WO2007104671A1 - Ressort pneumatique avec piston amélioré - Google Patents

Ressort pneumatique avec piston amélioré Download PDF

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Publication number
WO2007104671A1
WO2007104671A1 PCT/EP2007/052086 EP2007052086W WO2007104671A1 WO 2007104671 A1 WO2007104671 A1 WO 2007104671A1 EP 2007052086 W EP2007052086 W EP 2007052086W WO 2007104671 A1 WO2007104671 A1 WO 2007104671A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
air spring
joint
spring according
neck portion
Prior art date
Application number
PCT/EP2007/052086
Other languages
English (en)
Inventor
Bradley Ellis Tolchard
Original Assignee
Trelleborg Automotive Uk Ltd.
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 Trelleborg Automotive Uk Ltd. filed Critical Trelleborg Automotive Uk Ltd.
Publication of WO2007104671A1 publication Critical patent/WO2007104671A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/26—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs
    • B60G11/27—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs wherein the fluid is a gas
    • 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
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/05—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type
    • F16F9/057—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type characterised by the piston
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/152—Pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/40—Constructional features of dampers and/or springs
    • B60G2206/42—Springs
    • B60G2206/424—Plunger or top retainer construction for bellows or rolling lobe type air springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/82—Joining
    • B60G2206/8201—Joining by welding
    • B60G2206/82013—Friction or heat welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/82—Joining
    • B60G2206/821—Joining by gluing

