US3914942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo-assisted fluid supply systems
Assignee: AlliedSignal Automotive Espana SA
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Filing: 1974-05-13
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Granted: 1975-10-28
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Expires: 1994-05-13
Abstract
Abstract In a fluid supply system having a servo-motor which when actuated assists the pistons of a plurality of independent amplifier cylinders to deliver working fluid to the respective outputs. Actuating means for the servo-motor are provided which actuate the servo-motor when the control fluid pressure in any one of the amplifier cylinders reaches a respective predetermined level, so that failure of one amplifier cylinder or one output does not impair the working of the servo-motor.
Inventors
- 👤 Juan Simon Bacardit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:45
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/101; B60T11/28; B60T11/32; B60T11/323; B60T13/00; B60T13/10; B60T13/24; B60T13/241; B60T13/242; B60T13/245
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
360 words
In a fluid pressure system supply source means for supplying fluid under pressure, a plurality of amplifier cylinder means respectively communicating with said supply source means for receiving fluid under pressure therefrom, said plurality of amplifier cylinder means respectively having pistons therein, servo means common to said plurality of amplifier cylinder means and including a servo piston operatively connected with the plurality of pistons of said plurality of amplifier cylinder means, said servo means including a single servo cylinder housing said servo piston and defining therewith a pair of chambers respectively situated on opposite sides of said servo piston, a relatively low fluid pressure source communicating with one of said chambers, servo-valve means communicating with said plurality of amplifier cylinder means, with said chambers of said servo cylinder, , and with a relatively higH fluid pressure source of fluid at pressure substantially higher than the pressure of the fluid of said relatively low pressure source which communicates with said one chamber, for normally maintaining pressures in both chambers on opposite sides of said servo piston equalized at the pressure of said relatively low fluid pressure source and for automatically responding to an increase in fluid pressure in said amplifier cylinders, derived from said supply source, to a predetermined value for maintaining said one chamber at said relatively low pressure while placing the other of said chambers in communication with said relatively high fluid pressure source for displacing said servo piston to act additionally on said pistons in said plurality of amplifier cylinder means with the differential pressure acting on said servo piston, a plurality of output circuits respectively communicating with said plurality of amplifier cylinder means for receiving fluid under amplified pressure therefrom, and selector means operatively connected with said servo-valve means for operating the latter automatically with fluid under pressure in any one of said plurality amplifier cylinder means which reaches said predetermined value, so that if one of said plurality of amplifier cylinder means does not have a fluid pressure which reaches said predetermined value another one of which has a fluid pressure reaching said predetermined value will serve to actuate said servo-valve means through said selector means.
Claim 2
Dependent Claim
360 words
In a fluid pressure system supply source means for supplying fluid under pressure, a plurality of amplifier cylinder means respectively communicating with said supply source means for receiving fluid under pressure therefrom, said plurality of amplifier cylinder means respectively having pistons therein, servo means common to said plurality of amplifier cylinder means and including a servo piston operatively connected with the plurality of pistons of said plurality of amplifier cylinder means, said servo means including a single servo cylinder housing said servo piston and defining therewith a pair of chambers respectively situated on opposite sides of said servo piston, a relatively low fluid pressure source communicating with one of said chambers, servo-valve means communicating with said plurality of amplifier cylinder means, with said chambers of said servo cylinder, , and with a relatively higH fluid pressure source of fluid at pressure substantially higher than the pressure of the fluid of said relatively low pressure source which communicates with said one chamber, for normally maintaining pressures in both chambers on opposite sides of said servo piston equalized at the pressure of said relatively low fluid pressure source and for automatically responding to an increase in fluid pressure in said amplifier cylinders, derived from said supply source, to a predetermined value for maintaining said one chamber at said relatively low pressure while placing the other of said chambers in communication with said relatively high fluid pressure source for displacing said servo piston to act additionally on said pistons in said plurality of amplifier cylinder means with the differential pressure acting on said servo piston, a plurality of output circuits respectively communicating with said plurality of amplifier cylinder means for receiving fluid under amplified pressure therefrom, and selector means operatively connected with said servo-valve means for operating the latter automatically with fluid under pressure in any one of said plurality amplifier cylinder means which reaches said predetermined value, so that if one of said plurality of amplifier cylinder means does not have a fluid pressure which reaches said predetermined value another one of which has a fluid pressure reaching said predetermined value will serve to actuate said servo-valve means through said selector means.
