MULTI-STAGE TRANSMISSION FOR VEHICLE

摘要

The present disclosure relates to a multi-stage transmission for a vehicle that includes four planetary gear devices and six shifting elements, and each of the planetary gear devices include three rotary elements selectively connected to the six shifting elements, preferably so that the multi-stage transmission provides at least ten forward shifting stages and at least one reverse shifting stage with a relatively small number of parts and a simple configuration. In this configuration, an engine may be operated at desired operation points, to improve the fuel efficiency of the vehicle and improve the quietness of the vehicle.

主权项

1. A multi-stage transmission for a vehicle, comprising:
an input shaft; an output shaft; a first planetary gear device, a second planetary gear device, a third planetary gear device, and a fourth planetary gear device 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 a first, second, and third rotary element; and at least six shifting elements, each shifting element connected to at least one of the first, second, and third rotary elements of the first, second, third, and fourth planetary gear devices; wherein the first rotary element of the first planetary gear device is installed to be fixable by a first shifting element of the at least six shifting elements, the second rotary element of the first planetary gear device is permanently connected to the third rotary element of the third planetary gear device and the third rotary element of the fourth planetary gear device, and the third rotary element of the first planetary gear device is selectively connected to the first rotary element of the second planetary gear device and the second rotary element of the third planetary gear device; wherein the first rotary element of the second planetary gear device is installed to be fixable by a second shifting element of the at least six shifting elements, the second rotary element of the second planetary gear device is permanently connected to the input shaft and selectively connected to the second rotary element of the third planetary gear device, and the third rotary element of the second planetary gear device is permanently connected to the first rotary element of the third planetary gear device; wherein the first rotary element of the third planetary gear device is permanently connected to the 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 fixable by a third shifting element of the at least six shifting elements, and the second rotary element of the fourth planetary gear device is permanently connected to the output shaft.