Hyundai Motor Company

Kia Motors Corporation

Sung Han Kang

Myungsik Choi

Wootae Kim

Won Gyu Kim

Hong Wook Lee

Myung Rae Cho

Hosung Cho

Eui Chul Choi

Taewon Park

Seong Hyuk Kang

Jin Gyu Yang

Dae Sung Kim

Duk Jin Park

Jinwoo Yang

A variable valve lift apparatus may include a variable valve lift housing, a master piston which is slidably disposed in the variable valve lift housing and contacts a cam, a slave piston which is slidably disposed in the variable valve lift housing, defines an oil chamber with the master piston therebetween, and opens a valve connected to the slave piston according to reciprocative motion of the master piston, and a lift control portion which supplies oil to the oil chamber or exhausts oil in the oil chamber selectively to control a relative distance between the master piston and the slave piston.

Variable valve lift apparatus

An electro-hydraulic variable valve lift apparatus may include a housing, a master portion which is slidably disposed to the housing and contacts a cam, a first oil supply portion which supplies hydraulic pressure, a slave piston which is slidably disposed within the housing and defines an oil chamber with the master portion, a latching portion which is supplied the hydraulic pressure from the first oil supply portion and selectively connects the slave piston and the master portion, a second oil supply portion which selectively supplies hydraulic pressure to the oil chamber so as to control relative distances between the master portion and the slave piston when the slave piston is disengaged with the master portion, and a stepped portion formed to the housing between the master portion and the slave piston to elastically support the master portion.

Electro-hydraulic variable valve lift apparatus

Growing community of inventors

Hwaseong-si, South Korea

Sung Han Kang