DE102016216911A1 - Air suspension unit with large-volume air spring cover - Google Patents

Abstract

Air suspension unit (1) for a chassis of a motor vehicle comprising an air spring cover (2) and an air spring piston (6), wherein between the air spring cover (2) and the air spring piston (6) an airtight mounted bellows (11) made of elastomeric material partially filled with compressed air Working space (17) limited, wherein the rolling bellows (11) by a connecting element (7) is indirectly attached to the air spring cover (2), wherein the air spring cover (2) has a connection means (40) for the connecting element (7), wherein the connecting element (7) on the connection means (40), characterized in that the connection means (40) is provided in the interior of the air spring cover (2), wherein the diameter of the connection means (40) is smaller than the outer diameter of the air spring cover (2).

Description

The invention relates to an air spring unit according to the preamble of claim 1.

An air suspension unit, as for example from the DE 198 34 092 A1 is known, is arranged between the motor vehicle chassis or a wheel carrier and the vehicle body. As a rule, the air suspension unit comprises an air spring and a shock absorber. The air spring fulfills the function to cushion the wheel, while the shock absorber dampens the vibrations of the wheel or the vehicle body.

The air spring consists essentially of an air spring cover, an air spring piston and a rolling bellows clamped between them, by means of which a working space under atmospheric pressure is partially limited. The rolling bellows is enclosed by a sleeve-shaped outer guide and rolls off during compression to form a rolling fold on the concentric air spring piston. About the air spring cover the air spring unit is connected by means of appropriate fasteners to the vehicle body.

In order to allow a pleasant ride comfort, the air spring detection of the air spring must be adjusted accordingly. For example, the air spring detection can be determined by the effective working volume of the air spring and the contour of the rolling piston. For a soft air spring detection, for example, large-volume lid are used, the lid space and the working space form the effective spring volume. So the cover with extra volume consists of the DE 102 57 009 A1 for example, of two components, wherein the upper lid part is connected to the body and the lower lid part forms a large-volume lid space by its shape.

Below the lid, the clamping base is provided for connecting the rolling bellows. The Rollbalgbefestigung or the process step of jamming the rolling bellows by means of appropriate clamping means, which are coming from the outside and therefore always mounted below the lid. The disadvantage of such air spring cover require a lot of space in a very cramped wheel well. The usual attachment of the bellows below the air spring cover also causes a large overall height of the air suspension unit.

An alternative clamping device is in the DE 10 2004 046 681 B3 shown, which allows the attachment of different rolling bellows. Due to different sizes of rolling bellows and air spring covers, a universal mounting option from a coupling adapter and a connection ring is proposed, wherein the rolling bellows end is connected to the coupling adapter and the coupling adapter is in turn firmly connected to the connection ring, which generates the attachment to the air spring cover. The clamping device therefore requires additional components, as well as several assembly steps and is additionally rigid.

The arranged within the air spring shock absorber is on the one hand connected to the wheel carrier and on the other hand attached or mounted on its damper rod with a damper bearing in the air spring cover, whereby the forces emanating from the wheel or vibrations are damped in the body. During compression of the vehicle wheel against the vehicle body, there is pivotal movements of the air spring together with the outer guide relative to the rolling piston. As a result, the lower roll fold of the air spring is pressed against the rolling piston, whereby a radial force is transmitted to the damper tube or the shock absorber. Even when cornering, direct lateral forces act on the shock absorber, which should be absorbed by the shock absorber bearing in the best possible way. On the shock absorber therefore act unwanted forces, which can lead to increased friction between damper rod and damper tube and as a result there is a higher wear and a faster failure of the shock absorber, and reduced ride comfort. In order to load the shock absorber less, it is necessary not to transmit the pivoting movements of the air spring on the rolling piston and to reduce the lateral forces.

In order to reduce the pivoting movements of the air spring, a gimbal bearing in the form of another roll fold on the air spring cover can be provided, as can be seen from the DE 101 11 242 C1 is known. In this case, the upper rolled fold / Kardanikfalte, at least over part of the spring travel of the air spring, with its axial end face against the underside of the air spring cover. The thus created gimbal bearing allows the air spring to pivot relative to the shock absorber, the roll fold opposes the only a small resistance.

