Valve mechanism for internal combustion engines

Details Valve mechanism for internal combustion engines Valve mechanism for internal combustion engines

2006-01-31

2006-01-31

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090170, C123S090310

Reexamination Certificate

active

06990938

ABSTRACT:
A valve operating device for an internal combustion engine is capable of increasing a negative valve overlapping duration when maximum lift amounts of an intake valve and an exhaust valve are small. The valve operating device is provided with intake-side and exhaust-side characteristic adjustment mechanisms for adjusting operating characteristics of an intake valve and an exhaust valve. Each characteristic adjustment mechanism has a control cam rotating integrally with a cam shaft, an electric motor that causes a holder pivoted on the cam shaft to rotate about the cam shaft, a sub-rocker lever pivoted on the holder and caused to oscillate by the control cam, and a valve cam that is caused to oscillate around the cam shaft by oscillation of the holder and the sub-rocker lever, for causing oscillation of main rocker levers. The electric motor causes the holder to oscillate in such a manner that the valve open timing of the intake valve is retarded as a maximum lift amount of the intake valve becomes smaller and the valve close timing of the exhaust valve is advanced as a maximum lift amount of the exhaust valve becomes smaller.

REFERENCES:
patent: 5937809 (1999-08-01), Pierik et al.
patent: 6019076 (2000-02-01), Pierik et al.
patent: 6311659 (2001-11-01), Pierik
patent: 6401677 (2002-06-01), Rohe et al.
patent: 2001/0037781 (2001-11-01), Fischer et al.
patent: 2002/0007810 (2002-01-01), Pierik
patent: 01-167425 (1999-07-01), None

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