EP0024276B1 - Stellmotor - Google Patents

Stellmotor Download PDF

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Publication number
EP0024276B1
EP0024276B1 EP79301648A EP79301648A EP0024276B1 EP 0024276 B1 EP0024276 B1 EP 0024276B1 EP 79301648 A EP79301648 A EP 79301648A EP 79301648 A EP79301648 A EP 79301648A EP 0024276 B1 EP0024276 B1 EP 0024276B1
Authority
EP
European Patent Office
Prior art keywords
piston
piston rod
pivot
pin
disc
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
EP79301648A
Other languages
English (en)
French (fr)
Other versions
EP0024276A1 (de
Inventor
Roger Keith Taylor
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.)
TOURDELOS Ltd
Original Assignee
TOURDELOS 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 TOURDELOS Ltd filed Critical TOURDELOS Ltd
Priority to EP79301648A priority Critical patent/EP0024276B1/de
Priority to DE7979301648T priority patent/DE2967132D1/de
Priority to AT79301648T priority patent/ATE8694T1/de
Publication of EP0024276A1 publication Critical patent/EP0024276A1/de
Application granted granted Critical
Publication of EP0024276B1 publication Critical patent/EP0024276B1/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
    • 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
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • 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
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member

Definitions

  • the present invention relates to an actuator for operation by fluid pressure.
  • U.K. Patent Specification No. 1401963 describes and claims an actuator including a cylinder, a piston and a piston rod movable relative to one another axially of the cylinder and interconnected by a mechanical linkage within the cylinder, the linkage including a rigid member pivoted to the piston rod at a first pivot, a first link pivoted at one end to the member at a second pivot and at its other end to the piston, a second link pivoted at one end to the cylinder and being, at its other end, pivoted to or pivotally engageable with the member at a third pivot, the second link being so arranged that the third pivot is always nearer the piston than the pivotal connection between the second link and the cylinder, and the mechanical linkage being so arranged that the second and third pivots can be: (a) on opposite sides of the axis of the piston or; (b) on the same side of the axis of the piston but with the second pivot nearer to the axis than the third pivot.
  • an actuator comprising a cylinder within which are a piston, a piston rod and a mechanical linkage arranged to transmit axial movement of the piston to the piston rod at a velocity ratio that decreases as the piston nears the end of its travel towards the piston rod, the linkage including a rigid member pivoted to the piston rod at a first pivot, a link pivoted at one end to the rigid member at a second pivot and pivoted at its other end to the piston, a pin supported in the cylinder at an axial position intermediate the piston and the piston rod end of the cylinder and pivoted to or pivotally engageable with the rigid member to define a third pivot, the arrangement being such that when the piston is at the far end of its travel from the piston rod the second and third pivots are both on one side of the longitudinal axis of the piston rod, the rigid third pivot more offset to said one side of said longitudinal axis than the second pivot and as the piston moves towards the piston rod the second pivot moves to the other side of the longitudinal axis of said piston rod, characterised in
  • the pin is releaseably engageable with the disc, the end of the piston rod in which the disc is rotatably mounted moving axially towards or away from the pin as the piston moves and the pin entering into engagement with the disc as the disc approaches the pin.
  • the actuator shown in the drawings employs a toggle mechanism arranged to vary the force amplification throughout the stroke so that near the end of the working stroke when the piston nears the bottom of the cylinder the force amplification is large, whereas during the first part of the working stroke the force amplification is small or even negative.
  • Such an actuator has application to, for example, a punch in which the upper part of the stroke is required only for the purpose of giving clearance to a workpiece to be inserted in and removed from the dies.
  • a piston 1 is slidable in a cylinder 2 having a lower end block 3 slidably supporting a piston rod 7.
  • the upper end 8 of the piston rod is flattened and of less thickness than the rod diameter. It includes a bearing whose pivot axis is slightly offset to one side of the axis of the piston rod and a downwardly directed nose 9 on said one side bounding a slot in a lower portion of said bearing. The presence of the offset enables the actuator to give increased power and provide some compensation for side loads on the bearing.
  • the tip of the nose is bevelled to provide a lead-in 10 and its inner face forms a slideway 11 for guiding a pin 23 through the slot in the bearing.
  • a disc 14 pivots in the bearing and has a recess 15 opening to its ege. Overlying the disc 14 and secured to either side thereof are link plates 16 and 16a also formed with recesses corresponding to part of the slideway 11 and recess 1 5. The ends of the link plates 16 and 16a remote from the recesses are provided with pivot holes.
  • One end of a link member 17 is pivoted to the link plates by means of a pivot pin 18 and the other end thereof is pivoted to the piston 1 by means of a pivot pin 19.
  • the lower end block 3 has a vertical slot terminating in a vertical end wall 20 and bounded by side walls 21 and 22.
  • the piston rod 7 and link plates 16 and 16a can move axially in the slot, planar surfaces 28 on the link plates sliding over the upper portion of end wall 20 when the piston is towards the top of its stroke.
  • Formed in side walls 21 and 22 adjacent end wall 20 at an axial position appropriately spaced from the base of the end block 3 are transversely extending slideways which slidably support the pin 23 mounted at its ends on respective trunnion blocks 24 and 25.
  • Figure 4 shows the trunnion block 24 in its slideway 26, the pin 23 being retained by means of circlip 27.
  • movement of the pin 23 need not be strictly at right angles to the axis of the piston. If the slideway 26 is inclined upwards at an angle to the axis of the piston 1, there is a counteracting movement between the piston and the pin which may be advantageous in some applications.
  • the actuator may be caused to lock at the end of the working stroke either by means of an over- centre action or by mechanical action. When the line between the centre of the pin 23 and the centre of the bearing moves across a plane parallel to the piston axis, the piston rod is, of course, locked by an over-centre action. It has, however, been found with reference to the present actuator that, provided that the angle between said line and said plane is less than approximately 10 degrees, friction will lock the piston rod notwithstanding that an overcentre action does not quite take place.
  • the releaseable pin 23 engages with the bearing more reliably than the apparatus shown in Figure 2 of British Patent Specification No. 1,401,963 and because of the release feature the present apparatus is not limited to a relatively short working stroke as in the apparatus shown in Figure 3 of the said specification. If, however, only a relatively short working stroke is required the slotted construction of the top of the piston rod may be replaced by a continuous eye with appropriate modification to the shape of the link plates.
  • actuator described herein is primarily intended for pneumatic use, it will be appreciated that the invention also has application to hydraulic actuators, particularly those intended for use at comparatively low hydraulic pressures.

