# US 5,702,242 A · Vane pump

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- Number: US 5,702,242 A
- Document ID: US5702242A
- Status: Granted
- Kind: A
- Application number: 08/429,417
- Filed: 1995-04-26
- Granted: 1997-12-30
- Earliest claimed: 1994-04-26
- Assignees: Luk Fahrzeug-Hydraulik GmbH & Co. KG
- Inventors: Thomas Nied-Menninger; Randolf Kortge; Bernd Denfeld
- Web page: https://patentgrep.com/patent/US5702242A

## CPC

- F04C 2/3446: {the inner and outer member being in contact along more than one line or surface}
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

A vane pump including a rotor, which is arranged within a cam ring located in the pump housing, and which carries a plurality of radially displaceable vanes which are also displaceable along the inner double-symmetrical contour of the cam ring, with the inner contour defining two diametrically opposite pump chambers and with each chamber being divided in three sections forming, respectively, a suction region, a pressure region, and a separation region between the suction and pressure regions.

## Claims

### Claim 1

A vane pump, comprising:
a housing;
a cam ring located in the housing and having an inner double-symmetrical contour defining two diametrically opposite pump chambers;
a rotor arranged within the inner contour of the cam ring; and
Six radially displaceable vanes supported on the rotor, spaced from each other by 60.degree., and displaceable along the inner contour of the cam ring during rotation of the rotor;
wherein the inner contour in a region of each pump chamber is divided in three sections, with a first section forming a suction region, a second section forming a pressure region, and a third section forming a separation region between the suction and pressure regions, and with each section occupying an angular region of 60.degree.,
wherein radial acceleration of a vane in the separation region is zero,
wherein the inner contour of the cam ring has two smooth regions defining chamber separation regions between the pressure region of one of the pump chambers and the suction region of another of the pump chambers, and the pressure region of the another of the pump chambers and the suction region of the one of the pump chambers, whereby no discontinuous change in a radial speed characteristic of a vane displacement, which is influenced by the inner contour of the cam ring, takes place, and
wherein the inner contour of the cam ring has no arcuate regions in the chamber separation regions, and a radial speed of a vane increases continuously in the chamber separation region from a maximum negative speed to a maximum positive speed.

### Claim 2 (depends on 1)

A valve pump as set forth in claim 1, wherein the radial speed in the chamber separation region in 0.degree. and 180.degree. positions of the vane is zero.

### Claim 3 (depends on 1)

A vane pump as set forth in claim 1, wherein a vane has a constant acceleration in the separation region between the suction and pressure regions of each chamber and in the chamber separation region.