Differential mechanism and vehicle differential transmission system comprising same

Abstract

The utility model provides a differential mechanism and a vehicle differential transmission system comprising the same. The differential mechanism comprises a shell, a first gear set and a second gear set. Wherein the first gear set and the second gear set are arranged in a cavity of the shell, and the first gear set is meshed with the second gear set; shaft holes are formed in the two opposite sides of the shell and communicate with the cavity, and the transmission shaft extends into the cavity through the shaft holes. The inner wall of the shell comprises installation faces corresponding to the first gear set, the second gear set and the transmission shaft respectively, and wear-resisting and friction-reducing layers are arranged on the installation faces. The wear-resistant antifriction layer is arranged on the mounting surface, so that the problem of poor wear resistance of the differential mechanism is effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle accessories, and in particular relates to a differential and a vehicle differential transmission system comprising the differential. Background Art

[0002] With the advancement of various technologies and the improvement of people's needs, the vehicle's ability to adapt to road conditions and acceleration capabilities are getting stronger and stronger. For example, through intelligent braking control of the left and right wheels, the output power of the vehicle under differential can be greater, and it can easily cope with the situation when the adhesion of one side of the wheel is very low; new energy vehicles use the low-speed full-torque output capacity and rapid response ability of the motor to improve the vehicle's acceleration ability and average driving speed. These changes have put higher demands on the vehicle's transmission system, and the differential is one of them. The above-mentioned higher-power differential use, greater acceleration torque and higher average driving speed make the differential's operating conditions more severe: greater torque, higher speed, and longer use time. This in turn makes the possibility of wear problems in the internal parts of the differential greater. Therefore, how to improve the wear resistance of the internal parts of the differential has become a technical problem that needs to be solved urgently. Utility Model Content

[0003] The utility model provides a differential and a vehicle differential transmission system comprising the differential, so as to improve the anti-wear capability of the differential.

[0004] In order to solve or improve the above technical problems to a certain extent, a differential is provided according to the utility model, comprising: a housing, a first gear set and a second gear set;

[0005] Wherein, the first gear set and the second gear set are disposed in the cavity of the housing, and the first gear set is meshed with the second gear set;

[0006] The housing is provided with shaft holes on two opposite sides, the shaft holes are both connected to the cavity, and the shaft holes are used for the transmission shaft to extend into the cavity;

[0007] The inner wall of the housing includes mounting surfaces corresponding to the first gear set, the second gear set and the transmission shaft respectively, and a wear-resistant and friction-reducing layer is arranged on the mounting surfaces.

[0008] In some embodiments, the wear-resistant and friction-reducing layer is attached to the inner wall of the shell by spraying.

[0009] In some embodiments, the second gear set is used to connect to a transmission shaft extending into the cavity, and both the first gear set and the second gear set are bevel gears.

[0010] In some embodiments, a first gear washer is disposed on the first gear set, and a second gear washer is disposed on the second gear set. The first gear washer and the second gear washer are in contact with the wear-resistant and friction-reducing layers corresponding to the first gear set and the second gear set, respectively.

[0011] In some embodiments, the first gear set includes a planet pin and a planet gear;

[0012] Wherein, the planetary pin shaft is penetrated through the housing, the planetary gear is connected to the planetary pin shaft, and the first gear gasket is arranged on the planetary gear and is located at a corresponding position between the planetary gear and the mounting surface.

[0013] In some embodiments, the mounting surface corresponding to the first gear set and the first gear gasket facing the inner wall of the housing are configured as spherical structures; and / or

[0014] The mounting surface corresponding to the second gear set and the side of the second gear gasket facing the inner wall of the housing are configured as a plane or a spherical structure.

[0015] In some embodiments, the second gear gaskets include a plurality of groups, and at least some of the gaskets in the plurality of groups of the second gear gaskets have different thicknesses.

[0016] In some embodiments, at least one window communicating with the cavity is formed on the shell, so that lubricating oil can enter the cavity through the window.

[0017] In some embodiments, shaft journals are provided at opposite ends of the housing, the shaft journals are provided with the shaft holes, and bearings are respectively provided on the shaft journals, so that the differential housing is rotatably connected to the vehicle through the bearings.

[0018] According to another aspect of the present invention, there is provided a vehicle differential transmission system, comprising a reduction gear, a transmission shaft and the differential described in any one of the above embodiments;

[0019] Wherein, the reduction gear is fixedly connected to the outer side of the housing of the differential to drive the differential to rotate, and the transmission shaft extends into the cavity of the housing through the shaft hole and is connected to the second gear set.

[0020] According to another aspect of the present invention, a vehicle is provided, comprising the vehicle differential transmission system described in the above embodiment.

[0021] The differential of the utility model is provided with a wear-resistant and friction-reducing layer on the inner wall of the cavity of the housing to improve the wear resistance of the differential, and can also reduce the friction coefficient of the inner wall of the cavity, improve the transmission efficiency of the differential, and can also suppress the generation of noise of the differential. In addition, since the hardness of the differential housing is low and it is easy to wear, the wear will cause noise, unbalanced load, jamming, low cleanliness and other problems, and then lead to more serious functional failure and durability problems. Therefore, the mounting surface is the weakest part of the wear resistance in the differential system. The wear-resistant and friction-reducing layer is arranged on the mounting surfaces corresponding to the first gear set, the second gear set and the transmission shaft of the inner wall of the differential housing, that is, the wear-resistant and friction-reducing layer is arranged only at the position where the friction surface exists. On the one hand, the improvement of wear resistance is very efficient compared with the existing measures. On the other hand, the process is simple, easy to operate, and low in cost. In addition, it is implemented on the welded differential with basically no side effects.

[0022] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a differential housing according to an embodiment of the utility model;

[0024] Figure 2 It is a schematic cross-sectional structure diagram of a differential housing according to an embodiment of the utility model;

[0025] Figure 3 It is a cross-sectional structural schematic diagram of a differential according to an embodiment of the utility model;

[0026] Figure 4 It is a partial cross-sectional structural schematic diagram of a differential according to an embodiment of the utility model.

[0027]

Explanation of symbols

[0028] 1. Differential housing

[0029] 10. Cavity

[0030] 11. Shaft hole

[0031] 12. Mounting surface

[0032] 120. First gear set mounting surface

[0033] 121. Second gear set mounting surface

[0034] 122. Transmission shaft mounting surface

[0035] 13. Open windows

[0036] 14. Journal

[0037] 2. First gear set

[0038] 20. Planetary pin

[0039] 21. Planetary gear

[0040] 3. Second gear set

[0041] 4. First gasket

[0042] 5. Second gasket

[0043] 6. Bearings

[0044] 100. Differential

[0045] 200. Reduction gear

[0046] 300. Drive shaft DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the present invention, the following is a detailed description of the specific implementation and effects of a differential and a vehicle including the same proposed by the present invention in combination with the accompanying drawings and preferred embodiments.

[0048] According to an embodiment of the present utility model, a differential 100 is provided, such as Figure 1-3 As shown, it includes a housing 1 , a first gear set 2 and a second gear set 3 .

[0049] like Figure 1 As shown, the housing 1 has a cavity 10 , and shaft holes 11 communicating with the cavity 10 of the housing 1 are formed on opposite sides of the housing 1 , and the transmission shaft 300 of the vehicle is inserted into the cavity 10 of the housing 1 through the shaft holes 11 .

[0050] Optionally, the transmission shaft 300 is a half shaft, one end of which extends into the cavity 10 of the housing 1 through the shaft hole 11, and the other end of the half shaft is connected to the wheel of the vehicle.

[0051] like Figure 1 and Figure 2 As shown, the inner wall of the housing 1 includes mounting surfaces 12 corresponding to the first gear set 2, the second gear set 3 and the transmission shaft 300. The mounting surfaces 12 are friction surfaces where the inner wall of the housing 1 contacts the first gear set 2, the second gear set 3 and the transmission shaft 300 respectively.

[0052] Optionally, the mounting surface 12 at least includes a first gear set mounting surface 120 , a second gear set mounting surface 121 and a transmission shaft mounting surface 122 .

[0053] like Figure 1 and Figure 2 The transmission shaft mounting surface 122 is located on the inner wall of the shaft hole 11 provided on the housing 1 .

[0054] In order to improve the wear resistance of the inner wall of the housing 1 of the differential 100, a wear-resistant and friction-reducing layer is provided on the mounting surface 12 on the inner wall of the housing 1. The wear-resistant and friction-reducing layer allows the friction coefficient of the mounting surface 12 to be maintained at a low level for a long time. Before the wear-resistant and friction-reducing layer is worn, the inner wall of the housing 1 of the differential 100 will not be damaged. At the same time, since the wear-resistant and friction-reducing layer has strong wear resistance, the mounting surface 12 can withstand friction with high relative speed and high contact pressure for a long time, the wear amount can be greatly reduced, and the wear resistance of the differential 100 assembly can be greatly enhanced.

[0055] In one embodiment, the wear-resistant and friction-reducing layer is attached to the inner wall of the housing 1 by spraying. Specifically, the wear-resistant and friction-reducing layer is attached to each mounting surface 12 of the inner wall of the housing 1 .

[0056] Optionally, the thickness of the wear-resistant and friction-reducing layer is controlled within 20 μm, so as to increase the wear resistance of the inner wall of the differential housing 100 without changing the size of the differential housing 1 and other components, without redesigning the mold, and without increasing the cost of the differential 100.

[0057] Before spraying the wear-resistant and friction-reducing layer, the housing 1 of the differential 100 is degreased, sandblasted, chemically treated and cleaned. First, the workpiece is preheated, and then the coating is evenly sprayed on the surface of the inner wall of the housing 1. After the first spraying is completed, after drying and curing, the second spraying is performed so that the coating is adsorbed on the surface of the inner wall of the housing 1.

[0058] Optionally, the wear-resistant and friction-reducing layer adopts a solid lubricant compound solution (materials include MoS2, graphite, fluorinated graphite, PTFE, etc.), which improves the wear resistance of the mounting surface 12 while reducing the friction coefficient of the mounting surface 12 (CoF<0.1).

[0059] like Figure 3 As shown, the first gear set 2 and the second gear set 3 are both disposed in the cavity 10 of the housing 1 of the differential 100 , and the first gear set 2 and the second gear set 3 are meshed with each other.

[0060] Optionally, both the first gear set 2 and the second gear set 3 are bevel gears, that is, the bevel gears are meshed and driven between the first gear set 2 and the second gear set 3 to ensure the transmission efficiency and transmission stability between the first gear set 2 and the second gear set 3.

[0061] like Figure 3As shown, the second gear set 3 is connected to the transmission shaft 300 extending into the cavity 10 of the housing 1, so that the power is transmitted to the transmission shaft 300 through the second gear set 3 and finally transmitted to the wheels of the vehicle.

[0062] Optionally, the second gear set 3 and the transmission shaft 300 are connected via a spline to ensure that the force at the connection between the second gear set 3 and the transmission shaft 300 is more uniform and to ensure the transmission of high torque.

[0063] In one embodiment, if Figure 3 As shown, a first gear gasket 4 is provided on the first gear set 2, and a second gear gasket 5 is provided on the second gear set 3, wherein the first gear gasket 4 and the second gear gasket 5 are in contact with the wear-resistant and friction-reducing layers corresponding to the first gear set 2 and the second gear set 3 respectively.

[0064] In this embodiment, by respectively arranging the first gear gasket 4 and the second gear gasket 5 at corresponding positions of the first gear set 2 and the second gear set 3, it is possible to effectively avoid the friction between the gears and the gear housing 1 during rotation, thereby effectively improving the service life of the housing 1 and effectively preventing the housing 1 from sintering, noise, etc. due to wear.

[0065] Optionally, the second gear gasket 5 includes multiple groups, and at least a portion of the gaskets in the multiple groups of second gear gaskets 5 have different thicknesses. The tooth side clearance between the second gear set 3 and the first gear set 2 can be adjusted by using second gear gaskets 5 of different thicknesses, so that the first gear set 2 and the second gear set 3 have higher meshing strength and lower transmission noise.

[0066] like Figure 3 and Figure 4 As shown, the first gear set 2 includes a planetary pin 20 and a planetary gear 21. The two ends of the planetary pin 20 are respectively penetrated on the housing 1, the planetary gear 21 is connected to the planetary pin 20, and the first gear gasket 4 is arranged on the planetary gear 21 and is located at a position corresponding to the planetary gear 21 and its corresponding mounting surface 12 (i.e., the first gear set mounting surface 120).

[0067] In one embodiment, if Figure 3 As shown, the mounting surface 12 corresponding to the first gear set 2 (ie, the first gear set mounting surface 120 ), the first gear washer 4 , and the side of the planetary gear 21 facing the inner wall of the housing 1 are all configured as spherical structures.

[0068] In this embodiment, by setting the first gear set mounting surface 120, the first gear gasket 4 and the side of the inner wall of the planetary gear 21 facing the housing 1 as spherical structures, it can play a positioning role during the installation of the planetary gear 21, ensure the accuracy of the installation position of the planetary gear 21, and further ensure the correct engagement between the planetary gear 21 and the second gear set 3.

[0069] Optionally, the mounting surface 12 corresponding to the second gear set 3 (i.e., the second gear set mounting surface 121), the second gear gasket 5, and the side of the second gear set 3 facing the inner wall of the shell 1 can be set to a spherical structure or a planar structure, but the present invention is not limited thereto.

[0070] In one embodiment, at least one window 13 connected to the cavity 10 of the shell 1 is provided on the shell 1, and the first gear set 2, the second gear set 3 and other parts can be installed through the window 13, and the lubricating oil can enter the cavity 10 through the window 13 to form a lubricating oil film on each sliding surface (such as each mounting surface 12) in the shell 1.

[0071] In one embodiment, if Figure 3 and Figure 4 As shown, journals 14 are provided on opposite sides of the housing 1. The journals 14 are hollow structures, which are formed into shaft holes 11 for the transmission shaft 300 to pass through. Bearings 6 are also provided on the outer periphery of the journals 14, and the differential 100 is connected to the vehicle body through the bearings 6, so that the differential 100 is rotatably connected to the vehicle body.

[0072] Another embodiment of the present invention provides a vehicle differential transmission system, comprising a reduction gear 200, a transmission shaft 300 and the differential 100 described in any one of the above embodiments.

[0073] The reduction gear 200 is fixedly connected to the outer side of the housing 1 of the differential 100 by welding or bolting to drive the differential 100 to rotate. The transmission shaft 300 extends into the cavity 10 of the housing 1 through the shaft hole 11 and is connected to the second gear set 3.

[0074] The kinetic energy generated by the vehicle's engine or motor is decelerated by the reduction gear 200 and then transmitted to the housing 1 of the differential 100, so that the differential 100 rotates. The rotation of the housing 1 drives the first gear set 2 to rotate, and then drives the second gear set 3 to rotate. The rotation of the second gear set 3 drives the drive shaft 300 connected thereto to rotate, and finally the power is transmitted to the wheels through the drive shaft 300.

[0075] Another embodiment of the present invention provides a vehicle, comprising the vehicle differential transmission system described in the above embodiment.

[0076] The differential of the utility model is provided with a wear-resistant and friction-reducing layer on the inner wall of the cavity of the housing to improve the wear resistance of the differential, and can also reduce the friction coefficient of the inner wall of the cavity, improve the transmission efficiency of the differential, and can also suppress the generation of noise of the differential. In addition, since the hardness of the differential housing is low and it is easy to wear, the wear will cause noise, unbalanced load, jamming, low cleanliness and other problems, and then lead to more serious functional failure and durability problems. Therefore, the mounting surface is the weakest part of the wear resistance in the differential system. The wear-resistant and friction-reducing layer is arranged on the mounting surfaces corresponding to the first gear set, the second gear set and the transmission shaft of the inner wall of the differential housing, that is, the wear-resistant and friction-reducing layer is arranged only at the position where the friction surface exists. On the one hand, the improvement of wear resistance is very efficient compared with the existing measures. On the other hand, the process is simple, easy to operate, and low in cost. In addition, it is implemented on the welded differential with basically no side effects.

[0077] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A differential, characterized in that: include: a housing, a first gear set and a second gear set; Wherein, the first gear set and the second gear set are disposed in the cavity of the housing, and the first gear set is meshed with the second gear set; The housing is provided with shaft holes on two opposite sides, the shaft holes are both connected to the cavity, and the shaft holes are used for the transmission shaft to extend into the cavity; The inner wall of the housing includes mounting surfaces corresponding to the first gear set, the second gear set and the transmission shaft respectively, and a wear-resistant and friction-reducing layer is arranged on the mounting surfaces.

2. The differential according to claim 1, characterized in that: The wear-resistant and friction-reducing layer is attached to the inner wall of the shell by spraying.

3. The differential according to claim 1, characterized in that: The second gear set is used to connect the transmission shaft extending into the cavity, and the first gear set and the second gear set are both bevel gears.

4. The differential according to claim 1, characterized in that: The first gear set is provided with a first gear washer, and the second gear set is provided with a second gear washer. The first gear washer and the second gear washer are in contact with the wear-resistant and friction-reducing layers corresponding to the first gear set and the second gear set, respectively.

5. The differential according to claim 4, characterized in that: The first gear set includes a planetary pin and a planetary gear; Wherein, the planetary pin shaft is penetrated on the housing, the planetary gear is connected to the planetary pin shaft, and the first gear gasket is arranged on the planetary gear and is located at the corresponding position of the planetary gear and the mounting surface.

6. The differential according to claim 5, characterized in that: The mounting surface corresponding to the first gear set and the first gear gasket facing the inner wall of the housing are configured as spherical structures; and / or The mounting surface corresponding to the second gear set and the side of the second gear gasket facing the inner wall of the housing are configured as a plane or a spherical structure.

7. The differential according to claim 4, characterized in that: The second gear gaskets include a plurality of groups, and at least some of the gaskets in the plurality of groups of the second gear gaskets have different thicknesses.

8. The differential according to claim 1, characterized in that: The shell is provided with at least one window communicating with the cavity, so that lubricating oil can enter the cavity through the window.

9. The differential according to claim 1, characterized in that: The housing is provided with journals at opposite ends, the shaft holes are provided on the journals, and bearings are provided on the journals respectively, so that the differential housing is rotatably connected to the vehicle through the bearings.

10. A vehicle differential transmission system, characterized in that: A differential comprising a reduction gear, a transmission shaft and any one of claims 1 to 9; Wherein, the reduction gear is fixedly connected to the outer side of the housing of the differential to drive the differential to rotate, and the transmission shaft extends into the cavity of the housing through the shaft hole and is connected to the second gear set.

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