Hyundai Motor Company

Kia Motors Corporation

Kia Corporation

Sung Hoon Park

Hyu Tae Shim

Kang Hoon Lee

Jae Young Jeon

Kangsoo Seo

Myeong Hoon Noh

Tae Seok Seo

In Chan Kim

Hyunjun Son

Sang Bum Baek

Wonseok Oh

Joo Hang Lee

Jaeyoung Jeon

Won Seok Oh

Il Dae Cho

A clutch unit of an automatic transmission having first and second rotation elements may include a spline gear connected to the first rotation element, a clutch drum having an internal circumference spline-engaged with the spline gear to be movable in an axial direction, a clutch hub fixedly connected to a second rotation element, a plurality of clutch plates spline-engaged with the clutch drum, a plurality of clutch disks alternatingly disposed between the plurality of clutch plates and spline-engaged with the clutch hub, a supporting portion fixed to a transmission housing of the automatic transmission and configured to support the plurality of clutch plates, and a piston disposed in an interior of the transmission housing to form a hydraulic pressure chamber with the transmission housing, configured to have a rolling contact with the clutch drum interposing a bearing, and configured to transmit a pressurizing force to the plurality of clutch plates and the clutch disks through the clutch drum.

Clutch unit for automatic transmission

A powertrain may include an input shaft; a drive pulley and a driven pulley engaged to each other by a belt; a forward/backward switching mechanism provided to selectively switch a direction of power from the input shaft to the drive pulley by a plurality of friction members and transmit the power; a gear train provided to transmit the power of the input shaft to a rotation shaft of the driven pulley without passing through the drive pulley; and another friction member provided to interrupt a power transmission path of the gear train.

Continuously variable powertrain for vehicle

An automatic transmission includes: first, second, and third planetary gear sets each having three rotating elements; seven coupling elements variably providing a frictional force; and seven shafts. In particular, a first shaft is fixedly connected to a second rotating element of the third planetary gear set and an input shaft, a third shaft is fixedly connected to a third rotating element of the second planetary gear set, a fourth shaft is fixedly connected to a first rotating element of the second planetary gear set and a third rotating element of the third planetary gear set, a sixth shaft is directly connected to a first rotating element of the third planetary gear set and a transmission casing, a seventh shaft is fixedly connected to a third rotating element of the first planetary gear set and an output shaft, and remaining two shafts are selectively fixed to the transmission casing.

Automatic transmission for vehicle

A hydraulic control system of an automatic transmission may be applied to an automatic transmission in which a reverse speed stage is engaged by engagement of first and second friction elements. The hydraulic control system may include: a first solenoid valve being a normally open type and controlling a line pressure to generate a first hydraulic pressure; a second solenoid valve being a normally closed type and controlling the line pressure to generate a second hydraulic pressure; first and second switch valves, the first switch valve selectively supplying the first hydraulic pressure to the second switch valve; and a fail-safe valve selectively supplying the first hydraulic pressure or the second hydraulic pressure to the second friction element, wherein the second switch valve selectively supplies the first hydraulic pressure supplied from the first switch valve or a reverse speed pressure to the first friction element.

Hydraulic control system for automatic transmission of vehicle

A gear train may include an input shaft adapted to receive torque of an engine, an output shaft adapted to output changed torque, a first planetary gear set including a first sun gear, a first planet carrier, and a first ring gear as rotation elements thereof, a second planetary gear set including a second sun gear, a second planet carrier, and a second ring gear as rotation elements thereof, and a third planetary gear set including a third sun gear, a third planet carrier, and a third ring gear as rotation elements thereof.

Gear train of automatic transmission for vehicle

A power train for an automatic transmission having at realizes seven forward speeds and two reverse speeds may include: a first planetary gear set, a second planetary gear set, a third planetary gear, an input shaft, an output gear, and a transmission case. Utilizing arrangements of these components as described herein, such an automatic transmission may be provided with increased durability and more compact size.

Power train for automatic transmission

Growing community of inventors

Seongnam-si, South Korea

Sung Hoon Park