Variable-valve-actuation apparatus for internal combustion...

Details Variable-valve-actuation apparatus for internal combustion... Variable-valve-actuation apparatus for internal combustion...

2006-05-23

2006-05-23

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090150, C123S090110

Reexamination Certificate

active

07047921

ABSTRACT:
A VVA apparatus includes a control shaft arranged rotatable in accordance with the engine operating conditions, an alteration mechanism for changing a lift amount and an operating angle of an engine valve in accordance with rotation of the control shaft, and a drive mechanism for rotating the control shaft and including an electric motor and a reduction mechanism. The reduction mechanism has a reduction ratio set to be larger when the valve is under small lift-amount and operating-angle control than when the valve is under large lift-amount and operating-angle control.

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