EP0674107A1 - Druckmittelzylinder - Google Patents

Druckmittelzylinder Download PDF

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Publication number
EP0674107A1
EP0674107A1 EP95400644A EP95400644A EP0674107A1 EP 0674107 A1 EP0674107 A1 EP 0674107A1 EP 95400644 A EP95400644 A EP 95400644A EP 95400644 A EP95400644 A EP 95400644A EP 0674107 A1 EP0674107 A1 EP 0674107A1
Authority
EP
European Patent Office
Prior art keywords
guide
cylinder
piston
master piston
cylinder head
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Withdrawn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
EP95400644A
Other languages
English (en)
French (fr)
Inventor
Bernard Delery
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.)
Centre D'etudes Et De Distribution De Materiels Specifiques Industriels Zi Des Chanoux
Original Assignee
Centre D'etudes Et De Distribution De Materiels Specifiques Industriels Zi Des Chanoux
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 Centre D'etudes Et De Distribution De Materiels Specifiques Industriels Zi Des Chanoux filed Critical Centre D'etudes Et De Distribution De Materiels Specifiques Industriels Zi Des Chanoux
Publication of EP0674107A1 publication Critical patent/EP0674107A1/de
Withdrawn legal-status Critical Current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
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons
    • 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

Definitions

  • the invention relates to a pressurized fluid cylinder with a full stroke and an adjustable approach stroke, comprising in a cylinder provided with two cylinder heads, a master piston secured to a cylinder rod passing through a cylinder head said front, and between the master piston and the other cylinder head, said rear, an auxiliary piston sliding on a cylindrical guide fixed axially on the rear cylinder, between this cylinder head and a stop defining the end of approach stroke for the master piston pushed by the auxiliary piston, channels for the selective admission of fluid terminating respectively between rear cylinder head and auxiliary piston, between pistons, and between front cylinder head and master piston.
  • the movable member is connected to the end of the jack rod by means of a transmission mechanism which determines the shape and the amplitude of the trajectory of this movable member between a position rest (where the cylinder rod is retracted) and an active position (where the cylinder rod has described its full protruding stroke).
  • the approach stroke cylinders defined above are of fairly rustic construction and simple to operate. Starting from a rest position where the rod is retracted, and the master piston in contact with the auxiliary piston itself in contact with the rear cylinder head, the admission of pressurized fluid, typically compressed air, selectively between the rear cylinder head and the auxiliary piston drives the latter towards the front cylinder head; the auxiliary piston pushes the master piston, and the rod which is integral therewith, until it reaches the stop on the guide, the master piston and the cylinder rod then being at the end of the approach stroke.
  • pressurized fluid typically compressed air
  • the invention provides a pressurized fluid cylinder with a full stroke and an adjustable approach stroke, comprising, in a cylinder provided with two cylinder heads, a master piston secured to a rod of cylinder passing through one of the so-called front cylinder heads and, between the master piston and the other so-called rear cylinder head, an auxiliary piston sliding on a cylindrical guide fixed axially on the rear cylinder head, between this cylinder head and a stop defining the end of approach stroke for the master piston pushed by the auxiliary piston, channels for the selective admission of pressurized fluid terminating respectively between rear cylinder head and auxiliary piston, between pistons, and between front cylinder head and master piston, characterized in that the guide has a bore axial opening into the center of the rear cylinder head through a closable orifice, a cylindrical extension being engaged by a rear end da ns the bore of the guide to an adjustable depth and lockable in this position while it carries on a projecting front end of the guide a sleeve which returns
  • the depth of engagement of the guide extension in the bore thereof can be controlled from the outside as well as the locking of the extension in the guide bore, through the orifice in the center of the rear breech, after removing a plug. It will be appreciated that the engagement of the extension in the guide bore, and the fixing, at the front end of the extension of a socket which returns to cover the guide allows to move the rear edge of the sleeve, which forms the stop for the auxiliary piston, along the guide without, whatever the position of the extension, the auxiliary piston escapes from its sealed guide on the smooth cylindrical surface of the guide.
  • variable volume space between master piston and auxiliary piston extends to the bore of the guide, up to the closed orifice, and the extension is entirely contained in this space, so that it does not no need for a tight seal with the guide.
  • a pressurized fluid cylinder having, in addition to a full stroke, an adjustable approach stroke, conventionally comprises, a cylinder 1 provided with two cylinder heads, a front cylinder head 2 as a whole, and rear cylinder head 3 as a whole, a master piston 4 as a whole integral with a cylinder rod 5 as a whole, which projects through the front cylinder head 2, and an auxiliary piston 6 as a whole, arranged between the master piston 4 and the rear cylinder head 3, and which slides on a cylindrical guide 31 axially fixed on the rear cylinder head 3, between the latter and a stop 34 held at the front end of the guide 31 .
  • the front cylinder head 2 has a flange 20 and a nose 21 which forms a guide for the cylinder rod 5, with a scraper seal 22 b and a seal 22 a .
  • a nose 21 In the nose 21 are housed two bearings 23, 23 ', diametrically opposite and aligned, provided for the oscillating fixing of the jack on a machine.
  • Tie rods of which only the rear ends 10, 10 'with their clamping nuts can be seen in FIG. 1, connect the flange 20 to a flange 30 which constitutes the rear yoke 3.
  • a stepped bore into which the guide 31 is fitted, provided with seals, which will be described in more detail below.
  • the master piston 4 consists of a flange 40 provided, at its periphery in contact with the cylinder 1, with a seal 40 a and with a segment 40 b .
  • a bore is made in the center of the flange 40, which extends on the front face of this flange by a tubular case 41, forming a blind recess for the release of the guide 31 and its equipment.
  • the cylinder rod 5 comes to its rear part 50 to be housed in a counterbore of the flange 40, to which it is fixed by screws 42, while a seal 40 c provides sealing between cylinder rod and master piston.
  • the rear part 50 of the rod 5 is bored to the diameter of the case 41 which has an outer rim engaged in a countersink of the rod, so that the case is locked in position by tightening the screws 42, while a seal 50 has recessed in the bore of the rear part of the rod provides sealing between the case 41 and the rod 5.
  • the rod 5 ends at its anterior end 51 by a threaded bore 51 a , provided for its coupling to a transmission mechanism.
  • the rod 5 has an internal cavity 52, in communication with the atmosphere, which lightens this rod.
  • the auxiliary piston 6 is constituted by a flange 60 having a substantial axial length, to provide effective axial guidance in the cylinder 1, this guidance being provided by two segments 60 b , on either side of a seal. slippery 60 a .
  • the front face of the flange 60 is hollowed out in a bowl, around a central orifice for the passage of the guide 31.
  • a seal 60 c is housed in a counterbore in the center of the front face of the flange 60, and retained by a hard steel washer 61, fixed by through screws 61 a .
  • copper washers are interposed between the head of screw 61a and the rear face of the flange 60.
  • the washer 61 abutting piece form antagonist of the abutment 34 a carried by the guide 31, as will be described now.
  • the guide 31 consists of a cylindrical rod with a head 31a engaged in the rear cylinder head 3.
  • the head 31 is present to the right of its passage through the end plate 30 two cylindrical sections of increasing diameter from the front to the rear, then a flange bearing flat on the external face of the flange 30.
  • the two sections are provided with peripheral seals to ensure the seal between each section and the corresponding steps of the central bore of the flange 30.
  • the mutual arrangement of the steps of the bore and the head portions 31a of the guide 31 cleaning an annular groove into which opens a channel 36 made in the thickness of the flange 30.
  • the guide 31 has over its entire length a threaded axial bore 31 b which opens outwards to the center of the head 31 a ; a threaded plug 37 provided with a washer seal and removably closes off operation in the axial bore 31 b.
  • a lateral bore 31 c in the guide 31 allows communication of the axial bore 31 b with the channel 36 in the flange 30, through the annular groove formed by the reciprocal arrangement of the bore with steps of the flange 30 and the head sections 31 a of the guide 31.
  • a threaded extension 32 is engaged by its rear end in the axial bore 31b of the guide 31 of the front end side thereof.
  • This extension 32 is pierced with a central passage 32 b and has at its front end projecting from the guide 31 a mushroom end 32 c .
  • a sleeve 34 is threaded on the extension 32 carrying on the mushroom end 32 c , and returns to the rear yoke 3 by covering the front end of the guide 31.
  • the rear edge 34 a of the sleeve 34 forms the stop of end of stroke approach cylinder, in cooperation with the washer 61 carried by the auxiliary piston 6, as we have already seen.
  • the rear end of the extension 32 is formed in a prismatic hexagonal imprint 32 a at the entrance of the passage 32 b , so that the depth of engagement of the extension 32, in the axial bore 31 b of the guide 31 , and as a corollary, the position of the end edge 34 a of the sleeve 34, forming the end of approach stop can be adjusted using a rod wrench with a hexagonal section introduced by the bore central 31a of the guide 31, the plug 37 removed.
  • an externally threaded ring 33 is also engaged in the axial bore 31b of the guide 31 to form against nut for locking the extension.
  • the rear edge 33 a of the ring 33 is crenellated, and the internal diameter of this ring is sufficient for the key shank with a hexagonal section to pass through it freely.
  • An additional aliasing tube from that of the wafer 33 has the ring 33 is pushed over the key stem for operating the extension. It is thus possible to unscrew the ring 33 somewhat, then, by joint rotation of the key and the tube, adjust the depth of engagement of the extension 32, then while holding the key fixed, re-lock the ring 33.
  • FIGS. 3 to 5 We start from the rest position shown in FIG. 1, and it is assumed that the position of the extension 32 and of the rear edge of the sleeve 34 has been properly adjusted as explained above, and the plug 37 replaced and blocked.
EP95400644A 1994-03-23 1995-03-23 Druckmittelzylinder Withdrawn EP0674107A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403400 1994-03-23
FR9403400A FR2717866B1 (fr) 1994-03-23 1994-03-23 Vérin à fluide sous pression ayant, outre une course pleine, une course d'approche réglable.

Publications (1)

Publication Number Publication Date
EP0674107A1 true EP0674107A1 (de) 1995-09-27

Family

ID=9461342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95400644A Withdrawn EP0674107A1 (de) 1994-03-23 1995-03-23 Druckmittelzylinder

Country Status (2)

Country Link
EP (1) EP0674107A1 (de)
FR (1) FR2717866B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103498828A (zh) * 2013-09-23 2014-01-08 南京贝奇尔机械有限公司 一种与机架一体的快速位移大吨位油缸
EP3054170A1 (de) * 2015-02-06 2016-08-10 Neuson Hydrotec GmbH Kolben-zylindereinheit mit stellring

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB663723A (en) * 1946-07-22 1951-12-27 Ruston Bucyrus Ltd Improvements in or relating to a cylinder piston assembly
US2921561A (en) * 1958-04-23 1960-01-19 Jack J Sendoykas Fluid cylinder and piston assembly
DE2247596A1 (de) * 1972-09-28 1974-04-04 Volkswagenwerk Ag Zylinderanordnung mit arbeitskolben und vorhubkolben
DE3809461A1 (de) * 1988-03-21 1989-10-12 Mueller Hans Werner Doppelhubzylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB663723A (en) * 1946-07-22 1951-12-27 Ruston Bucyrus Ltd Improvements in or relating to a cylinder piston assembly
US2921561A (en) * 1958-04-23 1960-01-19 Jack J Sendoykas Fluid cylinder and piston assembly
DE2247596A1 (de) * 1972-09-28 1974-04-04 Volkswagenwerk Ag Zylinderanordnung mit arbeitskolben und vorhubkolben
DE3809461A1 (de) * 1988-03-21 1989-10-12 Mueller Hans Werner Doppelhubzylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103498828A (zh) * 2013-09-23 2014-01-08 南京贝奇尔机械有限公司 一种与机架一体的快速位移大吨位油缸
CN103498828B (zh) * 2013-09-23 2016-02-10 南京贝奇尔机械有限公司 一种与机架一体的快速位移大吨位油缸
EP3054170A1 (de) * 2015-02-06 2016-08-10 Neuson Hydrotec GmbH Kolben-zylindereinheit mit stellring

Also Published As

Publication number Publication date
FR2717866A1 (fr) 1995-09-29
FR2717866B1 (fr) 1996-06-07

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