Hyundai Motor Company

Donghoon Park

Jaeduk Jang

Kibeen Lim

Taeseok Seo

Jinseong Kim

Seonghyon Park

The hydraulic control system includes a pressure regulating valve regulating hydraulic pressure generated by a hydraulic pump, and a pressure control valve controlling the regulated hydraulic pressure. A hydraulic pressure distributing valve set distributes the controlled regulated hydraulic pressure to a plurality of friction elements, and a shift control valve controls operation of the hydraulic pressure distributing valve set by controlling distribution of an application hydraulic pressure to the hydraulic pressure distributing valve set. A creep control unit selectively prevents the vehicle from creeping without depressing a brake pedal by supplying the application hydraulic pressure from the shift control valve to at least one of the friction elements. To this end, the creep control unit includes a creep control valve and a solenoid valve.

Hydraulic control system used in automatic transmission for vehicle

A power train of an automatic transmission for a vehicle, which automatically and successively accomplishes a change of speed in a low speed range where driving time is short and a shift impact is severe, directly connects a transmission in high speed range where a high mechanical efficiency of power transmission is required, thereby reducing the shift impact, improving a specific fuel consumption, minimizing the number of one-way clutches for the shift impact and being simply designed.

Power train of automatic transmission for vehicle

Disclosed is a power train of an automatic transmission for a vehicle, which includes a device for making a continuous shifting operation in the low speed region, directly connecting the power train with the output shaft of the engine so as to reduce the shifting shock impulses, and reducing the number of the one-way clutches so as to simplify the whole structure.

Power train of an automatic transmission for a vehicle

Power train of five-speed automatic transmission for vehicle

An automatic transmission used in a vehicle for producing one of four forward speeds or a backward speed, which includes a torque converter with an impeller, turbine and stator for changing the torque speed of the power of the engine; a first planetary gear unit having a first sun gear, first planetary gear, a first planetary carrier and first ring gear; a second planetary gear unit having a second sun gear, second planetary gear, a second planetary carrier and second ring gear; a first transfer gear connected to the first planetary carrier for transferring the torque of the first planetary gear to the second ring gear; a second transfer gear connected to the second planetary carrier for transferring the torque of the second planetary gear to aid first ring gear; a first transfer shaft for transferring the torque of the turbine to the first planetary gear unit, the first planetary gear unit and first transfer gear being mounted on the first transfer shaft; a second transfer shaft for transferring the torque received from the first planetary gear unit and first transfer gear to a final gear unit connected to a differential gear; and a main reduction gear unit for making a suitable combination of the gears of the first and second planetary gear units, transfer gears, and the first and second shafts to produce one of the four forward speeds or the backward speed.

Automatic transmission for a vehicle

Power train of an automatic transmission for vehicle

Hydraulic control system for automatic transmission

A gear train of an automatic five-speed transmission includes an input shaft for transferring the power of an engine via a torque converter, a first-speed drive gear mounted on the input shaft, a first-speed driven gear meshed with the first-drive gear to produce a reduced speed ratio, an output shaft for transferring the power received from the first-speed driven gear to a differential gear, a planetary gear unit connected with the input shaft, a first friction element selectively connected with the input shaft and output shaft for producing a first reduced speed ratio, a second friction element selectively connected with the input shaft for transferring the input power through a first power transfer member to a first sun gear of the planetary gear unit to produce a second reduced speed ratio, a third friction element selectively connected with the input shaft for transferring the input power through a second power transfer member to the planetary carrier of the planetary gear unit serving as an input element, and a fourth friction element for gripping a third power transfer member to employ as a reacting element a second sun gear receiving the rotational force of the first sun gear of the planetary gear unit serving as an input element.

Growing community of inventors

Kyungki-do, South Korea

Donghoon Park