Internal combustion engine

Details Internal combustion engine Internal combustion engine

2005-09-13

2005-09-13

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090160, C123S090170, C123S090310

Reexamination Certificate

active

06941908

ABSTRACT:
An engine includes, a cylinder head, an intake valve, an exhaust valve, and a first clearance adjusting mechanism for actuating the intake valve. The first clearance adjusting mechanism (1) maintains a first valve clearance when the intake valve and the cylinder head are in a cold state, such that the intake valve closes after a bottom dead center, and (2) maintains a second valve clearance, shorter than the first valve clearance, when a temperature of the intake valve is in a hot state and a temperature of the cylinder head is still in the cold state, after a cold start of the engine, such that an open timing of the intake valve is advanced and a close timing of the intake valve is retarded. The exhaust valve opens and closes at fixed predetermined timings regardless of a temperature of the exhaust valve and the cylinder head.

REFERENCES:
patent: 5230317 (1993-07-01), Nonogawa et al.
patent: 6390869 (2002-05-01), Korenjak et al.
patent: 6439184 (2002-08-01), Takenaka et al.
patent: 6637386 (2003-10-01), Murata et al.
patent: 6837040 (2005-01-01), Sonoda et al.
patent: 2002-155767 (2002-05-01), None

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