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US4231620A Expired / Lapsed US ⏱️ 0.0 years remaining

Anti-lock apparatus for a hydraulic brake system

Assignee: Robert Bosch GmbH
•
Filing: 1979-05-21
•
Granted: 1980-11-04
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Expires: 1999-05-21
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Abstract

Abstract An anti-lock apparatus for a pump-reinforced hydraulic brake system which includes a foot-actuated brake valve and a hydraulic main brake cylinder, the main cylinder being attached to a closed brake circuit so that in the event anti-locking is required, pressure medium is drawn from the closed brake circuit under the control of a 3/2-way valve in order to lower the pressure. This lowering of pressure is monitored via a return line by a switchover valve dependent on reservoir pressure and the withdrawal of this volume takes place by way of a check valve which only opens the passage through the return line when the pressure on the secondary side is higher than that on the primary side. The piston of the main cylinder serves to mechanically control the return flow. The brake valve has a pedal path blocking, which is made effective when the auxiliary energy supply is intact and which becomes ineffective when this supply fails.

Inventors

  • 👤 Heinz Leiber

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 07:04
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/44; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/145

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 136 words
An anti-lock apparatus for a hydraulic brake system comprising, in combination: a hydraulic main cylinder having a piston, a primary side and a secondary side for supplying a closed brake circuit, a foot-actuated brake valve, a travel-limiting spring operatively associated with said foot-actuated brake valve for permitting the pressure medium from a pressure source to be fed to said hydraulic main cylinder primary side, one 3/2-way valve and at least one 2/2-way valve operatively associated with said main cylinder for the purpose of anti-locking pressure modulation, a control line having said 3/2-way valve inserted therein leading to said primary side of said main cylinder, a return flow line disposed between said main cylinder secondary side and primary side, and a switchover valve dependent on storage container pressure for monitoring the passage of said return flow line.
Claim 2
Dependent Claim 136 words
An anti-lock apparatus for a hydraulic brake system comprising, in combination: a hydraulic main cylinder having a piston, a primary side and a secondary side for supplying a closed brake circuit, a foot-actuated brake valve, a travel-limiting spring operatively associated with said foot-actuated brake valve for permitting the pressure medium from a pressure source to be fed to said hydraulic main cylinder primary side, one 3/2-way valve and at least one 2/2-way valve operatively associated with said main cylinder for the purpose of anti-locking pressure modulation, a control line having said 3/2-way valve inserted therein leading to said primary side of said main cylinder, a return flow line disposed between said main cylinder secondary side and primary side, and a switchover valve dependent on storage container pressure for monitoring the passage of said return flow line.
Claim 3
Dependent Claim 26 words
An anti-lock apparatus in accordance with claim 1, wherein a check valve opening toward said main cylinder primary side is inserted into said return flow line.
Claim 4
Dependent Claim 32 words
An anti-lock apparatus in accordance with claim 1, including a valve controlled by said main cylinder piston for controlling the flow in said return flow line on said main cylinder secondary side.
Claim 5
Dependent Claim 62 words
An anti-lock apparatus in accordance with claim 1, wherein said brake valve and said switchover valve are disposed one behind the other in parallel relationship with said main cylinder and including a push rod, and a brake pedal, said brake valve with the interposition of said travel-limiting spring and said main cylinder being actuatable via said push rod by said brake pedal.
Claim 6
Dependent Claim 25 words
An anti-lock apparatus in accordance with claim 4, including means for blocking the pedal motion under full actuation and when the energy supply is intact.

References Cited (Backward Citations)

DE2344969A1 Cited
DE2401418A1 Cited
DE2531016A1 Cited
DE2750491A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-11-04 1984-05-05 1984-11-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-11-04 1988-05-05 1988-11-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-11-04 1992-05-05 1992-11-04 $7700.00 Window Closed / Lapsed

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