Braking device for a braking system of a vehicle and braking system for a vehicle

Patent metadata

Field	Value
Publication number	US-9932023-B2
Application number	US-201414780750-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Mar 28, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

The present invention relates to a braking device and to a braking system, each having a master brake cylinder ( 10 ) having at least one first pressure chamber ( 12 ) that is subdivided or is able to be subdivided at least into a first partial volume ( 12 a ) and a second partial volume ( 12 b ), which are hydraulically connectable or connected to a brake fluid reservoir ( 24 ), a first brake circuit ( 28 ) being hydraulically connectable or connected to the first partial volume ( 12 a ), and having a valve device ( 38 ) that is mechanically designed in such a way that a pressure buildup up to a mechanically specified limit pressure may be brought about in the second partial volume ( 12 b ), brake fluid being transferable at least into the first brake circuit ( 28 ) via at least one subcomponent ( 38 a ) of the valve device ( 38 ), and an exceeding of the limit pressure in the second partial volume ( 12 b ) being prevented.

First claim

What is claimed is:

1. A braking device for a braking system of a vehicle, comprising:
a master brake cylinder including at least one first pressure chamber that is subdivided into a first partial volume and a second partial volume, wherein:
the first partial volume is limited by a first piston wall of at least one displaceable rod piston in such a way that a first volume of the first partial volume is variable by a shifting of the first piston wall, and
the second partial volume is limited by a second piston wall of the at least one displaceable rod piston in such a way that a second volume of the second partial volume is variable by a shifting of the second piston wall;

a brake fluid reservoir to which the first partial volume and the second partial volume are one of hydraulically connectable and hydraulically connected;
a first brake circuit one of hydraulically connectable and hydraulically connected to the first partial volume; and
a valve device including a check valve as a subcomponent via which the second partial volume is one of connectable and connected at least to the first brake circuit, the valve device being mechanically designed in such a way that in the second partial volume, a pressure is increased up to a maximum of a limit pressure that is mechanically specified at the valve device by shifting the second piston wall, wherein:
brake fluid is transferred from the second partial volume at least into the first brake circuit via at least the check valve of the valve device when the pressure in the second partial volume reaches or exceeds the limit pressure that is mechanically specified at the valve, and
despite a further shifting of the second piston wall, an exceeding of the limit pressure in the second partial volume is prevented.

2. The braking device as recited in claim 1 , further comprising:
an electrically controllable valve via which the second partial volume is one of connectable and connected to the brake fluid reservoir in such a way that, when the electrically controllable valve is in an open state, the second partial volume is pressureless despite the shifting of the second piston wall, and, when the electrically controllable valve is in a closed state, the pressure in the second partial volume is increased up to the maximum of the limit pressure mechanically specified at the valve device via the shifting of the second piston wall.

3. The braking device as recited in claim 1 , wherein:
the master brake cylinder includes a second pressure chamber and a floating piston situated displaceably between the first partial volume of the first pressure chamber and the second pressure chamber, and
a second brake circuit is one of hydraulically connectable and hydraulically connected to the second pressure chamber.

4. The braking device as recited in claim 3 , wherein the second partial volume is one of connectable and connected to the second brake circuit via at least one further check valve of the valve device in such a way that brake fluid is transferable into the second brake circuit via at least the further check valve of the valve device.

5. The braking device as recited in claim 1 , wherein:
the master brake cylinder includes a stepped bore inside which at least the first pressure chamber is situated, and
the master brake cylinder includes a stepped piston as the at least one displaceable rod piston, the stepped piston limiting the first partial volume with the first piston wall, and limiting the second partial volume with the second piston wall.

6. The braking device as recited in claim 1 , wherein:
the valve device includes an excess pressure relief valve via which the second partial volume is one of connectable and connected to the brake fluid reservoir.

7. The braking device as recited in claim 6 , wherein the valve device includes a further check valve via which the second partial volume is one of connectable and connected to the second brake circuit.

8. The braking device as recited in claim 1 , wherein:
the valve device includes a regulated check valve via which the second partial volume is one of connectable and connected to the brake fluid reservoir.

9. A braking system for a vehicle, comprising:
at least one first brake circuit;
a brake fluid reservoir; and
a master brake cylinder having at least one first pressure chamber that is subdivided at least into a first partial volume and a second partial volume, the first partial volume being limited by a first piston wall of at least one displaceable rod piston in such a way that a first volume of the first partial volume is variable by a shifting of the first piston wall, and the second partial volume being limited by a second piston wall of the at least one displaceable rod piston in such a way that a second volume of the second partial volume is variable by a shifting of the second piston wall, the first partial volume and the second partial volume being hydraulically connected to the brake fluid reservoir, and the first brake circuit being hydraulically connected to the first partial volume;
a valve device, the second partial volume being connected at least to the first brake circuit via a check valve of the valve device, the check valve being a subcomponent of the valve device, the valve device being mechanically designed in such a way that in the second partial volume, a pressure is increased up to a maximum of a limit pressure that is mechanically specified at the valve device by shifting the second piston wall, a brake fluid being transferred from the second partial volume at least into the first brake circuit via at least the check valve of the valve device when the pressure in the second partial volume reaches or exceeds the limit pressure that is mechanically specified at the valve, and, despite a further shifting of the second piston wall, an exceeding of the limit pressure in the second partial volume being prevented.

10. The braking system as recited in claim 9 , further comprising:
an electrically controllable valve via which the second partial volume is connected to the brake fluid reservoir in such a way that when the electrically controllable valve is in an open state, the second partial volume is pressureless despite the shifting of the second piston wall, and when the electrically controllable valve is in a closed state, the pressure in the second partial volume is increased up to the maximum of the limit pressure mechanically specified at the valve device, by shifting the second piston wall.

11. The braking system as recited in claim 9 , wherein the master brake cylinder has a second pressure chamber and a floating piston displaceably situated between the first partial volume of the first pressure chamber and the second pressure chamber, and a second brake circuit being hydraulically connected to the second pressure chamber.

12. The braking system as recited in claim 11 , wherein the second partial volume is connected to the second brake circuit via at least one further subcomponent of the valve device in such a way that brake fluid is transferable into the second brake circuit via at least the further subcomponent of the valve device.

13. The braking system as recited in claim 9 , wherein the master brake cylinder includes a stepped bore inside which at least the first pressure chamber is fashioned, and the master brake cylinder having a stepped piston as the at least one displaceable rod piston, which limits the first partial volume with the first piston wall, and limits the second partial volume with the second piston wall.

14. The braking system as recited in one of claim 9 , wherein:
the valve device has an excess

Assignees

• Bosch Gmbh Robert

Inventors

• Vollert Herbert
• Leibfried Oliver
• Strengert Sr Stefan
• Bauer Urs
• Schlotter Volkmar
• Kunz Michael
• Kistner Matthias
• Willmann Karl-Heinz
• Schanzenbach Matthias
• Senol Suekrue
• Masur Dagobert

Classifications

• B60T8/4081

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title

• B60T11/224 Primary

  with pressure-varying means, e.g. with two stage operation provided by use of different piston diameters including continuous variation from one diameter to another · CPC title

• B60T13/143

  Master cylinder mechanically coupled with booster · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T13/686

  in hydraulic systems or parts thereof · CPC title