Patent US4589706A successfully refreshed from Google Patents.
US4589706A
Expired / Lapsed
US
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Vehicle brake system for controlling wheel brake slippage and wheel drive slippage
Assignee: Robert Bosch GmbH
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Filing: 1984-11-19
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Granted: 1986-05-20
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Expires: 2004-11-19
Abstract
Abstract A vehicle brake system including a brake force booster, controllable a brake pedal, for actuating a main brake cylinder in order to supply wheel brake cylinders with braking pressure for service braking operations and also includes brake pressure control valves, which direct braking pressures into individual wheel brake cylinders if there is a danger that the wheels will lock during braking. To this end, pressure is supplied to the brake pressure control valves from the brake force booster via controlled valves. In order to be able to reduce drive slip as well, the controlled valves are embodied as a switchover valve, so that pressure can be directed to the brake pressure control valves directly from a pressure supply container bypassing the brake force booster. The vehicle brake system is inexpensively further embodied for reducing drive slip by modifying the control valves.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:57
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/48; B60T8/4809; B60T8/4827; B60T8/4836; Y; Y10; Y10S; Y10S303/00; Y10S303/90
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
196 words
A vehicle brake system for controlling wheel brake slippage and wheel drive slippage having wheel brakes for driven wheels; a brake force booster, which has a booster chamber; a main cylinder, which has at least one brake piston associated with at least one service brake circuit and acted upon by the booster chamber; a pressure source communicating with a control valve actuated by a brake pedal for directing a booster pressure into the booster chamber derived from said pressure source communicating with the control valve; brake pressure control valves associated with the wheel brakes for reducing wheel slippage; and means for temporarily connecting the booster chamber with said brake pressure control valves, a switchover valve connected between the booster chamber and the brake pressure control valves for connecting these pressure control valves with the booster chamber in the event that impermissible brake slippage arises and for connecting said pressure control valves directly with the pressure source in the event that impermissible drive slippage arises at said driven wheels and a blocking valve disposed in each said at least one service brake circuit for blocking off the main cylinder during actuation of the brake pressure control valves.
Claim 2
Dependent Claim
196 words
A vehicle brake system for controlling wheel brake slippage and wheel drive slippage having wheel brakes for driven wheels; a brake force booster, which has a booster chamber; a main cylinder, which has at least one brake piston associated with at least one service brake circuit and acted upon by the booster chamber; a pressure source communicating with a control valve actuated by a brake pedal for directing a booster pressure into the booster chamber derived from said pressure source communicating with the control valve; brake pressure control valves associated with the wheel brakes for reducing wheel slippage; and means for temporarily connecting the booster chamber with said brake pressure control valves, a switchover valve connected between the booster chamber and the brake pressure control valves for connecting these pressure control valves with the booster chamber in the event that impermissible brake slippage arises and for connecting said pressure control valves directly with the pressure source in the event that impermissible drive slippage arises at said driven wheels and a blocking valve disposed in each said at least one service brake circuit for blocking off the main cylinder during actuation of the brake pressure control valves.
Claim 3
Dependent Claim
91 words
A brake system as defined by claim 1, in which said switchover valve is embodied as a 3/2-way valve, and wherein said means for temporarily connecting said booster chamber with said brake pressure control valve is disposed following said switchover valve in the direction of the brake pressure control valves and is embodied as a 3/2-way valve and actuatable in the event of wheel slippage, and that check valves disposed between the feed valve and said at least one service brake circuit opens into the at least one service brake circuit.
Claim 4
Dependent Claim
61 words
A brake system as defined by claim 1, in which said switchover valve is embodied as a 4/3-way valve and simultaneously embodies a feed valve, said switchover valve includes one valve connection which communicates with an equalizing container and that check valves opening into the at least one service brake circuit are disposed between said switchover valve and said brake circuits.
Claim 5
Dependent Claim
58 words
A brake system as defined by claim 3, in which said blocking valves together with a control cylinder for controlling said blocking valves in common, and a control piston movable in said control cylinder, are combined into a valve combination, and that said switchover valve is further embodied as a pilot valve supplying said control cylinder with pressure.
Claim 6
Dependent Claim
65 words
A brake system as defined by claim 1, in which said brake pressure control valves are embodied such that throttling flowthrough conduits are associated with their brake pressure buildup positions, and bypass valves bypassing the brake pressure control valves for the purpose of rapid pressure reduction after service braking performed by means of the main brake cylinder are disposed beside said brake pressure control valves.
Claim 7
Dependent Claim
65 words
A brake system as defined by claim 2, in which said brake pressure control valves are embodied such that throttling flowthrough conduits are associated with their brake pressure buildup positions, and bypass valves bypassing the brake pressure control valves for the purpose of rapid pressure reduction after service braking performed by means of the main brake cylinder are disposed beside said brake pressure control valves.
Claim 8
Dependent Claim
65 words
A brake system as defined by claim 3, in which said brake pressure control valves are embodied such that throttling flowthrough conduits are associated with their brake pressure buildup positions, and bypass valves bypassing the brake pressure control valves for the purpose of rapid pressure reduction after service braking performed by means of the main brake cylinder are disposed beside said brake pressure control valves.
Claim 9
Dependent Claim
65 words
A brake system as defined by claim 4, in which said brake pressure control valves are embodied such that throttling flowthrough conduits are associated with their brake pressure buildup positions, and bypass valves bypassing the brake pressure control valves for the purpose of rapid pressure reduction after service braking performed by means of the main brake cylinder are disposed beside said brake pressure control valves.
Claim 10
Dependent Claim
23 words
A brake system as defined by claim 5, in which said bypass valves are embodied as one-way valves opening toward the main cylinder.
Claim 11
Dependent Claim
23 words
A brake system as defined by claim 6, in which said bypass valves are embodied as one-way valves opening toward the main cylinder.
Claim 12
Dependent Claim
23 words
A brake system as defined by claim 7, in which said bypass valves are embodied as one-way valves opening toward the main cylinder.
Claim 13
Dependent Claim
23 words
A brake system as defined by claim 8, in which said bypass valves are embodied as one-way valves opening toward the main cylinder.
Claim 14
Dependent Claim
34 words
A brake system as defined by claim 4, in which said bypass valves are integrated into said valve combination and are closable in common with said blocking valves by means of said control piston.
Claim 15
Dependent Claim
34 words
A brake system as defined by claim 5, in which said bypass valves are integrated into said valve combination and are closable in common with said blocking valves by means of said control piston.
Claim 16
Dependent Claim
28 words
A brake system as defined by claim 13, in which said bypass valves are openable in the direction of the main cylinder in the manner of check valves.
Claim 17
Dependent Claim
28 words
A brake system as defined by claim 14, in which said bypass valves are openable in the direction of the main cylinder in the manner of check valves.
Claim 18
Dependent Claim
29 words
A brake system as defined by claim 13, in which said check valves are integrated into said valve combination and are compulsorily openable by means of the control piston.
Claim 19
Dependent Claim
29 words
A brake system as defined by claim 15, in which said check valves are integrated into said valve combination and are compulsorily openable by means of the control piston.
Claim 20
Dependent Claim
93 words
A brake system as defined by claim 17, in which said control piston protrudes into a distributor chamber connected to said switchover valve and there is oriented centrally toward a transversely extending control beam, control tappets for opening said check valves in a direction of separate valve chambers begin at two free ends of a control beam and are oriented parallel to said control piston, and that spring plates, springs, valve rods and resilient means for controlling the said blocking valves are disposed in extensions of the control tappets following the check valves.
Claim 21
Dependent Claim
24 words
A brake system as defined by claim 4, in which said valve combination has a switching position monitoring switch actuatable by said control piston.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |