Speed reducer with high speed bearing non-forced lubrication structure

Abstract

The application discloses a reducer with high-speed bearing non-forced lubrication structure and belongs to the technical field of reducers. The reducer solves the defects that the high-speed bearing in the electric drive bridge reducer is prone to insufficient lubrication and further causes dry grinding of the bearing under the condition that only splash lubrication is adopted and an auxiliary oil pump is not added. The reducer mainly comprises a main reducer shell and a three-shaft gear. An axle bearing mounting hole is arranged on the inner wall of the main reducer shell. The three-shaft gear is mounted in the main reducer shell. The axle bearing mounting hole is communicated with an axle bearing oil inlet hole. An oil receiving cover assembly is fixedly mounted on the inner wall of the main reducer shell. The oil receiving cover assembly is in a curved channel structure. The oil receiving cover assembly is provided with a large port and a small port. The large port is downwardly opened and is arranged along the tangential direction of the three-shaft gear. The small port is communicated with the axle bearing oil inlet hole.

Description

Technical Field

[0001] This invention belongs to the field of speed reducer technology, and more specifically, relates to a speed reducer with a high-speed bearing non-forced lubrication structure. Background Technology

[0002] Currently, electric drive axles in electric vehicles mostly use high-speed motors with advantages such as light weight, high power density, and low cost. At the same time, in order to meet the requirements of compact and lightweight reducer structure, traditional drive axle gear splash lubricating oil is still used to lubricate the high-speed bearings without adding auxiliary lubrication devices. However, insufficient lubrication can easily lead to dry friction of the bearings, which in turn can cause bearing damage and reduce the life of the electric drive axle. Summary of the Invention

[0003] The purpose of this invention is to provide a speed reducer with a non-forced lubrication structure for high-speed bearings, in order to overcome the defect in the prior art where the high-speed bearings in electric drive bridge speed reducers are easily insufficiently lubricated when only splash lubrication is used and no auxiliary oil pump is added, which leads to dry friction of the bearings.

[0004] This invention is achieved using the following technical solution: a reducer with a high-speed bearing non-forced lubrication structure, comprising a main reducer housing and a three-axis gear. The inner wall of the main reducer housing has a first-axis bearing mounting hole. The three-axis gear is installed inside the main reducer housing. The first-axis bearing mounting hole connects to the first-axis bearing oil inlet. An oil receiving cover assembly is fixedly installed on the inner wall of the main reducer housing. The oil receiving cover assembly has a curved channel structure, with a large port and a small port. The large port opens downwards and is arranged tangentially to the three-axis gear. The small port connects to the first-axis bearing oil inlet. This invention, by setting the oil receiving cover assembly between the three-axis gear and the first-axis bearing, allows the lubricating oil in the main reducer housing to splash into the oil receiving cover assembly as the gear rotates, enabling the lubricating oil in the reducer to flow along a specific route. This improves the lubrication environment of the first-axis bearing without adding an auxiliary oil pump.

[0005] Furthermore, the oil receiving cover assembly includes a front side, a rear side, a top surface, and a bottom surface of the oil receiving cover, all fixedly connected to each other. These surfaces are curved and form a channel that is wider at the front and narrower at the back. This invention, by designing the oil receiving cover assembly as a channel that is wider at the front and narrower at the back, allows the lubricating oil to enter the assembly more quickly and also has the advantages of being lightweight and low-cost.

[0006] Furthermore, the front side, rear side, top, and bottom of the oil receiving cover are connected by welding.

[0007] Furthermore, the oil inlet hole of the primary bearing is located on the side wall of the primary bearing mounting hole. By placing the oil inlet hole of the primary bearing on the side wall of the primary bearing mounting hole, this invention facilitates the rapid filling of the oil reservoir within the primary bearing mounting hole with lubricating oil.

[0008] Furthermore, the oil receiving cover assembly is fixed to the main reduction gear housing bolt holes on the main reduction gear housing by bolts. The oil receiving cover assembly of the present invention is securely fixed to the main reduction gear housing by bolts.

[0009] Furthermore, the angle between the line connecting the center of the bearing oil inlet and the bearing mounting hole and the horizontal plane is 5 to 20 degrees. This invention, by setting a certain angle, allows lubricating oil to flow rapidly from the bearing oil inlet into the bearing mounting hole.

[0010] Furthermore, the inner wall of the main reducer housing is provided with two bearing mounting holes, and the primary bearing mounting hole and the secondary bearing mounting hole are connected by an oblique oil passage. The lubricating oil in the primary bearing mounting hole can flow into the secondary bearing mounting hole through the oblique oil passage, thereby lubricating the secondary bearing.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. This invention improves the lubrication environment of the first shaft bearing by setting an oil receiving cover assembly between the three-axis gear and the first shaft bearing, so that the lubricating oil in the reducer splashes into the oil receiving cover assembly as the gear rotates, allowing the lubricating oil in the reducer to flow along a specific route.

[0013] 2. By setting an oblique oil passage, the present invention can guide the lubricating oil in the mounting hole of the first shaft bearing to the mounting hole of the second shaft bearing, thereby improving the lubrication environment of the second shaft bearing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the main reducing housing 100 of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the oil receiving cover assembly 500 described in this invention.

[0018] In the diagram: 100, main reducer housing; 200, first shaft bearing; 300, second shaft bearing; 400, third shaft gear; 500, oil inlet cover assembly; 600, bolt; 101, main reducer housing bolt hole; 102, first shaft bearing mounting hole; 103, second shaft bearing mounting hole; 104, first shaft bearing oil inlet; 105, oblique oil passage hole; 501, large port; 502, small port; 503, front side of oil inlet cover; 504, rear side of oil inlet cover; 505, top of oil inlet cover; 506, bottom of oil inlet cover. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0020] A speed reducer with a high-speed bearing non-forced lubrication structure includes a main reducer housing 100 and a three-axis gear 400. The inner wall of the main reducer housing 100 is provided with a first-axis bearing mounting hole 102. The three-axis gear is installed inside the main reducer housing 100. The first-axis bearing mounting hole 102 is connected to the first-axis bearing oil inlet hole 104. An oil receiving cover assembly 500 is fixedly installed on the inner wall of the main reducer housing 100. The oil receiving cover assembly 500 has a curved channel structure and is provided with a large port 501 and a small port 502. The large port 501 opens downward and is arranged along the tangential direction of the three-axis gear 400. The small port 502 is connected to the first-axis bearing oil inlet hole 104.

[0021] In this invention, the lubricating oil in the main reducer housing 100 is thrown into the oil receiving cover assembly 500 as the gear rotates, allowing the lubricating oil in the reducer to flow along the curved channel within the oil receiving cover assembly 500. This improves the lubrication environment of the primary shaft bearing mounting hole 102 without adding an auxiliary oil pump. The highest point of the curved channel structure is higher than the height of the small port 502. When the three-axis gear 400 rotates at high speed, it quickly throws the lubricating oil in the main reducer housing 100 tangentially towards the large port 501. The primary shaft bearing 200 is installed in the primary shaft bearing mounting hole 102.

[0022] The oil collecting cover assembly 500 includes a front side 503, a rear side 504, a top 505, and a bottom 506 of the oil collecting cover that are fixedly connected to each other. The front side 503, the rear side 504, the top 505, and the bottom 506 of the oil collecting cover are curved surfaces and form a channel that is wider at the front and narrower at the back.

[0023] The present invention designs the oil receiving cover assembly as a channel that is wider at the front and narrower at the back, so that the lubricating oil entering the oil receiving cover assembly flows out of the small port 502 at a faster speed. At the same time, the oil receiving cover assembly 500 also has the advantages of being lightweight and low cost.

[0024] The oil inlet hole 104 of the primary shaft bearing is located on the side wall of the primary shaft bearing mounting hole 102.

[0025] By setting the oil inlet hole of the shaft bearing on the side wall of the shaft bearing mounting hole 102, the present invention can facilitate the rapid filling of the oil storage cavity in the shaft bearing mounting hole 102 with lubricating oil, and also facilitates the connection of the oil receiving cover assembly 500 to the shaft bearing mounting hole 102.

[0026] The oil receiving cover assembly 500 is fixed to the main reduction housing bolt hole 101 on the main reduction housing 100 by bolts 600.

[0027] The angle between the line connecting the center of the bearing oil inlet 104 and the bearing mounting hole 102 and the horizontal plane is 5 degrees to 20 degrees.

[0028] The present invention allows lubricating oil to flow rapidly into the bearing mounting hole 102 through the oil inlet hole 104 of the bearing by setting a certain included angle.

[0029] The inner wall of the main reducer housing 100 is also provided with a two-axis bearing mounting hole 103, and the one-axis bearing mounting hole 102 and the two-axis bearing mounting hole 103 are connected by an oblique oil passage hole 105.

[0030] The lubricating oil in the primary bearing mounting hole 102 of the present invention can flow into the secondary bearing mounting hole 103 through the oblique oil passage 105, thereby achieving lubrication of the secondary bearing 300.

[0031] Working principle of the invention:

[0032] This invention provides an oil receiving cover assembly 500 between a three-axis gear 400 and a primary shaft bearing 200. The large port 501 of the oil receiving cover assembly 500 is higher than the oil level inside the reducer. The large port 501 faces downward and is arranged tangentially to the three-axis gear 400. When the three-axis gear 400 rotates at high speed, it rapidly throws the lubricating oil in the main reducer housing 100 tangentially towards the large port 501. The lubricating oil flows into the large port 501 due to inertia and passes the highest point of the oil passage within the oil receiving cover assembly 500. Under the action of gravity, the lubricating oil rapidly flows towards the small... Port 502, the smaller port 502 is located inside the primary shaft bearing oil inlet hole 104. The highest point of the curved channel structure of the oil receiving cover assembly 500 is higher than the height of the smaller port 502. Simultaneously, the angle between the line connecting the center of the primary shaft bearing oil inlet hole 104 and the primary shaft bearing mounting hole 102 and the horizontal plane is 5 degrees to 20 degrees. This allows lubricating oil to flow rapidly into the primary shaft bearing mounting hole 102 through the primary shaft bearing oil inlet hole 104. Then, the lubricating oil flows from the primary shaft bearing mounting hole 102 through the oblique oil hole 105 and the secondary shaft bearing mounting hole 103 to lubricate the secondary shaft bearing 300. This invention ensures that the primary shaft bearing 200 receives sufficient lubrication only under splash lubrication conditions within the main reducer housing 100, thereby improving the service life of the electric drive bridge.

[0033] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the invention should also be covered within the protection scope of the invention. Therefore, the protection scope of the invention should be determined by the scope of the claims.

Claims

1. A speed reducer with a high-speed bearing non-forced lubrication structure, comprising a main reducer housing (100) and a three-axis gear (400), wherein a bearing mounting hole (102) is provided on the inner wall of the main reducer housing (100), and the three-axis gear is installed inside the main reducer housing (100), characterized in that: The one-axis bearing mounting hole (102) is communicated with an one-axis bearing oil inlet hole (104), an oil receiving cover assembly (500) is fixedly installed on the inner wall of the main reduction shell (100), the oil receiving cover assembly (500) is a curved channel structure, the oil receiving cover assembly (500) is provided with a large port (501) and a small port (502), the large port (501) is downwardly opened and arranged along the tangential direction of the three-axis gear (400), and the small port (502) is communicated with the one-axis bearing oil inlet hole (104). The oil receiving cover assembly (500) comprises an oil receiving cover front side (503), an oil receiving cover rear side (504), an oil receiving cover upper surface (505) and an oil receiving cover lower surface (506) which are fixedly connected with each other, the oil receiving cover front side (503), the oil receiving cover rear side (504), the oil receiving cover upper surface (505) and the oil receiving cover lower surface (506) are curved surfaces and form a channel which is wide in front and narrow in rear. The inner wall of the main reduction shell (100) is further provided with a two-axis bearing mounting hole (103), and the one-axis bearing mounting hole (102) and the two-axis bearing mounting hole (103) are communicated through an inclined oil hole (105).

2. The speed reducer having a high-speed bearing non-forced lubrication structure according to claim 1, characterized by: The oil receiving cover front side (503), the oil receiving cover rear side (504), the oil receiving cover upper surface (505) and the oil receiving cover lower surface (506) are connected with each other through welding.

3. The speed reducer having a high-speed bearing non-forced lubrication structure according to claim 1, characterized by: The one-axis bearing oil inlet hole (104) is arranged on the side wall of the one-axis bearing mounting hole (102).

4. The speed reducer having a high-speed bearing non-forced lubrication structure according to claim 1, characterized by: The oil receiving cover assembly (500) is fixed on the main reduction shell bolt hole (101) of the main reduction shell (100) through bolts (600).

5. The speed reducer having a high-speed bearing non-forced lubrication structure according to claim 1, characterized by: The included angle between the center line of the one-axis bearing oil inlet hole (104) and the one-axis bearing mounting hole (102) and the horizontal plane is 5-20 degrees.

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