US4428623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake force amplifier for a multiple circuit brake system
Assignee: Robert Bosch GmbH
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Filing: 1981-06-22
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Granted: 1984-01-31
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Expires: 2001-06-22
Abstract
Abstract A brake force amplifier for a multiple-circuit brake system. The brake force amplifier has a multiple-circuit brake valve, parallel to which a switching valve is provided. This switching valve is actuated by a main cylinder pressure in exactly the same manner as the brake valve. When there is no pressure available in a presurizing apparatus supplying the brake force amplifier with pressure medium, the switching valve keeps the brake valve ineffective. When a brake force amplifier of this kind is used in an anti-skid apparatus, an apparatus is created which has lower cost, lower weight and a smaller structural volume than known designs and the function of which is improved in terms of noise and retroactive effect on the pedal. The brake force amplifier is intended for a multiple-circuit brake system for motor vehicles.
Inventors
- 👤 Hannes Bertling
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:22
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4072; B60T8/4081; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/147; B60T8/44; B60T8/445
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A brake force amplifier for a multiple-circuit brake system for motor vehicles, including a main cylinder, a multiple-circuit brake valve actuatable by fluid pressure from said main cylinder, said valve further arranged to effect an amplification in brake circuits which is proportional to the main cylinder pressure, a pressurizing system substantially comprising a pump and a reservoir for supplying fluid under pressure to said main cylinder, a switching valve provided in parallel to the multiple-circuit brake valve, said switching valve being actuatable by the main cylinder pressure and arranged to maintain said multiple-circuit brake valve ineffective if the pressurizing system has no pressure available for said system, a travel simulator subjected to fluid pressure in at least one pressure line leading from said main cylinder to said multiple-circuit brake valve and said travel simulator is provided with a travel limiting spring valve.
Claim 2
Dependent Claim
142 words
A brake force amplifier for a multiple-circuit brake system for motor vehicles, including a main cylinder, a multiple-circuit brake valve actuatable by fluid pressure from said main cylinder, said valve further arranged to effect an amplification in brake circuits which is proportional to the main cylinder pressure, a pressurizing system substantially comprising a pump and a reservoir for supplying fluid under pressure to said main cylinder, a switching valve provided in parallel to the multiple-circuit brake valve, said switching valve being actuatable by the main cylinder pressure and arranged to maintain said multiple-circuit brake valve ineffective if the pressurizing system has no pressure available for said system, a travel simulator subjected to fluid pressure in at least one pressure line leading from said main cylinder to said multiple-circuit brake valve and said travel simulator is provided with a travel limiting spring valve.
Claim 3
Dependent Claim
21 words
A brake force amplifier as defined by claim 1, characterized in that each of said brake circuits, includes a travel simulator.
Claim 4
Dependent Claim
19 words
A brake force amplifier as defined by claim 1, characterized in that said switching valve comprises a spool valve.
Claim 5
Dependent Claim
32 words
A brake force amplifier as defined by claim 1, characterized in that said brake valve further includes a slide, said slide arranged to serve as a blocking member for said travel simulator.
Claim 6
Dependent Claim
26 words
A brake force amplifier as defined by claim 1, characterized in that said brake force amplifier is structurally combined with an anti-skid apparatus comprising magnetic valves.
References Cited (Backward Citations)
US3503655A
Cited
US3514161A
Cited
GB1268932A
Cited
US3702713A
Cited
US3827759A
Cited
US4264109A
Cited
FR2327124A1
Cited
DE3024184A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |