US3612103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflectable free jetstream-type two-stage servo valve
Assignee: Moog Inc
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Filing: 1969-07-01
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Granted: 1971-10-12
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Expires: 1989-07-01
Abstract
Abstract An easy to manufacture and service two-stage servo valve of the deflectable free jetstream-type is provided having a split body construction, part of which houses the second-stage or output valve spool which controls the flow of fluid through actuating ports with respect to supply and return ports, and the other part of which supports the jet deflector hydraulic amplifier and torque motor to constitute a separable first-stage assembly. Although there is mechanical force feedback between the valve spool and armature of the torque motor, the servo valve is so constructed that no feedback forces are transmitted through the jetstream deflector. This enables the deflector to be designed as a nonstructural element for ease of manufacture and made of a material having the desired physical characteristics such as one resistant to fluid erosion.
Inventors
- 👤 Martyn V Waddington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:39
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0436; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/218; Y10T137/2202; Y10T137/2213; Y10T137/2278; Y10T137/2322; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86606; Y10T137/86614
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
330 words
In a deflectable free jetstream type two-stage servovalve having a second-stage assembly including a second-stage body having fluid pressure, return and actuating ports, the improvement which comprises a separable first-stage assembly including a first-stage body having a first surface and a recess in said first surface provided by a cylindrical wall, deflector jet hydraulic amplifier means mounted on said first-stage body and torque motor means mounted on said first-stage body and operatively associated with said hydraulic amplifier means, and means securing said bodies together including removable fasteners, said deflector jet hydraulic amplifier means including two end members and an intermediate member superimposed upon one another and arranged in said recess, that one of said members adjacent said first surface having a cylindrical periphery pressfitted on said wall, the intermediate one of said members having an opening extending therethrough covered on one side by said one of said end members and on the other side by the other of said end members, said opening being shaped to provide in conjunction with the covering afforded by said end members a fixed ejector nozzle having a discharge orifice and a pair of fixed receiver passages having entrance ports opposite to and spaced from said orifice, said bodies and said one of said end members having conduits therein for communicatively connecting said nozzle upstream of its said orifice with said pressure port and further having conduits communicatively connected to said receiver passages downstream of their said entrance ports and operatively associated with said actuating ports and still further having conduits communicativEly connecting the space between said orifice and entrance ports with said return port, whereby said nozzle is arranged to discharge a free jetstream of fluid across said space toward said receiver passages, said deflector jet hydraulic amplifier means also including a deflector arranged at least partly in said space to deflect said stream relative to said entrance ports and operatively associated with said torque motor means so as to be movably responsive thereto.
Claim 2
Dependent Claim
330 words
In a deflectable free jetstream type two-stage servovalve having a second-stage assembly including a second-stage body having fluid pressure, return and actuating ports, the improvement which comprises a separable first-stage assembly including a first-stage body having a first surface and a recess in said first surface provided by a cylindrical wall, deflector jet hydraulic amplifier means mounted on said first-stage body and torque motor means mounted on said first-stage body and operatively associated with said hydraulic amplifier means, and means securing said bodies together including removable fasteners, said deflector jet hydraulic amplifier means including two end members and an intermediate member superimposed upon one another and arranged in said recess, that one of said members adjacent said first surface having a cylindrical periphery pressfitted on said wall, the intermediate one of said members having an opening extending therethrough covered on one side by said one of said end members and on the other side by the other of said end members, said opening being shaped to provide in conjunction with the covering afforded by said end members a fixed ejector nozzle having a discharge orifice and a pair of fixed receiver passages having entrance ports opposite to and spaced from said orifice, said bodies and said one of said end members having conduits therein for communicatively connecting said nozzle upstream of its said orifice with said pressure port and further having conduits communicatively connected to said receiver passages downstream of their said entrance ports and operatively associated with said actuating ports and still further having conduits communicativEly connecting the space between said orifice and entrance ports with said return port, whereby said nozzle is arranged to discharge a free jetstream of fluid across said space toward said receiver passages, said deflector jet hydraulic amplifier means also including a deflector arranged at least partly in said space to deflect said stream relative to said entrance ports and operatively associated with said torque motor means so as to be movably responsive thereto.
Claim 3
Dependent Claim
96 words
A servovalve according to claim 1 wherein said second-stage body has a second surface, said first-stage body is arranged relative to said second-stage body such that said first surface is opposite and spaced from said second surface, said first-stage body has an end face at the inner end of said recess, said other of said end members engages said end face, said one of said end members protrudes from said recess beyond said first surface and engages said second surface, and said fasteners when tightened clamp the superimposed members between said end face and second surface.
Claim 4
Dependent Claim
47 words
A servovalve according to claim 2 wherein said first-stage body has another surface which defines with said end face a spring element to maintain the compressive loading on said members even during dimensional changes of said members relative to said first-stage body due to varying thermal conditions.
Claim 5
Dependent Claim
162 words
In a deflectable free jetstream type two-stage servovalve having a first stage assembly including a first-stage body, torque motor means mounted on said first-stage body and including an armature, and hydraulic amplifier means mounted on said first-stage body and including a free jetstream deflector movable with said armature and in response to a signal input to said torque motor means, a second-stage assembly including a second-stage body and an output valve slide arranged in said second-stage body and movable in response to the movement of said deflector, and mechanical force feedback means operatively interposed between said deflector and valve slide including a feedback spring member, the improvement which comprises means providing said deflector as an offset element on a deflector support member movable with said armature and having an opening receiving said stream, said feedback spring member being elongated and having one end cantilever-mounted on said deflector support member and also having its other end constrained to move with said valve slide.
Claim 6
Dependent Claim
162 words
In a deflectable free jetstream type two-stage servovalve having a first stage assembly including a first-stage body, torque motor means mounted on said first-stage body and including an armature, and hydraulic amplifier means mounted on said first-stage body and including a free jetstream deflector movable with said armature and in response to a signal input to said torque motor means, a second-stage assembly including a second-stage body and an output valve slide arranged in said second-stage body and movable in response to the movement of said deflector, and mechanical force feedback means operatively interposed between said deflector and valve slide including a feedback spring member, the improvement which comprises means providing said deflector as an offset element on a deflector support member movable with said armature and having an opening receiving said stream, said feedback spring member being elongated and having one end cantilever-mounted on said deflector support member and also having its other end constrained to move with said valve slide.
Claim 7
Dependent Claim
23 words
A servovalve according to claim 4 wherein said deflector is an element separate from said deflector support member and is rigidly attached thereto.
Claim 8
Dependent Claim
27 words
A servovalve according to claim 5 wherein said deflector is a plate having a slot therein leading to one edge thereof and providing the stream receiving opening.
Claim 9
Dependent Claim
42 words
A servovalve according to claim 4 further comprising a flexure tube member partially surrounding said deflector support member and at one end supporting the same and said armature and at its other end having an attaching flange secured to said first-stage body.
Claim 10
Dependent Claim
34 words
A servovalve according to claim 4 wherein said torque motor means including pole pieces separated by permanent magnets and fasteners securing said pole pieces to said first-stage body and clamping said permanent magnets therebetween.
Claim 11
Dependent Claim
47 words
A servovalve according to claim 7 wherein said torque motor means includes pole pieces separated by permanent magnets, one of said pole pieces being ring-shaped and surrounding said flexure tube member, and fasteners securing said pole pieces to said first-stage body and clamping said permanent magnets therebetween.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |