Cartridge vane pump

Abstract

A cartridge vane pump includes a head pin that penetrates through a cover, a cover-side side plate and a cam ring that are fixed to an adapter. The head pin has a shaft portion that is fixed to the adapter at a tip end thereof, and a restricting portion that has a diameter larger than that of the shaft portion and being formed on a base end of the shaft portion. The cam ring, the cover, the cover-side side plate and a body-side side plate are held between the restricting portion and the adapter.

1 . A cartridge vane pump accommodated in a body of fluid pressure device in an attachable and detachable manner, the cartridge vane pump comprising:
 a rotor linked to a driving shaft, the rotor being configured to be rotationally driven;   a plurality of slits formed in a radiating pattern so as to have opening portions at an outer circumference of the rotor;   vanes respectively inserted into the slits in a freely slidable manner;   a cam ring configured to have an inner circumference cam face with which tip end portions of the vanes are brought into sliding contact;   pump chambers defined between the rotor, the cam ring, and the adjacent vanes;   a cover member brought into contact with one end surfaces of the rotor and the cam ring, the cover member being fixed to the body;   a side member brought into contact with other end surfaces of the rotor and the cam ring;   a pin configured to penetrate through the cam ring, the pin being supported at both end thereof by the cover member and the side member, and the pin being configured to prevent relative rotation of the cover member and the side member with respect to the cam ring; and   a joining member configured to penetrate through the cover member and the cam ring, the joining member being fixed to the side member, wherein   the joining member has a shaft portion and a restricting portion, the shaft portion being fixed to the side member at a tip end thereof, and the restricting portion being configured to have a diameter larger than that of the shaft portion and being formed on a base end of the shaft portion, and   the cam ring and the cover member are held between the restricting portion and the side member.   
     
     
         2 . The cartridge vane pump according to  claim 1 , wherein
 a gap is formed between the cover member and the restricting portion.   
     
     
         3 . The cartridge vane pump according to  claim 1 , wherein
 two joining members are provided at symmetrical positions centered around the driving shaft.