EP2813712B1 - Unité de piston d'un cylindre plongeur - Google Patents

Unité de piston d'un cylindre plongeur Download PDF

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Publication number
EP2813712B1
EP2813712B1 EP14001623.9A EP14001623A EP2813712B1 EP 2813712 B1 EP2813712 B1 EP 2813712B1 EP 14001623 A EP14001623 A EP 14001623A EP 2813712 B1 EP2813712 B1 EP 2813712B1
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EP
European Patent Office
Prior art keywords
piston
piston rod
guide
cylinder
half shell
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.)
Active
Application number
EP14001623.9A
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German (de)
English (en)
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EP2813712A1 (fr
Inventor
Josef Büter
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.)
Buemach Engineering International BV
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Buemach Engineering International BV
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Publication date
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Publication of EP2813712A1 publication Critical patent/EP2813712A1/fr
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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
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies

Definitions

  • the invention relates to a piston unit for a plunger cylinder with a piston rod and a guide piston
  • Plunger cylinders also called plunger cylinders
  • piston units are generally known from the prior art.
  • the piston units generally have a piston rod and a piston, wherein the piston rod acts as a plunger and the piston serves the axial guidance and is therefore also referred to as a guide piston.
  • Both components are preferably present as two separate components.
  • the guide piston is pressed onto the piston rod, for example, and / or welded to the piston rod.
  • two half-shell-shaped support segments are arranged on the piston rod, which are to ensure the leadership of the piston rod in the described hydraulic cylinder and which form the working piston area.
  • a particularly simple and fast assembly and disassembly of the working piston area should be provided.
  • the solution disclosed here provides that the half-shells fixed to the insertion of the piston rod with the working piston area in the cylinder tube of the hydraulic cylinder in their position and must be secured against unwanted release of the piston rod.
  • the publication DE 10 2011 009 365 A1 discloses a pressure cylinder with a cylinder tube, a longitudinally displaceably arranged in the cylinder tube piston, wherein the piston is provided with a piston guide means for guiding the piston in the radial direction in the cylinder tube and wherein the piston is provided with an extension movement of the piston limiting stop means.
  • a receiving groove extending in the circumferential direction is formed, wherein in the receiving groove consisting of two half-shells piston ring device is installed without tools, which takes over the function of the stopper and / or the piston guide device.
  • the object of the present invention is to provide, while avoiding the disadvantages of the prior art, a piston unit of a plunger cylinder, which can be made particularly simple and inexpensive and which allows cost-effective maintenance.
  • a piston unit according to the invention of a plunger cylinder has a piston rod with a cylinder bottom side end portion and a guide side end portion.
  • cylinder bottom side and guide side in this context represent position information and serve to describe positional relationships of components of the piston unit. They refer to the cylinder base and guide, which constitute components of the plunger cylinder and which are connected to a cylinder tube of the plunger cylinder. The cylinder bottom side end portion of the piston rod is facing the cylinder bottom in the correct installation position, while the guide-side end portion of the piston rod is arranged opposite in the direction of the guide.
  • the guide in this context forms the element which guides the piston rod inside the plunger cylinder.
  • the piston unit is characterized in that the piston rod in the region of the cylinder bottom end section has a circumferential, concave receiving contour.
  • the receiving contour itself in turn has an outer wall on the cylinder bottom side, which encloses an acute angle with the longitudinal axis of the piston rod.
  • the receiving contour can be provided in a simple manner, for example by machining the piston rod, in particular by turning.
  • the receiving contour preferably also has on the guide side an outer wall, which encloses an acute angle with the longitudinal axis of the piston rod, so that both outer walls together form a pointed throat.
  • the cylinder bottom side outer wall of the receiving contour is relevant.
  • the piston unit according to the invention has a guide piston through which the piston unit, when used in a plunger cylinder, in is guided to the cylinder tube.
  • the guide piston is formed according to the invention by a first and a second half-shell, wherein the half-shells are arranged on the piston rod, that the half-shells embrace the piston rod in each case partially.
  • the piston unit is characterized in that the half shells of the guide piston rest with their inner circumferential surfaces on the outer circumferential surface of the piston rod and thus a positive connection between the half shells and the piston rod is provided by which the position of the half shells relative to the piston rod is fixed in the radial direction.
  • the half-shells have, as a particular advantage, mutually corresponding end regions.
  • the end regions of the first half-shell substantially adjoin the end regions of the second half-shell, whereby an overflow channel is provided between the piston chamber and the piston rod chamber.
  • the corresponding end regions may preferably be formed as bevel cuts.
  • end position refers to the arrangement in the assembled state.
  • the half shells can be formed identically and thus no half shells with different end regions have to be provided.
  • the provision costs for the half-shells and thus for the entire piston unit can thus be kept low.
  • the end regions of the half-shells are further designed such that the end regions of the first half-shell have a Umgreifungsversatz to the respective opposite end regions of the second half-shell. This means that the respectively adjoining end portions of the half-shells overhang each other in sections.
  • the half shells each have a circumferential engagement section with an inner engagement contour, wherein the respective engagement section forms the guide-side boundary of the associated half shell and wherein the engagement section is guided into the respective end region of the associated half shell.
  • the engagement contour is retracted relative to the inner circumferential surface of the respectively associated half shell, which means that the radius described by the engagement contour is smaller than the radius described by the inner circumferential surface of the associated half shell.
  • the engagement portion preferably constitutes an inwardly angled region of the half shell.
  • the engagement contour of the respective half-shell is according to the invention designed so that it has an inner wall and that this engages, in particular in an end position of the respective half-shell on the piston rod in the receiving contour of the piston rod.
  • the inner wall of the engagement contour corresponds to the outer wall of the receiving contour, so that in the end position of the half shells on the piston rod a positive engagement of the engagement contour on the receiving contour is provided.
  • the positive engagement of the engagement contour on the outer contour causes a special technological advantage, especially in a load on the piston unit by a pressurized hydraulic medium, a reliable axial position fixing the half shells on the piston rod and a particularly uniform and optimized power transmission from the respective half-shell in the piston rod. This is particularly relevant when the piston unit is fully extended and the axial thrust needs to be absorbed by the guide.
  • each half-shell by means of its engagement contour in a first end region and its, the engagement contour diagonally opposite, section of a second end portion, an angle greater than 180 ° and thus engages around the piston rod.
  • the encompassing of the piston rod can be provided by the half-shells by pivoting the half-shells to one, forming between the end regions of the respective half-shell, axis is made possible by the described special geometries of receiving contour and engaging portion. According to the invention it is provided that the axis about which the pivoting of the half-shells, during the pivoting operation in its position is displaceable.
  • the half-shells can thus first be attached laterally to the piston rod by means of a receiving contour and engagement section and thus be pre-positioned in a simple manner; they can then be pivoted from the cylinder bottom side end portion of the piston rod until reaching the end position.
  • the respective end portions and engaging portions are inventively designed so that the half shells can be positioned on the piston rod such that only one contact point between the engagement contour and the Recording contour and between the respective, the engagement contour axially opposite, section of the associated end portion and the outer circumferential surface of the piston rod adjusts.
  • the half-shells After the correct positioning of the half-shells on the piston rod, they are pivotable about the respective axis forming between the corresponding engagement contour and this diagonally opposite portion of the second end portion such that the engagement contour of the respective half-shell slides completely into the receiving contour of the piston rod.
  • the inner circumferential surfaces of the half-shells to the outer circumferential surface of the piston rod, so that forms a positive connection between the half-shells, both in the region of the engagement contours and in the region of the inner circumferential surfaces, and the piston rod.
  • the particular technological advantages of the assembly process made possible by the inventive design of the half shells and the receiving contour are, in particular, that on the one hand the half shells can be mounted on the piston rod with surprisingly little effort and thus without the use of a force applying assembly tool and that on the other during Pivoting the half shells only minimal elastic deformation of the half shells occur.
  • the required elastic deformations of the half-shells are substantially lower than during an assembly movement, as they would be carried out without the interaction of inventive recording and engagement contour.
  • the receiving contour of the piston rod on the guide side an outer wall, which includes an acute angle with the longitudinal axis of the piston rod.
  • the end regions of the half shells are designed as oblique cuts.
  • an advantageous variant of the piston unit is characterized in that the end portions of the first half-shell are arranged spaced from the respective opposite end portions of the second half-shell on the piston rod, wherein an overflow between the half-shells can be provided by the spacing.
  • the overflow channel having the desired width can already be provided by means of the cutting width of the oblique cuts without additional measures.
  • a plunger cylinder according to the invention has a cylinder tube, a cylinder bottom and a guide and is characterized in that it has a piston unit according to one of claims 1 to 3.
  • the piston unit is guided in a use of the plunger cylinder in the guide and additionally by means of the guide piston in the cylinder tube.
  • the guide and the cylinder bottom constitute the respective closure parts of the plunger cylinder, by which an escape of a hydraulic medium from the cylinder tube is prevented.
  • a plunger cylinder according to the invention is in particular in the above-mentioned, simple and inexpensive provision of the piston unit with the guide piston and, in the use of the plunger cylinder, in the optimized power transmission between the guide piston and the piston rod due to the engagement and concerns of the half shells in or on the receiving contour of the piston rod. Furthermore, an overflow channel between the piston chamber and piston rod space is provided by the arrangement of the half shells without additional means.
  • a preferred development of the plunger cylinder provides that the guide has a conical seat on its side facing the guide piston of the piston unit.
  • the conical seat according to the invention is designed so that it corresponds with an outer wall of the engagement portion and thus forms an optimal end stop for the guide piston and thus for the piston unit.
  • the corresponding design makes it possible to avoid any, uneven force and local force peaks in the guide piston upon reaching the end stop, which in particular damage to the guide piston can be prevented.
  • Fig. 1 shows a piston unit 1 according to the invention of a plunger cylinder in an overall view.
  • the piston unit has a piston rod 3 and a guide piston 4, wherein the guide piston 4 is arranged on a cylinder bottom side end portion of the piston rod.
  • the term cylinder side is derived in this context from the, in Fig. 6 shown cylinder bottom 19 of the plunger cylinder 2 and in this case represents only a direction or position information.
  • the guide piston will, as in Fig. 1 illustrated, formed by a first half-shell 5 and a second half-shell 6, which are arranged on the piston rod 3 and which thereby engage in sections in a circumferential, concave receiving contour 7 of the piston rod 3.
  • Fig. 2 shows a detailed view of the piston unit 1 according to the invention, wherein in the present case only the first half-shell 5 is shown in its end position on the piston rod 3.
  • the receiving contour 7 of the piston rod 3 on the cylinder bottom side has an outer wall 8 which encloses an acute angle ⁇ (alpha) with the longitudinal axis of the piston rod 3.
  • the receiving contour 7 is generated in the present embodiment by means of milling, wherein the receiving contour 7 is formed symmetrically in the vertical direction to simplify the milling process.
  • the first half-shell has a first end region 9 and a second end region 10, the end regions 9 and 10 being provided in each case by an oblique cut, and wherein, on the basis of the selected illustration in FIG Fig. 2 , only the front end portion 9 is visible.
  • Fig. 3 also shows a detailed view of the piston unit 1 according to the invention, wherein in the present case additionally the second half-shell 6 is shown in an assembly position before reaching its end position on the piston rod 3.
  • the second half-shell 6 also has two end regions 11 and 12, whereby only in this case, due to the selected representation, only the front, first end region 11 is visible.
  • both half-shells 5 and 6 have an engagement portion, each with an engagement contour 13, and 14, respectively.
  • the half-shells 5 and 6 are formed such that each half-shell 5, 6, by means of their associated engagement contour 13, 14, in the first end portion 9, 11 and one, the respective engagement contour 13, 14 axially opposite, Section in the second end portion 10, 12 (not shown), an angle greater than 180 ° includes.
  • a recapture of the piston rod 3 is provided by the half-shells 5 and 6, through which a particularly advantageous manner during assembly of the piston unit according to the invention, an unwanted release of the half-shells 5 and 6 is prevented by the piston rod 3.
  • the second half-shell 6 After positioning the second half-shell 6 on the piston rod 3, the second half-shell 6 is pivoted about an axis (not shown) forming between the cylinder-bottom side corner of the first end portion 11 and the leading-side corner of the second end portion 12 (not shown).
  • the pivoting movement is present in Fig. 3 illustrated by the curved arrow.
  • Fig. 4 shows the end position of the second half-shell 6 on the piston rod 3.
  • the end position according to the invention adjusts a positive connection between the half-shells 5 and 6 and the outer circumferential surface of the piston rod 3, wherein the positive connection is representative illustrated by the second half-shell 6.
  • the positive connection is characterized in particular in that the inner wall 16 of the engagement contour 14 of the second half-shell 6 rests against the outer wall 8 of the receiving contour 7. In addition, the inner circumferential surface of the second half-shell 6 abuts against the outer contour surface of the piston rod 3 outside the receiving contour 7.
  • Fig. 4 can also be seen, the half-shells 5 and 6 are arranged in their end position on the piston rod 3 spaced from each other, that between the opposite end portions 9 and 11, or 10 and 12 (not shown) of the half-shells 5 and 6 respectively Overflow 17 forms.
  • a pressure medium (not shown) can flow over from one working space into another working space.
  • FIG. 5a A second half-shell 6 according to the invention is shown in FIG Fig. 5a shown in a side view.
  • FIG. 5a This shows Fig. 5a in particular, the first end region 11 and the second end region 12 of the second half-shell 6, wherein on the cylinder bottom side end of the first end portion 11, an outbreak is shown.
  • Fig. 5b shows a view of the mutually positioned first and second half-shell 5 and 6 from a side-leadership perspective.
  • Fig. 6 shows a plunger cylinder 2 according to the invention with a cylinder tube 18, a cylinder bottom 19 and a guide 20th
  • the plunger cylinder 2 has a pressure medium connection 23, via which a hydraulic pressure medium can be introduced into the cylinder tube 18, or can be discharged from the cylinder tube 18.
  • the plunger cylinder 2 according to the invention comprises a piston unit 1 according to one of claims 1 to 3, wherein the piston unit 1 is guided in the region of the piston rod 3 in the guide 20 and in the region of the guide piston 4 through the inner circumferential surface of the cylinder tube 18.
  • a particular technological advantage of the plunger cylinder 2 is in the present case in connection with its manufacture and in particular in connection with the pre-assembly of the piston unit 1. Due to the provision of the encompassing of the piston rod 3 by the half-shells 5 and 6 of the guide piston 4, an inadvertent release of the guide piston 4th from the piston rod 3, before inserting the piston unit 1 in the cylinder tube 18 of the plunger cylinder 2, effectively prevented.
  • the guide 20 with the conical seat 21 serves in the present case as an end stop for the piston unit 1, by which the maximum extension path of the piston unit 1 is limited in the cylinder tube 18.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (5)

  1. Unité à piston (1) pour un vérin à piston plongeur (2) comportant une tige de piston (3) avec une section d'extrémité sur la face du fond de cylindre et une section d'extrémité sur la face du guidage et comportant un piston de guidage (4), qui est formé par une première demi-coque (5) et une deuxième demi-coque (6), les demi-coques (5, 6) saisissent la tige à piston (3) au moins partiellement,
    est caractérisé en ce que
    la tige à piston (3) forme un contour de logement concave circonférentiel (7) dans la gamme de la section d'extrémité sur la face du fond de cylindre, ledit contour de logement (7) comportant une paroi extérieure sur la face du fond de cylindre (8) et la paroi extérieure (8) formant un angle aigu α (alpha) avec l'axe longitudinal de la tige de piston (3), et que la surface-enveloppe intérieure respective de chaque demi-coque (5, 6) repose sur une surface-enveloppe extérieure de la tige de piston (3) et que les demi-coques (5, 6) sont munies des sections d'extrémités correspondantes (9, 10 et 11, 12) et les sections d'extrémités (9, 10) de la première demi-coque (5) montrent une saisie décalée par rapport aux sections d'extrémités respectivement opposées (11, 12) de la deuxième demi-coque (6) et que chaque demi-coque (5, 6) est munie d'un secteur d'engagement avec respectivement un contour d'engagement sur la face intérieur (13, 14) et que le secteur d'engagement respectif forme la limitation sur la face du guidage pour la demi-coque attribuée (5, 6) et que le contour d'engagement respectivement (13, 14) est rétracté par rapport à la surface-enveloppe intérieure de la demi-coque attribuée (5, 6) et que le contour d'engagement respectivement (13, 14) de la demi-coque attribuée (5, 6) s'engage dans le contour de logement (7) de la tige à piston (3) et que chaque contour d'engagement (13, 14) possède respectivement une paroi intérieure (15, 16), ladite paroi intérieure respective (15, 16) correspondant à la paroi extérieure sur la face du fond de cylindre (8) du contour de logement (7), et que chaque demi-coque (5, 6) renferme un angle de saisie supérieur à 180° - au moyen de son contour d'engagement attribué (13, 14) - dans sa première zone d'extrémité (9, 11) et une section dans sa deuxième zone d'extrémité (10, 12) axialement opposée au contour d'engagement respectif (13, 14).
  2. Unité à piston suivant la revendication 1
    est caractérisée en ce que
    les sections d'extrémité (9, 10, 11, 12) de la demi-coque respective (5, 6) sont conçues comme coupes en biais.
  3. Unité à piston suivant la revendication 1 ou 2
    est caractérisée en ce que
    les sections d'extrémité (9, 10) de la première demi-coque (5) sont espacées par rapport aux sections d'extrémité respectivement opposées (11, 12) de la deuxième demi-coque (6) sur la tige de piston (3), ledit espacement formant un canal de trop-plein(17) entre les demi-coques (5, 6).
  4. Vérin à piston plongeur (2) avec un tube cylindrique (18), un fond de cylindre (19) et un guidage (20)
    est caractérisé en ce que
    ledit vérin est équipé d'une unité à piston (1) suivant une des revendications 1 à 3 et que l'unité à piston (1) est logée dans le tube cylindrique (18) et guidée dans le guidage (20) ainsi qu'à la paroi intérieure du tube cylindrique (18) au moyen du piston de guidage (4).
  5. Vérin à piston plongeur suivant la revendication 4,
    est caractérisé en ce que
    le guidage est muni d'un logement conique (21) sur la face tournée vers le piston de guidage (4), qui correspond à une paroi extérieure (22, 23) du secteur d'engagement respectif des demi-coques (5, 6) et qui forme une butée de fin de course pour l'unité à piston (1) dans le tube cylindrique (18) de cette façon.
EP14001623.9A 2013-06-14 2014-05-08 Unité de piston d'un cylindre plongeur Active EP2813712B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202013005355.0U DE202013005355U1 (de) 2013-06-14 2013-06-14 Kolbeneinheit eines Plungerzylinders

Publications (2)

Publication Number Publication Date
EP2813712A1 EP2813712A1 (fr) 2014-12-17
EP2813712B1 true EP2813712B1 (fr) 2018-01-17

Family

ID=50687241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14001623.9A Active EP2813712B1 (fr) 2013-06-14 2014-05-08 Unité de piston d'un cylindre plongeur

Country Status (2)

Country Link
EP (1) EP2813712B1 (fr)
DE (1) DE202013005355U1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3081820B1 (fr) * 2015-04-16 2017-11-01 Safran Landing Systems UK Limited Actionneur hydraulique et son procédé de production

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2661721A (en) * 1951-11-08 1953-12-08 Ferguson Ltd Harry Hydraulic power actuator
US2821264A (en) * 1954-12-30 1958-01-28 Yale & Towne Mfg Co Ram construction for lift truck
GB980822A (en) * 1960-03-14 1965-01-20 Acrow Eng Ltd Improvements in and relating to props or jacks
CH412625A (de) * 1962-12-07 1966-04-30 Kiekert Friedrich Wilhelm Doppeltwirkender Zylinder-Kolbenantrieb an einer Schwenkschiebetür eines Fahrzeugs
DE9415543U1 (de) 1994-09-26 1994-12-15 Hydraulik Techniek, Emmen Hydraulikzylinder, insbesondere einseitig wirksamer Plunger
DE102011009365A1 (de) * 2011-01-25 2012-07-26 Still Gmbh Druckmittelzylinder mit einer Anschlageinrichtung und einer Kolbenführungseinrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE202013005355U1 (de) 2014-09-15
EP2813712A1 (fr) 2014-12-17

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