# US 8,782,877 B2 · Method for producing clutch and brake disks for electromagnetic clutches or electromagnetic brakes having at least one friction surface element

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- Number: US 8,782,877 B2
- Document ID: US8782877B2
- Status: Granted
- Kind: B2
- Application number: 13/265,952
- Filed: 2010-01-15
- Published: 2012-04-26
- Granted: 2014-07-22
- Earliest claimed: 2009-04-24
- Assignees: Kendrion Linnig GmbH
- Applicants: Manfred Gebhart
- Inventors: Manfred Gebhart
- Web page: https://patentgrep.com/patent/US8782877B2

## CPC

- F16D 27/112: with flat friction surfaces, e.g. discs
- F16D 65/12: Discs; Drums for disc brakes
- F16D 2027/008: {Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path}
- F16D 2069/004: {Profiled friction surfaces, e.g. grooves, dimples}
- F16D 2121/20: using electromagnets
- F16D 2250/00: Manufacturing; Assembly
- Y10T 29/49002: Electrical device making
- Y10T 29/49012: Rotor
- Y10T 29/4902: Electromagnet, transformer or inductor
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for producing clutch and/or brake friction disks for electromagnetic clutches and/or electromagnetic brakes having at least one friction surface element through which the magnetic field flows, wherein at least one circular slot is cut by lathe machining in the friction surface element from a friction contact surface, and wherein at least two webs which connect a pole surface ring to the remaining/other friction surface element are made in the friction surface element from that side which is opposite the friction contact surface such that the slots which are cut from the friction contact surface are interrupted remote from the webs to form continuous air gaps.

## Claims

### Claim 1

A method for producing clutch and/or brake friction disks for electromagnetic clutches and/or electromagnetic brakes having at least one friction surface element through which a magnetic field flows, comprising the steps of: cutting at least one circular slot by lathe machining the at least one friction surface element from a friction contact surface toward a surface opposite to the friction contact surface to define at least a first and a second pole surface ring, one on each side of the at least one circular slot;
and forming at least two webs which connect on the surface opposite to the friction contact surface, wherein the at least two webs connect the first pole surface ring to the second pole surface ring such that the at least one circular slot cut from the friction contact surface is interrupted by the at least two webs to form continuous air gaps between the at least two webs.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein an axial thickness of magnetically isolated parts of the at least one friction surface element is determined at least predominantly by the at least one circular slot.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein magnetic isolation in the radial direction of adjacent parts of the at least one friction surface element is substantially produced by a space in the at least one circular slot cut, which the space is singly contiguous in an axial direction from the friction contact surface as far as the webs.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein the at least one friction surface element is partially cut out from a rear face.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein a cutout from a rear face penetrates so far that material of the at least one friction surface element is interrupted as far as the cut slot.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein the step of cutting at least one circular slot comprises cutting two concentric slots in the at least one friction surface element in order to define a further pole surface ring in the friction contact surface between the two concentric slots.

### Claim 7 (depends on 6)

The method as claimed in claim 6, wherein the two concentric slots are produced with a uniform depth.

### Claim 8 (depends on 1)

The method as claimed in claim 1, wherein a radial sectional profile on that side which is averted from the friction contact surface is U-shaped.

### Claim 9 (depends on 1)

The method as claimed in claim 1, wherein physical geometric structures which are opposite the friction contact surface are pre-formed in a blank of the disks with a protruding volume of material by means of casting, extrusion or milling processes, and the blank is then subjected to the cutting and forming step.

### Claim 10 (depends on 1)

The method as claimed in claim 1, wherein material depth of the at least first and second pole surface rings is reduced from the friction contact surface by lathe machining in a region which is opposite the friction contact surface.

### Claim 11 (depends on 1)

The method of claim 1, wherein the forming step comprises removing material from the surface opposite to the friction contact surface to define the at least two webs.