US3593523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrohydraulic remote control of hydraulic directional valves
Assignee: Robert Bosch GmbH
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Filing: 1969-10-30
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Granted: 1971-07-20
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Expires: 1989-10-30
Abstract
Abstract An arrangement for the electrohydraulic remote control of directional valve in which a variable displacement pump provides fluid under pressure to a load or a hydraulically operated device. Signal transducers are arranged at the pump and the load to provide electrical signals as a function of the pressures prevailing at the pump and the load. An electrical control unit compares the signals from the transducers, and is operatively connected to an electrohydraulic actuated positioning means in the pump when the signals correspond. The regulation is such that the fluid flow from the pump is controlled as a function of the load magnitude.
Inventors
- 👤 Heniz Flaschar
- 👤 Walter Werner
- 👤 Wilhelm Weigert
- 👤 Manfred Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:30
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
An arrangement for electrohydraulic remote control of valves, comprising, in combination, variable-displacement pump means for providing fluid under pressure; electrohydraulic actuated positioning means in said variable-displacement pump means; load means for receiving said fluid from said variable-displacement pump means; first signal transducer means communicating with said variable-displacement pump means and providing a signal dependent upon the fluid pressure at said variable-displacement pump means; second signal transducer means communicating with said load means and providing a signal dependent upon the fluid pressure at said load means; and control means connected to said first and second signal transducer means for comparing said signals therefrom, said control means being operatively connected to said positioning means for controlling fluid flow from said variabledisplacement pump means to said load means as a function of the magnitude of said load means.
Claim 2
Dependent Claim
135 words
An arrangement for electrohydraulic remote control of valves, comprising, in combination, variable-displacement pump means for providing fluid under pressure; electrohydraulic actuated positioning means in said variable-displacement pump means; load means for receiving said fluid from said variable-displacement pump means; first signal transducer means communicating with said variable-displacement pump means and providing a signal dependent upon the fluid pressure at said variable-displacement pump means; second signal transducer means communicating with said load means and providing a signal dependent upon the fluid pressure at said load means; and control means connected to said first and second signal transducer means for comparing said signals therefrom, said control means being operatively connected to said positioning means for controlling fluid flow from said variabledisplacement pump means to said load means as a function of the magnitude of said load means.
Claim 3
Dependent Claim
33 words
The arrangement as defined in claim 1 including electrohydraulically actuated valve means connected in parallel with said positioning means; and means for operatively connecting said electrohydraulically actuated valve means with said control means.
Claim 4
Dependent Claim
92 words
The arrangement as defined in claim 1 wherein said electrohydraulic actuated positioning means comprises piston means; a pressure chamber communicating with said piston means; first electromagnetic valve means connected to said pressure chamber; first fluid channel means connected to first electromagnetic valve means and communicating with said pressure chamber through said first electromagnetic valve means; second electromagnetic valve means connected to said pressure chamber; and return flow channel means connected to said second electromagnetic valve means, said return flow channel means communicating with said pressure chamber through said second electromagnetic valve means.
Claim 5
Dependent Claim
63 words
The arrangement as defined in claim 2 wherein said electrohydraulically actuated valve comprises an adjustable pressure-limiting valve with spring-loaded closure means; channel means communicating with the pressure side of said pump means; and return flow channel means, said pressure-limiting valve separating said channel means communicating with the pressure side of said pump means from said return flow channel means through said closure means.
Claim 6
Dependent Claim
123 words
The arrangement as defined in claim 4 including a piston In said pressure-limiting valve; spring means for spring loading said closure means and abutting said piston on one side thereof; a pressure chamber on the other side of said piston lying opposite to the side abutted by said spring means; first electromagnetic valve means connected with said pressure chamber; pressure channel means communicating with the pressure side of said pump means, said pressure channel means communicating with said pressure chamber through said first electromagnetic valve means; second electromagnetic valve means connected with said pressure chamber; and return flow channel means connected with said second electromagnetic valve means, said return flow channel means communicating with said pressure chamber through said second electromagnetic valve means.
Claim 7
Dependent Claim
31 words
The arrangement as defined in claim 5 including third signal transducer means arranged at said piston; and means for operatively connecting said first and second electromagnetic valves with said control means.
Claim 8
Dependent Claim
24 words
The arrangement as defined in claim 4 including a pressure channel communicating with said pump means; and a pressure-retaining valve in said pressure channel.
Claim 9
Dependent Claim
34 words
The arrangement as defined in claim 2 including feed pump means with pressure channel, said electrohydraulically actuated valve controlling said pressure channel of said feed pump and being operatively connected to said control means.
Claim 10
Dependent Claim
23 words
The arrangement as defined in claim 8 including pressure-limiting valve means for the pressure sides of said pump means and said feed pump.
Claim 11
Dependent Claim
121 words
The arrangement as defined in claim 1 wherein said electrohydraulic actuated positioning means comprises a differential piston; spring means for maintaining said differential piston in a zero reset position; a first chamber communicating with one side of said differential piston; first electromagnetic valve means communicating with said first chamber; return flow line means connected with said first electromagnetic valve means, said return flow line means communicating with said first chamber through first electromagnetic valve means; a second chamber communicating with the other side of said differential piston; second electromagnetic valve means connected between said first chamber and said second chamber; and pressure channel means communicating with the pressure side of said pump means, said second chamber communicating with said pressure channel.
Claim 12
Dependent Claim
28 words
The arrangement as defined in claim 1 including discharging means for bypassing the fluid for positioning said variable-displacement pump; said discharging means being arranged with said positioning means.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |