Patent Application
20170167108
The present disclosure generally relates to bucket assemblies for machines, in particular, a side wall for a movable part of an excavator bucket.
A machine such as a hydraulic excavator may be equipped with a bucket assembly to perform various operations at a work site. Such machines often include implements (e.g., hydraulic shovels or buckets) powered by hydraulic pressure. Operations carried out by such machines may include, for example, penetrating material in the ground or in a pile, scooping material, moving material, and depositing the material in a desired location. During operation, various components of the bucket assembly may be worn and may eventually be damaged. This may require replacing one or more parts of the bucket assembly, which may result in undesired downtimes and an increase in the operating costs of associated machines.
The disclosed systems and methods are directed at least in part to improving known bucket assemblies.
In one aspect, the present disclosure relates to a side wall of a movable part of an excavator bucket. The side wall comprises a sheet metal base including an attachment portion for attaching the side wall to a rear wall of the excavator bucket. The sheet metal base includes a cranked portion extending from the attachment portion, and an extension portion extending from the cranked portion to the distal end of the sheet metal base.
In another aspect, the present disclosure relates to a movable part of an excavator bucket. The movable part comprises a first side wall and a second side wall, and a bottom connected to the first side wall and the second side wall. Each of the first side wall and the second side wall comprises a sheet metal base including an attachment portion for attaching the side wall to a rear wall of the excavator bucket. The sheet metal base includes a cranked portion extending from the attachment portion, and an extension portion extending from the cranked portion to the distal end of the sheet metal base.
In yet another aspect, the present disclosure relates to a machine comprising an excavator bucket including a rear wall and a movable part, and a hydraulic actuator configured to pivot the movable part with respect to the rear wall. The movable part comprises a first side wall and a second side wall, and a bottom connected to the first side wall and the second side wall. Each of the first side wall and the second side wall comprises a sheet metal base including an attachment portion for attaching the side wall to a rear wall of the excavator bucket. The sheet metal base includes a cranked portion extending from the attachment portion, and an extension portion extending from the cranked portion to the distal end of the sheet metal base.
In a further aspect of the present disclosure, a method of forming a side wall of a movable part of an excavator bucket comprises providing a flat sheet metal base. The method further comprises bending the flat sheet metal base to form an attachment portion for attaching the side wall to a rear wall of the excavator bucket, a cranked portion extending from the attachment portion, and an extension portion extending from the cranked portion to the distal end of the sheet metal base.
Other features and aspects of the present disclosure will be apparent from the following description and the accompanying drawings.
The following is a detailed description of exemplary embodiments of the present disclosure. The exemplary embodiments described herein are intended to teach the principles of the present disclosure, enabling those of ordinary skill in the art to implement and use the present disclosure in many different environments and for many different applications. Therefore, the exemplary embodiments are not intended to be, and should not be considered as a limiting description of the scope of protection. Rather, the scope of protection shall be defined by the appended claims.
The present disclosure may be based in part on the realization that, when a front part of an excavator bucket includes side walls which are formed of several parts connected to each other by welding, a weld between such parts may disturb a distribution of forces between the same. Further, the quality of the weld may vary. Accordingly, cracks in the region of such welds are the most common causes for damaging of the front part of such an excavator bucket. If this happens, the excavator has to be temporarily taken out of service over an extended period of time, and expensive repairs are necessary. According to the present disclosure, a side wall of a front part of an excavator bucket is formed with a reduced number of parts, thereby eliminating one or more welds.
Further, the present disclosure may be based on the realization that, in case a cast iron lever is used for attaching the side walls of a front part of an excavator bucket to a rear wall of the same, the cast iron lever may break due to the huge load when the bucket is opened. In particular, during opening of the bucket, the associated hydraulic actuators must work against the weight of the front part, and the resulting force is transmitted via the upper part of the cast iron lever. Due to wear of material and imperfections during the casting, the lever may break. Accordingly, the present disclosure does not use such a cast iron lever for attaching the front part to the rear wall of the excavator bucket.
In addition, the present disclosure may be based on the realization that, when the front part is attached to the rear wall of the excavator bucket, the side walls of the front part must extend outward from the rear wall to reduce the resistance during digging operations. Accordingly, the side walls must include a cranked portion to allow an extension of the side walls outward from the point of attachment to the rear wall of the excavator bucket. According to the present disclosure, this cranked portion is formed by bending a sheet metal base to result in the desired cranked portion.
Referring now to the drawings, an exemplary embodiment of a machine 100 is schematically shown in
Machine 100 may further include an operator station or cab 104 containing controls for operating machine 100, for example, a control panel 106. Cab 104 may be part of a superstructure 103 rotatably mounted on an undercarriage 101 of machine 100. Control panel 106 may include joysticks, levers, buttons, and the like and may be operatively connected to a hydraulic system 108 of machine 100.
In some embodiments, cab 104 may further include interfaces such as a display for conveying information to an operator, and may include a keyboard, a touch screen or any other suitable mechanism for receiving an input from an operator to control or operate machine 100, hydraulic system 108 and/or other machine components. Alternatively or additionally, an operator may be located outside of cab 104 and/or some distance away from machine 100 and may control machine 100, hydraulic system 108 and/or other machine components remotely.
Hydraulic system 108 may include fluid components such as, for example, hydraulic actuators or cylinders, tanks, valves, accumulators, orifices and other suitable components for producing a pressurized flow of hydraulic fluid. Hydraulic system 108 may further comprise fluid sources, for example, one or more tanks and/or a reservoir (not shown), and one or more hydraulic pumps, which may include variable displacement pumps, fixed displacement pumps, variable delivery pumps or other suitable pressurizing systems. The hydraulic pumps may be drivably connected to engine 102, or may be indirectly connected to engine 102 via a gear mechanism or the like. It is also contemplated that hydraulic system 108 may include multiple sources of pressurized fluid interconnected to provide hydraulic fluid for hydraulic system 108.
Hydraulic system 108 may include a plurality of hydraulic actuators, for example, one or more hydraulic actuators 120 for operating a boom of machine 100, one or more hydraulic actuators 122 for operating a stick of machine 100, one or more rods 123, one or more hydraulic actuators 124 for operating an excavator bucket 126 of machine 100, one or more hydraulic motors (not shown) for operating a swing mechanism of machine 100, and hydraulic motors associated with a left propel drive and a right propel drive of machine 100 for propelling machine 100 on a work surface 105. The swing mechanism may be operable to rotate superstructure 103 with respect to undercarriage 101 of machine 100. It should be appreciated that, in other embodiments, different numbers of hydraulic motors and/or hydraulic actuators may be provided for the different hydraulic circuits.
Machine 100 also includes a control unit (not shown) suitable for controlling hydraulic system 108 and other components of machine 100. The control unit may be operatively connected to an input device (not shown) and may be adapted to receive an input from an operator indicative of a desired movement (or a desired velocity) of machine 100 or an implement of machine 100, for example, excavator bucket 126, and thus may determine a power demand associated with each hydraulic actuator or motor of hydraulic system 108 for performing the desired movements.
The control unit may include one or more control modules (for example, ECMs, ECUs, etc.). The one or more control modules may include processing units, a memory, sensor interfaces and/or control interfaces for receiving and transmitting signals. The processing units may represent one or more logic and/or processing components used by the system according to the present disclosure to perform various communications, control and/or diagnostic functions. The one or more control modules may communicate to each other and to other components within and interfacing the control unit using any appropriate communication mechanisms, for example, a CAN bus.
Further, the processing units may be adapted to execute instructions, for example, from a storage device such as a memory. The one or more control modules may each be responsible for executing software code for hydraulic system 108 and/or other components of machine 100. The processing units may include, for example, one or more general purpose processing units and/or special purpose units (for example, ASICs, FPGAs, etc.). In some embodiments, the functionality of the processing units may be embodied in an integrated microprocessor or microcontroller, including an integrated CPU, a memory, and one or more peripherals.
Referring now to
As shown in
Movable part 130 includes a first side wall 132, a second side wall 134 and a bottom 136. First and second side walls 132, 134 are pivotably connected to rear wall 138 via pins 138A, 138B, respectively. Further, first and second side walls 132 and 134 may be connected to bottom 136, for example, by welding or in any other suitable manner to form movable part 130 of excavator bucket 126.
One or more hydraulic actuators (not shown) may be mounted on rear wall 128 of excavator bucket 126 and engage with engagement portions of side walls 132, 134, as will be described in more detail below. Upon actuation of the hydraulic actuators connected to side walls 132, 134, movable part 130 may be tilted upwards to open excavator bucket 126, as shown in
As shown in
Referring now to
As shown in
Sheet metal base 140 includes an attachment portion 141, a cranked portion 146, and an extension portion 154.
Attachment portion 141 may be formed as a substantially flat portion and may be configured to be attached to rear wall 128 of excavator bucket 126. In the exemplary embodiment shown in
Cranked portion 146 extends from attachment portion 141 towards a distal end 155 of sheet metal base 140, with a width that is gradually increasing towards distal end 155. In addition, cranked portion 146 is bent such that it extends further outwards than attachment portion 141 when it is attached to rear wall 128. It will be readily appreciated that cranked portion 146 includes a first portion 146a that is bent in a first direction d1 with respect to a direction of extension of attachment portion 141, and a second portion 146b that is bent into an opposite second direction d2 (see
Extension portion 154 extends from second portion 146b of cranked portion 146 to distal end 155 of sheet metal base 140, as shown in
As shown in
Turning now to
In accordance with exemplary embodiments of the present disclosure, sheet metal base 140 may have a length of between around 1500 and around 4500 mm, and a width of between around 500 and around 2500 mm. Cranked portion 146 may be formed such that it has a length in the direction of extension of sheet metal base 140 that is between, for example, ⅛ and ⅓, preferably ⅙ and ¼, of the length of sheet metal base 140. Accordingly, cranked portion 146 may extend over a length from between around 150 to around 1500 mm. Further, cranked portion 146 may be formed to have a width in the transversal direction of sheet metal base 140 from between around 250 to around 1500 mm. An angle between first portion 146a and attachment portion 141 may be between around 20 and around 45 degrees, and an angle between second portion 146a and extension portion 154 may be between around 20 and around 45 degrees. Of course, the configuration of cranked portion 146 may be determined individually for different excavator buckets.
Sheet metal base 140 may further be formed from a flat sheet metal part having a thickness of between 30 and 250 mm, depending on the size of excavator bucket 126. It will be appreciated that the surface of sheet metal base 140 may be machined to result in desired properties of sheet metal base 140, for example, front edge 148. Machining steps may include flame cutting, plasma cutting or laser cutting, grinding to provide a good edge surface quality, and removal of material by means of grinding, milling or drilling. In addition, heat treatment and/or flame straightening may be applied to sheet metal base 140.
As previously described, sheet metal members 142, 144 may be connected to sheet metal base 140 by welding. However, it will be readily appreciated that sheet metal members 142, 144 may be connected to sheet metal base 140 by other means, for example, using bolts or the like.
The industrial applicability of the systems and methods disclosed herein will be readily appreciated from the foregoing discussion. One exemplary machine suited to the disclosure is an excavator such as a large mining excavator. Similarly, the systems and methods described can be adapted to a large variety of machines and tasks.
In accordance with some exemplary embodiments, a method of forming a side wall of a movable part of an excavator bucket may comprise providing a flat sheet metal base and bending the flat sheet metal base to form an attachment portion for attaching the side wall to a rear wall of the excavator bucket, a cranked portion extending from the attachment portion towards a distal end of the sheet metal base, and an extension portion extending from the cranked portion to the distal end of the sheet metal base.
Sheet metal base 140 may be formed from any appropriate material, such as metals, alloys or the like. Typical thicknesses of sheet metal base 140 may range from between around 30 to around 250 mm. Sheet metal base 140 may be bent into shape to result in cranked portion 146 having desired dimensions using any known technique, for example, by flame cutting, plasma cutting or laser cutting, then bending, and then again cutting. Grinding may be needed to ensure good edge quality. Material may be removed by means of grinding, milling or drilling after bending. Heat treatment may be applied before and/or after bending. Flame straightening may be required after bending to keep dimensional and/or geometrical tolerances.
The exemplary method of forming the side wall may further comprise welding one or more sheet metal members to sheet metal base 140 to form side wall 132 and/or side wall 134. As mentioned above, alternatively one or more sheet metal members 142, 144 may be attached to sheet metal base 140 using appropriate fastening elements. For example, if bolts are used to attach sheet metal members 142, 144 to sheet metal base 140, corresponding through holes may be formed in sheet metal base 140.
In addition, the exemplary method may further comprise forming holes 150, 152 for receiving pin 138A and engaging with a hydraulic actuator for pivoting movable part 130, respectively. Hole 150 and/or hole 152 may include a hub (not shown) for distributing loads, which may be welded in the corresponding hole and may be formed of one or more parts. In addition, various edges of sheet metal base 140 may be machined to facilitate welding of sheet metal members 142, 144 to sheet metal base 140, and to result in the desired durability of front edge 148 of sheet metal base 140 during operation of machine 100. For example, grinding of weld seams may be needed to ensure a smooth transition and a good surface quality.
It will be appreciated that the foregoing description provides examples of the disclosed systems and methods. However, it is contemplated that other implementations of the disclosure may differ in detail from the foregoing examples. All references to the disclosure or examples thereof are intended to reference the particular example being discussed at that point and are not intended to imply any limitation as to the scope of disclosure more generally. All methods described herein may perform in any suitable order unless otherwise indicated herein or clearly contradicted by context.
Accordingly, this disclosure includes all modifications and equivalences of the subject-matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the disclosure unless otherwise indicated herein or clearly contradicted by context.
Although the preferred embodiments of this disclosure have been described herein, improvements and modifications may be incorporated without departing from the scope of the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 14154733.1 | Feb 2014 | EP | regional |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2015/015173 | 2/10/2015 | WO | 00 |
