US 5,100,208 AGranted

Pressure control valve for compressed-air-actuated vehicle brake system

AssigneeRobert Bosch GmbH

InventorErnst Angermair

Life of this patent

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Abstract

A pressure control valve having a pressure fluid inlet chamber connected to a pressure fluid source via a brake valve. A pressure fluid outlet chamber of the pressure control valve communicates with a brake cylinder. The pressure fluid inlet chamber and the pressure fluid outlet chamber can be connected to a control chamber via an inlet valve. The pressure fluid outlet chamber can be connected to the atmosphere via a controllable outlet valve. From the pressure fluid outlet chamber, a first connecting conduit leads to the control chamber of the inlet valve. The first connecting conduit can be monitored by a control valve embodied as a 2/2-way valve. A second connecting conduit, which is always open, is also provided between the control chamber of the inlet valve and the pressure fluid inlet chamber. This conduit exerts a delaying action upon pressure fluid flowing at high speed through it. The pressure control valve is usable in compressed-air-actuated vehicle brake systems, in particular those having an anti-skid system.

Claims6

Dependent claims

A pressure control valve (10) for compressed-air-actuated vehicle brake systems comprising:

a pressure fluid inlet chamber (30), which communicates with a pressure fluid source via a pressure fluid inlet (40),
a pressure fluid outlet chamber (35) which communicates with a brake cylinder (47) via a pressure fluid outlet (45),
an inlet valve (12), via which the pressure fluid inlet chamber (30) can be connected to the pressure fluid outlet chamber (35),
an outlet valve (17), via which the pressure fluid outlet chamber (35) can be connected to an atmospheric surrounding,
an actuating first diaphragm (21), which is intended for actuation of the inlet valve (12) which can be urged in a closing direction of the inlet valve (12) by a pressure in a control chamber (31),
a first connecting conduit (82, 83, 84) through which a fluid flows in both directions, said first connecting conduit is monitorable by a first control valve (58) between the control chamber (31) of the inlet valve (12) and the pressure fluid outlet chamber (35),
a second connecting conduit (92) between the control chamber (31) of the inlet valve (12) and the pressure fluid inlet chamber (30),
and a second diaphragm (25) intended for actuation of the outlet valve (17) which is capable of being urged in the closing direction of the outlet valve (17) by a pressure in a control chamber (36), which chamber can be connected selectively with the atmospheric surrounding as well as with the pressure fluid inlet chamber (30) via a second control valve (59),
said first control valve (58) is a 2/2-way valve;
and
said second connecting conduit (92), which exerts a delaying action upon pressure fluid flowing at high speed, is always open.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/631,003Filed 19 Dec 1990
Priority: DE 394256322 Dec 1989
Granted: 31 Mar 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B60T 8/5087
Having means for controlling the rate at which pressure is reapplied to or released from the brake: pressure release using restrictions
B60T 8/36
Having a fluid pressure regulator responsive to a speed condition: including a pilot valve responding to an electromagnetic force
B60T 8/3605
Including a pilot valve responding to an electromagnetic force: wherein the pilot valve is mounted in a circuit controlling the working fluid system
B60T 8/5006
Having means for controlling the rate at which pressure is reapplied to or released from the brake: pressure reapplication by pulsing of valves