PURPOSE: To simplify both inlet and discharge valves in structure by installing a valve element, provided with plural units of inlet ports and discharge, in a rotor member, and constituting it to produce flow resistance in space between a high pressure chamber interconnected to these discharge ports and a low pressure chamber in a joint.
CONSTITUTION: When a rotational difference is produced in an internal between a cam 1 and a rotor 4, a plunger 6 is pressed in the axial direction by a cam surface 2. Therefore the plunger 6 forces out oil in a plunger chamber 5 to a high pressure chamber 16 via a rotary valve 10, a discharge port 12A and a discharge passage 12B, while an inlet-discharge combined port 8 is closed by the rotary valve 10. A flow resistance of oil is produced by an orifice 18 lying between the high pressure chamber 16 and a low pressure chamber 20 and thereby reaction is produced in the plunger 6 as well, so that torque is transferred to an interval between the cam 1 and the rotor 4. When the plunger 6 comes to an inlet stroke, oil in the low pressure chamber 20 is taken into the plunger chamber 5 by way of an inlet passage 11B and an inlet port 11A of the rotary valve 10. Owing to the said constitution, both inlet and discharge valves are simplified in terms of structure.
INA HIDEAKI
YAMADA TAKEHISA
