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

1991-11-22

1993-05-11

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9034, 123 9031, F01L 134, F01M 106

Patent

active

052091937

ABSTRACT:
An intake- and/or exhaust-valve timing control system for an internal combustion engine comprises a timing belt pulley having a driven connection with an engine crankshaft, a camshaft journaled by a bearing member mounted on a cylinder head and receiving torque transmitted from the timing belt pulley, a ring gear mechanism for adjusting a relative phase angle between the timing belt pulley and the camshaft. The valve timing control system includes a first hydraulic circuit provided for drivingly controlling the ring gear mechanism via fluid pressure depending upon the operating state of the engine and a second hydraulic circuit provided for lubricating frictional surfaces between the bearing member and the camshaft. The first and second hydraulic circuits are separated from each other. The valve timing control system includes a directional control valve connected to the first hydraulic circuit for switching the direction of working fluid flowing through the first hydraulic circuit.

REFERENCES:
patent: 4231330 (1980-11-01), Garcea
patent: 4811698 (1989-03-01), Akasaka et al.
patent: 5058539 (1991-10-01), Saito et al.
patent: 5144921 (1992-09-01), Clos et al.

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