Patent US4783125A successfully refreshed from Google Patents.
US4783125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slip-controlled hydraulic brake system
Assignee: Continental Teves AG and Co OHG
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Filing: 1987-06-09
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Granted: 1988-11-08
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Expires: 2007-06-09
Abstract
Abstract A slip-controlled hydraulic brake system which comprises a master cylinder and an auxiliary-pressure supply system is equipped with a travel-responsive switch actuatable by a piston of the master cylinder. An auxiliary-pressure supply system is used for the purpose of pressure delivery during the stop control phase and to safeguard a reserve volume or reserve stroke in the pressure chambers of the master cylinder. To this end, the auxiliary-pressure supply system will be activated and, if need be, check valves will be changed over on attainment of a limit value by virtue of the travel-responsive switch.
Inventors
- 👤 Juan Belart
- 👤 Jochen Burgdorf
- 👤 Wolfram Seibert
- 👤 Norbert Ocvirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:12
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/404; B60T8/4054; B60T13/00; B60T13/10; B60T13/12; B60T8/341; B60T8/4045; B60T8/44; B60T8/445; B60T8/88; B60T8/92; B60T8/94
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A slip-controlled hydraulic brake system comprising a master cylinder having at least one pressure chamber, wheel brakes connected to the master cylinder and braking pressure control valves between the master cylinder and the wheel brakes, an auxiliary-pressure supply system for introducing fluid pressure to the wheel brakes when it is detected that a wheel is slipping, means for preserving a reserve volume of pressure fluid in the pressure chamber of the master cylinder by introducing pressure fluid out of the auxiliary-pressure supply system when the quantity if pressure fluid drops below a predetermined limit value, said means being operative when the brakes are operative in response to other than detection that a wheel is slipping, further including means for monitoring the piston travel in the master cylinder and for the introduction of pressure fluid out of the auxiliary-pressure supply system when the piston travel attains a predetermined limit value.
Claim 2
Dependent Claim
149 words
A slip-controlled hydraulic brake system comprising a master cylinder having at least one pressure chamber, wheel brakes connected to the master cylinder and braking pressure control valves between the master cylinder and the wheel brakes, an auxiliary-pressure supply system for introducing fluid pressure to the wheel brakes when it is detected that a wheel is slipping, means for preserving a reserve volume of pressure fluid in the pressure chamber of the master cylinder by introducing pressure fluid out of the auxiliary-pressure supply system when the quantity if pressure fluid drops below a predetermined limit value, said means being operative when the brakes are operative in response to other than detection that a wheel is slipping, further including means for monitoring the piston travel in the master cylinder and for the introduction of pressure fluid out of the auxiliary-pressure supply system when the piston travel attains a predetermined limit value.
Claim 3
Dependent Claim
57 words
A brake system as claimed in claim 1, further including means for monitoring the advance movement of a push rod which couples a brake pedal to the master cylinder or to a brake power booster connected upstream thereof and for introducing said pressure fluid out of the auxiliary-pressure supply system upon attainment of a predetermined limit value.
Claim 4
Dependent Claim
30 words
A brake system as claimed in claim 1, wherein a brake power booster is connected upstream of the master cylinder, said system further including means for monitoring the booster stroke.
Claim 5
Dependent Claim
38 words
A brake system as claimed in claim 1, wherein the master cylinder is a tandem master cylinder, and in that the stroke of the push rod piston and/or of the floating piston associated with the cylinder is monitored.
Claim 6
Dependent Claim
153 words
A slip-controlled hydraulic brake system comprising a master cylinder having at least one pressure chamber, wheel brakes connected to the master cylinder and braking pressure control valves between the master cylinder and the wheel brakes, an auxiliary-pressure supply system for introducing fluid pressure to the wheel brakes when it is detected that a wheel is slipping, means for preserving a reserve volume of pressure fluid in the pressure chamber of the master cylinder by introducing pressure fluid out of the auxiliary-pressure supply system when the quantity of pressure fluid drops below a predetermined limit value, said means being operative when the brakes are operative in response to other than detection that a wheel is slipping, further including switches operative to switch on the auxiliary-pressure supply system and/or bring about the introduction of pressure fluid into the pressure chamber or the pressure chambers of the master cylinder when the predetermined limit value is exceeded.
Claim 7
Dependent Claim
153 words
A slip-controlled hydraulic brake system comprising a master cylinder having at least one pressure chamber, wheel brakes connected to the master cylinder and braking pressure control valves between the master cylinder and the wheel brakes, an auxiliary-pressure supply system for introducing fluid pressure to the wheel brakes when it is detected that a wheel is slipping, means for preserving a reserve volume of pressure fluid in the pressure chamber of the master cylinder by introducing pressure fluid out of the auxiliary-pressure supply system when the quantity of pressure fluid drops below a predetermined limit value, said means being operative when the brakes are operative in response to other than detection that a wheel is slipping, further including switches operative to switch on the auxiliary-pressure supply system and/or bring about the introduction of pressure fluid into the pressure chamber or the pressure chambers of the master cylinder when the predetermined limit value is exceeded.
Claim 8
Dependent Claim
22 words
A brake system as claimed in claim 5, wherein the travel-responsive switch is actuated by a working piston in the master cylinder.
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |