Drive sheave of elevator

Information

  • Patent Grant
  • 6755393
  • Patent Number
    6,755,393
  • Date Filed
    Monday, September 23, 2002
    22 years ago
  • Date Issued
    Tuesday, June 29, 2004
    20 years ago
Abstract
In an elevator drive sheave, positioning of divided segments in a circumferential direction relative to a sheave body and transmission of torque between the sheave body and the divided segments are performed by a torque transmission mechanism having a plurality of keys interposed between the sheave body and the divided segments. A projecting portion projecting radially inward is disposed on an axial end portion of the divided segments, a contact surface being disposed on the projecting portions. Positioning of the divided segments in an axial direction relative to the sheave body is performed by the contact surface being placed in contact with an axial end surface of the sheave body.
Description




TECHNICAL FIELD




The present invention relates to an elevator drive sheave disposed on a hoisting machine onto which a main rope for suspending a car is wound, the elevator drive sheave being rotated by a driving force from a motor portion of the hoisting machine.




BACKGROUND ART





FIG. 10

is a side elevation showing a conventional elevator hoisting machine such as shown in Japanese Utility Model Publication No. SHO 59-12444, for example, partially sectioned. The elevator hoisting machine in the figure includes: a motor portion


1


; a rotating shaft


2


rotated by this motor portion


1


; a bearing portion


3


for supporting the rotating shaft


2


; a drive sheave


4


rotated together with the rotating shaft


2


; and an electromagnetic brake


5


for braking rotation of the drive sheave


4


.




The drive sheave


4


includes: a rope groove portion


4




a


onto which a main rope (not shown) is wound; and a brake drum portion


4




b


braked by the electromagnetic brake


5


.




In a conventional elevator hoisting machine such as described above, it has been necessary to perform correction work on the rope groove portion


4




a


since the rope groove portion


4




a


is abraded by friction with the main rope. It has been necessary to perform correction work on the rope groove portion


4




a


particularly frequently when the drive sheave


4


is disposed outdoors due to the effects of weather and dust.




Since correction work of this kind is performed by removing the entire drive sheave


4


from the hoisting machine, a great deal of time and cost have been required, and operating efficiency of such elevators has also been reduced.




In regard to this,

FIG. 11

is a front elevation showing part of another example of a conventional drive sheave, and

FIG. 12

is a cross section taken along line XII—XII in FIG.


11


.




The drive sheave in the figures includes a sheave body


6


and a plurality of divided segments


7


. A brake drum portion


6




a


is disposed on the sheave body


6


. A rope groove portion


7




a


is disposed on the divided segments


7


. The divided segments


7


are fixed to the sheave body


6


by a plurality of radial bolts


8


and a plurality of axial bolts


9


.




Using a drive sheave of this kind, since it is sufficient simply to remove the divided segments


7


from the sheave body


6


when performing correction work on the rope groove portion


7




a


without removing the sheave body


6


from the rotating shaft, the correction work can be performed easily in a short period of time, enabling costs to be reduced and also enabling reductions in the operating efficiency of the elevator to be prevented.




However, in a conventional drive sheave of this kind, parts construction is complicated because of transmission of torque between the divided segments


7


and the sheave body


6


, positioning of the divided segments


7


in an axial direction, etc., and complicated machining has been required on the parts, increasing costs.




DISCLOSURE OF THE INVENTION




The present invention aims to solve the above problems and an object of the present invention is to provide an elevator drive sheave enabling correction work on a rope groove portion to be performed easily and enabling costs to be reduced by a simple construction.




According to one aspect of the present invention, there is provided an elevator drive sheave disposed on a hoisting machine onto which a main rope for suspending a car is wound, the elevator drive sheave being rotated by a driving force from a motor portion of the hoisting machine, wherein the elevator drive sheave includes: a sheave body having a cylindrical main body outer circumferential surface; a plurality of divided segments divided in a circumferential direction of the sheave body, each mounted to the main body outer circumferential surface and formed with a rope groove portion into which the main rope is inserted; and a torque transmission mechanism in which a plurality of keys are interposed between the sheave body and the divided segments for positioning the divided segments in a circumferential direction relative to the sheave body and transmitting torque between the sheave body and the divided segments, a contact surface being disposed on the divided segments for positioning the divided segments in an axial direction relative to the sheave body by being placed in contact with an axial end surface of the sheave body.











BRIEF DESCRIPTION OF THE DRAWINGS





FIG. 1

is a front elevation showing part of an elevator drive sheave according to Embodiment 1 of the present invention;





FIG. 2

is a cross section taken along line II—II in

FIG. 1

;





FIG. 3

is a cross section taken along line III—III in

FIG. 1

;





FIG. 4

is a front elevation showing part of an elevator drive sheave according to Embodiment 2 of the present invention;





FIG. 5

is a cross section taken along line V—V in

FIG. 4

;





FIG. 6

is a cross section taken along line VI—VI in

FIG. 4

;





FIG. 7

is a front elevation showing part of an elevator drive sheave according to Embodiment 3 of the present invention;





FIG. 8

is a cross section taken along line VIII—VIII in

FIG. 7

;





FIG. 9

is a cross section taken along line IX—IX in

FIG. 7

;





FIG. 10

is a side elevation showing an example of a conventional elevator hoisting machine partially sectioned;





FIG. 11

is a front elevation showing part of another example of a conventional drive sheave; and





FIG. 12

is a cross section taken along line XII—XII in FIG.


11


.











BEST MODE FOR CARRYING OUT THE INVENTION




Preferred embodiments of the present invention will now be explained with reference to the drawings.




Embodiment 1





FIG. 1

is a front elevation showing part of an elevator drive sheave according to Embodiment 1 of the present invention,

FIG. 2

is a cross section taken along line II—II in

FIG. 1

, and

FIG. 3

is a cross section taken along line III—III in FIG.


1


.




The drive sheave in the figures includes: a sheave body


11


; and a plurality of arc-shaped divided segments


12


divided in a circumferential direction of the sheave body


11


. The sheave body


11


includes: a cylindrical main body outer circumferential surface


11




a


; and a brake drum portion


11




b.






A rope groove portion


12




a


into which a main rope (not shown) is inserted is disposed on the divided segments


12


. The divided segments


12


are fixed to the main body outer circumferential surface


11




a


of the sheave body


11


by means of a plurality of radial bolts


13


and


14


extending in a radial direction of the sheave body


11


and a plurality of axial bolts


15


extending in an axial direction of the sheave body


11


.




Diameters of apertures in the divided segments


21


through which the radial bolts


13


and


14


and the axial bolts


15


pass have clearance relative to the diameter of the corresponding bolts


13


,


14


, and


15


.




Projecting portions


12




b


projecting radially inward are disposed on axial end portions of the divided segments


12


. Contact surfaces


12




c


for positioning the divided segments


12


in an axial direction relative to the sheave body


11


by being placed in contact with an axial end surface


11




c


of the sheave body


11


are disposed on the projecting portions


12




b


. When the contact surfaces


12




c


are placed in contact with the end surface


11




c


, there is a gap t between the divided segments


12


and the brake drum portion


11




b.






Keyways


11




d


and


12




d


are disposed on the sheave body


11


and the divided segments


12


, respectively. A key


16


is inserted into the key ways


11




d


and


12




d


. A torque transmission mechanism


17


includes the keyways


11




d


and


12




d


and the key


16


. The torque transmission mechanism


17


positions the divided segments


12


in a circumferential direction relative to the sheave body


11


and transmits torque between the sheave body


11


and the divided segments


12


.




Using a drive sheave of this kind, correction work on the rope groove portion


12




a


and replacement of the divided segments


12


can be performed easily by removing the divided segments


12


from the sheave body


11


, enabling costs for maintenance to be reduced and also enabling reductions in the operating efficiency of the elevator to be prevented.




Furthermore, positioning of the divided segments


12


in the axial direction can be performed easily, simply by placing the contact surfaces


12




c


in contact with the end surface


11




c


, also enabling mutual positioning of the rope groove portions


12




a


to be performed easily.




In addition, since the transmission of torque is performed mainly by the key


16


, it is sufficient for the bolts


13


,


14


, and


15


simply to secure the divided segments


12


to the sheave body


11


, enabling dimensions of the bolts


13


,


14


, and


15


to be reduced.




Embodiment 2




Next,

FIG. 4

is a front elevation showing part of an elevator drive sheave according to Embodiment 2 of the present invention,

FIG. 5

is a cross section taken along line V—V in

FIG. 4

, and

FIG. 6

is a cross section taken along line VI—VI in FIG.


4


.




The drive sheave in the figures includes: a sheave body


11


; and a plurality of arc-shaped divided segments


21


divided in a circumferential direction of the sheave body


11


. The sheave body


11


includes: a cylindrical main body outer circumferential surface


11




a


; and a brake drum portion


11




b.






A rope groove portion


21




a


into which a main rope (not shown) is inserted is disposed on the divided segments


21


. The divided segments


21


are fixed to the main body outer circumferential surface


11




a


of the sheave body


11


by means of a plurality of radial bolts


13


and


14


extending in radial directions of the sheave body


11


. Diameters of apertures in the divided segments


21


through which the radial bolts


13


and


14


pass have clearance relative to the diameter of the radial bolts


13


and


14


.




A plurality of linking members


22


also functioning as positioning members are fixed to axial end portions of the divided segments


21


. The linking members


22


are fixed to divided segments


21


that are adjacent to each other by mounting bolts


23


, linking the divided segments


21


that are adjacent to each other.




Contact surfaces


22




a


for positioning the divided segments


21


in an axial direction relative to the sheave body


11


by being placed in contact with an axial end surface


11




c


of the sheave body


11


are disposed on the linking members


22


. When the contact surfaces


22




a


are placed in contact with the end surface


11




c


, there is a gap t between the divided segments


21


and the brake drum portion


11




b.






The linking members


22


are fixed to the sheave body


11


by a plurality of axial bolts


15


extending in the axial direction of the sheave body


11


. Diameters of apertures in the linking members


22


through which the axial bolts


15


pass have clearance relative to the diameter of the axial bolts


15


.




Keyways


11




d


and


21




b


are respectively disposed on the sheave body


11


and the divided segments


21


. A key


16


is inserted into the keyways


11




d


and


21




b


. A torque transmission mechanism


24


includes the keyways


11




d


and


21




b


and the key


16


. The torque transmission mechanism


24


positions the divided segments


21


in a circumferential direction relative to the sheave body


11


and transmits torque between the sheave body


11


and the divided segments


21


.




Using a drive sheave of this kind, correction work on the rope groove portion


21




a


and replacement of the divided segments


21


can be performed easily by removing the divided segments


21


from the sheave body


11


, enabling costs for maintenance to be reduced and also enabling reductions in the operating efficiency of the elevator to be prevented.




Furthermore, positioning of the divided segments


21


in the axial direction can be performed easily, simply by mounting the linking members


22


to the divided segments


21


and placing the contact surfaces


22




a


in contact with the end surface


11




c


, also enabling mutual positioning of the rope groove portions


21




a


to be performed easily.




In addition, since the transmission of torque is performed mainly by the key


16


, it is sufficient for the bolts


13


,


14


, and


15


simply to secure the divided segments


21


and the linking members


22


to the sheave body


11


, enabling dimensions of the bolts


13


,


14


, and


15


to be reduced.




Still furthermore, because the linking members


22


for positioning the divided segments


21


in the axial direction are made as separate bodies from the divided segments


21


, the shapes of the divided segments


21


are simplified, simplifying machining of the divided segments


21


and enabling the cost of parts to be reduced. Furthermore, the weight of the divided segments


21


is reduced, facilitating handling.




Embodiment 3




Next,

FIG. 7

is a front elevation showing part of an elevator drive sheave according to Embodiment 3 of the present invention,

FIG. 8

is a cross section taken along line VIII—VIII in

FIG. 7

, and

FIG. 9

is a cross section taken along line IX—IX in FIG.


