Low-loss lubricating system of electric drive axle

Abstract

The utility model relates to a low-loss lubricating system of an electric drive axle, which comprises an axle housing assembly, the axle housing assembly comprises an axle housing middle section, a left half axle housing and a right half axle housing are respectively arranged on the left side and the right side of the axle housing middle section, a box cover is further arranged between the axle housing middle section and the right half axle housing, a partition plate is arranged in the middle of the axle housing middle section, and the partition plate and the left half axle housing form a left sealing cavity. A right sealing cavity is formed by the partition plate and the box cover, a differential mechanism assembly is arranged in the left sealing cavity, and a transmission gear shifting gear shaft system is arranged in the right sealing cavity. The axle housing structure is optimized, active lubrication and passive lubrication are organically combined, existing conventional transmission parts of a conventional electric drive axle are fully utilized, and on the premise that cost is increased as little as possible, the electric drive axle is fully lubricated through lubrication space partition, independent gear / bearing lubrication and additional arrangement of a lubricating oil collection and storage cavity. The electric drive axle transmission system is guaranteed to be fully lubricated, meanwhile, the lubricating oil amount is reduced to the minimum, lubricating oil stirring loss and lubricating resistance are remarkably reduced, the efficiency of the transmission system is improved, and low energy consumption is achieved.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicle technology, and in particular to a low-loss lubrication system for an electric drive axle. Background Technology

[0002] With the accelerated development of electrification of commercial vehicles, electric drive axles have been widely used due to their advantages of short transmission routes, high integration, and light weight. However, as new energy commercial vehicles increase their requirements for driving range and energy consumption, how to improve the system efficiency of electric drive axles and reduce losses has become a research hotspot in the field of electric drive axles.

[0003] The main factor affecting the efficiency of electric drive axle systems is the frictional loss generated by gears and bearings in the transmission system. To solve this problem, the current common approach is to optimize the transmission shaft system, use high-performance, low rolling resistance, and low friction transmission components, and at the same time optimize the lubrication system to improve the lubrication effect between various transmission components, thereby reducing the frictional loss of the transmission system and improving the transmission efficiency.

[0004] However, due to the power requirements of vehicles, the drive shaft system of electric drive axles is gradually developing towards multi-speed and integration. The number of gear pairs and bearings involved in the transmission has increased significantly, and the cost of using high-performance components has increased substantially, limiting the promotion and application of electric drive axles. On the other hand, the lubrication methods of electric drive axles include passive lubrication and active lubrication. Passive lubrication relies on gear transmission splash lubrication and lubrication channels to complete the lubrication of various parts of the transmission gears and bearings. This structure can meet the lubrication needs of single-speed axles well. However, the transmission gear shaft system of multi-speed electric drive axles is complex, and passive lubrication is difficult to meet the full lubrication of gears and bearings in various parts. At the same time, excessive lubricating oil will lead to increased oil churning losses. Conventional active lubrication uses oil pumps and oil injection pipes to precisely spray lubricating oil to gear meshing and bearings. Although this method solves the problem of insufficient passive lubrication, a large amount of pumped oil is required to meet the full lubrication of various parts. The amount of lubricating oil used cannot be reduced, resulting in significant oil churning losses. At the same time, the high flow rate of lubricating oil at the bearings will also generate significant rolling resistance. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a low-loss lubrication system for electric drive bridges.

[0006] This utility model is achieved using the following technical solution:

[0007] A low-loss lubrication system for an electric drive axle includes an axle housing assembly. The axle housing assembly includes a middle section, with a left half-axle housing and a right half-axle housing respectively located on the left and right sides of the middle section. A cover is provided between the middle section and the right half-axle housing. A partition is provided in the middle of the middle section, forming a left sealed cavity with the partition and the left half-axle housing. The partition and the cover form a right sealed cavity. A differential assembly is provided in the left sealed cavity, and a transmission shift gear shaft system is provided in the right sealed cavity.

[0008] Furthermore, an external assembly is provided on the outer side of the middle section of the axle housing. The external assembly includes an electronic oil pump, a filter, and a cooler that are interconnected. The housing cover is provided with an oil baffle and an end cover. The end cover and the oil baffle form a third oil collection chamber. After the lubricating oil passes through the cooler and enters the motor, it enters the third oil collection chamber through the second connecting oil passage provided on the housing cover. The third oil collection chamber is connected to the hollow shaft of the transmission shift gear shaft system.

[0009] Furthermore, the cover is provided with a first oil collection chamber and a second oil collection chamber, and the middle section of the bridge housing is provided with a lubricating oil passage A and a lubricating oil passage B. The lubricating oil that has not passed through the cooler enters the first oil collection chamber and the second oil collection chamber through the lubricating oil passage B. The first oil collection chamber and the second oil collection chamber are respectively connected to the mounting bearing of the transmission shift gear shaft system.

[0010] The lubricating oil passage B is equipped with an oil injector, which is located at the gear meshing point of the transmission shift gear shaft system;

[0011] After the lubricating oil passes through the cooler and enters the motor, it connects with the second connecting oil passage provided on the housing cover through the lubricating oil passage A.

[0012] Furthermore, the first oil collecting chamber and the second oil collecting chamber are located at the end of the lubricating oil passage B, and the first oil collecting chamber and the second oil collecting chamber are connected through the first connecting oil passage.

[0013] Furthermore, the first oil collecting chamber and the second oil collecting chamber are positioned above the center plane of the bridge housing assembly, and the first oil collecting chamber is positioned above the second oil collecting chamber.

[0014] Furthermore, the connection point between the second connecting oil passage and the third oil collecting chamber is lower than the center point of the transmission shift gear shaft system.

[0015] Furthermore, the second connecting oil passage has a gradually upward-sloping trumpet-shaped structure.

[0016] Furthermore, the inclination angle β of the second connecting oil passage is 15 degrees to 20 degrees, and the opening angle θ of the second connecting oil passage is 5 degrees to 8 degrees.

[0017] Furthermore, the differential assembly is provided with several meshing gear rings, and the level of lubricating oil in the left sealing cavity is higher than the meshing points of the gear rings.

[0018] Furthermore, the electronic oil pump is provided with an oil inlet, and the oil inlet is located at the lowest point of the left sealing cavity; the lubricating oil level in the right sealing cavity is lower than the lowest point of the transmission shift gear shaft.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] By optimizing the axle housing structure and organically combining active and passive lubrication, and making full use of existing conventional transmission components of conventional electric drive axles, the lubrication space is divided into zones, gear / bearing lubrication is independent, and a lubricating oil collection and storage chamber is added. This ensures sufficient lubrication of the electric drive axle transmission system while minimizing the amount of lubricating oil, significantly reducing lubrication churning loss and lubrication resistance, improving transmission system efficiency, and achieving low energy consumption.

[0021] Tests have shown that the low-loss electric drive axle of this invention has a system efficiency that is 0-0.5 percentage points higher than that of conventional electric drive axles, with a significant reduction in losses, and the vehicle's range is increased by more than 3% under the same conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the axle housing assembly in this utility model;

[0023] Figure 2 This is a schematic diagram of the installation of the external assembly in this utility model;

[0024] Figure 3 This is a schematic diagram of the lubricating oil passage B in this utility model. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the lubricating oil passage B in this utility model. Figure 2 ;

[0026] Figure 5 This is a schematic diagram of the lubricating oil passage A in this utility model. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the lubricating oil passage A in this utility model. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the third oil collection chamber in this utility model;

[0029] Figure 8 This is a side view of the transmission shift gear shaft system in this utility model;

[0030] Figure 9 This is a schematic diagram of the structure of the box cover of this utility model;

[0031] Figure 10 This is an overall structural diagram of the electric drive bridge of the low-loss lubrication system of this utility model.

[0032] Figure Labels

[0033] 1. Middle section of axle housing; 101. Baffle plate; 102. Lubricating oil passage A; 103. Lubricating oil passage B; 2. Cover; 3. Transmission shift gear shaft system; 4. Differential assembly; 41. Gear ring; 5. End cover; 51. First connecting oil passage; 52. Second connecting oil passage; 6. Oil baffle; 7. Right half of axle housing; 8. Left half of axle housing; 9. Electronic oil pump; 91. Oil inlet; 10. Filter; 11. Cooler; 12. First oil collection chamber; 13. Second oil collection chamber; 14. Third oil collection chamber; 15. Motor. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0035] like Figures 1-10 As shown, a low-loss lubrication system for an electric drive axle includes an axle housing assembly. The axle housing assembly includes a middle section 1. A left half-axle housing 8 and a right half-axle housing 7 are respectively provided on the left and right sides of the middle section 1. A cover 2 is also provided between the middle section 1 and the right half-axle housing 7. A partition 101 is provided in the middle of the middle section 1. The partition 101 and the left half-axle housing 8 form a left sealed cavity. The partition 101 and the cover 2 form a right sealed cavity. A differential assembly 4 is provided in the left sealed cavity. A transmission shift gear shaft system 3 is provided in the right sealed cavity.

[0036] An external assembly is provided on the outer side of the middle section 1 of the axle housing. The external assembly includes an electronic oil pump 9, a filter 10 and a cooler 11 that are interconnected. The housing cover 2 is provided with an oil baffle 6 and an end cover 5. The end cover 5 and the oil baffle 6 form a third oil collection chamber 14. After the lubricating oil passes through the cooler 11 and enters the motor 15, it enters the third oil collection chamber 14 through the second connecting oil passage 52 provided on the housing cover 2. The third oil collection chamber 14 is connected to the hollow shaft of the transmission shift gear shaft system 3.

[0037] In the third episode, the oil chamber 14 is connected to the hollow shaft at the center of the transmission shift gear shaft system 3 for lubrication, thus completing the lubrication of the internal bearings of the transmission shift gear shaft system 3.

[0038] The cover 2 is provided with a first oil collection chamber 12 and a second oil collection chamber 13. The middle section 1 of the bridge housing is provided with a lubricating oil passage A102 and a lubricating oil passage B103. The lubricating oil that has not passed through the cooler 11 enters the first oil collection chamber 12 and the second oil collection chamber 13 through the lubricating oil passage B103. The first oil collection chamber 12 and the second oil collection chamber 13 are respectively connected to the mounting bearing of the transmission shift gear shaft system 3.

[0039] An oil injector is installed on the lubrication oil passage B103 to precisely lubricate the meshing gear parts of the transmission shift gear shaft system 3.

[0040] The lubricating oil passage B103 is equipped with an oil injector, which is located at the gear meshing point of the transmission shift gear shaft system 3;

[0041] After the lubricating oil passes through the cooler 11 and enters the motor 15, it connects with the second connecting oil passage 52 provided on the cover 2 through the lubricating oil passage A102.

[0042] The first oil collecting chamber 12 and the second oil collecting chamber 13 are located at the end of the lubricating oil passage B103, and the first oil collecting chamber 12 and the second oil collecting chamber 13 are connected through the first connecting oil passage 51.

[0043] The first oil collection chamber 12 and the second oil collection chamber 13 are located above the center plane of the bridge housing assembly, and the first oil collection chamber 12 is located higher than the second oil collection chamber 13.

[0044] The connection point between the second connecting oil passage 52 and the third oil collecting chamber 14 is lower than the center point of the transmission shift gear shaft system 3.

[0045] The second connecting oil passage 52 has a gradually upward-sloping trumpet-shaped structure.

[0046] The inclination angle β of the second connecting oil passage 52 is 15 degrees to 20 degrees, and the opening angle θ of the second connecting oil passage 52 is 5 degrees to 8 degrees.

[0047] The differential assembly 4 is provided with several meshing gear rings 41, and the level of lubricating oil in the left sealing cavity is higher than the meshing point of the gear rings 41.

[0048] according to Figures 7-8 As shown, the electronic oil pump 9 is provided with an oil inlet 91, and the oil inlet 91 is located at the lowest point of the left sealing cavity; the lubricating oil level in the right sealing cavity is lower than the lowest point of the transmission shift gear shaft system 3.

Claims

1. A low-loss lubrication system for an electric drive bridge, characterized in that, The axle housing assembly includes an axle housing middle section (1), with a left half axle housing (8) and a right half axle housing (7) on the left and right sides respectively. A cover (2) is provided between the axle housing middle section (1) and the right half axle housing (7). A partition (101) is provided in the middle of the axle housing middle section (1). The partition (101) and the left half axle housing (8) form a left sealed cavity. The partition (101) and the cover (2) form a right sealed cavity. A differential assembly (4) is provided in the left sealed cavity. A transmission shift gear shaft system (3) is provided in the right sealed cavity.

2. The low-loss lubrication system for the electric drive bridge according to claim 1, characterized in that, An external assembly is provided on the outer side of the middle section (1) of the bridge housing. The external assembly includes an electronic oil pump (9), a filter (10) and a cooler (11) that are interconnected. The housing cover (2) is provided with an oil baffle (6) and an end cover (5). The end cover (5) and the oil baffle (6) form a third oil collection chamber (14). After the lubricating oil passes through the cooler (11) and enters the motor (15), it enters the third oil collection chamber (14) through the second connecting oil passage (52) provided on the housing cover (2). The third oil collection chamber (14) is connected to the hollow shaft of the transmission shift gear shaft system (3).

3. The low-loss lubrication system for the electric drive bridge according to claim 2, characterized in that, The cover (2) is provided with a first oil collection chamber (12) and a second oil collection chamber (13). The middle section (1) of the bridge housing is provided with a lubricating oil passage A (102) and a lubricating oil passage B (103). The lubricating oil that has not passed through the cooler (11) enters the first oil collection chamber (12) and the second oil collection chamber (13) through the lubricating oil passage B (103). The first oil collection chamber (12) and the second oil collection chamber (13) are respectively connected to the mounting bearing of the transmission shift gear shaft system (3). The lubricating oil passage B (103) is provided with an oil injector, which is located at the gear meshing point of the transmission shift gear shaft system (3); After the lubricating oil passes through the cooler (11) and enters the motor (15), it connects with the second connecting oil passage (52) provided on the cover (2) through the lubricating oil passage A (102).

4. The low-loss lubrication system for the electric drive bridge according to claim 3, characterized in that, The first oil collecting chamber (12) and the second oil collecting chamber (13) are located at the end of the lubricating oil passage B (103), and the first oil collecting chamber (12) and the second oil collecting chamber (13) are connected through the first connecting oil passage (51).

5. The low-loss lubrication system for the electric drive bridge according to claim 4, characterized in that, The first oil collection chamber (12) and the second oil collection chamber (13) are positioned higher than the center plane of the bridge housing assembly, and the first oil collection chamber (12) is positioned higher than the second oil collection chamber (13).

6. The low-loss lubrication system for the electric drive bridge according to claim 2, characterized in that, The connection point between the second connecting oil passage (52) and the third oil collecting chamber (14) is lower than the center point of the transmission shift gear shaft system (3).

7. The low-loss lubrication system for the electric drive bridge according to claim 3, characterized in that, The second connecting oil passage (52) has a gradually upward-sloping trumpet-shaped structure.

8. The low-loss lubrication system for the electric drive bridge according to claim 7, characterized in that, The inclination angle β of the second connecting oil passage (52) is 15 degrees to 20 degrees, and the opening angle θ of the second connecting oil passage (52) is 5 degrees to 8 degrees.

9. The low-loss lubrication system for the electric drive bridge according to claim 2, characterized in that, The differential assembly (4) is provided with a plurality of meshing gear rings (41), and the level of the lubricating oil in the left sealing cavity is higher than the meshing points of the plurality of gear rings (41).

10. The low-loss lubrication system for the electric drive bridge according to claim 2, characterized in that, The electronic oil pump (9) is provided with an oil inlet (91), and the oil inlet (91) is located at the lowest point of the left sealing cavity; the lubricating oil level in the right sealing cavity is lower than the lowest point of the transmission shift gear shaft system (3).

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