EP4237700A1 - Ressort pneumatique - Google Patents

Ressort pneumatique

Info

Publication number
EP4237700A1
EP4237700A1 EP21798560.5A EP21798560A EP4237700A1 EP 4237700 A1 EP4237700 A1 EP 4237700A1 EP 21798560 A EP21798560 A EP 21798560A EP 4237700 A1 EP4237700 A1 EP 4237700A1
Authority
EP
European Patent Office
Prior art keywords
air spring
piston
bellows
shoulder
attachment
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.)
Pending
Application number
EP21798560.5A
Other languages
German (de)
English (en)
Inventor
Reinhard Stahmer
Boris Balachonzew
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.)
ContiTech Luftfedersysteme GmbH
Original Assignee
ContiTech Luftfedersysteme GmbH
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 ContiTech Luftfedersysteme GmbH filed Critical ContiTech Luftfedersysteme GmbH
Publication of EP4237700A1 publication Critical patent/EP4237700A1/fr
Pending legal-status Critical Current

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
    • F16F9/04—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
    • F16F9/0454—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 characterised by the assembling method or by the mounting arrangement, e.g. mounting of the membrane
    • F16F9/0463—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 characterised by the assembling method or by the mounting arrangement, e.g. mounting of the membrane with separate crimping rings
    • 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
    • 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
    • F16F2224/00—Materials; Material properties
    • F16F2224/02—Materials; Material properties solids
    • F16F2224/0208—Alloys
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/0005—Attachment, e.g. to facilitate mounting onto confer adjustability
    • 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
    • F16F2230/00—Purpose; Design features
    • F16F2230/10—Enclosure elements, e.g. for protection
    • F16F2230/105—Flexible, e.g. bellows or bladder

Definitions

  • the invention relates to an air spring with an elastic air spring bellows, the air spring bellows being connected in a sealed manner to an air spring cover at its first open end and to an air spring piston at its second open end, and thereby at least partially enclosing a working chamber filled with compressed air, the air spring bellows having an air spring attached to the air spring piston rollable rolling fold, wherein the air spring bellows has a fastening bead at least on its one end facing the air spring piston, wherein a radially inwardly extending shoulder area is formed on the bellows-side axial end of the air spring piston, wherein a conical sealing seat is formed radially on the inside of the shoulder area, wherein the fastening bead rests with a radially inner sealing surface on the conical sealing seat of the air spring piston, sealing the working chamber, and the fastening bead with its underside pointing towards the air spring piston along the sealing seat zes is pushed axially towards the shoulder area of the air spring piston.
  • Air springs are known in a variety of designs for applications in different areas. In the vehicle sector, they are clamped between the chassis and body, for example in road or rail vehicles, to achieve comfortable suspension. In the automotive sector, they are also used for cabin mounts and seat suspension. In other applications, they are used, for example, as compensators to compensate for relative movements in pipe systems that are connected to one another, or for mounting machines or other equipment.
  • Air spring bellows are known in various embodiments, inter alia, as rolling bellows with a rolling fold and with a flanged and/or conical fastening bead, as tubular rolling bellows with a clamp fastening or as bellows with several folds.
  • the air spring is under an internal overpressure during operation, with the air spring bellows rolling under the action of a mechanical load and during spring movements with the formation of a rolling fold on an outer contour of the air spring piston.
  • the air spring cover which is usually plate-shaped, is usually located on top of the air spring bellows when the air spring is in the operating position, while the air spring piston is located below.
  • the air spring cover In the case of a chassis air spring of a motor vehicle or rail vehicle, the air spring cover is the interface to the vehicle frame, body or chassis of the vehicle.
  • the air spring piston represents the interface to the vehicle axle.
  • the lower connection component i.e. the air spring piston
  • the air spring piston usually consists of deep-drawn, rolled, whirled and welded sheet steel. However, it can also consist of an injection-moulded, glass-fiber-reinforced or non-reinforced plastic or of die-cast aluminum.
  • a known connection of an end of the air spring bellows to a connecting component is effected by a conically shaped fastening bead, which is pushed onto a likewise conical area of the connecting component.
  • DE 10 2008 055 511 A1, DE 10 2008 055 512 A1 and EP 1 797 346 B1 show, for example, air springs with an air spring piston and an air spring bellows, the air spring bellows having a fastening bead with a bead core on its end facing the air spring piston. With its conical sealing surface, the bead is in sealing contact with a conical sealing seat of the air spring piston. In the upper area, the conical sealing seat also has a pull-off safety device designed as a holding lug for holding the fastening bead.
  • DE 10 2010 036 972 A1 and WO 2013/182 419 A1 show air springs with conical sealing seats, in which locking or clamping rings are arranged as a safety catch, which are inserted in a groove of the air spring piston to prevent a conical fastening bead of the air spring bellows from slipping off secured axially by the conical sealing seat.
  • EP 2 690 306 A1 shows an air spring with a cylindrical sealing seat, a hollow-cylindrical air spring piston with its pot-shaped interior being in constant air exchange with a working space surrounded by air spring bellows.
  • the air spring bellows At its open end facing the air spring piston, the air spring bellows has a fastening bead which encompasses the radially inner lateral edge of the air spring piston and bears sealingly against this inner lateral edge.
  • the fastening bead is held in its position on the air spring piston by a fastening ring in that the air spring bellows encompasses the fastening ring like a loop.
  • the fastening ring has a wedge-shaped section which corresponds geometrically to a section of the fastening bead which is also wedge-shaped during operation. It is disadvantageous that the manufacture and/or assembly of an air spring piston with a connection for the air spring bellows made radially on the inside, in particular when a conical sealing seat is provided, is often difficult and expensive.
  • the arrangement and design of such a trigger safety device adjacent to the sealing seat of the air spring piston causes difficulties during production, for example due to inaccessibility when applying the tool for forming sheet metal pistons or when removing cast pistons from the mold.
  • the formation of a conical sealing surface, a retaining lug or flanged tabs is relatively difficult and expensive.
  • air spring pistons made of plastic injection molding or die-cast aluminum loosening and removing a conical sealing surface or a retaining lug from the mold is difficult during the manufacturing process and usually requires several work steps or special devices.
  • the ring In the case of air spring pistons with a ring inserted in a groove as a safety catch for the air spring bellows, the ring can be mounted on an axial axis without difficulty. In the case of an air spring piston on which the air spring bellows is held on the piston by means of a clamping ring, clamping on a retracted clamping area is not possible because of the inaccessibility for the jaws.
  • the invention is based on the object of presenting an air spring of the type mentioned at the outset, i.e. with an elastic air spring bellows and an air spring piston on which the air spring bellows rolls, the air spring piston having an axially retracted support shoulder with a sealing seat for the air spring bellows, which described disadvantages does not have.
  • an air spring of the type mentioned at the outset i.e. with an elastic air spring bellows and an air spring piston on which the air spring bellows rolls, the air spring piston having an axially retracted support shoulder with a sealing seat for the air spring bellows, which described disadvantages does not have.
  • one should such air springs can be produced simply and inexpensively and are easy to assemble.
  • This air spring should also be suitable for use in air spring systems for road vehicles, rail vehicles and industrial applications.
  • the invention was based on the finding that the increased loads and comfort requirements for air springs and the increased requirements for simple and cost-effective production of an improved end-side fastening of the fastening bead of the air spring bellows on the connecting part arranged at the bottom in the position of use as well as a secure, pressure-resistant and tensile sealing of the work space required. This is achieved by a modified design and assembly of a shoulder area of the air spring piston, including the sealing seat and the attachment of the attachment bead.
  • the invention therefore relates to an air spring with an elastic air spring bellows, the air spring bellows being connected in a sealed manner to an air spring cover at its first open end and to an air spring piston at its second open end, thereby at least partially enclosing a working chamber filled with compressed air, the air spring bellows having an am Air spring piston forms a rollable rolling fold, the air spring bellows having a fastening bead at least on its one end facing the air spring piston, with an axially constricted shoulder area being formed on the bellows-side end of the air spring piston, on the radially inner end of which a sealing seat is formed, the fastening bead with its sealing surface the sealing seat of the air spring piston sealingly abuts the working chamber, and the fastening bead with its underside pointing towards the air spring piston extends along the sealing seat in the direction of the shoulder area of the air spring piston pushed.
  • the invention provides for this air spring that a separate, ring-shaped piston shoulder attachment is arranged on the shoulder area of the air spring piston, that this piston shoulder attachment has a radial inner side which directly or indirectly borders on the radial outer side of the fastening bead of the air spring bellows, and that the piston shoulder attachment has a radial outer side which is radially flush with a radial outer contour of the air spring piston at least in the region of its largest outer diameter, so that the attachment nestles against the piston shoulder.
  • a piston shoulder attachment is understood to mean an add-on part for the axial extension of the shoulder area of an air spring piston.
  • the shoulder area of an air spring piston is also called the bearing shoulder.
  • the proposed technical solution creates an air spring that is easy to manufacture and easy to assemble, even with a sealing seat on the air spring piston that is arranged radially deep inside.
  • the piston shoulder attachment with the features of the invention can be mounted on the air spring piston in a separate work step.
  • the placement of the piston shoulder attachment can advantageously take place after the assembly of the air spring bellows.
  • the air spring can be designed for air spring pistons which have a trigger safety device to protect the air spring bellows against unintentional detachment from its end attachment to the air spring piston, and also for air spring pistons without such a trigger safety device.
  • the shoulder area of the air spring piston can be designed in a structurally simplified manner in such a way that forming tools can be attached more easily or casting molds can be handled more easily during piston production. This is made possible in that the shoulder area of the air spring piston at the axial end is only completed in a separate assembly step using the attachment.
  • the air spring bellows are supported by the piston shoulder attachment on the shoulder area of the air spring piston and, when the air spring is in operation, rolls safely over the piston shoulder attachment on the piston skirt.
  • the rolling bellows can also protect the attachment from slipping radially on the shoulder area of the air spring piston or center it relative to the piston. It is also possible to remove the assembled piston shoulder attachment from the shoulder area of an air spring piston. This enables easy and non-destructive disassembly of the air spring.
  • a conical sealing seat and a radially circumferential retaining lug can be easily molded into the material if required, since the piston shoulder attachment can be installed in a later work step.
  • the support shoulder or the piston shoulder area can be formed in one plane, ie without elevations or depressions. The piston shoulder attachment and the bearing shoulder are therefore not in the way of a rolling tool or the like when forming the sealing seat and retaining lug on the piston body.
  • air spring pistons which have clamping devices for fastening the fastening bead can be produced in which the clamping device, for example a clamping ring, has a smaller diameter than the outside diameter of the air spring piston or the piston skirt on which the air spring bellows rolls.
  • the assembly of the clamping ring is facilitated by the fact that it is possible to position the piston shoulder attachment in its final position only after the clamping ring has been inserted into a piston groove or the like.
  • the radial distance between the clamping ring outer diameter and the radially outer piston diameter can be virtually bridged by the piston shoulder attachment.
  • the piston diameter and the outer diameter of the clamping ring can therefore be designed largely independently of one another.
  • the load-bearing capacity of the air spring is not impaired by a clamping device for the air spring bellows with a reduced diameter.
  • a clamping device for the air spring bellows with a reduced diameter With an air spring bellows that is clamped on a sealing seat arranged radially on the inside, with the help of the piston shoulder attachment, a larger spring deflection in the direction of a deflection of the air spring can be achieved compared to an air spring bellows clamped on the outer circumference of the air spring piston.
  • a greater spring deflection can also be achieved with a piston with a conical seal and horizontal shoulder using the shoulder attachment.
  • the attachment represents a piston skirt extension without increasing the installation length or reducing the freedom of movement.
  • the piston shoulder attachment consists of at least two individual ring segments, the ring segments lying against one another at their ends in the assembled state and thereby geometrically forming a continuously closed ring. Accordingly, the piston shoulder attachment can be made in several parts.
  • a multi-part piston shoulder attachment can consist of two ring segments, for example.
  • fastening bead of the air spring bellows is particularly stiff or if its diameter is so large that a one-piece piston shoulder attachment cannot be pulled over the fastening bead, or only with difficulty, during assembly.
  • a piston shoulder attachment that is divided twice over its circumference can simply be placed around the fastening bead.
  • the piston shoulder attachment consists of at least two individual ring segments which, when assembled, form a continuously closed ring, with the ring segments being able to be positively connected to one another with connection means arranged on the ring segments, such as snap or latching elements.
  • the piston shoulder attachment can consist, for example, of two ring segments of the same size and structurally identical, each of which has a latching hook and at one end have their other end a locking groove, which are brought into engagement with each other during assembly. This results in a tightly closed ring in the assembled state, in which disturbing relative movements of the ring segments are excluded when the air spring deflects and compresses.
  • the piston shoulder attachment is designed as a hollow body, which has a radial outside and a radial inside, which are firmly connected to one another in one piece by a rib structure arranged between them.
  • a weight-optimized, ie particularly light and yet very stable piston shoulder attachment is formed, which is well secured against deformation due to loads in spring operation.
  • the piston shoulder attachment is designed so that it can be placed loosely on the shoulder area of the air spring piston. Accordingly, it is sufficient to place the piston shoulder attachment on the shoulder area of the air spring piston, since the piston shoulder attachment will automatically come into contact with the air spring piston when the fully assembled air spring is in operation. This makes the installation of the air spring particularly easy.
  • piston shoulder attachment can be connected to the shoulder area of the air spring piston by means of connecting means in a non-positive and/or material connection. Accordingly, the piston shoulder attachment can be firmly connected to the shoulder area of the air spring piston, for example by screwing, clamping and/or gluing. As a result, the piston shoulder attachment is secured against lifting off the shoulder area of an air spring piston in spring operation.
  • the air spring with the features of the invention can be constructed with air spring pistons made of different materials. Accordingly, the air spring piston, depending on the requirements for strength, temperature resistance and/or chemical resistance, as a deep-drawn sheet steel formed part, as a plastic injection molded part or as a die-cast part made of a cast alloy, such as die-cast aluminum or die-cast zinc.
  • the invention also relates to an air spring piston of an air spring, which is constructed in accordance with at least one of the features described and defined in the device claims.
  • FIG. 1 shows a section of an air spring with an air spring bellows, an air spring piston and a piston shoulder attachment in an axial longitudinal section in a plane running along a longitudinal axis of the piston shoulder attachment according to a first embodiment of the invention
  • FIG. 2 shows a perspective view of the piston shoulder attachment according to FIG. 1,
  • FIG. 3 is a perspective view of part of a two-piece piston shoulder attachment according to a second embodiment of an air spring according to the invention.
  • FIG. 4 shows the piston shoulder attachment according to FIG. 3 in cross section of a plane running perpendicular to the longitudinal axis of the piston shoulder attachment
  • FIG. 5 shows a section of an air spring with a piston shoulder attachment in axial longitudinal section similar to that in FIG. 1 but according to a third embodiment of the invention
  • FIG. 6 shows a perspective view of the underside of the piston shoulder attachment near the piston according to FIG. 5,
  • FIG. 7 shows a section of an air spring with a piston shoulder attachment in axial longitudinal section according to a fourth embodiment of the invention
  • FIG. 8 shows a portion of an air spring with a piston shoulder attachment in axial longitudinal section according to a fifth embodiment of the invention.
  • FIG. 9 shows a perspective view of the underside of the piston shoulder attachment near the piston according to FIG.
  • the first air spring 1a shown in detail in FIG. 1 has an air spring cover 2 (only indicated) and a first air spring piston 6a, to which a first air spring bellows 3a is fastened in a sealing manner, each with an open end.
  • the air spring bellows 3a is made of an elastomer, at least partially delimits a working chamber 4 filled with compressed air, and rolls during operation, forming at least one rolling fold 5 on the first air spring piston 6a.
  • the connection of the air spring piston 6a on the air spring cover side is not the subject of the invention, so the following description is limited to the connection of the air spring bellows 3a on the air spring piston side.
  • the first air spring bellows 3a accordingly has at its open end on the piston side a first fastening bead 7a which is designed as a ring and is conical in the axial section of the air spring body.
  • Air spring bellows 3a can be inserted into the elastomer with a not shown Tissue be reinforced as a reinforcement, wherein the reinforcement is preferably connected to the bead core 8.
  • the fastening bead 7a is arranged on a first sealing seat 9a which is conical in the axial section of the air spring piston 6a.
  • This sealing seat 9a is formed on a first cylindrical piston extension 11a of the air spring piston 6a on the working chamber side and has a smaller outside diameter in comparison with the outer contour 12a of the casing of the air spring piston 6a.
  • a first shoulder region 10a which extends radially, is formed between the piston extension 11a and the radial outer contour 12a of the casing of the air spring piston 6a.
  • the fastening bead 7a of the air spring bellows 3a nestles with its radially inner first sealing surface 13a against an associated first sealing surface 24a of the first sealing seat 9a or of the piston extension 11a in a sealing manner. With its underside 14a, the fastening bead 7a sits at a distance from the shoulder area 10a of the air spring piston 6a. With its radial outer side 15a, the fastening bead 7a bears with play on a first piston shoulder attachment 16a, which is described in more detail below.
  • a first trigger safety device 17a is arranged on this first air spring 1a, which secures the fastening bead 7a against being pulled off.
  • the trigger safety device 17a is designed here as a safety ring, which is inserted in a groove arranged in the piston extension 11a of the air spring piston 6a above the fastening bead 7a and protects the fastening bead 7a against being pulled off its sealing seat 9a by tensile forces which occur during operation of the first air spring 1a in Are generated in the axial direction and attack on the air spring bellows 3a and the fastening bead 7a, secures.
  • the first piston shoulder attachment 16a shown in perspective in FIG. 2 is produced according to a first exemplary embodiment of the invention as a one-piece plastic injection molded part.
  • This piston shoulder attachment 16a is in axial section Air spring 1a here essentially conical and in his of the
  • the piston shoulder attachment 16a is designed as an annular hollow body, between whose radial outside 18a (outer shell) and radial inside 19a (inner shell) a rib structure 20 is formed that connects these firmly and dimensionally stable to one another.
  • a piston shoulder attachment can be produced, for example, as a solid body made of plastic or die-cast aluminum.
  • the first piston shoulder attachment 16a according to FIGS. 1 and 2 is placed loosely on the shoulder area 10a of the air spring piston 6 in the present case.
  • the piston shoulder attachment 16a is first pushed over the first fastening bead 7a on the piston side.
  • the first fastening bead 7a is then pushed or pressed onto the sealing seat 9a.
  • the trigger safety device 17a designed as a safety ring, is inserted into the associated groove of the piston extension 11a of the piston 6a.
  • the piston shoulder attachment 16a is then pulled down over the first fastening bead 7a in the direction of the shoulder area 10a of the air spring piston 6a.
  • the air spring bellows 3a is rolled up or rolled over the piston shoulder attachment 16a and the air spring piston 6a.
  • the first air spring bellows 1a nestles against the radial outside 18a of the piston shoulder attachment 16a and further against the radial outer contour 12a of the air spring piston 6a.
  • Air spring 1a is therefore defined--in addition to the outside diameter of the air spring in operation--not by the outside diameter of the first fastening bead 7a, but by the larger outside diameter of the piston shoulder attachment 16a or the outside diameter of the air spring piston 6a.
  • the piston length that can be used for rolling is extended for the air spring bellows 3a.
  • FIGS. 3 and 4 show a second piston shoulder attachment 16b which, like the first piston shoulder attachment 16a according to FIG. 2, is designed as a ribbed hollow body made of plastic.
