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US 9,958,034 B2Granted
Multi-stage transmission for vehicle
AssigneeHyundai Motor Company
InventorsSeong Wook Hwang, Jae Chang Kook, Hyu Tae Shim, Seong Wook Ji, Won Min Cho, Kang Soo Seo, Myeong Hoon Noh
Life of this patent
Estimating the term…
Abstract
A multi-stage transmission for a vehicle is provided that has at least nine forward shifting stages and one reverse shifting stage with a relatively small number of parts and a configuration such that an engine may be operated at desired operation points, thereby increasing fuel efficiency of the vehicle, and the engine may be operated more quietly, thereby improving the quietness of the vehicle.
Claims7
A multi-stage transmission for a vehicle, comprising:
- an input shaft;
- an output shaft;
- a 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 pear devices having three rotary elements;
- and
- at least six shifting elements connected to the rotary elements of the planetary gear devices, the at least six shifting elements including first, second, third, fourth, fifth and sixth shifting elements;
- wherein a first rotary element of the first planetary gear device is fixed, a second rotary element of the first planetary gear device stays connected to a third rotary element of the second planetary gear device, and a third rotary element of the first planetary gear device is variably connected to a second rotary element of the second planetary gear device and stays connected to a first rotary element of the third planetary gear device and a first rotary element of the fourth planetary gear device;
- wherein a first rotary element of the second planetary gear device is variably connected to the input shaft, and the second rotary element of the second planetary gear device is installed to be selectively fixable by the fifth shifting element of the at least six shifting elements and variably connected to the input shaft;
- wherein a second rotary element of the third planetary gear device stays connected to the output shaft, and a third rotary element of the third planetary gear device is installed to be selectively fixable by the sixth shifting element of the at least six shifting elements,
- wherein a second rotary element of the fourth planetary gear device stays connected to the input shaft, and a third rotary element of the fourth planetary gear device is variably connected to the output shaft by the fourth shifting element of the at least six shifting elements.
6 more elements
A multi-stage transmission for a vehicle comprising:
- a first, second, third and fourth planetary gear devices having three rotary elements, respectively;
- six shifting elements configured to variably provide frictional force;
- and
- first, second, third, fourth, fifth, sixth, seventh and eighth rotary shafts connected to the rotary elements of the first to fourth planetary gear devices,
- wherein the first rotary shaft is an input shaft, the second rotary shaft is connected to a second rotary element of the second planetary gear device, the third rotary shaft is connected to a second rotary element of the first planetary gear device and a third rotary element of the second planetary gear device, the fourth rotary shaft is connected to a third rotary element of the first planetary gear device, a first rotary element of the third planetary gear device and a first rotary element of the fourth planetary gear device, the fifth rotary shaft is connected to a first rotary element of the second planetary gear device, the sixth rotary shaft is connected to a third rotary element of the third planetary gear device, the seventh rotary shaft is connected to a third rotary element of the fourth planetary gear device, and the eighth rotary shaft is an output shaft connected to a second rotary element of the third planetary gear device;
- and
- wherein the six shifting elements include a first, second, third and fourth clutches and a first and second brakes, the first clutch is disposed between the first rotary shaft and the second rotary shaft, the second clutch is disposed between the second rotary shaft and the fourth rotary shaft, the third clutch is disposed between the first rotary shaft and the fifth rotary shaft, the fourth clutch is disposed between the seventh rotary shaft and the eighth rotary shaft, the first brake is disposed between the second rotary shaft and a transmission case, and the second brake is disposed between the sixth rotary shaft and the transmission case.
4 more elements
Dependencies are inferred from the claim text.