Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1991-05-03
1992-06-02
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9031, F01L 134
Patent
active
051177846
ABSTRACT:
A modular control mechanism for shifting the phase or angular position of a camshaft or camshafts relative to a crankshaft in an internal combustion engine, and utilizing the energy produced by the reaction torque pulses on the camshaft, and resultant pressure pulses in the cavities, to provide a self-actuating system. In one embodiment, e.g. for controlling a single camshaft, the mechanism comprises two hydraulic cylindrical housings attached to either the camshaft flange or the camshaft driving sprocket, and a respective piston within each cylindrical housing and attached to the other flange to form a rotational hydraulic coupling. The hydraulic cylinders provide a pair of fluid chambers varying in displacement as the two flanges are rotated relative to one another. A hydraulic control apparatus regulates the flow of fluid between the hydraulic cylinders, thus controlling the phase shift between the crankshaft and camshaft. In another embodiment, the two hydraulic cylindrical housings are replaced with a single housing including a double acting piston. The control mechanism of the foregoing embodiments being limited to controlling a single camshaft and utilizing a dual planetary gear set for controlling the degree of phase shift.
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Schechter Michael M.
Simko Aladar O.
Cross E. Rollins
Drouillard Jerome R.
Ford Motor Company
Lo Weilun
May Roger L.
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