Differential transmission device
By adopting a differential transmission device with flat gaskets and planar structures, the assembly gap fluctuation problem caused by ball gasket deformation is solved, and the effect of simplifying mold manufacturing, reducing costs and improving production efficiency is achieved.
Patent Information
- Application Number
- CN202422264347.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The processing deformation of ball gaskets in existing open differentials leads to large fluctuations in the assembly gap range, complex assembly line structure and low efficiency.
The flat gasket design is adopted, including ring sheet structure, ladder-shaped rib strips and radial oil storage holes, combined with the planar structure half-axle gear and planetary gear, reducing mold manufacturing costs and processing difficulties, and improving dimensional accuracy and production efficiency.
The mold manufacturing and processing process is simplified, the development cycle and cost are reduced, the gasket specifications and types are reduced, and the assembly efficiency and product unit price are improved.
Smart Images
Figure CN223120541U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of open differentials, and specifically relates to a differential transmission device. Background Technique
[0002] At present, most of the differentials in vehicle gearboxes or drive axles are open differentials. Open differentials are widely used due to their advantages such as simple structure and low manufacturing cost. The differential mainly consists of a differential housing, two half-shaft gears, two planetary gears, a planetary shaft, gaskets and other parts.
[0003] As shown in the attached Figure 2 In this transmission structure, the back of the planetary gear is a spherical structure, and the matching gasket and differential housing parts are both made into spherical structures. The back of the half-shaft gear is a flat structure, and the matching gasket and differential housing parts are both made into flat structures. The position of the tooth surface contact spot and the gear clearance are adjusted by flat gaskets of different thickness specifications to meet the technical requirements. The main problem of this method is that the spherical surface of the spherical gasket is guaranteed by a mold. During the processing of the spherical gasket, there will be elastic springback deformation. Coupled with the subsequent heat treatment, the spherical surface deformation will be more serious, and there is a large scatter in the deformation amount. As a result, even when using parts of the same batch, when assembling the differential assembly, the gap range fluctuates greatly. Therefore, flat gaskets of various thickness specifications are required to adjust the gap, and the further consequence is that the assembly line structure is complex and the assembly efficiency is low.
[0004] Therefore, in view of this, in view of the existing structural deficiencies, research and improvement are carried out, and a differential transmission device is proposed. Content of the Utility Model
[0005] The purpose of the utility model is to provide a differential transmission device to solve the problems raised in the above background technique.
[0006] To achieve the above purpose, the utility model provides the following technical solution: A differential transmission device includes a gasket body. The gasket body includes a flat gasket, a through hole, a rib and an oil storage hole. The flat gasket is in a circular ring shape, and a through hole is provided through the middle of the flat gasket. Ribs are arranged on the surface of the flat gasket, and oil storage holes are distributed between adjacent ribs.
[0007] Further, the oil storage hole is recessed on the surface of the flat gasket, and the oil storage holes between adjacent ribs are in a radial dot matrix structure.
[0008] Further, the rib is in a trapezoidal shape, and the wide side of the rib faces the center direction of the flat gasket, and the narrow side of the rib faces the outer side direction of the flat gasket.
[0009] Further, the gasket body is arranged on the side wall of the differential housing, and the differential housing is integrally fixed with the ring gear.
[0010] Further, half shaft gears are rotatably installed at both ends of the differential case, and the half shaft gears at both ends are coaxially connected to the corresponding drive half shafts.
[0011] Further, a planetary shaft is arranged in the middle of the differential case, and planetary gears meshing with the ring gear are arranged at both ends of the planetary shaft.
[0012] Further, the corresponding parts of the half shaft gears and the planetary gears in contact with the differential case are plane structures adapted to flat gaskets.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] 1. When the utility model is in use, in this application, the spherical gasket originally adapted to the planetary gear is changed to a flat gasket, and further, the corresponding parts of the half shaft gears and the planetary gears in contact with the differential case are adjusted to plane structures adapted to flat gaskets. The advantages of such a design are as follows: First, because flat gaskets do not require mold manufacturing during product proofing, only laser cutting of sheet metal is needed to achieve it, which greatly reduces the development cycle and mold manufacturing costs, and the cost increase caused by design changes is also extremely small. After mass production, because the flat gasket mold is simple to manufacture and has a much longer service life than the spherical gasket, it will also bring about a reduction in the unit price of the product; Second, correspondingly, the parts of the planetary gear and the differential case that match the gasket are changed from the original spherical surface to a plane structure, which is easy to process, measure, and control; Finally, due to the adoption of the flat gasket structure for the planetary gear gasket, the dimensional accuracy is easy to control, the specifications of the adjusting gaskets for the half shaft gears are reduced, generally from the original 5 - 6 specifications to 1 - 2 specifications, greatly reducing the time for selecting gaskets during assembly and improving production efficiency.
[0015] 2. When the utility model is in use, in this application, the flat gasket is in the shape of a circular ring sheet and has ribs on its surface. "Concave" oil storage holes in a radial dot matrix structure are arranged between adjacent ribs to better store the oil around the differential gasket. By setting the ribs to a trapezoidal structure with the wide side facing inward and the narrow side facing outward, when the differential gasket is under pressure and deforms, the oil will be extruded from the inside to the outside and will not gather towards the axis position, thereby reducing the internal pressure of the differential. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural diagram of the open differential of the utility model;
[0017] Figure 2 is a schematic structural diagram of the open differential of the prior art;
[0018] Figure 3 is a schematic structural diagram of the gasket body of the utility model.
[0019] In the figure: 1. Gasket body; 101. Flat gasket; 102. Through hole; 103. Rib; 104. Oil storage hole; 2. Differential housing; 3. Ring gear; 4. Side gear; 5. Drive half shaft; 6. Planet shaft; 7. Planet gear. Specific embodiments
[0020] The following further describes in detail the embodiments of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.
[0021] As Figures 1 to 3 shown, a differential transmission device includes a gasket body 1. The gasket body 1 includes a flat gasket 101, a through hole 102, a rib 103 and an oil storage hole 104. The flat gasket 101 is in the shape of a circular ring sheet, and a through hole 102 is provided through the middle of the flat gasket 101. Ribs 103 are arranged on the surface of the flat gasket 101, and oil storage holes 104 are distributed between adjacent ribs 103. The oil storage holes 104 are recessed on the surface of the flat gasket 101, and the oil storage holes 104 between adjacent ribs 103 are in a radial dot matrix structure. The ribs 103 are in the shape of a trapezoid, and the wide side of the rib 103 faces the center direction of the flat gasket 101, and the narrow side of the rib 103 faces the outer side of the flat gasket 101. In this application, the flat gasket 101 is in the shape of a circular ring sheet and ribs 103 are arranged on its surface. "Concave" oil storage holes 104 in a radial dot matrix structure are arranged between adjacent ribs 103 to better store the oil around the differential gasket. By setting the ribs 103 as a trapezoidal structure with the wide side facing inwards and the narrow side facing outwards, when the differential gasket is deformed under pressure, the oil will be squeezed from the inside to the outside, rather than gathering towards the axis position, thereby reducing the internal pressure of the differential;
[0022] As Figures 1 to 2 shown, the gasket body 1 is arranged on the side wall of the differential housing 2, and the differential housing 2 is integrally fixed with the ring gear 3. Side gears 4 are rotatably installed at both ends of the differential housing 2, and the two side gears 4 at both ends are coaxially connected to the corresponding drive half shafts 5. A planet shaft 6 is arranged in the middle of the differential housing 2, and planet gears 7 meshing with the ring gear 3 are provided at both ends of the planet shaft 6. The corresponding parts of the side gears 4 and the planet gears 7 in contact with the differential housing 2 are plane structures adapted to the flat gasket 101. In this application, the spherical gasket originally adapted to the planet gear 7 is changed to a flat gasket 101, and the corresponding parts of the side gears 4 and the planet gears 7 in contact with the differential housing 2 are further adjusted to plane structures adapted to the flat gasket 101.
[0023] Working principle: When using this differential drive device, the flat gasket 101 of the present application is in the shape of a circular sheet and has ribs 103 on its surface. "Concave" oil storage holes 104 in a radial dot matrix structure are arranged between adjacent ribs 103 to better store the oil around the differential gasket. By setting the ribs 103 to a trapezoidal structure with the wide side facing inward and the narrow side facing outward, when the differential gasket is deformed under pressure, the oil will be extruded from the inside to the outside instead of gathering towards the axis position, thereby reducing the internal pressure of the differential. The present application changes the ball gasket originally adapted to the planetary gear 7 to a flat gasket 101, and further adjusts the corresponding parts of the half-axis gear 4 and the planetary gear 7 in contact with the differential case 2 to a flat structure adapted to the flat gasket 101. The advantages of such a design are as follows: First, since the flat gasket 101 does not require a mold during the product proofing period and can be realized only by laser cutting the sheet material, it greatly reduces the development cycle and the mold manufacturing cost, and the cost increase caused by design changes is also extremely small. After mass production, because the flat gasket 101 has a simple mold manufacturing and a much longer service life than the ball gasket, it will also bring a reduction in the unit price of the product. Second, correspondingly, the parts of the planetary gear 7 and the differential case 2 that match the gasket are changed from the original spherical surface to a flat structure, which is easy to process, measure, and control. Finally, due to the use of the flat gasket 101 structure for the planetary gear 7 gasket, the dimensional accuracy is easy to control, the number of adjustment gasket specifications for the half-axis gear 4 is reduced, generally from the original 5 - 6 specifications to 1 - 2 specifications, greatly reducing the time for selecting gaskets during assembly and improving the production efficiency.
[0024] The embodiments of the present invention are given for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for specific purposes.
Claims
1. A differential drive device, comprising a gasket body (1), characterized in that, The gasket body (1) includes a flat gasket (101), a through hole (102), rib strips (103), and oil storage holes (104). The flat gasket (101) is in the shape of a circular ring sheet, and a through hole (102) is provided through the middle of the flat gasket (101). Rib strips (103) are arranged on the surface of the flat gasket (101), and oil storage holes (104) are distributed between adjacent rib strips (103).
2. The differential drive device according to claim 1, characterized in that, The oil storage holes (104) are recessed on the surface of the flat gasket (101), and the oil storage holes (104) between adjacent rib strips (103) are in a radial dot matrix structure.
3. A differential transmission device according to claim 2, characterized in that, The rib strips (103) are in the shape of a frustum of a pyramid, and the wider side of the rib strip (103) faces the center direction of the flat gasket (101), and the narrower side of the rib strip (103) faces the outer side direction of the flat gasket (101).
4. A differential drive device according to claim 3, characterized in that, The gasket body (1) is arranged on the side wall of the differential case (2), and the differential case (2) is integrally fixed with the ring gear (3).
5. A differential drive device according to claim 4, characterized in that, Half shaft gears (4) are rotatably installed at both ends of the differential case (2), and the half shaft gears (4) at both ends are coaxially connected with the corresponding drive half shafts (5).
6. A differential drive device according to claim 5, characterized in that, A planetary shaft (6) is arranged in the middle of the differential case (2), and planetary gears (7) meshing with the ring gear (3) are provided at both ends of the planetary shaft (6).
7. A differential drive device according to claim 6, wherein, The corresponding parts of the half shaft gears (4) and the planetary gears (7) in contact with the differential case (2) are flat structures adapted to the flat gasket (101).