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 driving motor, a transmission, and a differential. The transmission consists of an input shaft, a secondary shaft, a shifting shaft, a main shaft, an intermediate shaft, five sets of meshing gear pairs, and two sets of shifting actuating mechanisms. The shifting actuating mechanism is composed of two engaging teeth and a synchromesh sleeve. The driving motor transmits power to the transmission. Through the combined actions of the shifting actuating mechanisms, multi-stage speed reduction of the transmission is achieved and power is input to the reducer. The reducer further reduces speed and increases torque and distributes and outputs power from the differential. 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 invention belongs to the technical field of electric vehicle transmission, and relates to a four-speed automatic transmission bridge for an electric vehicle. Background Art

[0002] As a new energy power system solution, there are three new types of electric axles: hub motor, wheel side motor, and mid-mounted motor drive axle. The above-mentioned electric drive axles generally use direct drive reduction. Single-speed shifting needs to take into account both high and low speed performance, and has high performance requirements for the motor. During low-speed driving, the motor's working efficiency is only 60%-70%. In order to improve the power and economic driving of the whole vehicle, the multi-speed transmission system is the development trend of the electric drive axle. At the same time, the multi-speed transmission system has a large speed ratio range, 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 entire axle. At the same time, the solution of using a dual-motor variable-speed electric drive axle has poor active adjustment of motor operation and low motor operation efficiency due to its own structural problems, resulting in high power consumption of the entire vehicle. Summary of the invention

[0004] The purpose of the present invention is to provide a four-speed automatic transmission bridge for electric vehicles, which has the characteristics of wide speed ratio range, economical and high reliability, compact structure and space saving.

[0005] The technical solution adopted by the present invention is a four-speed automatic transmission bridge for electric vehicles, comprising a drive motor, a transmission and a differential;

[0006] The transmission consists of an input shaft, a secondary shaft, a shift shaft, a main shaft, an intermediate shaft, five sets of meshing gear pairs and two sets of shift actuators.

[0007] The driving motor is connected to the driving wheel of the first gear pair through the input shaft, the driving wheel of the second gear pair and the driven wheel of the first gear pair are coaxially arranged on two shafts, and the input shaft and the two shafts are arranged in parallel;

[0008] The driven wheel of the second gear pair and the driven wheel of the third gear pair are supported by bearings and are coaxially sleeved on the shift shaft; the second shaft and the shift shaft are arranged in parallel;

[0009] The first coupling sleeve is arranged on the shift shaft and is located between the driven gear of the second gear pair and the driven gear of the third gear pair. The coupling tooth A is connected to the driven gear of the second gear pair and is arranged on one side of the first coupling sleeve. The coupling tooth B is connected to the driven gear of the third gear pair and is arranged on the other side of the first coupling sleeve.

[0010] The driving wheel of the fourth gear pair is arranged on the shifting shaft. The driven wheel of the fifth gear pair is supported by bearings and is sleeved on the main shaft in an idle state. The shifting shaft and the main shaft are coaxially arranged. The second engaging sleeve is arranged on the main shaft. The engaging tooth C is arranged on the shifting shaft between the driving wheel of the fourth gear pair and the second engaging sleeve. The engaging tooth D is arranged on the main shaft, between the second engaging sleeve and the driven wheel of the fifth gear pair and is connected to the driven wheel of the fifth gear pair. The driven wheel of the fourth gear pair and the driving wheel of the fifth gear pair are coaxially arranged on the intermediate shaft. The intermediate shaft and the main shaft are arranged in parallel;

[0011] The driving wheel of the sixth gear pair is arranged on the main shaft, and the driven wheel of the sixth gear pair is arranged on the output shaft of the differential.

[0012] The driving motor and the driving wheel of the first gear pair are coaxially arranged.

[0013] 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.

[0014] A driving method of a four-speed automatic transmission for an electric vehicle makes the first engaging sleeve engage with the engaging tooth A, and the second engaging sleeve engage with the engaging tooth D; the second gear pair and the fifth gear pair transmit power. The input power is transmitted to the reducer through the first gear pair, the second gear pair, the fourth gear pair and the fifth gear pair, and the power is output through the differential.

[0015] In one embodiment, the first engaging sleeve engages with the engaging tooth A, and the second engaging sleeve engages with the engaging tooth C; the second gear pair transmits power. The input power is transmitted to the reducer through the first gear pair and the second gear pair, and the power is output through the differential.

[0016] In one embodiment, the first engaging sleeve engages with the engaging tooth B, and the second engaging sleeve engages with the engaging tooth C; the third gear pair transmits power. The input power is transmitted to the reducer through the first gear pair and the third gear pair, and the power is output through the differential.

[0017] In one embodiment, the first engaging sleeve engages with the engaging tooth B, and the second engaging sleeve engages with the engaging tooth D; the third gear pair and the fifth gear pair transmit power. The input power is transmitted to the reducer through the first gear pair, the third gear pair, the fourth gear pair and the fifth gear pair, and the power is output through the differential.

