Title:
DIRECT TYPE VALVE SYSTEM
Document Type and Number:
Japanese Patent JPH0357804
Kind Code:
A
Abstract:
PURPOSE:To enlarge a control range and to improve control accuracy by constructing a direct type valve system in a way that a pause of a valve is judged to fully open the electromagnetic relief valve of a predetermined valve and valve timing corresponding to various operating conditions is determined to variably control relief quantity. CONSTITUTION:At the time of operating an engine, in case that the cam 10 of a valve system 4 is on a base circle, oil is usually supplied from an oil pump 30 to the hydraulic chamber 24 of a hydraulic lifter 20, one of the oil is relieved at an electromagnetic relief valve 34 and the oil is filled up to predetermined volume. The cam 10 is rotated by a camshaft 9 to be lifted and thereby the cam piston 22 of the hydraulic lifter 20 is shifted. The electromagnetic relief valve 34 is closed by a control unit 45 under predetermined timing to produce high pressure inside to press a lifter piston 23. As a result, an intake/exhaust valve 3 is lifted in opposition to a valve spring 8 to be opened directly.
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Inventors:
WATANABE KENZO
Application Number:
JP19524389A
Publication Date:
March 13, 1991
Filing Date:
July 26, 1989
Export Citation:
Assignee:
FUJI HEAVY IND LTD
International Classes:
F01L13/00; (IPC1-7): F01L13/00
Attorney, Agent or Firm:
Nobuhiro Kobashi (1 outside)
Next Patent: JPH0357805