Definitions

  • the present invention relates to air springs, in particular for vehicle suspension assemblies .
  • An air spring of this type is disclosed in OS-A- 6, 386, 524. Background Art
  • Air springs otherwise referred to as pneumatic or gas springs, are used for vehicle suspensions in place of conventional steel arrangements such as coil springs. They contribute to the normal functions of the suspension system, namely to keep the wheels in contact with the road surface and insulate and protect the vehicle body and occupants against shock loads and vibration arising for example from a wheel falling into a depression or over a protrusion in the read surface.
  • An air spring typically comprises a flexible elastomeric sleeve with its first end connected to a cover plate and its second end connected to a piston, thus forming an air chamber therebetween containing compressed air.
  • the cover plate is generally mounted to the vehicle f rame w hi the piston is mounted on a wheel axle.
  • a part o f th e piston may extend into the air chamber whereby the chamber i s compressed or extended when the vehicle experiences uneven road conditions.
  • Air springs maintain a predetermined distance between the vehicle chassis and the wheel axles , help to protect the v-hieie body and its occupants from shock loads and provide a comfortable ride for the occupants.
  • air springs may form part of a suspension system that offers load ch a s s i o f the veh i c le is main tai n e d at a s et va l ue rega rd l es s payload.
  • the us e of a ir spr ings a l so provide s th e opt i ons of vari able ride heights, whereby the distance between the axle and thecha ss is m a y be e it he r in c re ased o rd e d re a sed too the r predetermined levels: for example to a level above the specific ride height for increased ground clearance when driving over uneven terrain, or to a level below the specific ride height for easier loading or ⁇ nioadinq of goods ,
  • elastomer ic sleeve rolls over a piston as the spring is compressed or extended.
  • the outer dimensions and profile of the piston are very important to the characteristics of such a spring, such as the force required to compress or extend it by a given aino ⁇ nt.
  • the outer d.irsie ⁇ sions and profile of the piston are therefore taken very carefully into account when designing and manufacturing the spring.
  • a particular object is to provide an air spring with a piston that offers reduced coses in respect of material, rvsarmfacture and assembly.
  • an air spring as provided which comprises a piston and an end member spaced aparc by, an ⁇ seaiingly connected to, a respective end of a flexible resilient element to form a fluid chamber therebetween.
  • the piston comprises an upper part and a lower part each having mutually opposed joint surfaces which are joined together to form a joint for securing the upper part of the piston to the lower part of rhe piston.
  • the piston is characterised in that its lower pare is formed in one piece and comprises a bottom portion and a continuous circumferential neck portion which defines at least a part of an internal cavi ⁇ y, Since the piston of the air spring is rr:anufactured as two separate parts later joined together, cost efficient mari ⁇ f.acturing methods for the respective piston parts snay be applied.
  • the piston parts ⁇ say be giver; a complex shape whilst at the same ti ⁇ ie the manufacturing means shaping the parts is easily retracted from the inanufacuured piston part, including mould corss forming the respective interior of the parts. For example,- no lost core moulding process is necessary.
  • the inventive air spring piston provides tor a signifiantc osts avingg in that che final stage of its production does not involve a complex, possibly wasteful and relatively expensive process of removing mould core material from a part with a complex shape. It also provides potential for reduced weight d ⁇ e to the fact that advanced outer piston-dimensions and profile may be obtained without using additional mould-filling material being a part of the piston.
  • the inventive air spring piston further provides for a manufacturing process where little or no supplementary piston finishing work is needed.
  • the lower part of the piston is manufactured as one piece and comprises a bottom portion, a neck portion and preferably also a shoulder portion r e robust structure and a cost efficient manufacturing method may be applied.
  • a vehicle as part or an air spring system.
  • the shoulder portion of the lower piston part is preferably wider than the neck portion and may have a circumference incr easesfrom from the bottom portion and outwards. This provides for a convenient position of the part of the sleeve when the air spring is in a iso?: ⁇ compressed state.
  • the bottom portion may have a dome-shaped extension into the internal, cavity, which provides for a suitable mounting arrangement of the air spring.
  • the bottom portion may have a fiat-shaped centre portion, which provides for a rigid structure which is cost efficient to manufacture and also for a suitable mounting arrangement of the air sprinq.
  • the joint between the upper part and the lower part may be any of a friction weld joint, an ultrasonic weld joint, an adhesive-bonded joint and a vulcanized joint.
  • any of the described joints provides for an efficient piston part joining process, and little or no material wastage is involved.
  • friction welding is very rapid and efficient in terms of energy consumption, and no additional material is required,
  • the flexible resilient element may comprise a roiling lobe sleeve configured to roll over the piston when the air spring is compressed or extended, which provides for excellent suspension characteristics.
  • the air spring may be a roiling lobe type air spring.
  • the upper part and the lower part of the piston may be made of a thermoplastic material, a thermosetting material, or a plastic-based composite material to ⁇ rov ⁇ de low ma za c o s t ! 1 o w we i g n t a ⁇ u s e 1 e c t r o n of the most su .tarl
  • any of the upper part and lower part may comprise a neck portion and a shoulder portion being wider, than the neck port ion , which provides for an outer pis::on shape resulting Ln improved air spring characteristics.
  • At least one of she opposed joint surfaces may comprise a protrusion extending into a corresponding r&cess formed in the ot ⁇ sr opposed joint surface. This provides for increased joint contact area, improved piston part fusion and thereby a better joint.
  • At least one of the opposed joint surfaces say comprise a step-shaped surface mating a corresponding step-shaped surface formed in the other opposed joint surface, for providing an increased joint contact area.
  • a piston for a roiling lobe type air spring comprising an upper part and a lower part each having mutually opposed joinc s ⁇ rfaees which are joined together to form s i o i Ti t " . for secnrincf en ⁇ upper oarC of the OiSton to the lower part of the piston, said lower part being forced in one piece and comprising a bottom portion and a continuous circumferential neck portion defining at ieast a part of an internal cavity of said lower part
  • the piston according to the invention provides the same advantages as the piston of the air spring described above, and may incorporate any of the above described features of the air spring piston.
  • the invention also provides a method of inanufact ⁇ rinq a piston for an air spring comprising the steps of: forming an upper piston part having a joint surface, forcing a lower piston part having a joint surface,
  • the piston manufacttsring process offers reduced cost and :?ay incorporate any of the features described above in association with the piston.
  • the invention further provides a method of assembling an air spring comprising the steps of: sealingly connecting a first end of a flexible resilient; element to a piston comprising an upper part and a lower part each having a respective and mutually opposed joint surface, which joint surfaces are joined together to form a joint for securing the upper part to the lower part, and sealingly connecting a second end of the flexible resilient element to an end member spaced apart from the pist on ,t o fo rm a fl u id c hambe r e be tw een th e p is to n an d the end member.
  • the air spring assembly process offers reduced costs and the process may incorporate any of the features descr ibed abovein association with spring
  • Fig. 1 is a cross-section of an air spring.
  • Fig, 2 is a cross-seotior; of a spring piston,
  • Fig, 3 is an enlarged view of section A of Fig. 2,
  • Fig. 4 is perspective view o.f the air spring piston of Fig, 2,
  • Fig, 5 is an enlarged view of a second embodiment o a joint for securing the piston parts,
  • Fig, 6 is a cross-section of a second embodiment of a spring piston.
  • Fig, 1 illustrates a rolling lobe type air spring assembly 20 comprising a rubber-wailed cylinder or sleeve
  • the end plate 2 incorporates a valve 24 to enable ingress and egress of
  • the resulting air/gas spring assembly 20 is mounted to a vehicle (not shown) as part of the suspension system, normally with the pis con 1 as the lowermost part.
  • the sleeve 3 drapes over the outer wall of the piston 1 thereby forming lobes. These lobes fold or roil over che wail of the piston 1 as che air spring 20 is compressed or extended,
  • the sleeve 3 has sealing beads 22, 22 at both ends i securing the sleeve 3 to the plate 2 and the piston 1.
  • the lower end 4 of the sleeve 3 is connected to the piston 1 by drawing the bead 22 over a lip to seat in a recess between the lip and a shoulder.
  • the diameter of this recess and the inner diameter of the headed end of the sleeve 3 are so closely matched that a substantially air ⁇ tighc interference fit is forced, which is often referred to as self seal because no adhesives or other
  • sealing arrangements for rolling lobe type air springs 20 other than the beaded example described above may be employed, such as a crimp band [not shown) where the end of the sleeve wail is clamped or crimped into a recess in the piston/plate by a radially deformable annular metal collar or band to provide an air- eight fit.
  • a crimp band [not shown) where the end of the sleeve wail is clamped or crimped into a recess in the piston/plate by a radially deformable annular metal collar or band to provide an air- eight fit.
  • the dashed outline Pl shows a part of the sleeve 3 when the air spring 1 is in a more compressed state
  • the dashed outline P2 shows a part of the sleeve 3 when the piston 1 is in a more extended state.
  • the sleeve 3 constitutes a flexible resilient element, preferably of rubber.
  • Fig. 2 illustrates che piston i having an upper portion or part 7 and a lower portion or part 8.
