EP0050656B1 - Kombiniertes hydraulisches sperr- und überdruckventil - Google Patents

Kombiniertes hydraulisches sperr- und überdruckventil Download PDF

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Publication number
EP0050656B1
EP0050656B1 EP19810901259 EP81901259A EP0050656B1 EP 0050656 B1 EP0050656 B1 EP 0050656B1 EP 19810901259 EP19810901259 EP 19810901259 EP 81901259 A EP81901259 A EP 81901259A EP 0050656 B1 EP0050656 B1 EP 0050656B1
Authority
EP
European Patent Office
Prior art keywords
chamber
pressure
piston
relief
bias
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
Application number
EP19810901259
Other languages
English (en)
French (fr)
Other versions
EP0050656A4 (de
EP0050656A1 (de
Inventor
Bernus Gene Turner;
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.)
Boeing Co
Original Assignee
Boeing Co
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 Boeing Co filed Critical Boeing Co
Publication of EP0050656A1 publication Critical patent/EP0050656A1/de
Publication of EP0050656A4 publication Critical patent/EP0050656A4/de
Application granted granted Critical
Publication of EP0050656B1 publication Critical patent/EP0050656B1/de
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
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices

Definitions

  • the present invention relates to an integral blocking and relief valve for blocking the flow of a hydraulic fluid unless the pressure of said fluid exceeds a predetermined value, as described in the preamble of claim 1.
  • Fig. 1 is a cross-sectional view of an aircraft spoiler actuator system incorporating a preferred embodiment of the instant integral blocking and relief valve.
  • the basic system components include a control valve 10, the integral blocking and relief valve 12 and the actuator 14.
  • the control valve 10 is of conventional design being comprised of a spool 20 having a series of three land portions 22-24 provided thereon.
  • the spool 20 and lands 22-24 are slidabley guided within a cylinder 26.
  • a series of cavities 32-34 are associated with each land 22-24.
  • a source of high pressure hydraulic fluid is coupled to the cavity 33 whereas the return, or reservoir system pressure is coupled to cavity 32.
  • Associated with each cavity is an exit port 36-38 with additional exit ports 40-42 being provided from the cavity 26.
  • the control valve 10 responds to the position of the spool 20 within the cylinder 26 to meter hydraulic fluid into, and out of various of its ports.
  • the actuator 14 is of conventional design.
  • a piston 50 is slidably guided within a cylinder 52.
  • Packing material 54 such as an "O" ring, seals the piston 50 against the cylinder walls thereby forming an extend chamber 56 and a retract chamber 58.
  • a rod 60 extending from the piston 50 connects through suitable linkage to an aircraft spoiler (not shown).
  • hydraulic fluid is coupled to the actuator extend chamber 56 directly from the output port 42 of the control valve 10 whereas fluid from the retract chamber 58 passes through the integral blocking and relief valve 12 before reaching the control valve.
  • the blocking and relief provided by valve 12 operates on fluid in the actuator retract chamber 58.
  • the preferred construction of the integral blocking and relief valve 12 includes an input port 70 which couples fluid to a first chamber 72.
  • a first piston P A is slidably guided in the first chamber 72.
  • the piston P A has an area A A exposed to hydraulic fluid coupled through the input port 70.
  • Suitable packing 76 seals the piston P A in its chamber 74.
  • a second piston P B has a first portion 80 which is slidably guided in a pressure relief chamber 83. Suitable packing 84 seals the first portion 80 within the chamber 83.
  • Second portion 82 Integral with the first portion 80 of the second piston P B is a second portion 82.
  • Second portion 82 is slidably guided in, and exposes a total area A SB to a relief bias chamber 86.
  • Suitable packing 88 seals the second portion 82 within the chamber 86.
  • a plunger 90 extends from the second end of the first portion 80.
  • a second input port 92 connects to the pressure relief chamber 82 and, as shown, is coupled to output port 40 of control valve 10.
  • a pressure bias port 100 which connects to the metered system high pressure output port 37 of control valve 10, accesses a pressure bias chamber 102.
  • the pressure bias chamber 102 joins the first chamber 72 with the relief bias chamber 86 such that the second end 75 of the first piston P A can abut the free end of the second portion 82.
  • a relief port 120 which connects to system return pressure via port 36 of control valve 10, connects to the relief bias chamber 86.
  • a poppet valve 130 is slidably guided in a poppet chamber 132.
  • the poppet chamber 132 joins with the pressure relief chamber 83 and the first input port 70 such that hydraulic fluid at the first input port 70 is controllably passed to the pressure relief chamber dependent upon the position of the poppet 130.
  • the poppet 130 has a face portion 134 which exposes an effective area Ap to the pressure relief chamber. Further, the poppet face portion 134 is engagable by the plunger portion 90 of the second piston P B such that the poppet may be driven to a position allowing the flow from the input port 70 to the pressure relief chamber 83.
  • a passageway 136 provided in the poppet 132 allows equalization of hydraulic pressure throughout the poppet chamber 132.
  • a spring pair 140 biases the second piston P B out of engagement with the poppet 130.
  • a second spring pair 142 biases the poppet 130 such that it tends to block fluid flow from the first input port 70 to the pressure relief chamber 83.
  • Fig. 2 illustrates operation of the system shown in Fig. 1 in the cylinder extend mode.
  • the control valve spool 20 slides to the right within cylinder 26.
  • the system pressure P forces hydraulic fluid into the cavity 33, out output port 42 and into the extend chamber 56 of the actuator 14.
  • Fluid in the retract chamber 58 is routed to the first input port 70 where it is coupled both to the exposed area A A of the first piston P A and to the poppet chamber 132.
  • system high pressure is routed through the pressure bias port 100 to the pressure bias chamber 102.
  • the net forces on the second piston P B are sufficient to overcome the forces due to the spring pair 140 such that second piston P, is deflected to the left.
  • the plunger 90 engages the poppet 130 such that it is driven to the left in opposition to its spring pair 142.
  • fluid from the retract chamber 58 is permitted to flow from the first input port 70 to the pressure relief chamber 83. The fluid then flows out port 92 and into port 40 of control valve 10 and, finally, out of cavity 32 to the system return reservoir.
  • Fig. 3 illustrates operation of the system in the cylinder retract mode.
  • a suitable signal from the flight deck moves the spool 20 to the left within cylinder 26 of control valve 10. This allows fluid in the extend chamber 56 to pass into control valve port 42, chamber 34 and through port 36 to chamber 32 and, thus, to system return pressure.
  • the piston 50 moves to a "bottomed” position within its cylinder thereby activating the spoiler (not shown) to its retract position. Fluid pressure in the retract chamber 58 rises to system pressure.
  • the exposed area A A of the first piston P A is greater than the exposed area Ap on the face 134 of the poppet 130.
  • this pressure acting on the differential area A A -A P creates a force urging the first piston P A to the left contacting piston P B and driving the. second piston P B to the left opening the poppet 130 and thereby relieving the trapped pressure into chamber 83 and, via port 92 and control valve 10, to the hydraulic system.
  • a particular feature of the invention is that the stepped area A SB of the second portion 82 of the second piston P B referenced to return is related to the exposed area A A of the first piston P A and to the exposed area Ap of the poppet 130 by the relationship:
  • pressure relief For the condition of an existing system pressure P s , and ignoring the force resulting from the stepped area A SB of the second piston P B , pressure relief would be provided in accordance with the following relationship;
  • an improved integral blocking and relief valve which provides pressure relief at a value independent of system pressure levels.
  • the valve utilizes relatively few parts and, as such, is simple to construct and relatively reliable in use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Safety Valves (AREA)

Claims (2)

