Differential and vehicle

Abstract

The utility model relates to a kind of differential and vehicle, its shell is fixedly connected by welding with main reduction gear, shell is constituted by two half shells and is respectively installed in the axial both sides end surface of main reduction gear. Fixed part for and half shell welding is equipped on the axial both sides end surface of main reduction gear, and positioning part spaced apart from fixed part welding area in radial direction is also equipped, and positioning part supports half shell when welding. The technical scheme will positioning part and welding area be spaced apart, avoid the influence of positioning accuracy by heat distortion generated in welding process, can effectively improve the assembly accuracy and overall performance of differential, ensure the reliable operation of differential.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission equipment technology, and in particular to a differential structure and its application in a vehicle transmission system. As a key component of a vehicle transmission system, the performance of the differential directly affects the vehicle's power transmission, handling stability, and driving safety. This utility model aims to improve the overall performance of the differential by optimizing its welding method, component connection structure, and overall layout, thereby meeting the high-performance requirements of the transmission system under different operating conditions. Background Technology

[0002] In the field of mechanical transmission equipment technology, the differential is a key component of the vehicle transmission system, and its performance is crucial to the vehicle's power transmission, handling stability, and driving safety. Currently, there are various design schemes for the connection between the differential housing and the main reduction gear in existing technologies. For example, in one existing scheme (such as the scheme disclosed in patent CN212377235U), the main reduction gear and housing are designed as a single piece, manufactured through forging. This structure complicates the machining process, requiring extensive post-processing of both the main reduction gear and housing after forging, resulting in a large machining allowance. This not only wastes material and reduces material utilization but also significantly increases manufacturing costs. Furthermore, the asymmetrical suspension structure of the main reduction gear causes significant deformation during heat treatment due to its structural characteristics. This greatly increases the difficulty of precision machining of the heated gear, making it difficult to guarantee gear accuracy and thus affecting the overall performance of the differential. Another existing scheme designs the housing as two half-housings, each welded to the radial inner end of the main reduction gear. While this scheme solves some of the technical problems caused by the integration of the main reduction gear and housing, such as excessive machining complexity and low material utilization, it is still a significant improvement. However, the welding position coincides with the positioning position of the housing on the main reduction gear. During the welding process, the heat generated causes deformation of the positioning reference of both the housing and the main reduction gear. This deformation directly leads to a decrease in gear accuracy, affecting the meshing effect between gears in the differential, and consequently reducing the transmission efficiency and reliability of the differential, failing to meet the high precision requirements of the differential under complex operating conditions.

[0003] Therefore, the existing differential structure designs all have certain defects and cannot simultaneously meet the requirements of high precision, low cost and high reliability of differentials. There is an urgent need for a new differential structure design to solve these problems and improve the overall performance of differentials. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an improved differential that can overcome the problems in the prior art, reduce manufacturing costs while improving the fitting accuracy of differential components, thereby improving the overall performance of the differential.

[0005] This invention solves the aforementioned technical problems through a differential. The differential's housing is fixedly connected to the main reduction gear by welding. The housing consists of two half-housings, each mounted on one of the axial end faces of the main reduction gear. The axial end faces of the main reduction gear have fixing parts for welding to the half-housings, and also positioning parts spaced radially from the welding area of ​​the fixing parts. These positioning parts support the half-housings during welding. This technical solution, by spacing the positioning parts from the welding area, avoids thermal deformation during welding affecting positioning accuracy, effectively improving the differential's assembly accuracy and overall performance, and ensuring reliable operation of the differential.

[0006] According to the preferred design of this utility model, the positioning part of the differential is a flange extending axially from the radial interior of the main reduction gear. This flange structure is very easy to process and can provide stable support for the half-shell during welding, making it less prone to displacement and wobbling during welding. This further improves the welding accuracy and quality, ensures the fitting accuracy between the various components of the differential, and thus enhances the working stability and reliability of the differential. More preferably, the flange of the differential protrudes axially from the main reduction gear body by 5 to 6 mm, and the flange wall thickness is 5 to 8 mm. This size design ensures that the flange has sufficient strength to support the half-shell without increasing material costs and the overall weight of the differential due to excessive size.

[0007] According to a preferred design of this utility model, the fixing part of the differential is an axially projecting ring protruding from both axial end faces, and the axial end face of the half-shell contacts the fixing part axially. This axial contact design increases the contact area between the half-shell and the fixing part, making the weld more robust, able to withstand greater torque and force, and improving the overall strength and reliability of the differential. A welding area is provided radially outside the fixing part, and a support part is provided radially inside, making it easier to separate the welding area and the positioning area. More preferably, the axial end of the differential half-shell has a bent portion, and the positioning part is snapped into the bent portion, radially supporting the half-shell. This snap-fit ​​structure better restricts the position of the half-shell during welding, preventing it from shifting, thereby improving the welding accuracy and quality, and ensuring the performance and reliability of the differential. In addition to the above solutions, the fixing part of the differential can also be a flange protruding from both axial end faces, with the end of the half-shell contacting the fixing part radially. The radial contact method provides flexible design possibilities, allowing the contact method with the fixing part to be specifically designed according to the shape of the half-shell end.

[0008] According to the preferred design of this utility model, the differential has a triangular weld seam in the welding area where the half-shell contacts the fixed part, and the weld seam depth is 2 to 4 mm, particularly preferably 3 mm. The triangular weld seam structure increases the strength and stability of the weld, ensuring a firm and reliable connection between the half-shell and the fixed part. Alternatively, the differential's half-shell and the main reduction gear are welded using laser or electron beam welding. Laser or electron beam welding has advantages such as high energy density, fast welding speed, and small heat-affected zone, which can reduce thermal deformation during welding, ensure welding accuracy, and improve welding quality, thereby enhancing the overall performance and reliability of the differential. Furthermore, it is also possible that the two half-shells of the differential are completely symmetrical. A symmetrical shell design simplifies the manufacturing process of the differential, facilitates mass production, and reduces production costs.

[0009] The technical problem to be solved by this utility model can also be solved by a vehicle that incorporates any of the above-mentioned technical solutions for the differential. This vehicle can benefit from the high-precision assembly, high reliability, and good performance of the differential, resulting in better power transmission efficiency, stability, and comfort during driving. Attached Figure Description

[0010] The present invention will now be described in more detail with reference to the accompanying drawings, but this does not limit the overall concept of the invention.

[0011] Figure 1 A cross-sectional schematic diagram of a differential designed according to this utility model is shown.

[0012] In this utility model, unless otherwise specified, "axial", "radial" and "circumferential" are all relative to the main reduction gear. Detailed Implementation

[0013] Figure 1 A cross-sectional view of a differential designed according to this utility model is shown. The differential includes a housing 1 and a main reduction gear 2. The main reduction gear 2 has an external toothed portion located radially outward and a hollow portion located radially inward. A pivot pin 6 is radially supported at the center of the hollow portion, and a planetary gear assembly is supported by the pivot pin 6. The planetary gear assembly has planetary gears 3 and a sun gear 4. A gear washer 5 is provided between the sun gear 4 and the housing 1.

[0014] One existing technology integrates the main reduction gear and housing into a single unit. This structure is complex to manufacture, requiring forging to create a single piece. This results in increased machining allowances, low material utilization, and higher manufacturing costs. Furthermore, the asymmetrical suspension structure of the main reducer gear leads to significant deformation after heat treatment, increasing the difficulty of precision machining the heated gear. Another existing technology designs the housing as two halves, each welded to the radial inner end of the main reduction gear. While this solution addresses the technical challenges of integrating the main reduction gear and housing, the welding position coincides with the housing's positioning on the main reduction gear. This causes deformation of the positioning references for both the housing and the main reduction gear during welding, leading to decreased gear accuracy.

[0015] like Figure 1 As shown, the differential housing 1 and the main reduction gear 2 designed according to this utility model are separate designs, and are fixedly connected by welding. The housing 1 consists of two completely symmetrical half-housings 11 and 12, which are respectively installed on both axial sides of the main reduction gear 2. The half-housings 11 and 12 form a cavity for accommodating the planetary gear assembly. Fixing portions 21 are provided on both axial end faces of the main reduction gear 2 for fixing to the half-housings 11 and 12 by welding. A positioning portion 22 is also provided on the radially inner side of the fixing portion 21 for supporting the half-housings 11 and 12 during welding. The positioning portion 22 and the fixing portion 21 are radially spaced apart, thereby preventing changes in the positioning of the housing relative to the main reduction gear during welding.

[0016] According to a preferred embodiment of the present invention, the positioning part 22 is a flange located radially inside the main reduction gear 2 and extending axially, such as... Figure 1 As shown. The flange protrudes 5 to 6 mm axially from the main reduction gear 2 body, and the wall thickness of the positioning part 22 is 5 to 8 mm. Of course, other shapes of positioning parts can also be considered, as long as they can support the semi-shells 11 and 12 radially inward. For example... Figure 1 As shown, the fixing part 21 is a protruding ring provided on the axial end face. The axial end faces of the half-shells 11 and 12 are in axial contact with the protruding ring, and the radially inner end faces of the half-shells 11 and 12 are in radial contact with the positioning part 22. The fixing part 21 can also be designed in other forms, such as flanges protruding from the axial end faces of the main reduction gear 2, wherein the ends of the half-shells 11 and 12 are in radial contact with the fixing part 21.

[0017] like Figure 1As shown, the axial ends of the half-shells 11 and 12 have bent portions 13, and the positioning portion 22 is engaged within the bent portions 13. A triangular weld is provided in the welding area where the half-shells 11 and 12 contact the fixing portion 21, and the weld depth is 2 to 4 mm, especially 3 mm. The welding method is, for example, electron beam welding. The two half-shells 11 and 12 have completely identical structures. Pre-positioning is achieved through the cooperation of the positioning portion 22 and the bent portion 13. After welding, no further processing is required to ensure that the half-shells 11 and 12 are fixed on the main reduction gear 2. Furthermore, since the positioning portion 22 is far from the welding area, the welding process does not affect the position of the shell 1 relative to the main reduction gear 2, thus improving assembly accuracy.

[0018] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

[0019] List of reference numerals

[0020] 1. Shell

[0021] 2. Main reduction gear

[0022] 3 Planetary gears

[0023] 4 Sun Gear

[0024] 5 Gear Washers

[0025] 6-axis pin

[0026] 11. Half-shell

[0027] 12 half-shells

[0028] 13. Bending section

[0029] 21 Fixing part

[0030] 22. Positioning Department.

Claims

1. A differential, comprising a housing (1) and a main reduction gear (2), wherein the housing (1) and the main reduction gear (2) are fixedly connected by welding, the housing (1) being composed of two half-housings (11, 12), the half-housings (11, 12) being respectively mounted on the axial end faces of the main reduction gear, wherein, The main reduction gear (2) has a fixing part (21) on each of the two end faces on the axial sides for welding with the half housing (11, 12). The main reduction gear (2) also has a positioning part (22) that is radially spaced from the welding area of ​​the fixing part (21). The positioning part (22) is used to support the half housing (11, 12) during welding.

2. The differential according to claim 1, characterized in that, The positioning part (22) is an axially extending flange located radially inside the main reduction gear (2).

3. The differential according to claim 2, characterized in that, The flange protrudes 5 to 6 mm axially from the main reduction gear (2) body, and the flange wall thickness is 5 to 8 mm.

4. The differential according to claim 2, characterized in that, The fixing part (21) is an axial protrusion ring protruding from both axial end faces, wherein the axial ends of the half-shell (11, 12) are in axial contact with the fixing part (21).

5. The differential according to claim 4, characterized in that, The axial ends of the semi-shells (11, 12) have a bent portion (13), and the positioning portion (22) is engaged in the bent portion (13).

6. The differential according to claim 2, characterized in that, The fixing part (21) is a flange protruding from the two end faces on both sides of the axial direction, wherein the ends of the half-shells (11, 12) are in radial contact with the fixing part (21).

7. The differential according to any one of claims 1 to 6, characterized in that, A weld with a triangular cross-section is provided in the welding area where the semi-shell (11, 12) contacts the fixing part (21), and the weld depth is 2 to 4 mm.

8. The differential according to any one of claims 1 to 6, characterized in that, The semi-shells (11, 12) are welded to the main reduction gear (2) by laser or electron beam welding.

9. The differential according to any one of claims 1 to 6, characterized in that, The two semi-shells (11, 12) are completely symmetrical shells.

10. A vehicle, characterized in that, The vehicle includes a differential according to any one of claims 1-9.

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