JPS61164484U - - 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. 5 is a plan view showing the rotor alone in FIG. 1, FIG. 6 a is a sectional view of the rotor taken along the line in FIG. Figure 6c is a diagram showing the oil pressure acting on the lower surface of the rotor in Figure 6a, and Figures 7a, b, and c are for the case where the groove widths of both circumferential grooves are the same. Figure 6 a, b in
, c. 1a, 2a...Housing inner wall surface, 3...Housing, 4...Oil suction passage, 5...Oil discharge passage, 7...
Ring, 10...Rotor, 10d...Radial groove, 1
0e, 10f...Circumferential groove, 10g...Rotor inner peripheral surface, 11...Vane, 12...High pressure oil introduction path, 1
3...Pump chamber, 24a...Bearing surface.

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 respectively communicated with the pump chamber existing region, and the rotor is provided with a plurality of radial grooves for accommodating the vanes, and a plurality of radial grooves are formed on both sides of the rotor. are each formed with a circumferential groove, at least one circumferential groove communicates with said radial groove and both circumferential grooves communicate with each other, and high pressure oil is introduced into each of said grooves; On the inner peripheral side of the rotor between one side of the rotor and the inner wall surface of the housing facing the one side, the high-pressure oil flows directly into the drain passage, and the high-pressure oil flows directly into the drain passage between the other side of the rotor and the inner wall of the housing facing the other side. The vane pump is a vane pump in which the high-pressure oil flows out into the drain passage through between the inner circumferential surface of the rotor and a bearing surface that is in close contact with the inner circumferential surface of the rotor, and the vane pump is formed on one side surface of the rotor. A vane pump characterized in that a circumferential groove width formed on the other side surface is set wider than a circumferential groove width formed on the other side surface.