초록 ▼

A device for varying a valve timing and lift for an internal combustion engine comprises a first valve lifter and a second valve lifter, and an oil pressure chamber being defined between the first valve lifter and the second valve lifter. The flow of oil from the oil pressure chamber is continuously

A device for varying a valve timing and lift for an internal combustion engine comprises a first valve lifter and a second valve lifter, and an oil pressure chamber being defined between the first valve lifter and the second valve lifter. The flow of oil from the oil pressure chamber is continuously and steplessly controlled through a high-speed response control valve in an oil extraction passage. While the oil is being removed, the valve does not lift. When the high-speed response control valve is closed, the first valve lifter and the second valve lifter move together and the valve begins to lift. By controlling the action of the actuator of the high-speed response control valve, the valve timing and lift of the poppet valve can be controlled to the optimum ones matching the engine operating conditions.

대표청구항 ▼

A device for varying valve timing and lift comprising: a first valve lifter movable along an axis and adapted to contact a valve; a second valve lifter, adapted to contact a cam, movable along ssaid axis, said first and second valve lifters defining a pressure chamber therebetween; first means for p

A device for varying valve timing and lift comprising: a first valve lifter movable along an axis and adapted to contact a valve; a second valve lifter, adapted to contact a cam, movable along ssaid axis, said first and second valve lifters defining a pressure chamber therebetween; first means for providing a pressure in said pressure chamber, a sole source of pressure to said pressure chamber being by supplying oil to an inlet portion of said pressure chamber; and second means, coupled to an outlet portion different from said inlet portion, of said pressure chamber, for selectively relieving pressure in said pressure chamber; and high speed actuator means for controlling said pressure relieving of said second means, including: check ball valve means for selectively blocking said second means, and actuator means for directly opening said check ball valve means, said check ball valve means disposed so that pressure of said oil closes said check ball valve means. A method of controlling a valve, comprising the steps of: transferring motion from a cam to a first valve lifter; transferring motion from a second valve lifter to said valve; controlling the volume of a pressure chamber defined between said first and second valve lifters which has independent inlet and outlet paths, by supplying a pressurized oil into said pressure chamber, through said inlet path and selectively commanding a check ball valve in said outlet path to open against said oil pressure, said check ball valve disposed so that said oil pressure would normally close said check ball valve; selectively opening said check ball valve by transmitting force from an actuator to said check ball valve; using only said oil pressure as controlled by said check ball valve to apply a force to said second valve lifter.