# US 8,739,749 B2 · Non-return valve for camshaft adjusters with oil reservoirs

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- Number: US 8,739,749 B2
- Document ID: US8739749B2
- Status: Granted
- Kind: B2
- Application number: 13/739,279
- Filed: 2013-01-11
- Published: 2013-08-08
- Granted: 2014-06-03
- Earliest claimed: 2012-02-02
- Assignees: Schaeffler Technologies AG & Co. KG
- Applicants: Schaeffler Technologies AG & Co. KG
- Inventors: Michael Busse
- Web page: https://patentgrep.com/patent/US8739749B2

## CPC

- F01L 1/344: changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L 1/3442: {using hydraulic chambers with variable volume to transmit the rotating force}
- F16K 15/023: {the valve member consisting only of a predominantly disc-shaped flat element}
- F16K 15/06: with guided stems
- F01L 2001/34446: {Fluid accumulators for the feeding circuit}
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A camshaft adjuster (4) for a camshaft (12) of an internal combustion engine (2). The camshaft adjuster (4) includes a stator (20), a rotor (22) accommodated concentrically in the stator (20) and rotatable with respect to the stator (20) about an axis of rotation (78), and a volume reservoir (70) for receiving a hydraulic fluid from a pressure chamber (44) formed between the rotor (22) and the stator (20), wherein the volume reservoir (70) has an outlet (76) in a direction of the axis of rotation (78).

## Claims

### Claim 1

A non-return valve for closing a channel between a volume reservoir and a pressure chamber in a camshaft adjuster, comprising a cover for closing the channel on a pressure chamber side and a fluid-permeable supporting element that is insertable into the channel and projects axially from the cover to support the cover radially in the channel.

### Claim 2 (depends on 1)

The non-return valve as claimed in claim 1, wherein the supporting element comprises at least two rods spaced apart axially.

### Claim 3 (depends on 2)

The non-return valve as claimed in claim 2, wherein, at ends of the rods opposite to the cover, viewed outward from a center of the cover, there are formed radially outwardly directed hooks for insertion into the volume reservoir.

### Claim 4 (depends on 2)

The non-return valve as claimed in claim 2, wherein the rods are radially resilient.

### Claim 5 (depends on 1)

A rotor for a camshaft adjuster comprising a hub, at least one vane projecting radially from the hub and having a volume reservoir formed in the vane which, via a channel running circumferentially through the vane to the hub, as viewed outward from the volume reservoir, is open to outside, and a non-return valve as claimed in claim 1 located in the channel from outside, as viewed outward from the volume reservoir.

### Claim 6 (depends on 5)

The rotor as claimed in claim 5, wherein a distance between the cover and the hook is greater than a length of the channel.

### Claim 7 (depends on 5)

The rotor as claimed in claim 5, wherein the rods of the supporting element bear on a wall of the channel.

### Claim 8 (depends on 5)

The rotor as claimed in claim 5, wherein an outwardly directed opening of the channel, viewed outward from the volume reservoir, is chamfered.

### Claim 9 (depends on 5)

The rotor as claimed in claim 5, wherein the vane in a region of an outwardly directed opening of the channel has a depression oriented in a peripheral direction, in which the cover of the non-return valve can be accommodated.

### Claim 10 (depends on 5)

A camshaft adjuster for adjusting a phase change between a crankshaft and a camshaft of an internal combustion engine, comprising a stator for receiving rotational energy from the crankshaft and a rotor as claimed in claim 5, rotatably mounted with respect to the stator, for transferring the rotational energy to the camshaft.