Wheel reducer and operating machinery

Abstract

The utility model relates to a wheel-side reducer and a working machine including the wheel-side reducer. The wheel-side reducer includes a housing, a planetary wheel carrier and a flange. The housing defines a receiving cavity and has an opening at its first end. The planetary wheel carrier is rotatably arranged in the receiving cavity and extends out from the opening. The flange includes a disk body and an inner peripheral wall and an outer peripheral wall respectively extending from the disk body toward the housing. The outer peripheral wall of the flange is sealingly connected to the housing, the planetary wheel carrier is drivingly connected to the inner peripheral wall of the flange, and the disk body is provided with a plurality of circumferentially arranged connection holes for mounting a rim or a track on the side opposite to the housing. The wheel-side reducer of the utility model is arranged outside the rim or the track, which overcomes the problem of high-temperature failure caused by poor heat dissipation, and avoids the problems of limited design space and difficult parts arrangement due to standard specifications of the rim or the track.

Description

Technical Field

[0001] The utility model relates to the technical field of parts of operating machinery, in particular to a wheel-side reducer 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 wheel-side reducer in the prior art, the planetary gear reduction mechanism is accommodated inside the wheel hub for supporting the rim or track, which has poor heat dissipation performance and is prone to failure due to high temperature. In addition, since the specifications of the rim or track have certain standards, the design space of the planetary gear reduction mechanism is limited and sometimes difficult to arrange. 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 wheel-side reducer is provided, which includes a housing, a planetary wheel carrier and a flange. The housing defines a accommodating cavity and has an opening at its first axial end. The planetary wheel carrier is rotatably arranged in the accommodating cavity, and one end thereof extends out of the opening. The flange includes a disc body and an inner circumferential wall and an outer circumferential wall which are concentrically arranged and extend from the disc body toward the housing, respectively. The outer circumferential wall of the flange is sealingly connected to the housing. The portion of the planetary wheel carrier extending out of the opening is drivingly connected to the inner circumferential wall of the flange. The disc body is provided with a plurality of circumferentially arranged connecting holes on the side opposite to the housing, so as to mount the wheel rim or the track on the flange.

[0006] According to one embodiment of the present utility model, the housing has a protruding portion extending between the inner peripheral wall and the outer peripheral wall of the flange, and a first bearing is provided between the protruding portion and the inner peripheral wall.

[0007] According to one embodiment of the present utility model, a second bearing is provided between a portion of the planetary carrier located at the opening and the first end portion of the housing.

[0008] According to one embodiment of the utility model, the wheel-side reducer also includes a pair of floating seals arranged side by side, the shell is provided at its first end with a first sealing groove extending along its circumference and used to install one of the floating seals, and the outer peripheral wall of the flange is provided with a second sealing groove adapted to the first sealing groove and used to install the other floating seal.

[0009] According to an embodiment of the present utility model, each of the floating seals comprises a sealing ring and a sealing seat supporting the sealing ring, and the sealing seat is installed in the first sealing groove or the second sealing groove.

[0010] According to one embodiment of the present utility model, the wheel-side reducer further includes a locking member to axially limit the flange and the planetary wheel carrier.

[0011] According to one embodiment of the utility model, the locking member includes a lock nut and a locking ring, the lock nut is sleeved on the portion of the planetary wheel carrier extending outside the flange, the locking ring is connected to the disk body of the flange, and the inner circumferential shape of the locking ring is adapted to the outer circumferential shape of the lock nut.

[0012] According to one embodiment of the utility model, the wheel-side reducer also includes a ring gear fixedly connected to the second end of the shell in the axial direction, the ring gear is installed in the shell in an interference fit manner, and the ring gear and the second end of the shell are respectively provided with a plurality of half grooves to form a plurality of accommodating portions for positioning pins.

[0013] According to one embodiment of the utility model, the wheel-side reducer also includes a sun gear and a plurality of planetary gear shafts and a plurality of planetary gears arranged at intervals along the circumferential direction. Each of the planetary gears is installed on the planetary wheel carrier via the corresponding planetary gear shaft and is respectively meshed with the ring gear and the sun gear.

[0014] According to another aspect of the utility model, a working machine is provided, which includes a drive axle housing, a half-shaft accommodated in the drive axle housing, and a wheel-side reducer as described above, wherein the housing of the wheel-side reducer is fixedly connected to the drive axle housing, and the rim or track is connected to the flange of the wheel-side reducer on the side opposite to the half-shaft.

[0015] The wheel-side reducer of the utility model is provided with a flange outside the first end of the housing, and the flange has an outer peripheral wall sealed and connected to the housing, an inner peripheral wall drivingly connected to the planetary wheel carrier, and a disc body provided with a plurality of circumferentially arranged connecting holes on the side opposite to the housing. The wheel-side reducer of the utility model arranges the planetary gear reduction mechanism outside the rim or track, overcomes the problem of high-temperature failure caused by poor heat dissipation, and avoids the problem of limited design space and difficult parts arrangement due to the standard specifications of the rim or track. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 A perspective view of a wheel reducer according to an exemplary embodiment of the present utility model is shown.

[0018] Figure 2 An exploded view of the wheel reducer is shown.

[0019] Figure 3 A front view of the wheel reducer is shown.

[0020] Figure 4 The wheel reducer is shown along Figure 3 Sectional view along line AA.

[0021] Figure 5 A three-dimensional view of the housing of the wheel reducer is shown.

[0022] Description of reference numerals:

[0023] 1. Shell; 11. Accommodating chamber; 12. First end; 13. Second end; 14. Opening; 15. Protrusion; 16. First sealing groove; 2. Planetary gear reduction mechanism; 21. Planetary wheel carrier; 22. Ring gear; 23. Sun gear; 24. Planetary wheel shaft; 25. Planetary gear; 26. Locking plate; 3. Flange; 31. Disc body; 311. Connecting hole; 32. Inner circumferential wall; 33. Outer circumferential wall; 331. Second sealing groove; 4. First bearing; 5. Second bearing; 6. Floating seal; 61. Sealing ring; 62. Sealing seat; 7. Locking piece; 71. Lock nut; 72. Locking ring; 8. Half groove; 9. Positioning pin. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] Figures 1 to 4 The wheel reducer according to one embodiment of the utility model is shown. As shown in the figure, the wheel reducer according to this embodiment includes a housing 1, a planetary gear reduction mechanism 2 and a flange 3.

[0027] Figure 5 A perspective view of the housing 1 is further shown. Figure 4 and Figure 5 As shown, the housing 1 defines a housing cavity 11 and includes a first end 12 and a second end 13 located at both ends in the axial direction of the housing 1. The first end 12 has an opening 14, which is formed in the center of the first end 12. The inner diameter of the housing cavity 11 gradually increases as it extends from the first end 12 to the second end 13. In this embodiment, the first end 12 of the housing 1 is further provided with a protrusion 15 extending outwardly along the axial direction of the housing 1 at the outer periphery corresponding to the opening 14. The first end 12 is also formed with a first sealing groove 16 recessed inwardly at the outer periphery corresponding to the protrusion 15. The protrusion 15 and the first sealing groove 16 will be described in detail below.

[0028] According to an exemplary embodiment of the planetary gear reduction mechanism 2, as Figure 1 and Figure 2 As shown, the planetary gear reduction mechanism 2 may include a planetary wheel carrier 21, a ring gear 22, a sun gear 23, a plurality of planetary wheel shafts 24, a plurality of planetary gears 25 and a plurality of locking plates 26. The planetary wheel carrier 21 is rotatably disposed in the accommodating cavity 11, and one end thereof extends out of the opening 14, as shown in FIG. Figure 4As shown. The gear ring 22 is fixedly connected to the second end 13 of the housing 1 and is disposed in the accommodating chamber 11. There may be various ways of fixed connection. For example, in this embodiment, the gear ring 22 is installed in the housing 1 in an interference fit manner. The outer periphery of the gear ring 22 is provided with a plurality of half grooves 8 distributed along its circumference. The second end 12 of the housing 1 is provided with a plurality of half grooves 8 at corresponding positions. The corresponding two half grooves 8 enclose a receiving portion for accommodating the positioning pin 9.

[0029] like Figure 4 As shown, a portion of the sun gear 23 is disposed in the accommodating cavity 11, and another portion extends out of the second end 13 of the housing 1. The planetary carrier 21 is provided with a plurality of mounting positions for mounting the planetary gears 25, and each planetary gear 25 is mounted on the mounting position of the planetary carrier 21 via a corresponding planetary gear shaft 24, so that the planetary gear 25 meshes with the portion of the sun gear 23 disposed in the accommodating cavity 11 and meshes with the ring gear 22.

