Patent ID: 8899195
Filing Date: 2014-12-02
Classification: F01L

Abstract:
1. An electro-hydraulic variable valve lift apparatus comprising: a hydraulic pump body installed in an engine; a piston slidably provided in the hydraulic pump body to reciprocate therein and forming a hydraulic pump chamber together with the hydraulic pump body; a hydraulic pump cam disposed to be in contact with the piston and enabling the piston to reciprocate according to a rotation of the hydraulic pump cam; a retainer provided in the engine to be slidable along a longitudinal direction of the piston between the piston and the en line and form a retainer chamber with the engine; a retainer spring elastically supporting the retainer; an oil control valve selectively allowing the hydraulic pump chamber and the retainer chamber to fluid-communicate with each other; and a valve opening and closing unit fluid-communicating with the hydraulic pump chamber and opened or closed according to oil pressure supplied from the hydraulic pump chamber thereto; wherein the retainer spring is brought into contact with the retainer and the piston to provide elastic force to the piston; wherein the hydraulic pump body includes a retainer hole fluid-communicating the hydraulic pump chamber with the retainer chamber, and wherein the oil control valve includes an operational rod slidably mounted in the retainer chamber and selectively opens or closes the retainer hole through operation of the operational rod.