Differential assembly

Abstract

The utility model discloses a differential mechanism assembly which comprises a half axle gear and a differential mechanism shell, a first gasket, a second gasket and a third gasket are arranged between the half axle gear and the differential mechanism shell, the first gasket is in contact with the differential mechanism shell, and the third gasket is in contact with the half axle gear. The second gasket is located between the first gasket and the third gasket. According to the differential assembly, the relative rotating speed difference among the half axle gear, the third gasket, the second gasket, the first gasket and the differential shell is smaller, the problem of ablation or abnormal abrasion faults of the differential assembly can be solved, the service life of the differential assembly is prolonged, and the differential assembly is simple in overall structure and convenient to produce on a large scale.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission devices, and specifically relates to a differential assembly. Background Art

[0002] As automobile manufacturers place increasingly higher demands on transmission assemblies and reducer assemblies, high-speed figure-eight tests are usually performed during vehicle factory inspections, and S-curve tests are added during vehicle road tests.

[0003] Due to the harshness of vehicle testing conditions and experimental conditions, the differential assembly often causes ablation or abnormal wear, and has a short service life. This is mainly because the existing differential assembly has structural design defects. When the differential assembly is working, the half-shaft gear will have a large axial force pressing against the differential housing. At the same time, there will be a large speed difference between the half-shaft gear and the differential housing. At this time, the gasket between the half-shaft gear and the differential housing will play a role in reducing the speed. When the half-shaft gear rotates at high speed, it will drive the gasket to rotate through axial force and friction. In this way, there will be a relative speed difference between the half-shaft gear and the gasket, and there will also be a relative speed difference between the gasket and the differential housing, thereby achieving the effect of reducing the relative speed difference, reducing wear and ablation. However, only one gasket is set between the half-shaft gear and the differential housing, and the effect of reducing wear and ablation is relatively limited.

[0004] For example, the patent document with publication number CN104675953A discloses a differential assembly, which has a differential case A, and the differential case A is butt-jointed with the differential case B. The cavity surrounded by the differential case A and the differential case B contains a cross shaft, a gear pair, a planetary gear, and a side gear; the characteristic is that a gasket is also installed between the outside of the side gear and the housing. The technical solution disclosed in the patent document also has the above-mentioned technical problems. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a differential assembly, the purpose of which is to increase the service life.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a differential assembly, including a half-shaft gear and a differential housing, a first gasket, a second gasket and a third gasket are arranged between the half-shaft gear and the differential housing, the first gasket is in contact with the differential housing, the third gasket is in contact with the half-shaft gear, and the second gasket is located between the first gasket and the third gasket.

[0007] The first gasket and the third gasket have the same structure.

[0008] The thickness of the first gasket and the third gasket is 1±0.015 mm.

[0009] The thickness of the second gasket is 0.8-1.6 mm.

[0010] The first gasket and the third gasket are provided with a first oil hole, the second gasket is provided with a second oil hole, and the distance between the first oil hole and the axis of the side gear is greater than the distance between the second oil hole and the axis of the side gear.

[0011] A spherical gasket is arranged between the differential housing and the planetary gear.

[0012] The differential assembly of the utility model has a smaller relative speed difference among the half-shaft gears, the third gasket, the second gasket, the first gasket and the differential housing, which can solve the problem of ablation or abnormal wear of the differential assembly and increase the service life of the differential assembly. In addition, the overall structure of the differential assembly is simple, which is convenient for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] This specification includes the following drawings, which show the following contents:

[0014] Figure 1 It is a cross-sectional view of the differential assembly of the utility model;

[0015] Figure 2 is a schematic diagram of the structure of the first gasket and the third gasket;

[0016] Figure 3 is a schematic diagram of the structure of the second gasket;

[0017] Markings in the figure are: 1, differential case; 2, first gasket; 3, second gasket; 4, third gasket; 5, half-shaft gear; 6, fixing pin; 7, planetary gear shaft; 8, spherical gasket; 9, planetary gear. DETAILED DESCRIPTION

[0018] The specific implementation methods of the utility model are further explained in detail below with reference to the accompanying drawings through the description of embodiments, with the aim of helping technicians in the field to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model and facilitating its implementation.

[0019] It should be noted that, in the following embodiments, the “first”, “second” and “third” mentioned do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0020] like Figure 1As shown, the utility model provides a differential assembly, including a planetary gear shaft 7, two planetary gears 9, two side gears 5 and a differential case 1. The planetary gears 9 and the side gears 5 are located inside the differential case 1, the planetary gears 9 and the side gears 5 are meshed, the two planetary gears 9 are coaxially arranged, the two side gears 5 are coaxially arranged, and the two planetary gears 9 are mounted on the planetary gear shaft 7. A first gasket 2, a second gasket 3 and a third gasket 4 are arranged between the side gears 5 and the differential case 1, the first gasket 2 is in contact with the differential case 1, the third gasket 4 is in contact with the side gears 5, and the second gasket 3 is located between the first gasket 2 and the third gasket 4.

[0021] Specifically, if Figure 1 and Figure 2 As shown, the first gasket 2 and the third gasket 4 have the same structure, and the thickness of the first gasket 2 and the third gasket 4 is 1±0.015 mm.

[0022] The thickness of the second gasket 3 is 0.8-1.6mm. The thinner it is, the more difficult it is to process, and the cost will also increase. If it is too thick, it is difficult to drive the gasket to rotate by friction when the half-shaft gear 5 rotates. It is difficult to improve the relative speed difference, and abnormal wear is inevitable. The second gasket has different thicknesses, which can be 0.8, 0.85, 0.9, 0.95...1.60. The thickness of the second gasket can be selected. Different thickness second gaskets can be selected according to the gap between the differential housing and the half-shaft gear, so that the gap between the differential housing and the half-shaft gear is controlled within the range of 0.06-0.18mm.

[0023] like Figures 1 to 3 As shown, the first gasket 2 and the third gasket 4 are annular structures, and a plurality of first oil holes are arranged on the first gasket 2 and the third gasket 4. All the first oil holes on the first gasket 2 are evenly distributed along the circumference, and the first oil holes are used to allow oil to pass through. The second gasket 3 is annular structure, and a plurality of second oil holes are arranged on the second gasket 3. All the second oil holes on the second gasket 3 are evenly distributed along the circumference, and the second oil holes are used to allow oil to pass through. The distance between the first oil hole and the axis of the side gear 5 is greater than the distance between the second oil hole and the axis of the side gear 5. That is, the structural difference between the second gasket 3 and the first gasket 2 and the third gasket 4 is that the positions of the center lines of the oil holes are not on the same circumference, and there are multiple specifications of thickness, which can be used to adjust the gap between the side gear 5 and the differential housing 1.

[0024] After testing, it was found that three sets of gaskets were set between the side gear 5 and the differential case 1, which had the best effect and could meet various verification conditions. The installation space of the side gear 5 inside the differential case 1 is limited, and the strength of the side gear 5 and the differential case 1 must be taken into account. Therefore, the smaller the gap between the side gear 5 and the differential case 1, the better (the number of gaskets should be as small as possible), so that the overall structure of the differential can be more compact while taking into account the strength.

[0025] When the differential assembly is working, the half-shaft gear 5 will have a large axial force pressing against the differential case 1, and there will also be a large speed difference between the half-shaft gear 5 and the differential case 1. At this time, the three gaskets between the half-shaft gear 5 and the differential case 1 will play a key role in reducing the considerable speed. When the half-shaft gear 5 rotates at high speed, it will drive the third gasket 4 to rotate through axial force and friction force, so that there will be a relative speed difference between the half-shaft gear 5 and the third gasket 4, a relative speed difference between the third gasket 4 and the second gasket 3, a relative speed difference between the second gasket 3 and the first gasket 2, and a relative speed difference between the first gasket 2 and the differential case 1, thereby achieving the purpose of gradually reducing the relative speed difference, thereby completely solving the problem of abnormal wear and ablation of the differential assembly. (Abnormal wear is caused by the friction caused by large axial force plus large speed difference; ablation is caused by large axial force plus large speed difference, and a large amount of heat generated during friction cannot be eliminated)

[0026] like Figure 1 As shown, a spherical washer 8 is arranged between the differential housing 1 and the planetary gear.

[0027] The assembly process of the differential assembly is as follows:

[0028] Step 1: Place two half-shaft gears 5 into the differential case 1, then install two spherical washers 8 and two planetary gears 9 into the differential case 1, and then fix the spherical washers 8 and the planetary gears 9 in the differential case 1 through the planetary gear shaft 7;

[0029] Step 2: Use equipment or tooling to detect the clearances between the side gears 5 and the differential housing 1 on both sides, and select three types of gaskets, namely, the first gasket 2, the second gasket 3 and the third gasket 4, according to the size of the clearances;

[0030] Step 3: Remove the planetary gear shaft 7 from the differential case 1, then take out the spherical gasket 8 and the planetary gear 9 respectively, and finally take out the axle gear 5;

[0031] Step 4: Place the two half-shaft gears 5 and the corresponding three types of gaskets, the first gasket 2, the second gasket 3 and the third gasket 4 into the differential case 1, and then install the two spherical gaskets 8 and the two planetary gears 9 into the differential case 1 together, and then fix the spherical gaskets 8 and the planetary gears 9 in the differential case 1 through the planetary gear shaft 7, and finally fix the planetary gear shaft 7 to the differential case 1 through the fixing pin 6.

[0032] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A differential assembly, including axle gears and a differential housing, characterized in that: A first gasket, a second gasket and a third gasket are arranged between the side gear and the differential case, the first gasket is in contact with the differential case, the third gasket is in contact with the side gear, and the second gasket is located between the first gasket and the third gasket.

2. The differential assembly according to claim 1, characterized in that: The first gasket and the third gasket have the same structure.

3. The differential assembly according to claim 2, characterized in that: The thickness of the first gasket and the third gasket is 1±0.015 mm.

4. The differential assembly according to any one of claims 1 to 3, characterized in that: The thickness of the second gasket is 0.8-1.6 mm.

5. The differential assembly according to any one of claims 1 to 3, characterized in that: The first gasket and the third gasket are provided with a first oil hole, the second gasket is provided with a second oil hole, and the distance between the first oil hole and the axis of the side gear is greater than the distance between the second oil hole and the axis of the side gear.

6. The differential assembly according to any one of claims 1 to 3, characterized in that: A spherical gasket is arranged between the differential housing and the planetary gear.

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