DE102011053948A1 - Air spring arrangement for automotive- and machine construction, has air spring bellow formed of polymeric material with elastic properties, where air spring bellow includes volume elastic air chamber - Google Patents

Abstract

The air spring arrangement (10) has an air spring bellow (11) formed of polymeric material. The air spring bellow includes a volume elastic air chamber. A cover is provided with an attachment area, to which one end of the air spring bellow is fastened by a clamping ring. A rolling piston (13) is provided with another attachment area. The rolling piston has a lateral contact surface (14) on which the air spring bellow rolls to form a loop (12). The rolling piston is formed as double-walled chamber which contains a phase-change material that liquefies when heated to the melting temperature.

Description

• – einem Luftfederbalg aus einem polymeren Werkstoff mit elastischen Eigenschaften, der eine volumenelastische Luftkammer einschließt;
• – einem Deckel mit einem ersten Befestigungsbereich, an dem das eine Ende des Luftfederbalges mittels eines Klemmringes oder dergleichen befestigt ist; sowie
• – einem Abrollkolben mit einem zweiten Befestigungsbereich, an dem das andere Ende des Luftfederbalges ebenfalls mittels eines Klemmringes oder dergleichen befestigt ist, und mit einer seitlichen Kontaktfläche, an dem der Luftfederbalg unter Bildung einer Schlaufe abrollen kann.

The invention relates to an air spring arrangement for vehicle and machine construction, comprising at least the following components:

• - An air spring bellows made of a polymeric material having elastic properties, which includes a volume-elastic air chamber;
• A lid having a first attachment portion to which one end of the air spring bellows is fixed by means of a clamping ring or the like; such as
• - A rolling piston with a second mounting portion to which the other end of the air spring bellows is also secured by means of a clamping ring or the like, and with a lateral contact surface on which the air bag can roll to form a loop.

The polymeric material of the air spring bellows is usually an elastomer or a thermoplastic elastomer, as this elastic properties are associated. Of particular importance are elastomers formed from a vulcanized rubber compound. The rubber base is in particular EPM, EPDM, SBR, BR, CR, NR, NBR, HNBR, FKM, ACM, AEM or silicone rubber (MQ, VMQ, PVMQ, FVMQ; DE 10 2006 058 470 A1 ). With regard to details of such rubber mixtures, reference is made to the published patent application DE 10 2009 044 533 A1 directed.

The air spring bellows comprises an inner layer and outer layer, wherein between the inner layer and outer layer in particular a single or multi-layer strength support layer is embedded from a textile material. Of importance are Kreuzlagenbälge and Axialbälge.

The textile material for the reinforcement layer is a polyamide (PA), polyimide (PI), an aramid, in particular para-aramid or meta-aramid, a polyvinyl acetal (PVA), polyvinyl alcohol (PVAL), cotton (CO), modal (CMD) , Rayon (CV), a polyetheretherketone (PEEK), a polyester, especially polyethylene terephthalate (PET) or polyethylene-2,6-naphthalate (PEN), a polysulfone (PSU), a polyoxadiazole (POD), a polybenzoxazole (PBO), a polyphenylene or a polyphenylene derivative, especially polyphenylene sulfide (PPS). Hybrid concepts, for example in the form of a Mischzwirns, can be used. As part of a recent development ( DE 10 2008 037 417 A1 ), for example, a hybrid concept of PPS and PA is used. The PPS as a high performance material contributes to a high strength, while the PA contributes in addition to the strength carrier contribution to improved adhesion to the surrounding polymeric material.

Other components of an air spring assembly may be, for example, an outer guide, a protective sleeve, a bearing and a damper unit (shock absorber). In addition, the lid may be formed as a pressure vessel. With regard to the prior art of air spring arrangements, reference is made, for example, to the following patent documents: DE 195 08 980 C1 DE 10 2009 044 533 A1 DE 100 01 018 A1 DE 201 22 095 U1 DE 101 03 493 A1 EP 1 031 756 A2 DE 102 20 528 A1 EP 1 144 210 A2 DE 103 30 198 A1 WO 01/65138 A1

Articles made of elastomeric materials age particularly strongly under the influence of heat. Thus, the life of elastomeric articles, in which the air bellows are to be emphasized, exponentially decreases with the ambient temperature. Both the entry of ambient heat and internal losses of the air spring bellows increase the operating temperature.

On the other hand, even extremely low temperatures damage the bellows wall when the elastomer comes close to its glass transition point.

In addition, because of its relatively high thermal resistance of the rolling piston of the air spring assembly only a little heat off and can supply.

The object of the invention is therefore to provide an air spring assembly to break with the occurring in the loop of the air spring bellows temperature peaks and the operating temperature to be uniform, but at least temporarily.

This object is achieved in that the rolling piston is double-walled to form a chamber, wherein the chamber contains a PCM material which liquefies when heated to the melting temperature, while absorbing amounts of heat without the temperature rises, with training a latent heat storage, which releases its heat when the outside temperature drops below the temperature of the PCM material, the latent heat storage keeps its temperature constant until the PCM material is completely solidified.

The term "PCM material" is derived from "phase change material". The PCM material is able to absorb large amounts of heat (about 200 kJ / kg) without the temperature rising. Only when the PCM material has completely melted, the temperature of the melt continues to rise.

• – Das PCM-Material weist einen Schmelzpunkt von 25°C bis 100°C auf und lässt sich dabei über die Länge seiner Molekülketten innerhalb des obigen Bereiches in weiten Grenzen einstellen.
• – Das PCM-Material ist ein Paraffinwachs, das insbesondere hoch rein ist.

With regard to the ACM material, the following material criteria are advantageous:

• - The PCM material has a melting point of 25 ° C to 100 ° C and can be adjusted over the length of its molecular chains within the above range within wide limits.
• - The PCM material is a paraffin wax, which is particularly high purity.

The invention will now be explained by means of exemplary embodiments with reference to schematic drawings. Show it:

1a an air spring assembly;

1b the layer structure of an air spring bellows;

2 an air spring assembly with double-walled rolling piston to form a chamber containing a PCM material.

1a shows an air spring assembly 1 comprising an air spring bellows 2 as well as the two connection components cover 3 with a first attachment area A and a rolling piston 4 with a second fastening region B for the air spring bellows, with the formation of a volume-elastic air chamber 5 ,

1b now shows the layer structure of a bellows 2 , The air spring bellows consists of an inner layer 6 and outer layer 7 as an elastic basic body, for example from a vulcanized rubber mixture based on EPDM, as well as between the inner layer 6 and outer layer 7 embedded strength layer 8th , For example in the form of a polyamide fabric. The air bag can additionally with a coating 9 Be provided with the outer layer 8th is in direct connection. The coating may have, for example, reflective properties ( DE 10 2009 044 533 A1 ) or a care product in the form of a thin film ( DE 10 2010 037 842.9 ).

2 now shows an air spring assembly 10 with an air bag 11 , The rolling piston 13 is double-walled, with the formation of a chamber 15 , in particular in the form of an annular chamber. This chamber 15 is filled with the PCM material. During operation of the air spring assembly 10 rolls the air bag 11 forming a loop 12 on the contact surface 14 of the rolling piston 13 so that a dynamically variable portion of the bellows wall the outer wall of the rolling piston 13 touched. About the contact surface 14 flows a heat flow, which depends on the temperature difference between the unwinding partners. Is the rolling piston 13 colder than the bellows wall, it cools the bellows wall at the contact surface 14 , In the opposite case, the rolling piston heats up 13 the bellows wall. In both cases, the duration of effectiveness depends on the capacity of the latent heat accumulator and the heat transfer between the rolling piston 13 and the bellows wall off.

In the period of the storage time constant, the latent heat storage limits the height of the temperature peaks and makes the operating temperature at the contact surface even 14 between the rolling piston 13 and the bellows wall. Both at high (> 60 ° C) and very low (<-30 ° C) outside temperatures, the memory limits the extremes of the temperature around the loop 12 , This has a positive effect on the life of the air spring assembly.

The rolling piston 13 is formed of a metal, for example aluminum, or a heat-stable and mechanically and dynamically resilient plastic, which is in particular fiber-reinforced, for example glass fiber reinforced, is. Such a high-performance plastic, for example, a polyphenylene ether (PPE), which is also known under the trade name VESTORAN ^® Evonik Degussa AG.

The rolling piston 13 is with a chassis connection 16 Mistake.

LIST OF REFERENCE NUMBERS

1

Air spring arrangement

2

suspension bellows

3

cover

4

roll-off

5

volume-elastic air chamber

6

Inner layer of a bellows

7

Outer layer of a bellows

8th

Reinforcing layer of an air spring bellows

9

coating

10

 Air spring arrangement

11

 suspension bellows

12

 Loop (rolled fold)

13

 roll-off

14

 Contact surface of the loop

15

 chamber

16

 chassis connection

A

first mounting area of the air spring bellows

B

second mounting area of the air spring bellows

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006058470 A1 [0002]
• DE 102009044533 A1 [0002, 0005, 0018]
• DE 102008037417 A1 [0004]
• DE 19508980 C1 [0005]
• DE 10001018 A1 [0005]
• DE 20122095 U1 [0005]
• DE 10103493 A1 [0005]
• EP 1031756 A2 [0005]
• DE 10220528 A1 [0005]
• EP 1144210 A2 [0005]
• DE 10330198 A1 [0005]
• WO 01/65138 A1 [0005]
• DE 102010037842 [0018]

Claims (6)

Air spring arrangement ( 1 . 10 ) consisting at least of the following components: - an air spring bellows ( 2 . 11 ) made of a polymer material with elastic properties, which has a volume-elastic air chamber ( 5 ) includes; - a lid ( 3 ) with a first attachment area (A), at which one end of the air spring bellows ( 2 . 11 ) is fastened by means of a clamping ring or the like; and - a rolling piston ( 4 . 13 ) with a second attachment area (B), at which the other end of the air spring bellows ( 2 . 11 ) is also secured by means of a clamping ring or the like, and with a lateral contact surface ( 14 ), on which the air bag ( 2 . 11 ) forming a loop ( 12 ) can roll; characterized in that the rolling piston ( 4 . 13 ) double-walled to form a chamber ( 15 ), wherein the chamber contains a PCM material, which liquefies when heated to the melting temperature, while absorbing amounts of heat without the temperature rises, to form a latent heat storage, which releases its heat when the outside temperature is below the temperature of the PCM material decreases, the latent heat storage keeps its temperature constant until the PCM material is completely solidified. Air spring arrangement according to claim 1, characterized in that the PCM material has a melting point of 25 ° C to 100 ° C. Air spring arrangement according to claim 1 or 2, characterized in that the PCM material is a paraffin wax. Air spring arrangement according to one of claims 1 to 3, characterized in that the PCM material is a high-purity paraffin wax. Air spring arrangement according to one of claims 1 to 4, characterized in that the chamber ( 15 ) is designed as an annular chamber. Air spring arrangement according to one of claims 1 to 5, characterized in that the rolling piston ( 4 . 13 ) is formed of a metal or a heat-stable and mechanically and dynamically resilient plastic.

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