# US 8,770,354 B2 · Pneumatic brake cylinder

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- Number: US 8,770,354 B2
- Document ID: US8770354B2
- Status: Granted
- Kind: B2
- Application number: 13/124,152
- Filed: 2009-10-07
- Published: 2011-08-18
- Granted: 2014-07-08
- Earliest claimed: 2008-10-15
- Assignees: Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH
- Applicants: Marc-Gregory Elstorpff; Christian Ebner; Michael Mathieu; Erich Fuderer
- Inventors: Marc-Gregory Elstorpff; Christian Ebner; Michael Mathieu; Erich Fuderer
- Web page: https://patentgrep.com/patent/US8770354B2

## CPC

- B60T 17/081: {Single service brake actuators}
- B61H 15/0028: {with screw-thread and nut}
- F16D 65/28: arranged apart from the brake
- F16D 65/56: with screw-thread and nut
- F16D 2121/02: Fluid pressure
- 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

The invention relates to a pneumatic brake cylinder including a housing, a piston that can be moved in the housing and is used to transfer the pneumatic pressure to a brake, and a device for automatic adjustment in the event of wear of the brake linings, the device including a spindle, an adjusting nut, and a piston tube that can be engaged with the adjusting nut. According to the invention, a torque applied to the piston tube by the adjusting nut is introduced by the piston tube directly into elements connected to the housing in a fixed manner.

## Claims

### Claim 1

A pneumatic brake cylinder comprising:
a housing;
a piston which can be moved in the housing to transmit pneumatic pressure to a brake; and
a device for automatic adjustment for wear of brake linings, the device including a spindle, an adjusting nut and a piston tube which can be brought into engagement with the adjusting nut,
wherein a torque applied by the adjusting nut to the piston tube is introduced by the piston tube directly into elements which are connected fixedly to the housing,
wherein the elements connected fixedly to the housing are configured as sliding blocks which slide in slots of the piston tube,
wherein orientation of the housing and the device for automatic adjustment are configured such that the device for automatic adjustment is mounted to the housing prior to insertion of the elements fixedly connected to the housing into the brake cylinder housing, and
wherein a control sleeve is arranged in the piston tube, the control sleeve being a composite part with a sliding sleeve made from plastic and an injection molded coupling ring made from metal, and wherein, at a free end, the injection molded coupling ring has an oblique internal toothing system which is configured to engage an external toothing system of the adjusting nut.

### Claim 2 (depends on 1)

The pneumatic brake cylinder of claim 1, wherein the piston is positioned loosely inside the brake cylinder and has no fixed connection to the piston tube.

### Claim 3 (depends on 2)

The pneumatic brake cylinder of claim 2, wherein the piston is produced as a deep drawn part made from steel.

### Claim 4 (depends on 3)

The pneumatic brake cylinder of claim 3, wherein a sealing ring is vulcanized onto the edge of the piston.

### Claim 5 (depends on 1)

The pneumatic brake cylinder of claim 1, wherein the external toothing system is disposed on one end side of the adjusting nut.

### Claim 6 (depends on 5)

The pneumatic brake cylinder of claim 5, wherein the piston tube is brought into engagement via a piston tube toothing system with the external toothing system of the adjusting nut.

### Claim 7 (depends on 1)

The pneumatic brake cylinder of claim 1, wherein the sliding blocks engage with a free end into sliding channels of the control sleeve.

### Claim 8 (depends on 7)

The pneumatic brake cylinder of claim 7, wherein the sliding channels are dimensioned in such a way that they act as a stop for the sliding blocks and restrict an axial movement of the control sleeve.