Cartridge vane pump and pump device including same

A pump device comprising:

• a cartridge vane pump;
• and a body attachably and detachably accommodating the cartridge vane pump, wherein the cartridge vane pump includes:
• a rotor linked to a driving shaft, the rotor being configured to be rotationally driven;
• a plurality of vanes provided in the rotor so as to be reciprocable in a radial direction of the rotor;
• a cam ring having an inner circumferential cam surface with which the plurality of vanes are brought into sliding contact with rotation of the rotor;
• a plurality of pump chambers provided in the cam ring, between an outer circumferential surface of the rotor and the inner circumferential cam surface of the cam ring, each of the plurality of pump chambers being defined by an adjacent two of the plurality of vanes;
• a side member having a first end surface that abuts on first end surfaces of the rotor and the cam ring;
• a cover member abutting on second end surfaces of the rotor and the cam ring, the cover member being attached to the body;
• a first pressure chamber provided between the body and the cam ring;
• a second pressure chamber provided between the body and the side member;
• and a sealing member provided on an outer circumferential surface of the side member, between the first pressure chamber and the second pressure chamber, the sealing member sealing a gap between the outer circumferential surface of the side member and an inner circumferential surface of the body so that a working fluid does not flow between the first pressure chamber and the second pressure chamber through the gap, and the side member includes:
• a suction port for guiding the working fluid into the pump chambers, the suction port extending through the first end surface of the side member and the outer circumferential surface of the side member and connecting the pump chambers to the first pressure chamber;
• a first restricting portion configured to restrict movement of the sealing member towards a first side of the side member where the rotor is disposed;
• a second restricting portion configured to restrict movement of the sealing member towards a second side opposite to the first side of the side member;
• and an accommodating space defined by the first restricting portion and the second restricting portion, the sealing member being accommodated in the accommodating space, and the first restricting portion has a flange protruding radially outward from the outer circumferential surface of the side member, the flange having an outer diameter that is larger than an outer diameter of the second restricting portion so as to compress the sealing member with the body in an axial direction of the driving shaft.