Machine element and arrangement for measuring a force or a moment as well as a method for producing the machine element

Patent metadata

Field	Value
Publication number	US-9587996-B2
Application number	US-201514804600-A
Country	US
Kind code	B2
Filing date	Jul 21, 2015
Priority date	Jul 22, 2014
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A machine element designed for transferring a force and/or a torque and also for measuring the force or the torque to be transferred, as well as to an arrangement for measuring a force and/or a torque having such a machine element. A method for producing the machine element is also provided. The machine element according to the invention has a primary sensor for measuring the force to be transferred or the torque to be transferred and this sensor has a permanent magnetization. A measurable magnetic field occurring outside of the machine element is caused by the permanent magnetization and also by the force and/or by the torque. The permanent magnetization extends along a closed magnetization path. The permanent magnetization is formed in a surface layer of the machine element that has a greater magnetic permeability than at least the sections of the machine element located under the surface layer.

First claim

The invention claimed is:

1. A machine element for transferring at least one of a force or a torque, the machine element comprising a primary sensor for measuring the force to be transferred or the torque to be transferred, said sensor having a permanent magnetization; wherein a measurable magnetic field occurring outside of the machine element is caused by the permanent magnetization and also by the at least one of the force or the torque; the permanent magnetization extends along a closed magnetization path; and the permanent magnetization is formed in a surface layer of the machine element that has a greater magnetic permeability than at least some sections of the machine element located under the surface layer.

2. The machine element according to claim 1 , wherein the magnetization path extends with a center point angle of at least 360° over an extent of the machine element, and the magnetization path completes itself around an axis of the machine element.

3. The machine element according to claim 1 , wherein the magnetization path extends with a center point angle of less than 360° over an extent of the machine element.

4. The machine element according to claim 1 , wherein the magnetization path is formed by a closed curve that is projected onto the surface layer.

5. The machine element according to claim 4 , wherein the closed curve does not enclose an axis of the machine element.

6. The machine element according to claim 1 , wherein a magnetic insulation layer constructed in the machine element is arranged under the surface layer.

7. An arrangement with a machine element according to claim 1 , further comprising at least one secondary sensor that is formed by a magnetic field sensor and is designed for measuring at least one component of a magnetic field caused by the permanent magnetization and also by the at least one of the force or the torque.

8. A method for producing a machine element according to claim 1 , comprising:
preparing a machine element base body; and
forming a surface layer on the machine element base body, which has a permanent magnetization, the surface layer has a greater magnetic permeability than at least the sections of the machine element located under the surface layer, and wherein the permanent magnetization extends along a closed magnetization path.

9. The method according to claim 8 , wherein the surface layer is formed such that the surface layer is deposited chemically, mechanically, thermally, or thermomechanically onto the section of the machine element located underneath.

10. The method according to claim 8 , wherein a magnetic insulation layer is also formed under the surface layer.

11. The method according to claim 10 , further comprising forming the surface layer with the permanent magnetization by diffusion into the machine element base body or into the magnetic insulation layer.

12. The method according to claim 8 , further comprising forming the surface layer with the permanent magnetization by diffusion into the machine element base body.

Assignees

• Schaeffler Technologies Ag

Inventors

• Matysik Jan

Classifications

• B05D7/54

  No clear coat specified · CPC title

• B05D7/14

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title

• G01L3/102 Primary

  involving magnetostrictive means (magnetostrictive sensors H10N35/101) · CPC title

• G01L5/0061

  Force sensors associated with industrial machines or actuators (for the specific machine or actuator involved see relevant class, e.g. F01, F04, F16, B66, E21) · CPC title

• G01L1/125

  by using magnetostrictive means (magnetostrictive sensors H10N35/101) · CPC title