Drive axle tail end transmission assembly

Abstract

The utility model provides a drive axle tail end transmission assembly which comprises a steering knuckle shell, a hub shell, a gear ring seat, an inner gear ring, a transmission shaft and a planetary transmission assembly, the steering knuckle shell comprises a first cylindrical connecting part and a steering supporting part, and an inner spline is arranged on the inner surface of the first cylindrical connecting part; the gear ring seat comprises a disc-shaped supporting part fixed to the end of the first barrel-shaped connecting part and a second barrel-shaped connecting part axially extending from the middle of the disc-shaped supporting part, an outer spline is arranged on the outer surface of the second barrel-shaped connecting part and penetrates through the first barrel-shaped connecting part to be matched with the spline of the first barrel-shaped connecting part, and a sun gear is arranged at the end of the transmission shaft. The planetary transmission assembly comprises a planet carrier and a planetary gear meshed with the sun gear and the inner gear ring. The outer spline of the ring seat is meshed with the inner spline of the steering knuckle, then the disc-shaped supporting part is fixed to the end of the first cylindrical connecting part through the bolt, the bolt and the splines jointly bear rotational shear force, the overall strength of the front drive axle is improved, and the bearing capacity is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a drive axle terminal transmission assembly. Background Art

[0002] The existing tractor front drive axle is mainly composed of a front axle housing, left and right terminal transmission assemblies connected to both ends of the front axle housing, a synchronous steering tie rod and a double-acting single oil cylinder. Due to the terminal transmission assembly, the gear ring seat and the steering knuckle housing are fixed by bolts. The position of the gear ring seat and the steering knuckle housing is guaranteed by a positioning sleeve. The bolt passes through the positioning sleeve to fix the gear ring seat to the end of the steering knuckle housing. This fixing method makes the torque shear force borne by the gear ring seat be borne by the positioning sleeve and the bolts. The bearing capacity is average, and the positioning sleeve needs to be cold-installed, and the assembly process is complicated.

[0003] Therefore, it is necessary to provide a drive axle terminal transmission assembly to overcome the above-mentioned defects. Utility Model Content

[0004] The utility model aims to provide a drive axle terminal transmission assembly.

[0005] According to one aspect of the utility model, a drive axle terminal transmission assembly is provided, comprising:

[0006] A steering knuckle housing, the steering knuckle housing comprising a first cylindrical connecting portion and a steering support portion, the inner surface of the first cylindrical connecting portion is provided with an internal spline, and the steering support portion is rotatably connected to the axle housing of the drive axle through a kingpin;

[0007] A wheel hub shell, the wheel hub shell being rotatably disposed on the first cylindrical connecting portion;

[0008] A gear ring seat, the gear ring seat comprising a disc-shaped support portion fixed to the end of the first cylindrical connection portion and a second cylindrical connection portion axially extending from the middle of the disc-shaped support portion, the outer surface of the second cylindrical connection portion is provided with an external spline and is inserted into the first cylindrical connection portion to cooperate with the first cylindrical connection portion spline;

[0009] An inner gear ring, the inner gear ring is supported on the disc-shaped support portion;

[0010] A transmission shaft, the transmission shaft passes through the second cylindrical connecting portion and is transmission-connected to the drive shaft in the bridge housing, and a sun gear is provided at the end of the transmission shaft;

[0011] A planetary transmission assembly comprises a planet carrier fixed to the wheel hub shell and a planetary gear rotatably arranged on the planet carrier and meshing with the sun gear and the inner gear ring.

[0012] Preferably, a first bearing is provided between the transmission shaft and the first cylindrical connecting portion.

[0013] Preferably, the planetary transmission assembly includes a planetary shaft fixed on the planetary carrier, and the planetary gear is arranged at one end of the planetary shaft and is rotatably connected to the planetary shaft via a second bearing.

[0014] Preferably, the steering support portion comprises an upper support arm and a lower support arm, the upper support arm and the lower support arm are both fixed with the kingpin, and the kingpin is rotatably connected to the bridge housing via a third bearing.

[0015] Preferably, a mounting hole is provided on the end surface of the first cylindrical connecting portion, and the mounting hole is a stepped hole. The disc-shaped supporting portion is screwed into the mounting hole by bolts, thereby being fixed to the first cylindrical connecting portion.

[0016] Preferably, the inner gear ring is spline-connected to the radially outer end of the disc-shaped support portion.

[0017] Preferably, the transmission shaft is connected to the drive shaft via a universal joint, a first oil seal is provided between the transmission shaft and the first cylindrical connecting portion, and the first oil seal is located between the first bearing and the universal joint.

