and must be serviced and replaced frequently. The flywheel brake is typically mounted in or on the press crown, so if it must be serviced, the press must be shut down while maintenance personnel gain access to and repair the flywheel brake and/or renew the linings. Press down time leads to lost production, adding to the expense of flywheel brake service. In addition, due to the many different flywheel and press structures, multiple costly flywheel brake mounting configurations are used.




SUMMARY OF THE INVENTION




One object of the present invention to reduce the necessity to replace flywheel brake linings, to considerably extend the time interval between lining replacements, and to simplify the attachment of such a flywheel brake to the press structure.




According to the present invention there is disclosed a wet-type flywheel brake system integrated into an oil film quill for use in a mechanical press. The brake system includes a first and second brake assembly each installably mounted within a respective brake housing space defined in a quill, which is non-rotationally connected to the press. Each of the brake assemblies preferably includes a flywheel engaging member in the form of a brake lining element that is arranged in facing relationship with the flywheel at a respective side thereof, and further includes an associated hydraulic piston member in the form of an annular seal. Activation of the hydraulic seal-type piston selectively moves the facing brake lining element into a friction-type braking engagement with the flywheel to effect the desired flywheel braking activity. The quill-located brake housing spaces are flooded with oil to fully immerse at least the brake lining elements and thereby develop the wet-type feature associated with the flywheel braking device. The action of the oil between the frictional surfaces prevents or reduces lining wear to an insignificant level, thus extending lining life indefinitely. The oil also removes the heat of engagement which is destructive to the lining and its contact surface. Oil is preferably communicated from the flywheel bearing assembly, which is preferably provided in the form of a hydrostatic bearing pad assembly integrally associated with the quill assembly and arranged for fluid communication with the brake housing spaces. Alternative bearings, for example, hydrodynamic bushings or tapered roller bearings could be used to support the flywheel and the oil coming off these bearing types could be used to flood the flywheel brake linings.




The invention, in one form thereof, relates to a mechanical press comprising, in combination, a frame structure with a crown and a bed; a slide guided by the frame structure for reciprocating movement in opposed relation to the bed; a drive mechanism attached to the frame structure; a quill assembly having a quill non-rotationally connected to the press; a flywheel assembly rotatably driven by the drive mechanism, the flywheel assembly including a flywheel rotatable relative to the frame structure and axially mounted to the quill; a crankshaft rotatably disposed within the crown and in driving connection with the slide, the crankshaft selectively connectable with the flywheel for driving rotation thereby; the quill including a first recess formed therein and disposed adjacent the flywheel at one side thereof, the first quill recess defining a first chamber; the quill further including a second recess formed therein and disposed adjacent the flywheel at another side thereof, the second quill recess defining a second chamber; and a brake system operatively associated with the flywheel. The brake system comprises, in combination, a first brake assembly, which is disposed at least in part within the first quill recess, for selectively applying a braking action to the flywheel; and a second brake assembly, which is disposed at least in part within the second quill recess, for selectively applying a braking action to the flywheel.




Each one of the first and second brake assemblies, in one form thereof, further comprises a respective flywheel engaging member arranged in facing relationship with the flywheel at the respective side thereof; and an associated hydraulic piston means for selectively reversibly moving the flywheel engaging member into braking engagement with the flywheel in response to the hydraulic activation thereof. A means is provided for supplying fluid to at least one of the first quill recess and the second quill recess to enable hydraulic contact with at least the flywheel engaging member associated therewith.




The mechanical press, in another form thereof, further comprises a flywheel bearing supporting the flywheel assembly, the flywheel bearing including at least one bearing assembly disposed between the quill and the flywheel. The at least one bearing assembly comprises a hydrostatic bearing pad means that is arranged, at least in part, for fluid communication with each one of the first quill recess and the second quill recess to enable hydraulic contact (e.g., immersion) with the flywheel engaging member associated therewith. There is included a means to provide pressurized fluid to the hydrostatic bearing pad means. The hydrostatic bearing pad means comprise, in one form thereof, a plurality of hydrostatic bearing pads formed in the quill and disposed in opposing facing relationship to a bushing connected to the flywheel and annularly disposed about the quill. A clearance space defined between the plurality of hydrostatic bearing pads and the bushing is arranged for fluid communication with each one of the first quill recess and the second quill recess.




The mechanical press, in another form thereof, further comprises a pump for supplying a pressurized fluid flow and a fluid channel formed in the quill and adapted for coupling to the pump, the fluid channel being arranged at one section thereof for fluid communication with the first quill recess and being arranged at another section thereof for fluid communication with the second quill recess. The hydraulic piston means associated with each of the first and second brake assemblies further includes, in one form thereof, an annular seal member. The annular seal member defines with the quill an associated hydraulic pressurization chamber arranged for fluid communication with the pump via the fluid channel.




The invention, in another form thereof, is directed to a mechanical press comprising, in combination, a frame structure with a crown and a bed; a slide guided by the frame structure for reciprocating movement in opposed relation to the bed; a drive mechanism attached to the frame structure; a quill assembly having a quill non-rotationally connected to the press; a flywheel assembly rotatably driven by the drive mechanism, the flywheel assembly including a flywheel rotatable relative to the frame structure and axially mounted to the quill; a crankshaft rotatably disposed within the crown and in driving connection with the slide, the crankshaft selectively connectable with the flywheel for driving rotation thereby; the quill including a first recess formed therein and disposed adjacent the flywheel at one side thereof, the first quill recess defining a first chamber; the quill further including a second recess formed therein and disposed adjacent the flywheel at another side thereof, the second quill recess defining a second chamber; and a brake assembly for selectively applying a braking action to the flywheel. The brake assembly comprises, in combination, a first braking arrangement disposed at least in part within the first quill recess and a second braking arrangement disposed at least in part within the second quill recess. Each of the first and second braking arrangements comprises, in combination, a respective flywheel engaging member arranged in facing relationship with the flywheel at the respective side thereof and an associated hydraulic piston means for selectively reversibly moving the associated flywheel engaging member into braking engagement with the flywheel in response to the hydraulic activation thereof. A means is provided to supply fluid to at least one of the first quill recess and the second quill recess to enable hydraulic contact with the flywheel engaging member associated therewith.




The fluid supply means further comprises, in one form thereof, at least one bearing assembly disposed between the quill and the flywheel, the at least one bearing assembly comprising a hydrostatic bearing pad means arranged, at least in part, for fluid communication with each one of the first quill recess and the second quill recess; and a means for providing pressurized fluid to the hydrostatic bearing pad means. The hydrostatic bearing pad means includes, in one form thereof, a plurality of hydrostatic bearing pads formed in the quill and disposed in opposing facing relationship to a bushing connected to the flywheel and annularly disposed about the quill; wherein a clearance space defined between the plurality of hydrostatic bearing pads and the bushing is arranged for fluid communication with each one of the first quill recess and the second quill recess.




The mechanical press further includes, in one form thereof, a first means for providing pressurized hydraulic fluid to the respective hydraulic piston means associated with at least one of the first braking arrangement and the second braking arrangement. The first means further includes a pump for supplying a pressurized fluid flow; and a fluid channel formed in the quill and adapted for coupling to the pump, the fluid channel being arranged at one section thereof for fluid communication with the first quill recess and being arranged at another section thereof for fluid communication with the second quill recess. Each respective hydraulic piston means preferably includes an annular seal member that defines with the quill an associated pressurization chamber arranged for fluid communication with the pump via the fluid channel.




The invention, in another form thereof, relates to an assembly for use with a flywheel assembly of a press machine, the flywheel assembly including a flywheel rotatable relative to a frame structure of the press machine. The assembly comprises, in combination, a housing means for defining at least one brake housing space adjacent the flywheel at a respective side thereof; and a respective brake assembly disposed, at least in part, within each one of the at least one brake housing space defined by the housing means and being operative to selectively apply a braking action to the flywheel at the respective side thereof.




The assembly further comprises, in one form thereof, a means for providing fluid to each one of the at least one brake housing space defined by the housing means to enable hydraulic contact with the respective brake assembly disposed therein.




The assembly further includes, in another form thereof, a flywheel bearing assembly for supporting the flywheel, the flywheel bearing assembly comprising a hydrostatic bearing pad means arranged, at least in part, for fluid communication with each one of the at least one brake housing space defined by the housing means to enable hydraulic contact with the respective brake assembly disposed therein. Each one of the brake assemblies further includes, in one form thereof, a respective flywheel engagement means for making a selectively actuatable frictional connection with the flywheel at the respective side thereof; and an associated motion actuator means for selectively reversibly actuating the flywheel engagement means into making the frictional connection with the flywheel. The flywheel engagement means further includes a flywheel engaging member arranged in facing relationship with the flywheel at the respective side thereof, and the motion actuator means associated therewith further includes a respective hydraulic piston means for selectively reversibly moving the flywheel engaging member into braking engagement with the flywheel in response to the hydraulic activation thereof. The hydraulic piston means is preferably an annular seal member.




The housing means further comprises, in one form thereof, a quill assembly including a quill non-rotationally connected to the press machine, the flywheel being axially mounted to the quill. The quill includes a first recess formed therein and disposed adjacent the flywheel at one side thereof, the first quill recess having disposed therein a respective one of the brake assemblies. The quill further includes a second recess formed therein and disposed adjacent the flywheel at another side thereof, the second quill recess having disposed therein a respective another of the brake assemblies. A means is provided for supplying fluid to at least one of the first quill recess and the second quill recess to enable hydraulic contact with the respective brake assembly disposed therein.




The invention, in yet another form thereof, is directed to a system for use with a flywheel assembly of a press machine, the press machine including a quill assembly having a quill non-rotationally connected to the press machine, the flywheel assembly including a flywheel rotatable relative to a frame structure of the press machine and axially mounted to the quill. The system comprises, in combination, a first brake assembly disposed at least in part within a first brake housing space defined in the quill, the first brake housing space being disposed adjacent the flywheel at one side thereof, for selectively applying a braking action to the flywheel; and a second brake assembly disposed at least in part within a second brake housing space defined in the quill, the second brake housing space being disposed adjacent the flywheel at another side thereof, for selectively applying a braking action to the flywheel. The first brake assembly comprises, in combination, a respective flywheel engaging member arranged in facing relationship with the flywheel at the one side thereof, and an associated hydraulic piston means for selectively reversibly moving the flywheel engaging member into braking engagement with the flywheel in response to the hydraulic activation thereof. The second brake assembly comprises, in combination, a respective flywheel engaging member arranged in facing relationship with the flywheel at the another side thereof, and an associated hydraulic piston means for selectively reversibly moving the flywheel engaging member into braking engagement with the flywheel in response to the hydraulic activation thereof.




The system, in one form thereof, further includes a means for supplying fluid to the first brake housing space and the second brake housing space to enable hydraulic contact with the respective flywheel engaging member associated therewith.




The system, in another form thereof, further includes a flywheel bearing supporting the flywheel assembly, the flywheel bearing including at least one bearing assembly disposed between the quill and the flywheel; the at least one bearing assembly comprising a hydrostatic bearing pad means arranged, at least in part, for fluid communication with each one of the first brake housing space and the second brake housing space to enable hydraulic contact with the flywheel engaging member associated therewith. There is included a means for providing pressurized fluid to the hydrostatic bearing pad means.




The hydrostatic bearing pad means, in one form thereof, further include a plurality of hydrostatic bearing pads formed in the quill and disposed in opposing facing relationship to a bushing connected to the flywheel and annularly disposed about the quill. A clearance space defined.between the plurality of hydrostatic bearing pads and the bushing is arranged for fluid communication with each one of the first brake housing space and the second brake housing space.




The system further includes a first means for providing pressurized hydraulic fluid to the respective hydraulic piston means associated with each one of the first brake assembly and the second brake assembly. The first means further comprises a pump for supplying a pressurized fluid flow; and a fluid channel formed in the quill and adapted for coupling to the pump, the fluid channel being arranged at one section thereof for fluid communication with the first brake housing space and being arranged at another section thereof for fluid communication with the second brake housing space. Each respective hydraulic piston means further includes an annular seal member that defines with the quill and thrust retainer an associated hydraulic pressurization chamber arranged for fluid communication with the pump via the fluid channel.




An advantage of the present invention is that the flywheel brake assembly may be incorporated into a brake housing area defined in the quill assembly and flooded with fluid to provide a wet-type brake lining.




Another advantage of the present invention is that retrieving oil from the flywheel bearing assembly for use by the brake linings takes advantage of existing components and requires the addition of no significant parts.




A further advantage of the invention is that for an embodiment in which hydrostatic/hydrodynamic bearing pads formed in the quill are used, the existing oil film clearance that is defined between the bearing pads and the surrounding flywheel bushing may be the route by which oil supplied to the bearing pads can reach the brake linings in the brake housing areas.











BRIEF DESCRIPTION OF THE DRAWINGS




The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings, wherein:





FIG. 1

is a front elevational view of a press machine in one illustrative form thereof incorporating the wet-type flywheel brake system of the present invention; and





FIG. 2

is a fragmentary lateral cross-sectional view of an illustrative wet-type flywheel brake system according to one embodiment of the present invention.





FIG. 3

is a fragmentary lateral cross-sectional view of an illustrative wet-type flywheel brake system according to one embodiment of the present invention.





FIG. 4

is a fragmentary lateral cross-sectional view of an illustrative wet-type flywheel brake system according to one embodiment of the present invention.





FIG. 5

is a block diagram illustration of a hydraulic circuit according to one embodiment of the present invention.




Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification set out herein illustrates one preferred embodiment of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention in any manner.











DETAILED DESCRIPTION OF THE INVENTION




The wet-type flywheel brake system of the present invention may be installed within machines of the mechanical press type. Accordingly, reference is first made by way of background to

FIG. 1

, in which there is shown a mechanical press


10


of conventional form including a crown portion


12


, a bed portion


14


having a bolster assembly


16


connected thereto, and uprights


18


connecting crown portion


12


with bed portion


14


. Uprights


18


are connected to or integral with the underside of crown


12


and the upper side of bed


14


. A slide


20


is positioned between uprights


18


for controlled reciprocating movement between crown


12


and bed


14


. Tie rods (not shown), which extend through crown


12


, uprights


18


and bed portion


14


, are attached at each end with tie rod nuts


22


. Leg members


24


are formed as an extension of bed


14


and are generally mounted on shop floor


26


by means of shock absorbing pads


28


. A drive press motor


30


, which is part of the drive mechanism, is attached by means of a belt


32


to an auxiliary flywheel


34


attached to crown


12


. Auxiliary flywheel


34


is connected by means of a belt (not shown) to the main flywheel of the combination clutch/brake assembly, depicted generally at


36


. This form of the press machine is described for illustrative purposes only as it should be apparent to those skilled in the art that the principles of the present invention may be practiced with, and incorporated into, other machine configurations. Press machine


10


, when fully configured with a die assembly installed therein, further includes an upper die (not shown) generally located at area


38


and attached by known means in a conventional manner to the lower end of slide


20


. A lower die (not shown) located generally at area


40


is attached by known means in a conventional manner to the upper end of bolster


16


. The upper and lower dies, as so arranged in their opposing spaced-apart relationship, cooperate in a known manner during press operation to process a workpiece disposed therebetween, e.g., fastened to the lower die. The upper and lower dies together constitute a die set or assembly.




Referring now to

FIG. 2

, there is shown in fragmented view a lateral cross-section of a press machine of the type shown in

FIG. 1

to illustrate the integration of the wet-type flywheel brake system with the flywheel assembly, according to one embodiment of the present invention.

FIG. 2

illustrates in conventional form a flywheel assembly including a flywheel


50


with hub portion


52


rotatable about a quill assembly generally illustrated at


54


and comprising a quill


56


non-rotationally connected to the press machine, for example. Flywheel


50


is therefore rotatably supported by fixedly secured quill


56


. A crankshaft (not shown) rotates within quill


56


and is selectively connectable with flywheel


50


via a combination clutch/brake assembly of conventional form. A flywheel bearing assembly generally illustrated at


58


is preferably disposed between the rotatable flywheel assembly and the non-rotational quill assembly


54


to provide bearing support to flywheel


50


. The illustrated bearing assembly


58


includes, in one form, an annular bearing bushing


60


connected to flywheel


50


and interposed between flywheel hub


52


and quill


56


, and further includes an arrangement of hydrostatic/hydrodynamic bearing pads of the type disclosed in U.S. Pat. No. 5,556,207, which is assigned to the same assignee as the instant application and is hereby incorporated by reference herein. The bearing pads, in one form (not shown), are defined in a radially outward surface of quill


56


and open towards an inner bearing surface of flywheel bearing bushing


60


. Pressurized fluid is supplied to the hydrostatic bearing pads to generate a lubricating oil film between the quill and flywheel bushing that assists in providing bearing support to the flywheel. A hydrodynamic effect is developed as relative rotation occurs between the rotating flywheel bushing and the non-rotating quill. The illustrated quill assembly


54


further includes a thrust retainer


66


integrally attached to quill


56


and arranged in a conventional manner at the outboard side of flywheel


50


to inhibit axial movement of flywheel


50


. This configuration of press machine components is provided for illustrative purposes only and should not be considered in limitation of the present invention as it should be apparent to those skilled in the art that the wet-type flywheel brake system of the present invention can be integrated into various other such configurations and press machine types within the scope of the present invention.




Referring more particularly to

FIG. 2

, the wet-type flywheel brake system according to the present invention comprises a first brake assembly generally illustrated at


70


and a second brake assembly generally illustrated at


72


each disposed adjacent flywheel


50


at a respective side thereof and mounted within a respective brake housing area defined within quill assembly


54


. A first brake housing area shown generally at


74


is provided in the form of a recess formed in quill assembly


54


(i.e., thrust retainer


66


) and preferably extends annularly about an axis of rotation associated with the press machine. The illustrated first brake housing area


74


has an opening that is preferably arranged in immediately adjacent relationship with an outboard side of flywheel


50


and in facing opposition therewith. Likewise, a second brake housing area shown generally at


76


is provided in the form of a recess formed in quill assembly


54


(i.e., quill


56


) and preferably extends annularly about the axis of rotation associated with the press machine. The illustrated second brake housing area


76


has an opening that is preferably arranged in immediately adjacent relationship with an inboard side of flywheel


50


and in facing opposition therewith. These brake housing areas


74


and


76


are provided in a form that allows a substantial sealing thereof so that fluid admitted therein may be substantially contained therein. A drain (not shown) drains oil off to the press sump from brake housing area


76


.





FIG. 3

illustrates another embodiment of the present invention.

FIG. 3

illustrates in fragmented view a lateral cross-section of a press machine of the type shown in

FIG. 1

to illustrate the integration of the wet-type flywheel brake system with the flywheel assembly, according to one embodiment of the present invention.

FIG. 3

illustrates in conventional form a flywheel assembly including a flywheel


50


with hub portion


52


rotatable about a quill assembly generally illustrated at


54


and comprising a quill


56


non-rotationally connected to the press machine, for example. Flywheel


50


is therefore rotatably supported by fixedly secured quill


56


. A crankshaft (not shown) rotates within quill


56


and is selectively connectable with flywheel


50


via a combination clutch/brake assembly of conventional form. A flywheel bearing assembly generally illustrated at


58


is preferably disposed between the rotatable flywheel assembly and the non-rotational quill assembly


54


to provide bearing support to flywheel


50


. The illustrated bearing assembly


58


includes, in one form, an annular bearing bushing


60


connected to flywheel


50


and interposed between flywheel hub


52


and quill


56


, and may include an arrangement of hydrostatic/hydrodynamic bearing pads


220


of the type disclosed in U.S. Pat. No. 5,556,207, which is assigned to the same assignee as the instant application and is hereby incorporated by reference herein. The bearing pads, in one form, may be defined in a radially outward surface of quill


56


and open towards an inner bearing surface of flywheel bearing bushing


60


. Pressurized fluid is supplied to the hydrostatic bearing pads to generate a lubricating oil film between the quill and flywheel bushing that assists in providing bearing support to the flywheel. A hydrodynamic effect is developed as relative rotation occurs between the rotating flywheel bushing and the non-rotating quill. The illustrated quill assembly


54


further includes a thrust retainer


66


integrally attached to quill


56


and arranged in a conventional manner at the outboard side of flywheel


50


to inhibit axial movement of flywheel


50


. This configuration of press machine components is provided for illustrative purposes only and should not be considered in limitation of the present invention as it should be apparent to those skilled in the art that the wet-type flywheel brake system of the present invention can be integrated into various other such configurations and press machine types within the scope of the present invention.





FIG. 3

illustrates an embodiment of the present invention wherein the wet-type flywheel brake system comprises a single brake assembly generally illustrated at


200


and disposed adjacent flywheel


50


at a side thereof and mounted within a single brake housing area


202


defined within quill assembly


54


. The single brake housing area shown generally at


202


is provided in the form of a recess formed in quill assembly


54


(i.e., quill


56


) and preferably extends annularly about an axis of rotation associated with the press machine. The illustrated single brake housing area


202


has an opening that is preferably arranged in immediately adjacent relationship with a side of flywheel


50


and in facing opposition therewith. The single brake housing area


202


is provided in a form that allows a substantial sealing thereof so that fluid admitted therein may be substantially contained therein. A drain (not shown) drains oil off to the press sump from brake housing area


76


.




Referring to

FIG. 2

, the illustrated first and second brake assemblies


70


and


72


are respectively mounted within first brake housing area


74


and second brake housing area


76


in accordance with one aspect of the present invention. Referring to

FIG. 3

, single brake assembly


200


is mounted within single brake housing


202


. As will be discussed below in further detail, each of the brake assemblies


70


,


72


and


200


is preferably provided in the form of a hydraulically-activatable braking device that operates to selectively apply a braking action to flywheel


50


by developing a frictional contacting engagement with a respective surface of flywheel


50


. For this purpose, each of the brake assemblies


70


,


72


and


200


is provided with a flywheel engaging member in the form of a conventional wet-type brake lining element that is selectively movable into engagement with flywheel


50


utilizing a hydraulic motion actuator preferably provided in the form of a piston-type device. However, this particular arrangement of braking components is provided for illustrative purposes only and should not be considered in limitation of the present invention as it should be apparent that the functions relating to the application of a braking influence and the actuation of such braking engagement may be implemented by other arrangements within the scope of the present invention.





FIG. 4

illustrates another embodiment of the present invention wherein multiple disk brake assembly


300


is mounted within multiple discs brake housing area


302


in accordance with one aspect of the present invention. Multiple disc brake assembly


302


is preferably provided in the form of a hydraulically-activatable braking device that operates to selectively apply a braking action to flywheel


50


. For this purpose, brake assembly


302


is provided with a flywheel engaging member in the form of a multiple disk brake lining element


304


that is selectively moveable into engagement with flywheel


50


utilizing a hydraulic motion actuator preferably provided in the form of a piston-type device.




In accordance with another aspect of the present invention discussed below in further detail, brake housing areas


74


,


76


,


202


and


300


is preferably arranged to allow hydraulic fluid to be admitted therein for the purposes of enabling a hydraulic contact to develop with at least the brake lining element. For purposes herein, the enablement of a hydraulic contact should be considered as encompassing any form of contact by, interaction with, or exposure to hydraulic fluid that is experienced by at least the brake lining element, regardless of the duration of contact (i.e., not limited to a transient or continuous exposure to hydraulic fluid). For example, enabling such hydraulic contact includes, but is not limited to, creating a partial immersion of the brake lining element or associated brake assembly, creating a total immersion of the brake lining element or associated brake assembly (i.e., filling the entire brake housing area associated therewith to the extent possible), creating a variable fluid flow (at various flooding levels) through the associated brake housing area, and creating a rapid fluid flow (at various flooding levels) through the associated brake housing area to maintain an efficient cooling operation. Additionally, this wet-type feature for the flywheel brake assembly may be controlled and is preferably maintained to be continuously active, particularly during flywheel braking activity.




In accordance with another aspect of the present invention, the hydraulic fluid that is admitted into the brake housing areas


74


,


76


,


202


and


300


is communicated from the flywheel bearing assembly


58


. For this purpose, adaptations/modifications may be made to ensure that a path of fluid communication exists between the bearing arrangement and the brake housing areas. However, this mode and manner of obtaining oil from the neighboring flywheel bearing assembly


58


should not be considered in limitation of the present invention as it should be apparent that other means may be used to provide fluid to the brake assemblies


70


and


72


mounted respectively in brake housing areas


74


and


76


.




Referring to

FIG. 2

, and specifically to the illustrated first brake assembly


70


disposed at the outboard side of flywheel


50


within first brake housing area


74


, the illustrated first brake housing area


74


includes an annular-shaped piston chamber illustrated at


78


and which extends generally in the axial direction, and further includes an annular-shaped brake chamber illustrated at


80


and which extends generally in the radial direction. First brake assembly


70


comprises, in one form thereof, a piston device provided in the form of an annular-shaped seal member


82


that is disposed within piston chamber


78


and which is operatively reversibly axially movable in response to the pressure condition of a hydraulic pressurization region


84


defined between seal-type piston


82


and thrust retainer


66


. First brake assembly


70


further comprises a brake device provided in the form of a facing brake element or lining


86


attached to a brake backing or support plate


88


that, in combination, is integrally disposed within brake chamber


80


at a forward end thereof adjacent the opening of the associated first brake housing area


74


so as to be arranged in opposed facing relationship to a side surface of flywheel hub


52


. The combination brake lining


86


and brake plate


88


is reversibly axially displaceable into a selective one of engagement and non-engagement with flywheel hub


52


at brake lining


86


, as controlled by the actuating function of seal-type piston


82


. The illustrated form and structure of first brake housing area


74


, and particularly piston chamber


78


and brake chamber


80


, should not be considered in limitation of the present invention as it should be apparent that various other designs are possible consistent with their ability to accommodate the placement therein of the selected brake assembly components. For example, the quill recess areas and seal-type pistons are preferably annular but may be fragmented or provided in other shapes and arrangements.




The illustrated brake lining


86


may be provided in the form of a single annular-shaped piece or alternately as a plurality of discrete brake lining segments arranged in a ring-type configuration about brake plate


88


. The illustrated brake plate


88


is coupled at its radially outer end to a flange portion


90


of thrust retainer


66


in any conventional manner that accommodates axial movement of the integral brake plate


88


and brake lining


86


. For example, brake plate


88


may be provided at its outer periphery with an arrangement of teeth that meshingly engage with a complementary arrangement of teeth provided at an inner periphery of thrust retainer flange portion


90


. Brake plate


88


and brake lining


86


may be structured and dimensioned so as to optimize their frictional capabilities with a view towards optimally minimizing the time of frictional engagement needed to stop flywheel


50


. Another related consideration involves proper management of the hydraulic pressurizing force that actuates the brake clamping condition, with a typical pressure level of


1000


psi for stopping flywheel rotation in a few seconds.




Briefly, in operation, piston pressurization region


84


is sufficiently pressurized by hydraulic fluid admitted therein via fluid supply line


92


illustratively formed in both quill


56


and thrust retainer


66


in the manner shown. A source of pressurized fluid (not shown) is coupled to fluid supply line


92


at its inlet end


94


. This pressurization firstly induces seal-type piston


82


into actuating engagement with brake plate


88


(if these components are non-actuatively spaced-apart) and then causes the integral brake plate


88


and brake lining


86


to move axially inwardly in a sufficient manner towards flywheel


50


such that brake lining


86


comes into frictional surface-to-surface contacting engagement or connection with flywheel hub


52


to thereby effect a braking action. This braking action may be removed by evacuating hydraulic fluid from pressurization region


84


, thereby axially withdrawing piston


82


from its brake-actuating position and causing the integral brake plate


88


and brake lining


86


to become similarly non-engaged with respect to flywheel


50


. There may be provided some form of biasing device or return mechanism that forces the integral brake plate


88


and brake lining


86


back into their original positions of non-engagement with respect to flywheel


50


when the brake-activating influence provided by seal-type piston


82


is removed via de-pressurization of pressurization region


84


. In their non-actuated state, piston


82


and the integral brake plate


88


and brake lining


86


are preferably arranged in spaced-apart relationship sufficient to be closed out via activation of piston device


82


. Alternatively, piston


82


may be coupled to the integral brake lining


86


and brake plate


88


such that any movements of piston


82


produce corresponding displacements of integral brake lining


86


and brake plate


88


.




Referring now to the illustrated second brake assembly


72


disposed at the inboard side of flywheel


50


within second brake housing area


76


, quill


56


is preferably modified from its conventional form to have defined therein the illustrated second brake housing area


76


that is formed in a manner similar to first brake housing area


74


because it houses a similar arrangement of components as first brake assembly


70


. More specifically, the illustrated second brake assembly


72


includes, in combination, a seal-type piston


96


and an integral brake lining


98


and brake plate


100


that is formed and arranged within its respective second brake housing area


76


in a manner and configuration respectively similar to piston


82


, brake lining


86


, and brake plate


88


of first brake assembly


70


. Accordingly, for purposes of brevity, the discussion above pertaining to the general configuration and operation of first brake assembly


70


is applicable in its essential aspects to an understanding of second brake assembly


72


. The illustrated second brake housing area


76


is preferably defined at its upper end by a seal housing


102


that is integrally attached to quill


56


and which forms part of quill assembly


54


. Seal housing


102


is preferably provided with an arrangement of inner-facing teeth at an edge portion thereof for coupled meshing engagement with a complementary arrangement of teeth provided at a peripheral edge of brake plate


100


.




Briefly, in operation, pressurization region


104


defined adjacent seal-type piston


96


of second brake assembly


72


is sufficiently hydraulically pressurized via fluid supply line


92


, which is adapted for fluid communication with pressurization region


104


. Accordingly, the set of piston pressurization regions


84


and


104


associated respectively with the outboard and inboard flywheel brake assemblies


70


and


72


can be simultaneously pressurized to effect a coordinated and stable braking action taking place at both sides of flywheel


50


. Adequate pressurization of pressurization region


104


will cause seal-type piston


96


to be brought into engagement with brake plate


100


at a backside thereof, which actuates movement of the integral brake lining


98


and brake plate


100


towards flywheel hub


52


until braking engagement is achieved between brake lining


98


and an opposing contact surface of flywheel hub


52


.




In accordance with a preferred aspect of the present invention aimed at making each of the brake assemblies


70


and


72


a wet-type braking apparatus, each one of the combination brake lining


86


/brake plate


88


of first brake assembly


70


and combination brake lining


98


/brake plate


100


of second brake assembly


72


is fully immersed in oil by suitably forming and arranging the illustrated flywheel bearing assembly


58


such that fluid communication is established between bearing assembly


58


and first and second brake housing areas


74


and


76


, respectively. As shown, for example, the axial extent of bearing drain area


62


overlaps with an axial dimension of first brake housing area


74


proximate the lower end of the integral brake lining


86


and brake plate


88


. Accordingly, brake housing area


74


is disposed in fluid communication with flywheel bearing assembly


58


at bearing drain area


62


such that fluid admitted into bearing drain area


62


may flow to brake housing area


74


for preferably immersing at least brake lining


86


. Bearing drain area


62


is supplied with fluid exiting bearing


60


. Oil which has had hydraulic contact with brake lining


86


and brake plate


88


passes by centrifugal force to drain line


106


, formed in flywheel hub


52


to be conducted to second brake housing area


76


so as to be drained away at a location (not shown) to the press sump (not shown). Oil which has had hydraulic contact with brake lining


98


and brake plate


100


similarly passes into second brake housing area


76


to be drained away in the same manner.




In similar fashion, the axial extent of bearing drain area


64


overlaps with an axial dimension of second brake housing area


76


proximate the lower end of the combination brake lining


98


and brake plate


100


. Accordingly, brake housing area


76


is disposed in fluid communication with flywheel bearing assembly


58


at bearing drain area


64


such that fluid admitted into bearing drain area


64


may flow to brake housing area


76


for preferably immersing at least brake lining


98


. Bearing drain area


64


is preferably supplied with fluid exiting bearing


60


.




Although, as depicted in the drawings, the oil for immersing the brake components is drawn from the hydrostatic/hydrodynamic bearing pads, this should not be considered in limitation of the present invention as it is possible for other suitable arrangements such as hydrodynamic-only bushings or anti-friction -type ball or roller bearings to likewise convey fluid to the brake housing areas. Additionally, other bearing pad arrangements may be used, most notably the pad arrangement disclosed in the aforementioned U.S. Pat. No. 5,556,207 in which the bearing pads are formed in the quill and open towards the flywheel bronze bushing disposed thereabout with a clearance therebetween. With such a quill configuration implemented as part of the flywheel bearing assembly


58


, fluid communication could be established between the quill-formed bearing pads and the brake housing areas via suitable formation of the running clearance, which is sustained by the continuously present lubricating oil film existing between the pads and bushing.




Relative-motion-type seals


108


and


110


are provided in attachment to flywheel hub


52


. Any oil escaping past these seals


108


and


110


may be collected and recovered through the use of a vacuum drain passage


112


provided in flywheel hub


52


in the illustrated manner, in which its outboard end lies proximate a cover plate


114


that conventionally forms an end piece for the press machine rotary assembly. Such a fluid control system is disclosed in U.S. Pat. No. 5,628,248, which is assigned to the same assignee as the instant application and is hereby incorporated by reference herein.




A hydraulic pump that generates a high-pressure fluid flow and which operates independently of the power source for the mechanical press is preferably coupled to inlet


94


of fluid supply line


92


. This operational independence allows the brake linings


86


and


98


to be clamped to flywheel


50


even in the event that the main power to the mechanical press is interrupted.





FIG. 5

illustrates an example hydraulic circuit for use with the wet-type flywheel brake. Piston-type accumulator


402


maintains an output of preferably 1000 psi. Pressure switch


404


provides an indication that the hydraulic circuit is pressurized and the press may be operated. Relief valve


406


is provided and preferably provides pressure relief when a pressure greater than or equal to


1200


psi is achieved in the hydraulic circuit. Valve


412


allows pump


410


to provide additional fluid pressure to hydraulic circuit


420


. Motor


408


operates pump


410


. Valve


400


is provided and allows hydraulic pressure to be introduced to the braking system


430


.




According to the present invention there is disclosed a flywheel brake system that features the formation of respective brake housing areas in a quill assembly for containing the inboard and outboard brake assemblies each disposed in adjacent facing opposition with respect to a respective side surface of the flywheel hub. Hydraulic fluid is provided to these brake housing areas, preferably by way of suitable modifications/adaptations to the flywheel bearing system, in order to immerse the brake linings so as to achieve a measure of heat transfer and lubrication not otherwise available in conventional apparatus. This brake system provides a wet-type brake design that remains fully and continuously lubricated so as to provide an ongoing level of heat transfer that moves thermal energy away from the brake linings and brake plates, particularly during a braking operation when heat buildup occurs rapidly due to the contact-type frictional energy that is produced. The reduction of heat buildup and the lubrication combine to reduce friction lining wear to a minimum thus greatly extending flywheel brake facing life.




While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.



Claims
  • 1. An assembly for use with a flywheel assembly of a press machine, said flywheel assembly including a flywheel rotatable relative to a frame structure of said press machine, said assembly comprising:housing means for defining at least one brake housing space adjacent said flywheel at a respective side thereof; and at least one brake assembly, each brake assembly being disposed, at least in part, within a respective one of said at least one brake housing space defined by said housing means and being operative to selectively apply a braking action to said flywheel at the respective side thereof, said each brake assembly having a respective flywheel engaging member arranged in facing relationship with said flywheel at the respective side thereof, and an associated hydraulic piston means for selectively reversibly moving said flywheel engaging member into braking engagement with said flywheel in response to the hydraulic activation thereof.
  • 2. The assembly as recited in claim 1, further comprises:means for providing fluid into each one of said at least one brake housing space defined by said housing means to enable hydraulic contact with said respective brake assembly disposed therein.
  • 3. The assembly as recited in claim 1, further comprises:a flywheel bearing assembly for supporting said flywheel, said flywheel bearing assembly arranged, at least in part, for fluid communication with each one of said at least one brake housing space defined by said housing means to enable hydraulic contact with said respective brake assembly disposed therein.
  • 4. An assembly for use with a flywheel of a press machine, comprising:a housing means for defining at least one brake housing space adjacent said flywheel at a respective side thereof; at least one brake assembly, each brake assembly being disposed, at least in part, within a respective one of said at least one brake housing space defined by said housing means and being operative to selectively apply a braking action to said flywheel at the respective side thereof; a quill assembly including a quill non-rotationally connected to said press machine, said flywheel being axially mounted to said quill; said quill including a first recess formed therein and disposed adjacent said flywheel at one said thereof, said first quill recess having disposed therein a respective brake assembly; and said quill further including a second recess formed therein and disposed adjacent said flywheel at another side thereof, said second quill recess having disposed therein a respective brake assembly.
  • 5. The assembly as recited in claim 4, further comprises:means for supplying fluid into at least one of said first quill recess and said second quill recess to enable hydraulic contact with said respective brake assembly disposed therein.
  • 6. The assembly as recited in claims 4, further comprises:a flywheel bearing supporting said flywheel assembly; said flywheel bearing including at least one bearing assembly disposed between said quill and said flywheel, said at least one bearing assembly arranged, at least in part, for fluid communication with each one of said first quill recess and said second quill recess to enable hydraulic contact with the respective brake assembly associated therewith; and means for providing pressurized fluid to said at least one bearing assembly.
  • 7. The assembly as recited in claim 6, wherein said at least one bearing assembly comprises:a plurality of hydrostatic bearing pads formed in said quill and disposed in opposing facing relationship to a bushing connected to said flywheel and annularly disposed about said quill; wherein a clearance space defined between said plurality of hydrostatic bearing pads and said bushing is arranged for fluid communication with each one of said first quill recess and said second quill recess.
  • 8. The assembly as recited in claim 4, wherein the respective brake assembly associated with each one of said first quill recess and said second quill recess further comprises:a respective flywheel engaging member arranged in facing relationship with said flywheel at the respective side thereof; and an associated hydraulic piston means for selectively reversibly moving said flywheel engaging member into braking engagement with said flywheel in response to the hydraulic activation thereof.
  • 9. The assembly as recited in claim 8, further comprises:a flywheel bearing supporting said flywheel assembly, said flywheel bearing including at least one bearing assembly disposed between said quill and said flywheel; said at least one bearing assembly arranged, at least in part, for fluid communication with each one of said first quill recess and said second quill recess to enable hydraulic contact with said flywheel engaging member associated therewith; and means for providing pressurized fluid to said at least one bearing assembly.
  • 10. The assembly as recited in claim 8, wherein the respective hydraulic piston means associated with said respective brake assembly associated with each one of said first quill recess and said second quill recess further comprises:an annular seal member; wherein said annular seal member defines with said quill an associated hydraulic pressurization chamber.
  • 11. The assembly as recited in claim 10, further comprises:a pump for supplying a pressurized fluid flow; and a fluid channel formed in said quill and adapted for coupling to said pump, said fluid channel being arranged at one section thereof for fluid communication with the hydraulic pressurization chamber associated with said first quill recess and being arranged at another section thereof for fluid communication with the hydraulic pressurization chamber associated with said second quill recess.
  • 12. The assembly as recited in claim 1, wherein the respective brake assembly associated with each one of said at least one brake housing space defined by said housing means further comprises:a respective flywheel engagement means for making a selectively actuatable frictional connection with said flywheel at the respective side thereof; and an associated motion actuator means for selectively reversibly actuating said flywheel engagement means into making the frictional connection with said flywheel.
  • 13. The assembly as recited in claim 12, further comprises:means for providing fluid into each one of said at least one brake housing space defined by said housing means to enable hydraulic contact with said respective flywheel engagement means disposed therein.
  • 14. A system for use with a flywheel assembly of a press machine, said press machine including a quill assembly having a quill non-rotationally connected to said press machine, said flywheel assembly including a flywheel rotatable relative to a frame structure of said press machine and axially mounted to said quill, said system comprising:a first brake assembly disposed at least in part within a first brake housing space defined in said quill, said first brake housing space being disposed adjacent said flywheel at a first side thereof, for selectively applying a braking action to said flywheel; said first brake assembly comprising: a respective flywheel engaging member arranged in facing relationship with said flywheel at the first side thereof, and an associated hydraulic piston means for selectively reversibly moving said flywheel engaging member into braking engagement with said flywheel in response to the hydraulic activation thereof; and a second brake assembly disposed at least in part within a second brake housing space defined in said quill, said second brake housing space being disposed adjacent said flywheel at a second side thereof, for selectively applying a braking action to said flywheel; said second brake assembly comprising: a respective flywheel engaging member arranged in facing relationship with said flywheel at the second side thereof, and an associated hydraulic piston means for selectively reversibly moving said flywheel engaging member into braking engagement with said flywheel in response to the hydraulic activation thereof.
  • 15. The system as recited in claim 14, further comprises:means for supplying fluid into said first brake housing space and said second brake housing space to enable hydraulic contact with said respective flywheel engaging member associated therewith.
  • 16. The system as recited in claim 14, further comprises:a flywheel bearing supporting said flywheel assembly, said flywheel bearing including at least one bearing assembly disposed between said quill and said flywheel; said at least one bearing assembly arranged, at least in part, for fluid communication with each one of said first brake housing space and said second brake housing space to enable hydraulic contact with said flywheel engaging member associated therewith; and means for providing pressurized fluid to said at least one bearing assembly.
  • 17. The system as recited in claim 16, wherein said at least one bearing assembly comprises:a plurality of hydrostatic bearing pads formed in said quill and disposed in opposing facing relationship to a bushing connected to said flywheel and annularly disposed about said quill; wherein a clearance space defined between said plurality of hydrostatic bearing pads and said bushing is arranged for fluid communication with each one of said first brake housing space and said second brake housing space.
  • 18. The system as recited in claim 16, wherein said at least one bearing assembly comprises:a plurality of hydrostatic bearing pad areas defined between said quill and said flywheel and arranged axially adjacent a bushing connected to said flywheel and annularly disposed about said quill; wherein at least one of said plurality of hydrostatic bearing pad areas is arranged, at least in part, for fluid communication with at least one of said first brake housing space and said second brake housing space.
  • 19. The system as recited in claim 14, further comprises:first means for providing pressurized hydraulic fluid to the respective hydraulic piston means associated with each one of said first brake assembly and said second brake assembly.
  • 20. The system as recited in claim 19, wherein said first means further comprises:a pump for supplying a pressurized fluid flow; and a fluid channel formed in said quill and adapted for coupling to said pump, said fluid channel being arranged at one section thereof for fluid communication with said first brake housing space and being arranged at another section thereof for fluid communication with said second brake housing space.
  • 21. The system as recited in claim 20, wherein the respective hydraulic piston means associated with each of said first brake assembly and said second brake assembly further comprises:an annular seal member.
  • 22. The system as recited in claim 21, wherein the respective annular seal member associated with each of said first brake assembly and said second brake assembly defines with said quill an associated hydraulic pressurization chamber arranged for fluid communication with said pump via said fluid channel.
  • 23. The system as recited in claim 22, further comprises:a flywheel bearing supporting sail flywheel assembly, said flywheel bearing including at least on bearing assembly disposed between said quill and said flywheel; said at least one bearing assembly comprising a hydrostatic bearing pad means arranged, at least in part, for fluid communication with each one of said first brake housing space and said second brake housing space to enable hydraulic contact with said flywheel engaging member associated therewith; and means for providing pressurized fluid to said hydrostatic bearing pad means.
Parent Case Info

This is a divisional of patent application Ser. No. 09/305,429 filed on May 5, 1999, now U.S. Pat. No. 6,123,019 the closure of which is herein explicitly incorporated by reference.

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