# US 11,441,561 B2 · Vane pump

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- Number: US 11,441,561 B2
- Document ID: US11441561B2
- Status: Granted
- Kind: B2
- Application number: 16/935,307
- Filed: 2020-07-22
- Published: 2021-01-28
- Granted: 2022-09-13
- Earliest claimed: 2019-07-26
- Assignees: Hanon Systems Efp Deutschland GmbH
- Applicants: Hanon Systems Efp Deutschland GmbH
- Inventors: Dirk Borchers; Thomas Dippel; Rolf Popelka
- Web page: https://patentgrep.com/patent/US11441561B2

## CPC

- F04C 2/3446: {the inner and outer member being in contact along more than one line or surface}
- F04C 2/344: with vanes reciprocating with respect to the inner member
- F04C 15/0003: {Sealing arrangements in rotary-piston machines or pumps (sealing in general F16J)}
- F04C 15/0023: {Axial sealings for working fluid}
- F04C 2210/206: Oil
- F04C 2230/60: Assembly methods
- F04C 2240/805: Fastening means, e.g. bolts
- 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 has a pump flange, a cam ring, a pressure plate and at least one pin extending axially through the pump flange, the cam ring and the pressure plate, the pin being preloaded in an axial direction thereof by means of at least one spring element.

## Claims

### Claim 1

A vane pump having a pump flange, a cam ring, a pressure plate as well as at least one pin extending axially through the pump flange, the cam ring and the pressure plate, the pin being preloaded in an axial direction thereof by at least one spring element, wherein the pin has a pin flange, and the spring element is disposed between the pin flange and the pump flange or, the spring element is on one side supported by the pin flange, and on the other side by the pump flange, the axial preload on the pin being based on the spring element being compressed between the pin flange and the pump flange, wherein the pressure plate includes a first side facing the cam ring and an opposite second side, the vane pump further including a retainer coupling the pin to the second side of the pressure plate to react the axial preload.

### Claim 2 (depends on 1)

The vane pump according to claim 1, wherein the spring element is a disc spring or cup spring.

### Claim 3 (depends on 1)

The vane pump according to claim 1, wherein one end of a pump shaft is enclosed by the pressure plate.