EP0252110A1 - Conversion d'un mouvement lineaire en un mouvement rotatif - Google Patents

Conversion d'un mouvement lineaire en un mouvement rotatif

Info

Publication number
EP0252110A1
EP0252110A1 EP19870900242 EP87900242A EP0252110A1 EP 0252110 A1 EP0252110 A1 EP 0252110A1 EP 19870900242 EP19870900242 EP 19870900242 EP 87900242 A EP87900242 A EP 87900242A EP 0252110 A1 EP0252110 A1 EP 0252110A1
Authority
EP
European Patent Office
Prior art keywords
actuator
rotatable member
piston
valve means
fluid
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Withdrawn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
EP19870900242
Other languages
German (de)
English (en)
Inventor
Peter David Gill
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.)
JC Bamford Excavators Ltd
Original Assignee
JC Bamford Excavators 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 JC Bamford Excavators Ltd filed Critical JC Bamford Excavators Ltd
Publication of EP0252110A1 publication Critical patent/EP0252110A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
    • E02F3/382—Connections to the frame; Supports for booms or arms
    • E02F3/384—Connections to the frame; Supports for booms or arms the boom being pivotable relative to the frame about a vertical axis

Definitions

  • This invention relates to a system for converting linear movement to a rotational movement.
  • the invention relates to such a system for causing rotation of an excavating arm of an excavating vehicle relative to a frame using a pair of linear actuators.
  • Such systems conventionally comprise a pair of hydraulic actuators which are operated such that one actuator pulls a rotational member whilst the other actuator pushes the rotational member about a rotational axis ' .
  • each actuator comprising a piston movable outwardly of a cylinder as fluid is introduced into the cylinder on a first side of the piston, and movable inwardly of the cylinder as fluid is introduced into the cylinder on a second opposite side of the piston
  • the system including valve means to direct fluid to the first side of the piston of the first actuator and to the second side of the piston of the second actuator to move the rotatable member in one direction of rotation about the axis to a first limit position, and to direct fluid to the first side of the piston of the second actuator and to the second side of the piston of the first actuator to move the rotatable member in a second opposite direction of rotation about the axis to a second limit position, means to sense when the rotatable member has been rotated in either direction to the first or
  • the actuator does not operate in opposition to the other actuator but rather the actuators will work together so that continued rotation of the rotatable member towards its first or second extreme position is not opposed. It has been found that in a system in accordance with the invention, the torque which can be achieved at the first and second extreme positions is considerably improved compared with conventional arrangements, and even greater torques can be achieved than the maximum torque which can be achieved in rotating the rotatable member between its first and second limit positions.
  • over centre condition we mean a position beyond that in which the direction of operation of the actuator and the axis of rotation of the rotatable member lie in a common plane.
  • the means which sense when the rotatable member has been rotated in either direction to the first or second limit positions may comprise one or more cams carried by the rotatable member, which cam or cams may each be engaged by a cam follower of a secondary valve means so that when the rotatable member moves to and beyond the limit position, the secondary valve means is operated, which secondary valve means may then cause the flow of fluid to be directed to the opposite side of the piston of the respective actuator.
  • the sensing means comprises a cam carried by each of the actuators, which cams may have cam followers engaged therewith to operate a secondary valve means when the rotatable member moves to and beyond the limit position.
  • the secondary valve means may be operated directly from the cam follower or through a linkage, or the cam follower may operate electrical switches which may cause solenoids for example, or other electrical means, to operate the secondary valve means.
  • the secondary valve means may comprise a separate valve associated with each actuator, or the secondary valve means may comprise a combined valve associated with both of the actuators.
  • the invention is particularly applicable to a system for rotating an excavating arm of an excavating vehicle, relative to a frame thereof. Accordingly it is another object of the invention to provide a new or improved excavating vehicle.
  • an excavating vehicle comprising a body, ground engaging propulsion means to enable the vehicle to move, a frame on the body and carrying a rotatable member of an excavating arm, the excavating arm being mounted for rotational movement about a generally vertical axis, and carrying an excavating implement, and the arm being articulated along its length, the rotatable member of the arm being rotated by a system in accordance with the first aspect of the invention.
  • FIGURE I is a side diagrammatic view of an excavating vehicle embodying the invention.
  • FIGURE 2 is an enlarged perspective view of part of the vehicle of Figure I .
  • FIGURE 3 is a diagrammatic illustration of a system in accordance with the invention.
  • FIGURES 4a and 4b are plan diagrammatic views of parts of the system not shown in Figure 3, and FIGURE 5 is a view similar to the combined views of Figures 4a and 4b which shows an alternative embodiment.
  • an excavating vehicle 10 comprises a body 1 1 having a ground engaging propulsion means including four wheels 12, a housing 13 for an engine ⁇ and an operator's cab 14.
  • a loading arm 15 which carries at the outer end thereof, a loading implement 16 such as a bucket.
  • an excavating arm 18 is mounted, the arm comprising a base part 1 9 to which is articulated a dipper arm 20 for movement about a generally horizontal axis 24.
  • an excavating implement 21 is provided which again comprises a bucket.
  • the dipper arm 20 is movable relative to the base 19 by means of a hydraulic actuator 22, and the excavating implement 21 is movable relative to the dipper arm 20 due to a further hydraulic actuator 23.
  • the excavating arm 18 is carried on a frame 25 which is movable laterally of the vehicle 10, and is mounted via a rotatable member comprising a post 26 which is rotatable relative to the frame 25 by means of a pair of hydraulic actuators 30 and 31 which are best seen in Figure 2.
  • a first actuator 30 of the pair and a second actuator 31 of the pair are each connected via hydraulic lines 27/41 , 34/45, or 27'/42, 34/45, to a valve means 32 which receives fluid under pressure from a pump 33.
  • a valve means 32 which receives fluid under pressure from a pump 33.
  • an operating member of the valve means 32 When an operating member of the valve means 32 is in the (diagrammatic) position shown, i.e. a neutral position, fluid is not directed to either of the actuators 30 and 31. However, if the operating member of the valve means 32 is moved to the right as seen in the drawings, fluid may pass through the valve 32 to hydraulic line 34. Fluid will pass from hydraulic line 34 through secondary valve means 35,35' which wi ll be described hereinafter, to the actuators 30,31.
  • the actuators 30 and 3 1 each comprise a piston 36,36' respectively, movable within a cylinder 37,37', the pistons 36,36' being connected to an operating element 38,38' which is pivotally secured to a crank part 39 which is rigidly secured to the post 26, via connections 50.
  • Fluid which passes from line 34 through the secondary valve means 35 via line 41 is fed to the cylinder 37 of actuator 30 on a first annulus side 40 of the piston 36 and will thus cause the piston 36 to move from right to left as seen in figure 3 of the drawings so that the operating element 38 will be withdrawn into the cylinder 37.
  • fluid which passes from line 34 through secondary valve means 35' passes via a hydraulic line 42 to the cylinder 37' of the second actuator 31 on a second, non annulus side 43 of the piston 36' so as to cause the piston 36' to move from right to left as seen in figure 3 of the drawings, so that the operating element 38' is extended from the cylinder 37'.
  • hydraulic fluid will be passed to hydraulic line 45 and will pass through each of secondary valve means 35,35' so as to feed fluid under pressure via line 41 to the cylinder 37 of actuator 30 on a second non-annuius side 46 of the piston 36, and simultaneously, will feed fluid to the cylinder 37' associated with the second actuator 31 on the first annulus, side 47 of the piston 36' so as to cause the operating element 38' to be withdrawn into the cylinder 37'.
  • This will result in anti-clockwise movement of the post 26 relative to the frame 25 as seen in Figure 2 because the post receives a bearing pin around which the post 26 may rotate.
  • connection 50,51 between the actuators 30 and 1 and the post 26 are shown.
  • the post 26 is illustrated diagramatically, a typical cross section of the part of the post to which the connections 50, 51 are made being seen in figure 5. It will be appreciated that between limits of travel, the connections 50 and 51 will each be on opposite sides of a generally vertical axis 52 of rotation of the post 26. A typical position is shown in dotted lines in Figure 4b. However, as the post 26 swings anti-clockwise for example, eventually the post will reach a limit position when the actuator 30 will be in an over centre condition which is shown in full lines, in which the direction of operation of the actuator 30 wil l lie in the same plane as the axis of rotation 52.
  • valve 35' wi ll be operated (to the left as seen in figure 3) so that fluid will then be fed from hydraulic line 34 not to first non annulus side 43 of the piston 36', but rather to the second, annulus side 47 of the piston 36', again so that the actuators 30 and 31 will work together and not in opposition limiting the torque developed beyond the over centre condition.
  • the valves 35,35' are biased by springs S,S' io the positions shown in figure 3 and are moved against the springs S,S' to change the side of the pistons 36,36' to which fluid is directed.
  • the secondary valve means 35 and 35' are one embodiment, operated by cams 54 and 55 which are shown in Figure 4a.
  • the cam 54 acts directly on an operating part 56 of valve 35, when the post 26 moves beyond the limit position at which the actuator 30 reaches its over centre condition
  • the cam 55 acts directly on an operating part 57 of the valve 35' when the post 26 is rotated in a clockwise sense beyond a limit position in which the actuator 31 reaches an over centre condition.
  • a suitable linkage could be provided between them. It will be appreciated that in this embodiment, the operating parts 56 and 57 act as cam followers.
  • cams 54,55 being carried by the rotatable member i.e. post 26
  • cams 60 and 61 are carried on the hydraulic actuators 30 and 3 1 respectively.
  • the operating parts 56 and 57 of valves 35,35' bear again, directly, on the cams 60 and 61 so that when the post 26 has rotated beyond a l imit position in which for example actuator 30 reaches an over centre condition, the valve 35 will be actuated to ensure that fluid is directed to the opposite side of the piston 36 to that which the fluid has been directed during rotation of the post 26 to its limit position.
  • valves 35,35' which act as cam followers
  • suitable linkages could be provided between the valves 35,35' and the cams 60,61.
  • the cams may operate solenoid or other electrically operated switches which in turn, operate the valves 35 and 35'.
  • the valves could be contained within a ' single valve block, or any other secondary valve means could be provided to feed fluid to an opposite side of an actuator piston as the rotatable member 26 moves beyond its limit position(s).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Actuator (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

Un système permettant de convertir un mouvement linéaire en un mouvement rotatif pour par exemple provoquer la rotation d'un bras excavateur (18) d'un véhicule excavateur (10) par rapport à un châssis (25) autour d'un axe (52) transversal au sens du mouvement linéaire de chacun des actuateurs d'une paire d'actuateurs à double effet (30, 31), comprend des soupapes (35, 35') destinées à inverser l'écoulement du fluide vers l'un des actuateurs lorsque l'actuateur se trouve dans une position surcentrée.
EP19870900242 1986-01-08 1986-12-30 Conversion d'un mouvement lineaire en un mouvement rotatif Withdrawn EP0252110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB08600391A GB2185082A (en) 1986-01-08 1986-01-08 Converting linear movement to rotational movement
GB8600391 1986-01-08

Publications (1)

Publication Number Publication Date
EP0252110A1 true EP0252110A1 (fr) 1988-01-13

Family

ID=10591069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870900242 Withdrawn EP0252110A1 (fr) 1986-01-08 1986-12-30 Conversion d'un mouvement lineaire en un mouvement rotatif

Country Status (4)

Country Link
EP (1) EP0252110A1 (fr)
AU (1) AU6777887A (fr)
GB (1) GB2185082A (fr)
WO (1) WO1987004202A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4139379A1 (de) * 1991-11-29 1993-06-24 Dfa Fertigungs Und Anlagenbau Arbeitsmaschine fuer abbruch-, lade- und grabearbeiten
AUPM487394A0 (en) * 1994-04-07 1994-04-28 Devenish, Donald Mathieson Pneumatic target actuator
GB2452730A (en) * 2007-09-12 2009-03-18 Bamford Excavators Ltd Method of providing a machine readable marking

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528985A (en) * 1947-01-22 1950-11-07 Wunsch Harry Hydraulically actuated swing boom crane
US3872985A (en) * 1970-02-24 1975-03-25 J C Case Company Hydraulic control valve circuit
GB1301236A (fr) * 1970-07-18 1972-12-29
US3757642A (en) * 1971-11-24 1973-09-11 Charles Machine Works Swing mechanism for pivoted member
US4007845A (en) * 1975-03-17 1977-02-15 Massey-Ferguson Inc. Swing mechanism
US4201509A (en) * 1978-10-04 1980-05-06 Ford Motor Company Backhoe swing cylinder hydraulic circuit
US4419040A (en) * 1981-12-10 1983-12-06 J. I. Case Company Backhoe swing mechanism
DE3408421A1 (de) * 1984-03-08 1985-09-12 Krupp Mak Maschinenbau Gmbh, 2300 Kiel Einrichtung zur endlagendaempfung
DE3508691C1 (de) * 1985-03-12 1986-07-10 Eisenwerke Kaiserslautern Göppner GmbH, 6750 Kaiserslautern Hydraulisches Erdbaufahrzeug mit einem schwenkbaren Ausleger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8704202A1 *

Also Published As

Publication number Publication date
WO1987004202A1 (fr) 1987-07-16
GB8600391D0 (en) 1986-02-12
GB2185082A (en) 1987-07-08
AU6777887A (en) 1987-07-28

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Inventor name: GILL, PETER, DAVID