PURPOSE: To enable use of a large-diameter suction valve by providing a rotor, stored in a cam housing and forming plunger chambers, a suction valve, provided in the same axis as the plunger chamber, and a delivery valve, provided in a delivery line formed from the side wall of the plunger chamber to the center of the rotor.
CONSTITUTION: Multiple plunger chambers 4 are formed axially in a rotor 2 stored free to rotate in a cam housing 1, and multiple plungers 5 are stored free to slide in the chamber 4 through a return spring 8B. A suction valve 7 is provided at the bottom of the chamber 4 in the same axis as the chamber 4 and a delivery valve 11 is provided in a delivery line 10 opened to the side wall of the chamber 4 and formed toward the center of the rotor 2. By this, the suction valve 7 can be increased in diameter even when a coupling is small and, as a result, sufficient amount of hydraulic oil can be sucked. Also, since a plug 9 for holding the return spring 8A of the suction valve 7 is held by a spring 8B, the working accuracy of the plug 9 and the chambers 4 can be lowered.
INA HIDEAKI
TAKADA MASAHIRO
IZUMI HISASHI
