US3774642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull linear motor
Assignee: Individual
•
Filing: 1972-08-14
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Granted: 1973-11-27
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Expires: 1992-08-14
Abstract
Abstract An electro-hydraulic servo valve means comprising a four-way spool-type valve and a push-pull type linear motor for operating an axially shiftable valve member, said motor comprising a single armature arranged between a pair of spaced, axially aligned, opposing, energized field coils whereby the armature is magnetically biased at all times and subject to instant response to changes in variations in the flux field of said coils created by differentials in signal currents to said fields; said armature having shaped magnetically saturable portions related to each coil whereby magnetic saturation is effected proportionately with respect to linear motion and current differentials; said motor including equal and oppositely disposed spring means at the opposite ends of the armature yieldingly maintaining the armature in a mean position between the coils.
Inventors
- 👤 S Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:21
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0716; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86622
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
309 words
A servo valve having an elongate valving member with front and rear ends and shiftable axially forwardly and rearwardly from a central normal position; drive means to shift the valve member forwardly and rearwardly to and from its central normal position comprising an elongate armature shaft with front and rear ends, coupling means connecting the front end of the shaft with the valving member, an armature with forwardly and rearwardly, axially outwardly disposed surfaces carried by the shaft between the ends thereof, front and rear electro magnet field units arranged forwardly and rearwardly of the armature, respectively, and having axially inwardly disposed north and south poles in normal predetermined spaced and opposing relationship with the front and rear surfaces of the armature related thereto, support means at the ends of the shaft and maintaining the shaft on a common axis and spring loading means at the opposite ends of the shaft biased to exert equal and opposing forces axially inwardly at the ends of the shaft and normally yieldingly holding the shaft with the armature in its normal position, said field units normally energized by quiescent currents and establishing equal and opposite magnetic fields intersecting the armature whereby the armature is normally magnetized and held in its normal position by the fields, said armature and shaft being shifted axially toward one field unit upon an increase of current thereto and a decrease of current to the other field unit, resulting in increase and decrease in the magnetic fields of the units acting on the armature, the armature having progressively magnetically saturable portions related to each surface thereof and to the field unit related thereto whereby the saturable portion of the armature to a field unit towards which it is moved saturates progressively with respect to its linear longitudinal movement and linear differentials in the currents to the field units.
Claim 2
Dependent Claim
309 words
A servo valve having an elongate valving member with front and rear ends and shiftable axially forwardly and rearwardly from a central normal position; drive means to shift the valve member forwardly and rearwardly to and from its central normal position comprising an elongate armature shaft with front and rear ends, coupling means connecting the front end of the shaft with the valving member, an armature with forwardly and rearwardly, axially outwardly disposed surfaces carried by the shaft between the ends thereof, front and rear electro magnet field units arranged forwardly and rearwardly of the armature, respectively, and having axially inwardly disposed north and south poles in normal predetermined spaced and opposing relationship with the front and rear surfaces of the armature related thereto, support means at the ends of the shaft and maintaining the shaft on a common axis and spring loading means at the opposite ends of the shaft biased to exert equal and opposing forces axially inwardly at the ends of the shaft and normally yieldingly holding the shaft with the armature in its normal position, said field units normally energized by quiescent currents and establishing equal and opposite magnetic fields intersecting the armature whereby the armature is normally magnetized and held in its normal position by the fields, said armature and shaft being shifted axially toward one field unit upon an increase of current thereto and a decrease of current to the other field unit, resulting in increase and decrease in the magnetic fields of the units acting on the armature, the armature having progressively magnetically saturable portions related to each surface thereof and to the field unit related thereto whereby the saturable portion of the armature to a field unit towards which it is moved saturates progressively with respect to its linear longitudinal movement and linear differentials in the currents to the field units.
Claim 3
Dependent Claim
129 words
A structure as set forth in claim 1 wherein the field units include elongate axially aligned, axially spaced cylindrical cores with central openings through which the shaft freely projects, flat axially inwardly opposing inner ends, annular, axially inwardly opening grooves opening at said inner ends and defining axially inwardly disposed radially spaced annular pole faces and field coils engaged in the grooves, said armature being a flat, radially extending disc-shaped part on the shaft extending freely between the inner end of the field units and having an outer cylindrical side with a radially outwardly opening shaped channel defining said magnetically saturable portions related to the surfaces at the opposite ends thereof, and means engaged with and between the cores to maintain the units in fixed relationshIp with each other.
Claim 4
Dependent Claim
48 words
A structure as set forth in claim 2 wherein said support means for the shaft includes axially yielding radially non-yielding spring units mounted in fixed spaced position from axially outwardly disposed ends of the field units and means connecting each spring unit with an end of the shaft.
Claim 5
Dependent Claim
54 words
A structure as set forth in claim 3 wherein said spring loading means includes spring seats, bearing support means between the seats and the ends of the shaft, axially force exerting springs with inner and outer ends, said inner ends engaging the spring seats and spring stops engaging the outer ends of said springs.
Claim 6
Dependent Claim
109 words
A structure as set forth in claim 3 wherein said spring loading means includes spring seats, bearing support means between the seats and the ends of the shaft, elongate, axially extending helical compressing springs with inner ends engaging the spring seats and spring stops engaging the other outer ends of the compression springs, the spring stops related to one spring being in fixed position relative to the field units and the other spring stop having a part in fixed position relative to the field units, an axially moveable part and axially shiftable screw means between the parts whereby the moveable part can be moved axially to bias the springs.
Claim 7
Dependent Claim
159 words
A structure as set forth in claim 3 wherein the field units include elongate axially aligned, axially spaced cylindrical cores with central openings through which the shaft freely projects, flat axially inwardly opposing inner ends, annular, axially inwardly opening grooves opeing at said inner ends and defining axially inwardly disposed radially spaced annular pole faces and field coils engaged in the grooves, said armature being flat, radially extending disc-shaped part on the shaft extending freely between the inner ends of the field units and having an outer cylindrical side with a radially outwardly opening shaped channel defining said magnetically saturable portions related to the surfaces at the opposite ends thereof, and means engaged with and between the cores to maintain the units in fixed relationship with each other and including an elongate barrel with open ends and in which the cores are engaged and held, said barrel having a mounting flange projecting therefrom to engage a related support structure.
Claim 8
Dependent Claim
48 words
A structure as set forth in claim 6 wherein said support means for the shaft includes axially yielding radially non-yielding spring units mounted in fixed spaced position from axially outwardly disposed ends of the field units and means connecting each spring unit with an end of the shaft.
Claim 9
Dependent Claim
109 words
A structure as set forth in claim 7 wherein said spring loading means includes spring seats, bearing support means between the seats and the ends of the shaft, elongate, axially extending helical compressing springs with inner ends engaging the spring seats and spring stops engaging the other outer ends of the compression springs, the spring stops related to one spring being in fixed position relative to the field units and the other spring stop having a part in fixed position relative to the field units, an axially moveable part and axially shiftable screw means between the parts whereby the moveable part can be moved axially to bias the spring.
Claim 10
Dependent Claim
169 words
A structure as set forth in claim 7 wherein said spring loading means includes spring seats, bearing support means between the seats and the ends of the shaft, elongate, axially extending helical compressing springs with inner ends engaging the spring seats and spring stops engaging the other outer ends of the compression springs, the spring stops relate to one spring being in fixed position relative to the field units and the other spring stop having a part in fixed position relative to the field units, an axially moveable part and axially shiftable screw means between the parts whereby the moveable part can be moved axially to bias the springs, said coupling means connecting the support springs to the ends of the shaft including threaDed portions on the ends of the shaft and threaded parts carried by the spring and engaged with said threaded portions whereby the longitudinal position of the armature can be adjusted by rotating the armature and shaft to advance the threaded portions in the threaded parts.
Claim 11
Dependent Claim
185 words
A structure as set forth in claim 7 wherein said spring loading means includes spring seats, bearing support means between the seats and the ends of the shaft, elongate, axially extending helical compressing springs with inner ends engaging the spring seats and spring stops engaging the other outer ends of the compression springs, the spring stops related to one spring being in fixed position relative to the field units and the other spring stop having a part in fixed position relative to the field units, an axially moveable part and axially shiftable screw means between the parts whereby the moveable part can be moved axially to bias the springs, said coupling means connecting the support springs to the ends of the shaft including threaded portions on the ends of the shaft and threaded parts carried by the spring and engaged with said threaded portions whereby the longitudinal position of the armature can be adjusted by rotating the armature and shaft to advance the threaded portions in the threaded parts, said barrel having an access opening for engaging the armature to rotate said armature and shaft.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |