# US 8,770,351 B2 · Disc brake device for rail vehicles

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- Number: US 8,770,351 B2
- Document ID: US8770351B2
- Status: Granted
- Kind: B2
- Application number: 13/505,000
- Filed: 2010-10-27
- Published: 2012-08-23
- Granted: 2014-07-08
- Earliest claimed: 2009-10-30
- Assignees: Siemens Aktiengesellschaft
- Applicants: Gerhard Engels
- Inventors: Gerhard Engels
- Web page: https://patentgrep.com/patent/US8770351B2

## CPC

- B60T 17/228: {for railway vehicles}
- B61H 5/00: Applications or arrangements of brakes with substantially radial braking surfaces pressed together in axial direction, e.g. disc brakes
- F16D 55/2245: {in which the common actuating member acts on two levers carrying the braking members, e.g. tong-type brakes (similar brakes for rail vehicles B61H5/00)}
- F16D 66/00: Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D 2066/005: {Force, torque, stress or strain}
- 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
- B61H: BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES (arrangements in rail vehicles for adjusting wheel-braking force to meet varying vehicular or permanent-way conditions B60T8/00; transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive, brake systems incorporating such transmitting means, e.g. air-pressure brake systems, B60T13/00; construction, arrangement or operation of valves incorporated in power brake systems B60T15/00; component parts, details or accessories of brake systems B60T17/00)
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A disk brake device for rail vehicles includes a brake disk for attachment to a chassis and a brake assembly for providing a braking force. The brake assembly has a brake cylinder and a brake caliper that carries a brake pad for cooperating with the brake disk. A sensor is provided on a force transmission path from the brake cylinder to the brake pad. The sensor is configured and arranged to detect a force transfer to the brake disk.

## Claims

### Claim 1

A disc brake device for a rail vehicle, the device comprising:
a brake disc for attachment to a chassis of the rail vehicle;
a brake arrangement for providing a braking force, said brake arrangement including a brake cylinder and a brake caliper carrying a brake lining disposed to cooperate with said brake disc;
a sensor configured to detect a force transmission to said brake disc and disposed on a force transmission path from said brake cylinder to said brake lining;
said brake lining being attached via a joint to said brake caliper and said sensor being arranged in an area of said joint, said joint being a combination of a pin and a bush and said sensor being integrated in said bush.

### Claim 2 (depends on 1)

The disc brake device according to claim 1, wherein said sensor is a piezoelement.

### Claim 3 (depends on 1)

The disc brake device according to claim 1, wherein said sensor is configured to output an electrical signal, the electrical signal indicating when a predefined minimum force transmission between said brake lining and said brake disc has been reached.

### Claim 4 (depends on 1)

The disc brake device according to claim 1, wherein said brake lining is held by a brake lining holder and each said brake line holder is provided with an inductive proximity switch for detecting an approach of said brake lining holder to said brake disc.

### Claim 5 (depends on 4)

The disc brake device according to claim 4, wherein said proximity switch is integrated in an edge area of said brake lining holder.

### Claim 6 (depends on 4)

The disc brake device according to claim 4, wherein said proximity switch is configured for signaling a brake lining loss and/or when a wear limit for the brake lining is reached.