Variable valve drive of an internal combustion engine

Details Variable valve drive of an internal combustion engine Variable valve drive of an internal combustion engine

2005-10-12

2009-08-04

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090390, C123S090440, C123S090460, C074S569000

Reexamination Certificate

active

07568460

ABSTRACT:
A variable valve drive (1) of an internal combustion engine is provided which is used to actuate a gas exchange valve (5). Displacement thereof takes place via a cam (7) generated lift and via a lift generated by a piston (14, 32) of a hydraulic force applying device (4a,4b), which is superimposed on the cam lift and which is independent thereof. The hydraulic force applying device is connected to a hydraulic fluid line (S-P) which provides an adjustable hydraulic pressure medium and includes a pressure chamber (24a,24b) which is limited on one side by the piston (14, 32), in addition to a hydraulic valve lash compensation device (23a,23b) which includes a working chamber (22a,22b) which is radially defined by a housing (13a,13b). The housing (13a,13b) is also used to radially define the pressure chamber (24a,24b).

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