Differential assembly

Abstract

The utility model relates to the technical field of differential mechanisms, in particular to a differential mechanism assembly which comprises an upper shell, a lower shell, a main reduction gear, a pin shaft, a pin shaft check ring and a transmission component. The end part of the pin shaft is riveted with the pin shaft check ring, so that the axial movement of the pin shaft can be prevented; the upper shell body and the lower shell body are formed in a stamping mode and then are machined, a conventional differential shell body is formed in a casting mode, the upper differential shell body and the lower differential shell body are stamping parts and are lighter than the conventional casting differential shell body, and the stamping production cycle of the upper differential shell body and the lower differential shell body is shorter than the casting production cycle of the conventional casting differential shell body. The machining period of the upper differential shell and the lower differential shell after stamping is shorter than the machining time of a conventional casting differential shell; the stamping production line has a smaller production site than a casting production line.

Description

Technical Field

[0001] This utility model relates to the field of differential technology, and in particular to a differential assembly. Background Technology

[0002] Currently, the mainstream manufacturing process for differential housings in differential assemblies still relies primarily on traditional casting technology. This casting process has several limitations: in terms of production cycle, each step, from mold design, sand mold preparation, alloy melting to casting, is complex and time-consuming, with the casting process alone potentially taking several days to weeks; furthermore, the surface finish and internal structure of the cast blank may not fully meet usage requirements, necessitating extensive machining processes such as cutting, grinding, and drilling, further extending the overall manufacturing cycle.

[0003] Furthermore, castings may have quality defects such as porosity, sand holes, and shrinkage, which affect the mechanical properties and service life of the differential housing, making it difficult to meet the urgent needs of modern manufacturing for efficient, environmentally friendly, and precise production. Utility Model Content

[0004] The purpose of this utility model is to provide a differential assembly that solves the problem that the differential housing of existing differential assemblies is generally cast, which has a long production cycle and a long machining cycle after casting.

[0005] To achieve the above objectives, this utility model provides a differential assembly, including an upper housing, a lower housing, a main reduction gear, a pin, a pin retaining ring, and a transmission component; the main reduction gear is fixedly connected to the lower housing and sleeved on the lower housing; the upper housing is fixedly connected to the lower housing and located on one side of the lower housing; the pin is connected to the upper housing and passes through the upper housing; the pin retaining ring is fixedly connected to the pin and located at one end of the pin; and the transmission component is disposed inside the upper housing and the lower housing.

[0006] The upper housing has a through hole that penetrates the upper housing and engages with the pin.

[0007] The transmission component includes a first planetary gear, a second planetary gear, a first half-shaft gear, and a second half-shaft gear. The first planetary gear is connected to the pin and is sleeved on the pin. The second planetary gear is connected to the pin and is sleeved on the pin. The first half-shaft gear is connected to the upper housing and meshes with the first planetary gear and the second planetary gear. The second half-shaft gear is connected to the lower housing and engages with the first planetary gear and the second planetary gear.

[0008] The transmission component further includes a first planetary gear washer, a second planetary gear washer, a first half-shaft gear washer, and a second half-shaft gear washer. The first planetary gear washer is connected to the upper housing and located between the upper housing and the first planetary gear. The second planetary gear washer is connected to the upper housing and located between the second planetary gear and the upper housing. The first half-shaft gear washer is connected to the upper housing and located between the upper housing and the first half-shaft gear. The second half-shaft gear washer is connected to the lower housing and located between the lower housing and the second half-shaft gear.

[0009] The differential assembly further includes an upper bearing retaining ring and a lower bearing retaining ring. The upper bearing retaining ring is fixedly connected to the upper housing and is sleeved on the upper housing; the lower bearing retaining ring is fixedly connected to the lower housing and is sleeved on the lower housing.

[0010] This utility model discloses a differential assembly. The upper and lower housings, when combined, form a cavity inside. A transmission component is disposed within this cavity, enabling differential movement of the two wheels to ensure smooth vehicle steering. The pin end is riveted to the pin retaining ring to prevent axial movement of the pin. The upper and lower housings are formed by stamping and then machined. While conventional differential housings are cast, the upper and lower differential housings of this utility model are stamped, making them lighter than conventional cast differential housings. Furthermore, the production cycle for stamping the upper and lower differential housings is shorter than that for casting. The machining cycle after stamping is also shorter than that for conventional cast differential housings. Additionally, the stamping production line requires less production space than a casting production line. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the overall structure of the differential assembly of this utility model.

[0013] Figure 2 This is a schematic diagram of the pin installation structure of this utility model.

[0014] Figure 3 This is a cross-sectional view of the differential assembly of this utility model.

[0015] Figure 4 This is a schematic diagram of the through hole structure of this utility model.

[0016] In the diagram: 1-Main reduction gear, 2-First planetary gear, 3-Pin shaft, 4-First planetary gear washer, 5-Upper housing, 6-First half-shaft gear, 7-First half-shaft gear washer, 8-Upper bearing retaining ring, 9-Second planetary gear, 10-Second planetary gear washer, 11-Pin shaft retaining ring, 12-Second half-shaft gear, 13-Second half-shaft gear washer, 14-Lower housing, 15-Lower bearing retaining ring, 16-Through hole. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0018] Please see Figures 1 to 4 ,in Figure 1 This is a schematic diagram of the overall structure of the differential assembly. Figure 2 This is a schematic diagram of the pin installation structure. Figure 3 This is a cross-sectional view of the differential assembly. Figure 4 This is a schematic diagram of a through hole.

[0019] This utility model provides a differential assembly, including an upper housing 5, a lower housing 14, a main reduction gear 1, a pin 3, a pin retaining ring 11, a transmission component, an upper bearing retaining ring 8, and a lower bearing retaining ring 15. The transmission component includes a first planetary gear 2, a second planetary gear 9, a first half-shaft gear 6, a second half-shaft gear 12, a first planetary gear washer 4, a second planetary gear washer 10, a first half-shaft gear washer 7, and a second half-shaft gear washer 13. The upper housing 5 has a through hole 16. By stamping the upper housing 5 and the lower housing 14, the production cycle of the differential is shortened, and the production space is reduced. It is understood that the aforementioned solution can be used to improve the processing efficiency of differentials.

[0020] In this specific embodiment, the main reduction gear 1 is fixedly connected to the lower housing 14 and sleeved on the lower housing 14. The upper housing 5 is fixedly connected to the lower housing 14 and located on one side of the lower housing 14. The pin 3 is connected to the upper housing 5 and passes through the upper housing 5. The pin retaining ring 11 is fixedly connected to the pin 3 and located at one end of the pin 3. The transmission component is disposed inside the upper housing 5 and the lower housing 14. After the upper housing 5 and the lower housing 14 are combined, a cavity is formed inside. The transmission component is disposed inside this cavity and is used to drive the wheels on both sides. The differential movement ensures smooth vehicle steering. The end of the pin 3 is riveted to the pin retaining ring 11 to prevent axial movement of the pin 3. The upper housing 5 and the lower housing 14 are formed by stamping and then machined. Conventional differential housings are cast, while the upper and lower differential housings of this invention are stamped parts, which are lighter than conventional cast differential housings. The production cycle of stamping the upper and lower differential housings is also shorter than that of casting the conventional cast differential housings. The machining cycle after stamping the upper and lower differential housings is also shorter than that of conventional cast differential housings. The stamping production line requires less production space than the casting production line.

[0021] The through hole 16 penetrates the upper housing 5 and engages with the pin 3; both the through hole 16 and the pin 3 are oval, which prevents the pin 3 from rotating circumferentially on the upper housing 5.

[0022] Secondly, the first planetary gear 2 is connected to the pin 3 and sleeved on the pin 3; the second planetary gear 9 is connected to the pin 3 and sleeved on the pin 3; the first half-shaft gear 6 is connected to the upper housing 5 and meshes with the first planetary gear 2 and the second planetary gear 9; the second half-shaft gear 12 is connected to the lower housing 14 and cooperates with the first planetary gear 2 and the second planetary gear 9; when the vehicle is traveling in a straight line, the gears work together to make the wheels on both sides move forward at the same speed; when turning, the speed difference of the gears is used to change the power transmission, so that the wheels on both sides rotate at different speeds. The differential structure is existing technology and will not be described in detail here.

[0023] Meanwhile, the first planetary gear shim 4 is connected to the upper housing 5 and located between the upper housing 5 and the first planetary gear 2; the second planetary gear shim 10 is connected to the upper housing 5 and located between the second planetary gear 9 and the upper housing 5; the first half-shaft gear shim 7 is connected to the upper housing 5 and located between the upper housing 5 and the first half-shaft gear 6; the second half-shaft gear shim 13 is connected to the lower housing 14 and located between the lower housing 14 and the second half-shaft gear 12. Through the first planetary gear shim 4, the second planetary gear shim 10, the first half-shaft gear shim 7, and the second half-shaft gear shim 13, the direct friction between the gears and the housing is reduced, the wear is reduced, and the overall service life of the differential assembly is improved. At the same time, the shims can play a certain buffering role, reducing the vibration and impact generated during gear transmission, making the differential operate more smoothly and quietly, and improving the driving comfort of the vehicle. In addition, the presence of the shims optimizes the fit clearance between the gears and the housing, ensuring the accuracy and stability of power transmission, and further improving the transmission efficiency of the differential.

[0024] In addition, the upper bearing retaining ring 8 is fixedly connected to the upper housing 5 and is sleeved on the upper housing 5; the lower bearing retaining ring 15 is fixedly connected to the lower housing 14 and is sleeved on the lower housing 14; the upper bearing retaining ring 8 and the lower bearing retaining ring 15 restrict the axial displacement of the bearing during the operation of the differential, avoid abnormal gear meshing due to bearing movement, and ensure smooth power transmission.

[0025] In this utility model, the differential assembly is assembled by installing the first half-shaft gear 6, the first half-shaft gear washer 7, the first planetary gear washer 4, the first planetary gear 2, the second planetary gear washer 10, and the second planetary gear 9 into the upper housing 5. Then, the pin 3 passes through the first planetary gear washer 4, the first planetary gear 2, the second planetary gear washer 10, and the second planetary gear 9. Next, the pin retaining ring 11 is installed on the pin 3 and riveted to prevent axial movement of the pin 3. The through hole 16 on the upper housing 5 prevents circumferential rotation of the pin 3. The lower housing 14 is pressed onto the main reduction gear 1, and then the first half-shaft gear 6, the first half-shaft gear washer 7, the first planetary gear washer 4, the first planetary gear 2, the second planetary gear washer 10, and the second planetary gear 9 are installed into the upper housing 5. The second half-shaft gear shim 13 and the second half-shaft gear 12 are placed on the lower housing 14; the assembled upper housing 5 is pressed onto the main reduction gear 1, and the upper housing 5 and the lower housing 14 are welded together by laser welding; finally, the upper bearing retaining ring 8 is pressed onto the upper housing 5, and the lower bearing retaining ring 15 is pressed onto the lower housing 14; this differential structure divides the differential housing into the upper housing 5 and the lower housing 14, and the upper housing 5 and the lower housing 14 are formed by stamping and then machined, while the conventional differential housing is designed as a whole and is formed by casting and then machined. Compared with the conventional differential, the differential assembly of this utility model has the advantages of lighter weight, shorter production cycle and smaller production space.

[0026] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A differential assembly, characterized in that, Includes upper housing, lower housing, main reduction gear, pin, pin retaining ring, and transmission components; The main reduction gear is fixedly connected to the lower housing and sleeved on the lower housing. The upper housing is fixedly connected to the lower housing and located on one side of the lower housing. The pin is connected to the upper housing and passes through the upper housing. The pin retaining ring is fixedly connected to the pin and located at one end of the pin. The transmission component is disposed inside the upper housing and the lower housing.

2. The differential assembly as described in claim 1, characterized in that, The upper housing has a through hole that penetrates the upper housing and engages with the pin.

3. The differential assembly as described in claim 1, characterized in that, The transmission component includes a first planetary gear, a second planetary gear, a first half-shaft gear, and a second half-shaft gear. The first planetary gear is connected to the pin and is sleeved on the pin. The second planetary gear is connected to the pin and is sleeved on the pin. The first half-shaft gear is connected to the upper housing and meshes with the first planetary gear and the second planetary gear. The second half-shaft gear is connected to the lower housing and engages with the first planetary gear and the second planetary gear.

4. The differential assembly as described in claim 3, characterized in that, The transmission component further includes a first planetary gear washer, a second planetary gear washer, a first half-shaft gear washer, and a second half-shaft gear washer. The first planetary gear washer is connected to the upper housing and located between the upper housing and the first planetary gear. The second planetary gear washer is connected to the upper housing and located between the second planetary gear and the upper housing. The first half-shaft gear washer is connected to the upper housing and located between the upper housing and the first half-shaft gear. The second half-shaft gear washer is connected to the lower housing and located between the lower housing and the second half-shaft gear.

5. The differential assembly as described in claim 1, characterized in that, The differential assembly also includes an upper bearing retaining ring and a lower bearing retaining ring. The upper bearing retaining ring is fixedly connected to the upper housing and is sleeved on the upper housing. The lower bearing retaining ring is fixedly connected to the lower housing and is sleeved on the lower housing.

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