Gear shifting apparatus, electric drive system, and new energy vehicle

Patent metadata

Field	Value
Publication number	US-11796052-B2
Application number	US-202217886022-A
Country	US
Kind code	B2
Filing date	Aug 11, 2022
Priority date	Aug 12, 2021
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A gear shifting apparatus in a new energy vehicle includes a primary power transmission unit, a secondary power transmission unit, an intermediate shaft, an intermediate shaft gear, a first clutch unit, a second clutch unit, and a third clutch unit. The intermediate shaft gear is fixedly sleeved on the intermediate shaft, and the first clutch unit is disposed between the intermediate shaft and the primary power transmission unit. The second clutch unit is disposed between the intermediate shaft and the secondary power transmission unit. The third clutch unit is disposed between the primary power transmission unit and the intermediate shaft gear.

First claim

What is claimed is:

1. A gear shifting apparatus, comprising:
a primary power transmission unit;
a secondary power transmission unit;
an intermediate shaft;
an intermediate shaft gear fixedly sleeved on the intermediate shaft;
a first clutch unit disposed between the intermediate shaft and the primary power transmission unit, wherein the first clutch unit is configured to achieve first power transmission between the primary power transmission unit and the intermediate shaft or break the first power transmission;
a second clutch unit disposed between the intermediate shaft and the secondary power transmission unit, wherein the second clutch unit is configured to achieve second power transmission between the secondary power transmission unit and the intermediate shaft or break the second power transmission; and
a third clutch unit disposed between the primary power transmission unit and the intermediate shaft gear,
wherein the third clutch unit is configured to achieve third power transmission between the primary power transmission unit and the intermediate shaft gear or break the third power transmission, and
wherein the gear shifting apparatus is configured to be in a self-locking state when the first clutch unit achieves the first power transmission, the second clutch unit achieves the second power transmission based on combining the second clutch unit with the intermediate shaft gear, and the third clutch unit achieves the third power transmission based on combining the third clutch unit with the intermediate shaft gear.

2. The gear shifting apparatus of claim 1 , wherein the gear-shifting apparatus is configured to be in a non-self-locking state when the first clutch unit achieves the first power transmission, the second clutch unit achieves the second power transmission, and the third clutch unit breaks the third power transmission.

3. The gear shifting apparatus of claim 1 , wherein the third clutch unit comprises:
a third clutch disposed between the intermediate shaft gear and the primary power transmission unit;
an actuator; and
an actuator connecting piece connected to the actuator,
wherein the actuator is configured to control the actuator connecting piece to achieve the third power transmission or to break the third power transmission.

4. The gear shifting apparatus of claim 1 , wherein the primary power transmission unit comprises:
a primary power transmission input gear; and
a primary power transmission output gear, wherein the primary power transmission output gear meshes with the primary power transmission input gear, wherein the first clutch unit is disposed between the primary power transmission output gear and the intermediate shaft, and wherein the third clutch is mounted between the primary power transmission output gear and the intermediate shaft gear.

5. The gear shifting apparatus of claim 4 , wherein the first clutch unit comprises a one-way clutch, and wherein the one-way clutch is mounted between the primary power transmission output gear and the intermediate shaft.

6. The gear shifting apparatus of claim 3 , wherein the third clutch is a toothed clutch, and wherein the actuator is configured to:
control the actuator connecting piece to move in a first axial direction of the intermediate shaft to cause the third clutch to mesh with the intermediate shaft gear and achieve the third power transmission; or
control the actuator connecting piece to move in a second axial direction of the intermediate shaft to cause the third clutch to separate from the intermediate shaft gear and break the third power transmission.

7. The gear shifting apparatus of claim 1 , wherein the secondary power transmission unit comprises:
a secondary power transmission input gear; and
a secondary power transmission output gear, wherein the secondary power transmission output gear meshes with the secondary power transmission input gear, and wherein the second clutch unit is disposed between the secondary power transmission output gear and the intermediate shaft.

8. The gear shifting apparatus of claim 7 , wherein the second clutch unit comprises a friction plate clutch or an electromagnetic clutch.

9. The gear shifting apparatus of claim 1 , wherein the gear shifting apparatus further comprises a differential unit, and wherein the differential unit is connected to the intermediate shaft for power transmission.

10. The gear shifting apparatus of claim 9 , wherein the differential unit comprises:
a main speed reducer power transmission input gear sleeved on the intermediate shaft, wherein the main speed reducer power transmission input gear is configured to rotate with the intermediate shaft;
a main speed reducer power transmission output gear configured to mesh with the main speed reducer power transmission input gear; and
a differential connected to the main speed reducer power transmission output gear for power transmission.

11. The gear shifting apparatus of claim 1 , wherein a first transmission ratio is obtained when the third clutch unit is combined with the intermediate shaft gear, wherein a second transmission ratio is obtained when the second clutch unit is combined with the intermediate shaft gear, and wherein the first transmission ratio is different than the second transmission ratio.

12. An electric drive system, comprising:
a drive motor comprising:
an input shaft; and
a drive body configured to drive the input shaft to rotate; and

a gear shifting apparatus comprising:
a primary power transmission unit connected to the input shaft, wherein the input shaft is configured for power transmission to the primary power transmission unit;
a secondary power transmission unit connected to the input shaft, wherein the input shaft is configured for power transmission to the secondary power transmission unit;
an intermediate shaft;
an intermediate shaft gear fixedly sleeved on the intermediate shaft;
a first clutch unit disposed between the intermediate shaft and the primary power transmission unit, wherein the first clutch unit is configured to achieve first power transmission between the primary power transmission unit and the intermediate shaft or break the first power transmission;
a second clutch unit disposed between the intermediate shaft and the secondary power transmission unit, wherein the second clutch unit is configured to achieve second power transmission between the secondary power transmission unit and the intermediate shaft or break the second power transmission; and
a third clutch unit disposed between the primary power transmission unit and the intermediate shaft gear, wherein the third clutch unit is configured to achieve third power transmission between the primary power transmission unit and the intermediate shaft gear or break the third power transmission, and wherein the gear shifting apparatus is in a self-locking state when the first clutch unit achieves the first power transmission, the second clutch unit achieves the second power transmission based on combining the second clutch unit with the intermediate shaft gear, and the third clutch unit achieves the third power transmission based on combining the third clutch unit with the intermediate shaft gear.

13. The electric drive system of claim 12 , wherein the gear shifting apparatus is in a non-self-locking state when the first clutch unit achieves the first power transmission, the second clutch unit achieves the second power transmission, and the third clutch unit breaks the third power transmission.

14. The electric drive system of claim 12 , wherein the third clutch unit comprises:
a third clutch disposed between the int

Assignees

• Huawei Digital Power Tech Co Ltd

Inventors

• Tang Zhengyi
• Guo Hai
• Wang Huan

Classifications

• F16H2003/0818

  comprising means for power-shifting · CPC title

• F16H61/0059 Primary

  Braking of gear output shaft using simultaneous engagement of engaging means, e.g. clutches or brakes, applied for different gear ratios · CPC title

• F16H37/0813

  with only one input shaft · CPC title

• F16H61/2807

  using electric control signals for shift actuators, e.g. electro-hydraulic control therefor  (F16H61/30, F16H61/32 take precedence) · CPC title

• F16H61/682

  with interruption of drive · CPC title