Claim 3
Dependent Claim
78 words
The combination of claim 1 and wherein said servo-valve means includes a plurality of servo-valves respectively communicating with said plurality of amplifier cylinder means and each communicating with said relatively high fluid pressure source, said selector means being connected between said plurality of servo-valves and said other chamber for providing communication between said other chamber and at least one of said servo-valves which communicates with an amplifier cylinder means having therein a pressure which reaches said predetermined value.
Claim 4
Dependent Claim
59 words
The combination of claim 1 and wherein said servo-valve means includes a single servo-valve communicating with said plurality of amplifier cylinder means and said selector means being connected between said plurality of amplifier cylinder means and said single servo-valve for operating the latter with pressure from at least one amplifier cylinder means wherein the pressure reaches said predetermined value.
Claim 5
Dependent Claim
85 words
The combination of claim 1 and wherein said servo-valve means includes a single servo-valve communicating with said plurality of amplifier cylinder means, said selector means including in said servo-valve a single cylinder and a plurality of pistons in said single cylinder and respectively communicating through said single servo-valve with said plurality of amplifier cylinder means so that at least one of the latter pistons can respond to fluid pressure in at least one amplifier cylinder means which reaches said predetermined value for actuating said servo-valve.
Claim 6
Dependent Claim
77 words
The combination of claim 1 and wherein said supply source means, said plurality of amplifier cylinder means, and said plurality of output circuit means are hydraulic while said servo means, said relatively low fluid pressure source and said relatively high fluid pressure source are pneumatic with said servo-valve means having a hydraulic portion cooperating with said plurality of amplifier cylinder means and a pneumatic portion cooperating with said servo means and said relatively high fluid pressure source.
Claim 7
Dependent Claim
30 words
The combination of claim 5 and wherein said plurality of output circuits respectively deliver fluid under pressure to brakes of a vehicle, said supply source means being a master cylinder.
Claim 8
Dependent Claim
35 words
The combination of claim 6 and wherein said source of relatively low fluid pressure is an intake manifold of an engine of the vehicle while said relatively high fluid pressure source is the outer atmosphere.
Claim 9
Dependent Claim
53 words
The combination of claim 1 and wherein a differential accuMulator means communicates with said plurality of output circuits for compensating for differences in consumption of fluid by said plurality of output circuits while having a capacity small enough not to impair the functioning of one of said output circuits if another one fails.
Claim 10
Dependent Claim
207 words
The combination of claim 1 and wherein said source of relatively high pressure is the outer atmosphere while said source of relatively low pressure provides less than atmospheric pressure, said servovalve means having an outer portion communicating with the outer atmosphere, an inner portion communicating with said one chamber, and an intermediate portion situated between said outer and inner portions and communicating with said other chamber, an outer normally closed valve situated between said outer and intermediate portions for normally preventing communication between the outer atmosphere and said intermediate portion, and an inner normally open valve providing normally communication between said intermediate and inner portions for normally maintaining said chambers on opposite sides of said servo piston at an equalized pressure equal to the pressure of said relatively low fluid pressure source, said servo-valve means including a cylinder communicating with at least one of said amplifier cylinder means and a piston in the latter cylinder operatively connected with said inner and outer valves for closing said normally open inner valve and opening said normally closed outer valve when fluid under pressure in said one amplifier cylinder means acts on said piston in said cylinder of said servo-valve means upon reaching a pressure equal to said predetermined value.
Claim 11
Dependent Claim
113 words
The combination of claim 9 and wherein said outer valve has a stationary valve seat and movable valve-closure member cooperating therewith while said inner valve has a movable valve seat connected directly to said piston of said servo-valve means and a movable valve closure member connected with said movable valve closure member of said outer valve, the latter piston acting on said movable seat for first closing said inner valve and then acting through said movable valve closure member of said inner valve to displace said movable valve closure member of said outer valve away from said stationary valve seat thereof for opening said outer valve subsequent to closing of said inner valve.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |