Final drive for a working machine and working machine

Abstract

An end drive assembly for a construction machine has a motor, a first input shaft, a first planetary gear mechanism, a second input shaft, a second planetary gear mechanism, a rotating body, a first clutch, and a second clutch. The first planetary gear mechanism includes a first sun gear, a first planetary gear, and a first ring gear. The first sun gear is connected to the first input shaft. The second planetary gear mechanism includes a second sun gear, a second planetary gear, and a second ring gear. The second sun gear is connected to the second input shaft. The second planetary gear is integrated with the first planetary gear. The rotating body is connected to the second ring gear. The first clutch connects the motor to the first input shaft. The second clutch connects the motor to the second input shaft.

Description

Technical Field

[0001] This disclosure relates to final drives for construction machinery and construction machinery. Background Technology

[0002] Construction machinery includes equipment with a final drive assembly. For example, the construction machinery disclosed in Patent Document 1 has left and right final drive assemblies. The final drive assembly includes a motor and a planetary gear mechanism. The final drive assembly reduces the rotational speed of the motor before transmitting it.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: US2021 / 179170 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] To obtain an appropriate output torque corresponding to the motor's rotational speed in construction machinery, it is preferable to have multi-stage speed regulation in the final drive assembly. However, this results in a large final drive assembly. The object of this disclosure is to obtain an appropriate output torque corresponding to the motor's rotational speed and to miniaturize the final drive assembly.

[0008] Technical solutions for solving technical problems

[0009] This disclosure discloses a final drive assembly for engineering machinery, comprising a motor, a first input shaft, a first planetary gear mechanism, a second input shaft, a second planetary gear mechanism, a rotating body, a first clutch, and a second clutch. The first input shaft is coaxially arranged with the motor. The first planetary gear mechanism is coaxially arranged with the first input shaft. The first planetary gear mechanism includes a first sun gear, first planetary gears, and a first ring gear. The first sun gear is connected to the first input shaft. The first planetary gear meshes with the first sun gear. The first ring gear meshes with the first planetary gear. The second input shaft is coaxially arranged with the first input shaft. The second planetary gear mechanism is coaxially arranged with the second input shaft. The second planetary gear mechanism includes a second sun gear, a second planetary gear, and a second ring gear. The second sun gear is connected to the second input shaft. The second planetary gear meshes with the second sun gear. The second planetary gear is integrated with the first planetary gear. The second ring gear meshes with the second planetary gear. The rotating body is connected to the second ring gear. The first clutch connects the motor to the first input shaft. The second clutch connects the motor to the second input shaft.

[0010] In this type of final drive assembly for engineering machinery, a first clutch connects the motor to a first input shaft, thereby transmitting the motor's rotation to the rotating body via the first input shaft, a first planetary gear mechanism, and a second planetary gear mechanism. Conversely, a second clutch connects the motor to a second input shaft, thereby transmitting the motor's rotation to the rotating body via the second input shaft and a second planetary gear mechanism. This results in an appropriate output torque corresponding to the motor's rotational speed. Furthermore, the first and second planetary gear mechanisms are interconnected by integrating the first and second planetary gears. Therefore, the number of components is reduced, thereby miniaturizing the final drive assembly.

[0011] Other types of construction machinery disclosed herein include a vehicle body and a running gear. The running gear supports the vehicle body. The running gear includes the aforementioned final drive assembly for construction machinery.

[0012] Invention Effects

[0013] According to this disclosure, it is possible to obtain an appropriate output torque corresponding to the speed of the motor, and to miniaturize the final drive assembly. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the engineering machinery used in the implementation method.

[0015] Figure 2 This is a cross-sectional view of the vertical plane passing through the axis of the drive component.

[0016] Figure 3 This is a schematic diagram of the final driving component.

[0017] Figure 4 This is a schematic diagram of the final drive component representing the transmission path of the driving force at the first speed.

[0018] Figure 5 This is a schematic diagram of the final drive component representing the transmission path of the driving force at the second speed. Detailed Implementation

[0019] The engineering machinery of the embodiments will be described below with reference to the accompanying drawings. Figure 1 This is a perspective view of the construction machinery 1 in this embodiment. The construction machinery 1 in this embodiment is a bulldozer. Figure 1 As shown, the construction machinery 1 has a vehicle body 2, a working device 3, and left and right driving devices 4A and 4B.

[0020] The vehicle body 2 includes a driver's cab 5 and a power compartment 6. The power compartment 6 is located in front of the driver's cab 5. The upper surface of the power compartment 6 faces forward and slopes downward. A working device 3 is supported to be movable relative to the vehicle body 2. The working device 3 includes blades 7.

[0021] The left and right running gears 4A and 4B support the vehicle body 2. Running gear 4A includes tracks 11, track frames 12, and a final drive assembly 13. The track frames 12 support the tracks 11 via a plurality of rollers and idler wheels (not shown). The tracks 11 are wound around the final drive assembly 13. The axis Ax1 of the final drive assembly 13 extends along the left-right direction of the construction machinery 1. Furthermore, the structure of running gear 4B is the same as that of running gear 4A, and its description is omitted.

[0022] Figure 2 It is a cross-sectional view on the vertical plane passing through the axis Ax1 of the drive assembly 13. Figure 3 This is a schematic diagram of the final driver component 13. (As shown...) Figure 2 As shown, the final drive assembly 13 includes a support shaft 21, a motor 22, a first input shaft 23, a first planetary gear mechanism 24, a second input shaft 25, a second planetary gear mechanism 26, a rotating body 27, a first clutch 28, and a second clutch 29.

[0023] Support shaft 21 is fixed to track frame 12. Support shaft 21 extends along the axial direction (hereinafter referred to as "axial direction") of final drive assembly 13. Support shaft 21 has an internal space S1. Motor 22 is disposed within the internal space S1 of support shaft 21. Motor 22 is coaxially disposed with support shaft 21. Motor 22 is, for example, an electric motor. Motor 22 includes stator 31 and rotor 32. Stator 31 is fixed to support shaft 21. Rotor 32 is disposed within stator 31. Rotor 32 is supported on support shaft 21 via bearings 33 and 34. Rotor 32 is rotatable relative to support shaft 21.

[0024] The first input shaft 23 is coaxially arranged with the motor 22. The first input shaft 23 extends along the axial direction through the rotor 32. The first input shaft 23 is supported on the rotor 32 via a bearing 35. The first input shaft 23 is rotatable relative to the rotor 32.

[0025] The first planetary gear mechanism 24 is coaxially arranged with the first input shaft 23. The motor 22, the first planetary gear mechanism 24, and the second planetary gear mechanism 26 are arranged in the axial direction. The first planetary gear mechanism 24 is arranged between the motor 22 and the second planetary gear mechanism 26 in the axial direction. The first planetary gear mechanism 24 includes a first sun gear 41, a first planetary gear 42, a first ring gear 43, and a first planet carrier 44.

[0026] The first sun gear 41 is connected to the first input shaft 23. The first sun gear 41 and the first input shaft 23 rotate integrally. The first planetary gear 42 meshes with the first sun gear 41. The first planetary gear 42 is rotatable about the first sun gear 41. The first planetary gear 42 is supported on the rotating shaft 46 via a bearing 45. The rotating shaft 46 is supported on the first planet carrier 44. The first planetary gear 42 is rotatable about the rotating shaft 46. The first ring gear 43 meshes with the first planetary gear 42. The first ring gear 43 is connected to the support shaft 21. The first ring gear 43 is fixed to the support shaft 21 in a non-rotatable manner.

[0027] The second input shaft 25 is coaxially arranged with the first input shaft 23. The second input shaft 25 extends axially through the rotor 32. The second input shaft 25 is rotatable relative to the rotor 32.

[0028] The second planetary gear mechanism 26 is coaxially configured with the second input shaft 25. The second planetary gear mechanism 26 includes a second sun gear 51, a second planetary gear 52, a second ring gear 53, and a second planet carrier 54. The second sun gear 51 is connected to the second input shaft 25. The second sun gear 51 and the second input shaft 25 rotate integrally.

[0029] The second planetary gear 52 meshes with the second sun gear 51. The second planetary gear 52 is rotatable about the second sun gear 51. The second planetary gear 52 is coaxially arranged with the first planetary gear 42. The second planetary gear 52 and the first planetary gear 42 are integrated. The second planetary gear 52 and the first planetary gear 42 rotate together around the first sun gear 41 and the second sun gear 51. The second planetary gear 52 is supported on the rotation shaft 46 via a bearing 55. The second planetary gear 52 is rotatable about the rotation shaft 46. The second planetary gear 52 and the first planetary gear 42 rotate together around the rotation shaft 46. The first planet carrier 44 of the first planetary gear mechanism 24 and the second planet carrier 54 of the second planetary gear mechanism 26 are rotatable together with the rotation shaft 46 around the axis Ax1.

[0030] The diameter of the second planetary gear 52 is larger than that of the first planetary gear 42. However, the diameter of the second planetary gear 52 may also be smaller than or equal to that of the first planetary gear 42. The second planetary gear 52 has more teeth than the first planetary gear 42. The second planetary carrier 54 supports the rotating shaft 46. The second ring gear 53 meshes with the second planetary gear 52. Furthermore, only a portion of the plurality of first planetary gears 42 and a portion of the plurality of second planetary gears 52 are illustrated in the accompanying drawings.

[0031] The rotating body 27 is coaxially arranged with the support shaft 21. The rotating body 27 is supported on the support shaft 21 via bearings 37 and 38. The rotating body 27 is rotatable relative to the support shaft 21. The rotating body 27 includes a sprocket 61 and a sprocket hub 62. A track 11 is wound around the sprocket 61. The sprocket hub 62 is connected to the sprocket 61. The sprocket 61 protrudes radially from the outer peripheral surface of the sprocket hub 62. A first planetary gear mechanism 24 and a second planetary gear mechanism 26 are disposed within the sprocket hub 62. A second gear ring 53 is connected to the inner surface of the sprocket hub 62. The sprocket hub 62 and the second gear ring 53 rotate integrally.

[0032] When engaged, the first clutch 28 connects the motor 22 to the first input shaft 23. Thus, the first input shaft 23 rotates integrally with the rotor 32. When disengaged, the first clutch 28 disconnects the motor 22 from the first input shaft 23. Thus, the first input shaft 23 can idle relative to the rotor 32. The first clutch 28 is disposed within the rotor 32. The first clutch 28 includes multiple clutch plates fixed to the rotor 32 and multiple clutch plates fixed to the first input shaft 23.

[0033] When engaged, the second clutch 29 connects the motor 22 to the second input shaft 25. Thus, the second input shaft 25 rotates integrally with the rotor 32. When disengaged, the second clutch 29 disconnects the motor 22 from the second input shaft 25. Thus, the second input shaft 25 can idle relative to the rotor 32. The second clutch 29 is disposed within the rotor 32. The second clutch 29 includes multiple clutch plates fixed to the rotor 32 and multiple clutch plates fixed to the second input shaft 25.

[0034] Figure 4 This is a schematic diagram of the final drive component 13, representing the transmission path of the driving force at the first speed. (See diagram below.) Figure 4 As shown, at the first speed, the first clutch 28 is disengaged, and the second clutch 29 is engaged. In this state, the motor 22 is connected to the second input shaft 25. The rotation from the motor 22 is transmitted to the rotating body 27 via the second input shaft 25, the second sun gear 51, the second planetary gear 52, and the second ring gear 53. Thus, the rotation of the motor 22 is transmitted to the rotating body 27 at a reduction ratio of the first speed, and the sprocket 61 rotates.

[0035] Figure 5This is a schematic diagram of the final drive assembly 13, showing the transmission path of the driving force at the second speed. At the second speed, the first clutch 28 is engaged, and the second clutch 29 is disengaged. In this state, the motor 22 is connected to the first input shaft 23. Rotation from the motor 22 is transmitted to the rotating body 27 via the first input shaft 23, the first sun gear 41, the first planetary gear 42, the second planetary gear 52, and the second ring gear 53. Thus, the rotation of the motor 22 is transmitted to the rotating body 27 at a reduction ratio smaller than that of the first speed, causing the sprocket 61 to rotate.

[0036] In the final drive assembly 13 for construction machinery described above, the reduction ratio is switched between a first speed and a second speed by switching the engagement of the first clutch 28 and the second clutch 29. This results in an appropriate output torque corresponding to the rotational speed of the motor 22. Furthermore, the first planetary gear mechanism 24 and the second planetary gear mechanism 26 are interconnected by integrating the first planetary gear 42 and the second planetary gear 52. Therefore, the number of components is reduced, thereby miniaturizing the final drive assembly 13.

[0037] The present invention has been described above as an embodiment of the invention, but the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

[0038] The construction machinery 1 is not limited to bulldozers, but can also be excavators, wheel loaders, graders, dump trucks, or other machinery. The structure or configuration of the motor 22, the first planetary gear mechanism 24, the second planetary gear mechanism 26, the first clutch 28, or the second clutch 29 is not limited to the above-described embodiments and can be modified. For example, the first clutch 28 and the second clutch 29 can also be configured outside the rotor 32. The motor 22 can also be a hydraulic motor. The number of teeth on the second planetary gear 52 can also be less than the number of teeth on the first planetary gear 42.

[0039] Industrial availability

[0040] According to this disclosure, it is possible to obtain an appropriate output torque corresponding to the speed of the motor, and to miniaturize the final drive assembly.

[0041] Explanation of reference numerals in the attached figures

[0042] 1: Construction Machinery

[0043] 13: Final Driver Component

[0044] 21: Support shaft

[0045] 22: Motor

[0046] 23: First input axis

[0047] 24: First planetary gear mechanism

[0048] 25: Second input axis

[0049] 26: Second planetary gear mechanism

[0050] 27: Solid of Revolution

[0051] 28: First Clutch

[0052] 29: Second Clutch

[0053] 32: Rotor

[0054] 41: First Sun Gear

[0055] 42: First Planetary Gear

[0056] 43: First gear ring

[0057] 51: Second Sun Gear

[0058] 52: Second Planetary Gear

[0059] 53: Second gear ring

[0060] 61: Sprocket

[0061] 62: Sprocket Hub

Claims

1. A final drive component for engineering machinery, characterized in that, have: motor; A first input shaft is configured coaxially with the motor; A first planetary gear mechanism, which is coaxially configured with the first input shaft, includes a first sun gear connected to the first input shaft, a first planet gear meshing with the first sun gear, and a first gear ring meshing with the first planet gear; The second input axis is configured coaxially with the first input axis; The second planetary gear mechanism, which is coaxially configured with the second input shaft, includes a second sun gear connected to the second input shaft, a second planet gear meshing with the second sun gear and integrated with the first planet gear, and a second gear ring meshing with the second planet gear; A rotating body, which is connected to the second gear ring; A first clutch connects the motor to the first input shaft; The second clutch connects the motor to the second input shaft.

2. The final drive assembly for engineering machinery according to claim 1, characterized in that, The second input shaft passes through the first input shaft and extends along the axial direction.

3. The final drive assembly for engineering machinery according to claim 1, characterized in that, The motor includes a rotor. The first clutch and the second clutch are disposed within the rotor.

4. The final drive assembly for engineering machinery according to claim 1, characterized in that, The rotating body includes a sprocket and a sprocket hub connected to the sprocket. The first planetary gear mechanism and the second planetary gear mechanism are configured within the sprocket hub.

5. The final drive assembly for engineering machinery according to claim 4, characterized in that, The first gear ring is connected to the support shaft. The second toothed ring is connected to the inner surface of the sprocket hub.

6. The final drive assembly for engineering machinery according to claim 1, characterized in that, It also includes a support shaft that supports the rotating body as a rotatable component. The motor is configured within the support shaft.

7. An engineering machinery, characterized in that, have: Vehicle body; The running gear that supports the vehicle body. The driving device includes the final drive component as described in any one of claims 1 to 6.

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