Reduction gear assembly, electric drive axle and vehicle

Abstract

The application provides a reducer assembly, an electric drive axle and a vehicle, the reducer assembly comprising an input shaft, a first gear reduction mechanism, a second gear reduction mechanism, a shift shaft, a shift mechanism, a one-way clutch and an output shaft, the input shaft being drivingly connected to the shift shaft through the first gear reduction mechanism or the second gear reduction mechanism, the one-way clutch being arranged on the shift shaft and being in mounting connection with the first gear reduction mechanism, the input shaft being drivingly connected to the shift shaft through the first gear reduction mechanism, the shift mechanism being in sliding connection with the shift shaft, the shift mechanism being capable of sliding along the axial direction of the shift shaft to change the speed ratio of the second gear reduction mechanism, and the output shaft being in driving connection with the shift shaft and being used for transmitting power to external equipment.In the reducer assembly, the electric drive axle and the vehicle, the one-way clutch is adopted, and through the overrunning function of the one-way clutch, the switching of three gears can be realized through one shift mechanism and one one-way clutch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a reducer assembly, an electric drive axle and a vehicle. BACKGROUND

[0002] At present, electric drive vehicles are becoming more and more popular. A multi-gear transmission can meet the requirements of maximum speed and climbing degree, and has good economy, which is the trend of current technology development. At present, the multi-gear transmission mainly changes the speed ratio of the meshing gear through a shift actuator to realize the switching of gears, and the power interruption during shifting is mainly realized through multiple power sources or friction clutches. However, the multi-gear transmission in the prior art realizes multi-gear shifting through multiple shift sleeves, which causes the volume of the transmission to increase, the cost to increase, and the power interruption during shifting. SUMMARY

[0003] The purpose of the present application is to provide a reducer assembly, an electric drive axle and a vehicle to solve the problems of large volume and high cost of the existing transmission and power interruption during shifting.

[0004] The present application provides a reducer assembly, comprising an input shaft, a first gear reduction mechanism, a second gear reduction mechanism, a shift shaft, a shift mechanism, a one-way clutch and an output shaft, the input shaft is drivingly connected to the shift shaft through the first gear reduction mechanism or the second gear reduction mechanism, the one-way clutch is arranged on the shift shaft and is mounted and connected with the first gear reduction mechanism, so that the input shaft is drivingly connected to the shift shaft through the first gear reduction mechanism, the shift mechanism is slidingly connected to the shift shaft, the shift mechanism can slide along the axial direction of the shift shaft to change the speed ratio of the second gear reduction mechanism, and the output shaft is drivingly connected with the shift shaft for transmitting power to external equipment.

[0005] In an embodiment of the present application, the first gear reduction mechanism comprises an input driving gear, a driven shaft, a first gear and a second gear, the input driving gear is coaxially fixedly connected with the input shaft, the first gear is coaxially fixedly connected with the driven shaft, the first gear is engaged with the second gear, the input driving gear is engaged with the first gear, and the second gear is coaxially arranged on the shift shaft and mounted on the one-way clutch.

[0006] In an embodiment of the present application, the second gear reduction mechanism comprises a first gear reduction assembly and a second gear reduction assembly, the first gear reduction assembly and the second gear reduction assembly have different speed ratios, the shift mechanism is movably connected to the shift shaft along the axial direction of the shift shaft, and is connected to the first gear reduction assembly or the second gear reduction assembly to achieve different speed ratios.

[0007] In an embodiment of the present application, the first gear reduction assembly comprises a third gear and a fourth gear, the third gear is coaxially fixedly connected to the driven shaft, the fourth gear is coaxially arranged on the shift shaft, and the third gear and the fourth gear are engaged; the second gear reduction assembly comprises a fifth gear and a sixth gear, the fifth gear is coaxially fixedly connected to the driven shaft, the sixth gear is coaxially arranged on the shift shaft, and the fifth gear and the sixth gear are engaged.

