# US 9,518,880 B2 · Method for producing a magnet unit for a sensor device of a motor vehicle, magnet unit, sensor device and motor vehicle

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- Number: US 9,518,880 B2
- Document ID: US9518880B2
- Status: Granted
- Kind: B2
- Application number: 14/781,971
- Filed: 2014-02-24
- Published: 2016-02-25
- Granted: 2016-12-13
- Earliest claimed: 2013-04-05
- Assignees: Valeo Schalter und Sensoren GmbH
- Applicants: VALEO Schalter und Sensoren GmbH
- Inventors: Roman Schoepe; Ekkehart Froehlich
- Web page: https://patentgrep.com/patent/US9518880B2

## CPC

- G01L 3/104: {involving permanent magnets}
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

The invention relates to a method for producing a magnet unit (1) for a sensor device for detecting a measured variable which characterizes a rotational state of a steering shaft of a motor vehicle, by way of provision of an annular magnet element (3), provision of a sleeve (2) for connecting the magnet unit (1) to a shaft part of the steering shaft, and connection of the magnet element (3) to the sleeve (2), the sleeve (2) being configured with a main body (6) and a multiplicity of tabs (7) which protrude from the main body (6), and the connection comprising the tabs (7) being embedded into respective cut-outs (5) of the magnet element (3) with heating of the magnet element (3).

## Claims

### Claim 1

A method for producing a magnet unit for a sensor device for detecting a measured variable that characterizes a rotational state of a steering shaft of a motor vehicle, comprising:
connecting an annular magnet element to a sleeve, the sleeve being for connecting the magnet unit to a shaft part of the steering shaft,
wherein the sleeve is configured with a main body and a plurality of tabs that protrude from the main body, and the connection comprises the tabs being embedded into respective cut-outs of the magnet element with heating of the magnet element, and
wherein at least one axial edge of each tab of the plurality of tabs is configured with a tooth structure.

### Claim 2 (depends on 1)

The method according to claim 1, wherein as a result of the heating, the magnet element is melted within the cut-outs and, and as a result, a positively locking connection is formed between the tabs on one side and the magnet element on the other side.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the tabs protrude from the main body in the axial direction and are received into the respective cut-outs in the axial direction.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the cut-outs are formed by slot-like, axial pockets which are configured on an axial end side of the magnet element.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the heating is carried out by way of loading of the magnet element and/or the sleeve with ultrasound.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the heating comprises the tabs first of all being heated, in particular inductively and/or by means of a heated punch, and then being embedded into the respective cut-outs.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the sleeve is configured in one piece.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the sleeve is made from metal.

### Claim 9 (depends on 1)

The method according to claim 1, wherein the magnet element is made from filled plastic.

### Claim 10

A magnet unit for a sensor device for detecting a measured variable that characterizes a rotational state of a steering shaft of a motor vehicle, the magnet unit comprising:
an annular magnet element and a sleeve, which is connected to the magnet element, and via which the magnet unit can be connected to a shaft part of the steering shaft,
wherein the sleeve has a main body and a plurality of tabs that protrude from the main body and are embedded into respective cut-outs of the magnet element in a positively locking manner, and
wherein at least one axial edge of each tab of the plurality of tabs is configured with a tooth structure.

### Claim 11 (depends on 10)

A sensor device for detecting a measured variable which characterizes a rotational state of a steering shaft of a motor vehicle, comprising the magnet unit according to claim 10.

### Claim 12 (depends on 11)

A motor vehicle having a sensor device according to claim 11.