[0030] The locking plates 26 are arranged in a one-to-one correspondence with the planetary gear shafts 24. Figure 3 A portion of the locking plate 26 is fixedly connected to the planetary wheel carrier 21 (for example, by bolt connection), and another portion is engaged with the planetary wheel shaft 24. Thus, the planetary wheel shaft 24 can be limited relative to the planetary wheel carrier 21 in the circumferential direction and in the axial direction.

[0031] According to an exemplary embodiment of the flange 3, Figure 4 As shown, the flange 3 is coaxially arranged with the housing 1 and includes a disc body 31, an inner peripheral wall 32 and an outer peripheral wall 33. The disc body 31 is annular and extends in the radial direction of the flange 3. A plurality of circumferentially arranged connecting holes 311 are provided on the side of the disc body 31 opposite to the housing 1, and the connecting holes 311 are used to connect the rim or the track. In some specific embodiments, the outer peripheral wall 33 has a certain wall thickness, and the connecting holes 311 can also extend into the outer peripheral wall 33 along the axial direction of the flange 3, such as Figure 4 As shown. The inner peripheral wall 32 extends from the inner peripheral edge of the disc body 31 toward the housing 1. The outer peripheral wall 33 is arranged concentrically with the inner peripheral wall 32 and extends from the outer peripheral edge of the disc body 31 toward the housing 1. The outer peripheral wall 33 is sealed and connected to the first end 12 of the housing 1. The portion of the planetary wheel carrier 21 extending outside the opening 14 is transmission-connected to the inner peripheral wall 31 of the flange 3. When the rim or the track is connected to the connecting hole 311 by a fastener, at least most of the planetary gear reduction mechanism 2 is exposed outside the rim or the track. The outer peripheral wall 33 is provided with a second sealing groove 331 adapted to the first sealing groove 16.

[0032] Furthermore, the protrusion 15 of the housing 1 extends between the inner peripheral wall 32 and the outer peripheral wall 33, so that the protrusion 15 and the inner peripheral wall 32 have an overlapping portion in the axial direction. A first bearing 4 is provided between the protrusion 15 and the inner peripheral wall 32. A second bearing 5 is provided between the portion of the planetary wheel carrier 21 located at the opening 14 and the first end 12 of the housing 1. Combining the first bearing 4 and the second bearing 5 is conducive to supporting the planetary wheel carrier 21, the housing 1 and the flange 3 together on the same axis.

[0033] According to a further embodiment of the wheel reducer, Figure 4 As shown, the wheel reducer may also include a pair of floating seals 6 arranged side by side. One floating seal 6 may be installed in the first sealing groove 16 of the housing 1, and the other floating seal 6 may be installed in the second sealing groove 331 of the flange 3. The two floating seals 6 effectively prevent the leakage of lubricating oil through the tension of the oil film.

[0034] Specifically, each floating seal 6 may include a sealing ring 61 and a sealing seat 62 supporting the sealing ring 61. The sealing seat 62 on the left side is installed in the first sealing groove 16 of the housing 1, and the sealing ring 61 on the left side elastically abuts against the first end 12 of the housing 1 and the sealing seat 62 on the left side. The sealing seat 62 on the right side is installed in the second sealing groove 331 of the flange 3, and the sealing ring 61 on the right side elastically abuts against the outer peripheral wall 33 of the flange 3 and the sealing seat 62 on the right side. The sealing rings 61 on both sides can be restored to their original shape by elastic potential energy so that the two sealing seats 62 on the left and right sides are tightly abutted, thereby preventing the lubricating oil inside the housing 1 and the flange 3 from leaking.

[0035] According to a further embodiment of the wheel reducer, Figure 4 As shown, the wheel-side reducer may also include a locking member 7, by which the flange 3 and the planetary wheel carrier 21 can be limited in the axial direction. Specifically, the portion of the planetary wheel carrier 21 extending out of the opening 14 passes through the flange 3 and is connected to the inner circumferential wall 32 of the flange 3 in a key connection manner, so that the flange 3 can rotate synchronously with the planetary wheel carrier 21, thereby transmitting the torque to the rim or track mounted on the flange 3. The locking member 7 may include a lock nut 71 and a locking ring 72. The lock nut 71 is sleeved on the portion of the planetary wheel carrier 21 extending out of the flange 3. Those skilled in the art should know that the lock nut 71 can be connected to the planetary wheel carrier 21 in any manner. For example, the lock nut 71 may have an internal thread, and the portion of the planetary wheel carrier 21 extending out of the flange 3 may be provided with an external thread, and the lock nut 71 and the planetary wheel carrier 21 are connected in a threaded manner. In addition, one side end face of the lock nut 71 ( Figure 1The left end face of the locking ring 72 (shown in FIG. 1 ) abuts against the outer end face of the disc body 31 of the flange 3, thereby locking the flange 3 and the planetary carrier 21. The inner circumferential shape of the locking ring 72 matches the outer circumferential shape of the lock nut. For example, the locking ring 72 is fastened to the disc body 31 via fasteners (bolts, etc.), thereby preventing the lock nut 71 from loosening in the circumferential direction.

