JPS61103586U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the vane pump according to the present invention, Figs. 2 and 3 are cross-sectional views taken along lines - and - of Fig. 1, and Fig. 4 shows the relationship between rotor rotational speed and discharge amount. Figure 5 is a diagram showing the relationship, and Figure 6 is a diagram showing the forces acting on the outer and inner peripheral surfaces of the rotor.
The figure is a sectional view similar to FIG. 3 showing another embodiment. 1a, 2a...Housing inner wall surface, 3...Housing, 4...Oil suction passage, 5...Oil discharge passage, 7...Ring, 10...Rotor, 11...Vane, 12...Oil discharge pressure introduction passage, 13...pump chamber, 24...rotor bearing section, 24b...outer peripheral surface of rotor bearing section, 25...concave groove.

Claims (1)

[Claims for Utility Model Registration] A housing having an oil suction passage and an oil discharge passage, a ring disposed within the housing, and an inner circumferential surface of the ring and an opposing surface of the housing sandwiching the ring from both sides. A rotor disposed in a space defined by two inner wall surfaces and driven to rotate around an axis eccentric to the center line of the ring; and a plurality of vanes whose radially outer ends are in sliding contact with the inner circumferential surface of the ring, and a pump chamber is defined by the inner circumferential surface of the ring, the outer circumferential surface of the rotor, and the vanes. The oil suction passage and the oil discharge passage are each communicated with the pump chamber existing region, and the rotor is a vane pump rotatably supported by a rotor bearing formed in the housing. A vane pump, characterized in that a groove is formed on the outer circumferential surface of the rotor bearing portion on the discharge path side, and the groove is configured to introduce oil discharge pressure.