An electric drive axle assembly differential site lubrication system

Abstract

The utility model provides a kind of electric drive bridge assembly differential part fixed point lubrication system, it realizes the case of less oiling amount, guarantee the lubrication demand of differential bearing and differential gear set, to improve the bearing and gear life corresponding to differential, it includes gearbox main casing, differential, main gearbox cavity is arranged in the gearbox main casing, differential cavity, the two sides half axle of the differential is placed in the differential cavity of gearbox main casing by the bearing seat of two sides, bearing, the bearing seat of two sides is left bearing seat, right bearing seat, the bearing of two sides is left bearing, right bearing, it is characterized in that, it further includes: oil pump;Shell oil circuit;Left oil pipe;Right oil pipe;And transverse oil pipe;The oil pump is placed in the bottom or one side bottom of the gearbox main casing corresponding to main gearbox cavity, and the oil inlet of the oil pump is directly or indirectly communicated with the bottom of main gearbox cavity.

Description

Technical Field

[0001] This utility model relates to the technical field of electric drive axle lubrication, specifically a fixed-point lubrication system for the differential of an electric drive axle assembly. Background Technology

[0002] The electric drive axle is an electromechanical integrated drive system designed for electric vehicles, featuring advantages such as high integration, small size, and low energy consumption. As a core component of electric vehicles, its performance directly affects the power and economy of the vehicle.

[0003] The electric drive axle mainly consists of a motor, inverter, and gearbox. In some electric drive axles, the differential is directly integrated into the gearbox. In order to reduce oil churning losses, the amount of oil added to the gearbox of the electric drive axle is decreasing. With a small amount of oil added, it is difficult to meet the lubrication requirements of the bearings and gear meshing of the differential by relying solely on gear splashing. Therefore, there is an urgent need to develop a lubrication system for the differential that can perform active lubrication. Utility Model Content

[0004] To address the aforementioned issues, this invention provides a point-to-point lubrication system for the differential of an electric drive axle assembly. This system ensures the lubrication needs of the differential bearings and differential gear sets with a smaller amount of lubricant, thereby extending the lifespan of the corresponding bearings and gears.

[0005] A fixed-point lubrication system for the differential section of an electric drive axle assembly, comprising a gearbox main housing and a differential, wherein a main transmission chamber and a differential chamber are disposed within the gearbox main housing, and the two half-shafts of the differential are respectively placed in the differential chamber of the gearbox main housing via bearing seats and bearings on both sides, wherein the bearing seats on both sides are left bearing seats and right bearing seats, and the bearings on both sides are left bearings and right bearings, characterized in that it further comprises: Oil pump; Oil passages in the casing; Left oil pipe; Right oil pipe; And horizontally placed oil pipes; The oil pump is located at the bottom or one side of the main housing of the gearbox, corresponding to the bottom of the main transmission chamber. The oil inlet of the oil pump is directly or indirectly connected to the bottom of the main transmission chamber, and the oil outlet of the oil pump is connected to the inlet of the housing oil passage. The housing oil passage includes a first conductive oil passage located in the differential chamber. The end of the first conductive oil passage is located on one side of the left bearing housing. A left oil pipe is connected to the end of the first conductive oil passage. The output end of the left oil pipe is connected to the first support hole of the left bearing housing. The oil sprayed from the output end of the left oil pipe lubricates the left bearing of the differential and the left side of the differential gear set. The first conductive oil passage also connects the oil to one side of the right bearing housing through a transverse oil pipe. The right side of the transverse oil pipe is connected to the right oil pipe. The output end of the right oil pipe is connected to the second support hole of the right bearing housing. The oil sprayed from the output end of the right oil pipe lubricates the right bearing of the differential and the right side of the differential gear set.

[0006] Its further features are: The left and right positions of the first conductive oil circuit can be interchanged without affecting its use; the specific settings can be adjusted according to the actual situation. The transverse oil pipe spans the lateral sides of the differential cavity and is located within the corresponding housing; One end of the left and right oil pipes is installed in the corresponding holes of the gearbox main housing, and the other end of the left and right oil pipes is installed in the corresponding support holes of the corresponding bearing seats, which eliminates the need for bolts and anti-rotation structures when installing the left and right oil pipes; The oil pump is located at the bottom right side of one side plate of the main housing of the gearbox. The housing oil passage includes a right-side inlet oil passage, a right-side inner wall extension oil passage extending backward in the length direction, a transverse oil passage spanning the left and right sides, a connecting oil passage connected to the left side of the top shaft of the main transmission area, and a first conductive oil passage. The oil pumped by the oil pump is distributed to the main transmission cavity and the differential cavity through the housing oil passage.

[0007] By adopting the above technical solution, the oil circuit is arranged through a combination of housing oil circuit and oil pipe. The oil is guided to the bearing housing side away from the oil pump by the horizontal oil pipe, and the left and right oil pipes guide the oil to the bearings and differentials on the corresponding sides, realizing fixed-point oil injection and more direct and effective lubrication. It can ensure the lubrication needs of differential bearings and differential gear sets with less oil, thereby improving the service life of the corresponding bearings and gears of the differential. Attached Figure Description

[0008] Figure 1 This is a three-dimensional structural diagram of the present invention. Figure 1 (No differential chamber); Figure 2 This is a partial sectional perspective view of the present invention (without differential cavity); Figure 3 This is a top view structural diagram of the present invention (exposing the oil pipes and oil passages). Figure 4 This is a schematic diagram of the three-dimensional mechanism of the present invention. Figure 2 (Remove all casings); The names corresponding to the serial numbers in the diagram are as follows: The gearbox main housing 10, differential 20, half shaft 21, differential gear set 22, left bearing housing 30, first support hole 31, right bearing housing 40, second support hole 41, left bearing 50, right bearing 60, oil pump 70, housing oil passage 80, first conducting oil passage 81, right side housing inlet oil passage 82, right side inner wall extension oil passage 83, transverse oil passage 84, connecting oil passage 85, left oil pipe 90, right oil pipe 100, and transverse oil pipe 110. Detailed Implementation

[0009] A fixed-point lubrication system for the differential of an electric drive axle assembly, see Figures 1-4 It includes a gearbox main housing 10 and a differential 20. The gearbox main housing 10 is provided with a main transmission cavity and a differential cavity. The two half-shafts 21 of the differential 20 are placed in the differential cavity of the gearbox main housing 10 through bearing seats and bearings on both sides, respectively. The bearing seats on both sides are left bearing seat 30 and right bearing seat 40, and the bearings on both sides are left bearing 50 and right bearing 60. It also includes an oil pump 70, a housing oil passage 80, a left oil pipe 90, a right oil pipe 100, and a horizontally placed oil pipe 110; The oil pump 70 is located at the bottom or one side of the transmission main housing 10, corresponding to the bottom of the main transmission chamber. The oil inlet of the oil pump 70 is directly or indirectly connected to the bottom of the main transmission chamber, drawing oil from the bottom into the oil pump 70. The oil outlet of the oil pump 70 is connected to the inlet of the housing oil passage 80. The housing oil passage 80 includes a first conducting oil passage 81 located in the differential chamber. The end of the first conducting oil passage 81 is located on one side of the left bearing housing 30. The left oil pipe 90 is connected to the end of the first conducting oil passage 81, and the output end of the left oil pipe 90 is connected to the left shaft. The first support hole 31 of the bearing seat 30, the oil sprayed from the output end of the left oil pipe 90 lubricates the left bearing 50 of the differential and the left side of the differential gear set 22. The first conductive oil passage 81 also connects the oil to one side of the right bearing seat 40 through the horizontal oil pipe 110. The right side of the horizontal oil pipe 110 is connected to the right oil pipe 100. The output end of the right oil pipe 100 is connected to the second support hole 41 of the right bearing seat 40. The oil sprayed from the output end of the right oil pipe 100 lubricates the right bearing 60 of the differential and the right side of the differential gear set 22.

[0010] In a specific embodiment, the transverse oil pipe 110 spans the lateral sides of the differential cavity and is embedded within the corresponding housing, that is, the transverse oil pipe 110 is installed inside the main housing 10 of the gearbox, and both ends of the transverse oil pipe 110 are supported within the holes of the main housing 10 of the gearbox; One end of the left oil pipe 90 and the right oil pipe 100 are installed in the corresponding hole positions of the gearbox main housing 10, and the other end of the left oil pipe 90 and the right oil pipe 100 are installed in the corresponding support hole positions of the corresponding bearing seats, which makes the installation of the left oil pipe 90 and the right oil pipe 100 without bolts and anti-rotation structure.

[0011] In a specific embodiment, the oil pump 70 is located at the bottom of the right side plate of the main housing 10 of the gearbox. The housing oil passage 80 includes a right side inlet oil passage 82, a right side inner wall extension oil passage 83 extending backward in the length direction, a transverse oil passage 84 spanning the left and right sides, a connecting oil passage 85 connected to the left side of the top shaft of the main transmission area, and a first conductive oil passage 81, which covers the main transmission cavity and the differential cavity with the oil pumped by the oil pump 70 through the housing oil passage 80.

[0012] Its working principle is as follows: The oil circuit is arranged through a combination of housing oil circuit and oil pipe. The oil is guided to the bearing housing side away from the oil pump through the horizontal oil pipe. The left oil pipe and the right oil pipe guide the oil to the bearing and differential near the corresponding side, realizing fixed-point oil injection, which makes lubrication more direct and effective. The left oil pipe and the right oil pipe do not require bolts or anti-rotation structure. The two sets of oil pipes are installed in the main housing hole and the bearing housing hole. Since they are set on different shafts, they will not rotate, which makes the arrangement reasonable and convenient, and the oil injection is sufficient and effective.

[0013] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0014] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fixed-point lubrication system for the differential section of an electric drive axle assembly, comprising a gearbox main housing and a differential, wherein a main transmission chamber and a differential chamber are disposed within the gearbox main housing, and the two half-shafts of the differential are respectively placed in the differential chamber of the gearbox main housing via bearing seats and bearings on both sides, wherein the bearing seats on both sides are left bearing seats and right bearing seats, and the bearings on both sides are left bearings and right bearings, characterized in that, It also includes: Oil pump; Oil passages in the casing; Left oil pipe; Right oil pipe; And horizontally placed oil pipes; The oil pump is located at the bottom or one side of the main housing of the gearbox, corresponding to the bottom of the main transmission chamber. The oil inlet of the oil pump is directly or indirectly connected to the bottom of the main transmission chamber, and the oil outlet of the oil pump is connected to the inlet of the housing oil passage. The housing oil passage includes a first conductive oil passage located in the differential chamber. The end of the first conductive oil passage is located on one side of the left bearing housing. A left oil pipe is connected to the end of the first conductive oil passage. The output end of the left oil pipe is connected to the first support hole of the left bearing housing. The oil sprayed from the output end of the left oil pipe lubricates the left bearing of the differential and the left side of the differential gear set. The first conductive oil passage also connects the oil to one side of the right bearing housing through a transverse oil pipe. The right side of the transverse oil pipe is connected to the right oil pipe. The output end of the right oil pipe is connected to the second support hole of the right bearing housing. The oil sprayed from the output end of the right oil pipe lubricates the right bearing of the differential and the right side of the differential gear set.

2. The fixed-point lubrication system for the differential of an electric drive axle assembly according to claim 1, characterized in that: The left and right positions of the first conductive oil circuit can be interchanged.

3. A fixed-point lubrication system for the differential section of an electric drive axle assembly according to claim 1 or 2, characterized in that: The transverse oil pipe spans the lateral sides of the differential cavity and is located within the corresponding housing.

4. A fixed-point lubrication system for the differential of an electric drive axle assembly according to claim 3, characterized in that: One end of the left oil pipe and the right oil pipe are installed in the corresponding hole positions of the main housing of the gearbox, and the other end of the left oil pipe and the right oil pipe are installed in the corresponding support hole positions of the corresponding bearing seats.

5. A fixed-point lubrication system for the differential section of an electric drive axle assembly according to claim 1, characterized in that: The oil pump is located at the bottom right side of one side plate of the main housing of the gearbox. The housing oil passage includes a right-side inlet oil passage, a right-side inner wall extension oil passage extending backward in the length direction, a transverse oil passage spanning the left and right sides, a connecting oil passage connected to the left side of the top shaft of the main transmission area, and a first conductive oil passage. The oil pumped by the oil pump is distributed to the main transmission cavity and the differential cavity through the housing oil passage.

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