Control valve having a device for generating defined braking and release times

Patent metadata

Field	Value
Publication number	US-9296378-B2
Application number	US-201313932418-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Jul 6, 2012
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A control valve for an indirectly acting compressed-air brake of a rail vehicle includes a pneumatic relay valve for controlling a brake cylinder pressure via a pilot-control circuit for generating a temporally defined pilot-control pressure for the proportional activation of the relay valve, wherein, connected upstream of the pilot-control circuit, there is provided a device for generating the braking and release times of the compressed-air brake, wherein the device for generating uniform braking and release times of the compressed-air brake has mechanisms for realizing a volume flow with constant pressure change for the compressed-air supply and the deaeration of the pilot-control circuit.

First claim

The invention claimed is:

1. A control valve for an indirectly acting compressed-air brake of a rail vehicle, the control valve comprising:
a pneumatic relay valve controlling a brake cylinder pressure via a pilot-control circuit that generates a temporally defined pilot-control pressure for the proportional activation of the relay valve,
wherein, connected upstream of the pilot-control circuit, there is provided a device for generating uniform braking and release times of the compressed-air brake, and
wherein the device for generating uniform braking and release times of the compressed-air brake includes variable flow throttles for realizing a volume flow with constant pressure change for a compressed-air supply and de-aeration of the pilot-control circuit, and
further comprising a pneumatic comparison diaphragm for the variable throttling of the compressed-air supply and de-aeration of the pilot-control circuit, the pneumatic comparison diaphragm being acted on, on one side, by the pilot-control pressure and, on the other side, by a comparison pressure of a defined volume.

2. A control valve for an indirectly acting compressed-air brake of a rail vehicle, the control valve comprising:
a pneumatic relay valve controlling a brake cylinder pressure via a pilot-control circuit that generates a temporally defined pilot-control pressure for the proportional activation of the relay valve,
wherein, connected upstream of the pilot-control circuit, there is provided a device for generating uniform braking and release times of the compressed-air brake,
wherein the device for generating uniform braking and release times of the compressed-air brake includes mechanisms for realizing a volume flow with constant pressure change for a compressed-air supply and de-aeration of the pilot-control circuit, and
wherein the mechanisms realizing a volume flow with constant pressure change in the pilot-control circuit comprise a variable throttle, controlled by the pilot-control pressure, of the compressed-air supply and de-aeration of the pilot-control circuit.

3. The control valve of claim 2 , further comprising a pneumatic comparison diaphragm for the variable throttling of the compressed-air supply and de-aeration of the pilot-control circuit is provided, the pneumatic comparison diaphragm being acted on, on one side, by the pilot-control pressure and, on the other side, by a comparison pressure of a defined volume.

4. The control valve of claim 3 , further comprising a comparison pressure vessel that provides the comparison pressure for the pneumatic comparison diaphragm, which comparison pressure vessel is charged and evacuated via an aeration nozzle and a de-aeration nozzle by corresponding valve parts.

5. The control valve of claim 3 , wherein the pneumatic comparison diaphragm actuates a variable flow throttle for aeration and a variable flow throttle for de-aeration of the pilot-control pressure circuit.

6. The control valve of claim 4 , wherein the provision of the comparison pressure and the variable flow throttle for aeration and the variable flow throttle for de-aeration of the pilot-control circuit are realized with a common 2×4/3 directional valve.

7. The control valve of claim 6 , wherein, in a pressure-balanced state of the comparison diaphragm, the two flow throttles for the pilot-control pressure are open, whereas the two corresponding valve parts for aeration and de-aeration of the comparison pressure vessel are closed.

8. The control valve of claim 3 , further comprising at least one restoring spring which acts on the comparison diaphragm is configured such that, when a pilot-control pressure regulated by an inlet valve of the pilot-control circuit is reached, an asymptotic pressure alignment is avoided.

9. The control valve of claim 8 , wherein the inlet valve for the regulation of the pilot-control pressure is in the form of a 3/3 directional valve.

10. A compressed-air brake of a rail vehicle, comprising at least one control valve for an indirectly acting compressed-air brake of a rail vehicle, the control valve comprising:
a pneumatic relay valve controlling a brake cylinder pressure via a pilot-control circuit that generates a temporally defined pilot-control pressure for the proportional activation of the relay valve,
wherein, connected upstream of the pilot-control circuit, there is provided a device for generating uniform braking and release times of the compressed-air brake,
wherein the device for generating uniform braking and release times of the compressed-air brake includes mechanisms for realizing a volume flow with constant pressure change for a compressed-air supply and de-aeration of the pilot-control circuit, and
wherein the mechanisms realizing a volume flow with constant pressure change in the pilot-control circuit comprise a variable throttle, controlled by the pilot-control pressure, of the compressed-air supply and de-aeration of the pilot-control circuit.

Assignees

• Knorr Bremse Systeme Für Schienenfahrzeuge Gmbh
• Knorr Bremse Systeme

Inventors

• Krauth Christian

Classifications

• B60T15/184

  Railway control or brake valves · CPC title

• B60T15/00 Primary

  Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00 (valve structures responsive to a speed condition B60T8/34; valves in general F16K) · CPC title

• Y10T137/7762

  Fluid pressure type · CPC title

• B60T13/266 Primary

  Systems with both direct and indirect application, e.g. in railway vehicles · CPC title