[0036] The utility model also provides a working machine. The working machine may include a drive axle housing, a half shaft contained in the drive axle housing, and a wheel reducer as shown above. The part of the sun gear 23 extending out of the housing 1 may be integrally arranged on the half shaft or be drivingly connected to the half shaft.

[0037] Industrial Applicability

[0038] The wheel reducer according to the utility model is particularly suitable for working machines such as loaders, excavators and bulldozers. However, it should be understood that the wheel reducer according to the utility model can also be used for other equipment that needs to bear a large load and perform deceleration and torque increase.

[0039] by Figures 1 to 5 Taking the embodiment shown as an example, when assembling the wheel reducer, first, press the gear ring 22 into the housing 1 in an interference fit manner, and align the multiple half grooves 8 on the gear ring 22 with the multiple half grooves 8 on the housing 1 one by one, so that the corresponding two half grooves 8 surround and form a complete positioning groove. Insert multiple positioning pins 9 into the positioning grooves one by one to complete the assembly of the gear ring 22 and the housing 1. Assemble the outer ring of the first bearing 4 and the outer ring of the second bearing 5 from both sides of the housing 1 to the first end 12 of the housing 1. Put the sealing ring 61 of the first floating seal assembly 6 together with the sealing seat 62 into the first sealing groove 16 of the housing 1. In this way, the housing assembly is formed.

[0040] Then, multiple planetary gears 25 equipped with needle rollers, spacers and planetary gear washers in a manner known to those skilled in the art are placed at corresponding positions of the planetary gear carrier 21, and multiple planetary gear shafts 24 are passed through corresponding holes on the planetary gear carrier 21 and corresponding planetary gears 25, and fixed to the planetary gear carrier 21 by means of locking plates 26 and fasteners. The inner ring of the second bearing 5 is assembled to the planetary gear carrier 21. The planetary gear carrier assembly thus formed is inserted into the accommodating cavity 11 of the housing 1 from the second end 13 of the housing 1, and one end of the planetary gear carrier 21 is extended from the opening 14 of the housing 1. The end with teeth of the sun gear 23 is inserted into the accommodating cavity 11 and meshes with each planetary gear 25, thereby completing the assembly of the planetary gear reduction mechanism 2 and the housing 1.

[0041] Then, the inner ring of the first bearing 4 is assembled onto the inner peripheral wall 32 of the flange 3, and the sealing ring 61 and the sealing seat 62 of the second floating seal assembly 6 are placed into the second sealing groove 331 of the flange 3, thereby forming a flange assembly.

[0042] Assemble the flange assembly to the first end 12 of the housing 1, and place the planetary wheel carrier assembly into the accommodating cavity 11 of the housing 1 from the second end 13 of the housing 1, so that the inner circumferential wall 31 of the flange 3 is connected to the part of the planetary wheel carrier 21 extending out of the opening 14 in a keyed manner. Screw the lock nut 71 into the part of the planetary wheel carrier 21 extending out of the flange 3, so that it is threadedly connected to the planetary wheel carrier 21. Tighten the lock nut 71 to adjust the first bearing 4, the second bearing 5 and the two floating seal assemblies. Sleeve the locking ring 72 on the outer periphery of the lock nut 71, and connect it to the disc body 31 of the flange 3 via fasteners.

[0043] Finally, the sun gear 23 with the adjusting strut is installed into the planetary carrier assembly from the second end 13 of the housing 1 and meshes with the planetary gears 25, thereby completing the assembly of the wheel reducer.

