Brake System, Especially for Utility Vehicles

• US 20070273201A1
• Filed: 09/21/2004
• Published: 11/29/2007
• Est. Priority Date: 10/29/2003
• Status: Abandoned Application

• Current Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Original Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Inventors: Unser, Karl-Heinz, Scherrer, Joachim
• Application Number:
  US10/577,509
• Publication Number:
  US 20070273201A1
• Time in Patent Office: Days
• US Class Current: 303/113.100
• CPC Class Codes: B60T 8/303 using pneumatic valves
• CPC Class Codes: B60T 8/343 Systems characterised by their lay-out B60T8/349 takes precedence
• CPC Class Codes: B60T 8/361 wherein the pilot valve is mounted in a circuit controlling an auxiliary fluid system

Abstract

A brake system, in particular for utility vehicles is provided. A compressed-air-operated brake system (10) which is used, in particular, in utility vehicles, has a multi-circuit brake system having a front-axle brake circuit (20) and a rear-axle brake circuit (13). Here, a load emptying valve (12) is provided in the front-axle brake circuit (20) in order to influence the braking force which is adapted to the loading of the vehicle. The braking force or the brake pressure in the rear-axle brake circuit (13) is predefined by means of an automatically load-dependent braking force regulating process as a function of the load acting on the rear axle. The load emptying valve (12) is actuated by a fluidic connection (16) from the rear-axle brake circuit. A check valve (17) is provided for shutting off the fluidic connection (16) between the load emptying valve (12) and the rear-axle brake circuit (13) when a brake slip regulating process is carried out at the rear axle.

Claims

1-6. -6. (canceled)

7. A brake system comprising:

a front-axle brake circuit having a load emptying valve and front axle brake cylinder, the load emptying valve influencing a brake pressure at the front axle brake cylinders; and

a rear-axle brake circuit having an automatic load-dependent brake pressure regulator and rear axle brake cylinders, a brake pressure at the rear axle brake cylinders being influenced as a function of a load acting on a rear axle;

a fluid connection, the load emptying valve having a control inlet connected to the rear-axle brake circuit via the fluid connection;

a check valve provided in the fluid connection between the load emptying valve and the rear-axle brake circuit; and

a controller, the check valve being switched to a shutoff position when a brake slip regulating process is carried out at the rear axle by the controller so that the fluid connection from the load emptying valve in a direction of the rear axle brake cylinders is shut off;

the check valve including an integrated nonreturn valve, the nonreturn valve, in the shutoff position of the check valve, being connected to the fluid connection and preventing a drop in pressure at the control inlet of the load emptying valve, and permitting a rise in pressure at the control inlet of the load emptying valve.

8. The brake system as recited in claim 7 wherein in order to adapt the pressure at the control inlet of the load emptying valve to a current brake pressure at the rear axle brake cylinders, the check valve can be switched in a defined fashion from the shutoff position into a nonblocking position of rest.

9. The brake system as recited in claim 7 further comprising another valve, the check valve being integrated into the other valve.

10. The brake system as recited in claim 9 wherein the other valve is a service-brake valve or a relay valve supplying the rear axle with supply pressure of the brake system.

11. The brake system as recited in claim 7 wherein the automatic load-dependent brake pressure regulator carries out the brake slip regulating process carried out at the rear axle.

12. The brake system as recited in claim 7 wherein the brake system is a utility vehicle brake system.