Patent US5033800A successfully refreshed from Google Patents.
US5033800A
Expired / Lapsed
US
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Anti-skid brake system
Assignee: Robert Bosch GmbH
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Filing: 1990-06-22
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Granted: 1991-07-23
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Expires: 2010-06-22
Abstract
Abstract A vehicle brake system having an anti-skid system with, at least one anti-skid valve assembly disposed in a brake line that leads from the master brake cylinder to the wheel brake. To pump pressure fluid out of the wheel brake to the master brake cylinder, a return feed line is provided. Located in the return feed line, in succession in the pumping direction following a pressure fluid reservoir, are a throttle and a return feed pump driven by an electric motor. In order to keep the feedback at the brake pedal slight during an anti-skid control event involving small quantities of pressure fluid to be returned, yet to make sufficiently large quantities of pressure fluid available in the master brake cylinder upon major brake pressure reduction, the following provisions are made: The pumping flow of the return pump can be increased with increasing pressure in the pressure fluid reservoir and/or upon attainment of a predetermined fill level in the pressure fluid reservoir and/or with an increasing volumetric flow of pressure fluid to be pumped back out of the wheel brake.
Inventors
- 👤 Karl-Heinz Willmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:54
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/40; B60T8/404; B60T8/4059; B60T8/42; B60T8/4275; B60T8/4291; Y; Y10; Y10S; Y10S303/00; Y10S303/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
An anti-skid system (20) which is connected between a master brake cylinder (11) and at least one wheel brake (14) of a vehicle, which comprises an anti-skid valve assembly in a brake line leading from the master brake cylinder to the wheel brake, a fluid return feed line (26) connected to said anti-skid valve assembly, to a pressure fluid reservoir (28), and to a fluid return connection of a feed pump (35) disposed downstream of said pressure fluid reservoir (28), said feed pump is driven by an electric motor for pumping pressure fluid out of said at least one wheel brake to the master brake cylinder (11), a throttle (27) in said return feed line (26) between said feed pump (35) and said pressure fluid reservoir (28), means for controlling the pumping flow of said return feed pump, in which the pumping flow of the return feed pump (35) is increased with increasing pressure in the pressure fluid reservoir (28) with one of either attainment of a predetermined fill level in the pressure fluid reservoir (28) and attainment of an increasing volumetric flow of pressure fluid to be pumped back out of the wheel brake (14).
Claim 2
Dependent Claim
196 words
An anti-skid system (20) which is connected between a master brake cylinder (11) and at least one wheel brake (14) of a vehicle, which comprises an anti-skid valve assembly in a brake line leading from the master brake cylinder to the wheel brake, a fluid return feed line (26) connected to said anti-skid valve assembly, to a pressure fluid reservoir (28), and to a fluid return connection of a feed pump (35) disposed downstream of said pressure fluid reservoir (28), said feed pump is driven by an electric motor for pumping pressure fluid out of said at least one wheel brake to the master brake cylinder (11), a throttle (27) in said return feed line (26) between said feed pump (35) and said pressure fluid reservoir (28), means for controlling the pumping flow of said return feed pump, in which the pumping flow of the return feed pump (35) is increased with increasing pressure in the pressure fluid reservoir (28) with one of either attainment of a predetermined fill level in the pressure fluid reservoir (28) and attainment of an increasing volumetric flow of pressure fluid to be pumped back out of the wheel brake (14).
Claim 3
Dependent Claim
27 words
An anti-skid system as defined in claim 1, in which one of either a rpm and the pumping volume of the return feed pump (35) is variable.
Claim 4
Dependent Claim
56 words
An anti-skid system as defined by claim 1, in which said pressure fluid reservoir (28) is in the form of a cylinder (29) having a movable piston (31) therein, and the pumping flow of the return feed pump (35) is controllable as a function of the position of the piston (31) within said pressure fluid reservoir.
Claim 5
Dependent Claim
64 words
An anti-skid system as defined by claim 1, which includes a cylinder (29) a movable piston (31) that forms a pressure fluid reservoir (28), a line (34) having a check valve (33) is connected to the cylinder (29), said line (34) bypassing the throttle (27), and said line (34) is openable by said piston (31) with the cylinder (29) at least approximately half filled.
Claim 6
Dependent Claim
66 words
An anti-skid system as defined by claim 1, having a pressure fluid reservoir (28.2) that includes a movable piston (31.2), a shutoff valve (41.2) provided in a line (34.2) that bypasses the pressure fluid reservoir (28.2) and the throttle (27.2), said shutoff valve can be switched into its open position by said piston (31.2) if the pressure fluid reservoir (28.2) is at least approximately half filled.
Claim 7
Dependent Claim
45 words
An anti-skid system as defined by claim 1, which includes a bypass line (51.3) for the throttle (27.3) said bypass line is provided with a pressure actuated 2/2-way valve (52.3), which opens the bypass line at a predetermined pressure in the pressure fluid reservoir (28.3).
Claim 8
Dependent Claim
27 words
An anti-skid system as defined by claim 1, in which said throttle (27.4) is pressure-adjustable as a function of the pressure in the pressure fluid reservoir (28.4).
References Cited (Backward Citations)
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GB2036216A
Cited
US4640558A
Cited
US4608870A
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US4715667A
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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) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |