Differential transmission device, drive axle and vehicle

Abstract

The utility model relates to a differential transmission device, a drive axle and a vehicle, and the differential transmission device comprises a differential shell which can rotate around a differential axis under the action of driving torque; and at least two support bearings respectively coupled to the differential housing to provide support for the differential housing at different positions in the axial direction of the differential axis. The differential transmission device, the drive axle and the vehicle have the beneficial effects that the differential shell is supported through the two supporting bearings so as to improve the bearable rotating speed.

Description

Technical Field

[0001] The present application relates to the technical field of differentials, and in particular, to a differential transmission device, a drive axle, and a vehicle. Background Art

[0002] As an important component in an automobile, a differential is mainly used to meet the requirement that the rotational speeds of the two wheels on both sides are different when the automobile turns.

[0003] In the prior art, the housing of the differential is supported by a single bearing. However, due to the load requirements, the size of the single bearing is large, resulting in limited rotational speed that it can withstand and easy generation of noise. Summary of the Utility Model

[0004] An embodiment of the present application provides a differential transmission device, which improves the rotational speed that the differential transmission device can withstand and reduces noise to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of the present application, there is provided a differential transmission device, including:

[0006] A differential housing that can rotate about a differential axis under the action of a driving torque;

[0007] At least two support bearings, respectively coupled to the differential housing to provide support for the differential housing at different positions in the axial direction of the differential axis.

[0008] Optionally, the differential transmission device includes a planetary gear that can rotate relative to the differential housing about a planetary axis;

[0009] Wherein, in the axial direction of the differential axis, the planetary axis is located between the two support bearings.

[0010] Optionally, in the axial direction of the differential axis, the planetary gear is located between the two support bearings.

[0011] Optionally, the differential transmission device further includes:

[0012] An output gear that meshes with the planetary gear;

[0013] An output bearing sleeved on the output gear;

[0014] Wherein, in the axial direction of the differential axis, at least a part of the output bearing is disposed between the output gear and the differential housing.

[0015] Optionally, in the axial direction of the differential axis, the distance between at least a part of the support bearing and the planetary axis is greater than the distance between the output bearing and the planetary axis.

[0016] Optionally, at least a part of the support bearing and the output bearing are located at the same axial position in the axial direction of the differential axis.

[0017] Optionally, the differential housing further has:

[0018] A connection part for connecting to a driving device to receive the driving torque output by the driving device;

[0019] Wherein, at least a part of the support bearing is located between the connection part and the output bearing in the axial direction of the differential axis.

[0020] Optionally, the support bearing is sleeved on the differential housing, and the differential housing has a limiting boss, and in the axial direction of the differential axis, the limiting boss abuts against the support bearing.

[0021] Optionally, the differential housing has:

[0022] An inner housing space, in which both the planetary gear and the output gear are located;

[0023] An oil inlet, which penetrates through the differential housing to connect the inner housing space with the outside.

[0024] Optionally, the differential housing includes a first housing and a second housing, and the first housing and the second housing enclose the inner housing space, and both the first housing and the second housing are provided with the oil inlet.

[0025] Optionally, the differential transmission device further includes:

[0026] A holding member having a plurality of planetary shaft portions;

[0027] Wherein, the planetary shaft portions are fixedly connected to the differential housing, and the planetary gears are rotatably connected to the planetary shaft portions; in the circumferential direction of the differential axis, the planetary shaft portions are arranged at different positions.

[0028] According to a second aspect of the present application, there is provided a drive axle, including:

[0029] The differential transmission device as described above;

[0030] A driving device for outputting a driving torque;

[0031] A bridge housing having an installation space;

[0032] Wherein, the differential transmission device is arranged in the installation space.

[0033] Optionally, the bridge housing has or is non-rotatably connected with:

[0034] An installation body for fixing the support bearing;

[0035] Wherein, in the radial direction of the differential axis, the support bearing is located between the installation body and the differential housing;

[0036] The installation body has a limiting flange, and in the axial direction of the differential axis, the limiting flange abuts against the support bearing.

[0037] Optionally, the axle housing is formed with a clamping groove surrounding the differential axis; the drive axle includes:

[0038] A snap ring, at least partially embedded in the clamping groove;

[0039] Wherein, in the axial direction of the differential axis, the snap ring abuts against the installation body.

[0040] According to the third aspect of the present application, there is also provided a vehicle including the drive axle as described above.

[0041] The beneficial effects of the present application are as follows: A differential transmission device, a drive axle and a vehicle are provided, which provide support for the differential housing through two support bearings to improve the speed that can be tolerated.

[0042] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0043] By providing two support bearings to provide support for the differential housing at different positions in the axial direction of the differential axis, in this way, the size of a single support bearing can be reduced, thereby increasing the speed that the support bearing can tolerate and reducing the noise of the support bearing.

[0044] At the same time, by providing support for the differential housing through two support bearings, the stability of the differential housing can be improved, thereby improving the running smoothness of the differential transmission device.

[0045] Other features and advantages of the present application will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0047] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals in the following description represent the same parts.

[0048] Figure 1 It is a schematic diagram of the overall structure of the differential transmission device provided in the exemplary embodiment of the present application;

[0049] Figure 2 It is an internal sectional view of the differential transmission device provided in the exemplary embodiment of the present application;

[0050] Figure 3 It is a schematic diagram of the overall structure of the drive axle provided in the exemplary embodiment of the present application;

[0051] Figure 4 It is an internal sectional view of the drive axle provided in the exemplary embodiment of the present application;

[0052] Figure 5 It is an internal sectional view of a part of the drive axle provided in the exemplary embodiment of the present application;

[0053] Figure 6 It is Figure 5 an enlarged schematic diagram of part A in;

[0054] Figure 7 It is Figure 5 an enlarged schematic diagram of part B in;

[0055] Figure 8 It is Figure 5 an enlarged schematic diagram of part C in.

[0056] Explanation of reference numerals:

[0057] 100, differential transmission device;

[0058] 110, differential housing; 110a, connecting part; 110b, limiting boss; 110c, inner space of the housing; 110d, oil inlet;

[0059] 111, first housing; 112, second housing;

[0060] 121, planetary gear; 122, output gear; 123, support bearing;

[0061] 124, output bearing;

[0062] 130, retaining member; 131, planetary shaft part;

[0063] C1, differential axis; C2, planetary axis;

[0064] 10, drive axle;

[0065] 210, driving device; 211, output shaft;

[0066] 220, axle housing; 220a, installation space; 220b, clamping groove;

[0067] 230. Mounting body; 231. Limiting flange; 232. End face; 230a. Limiting groove;

[0068] 240. Retaining ring;

[0069] 251. First differential half shaft; 252. Second differential half shaft; 260. Reduction mechanism. Detailed implementation manner

[0070] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0071] According to the first aspect of the present application, with reference to Figure 1 and Figure 2 , the present application provides a differential transmission device 100, including: a differential housing 110 and a support bearing 123.

[0072] The differential housing 110 can rotate around a differential axis C1 under the action of a driving torque; the driving torque can be provided by a driving motor or an engine.

[0073] There are two support bearings 123, and the two support bearings 123 are respectively coupled to the differential housing 110 to provide support for the differential housing 110 at different positions in the axial direction of the differential axis C1.

[0074] The "coupling" in the present application can be understood as a fixing method achieved by welding, detachable connection, interference fit, etc.

[0075] Of course, the number of support bearings 123 can also be greater than two. Exemplarily, there are two groups of support bearings 123, and the two groups of support bearings 123 are respectively coupled to the differential housing 110 to provide support for the differential housing 110 at different positions in the axial direction of the differential axis C1, wherein each group includes at least two support bearings.

[0076] Through the above technical solution, by providing two support bearings 123 to support the differential housing 110 at different positions in the axial direction of the differential axis C1, in this way, the size of a single support bearing 123 can be reduced, thereby increasing the rotational speed that the support bearing 123 can withstand and reducing the noise of the support bearing 123.

[0077] At the same time, by providing support for the differential housing 110 through two support bearings 123, the stability of the differential housing 110 can be improved, thereby improving the running smoothness of the differential transmission device 100.

[0078] In some embodiments, with reference to Figure 1 and Figure 2 , the differential transmission device includes a planetary gear 121 that can rotate relative to the differential housing 110 about a planetary axis C2. Among them, in the axial direction of the differential axis C1, the planetary axis C2 is located between the two support bearings 123.

[0079] Specifically, the planetary gear 121 is rotatably connected to the differential housing 110, and the planetary axis C2 is perpendicular to the differential axis C1.

[0080] Adopting such a solution, by defining the positions of the two support bearings 123 relative to the planetary axis C2, the two support bearings 123 can stably support the differential housing 110.

[0081] In some embodiments, with reference to Figure 1 and Figure 2 , in the axial direction of the differential axis C1, the planetary gear 121 is located between the two support bearings 123. It can be understood that the distance between the two support bearings 123 in the axial direction of the differential axis C1 is greater than the diameter of the planetary gear 121.

[0082] Adopting such a solution, by defining the positional relationship between the two support bearings 123, the differential housing 110 can be supported more stably.

[0083] In some embodiments, with reference to Figure 1 and Figure 2 , the differential transmission device 100 further includes: an output gear 122 and an output bearing 124.

[0084] The output gear 122 is rotatably connected to the differential housing 110, and the output gear 122 meshes with the planetary gear 121. There are two output gears 122, and the two output gears 122 are used to connect a differential half shaft respectively.

[0085] The differential housing 110 drives the planetary gear 121 to revolve around the differential axis C1, and then drives the output gear 122 to revolve around the differential axis C1 through the meshing of the output gear 122 and the planetary gear 121. At the same time, since the planetary gear 121 can rotate relative to the differential housing 110, a speed difference can be formed between the two output gears 122.

[0086] The output bearing 124 is sleeved on the output gear 122. In the axial direction of the differential axis C1, at least part of the output bearing 124 is arranged between the output gear 122 and the differential housing 110, and the output bearing 124 is used to reduce the friction and wear between the output gear 122 and the differential housing 110.

[0087] As an alternative, the output bearing 124 is a sliding bearing made of wear-resistant material. The sliding bearing can disperse the load and provide a larger contact area, thereby withstanding a higher load. Specifically, the sliding bearing is a brass bearing.

[0088] In some embodiments, referring to Figure 1 and Figure 2 , in the axial direction of the differential axis C1, the distance D1 between at least part of the support bearing 123 and the planetary axis C2 is greater than the distance D2 between the output bearing 124 and the planetary axis C2.

[0089] It can be understood that the distance between the two support bearings 123 is greater than the distance between the two output bearings 124, that is, the load-bearing position of the output bearing 124 is located between the two support bearings 123.

[0090] Adopting such a solution, by defining the positional relationship between the support bearing 123 and the output bearing 124, the load-bearing capacity of the support bearing 123 is improved, the stability of the differential housing 110 is improved, and deformation and vibration are reduced.

[0091] In some embodiments, referring to Figure 1 and Figure 2 , in the axial direction of the differential axis C1, at least part of the support bearing 123 and the output bearing 124 are located at the same axial position. It can be understood that in the radial direction of the differential axis C1, part of the support bearing 123, the differential housing 110, the output bearing 124, and the output gear 122 are stacked.

[0092] Adopting such a solution, when the output gear 122 rotates relative to the differential gear, a large stress is borne at the output bearing 124. At the same time, a large stress is also borne by a part of the differential housing 110 that cooperates with the output bearing 124. By defining the position of the support bearing 123 and the output bearing 124 in this application, the support bearing 123 can constrain the part with large stress, reduce deformation and vibration, and has a compact structure, reducing the axial installation space 220a.

[0093] In some embodiments, referring to Figure 1 and Figure 2 , the differential housing 110 further has: a connection portion 110a.

[0094] The connection portion 110a is used to connect to the driving device 210 to receive the driving torque output by the driving device 210. In the axial direction of the differential axis C1, at least part of the support bearing 123 is located between the connection portion 110a and the output bearing 124.

[0095] Exemplarily, the connection part 110a is connected to the driving device 210. A part of the support bearing 123 is located between the connection part 110a and the output bearing 124, and another part of the support bearing 123 is located at the same axial position as the connection part 110a.

[0096] With such a solution, since the connection part 110a bears the rotational force and there is a distribution of shear stress, by defining that at least part of the support bearing 123 is located between the connection part 110a and the output bearing 124, the constraint on the connection part 110a can be increased, deformation and vibration can be reduced, and at the same time, the stress distribution on the differential housing 110 can be balanced.

[0097] Optionally, the connection part 110a is provided with structures such as splines, keyways or couplings that can achieve power transmission.

[0098] In some embodiments, referring to Figure 1 and Figure 2 , the support bearing 123 is sleeved on the differential housing 110. The differential housing 110 has a limit boss 110b. In the axial direction of the differential axis C1, the limit boss 110b abuts against the support bearing 123.

[0099] With such a solution, through the setting of the limit boss 110b, the support bearing 123 is limited in the axial direction of the differential axis C1, which is convenient for the assembly of the support bearing 123.

[0100] As an alternative solution, the support bearing 123 adopts a sliding bearing. The support bearing 123 includes an inner ring, an outer ring and rolling elements. The rolling elements transmit the load between the inner ring and the outer ring through rolling motion and reduce sliding friction. The inner ring is non-rotatably connected to the differential housing 110. For example, the inner ring is key-connected or interference-fitted with the differential housing 110, so that the inner ring rotates synchronously with the differential housing 110. At the same time, the inner ring of the support bearing 123 abuts against the limit boss 110b.

[0101] In some embodiments, referring to Figure 1 and Figure 2 , the differential housing 110 has: an inner housing space 110c and an oil inlet 110d.

[0102] The planetary gear 121 and the output gear 122 are both located in the inner housing space 110c, and the differential housing 110 protects the planetary gear 121 and the output gear 122. The oil inlet 110d penetrates through the differential housing 110 to connect the inner housing space 110c with the outside, which is beneficial to the lubricating oil to enter and exit the inner housing space 110c, and improves the heat dissipation effect and lubrication effect of the differential transmission device 100.

[0103] As an alternative, a plurality of oil inlets 110d are provided, and the plurality of oil inlets 110d are arranged at intervals in the circumferential direction of the differential axis C1, so that the lubricating oil uniformly enters and exits the inner space 110c of the housing in the circumferential direction, further improving the heat dissipation effect and the lubrication effect.

[0104] In some embodiments, referring to Figure 1 , the differential housing 110 includes a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 enclose an inner space 110c of the housing, and oil inlets 110d are provided on both the first housing 111 and the second housing 112. By providing the first housing 111 and the second housing 112, it is convenient for the installation and maintenance of the planetary gear 121 and the output gear 122 inside the differential housing 110, and compared with manufacturing an integral housing, the processing difficulty and cost are reduced.

[0105] Exemplarily, the first housing 111 and the second housing 112 are fixed by a plurality of fasteners (such as bolts).

[0106] In some embodiments, referring to Figure 1 and Figure 2 , the differential transmission device 100 further includes: a retaining member 130.

[0107] The retaining member 130 has a plurality of planetary shaft portions 131. The plurality of planetary shaft portions 131 are respectively fixedly connected to the differential housing 110, and the planetary gear 121 is rotatably connected to the planetary shaft portions 131, and the planetary gear 121 is supported by the planetary shaft portions 131. In the circumferential direction of the differential axis C1, the planetary shaft portions 131 are arranged at different positions.

[0108] As an alternative, the retaining member 130 adopts a cross shaft, that is, it has four planetary shaft portions 131. Correspondingly, four planetary gears 121 are provided. By adopting the cross shaft arrangement of the retaining member 130, that is, four planetary gears 121 rotate around the retaining member 130, the differential transmission device 100 has better stability and lower noise at high speeds.

[0109] According to the second aspect of the present application, referring to Figure 3 and Figure 4 , a drive axle 10 is provided, and the drive axle 10 includes the above-mentioned differential transmission device 100.

[0110] The drive axle 10 further includes: a drive device 210 and a axle housing 220. The drive device 210 is used to output a driving torque; the axle housing 220 has an installation space 220a; wherein, the differential transmission device 100 is arranged in the installation space 220a.

[0111] Optionally, the driving device 210 employs a motor, and the output shaft 211 of the driving device 210 is non-rotatably connected to the connecting portion 110a of the differential housing 110.

[0112] The differential of the present application is supported by two support bearings 123. Through experimental verification, the limiting speed of the support bearings 123 can reach 8500 rpm, and they have better performance in terms of noise and anti-fatigue properties. During the current on-vehicle test, when the motor runs at 5300 rpm, the differential transmission device 100 has no noise and runs smoothly. After continuous testing for 1 hour, there is no abnormal noise in the support bearings 123.

[0113] In some embodiments, referring to Figures 4 to 6 , the axle housing 220 has or is non-rotatably connected to: a mounting body 230.

[0114] The mounting body 230 is used to fixedly support the support bearings 123; in the radial direction of the differential axis C1, the support bearings 123 are located between the mounting body 230 and the differential housing 110. The mounting body 230 has a limiting flange 231, and in the axial direction of the differential axis C1, the limiting flange 231 abuts against the support bearings 123.

[0115] Exemplarily, the outer ring of the support bearing 123 is non-rotatably connected to the mounting body 230. For example, the outer ring is key-connected or interference-fitted with the mounting body 230, so that the outer ring is fixed to the mounting body 230 and thus fixed to the axle housing 220. At the same time, the outer ring of the support bearing 123 abuts against the limiting flange 231.

[0116] Adopting such a scheme, through the setting of the limiting flange 231, the support bearings 123 are limited in the axial direction of the differential axis C1, which is convenient for the assembly of the support bearings 123.

[0117] In some embodiments, referring to Figure 5 , Figure 7 and Figure 8 , the axle housing 220 is formed with a clamping groove 220b surrounding the differential axis C1. Specifically, the clamping groove 220b is formed on the side wall of the installation space 220a.

[0118] The drive axle 10 further includes: a retaining ring 240. The retaining ring 240 is at least partially embedded in the clamping groove 220b. In the axial direction of the differential axis C1, the retaining ring 240 abuts against the mounting body 230. In this way, the mounting body 230 is limited in the axial direction of the differential axis C1, preventing the mounting body 230 from moving relative to the axle housing 220.

[0119] As an example, referring to Figure 7 , the retaining ring 240 can abut against the end face 232 of the mounting body 230, thereby realizing the limitation of the mounting body 230.

[0120] As another example, referring toFigure 4 and Figure 5 The mounting body 230 forms a limiting groove 230a, and another part of the retaining ring 240 is embedded in the limiting groove 230a, thereby realizing the limitation of the mounting body 230.

[0121] In some embodiments, referring to Figure 5 、 Figure 7 and Figure 8 the axle housing 220 is fixedly connected to the driving device 210. The drive axle 10 further includes a first differential half shaft 251, a second differential half shaft 252 and two reduction mechanisms 260. One end of the first differential half shaft 251 is non-rotatably connected to one of the output gears 122, and the other end is connected to a reduction mechanism 260; one end of the second differential half shaft 252 is non-rotatably connected to the other output gear 122, and the other end is disposed through the output shaft 211 of the drive motor and connected to the other reduction mechanism 260.

[0122] The working process of the drive axle 10 of the present application is exemplarily described as follows: First, the driving torque is output from the output shaft 211 of the driving device 210 to the differential housing, and the power passes through the differential housing, the retaining member 130, the planetary gear 121 to reach the differential gear. Finally, the power is respectively output from the first differential half shaft 251 and the second differential half shaft 252 to the corresponding reduction mechanisms 260.

[0123] According to the third aspect of the present application, a vehicle is provided. The vehicle includes the above-mentioned drive axle 10, and the vehicle has all the beneficial effects of the above-mentioned drive axle 10, which will not be elaborated herein.

[0124] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0125] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0126] The embodiments, implementation manners and related technical features of the present application can be combined and replaced with each other without conflict.

[0127] The above are only the preferred embodiments of the present application, and do not impose any form of limitation on the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A differential transmission device, characterized in that: include: A differential housing capable of rotating about a differential axis under the action of a driving torque; At least two support bearings are respectively coupled to the differential case to provide support for the differential case at different positions in the axial direction of the differential axis.

2. The differential transmission device according to claim 1, characterized in that: The differential transmission device includes a planetary gear, and the planetary gear can rotate around a planetary axis relative to the differential housing; Wherein, in the axial direction of the differential axis, the planetary axis is located between the two support bearings.

3. The differential transmission device according to claim 2, characterized in that: In the axial direction of the differential axis, the planetary gear is located between the two support bearings.

4. The differential transmission device according to claim 2, characterized in that: The differential transmission device further comprises: an output gear meshing with the planetary gear; An output bearing, sleeved on the output gear; Wherein, in the axial direction of the differential axis, at least part of the output bearing is arranged between the output gear and the differential housing.

5. The differential transmission device according to claim 4, characterized in that: In the axial direction of the differential axis, a distance between at least part of the support bearings and the planetary axis is greater than a distance between the output bearing and the planetary axis.

6. The differential transmission device according to claim 5, characterized in that: In the axial direction of the differential axis, at least part of the support bearings and the output bearing are located at the same axial position.

7. The differential transmission device according to claim 5, characterized in that: The differential housing also has: A connecting portion, used to connect to the driving device to receive the driving torque output by the driving device; Wherein, in the axial direction of the differential axis, at least part of the support bearing is located between the connecting portion and the output bearing.

8. The differential transmission device according to any one of claims 1 to 7, characterized in that: The support bearing is sleeved on the differential housing, and the differential housing has a limiting boss. In the axial direction of the differential axis, the limiting boss abuts against the support bearing.

9. The differential transmission device according to any one of claims 4 to 7, characterized in that: The differential housing has: An inner shell space, wherein the planetary gear and the output gear are both located in the inner shell space; The oil inlet penetrates the differential housing to connect the space inside the housing with the outside.

10. The differential transmission device according to claim 9, characterized in that: The differential housing comprises a first housing and a second housing, wherein the first housing and the second housing together enclose the inner housing space, and the first housing and the second housing are both provided with the oil inlet.

11. The differential transmission device according to any one of claims 2 to 7, characterized in that: The differential transmission device further comprises: A retaining member having a plurality of planetary shaft portions; The planetary shaft is fixedly connected to the differential housing, and the planetary gear is rotationally connected to the planetary shaft; the planetary shaft is arranged at different positions in the circumferential direction of the differential axis.

12. A drive axle, characterized in that: include: The differential transmission device according to any one of claims 1 to 11; A driving device, for outputting a driving torque; A bridge housing having a mounting space; Wherein, the differential transmission device is arranged in the installation space.

13. The drive axle according to claim 12, characterized in that: The axle housing has or is connected to a non-rotating connection: A mounting body, used for fixing the support bearing; Wherein, in the radial direction of the differential axis, the support bearing is located between the mounting body and the differential housing; The mounting body has a limiting flange, and in the axial direction of the differential axis, the limiting flange abuts against the support bearing.

14. The drive axle according to claim 13, characterized in that: The axle housing is formed with a slot surrounding the differential axis; the drive axle comprises: A retaining ring, at least partially embedded in the slot; Wherein, in the axial direction of the differential axis, the retaining ring abuts against the mounting body.

15. A vehicle, characterized in that: A drive axle comprising any one of claims 12 to 14.

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