US3872772A - Electro-hydraulic actuator - Google Patents

Electro-hydraulic actuator Download PDF

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Publication number
US3872772A
US3872772A US398412A US39841273A US3872772A US 3872772 A US3872772 A US 3872772A US 398412 A US398412 A US 398412A US 39841273 A US39841273 A US 39841273A US 3872772 A US3872772 A US 3872772A
Authority
US
United States
Prior art keywords
piston
pressure
flapper
gallery
bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US398412A
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English (en)
Inventor
Ronald Bernard Walters
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vickers Inc
Original Assignee
Sperry Rand Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sperry Rand Ltd filed Critical Sperry Rand Ltd
Application granted granted Critical
Publication of US3872772A publication Critical patent/US3872772A/en
Assigned to VICKERS, INCORPORATED reassignment VICKERS, INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SPERRY LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means

Definitions

  • An electro-hydraulic actuator comprising a piston working within a bore, and provided with a piston rod.
  • a system pressure gallery is arranged for the application of system pressure to an annular area between the piston and the piston rod, andanother gallery is arranged for applying pressure to the other end of the piston.
  • the latter gallery communicates with the pressure system gallery through a fixed orifice and with a tank outlet through a variable orifice controlled by a flapper, the flapper being balanced with respect to hydraulic pressure and being coupled to the armature of a solenoid and through a feed-back spring to the piston.
  • the present invention relates to electro-hydraulic actuators. It is an object of the invention to provide a form of such an actuator which is simple in construction and relatively inexpensive to manufacture.
  • An electro-hydraulic actuator comprises a piston having a piston rod, a system pressure gallery arranged for the application of system pressure to the annular area between the piston and the piston rod, and a gallery for applying pressure to the other end of the. piston, the gallery communicating with the pressure system gallery through a fixed orifice and with a tank outlet through a variable orifice controlled by a flapper, the flapper being balanced with respect to hydraulic pressure and being coupled directly to a solenoid and through a feed-back spring to the piston.
  • the flapper is in the form of a disc bearing on the sharpened edge of an outlet tube and the opposite face of the disc is provided with a pressurebalancing tube of the same outside diameter as the sharpened edge of the outlet tube working in a bore in the piston, the pressure in this bore being equalised to be tank outlet pressure, preferably by a passage through the flapper disc.
  • a counter-balancing spring may be provided so as to balance the force of the feedback spring when the actuator is in the fully retracted condition.
  • the drawing shows an actuator according to the invention in longitudinal section.
  • the actuator comprises a body 1 having a bore 2 for the piston 3.
  • the piston is formed integrally with a piston rod 4, the outer end of which at 5 isprovided with means for coupling it to the apparatus to be actuated.
  • a system pressure inlet 6 communicates with a gallery 7 by means of which system pressure is applied to the .annular area between the piston and piston rod.
  • the piston rod is proportioned so that its cross-section is half that of the piston itself, so the system pressure acts effectively over half the piston area.
  • the pressure inlet 6 also communicates by way of a fixed orifice 8 with a further gallery 9 at the other end of the piston. From this it can escape to tank through a variable orifice formed between the flapper disc 10 and the sharpened edge of an outlet tube 11.
  • the opposite side of the flapper disc 10 carries a counter-balance tube 12 working in a bore 13 in the piston rod and communicating with tank pressure by means of a passageway 14 in the flapper disc.
  • the flapper disc is coupled by a rod 15 to the armature of a solenoid l6, and is also acted on by a spring 17, the other end of which is anchored by a clip 18 to the piston.
  • a balance spring 19 acts on the rod 15 so that under no-load conditions and when the piston is fully retracted inwards the force of the feed-back spring 17 is counter-balanced and the flapper disc 10 rests in equilibrium in a position in which the variable orifice is of substantially the same area as the fixed orifice 8.
  • a cover 20 encloses the solenoid, and the space within this cover 21 in operation is filled with fluid at tank pressure and communicates with tank by means of a tank port (not visible in the section shown in the FIG: URE).
  • the flapper disc 10 is drawn towards the solenoid, tending to close the variable orifice and raise the pressure in the gallery 9.
  • the piston then moves outwards until the force exerted on the flapper by the feed-back spring 17 substantially counter-balances the pull of the solenoid, allowing the flapper to open and a flow of fluid through the variable orifice to take place. until the piston reaches a new position of equilibrium. The displacement of the piston is therefore substantially pro- I portional to the current flowing through the solenoid.
  • An electro-hydraulic actuator comprising a body having a bore, a piston working within said bore, and provided with a piston rod, a system pressure gallery arranged for the application of system pressure to the annular area between the piston and the piston rod.
  • a gallery forapplying pressure to the other end of the piston said last-mentioned pressure applying gallery communicating with said pressure system gallery through afixed orifice, an outlet tube secured to said body adjacent said other end of said piston and having a sharpened edge on an end thereof, a flapper in the form of a disc bearing on said tube edge and forming a variable orifice therewith, a solenoid means in said body controlling said flapper, a feedback spring interposed between said other end of said piston and said flapper, a tank outlet open to said outlet tube,
  • said piston having a closed end bore, the face of said disc opposite to the outlet tube being provided with a pressure balancing tube of the same outside diameter as the sharpened edge of the outlet tube and working in said bore in said piston, said flapper disc having a passage opening on opposite sides thereof to said outlet tube and said pressure balancing tube, respectively, the pressure in said lastmentioned bore being equalized to the tank outlet pressure by means of said passage through said flapper disc.
  • An electro-hydraulic actuator according to claim 2 provided with a counter-balancing spring acting on said flapper disc arranged to balance the force of said feed-back spring when said actuator is in the fully retracted condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Servomotors (AREA)
  • Safety Valves (AREA)
  • Control Of Fluid Pressure (AREA)
US398412A 1972-09-29 1973-09-18 Electro-hydraulic actuator Expired - Lifetime US3872772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4508072A GB1444910A (en) 1972-09-29 1972-09-29 Electro-hydraulic actuator

Publications (1)

Publication Number Publication Date
US3872772A true US3872772A (en) 1975-03-25

Family

ID=10435804

Family Applications (1)

Application Number Title Priority Date Filing Date
US398412A Expired - Lifetime US3872772A (en) 1972-09-29 1973-09-18 Electro-hydraulic actuator

Country Status (9)

Country Link
US (1) US3872772A (US20110158925A1-20110630-C00042.png)
AU (1) AU474484B2 (US20110158925A1-20110630-C00042.png)
CA (1) CA983351A (US20110158925A1-20110630-C00042.png)
CH (1) CH560849A5 (US20110158925A1-20110630-C00042.png)
DE (1) DE2347061C2 (US20110158925A1-20110630-C00042.png)
FR (1) FR2201405B1 (US20110158925A1-20110630-C00042.png)
GB (1) GB1444910A (US20110158925A1-20110630-C00042.png)
IT (1) IT993424B (US20110158925A1-20110630-C00042.png)
SE (1) SE399307B (US20110158925A1-20110630-C00042.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4815356A (en) * 1980-12-05 1989-03-28 Mauser-Werke Oberndorf Gmbh Breech lock mechanism for automatic firearms
US20050005919A1 (en) * 2003-07-08 2005-01-13 Tyler Jeffery A. Control system regulating air flow to engine intake
US20060228236A1 (en) * 2005-03-31 2006-10-12 Krisher James A Actuator assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1465674A (en) * 1973-02-26 1977-02-23 Sperry Rand Ltd Electrically-operated fluid actuator
GB1580946A (en) * 1977-05-27 1980-12-10 Abex Corp Flow control valve
DE4302130C2 (de) * 1993-01-27 1995-04-13 Orenstein & Koppel Ag Elektro-hydraulische Stelleinheit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574335A (en) * 1948-02-21 1951-11-06 Ledue Rene Fluid-pressure motor device for control systems
US3208352A (en) * 1960-05-13 1965-09-28 Lucien Rene Electro-hydraulically controlled positioning device
US3664235A (en) * 1969-09-22 1972-05-23 Serck Industries Ltd Fluid pressure operated servo arrangement
US3683748A (en) * 1969-10-15 1972-08-15 Bosch Gmbh Robert Hydraulic system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092771B (de) * 1955-03-08 1960-11-10 Asea Ab Hydraulischer Servomotor
DE1072101B (US20110158925A1-20110630-C00042.png) * 1958-09-09 1959-12-24
FR1423873A (fr) * 1964-11-24 1966-01-07 Franco Belge Mat Chemin Fer Dispositif hydro-électrique de positionnement linéaire
GB1141915A (en) * 1965-10-22 1969-02-05 Chandler Evans Inc A digital pulse operated positioning apparatus
GB1264121A (US20110158925A1-20110630-C00042.png) * 1968-02-14 1972-02-16

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2574335A (en) * 1948-02-21 1951-11-06 Ledue Rene Fluid-pressure motor device for control systems
US3208352A (en) * 1960-05-13 1965-09-28 Lucien Rene Electro-hydraulically controlled positioning device
US3664235A (en) * 1969-09-22 1972-05-23 Serck Industries Ltd Fluid pressure operated servo arrangement
US3683748A (en) * 1969-10-15 1972-08-15 Bosch Gmbh Robert Hydraulic system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4815356A (en) * 1980-12-05 1989-03-28 Mauser-Werke Oberndorf Gmbh Breech lock mechanism for automatic firearms
US20050005919A1 (en) * 2003-07-08 2005-01-13 Tyler Jeffery A. Control system regulating air flow to engine intake
WO2005005802A3 (en) * 2003-07-08 2005-04-14 Lisk Co G W Control system regulating air flow to engine intake
US6883320B2 (en) * 2003-07-08 2005-04-26 G. W. Lisk Company, Inc. Control system regulating air flow to engine intake
US20060228236A1 (en) * 2005-03-31 2006-10-12 Krisher James A Actuator assembly
US8118571B2 (en) 2005-03-31 2012-02-21 Dana Automotive Systems Group, Llc Actuator assembly

Also Published As

Publication number Publication date
AU6057473A (en) 1975-03-27
SE399307B (sv) 1978-02-06
DE2347061C2 (de) 1984-09-13
FR2201405A1 (US20110158925A1-20110630-C00042.png) 1974-04-26
CA983351A (en) 1976-02-10
FR2201405B1 (US20110158925A1-20110630-C00042.png) 1976-10-01
DE2347061A1 (de) 1974-05-02
AU474484B2 (en) 1976-07-22
IT993424B (it) 1975-09-30
GB1444910A (en) 1976-08-04
CH560849A5 (US20110158925A1-20110630-C00042.png) 1975-04-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VICKERS, INCORPORATED, 1401 CROOKS ROAD, TROY, MI.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SPERRY LIMITED;REEL/FRAME:004548/0147

Effective date: 19860303

Owner name: VICKERS, INCORPORATED, MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPERRY LIMITED;REEL/FRAME:004548/0147

Effective date: 19860303