[0018] Preferably, the wheel hub shell and the first cylindrical connecting portion are rotatably connected via a fourth bearing, and a second oil seal is provided between the wheel hub shell and the first cylindrical connecting portion.

[0019] Preferably, a third oil seal is provided between the kingpin and the bridge housing.

[0020] Compared with the prior art, the drive axle terminal transmission assembly provided by the utility model has the following beneficial effects:

[0021] Due to the adoption of the above technical scheme, the utility model has the advantages of simple structure, ingenious design and low cost. The external spline of the ring gear seat is meshed with the internal spline of the steering knuckle, and the disc-shaped support part is fixed to the end of the first cylindrical connecting part by bolts. The bolts and the splines jointly bear the rotational shear force, thereby improving the overall strength of the front drive axle, having stronger load-bearing capacity and higher reliability. At the same time, the accuracy of the internal transmission system is improved, and the hidden danger of oil leakage is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 It is a structural schematic diagram of the drive axle terminal transmission assembly of the utility model;

[0024] Figure 2 for Figure 1 A magnified image of point A;

[0025] Figure 3 for Figure 1 Enlarged view of point B.

[0026] Among them, 1. bridge housing, 11. groove, 2. drive shaft, 3. steering knuckle housing, 31. first cylindrical connecting part, 311. mounting hole, 321. upper support arm, 322. lower support arm, 4. wheel hub housing, 5. gear ring seat, 51. disc-shaped support part, 52. second cylindrical connecting part, 6. inner ring gear, 7. transmission shaft, 71. sun gear, 81. planetary carrier, 82. planetary shaft, 83. planetary gear, 9. kingpin, 10. universal joint, 101. first bearing, 102. second bearing, 103. third bearing, 104. fourth bearing, 201. first oil seal, 202. second oil seal, 203. third oil seal. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0029] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0033] See also Figure 1 This embodiment discloses a drive axle terminal transmission assembly, which is located at both ends of the drive axle and is a part of the drive axle. The drive axle terminal transmission assembly of this embodiment includes a steering knuckle housing 3, a wheel hub housing 4, a gear ring seat 5, an inner gear ring 6, a transmission shaft 7 and a planetary transmission assembly 8. The drive axle includes an axle housing 1 and a drive shaft 11 located in the axle housing 1. The steering knuckle housing 3 is arranged at the end of the axle housing 1, and the wheel hub housing 4 is rotatably arranged on the steering knuckle housing 3.

[0034] See also Figure 1 and Figure 3 The knuckle housing 3 includes a first cylindrical connection portion 31 and a steering support portion. The inner surface of the first cylindrical connection portion 31 is provided with an internal spline. The steering support portion is rotatably connected to the axle housing 1 of the drive axle through the kingpin 9. The upper and lower sides of the end of the axle housing 1 are provided with grooves 11 for accommodating the kingpin 9. The steering support portion includes an upper support arm 321 and a lower support arm 322. The upper support arm 321 and the lower support arm 322 are both fixed with the kingpin 9. A third bearing 103 is provided in the groove 11. The kingpin 9 is rotatably connected to the axle housing 1 through the third bearing 103. The kingpin 9 is rotatably connected to the axle housing 1 through the third bearing 103, the rolling friction is small, the steering is smoother, the precision is higher, the load that can be borne is also larger, and the reliability of the steering is improved.

[0035] See also Figure 2The gear ring seat 5 includes a disc-shaped support portion 51 fixed at the end of the first cylindrical connection portion 31 and a second cylindrical connection portion 52 axially extending from the middle of the disc-shaped support portion 51. The outer surface of the second cylindrical connection portion 52 is provided with an external spline and is penetrated in the first cylindrical connection portion 31 to cooperate with the spline of the first cylindrical connection portion 31. A mounting hole 311 is provided on the end surface of the first cylindrical connection portion 31. The mounting hole 311 is a stepped hole. The disc-shaped support portion 51 is screwed into the mounting hole 311 by bolts, thereby being fixed to the first cylindrical connection portion 31. The external spline of the second cylindrical connection portion 52 is meshed with the internal spline of the first cylindrical connection portion 31, and is tightened in the mounting hole 311 by bolts passing through the disc-shaped support portion 51 to complete the fixation of the gear ring seat 5. The bolts and splines can jointly withstand the rotational shear force, with stronger load-bearing capacity and higher reliability.

