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

1992-08-31

1993-04-13

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 464 2, 74568R, F01L 134

Patent

active

052012891

ABSTRACT:
A valve timing control system includes a timing sprocket, a camshaft, a sleeve secured to the camshaft and accomodated within the timing sprocket. A helical piston assembly and a floating piston are movably disposed in an annular space between the timing sprocket and the sleeve. An end plug is disposed at one end of the timing sprocket to close one end of the annular space. First and second chambers are defined between the floating piston and the end plug and between the floating piston and the helical piston assembly, respectively. A valve spool is operatively connected to an actuator and movably disposed in the sleeve. The valve spool moves among first, second and third positions. At the first position, the first and second chambers are drained. At the second position, the first chamber is communicated with a hydraulic fluid pump and the second chamber is drained. At the third position, the first and second chambers are communicated with the hydraulic fluid pump.

REFERENCES:
patent: 4535731 (1985-08-01), Banfi
patent: 4787345 (1988-11-01), Thoma
patent: 4895113 (1990-01-01), Speier et al.
patent: 5012774 (1991-05-01), Strauber et al.
patent: 5088456 (1992-02-01), Suga
patent: 5138985 (1992-08-01), Szodfridt et al.

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