CN216886227U

CN216886227U - Two keep off coaxial electricity and drive system and vehicle

Info

Publication number: CN216886227U
Application number: CN202220725858.4U
Authority: CN
Inventors: 吴桂义; 占华龙; 鲁方俊; 胡腾; 周韬; 杨钰辉
Original assignee: Wuxi Zhongche Haofu Power Assembly Co ltd
Current assignee: Wuxi Zhongche Haofu Power Assembly Co ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-05
Anticipated expiration: 2032-03-30

Abstract

The utility model belongs to the technical field of electric automobile driving, and particularly relates to a two-gear coaxial electric driving system and a vehicle, which comprise a motor shell, a composite planet carrier and a duplex planet gear, wherein the composite planet carrier is provided with a planet gear supporting structure parallel to an axis, the duplex planet gear comprises a rotating shaft, a large gear and a small gear which are fixedly arranged on the rotating shaft, the rotating shaft is rotationally matched with the planet gear supporting structure, the duplex planet gear also comprises a large gear ring and a small gear ring which are rotationally arranged in the motor shell and are respectively engaged with the large gear and the small gear, and a first-gear brake and a second-gear brake which are fixedly arranged on the motor shell and are respectively correspondingly matched with the large gear ring and the small gear ring, the duplex planet gear is rotationally arranged on the composite planet carrier, good support is provided for the duplex planet gear, NVH performance of a gear shaft system is facilitated, and the diameter of the duplex planet gear can be smaller, the gear ratio is larger than that of a common planet wheel built-in needle bearing scheme in the industry under the same volume.

Description

Two keep off coaxial electricity and drive system and vehicle

Technical Field

The utility model belongs to the technical field of electric automobile driving, and particularly relates to a two-gear coaxial electric driving system and a vehicle.

Background

At present, increasingly serious environmental problems and energy crisis are emphasized by countries, and the market share of new energy automobiles is remarkably improved in order to achieve the aim of energy conservation and emission reduction.

Most of electric automobiles in the current market adopt a single-gear speed reducer with a fixed gear ratio, and although the rotating speed range and the torque of the motor which work efficiently are greatly improved compared with an internal combustion engine, the efficiency of the motor is obviously reduced when the rotating speed of the motor is higher. In order to optimize efficiency, improve power performance, improve cruising high-speed performance, and improve the NVH level of a power system by reducing the rotating speed of a motor, a coaxial electric drive system based on a duplex planetary gear is provided. However, the coaxial electric driving system of the present duplex planetary gear still has the problems that the structure is not compact enough, and the stability and the reliability are to be enhanced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a two-gear coaxial electric driving system and a vehicle, which are compact in structure, stable and reliable.

The double-planet gear comprises a rotating shaft, a large gear ring and a small gear ring which are rotatably arranged in the motor shell and are respectively meshed with the large gear and the small gear, and a first gear brake and a second gear brake which are fixedly arranged on the motor shell and are respectively correspondingly matched with the large gear ring and the small gear ring.

Furthermore, the planet wheel supporting structure and the duplex planet gear are provided with a plurality of groups in an annular array along the axis.

Furthermore, the planet wheel supporting structure comprises mounting holes in two side walls of the composite planet carrier and bearings arranged in the mounting holes, and the rotating shaft is in running fit with the composite planet carrier through the bearings.

Furthermore, bearing supports are arranged on two sides of the axis position of the composite planet carrier, and the composite planet carrier is rotatably arranged in the motor shell through the bearing supports.

Furthermore, the first gear brake and the second gear brake are integrated.

Further, the first gear brake and the second gear brake are arranged in parallel to the large ring gear and the small ring gear.

Furthermore, a rotating shaft mounting hole and a differential speed planet carrier are coaxially arranged on the composite planet carrier.

The utility model also comprises a motor arranged in the motor shell, and a rotor of the motor is connected with a motor gear meshed with the large gear or the small gear.

Furthermore, a hollow motor shaft is arranged on the rotor of the motor, and the motor gear is arranged on the hollow motor shaft.

Further, the hollow motor shaft is rotationally coupled to the motor housing through a bearing.

An electric vehicle includes a two-speed coaxial electric drive system.

The double-connection planetary gear transmission device has the beneficial effects that the double-connection planetary gear is combined with the two-gear brake to realize two speed ratios of power transmission, wherein the double-connection planetary gear is rotatably arranged on the composite planet carrier to provide good support for the double-connection planetary gear, so that the NVH performance of a gear shaft system is facilitated, the double-connection planetary gear is arranged on the composite planet carrier through the planetary gear support structures on two sides, the diameter of the double-connection planetary gear can be smaller, and the gear speed ratio is larger than that of a common planetary gear built-in needle roller bearing scheme in the industry under the same volume. The composite planet carrier is of a hollow frame structure, the composite planet carrier rotates and is arranged in the motor shell, the duplex planetary gears are arranged in the motor shell in a rotating mode, the structure of the composite planet carrier does not increase the energy consumption, the stability and the reliability of the structure are improved, the installation of the duplex planetary gears is facilitated, and the installation of the subsequent differential mechanism is facilitated.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of the compound planet carrier of the present invention.

In the figures, 1-half axis I; 2-motor bearing I; 3-a rotor; 4-motor bearing II; 5-a bull gear; 6-two-gear brake; 7-a rotating shaft mounting hole; 8-a compound planet carrier; 9-differential carrier; 10-pinion gear; 11-a small gear ring; 12-first gear brake; 13-big gear ring; 14-a planet wheel support structure; 15-half axis II; 16-differential planet gear; 17-a rotating shaft; 18-motor gear; 19-hollow motor shaft; 20-bearing support.

Detailed Description

As shown in fig. 1-2, the present invention includes a motor housing, a compound planet carrier 8 and a duplex planet gear, the compound planet carrier 8 is rotatably disposed in the motor housing, the compound planet carrier 8 is a hollow frame structure, a planet wheel supporting structure 14 is disposed on the compound planet carrier 8 in parallel with an axis, the duplex planet gear includes a rotating shaft 17, a large gear 5 and a small gear 10 fixedly disposed on the rotating shaft 17, the rotating shaft 17 is rotatably matched with the planet wheel supporting structure 14, the present invention further includes a large gear ring 13 and a small gear ring 11 rotatably disposed in the motor housing and respectively engaged with the large gear 5 and the small gear ring 10, and a first gear brake 12 and a second gear brake 6 fixedly disposed on the motor housing and respectively correspondingly engaged with the large gear ring 13 and the small gear ring 11.

According to the utility model, the duplex planetary gear is combined with the two-gear brake to realize two speed ratios of power transmission, wherein the duplex planetary gear is rotatably arranged on the composite planet carrier 8 to provide good support for the duplex planetary gear, so that the NVH performance of a gear shaft system is facilitated, the duplex planetary gear is arranged on the composite planet carrier 8 through the planetary gear supporting structures 14 on two sides, the diameter of the duplex planetary gear can be smaller, and the gear ratio is larger than that of a common planetary gear built-in needle roller bearing scheme in the industry under the same volume. The compound planet carrier 8 is a hollow frame structure, the compound planet carrier 8 rotates and is arranged in the motor shell, the duplex planetary gears are arranged in the motor shell in a rotating mode, the structure of the compound planet carrier 8 improves the stability and the reliability of the structure on the premise that the energy consumption is not increased, the installation of the duplex planetary gears is facilitated, and the installation of the subsequent differential mechanism is facilitated.

Planet wheel bearing structure 14 and pair planetary gear are the annular array along the axis and are provided with the multiunit, and the quantity of planet wheel bearing structure 14 is corresponding with the quantity of pair planetary gear to support in the both sides of pair planetary gear, its quantity is circumference evenly distributed, consequently for pair planetary gear provides good support, do benefit to gear shafting's NVH performance.

The planet wheel supporting structure 14 is the mounting hole on the both sides wall of the composite planet carrier 8 and the bearing arranged in the mounting hole, the rotating shaft 17 is in running fit with the composite planet carrier 8 through the bearing, the mounting hole and the rotating shaft 17 are matched through the bearing, the rotating damping is small, and the structure is stable and reliable.

Bearing supports 20 are arranged on two sides of the axis position of the composite planet carrier 8, the composite planet carrier 8 is rotationally arranged in the motor shell through the bearing supports 20, the matching of the motor shell and the composite planet carrier 8 is completed through the bearing supports 20, the rotational damping is small, and the structure is stable and reliable.

The first gear brake 12 and the second gear brake 6 are integrated, so that the manufacturing cost of the brakes can be reduced, and the space utilization rate can be increased.

The first-gear brake 12 and the second-gear brake 6 are arranged parallel to the large ring gear 13 and the small ring gear 11, reducing the radial dimension.

The coaxial pivot mounting hole 7 and the differential planet carrier 9 that are provided with on the compound planet carrier 8, differential mechanism planetary gear 16 arranges in the differential planet carrier 9, and is located the center of compound planet carrier 8, reduces and drives system axial dimension by electricity.

The utility model also comprises a motor arranged in the motor shell, and a rotor 3 of the motor is connected with a motor gear 18 meshed with the large gear 5 or the small gear 10 and used for transmitting power.

The rotor 3 of the motor is provided with a hollow motor shaft 19, the motor gear 18 is arranged on the hollow motor shaft 19 and penetrates through the hollow motor shaft 19 together with a half shaft I1 of the differential planetary gear, and the other half shaft II 15 is arranged on the composite planet carrier 8.

The hollow motor shaft 19 is in running fit with the motor shell through a bearing, specifically a motor bearing I2 and a motor bearing II 4 shown in figure 1.

An electric vehicle includes a two-speed coaxial electric drive system.

The two-gear action transmission of the utility model:

first gear: the first gear brake 12 brakes, the second gear brake 6 disengages, and the small gear ring 11 remains stationary relative to the motor housing. Power transmission path: the motor rotor 3 → the hollow motor shaft 19 → the motor gear 18 → the large gear 5 → the small gear 10 → the compound carrier 8 → the differential planetary gear 16 → the half shaft i 1 and the half shaft ii 15 of the electric drive system.

And (2) second: the first gear brake 12 is disengaged, the second gear brake 6 is braked, and the large gear ring 13 is kept static relative to the motor housing. Power transmission path: the motor rotor 3 → the hollow motor shaft 19 → the motor gear 18 → the large gear 5 → the compound carrier 8 → the differential planetary gear 16 → the half shaft i 1 and the half shaft ii 15 of the electric drive system.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to imply that the scope of the application is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments in the present application as described above, which are not provided in detail for the sake of brevity.

It is intended that the one or more embodiments of the present application cover all such alternatives, modifications, and variations as fall within the broad scope of the present application. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present application are intended to be included within the scope of the present application.

Claims

1. A two-gear coaxial electric drive system is characterized by comprising a motor shell, a composite planet carrier (8) and a duplex planetary gear, wherein the composite planet carrier (8) is rotatably arranged in the motor shell, the composite planet carrier (8) is of a hollow frame structure, a planet wheel supporting structure (14) is arranged on the composite planet carrier (8) in parallel to an axis, the duplex planetary gear comprises a rotating shaft (17), a large gear (5) and a small gear (10) which are fixedly arranged on the rotating shaft (17), the rotating shaft (17) is in rotating fit with the planet wheel supporting structure (14), and the two-gear coaxial electric drive system also comprises a large gear ring (13) and a small gear ring (11) which are rotatably arranged in the motor shell and are respectively meshed with the large gear (5) and the small gear (10), and a first gear brake (12) and a second gear brake (6) which are fixedly arranged on the motor shell and are respectively correspondingly matched with the large gear ring (13) and the small gear ring (11).

2. Two-gear coaxial electric drive system according to claim 1, characterized in that the planet wheel support structure (14) and the double planetary gear are arranged in groups along the axis in an annular array.

3. Two-gear coaxial electric drive system according to claim 1, characterized in that the planet wheel support structure (14) is a mounting hole in both side walls of the compound planet carrier (8) and a bearing arranged in the mounting hole, and the rotating shaft (17) is in rotating fit with the compound planet carrier (8) through the bearing.

4. Two-gear coaxial electric drive system according to claim 1, characterized in that the compound planet carrier (8) is provided with bearing supports (20) on both sides of its axial position, the compound planet carrier (8) being rotatably arranged in the motor housing by means of the bearing supports (20).

5. Two-gear coaxial electric drive system according to any one of claims 1 to 4, characterized in that the first gear brake (12) and the second gear brake (6) are integrated.

6. Two-gear coaxial electric drive system according to claim 5, characterized in that the first gear brake (12) and the second gear brake (6) are arranged parallel to the large toothed ring (13) and the small toothed ring (11).

7. Two-gear coaxial electric drive system according to any one of claims 1 to 4, characterized in that the compound planet carrier (8) is provided coaxially with the shaft mounting hole (7) and the differential planet carrier (9).

8. Two-gear coaxial electric drive system according to any one of claims 1 to 4, further comprising an electric motor disposed in the motor housing, the rotor (3) of the electric motor being connected to a motor gear (18) which meshes with the gearwheel (5) or the pinion (10).

9. Two-gear coaxial electric drive system according to claim 8, characterized in that the rotor (3) of the electric machine is provided with a hollow motor shaft (19), the motor gear (18) being provided on the hollow motor shaft (19), the hollow motor shaft (19) being in a rotating fit with the motor housing via a bearing.

10. An electric vehicle comprising a two-speed coaxial electric drive system according to any of claims 1-9.