Patent US4380425A successfully refreshed from Google Patents.
Patent US4919495A successfully refreshed from Google Patents.
US4919495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-skid controlled hydraulic brake system
Assignee: Continental Teves AG and Co OHG
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Filing: 1988-12-20
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Granted: 1990-04-24
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Expires: 2008-12-20
Abstract
Abstract An anti-skid-controlled hydraulic brake system is described where the pressure medium, bled off from the wheel brakes for the purpose of pressure control, is replaced from a storage reservoir. The pressure medium will be delivered by a pump to the wheel brakes, and also into the master brake cylinder. As a result, during brake slip control, the volume requirements of the wheel brakes partially are met from the master brake cylinder. Directly involved is a pedal pulsation. So as to attenuate the pulsation, a throttling unit is inserted into the line between the pump and the master brake cylinder. A simple embodiment includes an orifice inserted between the pump and master brake cylinder.
Inventors
- 👤 Dieter Kircher
- 👤 Paul Schwarzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:29
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/44; B60T8/445; Y; Y10; Y10S; Y10S303/00; Y10S303/90; Y10S303/901
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
In an anti-skid controlled hydraulic brake system including a master cylinder, a pressure medium storage reservoir, at least one hydraulically controlled wheel brake connected to said master cylinder via a brake line and to said reservoir via a relief line, pressure modulation means in each of said brake and relief lines for modulating the pressure applied to said brake in response to pressure control signals, a pump having an intake connected to said reservoir and an outlet connected via a pressure line to said brake line at a location between said modulation means and said master cylinder; the improvement comprising means defining a restricted orifice in said brake line between said master cylinder and said pressure line, a bypass line connected to said brake line in parallel to said orifice, valve means in said bypass line normally biassed by a spring to an open position accommodating substantially unrestricted flow of pressure medium through said bypass line and movable to a closed position blocking flow through said bypass line when the pressure in that portion of said brake line between said master cylinder and said orifice exceeds a preselected pressure.
Claim 2
Dependent Claim
189 words
In an anti-skid controlled hydraulic brake system including a master cylinder, a pressure medium storage reservoir, at least one hydraulically controlled wheel brake connected to said master cylinder via a brake line and to said reservoir via a relief line, pressure modulation means in each of said brake and relief lines for modulating the pressure applied to said brake in response to pressure control signals, a pump having an intake connected to said reservoir and an outlet connected via a pressure line to said brake line at a location between said modulation means and said master cylinder; the improvement comprising means defining a restricted orifice in said brake line between said master cylinder and said pressure line, a bypass line connected to said brake line in parallel to said orifice, valve means in said bypass line normally biassed by a spring to an open position accommodating substantially unrestricted flow of pressure medium through said bypass line and movable to a closed position blocking flow through said bypass line when the pressure in that portion of said brake line between said master cylinder and said orifice exceeds a preselected pressure.
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |