Intake- and/or exhaust-valve timing control system for internal

Details Intake- and/or exhaust-valve timing control system for internal Intake- and/or exhaust-valve timing control system for internal

1989-08-18

1991-05-07

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, F01L 134

Patent

active

050127730

ABSTRACT:
An intake- and/or exhaust-valve timing control system for internal combustion engines in which a ring gear mechanism is provided between a timing pulley and a cam shaft for adjusting the phase angle between the pulley and the cam shaft. A drive mechanism is also provided for driving the ring gear mechanism depending upon the operating state of the engine. The drive mechanism includes a hydraulic circuit having oil supply and exhaust passages, a flow control valve having a spool valve for controlling the amount of working fluid flowing through the hydraulic circuit, a controller for monitoring the operating state of the engine, and an electromagnetic actuator having a plunger rod for actuating the flow control valve in response to the control signal from the controller. The flow control valve and the actuator are integrally mounted in the cylinder head. Therefore, relative friction between the facing ends of the spool valve and the plunger rod is avoided.

REFERENCES:
patent: 4231330 (1980-11-01), Garcea
patent: 4421074 (1983-12-01), Garcea et al.
patent: 4535731 (1985-08-01), Banfi
patent: 4811698 (1989-03-01), Akasaka et al.
patent: 4856465 (1989-08-01), Denz et al.
patent: 4889086 (1989-12-01), Scapecchi et al.

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