Cartridge vane pump

Abstract

The cartridge vane pump includes a first connection channel that connects a first discharge port and a first discharge channel and a second connection channel that connects a second discharge port and a second discharge channel. An O-ring is provided on an outer circumference of a circular tube portion, the O-ring blocks communication between the first connection channel and the second connection channel.

1 . A cartridge vane pump accommodated in an accommodating concave portion formed in a body of a 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 plate brought into contact with other end surfaces of the rotor and the cam ring;   first and second discharge ports formed in the side plate, the first and second discharge ports being configured such that working fluid discharged from the pump chambers is guided thereinto; and   an adapter formed with connection channels for respectively connecting the first and second discharge ports formed in the side plate and first and second discharge channels formed in the body, wherein   the adapter has
 a main body portion configured to have a contact surface and an annular surface, the contact surface being brought into contact with the side plate, and the annular surface being configured to face a bottom surface of the accommodating concave portion and 
 a circular tube portion configured to have a diameter smaller than that of the main body portion, the circular tube portion being configured to extend from the main body portion in an axial direction, and the circular tube portion being fitted into the accommodating concave portion, 
   the connection channels have
 a first connection channel formed between the contact surface and the annular surface so as to penetrate through the main body portion, the first connection channel being configured to connect the first discharge port and the first discharge channel and 
 a second connection channel formed so as to penetrate through the main body portion and so as to communicate with an internal space of the circular tube portion, the second connection channel being configured to connect the second discharge port and the second discharge channel, and 
   a seal member is provided on an outer circumference of the circular tube portion, the seal member being configured to block communication between the first connection channel and the second connection channel.   
     
     
         2 . The cartridge vane pump according to  claim 1 , wherein
 the main body portion is formed to have a circular plate shape, and   the main body portion and the circular tube portion are formed coaxially.