[0044] As described above, the wheel-side reducer according to the utility model is provided with a flange 3 at the first end 12 of the housing 1, the part of the planetary carrier 21 extending out of the housing 1 is drivingly connected to the inner peripheral wall 32 of the flange 3, the outer peripheral wall 33 of the flange 3 is sealingly connected to the housing 1, and the rim or track can be installed on the disc body 31 of the flange 3 on the side opposite to the housing. Compared with the traditional solution of the rim or track covering the planetary gear reduction mechanism, the wheel-side reducer of the utility model is arranged outside the rim or track, which overcomes the problem of high-temperature failure caused by poor heat dissipation, and avoids the problem of limited design space and difficult parts arrangement due to the standard specifications of the rim or track.

[0045] 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 wheel reducer, characterized in that: include: A housing (1), wherein the housing (1) defines a housing cavity (11) and has an opening (14) at a first end (12) in an axial direction thereof; A planetary wheel carrier (21), the planetary wheel carrier (21) being rotatably disposed in the accommodating cavity (11) and having one end extending out of the opening (14); as well as A flange (3), the flange (3) comprising a disk body (31) and an inner peripheral wall (32) and an outer peripheral wall (33) which are arranged concentrically and extend from the disk body (31) toward the housing (1), The outer peripheral wall (33) of the flange (3) is sealedly connected to the housing (1), the portion of the planetary wheel carrier (21) extending outside the opening (14) is drivingly connected to the inner peripheral wall (32) of the flange (3), and the disc body (31) is provided with a plurality of circumferentially arranged connection holes (311) on the side opposite to the housing (1) for mounting a wheel rim or a track on the flange (3).

2. The wheel reducer according to claim 1, characterized in that: The housing (1) has a protruding portion (15) extending between an inner peripheral wall (32) and an outer peripheral wall (33) of the flange (3), and a first bearing (4) is provided between the protruding portion (15) and the inner peripheral wall (32).

3. The wheel reducer according to claim 1, characterized in that: A second bearing (5) is provided between the portion of the planetary wheel carrier (21) located at the opening (14) and the first end (12) of the housing (1).

4. The wheel reducer according to claim 1, characterized in that: The wheel-side reducer also includes a pair of floating seals (6) arranged side by side, the housing (1) is provided with a first sealing groove (16) extending along its circumference and used to install one of the floating seals (6) at its first end (12), and the outer peripheral wall (33) of the flange (3) is provided with a second sealing groove (331) adapted to the first sealing groove (16) and used to install the other floating seal (6).

5. The wheel reducer according to claim 4, characterized in that: Each of the floating seals (6) comprises a sealing ring (61) and a sealing seat (62) supporting the sealing ring (61), and the sealing seat (62) is installed in the first sealing groove (16) or the second sealing groove (331).

6. The wheel reducer according to claim 1, characterized in that: The wheel-side reducer also includes a locking piece (7) for axially limiting the flange (3) and the planetary wheel carrier (21).

7. The wheel reducer according to claim 6, characterized in that: The locking member (7) comprises a lock nut (71) and a locking ring (72); the lock nut (71) is sleeved on a portion of the planetary wheel carrier (21) extending outside the flange (3); the locking ring (72) is connected to a disk body (31) of the flange (3); and the inner circumference shape of the locking ring (72) is adapted to the outer circumference shape of the lock nut (71).

8. The wheel reducer according to any one of claims 1 to 7, characterized in that: The wheel-side reducer also includes a gear ring (22) fixedly connected to the second end (13) of the housing (1) in the axial direction, and the gear ring (22) is installed in the housing (1) in an interference fit manner. The gear ring (22) and the second end (13) of the housing (1) are respectively provided with a plurality of half grooves (8) to form a plurality of accommodating portions for positioning pins (9).

9. The wheel reducer according to claim 8, characterized in that: The wheel-side reducer also includes a sun gear (23) and a plurality of planetary shafts (24) and a plurality of planetary gears (25) arranged at intervals along the circumferential direction. Each of the planetary gears (25) is mounted on the planetary wheel carrier (21) via the corresponding planetary shaft (24) and is respectively meshed with the ring gear (22) and the sun gear (23).

10. A working machine, characterized in that: It comprises a drive axle housing, a half-shaft accommodated in the drive axle housing, and a wheel-side reducer according to any one of claims 1 to 9, wherein the housing (1) of the wheel-side reducer is fixedly connected to the drive axle housing, and the rim or track is connected to the flange (3) of the wheel-side reducer on the side opposite to the half-shaft.

Images