Patent ID: 8528509

Claim:
A variable valve lift apparatus comprising: 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, wherein the lift control portion comprises: a lift control valve which is slidably disposed to the variable valve lift housing and of which an oil hole is formed thereto for supplying oil to the oil chamber or exhausting oil from the oil chamber; and a lift control member for controlling position of the lift control valve to selectively open the oil chamber through the oil hole; wherein a control valve hole is formed to the variable valve lift housing and the lift control valve is slidably coupled to the control valve hole.