Planetary wheel shaft positioning structure, wheel reducer and operating machinery

Abstract

The utility model relates to a planetary axle positioning structure, a wheel-side reducer including the planetary axle positioning structure, and an operating machine including the wheel-side reducer. The planetary axle positioning structure includes a planetary wheel carrier, a plurality of planetary axles, and a plurality of locking members. The planetary wheel carrier has a plurality of first axial holes and a plurality of second axial holes arranged relatively along its axial direction. Each planetary axle includes a first end portion arranged in a corresponding first axial hole and a second end portion arranged in a corresponding second axial hole. Each locking member is configured to be connected to the planetary wheel carrier to limit the corresponding planetary axle. The second end portion is formed with a limiting portion which is recessed axially inwardly by its end face, and the locking member has a first portion engaged with the limiting portion and a second portion connected to the planetary wheel carrier. The planetary axle positioning structure of the utility model can ensure that the planetary axle does not move or rotate when the wheel-side reducer is working, and is simple to process and convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of parts of operating machinery, in particular to a planetary axle positioning structure, a wheel-side reducer comprising the planetary axle positioning structure, and an operating machinery comprising the wheel-side reducer. Background Art

[0002] The drive axle of working machinery such as loaders, bulldozers, excavators, etc. generally adopts a two-stage reduction form combining a main reducer and a wheel-side reducer. The wheel-side reducer is usually a planetary gear type, including a planetary gear reduction mechanism composed of a sun gear, a ring gear, planetary gears, a planetary wheel carrier, etc. The sun gear can be connected to the half shaft through a spline and rotate with the half shaft. The ring gear can be fixedly connected to the ring gear bracket, and the ring gear bracket can be connected to the half shaft sleeve through a spline. Multiple planetary gears are rotatably mounted on the planetary wheel carrier through their respective planetary wheel shafts, and are respectively meshed with the sun gear and the ring gear. The planetary wheel carrier can be connected to the wheel hub through bolts. The wheel hub is supported on the half shaft sleeve through the first bearing on the one hand, and on the ring gear bracket through the second bearing on the other hand. The first bearing and the second bearing as the wheel hub bearing are pre-tightened by the locking nut.

[0003] For the above-mentioned wheel-side reducer in the prior art, in order to position the planetary gear shaft and the planetary gear carrier in the axial and circumferential directions, usually one end of the planetary gear shaft extending out of the planetary gear carrier is installed to the end face of the planetary gear carrier through an end cover and a fastener, and positioning holes for accommodating steel balls are respectively processed at corresponding positions of the planetary gear shaft and the planetary gear carrier. However, it is difficult to process holes on the planetary gear shaft, and the corresponding heat treatment may cause cracks. In addition, the planetary gear shaft is also prone to impact the end cover during operation, causing oil leakage. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the above problems and / or other problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, according to one aspect of the utility model, a planetary gear shaft positioning structure is provided, and the planetary gear shaft positioning structure includes a planetary gear carrier, a plurality of planetary gear shafts and a plurality of locking members. The planetary gear carrier has a plurality of first axial holes and a plurality of second axial holes arranged relatively to each other along its axial direction. Each of the planetary gear shafts includes a first end portion arranged in a corresponding first axial hole and a second end portion arranged in a corresponding second axial hole. Each of the locking members is configured to be connected to the planetary gear carrier to limit the corresponding planetary gear shaft. The second end portion is formed with a limiting portion that is axially recessed inwardly by its end face, and the locking member has a first portion engaged with the limiting portion and a second portion connected to the planetary gear carrier.

[0006] According to an embodiment of the present utility model, the limiting portion includes a radial plane extending perpendicular to the axial direction of the planetary gear shaft, and the first part of the locking member includes a bottom surface engaged with the radial plane.

[0007] According to an embodiment of the present invention, the radial plane is aligned with the outer side surface of the planet carrier.

[0008] According to an embodiment of the present utility model, the limiting portion includes an axial plane extending parallel to the axial direction of the planetary gear shaft, and the first part of the locking member includes a bottom surface engaged with the radial plane and a side surface engaged with the axial plane.

[0009] According to an embodiment of the present invention, the second part of the locking member is connected to the planetary wheel carrier via a fastener.

[0010] According to one embodiment of the utility model, the second part of each locking member is provided with at least one through hole, the planetary wheel carrier is provided with at least one threaded hole at the periphery corresponding to each second axial hole, and the fastener passes through the through hole and is threadedly connected to the planetary wheel carrier in the corresponding threaded hole.

[0011] According to an embodiment of the present invention, each of the locking members has two through holes, and the planetary wheel carrier is provided with two threaded holes at the periphery corresponding to each of the second shaft holes.

[0012] According to an embodiment of the present invention, the locking member is an integrally formed plate-shaped structure.

[0013] According to one embodiment of the present utility model, the second shaft hole is configured as a stepped hole having a step portion, and the planetary gear shaft is configured as a stepped shaft having a shoulder, and the step portion cooperates with the shoulder to limit the planetary gear shaft in the axial direction.

[0014] According to another aspect of the utility model, a wheel-side reducer is provided, which includes a housing, a ring gear, a sun gear, a plurality of planetary gears and the planetary axle positioning structure as described above, each of the planetary gears is sleeved on the corresponding planetary axle and respectively meshes with the sun gear and the ring gear, the housing defines a accommodating cavity for accommodating the ring gear, the sun gear and the planetary gears, and the planetary wheel carrier is fixedly connected to the housing on the side opposite to the locking member or is rotatably supported by the housing.

[0015] According to another aspect of the utility model, a working machine is provided. The working machine includes the wheel reducer as described above.

[0016] The planetary gear shaft positioning structure of the utility model is provided with a limiting portion which is recessed inwardly along the axial direction by the end surface of the planetary gear shaft at the second end portion, and the locking member has a first portion engaged with the limiting portion and a second portion connected with the planetary wheel carrier. Thus, the planetary gear shaft can be limited in the circumferential direction and the axial direction, ensuring that the planetary gear shaft does not move or rotate when the wheel-side reducer is working. Moreover, the planetary gear shaft positioning structure is simple to process and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features and advantages of the present invention will be clearly understood through the detailed description provided below with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and thus cannot be regarded as limiting the present invention, wherein:

[0018] Figure 1 A three-dimensional diagram of a planetary gear shaft positioning structure according to an embodiment of the utility model is shown.

[0019] Figure 2 An exploded view of the planetary gear shaft positioning structure is shown.

[0020] Figure 3 A front view showing the planetary gear shaft positioning structure.

[0021] Figure 4 The planetary gear shaft positioning structure is shown along Figure 3 Sectional view along line AA.

[0022] Figure 5 Show Figure 4 Magnified view of part B.

[0023] Figure 6 A three-dimensional view of a planetary wheel carrier showing the planetary wheel shaft positioning structure.

[0024] Figure 7 A three-dimensional view showing the locking member and the planetary axle of the planetary axle positioning structure.

[0025] Description of reference numerals:

[0026] 1. Planetary wheel carrier; 11. First axial hole; 12. Second axial hole; 13. Threaded hole; 14. Step portion; 2. Planetary wheel shaft; 21. First end portion; 22. Second end portion; 23. Limiting portion; 231. Radial plane; 232. Axial plane; 24. Shoulder; 3. Locking piece; 31. First part; 311. Bottom surface; 312. Side surface; 32. Second part; 33. Through hole; 4. Fastener; 5. Planetary gear; 6. Gasket; 7. Needle roller; 8. Spacer. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless clearly stated in the claims.

[0028] In the following, terms such as "first", "second", etc. are used to describe the elements of the present application. These terms are only used to distinguish the various elements, and are not used to limit the nature, order or number of these elements. The terms "including" and "having" are used to express an open-ended inclusive meaning, and mean that there may be additional elements / components in addition to the listed elements / components.

[0029] Figures 1 to 4 FIG. 2 shows a planetary gear shaft positioning structure according to an embodiment of the utility model. Figure 1 and Figure 2 As shown, the planetary axle positioning structure according to this embodiment includes a planetary wheel carrier 1 , a plurality of planetary axles 2 and a plurality of locking members 3 . Figure 6 A perspective view of the planet carrier 1 is shown. Figure 7 The planet axle 2 and the locking element 3 are shown.

[0030] refer to Figure 1 , Figure 2 and Figure 6 , the planetary wheel carrier 1 in this embodiment may include a first end plate and a second end plate that are axially opposite to each other, and may also include a plurality of connection portions that are spaced apart and extend from the first end plate to the periphery of the second end plate, respectively. The first end plate is provided with a plurality of first axial holes 11 spaced apart along its circumference. The second end plate is provided with a plurality of second axial holes 12 spaced apart along its circumference that are arranged one by one opposite to the plurality of first axial holes 11. In this embodiment, the first axial hole 11 is a blind hole, and the second axial hole 12 is a through hole, so that the planetary wheel shaft 2 is inserted into the planetary wheel carrier 1 from the second axial hole 12 to the first axial hole 11. Although the number of the first axial hole 11 and the second axial hole 12 in this embodiment is three, those skilled in the art will appreciate that the number of the first axial hole 11 and the second axial hole 12 may also be four or even more.

[0031] The planetary gear carrier 1 is provided with a plurality of connection holes at intervals on the periphery of its first end plate, which can be used to connect to the housing (not shown) of the planetary gear transmission mechanism. The planetary gear transmission mechanism includes a plurality of (three in this embodiment) planetary gears 5, and a sun gear and a ring gear (not shown). Each planetary gear 5 is mounted on a corresponding planetary gear shaft 2. Figure 2 and Figure 4 As shown, a gasket 6, a needle roller 7 and a spacer sleeve 8 are arranged between each planetary gear 5 and the corresponding planetary gear shaft 2. The two gaskets 6 are respectively in contact with the first end plate and the second end plate of the planetary gear carrier 1 on both sides of the axial direction. Two rows of needle rollers 7 are arranged along the axial direction of the planetary gear 5 and are respectively arranged around the circumference of each planetary gear 5. The spacer sleeve 8 is arranged between the two rows of needle rollers 7.

[0032] According to an exemplary embodiment of the planetary axle 2, each planetary axle 2 may include: Figure 2 and Figure 7 As shown in the figure, the first end 21, the main body and the second end 22 are sequentially distributed from right to left. In the assembled state of the planetary gear transmission mechanism, the first end 21 of each planetary shaft 2 is arranged in the corresponding first shaft hole 11, the second end 22 is arranged in the corresponding second shaft hole 12, and the main body is arranged between the first end plate and the second end plate of the planetary wheel carrier 1. The end surface of the second end 22 of the planetary shaft 2 is provided with a limiting portion 23, and the limiting portion 23 is recessed inwardly from the end surface of the second end 22 along the axial direction, as shown in FIG. Figure 7 shown.

[0033] Furthermore, if Figure 7 As shown, the stopper 23 may include a radial plane 231 and an axial plane 232. The radial plane 231 is perpendicular to the axial extension of the planetary gear shaft 2. The axial plane 232 is parallel to the axial extension of the planetary gear shaft 2. In the assembled state of the planetary gear transmission mechanism, the radial plane 231 is preferably aligned with the outer surface of the planetary gear carrier 1 (the surface of the second end plate of the planetary gear carrier 1 facing away from the first end plate).

[0034] The locking member 3 in this embodiment is an integrally formed plate-shaped structure, including: Figure 7 The first part 31 and the second part 32 are shown. The first part 31 can be engaged with the limiting portion 23. More specifically, the first part 31 of the locking member 3 includes a bottom surface 311 and a side surface 312. The bottom surface 311 is engaged with the radial plane 231 of the limiting portion 23, and the side surface 312 is engaged with the axial plane 232 of the limiting portion 23.

[0035] The second portion 32 of the locking member 3 can be connected to the second end plate of the planetary wheel carrier 1 by means of a fastener 4. For example, the fastener 4 can be a bolt, such as Figure 2 The second portion 32 of the locking member 3 is formed with a through hole 33 for the fastener 4 to pass through. Figure 7 Correspondingly, the second end plate of the planetary wheel carrier 1 is formed with a threaded hole 13 near the periphery of the second shaft hole 12, as shown in FIG. Figure 6 shown.

[0036] The second part 32 of each locking member 3 is preferably connected to the planetary wheel carrier 1 through two fasteners 4. Accordingly, the second part 32 of each locking member 3 has two through holes 33, and the planetary wheel carrier 1 has two threaded holes 13 at the periphery corresponding to each second shaft hole 12. However, since the side surface 312 of the first part 31 of the locking member 3 is engaged with the axial plane 232 of the limiting portion 23, even if the second part 32 of each locking member 3 is fastened to the planetary wheel carrier 1 by only one fastener 4, relative rotation between the locking member 3, the planetary wheel shaft 2 and the planetary wheel carrier 1 can be prevented. Compared with one fastener 4, the use of two fasteners 4 for each locking member 3 can better prevent relative rotation between the locking member 3 and the planetary wheel carrier 1, thereby preventing relative rotation between the planetary wheel shaft 2 and the planetary wheel carrier 1 through the locking member 3. In other embodiments, the number of fasteners 4 used for each locking member 3 can also be more than three.

[0037] The locking member 3 can also prevent the planetary gear shaft 2 from moving along the radial plane 231 of the limiting portion 23 by abutting the bottom surface 311 of the locking member 3 against the radial plane 231 of the limiting portion 23. Figure 4 In addition, in order to prevent the planetary gear shaft 2 from moving along Figure 4 The second shaft hole 12 is configured as a stepped hole with a step portion 14, and the diameter of the main part of the second shaft hole 12 on the side close to the first shaft hole 11 is smaller than the diameter of the end part on the side away from the first shaft hole 11. Accordingly, the planetary shaft 2 is configured as a stepped shaft, and its second end portion 22 protrudes radially outward to form a shoulder 24. When the planetary shaft 2 is inserted through the second shaft hole 12 and its first end portion 21 is placed in the first shaft hole 11, the shoulder 24 is stopped by the step portion 14 (such as Figure 5 ), which can prevent the planetary gear shaft 2 from continuing to move into the first shaft hole 11.

[0038] The utility model also provides a wheel-side reducer. The wheel-side reducer may include a ring gear (not shown), a sun gear (not shown), a plurality of planetary gears 5 and the planetary wheel shaft positioning structure as described above. The second end plate of the planetary wheel carrier 1 is provided with a central through hole, and the tooth portion of the sun gear passes through the central through hole and is placed between the first end plate and the second end plate of the planetary wheel carrier 1. Each planetary gear 5 is sleeved on the corresponding planetary gear shaft 2 and meshes with the tooth portion of the sun gear. The ring gear is arranged along the outer periphery of the planetary wheel carrier 1 at a position between the first end plate and the second end plate of the planetary wheel carrier 1, so that the tooth portion of the ring gear meshes with each planetary gear 5.

[0039] The wheel-side reducer may also include a housing (not shown), which defines a receiving cavity to at least accommodate the ring gear, the sun gear and the planetary gear 5. The planetary wheel carrier 1 is fixedly connected to the housing via fasteners (such as bolts) passing through connecting holes provided at the periphery of its first end plate. The rim or track of the working machine may be connected to the housing. In some embodiments, the ring gear may be fixed to the housing, and the planetary wheel carrier 1 may be rotatably supported on the housing by bearings and is drivingly connected to a flange for mounting the rim or track.

[0040] The utility model also provides an operating machine, which may include the wheel-side reducer as described above.

[0041] Industrial Applicability

[0042] The planetary wheel shaft positioning structure according to the utility model is particularly suitable for wheel reducers of working machines such as loaders, excavators and bulldozers. However, it should be understood that the planetary wheel shaft positioning structure according to the utility model can also be used in other planetary gear transmission mechanisms.

[0043] by Figures 1 to 7 Taking the illustrated embodiment as an example, when assembling the planetary gear shaft positioning structure, first, two rows of needle rollers 7 and spacer sleeves 8 are installed on the inner wall of the central hole of each planetary gear 5 in a manner known to those skilled in the art. Two washers 6 are placed at the two axial ends of each planetary gear 5, and each planetary gear 5 equipped with needle rollers 7 and spacer sleeves 8 and its two washers 6 are placed at the corresponding positions of the planetary gear carrier 1 through the gap between two adjacent connecting parts of the planetary gear carrier 1.

[0044] Then, each planetary gear shaft 2 is inserted through the corresponding second shaft hole 12 and the corresponding planetary gear 25 on the planetary gear carrier 1 until the shaft shoulder 24 abuts against the step portion 14 of the second shaft hole 12. Thus, each planetary gear 25 is rotatably supported on the corresponding planetary gear shaft 2 via the needle roller 7 and the spacer sleeve 8, respectively.

[0045] Finally, the planetary gear shaft 2 is locked relative to the planetary gear carrier 1 in the axial and circumferential directions by the locking member 3. Specifically, the bottom surface 311 and the side surface 312 of each locking member 3 are respectively abutted against the radial plane 231 and the axial plane 232 of the corresponding limiting portion 23 of the planetary gear shaft 2, and the planetary gear shaft 2 is rotated and adjusted. While keeping the axial plane 232 abutting against the side surface 312 of the locking member 3 and the radial plane 231 abutting against the bottom surface 311 of the locking member 3, the through hole 33 on the locking member 3 is aligned with the corresponding threaded hole 13 on the planetary gear carrier 1. Each fastener 4 is passed through the corresponding through hole 33 on the locking member 3 and threadedly connected with the corresponding threaded hole 13 on the planetary gear carrier 1. Tighten the fastener 4 to complete the assembly of the planetary gear shaft positioning structure.

[0046] In the above embodiment, the limiting portion 23 of the planetary shaft 2 includes an axial plane 232 extending parallel to the axial direction of the planetary shaft 2. In other embodiments, the axial plane 232 can be replaced by a plurality of planes connected at an angle, and accordingly, the side surface 312 corresponding to the first portion 31 of the locking member 3 also includes a plurality of planes connected at an angle.

[0047] As described above, according to the planetary gear shaft positioning structure of the utility model, a limiting portion 23 which is axially recessed from the end face 22 is provided on the end face of the second end portion, the first portion 31 of the locking member 3 is engaged with the limiting portion 23, and the second portion 32 of the locking member 3 is connected to the outer side of the planetary wheel carrier 1 through the fastener 4. In this way, the planetary gear shaft 2 can be limited in the circumferential direction and the axial direction to ensure that the planetary gear shaft 2 does not move or rotate when the wheel-side reducer is working. Compared with the traditional solution that requires machining positioning holes on the surface of the planetary gear shaft to install steel balls, the planetary gear shaft positioning structure according to the utility model is simple to machine and easy to install.

[0048] For those skilled in the art, various modifications and variations may be made to the embodiments disclosed above without departing from the scope or spirit of the utility model. Other embodiments of the utility model will be apparent to those skilled in the art from the practice of the utility model disclosed in this specification. This specification and the examples disclosed therein should be considered to be illustrative only, and the true scope of the utility model is specified by the appended claims and their equivalents.

Claims

1. A planetary gear shaft positioning structure, comprising a planetary gear carrier (1), a plurality of planetary gear shafts (2) and a plurality of locking members (3), characterized in that: The planetary wheel carrier (1) has a plurality of first shaft holes (11) and a plurality of second shaft holes (12) which are arranged opposite to each other along its axial direction; Each of the planetary gear shafts (2) comprises a first end portion (21) disposed in a corresponding first shaft hole (11) and a second end portion (22) disposed in a corresponding second shaft hole (12); Each locking member (3) is configured to be connected to the planetary wheel carrier (1) to limit the position of the corresponding planetary wheel shaft (2); The second end portion (22) is formed with a limiting portion (23) which is recessed axially inwardly from its end surface, and the locking member (3) has a first portion (31) engaged with the limiting portion (23) and a second portion (32) connected to the planetary wheel carrier (1).

2. The planetary gear shaft positioning structure according to claim 1, characterized in that: The limiting portion (23) comprises a radial plane (231) extending perpendicularly to the axial direction of the planetary gear shaft (2), and the first part (31) of the locking member (3) comprises a bottom surface (311) engaged with the radial plane (231).

3. The planetary gear shaft positioning structure according to claim 2, characterized in that: The radial plane (231) is aligned with the outer side surface of the planet wheel carrier (1).

4. The planetary gear shaft positioning structure according to claim 2, characterized in that: The limiting portion (23) comprises an axial plane (232) extending parallel to the axial direction of the planetary gear shaft (2), and the first portion (31) of the locking member (3) comprises a side surface (312) engaged with the axial plane (232).

5. The planetary gear shaft positioning structure according to claim 1, characterized in that: The second part (32) of the locking member (3) is connected to the planetary wheel carrier (1) via a fastener (4).

6. The planetary gear shaft positioning structure according to claim 5, characterized in that: The second portion (32) of each locking member (3) is provided with at least one through hole (33), the planetary wheel carrier (1) is provided with at least one threaded hole (13) at the periphery corresponding to each second shaft hole (12), and the fastener (4) passes through the through hole (33) and is threadedly connected to the planetary wheel carrier (1) in the corresponding threaded hole (13).

7. The planetary gear shaft positioning structure according to claim 6, characterized in that: Each of the locking members (3) has two through holes (33), and the planetary wheel carrier (1) is provided with two threaded holes (13) at the periphery corresponding to each of the second shaft holes (12).

8. The planetary gear shaft positioning structure according to any one of claims 1 to 7, characterized in that: The locking piece (3) is an integrally formed plate-shaped structure.

9. The planetary gear shaft positioning structure according to any one of claims 1 to 7, characterized in that: The second shaft hole (12) is configured as a stepped hole having a step portion (14), the planetary gear shaft (2) is configured as a stepped shaft having a shaft shoulder (24), and the step portion (14) cooperates with the shaft shoulder (24) to limit the position of the planetary gear shaft (2) in the axial direction.

10. A wheel reducer, characterized in that: It comprises a housing, a ring gear, a sun gear, a plurality of planetary gears (5) and a planetary gear shaft positioning structure according to any one of claims 1 to 9, each of the planetary gears (5) is sleeved on the corresponding planetary gear shaft (2) and meshes with the sun gear and the ring gear respectively, the housing defines a receiving cavity for accommodating the ring gear, the sun gear and the planetary gears (5), and the planetary wheel carrier (1) is fixedly connected to the housing on the side opposite to the locking member (3) or is rotatably supported by the housing.

11. A working machine comprising the wheel reducer according to claim 10.

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