Drive axle wheel side reducer structure and drive axle

Abstract

The utility model discloses a kind of drive axle wheel edge speed reducer structure and drive axle, drive axle wheel edge speed reducer structure includes axle head, half axle, wheel hub and reducer;The utility model is focused on: reducer includes the reduction shell fixed on wheel hub and the planet carrier, sun gear, a plurality of planetary gears and gear ring in reduction shell, gear ring surrounds the outside of planet carrier and its inner tooth is engaged with a plurality of planetary gears, the inner end of gear ring is integrally extended to form a bracket between the inner end of planet carrier and the outer end of wheel hub, bracket is sleeved on the outer circumferential wall of the axle head.Through the integrated molding of bracket and gear ring, the gear teeth and stop ring engaged with bracket on the inner circumferential wall of gear ring can not be set, to improve structural strength, prevent the failure of reducer due to gear tooth fracture, and eliminate the risk of axial movement of gear ring, and reduce the number of parts of reducer, so that the reducer is simplified in structure while reducing weight.

Description

Technical Field

[0001] This utility model relates to the field of drive axle technology, specifically to a drive axle wheel-side reducer structure and a drive axle. Background Technology

[0002] The wheel-side reducer of a heavy-duty vehicle drive axle includes an axle head, a wheel hub, a half-shaft, and a reducer. The wheel hub is rotatably connected to the axle head, and the half-shaft is located inside the axle head. The reducer includes a reducer housing fixed to the outside of the wheel hub, a bracket, a gear ring, a sun gear, and multiple planetary gears meshing with the sun gear located inside the reducer housing. The bracket is connected to the axle head, and the gear ring is connected to the outer peripheral wall of the bracket through teeth on its inner peripheral wall, with a retaining ring between them. The retaining ring is used to axially limit the gear ring. The sun gear is located inside the gear ring and connected to the half-shaft, and the multiple planetary gears are located inside the gear ring and mesh with it. However, the teeth of the gear ring are prone to breakage under stress, leading to reducer failure and affecting normal use. Utility Model Content

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a drive axle wheel-side reducer structure and drive axle that improves structural strength by integrally extending a bracket inward from the inner end of the gear ring, thereby preventing reducer failure due to tooth breakage and simplifying the structure.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: The drive axle wheel-side reducer structure includes a shaft head, a half shaft disposed in the shaft head, a wheel hub rotatably connected to the outer peripheral wall of the shaft head via a bearing, and a reducer; The reducer includes a reducer housing fixed to the hub and a planet carrier, a sun gear, multiple planetary gears, and a ring gear disposed within the reducer housing. The planet carrier is located outside the hub and is fixedly connected to the reducer housing. The sun gear is located inside the planet carrier and is connected to the outer end of the half-shaft. The multiple planetary gears are rotatably connected inside the planet carrier and surround the outer side of the sun gear, and the multiple planetary gears mesh with the sun gear. The ring gear surrounds the outer side of the planet carrier, and its internal teeth mesh with the multiple planetary gears. The inner end of the ring gear extends inward integrally to form a bracket located between the inner end of the planet carrier and the outer end of the hub. The bracket is sleeved on the outer peripheral wall of the shaft head.

[0005] Furthermore, the inner end of the bracket has an annular mounting portion, the inner peripheral wall of the mounting portion is connected to the outer peripheral wall of the shaft head through a spline, the inner end face of the mounting portion integrally protrudes inward to form an inner protrusion, the inner protrusion abuts against the outer end face of the bearing inner ring at the outer end of the hub, and the outer peripheral wall of the shaft head is also fixed with a limiting piece located outside the outer end face of the mounting portion and abutting against the outer end face of the mounting portion.

[0006] Furthermore, the outer end face of the mounting portion extends outward integrally to form an outer protrusion corresponding to the inner protrusion, and the limiting piece abuts against the outer end face of the outer protrusion.

[0007] Furthermore, the outer peripheral wall of the shaft head is threaded with an outer locking nut and an inner locking nut located inside the outer locking nut. The inner locking nut abuts against the outer end face of the mounting part. The limiting piece is located between the outer locking nut and the inner locking nut and abuts against both the outer locking nut and the inner locking nut.

[0008] Furthermore, an annular positioning plate is formed at the inner end of the planetary carrier. The inner hole of the positioning plate allows the half shaft to pass through, and its inner circumferential wall is recessed outward to form an outer groove. A limiting washer fitted on the outer end of the half shaft is engaged in the outer groove. The inner end face of the sun gear protrudes inward to form a limiting part. The limiting part extends into the inner hole of the positioning plate and abuts against the limiting washer.

[0009] Furthermore, the inner peripheral wall of the inner hole of the positioning plate is recessed outward along the circumferential direction, and the inner groove is located inside the outer groove and a positioning washer is engaged therein, with a gap between the positioning washer and the limiting washer.

[0010] Furthermore, there is a gap between the inner end face of the positioning plate and the outer end face of the shaft head, and the inner peripheral wall of the positioning washer integrally protrudes inward to form a stop block. When viewed in a direction perpendicular to the limiting washer, the projection of the stop block is located on the projection of the limiting washer, so that the stop block stops on the inner side of the limiting washer.

[0011] The drive axle wheel-side reducer structure of this utility model extends inward from the inner end of the gear ring to form a bracket located between the inner end of the planetary carrier and the outer end of the hub. That is, the bracket and the gear ring are integrally formed to form an integral structure, which eliminates the connection structure between the gear ring and the bracket. It is not necessary to set gear teeth and a retaining ring on the inner circumferential wall of the gear ring to mesh with the bracket. On the one hand, it improves the structural strength and can prevent the reducer from failing due to gear tooth breakage. On the other hand, it eliminates the risk of axial movement of the gear ring and reduces the number of parts in the reducer, making the reducer lighter while simplifying the structure.

[0012] This utility model embodiment also provides a drive axle, including the drive axle wheel-side reducer structure described in any of the above embodiments. Attached Figure Description

[0013] Figure 1 This is a partial three-dimensional exploded view of the drive axle wheel-side reducer structure according to an embodiment of the present invention; Figure 2 for Figure 1 A partial 3D exploded view from another perspective; Figure 3 for Figure 1 A sectional view in its combined state; Figure 4 for Figure 3 A magnified view of part A. Detailed Implementation

[0014] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figures 1 to 4 As shown, this utility model embodiment provides a drive axle wheel-side reducer structure, applied to the drive axle of heavy vehicles, including a shaft head 1, a half shaft 2 disposed in the shaft head 1, a wheel hub 4 rotatably connected to the outer peripheral wall of the shaft head 1 via a bearing 3, and a reducer 5.

[0015] like Figure 1 , Figure 2 As shown, the reducer 5 includes a reducer housing 51 fixed to the hub 4, and a planetary carrier 52, a sun gear 53, multiple planetary gears 54, and a ring gear 55 disposed within the reducer housing 51. Specifically, the reducer housing 51 is fitted onto the outer end of the hub 4 and fixedly connected to the flange of the hub 4 by bolts. The planetary carrier 52 is located on the outside of the hub 4 and fixedly connected to the reducer housing 51. Specifically, the planetary carrier 52 surrounds the outer end of the half-shaft 2 and is integrally formed with the reducer housing 51, and it extends integrally inward from the inner wall of the outer end of the reducer housing 51. Figure 4 As shown, an annular positioning plate 521 is formed at the inner end of the planetary carrier 52. There is a gap between the inner end face of the positioning plate 521 and the outer end face of the shaft head 1, which forms a clearance space to prevent the positioning plate 521 from interfering with the shaft head 1. The inner hole 5211 of the positioning plate 521 allows the half shaft 2 to pass through, and its inner peripheral wall is recessed outward along the circumference to form an outer retaining groove 5212. A limiting washer 5213 is fitted in the outer retaining groove 5212 and sleeved on the outer end of the half shaft 2. The inner end face of the sun gear 53 protrudes inward along the circumference to form a limiting part 531. The limiting part 531 extends into the inner hole 5211 of the positioning plate and abuts against the limiting washer 5213, so that the limiting washer 5213 axially limits the sun gear 53.

[0016] like Figure 4As shown, to improve positioning stability, in this embodiment, the inner peripheral wall of the inner hole 5211 of the positioning plate is further recessed outward in the circumferential direction with an inner groove 5214. The inner groove 5214 is located inside the outer groove 5212 and a positioning washer 5215 is engaged within it. There is a gap between the positioning washer 5215 and the limiting washer 5213 to facilitate installation. By setting the positioning washer 5215, the limiting washer 5213 can be positioned axially to prevent axial movement of the limiting washer 5213. To further save space and improve positioning stability, in this embodiment, the inner peripheral wall of the positioning washer 5215 integrally protrudes inward to form a stop 5216. When viewed in a direction perpendicular to the limiting washer 5213, the projection of the stop 5216 is located at the projection of the limiting washer 5213, so that the stop 5216 stops inside the limiting washer 5213.

[0017] like Figure 1 , Figure 4 As shown, the sun gear 53 is located inside the planet carrier 52 and is connected to the outer end of the half-shaft 2 via a spline (not shown). Multiple planetary gears 54 are rotatably connected inside the planet carrier 52 and surround the outer side of the sun gear 53, meshing with the sun gear 53. A gear ring 55 surrounds the outer side of the planet carrier 52, and its internal teeth 551 mesh with the multiple planetary gears 54. The inner end of the gear ring 55 extends inward integrally to form a bracket 56 located between the inner end of the planet carrier 52 and the outer end of the hub 4 (e.g., ...). Figure 2 , Figure 3 As shown, bracket 56 is fitted onto the outer peripheral wall of shaft head 1. By integrally molding bracket 56 and gear ring 55 to form an integral structure, the connection structure between gear ring 55 and bracket 56 is eliminated. It is not necessary to provide gear teeth and retaining rings that mesh with bracket 56 on the inner peripheral wall of gear ring 55. On the one hand, it improves the structural strength and prevents the reducer 5 from failing due to gear tooth breakage. On the other hand, it eliminates the risk of axial movement of gear ring 55, improves positioning stability, and reduces the number of parts in reducer 5, making reducer 5 lighter while simplifying its structure.

[0018] like Figure 3 , Figure 4As shown, the inner end of the bracket 56 has an annular mounting portion 561. The inner peripheral wall of the mounting portion 561 is connected to the outer peripheral wall of the shaft head 1 via a spline. Specifically, both the inner peripheral wall of the mounting portion 561 and the outer peripheral wall of the shaft head 1 are provided with splines, and the splines of the two are mutually engaged. The inner end face of the mounting portion 561 integrally protrudes inward to form an inner protrusion 5611. The inner protrusion 5611 abuts against the outer end face of the inner ring of the bearing 3 at the outer end of the hub 4 to axially limit the bearing 3. The outer peripheral wall of the shaft head 1 is also fixed with a limiting piece 11 located outside the outer end face of the mounting portion 561 and abutting against the outer end face of the mounting portion 561. The limiting piece 11 is used to axially limit the bracket 56 and prevent the bracket 56 from axially moving. In order to improve the structural strength, the outer end face of the mounting portion 561 integrally extends outward corresponding to the inner protrusion 5611 to form an outer protrusion 5612. The limiting piece 11 abuts against the outer end face of the outer protrusion 5612.

[0019] like Figure 3 , Figure 4 As shown, to improve positioning stability, an outer locking nut 12 and an inner locking nut 13 located inside the outer locking nut 12 are threaded onto the outer peripheral wall of the shaft head 1. The inner locking nut 13 abuts against the outer end face of the mounting part 561. The limiting piece 11 is located between the outer locking nut 12 and the inner locking nut 13 and abuts against both the outer locking nut 12 and the inner locking nut 13. The inner locking nut 13 and the outer locking nut 12 can axially lock the bracket 56, making the bracket 56 stably positioned and preventing axial movement of the bracket 56.

[0020] The drive axle wheel-side reducer structure of this utility model extends inward from the inner end of the gear ring to form a bracket located between the inner end of the planetary carrier and the outer end of the hub. That is, the bracket and the gear ring are integrally formed to form an integral structure, which eliminates the connection structure between the gear ring and the bracket. It is not necessary to set gear teeth and a retaining ring on the inner circumferential wall of the gear ring to mesh with the bracket. On the one hand, it improves the structural strength and can prevent the reducer from failing due to gear tooth breakage. On the other hand, it eliminates the risk of axial movement of the gear ring and reduces the number of parts in the reducer, making the reducer lighter while simplifying the structure.

[0021] This utility model embodiment also provides a drive axle (not shown), which includes the drive axle wheel-side reducer structure described in any of the above embodiments.

[0022] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A drive axle wheel-side reducer structure, characterized in that, It includes a shaft head, a half shaft disposed within the shaft head, a hub rotatably connected to the outer peripheral wall of the shaft head via a bearing, and a reducer; The reducer includes a reducer housing fixed to the hub and a planet carrier, a sun gear, multiple planetary gears, and a ring gear disposed within the reducer housing. The planet carrier is located outside the hub and is fixedly connected to the reducer housing. The sun gear is located inside the planet carrier and is connected to the outer end of the half-shaft. The multiple planetary gears are rotatably connected inside the planet carrier and surround the outer side of the sun gear, and the multiple planetary gears mesh with the sun gear. The ring gear surrounds the outer side of the planet carrier, and its internal teeth mesh with the multiple planetary gears. The inner end of the ring gear extends inward integrally to form a bracket located between the inner end of the planet carrier and the outer end of the hub. The bracket is sleeved on the outer peripheral wall of the shaft head.

2. The drive axle wheel-side reducer structure as described in claim 1, characterized in that, The inner end of the bracket has an annular mounting portion. The inner peripheral wall of the mounting portion is connected to the outer peripheral wall of the shaft head via a spline. The inner end face of the mounting portion integrally protrudes inward to form an inner protrusion. The inner protrusion abuts against the outer end face of the bearing inner ring at the outer end of the hub. The outer peripheral wall of the shaft head is also fixed with a limiting piece located outside the outer end face of the mounting portion and abutting against the outer end face of the mounting portion.

3. The drive axle wheel-side reducer structure as described in claim 2, characterized in that, The outer end face of the mounting part extends outward integrally to form an outer protrusion corresponding to the inner protrusion, and the limiting piece abuts against the outer end face of the outer protrusion.

4. The drive axle wheel-side reducer structure as described in claim 2, characterized in that, The outer peripheral wall of the shaft head is threaded with an outer locking nut and an inner locking nut located inside the outer locking nut. The inner locking nut abuts against the outer end face of the mounting part. The limiting piece is located between the outer locking nut and the inner locking nut and abuts against both the outer locking nut and the inner locking nut.

5. The drive axle wheel-side reducer structure as described in claim 1, characterized in that, The planetary carrier has an annular positioning plate at its inner end. The inner hole of the positioning plate allows the half shaft to pass through, and its inner circumferential wall is recessed outward to form an outer groove. A limiting washer fitted on the outer end of the half shaft is engaged in the outer groove. The inner end face of the sun gear protrudes inward to form a limiting part, which extends into the inner hole of the positioning plate and abuts against the limiting washer.

6. The drive axle wheel-side reducer structure as described in claim 5, characterized in that, The inner circumferential wall of the inner hole of the positioning plate is recessed outward along the circumferential direction, and the inner groove is located inside the outer groove and a positioning washer is engaged therein. There is a gap between the positioning washer and the limiting washer.

7. The drive axle wheel-side reducer structure as described in claim 6, characterized in that, There is a gap between the inner end face of the positioning plate and the outer end face of the shaft head. The inner peripheral wall of the positioning washer integrally protrudes inward to form a stop block. When viewed in a direction perpendicular to the limiting washer, the projection of the stop block is located at the projection of the limiting washer, so that the stop block stops on the inner side of the limiting washer.

8. A drive axle, characterized in that, Includes the drive axle wheel-side reducer structure as described in any one of claims 1 to 7.

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