EP0140668A2 - Répartiteur - Google Patents

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Publication number
EP0140668A2
EP0140668A2 EP84307258A EP84307258A EP0140668A2 EP 0140668 A2 EP0140668 A2 EP 0140668A2 EP 84307258 A EP84307258 A EP 84307258A EP 84307258 A EP84307258 A EP 84307258A EP 0140668 A2 EP0140668 A2 EP 0140668A2
Authority
EP
European Patent Office
Prior art keywords
stepper motor
valve
shaft
casing
fluid flow
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.)
Granted
Application number
EP84307258A
Other languages
German (de)
English (en)
Other versions
EP0140668B1 (fr
EP0140668A3 (en
Inventor
Arthur Kaye
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.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
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 British Aerospace PLC filed Critical British Aerospace PLC
Publication of EP0140668A2 publication Critical patent/EP0140668A2/fr
Publication of EP0140668A3 publication Critical patent/EP0140668A3/en
Application granted granted Critical
Publication of EP0140668B1 publication Critical patent/EP0140668B1/fr
Expired 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/022—Flow-dividers; Priority valves

Definitions

  • This invention relates to proportioners suitable for use in hydraulic circuits.
  • Proportioners may be used in hydraulic circuits to provide the symmetrical deployment of components controlled by such circuits. For example, in the airbrake-deploying circuit of an aircraft, certain fail-safe conditions must be satisfied ie the symmetrical deployment of the airbraking surfaces, and thus the inclusion of a proportioner may be desirable if not essential. Hitherto, where proportioners have relied only on differential hydraulic pressures or flows, they have proved somewhat imprecise.
  • Yet a further object is to provide a proportioner which is inherently fail-safe.
  • proportioning means for connection to a source of fluid pressure and to separate actuators which require to be synchronously moved, including in combination, casing means having twin fluid flow path means each having an inlet for connection to said source and an outlet for connection one of said actuators, fluid flow throttling means, and pressure-sensitive piston-cylinder means, the proportioning means further including stepper motor means having stator means and shaft means, the stator means being carried by said casing means and the shaft means lying within said casing means to actuate said fluid flow throttling means, whereby stepping of the stepper motor in response to variations in flow to the actuators effects a decrease or increase of flow in order to effect synchronisation of the actuators, and on failure of the stepper motor, any pressure differential within said pressure-sensitive piston-cylinder means causes said shaft means to actuate said flow throttling means to effect synchronisation of the actuators.
  • the stepper motor is reciprocatory and the fluid flow throttling means comprise valve surfaces formed upon spaced ends of the casing means and between which is carried said stator means of the stepper motor, the fluid flow throttling means further comprising opposed valve members carried at the remote ends of the shaft means of the stepper motor, each valve member being operable to mate with its associated valve surface to open and close the valve thereformed, so that when one valve is substantially fully opened, the opposed valve is substantially closed.
  • Each pressure-sensitive piston-cylinder means may be formed by an end portion of the casing means and each piston may be formed by an end portion of the shaft means, the two being sealed by sealing means provided.
  • the casing means, the stepper motor means, the pressure-sensitive piston-cylinder means and the fluid flow throttling means are arranged to be coaxially aligned.
  • the shaft 4 has a portion 4e in its centre which is adapted so that the shaft can be "stepped" to the right or left along its axis X-X by the motor 5.
  • the outlet ports 3a, 3b are located at the ends of the casing coaxially with X-X. Adjacent the ports 3a, 3b, on the interior of the casing 1, are provided conical valve surfaces la, lb respectively.
  • a conical valve member 4a, 4b having a fluid bleed flute 4f, 4g, which can mate with the surfaces la, lb.
  • the relative positions of surfaces la, lb and members 4a, 4b respectively control the flow of fluid through the outlet ports 3a, 3b.
  • Flanges 4c, 4d are formed on the shaft 4 to form two separate hydraulic fluid cylinders 8a, 8b. '0' ring seals 7a, 7b prevent the flow of fluid between the flanges 4c, 4d and the casing 1, but they allow the shaft 4 to move relative to the casing 1 when the stepper motor 5 is operated.
  • the proportioner forms part of a system, as shown in figure 2.
  • a pump 9 pumps hydraulic fluid into the proportioner 10 from a fluid reservoir (not shown).
  • the inlet pressures at the inlet ports 2a, 2b are equal.
  • the fluid flows through the proportioner 10 and is fed to meters 11 and 12 via the outlet ports 3a, 3b.
  • the meters 11, 12 measure the flowrate from each half of the proportioner 10 as the fluid passes through them to airbrake jacks (not shown).
  • Signals representing the measured flowrates are sampled at intervals by a comparator/controller 13 and the signals are compared. If one signal is greater than the other, the comparator/controller 13 then signals the proportioner 10, indicating to the motor 5 which way it should "step" to correct the imbalance present in the system.
  • the comparator/controller 13 would signal the proportioner 10, indicating to it that the motor 5 should "step” the shaft 4 to the right ie bringing the valve surface 1b and valve member 4b closer together and the moving valve surface la and valve member 4a further apart to respectively decrease and increase the flow.
  • the shaft 4 would be "stepped" to the left. The next time the signals from the meters 11, 12 are sampled, the procedure is repeated. This may be carried out several times until the two flowrates are balanced. Sampling may be carried out every 40 ms - the motor 5 can "step" the shaft 4 in increments of 0.635 mm (0.025 in) giving a range of possible outlet flowrates determined by the physical size of the proportioner.
  • the proportioner would then act to balance the pressures in the two hydraulic cylinders 8a, 8b. For example, if the motor 5 failed as the airbrakes were being applied and, say, the left airbrake jack was the more deployed ie there was a greater flowrate through cylinder 8a than through cylinder 8b, then the pressure in the left hydraulic cylinder 8a of the proportioner would be less than the pressure in the right hydraulic cylinder 8b. The greater pressure in cylinder 8b would then cause the shaft 4 to move towards the left, tending to close the off port 3a and open port 3b until the pressures in both cylinder 8a, 8b were balanced, thus producing equal deployment of the airbrakes.
  • the motor 5 fails as the airbrakes are being retracted with, say, the left airbrake retracted to a greater extent than the right airbrake, then the greater pressure in the right airbrake jack due to the action of the surrounding air on the airbrake surface would cause the shaft 4 to move to the left tending to close off port 3a and open port 3b, thus produicng a greater flowrate through the right hydraulic cylinder 8b, until the pressures are balanced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
EP19840307258 1983-11-01 1984-10-22 Répartiteur Expired EP0140668B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838329175A GB8329175D0 (en) 1983-11-01 1983-11-01 Proportioners
GB8329175 1983-11-01

Publications (3)

Publication Number Publication Date
EP0140668A2 true EP0140668A2 (fr) 1985-05-08
EP0140668A3 EP0140668A3 (en) 1985-06-12
EP0140668B1 EP0140668B1 (fr) 1987-09-23

Family

ID=10551062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840307258 Expired EP0140668B1 (fr) 1983-11-01 1984-10-22 Répartiteur

Country Status (4)

Country Link
EP (1) EP0140668B1 (fr)
DE (1) DE3466425D1 (fr)
ES (1) ES8600468A1 (fr)
GB (1) GB8329175D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2201234A (en) * 1987-02-19 1988-08-24 Moog Inc Ejector release unit and fluid flow dividing valve for the unit
US4872310A (en) * 1986-12-12 1989-10-10 British Aerospace, Plc Electro-hydraulic actuator assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466485A (en) * 1944-03-11 1949-04-05 Bendix Aviat Corp Valve
FR2373093A1 (fr) * 1976-12-03 1978-06-30 United Kingdom Government Appareil destine a debiter un melange de gaz sous pression
EP0053883A1 (fr) * 1980-12-08 1982-06-16 General Motors Corporation Actionneur commandé par moteur électrique
EP0117207A1 (fr) * 1983-02-17 1984-08-29 COMPAGNIE PARISIENNE D'OUTILLAGE A AIR COMPRIME Société anonyme dite: Dispositif de distribution hydraulique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466485A (en) * 1944-03-11 1949-04-05 Bendix Aviat Corp Valve
FR2373093A1 (fr) * 1976-12-03 1978-06-30 United Kingdom Government Appareil destine a debiter un melange de gaz sous pression
EP0053883A1 (fr) * 1980-12-08 1982-06-16 General Motors Corporation Actionneur commandé par moteur électrique
EP0117207A1 (fr) * 1983-02-17 1984-08-29 COMPAGNIE PARISIENNE D'OUTILLAGE A AIR COMPRIME Société anonyme dite: Dispositif de distribution hydraulique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872310A (en) * 1986-12-12 1989-10-10 British Aerospace, Plc Electro-hydraulic actuator assembly
GB2201234A (en) * 1987-02-19 1988-08-24 Moog Inc Ejector release unit and fluid flow dividing valve for the unit
GB2201234B (en) * 1987-02-19 1990-03-28 Moog Inc Ejector release unit and fluid flow dividing valve for the unit

Also Published As

Publication number Publication date
DE3466425D1 (de) 1987-10-29
GB8329175D0 (en) 1983-12-07
ES537264A0 (es) 1985-09-16
EP0140668B1 (fr) 1987-09-23
EP0140668A3 (en) 1985-06-12
ES8600468A1 (es) 1985-09-16

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