EP0769625A2 - Moteur rotatif à fluide - Google Patents

Moteur rotatif à fluide Download PDF

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Publication number
EP0769625A2
EP0769625A2 EP96115678A EP96115678A EP0769625A2 EP 0769625 A2 EP0769625 A2 EP 0769625A2 EP 96115678 A EP96115678 A EP 96115678A EP 96115678 A EP96115678 A EP 96115678A EP 0769625 A2 EP0769625 A2 EP 0769625A2
Authority
EP
European Patent Office
Prior art keywords
actuator according
actuator
piston
sliding block
sliding blocks
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Withdrawn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
EP96115678A
Other languages
German (de)
English (en)
Other versions
EP0769625A3 (fr
Inventor
Lodovico Armando
Massimo Armando
Valerio Armando
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.)
Nord Engineering Di Armando Lodovico and C SNC
Original Assignee
Nord Engineering Di Armando Lodovico and C SNC
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 Nord Engineering Di Armando Lodovico and C SNC filed Critical Nord Engineering Di Armando Lodovico and C SNC
Publication of EP0769625A2 publication Critical patent/EP0769625A2/fr
Publication of EP0769625A3 publication Critical patent/EP0769625A3/fr
Withdrawn legal-status Critical Current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
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type

Definitions

  • the present invention relates to a rotary fluid actuator comprising a body defining a cylindrical chamber in which a piston can slide axially, a surface of the piston having at least one helical groove for cooperating with guide means which include a sliding block of complementary shape for each groove, each sliding block being supported by the body of the actuator.
  • the sliding blocks are in the form of blocks, each block being complementary with a portion of the respective helical groove and having a central hole, normally a through-hole, for the engagement of an articulation pin fixed radially relative to the body of the actuator.
  • the material constituting each sliding block has to have good resistance to mechanical stresses since the structure of the sliding block is weakened in the narrow sections adjacent the hole and because the forces produced by the actuator in operation, which are sometimes very intense, are concentrated in these regions.
  • a practically essential solution is therefore to use high-strength steel for the construction of the sliding blocks.
  • this involves the risk of the sliding blocks seizing in the respective helical grooves in the event of malfunction due, for example, to a lubrication fault, with consequent serious damage to the helical grooves and hence to the entire main piston of the actuator, since the main piston is also normally made of steel.
  • the main object of the present invention is to propose an actuator of the type indicated above which is free of the aforementioned problems.
  • each sliding block is fixed to the body of the actuator.
  • the sliding blocks using weaker materials, that is, materials having less mechanical strength than those used previously and, in particular, with less mechanical strength than the material used for the construction of the piston so that, in the event of seizure, only the sliding blocks are damaged and not the main piston.
  • each sliding block is mounted on the body removably so that it can be replaced quickly in the event of damage.
  • the sliding blocks are preferably made of an anti-friction material.
  • a double-acting, rotary fluid actuator normally a hydraulic actuator, according to the invention, also known as a helical actuator
  • the actuator 1 can be used in machines of various kinds when it is necessary to convert the power generated by the pressure of a fluid into a mechanical power which enables one or more members to be rotated about an axis, for example, through a predetermined angle of between 0° and 360°.
  • the actuator 1 is advantageously used in devices associated with vehicles for lifting and tipping refuse bins, for example, of the type described in the Applicant's Italian patent application No. T095A000462.
  • the actuator 1 comprises a cylindrical body 3 including a tubular outer wall 5 and a tubular inner wall 7 sealingly mounted for rotation relative to the wall 5.
  • An annular piston 13 is slidable axially and sealingly in a cylindrical chamber 9 defined between the walls 5 and 7. Ducts 9a and 9b, for the admission and discharge of the fluid used to bring about the movement of the piston 13, open in the opposite ends of the chamber 9.
  • the piston 13 which is normally made of steel, has a plurality of helical grooves 15, for example three grooves, on its radially outer surface, which grooves have the same pitch and are thus spaced equiangularly, and each of which is engaged by a respective sliding guide block 18 fixed to the body 3 and having a shape complementary to a portion of the respective groove 15.
  • each sliding block 18 is made in one piece, that is, integrally with an arcuate base portion 19 having the function of a support element for the active portion of the sliding block 18, that is, the portion which is intended to engage the respective groove 15.
  • Both the groove 15 and the active portion of the sliding block 18 preferably have trapezoidal sections transverse the axis of the actuator 1, with respective sides converging substantially towards this axis.
  • the sliding blocks 18 and the respective arcuate base portions 19 can advantageously be made of an anti-friction material such as bronze or of a self-lubricating plastics material but, in any case, of a material less strong than that constituting the cylinder 13.
  • each base portion 19 which faces towards the axis of the actuator 1 is wider than the active portion of the block 18 so that it constitutes a portion of the wall of the cylindrical chamber 9.
  • the sliding blocks 18 are mounted removably on the body 3 so that they can easily be replaced in the event of damage.
  • they are carried by a support ring 20 which is connected to the wall 5 of the body 3, also removably, in a substantially central portion thereof.
  • the wall 5 comprises two symmetrical tubular portions 5a, to each of which a respective connecting flange 22 is anchored at one end.
  • the ring 20 is thus fixed between the flanges 22 by means of clamping screws 25.
  • the ring 20 is shaped so as to define internally a seat which houses the support elements 19 of the sliding blocks 18 and clamps them radially relative to the piston 13 so that they can engage the grooves 15 correctly.
  • the ring 20 may also contribute to the angular restraint of the sliding blocks 18 relative to the ring.
  • it has a number of recesses 27 equal to the number of sliding blocks 18, the recesses being arranged around its inner periphery and each having a shape corresponding to the base portion 19 of a block 18, and opposed pairs of radial shoulder walls 27a.
  • each block 18 is clamped axially relative to the body 3 by opposed radial end faces 23 of the flanges 22 so that the flanges 22 act as axial shoulders for the base portions 19.
  • the seat defined by the ring 20 for housing the blocks 18 consists of a single annular seat delimited radially by a circular wall 28 concentric with the axis of the piston 13.
  • the wall 28 provides for the radial clamping of the base portions 19 abutting it and, in both cases, the portions 19 are restrained angularly by means of elongate members which extend axially from the connecting flanges 22 towards the blocks 18.
  • these members are constituted by cylindrical pins 30 which engage axial holes formed both in the portions 19 and in the flanges 22.
  • these members are constituted by axial appendages 24 which extend integrally from the connecting flanges 22 beyond the faces 23 and are intended to be interposed to act as angular shoulders between adjacent base portions 19.
  • the radially inner surface of the piston 13 has a plurality of axial grooves 35, for example three grooves, each of which is engaged by a guide element 37 which may be constituted by an axial rib projecting radially from a sleeve 40 fixed in a position intermediate two symmetrical tubular portions 7a of the wall 7.
  • Each tubular portion 7a defines an inner cylindrical chamber 42 which is inside and coaxial with the chamber 9 and in which a respective auxiliary, double-acting, linear piston 44, rigidly connected to a hollow rod 46, can slide.
  • the rods 46 project outside the actuator 1 so as to be able to control the movement of a handling member (not shown in the drawings) keyed to each of them and constituted, for example, by a gripping arm transverse the axis of the actuator.
  • the auxiliary pistons 44 are opposed, that is, both facing towards the sleeve 40, and ducts for the admission/discharge of a fluid open into the opposite ends of the chambers 42.
  • the admission of fluid under pressure to both of the chambers 42 through a first common duct 48 formed so as to extend radially through the ring 20 and the piston 13 and both radially and axially through the sleeve 40 enables the pistons 44 to be moved apart, bringing about an axial extension of the portion of the actuator 1 which is rotatable relative to the body 3, so that the handling members keyed to the ends of the rods 46 projecting from the actuator 1 are moved apart telescopically.
  • the supply of fluid under pressure through a pair of interconnected ducts 50 causes the pistons 44 to move towards one another, thereby reducing the axial distance between the handling members at the ends of the rods 46.
  • a splined shaft 54 which extends axially through the sleeve 40 and is fixed thereto by means of a transverse pin 56 engages corresponding axial holes formed through the pistons 44 so that the pistons 44 and hence the hollow rods 46 can slide relative to one another but remain fixed together for rotation.
  • each end of the actuator 1 there is also an annular head 58 which is free to rotate relative to the body 3 and is connected rigidly and removably to a respective tubular portion 7a by means of axial screws 59.
  • Each head 58 is drilled to allow the respective rod 46 to extend through it and a sliding bearing 60 and sealing rings 62 are interposed between it and the rod 46.
  • the body 3 may comprise ducts 64, 66 in the vicinity of the heads 58 for the supply of fluid to any tools carried by the handling members fixed to the rods 46.
  • the ducts 64, 66 open in respective annular chambers formed in the vicinity of the ends of the body 3 and facing the rods 46 radially so as to surround them.
  • ducts 68 formed in the heads 58 open radially into the respective annular chamber and open axially from the heads for the connection of an external distribution pipe (not shown in the drawings).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Braking Arrangements (AREA)
EP96115678A 1995-10-02 1996-09-30 Moteur rotatif à fluide Withdrawn EP0769625A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000781A IT1281373B1 (it) 1995-10-02 1995-10-02 Attuatore rotativo a fluido
ITTO950781 1995-10-02

Publications (2)

Publication Number Publication Date
EP0769625A2 true EP0769625A2 (fr) 1997-04-23
EP0769625A3 EP0769625A3 (fr) 1998-06-03

Family

ID=11413845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115678A Withdrawn EP0769625A3 (fr) 1995-10-02 1996-09-30 Moteur rotatif à fluide

Country Status (2)

Country Link
EP (1) EP0769625A3 (fr)
IT (1) IT1281373B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1238166A1 (fr) * 1999-11-23 2002-09-11 1994 Weyer Family Limited Partnership Outil collecteur hydraulique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8103188U1 (de) * 1981-08-27 Eckart GmbH & Co KG, 6490 Schlüchtern Druckmittelbetätigter Schwenkmotor
DE7511630U (fr) * 1977-10-27 Niederheide, Gustav, 4322 Sprockhoevel
US2765778A (en) * 1954-09-17 1956-10-09 Julian E Gerry Hydraulic actuated steering mechanism
DE1052913B (de) * 1957-08-30 1959-03-12 Karl Marx Stadt Maschf Hydraulische Vorschubeinrichtung, insbesondere fuer Schaelmesser in Zentrifugen
US3731546A (en) * 1971-12-01 1973-05-08 Sundstrand Corp Power operable pivot joint
US4373426A (en) * 1978-11-13 1983-02-15 Weyer Paul P Rotary actuator
DE8601050U1 (de) * 1986-01-17 1986-03-27 Post, Hermann, 6480 Wächtersbach Druckmittelbetätigter Schwenkmotor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1238166A1 (fr) * 1999-11-23 2002-09-11 1994 Weyer Family Limited Partnership Outil collecteur hydraulique
EP1238166A4 (fr) * 1999-11-23 2003-07-30 1994 Weyer Family Ltd Partners Outil collecteur hydraulique
US6612051B2 (en) 1999-11-23 2003-09-02 1994 Weyer Family Limited Partnership Hydraulic collection tool

Also Published As

Publication number Publication date
EP0769625A3 (fr) 1998-06-03
IT1281373B1 (it) 1998-02-18
ITTO950781A0 (it) 1995-10-02
ITTO950781A1 (it) 1997-04-02

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