Bevel gear edge speed reduction transmission structure

Abstract

The invention relates to the technical field of heavy truck drive axle hub reduction gears, and discloses a bevel gear edge reduction transmission structure, a planet carrier assembly is arranged at a flange part of a hub reduction gear shell and is connected with a flange part of a hub through a bolt, and a pin shaft connecting part is further arranged in the planet carrier assembly. According to the structure, a sun gear, a planet gear and a gear ring which form the planetary reducer are driven by bevel gears; the thrust bearings are additionally arranged at the two ends of the sun gear to offset axial force brought by helical gear transmission, the high-strength positioning steel sleeves are additionally arranged on the hub reduction gear shell and the inner side planet carrier to prevent dislocation of the hub reduction gear shell and the inner side planet carrier during large torque, the helical gear reduction transmission reduces noise of an electric drive axle, the transmission stability of the hub planetary reduction gear is improved, and the service life of the hub reduction gear is prolonged. Compared with a straight gear edge planetary reducer, the torque transmission capacity is improved, and abnormal transmission or failure of the hub reduction gear caused by dislocation of the hub reduction gear shell and the inner side planet carrier under the action of large torque is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heavy truck drive axle wheel side reducer, in particular to a helical gear side reduction transmission structure. BACKGROUND

[0002] The heavy truck drive axle usually adopts a wheel side reducer as the last stage of the vehicle transmission system to reduce the load and size of the main reducer and other components, thereby obtaining a larger ground clearance and other advantages.

[0003] The heavy truck electric drive axle often needs a larger transmission ratio than the traditional drive axle to meet the power performance of commercial vehicles, and the wheel side reducer is a good solution, but the torque capacity, noise problem and transmission stability of the wheel side reducer become more prominent problems.

[0004] The existing heavy truck drive axle wheel side reducer adopts a sun gear connected with the half shaft, a planetary reducer composed of the sun gear, five planetary gears and a ring gear, and a wheel bolt connection between the wheel side reducer shell and the inner side carrier assembly and the wheel hub to transmit torque to the wheel output. The planetary reducer adopts straight gear transmission, and the wheel side reducer shell and the inner side carrier are connected by bolts without positioning pins.

[0005] The following disadvantages of the prior art:

[0006] 1. The existing heavy truck drive axle wheel side reducer adopts straight gear transmission, which has the disadvantages of unstable transmission, high noise and limited torque transmission.

[0007] 2. The wheel side reducer shell and the inner side carrier of the existing heavy truck drive axle wheel side reducer are connected by bolts without positioning pins, which can easily cause torsional misalignment of the wheel side reducer shell and the inner side carrier when the heavy truck electric drive axle outputs large torque. This misalignment is transmitted to the planetary gear pin shaft, which can cause uneven meshing of the planetary gear and the sun gear, aggravate the problems of unstable transmission and noise, and even cause gear jamming and early damage to the gear tooth surface in extreme cases.

[0008] 3. The wheel side reducer shell and the inner side carrier of the existing heavy truck drive axle wheel side reducer are machined in pairs, but they need to be separated during assembly, and cannot be assembled in the original paired position after separation, which increases the concentricity deviation of the planetary gear pin shaft. SUMMARY

[0009] (I) Technical problems solved

[0010] In view of the shortcomings of the prior art, the present application provides a helical gear side reduction transmission structure, which has the advantages of reducing the noise of the electric drive axle and solving the above technical problems.

[0011] (II) Technical solutions

[0012] In order to achieve the above object, the application provides the following technical scheme: a bevel gear wheel edge reduction transmission structure, comprising a half shaft, an axle housing and a wheel hub, further comprising a planetary carrier assembly, the planetary carrier assembly is arranged at a flange part of a wheel edge reduction gear housing and is connected with the flange part of the wheel hub through bolts, a pin shaft connecting part is further arranged in the planetary carrier assembly, the half shaft is connected with a sun gear through a snap spring and is connected with the pin shaft connecting part at a large circular hole of the wheel edge reduction gear housing, an outer thrust bearing is connected in the wheel edge reduction gear housing, and a pressure cover is connected with the wheel edge reduction gear housing through a pressure cover connecting bolt at the large circular hole side of the wheel edge reduction gear housing.

[0013] As a preferred technical scheme of the application, the planetary carrier assembly comprises a gear ring support, a gear ring, a gear ring snap spring, a shaft nut, an inner planetary carrier, a positioning steel sleeve and a wheel edge reduction gear housing connecting bolt.

[0014] After the gear ring is connected with the gear ring support through the gear ring snap spring, the gear ring is installed on the axle housing through the shaft nut.

[0015] After the wheel edge reduction gear housing is positioned and connected with the inner planetary carrier through the positioning steel sleeve, the wheel edge reduction gear housing connecting bolt is used to form the planetary carrier assembly.

[0016] As a preferred technical scheme of the application, the pin shaft connecting part specifically comprises an inner thrust bearing, an anti-friction gasket, a planetary gear, a needle bearing and a planetary gear pin shaft.

[0017] The inner thrust bearing is installed inside a large circular hole of the inner planetary carrier, the anti-friction gasket, the planetary gear and the needle bearing are concentrically stacked in sequence and are put into the planetary carrier assembly along the direction of the large circular hole of the inner planetary carrier and are coaxially aligned with a planetary gear pin shaft hole.

[0018] As a preferred technical scheme of the application, the half shaft is connected with the sun gear through the snap spring, the sun gear is engaged with the planetary gear, and the planetary gear is engaged with the gear ring.

[0019] Compared with the prior art, the application provides a bevel gear wheel edge reduction transmission structure, which has the following advantages

[0020] Beneficial effects:

[0021] This invention utilizes helical gear transmission in the sun gear, planet gears, and ring gear that make up the planetary reducer. Thrust bearings are added to both ends of the sun gear to counteract the axial force caused by the helical gear transmission. High-strength positioning steel sleeves are added to the wheel-side reducer housing and the inner planetary carrier to prevent misalignment of the wheel-side reducer housing and the inner planetary carrier under high torque. The helical gear side reduction transmission reduces the noise of the electric drive bridge and improves the transmission smoothness of the wheel-side planetary reducer. Compared with the spur gear side planetary reducer, it improves the torque transmission capacity and avoids abnormal transmission or failure of the wheel-side reducer caused by misalignment of the wheel-side reducer housing and the inner planetary carrier under high torque. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention.

[0023] The components are as follows: 1. Half shaft; 2. Gear ring support; 3. Gear ring; 4. Inner planetary carrier; 5. Positioning steel sleeve; 6. Wheel-side reducer housing; 7. Wheel-side reducer housing connecting bolts; 8. Outer thrust bearing; 9. Pressure cap connecting bolts; 10. Pressure cap; 11. Snap ring; 12. Sun gear; 13. Planetary gears; 14. Planetary gear pins; 15. Needle roller bearing; 16. Anti-friction shim; 17. Inner thrust bearing; 18. Gear ring snap ring; 19. Shaft nut. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1 A helical gear side reduction transmission structure includes a half shaft 1 and a bridge housing, and also includes a planetary carrier assembly. The planetary carrier assembly is disposed at the flange part of the wheel-side reducer housing 6 and is connected to the flange part of the wheel hub by bolts. The planetary carrier assembly is also provided with a pin shaft connection component to maintain internal stability. The half shaft 1 is connected to the sun gear 12 through a snap ring 11 and enters the large round hole of the wheel-side reducer housing 6 to connect with the pin shaft connection component. An outer thrust bearing 8 is connected inside the wheel-side reducer housing 6. The pressure cap 10 is connected to the wheel-side reducer housing 6 through a pressure cap connection bolt 9.

[0026] The planetary carrier assembly includes a gear ring bracket 2, a gear ring 3, a gear ring retaining ring 18, a shaft nut 19, an inner planetary carrier 4, a positioning steel sleeve 5, and a wheel-side reducer housing connecting bolt 7.

[0027] After the gear ring 3 and gear ring bracket 2 are connected by gear ring snap ring 18, they are installed on the axle housing by shaft nut 19;

[0028] After the wheel-side reducer housing 6 and the inner planetary carrier 4 are positioned and connected by the positioning steel sleeve 5, the planetary carrier assembly is formed by the wheel-side reducer housing connecting bolt 7.

[0029] The pin connection components specifically include an inner thrust bearing 17, a wear-reducing washer 16, a planetary gear 13, a needle roller bearing 15, and a planetary gear pin 14;

[0030] The inner thrust bearing 17 is installed inside the four large round holes of the inner planetary carrier. The anti-friction shim 16, planetary gear 13 and needle roller bearing 15 are stacked concentrically in sequence and placed into the planetary carrier assembly along the direction of the four large round holes of the inner planetary carrier, and are aligned with the coaxial center of the planetary gear pin 14 hole.

[0031] The half-shaft 1 is connected to the sun gear 12 via the snap ring 11, and the sun gear 12 meshes with the planet gear 13. The planet gear 13 meshes with the gear ring 3. The sun gear 12, the planet gear 13 and the gear ring 3 form a planetary transmission mechanism.

[0032] This invention comprises a gear ring 3 and a gear ring bracket 2 connected by a gear ring retainer 18, and then mounted on the axle housing by a shaft nut 19; a wheel-side reduction housing 6 and an inner planetary carrier 4 are positioned and connected by a positioning steel sleeve 5 and then fastened with wheel-side reduction housing connecting bolts 7 to form a planetary reduction transmission planetary carrier assembly; an inner thrust bearing 17 is installed inside the large circular hole of the inner planetary carrier 4; a friction-reducing pad 16, planetary gears 13, and needle roller bearings 15 are concentrically stacked in sequence and placed into the planetary carrier assembly along the direction of the large circular hole of the inner planetary carrier 4, with the concentric shaft holes aligned with the planetary gear pin shafts 14 holes of the planetary carrier assembly, and the planetary gear pin shafts 14 are moved from the wheel side... The planetary gear pin 14 is inserted into the outer part of the reducer housing 6; the planetary carrier assembly, into which the planetary gears and pins are installed, is fastened to the flange of the wheel reducer housing 6 and the flange of the wheel hub 20 with bolts to ensure that the planetary gear 13 and the gear ring 3 are correctly meshed; the sun gear 12 and the half shaft 1 are connected by the snap ring 11 and then inserted from the large round hole on the outer part of the wheel reducer housing 6 to maintain the correct meshing of the sun gear 12 and the planetary gear 13; the outer thrust bearing 8 is inserted into the large round hole of the wheel reducer housing 6, and the cover 10 is fitted with the large round hole of the wheel reducer housing 6 with the cover connecting bolt 9, and the cover 10 is fastened to the wheel reducer housing 6;

[0033] When the electric drive axle is working, the motor torque is reduced and increased by the main reducer and then output to half shaft 1. Half shaft 1 transmits the torque to the wheel-side planetary reducer for further reduction and torque increase before outputting to the wheel assembly.

[0034] The sun gear 12, planet gears 13, and ring gear 3 that make up the planetary reducer adopt helical gear transmission. Thrust bearings (outer thrust bearing 8 and inner thrust bearing 17) are added to both ends of the sun gear 12 to counteract the axial force caused by the helical gear transmission. High-strength positioning steel sleeves 5 are added to the wheel-side reducer housing 6 and the inner planetary carrier 4 to prevent misalignment of the wheel-side reducer housing 6 and the inner planetary carrier 4 under high torque. The positioning steel sleeve 5 is coaxially connected to the bolt 7 of the bolt wheel-side reducer housing. The bolt passes through the inner hole of the positioning steel sleeve 5. The wheel-side reducer housing 6 and the inner planetary carrier 4 are machined in pairs. After pressing in the positioning steel sleeve 5, the wheel-side reducer housing 6 and the inner planetary carrier 4 are paired and fixed together. The mounting holes of the planetary gear pins 14 are precision bored in one go to ensure concentricity. The planetary reducer gears sun gear 12, planet gears 13, and ring gear 3 are not disassembled when installing the planetary reducer gears.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A helical gear reduction transmission structure, comprising a half-shaft (1), a bridge housing, and a hub, characterized in that: It also includes a planetary carrier assembly, which is located on the flange of the wheel-side reducer housing (6) and connected to the flange of the wheel hub by bolts. The planetary carrier assembly is also provided with a pin connection component. The half shaft (1) is connected to the sun gear (12) by a snap ring (11) and enters the pin connection component at the large round hole of the wheel-side reducer housing (6). An outer thrust bearing (8) is connected inside the wheel-side reducer housing (6). The pressure cap (10) is connected to the wheel-side reducer housing (6) by a pressure cap connection bolt (9).

2. The helical gear side reduction transmission structure according to claim 1, characterized in that: The planetary carrier assembly includes a gear ring bracket (2), a gear ring (3), a gear ring retaining ring (18), a shaft nut (19), an inner planetary carrier (4), a positioning steel sleeve (5), and a wheel-side reducer housing connecting bolt (7). The gear ring (3) and gear ring bracket (2) are connected by gear ring snap ring (18) and then installed on the axle housing by shaft nut (19); After the wheel-side reducer housing (6) and the inner planetary carrier (4) are positioned and connected by the positioning steel sleeve (5), the planetary carrier assembly is formed by the wheel-side reducer housing connecting bolts (7).

3. The helical gear side reduction transmission structure according to claim 2, characterized in that: The pin connection components specifically include an inner thrust bearing (17), a wear-reducing washer (16), a planetary gear (13), a needle roller bearing (15), and a planetary gear pin (14); The inner thrust bearing (17) is installed inside the large round hole of the inner planetary carrier (4). The anti-friction pad (16), planetary gear (13) and needle roller bearing (15) are stacked concentrically in sequence and placed into the planetary carrier assembly along the direction of the large round hole of the inner planetary carrier (4), and are aligned with the coaxiality of the planetary gear pin (14) hole.

4. The helical gear side reduction transmission structure according to claim 3, characterized in that: The half shaft (1) is connected to the sun gear (12) via a snap ring (11), and the sun gear (12) meshes with the planet gear (13), while the planet gear (13) meshes with the gear ring (3).

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