US 11,987,129 B1
Power train of automatic transmission
Tae Hoon Kim, Hwaseong-si (KR)
Assigned to Hyundai Transys Inc., Seosan-si (KR)
Filed by Hyundai Transys Inc., Seosan-si (KR)
Filed on Sep. 7, 2023, as Appl. No. 18/462,775.
Int. Cl. B60K 6/54 (2007.10); B60K 6/365 (2007.10); B60K 6/48 (2007.10)
CPC B60K 6/54 (2013.01) [B60K 6/365 (2013.01); B60K 6/48 (2013.01); B60K 2006/4825 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A power train of an automatic transmission, comprising:
a first planetary gear set including a first sun gear selectively fixed to a case by a first brake, a first carrier, and a first ring gear selectively fixed to the case by a second brake;
a second planetary gear set connected to the first planetary gear set and including a second sun gear connected to the first sun gear, a second carrier, and a second ring gear;
a third planetary gear set connected to the second planetary gear set and including a third sun gear, a third carrier, and a third ring gear; and
a fourth planetary gear set connected to the third planetary gear set and including a fourth sun gear, a fourth carrier, and a fourth ring gear,
wherein the first carrier is integrally configured with a single pinion that is engaged with the first sun gear and the first ring gear,
wherein the second carrier is integrally configured with a single pinion that is engaged with the second sun gear and the second ring gear,
wherein the third carrier is integrally configured with a single pinion that is engaged with the third sun gear and the third ring gear,
wherein the fourth carrier is integrally configured with a single pinion that is engaged with the fourth sun gear and the fourth ring gear,
wherein the power train is configured to implement a reverse shift position by transmitting a reverse drive of a motor through an input shaft to a same power transmission path as a first shift position,
wherein, at the reverse shift position, the power train is configured to transmit power generated by the reverse drive of the motor to the input shaft, transmit the power transmitted to the input shaft to the third sun gear via the second carrier by an engagement operation of a third clutch, transmit the power transmitted to the third sun gear to the fourth sun gear via the third ring gear, and output the power transmitted to the fourth sun gear to an output shaft via the fourth ring gear.