[0036] The inner gear ring 6 is supported on the disc-shaped support portion 51, and the inner gear ring 6 is spline-connected to the radial outer end of the disc-shaped support portion 51. The transmission shaft 7 passes through the second cylindrical connection portion 52 and the first cylindrical connection portion 31, and is connected to the drive shaft 2 in the bridge housing 1 through a universal joint 10. A sun gear 71 is provided at the end of the transmission shaft 7. A first bearing 101 is provided between the transmission shaft 7 and the first cylindrical connection portion 31, and a rotation connection is performed through the first bearing 101.

[0037] See also Figure 1 The planetary transmission assembly includes a planet carrier 81 fixed to the wheel hub housing 4, a planet shaft 82 fixed to the planet carrier 81, and a planet gear 83 rotatably disposed on the planet shaft 82 and meshing with the sun gear 71 and the inner gear ring 6. The planet gear 83 is disposed at one end of the planet shaft 82 and is rotatably connected to the planet shaft 82 through the second bearing 102. The second bearing 102 of this embodiment adopts a double cone bearing. Compared with the traditional needle roller connection, the planet gear is connected to the planet shaft 82 through the double cone bearing. The structure has a stronger load-bearing capacity and a good lubrication effect, and is easy to assemble.

[0038] A first oil seal 201 is provided between the transmission shaft 7 and the first cylindrical connection part 31, and the first oil seal 201 is located between the first bearing 101 and the universal joint 10. The hub shell 4 and the first cylindrical connection part 31 are rotatably connected through the fourth bearing 104. A second oil seal 202 is provided between the hub shell 4 and the first cylindrical connection part 31. A third oil seal 203 is provided between the kingpin 9 and the bridge housing 1. The multiple oil seal settings can improve the sealing performance of the terminal transmission assembly, have a better mud and water prevention effect, and can perform paddy field operations to a certain extent.

[0039] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A drive axle terminal transmission assembly, characterized in that: include: A steering knuckle housing, the steering knuckle housing comprising a first cylindrical connecting portion and a steering support portion, the inner surface of the first cylindrical connecting portion is provided with an internal spline, and the steering support portion is rotatably connected to the axle housing of the drive axle through a kingpin; A wheel hub shell, the wheel hub shell being rotatably disposed on the first cylindrical connecting portion; A gear ring seat, the gear ring seat comprising a disc-shaped support portion fixed to the end of the first cylindrical connection portion and a second cylindrical connection portion axially extending from the middle of the disc-shaped support portion, the outer surface of the second cylindrical connection portion is provided with an external spline and is inserted into the first cylindrical connection portion to cooperate with the first cylindrical connection portion spline; An inner gear ring, the inner gear ring is supported on the disc-shaped support portion; A transmission shaft, the transmission shaft passes through the second cylindrical connecting portion and is transmission-connected to the drive shaft in the bridge housing, and a sun gear is provided at the end of the transmission shaft; A planetary transmission assembly comprises a planet carrier fixed to the wheel hub shell and a planetary gear rotatably arranged on the planet carrier and meshing with the sun gear and the inner gear ring.

2. The drive axle terminal transmission assembly according to claim 1, characterized in that: A first bearing is provided between the transmission shaft and the first cylindrical connecting portion.

3. The drive axle terminal transmission assembly according to claim 2, characterized in that: The planetary transmission assembly comprises a planetary shaft fixed on the planetary carrier, and the planetary gear is arranged at one end of the planetary shaft and is rotatably connected to the planetary shaft via a second bearing.

4. The drive axle terminal transmission assembly according to claim 3, characterized in that: The steering support portion comprises an upper support arm and a lower support arm, the upper support arm and the lower support arm are both fixed with the kingpin, and the kingpin is rotatably connected to the bridge housing via a third bearing.

5. The drive axle terminal transmission assembly according to claim 4, characterized in that: A mounting hole is provided on the end surface of the first cylindrical connecting portion, and the mounting hole is a stepped hole. The disc-shaped supporting portion is screwed into the mounting hole by bolts, thereby being fixed to the first cylindrical connecting portion.

6. The drive axle terminal transmission assembly according to claim 4, characterized in that: The inner gear ring is spline-connected to the radial outer end of the disc-shaped support portion.

7. The drive axle terminal transmission assembly according to claim 1, characterized in that: The transmission shaft is connected to the drive shaft via a universal joint. A first oil seal is provided between the transmission shaft and the first cylindrical connecting portion. The first oil seal is located between the first bearing and the universal joint.

8. The drive axle terminal transmission assembly according to claim 6, characterized in that: The wheel hub shell and the first cylindrical connecting portion are rotatably connected via a fourth bearing, and a second oil seal is provided between the wheel hub shell and the first cylindrical connecting portion.

9. The drive axle terminal transmission assembly according to claim 8, characterized in that: A third oil seal is provided between the kingpin and the bridge housing.

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