wheel-side reduction gear

Abstract

The application discloses a wheel-side speed reducer, which comprises a side reduction box provided with a planetary gear speed reduction mechanism, wherein the side reduction box comprises a side reduction box body, a first side reduction box cover and a second side reduction box cover; the side reduction box body is fixedly connected with a knuckle shell; a gear ring is fixed in the side reduction box body; an outer planetary gear carrier is provided with a shaft head; the shaft head is rotatably installed on the first side reduction box cover through a first bearing; an inner planetary gear carrier is rotatably installed on the second side reduction box cover through a second bearing; a sun gear shaft is rotatably installed on the outer planetary gear carrier through a third bearing and rotatably installed on the inner planetary gear carrier through a fourth bearing. The wheel-side speed reducer has high assembly precision and is convenient to install and maintain; the air is discharged upward through a vent plug, the air pressure is reduced, pollution to a paddy field is avoided, and a conventional planetary speed reduction paddy field bridge is upgraded to a water and drought dual-purpose bridge.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wheel-side reducer, in particular to a wheel-side reducer used on a drive axle or a steering drive axle. BACKGROUND

[0002] The drive axle or the steering drive axle is at the end of the power transmission system of a self-propelled working machine (including tractor, field working machine, etc.) or vehicle (including agricultural vehicle, engineering vehicle, transport vehicle, etc.), and its basic functions are: transmitting the torque output by the engine to the wheel-side reducer through the main reducer, differential, half shaft, etc. to drive the wheels, realize speed reduction and torque increase, and the steering drive axle makes the self-propelled working machine or vehicle turn through the steering mechanism; changing the direction of torque transmission through the main reducer bevel gear pair; realizing differential action of the two sides of the wheels through the differential to ensure that the inner and outer wheels turn at different speeds; and realizing load bearing and torque transmission through the axle housing and the wheels.

[0003] The planetary reduction mechanism has large speed ratio, compact structure, and large transmission torque, and is often used as a wheel-side reducer. The planetary gear reducer usually includes a sun gear shaft, a planetary gear carrier, and a ring gear. The planetary gear carrier is fixedly connected with the wheel hub, the wheel hub is rotatably installed in the knuckle housing through a conical roller bearing, and the ring gear is fixed to the knuckle housing through a threaded connecting piece. The above structure has the following technical defects:

[0004] Firstly, the ring gear needs to be connected with the knuckle housing through a threaded connecting piece, and the coaxiality of the sun gear shaft, the planetary gear carrier, and the ring gear is difficult to guarantee, and the assembly process is complicated.

[0005] Secondly, the planetary gear carrier serves as an end cover of the planetary reduction mechanism, and due to the size limitation, it is difficult to adapt to different specifications of the steel ring.

[0006] Thirdly, in the steering drive axle, on the one hand, the wheel hub is rotatably installed in the knuckle housing, and a dynamic seal needs to be arranged between the wheel hub and the knuckle housing, which is easy to leak oil; on the other hand, since the sun gear shaft of the planetary reduction mechanism is not fixed in the axial direction, when the knuckle housing swings, the sun gear shaft will be pulled in the axial direction, thereby increasing the wear of the oil seal between the sun gear shaft and the knuckle housing, and it is also easy to leak oil. During water field operation, oil stains will pollute the water field.

[0007] The utility model discloses a kind of transmission and sealing structure of steering drive axle, its sun gear shaft and universal shaft short fork are connected by inner and outer spline, improve the use condition of oil seal, the sealed movement form of oil seal and sun gear shaft changes from reciprocating pulling rotation into only rotation without pulling, improve the durability and service life of oil seal.But, the key connection between sun gear shaft and universal shaft short fork, due to space limit, only lubricating grease can be added in initial assembly, and subsequent maintenance cannot be carried out.Moreover, as oil temperature in planetary reduction mechanism increases, air pressure also increases, and oil leakage is more likely to occur at the sealing parts of each component. SUMMARY

[0008] Therefore, the present application aims to provide a wheel edge reducer to improve assembly accuracy and installation convenience.

[0009] To solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0010] A wheel edge reducer comprises a planetary gear reduction mechanism, which includes a sun gear shaft, a planet gear, a planet gear carrier and a ring gear. The planet gear carrier comprises an outer planet gear carrier and an inner planet gear carrier connected together, and the planet gear is rotatably installed between the outer planet gear carrier and the inner planet gear carrier. The wheel edge reducer further comprises an edge reduction box, wherein the planetary gear reduction mechanism is installed in the edge reduction box. The edge reduction box comprises an edge reduction box body, a first edge reduction box cover and a second edge reduction box cover. The first edge reduction box cover is fixedly connected with the edge reduction box body, and the second edge reduction box cover, the ring gear and the edge reduction box body are fixedly connected together. The outer planet gear carrier is provided with a shaft head, which is rotatably installed on the first edge reduction box cover through a first bearing and extends out of the first edge reduction box cover. The inner planet gear carrier is rotatably installed on the second edge reduction box cover through a second bearing. The sun gear shaft is rotatably installed on the outer planet gear carrier through a third bearing and rotatably installed on the inner planet gear carrier through a fourth bearing. One end of the sun gear shaft extends out of a mounting hole of the second edge reduction box cover.

[0011] The first oil seal is arranged between the shaft head and the first edge reduction box cover.

[0012] The sun gear shaft is axially fixed relative to the planet gear carrier, and a second oil seal is arranged between the second edge reduction box cover and the sun gear shaft.

[0013] The second edge reduction box cover is provided with an oil injection nozzle.

[0014] The edge reduction box body is provided with a vent plug.

[0015] The shaft head is fixedly connected with a hub connecting disc.

[0016] The beneficial effects of the present application are as follows:

[0017] The wheel side reducer disclosed by the present application is characterized in that the planetary gear reduction mechanism is installed in the side reduction box, the side reduction box comprises a side reduction box body, a first side reduction box cover and a second side reduction box cover, the first side reduction box cover is fixedly connected with the side reduction box body, the second side reduction box cover, the ring gear and the side reduction box body are fixedly connected together, when the drive axle or the steering drive axle is used, the side reduction box does not rotate relative to the half shaft shell, the ring gear is directly fixed in the side reduction box body and does not need to be connected with the knuckle shell through a threaded connecting piece, so the installation is convenient; the inner hole and the outer circle of the inner planetary carrier can be machined and clamped at one time and the fourth bearing and the second bearing are respectively installed, the inner hole and the outer circle of the outer planetary carrier can be machined and clamped at one time and the third bearing and the first bearing are respectively installed, the third bearing and the fourth bearing are used to support the sun gear shaft between the outer planetary carrier and the inner planetary carrier, the first bearing is used to support the outer planetary carrier on the first side reduction box cover, and the second bearing is used to support the inner planetary carrier on the second side reduction box cover, so the coaxiality of the sun gear shaft, the planetary carrier and the ring gear is easily ensured, and the assembly precision is improved.

[0018] In the present application, the outer planetary carrier is provided with a shaft head, the shaft head is rotatably installed on the first side reduction box cover through the first bearing and extends out of the first side reduction box cover, and the shaft head is fixedly connected with a hub connecting disc, so that different specifications of steel rings can be matched by replacing the hub connecting disc, and the adaptability of the drive axle is improved.

[0019] In the present application, when the steering drive axle is used, the sun gear shaft is slidably connected with one universal joint fork of the universal joint through a key, the sun gear shaft is axially fixed relative to the planetary carrier, a second oil seal is arranged between the second side reduction box cover and the sun gear shaft, the sealing movement form of the second oil seal and the sun gear shaft is changed from reciprocating pulling and rotating in the prior art to only rotating without pulling, the durability and service life of the oil seal are improved. At the same time, since the side reduction box structure is adopted, the internal space is increased, the second side reduction box cover is provided with an oil injection nozzle, the connecting piece between the side reduction box body and the knuckle shell is disassembled, the wheel side reducer is disassembled, and then the key connecting position between the universal joint fork and the sun gear shaft can be lubricated through the oil injection nozzle, so that the wheel side reducer can be maintained and repaired subsequently, and the maintainability is good.

[0020] In the present application, the side reduction box body does not rotate relative to the half shaft shell, so an air vent plug can be arranged on the top of the side reduction box body, when the oil temperature and the air pressure in the planetary reduction mechanism are increased, the air can be discharged upward through the air vent plug, the air pressure is reduced, the oil leakage and seepage problems of the side reduction box are solved, the pollution to the paddy field is avoided, and the conventional planetary reduction paddy field bridge is upgraded to a water and paddy dual-purpose bridge. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 This is a longitudinal sectional view of Embodiment 1 of the present invention, in which the wheel-side reducer is applied to a steering drive axle;

[0022] Figure 2 This is a longitudinal sectional view of Embodiment 2 of the present invention, in which the wheel-side reducer is applied to the drive axle;

[0023] In the picture:

[0024] 10. Hub connecting plate; 11A. Sun gear shaft; 11B. Sun gear shaft; 12A. Outer planetary gear carrier; 12B. Inner planetary gear carrier; 13. Ring gear; 14. First bearing; 15. Second bearing; 16. Third bearing; 17. Fourth bearing; 18. Planetary gears; 19. First oil seal; 20. Second oil seal; 21. Side reduction gearbox; 22. First side reduction gearbox cover; 23A. Second side reduction gearbox cover; 23B. Second side reduction gearbox cover; 24. Oil filler nozzle; 25. Breather plug; 26. Drain plug; 31. Steering knuckle housing; 32. Upper kingpin; 33. Lower kingpin; 41. First universal joint fork; 42. Second universal joint fork; 43. Cross shaft; 5A. Half shaft housing; 5B. Half shaft housing. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1

[0027] like Figure 1 As shown, a steering drive axle has a steering knuckle housing 31 rotatably mounted on a half-shaft housing 5A via an upper kingpin 32 and a lower kingpin 33.

[0028] The wheel-side reducer includes a planetary gear reduction mechanism, which comprises a sun gear shaft 11A, planetary gears 18, planetary gear carriers, and a ring gear 13. The planetary gear carrier includes an outer planetary gear carrier 12A and an inner planetary gear carrier 12B connected together. The planetary gears 18 are rotatably mounted between the outer planetary gear carrier 12A and the inner planetary gear carrier 12B. The planetary gear reduction mechanism has a large speed ratio, compact structure, and high transmission torque.

[0029] In the embodiment, the wheel-side reducer further comprises a side reduction box, the planetary gear reduction mechanism is installed in the side reduction box, the side reduction box comprises a side reduction box body 21, a first side reduction box cover 22 and a second side reduction box cover 23A, the side reduction box body 21 is fixedly connected with the knuckle shell 31, the first side reduction box cover 22 is fixedly connected with the side reduction box body 21, the second side reduction box cover 23A, the ring gear 13 and the side reduction box body 21 are fixedly connected together, the outer planetary carrier 12A is provided with a shaft head, the shaft head is rotatably installed on the first side reduction box cover 22 through a first bearing 14 and extends out of the first side reduction box cover 22. A first oil seal 19 is arranged between the shaft head and the first side reduction box cover 22. The inner planetary carrier 12B is rotatably installed on the second side reduction box cover 23A through a second bearing 15, the sun gear shaft 11A is rotatably installed on the outer planetary carrier 12A through a third bearing 16 and rotatably installed on the inner planetary carrier 12B through a fourth bearing 17, one end of the sun gear shaft 11A extends out of the mounting hole of the second side reduction box cover 23A and is drivingly connected with the universal joint. The bottom of the side reduction box body 21 is provided with a drain plug 26. The first bearing 14 is preferably a cylindrical roller bearing, and the second bearing 15, the third bearing 16 and the fourth bearing 17 are preferably ball bearings.

[0030] The above structure makes the side reduction box not rotate relative to the half shaft shell during operation, the ring gear 13 is directly fixed in the side reduction box body 21 and does not need to be connected with the knuckle shell 31 through a threaded connecting piece, so that the installation is convenient; the inner hole and the outer circle of the inner planetary carrier 12B can be machined once and the fourth bearing 17 and the second bearing 15 are installed respectively, the inner hole and the outer circle of the outer planetary carrier 12A can be machined once and the third bearing 16 and the first bearing 14 are installed respectively, the third bearing 16 and the fourth bearing 17 are used to support the sun gear shaft 11A between the outer planetary carrier 12A and the inner planetary carrier 12B, the first bearing 14 is used to support the outer planetary carrier 12A on the first side reduction box cover 22, and the second bearing 15 is used to support the inner planetary carrier 12B on the second side reduction box cover 23A, so that the coaxialities of the sun gear shaft 11A, the planetary carrier and the ring gear 13 are easily guaranteed, and the assembly precision is improved.

[0031] In the embodiment, the shaft head is fixedly connected with the hub connecting disc 10, by replacing the hub connecting disc 10, different specifications of the steel ring can be matched, and the adaptability of the drive axle is improved.

[0032] In this embodiment, the universal joint is a cross shaft type universal joint coupling, which comprises a first universal joint fork 41, a second universal joint fork 42 and a cross shaft 43, the first universal joint fork 41 is connected with the sun gear shaft 11A through key sliding connection, the sun gear shaft 11A is axially fixed relative to the planet carrier, and the second oil seal 20 is arranged between the second side reduction cover 23A and the sun gear shaft 11A. The second side reduction cover 23A is provided with an oil injection nozzle 24. The sealing movement form of the second oil seal 20 and the sun gear shaft 11A is changed from the reciprocating pulling rotation of the prior art to only rotation without pulling, which improves the durability and service life of the oil seal. At the same time, since the side reduction box structure is adopted, the internal space is increased, the oil injection nozzle 24 is conveniently arranged on the second side reduction cover 23A, the connecting piece of the side reduction box body 21 and the knuckle shell 31 is disassembled, the wheel side reducer is disassembled, and then the key connection between the first universal joint fork 41 and the sun gear shaft 11A can be lubricated through the oil injection nozzle 24, so that the wheel side reducer can be maintained and repaired subsequently, and the maintainability is good.

[0033] In this embodiment, the top of the side reduction box body 21 is provided with a vent plug 25. When the oil temperature in the planetary reduction mechanism rises and the air pressure rises, the vent plug 25 can be used to vent upward, thereby reducing the air pressure, solving the problem of oil leakage and seepage of the side reduction box, avoiding pollution to the paddy field, and upgrading the conventional planetary reduction dry field bridge to a water and dry dual-purpose bridge.

[0034] Embodiment 2

[0035] As shown in Figure 2 A drive axle, the wheel side reducer is installed in the half shaft shell 5B, and the wheel side reducer comprises a planetary gear reduction mechanism, the planetary gear reduction mechanism comprises a sun gear shaft 11B, a planet wheel 18, a planet carrier and a ring gear 13, the planet carrier comprises an outer planet carrier 12A and an inner planet carrier 12B connected together, and the planet wheel 18 is rotatably installed between the outer planet carrier 12A and the inner planet carrier 12B. The planetary gear reduction mechanism has large speed ratio, compact structure and large transmission torque.

[0036] In the embodiment, the wheel-side reducer further comprises a side reduction box, the planetary gear reduction mechanism is installed in the side reduction box, the side reduction box comprises a side reduction box body 21, a first side reduction box cover 22 and a second side reduction box cover 23B, the side reduction box body 21 is fixedly connected with the half shaft shell 5B, the first side reduction box cover 22 is fixedly connected with the side reduction box body 21, the second side reduction box cover 23B, the ring gear 13 and the side reduction box body 21 are fixedly connected together, the outer planetary carrier 12A is provided with a shaft head, the shaft head is rotatably installed on the first side reduction box cover 22 through a first bearing 14 and extends out of the first side reduction box cover 22. A first oil seal 19 is arranged between the shaft head and the first side reduction box cover 22. The inner planetary carrier 12B is rotatably installed on the second side reduction box cover 23B through a second bearing 15, the sun gear shaft 11B is rotatably installed on the outer planetary carrier 12A through a third bearing 16 and rotatably installed on the inner planetary carrier 12B through a fourth bearing 17, one end of the sun gear shaft 11B extends out of the mounting hole of the second side reduction box cover 23B. The bottom of the side reduction box body 21 is provided with a drain plug 26. The first bearing 14 is preferably a cylindrical roller bearing, and the second bearing 15, the third bearing 16 and the fourth bearing 17 are preferably ball bearings.

[0037] The above structure makes the side reduction box not rotate relative to the half shaft shell during operation, the ring gear 13 is directly fixed in the side reduction box body 21 and does not need to be connected with the half shaft shell 5B through a threaded connecting piece, so that the installation is convenient; the inner hole and the outer circle of the inner planetary carrier 12B can be machined at one time and the fourth bearing 17 and the second bearing 15 are installed respectively, the inner hole and the outer circle of the outer planetary carrier 12A can be machined at one time and the third bearing 16 and the first bearing 14 are installed respectively, the third bearing 16 and the fourth bearing 17 are used to support the sun gear shaft 11B between the outer planetary carrier 12A and the inner planetary carrier 12B, the first bearing 14 is used to support the outer planetary carrier 12A on the first side reduction box cover 22, and the second bearing 15 is used to support the inner planetary carrier 12B on the second side reduction box cover 23B, so that the coaxiality of the sun gear shaft 11B, the planetary carrier and the ring gear 13 is easily guaranteed, and the assembly precision is improved.

[0038] In the embodiment, the shaft head is fixedly connected with a hub connecting disc 10, different specifications of steel rings can be matched by replacing the hub connecting disc 10, and the adaptability of the drive axle is improved.

[0039] In the embodiment, the sun gear shaft 11B is axially fixed relative to the planetary carrier.

[0040] In the embodiment, the top of the side reduction box body 21 is provided with a vent plug 25. When the oil temperature in the planetary reduction mechanism rises and the air pressure rises, the air can be discharged upward through the vent plug 25, the air pressure is reduced, the oil leakage and seepage problem of the side reduction box is solved, the pollution to the paddy field is avoided, and the conventional planetary reduction dry field bridge is upgraded to a water and dry dual-purpose bridge.

[0041] The present application is not limited to the above-described embodiments, and all improvements made on the basis of the concept, principle, structure and method of the present application will fall within the scope of the present application.

Claims

1. A wheel-side reducer, comprising: A planetary gear reduction mechanism, comprising a sun gear shaft, planet gears, planet carriers, and a ring gear, wherein the planet carrier includes an outer planet carrier and an inner planet carrier connected together, and the planet gears are rotatably mounted between the outer planet carrier and the inner planet carrier; characterized in that... The wheel-side reducer also includes a side reducer housing, and the planetary gear reduction mechanism is installed inside the side reducer housing. The side reducer housing includes a side reducer housing body, a first side reducer housing cover, and a second side reducer housing cover. The side reducer housing body is fixedly connected to the steering knuckle housing, and the first side reducer housing cover is fixedly connected to the side reducer housing body. The second side reducer housing cover, the gear ring, and the side reducer housing body are fixedly connected together. The outer planetary gear carrier is provided with a shaft head, which is rotatably mounted on the first side reducer housing cover and extends out of the first side reducer housing cover via a first bearing. The inner planetary gear carrier... The wheel carrier is rotatably mounted on the second side reduction gearbox cover via a second bearing. The sun gear shaft is rotatably mounted on the outer planetary gear carrier via a third bearing and on the inner planetary gear carrier via a fourth bearing. One end of the sun gear shaft passes through the mounting hole of the second side reduction gearbox cover and is connected to a universal coupling. The universal coupling is a cross-shaft universal joint coupling, which includes a first universal joint fork, a second universal joint fork, and a cross shaft. The first universal joint fork is slidably connected to the sun gear shaft via a key. A first oil seal is provided between the shaft head and the first side reduction tank cover; The sun gear shaft is axially fixed relative to the planetary gear carrier, and a second oil seal is provided between the second side reducer cover and the sun gear shaft; The axle head is fixedly connected to a hub connecting disc.

2. The wheel-side reducer as described in claim 1, characterized in that, The second side reducer cover is provided with an oil nozzle that provides lubrication to the key connection between the sun gear shaft and the first universal joint fork.

3. The wheel-side reducer as described in claim 1, characterized in that, The side reduction box is equipped with a vent plug.

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