JP-2026075925-A - vane pump

JP2026075925AJP 2026075925 AJP2026075925 AJP 2026075925AJP-2026075925-A

Abstract

[Problem] To provide a vane pump that can reduce the sliding resistance of the rotor by ensuring a gap between the side plate and the rotor. [Solution] The vane pump 100 according to the present invention comprises a rotor 102 rotatable around an axis 110, a plurality of vane grooves 108 formed radially on the outer circumferential surface of the rotor, a plurality of vanes 106 fitted into the plurality of vane grooves and slidably protruding from the rotating rotor, two side plates 114, 116 arranged on both sides of the rotor and facing the side surface of the rotor, and back pressure grooves 132, 134, 142, 144 formed on the side plates, which are able to communicate with the axis side of the vane grooves of the rotor and through which discharge pressure is guided, and the two side plates have continuous annular protrusions 152, 154 formed on the sliding surfaces 122, 146 facing the rotor and located on the axis side of the back pressure grooves. [Selection Diagram] Figure 1

Inventors

下口保
長浜敬則

Assignees

株式会社不二越

Dates

Publication Date: 20260511
Application Date: 20241023

Claims (3)

A rotor that can rotate around its axis, Multiple vane grooves are formed radially on the outer circumferential surface of the rotor, Multiple vanes fitted into the aforementioned multiple vane grooves and slidably protruding from the rotating rotor, The rotor is positioned on both sides and consists of two side plates facing the sides of the rotor, The side plate is formed and is capable of communicating with the axial side of the vane groove of the rotor, and includes a back pressure groove through which the discharge pressure is guided, A vane pump characterized in that the two side plates or the rotor have continuous or discontinuous annular protrusions formed on the sliding surfaces with the opposing mating surface, and located on the axial side of the back pressure groove.
The vane pump according to claim 1, characterized in that the aforementioned protrusions are formed by coating or plating.
The sliding surface has an annular groove formed therein. The vane pump according to claim 1, characterized in that the protrusion is formed by fitting a shim ring or a ring-shaped elastic body into the groove such that it protrudes from the groove.

Description

This invention relates to a vane pump used as a hydraulic pump for a continuously variable transmission (CVT) in an automobile, and as a lubrication and cooling pump for an electric vehicle (EV). A vane pump comprises a rotor rotatable around an axis, a cam ring, and multiple vanes. The rotor is housed within the cam ring, and multiple vane grooves are radially formed on its outer surface. The multiple vanes are fitted into the vane grooves and slidably protrude from the rotating rotor. The rotor also has a vane back pressure chamber formed on the axial side (inside) of the vane grooves, which directs back pressure to the vanes. The vanes, driven by centrifugal force from the rotor's rotation and back pressure directed into the rotor's vane back pressure chamber, protrude radially from the rotor and slide along the inner surface of the cam ring. This allows the vane pump to perform its pumping action through volume changes in the pump chamber, which is partitioned by adjacent vanes, the rotor, and the cam ring (see, for example, Patent Document 1). The vane pump described in Patent Document 1 has side plates that form the side walls of the pump chamber, and discharge pressure is directed to the back of the side plates to create back pressure. Furthermore, the side plates are provided with orifices that lead to the vane back pressure chambers of the rotor. As a result, the discharge pressure directed to the back of the side plates is guided to the vane back pressure chambers of the rotor via the orifices. Therefore, if there is an oil leak between the rotor and the side plate, a differential pressure corresponding to the amount of leakage (the amount of leakage in the pump chamber) will be generated before and after the orifice, and this differential pressure will press the side plate against the rotor. As a result, in the vane pump described in Patent Document 1, the force (pressure force) that the side plates exert on the rotor changes according to the differential pressure, ensuring that the pressure force of the side plates is neither excessive nor insufficient in accordance with the leakage rate of the pump chamber. Japanese Patent Application Publication No. 6-58266 This is a schematic diagram showing a cross-section of a vane pump in an embodiment of the present invention.This diagram shows the main components of the vane pump shown in Figure 1.This is a schematic diagram illustrating the principle by which a rotor moves due to pressure balance.Figure 1 is a schematic diagram illustrating the behavior of the rotor when it is shifted to one side plate. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely illustrative to facilitate understanding of the invention and, unless otherwise specified, do not limit the present invention. In this specification and the drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations. Figure 1 is a schematic diagram showing a cross-section of the vane pump 100 in an embodiment of the present invention. Figure 2 is a diagram showing the main parts of the vane pump 100 in Figure 1. The vane pump 100 is used as a hydraulic pressure generating pump for continuously variable transmissions (CVTs) in automobiles, and as a lubrication and cooling pump for electric vehicles (EVs). The vane pump comprises a rotor 102, a cam ring 104, and a plurality of vanes 106 (see Figure 2(a)). Figure 2(a) is a cross-sectional view of the vane pump 100 in Figure 1, taken along line A-A. The rotor 102 is housed within the cam ring 104, and as shown in Figure 2(a), a plurality of vane grooves 108 are radially formed on its outer circumferential surface. The rotor 102 is also rotatable around the shaft 110. The multiple vanes 106 are fitted into multiple vane grooves 108 of the rotor 102, allowing them to move in and out radially from the rotor 102, and slidably protruding from the rotating rotor 102. As a result, the multiple vanes 106 rotate along the inside of the cam ring 104, moving in and out toward the cam ring 104 as the rotor 102 rotates. Furthermore, the rotor 102 has a vane extrusion chamber (vane back pressure chamber 112). The vane back pressure chamber 112 is formed on the shaft 110 side (inside) of the vane groove 108 and guides back pressure to the vane 106. Furthermore, the vane pump 100 is equipped with two side plates 114 and 116 (see Figure 1). The side plates 114 and 116 have a roughly disc shape and, as shown in Figure 1, are positioned on both sides of the rotor 102, facing the sliding surfaces 118 and 120, which are the sides of the rotor 102. Figure 2(b) shows the side surface 122 of the side plate 114 facing the rotor 10