MULTI-STAGE TRANSMISSION FOR VEHICLE

摘要

The present disclosure is a multi-stage transmission for a vehicle that has at least ten forward shifting stages and one reverse shifting stage. The multi-stage transmission has a relatively small number of parts and a simple configuration such that an engine may be operated at desired operation, thereby providing an improvement in the fuel efficiency of the vehicle, and the engine may be operated more quietly, thereby improving the quietness of the vehicle.

主权项

1. A multi-stage transmission for a vehicle comprising:
an input shaft; an output shaft; first, second, third and fourth planetary gear devices disposed between the input shaft and the output shaft to transmit rotary force, each of the first, second, third and fourth planetary gear devices having three rotary elements; and at least six shifting elements connected to the rotary elements of the planetary gear devices, wherein a first rotary element of the first planetary gear device stays connected to a third rotary element of the fourth planetary gear device, a second rotary element of the first planetary gear device stays connected to the input shaft and variably connected to a first rotary element of the second planetary device and a third rotary element of the third planetary device, respectively, a third rotary element of the first planetary gear device stays connected to a second rotary element of the second planetary gear device, wherein the second rotary element of the second planetary gear device stays connected to a first rotary element of the third planetary gear device, and a third rotary element of the second planetary gear device stays connected to a second rotary element of the third planetary gear device, wherein the first rotary element of the third planetary gear device is installed to be selectively fixable by one shifting element of the at least six shifting elements, and the second rotary element the third planetary gear device stays connected to a first rotary element of the fourth planetary gear device, and wherein the first rotary element of the fourth planetary gear device is installed to be selectively fixable by another shifting element of the at least six shifting elements, a second rotary element of the fourth planetary gear device stays connected to the output shaft, and the third rotary element of the fourth planetary gear device is installed to be selectively fixable by further another shifting element of the at least six shifting elements.