JPH0411288U

JPH0411288U -

Info

Publication number: JPH0411288U
Application number: JP5169290U
Authority: JP
Priority date: 1990-05-17
Filing date: 1990-05-17
Publication date: 1992-01-30

Description

[Brief explanation of the drawing]

第１図および第２図は本考案の一実施例を示し
、第１図はカムリングの横断面図で、第２図の
−線に沿う断面図、第２図はポンプ部の断面図
、第３図および第４図は従来例を示し、第３図は
カムリングの横断面図で、第４図の−線に沿
う断面図、第４図はポンプ部の断面図である。１……ロータ、２……ベーン、３……カムリン
グ、３１……支軸、３２Ａ，３２Ｂ，３３Ａ，３
３Ｂ……凹溝、４１……吸入ポート、４２……吐
出ポート、５……膜層、Ｐ……ポンプ室。 1 and 2 show an embodiment of the present invention, FIG. 1 is a cross-sectional view of the cam ring, a sectional view taken along the - line in FIG. 2, and FIG. 2 is a sectional view of the pump section. 3 and 4 show a conventional example, in which FIG. 3 is a cross-sectional view of a cam ring, a cross-sectional view taken along the - line in FIG. 4, and FIG. 4 is a cross-sectional view of a pump section. 1... Rotor, 2... Vane, 3... Cam ring, 31... Support shaft, 32A, 32B, 33A, 3
3B...Concave groove, 41...Suction port, 42...Discharge port, 5...Membrane layer, P...Pump chamber.

Claims

[Scope of utility model registration request]

A plurality of vanes protruding outward in the radial direction are provided at equal intervals on the outer periphery of the rotor, and a cam ring that can swing around a support shaft provided at one location on the outer periphery is arranged on the outer side of the rotor. and bring the tips of each of the vanes into contact with the inner circumferential surface of the cam ring, and
A housing wall is brought into contact with both sides of each vane and the cam ring to form a closed pump chamber between each vane, and fluid is sequentially sucked into each pump chamber from the suction port provided on the housing wall. Fluid is sequentially discharged from the pump chamber to a discharge port provided on the housing wall, and discharge pressure is applied to the outer surface of approximately half the circumference of the cam ring, so that the cam ring is oscillated from an eccentric position to a concentric position in accordance with the discharge pressure. In the variable displacement vane pump, the discharge flow rate is adjusted by adjusting the discharge flow rate, both sides of the cam ring that contact the housing wall are covered with a film layer made of a material with a stable coefficient of friction, and each of the both sides of the cam ring is coated with a film layer made of a material with a stable friction coefficient. A variable displacement vane pump characterized in that grooves of the same shape are formed along the suction port and the discharge port.