Claims (2)

1. Betätigungsorgan mit einem Zylinder (2), darin angeordnetem Kolben (1), Kolbenstange (7) und einem mechanischen Lenkergestänge (16, 16a, 17) zur Übertragung der axialen Bewegung des Kolbens (1) auf die Kolbenstange (7) mit einem Geschwindigkeitsverhältnis, das bei Annäherung des Kolbens (1) gegen Ende seines zur Kolbenstange (7) gerichteten Hubes abnimmt, wobei das Lenkergestänge ein starres Glied (16, 16a) aufweist, das an der Kolbenstange (7) an einem ersten Gelenk (14) angelenkt ist, ein Lenker (17) an einem Ende mit dem starren Glied (16, 16a) an einem zweiten Gelenk (18) und an seinem anderen Ende mit dem Kolben (1) gelenkig verbunden ist, und ein vom Zylinder an einer axialen Stelle zwischen dem Kolben (1) und dem Kolbenstangenende des Zylinders (2) getragener Stift (23) mit dem statten Glied (16, 16a) unter Bildung eines dritten Gelenkes gelenkig verbunden oder gelenkig verbindbar ist, wobei die Anordnung derart ist, daß, wenn der Kolben (1) an seinem von der Kolbenstange (7) fernen Ende seines Hubes ist und die zweiten und dritten Gelenke (18, 23) sich beide auf einer Seite der Längsachse der Kolbenstange (7) befinden und das dritte Gelenk (23) mehr seitlich zu dieser Längsachse versetzt ist als das zweite Gelenk (18) und wenn der Kolben (1) sich in Richtung der Kolbenstange (7) bewegt, das zweite Gelenk (18) sich zur anderen Seite der Längsachse der Kolbenstange (7) bewegt, dadurch gekennzeichnet, daß der Stift (23) quergleitbar längs einer Senkrechten zur Längsachse der Kolbenstange (7) abgestützt ist, das starre Glied (16, 16a) als Arm ausgebildet ist, der sich radial von einer Scheibe (14) erstreckt, welche drehbar an dem ersten Gelenk in einem Lager befestigt ist, das im Ende (8) der Kolbenstange (7) ausgebildet ist, wobei die Scheibe eine exzentrisch gelagerte Öffnung (15) definiert, welche gelenkig mit dem Stift (23) an dem dritten Gelenk in Eingriff bzw. in Eingriff bringbar ist.
2. Betätigungsorgan nach Anspruch 1, dadurch gekennzeichnet, daß der Stift (23) lösbar in Eingriff mit der Scheibe (14) bringbar ist und das Ende (8) der Kolbenstange (7), in dem die Scheibe (14) drehbar befestigt ist, sich axial zum Stift (23) hin oder von diesem weg bewegt, wenn der Kolben (1) sich bewegt und der Stift in Eingriff mit der Scheibe (14) bei deren Annaherung an den Stift (23) kommt.
EP79301648A 1979-08-14 1979-08-14 Stellmotor Expired EP0024276B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP79301648A EP0024276B1 (de) 1979-08-14 1979-08-14 Stellmotor
DE7979301648T DE2967132D1 (en) 1979-08-14 1979-08-14 Actuator
AT79301648T ATE8694T1 (de) 1979-08-14 1979-08-14 Stellmotor.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79301648A EP0024276B1 (de) 1979-08-14 1979-08-14 Stellmotor

Publications (2)

Publication Number Publication Date
EP0024276A1 EP0024276A1 (de) 1981-03-04
EP0024276B1 true EP0024276B1 (de) 1984-07-25

Family

ID=8186418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79301648A Expired EP0024276B1 (de) 1979-08-14 1979-08-14 Stellmotor

Country Status (3)

Country Link
EP (1) EP0024276B1 (de)
AT (1) ATE8694T1 (de)
DE (1) DE2967132D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932128A (en) * 1988-12-23 1990-06-12 Utica Enterprises, Inc. Mechanical force enhancer
DE4209493C1 (de) * 1992-03-24 1993-05-19 Franz Dipl.-Ing. 7900 Ulm De Kirsching
JPH11115436A (ja) * 1997-10-15 1999-04-27 Toyota Autom Loom Works Ltd 車軸揺動制御用流体圧シリンダの支持構造
CN106164553B (zh) * 2014-03-12 2018-07-27 游金恩国 多重流线偶合

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1401963A (en) * 1971-07-05 1975-08-06 Tourdelos Ltd Actuators
US3745842A (en) * 1971-11-02 1973-07-17 J Brems Force transferring and multiplying system

Also Published As

Publication number Publication date
ATE8694T1 (de) 1984-08-15
EP0024276A1 (de) 1981-03-04
DE2967132D1 (en) 1984-08-30

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