A four-speed automatic transmission bridge for electric vehicles

Abstract

The present invention discloses a four-speed automatic transmission axle for an electric vehicle, which includes a drive motor, a transmission, and a differential. The transmission is composed of an input shaft, a secondary shaft, a through shaft, an intermediate shaft, six sets of meshing gear pairs, and two sets of shift actuating mechanisms. The shift actuating mechanism is composed of two engaging teeth and a sliding sleeve. The drive motor transmits power to the transmission. Through the combined actions of the shift actuating mechanisms, multi-stage speed reduction of the transmission is achieved, and power is input to the differential to split and output power. It has the advantages of a wide speed ratio range, taking into account economy and high reliability, and a compact structure that saves space.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle transmissions and relates to a four-speed automatic transmission axle for electric vehicles. Background Art

[0002] As a new energy power system solution, there are three new types of electric axles: in-wheel motors, wheel hub motors, and mid-mounted motor drive axles. The above-mentioned electric drive axles generally adopt direct drive and reduction. Single-speed transmission needs to balance high and low speed performance, which requires high performance of the motor. During low-speed driving, the working efficiency of the motor is only 60%-70%. In order to improve the power performance and economy of the whole vehicle, a multi-speed transmission system is the development trend of electric drive axles. At the same time, the speed ratio range of the multi-speed transmission system is large, which reduces the performance requirements of the drive motor.

[0003] At present, two sets of integrated motors and reducers are used in the market, which are arranged on both sides of the drive axle. While improving reliability, it greatly increases the cost and weight of the whole axle. At the same time, for the solution of the dual-motor variable-speed electric drive axle, due to its own structural problems, the active regulation of the motor operation is poor, the motor operation efficiency is low, and the power consumption of the whole vehicle is very high. Summary of the Invention

[0004] The purpose of the present invention is to provide a four-speed automatic transmission axle for electric vehicles, which has the characteristics of a wide speed ratio range, taking into account economy and high reliability, and a compact structure that saves space.

[0005] The technical solution adopted by the present invention is a four-speed automatic transmission axle for electric vehicles, which includes a drive motor, a transmission, and a differential. The drive motor is connected to the transmission, and the transmission is connected to the differential; the drive motor is connected to the driving wheel of the first gear pair through an input shaft. The driving wheels of the second gear pair and the first gear pair are coaxially arranged on the second shaft, and the input shaft and the second shaft are arranged in parallel;

[0006] The driven wheels of the second gear pair and the third gear pair are supported by bearings and are coaxially sleeved on one end of a through shaft; the second shaft and the through shaft are arranged in parallel;

[0007] The first coupling sleeve is arranged on the through shaft and is located between the driven wheel of the second gear pair and the driven wheel of the third gear pair. The engaging tooth A is connected to the driven wheel of the second gear pair and is arranged on one side of the first coupling sleeve. The engaging tooth B is connected to the driven wheel of the third gear pair and is arranged on the other side of the first coupling sleeve;

[0008] On the other end of the through shaft, the driving wheel of the sixth gear pair, the driven wheel of the fifth gear pair, and the engaging tooth D are arranged in sequence; the driven wheel of the fifth gear pair is supported by a bearing and is sleeved on the through shaft. The second coupling sleeve is arranged on the through shaft and is located between the driven wheel of the fifth gear pair and the engaging tooth D; the engaging tooth C is connected to the driven wheel of the fifth gear pair and is located on the side close to the second coupling sleeve;

[0009] The driving wheel of the fifth gear pair and the driven wheel of the fourth gear pair are coaxially arranged on the intermediate shaft, and the intermediate shaft and the through shaft are arranged in parallel; the driving wheel of the fourth gear pair is arranged on the through shaft; the driven wheel of the sixth gear pair is arranged on the output shaft of the differential.

[0010] Furthermore, the driving motor and the driving wheel of the first gear pair are coaxially arranged.

[0011] Furthermore, the first gear pair, the second gear pair, the third gear pair, the fourth gear pair, the fifth gear pair and the sixth gear pair are all external meshing gear pairs, and the gears are all helical cylindrical gears.

[0012] A driving mode of a four-speed automatic transmission for an electric vehicle, in which the first coupling sleeve is combined with the coupling tooth A, and the second coupling sleeve is combined with the coupling tooth C; the input power is transmitted to the differential through the first gear pair, the second gear pair, the fourth gear pair, the fifth gear pair and the sixth gear pair, and the power is output through the differential.

[0013] In one embodiment, the first coupling sleeve is combined with the coupling tooth A, and the second coupling sleeve is combined with the coupling tooth D; the input power is transmitted to the differential through the first gear pair, the second gear pair and the sixth gear pair, and the power is output through the differential.

[0014] In one embodiment, the first coupling sleeve is combined with the coupling tooth B, and the second coupling sleeve is combined with the coupling tooth D; the input power is transmitted to the differential through the first gear pair, the third gear pair and the sixth gear pair, and the power is output through the differential.

[0015] In one embodiment, the first coupling sleeve is combined with the coupling tooth B, and the second coupling sleeve is combined with the coupling tooth D; the input power is transmitted to the differential through the first gear pair, the third gear pair, the fourth gear pair, the fifth gear pair and the sixth gear pair, and the power is output through the differential.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The device of the present invention adopts a parallel arrangement of the motor and the electric drive axle system, with a short transmission route, a small axial dimension, a compact structure and a light weight;

[0018] 2. The device of the present invention adopts an optimized multi-stage transmission, effectively balancing the requirements of structural design and the maximization of bearing life, and the power performance is continuous and reliable;

[0019] 3. The device of the present invention has the advantage of a wide speed ratio range, effectively shortening the axial width of the transmission system and improving the adaptability of the vehicle layout. Brief Description of the Drawings

[0020] Figure 1It is a schematic diagram of the connection of various components of the four-speed automatic transmission bridge for electric vehicles of the present invention;

[0021] Figure 2 It is the power transmission route of the present invention Figure 1 ;

[0022] Figure 3 It is the power transmission route of the present invention Figure 2 ;

[0023] Figure 4 It is the power transmission route of the present invention Figure 3 ;

[0024] Figure 5 It is the power transmission route of the present invention Figure 4 .

[0025] In the figure, 1. drive motor, 2. input shaft, 3. first gear pair, 4. second shaft, 5. second gear pair, 6. through shaft, 7. engaging tooth A, 8. first engaging sleeve, 9. engaging tooth B, 10. fourth gear pair, 11. intermediate shaft, 12. differential, 13. sixth gear pair, 14. fifth gear pair, 15. engaging tooth C, 16. second engaging sleeve, 17. engaging tooth D, 18. third gear pair. Specific embodiments

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] As Figure 1 shown: A four-speed automatic transmission bridge for electric vehicles includes a drive motor 1, a transmission, and a differential 12. The drive motor 1 is connected to the transmission, and the transmission is connected to the differential 12; the drive motor 1 is connected to the driving wheel of the first gear pair 3 through the input shaft 2. The driving wheels of the second gear pair 5 and the driven wheel of the first gear pair 3 are coaxially arranged on the second shaft 4, and the input shaft 2 and the second shaft 4 are arranged in parallel;

[0028] The driven wheels of the second gear pair 5 and the third gear pair 18 are supported by bearings and are coaxially sleeved on one end of the through shaft 6; the second shaft 4 and the through shaft 6 are arranged in parallel;

[0029] The first engaging sleeve 8 is arranged on the through shaft 6 and is located between the driven wheel of the second gear pair 5 and the driven wheel of the third gear pair 18. The engaging tooth A7 is connected to the driven wheel of the second gear pair 5 and is arranged on one side of the first engaging sleeve 8. The engaging tooth B9 is connected to the driven wheel of the third gear pair 18 and is arranged on the other side of the first engaging sleeve 8;

[0030] At the other end of the through shaft 6, there are successively arranged the driving wheel of the sixth gear pair 13, the driven wheel of the fifth gear pair 14, and the engaging tooth D17; the driven wheel of the fifth gear pair 14 is supported by a bearing and is sleeved on the through shaft 6 loosely. The second engaging sleeve 16 is arranged on the through shaft 6 and is located between the driven wheel of the fifth gear pair 14 and the engaging tooth D17; the engaging tooth C15 is connected to the driven wheel of the fifth gear pair 14 and is located on the side close to the second engaging sleeve 16.

[0031] The driving wheel of the fifth gear pair 14 and the driven wheel of the fourth gear pair 10 are coaxially arranged on the intermediate shaft 11. The intermediate shaft 11 and the through shaft 6 are arranged in parallel; the driving wheel of the fourth gear pair 10 is arranged on the through shaft 6; the driven wheel of the sixth gear pair 13 is arranged on the output shaft of the differential 12.

[0032] The drive motor 1 and the driving wheel of the first gear pair 3 are coaxially arranged.

[0033] The first gear pair 3, the second gear pair 5, the third gear pair 18, the fourth gear pair 10, the fifth gear pair 14, and the sixth gear pair 13 are all external meshing gear pairs, and the gears are all helical cylindrical gears.

[0034] A driving method of a four-speed automatic transmission for an electric vehicle is as follows:

[0035] As Figure 2 shown, make the first engaging sleeve 8 engage with the engaging tooth A7, and the second engaging sleeve 16 engage with the engaging tooth C15; the input power is transmitted to the differential 12 through the first gear pair 3, the second gear pair 5, the fourth gear pair 10, the fifth gear pair 14, and the sixth gear pair 13, and the power is output through the differential 12.

[0036] As Figure 3 shown, make the first engaging sleeve 8 engage with the engaging tooth A7, and the second engaging sleeve 16 engage with the engaging tooth D17; the input power is transmitted to the differential 12 through the first gear pair 3, the second gear pair 5, and the sixth gear pair 13, and the power is output through the differential 12.

[0037] As Figure 4 shown, make the first engaging sleeve 8 engage with the engaging tooth B9, and the second engaging sleeve 16 engage with the engaging tooth D17; the input power is transmitted to the differential 12 through the first gear pair 3, the third gear pair 18, and the sixth gear pair 13, and the power is output through the differential 12.

[0038] As Figure 5 shown, make the first engaging sleeve 8 engage with the engaging tooth B9, and the second engaging sleeve 16 engage with the engaging tooth D17; the input power is transmitted to the differential 12 through the first gear pair 3, the third gear pair 18, the fourth gear pair 10, the fifth gear pair 14, and the sixth gear pair 13, and the power is output through the differential 12.

Claims

1. A four-speed automatic transmission bridge for an electric vehicle, comprising a drive motor (1), a transmission, and a differential (12). The drive motor (1) is connected to the transmission, and the transmission is connected to the differential (12); characterized in that, The drive motor (1) is connected to the driving wheel of the first gear pair (3) through the input shaft (2). The driving wheels of the second gear pair (5) and the driven wheel of the first gear pair (3) are coaxially arranged on the secondary shaft (4), and the input shaft (2) and the secondary shaft (4) are arranged in parallel; the driven wheel of the second gear pair (5) and the driven wheel of the third gear pair (18) are supported by bearings and are coaxially sleeved on one end of the through shaft (6); the secondary shaft (4) and the through shaft (6) are arranged in parallel; the first coupling sleeve (8) is arranged on the through shaft (6) and is located between the driven wheel of the second gear pair (5) and the driven wheel of the third gear pair (18). The coupling teeth A (7) are connected to the driven wheel of the second gear pair (5) and are arranged on one side of the first coupling sleeve (8), and the coupling teeth B (9) are connected to the driven wheel of the third gear pair (18) and are arranged on the other side of the first coupling sleeve (8); on the other end of the through shaft (6), there are successively arranged the driving wheel of the sixth gear pair (13), the driven wheel of the fifth gear pair (14), and the coupling teeth D (17); the driven wheel of the fifth gear pair (14) is supported by a bearing and is sleeved on the through shaft (6), and the second coupling sleeve (16) is arranged on the through shaft (6) and is located between the driven wheel of the fifth gear pair (14) and the coupling teeth D (17); the coupling teeth C (15) are connected to the driven wheel of the fifth gear pair (14) and are located on the side close to the second coupling sleeve (16); the driving wheel of the fifth gear pair (14) and the driven wheel of the fourth gear pair (10) are coaxially arranged on the intermediate shaft (11), and the intermediate shaft (11) and the through shaft (6) are arranged in parallel; the driving wheel of the fourth gear pair (10) is arranged on the through shaft (6); the driven wheel of the sixth gear pair (13) is arranged on the output shaft of the differential (12).

2. The four-speed automatic transmission bridge for an electric vehicle according to claim 1, wherein, The drive motor (1) and the driving wheel of the first gear pair (3) are coaxially arranged.

3. The four-speed automatic transmission bridge for an electric vehicle according to claim 1, wherein, The first gear pair (3), the second gear pair (5), the third gear pair (18), the fourth gear pair (10), the fifth gear pair (14), and the sixth gear pair (13) are all external meshing gear pairs, and the gears are all helical cylindrical gears.

4. A four-speed automatic transmission bridge for an electric vehicle according to any one of claims 1-3, characterized in that, For this automatic transmission, the first coupling sleeve (8) is combined with the coupling teeth A (7), and the second coupling sleeve (16) is combined with the coupling teeth C (15); the input power is transmitted to the differential (12) through the first gear pair (3), the second gear pair (5), the fourth gear pair (10), the fifth gear pair (14), and the sixth gear pair (13), and the power is output through the differential (12).

5. A four-speed automatic transmission bridge for an electric vehicle according to any one of claims 1-3, characterized in that, For this automatic transmission, the first coupling sleeve (8) is combined with the coupling teeth A (7), and the second coupling sleeve (16) is combined with the coupling teeth D (17); the input power is transmitted to the differential (12) through the first gear pair (3), the second gear pair (5), and the sixth gear pair (13), and the power is output through the differential (12).

6. A four-speed automatic transmission bridge for an electric vehicle according to any one of claims 1-3, characterized in that, The first engaging sleeve (8) of the automatic transmission is engaged with the engaging tooth B (9), and the second engaging sleeve (16) is engaged with the engaging tooth D (17); the input power is transmitted to the differential (12) through the first gear pair (3), the third gear pair (18) and the sixth gear pair (13), and the power is output through the differential (12).

7. An automatic four-speed transmission bridge for an electric vehicle according to any one of claims 1-3, characterized in that The first engaging sleeve (8) of the automatic transmission is engaged with the engaging tooth B (9), and the second engaging sleeve (16) is engaged with the engaging tooth D (17); the input power is transmitted to the differential (12) through the first gear pair (3), the third gear pair (18), the fourth gear pair (10), the fifth gear pair (14) and the sixth gear pair (13), and the power is output through the differential (12).

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