VANE PUMP

摘要

A shaft 26 is fitted in a shaft fitting concave part 21a to provide a structure such that no shaft 26 penetrates through a rotor 21, so that an inner space (shaft fitting concave part 21a, and hollow parts 21c) and an outer space (pump chamber 34) of the rotor 21 are made independent. The inner space of the rotor 21 is communicated with outside to be at a low pressure, and the outer space is at a high pressure due to gas compression, and an upper surface 21d of the rotor 21 slides on an inner wall surface of a rotor housing part 28 with pressed against this inner wall surface by a pressure difference.

主权项

1. A vane pump comprising:
a housing in which there are formed a cylindrical rotor housing part, an intake port and a discharge port that allow the rotor housing part to communicate with outside, and a shaft through-hole through which a motor shaft is penetrated to the rotor housing part; a cylindrical rotor that is housed in the rotor housing part eccentrically to a center of the rotor housing part and that rotates integrally with the motor shaft; and vanes that are installed in the rotor, movable outward in a radial direction by receiving rotation force of the rotor, and rotates in sliding contact with an inner peripheral surface of the rotor housing part, wherein the rotor has a shaft fitting concave part in which an end portion of the motor shaft that penetrates through the shaft through-hole is fitted, and the shaft fitting concave part is formed on a surface of the rotor that faces the motor shaft, not permitting penetration to the opposite side of the surface of the rotor that faces the motor shaft.