[0018] The beneficial effects of the present invention are:

[0019] 1. This patent adopts a parallel arrangement of the motor and the electric drive axle system, with a short transmission route, small axial dimension, compact structure and light weight;

[0020] 2. This patent adopts a multi-stage transmission with an optimized layout, effectively balancing the requirements of structural design and the maximization of bearing life, and the power performance is continuous and reliable;

[0021] 3. This patent adopts a four-speed transmission structure with a transverse double-segment single intermediate shaft, which has the advantage of a wide speed ratio range, effectively shortens the axial width of the transmission system, and improves the layout adaptability of the whole vehicle. Brief Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the connection of each component of the four-speed automatic transmission bridge for electric vehicles of the present invention;

[0023] Figure 2 It is a power transmission route diagram of the present invention under Condition 1;

[0024] Figure 3 It is a power transmission route diagram of the present invention under Condition 2;

[0025] Figure 4 It is a power transmission route diagram of the present invention under Condition 3;

[0026] Figure 5 It is a power transmission route diagram of the present invention under Condition 4.

[0027] In the figure, 1. driving motor, 2. input shaft, 3. first gear pair, 4. second shaft, 5. second gear pair, 6. shift shaft, 7. engaging tooth A, 8. first engaging sleeve, 9. engaging tooth B, 10. fourth gear pair, 11. intermediate shaft, 12. engaging tooth C, 13. second engaging sleeve, 14. fifth gear pair, 15. differential, 16. sixth gear pair, 17. main shaft, 18. engaging tooth D, 19. third gear pair. Detailed Description of the Invention

[0028] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0029] As Figure 1 shown: A four-speed automatic transmission bridge for electric vehicles includes a driving motor 1, a transmission, and a differential 15.

[0030] The transmission consists of: an input shaft 2, a second shaft 4, a shift shaft 6, a main shaft 17, an intermediate shaft 11, five sets of meshing gear pairs, and two sets of shift actuators.

[0031] The driving motor 1 is connected to the driving wheel of the first gear pair 3 through the input shaft 2. The driving wheel 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;

[0032] The driven wheel of the second gear pair 5 and the driven wheel of the third gear pair 19 are supported by bearings and are coaxially sleeved on the shift shaft 6; the second shaft 4 and the shift shaft 6 are arranged in parallel.

[0033] The first clutch sleeve 8 is arranged on the shift shaft 6 and is located between the driven wheel of the second gear pair 5 and the driven wheel of the third gear pair 19. The engaging teeth A7 are connected to the driven wheel of the second gear pair 5 and are arranged on one side of the first clutch sleeve 8, and the engaging teeth B9 are connected to the driven wheel of the third gear pair 19 and are arranged on the other side of the first clutch sleeve 8.

[0034] The driving wheel of the fourth gear pair 10 is arranged on the shift shaft 6. The driven wheel of the fifth gear pair 14 is supported by a bearing and is sleeved on the main shaft 17 coaxially. The shift shaft 6 and the main shaft 17 are arranged coaxially. The second clutch sleeve 13 is arranged on the main shaft 17. The engaging teeth C12 are arranged on the shift shaft 6 between the driving wheel of the fourth gear pair 10 and the second clutch sleeve 13. The engaging teeth D18 are arranged on the main shaft 17, between the second clutch sleeve 13 and the driven wheel of the fifth gear pair 14 and are connected to the driven wheel of the fifth gear pair 14. The driven wheel of the fourth gear pair 10 and the driving wheel of the fifth gear pair 14 are arranged coaxially on the countershaft 11. The countershaft 11 and the main shaft 17 are arranged in parallel.

[0035] The driving wheel of the sixth gear pair 16 is arranged on the main shaft 17, and the driven wheel of the sixth gear pair 16 is arranged on the output shaft of the differential 15.

[0036] The first set of shift actuating mechanism: The first clutch sleeve 8 is arranged on the shift shaft 6, between the engaging teeth A7 and the engaging teeth B9. The engaging teeth A7 are connected to the driven wheel of the second gear pair 5, and the engaging teeth B9 are connected to the driven wheel of the third gear pair 19.

[0037] The second set of shift actuating mechanism: The second clutch sleeve 13 is arranged on the main shaft 17, between the engaging teeth C12 and the engaging teeth D18. The engaging teeth C12 are arranged at the end of the shift shaft 6, and the engaging teeth D18 are connected to the driven wheel of the fifth gear pair 14.

[0038] The driving motor 1 and the driving wheel of the first gear pair 3 are coaxially arranged.

[0039] The first gear pair 3, the second gear pair 5, the third gear pair 19, the fourth gear pair 10, the fifth gear pair 14 and the sixth gear pair 16 are all external meshing gear pairs, and the gears are all helical cylindrical gears.

[0040] As Figure 2As shown, the first engaging sleeve 8 is engaged with the engaging teeth A7, and the second engaging sleeve 13 is engaged with the engaging teeth D18; the second gear pair 5 and the fifth gear pair 14 transmit power. The input power is transmitted to the reducer through the first gear pair 3, the second gear pair 5, the fourth gear pair 10 and the fifth gear pair 14, and the power is output through the differential 15 to achieve four-speed transmission.

[0041] As Figure 3 shown, the first engaging sleeve 8 is engaged with the engaging teeth A7, and the second engaging sleeve 13 is engaged with the engaging teeth C12; the second gear pair 5 transmits power. The input power is transmitted to the reducer through the first gear pair 3 and the second gear pair 5, and the power is output through the differential 15 to achieve two-speed transmission.

[0042] As Figure 4 shown, the first engaging sleeve 8 is engaged with the engaging teeth B9, and the second engaging sleeve 13 is engaged with the engaging teeth C12; the third gear pair 19 transmits power. The input power is transmitted to the reducer through the first gear pair 3 and the third gear pair 19, and the power is output through the differential 15 to achieve two-speed transmission.

[0043] As Figure 5 shown, the first engaging sleeve 8 is engaged with the engaging teeth B9, and the second engaging sleeve 13 is engaged with the engaging teeth D18; the third gear pair 19 and the fifth gear pair 14 transmit power. The input power is transmitted to the reducer through the first gear pair 3, the third gear pair 19, the fourth gear pair 10 and the fifth gear pair 14, and the power is output through the differential 15 to achieve four-speed transmission.

Claims

1. A four-speed automatic transmission bridge for an electric vehicle, comprising a driving motor (1), a transmission, and a differential (15), the driving motor (1) is connected to the transmission, and the transmission is connected to the differential (15); 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). 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 (19) are supported by bearings and are coaxially sleeved on the shift shaft (6). The secondary shaft (4) and the shift shaft (6) are arranged in parallel. The first clutch sleeve (8) is arranged on the shift shaft (6) and is located between the driven wheel of the second gear pair (5) and the driven wheel of the third gear pair (19). The engaging teeth A (7) are connected to the driven wheel of the second gear pair (5) and are arranged on one side of the first clutch sleeve (8). The engaging teeth B (9) are connected to the driven wheel of the third gear pair (19) and are arranged on the other side of the first clutch sleeve (8). The driving wheel of the fourth gear pair (10) is arranged on the shift shaft (6). The driven wheel of the fifth gear pair (14) is supported by a bearing and is sleeved on the main shaft (17) coaxially. The shift shaft (6) and the main shaft (17) are arranged coaxially. The second clutch sleeve (13) is arranged on the main shaft (17). The engaging teeth C (12) are arranged on the shift shaft (6) between the driving wheel of the fourth gear pair (10) and the second clutch sleeve (13). The engaging teeth D (18) are arranged on the main shaft (17) between the second clutch sleeve (13) and the driven wheel of the fifth gear pair (14) and are connected to the driven wheel of the fifth gear pair (14). The driven wheel of the fourth gear pair (10) and the driving wheel of the fifth gear pair (14) are coaxially arranged on the countershaft (11). The countershaft (11) and the main shaft (17) are arranged in parallel. The driving wheel of the sixth gear pair (16) is arranged on the main shaft (17), and the driven wheel of the sixth gear pair (16) is arranged on the output shaft of the differential (15).

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. A four-speed automatic transmission bridge for an electric vehicle according to claim 1, characterized in that, The first gear pair (3), the second gear pair (5), the third gear pair (19), the fourth gear pair (10), the fifth gear pair (14) and the sixth gear pair (16) 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 clutch sleeve (8) engages with the engaging teeth A (7), and the second clutch sleeve (13) engages with the engaging teeth D (18). The second gear pair (5) and the fifth gear pair (14) transmit power. The input power is transmitted to the reducer through the first gear pair (3), the second gear pair (5), the fourth gear pair (10) and the fifth gear pair (14), and the power is output through the differential (15).

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 clutch sleeve (8) engages with the engaging teeth A (7), and the second clutch sleeve (13) engages with the engaging teeth C (12). The second gear pair (5) transmits power. The input power is transmitted to the reducer through the first gear pair (3) and the second gear pair (5), and the power is output through the differential (15).

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 teeth B (9), and the second engaging sleeve (13) is engaged with the engaging teeth C (12); the third gear pair (19) transmits power, and the input power is transmitted to the reducer through the first gear pair (3) and the third gear pair (19), and the power is output through the differential (15).

7. 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 teeth B (9), and the second engaging sleeve (13) is engaged with the engaging teeth D (18); the third gear pair (19) and the fifth gear pair (14) transmit power, and the input power is transmitted to the reducer through the first gear pair (3), the third gear pair (19), the fourth gear pair (10) and the fifth gear pair (14), and the power is output through the differential (15).

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