Valve timing control system for internal combustion engine

Details Valve timing control system for internal combustion engine Valve timing control system for internal combustion engine

Filed on

1992-11-27

Date issued

1994-05-10

Examiner

Cross, E. Rollins

Patent Class

Internal-combustion engines

SubClass

Poppet valve operating mechanism

SubSubClass

With means for varying timing

Other Related Categories

123 9031, 464 2, F01L 134

Type

Patent

Status

active

Patent number

053098730

Description

ABSTRACT:
A valve timing control system for an internal combustion engine is provided. This system comprises a sprocket assembly connected to a crankshaft of the engine, a camshaft assembly connected to the sprocket assembly for driving intake and/or exhaust valves of the engine, a ring gear assembly disposed between the sprocket assembly and the camshaft assembly, and a fluid power source for providing fluid pressure to a pressure chamber to axially displace the ring gear assembly to vary a phase angle relation over a range of first to second phase angles. A fluid pressure supply and drain lines are defined in the system which communicates between the fluid power source and the pressure chamber and between the pressure chamber and a drain port of the system respectively. The system further includes a solenoid operated directional control valve which is responsive to a control signal from a controller to selectively block the fluid pressure supply or drain lines according to variation in engine operating conditions for varying the valve timing.

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