When driving the rolling bellows is also inferior to a torsional motion due to the kinematic axis movements between the air spring cover and air spring piston. In the process, the rolling bellows, which is usually reinforced by reinforcements, threatens to be damaged. The air spring from the DE 10 2012 201 104 A1 Therefore, for example, has a folding system, which is provided below the air spring cover. This folding system is used for torsion compensation and is additional also effective as cardanic fold. This is supported by a hybrid bellows, which is strengthened by means of strength members to a cross-bellows and the other as axial bellows. In the roll-off area on the air spring piston, the fabric strength carriers run crosswise, whereby a robust rolling bellows section is realized. In order to reduce the torsional rigidity, the fabric strength carriers in the region of the fold system are aligned parallel to the longitudinal axis of the air spring unit. The soft Rollbalgabschnitt can thereby compensate for torsional movements.

The object of the invention is to provide an air spring unit with a large-volume air spring cover and the smallest possible overall height.

The problem underlying the invention is achieved with the features of the independent claim.

According to the invention, an air spring unit for a chassis of a motor vehicle is provided, which comprises an air spring cover and an air spring piston, between the air spring cover and the air spring piston an air-tight rolling bellows made of elastomeric material partially bounded with a compressed air working space, the rolling bellows by a connecting element indirectly on the Air spring cover is fixed, wherein the air spring cover has a connection means for the connection element, wherein the connection element bears against the connection means, wherein the connection means is provided in the interior of the air spring cover, wherein the diameter of the connection means is smaller than the outer diameter of the air spring cover.

The rolling bellows is clamped to the annular and attachable connection element. Its counterpart, the connection means is provided in the interior of the air spring cover or extends into the interior of the air spring cover. This makes it possible to move the attachment of the rolling bellows in the interior of the lid and thus significantly reduce the overall height of the air spring unit, yet a large-volume air spring cover (for the purpose of comfort) is available. In this case, the connection means has a smaller diameter than the outer diameter of the air spring cover. At the same outer diameter of the air spring cover a variety of diameters for the connection means are possible.

Preferably, the connection means is designed as a folding contour. The step-shaped folding contour in the interior of the cover creates a universally usable connection possibility for the connecting element to which a wide variety of rolling-bellows diameters can be connected. In addition, the folding contour is easy to produce by bending thermoforming. In addition, extended design options for the air spring cover are available, since there is no need for a clamping base on the air spring cover.

According to a preferred embodiment, the air spring cover at least partially surrounds the connecting element in a hollow cylindrical shape. Complementing, in a further preferred embodiment, the air spring cover comprises a lid space, wherein the lid space at least partially surrounds the connecting element in a hollow cylindrical shape. Due to the fact that the air spring cover with its lid space partially extends over the connecting element, it is possible to use a comfortable air spring unit at a reduced overall height. Thus, a comfortable air suspension unit can be used even with a small available space.

According to a further preferred embodiment, the connecting element is secured by the internal pressure in the working space pressure-tight with the connection means. Preferably, a sealing ring is provided between the connection element and the connection means.

In the assembly process of the air spring unit, the rolling bellows is first clamped by means of a clamping ring to the connecting element. A sealing ring is already placed on the connecting element and the connecting element is then slipped onto the connecting means of the air spring cover from below. Via an air connection on the air spring cover, compressed air is led into the lid space and further into the working dream. In the operating state, the internal pressure in the working space then acts on the connection element and presses it against the connection element. Characterized in that the upper roll fold of the rolling bellows has a smaller effective pressure diameter than the lower roll fold, the upper roll fold is always formed, whereby the connection element is pressure-tightly connected to the air spring cover. This also means that the connecting element is advantageous as a standardized component for a variety of Rollbalgbefestigungen because it can be designed without great effort to different Rollbalgdurchmesser.

According to a further preferred embodiment, the connecting element forms on its side facing the air spring cover an axial annular web and on its outer side a radial annular web. Preferably, the connection element is located with the axial annular web on an axial folding surface of the connection means and with the radial annular web on a radial rebate surface of the connection means. The axial and radial bearing provides an advantageous and secure positioning of the connection element on the connection means.

The shape or rolling contour of the radial annular web for the upper rolling fold of the rolling bellows on Luftfederdeckelt determined to a spring behavior and the mode of action as a cardanic bearing, on the other hand, the compression of the connecting element reinforced on the air spring cover by means of the upper roll fold on.

According to a further preferred embodiment, a support structure is provided on the inside of the connection element, which is supported on a bearing receptacle of the air spring cover. To increase the strength of the clamping connection, the connecting element forms an inside support structure in the form of a rib or nub structure, which is supported on the bearing receptacle for the damper bearing and thus passes on effective forces. The ribbed or knobbed structure also allows compressed air to flow between the lid space and the working space. In addition, this is preferably supported by the fact that a reinforcing ring is introduced in the connecting element.

According to a further preferred embodiment, the connection element is rotatably attached to the connection means. Contrary to the usual attachment of a rolling bellows by means of clamping ring or vulcanization, the rolling bellows is rotatably mounted on the air spring cover. This connection leads to an extremely advantageous torsional compensation in the rolling bellows. During compression of the air suspension unit, the rolling bellows twists only very slightly in itself. The embedded in the rolling bellows strength carriers are therefore only slightly loaded on train / pressure. Thus, the rolling bellows obtains a prolonged life.

According to a further preferred embodiment, a sliding disk is arranged between the connection element and the connection means. The sliding disk is preferably arranged between the radial annular web and the radial folded surface. The sliding washer enhances the turning property of the connecting element and thus increases the torsional compensation.

In order to increase the driving comfort can preferably also be an elastomeric washer, for example made Cellasto ^®, are provided between the connection element and the connection means.

For an improved lateral rigidity and a more effective torsion absorption of the air suspension unit, a split outer guide is proposed. According to a further preferred embodiment, a first outer guide part and a second outer guide part enclose the rolling bellows like a sleeve. During compression or pivoting of the air spring according to the prior art, the lower roll fold is pressed by a one-piece outer guide against the air spring piston, whereby an adverse force is exerted on this. The split outer guide significantly reduces the compression of the lower roll fold of the rolling bellows relative to the air spring piston. During compression, the two outer guide parts pivot at different angles to each other, whereby the lower roll fold is only slightly or not pressed against the air spring piston. An interrupted in more than two parts outer guide may preferably be provided.

Preferably, the rolling bellows forms a torsion fold between the first and the second outer guide part. Particularly preferably, the torsion fold is formed with an axial bellows. Thus, an advantageous Torsionspunkt is created in the central region of the air spring, which allows an advantageous Torsionsaufnahme upon rotation of the air spring to the Längsache due to the embedded axial strength element. At the same time, the torsion fold is effective as a cardanic bearing.

Preferably, the torsion fold can be constricted by means of a ring to form a fold system, which further improves the mode of action as a cardanic bearing. The ring can be arranged outside of the bellows or vulcanized in the bellows.

According to a further preferred embodiment, the air suspension unit comprises an integrated shock absorber, wherein a damper bearing of the shock absorber is substantially at the same height with the rolling fold of the bellows on the air spring cover. Advantageously, moreover, the upper roll fold of the rolling bellows is at the same height with the damper bearing. Functionally lie thus the gimbal bearing and the pivot point of the shock absorber at the same height. As a result, a positive bearing assembly is created, which improves the transverse stiffness of the entire air suspension unit. The interaction of the gimbal bearing with the pivot point of the damper bearing causes an advantageous capacity for lateral forces, whereby the shock absorber is less stressed. Even when pivoting the air spring, the lower roll fold of the bellows is pressed slightly against the air spring piston, whereby a lower force acts on shock absorbers.

Use finds the air suspension unit in a chassis, preferably in an air spring system, for a motor vehicle.

Further preferred embodiments of the invention will become apparent from the subclaims and the following description of exemplary embodiments with reference to the figures.

Show it

1 a first exemplary air spring unit and

2 a second exemplary air suspension unit.

The 1 shows a first example according to the air suspension unit 1 which is an air spring 10 and an integrated shock absorber 30 includes. Air suspension unit 1 on the one hand by means of air spring cover 2 on a motor vehicle body and on the other hand by means of shock absorbers 30 be attached to a wheel of the vehicle chassis, whereby the vehicle is sprung and damped.

air spring 10 includes a rolling bellows 11 made of elastomeric material, with rolling bellows 11 with air spring cover 2 and an air spring piston 6 at least partially an airtight and filled with compressed air working space 17 limited. bellows 11 is at its axial lower end by means of a first clamping ring 18 with air spring piston 6 and at its axial upper end via a connecting element 7 indirectly with air spring cover 2 pressure-tight connected.

For relative movements in the axial direction of the air suspension unit 1 between air spring cover 2 and air spring piston 6 rolls rolling bellows 11 under formation of a first rolled fold 15 on the rolling surface of the concentric air spring piston 6 from. In addition, rolling bellows forms 11 a second rolled fold 16 on the air spring cover 2 out, which acts as a cardanic bearing. Advantageously, second roll fold allows 16 a better length utilization of the spring travel, as it rolls with. In addition to the effect as a gimbal camp, second roll fold serves 16 also for torsion absorption during rotation of the air spring 10 ,

Both rolled pleats 15 . 16 have an effective pressure diameter, wherein a first pressure diameter D1 of the first roll fold 15 greater than a second pressure diameter D2 of the second roll fold 16 , This ensures that second rolled fold 16 at least part of the spring travel of the air spring on the air spring cover 2 is present and above all trained. The different effective pressure diameters D1 and D2 are achieved in that the attachments (cover and piston) have different diameters.

There is also air spring cover 2 designed in several parts, with a first cover part 3 by means of appropriate fasteners 38 is connected to the vehicle body and a second cover part 4 as a volume-forming component together with the first cover part 3 a lid space 5 of the air spring cover 2 defines, with lid space 5 the determination of a comfortable air spring detection is used. First and second cover part 3 . 4 can be made of a metallic material and welded together. A metal-plastic combination is also conceivable.

Air spring cover 2 and lid space 5 are designed substantially hollow cylindrical, wherein centrally in the air spring cover 2 a stock record 44 for a shock mount 33 of the shock absorber 30 is provided. Here is the hollow cylindrical shape of the air spring cover 2 or the lid space 5 asymmetric, ie the center of the bearing support 44 offset, trained. In Stockaufname 44 is above the damper bearing 33 a pressure-tight cap 36 provided, which via an air connection 37 for filling the air spring 10 equipped with compressed air. The compressed air flows along damper bearings 33 in lid space 5 and continue in work dream 17 and fulfills the spring function.

For example, attachment of the bellows 11 on air spring cover 2 has second cover part 4 an internal step-shaped folding contour 40 on. The diameter of the fold contour is 40 smaller than the outer diameter of the second lid part 4 or the air spring cover 2 , Falzkontur 40 forms from a lower outer contour 49 the second lid part 4 inward and the step shape is by a first axial folding surface 41 , a radial folding surface 42 and a second axial folding surface 43 educated. Falzkontur 40 ends without stop inside the air spring cover 2 so that there is a free space between folding contour 40 and bearing reception 44 exists over which lid space 5 with working space 17 connected is. By folding contour 40 is therefore a universally applicable connection option of an air spring cover 2 for a rolling bellows 11 created. This is due to a clamping ground on the air spring cover 2 dispensed, resulting in extended design options of the air spring cover 2 result.

By means of the annular and attachable connection element 7 becomes rolling bellows 11 indirectly on air spring cover 2 rotatably connected. connecting element 7 can be made of a metallic material or plastic and has a clamping base 48 for mounting the rolling bellows 11 with its axial upper end via a second clamping ring 19 on. Parallel to the clamping base 48 is inside a reinforcing ring 8th in the connection element 7 introduced, which enhances the clamping action. On its underside forms connecting element 7 a torus 47 off, which ensures extended grip of the terminal group.

At the top forms connection element 7 an axial ring land 45 and on the outside a radial annular web 46 out. By means of axial ring web 45 and radial ring land 46 the connection is made to the air spring cover 2 or at folding contour 40 , This is axial ring web 45 at the second axial folding surface 43 and radial ring land 46 lies on radial folding surface 42 at. Due to the axial and radial bearing is an advantageous and secure positioning of the connection element 7 on the air spring cover 2 given. This also has the advantage that connection element 7 rotatable at folding contour 40 is stored, whereby a torsional compensation of the air spring 10 is possible. In addition, between radial ring land 46 and radial folding surface 42 a sliding washer 51 provided, which increases the torsional compensation.

Due to the internal pressure of the air spring 10 in the work dream 17 becomes connection element 7 pressure-tight at rabbet contour 40 pressed, which is made possible by the different pressure diameters D1, D2. Furthermore serves radial annular web 46 as rolling surface for second rolled fold 16 which the pressing of the connecting element 7 on air spring cover 2 further supported. In order to ensure a further pressure tightness is between the axial annular web 45 and second axial fold surface 43 arranged a sealing ring. The shape of the radial ring land 46 Can different rolling contours for the second roll fold 16 realize the spring behavior or the effect as a gimbal bearing.

To increase the strength of the connection element 7 is inside a rib-shaped support structure 50 provided which radially on the outside of the bearing receptacle 44 is applied. The ribbed or knobbed structure allows compressed air between the lid space 5 and workspace 17 can overflow.

Advantageously, there is currently second roll fold 16 at the same height with shock absorber bearings 33 , Functionally lie thus the gimbal bearing and a pivot point DP of the shock absorber 30 at the same height. As a result, an advantageous storage composite is created, which the transverse stiffness of the entire air spring unit 1 improved. The interaction of the gimbal bearing with pivot point DP causes an advantageous absorption of the transverse forces, whereby the shock absorber 30 less burden. Also when pivoting the air spring 10 becomes first rolled fold 15 slight against air spring piston 6 pressed, resulting in less force on shock absorbers 30 acts.

Furthermore, the exemplary mounting of the rolling bellows 11 via connection element 7 on air spring cover 2 the overall height of the air suspension unit 1 reduced, but still a large volume air spring cover 2 is available. Air spring cover 2 and thus also lid space 5 surround at least partially hollow cylindrical connecting element 7 and also rolled fold 16 , The reduced height allows a comfortable air suspension unit 1 to use even with small available space and thus expands its application.

The pressure-tight connection of the rolling bellows 11 by means of connecting element 7 on air spring cover 2 takes place as already mentioned by the internal pressure in the working space 17 the air spring 2 , In the assembly process of the air suspension unit 1 becomes rolling bellows 11 first by means of second clamping ring 19 to connection element 7 tethered. To connection element 7 is already a sealing ring 9 placed and connecting element 7 is then coming from below on rabbet contour 40 of the air spring cover 2 attached. Via air connection 37 is compressed air in the lid space 5 and work dream 17 directed. In the operating state, the internal pressure then acts in the working space 17 on connection element 7 and press this against folding contour 40 , This is rolling bellows 11 pressure-tight with air spring cover 2 connected. This also means that connecting element 7 As a standardized component for a variety Balgbefestigungen is advantageous because it can be configured with little effort in terms of different bellows diameter. The combination of folding contour 40 and connecting element 7 creates a universal plug-on system for rolling bellows attachment.

bellows 11 is in addition of a sleeve-shaped outer guide 21 enclosed, which by means of an inner clamping ring 24 on the bellows 11 is attached. external guide 21 but also on rolling bellows 11 be glued. First roll fold 15 thus rolls on the inside in the lower part of the outer guide 21 from. Depending on the application, rolling bellows 11 strengthened with reinforcements and can be designed as a cross-layer bellows (60 ° -70 ° alignment of the strength member) or as Axialbalg (90 ° alignment of the strength member). The cross-layer bellows, developed for optimum axial spring properties, in conjunction with the gimbal bearing assembly (second roll fold plus damper bearing) leads to a reduction in the transverse force influence. Also second roll fold 16 is by outside guide 21 partially enclosed, with second rolled fold 16 on the inside in the upper area of the outer guide 21 rolls. Thus, the upper end of the outer guide lies 21 also inside the air spring cover 2 ,

In air spring piston 6 is shock absorber 30 integrated, with air spring piston 6 hollow cylindrical a damper tube 31 surrounds the shock absorber and by means of support ring 35 attached to this. Furthermore includes shock absorber 30 a damper rod 32 and is over damper bearings 33 in camp recording 44 of the air spring cover 2 stored. At the air spring cover 2 abutting is an additional spring 34 below the damper bearing 33 and in the workroom 17 the air spring 10 arranged, with additional spring 33 hollow cylindrical the damper rod 32 surrounds and as a stop buffer for damper tube 31 serves.

To protect the second rolled fold 16 is a protective bellows 39 on the second cover part 4 and on the outside guide 21 attached.

2 shows a second exemplary air spring unit 1 , which regards the attachment of the rolling bellows 11 via connection element 7 on the air spring cover 2 essentially the air suspension unit 1 corresponds and differs mainly by the design of the outer guide and the rolling bellows 11 as a hybrid bellows.

The outer guide is as a separate two-piece outer guide with a first lower outer guide part 22 and a second upper outer guide part 23 executed. A segmented in more than two parts outer guide is also conceivable. First outdoor guide part 22 encloses first rolled fold 15 and is in the area of the air spring piston 6 arranged, while enclosing the second outer guide part 23 second rolled fold 16 and is in the range of the air spring cover 2 arranged. First outdoor guide part 22 is by means of a first inner clamping ring 25 and second outer guide part 23 is by means of a second inner clamping ring 26 on the bellows 11 attached. Both outdoor guide parts 22 . 23 can also be used with rolling bellows 11 be glued. External guidance parts 22 . 23 are preferably made of aluminum or a steel, but can also be made of a plastic.

At the same time is rolling bellows 11 designed as a hybrid bellows. So is first roll fold 15 and a lower part of the rolling bellows 11 in the area of the first outer guide part 22 as Kreuzlagenbalg 12 while there is second roll fold 16 and an upper part of the rolling bellows 11 in the region of the second outer guide part 23 as axial bellows 13 executed. In the upper end of the first outer guide part 22 or in the clamping area by means of the first inner clamping ring 25 lies an overlap area 14 from Kreuzlagenbalg 12 to axial bellows 13 of the rolling bellows 11 in front.

bellows 11 can also be designed as an extended hybrid bellows. Here is the first rolled fold 15 and a lower part of the rolling bellows 11 in the area of the first outer guide part 22 as Kreuzlagenbalg 12 executed, and also is second roll fold 16 and an upper part of the rolling bellows 11 in the region of the second outer guide part 23 executed as cross-layer bellows. Only torsion fold 20 is designed as Axialbalg. In the clamping areas by means of inner clamping rings 25 . 26 Accordingly, the overlapping areas of cross-layer bellows to Axialbalg provided. Advantageously, a soft Axialbalg is thus used for Torsionspunkt TP with effective torsion and improved gimbal deflection, the remaining rolling bellows 11 designed as a robust cross-layer bellows.

In the exposed area between the two outer guide parts 22 . 23 forms rolling bellows 11 a torsion fold 20 out, with torsion fold 20 as axial bellows 13 is executed. Thus, in the middle region of the air spring 10 an advantageous torsion point TP created, which due to the embedded axial strength member an effective torsion absorption during rotational movements of the air spring 10 allows.

Advantageously, torsion fold acts 20 also as a cardanic camp. When pivoting the air spring, the lower roll fold is pressed against the air spring piston according to the prior art, whereby a force is exerted on the shock absorber. The exemplary shared outer guide reduces the compression of the first roll fold 15 against air spring piston 6 essential. When springing both outer guide parts pivot 22 . 23 at different angles to each other, creating first roll fold 15 only slightly or not at all against air spring piston 6 is pressed and thus no adverse lateral forces on shock absorbers 30 act.

LIST OF REFERENCE NUMBERS

1

 Air suspension unit

2

 Air spring cover

3

 first cover part

4

 second cover part

5

 cover space

6

 Air spring piston

7

 connecting element

8th

 reinforcement ring

9

 seal

10

 air spring

11

 bellows

12

 Kreuzlagenbalg

13

 axial bellows

14

 overlap area

15

 first rolled fold

16

 second roll fold / fold

17

 working space

18

 first clamping ring

19

 second clamping ring

20

 Torsionsfalte

21

 external guide

22

 first outer guide part

23

 second outer guide part

24

 Internal clamping ring

25

 first inner clamping ring

26

 second inner clamping ring

30

 shock absorber

31

 damper tube

32

 damper rod

33

 top mounts

34

 additional spring

35

 support ring

36

 cap

37

 air connection

38

 fastener

39

 bellows

40

 Falzkontur

41

 first axial folding surface

42

 radial rebate surface

43

 second axial folding surface

44

 bearing seat

45

 axial ring web

46

 radial ring web

47

 torus

48

 clamp base

49

 outer contour

50

 support structure

51

 sliding disk

D1

 first pressure diameter

D2

 second pressure diameter

DP

 pivot point

TP

 Torsionspunkt

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 19834092 A1 [0002]
• DE 10257009 A1 [0004]
• DE 102004046681 B3 [0006]
• DE 10111242 C1 [0008]
• DE 102012201104 A1 [0009]

Claims (16)

Air suspension unit ( 1 ) for a chassis of a motor vehicle comprising an air spring cover ( 2 ) and an air spring piston ( 6 ), wherein between the air spring cover ( 2 ) and the air spring piston ( 6 ) an air-tight attached bellows ( 11 ) of elastomeric material partially filled with compressed air working space ( 17 ), wherein the rolling bellows ( 11 ) by a connecting element ( 7 ) indirectly on the air spring cover ( 2 ), wherein the air spring cover ( 2 ) a connection means ( 40 ) for the connection element ( 7 ), wherein the connecting element ( 7 ) at the connection means ( 40 ), characterized in that the connection means ( 40 ) inside the air spring cover ( 2 ) is provided, wherein the diameter of the connection means ( 40 ) is smaller than the outer diameter of the air spring cover ( 2 ). Air suspension unit ( 1 ) according to claim 1, characterized in that the connection means as folding contour ( 40 ) is executed. Air suspension unit ( 1 ) according to claim 1 or 2, characterized in that the air spring cover ( 2 ) at least partially the connection element ( 7 ) surrounds a hollow cylinder. Air suspension unit ( 1 ) according to one of claims 1 to 3, characterized in that the air spring cover ( 2 ) a lid space ( 5 ), wherein the lid space ( 5 ) at least partially the connection element ( 7 ) surrounds a hollow cylinder. Air suspension unit ( 1 ) according to one of claims 1 to 4, characterized in that the connecting element ( 7 ) by the internal pressure in the working space ( 17 ) pressure-tight with the connection means ( 40 ) is attached. Air suspension unit ( 1 ) according to any one of claims 1 to 5, characterized in that the connecting element ( 7 ) on its upper side an axial annular web ( 45 ) and on its outside a radial annular web ( 46 ) trains. Air suspension unit ( 1 ) according to claim 6, characterized in that the connecting element ( 7 ) with the axial annular web ( 45 ) at an axial folding surface ( 43 ) of the connection means ( 40 ) and with the radial annular web ( 46 ) at a radial folding surface ( 42 ) of the connection means ( 40 ) is present. Air suspension unit ( 1 ) according to claim 6 or 7, characterized in that the radial annular web ( 46 ) a rolling surface for a rolled fold ( 16 ) of the rolling bellows ( 11 ). Air suspension unit ( 1 ) according to one of claims 1 to 8, characterized in that on the inside of the connecting element ( 7 ) a support structure ( 50 ) is provided, which at a bearing receptacle ( 44 ) of the air spring cover ( 2 ) is supported. Air suspension unit ( 1 ) according to one of claims 1 to 9, characterized in that the connecting element ( 7 ) rotatable on the connection means ( 40 ) is present. Air suspension unit ( 1 ) according to one of claims 1 to 10, characterized in that between the connection element ( 7 ) and the connection means ( 40 ) a sliding disk is arranged. Air suspension unit ( 1 ) according to one of claims 1 to 11, characterized in that a first outer guide part ( 22 ) and a second outer guide part ( 23 ) the rolling bellows ( 11 ) surround sleeve-shaped. Air suspension unit ( 1 ) according to claim 12, characterized in that the rolling bellows ( 11 ) between the first and the second outer guide part ( 22 . 23 ) a torsion fold ( 20 ) trains. Air suspension unit ( 1 ) according to claim 13, characterized in that the torsion fold ( 20 ) with an axial bellows ( 13 ) is executed. Air suspension unit ( 1 ) according to one of claims 1 to 14, characterized in that the air suspension unit ( 1 ) an integrated shock absorber ( 30 ), wherein a damper bearing ( 33 ) of the shock absorber ( 30 ) substantially at the same height as the roll fold ( 16 ) of the bellows ( 11 ) on the air spring cover ( 2 ) lies. Suspension for a motor vehicle, in particular an air suspension system, with an air suspension unit ( 1 ) according to one of claims 1 to 15.

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