US 12,403,765 B2
All-wheel drive system
Akira Ono, Tokyo (JP)
Assigned to SUBARU CORPORATION, Tokyo (JP)
Filed by SUBARU CORPORATION, Tokyo (JP)
Filed on Jul. 29, 2022, as Appl. No. 17/877,496.
Claims priority of application No. 2021-148294 (JP), filed on Sep. 13, 2021.
Prior Publication US 2023/0081563 A1, Mar. 16, 2023
Int. Cl. B60K 23/08 (2006.01); B60K 23/04 (2006.01)
CPC B60K 23/04 (2013.01) [B60K 23/0808 (2013.01); B60K 2023/043 (2013.01); B60K 2023/0816 (2013.01); B60K 2023/085 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An all-wheel drive system comprising:
a center differential configured to distribute torque input thereto between front wheels and rear wheels of a vehicle;
a limited-slip differential clutch configured to limit a differential operation of the center differential in accordance with an engaging pressure and change a front-rear torque distribution ratio between the front wheels and the rear wheels;
a front-wheel torque transmission system configured to transmit torque between the center differential and the front wheels;
a rear-wheel torque transmission system configured to transmit torque between the center differential and the rear wheels; and
a controller configured to adjust the engaging pressure of the limited-slip differential clutch based on a driving state of the vehicle,
wherein a reduction ratio of the front-wheel torque transmission system and a reduction ratio of the rear-wheel torque transmission system are set to be different from each other, and
wherein the center differential is configured such that the front-rear torque distribution ratio is initially unequal and is changeable.