US4576416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-circuit pressure medium brake system
Assignee: Robert Bosch GmbH
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Filing: 1984-12-03
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Granted: 1986-03-18
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Expires: 2004-12-03
Abstract
Abstract A multi-circuit pressure medium brake system in which a pressure control valve is used which can be triggered in a multi-circuit manner. One of the controls is effected electrically and generally advances ahead of a pressure-medium control, so that when the system is functioning properly, the pressure-medium control remains without effect. Various modifications for the pressure control valve have been set forth and a plurality of combinations of switching members for meeting various pressure regulating conditions have been set forth. The multi-circuit pressure medium brake system is preferably applicable to motor vehicles.
Inventors
- 👤 Egbert Muller
- 👤 Werner Stumpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:13
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/66; B60T13/68; B60T13/683; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/361
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
227 words
A brake system comprising a fluid pressure source from a fluid pressure line, at least one brake cylinder connected to said fluid pressure line which is initiated in accordance with a brake pedal position, at least one fluid pressure control valve in said fluid pressure line in said brake system which controls fluid under pressure from said fluid pressure source to said at least one brake cylinder, a relay control valve in said at least one fluid pressure control valve that controls fluid flow from said fluid pressure source to said at least one brake cylinder, first and second pressure control lines in said at least one fluid pressure control valve that applies fluid under pressure which operates said relay control valve, said at least one fluid pressure control valve including electromagnetic switching valves therein connected to and controlled by a first of two simultaneously operated brake control circuits which controls fluid under pressure from said first fluid pressure control line to said relay control valve for controlling flow of fluid under pressure through said at least one pressure control valve to said at least one pressure brake cylinder for operation thereof, and said second fluid pressure control line is connected to a second of said two simultaneously operated brake control circuits for operation of said relay control valve in the event said electromagnetic switching valves malfunction.
Claim 2
Dependent Claim
227 words
A brake system comprising a fluid pressure source from a fluid pressure line, at least one brake cylinder connected to said fluid pressure line which is initiated in accordance with a brake pedal position, at least one fluid pressure control valve in said fluid pressure line in said brake system which controls fluid under pressure from said fluid pressure source to said at least one brake cylinder, a relay control valve in said at least one fluid pressure control valve that controls fluid flow from said fluid pressure source to said at least one brake cylinder, first and second pressure control lines in said at least one fluid pressure control valve that applies fluid under pressure which operates said relay control valve, said at least one fluid pressure control valve including electromagnetic switching valves therein connected to and controlled by a first of two simultaneously operated brake control circuits which controls fluid under pressure from said first fluid pressure control line to said relay control valve for controlling flow of fluid under pressure through said at least one pressure control valve to said at least one pressure brake cylinder for operation thereof, and said second fluid pressure control line is connected to a second of said two simultaneously operated brake control circuits for operation of said relay control valve in the event said electromagnetic switching valves malfunction.
Claim 3
Dependent Claim
43 words
A brake system as defined by claim 1, characterized in that said at least one fluid pressure control valve is a relay valve including a switching chamber which is supplied with fluid pressure by one of said at least two brake control circuits.
Claim 4
Dependent Claim
42 words
A brake system as defined by claim 2, comprising at least two electromagnetic valves as switching members in an electrically controlled fluid pressure line which are inserted into a pressure circuit between a source of fluid pressure medium and said switching chamber.
Claim 5
Dependent Claim
70 words
A brake system as defined by claim 3, in which said electromagnetic valves open and close pressure openings in said at least one fluid pressure control valve for monitoring an inflow of fluid under pressure from said source of pressure medium to said switching chamber as well as monitoring an outflow of fluid from said switching chamber and are capable of maintaining a fluid under pressure in said switching chamber.
Claim 6
Dependent Claim
24 words
A multi-circuit pressure medium brake system as set forth in claim 4 in which said switching chamber is supplied only with one control pressure.
Claim 7
Dependent Claim
24 words
A multi-circuit pressure medium brake system as set forth in claim 3 in which said switching chamber is supplied only with one control pressure.
Claim 8
Dependent Claim
33 words
A multi-circuit pressure medium brake system as set forth in claim 2 which includes an OR element which is integrated with the pressure control valve for dual-circuit triggering of said pressure control valve.
Claim 9
Dependent Claim
29 words
A multi-circuit pressure medium brake system as defined by claim 7, in which one electromagnetic valve is located preceding said OR element in a direction toward the switching chamber.
Claim 10
Dependent Claim
30 words
A multi-circuit pressure medium brake system as defined by claim 7, in which an electromagnetic valve is located subsequent to said OR element in a direction toward said switching chamber.
Claim 11
Dependent Claim
44 words
A multi-circuit pressure medium brake system as defined by claim 7, in which one electromagnetic valve comprises a combination of a 3/2-way pilot valve and a pressure-actuated main valve and is inserted downstream said relay valve into a conduit connection with a brake cylinder.
Claim 12
Dependent Claim
31 words
A multi-circuit pressure medium brake system as defined by claim 7, in which said OR element is embodied by the insertion of a 3/2-way magnetic valve into a control circuit connection.
Claim 13
Dependent Claim
32 words
A multi-circuit pressure medium brake system as defined by claim 7, in which said OR element is embodied by the insertion of a 3/2-way magnetic valve into a pressure medium control line.
Claim 14
Dependent Claim
27 words
A multi-circuit pressure medium brake system as defined by claim 2, in which a relay piston of said relay valve is combined with an additional drag piston.
Claim 15
Dependent Claim
26 words
A multi-circuit pressure medium brake system as defined by claim 13, in which said drag piston includes two seals between which there is an outside-air connection.
Claim 16
Dependent Claim
43 words
A multi-circuit pressure medium brake system as defined by claim 13, in which a chamber is situated between said relay piston and said drag piston and is selectively connectable via a 3/2-way magnetic valve to either a control circuit or an outside-air connection.
Claim 17
Dependent Claim
24 words
A multi-circuit pressure medium brake system as set forth in claim 2 in which said switching chamber is supplied only with one control pressure.
Claim 18
Dependent Claim
24 words
A multi-circuit pressure medium brake system as defined by claim 1, which includes an additional pressure-dependent quantity regulating valve in said pressure control valve.
Claim 19
Dependent Claim
23 words
A multi-circuit pressure medium brake system as defined by claim 17, which includes an additional pressure-dependent blocking valve in said pressure control valve.
Claim 20
Dependent Claim
23 words
A multi-circuit pressure medium brake system as defined by claim 18, in which said blocking valve is pre-controllable by a 3/2-way magnetic valve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |