Wheel-side speed reduction structure

Abstract

The utility model provides a hub reduction structure which comprises a side reduction shell, an inner gear ring and a planetary transmission assembly, the side reduction shell comprises a tail end transmission shell and an end cover, the inner gear ring is fixed with the tail end transmission shell, the planetary transmission assembly comprises a planetary carrier, a gear shaft and a planetary gear, and the planetary carrier comprises a driving part and a mounting part. The mounting part comprises a first mounting plate, a second mounting plate and an annular boss, the annular boss is connected with the tail end transmission shell through a second bearing, and the annular boss is sleeved with the second bearing; the gear shaft is arranged on the first mounting plate and the second mounting plate in a penetrating mode, one end of the gear shaft abuts against the first bearing, a limiting notch for containing the second bearing is formed in the other end of the gear shaft, the second bearing is arranged in the limiting notch and abuts against the gear shaft, and the gear shaft is limited to rotate around the axis of the gear shaft while being limited to move in the radial direction. And the reliability and high efficiency of matched rotation of the planetary gear, the inner gear ring and the sun gear are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor drive axles, in particular to a wheel-side speed reduction structure. Background Art

[0002] like Figure 1 As shown, in the prior art, a planetary transmission mechanism is provided inside the wheel-side reducer on the drive axle, including a planet carrier 1', a gear shaft 2' and a planetary gear 3', wherein the gear shaft 2' is limited in freedom by an elastic pin 4', specifically, pin holes 5' are processed on the planet carrier 1' and the gear shaft 2', and the elastic pin 4' is inserted into the pin holes 5' of the two to limit the axial movement and rotation of the gear shaft 2'. Although this method is effective, the processing and assembly process is complicated, the cost is high, and it occupies a large space.

[0003] Therefore, it is necessary to provide a wheel-side reduction structure to overcome the above-mentioned defects. Utility Model Content

[0004] The utility model aims to provide a wheel-side speed reduction structure.

[0005] According to one aspect of the utility model, a wheel-side reduction structure is provided, comprising:

[0006] An edge reduction housing, the edge reduction housing comprising a terminal transmission housing and an end cover fixed to the outside of the terminal transmission housing;

[0007] A vertical shaft, the vertical shaft is arranged in the terminal transmission housing, and the vertical shaft is drivingly connected to the driving shaft in the driving axle;

[0008] An inner gear ring, the inner gear ring is fixed to the terminal transmission housing;

[0009] A planetary transmission assembly, wherein the planetary transmission assembly is arranged in the edge reduction housing, the planetary transmission assembly comprises a planet carrier, a plurality of gear shafts and a plurality of planetary gears, the planetary gears are rotatably fixed on the planet carrier through the gear shafts and mesh with the inner gear ring, the planet carrier comprises a cylindrical axially extending driving portion and a mounting portion for mounting the gear shaft, the driving portion is connected to the end cover through a first bearing, the mounting portion comprises a first mounting plate arranged close to the driving portion, a second mounting plate arranged away from the driving portion and an annular boss extending from the second mounting plate to a direction away from the first mounting plate, the annular boss is connected to the terminal transmission housing through a second bearing, and the second bearing is sleeved on the annular boss;

[0010] The gear shaft is inserted through the first mounting plate and the second mounting plate, one end of the gear shaft abuts against the first bearing, the other end of the gear shaft is provided with a limiting notch for accommodating the second bearing, the second bearing is placed in the limiting notch and abuts against the gear shaft, and limits the gear shaft from rotating around its own axis;

[0011] A secondary driven gear, the secondary driven gear is drivingly connected to the vertical shaft and is rotationally connected to the mounting portion;

[0012] A side shaft, one end of which is inserted into the secondary driven gear, and the other end of which is provided with a sun gear meshing with the planetary gear.

[0013] Preferably, a plurality of first mounting holes are provided on the first mounting plate around the circumference of the driving part, a second mounting hole is provided on the second mounting plate coaxially with the corresponding first mounting hole, and the gear shaft is passed through the corresponding first mounting hole and the second mounting hole.

[0014] Preferably, the second mounting hole transversely penetrates the annular boss, a projection of the second mounting hole on the second mounting plate partially overlaps with a projection of the annular boss on the second mounting plate, and the second mounting hole forms an opening radially outside the annular boss.

[0015] Preferably, the axial end face of the limiting notch abuts against the side face of the inner ring of the second bearing, the upper surface of the limiting notch of the gear shaft is an arc surface and forms a complete cylindrical surface with the outer surface of the annular boss for the inner ring of the second bearing to be sleeved, and the inner surface of the inner ring of the second bearing is fitted with the upper surface of the limiting notch and the outer surface of the annular boss.

[0016] Preferably, the end of the gear shaft close to the first bearing is provided with a flange abutting against the side surface of the inner ring of the first bearing, and the end surface of the limiting notch abuts against the side surface of the inner ring of the second bearing.

[0017] Preferably, the secondary driven gear is connected to the mounting portion via a third bearing, a support hole is provided in the middle of the second mounting plate, the third bearing is provided in the support hole, and one end of the secondary driven gear is supported in the support hole via the third bearing.

[0018] Preferably, the driving part is perpendicular to the first mounting plate and extends outward from the middle of the first mounting plate, the driving part is sleeved with a front hub, the front hub is spline-connected to the driving part, and the inner ring portion of the first bearing is sleeved on the front hub.

[0019] Preferably, the secondary driven gear is connected to the terminal transmission housing via a fourth bearing, and the fourth bearing and the third bearing are respectively located on both sides of the axial direction of the secondary driven gear.

[0020] Preferably, the inner gear ring is fixed between the end cover and the terminal transmission housing.

[0021] Preferably, the planetary gear is supported on the gear shaft through a plurality of needle rollers and is located between the first mounting plate and the second mounting plate.

[0022] Compared with the prior art, the wheel-side reduction structure provided by the utility model has the following beneficial effects:

[0023] Due to the adoption of the above technical scheme, the utility model has the advantages of simple structure, ingenious design and low cost. The radial movement of the gear shaft is limited by the arrangement of the first bearing and the second bearing. The second bearing is sleeved on the limiting boss and is located in the limiting notch. Since the limiting notch is fitted and tightly connected with the inner ring of the second bearing, the rotation of the gear shaft itself in the first mounting hole and the second mounting hole is limited, thereby ensuring the reliability and efficiency of the coordinated rotation of the planetary gears, the inner ring gear and the sun gear. Compared with the prior art, the axial thickness of the planetary carrier is also reduced, the internal arrangement is compact, the internal space is saved, and the processing and assembly process are simple, saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0025] Figure 1 It is a structural schematic diagram of a wheel-side reduction structure of the prior art;

[0026] Figure 2 It is a structural schematic diagram of the wheel-side reduction structure of the utility model;

[0027] Figure 3 for Figure 2 A magnified image of point A;

[0028] Figure 4 It is a three-dimensional diagram of the planetary transmission assembly of the utility model;

[0029] Figure 5 It is a front view of the planetary transmission assembly of the utility model;

[0030] Figure 6 A three-dimensional diagram of a planet carrier of the utility model;

[0031] Figure 7 It is a three-dimensional diagram of the gear shaft of the present utility model.

[0032] Among them, 1'. planet carrier, 2'. gear shaft, 3'. planet gear, 4'. elastic pin, 5'. pin hole;

[0033] 1. Side reduction housing, 11. Terminal transmission housing, 111. Middle housing, 1111. Support block, 112. Upper housing, 12. End cover, 2. Vertical shaft, 21. First bevel gear, 22. Second bevel gear, 3. Internal gear ring, 4. Planetary transmission assembly, 41. Planet carrier, 411. Driving part, 412. Mounting part, 4121. First mounting plate, 4122. Second mounting plate, 4123. Annular boss, 4124. 1. Mounting hole, 4125. 2. Mounting hole, 4126. Support hole, 42. Gear shaft, 421. Limiting notch, 422. Flange, 43. Planetary gear, 44. Needle roller, 5. Secondary driven gear, 6. Side shaft, 61. Sun gear, 7. Front wheel hub, 8. Drive axle housing, 9. Drive shaft, 91. Active bevel gear, 101. 1. First bearing, 102. 2. Second bearing, 103. 3. Bearing, 104. 4. Bearing. DETAILED DESCRIPTION

[0034] 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.

[0035] 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".

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] See also Figure 2 , this embodiment discloses a wheel-side reduction structure, which is located on both sides of the drive axle, and the drive axle transmits power to the wheel-side reduction structure through the drive shaft 9. The wheel-side reduction structure of this embodiment includes a side reduction housing 1, a vertical shaft 2, an inner ring 3, a planetary transmission assembly 4, a secondary driven gear 5 and a side shaft 6. The side reduction housing 1 includes an end transmission housing 11 and an end cover 12 fixed to the outside of the end transmission housing 11, wherein the end transmission housing 11 is composed of a middle housing 111 and an upper housing 112. One side of the middle housing 111 is fixed to the end cover 12, and the upper housing 112 is fixed above the other side, and the drive axle housing 8 is fixed to the middle housing 111 and the upper housing 112 at the same time.

[0041] The vertical shaft 2 is tiltedly arranged in the terminal transmission housing 11, that is, the upper part of the vertical shaft 2 is located in the upper housing 112, and the lower part is located in the middle housing 111. The vertical shaft 2 is transmission-connected with the drive shaft 9 in the drive axle housing 8. The end of the drive shaft 9 close to the wheel-side reduction structure is provided with a driving bevel gear 91, and the vertical shaft 2 is provided with a first bevel gear 21 meshing with the driving bevel gear 91 and a second bevel gear 22 located below the first bevel gear 21 and meshing with the secondary driven gear 5.

[0042] The inner gear ring 3 is fixed to the terminal transmission housing 11. In this embodiment, the inner gear ring 3 is fixed between the end cover 12 and the middle housing 111. The fastening bolts pass through the outer edge of the end cover 12 and the inner gear ring 3 in sequence and are screwed into the outer edge of the middle housing 111 to fix the end cover 12, the inner gear ring 3 and the middle housing 111.

[0043] See also Figure 2 and Figure 3The planetary transmission assembly 4 is arranged in the side reduction housing 1, and the planetary transmission assembly 4 includes a planetary carrier 41, a plurality of gear shafts 42 and a plurality of planetary gears 43. The planetary gears 43 are rotatably fixed on the planetary carrier 41 through the gear shafts 42 and mesh with the inner gear ring 3. The planetary carrier 41 includes a cylindrical axially extending driving portion 411 and a mounting portion 412 for mounting the gear shaft 42. The driving portion 411 is connected to the end cover 12 through the first bearing 101, and the mounting portion 412 is connected to the middle housing 111 through the second bearing 102.

[0044] See also Figure 4 and Figure 6 The installation 412 includes a first mounting plate 4121 disposed near the driving portion 411, a second mounting plate 4122 disposed away from the driving portion 411, and an annular boss 4123 extending from the second mounting plate 4122 to a direction away from the first mounting plate 4121. The driving portion 411 is perpendicular to the first mounting plate 4121 and extends outward from the middle of the first mounting plate 4121. The driving portion 411 is sleeved with a front wheel hub 7, and the front wheel hub 7 is spline-connected with the driving portion 411. Further, the inner ring portion of the first bearing 101 is sleeved on the front wheel hub 7, and the inner ring of the second bearing 102 is sleeved on the annular boss 4123.

[0045] See also Figure 3 , Figure 4 , Figure 6 and Figure 7 The first mounting plate 4121 is provided with a plurality of first mounting holes 4124 in the circumferential direction around the driving part 411, and the second mounting plate 4122 is provided with a second mounting hole 4125 corresponding to the first mounting hole 4124, and the corresponding second mounting hole 4125 is coaxially arranged with the first mounting hole 4124. The gear shaft 42 is inserted into the corresponding first mounting hole 4124 and the second mounting hole 4125, and the planetary gear 43 is supported on the gear shaft 42 through a plurality of needle rollers 44 and is located between the first mounting plate 4121 and the second mounting plate 4122. One end of the gear shaft 42 abuts against the first bearing 101, and the other end of the gear shaft 42 is provided with a limiting notch 421 for accommodating the second bearing 402, and the second bearing 102 is placed in the limiting notch 421 and abuts against the gear shaft 42.

[0046] Furthermore, the end of the gear shaft 42 close to the first bearing 101 is provided with a flange 422 that abuts against the inner ring side of the first bearing 101, and the axial end face of the limiting notch 421 abuts against the inner ring side of the second bearing 102. The inner surface of the middle housing 111 is provided with a step portion, and the outer ring side of the second bearing 102 abuts against the end face of the step portion. The freedom of axial movement of the gear shaft 42 is limited, and the freedom of rotation around its own axis is also limited.

[0047] See also Figure 5 and Figure 6 , the second mounting hole 4125 passes through the annular boss 4123 transversely, a part of the projection of the second mounting hole 4125 on the second mounting plate 4122 overlaps with the projection of the annular boss 4123 on the second mounting plate 4122, and a part of the projection is located outside the projection of the annular boss 4123 on the second mounting plate 4122, that is, the projections of the two only partially overlap. The second mounting hole 4125 forms an opening on the radial outer side of the annular boss 4123. One end of the gear shaft 42 extends into the annular boss 4123 through the second mounting hole 4125, and the upper surface of the limiting notch 421 of the gear shaft 42 is an arc surface and forms a complete cylindrical surface with the outer surface of the annular boss 4123, for the inner ring of the second bearing 102 to be sleeved. The inner surface of the inner ring of the second bearing 102 is fitted with the upper surface of the limiting notch 421 and the outer surface of the annular boss 4123 to prevent the gear shaft 42 from rotating around its own axis.

[0048] The secondary driven gear 5 is connected to the mounting portion 412 through the third bearing 103, and is connected to the middle housing 111 through the fourth bearing 104. The fourth bearing 104 and the third bearing 103 are respectively located on both sides of the axial direction of the secondary driven gear 5. A support hole 4126 is provided in the middle of the second mounting plate 4122, and the third bearing 103 is provided in the support hole 4126. One end of the secondary driven gear 5 is supported in the support hole 4126 through the third bearing 103. A support block 1111 is axially extended in the middle housing 111 and is coaxially arranged with the side shaft 6. The fourth bearing 104 is sleeved on the support block 1111 to support the secondary driven gear 5.

[0049] One end of the side shaft 6 is inserted into the secondary driven gear 5, and the other end of the side shaft 6 is provided with a sun gear 61 meshing with the planetary gear 43. The power is transmitted from the drive axle to the vertical shaft 2 through the drive shaft 9, and then transmitted to the front wheel hub 7 through the secondary driven gear 5, the side shaft 6, the sun gear 61, the planetary gear 43, and the planetary carrier 41 in sequence, thereby driving the front wheel hub 7 to rotate.

[0050] The arrangement of the first bearing 101 and the second bearing 102 limits the radial movement of the gear shaft 42. The second bearing 102 is sleeved on the limiting boss 4123 and is located in the limiting notch 421. Since the limiting notch 421 is fitted and tightly connected to the inner ring of the second bearing 102, the rotation of the gear shaft 42 itself in the first mounting hole 4124 and the second mounting hole 4125 is limited, thereby ensuring the reliability and efficiency of the coordinated rotation of the planetary gear 43, the inner ring gear 3 and the sun gear 61.

[0051] 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 wheel-side reduction structure, characterized in that: include: An edge reduction housing, the edge reduction housing comprising a terminal transmission housing and an end cover fixed to the outside of the terminal transmission housing; A vertical shaft, the vertical shaft is arranged in the terminal transmission housing, and the vertical shaft is drivingly connected to the driving shaft in the driving axle; An inner gear ring, the inner gear ring is fixed to the terminal transmission housing; A planetary transmission assembly, wherein the planetary transmission assembly is arranged in the edge reduction housing, the planetary transmission assembly comprises a planet carrier, a plurality of gear shafts and a plurality of planetary gears, the planetary gears are rotatably fixed on the planet carrier through the gear shafts and mesh with the inner gear ring, the planet carrier comprises a cylindrical axially extending driving portion and a mounting portion for mounting the gear shaft, the driving portion is connected to the end cover through a first bearing, the mounting portion comprises a first mounting plate arranged close to the driving portion, a second mounting plate arranged away from the driving portion and an annular boss extending from the second mounting plate to a direction away from the first mounting plate, the annular boss is connected to the terminal transmission housing through a second bearing, and the second bearing is sleeved on the annular boss; The gear shaft is inserted through the first mounting plate and the second mounting plate, one end of the gear shaft abuts against the first bearing, the other end of the gear shaft is provided with a limiting notch for accommodating the second bearing, the second bearing is placed in the limiting notch and abuts against the gear shaft, and limits the gear shaft from rotating around its own axis; A secondary driven gear, the secondary driven gear is drivingly connected to the vertical shaft and is rotationally connected to the mounting portion; A side shaft, one end of which is inserted into the secondary driven gear, and the other end of which is provided with a sun gear meshing with the planetary gear.

2. The wheel-side reduction structure according to claim 1, characterized in that: The first mounting plate is provided with a plurality of first mounting holes around the circumference of the driving part, the second mounting plate is provided with a second mounting hole coaxially arranged with the corresponding first mounting hole, and the gear shaft is passed through the corresponding first mounting hole and the second mounting hole.

3. The wheel-side reduction structure according to claim 2, characterized in that: The second mounting hole transversely penetrates the annular boss, a projection of the second mounting hole on the second mounting plate partially overlaps with a projection of the annular boss on the second mounting plate, and the second mounting hole forms an opening radially outside the annular boss.

4. The wheel-side reduction structure according to claim 3, characterized in that: The axial end face of the limiting notch abuts against the side face of the inner ring of the second bearing, the upper surface of the limiting notch of the gear shaft is an arc surface and forms a complete cylindrical surface with the outer surface of the annular boss for the inner ring of the second bearing to be sleeved, and the inner surface of the inner ring of the second bearing is fitted with the upper surface of the limiting notch and the outer surface of the annular boss.

5. The wheel-side reduction structure according to claim 4, characterized in that: The end of the gear shaft close to the first bearing is provided with a flange that abuts against the side surface of the inner ring of the first bearing, and the end surface of the limiting notch abuts against the side surface of the inner ring of the second bearing.

6. The wheel-side reduction structure according to claim 5, characterized in that: The secondary driven gear is connected to the mounting portion via a third bearing, a support hole is provided in the middle of the second mounting plate, the third bearing is arranged in the support hole, and one end of the secondary driven gear is supported in the support hole via the third bearing.

7. The wheel-side reduction structure according to claim 6, characterized in that: The driving part is perpendicular to the first mounting plate and extends outward from the middle of the first mounting plate. A front wheel hub is sleeved on the driving part. The front wheel hub is spline-connected to the driving part. The inner ring of the first bearing is sleeved on the front wheel hub.

8. The wheel-side reduction structure according to claim 7, characterized in that: The secondary driven gear is connected to the terminal transmission housing via a fourth bearing, and the fourth bearing and the third bearing are respectively located on both sides of the axial direction of the secondary driven gear.

9. The wheel-side reduction structure according to claim 8, characterized in that: The inner gear ring is fixed between the end cover and the terminal transmission housing.

10. The wheel-side reduction structure according to claim 9, characterized in that: The planetary gear is supported on the gear shaft through a plurality of needle rollers and is located between the first mounting plate and the second mounting plate.

Images