EP0080466A1 - Dispositif d'actionnement lineaire hydraulique - Google Patents

Dispositif d'actionnement lineaire hydraulique

Info

Publication number
EP0080466A1
EP0080466A1 EP19820901526 EP82901526A EP0080466A1 EP 0080466 A1 EP0080466 A1 EP 0080466A1 EP 19820901526 EP19820901526 EP 19820901526 EP 82901526 A EP82901526 A EP 82901526A EP 0080466 A1 EP0080466 A1 EP 0080466A1
Authority
EP
European Patent Office
Prior art keywords
actuator
piston
hydraulic
rotation
rod
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.)
Withdrawn
Application number
EP19820901526
Other languages
German (de)
English (en)
Inventor
John Richard Archer
David John Targell
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.)
Prutec Ltd
Original Assignee
Prutec 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 Prutec Ltd filed Critical Prutec Ltd
Publication of EP0080466A1 publication Critical patent/EP0080466A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2823—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT by a screw mechanism attached to the piston

Definitions

  • This invention relates to an hydraulic linear actuator.
  • Conventional hydraulic linear actuators when used in closed loop positional servo control systems, require the use of a positional transducer which is incorporated as a separate device in the mechanism being controlled.
  • the positional transducer provides a feedback which is measured to enable adjustment of the actuator, more especially to adjust the stroke of the piston.
  • a positional transducer In general, therefore, a positional transducer, must be specifically matched to the particular stroke of the actuator, which is in turn a function of its specific application. Disadvantageously, therefore, even for similar applications differing combinations of transducer and actuator are required. A further disadvantage arises because positional transducers are generally not robust in comparison with the actuator, and are thereby liable to damage.
  • an hydraulic linear actuator having a linearly driven piston, wherein a mechanism is incorporated within the actuator and coupled to the piston to produce rotation of a member proportional to incorporated within the actuator to sense the rotation of said member.
  • the rotary transducer which may be of a variety of types such as an opti cal sens or , electr ic ( potentio etr ic ) sen s or or electromagnetic ( inductive) sensor, is provided within the actuator.
  • the transducer is inherently matched to the piston stroke, thus f aci litating the use of the identical transducer for differing actuator strokes .
  • the actuator- piston is held against rotation and carr ies a nut formation within which engages a screwthreaded rod which constitutes the said member .
  • a tens ioned rod may pass through the piston to hold it against rotation.
  • a non-circular piston may move in a matching non-circular bore.
  • the rotary transducer may be located at one end of the actuator in an enclosure sealed from the hydraulic chambers of the actuator and into which the rotationally driven rod extends from the ad jacent chamber.
  • Figure 2 is a longitudinal cross-section on the line 2-
  • Figure 3 is a part longi tudinal cross-section on the line 3-3 of Figure 1.
  • the hydraulic linear actuator has 10 a hous ing 10 sealed by end closures 12 and 14. W ithin the hous ing 10 is a piston 16 connected to a pi ston rod 18 which emerges th rough the end c lo su re 12.
  • the pi ston 16 i s linearly displaceable along the housing 10 by the passage of oil to or from hydraulic chambers 20 , 22 on oppos ite s ides 1 5 of the piston 16.
  • Port 24 ( Figure 2) connects to the chamber 20
  • port 26 (F igure 3 ) connects through a pas sage 28 in the wall of the hous ing to the chamber 22.
  • the piston 16 i held against rotation by a tens ioned rod 30 f ixed between the end closures 12 and 14 and passing through said piston.
  • a mechanism is incorporated within the actuator to produce a rotation proportional to piston di splacement, thereby to enable a rotational position sensor also to be incorporated
  • the mechan i sm compr ises a nut assembly 32 located in a bore in the piston rod 18. This
  • 25 bore extends over a part of the length of the piston rod 18 to enable a screwthreaded rod 34, which is in screwthreaded engagement with the nut assembly 32, to extend therefrom out
  • an end cap 38 On the exterior of the end closure 14 an end cap 38 dif ines an enclosure into which extends the end of the rotationally driven rod 34.
  • An 0-ring 40 ( Figure 3 ) seals the rod 34 in the bore in the end closure 14 between the bearings 36, thus isolating the end cap enclosure from the adjacent hydraulic chamber 20.
  • a rotational positional sensor 42 Within the end cap enclosure is located a rotational positional sensor 42, which may be a transducer of any of a variety of convenient types such as those previously mentioned.
  • the transducer 42 is wholly enclosed and thereby protected within the body of the actuator, whi ch includes the end cap 38 rigidly fixed to the end closure 14. If desired, moreover, the rotational position transducer 42 can a lterna t ively be i ncorpor ated w i th in one of the
  • alternative or additional transducers can be employed for measurement of velocity or acceleration.

Abstract

Dispositif d'actionnement lineaire hydraulique possedant un piston entraine de maniere lineaire (16) dans lequel un mecanisme (32) est incorpore dans le dispositif d'actionnement et couple au piston (16) pour produire la rotation d'un organe (34) proportionnelle a la course du piston, un detecteur de position rotative (42) etant incorpore dans le dispositif d'actionnement pour detecter la rotation de l'organe mentionne (34).
EP19820901526 1981-05-28 1982-05-28 Dispositif d'actionnement lineaire hydraulique Withdrawn EP0080466A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8116323 1981-05-28
GB8116323 1981-05-28

Publications (1)

Publication Number Publication Date
EP0080466A1 true EP0080466A1 (fr) 1983-06-08

Family

ID=10522104

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820901526 Withdrawn EP0080466A1 (fr) 1981-05-28 1982-05-28 Dispositif d'actionnement lineaire hydraulique

Country Status (2)

Country Link
EP (1) EP0080466A1 (fr)
WO (1) WO1982004293A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58184302A (ja) * 1982-04-20 1983-10-27 Kowa Shoji Kk 伸縮旋回装置
EP0126796B1 (fr) * 1983-05-30 1987-05-13 Kowa Shoji, Ltd. Dispositif de commande de la position et blocage pour un vérin actionné par un fluide
GB2176354B (en) * 1985-06-07 1988-12-21 Hemscheidt Maschf Hermann Apparatus for the digital determination of the length of a piston stroke
DE3914860A1 (de) * 1989-05-07 1990-11-08 Hartmann Hans Hydraulische antriebsvorrichtung
US5350390A (en) * 1992-03-25 1994-09-27 Arieh Sher Device for removal of intraluminal occlusions
US5467684A (en) * 1992-03-25 1995-11-21 Sher; Arieh Rotary piston driving mechanism
GB9911526D0 (en) * 1999-05-19 1999-07-14 Lucas Ind Plc Actuator
US6499506B2 (en) * 2001-03-27 2002-12-31 Aprion Digital Ltd. Vacuum distribution controller apparatus
GB2405933A (en) * 2003-09-12 2005-03-16 Page Aerospace Ltd Measuring movement of a hydraulic actuator
US9526846B2 (en) 2009-08-19 2016-12-27 Safety Syringes, Inc. Patient-contact activated needle stick safety device
DE102013220298B4 (de) * 2013-10-08 2019-01-17 Danfoss Power Solutions Gmbh & Co. Ohg Vorrichtung zur Erfassung der Servokolbenposition in einer Hydraulikmaschine mittels eines Drehsensors

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1181958B (de) * 1960-10-22 1964-11-19 Garbe Lahmeyer & Co Ag Einrichtung zur Stellungsanzeige von Kolben in Arbeits- und Steuerzylindern
GB1224238A (en) * 1967-09-15 1971-03-03 Bergwerksverband Gmbh Hydraulic jack arrangement in particular for use in mining operations
DE1299432B (de) * 1967-12-30 1969-07-17 Maurer Ludwig Verfahren und Vorrichtung zur Stellwegmessung bei einer mit einem Druckmedium beaufschlagten Kolben-zylinder-Einheit
FR2216467A1 (fr) * 1973-10-09 1974-08-30 Poclain Sa
GB2076469A (en) * 1980-04-29 1981-12-02 Secretary Industry Brit Fluid actuated ram with position measuring device
US4386552A (en) * 1980-06-16 1983-06-07 Foxwell W John Power cylinder with internally mounted position indicator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8204293A1 *

Also Published As

Publication number Publication date
WO1982004293A1 (fr) 1982-12-09

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19830812

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TARGELL, DAVID JOHN

Inventor name: ARCHER, JOHN RICHARD