7


.




In the figure, first and second one-sided taper keys


31


and


32


are inserted inside the keyways


11




d


and


21




b


. The first and second one-sided taper keys


31


and


32


have first and second one-sided taper surfaces


31




a


and


32




a


in contact with each other. A pressing member


33


for pushing the second one-sided taper key


32


inside the keyways


11




d


and


21




b


is mounted to the sheave body


11


and the divided segment


21


by a plurality of locking bolts


34


.




A torque transmission mechanism


35


includes the keyways


11




d


and


21




b


, the first and second one-sided taper keys


31


and


32


, the pressing member


33


, and the locking bolts


34


. The rest of the construction is similar to that of Embodiment 2.




In a drive sheave of this kind, the second one-sided taper key


32


is pushed inside the keyways


11




d


and


21




b


by means of the pressing member


33


by tightening the locking bolts


34


, eliminating gaps between the first and second one-sided taper keys


31


and


32


and the keyways


11




d


and


21




b


, thereby enabling smoother, more reliable torque transmission to be achieved, in turn enabling riding comfort of the elevator to be improved.



Claims
  • 1. An elevator drive sheave disposed on a hoisting machine onto which a main rope for suspending a car is wound, the elevator drive sheave being rotated by a driving force from a motor portion of the hoisting machine, wherein said elevator drive sheave comprises:a sheave body having a cylindrical main body outer circumferential surface; a plurality of divided segments divided in a circumferential direction of said sheave body, each divided segment being mounted to said main body outer circumferential surface and including a rope groove portion into which the main rope is inserted; and a torque transmission mechanism including a plurality of keys interposed between said sheave body and said divided segments for positioning said divided segments in a circumferential direction relative to said sheave body and transmitting torque between said sheave body and said divided segments, a contact surface on said divided segments positioning said divided segments in an axial direction relative to said sheave body by contacting an axial end surface of said sheave body.
  • 2. The elevator drive sheave according to claim 1, wherein said torque transmission mechanism has a plurality of keyways disposed in said sheave body and said divided segments, respectively, said keys being inserted into said plurality of keyways.
  • 3. The elevator drive sheave according to claim 1, including a projecting portion projecting radially inward and disposed on an axial end portion of said divided segments, said contact surface being disposed on said projecting portion.
  • 4. The elevator drive sheave according to claim 1, wherein said divided segments are mounted to said sheave body by a plurality of radial bolts extending in a radial direction of said sheave body and a plurality of axial bolts extending in an axial direction of said sheave body.
  • 5. The elevator drive sheave according to claim 1, including a positioning member fixed to an axial end portion of said divided segments, said contact surface being disposed on said positioning member.
  • 6. The elevator drive sheave according to claim 5, wherein said positioning member links divided segments that are adjacent to each other.
  • 7. The elevator drive sheave according to claim 1, wherein said torque transmission mechanism includes:a plurality of keyways disposed in said sheave body and said divided segments, respectively; a first one-sided taper key inserted inside a first of said keyways, said first one-sided taper key having a first one-sided taper surface; a second one-sided taper key inserted inside the first of said keyways, said second one-sided taper key having a second one-sided taper surface in contact with said first one-sided taper surface; and a pressing member mounted to said sheave body and said divided segments for pushing said second one-sided taper key inside the first of said keyways.
PCT Information
Filing Document Filing Date Country Kind
PCT/JP01/00978 WO 00
Publishing Document Publishing Date Country Kind
WO02/06448 8/22/2002 WO A
US Referenced Citations (4)
Number Name Date Kind
2212779 Klein Aug 1940 A
3354735 Holz Nov 1967 A
4030569 Berkovitz Jun 1977 A
4284409 Van Teslaar Aug 1981 A
Foreign Referenced Citations (5)
Number Date Country
2 127 934 Apr 1984 GB
52-59442 May 1977 JP
59-12444 Aug 1978 JP
56-166356 Jan 1981 JP
60-56670 Apr 1985 JP