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US 9,518,581 B2Granted
Vane pump including shaft fitting concave not to be penetrated
AssigneeMitsubishi Electric Corporation
InventorSatoshi Nakagawa
Life of this patent
Estimating the term…
Abstract
A shaft is fitted in a shaft fitting concave part to provide a structure such that no shaft penetrates through a rotor, so that an inner space (shaft fitting concave part, and hollow parts) and an outer space (pump chamber) of the rotor are made independent. The inner space of the rotor 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 of the rotor slides on an inner wall surface of a rotor housing part with pressed against this inner wall surface by a pressure difference.
Claims7
A vane pump comprising:
- a first housing having a rotor housing that houses a rotor, an intake port, and a shaft through-hole through which a motor shaft is penetrated to the rotor housing;
- a second housing having a discharge port that allow the rotor housing to communicate with outside;
- a cylindrical rotor that is housed in the rotor housing eccentrically to a center of the rotor housing 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,
- wherein the rotor has a shaft fitting concave in which an end portion of the motor shaft that penetrates through the shaft through-hole is fitted, and the shaft fitting concave 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.
3 more elements
Dependencies are inferred from the claim text.