US3750532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servoactuator with mechanical feedback
Assignee: PepsiAmericas Inc
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Filing: 1971-07-22
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Granted: 1973-08-07
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Expires: 1991-07-22
Abstract
Abstract The displacement of a servoactuator such as a variable volume pump or motor is controlled by a servovalve of the jet discharge type having a movable jet tube which is responsive to an electrical input to establish a pressure differential between a pair of fluid lines in accordance with the magnitude of an electrical signal. The pressure differential is applied to operate the opposed hydraulic motors which position the displacement changing means of the pump or motor. A resilient feedback spring is connected mechanically from the displacement changing means to the wet side of the jet tube, and as the displacement changing means is moved by the hydraulic motors, the spring increasingly urges the jet tube toward its null position.
Inventors
- 👤 C Kubilos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:37
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/16; F15B9/00; F15B9/02; F15B9/06; F15B9/07
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
284 words
A variable displacement hydraulic pressure energy translating device having movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, means supporting said displacement changing means, and a case surrounding and enclosing said displacement changing means, said motor means, and said supporting means, a jet discharge electrohydraulic servovalve, said servovalve having a wet chamber and a dry chamber, said servovalve including a pair of adjacent receptor ports located in the wet chamber, an armature operated by a torque motor, said torque motor being located in said dry chamber on one side of said armature, a jet tube having a nozzle at one end thereof located In said wet chamber, said jet tube being fixedly mounted at a point spaced from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, said wet chamber of said servovalve being open to the interior of said case, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports, feedback spring means separate from said armature and tube mechanically connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a null position between said receptor ports as said displacement changing means is moved away from the no displacement position thereof, said spring means being connected to said tube on the other side of said armature which is remote from said torque motor, said spring means being wholly located within said wet chamber and the interior of said case.
Claim 2
Dependent Claim
284 words
A variable displacement hydraulic pressure energy translating device having movable displacement changing means and including fluid motor means for moving and positioning said displacement changing means, means supporting said displacement changing means, and a case surrounding and enclosing said displacement changing means, said motor means, and said supporting means, a jet discharge electrohydraulic servovalve, said servovalve having a wet chamber and a dry chamber, said servovalve including a pair of adjacent receptor ports located in the wet chamber, an armature operated by a torque motor, said torque motor being located in said dry chamber on one side of said armature, a jet tube having a nozzle at one end thereof located In said wet chamber, said jet tube being fixedly mounted at a point spaced from said one end, said tube being displaceable by said armature about said point for adjustably dividing a jet stream from said nozzle between said receptor ports, said wet chamber of said servovalve being open to the interior of said case, means for supplying pressure fluid to said jet tube, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to said fluid motor means from said receptor ports, feedback spring means separate from said armature and tube mechanically connected to said displacement changing means and to said jet tube for increasingly urging said tube toward a null position between said receptor ports as said displacement changing means is moved away from the no displacement position thereof, said spring means being connected to said tube on the other side of said armature which is remote from said torque motor, said spring means being wholly located within said wet chamber and the interior of said case.
Claim 3
Dependent Claim
30 words
The structure of claim 1 wherein said displacement changing means is rotatable about said supporting means and said spring means is connected between said supporting means and said jet tube.
Claim 4
Dependent Claim
50 words
The structure of claim 1 which further includes valve means operated by hydraulic pressure acting on a control surface thereof to permit pressure from said servovalve to be applied to operate said motor means, and said valve means being opposingly spring biased toward a position releasing pressure in said passageways.
Claim 5
Dependent Claim
36 words
The structure of claim 3 wherein the said hydraulic pressure is applied to said control surface of said valve means through an electrically operated cut-off valve which discharges said hydraulic pressure in response to electrical failure.
Claim 6
Dependent Claim
22 words
The structure of claim 1 wherein the fluid motor means includes opposed pistons having equal areas exposed to pressure from said passageways.
Claim 7
Dependent Claim
259 words
A variable displacement fluid pressure energy translating device having means supporting a rotatable displacement changing means, a case surrounding and enclosing said displacement changing means and said supporting means, a jet discharge operated valve having a wet chamber and a dry chamber, said valve including a pair of receptor ports located in said wet chamber, a jet tube having an outlet nozzle located in said wet chamber and adjustably displaceable from a null position for dividing the jet discharge stream therefrom between said receptor ports, said wet chamber of said valve being open to the interior of said case, means for supplying pressure fluid into said jet tube, fluid motor means located within said case and operable to rotate said displacement changing means in response to pressure applied thereto, spring centering means biasing said displacement changing means toward a centered position, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to the fluid motor means from said receptor ports, and a resilient spring means connected between said displacement changing means and a point in said jet tube for urging said tube toward said null position as said displacement changing means is moved by said fluid motor means in response to unequal division of said jet discharge stream between said receptor ports, the point of connection of said resilient spring means to said jet tube being located in the wet chamber at the nozzle end of said jet tube, said spring means being wholly located within said wet chamber and the interior of said case.
Claim 8
Dependent Claim
259 words
A variable displacement fluid pressure energy translating device having means supporting a rotatable displacement changing means, a case surrounding and enclosing said displacement changing means and said supporting means, a jet discharge operated valve having a wet chamber and a dry chamber, said valve including a pair of receptor ports located in said wet chamber, a jet tube having an outlet nozzle located in said wet chamber and adjustably displaceable from a null position for dividing the jet discharge stream therefrom between said receptor ports, said wet chamber of said valve being open to the interior of said case, means for supplying pressure fluid into said jet tube, fluid motor means located within said case and operable to rotate said displacement changing means in response to pressure applied thereto, spring centering means biasing said displacement changing means toward a centered position, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to the fluid motor means from said receptor ports, and a resilient spring means connected between said displacement changing means and a point in said jet tube for urging said tube toward said null position as said displacement changing means is moved by said fluid motor means in response to unequal division of said jet discharge stream between said receptor ports, the point of connection of said resilient spring means to said jet tube being located in the wet chamber at the nozzle end of said jet tube, said spring means being wholly located within said wet chamber and the interior of said case.
Claim 9
Dependent Claim
28 words
The variable displacement fluid energy displacement device of claim 6 wherein said resilient spring means is actuated and controlled by a cam surface secured to said supporting means.
Claim 10
Dependent Claim
30 words
The variable displacement fluid energy displacement device of claim 7 wherein said resilient spring means is actuated by a cam secured to the radial end surface of said supporting means.
Claim 11
Dependent Claim
30 words
The variable diSplacement fluid energy displacement device of claim 7 wherein said resilient spring means is actuated by a cam secured to the peripheral end surface of said supporting means.
Claim 12
Dependent Claim
40 words
The structure of claim 8 wherein said spring means is secured to the supporting means through a ball secured to one end of the spring means and movable within a cam slot in the end face of said supporting means.
Claim 13
Dependent Claim
34 words
The structure of claim 7 wherein said tube is fixed at one end and is angularly displaceable about said one end by a torque motor armature for dividing said stream between said receptor ports.
Claim 14
Dependent Claim
270 words
A rotatable variable displacement device having a rotatable trunnion secured thereto, said device being rotatable about the axis of said trunnion secured thereto, said trunnion being surrounded and enclosed by a case, a jet discharge operated valve having a wet chamber and a dry chamber, said valve including a pair of receptor ports located in said wet chamber, a jet tube having an outlet nozzle located in said wet chamber and adjustably displaceable from a null position for dividing the jet discharge stream therefrom between said receptor ports, said wet chamber of said valve being open to the interior of said case, means for supplying pressure fluid into said jet tube, fluid motor means operable to rotate said device and the attached trunnion in response to pressure applied thereto, resilient centering means biasing said device toward a centered position, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to the fluid motor means from said receptor ports, and a resilient spring connected between the trunnion of said device and a point on said jet tube for urging said tube toward said null position as said device is moved by said fluid motor means in response to unequal division of said jet discharge stream between said receptor ports, the point of connection of said spring to said jet tube being located at the nozzle end of said jet tube, and said spring being actuated and controlled by a cam surface secured to and rotatable with said trunnion, said spring and said cam surface being wholly located within said wet chamber and the interior of said case.
Claim 15
Dependent Claim
270 words
A rotatable variable displacement device having a rotatable trunnion secured thereto, said device being rotatable about the axis of said trunnion secured thereto, said trunnion being surrounded and enclosed by a case, a jet discharge operated valve having a wet chamber and a dry chamber, said valve including a pair of receptor ports located in said wet chamber, a jet tube having an outlet nozzle located in said wet chamber and adjustably displaceable from a null position for dividing the jet discharge stream therefrom between said receptor ports, said wet chamber of said valve being open to the interior of said case, means for supplying pressure fluid into said jet tube, fluid motor means operable to rotate said device and the attached trunnion in response to pressure applied thereto, resilient centering means biasing said device toward a centered position, passageways connecting said receptor ports with the fluid motor means for supplying pressure fluid to the fluid motor means from said receptor ports, and a resilient spring connected between the trunnion of said device and a point on said jet tube for urging said tube toward said null position as said device is moved by said fluid motor means in response to unequal division of said jet discharge stream between said receptor ports, the point of connection of said spring to said jet tube being located at the nozzle end of said jet tube, and said spring being actuated and controlled by a cam surface secured to and rotatable with said trunnion, said spring and said cam surface being wholly located within said wet chamber and the interior of said case.
Claim 16
Dependent Claim
25 words
The variable displacement device of claim 12 wherein said resilient spring is actuated by a cam secured to the radial end surface of said trunnion.
Claim 17
Dependent Claim
25 words
The variable displacement device of claim 12 wherein said resilient spring is actuated by a cam secured to the peripheral end surface of said trunnion.
Claim 18
Dependent Claim
34 words
The structure of claim 12 wherein said tube is fixed adjacent one end and is angularly displaceable about said one end by a torque motor armature for dividing said stream between said receptor ports.
Claim 19
Dependent Claim
34 words
The variable displacement device of claim 12 wherein said cam effects movement of a pivoted lever arm, said lever arm having a fixed pivot and being connected to one end of said resilient spring.
Claim 20
Dependent Claim
20 words
The variable displacement device of claim 16 wherein said cam is fixed to a radial end surface of said trunnion.
Claim 21
Dependent Claim
35 words
The structure of claim 13 wherein said spring is secured to the shaft through a ball on the end of the spring movable within a cam slot in the radial end surface of said trunnion.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |