Patent US4636176A successfully refreshed from Google Patents.
Patent US4220375A successfully refreshed from Google Patents.
US4220375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking pressure control unit
Assignee: ITT Inc
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Filing: 1979-03-12
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Granted: 1980-09-02
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Expires: 1999-03-12
Abstract
Abstract A brake pressure control unit for a vehicle hydraulic brake system having two separate brake circuits to control brakes at the rear wheel of the vehicle comprising a first valve to control one of the two brake circuits, a second valve to control the other of the two brake circuits, each of the first and second valves being disposed between an inlet chamber connected to a fluid pressure source and an outlet chamber connected to a different one of the two brake circuits, a movable partition wall disposed intermediate the two brake circuits and controlling the first and second valves, a by-pass conduit by-passing one of the first and second valves, and a deceleration-responsive valve disposed in the by-pass conduit.
Inventors
- 👤 Jochen Burgdorf
- 👤 Hans-Henning Luepertz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:53
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/28; B60T11/34; B60T8/00; B60T8/18; B60T8/1812; B60T8/1831; B60T8/26; B60T8/28; B60T8/285
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
198 words
A braking pressure control unit for a vehicle hydraulic brake system having two separate brake circuits to control brakes at the rear wheels of said vehicle comprising: a housing; a first inlet chamber disposed in said housing coupled to a first fluid pressure source; a second inlet chamber disposed in said housing spaced longitudinally from said first inlet chamber coupled to a second fluid source; a first outlet chamber disposed in said housing spaced from said first and second inlet chambers connected to one of said two brake circuits; a second outlet chamber disposed in said housing spaced from said first and second inlet chambers and said first outlet chamber connected to the other of said two brake circuits; a first valve disposed in said housing between said first inlet chamber and said first outlet chamber; a second valve disposed in said housing between said second inlet chamber and said second outlet chamber; a movable partition wall disposed in said housing intermediate said first and second outlet chambers controlling said first and second valves; a by-pass conduit disposed in said housing by-passing one of said first and second valves; and a deceleration-responsive valve disposed in said by-pass conduit.
Claim 2
Dependent Claim
198 words
A braking pressure control unit for a vehicle hydraulic brake system having two separate brake circuits to control brakes at the rear wheels of said vehicle comprising: a housing; a first inlet chamber disposed in said housing coupled to a first fluid pressure source; a second inlet chamber disposed in said housing spaced longitudinally from said first inlet chamber coupled to a second fluid source; a first outlet chamber disposed in said housing spaced from said first and second inlet chambers connected to one of said two brake circuits; a second outlet chamber disposed in said housing spaced from said first and second inlet chambers and said first outlet chamber connected to the other of said two brake circuits; a first valve disposed in said housing between said first inlet chamber and said first outlet chamber; a second valve disposed in said housing between said second inlet chamber and said second outlet chamber; a movable partition wall disposed in said housing intermediate said first and second outlet chambers controlling said first and second valves; a by-pass conduit disposed in said housing by-passing one of said first and second valves; and a deceleration-responsive valve disposed in said by-pass conduit.
Claim 3
Dependent Claim
42 words
A control unit according to claim 1, wherein said first valve is disposed in a stepped piston sealed to a bore in said housing intermediate said first inlet chamber and said first outlet chamber, and said by-pass conduit by-passes said second valve.
Claim 4
Dependent Claim
17 words
A control unit according to claim 2, wherein said second valve is disposed in said partition wall.
Claim 5
Dependent Claim
28 words
A control unit according to claim 3, wherein said second valve includes a closure member bearing upon a transverse wall of said housing by means of a tappet.
Claim 6
Dependent Claim
21 words
A control unit according to claim 1, wherein one of said first and second valves is disposed in said partition wall.
Claim 7
Dependent Claim
33 words
A control unit according to claim 5, wherein said one of said first and second valves includes a closure member bearing upon a transverse wall of said housing by means of a tappet.
Claim 8
Dependent Claim
16 words
A control unit according to claim 1, wherein said first and second valves are pressure-limiting valves.
Claim 9
Dependent Claim
35 words
A control unit according to claim 7, wherein said partition wall includes two pistons sealed to a bore of said housing intermediate said first and second valves, and a spring disposed between said two pistons.
Claim 10
Dependent Claim
33 words
A control unit according to claim 1, wherein said first and second valves and said partition wall are disposed in a bore of said housing coaxial of a longitudinal axis of said bore.
Claim 11
Dependent Claim
67 words
A control unit according to claim 1, wherein said by-pass conduit includes a chamber disposed in said housing, said chamber having a fluid inlet opening and a fluid outlet opening, a first conduit connected between said fluid inlet opening and one of said first and second inlet chambers, and a second conduit connected between said fluid outlet opening and one of said first and second outlet chambers.
Claim 12
Dependent Claim
47 words
A control unit according to claim 10, wherein said deceleration-responsive valve includes a sealing ring disposed around said outlet opening in said chamber to provide a valve seat, and a ball disposed in said chamber to close said valve seat when a predetermined vehicle deceleration is exceeded.
Claim 13
Dependent Claim
40 words
A control unit according to claim 1, wherein said first valve is disposed in a piston sealed to a bore in said housing, said piston being acted upon by a control spring, and said by-pass conduit by-passes said second valve.
Claim 14
Dependent Claim
17 words
A control unit according to claim 12, wherein said second valve is disposed in said partition wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |