METHOD FOR PRODUCING A MAGNET UNIT FOR A SENSOR DEVICE FOR DETECTING A MEASURED VALUE CHARACTERISTIC OF A ROTATIONAL STATE OF A STEERING SHAFT OF A MOTOR VEHICLE, MAGNET UNIT, SENSOR DEVICE, AND MOTOR VEHICLE

• US 20160223361A1
• Filed: 08/11/2014
• Published: 08/04/2016
• Est. Priority Date: 09/18/2013
• Status: Active Grant

• Current Assignee: Valeo Schalter und Sensoren GmbH (Valeo SE)
• Original Assignee: Valeo Schalter und Sensoren GmbH (Valeo SE)
• Inventors: Rachui, Dirk, Thom, Jens, Froehlich, Ekkehart
• Granted Patent: US 10,444,039 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01D 11/245 Housings for sensors
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06
• CPC Class Codes: G01D 5/24442 by mounting means
• CPC Class Codes: G01L 3/104 involving permanent magnets
• CPC Class Codes: G01L 5/221 to steering wheels, e.g. for power assisted steering
• CPC Class Codes: G01P 3/487 delivered by rotating magnets

Abstract

The invention relates to a method for producing a magnet unit (1) for a sensor device for detecting a measurement variable which is characteristic of a state of rotation of a steering shaft of a motor vehicle, by providing a ring-shaped magnet element (3) composed of a plastics-bonded magnet material, by providing a carrier sleeve (2) for the connection of the magnet unit (1) to a shaft part of the steering shaft, and by connecting the magnet element (3) to the carrier sleeve (2), in particular axially adjacent to one another by way of respective axial face sides (5, 7), wherein a plastics element (8) is provided on the carrier sleeve (2), and the connecting comprises the plastics element (8) and the magnet element (3) being cohesively connected to one another.

Claims

1. A method for producing a magnet unit for a sensor device for detecting a measurement variable which is characteristic of a state of rotation of a steering shaft of a motor vehicle, by:

providing a ring-shaped magnet element composed of a plastics-bonded magnet material;

providing a carrier sleeve for the connection of the magnet unit to a shaft part of the steering shaft; and

connecting the magnet element to the carrier sleeve,

wherein a plastics element is provided on the carrier sleeve, and connecting the magnet element comprises cohesively connecting the plastics element and the plastics-bonded magnet material of the magnet element to one another.

2. The method according to claim 1, wherein the magnet element and the carrier sleeve are connected and axially adjacent to one another, by way of respective axial face sides wherein the plastics element and the axial face side of the magnet element are cohesively connected to one another.

3. The method according to claim 1, wherein the cohesive connection is performed by laser welding and/or ultrasound welding.

4. The method according to claim 1, wherein an axial stud by way of which the cohesive connection is performed is formed on an axial face side of the plastics element and/or on an axial face side of the magnet element.

5. The method according to claim 1, wherein the plastics element is composed of a transparent plastics material.

6. The method according to claim 1, wherein a plastics material of the plastics element is injection-moulded onto an axial face side of the carrier sleeve.

7. The method according to claim 1, wherein the plastics element is connected in positively locking fashion to the carrier sleeve.

8. The method according to claim 1, wherein, during the connection of the plastics element to the carrier sleeve, positive locking with rotationally conjoining action is produced between the plastics element and the carrier sleeve.

9. The method according to claim 8, wherein the positive locking with rotationally conjoining action is produced by way of openings in the carrier sleeve, into which openings the plastics element extends.

10. The method according to claim 8, wherein the positive locking with rotationally conjoining action is produced by way of an undulating and/or toothed outer edge of the carrier sleeve.

11. A magnet unit for a sensor device for detecting a measurement variable which is characteristic of a state of rotation of a steering shaft of a motor vehicle, comprising:

a ring-shaped magnet element composed of a plastics-bonded magnet material; and

a carrier sleeve which is connected to the magnet element and by way of which the magnet element is connected to a shaft part of the steering shaft,

wherein a plastics element is arranged on the carrier sleeve, which is cohesively connected to the plastics-bonded magnet material of the magnet element.

12. A sensor device for detecting a measurement variable which is characteristic of a state of rotation of a steering shaft of a motor vehicle, comprising a magnet unit according to claim 11.

13. A motor vehicle having a sensor device according to claim 12.