[0008] In an embodiment of the present application, the input shaft, the driven shaft, the shift shaft and the output shaft are arranged in parallel with each other.

[0009] In an embodiment of the present application, the ratio of the number of teeth of the first gear to the number of teeth of the second gear is greater than the ratio of the number of teeth of the third gear to the number of teeth of the fourth gear, and the ratio of the number of teeth of the third gear to the number of teeth of the fourth gear is greater than the ratio of the number of teeth of the fifth gear to the number of teeth of the sixth gear; the number of teeth of the first gear is less than the number of teeth of the second gear, the number of teeth of the third gear is less than the number of teeth of the fourth gear, and the number of teeth of the fifth gear is less than the number of teeth of the sixth gear.

[0010] In an embodiment of the present application, the reducer assembly further comprises a transmission driving gear and a transmission driven gear, the transmission driving gear is coaxially fixedly connected to the shift shaft, the transmission driven gear is coaxially fixedly connected to the output shaft, and the transmission driving gear and the transmission driven gear are engaged.

[0011] In an embodiment of the present application, the reducer assembly further comprises a differential, the differential has the transmission driven gear arranged on the housing of the differential, and the differential is coaxially fixedly connected to the transmission driven gear.

[0012] The present application further provides an electric drive axle, comprising an axle housing and the reducer assembly as described above, the reducer assembly is arranged in the axle housing; the electric drive axle further comprises a driving motor, and the driving motor is in transmission connection with the input shaft.

[0013] The present application further provides a vehicle comprising the electric drive axle as described above.

[0014] In the speed reducer assembly, the electric drive axle and the vehicle of the present application, a one-way clutch is adopted, through the overrun of the one-way clutch, three gear positions can be switched through one shift mechanism and one one-way clutch; at the same time, the power will not be interrupted through the action of the one-way clutch during the switching of the shift mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a structural diagram of a speed reducer assembly of an embodiment of the present application.

[0016] Figure 2 The figure is a structural diagram of a speed reducer assembly of another embodiment of the present application. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0018] The present application provides a speed reducer assembly, as shown in the figure, an embodiment of the speed reducer assembly includes an input shaft 11, a first gear reduction mechanism, a second gear reduction mechanism, a shift shaft 12, a shift mechanism 13, a one-way clutch 14 and an output shaft 15, the input shaft 11 is drivingly connected to the shift shaft 12 through the first gear reduction mechanism or the second gear reduction mechanism, the one-way clutch 14 is arranged on the shift shaft 12 and is mounted with the first gear reduction mechanism, so that the input shaft 11 is drivingly connected to the shift shaft 12 through the first gear reduction mechanism, the shift mechanism 13 is slidingly connected to the shift shaft 12, the shift mechanism 13 can slide along the axial direction of the shift shaft 12 to change the speed ratio of the second gear reduction mechanism, the output shaft 15 is drivingly connected with the shift shaft 12, for transmitting power to external equipment. Figure 1 In the speed reducer assembly of the present application, a one-way clutch 14 is adopted, through the overrun of the one-way clutch 14, three gear positions can be switched through one shift mechanism 13 and one one-way clutch 14; at the same time, the power will not be interrupted through the action of the one-way clutch 14 during the switching of the shift mechanism 13.

[0019]

[0020] ​In the embodiment, the first gear reduction mechanism includes an input driving gear 16, a driven shaft 17, a first gear 18 and a second gear 19. The input driving gear 16 is coaxially fixedly connected with the input shaft 11. The first gear 18 is coaxially fixedly connected with the driven shaft 17. The first gear 18 is engaged with the second gear 19. The input driving gear 16 is engaged with the first gear 18. The second gear 19 is coaxially arranged on the shift shaft 12. The second gear 19 is mounted on the one-way clutch 14. The input shaft 11 is driven to rotate, thereby driving the input driving gear 16 on the input shaft 11 to rotate synchronously. The input driving gear 16 is engaged with the first gear 18, thereby driving the first gear 18 to rotate. The first gear 18 is engaged with the second gear 19, thereby driving the second gear 19 to rotate. The one-way clutch 14 is in the engaged state at this time, thereby allowing the torque to be transmitted to the driven shaft 17 (the shaft 12).

[0021] In the embodiment, the second gear reduction mechanism includes a first gear reduction assembly and a second gear reduction assembly. The speed ratios of the first gear reduction assembly and the second gear reduction assembly are different. The shift mechanism 13 is movably connected with the shift shaft 12 along the axial direction of the shift shaft 12. The shift mechanism 13 is connected with the first gear reduction assembly or the second gear reduction assembly, thereby achieving different speed ratios (transmission ratios).

[0022] Specifically, the first gear reduction assembly includes a third gear 21 and a fourth gear 22. The third gear 21 is coaxially fixedly connected with the driven shaft 17. The fourth gear 22 is coaxially arranged on the shift shaft 12. The third gear 21 is engaged with the fourth gear 22. The second gear reduction assembly includes a fifth gear 23 and a sixth gear 24. The fifth gear 23 is coaxially fixedly connected with the driven shaft 17. The sixth gear is coaxially arranged on the shift shaft 12. The fifth gear 23 is engaged with the sixth gear 24. When the shift mechanism 13 is combined with the fourth gear 22, the power transmission route is input shaft→input driving gear 16→first gear 18→driven shaft 17→third gear 21→fourth gear 22→shift shaft 12→output shaft 15. When the shift mechanism 13 is combined with the sixth gear 24, the power transmission route is input shaft→input driving gear 16→first gear 18→driven shaft 17→fifth gear 23→sixth gear 24→shift shaft 12→output shaft 15. During the combination of the shift mechanism 13 with the fourth gear 22 and the sixth gear 24, the one-way clutch 14 plays a function of overrun. The one-way clutch 14 is free to rotate, thereby allowing the power to be transmitted without friction. The power output is not interrupted, thereby ensuring the smoothness of the shift process and the reliability of the system.

[0023] In another preferred embodiment, the input driving gear 16 can be arranged to engage with the third gear 21 or the fifth gear 23. As shown in the figure Figure 2 In this embodiment, the input driving gear 16 is arranged to engage with the fifth gear 23.

[0024] In this embodiment, the shift mechanism 13 can be a sliding sleeve or a synchronizer / sleeve shift.

[0025] In this embodiment, the one-way clutch 14 can be any one of a roller overrunning clutch or a sprag overrunning clutch.

[0026] In this embodiment, the input driving gear 16 directly engages with the gear without the need of a driven shaft on the driven shaft 17, thus reducing the number of gears, achieving a three-stage reduction with only nine gears, reducing the cost and the overall space requirement of the reducer assembly.

[0027] In this embodiment, the input shaft 11, the driven shaft 17, the shift shaft 12 and the output shaft 15 are arranged in parallel to each other, which can reduce the space requirement, make the entire reducer assembly more compact, make the connection and disassembly of the components more convenient, reduce the difficulty of assembly and maintenance, and also reduce the friction loss between the bearings and the gears, thus improving the transmission efficiency of the system.

[0028] In this embodiment, the ratio of the number of teeth of the first gear 18 to the second gear 19 is greater than the ratio of the number of teeth of the third gear 21 to the fourth gear 22, and the ratio of the number of teeth of the third gear 21 to the fourth gear 22 is greater than the ratio of the number of teeth of the fifth gear 23 to the sixth gear 24; the number of teeth of the first gear 18 is less than the number of teeth of the second gear 19, the number of teeth of the third gear 21 is less than the number of teeth of the fourth gear 22, and the number of teeth of the fifth gear 23 is less than the number of teeth of the sixth gear 24.

