WO2012013836A2 - Ressort de gaz à couvercle basculant - Google Patents

Ressort de gaz à couvercle basculant Download PDF

Info

Publication number
WO2012013836A2
WO2012013836A2 PCT/ES2010/070800 ES2010070800W WO2012013836A2 WO 2012013836 A2 WO2012013836 A2 WO 2012013836A2 ES 2010070800 W ES2010070800 W ES 2010070800W WO 2012013836 A2 WO2012013836 A2 WO 2012013836A2
Authority
WO
WIPO (PCT)
Prior art keywords
rod
gas spring
spring
cover
gas
Prior art date
Application number
PCT/ES2010/070800
Other languages
English (en)
Spanish (es)
Other versions
WO2012013836A3 (fr
Inventor
Gabriel Jarava Melgarejo
Oscar Alejos
Félix ESTIRADO
Original Assignee
Azol-Gas, S. L.
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 Azol-Gas, S. L. filed Critical Azol-Gas, S. L.
Publication of WO2012013836A2 publication Critical patent/WO2012013836A2/fr
Publication of WO2012013836A3 publication Critical patent/WO2012013836A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0218—Mono-tubular units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/0209—Telescopic
    • F16F9/0281—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/362—Combination of sealing and guide arrangements for piston rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/366—Special sealings, including sealings or guides for piston-rods functioning as guide only, e.g. bushings
    • F16F9/367—Special sealings, including sealings or guides for piston-rods functioning as guide only, e.g. bushings allowing misalignment of the piston rod

Definitions

  • the object of the present invention is a gas spring provided with a tilting cover designed to absorb non-axial loads, thus preventing the stresses caused by said loads from causing breakdowns and reducing the life of the gas spring.
  • a gas spring is essentially formed by a movable rod along the inner chamber of a hollow cylindrical body, being also provided with a cover to prevent the gas from escaping at the end through which the rod is introduced. Thanks to the presence of a gas confined inside said chamber, the rod acts as a spring or spring: when, starting from a certain resting position, a force pushes the rod into the chamber, the gas is compressed and opposes a growing force with displacement; when the force on the rod ceases, the pressure of the gas returns the rod to its resting position.
  • Current gas springs are normally prepared to work in the axial direction, that is, in the direction of the shaft of the rod and the cylindrical chamber. To do this, they are provided with a flat surface at the end of the rod on which the thrust surface rests.
  • a drawback of current gas springs is that, as a result of the specific configuration and operation characteristics of a particular installation, or of the mounting conditions of the spring itself, vibrations or lateral stresses sometimes occur at points concrete of the rod stroke, causing the gas spring not to work exactly aligned in the direction of its axis. Any component of stress outside the shaft, in turn, causes friction, heat generation and even wear of the pressed area.
  • Gas springs are constructed by assembling machined parts in lathes, which largely ensures that their configuration is concentric and that the support surfaces are perpendicular to the axis of the part.
  • gas springs do not pose misalignment problems with respect to their work axis and the value of static misalignment does not exceed one tenth of a degree.
  • the error is even smaller because the axis in its movement causes both the axis and the top cover to be arranged in the direction of movement.
  • an installed gas spring rests on two surfaces that theoretically are parallel but may have small deviations.
  • gas springs installed in a press
  • the surfaces of the press are sufficiently parallel, but it is another factor to be taken into account in the total composition.
  • a coarse finish can also influence the quality of the gas spring seat on said surfaces.
  • the gas spring is a very elongated element in relation to its base, and therefore a small deviation in its seat can make the oscillation at its upper end be a few millimeters.
  • the upper cover is forced to be oriented according to the working direction of the rod.
  • lateral movements also occur due to the construction of the die itself and the aforementioned inclination of the support surfaces.
  • horizontal movements by the construction of the die these are due to the fact that there are situations in which it is necessary to build a floating treadmill or elements not perfectly guided in the direction of movement of the press, which due to the work they do, they can move horizontally a small distance while the press descends.
  • the support surface of the gas spring is perfectly horizontal and parallel to the base of the press, if the element on which the axis of the gas spring is supported moves horizontally to one side, this will cause lateral stress on the gas spring that will make the guiding elements have to work considerably, even exceeding their maximum effort limit.
  • the gas spring will tend to maintain its verticality, since the support surfaces are horizontal and parallel, but will transmit the lateral stress to the gas spring.
  • the lateral movements are due to the fact that one or both surfaces on which the gas spring is supported while the die is closed are inclined. Because the movement of the press is always vertical, if the gas spring is being compressed with a slight degree of inclination, there will be a displacement on the surface of contact with the die that will cause a lateral load.
  • the forces involved in the gas spring generate a reaction in the components involved in the process that can cause permanent deformation of the guiding elements and a greater inclination to compensate for that effort.
  • the proposed solution consists in having the upper cover and rod assembly oriented at all times perpendicularly to the thrust surface so that no overstress occurs.
  • the lid is basically divided into two portions, an external potion fixed to the cylindrical body and an inner portion provided with the hole into which the rod slides, the inner portion being configured to allow rotational or tilting movements relative to the cylindrical body .
  • the tilting inner portion rotates or tilts to align with said surface.
  • the gas spring with a tilting lid of the invention comprises a hollow cylindrical body that is closed at one end and along whose inner chamber a rod slides.
  • the open end of said cylindrical body is closed by the rod and by an approximately cylindrical shaped lid.
  • the particularity of the cover of the invention is that it is divided into a fixed outer portion integral with the cylindrical body and a tilting inner portion provided with a hole through which the rod slides, both portions being joined by means of a contact surface at least partially spherical that allows the inner tilting portion to be orientable.
  • the spring further comprises an additional O-ring disposed between the fixed portion and the tilting portion of the lid, which prevents gas from escaping from the chamber during oscillations of the tilting inner portion of the lid.
  • the spring also comprises an elastic ring located in the lower part of the cover to hold the inner tilting portion, thus preventing it from falling into the gas spring when the gas is evacuated from the chamber.
  • FIG. 1 shows a gas spring according to the prior art where the effects of non-linear loads with the axis are shown.
  • Fig. 2 shows a known solution to the problem of non-collinear loads with the shaft.
  • Fig. 3 shows a preferred embodiment of the gas spring of the present invention.
  • Fig. 4 shows a preferred embodiment in which the gas spring also has a sliding stop.
  • a conventional gas spring (100) depicted in Fig. 1 is described. It can be seen that it is formed by a cylindrical body (102) into which a rod (103) slides, the inner chamber of the cylindrical body (102) filled with a gas. When the gas is confined inside the chamber, the compression and expansion of the gas when the rod (103) descends or rises causes the spring (100) to behave as a dock.
  • Fig. 1 also shows the different elements arranged between the body (102) and the rod (103) to achieve adequate sealing of the assembly, as well as adequate guidance of the rod (103).
  • the cover (104) is provided, provided with a groove that houses an outer O-ring (105) to prevent gas leaks and other inner housing in which an inner bushing (106) is arranged.
  • Fig. 2 shows another example of spring (200) according to the prior art where similar reference numbers have been used to refer to parts equivalent to those of Fig. 1.
  • This spring (200) has a rounded upper end surface (203) to better accommodate thrust surfaces that are not perfectly perpendicular to the spring axis (200).
  • This solution does not prevent the appearance of excessive loads on the stem generatrix (203) opposite the thrust point, as represented by an arrow.
  • Fig. 3 shows a spring (1) according to the invention where the hollow cylindrical body (2), the rod (3) and the cover (4) can be seen.
  • the cover (4) is formed by two differentiated portions: a fixed portion (4a) and a tilting portion (4b). It can be seen in Fig.
  • the fixed portion (4a) has an approximately cylindrical shape in its lower part, while at the top it has a concave spherical shape that is complemented by the convex spherical shape of the upper part of the tilting portion (4b).
  • This configuration allows the tilting portion (4b) to rotate or tilt in relation to the fixed portion (4a), which is, in turn, fixed to the outer cylindrical body (2). That way, when a Thrust surface not completely perpendicular to the rod (3) exerts a load on the spring (1), the tilting body (4b) rotates, sliding on the fixed body (4a), until it reaches a position where said thrust surface is perfectly seated on the surface of the upper end of the stem (3).
  • the spring (1) comprises an additional O-ring (5) between the fixed portion (4a) and the movable portion (4b).
  • the spring (1) of this example incorporates an elastic ring to prevent the tilting portion (4b) of the cover (4) from falling into the chamber in case the gas is evacuated.
  • the end of the rod (3) of the gas spring (1) comprises a housing in which a sliding element (7) is arranged which is configured so as to have radial displacement capacity with respect to the rod (3) of the spring of gas (1).
  • the sliding element (7) would move laterally with respect to the rod (3), but would not transmit this effort to the gas spring (1 ) absorbing it.
  • FIG. 4 An exemplary embodiment is shown in Fig. 4 in which the sliding element (7) and the cover (4) are combined, although the sliding element (7) can be incorporated into the gas spring without the said tilting cover (4) ).
  • the sliding element (7) has a cylindrical shape and is located in a cylindrical housing of the end part of the stem (3) of the spring (1).
  • a damping means can be oil, for which the sliding support (7) would include a gasket (8) that centers the sliding support (7) and prevents the oil from escaping. Therefore, a gas spring that incorporates both the tilting cover (4) and the sliding support (7) manages to absorb any difference in the supports or in the movement of the die, thus achieving a longer life of the spring of gas (1).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un ressort (1) de gaz pourvu d'un couvercle basculant (4) conçu pour absorber des charges non axiales, ce qui évite donc que les efforts provoqués par ces charges causent des avaries et diminuent la durée de vie utile du ressort (1). Le couvercle (4) est divisé en une partie extérieure fixe (4a) solidaire du corps (2) et une partie intérieure basculante (4b) présentant un orifice sur lequel se déplace la tige (3), les deux parties (4a, 4b) étant unies au moyen d'une surface de contact au moins partiellement sphérique, de sorte que la partie intérieure basculante (4b) est orientable. En outre, le ressort (1) comprend un joint torique (5) supplémentaire disposé entre la partie extérieure fixe (4a) et la partie intérieure basculante (4b) du couvercle (4) pour éviter les fuites de gaz. L'extrémité de la tige (3) comprend aussi un élément mobile (7) qui a une capacité de déplacement radial pour absorber les mouvements horizontaux.
PCT/ES2010/070800 2010-07-26 2010-12-03 Ressort de gaz à couvercle basculant WO2012013836A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201031155A ES2351837B1 (es) 2010-07-26 2010-07-26 Resorte de gas con tapa basculante.
ESP201031155 2010-07-26

Publications (2)

Publication Number Publication Date
WO2012013836A2 true WO2012013836A2 (fr) 2012-02-02
WO2012013836A3 WO2012013836A3 (fr) 2013-04-11

Family

ID=43503559

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ES2010/070800 WO2012013836A2 (fr) 2010-07-26 2010-12-03 Ressort de gaz à couvercle basculant

Country Status (2)

Country Link
ES (1) ES2351837B1 (fr)
WO (1) WO2012013836A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2440093A1 (es) * 2013-12-11 2014-01-27 Azol-Gas, S.L. Placa de apoyo de resortes de gas
CN105156579A (zh) * 2015-09-01 2015-12-16 上海交通大学 一种减振抗冲击液压缸及其抗冲击方法
EA034634B1 (ru) * 2017-11-27 2020-02-28 Общество с ограниченной ответственностью "ТрансЭлКон" Гидравлический демпфер

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1367757A (fr) * 1962-07-07 1964-07-24 Bosch Gmbh Robert Amortisseur hydraulique
DE1230532B (de) * 1965-09-22 1966-12-15 Walter Hunger K G Hydraulikzylinder
DE19816920C1 (de) * 1998-04-16 1999-10-14 Knorr Bremse Systeme Pendelstütze
EP1441145A2 (fr) * 1998-07-23 2004-07-28 Barnes Group Inc. Ressort à faible force de contact
DE102004032411A1 (de) * 2004-07-02 2006-02-09 Zf Friedrichshafen Ag Luftfeder-Schwingungsdämpferbaueinheit
DE102008053227A1 (de) * 2008-10-27 2010-05-12 Carl Zeiss Industrielle Messtechnik Gmbh Befestigung einer Kolben-/Zylindereinheit zur Gewichtskraftkompensation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2817963B2 (ja) * 1989-08-30 1998-10-30 日本発条株式会社 ダイスプリング装置
WO2004081377A2 (fr) * 2003-03-10 2004-09-23 Actuant Corporation Actionneur a element de support de charge exterieur
JP2008157343A (ja) * 2006-12-22 2008-07-10 Pascal Engineering Corp ガススプリング

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1367757A (fr) * 1962-07-07 1964-07-24 Bosch Gmbh Robert Amortisseur hydraulique
DE1230532B (de) * 1965-09-22 1966-12-15 Walter Hunger K G Hydraulikzylinder
DE19816920C1 (de) * 1998-04-16 1999-10-14 Knorr Bremse Systeme Pendelstütze
EP1441145A2 (fr) * 1998-07-23 2004-07-28 Barnes Group Inc. Ressort à faible force de contact
DE102004032411A1 (de) * 2004-07-02 2006-02-09 Zf Friedrichshafen Ag Luftfeder-Schwingungsdämpferbaueinheit
DE102008053227A1 (de) * 2008-10-27 2010-05-12 Carl Zeiss Industrielle Messtechnik Gmbh Befestigung einer Kolben-/Zylindereinheit zur Gewichtskraftkompensation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2440093A1 (es) * 2013-12-11 2014-01-27 Azol-Gas, S.L. Placa de apoyo de resortes de gas
CN105156579A (zh) * 2015-09-01 2015-12-16 上海交通大学 一种减振抗冲击液压缸及其抗冲击方法
EA034634B1 (ru) * 2017-11-27 2020-02-28 Общество с ограниченной ответственностью "ТрансЭлКон" Гидравлический демпфер

Also Published As

Publication number Publication date
ES2351837A1 (es) 2011-02-11
ES2351837B1 (es) 2011-12-02
WO2012013836A3 (fr) 2013-04-11

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