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

1991-10-30

1992-09-29

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, F01L 134

Patent

active

051506718

ABSTRACT:
An intake- and/or exhaust-valve timing control system for an internal combustion engine comprises a ring gear disposed between a cam sprocket having a driven connection with an engine crankshaft and a camshaft for adjusting the phase angle between the cam sprocket and the camshaft. A drive mechanism is also provided for drivingly controlling the ring gear via fluid pressure depending upon the operating state of the engine. The drive mechanism includes a first hydraulic circuit for creating one axial movement of the ring gear in one axial direction of the camshaft and a second hydraulic circuit for creating the other axial movement of the ring gear in the opposing axial direction of the camshaft, a two-position spool valve coaxially disposed in the front end of the camshaft for selectively switching from one of the first and second hydraulic circuits to the other. The fluid pressure control valve is also provided for generating a control fluid pressure depending upon the operating state of the engine to remotely control the spool valve via the control fluid pressure.

REFERENCES:
patent: 4787345 (1988-11-01), Thoma
patent: 4895113 (1990-01-01), Speier et al.
patent: 4903650 (1990-02-01), Ohlendorf et al.
patent: 5012774 (1991-05-01), Strauber et al.
patent: 5058539 (1991-10-01), Saito et al.

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