US3835888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro hydraulic servo control valve
Assignee: Robert Bosch GmbH
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Filing: 1972-11-03
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Granted: 1974-09-17
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Expires: 1992-11-03
Abstract
Abstract An electro hydraulic servo valve has a valve slide plate mounted in a housing for angular movement between positions in which inlet and outlet conduits and consumer conduits are connected and disconnected. The permanent magnet of a transmitter turns with the valve slide plate and cooperates with flux responsive elements so that a first signal representing the position of the valve slide plate is generated, and supplied to a first input of a differential amplifier whose second input receives a second signal representing a desired position of the valve slide plate. The differential amplifier forms a differential signal representing the difference between the desired and actual positions which is supplied to the electric input of an electro fluidic transducer whose fluidic output controls a hydraulic setting motor to move the valve slide plate from the actual position to the desired position.
Inventors
- 👤 V Leutner
- 👤 R Romes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:00
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0436; F15B21/00; F15B21/08; F15B21/087; F15B9/00; F15B9/02; F15B9/06; F15B9/07; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/0655; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659; Y10T137/86606; Y10T137/86614
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
233 words
Electrohydraulic servo control valve, comprising housing means having an inlet and an outlet for a fluid, and consumer conduit means parallel to said inlet and outlet; valve slide means including a valve slide plate mounted in said housing means for angular movement about an axis parallel to said inlet, outlet, and to said consumer conduit means and in a plane transverse to said inlet, outlet, and consumer conduit means between a plurality of positions for connecting and disconnecting said consumer conduit means and said inlet and outlet; position responsive transmitter means connected with said valve slide plate for movement therewith, and including generator means for generating a first electric signal representing the actual position of said valve slide plate; differential amplifier means having a first input receiving said first electric signal, and a second input for receiving a second electric signal representing a desired position of said valve slide plate, and an output for an amplified electric differential signal representing the difference between said desired position and said actual position; electro fluidic transducer means having an electric input connected with said output so as to receive said electric differential signal, and a fluidic output for discharging fluid under the control of said electric differential signal; and hydraulic setting means connected with said fluidic output and controlled by fluid therefrom to move said valve slide plate from said actual position to said desired position.
Claim 2
Dependent Claim
233 words
Electrohydraulic servo control valve, comprising housing means having an inlet and an outlet for a fluid, and consumer conduit means parallel to said inlet and outlet; valve slide means including a valve slide plate mounted in said housing means for angular movement about an axis parallel to said inlet, outlet, and to said consumer conduit means and in a plane transverse to said inlet, outlet, and consumer conduit means between a plurality of positions for connecting and disconnecting said consumer conduit means and said inlet and outlet; position responsive transmitter means connected with said valve slide plate for movement therewith, and including generator means for generating a first electric signal representing the actual position of said valve slide plate; differential amplifier means having a first input receiving said first electric signal, and a second input for receiving a second electric signal representing a desired position of said valve slide plate, and an output for an amplified electric differential signal representing the difference between said desired position and said actual position; electro fluidic transducer means having an electric input connected with said output so as to receive said electric differential signal, and a fluidic output for discharging fluid under the control of said electric differential signal; and hydraulic setting means connected with said fluidic output and controlled by fluid therefrom to move said valve slide plate from said actual position to said desired position.
Claim 3
Dependent Claim
65 words
Servo control valve as claimed in claim 1 wherein said position responsive transmitter means includes a permanent magnet element, wherein said generator means include at least one flux responsive element, one of said elements being connected with said valve slide means for movement, and the other element being stationarily mounted on said housing means so that said flux responsive element is activated by said magnet.
Claim 4
Dependent Claim
16 words
Servo control valve as claimed in claim 2 wherein said generator means is a Hall generator.
Claim 5
Dependent Claim
38 words
Servo control valve as claimed in claim 2 wherein four flux responsive elements are connected to form a bridge circuit whereby said first signals of said generator means are independent from the play of said valve slide means.
Claim 6
Dependent Claim
27 words
Servo control valve as claimed in claim 1 wherein said position responsive transmitter means is connected with said valve slide plate for angular movement about said axis.
Claim 7
Dependent Claim
92 words
Servo control valve as claimed in claim 1 wherein said valve slide means includes a shaft secured to said valve plate and mounted in said housing means for angular movement with said valve plate between said positions; wherein said position responsive transmitter means includes a permanent magnet and an armature secured to said shaft for turning movement with said valve plate; and wherein said generator means include stationary flux responsive elements fixedly supported in said housing means, and electric conductors supported on said housing means and connected with said flux responsive elements.
Claim 8
Dependent Claim
95 words
Servo control valve as claimed in claim 1 wherein said valve slide means includes angularly spaced tubular members penetrating said valve slide plate parallel to said axis; wherein said housing means includes surfaces on opposite sides of said valve slide plate, one of said surfaces having ports for said inlet and outlet, and for said consumer conduit means, and the other surface having pressure chambers located opposite said ports so that said tubular members connect said ports with said pressure chambers when registering with said ports in predetermined angular positions of said valve slide plate.
Claim 9
Dependent Claim
37 words
Servo control valve as claimed in claim 7 wherein said valve slide plate has opposite end faces having projecting ridges forming areas of equal pressure communicating with each other and including a space communicating with said inlet.
Claim 10
Dependent Claim
107 words
Servo control valve as claimed in claim 1 wherein, said valve slide plate has a radial projection; and wherein said hydraulic setting motor includes two cylinders located on opposite sides of said projection, and two pistons in said cylinders engaging said projection on opposite sides, respectively, when pressure fluid is supplied by said fluidic output of said fluidic transducer means to said cylinders; wherein said fluidic output includes two output conduits connected with said cylinders, respectively; and wherein said fluidic transducer means includes means controlled by said differential signal to produce different pressures in said output conduits and cylinders so that said valve slide plate is turned.
Claim 11
Dependent Claim
14 words
Servo control valve as claimed in claim 9 wherein saiD pistons are spherical balls.
Claim 12
Dependent Claim
120 words
Servo control valve as claimed in claim 1 wherein said housing means includes three bodies having abutting faces, the first body being an end wall located at one end of said housing means, and formed with said inlet, said outlet, and with two consumer conduits constituting said consumer conduit means; the second body being an end member at the other end of said housing means having a cavity in which said position responsive transmitter means is located, and having an end face on which said differential amplifier means and said electro fluidic transducer means are mounted; and the third body being located intermediate said first and second bodies and having a cavity in which said valve slide plate is located.
Claim 13
Dependent Claim
34 words
Servo control valve as claimed in claim 11 wherein said housing means includes a cap attached to said end face of said second body and enclosing said differential amplifier means and said transducer means.
Claim 14
Dependent Claim
56 words
Servo control valve as claimed in claim 11 wherein said valve slide means includes a shaft carrying said valve plate in said cavity and being mounted in said first and second bodies for angular movement with said valve plate; and wherein said position responsive transmitter means includes means secured to said shaft in said second body.
Claim 15
Dependent Claim
71 words
Servo control valve as claimed in claim 1 wherein said position responsive transmitter means includes a permanent magnet and an armature connected with said valve slide plate for angular movement, said magnet and armature forming gaps permeated by magnetic flux, and wherein said generator means includes stationary flux responsive elements located in the path of said gaps and located in the same in predetermined angular positions of said valve slide plate.
Claim 16
Dependent Claim
32 words
Servo control valve as claimed in claim 1 wherein said differential amplifier is an electronic amplifier adapted to respond to electronic second signals representing a desired position of said valve slide means.
Claim 17
Dependent Claim
32 words
Servo control valve as claimed in claim 15 wherein said electronic amplifier is adapted to receive second signals not greater than 1 mA, and has an input resistance higher than 10,000 Ohm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |