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US 8,784,259 B2Granted
Transmission for vehicle
AssigneeHyundai Motor Company
InventorsHyu Tae Shim, Kang Soo Seo
Life of this patent
Estimating the term…
Abstract
A transmission for a vehicle employs parts as few as possible to provide forward 11-speed and reverse 3-speed gear ratios along with relatively simple configuration, thereby allowing the operational state of an engine connected thereto to achieve an optimal state. Thus, the transmission makes it possible to improve fuel efficiency and to secure smooth driving performance of the vehicle.
Claims9
A transmission for a vehicle comprising:
- a first compound planetary gear train in which a first planetary gear train and a second planetary gear train are coupled to each other;
- a second compound planetary gear train in which a third planetary gear train and a fourth planetary gear train are coupled to each other and at least one rotational element thereof is connected with a rotational element of the first compound planetary gear train;
- an input shaft which is connected to rotational elements of the first compound planetary gear train by at least two paths and is connected to rotational elements of the second compound planetary gear train by at least two paths;
- an output shaft which is connected to one rotational element of the second compound planetary gear train;
- first and second brakes, each of which locks the rotational elements of the first compound planetary gear train;
- a third brake which locks the rotational element of the second compound planetary gear train;
- and
- a first clutch which selectively connects the rotational elements of the first and second planetary gear trains to each other;
- wherein the input shaft is permanently connected to a first rotational element of the second planetary gear train;
- wherein the input shaft is selectively connected to a first rotational element of the third planetary gear train and a first rotational element of the fourth planetary gear train via a second clutch;
- wherein the input shaft is selectively connected to a second rotational element of the third planetary gear train via a third clutch;
- and
- wherein the input shaft is selectively connected to a first rotational element of the first planetary gear train via a fourth clutch.
10 more elements
Dependencies are inferred from the claim text.