Patent US3346777A successfully refreshed from Google Patents.
Patent US4568130A successfully refreshed from Google Patents.
US4568130A
Expired / Lapsed
US
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Vehicle wheel controlled anti-brake lock braking system
Assignee: Robert Bosch GmbH
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Filing: 1984-06-14
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Granted: 1986-02-04
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Expires: 2004-06-14
Abstract
Abstract To prevent loss of brake fluid in a closed brake fluid circuit including an automatic brake anti-lock system having an automatic brake anti-lock evaluation stage (ABS), and brake fluid control valves (9-12; 40-42) controllable by the ABS stage for pressure build-up, pressure maintenance, and pressure drop, respectively, a feed valve (15, 43) is provided coupled to a source (6, 8) of pressurized brake fluid, preferably to a pilot valve which is operated by the operator brake pedal in a pilot valve chamber (6), the feed valve being hydraulically operatively connected to the pressure inlet connections of the control valve means, the feed valve being electrically connected to the ABS evaluation stage and operated, upon energization thereof, to supply pressurized brake fluid when the ABS unit responds, indicative of skidding or incipient locking of a brake. A hydraulic choke (15a, 43a) is interposed in the connection between the feed valve and the respective control valves (9-12; 40-42). To maintain separation of braking circuits (I, II), a distributor unit with check valves is provided so that pressurized brake fluid is separately fed to the respective brake circuits.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:22
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T8/00; B60T8/17; B60T8/176; B60T8/1764; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/44; B60T8/445; B60T8/50; B60T8/5018; B60T8/5025; B60T8/5031; B60T8/88; B60T8/885
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
234 words
Vehicle wheel controlled anti-brake lock braking system having an anti-brake lock system evaluation stage (ABS) coupled to receive wheel operation signals (W); a source (6, 8) of pressurized brake fluid; a main brake cylinder (1) having dual output brake fluid circuits (I, II) emanating therefrom, each brake fluid circuit including at least one brake fluid control valve means (9, 10; 11, 12; 40, 41, 42) controllable in at least two modes: (1) increase of brake fluid pressure level affecting brake fluid pressure in at least one wheel or an axle of the vehicle, (2) drainage of brake fluid to drop brake fluid pressure affecting at least one wheel or an axle of the vehicle, a feed valve (15, 43) coupled to the source (6, 8) of pressurized brake fluid and to the pressure input connections of the brake fluid control valve means (9, 10, 11, 12; 40, 41, 42), said feed valve being operatively connected to and controlled by the automatic anti-brake lock system evaluation stage (ABS) to supply pressurized brake fluid thereto; and a hydraulic choke (15a, 43a) interposed in the connection between the feed valve (15, 43) and the respective control valve means (9-12; 40-42); wherein the feed valve (15, 43) is connected to the main brake cylinder (1) to receive pressurized brake fluid therefrom, and the main brake cylinder is connected to receive pressurized brake fluid from said source (6, 8).
Claim 2
Dependent Claim
234 words
Vehicle wheel controlled anti-brake lock braking system having an anti-brake lock system evaluation stage (ABS) coupled to receive wheel operation signals (W); a source (6, 8) of pressurized brake fluid; a main brake cylinder (1) having dual output brake fluid circuits (I, II) emanating therefrom, each brake fluid circuit including at least one brake fluid control valve means (9, 10; 11, 12; 40, 41, 42) controllable in at least two modes: (1) increase of brake fluid pressure level affecting brake fluid pressure in at least one wheel or an axle of the vehicle, (2) drainage of brake fluid to drop brake fluid pressure affecting at least one wheel or an axle of the vehicle, a feed valve (15, 43) coupled to the source (6, 8) of pressurized brake fluid and to the pressure input connections of the brake fluid control valve means (9, 10, 11, 12; 40, 41, 42), said feed valve being operatively connected to and controlled by the automatic anti-brake lock system evaluation stage (ABS) to supply pressurized brake fluid thereto; and a hydraulic choke (15a, 43a) interposed in the connection between the feed valve (15, 43) and the respective control valve means (9-12; 40-42); wherein the feed valve (15, 43) is connected to the main brake cylinder (1) to receive pressurized brake fluid therefrom, and the main brake cylinder is connected to receive pressurized brake fluid from said source (6, 8).
Claim 3
Dependent Claim
57 words
System according to claim 1, wherein the main brake cylinder (1) includes a pilot cylinder-piston chamber (6); and wherein the feed valve is connected to the cylinder chamber (6) of the pilot valve to receive pressurized brake fluid under the pressure commanded by an operator pedal (7a) connected to and operating the pilot piston-cylinder chamber (6) combination.
Claim 4
Dependent Claim
89 words
System according to claim 1, wherein at least one of the brake fluid circuits has two control valve means (9, 10; 11, 12,; 40, 41); and wherein the automatic brake anti-lock system evaluation stage (ABS) includes an interlock circuit controlling the respective control valve means (9-12; 40-42) of said at least one brake fluid circuit to inhibit application of control signals tending to increase brake fluid pressure simultaneously to both the fluid control valve means (9, 10; 11, 12; 40, 41) of said at least one brake fluid circuit.
Claim 5
Dependent Claim
64 words
System according to claim 1, further including a separating valve arrangement (16; 16a, 16b) coupled between the feed valve and the pressure inlet connections of the valve means (9-12; 40-42) of respective brake fluid circuits to separate, hydraulically, said brake fluid circuits and to separately control increase of supply of pressurized brake fluid to the control valve means of the respective brake fluid circuits.
Claim 6
Dependent Claim
56 words
System according to claim 1, including shunt valve connection means (17, 18) coupled to the pressure outlet connections of the respective brake fluid control valve means (9-12; 40-42) and connected to permit decrease of pressure existing at the outlet or output of the respective brake fluid control valve means with respect to the pressure input connections.
Claim 7
Dependent Claim
47 words
System according to claim 5, wherein said shunt valve connection means (17, 18) are located in a valve unit block (16) including a connection from said hydraulic choke (15a, 43a) and a connection (50a, 50b) to the inlet of the brake fluid control valve means (9-12; 40-42).
Claim 8
Dependent Claim
63 words
System according to claim 5, further including a separating valve arrangement (16; 16a, 16b) coupled between the feed valve and the pressure inlet connections of the valve means (9-12; 40-42) of respective brake fluid circuits to separate, hydraulically, said brake fluid circuits and separately control increase of supply of pressurized brake fluid to the control valve means of the respective brake fluid circuits.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |