Valve operation control system
AssigneeAisin Seiki Kabushiki Kaisha
InventorsYasushi Miura, Kongo Aoki
Life of this patent
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Abstract
A valve operation control system for an internal combustion engine having a cam-shaft and a crank-shaft has an adjusting device for adjusting a phase difference between the cam-shaft and the crank-shaft by being supplied with hydraulic pressure, a driving device integrated with the adjusting device and having an oil pump driven by the cam-shaft and a hydraulic pressure line between the oil pump and the adjusting device, and a hydraulic pressure control device disposed in the hydraulic pressure line for regulating the hydraulic pressure to be supplied to the adjusting device.
Claims4
A valve operation control system for an internal combustion engine having a cam-shaft and a crank-shaft, comprising:
- a timing gear driven by the crank-shaft;
- a transmitting member connected to the cam-shaft;
- and
- means for adjusting a phase difference between the cam-shaft and the crank-shaft, the means for adjusting including a pump having an inlet port and an outlet port, a pressure chamber disposed between the inlet port and the outlet port of the pump, a piston associated with the timing gear and the transmitting member in such a manner that movements of the piston in opposite directions respectively establish an increase and a decrease of the phase difference between the cam-shaft and the crank-shaft, one side of the piston being exposed to the pressure chamber, biasing means for biasing the piston toward the pressure chamber, a passage provided between the inlet port and outlet port of the pump and bypassing the pressure chamber, and control means for opening and closing the passage.
Dependencies are inferred from the claim text.