US4776646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic vehicle brake system
Assignee: Robert Bosch GmbH
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Filing: 1987-06-17
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Granted: 1988-10-11
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Expires: 2007-06-17
Abstract
Abstract A hydraulic vehicle brake system having a brake booster integrated in a housing and having a master cylinder unit comprising at least two master cylinder pistons with corresponding pressure chambers for at least two separate brake circuits into which an anti-skid system is incorporated, and in which the brake booster and the anti-skid system communicate with a hydraulic energy supply system. The master cylinder pistons are to be disposed in the housing in an axially parallel location, radially opposite of and axially parallel with a restoring piston to be actuated by the anti-skid system. To this end, the master cylinder pistons are connected in the housing with a bushing that is axially displaceable by elements of the brake booster, and this bushing also acts upon the restoring piston.
Inventors
- 👤 Heinz Siegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:13
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/145; B60T13/146; B60T11/00; B60T11/10; B60T11/16; B60T11/20; B60T11/203; B60T11/206; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/4004; B60T8/44; B60T8/447
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
100 words
A hydraulic anti-skid and brake system for a vehicle having a brake booster integrated with a housing having an inner wall and a master cylinder unit, said master cylinder unit comprising at least two master cylinder pistons with correponding pressure chambers for supplying fluid pressure to at least two separate brake circuit lines, said brake booster and said anti-skid system being arranged to communicate with a hydraulic energy supply system, further wherein said master cylinder pistons are disposed in said housing in axially parallel locations radially opposite of and axially parallel with a restoring piston actuated by the anti-skid system.
Claim 2
Dependent Claim
100 words
A hydraulic anti-skid and brake system for a vehicle having a brake booster integrated with a housing having an inner wall and a master cylinder unit, said master cylinder unit comprising at least two master cylinder pistons with correponding pressure chambers for supplying fluid pressure to at least two separate brake circuit lines, said brake booster and said anti-skid system being arranged to communicate with a hydraulic energy supply system, further wherein said master cylinder pistons are disposed in said housing in axially parallel locations radially opposite of and axially parallel with a restoring piston actuated by the anti-skid system.
Claim 3
Dependent Claim
48 words
A brake system as defined by claim 1, in which said master cylinder pistons (40) are associated in said housing (1) with a bushing (30) which is axially displaceable by elements (20, 19, 18) of said brake booster (2), which bushing also acts upon said restoring piston (51).
Claim 4
Dependent Claim
46 words
A brake system as defined by claim 2, in which said bushing (30) is provided toward said inner wall (33) of said housing with a bushing collar (31), which overlies a ring (34) and which is adapted to surround said bushing (30) in spaced relation thereto.
Claim 5
Dependent Claim
19 words
A brake system as defined by claim 3, in which said ring (34) has a curved peripheral edge (36).
Claim 6
Dependent Claim
34 words
A brake system as defined by claim 3 in which said ring (34) has a bulged area (77), which is arranged to be received in a corresponding recess (78) of said bushing collar (31).
Claim 7
Dependent Claim
25 words
A brake system as defined by claim 3, in which said master cylinder pistons (40) and said ring (34) are associated via hinge bolts (37).
Claim 8
Dependent Claim
30 words
A brake system as defined by claim 2, in which said bushing (30) is supported toward the inner wall of said housing wall (33) with plastic guide rings (32, 76).
Claim 9
Dependent Claim
50 words
A brake system as defined by claim 1, in which said restoring piston (51) together with said housing (1) forms a variable-volume chamber (55), which communicates on the one hand with a container (8) for the hydraulic fluid and on the other hand with said hydraulic energy supply system (11).
Claim 10
Dependent Claim
25 words
A brake system as defined by claim 8, in which a reversible magnetic valve (61) is disposed between said chamber (55) and said container (8).
Claim 11
Dependent Claim
28 words
A brake system as defined by claim 8, in which a reversible magnetic valve (62) is disposed between said chamber (55) and said hydraulic energy supply system (11).
Claim 12
Dependent Claim
32 words
A brake system as defined by claim 9, in which a throttle check valve (60) is disposed between said magnetic valve (61) or optionally said magnetic valve (62) and said chamber (55).
Claim 13
Dependent Claim
30 words
A brake system as defined by claims 9, in which said chamber communicates with said brake circuit lines (4, 5), via a throttle check valve (60) and check valves (64).
Claim 14
Dependent Claim
30 words
A brake system as defined by claim 8, in which said chamber (55) communicates via a line (63) and said brake booster (2) with said hydraulic energy supply system (11).
Claim 15
Dependent Claim
46 words
A brake system as defined by claims 1, in which said master cylinder piston (40) passes through a cylindrical chamber (41) as well as its cylindrical chamber bottom (44) and thereafter forms together with said housing (1), the said pressure chamber for generating said brake pressure.
Claim 16
Dependent Claim
23 words
A brake system as defined by claim 14, in which said master cylinder piston (40) is spring-supported in the said pressure chamber (46).
Claim 17
Dependent Claim
50 words
A brake system as defined by claim 14 in which a valve (45) provided in said pressure chamber (46), includes a slide means (48) that engages a bore in said master cylinder piston (40) for closing a connecting line (75) disposed between said pressure chamber (46) and said container (8)
Claim 18
Dependent Claim
21 words
A brake system as defined by claim 16, in which said slide means (48) is provided with a longitudinal groove (50).
Claim 19
Dependent Claim
31 words
A brake system as defined by claim 16, in which said slide means is formed with a means to cooperate with a valve seat which communicates with said connecting line (75).
Claim 20
Dependent Claim
28 words
A brake system as defined by claim 16, in which said slide means further includes an elastic ring (79) which cooperates with a shoulder 80 on said piston.
Claim 21
Dependent Claim
34 words
A brake system as defined by claim 16 in which said (45, 45') is provided with an annular flange (48'), which is arranged to engaged a housing shoulder (1') for opening of said valve.
References Cited (Backward Citations)
US3927915A
Cited
DE3040562A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |