US3833271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle braking systems
Assignee: Siemens Mobility Ltd
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Filing: 1973-06-13
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Granted: 1974-09-03
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Expires: 1993-06-13
Abstract
Abstract A vehicle braking system is proposed in which the fluid pressure for braking is derived from a controlled magnet valve arrangement and in this advantageous system the supply of fluid pressure to the magnet valve arrangement is provided by a variable load valve which is arranged by being provided with a pressure responsive member which is extra to the pressure responsive member for making the output thereof vehicle load responsive. The extra pressure responsive member is thus supplied with pressure from an E.P. converter responsive to an electrical vehicle speed signal so as to oppose vehicle load pressure signals and thus make the supply of fluid pressure to the magnet valve arrangement speed and load dependent down to a given value of the electrical speed signal.
Inventors
- 👤 M Parfitt
- 👤 K Langley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:41
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/18; B60T8/1893; B60T13/00; B60T13/10; B60T13/66; B60T13/665; B60T8/32; B60T8/34; B60T8/48; B60T8/4809; B60T8/4818
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A vehicle braking system incorporating a converter by which an electical input signal the value of which is indicative of the speed of the vehicle is converted into a fluid-pressure output the value of which is dependent upon the value of the input signal; and a self-lapping fluid-pressure control valve assembly having a control portion and a valve portion controlled by the control portion to provide a fluid-pressure output the value of which is determined by the control portion; the control portion having a first pressure-responsive member to which is applicable a fluid pressure indicative of the loading of the vehicle to generate a first force, a second pressure-responsive member to which is applicable the output of the converter to generate a second force in opposition to the first force, and a third pressure-responsive member to which is applicable the output of the valve portion to generate a third force which together with the first and second forces provides a bAlance of forces in the control portion when the value of the output pressure of the valve portion is determined by the speed and the load of the vehicle.
Claim 2
Dependent Claim
189 words
A vehicle braking system incorporating a converter by which an electical input signal the value of which is indicative of the speed of the vehicle is converted into a fluid-pressure output the value of which is dependent upon the value of the input signal; and a self-lapping fluid-pressure control valve assembly having a control portion and a valve portion controlled by the control portion to provide a fluid-pressure output the value of which is determined by the control portion; the control portion having a first pressure-responsive member to which is applicable a fluid pressure indicative of the loading of the vehicle to generate a first force, a second pressure-responsive member to which is applicable the output of the converter to generate a second force in opposition to the first force, and a third pressure-responsive member to which is applicable the output of the valve portion to generate a third force which together with the first and second forces provides a bAlance of forces in the control portion when the value of the output pressure of the valve portion is determined by the speed and the load of the vehicle.
Claim 3
Dependent Claim
180 words
A vehicle braking system as claimed in claim 1 wherein the converter comprises valve means having first means a part of which is movable throughout a range of operational movement, said part being movable upon variation of an applied signal; damping means effective in operation of the valve means to damp vibrational movement of said part to a relatively small proportion of the range of operational movement of said part; resilient means to which is applicable motion of said part and which is effective to translate said motion into an output force the value of which varies with such motion; and valve closure means movable throughout a range of operational movement thereof relative to a valve seat variably to throttle escape of fluid from the valve seat and to which the resilient means applies said output force to act against the force exerted on the member in opposition thereto by the pressure of the escaping fluid, the range of operational movement of the valve closure member deing relatively small as compared to the range of operational movement of said port.
Claim 4
Dependent Claim
102 words
A vehicle braking system as claimed in claim 1 wherein the first fluid pressure is indicative of the load of the vehicle at one end only thereof, the control portion then having a further pressure-responsive member to which is applicable a further fluid pressure which is indicative of the load of the vehicle at the opposite end to generate a fourth force acting in the same direction as the first force so that the greater of the first and fourth forces has to be balanced by the second and third forces to determine the value of the output of the valve portion.
Claim 5
Dependent Claim
31 words
A vehicle braking system as claimed in claim 1, wherein the electrical input signal is indicative of the speed of the vehicle over a range of speeds above a predetermined value.
Claim 6
Dependent Claim
102 words
A vehicle braking system as claimed in claim 2, wherein the first fluid pressure is indicative of the load of the vehicle at one end only thereof, the control portion then having a further pressure-responsive member to which is applicable a further fluid pressure which is indicative of the load of the vehicle at the opposite end to generate a fourth force acting in the same direction as the first force so that the greater of the first and fourth forces has to be balanced by the second and third forces to determine the value of the output of the valve portion.
Claim 7
Dependent Claim
31 words
A vehicle braking system as claimed in claim 2 wherein the electrical input signal is indicative of the speed of the vehicle over a range of speed above a predetermined value.
Claim 8
Dependent Claim
31 words
A vehicle braking system as claimed in claim 3 wherein the electrical input signal is indicative of the speed of the vehicle over a range of speeds above a predetermined value.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |