# US 2009/0260589 A1 · Device for variably adjusting the control times of gas-exchange valves of an internal combustion engine

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- Number: US 2009/0260589 A1
- Document ID: US20090260589A1
- Status: Published application
- Kind: A1
- Application number: 12/425,465
- Filed: 2009-04-17
- Published: 2009-10-22
- Earliest claimed: 2008-04-19
- Assignees: Schaeffler KG
- Inventors: Rainer OTTERSBACH; Juergen WEBER
- Web page: https://patentgrep.com/patent/US20090260589A1

## 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}
- F01L 1/024: {Belt drive}
- F01L 1/352: using bevel or epicyclic gear
- F01L 2001/0473: {Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod}
- F01L 2001/0476: {Camshaft bearings}
- F01L 2001/34469: {Lock movement parallel to camshaft axis}
- F01L 2303/00: Manufacturing of components used in valve arrangements
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES

## Abstract

A device for variably adjusting the control times of gas-exchange valves of an internal combustion engine. The device has a drive input element and a drive output element, The drive input element is placed in driving connection with a crankshaft of the internal combustion engine, the drive output element is arranged so as to be pivotable with respect to the drive input element, and the device is fastened to a camshaft which has a hollow shaft and an inner shaft which is arranged concentrically with respect to the hollow shaft. An improved mounting arrangement of the concentrically arranged shafts with respect to one another is proposed.

## Claims

### Claim 1

A device for variably adjusting control times of gas-exchange valves of an internal combustion engine, having:
a drive input element and at least one drive output element,
the drive input element being placed in driving connection with a crankshaft of the internal combustion engine,
the drive output element being arranged so as to be pivotable with respect to the drive input element, and
the device being fastened to a camshaft comprising at least one hollow shaft and an inner shaft arranged concentrically with respect to the hollow shaft,
wherein two radial bearing points are formed on the drive output element or the drive input element,
with a first radial bearing point being provided for mounting the hollow shaft and a second radial bearing point being provided for mounting the inner shaft.

### Claim 2 (depends on 1)

The device according to claim 1, the first radial bearing point and the second radial bearing point are formed on the drive output element.

### Claim 3 (depends on 1)

The device according to claim 1, wherein the first radial bearing point and the second radial bearing point are formed on an inner lateral surface of the drive output element or the drive input element.

### Claim 4 (depends on 3)

The device according to claim 3, wherein the inner lateral surface has a first cylindrical region and a second cylindrical region of different diameters, with the first radial bearing point being formed on the first cylindrical region and the second radial bearing point being formed on the second cylindrical region.

### Claim 5 (depends on 1)

The device according to claim 1, wherein a third radial bearing point is formed on the drive input element, the third radial bearing point is provided for mounting the hollow shaft or the inner shaft.