EP0534879A1 - Hydraulischer doppeltwirkenden Arbeitszylinder mit Selbsthemmung - Google Patents

Hydraulischer doppeltwirkenden Arbeitszylinder mit Selbsthemmung Download PDF

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Publication number
EP0534879A1
EP0534879A1 EP92440109A EP92440109A EP0534879A1 EP 0534879 A1 EP0534879 A1 EP 0534879A1 EP 92440109 A EP92440109 A EP 92440109A EP 92440109 A EP92440109 A EP 92440109A EP 0534879 A1 EP0534879 A1 EP 0534879A1
Authority
EP
European Patent Office
Prior art keywords
piston
rod
cylinder
cylinder according
chamber
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.)
Granted
Application number
EP92440109A
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English (en)
French (fr)
Other versions
EP0534879B1 (de
Inventor
Francis Feisthauer
Gérard Ripp
Gilbert Sprauel
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.)
Usines Quiri & Cie Sa Ste
Original Assignee
Usines Quiri & Cie Sa Ste
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
Priority claimed from FR9111966A external-priority patent/FR2681651A1/fr
Priority claimed from FR9112945A external-priority patent/FR2682721A1/fr
Application filed by Usines Quiri & Cie Sa Ste filed Critical Usines Quiri & Cie Sa Ste
Publication of EP0534879A1 publication Critical patent/EP0534879A1/de
Application granted granted Critical
Publication of EP0534879B1 publication Critical patent/EP0534879B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F15B15/26—Locking mechanisms
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/062—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis parallel to the pressing direction

Definitions

  • the present invention relates to a self-locking double-acting hydraulic cylinder for carrying out an immobilization function by pressing pressure to self-maintain when the cylinder is no longer supplied.
  • the rod presses, after pivoting, on a part when it re-enters the body of the jack via a clamping arm, with underside of suitable conformation, mounted at the end of the rod.
  • hydraulic supply conduits and connections accompany the part and its support during machining and the various transit routes.
  • self-locking cylinders consist of a cylinder and of an additional self-locking device of the sleeve type surrounding the rod outside the cylinder body over part of its length.
  • This sleeve with an inner diameter smaller than that of the rod, is mounted tightly on the latter. It has a pressure chamber allowing it to expand sufficiently to release the moving rod.
  • a release pressure from a pressurized fluid frees the rod from the grip of the self-tightening sleeve.
  • the released rod can move, allowing the cylinder to operate.
  • the cylinder rod is therefore immobilized or released at will in a given position by the absence or application of pressure.
  • the primary object of the present invention is to provide a support and blocking force which persists when the pressure of the actuating fluid of the jack is canceled, that is to say even after the removal of all the fluid supply and pressure.
  • Another object of the invention consists in being able to have an instantaneous application blocking force.
  • Yet another goal is to avoid the constant presence of hydraulic connections during the transit and machining of parts.
  • Yet another object of the invention is to allow the workpiece to be immobilized with the rod pivoting movement when the work or the movement of the workpiece requires release of the support.
  • a final goal is to be able to accommodate the self-locking support cylinder in a reduced space due to the integration of the functions.
  • This integration in effect, gives minimal space to the jack according to the invention.
  • the rod is pivotally movable in the piston, but immobilized in translation relative to the latter, said rod comprising at its rear end a hydromechanical device for pivoting actuation.
  • the general inventive idea consists in incorporating into the cylinder of a jack a body of larger section than that of the cylinder so that it is normally locked in this cylinder when it is at rest and to unlock it under the action of a force or a means acting by reaction on this body to expand the cylinder and thus free this body so that it can move.
  • This body acts as a cylinder piston in a rod-piston assembly which becomes momentarily mobile in the cylinder of the cylinder.
  • This invention also aims to achieve a combination of means such that there is no seal (s) on the part of the piston in contact with the cylinder.
  • the self-locking double-acting cylinder consists of a cylinder body 1 conventionally comprising a rod 2 secured to a cylindrical moving body or element or cylindrical piston 3 moving in a cylinder 4 under the effect of the pressure d '' a working fluid.
  • the piston 3 has a generally cylindrical lateral surface comprising, for example in the middle position, a cylindrical projection 5 in contact with the internal wall opposite the cylinder 4 and two cylindrical sliding ends having a driving section and a lateral sliding surface moving along the inner side surface of a cylindrical housing serving as a guide.
  • the cylindrical ends are each connected to the projection 5 by a shoulder.
  • the piston 3 of the cylinder secured to the rod 2 is engaged, by any appropriate means in the outer cylinder 4 of slightly smaller diameter.
  • This cylinder serves on the one hand as a guide during its movements and on the other hand as a clamping sleeve during the blocking period.
  • the cylindrical projection 5 of the piston 3 of the jack is in contact over its entire length with the internal wall opposite the cylinder 4. It has on said external cylindrical projection a single groove helical 6.
  • the outer cylindrical projection 5 of the piston defines with the piston, the cylinder and the cylinder closing parts, on either side of this projection, two sections or end chambers 7 and 8 hydraulically connected together by the helical groove 6 intended to keep them under pressure.
  • a sufficient pressure of oil applied against the internal surface of the cylinder 4 will deform it over practically its entire length due to the elasticity of the metal leading to a functional clearance between cylinder and piston.
  • the internal volume formed by the two end chambers and the helical groove 6 is hydraulically connected by an inlet 9 to a fluid placed under control by pressure by an appropriate generator through a release circuit terminated by a purge 10.
  • This circuit release includes the two end chambers, the helical groove 6, and the generator connected together by conduits. This release pressure makes it possible to cause the local expansion of the cylinder for the release of the piston 3.
  • the cylinder 4 is mounted between two mechanical end closure blocks respectively a front end flange 11 and a rear end flange 12 mechanically joined together by a plurality of connecting rods such as 13, by example four.
  • Each flange 11 and 12 has a coaxial cylindrical shoulder 14 and 15 on which each of the corresponding ends of the cylinder 4 fits.
  • the front flange 11 serves as a guide for the piston rod which passes through it at its center while the rear flange 12 is blind. It has a coaxial sliding-guide cylindrical housing for the rear end of the piston which defines, with the rear driving section of the piston 3, a thrust chamber 16 in communication with the working fluid under pressure by an inlet / outlet port. 17.
  • the front flange 11 defines with the front driving section of the piston 3 a traction chamber 18 in communication with the hydraulic motor circuit by an inlet / outlet 19.
  • Sufficient sealing of the blocking-release zone is provided by suitable end seals such as 20 and 21 between the ends of the cylinder and each of the flanges.
  • Seals 22 and 23 of the high pressure type line the end grooves of the piston outside the cylindrical projection 5.
  • a scraper seal 24 is placed in the front end flange 11 at its crossing by the rod 2.
  • the cylindrical movable element namely the piston 3 and the closing flanges 11 and 12, constitute a real double-acting cylinder supplied by its hydraulic motor circuit of pressurized fluid which opens into the thrust 16 and traction 18 chambers.
  • the rod 2 can also have a head on which any suitable element for pushing or pulling on a part 25 can be mounted.
  • the rod can actuate, by its longitudinal movement, any device or mechanism for returning or transforming movement with a view to simple support or as a return to support support on a part.
  • the pressurized fluid is sent into the release circuit for the release of the mobile assembly.
  • the actuator Shortly thereafter, the actuator is pushed in to impart a direct bearing or traction bearing force on the part to be maintained.
  • the thrust or traction chamber is supplied, and the pressure of the fluid actuates the rod in thrust or in traction. It moves to come into contact with the part.
  • the references PA, PB, PC respectively designate the pressures at points A, B and C, that is to say the pressures corresponding to the thrust forces, of traction by retraction of the rod and to the release pressure.
  • the operation concerns a clamping in thrust, that is to say by direct support rod at the outlet.
  • the cylinder is in the initial position, that is to say immobilized at rest, rod retracted.
  • the part to be held by clamping is placed on its support.
  • the phases leading to the clamping from the initial position proceed as follows.
  • the release pressure is applied at C to release the piston from its grip by the outer cylinder. Then, and while maintaining the release pressure at C, the push pressure PA is applied at A until the desired clamping force is obtained.
  • the PC pressure is removed before the PA pressure is removed.
  • This diet lasts for the time necessary to machining or any other intervention on the immobilized part by clamping.
  • the release is carried out as follows.
  • a push pressure PA is applied. Then, and while maintaining the pressure PA, the piston is released by applying the release pressure PC.
  • the pushing pressure PA is suppressed while applying the pulling pressure PB and maintaining the release pressure PC. After recalling the rod, the traction pressure PB then possibly the release pressure PC are removed.
  • the jack is then found in the initial position corresponding to FIG. 4.
  • One of the advantages of the invention is to be able to easily and quickly rid the carrier assembly or the machining assembly of a part of all the fluidic connections under pressure.
  • clamping arm 26 (shown only in Figures 16 to 19).
  • the rod 2 of the jack is free to pivot in the piston, thanks to an appropriate clearance, and is immobilized in translation by a rear shoulder 27 and by a rod. stop 28 mounted on the rod.
  • Two high pressure seals 29 and 30 provide fluid insulation, between the thrust 16 and traction 18 chambers for one, and between the traction chamber 18 and the outside for the other.
  • a pivoting actuation mechanism 31 of the rod 2 allowing the release of a part to be held 32 (shown only in FIG. 11) after pivoting of the clamping arm 26 mounted at the outer end of the cylinder rod 2 on its head.
  • the pivoting actuation mechanism 31 is housed in the cavity of the rear end flange 12 forming the thrust chamber 16.
  • the pivoting actuation mechanism 31 consists of a hydromechanical device 33 with rack 34 and pinion 35, intended to rotate the rod 2 of the jack on itself, in one direction and in the other, over a certain deflection angular, for example a quarter turn, and manage to free the part 32 thus maintained from the grip of the jack.
  • this hydromechanical device 33 consists of the end of the cylinder rod 2 shaped as an elongated pinion 35, on which the rectilinear translational element with teeth or rack 34 meshes.
  • the rectilinear or rack element 34 has a generally cylindrical shape, shaped on its underside according to rectilinear toothing 36 occupying most of its length.
  • This toothing 36 is mounted in engagement with the pinion 35 formed in the end of the rod 2 of the jack.
  • the rack 34 has a push end 37 fitted with a dynamic seal 38 and an opposite end of stop 39 by its front edge 40.
  • the rectilinear element or rack 34 is arranged transversely to the rod 2 of the jack, and guided at each of its ends by a hollow piece of rack.
  • Each hollow part 41 and 42 defines an interior chamber 43 and 44, respectively of thrust and withdrawal assistance, and is screwed transversely in correspondence with its counterpart in the body of the rear flange.
  • Each hollow part 41 and 42 has an end groove provided with a seal 45, 46. Furthermore, it has a shoulder 47, 48 having at its base an annular groove 49, 50, pierced along a channel of inward communication for the hollow push piece 41, in order to establish hydraulic communication with the working fluid. Each hollow part presses by its shoulder 47, 48 on the adjacent surface by means of a suitable circular flat seal 51, 52.
  • the hollow thrust piece 41 for example that on the left in FIG. 10, has an internal volume which delimits the thrust chamber 43 of the rack, hydraulically connected to the traction chamber 18 by an oblique rectilinear channel 53 extended by a tube longitudinal 54.
  • the hollow abutment piece 42 comprises, at the rear, a shim of thickness 55 screwed onto its bottom, making it possible to stop the stroke of the rack 34 in one direction, and thus to limit the angular deviation of the rod 2.
  • This wedge 55 conditions the angular deviation.
  • clamping arm 26 On the outer end of the rod is mounted the clamping arm 26 or any other part suitable for this clamping by pivoting-support.
  • the references PA, PB, PC respectively designate the pressures at points A, B and C, that is to say the pressures corresponding respectively, firstly to the thrust forces by exiting the rod and its pivoting in the return direction , then to the tensile forces by retraction of the rod and its pivoting go and finally to the release pressure.
  • One of the special features of the invention consists in having the withdrawal chamber 18 of the rod, connected to the pressure source by the orifice B, communicate with the hollow push-piece of the rack 34.
  • the interior volume thereof extends over the entire rear space of the rod 2 of the jack, except in the hollow thrust part 41 of the rack 34 suitably insulated by the seals 45 and 51.
  • This space is filled with oil which is pressurized by connecting port A to the pressure source.
  • the pressure prevailing in the entire thrust chamber 16 of the rod of the jack surrounding the hydraulic pivoting device 31 acts on the rack 34 and causes it to move back in the manner of a plunger, provided that the pressure in the part hollow pressure 41 is zero, that is to say that the orifice B is decompressed.
  • the rod 2 of the jack is pivoted on the angular difference desired by the supply of the hydromechanical pivoting device 31 through the orifice B.
  • the rack 34 moves to the stop on the shim 55 ( Figures 12 and 13), as described above.
  • the rod 2 cannot move longitudinally, because the jack is blocked.
  • the cylinder is then released, rod 2 outlet, by supplying it with C (FIG. 12).
  • Ports A and B are then simultaneously pressurized, while keeping port C supplied.
  • the workpiece 32 rests on two uprights 56 and 57 of a support 58 and on two anti-vibration supports 59 and 60.
  • the maintenance of this workpiece 32 is ensured by two self-locking pivoting cylinders 61 and 62 with arms clamping 63 and 64.
  • the part, thus immobilized, can be machined, for example by a milling tool 65.
  • the clamping is ensured throughout the machining phase by the two self-locking pivoting cylinders 61 and 62 hydraulically disconnected.
EP92440109A 1991-09-24 1992-09-24 Hydraulischer doppeltwirkenden Arbeitszylinder mit Selbsthemmung Expired - Lifetime EP0534879B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9111966 1991-09-24
FR9111966A FR2681651A1 (fr) 1991-09-24 1991-09-24 Verin hydraulique autobloquant a double effet.
FR9112945A FR2682721A1 (fr) 1991-10-16 1991-10-16 Verin pivotant autobloquant perfectionne.
FR9112945 1991-10-16

Publications (2)

Publication Number Publication Date
EP0534879A1 true EP0534879A1 (de) 1993-03-31
EP0534879B1 EP0534879B1 (de) 1997-04-02

Family

ID=26228963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92440109A Expired - Lifetime EP0534879B1 (de) 1991-09-24 1992-09-24 Hydraulischer doppeltwirkenden Arbeitszylinder mit Selbsthemmung

Country Status (6)

Country Link
EP (1) EP0534879B1 (de)
AT (1) ATE151152T1 (de)
DE (1) DE69218713T2 (de)
ES (1) ES2062916B1 (de)
GB (1) GB2259951B (de)
IT (1) IT1255612B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012156320A1 (fr) 2011-05-13 2012-11-22 Technip France Dispositif de fixation d'un premier élément sur une bride de retenue d'un deuxième élément, installation et procédé associés
WO2014177774A1 (fr) 2013-04-30 2014-11-06 Douce Hydro Systeme de blocage de deux pieces en mouvement de translation l'une par rapport a l'autre
CN112576574A (zh) * 2020-12-08 2021-03-30 四川凌峰航空液压机械有限公司 多级轮动释放作动筒

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893210A (en) * 1958-06-17 1959-07-07 Richard S Muszynski Motor
FR1395257A (fr) * 1964-05-12 1965-04-09 American Mach & Foundry Appareil de commande, tel qu'un vérin ou similaire, à verrouillage libérable
US3362301A (en) * 1966-04-20 1968-01-09 Paul C. Kohlitz Fluid actuated clamp
US3815470A (en) * 1970-08-05 1974-06-11 Charmilles Sa Ateliers Servo feed system for machine tool provided with locking mechanism
DE3039818A1 (de) * 1980-10-22 1982-05-27 Maschinenfabrik Hilma Gmbh, 5912 Hilchenbach Schwenkspanner
FR2519386A1 (fr) * 1981-12-31 1983-07-08 Bosq Sylvette Verin pneumatique a piston auto-bloquant
US4534269A (en) * 1981-11-16 1985-08-13 York Industries, Inc. Locking, bearing and actuating apparatus
EP0179325A2 (de) * 1984-10-24 1986-04-30 Applied Power Inc. Schwenkspanner
WO1989009883A1 (en) * 1988-04-13 1989-10-19 Kashima Tsusho Co., Ltd. Evacuation type retainer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053749A (de) *
US3150571A (en) * 1963-05-14 1964-09-29 American Mach & Foundry Actuator
US4781102A (en) * 1981-11-16 1988-11-01 York Industries, Inc. Locking, bearing and actuating apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893210A (en) * 1958-06-17 1959-07-07 Richard S Muszynski Motor
FR1395257A (fr) * 1964-05-12 1965-04-09 American Mach & Foundry Appareil de commande, tel qu'un vérin ou similaire, à verrouillage libérable
US3362301A (en) * 1966-04-20 1968-01-09 Paul C. Kohlitz Fluid actuated clamp
US3815470A (en) * 1970-08-05 1974-06-11 Charmilles Sa Ateliers Servo feed system for machine tool provided with locking mechanism
DE3039818A1 (de) * 1980-10-22 1982-05-27 Maschinenfabrik Hilma Gmbh, 5912 Hilchenbach Schwenkspanner
US4534269A (en) * 1981-11-16 1985-08-13 York Industries, Inc. Locking, bearing and actuating apparatus
FR2519386A1 (fr) * 1981-12-31 1983-07-08 Bosq Sylvette Verin pneumatique a piston auto-bloquant
EP0179325A2 (de) * 1984-10-24 1986-04-30 Applied Power Inc. Schwenkspanner
WO1989009883A1 (en) * 1988-04-13 1989-10-19 Kashima Tsusho Co., Ltd. Evacuation type retainer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012156320A1 (fr) 2011-05-13 2012-11-22 Technip France Dispositif de fixation d'un premier élément sur une bride de retenue d'un deuxième élément, installation et procédé associés
WO2014177774A1 (fr) 2013-04-30 2014-11-06 Douce Hydro Systeme de blocage de deux pieces en mouvement de translation l'une par rapport a l'autre
US9976578B2 (en) 2013-04-30 2018-05-22 Douce Hydro System for blocking relative translational movement between two parts
CN112576574A (zh) * 2020-12-08 2021-03-30 四川凌峰航空液压机械有限公司 多级轮动释放作动筒

Also Published As

Publication number Publication date
GB9220004D0 (en) 1992-11-04
ITMI922187A1 (it) 1994-03-24
IT1255612B (it) 1995-11-09
GB2259951A (en) 1993-03-31
ES2062916R (de) 1996-07-16
ES2062916A2 (es) 1994-12-16
ITMI922187A0 (it) 1992-09-24
GB2259951B (en) 1995-09-06
ATE151152T1 (de) 1997-04-15
DE69218713D1 (de) 1997-05-07
ES2062916B1 (es) 1997-02-16
EP0534879B1 (de) 1997-04-02
DE69218713T2 (de) 1997-11-13

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