# US 7,610,998 B2 · Disc brake

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- Number: US 7,610,998 B2
- Document ID: US7610998B2
- Status: Granted
- Kind: B2
- Application number: 11/409,038
- Filed: 2006-04-24
- Published: 2007-01-04
- Granted: 2009-11-03
- Earliest claimed: 2003-10-23
- Assignees: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH
- Inventors: Johann Baumgartner; Guenther Gschossmann
- Web page: https://patentgrep.com/patent/US7610998B2

## CPC

- G01P 1/026: {for speed measuring devices, e.g. pulse generator}
- B60T 8/329: {Systems characterised by their speed sensor arrangements}
- G01D 5/145: {influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06)}
- G01P 3/488: delivered by variable reluctance detectors
- F16D 2065/386: {driven electrically}
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A disc brake, especially for utility vehicles, which includes a caliper enclosing a brake disc, a pneumatically or electromotively operated tensioning device for tensioning the brake, which is located in the caliper, a magnet wheel rotating with the brake disc, and a stationary sensor for detecting the angle of rotation and the speed of the magnet wheel. The sensor is mounted at a distance from the magnet wheel and at least one line is connected to transmit pulses between the sensor and the magnet wheel. As a result, the sensor can be mounted on the housing protected from the action of heat and other environmental influences and so as to be easily accessible.

## Claims

### Claim 1

A disc brake for use with a brake disc, comprising:
a brake caliper which, in use, straddles the brake disc;
a pneumatically or electromotively actuable brake application device, arranged in the brake caliper for applying the brake;
a magnet wheel, which in use rotates with the brake disc;
a positionally fixed sensor for measuring a rotational angle and a rotational speed of the magnet wheel
at least one line, separate from the sensor, operatively arranged in the caliper to transmit magnetic pulses;
wherein the sensor is arranged on a side of the caliper, which side faces away from the brake disc in use, at one end of the line, and is spaced apart from the magnet wheel, which magnet wheel is arranged at an opposite end of the line; and
wherein the sensor is a separate component from the one line and is exchangeable without changing the one line.

### Claim 2 (depends on 1)

The disc brake as claimed in claim 1, wherein the line for transmitting pulses comprises a soft iron rod.

### Claim 3 (depends on 1)

The disc brake as claimed in claim 1, further comprising a separating wall arranged between the line and the magnet wheel.

### Claim 4 (depends on 2)

The disc brake as claimed in claim 2, further comprising a separating wall arranged between the line and the magnet wheel.

### Claim 5 (depends on 3)

The disc brake as claimed in claim 3, wherein the separating wall is formed by a non-magnetic metal separating plate.

### Claim 6 (depends on 1)

The disc brake as claimed in claim 1, wherein the sensor is mounted on a printed circuit board, which is accessible by removing a cover.

### Claim 7 (depends on 2)

The disc brake as claimed in claim 2, wherein the sensor is mounted on a printed circuit board, which is accessible by removing a cover.

### Claim 8 (depends on 3)

The disc brake as claimed in claim 3, wherein the sensor is mounted on a printed circuit board, which is accessible by removing a cover.

### Claim 9 (depends on 1)

The disc brake as claimed in claim 1, wherein the sensor comprises a permanent magnet.

### Claim 10 (depends on 2)

The disc brake as claimed in claim 2, wherein the sensor comprises a permanent magnet.

### Claim 11 (depends on 1)

The disc brake as claimed in claim 1, wherein the sensor is an active sensor, two lines being operatively arranged in the caliper for transmitting pulses to the active sensor.

### Claim 12 (depends on 1)

The disc brake as claimed in claim 1, further comprising an electronic circuit for open-loop and closed-loop control of wear adjustment due to brake lining wear.

### Claim 13 (depends on 6)

The disc brake as claimed in claim 6, further comprising an electronic circuit for open-loop and closed-loop control of wear adjustment due to brake lining wear.