MULTI-STAGE TRANSMISSION FOR VEHICLE

摘要

A multi-stage transmission for vehicle may an input shaft, an output shafts, first to fourth planetary gear devices transmitting rotary force between the input and output shafts, each of them having three rotary elements, and at least six shifting elements connected to the rotary elements of the planetary gear devices, wherein first rotary element of the first planetary gear device is permanently connected to the input shaft, second rotary element is installed to be fixable by any one of the shifting elements, and third rotary element is permanently connected to second rotary element of the second planetary gear device.

主权项

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