US4550954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic vehicle brake system
Assignee: Robert Bosch GmbH
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Filing: 1983-08-25
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Granted: 1985-11-05
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Expires: 2003-08-25
Abstract
Abstract A hydraulic vehicle brake system is provided, which includes at least one static brake circuit and at least one anti-skid regulator, in which in the event of regulation the pressure of an external power supply is connected via a feed valve to the brake circuit and in which the discharged pressure medium is returned to the supply container. In order to prevent the pressure medium in the static circuit from being used up in the event of failure of the feed valve, the switchover of the feed valve is monitored, and the regulation of the brake pressure is either allowed to occur or is prevented in accordance with this switchover.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/18; B60T17/22; B60T8/00; B60T8/32; B60T8/88; B60T8/885; B60T8/92; B60T8/96; Y; Y10; Y10S; Y10S303/00; Y10S303/02; Y10S303/03; Y10S303/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
253 words
A hydraulic vehicle brake system including a pressure source, at least one static brake circuit having a main brake cylinder, a piston actuated by a brake pedal, at least one brake pressure anti-skid control valve between said main brake cylinder and at least one wheel brake cylinder responsive to wheel locking for initiating pressure regulation, a return-flow line into a supply container for the pressure medium discharged by said at least one brake pressure anti-skid control valve, an external energy supply system, and a valve assembly responsive to regulation of the brake pressure effecting a switchover position for connecting said external energy supply system to said at least one brake pressure anti-skid control valve, the improvement comprising a monitoring device responsive to actuation of said valve assembly for generating a signal when said valve assembly effects said switchover position, and a blocking circuit included in a triggering means for said at least one brake pressure anti-skid control valve, said blocking circuit being connected with said monitoring device, whereby upon a tendency to skidding by at least one wheel, said blocking circuit, via said triggering means directs a signal to an associated brake pressure anti-skid control valve which actuates said at least one brake pressure control valve into a brake pressure decreasing position for pressure reduction only whenever said monitoring device indicates that said valve assembly has switched over into a second switching position, via which said at least one brake pressure anti-skid control valve is supplied with pressure mediums from said pressure source.
Claim 2
Dependent Claim
253 words
A hydraulic vehicle brake system including a pressure source, at least one static brake circuit having a main brake cylinder, a piston actuated by a brake pedal, at least one brake pressure anti-skid control valve between said main brake cylinder and at least one wheel brake cylinder responsive to wheel locking for initiating pressure regulation, a return-flow line into a supply container for the pressure medium discharged by said at least one brake pressure anti-skid control valve, an external energy supply system, and a valve assembly responsive to regulation of the brake pressure effecting a switchover position for connecting said external energy supply system to said at least one brake pressure anti-skid control valve, the improvement comprising a monitoring device responsive to actuation of said valve assembly for generating a signal when said valve assembly effects said switchover position, and a blocking circuit included in a triggering means for said at least one brake pressure anti-skid control valve, said blocking circuit being connected with said monitoring device, whereby upon a tendency to skidding by at least one wheel, said blocking circuit, via said triggering means directs a signal to an associated brake pressure anti-skid control valve which actuates said at least one brake pressure control valve into a brake pressure decreasing position for pressure reduction only whenever said monitoring device indicates that said valve assembly has switched over into a second switching position, via which said at least one brake pressure anti-skid control valve is supplied with pressure mediums from said pressure source.
Claim 3
Dependent Claim
72 words
A hydraulic vehicle brake system as defined by claim 1, wherein said monitoring device comprises a pressure switch, responsive to a predetermined pressure for generating said signal, and at least one check valve for allowing the delivery of the pressure medium from said valve assembly to said at least one brake pressure control valve incorporated between a connection point of said pressure switch and said at least one brake pressure control valve.
Claim 4
Dependent Claim
18 words
A hydraulic vehicle brake system as defined by claim 1, wherein said monitoring device comprises a position switch.
Claim 5
Dependent Claim
30 words
A hydraulic vehicle brake system as defined by claim 1, wherein said valve assembly is a 3/2-way valve, which in the initial position connects its outlet with said supply container.
Claim 6
Dependent Claim
30 words
A hydraulic vehicle brake system as defined by claim 2, wherein said valve assembly is a 3/2-way valve, which in the initial position connects its outlet with said supply container.
Claim 7
Dependent Claim
30 words
A hydraulic vehicle brake system as defined by claim 3, wherein said valve assembly is a 3/2-way valve, which in the initial position connects its outlet with said supply container.
Claim 8
Dependent Claim
46 words
A hydraulic vehicle brake system as defined by claim 1, wherein said blocking circuit is additionally connected to a fill level indicator means of said supply container, whereby said blocking circuit is operative when the fill level of said supply container drops below a predetermined value.
Claim 9
Dependent Claim
46 words
A hydraulic vehicle brake system as defined by claim 2, wherein said blocking circuit is additionally connected to a fill level indicator means of said supply container, whereby said blocking circuit is operative when the fill level of said supply container drops below a predetermined value.
Claim 10
Dependent Claim
46 words
A hydraulic vehicle brake system as defined by claim 3, wherein said blocking circuit is additionally connected to a fill level indicator means of said supply container, whereby said blocking circuit is operative when the fill level of said supply container drops below a predetermined value.
Claim 11
Dependent Claim
46 words
A hydraulic vehicle brake system as defined by claim 4, wherein said blocking circuit is additionally connected to a fill level indicator means of said supply container, whereby said blocking circuit is operative when the fill level of said supply container drops below a predetermined value.
Claim 12
Dependent Claim
38 words
A hydraulic vehicle brake system as defined by claim 1, wherein said external power supply system comprises a pressure switch connected with said blocking circuit, whereby said blocking circuit is operative in the event of insufficient pressure generation.
Claim 13
Dependent Claim
38 words
A hydraulic vehicle brake system as defined by claim 2, wherein said external power supply system comprises a pressure switch connected with said blocking circuit, whereby said blocking circuit is operative in the event of insufficient pressure generation.
Claim 14
Dependent Claim
38 words
A hydraulic vehicle brake system as defined by claim 3, wherein said external power supply system comprises a pressure switch connected with said blocking circuit, whereby said blocking circuit is operative in the event of insufficient pressure generation.
Claim 15
Dependent Claim
38 words
A hydraulic vehicle brake system as defined by claim 4, wherein said external power supply system comprises a pressure switch connected with said blocking circuit, whereby said blocking circuit is operative in the event of insufficient pressure generation.
Claim 16
Dependent Claim
38 words
A hydraulic vehicle brake system as defined by claim 7, wherein said external power supply system comprises a pressure switch connected with said blocking circuit, whereby said blocking circuit is operative in the event of insufficient pressure generation.
References Cited (Backward Citations)
US4462642A
Cited
US4478461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |