Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1988-01-12
1989-08-08
Wolfe, Willis R.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9016, 123 9046, 123 9036, F01L 108, F01L 134, F01L 124
Patent
active
048542733
ABSTRACT:
An oil pressure control apparatus for a valve driving system for an internal combustion engine, in which a main oil supply passage feeds oil to a hydraulic actuator of the engine valve driving apparatus. A control valve is provided for closing the oil supply passage. A bypass oil passage bypasses the control valve continuously. The control valve, when closed, regulates the oil pressure to below a predetermined value and the oil pressure is insufficient to actuate the hydraulic actuator. When the control valve is opened, responsive to an engine operating condition such as engine speed, oil pressure is above the predetermined value, and the hydraulic actuator is actuated rapidly to shift the valve driving system from low speed to high speed operation.
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Nakai Eiji
Uesugi Tatsuya
Mazda Motor Corporation
Wolfe Willis R.
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