Electro-dynamic powertrain forced lubrication system

Abstract

The invention relates to a forced lubrication system for an electric powertrain, comprising an oil pump; a plurality of shunt oil passages, all of which are connected to the oil pump and used for shunt lubricating oil; two oil pipes I, respectively connected to the shunt oil passage I and the shunt oil passage II, and used for conveying lubricating oil to bearings on both sides of a differential; an oil pipe II, connected to the shunt oil passage III, and used for conveying lubricating oil to two sets of meshing sleeves and an input-stage active cylindrical gear; a bearing connecting plate, connected to the oil pipe II, and provided with an oil passage II, wherein the oil passage II is used for conveying lubricating oil to the input-stage cylindrical bearing; an oil passage III, connected to the oil pipe II, and used for conveying lubricating oil to the input-stage ball bearing and a single-axis ball bearing; an oil passage IV, used for conveying lubricating oil to driven cylindrical gears of each gear; an oil passage V, connected to the oil passage IV, and used for conveying lubricating oil to the single-axis cylindrical bearing; an oil collecting hood, wherein the oil collecting hood is connected to the oil passage IV, and the lubricating oil in the oil collecting hood is used for lubricating the ball bearing of the shift shaft, and the oil collecting hood has the advantage of being able to effectively lubricate various transmission parts of the electric powertrain.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive lubrication devices, and particularly relates to a forced lubrication system for an electric powertrain. Background Art

[0002] Currently, an integrated electric powertrain integrates a motor, a transmission, and an axle differential highly into one body, eliminating the drive shaft, which can effectively save space and reduce weight. Due to the special nature of its structure, it is difficult to lubricate the transmission parts above the transmission by the method of gear stirring oil and splashing lubrication. To solve this problem and ensure the reliability of the product, a forced lubrication system for a commercial vehicle electric powertrain is designed, which is combined with gear stirring oil and splashing lubrication to effectively lubricate each transmission part of the electric powertrain. Summary of the Invention

[0003] To solve the problems in the above background art, the present invention provides a forced lubrication system for a power assembly, which has the advantage of effectively lubricating each transmission part of the electric powertrain.

[0004] The present invention is realized through the following technical solutions:

[0005] A forced lubrication system for an electric powertrain, comprising

[0006] An oil pump for injecting lubricating oil into the lubrication system;

[0007] A plurality of shunt oil channels, including shunt oil channel I, shunt oil channel II, shunt oil channel III, and shunt oil channel IV, all of which are connected to the oil pump and are used for shunting lubricating oil;

[0008] Two oil pipes I, which are respectively connected to the shunt oil channel I and the shunt oil channel II, and are used for transporting lubricating oil to the bearings on both sides of the differential;

[0009] An oil pipe II, which is connected to the shunt oil channel III and is used for transporting lubricating oil to two groups of engaging sleeves and the input stage driving cylindrical gear;

[0010] A bearing connecting plate, which is connected to the oil pipe II and is provided with an oil channel II, and the oil channel II is used for transporting lubricating oil to the input stage cylindrical bearing;

[0011] An oil channel III, which is connected to the oil pipe II and is used for transporting lubricating oil to the input stage ball bearing and the single-axis ball bearing;

[0012] An oil channel IV for transporting lubricating oil to each gear driven cylindrical gear;

[0013] An oil channel V, which is connected to the oil channel IV and is used for transporting lubricating oil to the single-axis cylindrical bearing;

[0014] An oil collecting cover, which is communicated with the oil passage IV, and the lubricating oil in the oil collecting cover is used to lubricate the shift shaft ball bearing.

[0015] As a further description of the invention: It further includes an oil collecting plate, which is fixedly arranged on the differential housing. An oil inlet, an oil outlet I or an oil outlet II are arranged on the oil collecting plate. A plurality of the shunt oil passages are all arranged on the oil collecting plate, and the plurality of shunt oil passages are communicated with each other. Two oil pipes I are communicated with the shunt oil passage I and the shunt oil passage II. The oil pipe II is communicated with the shunt oil passage III. The oil outlet I or the oil outlet II is communicated with the plurality of shunt oil passages.

[0016] As a further description of the invention: It further includes a filter assembly, which is fixedly connected to the differential housing, and the filter assembly is aligned with the oil inlet of the oil collecting plate.

[0017] As a further description of the invention: It further includes an oil pump cover plate, which is fixedly arranged on the side of the oil collecting plate away from the differential. The opening direction of the oil pump cover plate corresponds to the oil outlet I or the oil outlet II, and the oil pump cover plate covers the oil pump.

[0018] As a further description of the invention: It further includes an oil collecting cover fixedly connected to the oil collecting plate. The oil collecting cover is set as a U-shaped rotary structure, and the oil collecting cover is aligned with the shunt oil passage IV on the oil collecting plate.

[0019] As a further description of the invention: A gap for the lubricating oil to flow into the oil collecting cover is arranged between the oil collecting cover and the joint.

[0020] As a further description of the invention: The oil pipe II is successively provided with an oil outlet hole I, an oil outlet hole II, an oil outlet hole III and an oil outlet hole IV along its axial direction. The oil outlet hole I, the oil outlet hole II and the oil outlet hole IV are respectively aligned with two groups of sliding engagement sleeves and the input stage driving cylindrical gear. The oil outlet hole III is aligned with the flange of the bearing connecting plate.

[0021] As a further description of the invention: The oil passage V is set as a cone.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] 1. When the device is in use, power is transmitted through the cylindrical gear pair of the oil pump. Driven by the intermediate shaft, the oil pump rotates. The oil pump sucks lubricating oil from the oil inlet into the inner cavity of the oil pump cover. Before entering the oil inlet, the lubricating oil passes through the filter assembly. Then, under the pressure of the oil pump, the lubricating oil flows from the inner cavity of the oil pump cover into the four shunt oil channels through the oil outlet I or oil outlet II. The lubricating oil flows into the two oil pipes I, oil pipe II, and oil pipe III along the four shunt oil channels respectively. The lubricating oil entering the two oil pipes I is transported to the bearings on both sides of the differential. The lubricating oil entering the oil pipe II is sprayed from the oil outlet holes I, II, and IV onto the two sets of sliding meshing sleeves and the input stage driving cylindrical gear. The oil outlet hole III is aligned with the flange of the bearing connecting plate. The lubricating oil flowing out of the oil outlet hole III is collected by the flange of the bearing connecting plate and then transported to the input stage cylindrical bearing through the oil channel II on the bearing connecting plate. The lubricating oil entering the oil pipe III flows to the oil channel III on the end cover through the end, and is transported to the input stage ball bearing and the single bearing ball bearing through the oil channel III. For the lubricating oil entering the shunt oil channel IV, part of it is transmitted to the oil channel IV through the joint for lubricating each gear driven cylindrical gear, and is collected into the oil channel V at the end of the oil channel IV. As the single shaft rotates, the lubricating oil is recovered on the conical inner wall and finally lubricates the single shaft cylindrical bearing through the oil hole. Since the joint is concentric with the inner hole of the oil collecting cover and there is a gap, part of the lubricating oil can flow out through the gap and be collected by the inner wall of the oil collecting cover for lubricating the shift ball bearing.

[0024] 2. Since the oil outlet I and oil outlet II are provided on the oil collecting plate, the use requirements of two power directions can be satisfied simultaneously, and the same set of mechanical structure can be used under different motor rotation directions. Description of the Drawings

[0025] Figure 1 It is a connection schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of the oil collecting plate of the present invention.

[0027] Figure 3 It is a schematic diagram of the structure after removing the internal structure of the reducer of the present invention, intended to show the oil pipe I, oil pipe II, and oil pipe III.

[0028] Figure 4 It is a schematic diagram of the structure of the oil pipe III of the present invention.

[0029] Description of the Reference Numerals

[0030] 1. Differential housing; 11. Oil pump; 111. Oil pump cover plate; 12. Filter assembly; 2. Oil collecting plate; 21. Diverting oil passage I; 22. Diverting oil passage II; 23. Diverting oil passage III; 24. Diverting oil passage IV; 25. Oil outlet I; 26. Oil outlet II; 27. Oil inlet; 31. Oil pipe I; 32. Oil pipe II; 321. Oil outlet hole I; 322. Oil outlet hole II; 323. Oil outlet hole III; 324. Oil outlet hole IV; 4. Bearing connecting plate; 41. Oil passage II; 5. End cover; 51. Oil passage III; 6. Shift shaft; 61. Oil passage IV; 62. Connector; 7. Single shaft; 71. Oil passage V; 8. Oil collecting cover; 9. Intermediate shaft. Detailed implementation mode

[0031] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0033] In addition, the terms "horizontal", "vertical", etc. do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] As Figures 1 to 4 shown, an electric powertrain forced lubrication system includes:

[0036] An oil pump 11 for injecting lubricating oil into the lubrication system. Specifically, the oil pump 11 is driven by a cylindrical gear pair of the oil pump 11. The driving cylindrical gear of the cylindrical gear pair of the oil pump 11 is arranged on the intermediate shaft 9 through key connection, washers and snap rings. The driven cylindrical gear of the oil pump 11 is installed on the driving shaft of the oil pump 11 through interference connection.

[0037] A plurality of shunt oil channels, including shunt oil channel I 21, shunt oil channel II 22, shunt oil channel III 23 and shunt oil channel IV 24, are all connected to the oil pump 11 and used for shunting lubricating oil.

[0038] Two oil pipes I 31 are respectively connected to the shunt oil channel I 21 and the shunt oil channel II 22 and used for transporting lubricating oil to the bearings on both sides of the differential.

[0039] An oil pipe II 32 is connected to the shunt oil channel III 23 and used for transporting lubricating oil to two groups of engaging sleeves and the driving cylindrical gear of the input stage.

[0040] A bearing connecting plate 4 is connected to the oil pipe II 32 and is provided with an oil channel II 41. The oil channel II 41 is used for transporting lubricating oil to the cylindrical bearing of the input stage.

[0041] An oil channel III 51 is connected to the oil pipe II 32 and is used for transporting lubricating oil to the ball bearing of the input stage and the 7-ball bearing of the single shaft. Specifically, the oil channel III 51 is arranged on the end cover 5.

[0042] An oil channel IV 61 is used for transporting lubricating oil to the driven cylindrical gears of each gear.

[0043] An oil channel V 71 is connected to the oil channel IV 61 and is used for transporting lubricating oil to the 7-cylindrical bearing of the single shaft. The oil channel V 71 is set to be conical. Specifically, the oil channel V 71 is aligned with the oil channel IV 61, and lubricating oil is collected into the oil channel V 71 at the end of the oil channel IV 61 and finally lubricates the 7-cylindrical bearing of the single shaft through the oil hole.

[0044] An oil collecting cover 8 is connected to the oil channel IV 61. The lubricating oil in the oil collecting cover 8 is used for lubricating the ball bearing of the shift shaft 6. Specifically, the oil collecting cover 8 is press-fitted on the oil collecting plate 2 through interference.

[0045] It further includes an oil collecting plate 2, which is fixedly arranged on the differential housing 1. An oil inlet 27, an oil outlet I 25 or an oil outlet II 26 is arranged on the oil collecting plate 2. A plurality of shunt oil channels are all arranged on the oil collecting plate 2 and are communicated with each other. Two oil pipes I 31 are communicated with the shunt oil channel I 21 and the shunt oil channel II 22. The oil pipe II 32 is communicated with the shunt oil channel III 23. The oil outlet I 25 or the oil outlet II 26 is communicated with the plurality of shunt oil channels. Specifically, the oil collecting plate 2 is bolted to the differential housing 1. The oil pipe I 31 and the oil pipe II 32 are inserted between the differential housing 1 and the oil collecting plate 2.

[0046] It further includes a filter assembly 12, which is fixedly connected to the differential housing 1 and is aligned with the oil inlet 27 of the oil collecting plate 2. An opening for installing the filter assembly 12 is provided on the differential housing 1 corresponding to the oil inlet 27 of the oil collecting plate 2. The filter assembly 12 is cylindrical and is inserted into the opening on the differential housing.

[0047] It further includes an oil pump cover plate 111, which is fixedly arranged on the side of the oil collecting plate 2 away from the differential. The opening direction of the oil pump cover plate 111 corresponds to the oil outlet I 25 or the oil outlet II 26, and the oil pump cover plate 111 covers the oil pump 11. Specifically, the oil pump 11 sucks the lubricating oil into the cavity inside the oil pump cover plate 111 through the oil inlet 27, and then transports the lubricating oil into the plurality of shunt oil channels through the oil outlet I 25 or the oil outlet II 26. When the power direction of the motor is different, the lubricating oil can be transported to the oil outlet I 25 or the oil outlet II 26 on the oil collecting plate 2. The opening direction of the oil pump cover plate 111 needs to be installed corresponding to the oil outlet I 25 or the oil outlet II 26, and the installation position of the oil pump 11 inside the oil pump cover plate 111 also changes accordingly.

[0048] It further includes an oil collecting cover 8 fixedly connected to the oil collecting plate 2. The oil collecting cover 8 is set as a U-shaped rotary structure and is aligned with the shunt oil channel IV 24 on the oil collecting plate 2. There is a gap between the oil collecting cover 8 and the joint 62 for the lubricating oil to flow into the oil collecting cover 8.

[0049] It further includes a joint 62. An oil channel IV 61 is arranged on the shift shaft 6. The joint 62 is fixedly arranged on the shift shaft 6 and is communicated with the oil channel IV 61. There is a gap between the oil collecting cover 8 and the joint 62 for the lubricating oil to flow into the oil collecting cover 8. Specifically, the joint 62 is installed on the shift shaft 6 by bolts.

[0050] The oil pipe II 32 is successively provided with an oil outlet hole I 321, an oil outlet hole II 322, an oil outlet hole III 323 and an oil outlet hole IV 324 along its axial direction. The oil outlet hole I 321, the oil outlet hole II 322 and the oil outlet hole IV 324 are respectively aligned with two groups of sliding engagement sleeves and the input-stage driving cylindrical gear, and the oil outlet hole III 323 is aligned with the flange of the bearing connecting plate 4.

[0051] The working principle of the present invention is as follows:

[0052] When the device is in use, power is transmitted through the cylindrical gear pair of the oil pump 11. Driven by the intermediate shaft 9, the oil pump 11 rotates. The oil pump 11 sucks lubricating oil from the oil inlet 27 into the inner cavity of the oil pump cover plate 111. Before entering the oil inlet 27, the lubricating oil will pass through the filtration of the filter assembly 12. Then, under the pressure of the oil pump 11, the lubricating oil flows from the inner cavity of the oil pump cover plate 111 into the four shunt oil channels through the oil outlet I 25 or the oil outlet II 26. The lubricating oil enters the two oil pipes I 31, the oil pipe II 32, and the oil pipe III along the four shunt oil channels respectively. The lubricating oil entering the two oil pipes I 31 is transported to the bearings on both sides of the differential. The lubricating oil entering the oil pipe II 32 is sprayed from the oil outlet hole I 321, the oil outlet hole II 322 and the oil outlet hole IV 324 onto the two groups of sliding inner sleeves and the input-stage driving cylindrical gear. The oil outlet hole III 323 is aligned with the flange of the bearing connecting plate 4. The lubricating oil flowing out of the oil outlet hole III 323 is collected by the flange of the bearing connecting plate 4, and then is transported to the input-stage original main bearing through the oil channel II 41 on the bearing connecting plate 4. The lubricating oil entering the oil pipe III flows to the oil channel III 51 on the end cover 5 through the end, and is transported to the input-stage ball bearing and the single-axis ball bearing through the oil channel III 51. For the lubricating oil entering the shunt oil channel IV 24, a part of it is transmitted to the oil channel IV 61 through the joint for lubricating each driven cylindrical gear, and is collected into the oil channel V 71 at the end of the oil channel IV 61. As the single shaft 7 rotates, the lubricating oil is recovered on the conical inner wall, and finally lubricates the single-hand cylindrical bearing through the oil hole. Since the joint 62 is concentric with the inner hole of the oil collecting cover 8 and there is a gap, a part of the lubricating oil can flow out through the gap and is collected by the inner wall of the oil collecting cover 8 for lubricating the shift ball bearing.

[0053] The above-given embodiments are the relatively optimal examples for implementing the present invention, and the present invention is not limited to the above embodiments. Any non-essential addition or replacement made by those skilled in the art according to the technical features of the technical solution of the present invention falls within the protection scope of the present invention.

Claims

1. An electric powertrain forced lubrication system, characterized in that: including an oil pump (11) for injecting lubricating oil into the lubrication system; the oil pump (11) is driven by an oil pump cylindrical gear pair, the driving cylindrical gear of the oil pump cylindrical gear pair is arranged on the intermediate shaft (9) through key connection, washer and snap ring, and the driven cylindrical gear of the oil pump is installed on the oil pump drive shaft through interference connection; a plurality of shunt oil channels, including shunt oil channel I (21), shunt oil channel II (22), shunt oil channel III (23) and shunt oil channel IV (24), all communicating with the oil pump (11) for shunting lubricating oil; two oil pipes I (31) respectively communicating with the shunt oil channel I (21) and the shunt oil channel II (22) for transporting lubricating oil to the bearings on both sides of the differential; an oil pipe II (32) communicating with the shunt oil channel III (23) for transporting lubricating oil to two groups of engaging sleeves and the driving cylindrical gear of the input stage; a bearing connecting plate (4) communicating with the oil pipe II (32) and provided with an oil channel II (41) for transporting lubricating oil to the cylindrical bearing of the input stage; an oil channel III (51) communicating with the oil pipe II (32) for transporting lubricating oil to the ball bearing of the input stage and the ball bearing of the single shaft (7); the oil channel III (51) is arranged on the end cover (5); an oil channel IV (61) for transporting lubricating oil to the driven cylindrical gears of each gear; the oil channel IV (61) is arranged on the shift shaft (6); an oil channel V (71) communicating with the oil channel IV (61) for transporting lubricating oil to the cylindrical bearing of the single shaft (7); an oil collecting cover (8) communicating with the oil channel IV (61), and the lubricating oil in the oil collecting cover (8) is used to lubricate the ball bearing of the shift shaft (6); further including an oil collecting plate (2) fixedly arranged on the differential housing (1), the oil collecting plate (2) is provided with an oil inlet (27), an oil outlet I (25) and an oil outlet II (26), a plurality of the shunt oil channels are all arranged on the oil collecting plate (2), the plurality of shunt oil channels are communicated with each other, and the oil outlet I (25) and the oil outlet II (26) are communicated with the plurality of shunt oil channels; further including an oil pump cover plate (111) fixedly arranged on the side of the oil collecting plate (2) away from the differential, the opening direction of the oil pump cover plate (111) corresponds to the oil outlet I (25) or the oil outlet II (26), and the oil pump cover plate (111) covers the oil pump (11).

2. The forced lubrication system for an electric powertrain according to claim 1, wherein: further including a filter screen assembly (12) fixedly connected with the differential housing (1), and the filter screen assembly (12) is aligned with the oil inlet (27) of the oil collecting plate (2).

3. The forced lubrication system for an electric powertrain according to claim 1, characterized in that: further including an oil collecting cover (8) fixedly connected with the oil collecting plate (2), the oil collecting cover (8) is arranged in a U-shaped rotary structure, and the oil collecting cover (8) is aligned with the shunt oil channel IV (24) on the oil collecting plate (2).

4. The forced lubrication system for an electric powertrain according to claim 1, characterized in that: further including a joint (62) fixedly arranged on the shift shaft (6) and communicating with the oil channel IV (61).

5. The forced lubrication system for an electric powertrain according to claim 1, wherein: When the forced lubrication system of the electric powertrain is in use, power is transmitted through the cylindrical gear pair of the oil pump (11). Driven by the intermediate shaft (9), the oil pump (11) rotates. The oil pump (11) sucks lubricating oil from the oil inlet (27) into the inner cavity of the oil pump cover plate (111). Before entering the oil inlet (27), the lubricating oil passes through the filtration of the filter assembly (12). Then, under the pressure of the oil pump (11), the lubricating oil flows from the inner cavity of the oil pump cover plate (111) into the four shunt oil channels through the oil outlet I (25) or the oil outlet II (26). The lubricating oil enters the two oil pipes I (31), the oil pipe II (32), and the oil pipe III (51) along the four shunt oil channels respectively. The lubricating oil entering the two oil pipes I (31) is transported to the bearings on both sides of the differential. The lubricating oil entering the oil pipe II (32) is sprayed onto the two groups of sliding inner kernel sleeves and the input stage driving cylindrical gear through the oil outlet holes I (321), the oil outlet holes II (322), and the oil outlet holes IV (324). The oil outlet hole III (323) is aligned with the flange of the bearing connecting plate (4). The lubricating oil flowing out of the oil outlet hole III (323) is collected by the flange of the bearing connecting plate (4), and then is transported to the input stage original main bearing through the oil channel II (41) on the bearing connecting plate (4). The lubricating oil entering the oil pipe III (51) flows to the oil channel III (51) on the end cover (5) at the end, and is transported to the input stage ball bearing and the single-shaft ball bearing through the oil channel III (51). For the lubricating oil entering the shunt oil channel IV (24), a part of it is transmitted to the oil channel IV (61) through the joint (62) for lubricating each driven cylindrical gear, and is collected into the oil channel V (71) at the end of the oil channel IV (61). As the single shaft (7) rotates, the lubricating oil is recovered on the conical inner wall and finally lubricates the single-shaft cylindrical bearing through the oil hole. Since the joint (62) is concentric with the inner hole of the oil collecting cover (8) and there is a gap, a part of the lubricating oil can flow out through the gap and is collected by the inner wall of the oil collecting cover (8) to lubricate the shift ball bearing.

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