  • this second piston shoulder attachment 16b is divided twice on its circumference, resulting in two ring segments 16b1, 16b2 of the same size.
  • the two ring segments 16b1, 16b2 each have a locking lug 22 and a locking groove 23, which engage in the assembled state of the second piston shoulder attachment 16b and produce a non-positive and positive locking connection 21.
  • the two-part second piston shoulder attachment 16b can only be assembled during the assembly of the air spring, thereby facilitating assembly on the air spring piston 6a.
  • FIG. 5 and FIG. 6 show another development of the air spring 1a according to FIG. 1 with a third piston shoulder attachment 16c.
  • This third piston shoulder attachment 16c is shown in perspective in FIG. 6 and is produced as a one-piece sheet metal part, for example as a deep-drawn sheet steel part.
  • the profile of the third piston shoulder attachment 16c is geometrically based on or identical to the conical, upwardly rounded profile of the first piston shoulder attachment 16a according to FIG.
  • FIG. 5 shows the third piston shoulder insert 16c in the installed state on the otherwise structurally identical air spring 1a according to FIG.
  • FIG. 7 shows a detail of a fourth embodiment of a second air spring 1b having the features of the invention, in which this second air spring 1b has a second air spring piston 6b and a second air spring bellows 3b. At its open end on the air spring piston side, this second air spring bellows 3b has a second fastening bead 7b which is designed as a ring and is conical in the axial section of the air spring body. An annular bead core 8 is also vulcanized into this second fastening bead 7b.
  • the second fastening bead 7b is arranged on a second sealing seat 9b which is conical in the axial section of the second air spring piston 6b.
  • This second sealing seat 9b is formed on a working chamber-side cylindrical second piston extension 11b of the second air spring piston 6b with a smaller outside diameter than this second air spring piston 6b.
  • a second shoulder region 10b is formed radially between the second piston extension 11b and the outer contour 12b of the casing of the second air spring piston 6b.
  • the fastening bead 7b of the second air spring bellows 3b nestles with its radially inner second sealing surface 13b against an associated second sealing surface 24b of the second sealing seat 9b in a sealing manner.
  • the second fastening bead 7b sits close to the shoulder area 10b of the second air spring piston 6b.
  • the second fastening bead 7b rests with its radial outside 15b on a fourth piston shoulder attachment 16d.
  • a second trigger safety device 17b is formed on the second air spring 1b, which axially holds the second fastening bead 7b.
  • This second trigger safety device 17b is designed as a circumferential retaining lug which axially and radially overlaps the fastening bead 7b above its radially inner sealing surface 13b.
  • the fourth piston shoulder attachment 16d is designed as a one-piece, deep-drawn, half-shell-shaped sheet steel formed part. Due to its geometry and in particular due to its radial outer side 18b, this fourth piston shoulder attachment 16d axially extends the outer contour 12b of the radially outer jacket of the second air spring piston 6b. In the axial section of the second air spring 1b according to FIG. 7 it can be seen that the second piston shoulder attachment 16d is of essentially circular design and is angled on its radial inner side 19b towards the radial outer side 15b of the fastening bead 7b and is adapted to the contour of the fastening bead 7b.
  • the shape of the shoulder attachment 16d is also adapted to the piston shoulder area 10b and the radius from the transition of the shoulder to the piston outer contour 12b.
  • the attachment is also centered on the piston.
  • the axial height of the fourth piston shoulder cap 16d is less than that of the first piston shoulder cap 16a according to FIG.
  • the fourth piston shoulder attachment 16d is placed on the shoulder area 10b of the second air spring piston 6b and then the air spring bellows 3b is pulled onto the second sealing seat 9b.
  • the trigger safety device 17b and the piston shoulder attachment 16d ensure, when installed, that the bellows bulge 7b is held securely on the associated sealing seat 9b.
  • FIGS. 8 and 9 show a third air spring 1c, which has a third air spring piston 6c and a third air spring bellows 3c. 8 again shows only a graphic section of the third air spring 1c.
  • This third air spring bellows 3c accordingly has at its open end on the air spring piston side a third bellows end piece 7c which is designed as a ring and is cylindrical in the axial section of the air spring body.
  • the third bellows end piece 7c is in engagement with a radial depression in a third cylindrical piston extension 11c of the third air spring piston 6c, this depression forming a third sealing seat 9c.
  • the third sealing surface 24c of the third sealing seat 9c and the geometrically matching third sealing surface 13c of the third bellows end piece 7c are in the present case formed with multiple grooves over the circumference, such that opposing circumferential grooves and elevations are mutually engaged with one another.
  • the third bellows end piece 7c is surrounded on its radial outside 15c by a third safety catch 17c designed as a clamping ring and is clamped against the third sealing seat 9c by means of this.
  • the third sealing seat 9c is formed radially on the inside in relation to the third outer contour 12c of the third air spring piston 6c, so that a third shoulder area 10c is formed on the third air spring piston 6c, which extends radially.
  • the third trigger safety device 17c is surrounded radially on the outside by a fifth piston shoulder attachment 16e, which is arranged at least partially placed on the third shoulder region 10c of the third air spring piston 6c.
  • This fifth piston shoulder attachment 16e has a U-shaped profile geometry in cross section. In the assembled state, the radial outside 18c of its radially outer leg of the U runs flush with the radial outer contour 12c of the third air spring piston 6c. The radially inner leg of the U of the fifth The radial inner side 19c of the piston shoulder attachment 16e rests in a form-fitting manner on the third trigger safety device 17c, which is designed as a clamping ring.
  • FIG. 9 shows the fifth piston shoulder attachment 16e in a perspective view with a view of its recess.
  • this fifth piston shoulder attachment 16e is produced as a one-piece deep-drawn formed part from sheet steel.
  • the assembly of the third air spring 1c is analogous to the assembly of the first air spring 1a already described, with the fifth piston shoulder attachment 16e only being placed on the shoulder area 10c in a final assembly step. Accordingly, first the fifth piston shoulder attachment 16e is pushed over the air spring bellows 3c, then the trigger safety device 17c designed as a clamping ring. The still cylindrical third bellows end piece 7c is then pushed onto the sealing seat 9c. Then the trigger safety 17c designed as a clamping ring is pushed over the bellows end piece and clamped and finally the fifth piston shoulder attachment 16e is pulled down over the trigger safety 17c onto the shoulder area 10c of the piston 6c. The air spring bellows 1c nestles against the radial outside 18c of the fifth piston shoulder attachment 16e as it rolls during operation of the air spring 1c.
  • the arrangement of the fifth piston shoulder attachment 16e advantageously combines a small-diameter trigger safety device 17c with a large rolling diameter of the air spring bellows 3c on the air spring piston 6c, namely the outer diameter of the fifth piston shoulder attachment 16e.
  • the diameter of the trigger safety device is also the rolling diameter of the air spring bellows on the air spring piston, a higher load capacity of the air spring 1c can be achieved in the present case.

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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 (1a) pourvu d'un soufflet élastique à ressort pneumatique (3a), le soufflet à ressort pneumatique étant relié de manière étanche à l'air à un couvercle de ressort pneumatique (2) au niveau de sa première extrémité ouverte et à un piston de ressort pneumatique (6a) au niveau de sa seconde extrémité ouverte et, de ce fait, entoure au moins partiellement une chambre de travail (4) qui est remplie d'air comprimé, le soufflet à ressort pneumatique formant un pli enroulé (5) qui peut s'enrouler sur le piston à ressort pneumatique (6a), le soufflet de ressort pneumatique présentant un talon de fixation (7a) au moins au niveau de son extrémité tournée vers le piston à ressort pneumatique, une zone d'épaulement s'étendant radialement vers l'intérieur (10a) étant conçue au niveau de l'extrémité axiale côté soufflet du piston de ressort pneumatique (6a), un siège d'étanchéité conique (9a) étant disposé radialement à l'intérieur sur la zone d'épaulement, le talon de fixation étant en appui avec une surface d'étanchéité radialement intérieure (13a) contre le siège d'étanchéité conique du piston à ressort pneumatique de manière à sceller la chambre de travail, et le talon de fixation étant poussé axialement avec sa face inférieure (14a) qui pointe vers le piston à ressort pneumatique sur la zone d'épaulement du piston à ressort pneumatique. Il est prévu selon l'invention qu'une attache d'épaulement de piston annulaire (16a) soit disposée sur la zone d'épaulement du piston à ressort pneumatique, que la fixation d'épaulement de piston présente un côté intérieur radial (19a) directement ou indirectement contre le côté extérieur radial (15a) du talon de fixation du soufflet de ressort pneumatique, et que l'attache d'épaulement de piston présente un côté extérieur radial (18a) qui, au moins dans la zone de son plus grand diamètre extérieur, est adjacent à un contour extérieur radial (12a) du piston à ressort pneumatique de manière à affleurer radialement.
EP21798560.5A 2020-10-29 2021-10-12 Ressort pneumatique Pending EP4237700A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020213658.0A DE102020213658A1 (de) 2020-10-29 2020-10-29 Luftfeder
PCT/DE2021/200151 WO2022089694A1 (fr) 2020-10-29 2021-10-12 Ressort pneumatique

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EP4237700A1 true EP4237700A1 (fr) 2023-09-06

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EP (1) EP4237700A1 (fr)
CN (1) CN220581575U (fr)
DE (1) DE102020213658A1 (fr)
WO (1) WO2022089694A1 (fr)

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KR102678452B1 (ko) * 2022-11-15 2024-06-25 정철성 대형버스용 보조 에어서스펜션

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Publication number Priority date Publication date Assignee Title
US4787606A (en) * 1987-06-17 1988-11-29 The Firestone Tire & Rubber Company Beadless air spring
DE4230249C2 (de) 1992-09-10 1995-11-23 Continental Ag Luftfeder für Fahrzeuge mit einem elastomeren Rollbalg und einem Abrollkolben
DE102004015602B4 (de) * 2004-03-30 2011-08-18 Continental Teves AG & Co. OHG, 60488 Luftfedereinrichtung
DE102004048828A1 (de) 2004-10-07 2006-04-20 Zf Friedrichshafen Ag Luftfeder mit einem Kugelgelenk
US7325794B2 (en) * 2005-06-06 2008-02-05 Bfs Diversified Products, Llc Air spring assembly and method
DE102008004392A1 (de) * 2008-01-14 2009-07-16 Continental Aktiengesellschaft Klemmringsatz
DE102008055511A1 (de) 2008-12-11 2010-06-17 Contitech Luftfedersysteme Gmbh Luftfeder und Verfahren zur Montage
DE102008055512A1 (de) 2008-12-11 2010-06-17 Contitech Luftfedersysteme Gmbh Luftfeder
DE102010036972A1 (de) 2010-08-13 2012-02-16 Contitech Luftfedersysteme Gmbh Abzugssicherung für Luftfederbalg
JP2012117637A (ja) * 2010-12-02 2012-06-21 Toyo Tire & Rubber Co Ltd 空気ばね
DE102012100753A1 (de) 2012-01-31 2013-08-01 Contitech Luftfedersysteme Gmbh Abrollkolben mit Abzugsicherung
DE102012104964A1 (de) 2012-06-08 2013-12-12 Contitech Luftfedersysteme Gmbh Abrollkolben für einen Luftfederrollbalg
PL2690306T3 (pl) 2012-07-25 2016-03-31 Vibracoustic Cv Air Springs Gmbh Amortyzator pneumatyczny
US11077733B2 (en) * 2018-11-26 2021-08-03 Continental Automotive Systems, Inc. Dynamic load transfer by switchable air volume suspension

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WO2022089694A1 (fr) 2022-05-05
US20230392663A1 (en) 2023-12-07
DE102020213658A1 (de) 2022-05-05
CN220581575U (zh) 2024-03-12

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