US 11,674,567 B2
Electric vehicle transmission system
Yun Yong Choi, Gimpo-si (KR)
Assigned to DRIVETECH CO., LTD., Bucheon-si (KR)
Filed by DRIVETECH CO., LTD., Bucheon-si (KR)
Filed on Oct. 1, 2020, as Appl. No. 17/60,617.
Application 17/060,617 is a continuation of application No. PCT/KR2018/014951, filed on Nov. 29, 2018.
Claims priority of application No. 10-2018-0038164 (KR), filed on Apr. 2, 2018; and application No. 10-2018-0060948 (KR), filed on May 29, 2018.
Prior Publication US 2021/0071741 A1, Mar. 11, 2021
Int. Cl. F16H 3/72 (2006.01); F16H 63/30 (2006.01); F16H 3/54 (2006.01)
CPC F16H 3/725 (2013.01) [F16H 3/54 (2013.01); F16H 63/302 (2013.01); F16H 2200/0021 (2013.01); F16H 2200/0034 (2013.01); F16H 2200/2005 (2013.01); F16H 2200/2035 (2013.01); F16H 2200/2082 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A transmission system for an electric vehicle, the transmission system comprising:
a power source configured to provide power;
an input shaft mounted to receive rotational force from the power source;
a ring gear carrier connected to the input shaft to rotate as the input shaft rotates;
a ring gear connected to the ring gear carrier to rotate as the ring gear carrier rotates;
a planetary gear mounted to be engaged with an inner portion of the ring gear and to rotate;
a planetary gear carrier connected to the planetary gear to rotate as the planetary gear rotates;
an output shaft connected to the planetary gear carrier to rotate together with the planetary gear carrier;
a sun gear mounted to be engaged with an inner portion of the planetary gear to rotate and connected to the output shaft such that the output shaft is rotatable; and
a first-gear shifting part coupled to the sun gear to stop rotation of the sun gear to make first-gear shifting,
wherein the first-gear shifting part includes:
a sleeve guide fixedly connected to the sun gear;
a fixed sleeve guide mounted to be spaced apart from the sleeve guide;
a first-gear shifting sleeve configured to slide on the fixed sleeve guide to be coupled to or decoupled from the sleeve guide;
a first-gear shifting fork rotatably connected to the first-gear shifting sleeve;
a first-gear shifting fork driving shaft connected to the first-gear shifting fork such that the first-gear shifting fork linearly moves; and
a first-gear shifting actuator motor configured to rotate the first-gear shifting fork driving shaft.