Valve actuating apparatus
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYoshio Ajiki, Masaaki Matsuura
Life of this patent
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Abstract
A valve actuating apparatus for an internal combustion engine having selectively energizable intake/exhaust valves. Oil is supplied to valve actuators which perform the selective energization of the valve through a spool valve. The spool valve has a bypass for supplying operating oil to the actuators when the spool valve is set to the unenergized position in an amount insufficient for energizing the actuators but sufficient to purge air from the lines connecting the spool valve to the actuators. By so doing, the responsiveness of the actuator system is improved.
Claims8
A valve actuating apparatus for an internal combustion engine, comprising:
- at least one valve actuator for selectively engaging and disengaging the operation of at least one corresponding valve of said engine in accordance with the pressure of operating oil supplied thereto;
- and
- a spool valve connected through an oil line between said valve actuator and a pressurized source of operating oil for controlling said pressure of said operating oil supplied to said valve actuator, said spool valve having a spool movable between a first position wherein a quantity of operating oil sufficient for energizing said actuator is supplied to said actuator and a second position where the quantity of operating oil supplied to said valve actuator is insufficient for energizing said actuator, said spool valve having a bypass for supplying to said actuator in said second position of said spool in a quantity insufficient for energizing said actuator but sufficient to purge air from a portion of said oil line connecting said spool valve to said actuator.
Dependencies are inferred from the claim text.