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US 11,674,567 B2Granted
Electric vehicle transmission system
AssigneeDrivetech Co., Ltd.
InventorYun Yong Choi
Life of this patent
Estimating the term…
Abstract
An electric vehicle transmission system is disclosed. The electric vehicle transmission system is employing a planetary gear type speed reducer so as to implement first-gear shifting, second-gear shifting, or reverse shifting, thereby enabling reduced manufacturing costs of an electric vehicle while increasing the fuel efficiency of the electric vehicle, and also employing the planetary gear type speed reducer so as to implement forward and reverse shifting, thereby enabling reduced manufacturing costs of the electric vehicle while increasing the fuel efficiency of the electric vehicle.
Claims18
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.
15 more elements
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;
- a first-gear shifting part coupled to the sun gear to stop rotation of the sun gear to make first-gear shifting;
- a second-gear shifting part configured to engage the ring gear carrier with the planetary gear carrier, and to allow the input shaft, the ring gear carrier, the ring gear, the planetary gear, the planetary gear carrier, and the output shaft to become one body such that second-gear shifting is made,
- wherein the second-gear shifting part includes:
- a second-gear shifting hub fixed to the planetary gear carrier;
- a second-gear shifting sleeve configured to slide on the second-gear shifting hub to be coupled to or decoupled from the ring gear carrier;
- a second-gear shifting fork rotatably connected to the second-gear shifting sleeve;
- a second-gear shifting fork driving shaft connected to the second-gear shifting fork such that the second-gear shifting fork is linearly movable;
- and
- a second-gear shifting actuator motor configured to rotate the second-gear shifting fork driving shaft.
14 more elements
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 sun gear shaft-connected to the input shaft to rotate;
- a planetary gear mounted to be engaged with an outer portion of the sun gear;
- a planetary gear carrier configured to support the planetary gear such that the planetary gear is rotatable on the input shaft;
- an output shaft connected to the planetary gear carrier;
- a ring gear mounted on an outer portion of the planetary gear carrier and toothed to the planetary gear;
- a ring gear carrier configured to support the ring gear such that the ring gear is rotatable on the output shaft;
- a rotation control part configured to allow the ring gear to rotate only in one direction;
- a forward-gear shifting part fixedly coupled to the input shaft to rotate together with the sun gear and coupled to or decoupled from the planetary gear carrier to adjust forward-gear shifting;
- a reverse-gear shifting part rotatably coupled to the output shaft and coupled to or decoupled from the ring gear carrier to adjust reverse-gear shifting;
- and
- a shifting control unit configured to control the forward-gear shifting part not to be coupled to the planetary gear carrier and to control the reverse-gear shifting part not to be coupled to the ring gear carrier, in first-gear shifting,
- wherein the forward-gear shifting part includes:
- a forward-gear shifting hub fixedly connected to the input shaft to receive the rotational force from the power source;
- a forward-gear shifting sleeve configured to slide on the forward-gear shifting hub and coupled to or decoupled from the planetary gear carrier;
- a forward-gear shifting fork rotatably connected to the forward-gear shifting sleeve;
- a forward-gear shifting fork driving shaft connected to the forward-gear shifting fork such that the forward-gear shifting fork linearly moves;
- and
- a forward-gear shifting actuator motor configured to rotate the forward-gear shifting fork driving shaft.
17 more elements
Dependencies are inferred from the claim text.