US4346944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic main brake cylinder
Assignee: Robert Bosch GmbH
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Filing: 1980-05-05
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Granted: 1982-08-31
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Expires: 2000-05-05
Abstract
Abstract A hydraulic main brake cylinder is proposed, in the housing of which at least one part of the switching members of an anti-locking apparatus is integrated. The switching members are either plunger pistons or restoring pistons or a combination of the two, which are triggered by multiple-position valves. In this manner, not only is the structural expense very low, but additional advantages are also attained in terms of safety. The hydraulic main brake cylinder is particularly well suited to application in the brake system of passenger vehicles and lightweight trucks.
Inventors
- 👤 Heinz Leiber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:31
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4004; B60T17/00; B60T17/18; B60T17/22; B60T8/36; B60T8/3615; B60T8/363; B60T8/3635; B60T8/42; B60T8/4208; B60T8/4225; Y; Y10; Y10S; Y10S303/00; Y10S303/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A multiple brake system including: a hydraulic main cylinder to provide brake pressure having a main piston and a housing, a plurality of wheel brake cylinders; a brake line for hydraulic connection of the main cylinder and the plurality of wheel brake cylinders; and an anti-locking apparatus which includes; a first switching member having a plunger piston connected in the brake line to control hydraulic connection of main cylinder and the plurality of wheel brake cylinders such that when the first switching member opens, the brake pressure of the main cylinder is reduced; a second switching member having a restoring piston which is connected to the main cylinder to be integral with the housing and mechanically connected to bias the main piston; and a plurality of magnetic valves connected to the plurality of wheel brake cylinders to monitor brake pressure
Claim 2
Dependent Claim
140 words
A multiple brake system including: a hydraulic main cylinder to provide brake pressure having a main piston and a housing, a plurality of wheel brake cylinders; a brake line for hydraulic connection of the main cylinder and the plurality of wheel brake cylinders; and an anti-locking apparatus which includes; a first switching member having a plunger piston connected in the brake line to control hydraulic connection of main cylinder and the plurality of wheel brake cylinders such that when the first switching member opens, the brake pressure of the main cylinder is reduced; a second switching member having a restoring piston which is connected to the main cylinder to be integral with the housing and mechanically connected to bias the main piston; and a plurality of magnetic valves connected to the plurality of wheel brake cylinders to monitor brake pressure
Claim 3
Dependent Claim
77 words
A multiple brake system as defined in claim 1, wherein the plurality of wheel brake cylinders comprises a first set of wheel brake cylinders and a second set of wheel brake cylinders, wherein the brake line is connected to the first set of wheel brake cylinders such that the first switching member controls the first set of wheel brake cylinders, and wherein the second switching member is connected to control the second set of wheel brake cylinders.
Claim 4
Dependent Claim
61 words
A multiple brake system as defined in claim 2, the anti-locking apparatus also including: a pressure source; an auxiliary circuit connecting the pressure source to the first switching member, having a 3/2-way magnetic valve which controls connection of the pressure source to the first switching member; and two 2/2-way magnetic valves connected to control the first set of wheel brake cylinders.
Claim 5
Dependent Claim
20 words
A multiple brake system as defined in claim 3, wherein the 3/2-way magnetic valve comprises in part a check valve.
Claim 6
Dependent Claim
34 words
A main brake cylinder as defined by claim 3, further including diagonal brake circuit distribution, characterized in that said 2/2-way magnetic valves are provided with an anticipatory control means comprising a 3/2-way magnetic valve.
Claim 7
Dependent Claim
61 words
A multiple brake system as defined in claim 2, the anti-locking apparatus also including: a pressure source; an auxiliary circuit connecting the pressure source to the first switching member, having a 3/3-way magnetic valve which controls connection of the pressure source to the first switching member; and two 2/2-way magnetic valves connected to control the first set of wheel brake cylinders.
Claim 8
Dependent Claim
47 words
A multiple brake system as defined in claim 2, the anti-locking apparatus also including: a pressure source; an auxiliary circuit connecting the pressure source to the second switching member, having 3/2-way valve with a throttle which controls connection of the pressure source to the second switching member.
References Cited (Backward Citations)
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Cited
US3549212A
Cited
US3729235A
Cited
US3768874A
Cited
US4025124A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |