US 12,092,167 B2
Speed shifting structure of electric driving apparatus for vehicle and electric driving apparatus including same
Tae Geun Kim, Daegu (KR); Jung Rak Son, Daegu (KR); and Myung Chul Jung, Daegu (KR)
Assigned to ERAE AMS CO., LTD., Daegu (KR)
Appl. No. 18/270,367
Filed by ERAE AMS CO., LTD., Daegu (KR)
PCT Filed Dec. 27, 2021, PCT No. PCT/KR2021/019934
§ 371(c)(1), (2) Date Jun. 29, 2023,
PCT Pub. No. WO2022/145921, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 10-2020-0187638 (KR), filed on Dec. 30, 2020; application No. 10-2020-0187639 (KR), filed on Dec. 30, 2020; and application No. 10-2020-0187648 (KR), filed on Dec. 30, 2020.
Prior Publication US 2024/0117847 A1, Apr. 11, 2024
Int. Cl. F16D 25/08 (2006.01); F16D 25/0638 (2006.01); F16D 25/10 (2006.01); F16D 125/58 (2012.01); F16H 3/085 (2006.01)
CPC F16D 25/083 (2013.01) [F16D 25/0638 (2013.01); F16D 25/10 (2013.01); F16D 2125/585 (2013.01); F16H 3/085 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A speed shifting structure for reducing a rotational speed of a rotation driving force of an electric driving apparatus having a motor shaft, comprising:
an input gear receiving the rotational driving force of the motor shaft;
a speed shifting shaft rotatably installed around a rotation axis;
an output gear provided on the speed shifting shaft to rotate together with the speed shifting shaft; and
a clutch unit operative to selectively achieve a rotationally constrained engagement between the input gear and the speed shifting shaft,
wherein the clutch unit comprises:
a piston configured to move along the rotation axis by hydraulic pressure;
a clutch housing coupled to the speed shifting shaft in a rotationally constrained state so as to rotate together with the speed shifting shaft;
a clutch hub coupled to the input gear in a rotationally constrained state so as to rotate together with the input gear;
a clutch plate package operative to selectively effect a rotationally constrained engagement between the clutch housing and the clutch hub; and
a force transmitting member configured to transmit force for operating the clutch plate package to the clutch plate package in response to movement of the piston,
wherein the piston and the clutch plate package are respectively disposed on both sides of the input gear along the rotation axis, and
wherein the force transmitting member comprises: a body portion that is disposed between the piston and the input gear; and a protrusion that protrudes in a direction parallel to the rotation axis from the body portion and passes a through hole formed in the input gear to be exposed to a space where the clutch plate package is located,
wherein the clutch unit further comprises:
a return spring providing a force for returning the force transmitting member moved toward the clutch plate package by movement of the piston; and
a snap ring coupled to the protrusion to limit a return movement of the force transmitting member by the return spring.