Speed reducer assembly capable of being naturally lubricated
By adopting an integrated cast oil baffle and wall oil passage design in the reducer assembly, the problems of complex structure and large oil churning loss in the existing technology are solved, a simpler lubrication method is achieved, costs are reduced and the efficiency of the transmission system is improved.
Patent Information
- Application Number
- CN202520530747.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-25
AI Technical Summary
Existing reducer assemblies suffer from complex structures, high costs, and significant oil churning losses during lubrication, especially under high-speed rotation conditions, leading to reduced transmission system efficiency.
The design incorporates an integrally cast oil baffle and wall oil passages, achieving natural lubrication through symmetrical lubrication paths. This reduces the amount of oil injected into the oil chamber and the number of parts. The oil baffle guides the oil splashed from the gears into the differential.
The structure of the reducer assembly has been simplified, reducing costs and oil churning losses, achieving full lubrication of all components, and improving the efficiency of the transmission system.
Smart Images
Figure CN223768077U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gearbox lubrication technology, specifically to a reducer assembly that can be naturally lubricated. Background Technology
[0002] As a key component of automotive transmission, the reducer assembly enables speed reduction and torque increase. During transmission, heat generated by components such as gears, bearings, and differentials can lead to malfunctions in the vehicle's transmission and steering functions. The industry commonly addresses this by increasing the oil volume and utilizing integrated oil cooling systems such as oil pumps and oil coolers to deliver oil to designated areas for forced lubrication. However, increasing the oil volume leads to greater power loss due to oil churning in the gears under high-speed rotation conditions; forced lubrication results in increased structural complexity, a larger number of components, and higher costs. Summary of the Invention
[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a naturally lubricated reducer assembly. This reducer assembly can achieve adequate lubrication of its components with a simpler structure.
[0004] The purpose of this utility model is achieved by the following solution: a naturally lubricated reducer assembly, including a reducer housing, an oil seal at the left end of the reducer housing, and a reducer housing end cover at the right end of the reducer housing. A reducer is located at the upper end of the reducer housing, and a differential is located at the lower end of the reducer housing. The reducer includes an input shaft and an intermediate shaft. The input shaft is located at the upper end of the reducer, with a left input shaft bearing and a right input shaft bearing at its left and right ends respectively. An input shaft gear assembly is located in the middle section of the input shaft. The intermediate shaft is located at the lower end of the reducer, with a left intermediate shaft bearing and a right intermediate shaft bearing at its left and right ends respectively. An intermediate shaft gear assembly is located in the middle section of the intermediate shaft. The left ends of the input shaft gear assembly and the intermediate shaft gear assembly mesh with each other for power transmission. The differential includes a differential assembly, with differential bearings located at its left and right ends respectively. The differential assembly includes a left and right differential bearing. A differential shaft gear is located in the middle section of the differential assembly. The differential shaft gear meshes with the right end of the intermediate shaft gear assembly to transmit power. A left oil baffle is located on the upper end of the left differential bearing housing of the left differential bearing, and a right oil baffle is located on the upper end of the right differential bearing housing of the right differential bearing. Lubrication oil passages are provided on both the front and rear end faces of the left and right oil baffles. Lubricating oil is introduced into the differential bearing and the differential through the oil passage openings of the lubrication oil passages, respectively. An upper oil baffle is located on the reducer housing between the upper part of the differential assembly opening and the left side of the differential shaft gear. A wall oil passage is provided on the upper end of the intermediate shaft left bearing housing of the intermediate shaft left bearing. The upper end of the wall oil passage is connected and fixed to the oil baffle. Lubrication oil passages are provided on both the front and rear end faces of the oil baffle. Oil is lubricated to the intermediate shaft left bearing through the lubrication oil passages on the oil baffle.
[0005] The left oil baffle and the left differential bearing housing are integrally cast, and the right oil baffle and the right differential bearing housing are integrally cast.
[0006] The reducer housing is fixed to the left differential bearing seat and the right differential bearing seat by bolts.
[0007] The lubrication oil paths on the front and rear ends of the left and right oil baffles are arranged symmetrically.
[0008] The upper oil baffle is connected and fixed to the reducer housing by bolts, and the bottom surface of the lower end of the upper oil baffle is inclined.
[0009] The wall oil passage, the intermediate shaft left bearing seat, and the reducer housing are integrally cast.
[0010] The lubrication oil passages on the front and rear end faces of the oil baffle are arranged symmetrically.
[0011] The oil baffle is an arc-shaped oil baffle.
[0012] The upper ends of the intermediate shaft right bearing seat, the input shaft right bearing seat, and the input shaft left bearing seat are all provided with wall oil passages and oil baffles.
[0013] The advantage of this invention lies in reducing structural complexity by casting the oil groove and various oil baffles as a single, integrated component. An oil baffle designed above the differential efficiently guides the oil splashed from gear churning back into the differential. This overall design reduces the amount of oil injected into the oil chamber and the number of components, lowering costs and reducing churning losses in the transmission system. It achieves adequate lubrication of all components in the reducer assembly with a simpler structure. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is an exploded view of the present invention;
[0016] Figure 3 This is a schematic diagram of the front structure of the left oil baffle.
[0017] Figure 4 This is a schematic diagram of the reverse side structure of the left oil baffle.
[0018] Figure 5 This is a schematic diagram of the upper oil baffle structure;
[0019] Figure 6 This is a schematic diagram of the structure of the oil baffle and the left bearing seat of the intermediate shaft;
[0020] Figure 7 This is a schematic diagram of the oil baffle structure. Detailed Implementation
[0021] like Figures 1 to 7As shown, a naturally lubricated reducer assembly includes a reducer housing 2, an oil seal 1 at the left end of the reducer housing 2, and a reducer housing end cover 6 at the right end of the reducer housing 2. A reducer is located at the upper end of the reducer housing 2, and a differential is located at the lower end of the reducer housing 2. The reducer includes an input shaft and an intermediate shaft. The input shaft is located at the upper end of the reducer, with a left input shaft bearing 3 and a right input shaft bearing 5 at its left and right ends, respectively. An input shaft gear assembly 4 is located in the middle section of the input shaft. The intermediate shaft is located at the lower end of the reducer, with a left intermediate shaft bearing 7 and a right intermediate shaft bearing 9 at its left and right ends, respectively. An intermediate shaft gear assembly 8 is located in the middle section of the intermediate shaft. The left ends of the input shaft gear assembly 4 and the intermediate shaft gear assembly 8 mesh with each other to transmit power. The differential includes... The differential assembly 11 has a left differential bearing 10 and a right differential bearing 13 at its left and right ends, respectively. A differential shaft gear 12 is located in the middle section of the differential assembly 11. The differential shaft gear 12 meshes with the right end of the intermediate shaft gear assembly 8 for power transmission. A left oil baffle 18 is located on the upper end of the left differential bearing housing 15 of the left differential bearing 10, and a right oil baffle 20 is located on the upper end of the right differential bearing housing 14 of the right differential bearing 13. Lubrication oil passages are provided on both the front and rear end faces of the left and right oil baffles 18 and 20. Lubricating oil is introduced into the differential bearings and the differential through the oil passage openings. The left oil baffle 18 and the left differential bearing housing 15 are integrally cast, and the right oil baffle 20 and the right differential bearing housing 14 are integrally cast. The reducer housing 2 is bolted to the left and right differential bearing housings 15 and 14. The lubrication paths on the front and rear end faces of the left and right oil baffles 18 and 20 are symmetrically arranged to ensure sufficient lubrication in both forward and reverse rotation. An upper oil baffle 19 is installed on the reducer housing 2 between the upper opening of the differential assembly 11 and the left side of the differential shaft gear 12. The upper oil baffle 19 is bolted to the reducer housing 2, and its lower bottom surface is inclined to efficiently direct splashed oil from the rotation of the differential shaft gear 12 into the differential. A wall oil passage 22 is provided at the upper end of the intermediate shaft left bearing seat 23 of the intermediate shaft left bearing 7. The upper end of the wall oil passage 22 is connected to the oil baffle 21. Lubrication paths are provided on both the front and rear end faces of the oil baffle 21, allowing oil to lubricate the intermediate shaft left bearing 7 via these paths. The wall oil passage 22, the intermediate shaft left bearing seat 23, and the reducer housing 2 are integrally cast. The lubrication paths on the front and rear end faces of the oil baffle 21 are arranged symmetrically to ensure sufficient lubrication in both forward and reverse rotation. The oil baffle 21 is an arc-shaped oil baffle, and its shape is set according to the components inside the reducer.The upper ends of the intermediate shaft right bearing seat, the input shaft right bearing seat, and the input shaft left bearing seat are all provided with wall oil passages 22 and oil baffles 21 to ensure that all parts in the reducer can be fully lubricated.
[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications made to the present utility model by those skilled in the art without departing from the spirit of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A natural lubrication reducer assembly, comprising a reducer housing (2), an oil seal (1) is arranged at the left end of the reducer housing (2), a reducer housing end cover (6) is arranged at the right end of the reducer housing (2), a reducer is arranged in the upper end of the reducer housing (2), a differential is arranged at the lower end of the reducer housing (2), the reducer comprises an input shaft and an intermediate shaft, the input shaft is arranged at the upper end of the reducer, the left and right ends of the input shaft are respectively provided with an input shaft left bearing (3) and an input shaft right bearing (5), the middle section of the input shaft is provided with an input shaft gear assembly (4), the intermediate shaft is arranged at the lower end of the reducer, the left and right ends of the intermediate shaft are respectively provided with an intermediate shaft left bearing (7) and an intermediate shaft right bearing (9), the middle section of the intermediate shaft is provided with an intermediate shaft gear assembly (8), the left ends of the input shaft gear assembly (4) and the intermediate shaft gear assembly (8) are meshed with each other to transmit power, the differential comprises a differential assembly (11), the left and right ends of the differential assembly (11) are respectively provided with a differential left bearing (10) and a differential right bearing (13), the middle section of the differential assembly (11) is provided with a differential shaft gear (12), the differential shaft gear (12) and the right end of the intermediate shaft gear assembly (8) are meshed with each other to transmit power, characterized in that: The differential left bearing (10) is provided with a left oil baffle (18) on the upper end of the differential left bearing seat (15), and the differential right bearing (13) is provided with a right oil baffle (20) on the upper end of the differential right bearing seat (14), the left oil baffle (18) and the right oil baffle (20) are provided with lubricating oil paths on the front and rear end faces, and the lubricating oil is introduced into the differential bearing and the differential through the oil channel openings of the lubricating oil paths, the reducer housing (2) is provided with an upper oil baffle (19) between the opening of the differential assembly (11) and the left side of the differential shaft gear (12), the upper end of the intermediate shaft left bearing seat (23) of the intermediate shaft left bearing (7) is provided with a wall oil channel (22), the upper end of the wall oil channel (22) is connected and fixed with the oil baffle (21), the oil baffle (21) is provided with lubricating oil paths on the front and rear end faces, and the oil baffle (21) is lubricated by the lubricating oil paths.
2. The naturally lubricatable reducer assembly of claim 1, wherein: The left oil baffle (18) and the differential left bearing seat (15) are integrally cast, and the right oil baffle (20) and the differential right bearing seat (14) are integrally cast.
3. The naturally lubricatable reducer assembly of claim 1, wherein: The reducer housing (2), the differential left bearing seat (15) and the differential right bearing seat (14) are connected and fixed by bolts.
4. The naturally lubricatable reducer assembly of claim 1, wherein: The lubricating oil paths on the front and rear end faces of the left oil baffle (18) and the right oil baffle (20) are symmetrically arranged.
5. The naturally lubricatable reducer assembly of claim 1, wherein: The upper oil baffle (19) is connected and fixed with the reducer housing (2) by bolts, and the lower end face of the upper oil baffle (19) is inclined.
6. The naturally lubricatable reducer assembly of claim 1, wherein: The wall oil channel (22), the intermediate shaft left bearing seat (23) and the reducer housing (2) are integrally cast.
7. The naturally lubricatable reducer assembly of claim 1, wherein: The lubricating oil paths on the front and rear end faces of the oil baffle (21) are symmetrically arranged.
8. The naturally lubricatable reducer assembly of claim 1, wherein: The oil baffle (21) is a circular arc oil baffle.
9. The naturally lubricatable reducer assembly of claim 1, wherein: The intermediate shaft right bearing seat, the input shaft right bearing seat and the input shaft left bearing seat are provided with wall oil channels (22) and oil baffles (21) on the upper ends.