Variable valve train of an internal combustion engine

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

2008-07-01

2008-07-01

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C123S090120, C123S090440, C123S090450, C123S090160, C074S569000

Reexamination Certificate

active

07392777

ABSTRACT:
The invention proposes a variable valve train (1) for a gas exchange valve (8) of an internal combustion engine, which gas exchange valve (8) is actuated by a cam (2), said valve train (1) comprising a force transmission device (4) that is arranged between the cam (2) and the gas exchange valve (8) and includes a hydraulic lifting device (9) comprising a pressure piston (10) that is arranged for longitudinal displacement in a cylinder (12), said pressure piston (10) defining a pressure chamber (13) that is connected to a pressure medium supply of the internal combustion engine and said pressure piston (10) permitting, under high-pressure loading, an actuation of the gas exchange valve (8) independently of the cam (2). The force transmission device (4) is configured as an oscillating lever or rocker arm (3) mounted for pivoting on a lever shaft (6) comprising a longitudinal channel (14) that transports pressure medium and acts as a link (15) between the pressure medium supply and the pressure chamber (13).

REFERENCES:
patent: 3809033 (1974-05-01), Cartledge
patent: 4523551 (1985-06-01), Arai et al.
patent: 6422186 (2002-07-01), Vanderpoel
patent: 6925976 (2005-08-01), Israel et al.
patent: 2002/0066428 (2002-06-01), Kammerdiener et al.
patent: 2004/0231639 (2004-11-01), Irael et al.

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