Patent ID: 8596234
Filing Date: 2013-12-03
Classification: F01L

Abstract:
1. An electro-hydraulic variable valve lift apparatus comprising: a housing including a housing protruding portion formed therein; a driving cam; a pump piston received in a main chamber of the housing that reciprocates within the housing according to rotation of the driving cam, and which forms hydraulic pressure within the main chamber; a pump piston elastic portion elastically supporting the pump piston; an oil pressure controller in fluid communication with the main chamber to control hydraulic pressure within the main chamber; a hydraulic piston slidably disposed within the housing and operably connected with a valve; a multiple orifice unit slidably disposed within the hydraulic piston forming an auxiliary chamber with the hydraulic piston, the multiple orifice unit including an orifice hole communicating the main chamber with the auxiliary chamber; and an orifice unit elastic portion disposed within the auxiliary chamber to elastically support the multiple orifice unit.