  • the upper part 7 has a neck or tion 12 and a shoulder portion 13 which is wider than t e neck portion ] /.
  • the lower part 8 is formed in one piece and is defined by a base or bottom portion 27 and a continuous circumferential sidewall or neck portion 25, which defines at least a part of a lower internal cavity 28 and which extends upwards from the bottom portion 27.
  • the base of the lower piston part 8 has an external shoulder portion 26 which is wider than the neck portion 25 and which extends radial ly and along the circumference of the bottom portion 27.
  • the internal cavity 28 is in communication with chamber 6 and encloses an internal space of the assembly 20, This space provides fo a 'softer' air spring than prior-art air springs whic enhances the ride comfort of the air-sprung vehicle.
  • the shoulder portion 26 brings out certain advantages. In what is often known as the 'bump stroke' ,• where the spring 20 is in its fully-compressed state, the shoulder portion 26 at the base of piston 1 forces the spring wall 3 to roil outwards a little. This increases the so-called 'effective area' and, as a result, increases the spring stiffness which is desirable in the bump stroke.
  • the shoulder portion 26 sli g htl y i n creases the av ailable s tro ke of the a i r sprin g 20 - i.e. the amount of available 'travel' between the f u l ly ext e n de d and t h e fu l l y co m p rt e s s e d s tate s of t h sepring 20 W.ith reference to fig.3,the upper part 7 has a 00part7
  • vhe joint surface 3 of the upper part 7 has a protrusion 1*1 extending into a recess 17 of the joint surface 10 of the lower part B
  • the joint surface 10 ox the lower part 8 has a corresponding protrusion 16 extending into a recess 15 or the joint surface 9 of the upper part 7.
  • Both the upper part 7 and the lower part 8 are forced Oy a moulding process using a respective moulding tool.
  • the profile of the two parts 7, 8 is such chat, in each case, both the peripheral part of the moulding' tool and its associated moulding core are easily separated from the respective finished item.
  • the mould core for each piston part 7, 8 can therefore be solid and a lost core or collapsible core process is not required.
  • any suitable moulding technique may be used, such as injection moulding, compression moulding, transfer moulding, blow moulding, vacuum plug assist moulding, pressure plug assist moulding, rotational moulding or
  • the upper part 7 and the lower part 8 are, for example, made of a thermoplastic material and are joined together by friction welding (spin weldings ..
  • the discussed procrusions and recesses should be annular, and the joint surface of each piston part is shaped such that the two mate at least loosely when brought together coaxial Iy and form into a rotational Iy sy ⁇ imstricai joint when welded together.
  • vvith xejhsrence to FiQ , 4 , tne trwo piston narts 7. 8 are rigidly and reieasabiy mounted to a machine (not shown; such that they are coaxial with join ⁇ surfaces 9, 10 adjacent co one another.
  • Trie rr:.acnine provides for both linear and rotational movement of the part attached to Che spindle.
  • the upper part 7 is rotated and drawn into contact with the lower part 3.
  • the machine applies axial force to press the two parts 7, 8 together, and tne friction generaced by the relative rotation of the parts ' ? , 8 coupled with this force generates heat. This builds up sufficiently to Preach the melting point of the material st che contact interface, thereby causing localized melting and fusing together of the two parts ?, 8. Finally * , rotation of the machine spindle is stopped and the force is relaxed.
  • Typical process parameters for spin welding are; tangential, velocity 3-15 m/s, rotational speed 1000-18000 rpm (depending on the part diameter), -welding time 0.25-1 s, holding time 0.5-1 3, cycle time 1-2 s, weld pressure 2-5 MPa.
  • Fig. 5 illustrates an enlarged view of a second errtbodi ⁇ ient of a joint 11 between the upper pare 7 and the lower part S of the piston.
  • the upper part ? has a step- shaped joint surface 18 which is opposed to a step- shaped joint surface 19 of the lower part 8.
  • the piston parts 7 f S are illustrated as slightly offset, but when the parts ⁇ ; S are joined together, there is no void space within the 1 oi nt 11.
  • Fig. 6 illustrates a second embodiment, of a an air spring piston 1 where rhe joint 11 is positioned in a lower portion of the piston 1, meaning that che upper part 7 has e height that is larger than " the height of the lower part S and thereby defines at least, a part of an upper internal cavity 30,
  • the lower part 8 has a neck portion 25 which is relatively shorter than what is showed in Fig, 2.
  • the lower part 8 further nas a shoulder portion 26 which is wider than the neck portion 25.
  • the two piston parts ?, 8 may be joined by ultrasonic welding, by usinq an adhesive for permanently bonding the parts, or by using a suitable substance for joining the parts by vulcanization.
  • the piston parts may also be made of a thermosetting material, and joining method /substances are selected in a known manner for providing a suitable joint, with consideration for the material from which the parts are made.
  • the air spring assembly of the invention is included in an air suspension system of a vehicle .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

L'invention concerne un ressort pneumatique qui comporte un piston (1) et un élément d'extrémité (2), espacé de l'extrémité (4) et relié de façon hermétique à l'extrémité (5) d'un élément élastique flexible (3) pour former entre les deux une chambre (6) à fluide hydraulique. Le piston (1) comporte une partie supérieure (7) et une partie inférieure (8), chacune présentant des surfaces conjuguées se faisant mutuellement face qui sont réunies pour former un joint (11) pour fixer solidement la partie supérieure (7) du piston (1) à la partie inférieure (8) du piston (1). La partie inférieure (8) est une pièce monobloc et comprend une partie de fond (27), une partie de col (25) circonférentielle continue, qui délimite au moins une partie d'une cavité interne (28), et une partie d'épaulement (26) qui est plus large que la partie de col (25).
PCT/EP2007/052086 2006-03-10 2007-03-06 Ressort pneumatique avec piston amélioré WO2007104671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06110947 2006-03-10
EP06110947.6 2006-03-10

Publications (1)

Publication Number Publication Date
WO2007104671A1 true WO2007104671A1 (fr) 2007-09-20

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007035640A1 (de) * 2007-07-27 2009-01-29 Lkh-Kunststoffwerk Gmbh & Co. Kg Tauchkolben
WO2012087917A1 (fr) * 2010-12-20 2012-06-28 Firestone Industrial Products Company, Llc Piston à ressort à gaz et ensemble ressort à gaz l'utilisant
WO2012096996A1 (fr) * 2011-01-10 2012-07-19 Firestone Industrial Products Company, Llc Manchon flexible, ensemble ressort à gaz et procédé
WO2012150068A1 (fr) * 2011-05-04 2012-11-08 Contitech Luftfedersysteme Gmbh Piston de déroulage pour un soufflet roulant d'un ressort pneumatique
WO2013156190A1 (fr) * 2012-04-18 2013-10-24 Contitech Luftfedersysteme Gmbh Piston dérouleur pour soufflet de suspension pneumatique
US20140091548A1 (en) * 2012-10-01 2014-04-03 Firestone Industrial Products Company, LLP End member and gas spring assembly including same
US20140374972A1 (en) * 2011-11-15 2014-12-25 Continental Teves Ag & Co. Ohg Air spring
EP2710276A4 (fr) * 2011-05-17 2015-08-26 Hendrickson Usa Llc Piston pour un ressort pneumatique d'un véhicule utilitaire lourd
EP2376801B1 (fr) * 2008-12-11 2015-10-28 ContiTech Luftfedersysteme GmbH Amortisseur pneumatique
US9261157B2 (en) 2007-09-06 2016-02-16 Firestone Industrial Products Company, Llc Air spring modular piston
US20160108985A1 (en) * 2014-10-17 2016-04-21 Continental Automotive Systems, Inc. Air spring hybrid piston assembly
US9744824B2 (en) 2015-03-25 2017-08-29 Hendrickson Usa, L.L.C. Damping air spring and shock absorber combination for heavy-duty vehicle axle/suspension systems
CN108533758A (zh) * 2018-05-23 2018-09-14 华中科技大学 一种可充放气的双层密封结构及气体弹簧
EP3822100A1 (fr) * 2019-11-15 2021-05-19 Vibracoustic AG Composant formant ressort pneumatique

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Publication number Priority date Publication date Assignee Title
US3181853A (en) * 1963-07-25 1965-05-04 Ford Motor Co Motor vehicle air suspension
US4518154A (en) * 1978-08-22 1985-05-21 Daimler-Benz Aktiengesellschaft Pneumatic spring, especially for motor vehicles
US4650166A (en) * 1984-12-14 1987-03-17 The Goodyear Tire & Rubber Company Two piece piston for airsprings
EP0250820A2 (fr) * 1986-06-23 1988-01-07 The Firestone Tire & Rubber Company Ressort pneumatique pour véhicule
EP0264573A2 (fr) * 1986-09-24 1988-04-27 The Firestone Tire & Rubber Company Ressort pneumatique avec anneau d'étanchéité interne et son procédé de montage
EP0318696A2 (fr) * 1987-12-04 1989-06-07 Bridgestone/Firestone, Inc. Sustension à ressort à air avec isolation à deux voies
US5129634A (en) * 1986-09-02 1992-07-14 The Goodyear Tire & Rubber Company Airspring with partial restraining sleeve
US5671907A (en) * 1995-12-07 1997-09-30 The Goodyear Tire & Rubber Company Method of attachment of flexible member to stamped steel piston
DE19616476A1 (de) * 1996-04-25 1997-11-06 Bayerische Motoren Werke Ag Luftfeder
JP2000097273A (ja) * 1998-09-21 2000-04-04 Toyo Tire & Rubber Co Ltd ローリングスリーブ型空気ばね
US6386524B1 (en) 2000-02-15 2002-05-14 Bfs Diversified Products, Llc Pedestal mounted full reservoir air spring piston
WO2005032863A1 (fr) 2003-10-03 2005-04-14 Trelleborg Ab (Publ) Unite de suspension pneumatique et systeme
DE102004061989A1 (de) * 2004-12-23 2006-07-06 Continental Aktiengesellschaft Luftfeder eines Kraftfahrzeugs

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3181853A (en) * 1963-07-25 1965-05-04 Ford Motor Co Motor vehicle air suspension
US4518154A (en) * 1978-08-22 1985-05-21 Daimler-Benz Aktiengesellschaft Pneumatic spring, especially for motor vehicles
US4650166A (en) * 1984-12-14 1987-03-17 The Goodyear Tire & Rubber Company Two piece piston for airsprings
EP0250820A2 (fr) * 1986-06-23 1988-01-07 The Firestone Tire & Rubber Company Ressort pneumatique pour véhicule
US5129634A (en) * 1986-09-02 1992-07-14 The Goodyear Tire & Rubber Company Airspring with partial restraining sleeve
EP0264573A2 (fr) * 1986-09-24 1988-04-27 The Firestone Tire & Rubber Company Ressort pneumatique avec anneau d'étanchéité interne et son procédé de montage
EP0318696A2 (fr) * 1987-12-04 1989-06-07 Bridgestone/Firestone, Inc. Sustension à ressort à air avec isolation à deux voies
US5671907A (en) * 1995-12-07 1997-09-30 The Goodyear Tire & Rubber Company Method of attachment of flexible member to stamped steel piston
DE19616476A1 (de) * 1996-04-25 1997-11-06 Bayerische Motoren Werke Ag Luftfeder
JP2000097273A (ja) * 1998-09-21 2000-04-04 Toyo Tire & Rubber Co Ltd ローリングスリーブ型空気ばね
US6386524B1 (en) 2000-02-15 2002-05-14 Bfs Diversified Products, Llc Pedestal mounted full reservoir air spring piston
WO2005032863A1 (fr) 2003-10-03 2005-04-14 Trelleborg Ab (Publ) Unite de suspension pneumatique et systeme
DE102004061989A1 (de) * 2004-12-23 2006-07-06 Continental Aktiengesellschaft Luftfeder eines Kraftfahrzeugs

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009015821A1 (fr) 2007-07-27 2009-02-05 Lkh-Kunststoffwerk Gmbh & Co. Kg Piston plongeur
DE102007035640A1 (de) * 2007-07-27 2009-01-29 Lkh-Kunststoffwerk Gmbh & Co. Kg Tauchkolben
US9689455B2 (en) 2007-09-06 2017-06-27 Firestone Industrial Products Company, Llc Air spring modular piston
US9261157B2 (en) 2007-09-06 2016-02-16 Firestone Industrial Products Company, Llc Air spring modular piston
EP2376801B1 (fr) * 2008-12-11 2015-10-28 ContiTech Luftfedersysteme GmbH Amortisseur pneumatique
US8801016B2 (en) 2010-12-20 2014-08-12 Firestone Industrial Products Company, Llc Gas spring piston and gas spring assembly including same
WO2012087917A1 (fr) * 2010-12-20 2012-06-28 Firestone Industrial Products Company, Llc Piston à ressort à gaz et ensemble ressort à gaz l'utilisant
WO2012096996A1 (fr) * 2011-01-10 2012-07-19 Firestone Industrial Products Company, Llc Manchon flexible, ensemble ressort à gaz et procédé
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CN108533758B (zh) * 2018-05-23 2019-09-13 华中科技大学 一种可充放气的双层密封结构及气体弹簧
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