1. Integrales Blockierungs- und Entspannungsventil (12) zum Blockieren der Strömung eines hydraulischen Strömungsmittels, sofern nicht der Druck dieses Strömungsmittels einen vorbestimmten Wert übersteigt, umfassend:
einen ersten Eingangskanal (70), der dazu geeignet ist, mit der hydraulischen Strömungsmittelquelle (58), die blockiert und entlastet werden soll, verbunden zu werden;
einen zweiten Eingangskanal (92), der dazu geeinget ist, mit einer systemgesteuerten Hydraulikströmungsleitung (40) verbunden zu werden;
einen Druckvorspannungskanal (100), der dazu geeinget ist, mit einer Quelle (37) von Systemhydraulikdruck (P) verbunden zu werden;
einen Entspannungskanal (120), der dazu geeignet ist, mit dem Systemrückdruck (R) verbunden zu werden;
eine erste Kammer (72), die mit dem ersten Eingangskanal (70) verbunden ist und einen ersten Kolben (PA) verschiebbar führt, der an einem ersten Ende (74) eine Fläche (AA) hat, die in der ersten Kammer (72) freiliegt;
eine Druckvorspannungskammer (102), die mit dem Druckvorspannungskanal (100) verbunden ist, in welcher ein zweites Ende (75) des ersten Kolbens (PA) freiliegt;
eine Druckentspannungskammer (83), die mit dem zweiten Eingangskanal (92) verbunden ist und einen zweiten Kolben (PB) verschiebbar führt, der einen Plungerteil (90) umfaßt, welcher sich von diesem aus erstreckt und an der entgegengesetzten Seite in der Druckvorspannungskammer (102) freiliegt sowie in der Lage ist, mit dem zweiten Ende (75) das ersten Kolbens (PA) in Eingriff zu treten;
eine Ventilkegelkammer (132), die sich an die Druckentspannungskammer (83) anschließt und mit dem ersten Eingangskanal (70) verbunden ist sowie ein Tellerventil (130) beherbergt, von dem eine Fläche (Ap) zu der Druckentspannungskammer (83) freiliegt und das mit dem Plungerteil (90) des zweiten Kolbens (PB) in Eingriff treten kann, so daß der Ventilkegel (130) in eine Position getrieben wird, in der eine Strömung von der Ventilkegelkammer (132) zu der Druckentspannungskammer (83) ermöglicht wird; und
eine Entspannungsvorspannungskammer (86), die mit dem Entspannungskanal (120) verbunden ist und einen zweiten Kolbenteil (82) verschiebbar führt, der integral mit einem ersten Kolbenteil (80) von kleinerem Durchmesser von einem (PB) der Kolben ist und von dem eine ringförmige Fläche (ASB) zu der Entspannungsvorspannungskammer (86) freiliegt,
dadurch gekennzeichnet, daß die Entspannungsvorspannungskammer (86) zwischen der Druckentspannungskammer (83) und der Druckvorspannungskammer (102) angeordnet ist und daß der zweite Kolbenteil (82), der darin freiliegt, ein Teil des zweiten Kolbens (PB) ist.
2. Ventil nach Anspruch 1, dadurch gekennzeichnet, daß die Fläche (AsB) des zweiten Kolbens (PB), die in der Entspannungsvorspannungskammer (86) freliegt, im wesentlichen gleich der Differenz zwischen der Fläche (AA) des ersten Kolbens (PA), die in der ersten Kammer (72) freiliegt, und der Fläche (Ap) der Tellerventils (130), die zu der Druckentspannungskammer (83) freiliegt, ist (ASB≅AA-AP).
EP19810901259 1980-05-01 1981-04-23 Kombiniertes hydraulisches sperr- und überdruckventil Expired EP0050656B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14551180A 1980-05-01 1980-05-01
US145511 1980-05-01

Publications (3)

Publication Number Publication Date
EP0050656A1 EP0050656A1 (de) 1982-05-05
EP0050656A4 EP0050656A4 (de) 1982-09-03
EP0050656B1 true EP0050656B1 (de) 1985-06-26

Family

ID=22513431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810901259 Expired EP0050656B1 (de) 1980-05-01 1981-04-23 Kombiniertes hydraulisches sperr- und überdruckventil

Country Status (2)

Country Link
EP (1) EP0050656B1 (de)
WO (1) WO1981003208A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03229075A (ja) * 1990-01-31 1991-10-11 Teijin Seiki Co Ltd リリーフ機能付きカウンターバランス弁
CN100516554C (zh) * 2006-06-28 2009-07-22 卢永松 内置式定压输出控制压力源模块

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653626A (en) * 1946-09-14 1953-09-29 Vickers Inc Power transmission
US2778378A (en) * 1952-07-28 1957-01-22 Bendix Aviat Corp Combination sequence and locking valve
US3792715A (en) * 1973-03-26 1974-02-19 Koehring Co Single seat holding valve
US3857404A (en) * 1973-04-30 1974-12-31 Caterpillar Tractor Co Hydraulically operated lock valve assembly
US3942550A (en) * 1974-08-02 1976-03-09 The Bendix Corporation Dual-acting relief valve
US3943968A (en) * 1975-01-06 1976-03-16 Parker-Hannifin Corporation Combination lock and relief valve for hydraulic systems
DE2616251C2 (de) * 1976-04-13 1986-05-15 Robert Bosch Gmbh, 7000 Stuttgart Druckbegrenzungs- und Nachsaugventil

Also Published As

Publication number Publication date
EP0050656A4 (de) 1982-09-03
WO1981003208A1 (en) 1981-11-12
EP0050656A1 (de) 1982-05-05

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