[0029] It can be understood that the transmission ratio of the first gear 18 to the second gear 19 is greater than the transmission ratio of the third gear 21 to the fourth gear, and the transmission ratio of the third gear 21 to the fourth gear is greater than the transmission ratio of the fifth gear 23 to the sixth gear 24. The first gear is for power transmission from the first gear 18 to the second gear 19, the second gear is for power transmission from the third gear 21 to the fourth gear 22, and the third gear is for power transmission from the fifth gear 23 to the sixth gear 24; and the torque output of the first gear is the smallest, and the torque output of the third gear is the largest.

[0030] In the embodiment, the reducer assembly further comprises a transmission driving gear 25 and a transmission driven gear 26, the transmission driving gear 25 is coaxially fixedly connected to the shift shaft 12, the transmission driven gear 26 is coaxially fixedly connected to the output shaft 15, and the transmission driving gear 25 is engaged with the transmission driven gear 26.

[0031] The reducer assembly comprises three-stage reduction structure. Specifically, taking the first gear position as an example, the input driving gear 16 on the input shaft 11 is engaged with the first gear position gear 18 on the driven shaft 17 to achieve the first-stage reduction; the first gear position gear 18 on the driven shaft 17 is engaged with the second gear position gear 19 on the shift shaft 12 to achieve the second-stage reduction; the transmission driving gear 25 on the driven shaft 17 is engaged with the transmission driven gear 26 on the output shaft 15 to achieve the third-stage reduction. The nine gears used in the whole reducer assembly achieve three-gear three-stage reduction, which reduces the cost and the space requirement of the whole reducer assembly.

[0032] In the embodiment, the reducer assembly further comprises a differential 27, the differential 27 is coaxially fixedly connected with the transmission driven gear 26.

[0033] In the embodiment, the multi-gear power transmission routes of the reducer assembly are as follows:

[0034] The first gear position (the shift mechanism 13 is not combined with either one of the fourth gear position gear 22 and the sixth gear position gear 24): the driving motor 30 → the input shaft → the input driving gear 16 → the first gear position gear 18 → the driven shaft 17 → the first gear position gear 18 → the second gear position gear 19 → the shift shaft 12 → the transmission driving gear 25 → the transmission driven gear 26 → the differential 27 → the output shaft 15.

[0035] The second gear position (the shift mechanism 13 is combined with the fourth gear position gear 22): the driving motor 30 → the input shaft → the input driving gear 16 → the first gear position gear 18 → the driven shaft 17 → the third gear position gear 21 → the fourth gear position gear 22 → the shift shaft 12 → the transmission driving gear 25 → the transmission driven gear 26 → the differential 27 → the output shaft 15.

[0036] The third gear position (the shift mechanism 13 is combined with the sixth gear position gear 24): the driving motor 30 → the input shaft → the input driving gear 16 → the first gear position gear 18 → the driven shaft 17 → the fifth gear position gear 23 → the sixth gear position gear 24 → the shift shaft 12 → the transmission driving gear 25 → the transmission driven gear 26 → the differential 27 → the output shaft 15.

[0037] The application further provides an electric drive axle, comprising an axle housing and the speed reducer assembly as described above, the speed reducer assembly being arranged in the axle housing; the electric drive axle further comprises a drive motor 30, the drive motor 30 being in transmission connection with the input shaft 11.

[0038] The application further provides a vehicle, comprising the electric drive axle as described above. The vehicle can be a new energy vehicle, or any other vehicle type. It should be noted that other functional configurations of the vehicle are not the core of the application, and those skilled in the art can realize them based on the prior art, so this specification will not be described again.

[0039] In this document, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0040] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of expressing the technical solution clearly and conveniently, and therefore cannot be understood as a limitation on the application.

[0041] In this document, the terms "including", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0042] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A speed reducer assembly, characterized in that, The system includes an input shaft (11), a first gear reduction mechanism, a second gear reduction mechanism, a shift shaft (12), a shift mechanism (13), a one-way clutch (14), and an output shaft (15). The input shaft (11) is driven to the shift shaft (12) through the first gear reduction mechanism or the second gear reduction mechanism. The one-way clutch (14) is mounted on the shift shaft (12) and connected to the first gear reduction mechanism, enabling the input shaft (11) to be driven to the shift shaft (12) through the first gear reduction mechanism. The shift mechanism (13) is slidably connected to the shift shaft (12) and can slide along the axial direction of the shift shaft (12) to change the speed ratio of the second gear reduction mechanism. The output shaft (15) is driven to the shift shaft (12) and is used to transmit power to external equipment. During the shifting process, the shift mechanism (13) performs an overtaking function through the one-way clutch (14), allowing frictionless power transmission without interruption.

2. The reducer assembly according to claim 1, characterized in that, The first gear reduction mechanism includes an input drive gear (16), a driven shaft (17), a first gear (18), and a second gear (19). The input drive gear (16) is coaxially and fixedly connected to the input shaft (11). The first gear (18) is coaxially and fixedly connected to the driven shaft (17). The first gear (18) meshes with the second gear (19). The input drive gear (16) meshes with the first gear (18). The second gear (19) is coaxially disposed on the shift shaft (12) and mounted on the one-way clutch (14).

3. The reducer assembly according to claim 2, characterized in that, The second gear reduction mechanism includes a first gear reduction assembly and a second gear reduction assembly. The first gear reduction assembly and the second gear reduction assembly have different speed ratios. The shift mechanism (13) is movably connected to the shift shaft (12) along the axial direction of the shift shaft (12) and is connected to the first gear reduction assembly or the second gear reduction assembly to achieve different speed ratios.

4. The reducer assembly according to claim 3, characterized in that, The first gear reduction assembly includes a third gear (21) and a fourth gear (22). The third gear (21) is coaxially fixedly connected to the driven shaft (17), and the fourth gear (22) is coaxially disposed on the shift shaft (12). The third gear (21) and the fourth gear (22) mesh with each other. The second gear reduction assembly includes a fifth gear (23) and a sixth gear (24). The fifth gear (23) is coaxially fixedly connected to the driven shaft (17), and the sixth gear (24) is coaxially disposed on the shift shaft (12). The fifth gear (23) and the sixth gear (24) mesh with each other.

5. The reducer assembly according to claim 4, characterized in that, The input shaft (11), the driven shaft (17), the shift shaft (12), and the output shaft (15) are arranged parallel to each other.

6. The reducer assembly according to claim 4, characterized in that, The ratio of the number of teeth of the first gear (18) to the number of teeth of the second gear (19) is greater than the ratio of the number of teeth of the third gear (21) to the number of teeth of the fourth gear (22), and the ratio of the number of teeth of the third gear (21) to the number of teeth of the fourth gear (22) is greater than the ratio of the number of teeth of the fifth gear (23) to the number of teeth of the sixth gear (24); the number of teeth of the first gear (18) is less than the number of teeth of the second gear (19), the number of teeth of the third gear (21) is less than the number of teeth of the fourth gear (22), and the number of teeth of the fifth gear (23) is less than the number of teeth of the sixth gear (24).

7. The reducer assembly according to claim 1, characterized in that, The reducer assembly also includes a drive gear (25) and a driven gear (26). The drive gear (25) is coaxially fixedly connected to the shift shaft (12), and the driven gear (26) is coaxially fixedly connected to the output shaft (15). The drive gear (25) and the driven gear (26) mesh with each other.

8. The reducer assembly according to claim 7, characterized in that, The reducer assembly also includes a differential (27), on which the driven gear (26) is provided, and the differential (27) and the driven gear (26) are coaxially and fixedly connected.

9. An electric drive bridge, characterized in that, The electric drive bridge includes a bridge housing and a reducer assembly as described in any one of claims 1 to 8, the reducer assembly being disposed within the bridge housing; the electric drive bridge further includes a drive motor (30), the drive motor (30) being drively connected to the input shaft (11).

10. A vehicle, characterized in that, Includes the electric drive bridge as described in claim 9.

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