DE102015222333A1 - Spring arrangement for a motor vehicle - Google Patents

Abstract

The invention relates to a spring arrangement (1) for a motor vehicle, comprising a helical spring (2) extending along an extension axis (A) and a rubber-elastic spring pad (3, 5) for indirectly supporting the helical spring on a spring seat (11). In order to enable improved vibration damping at the transition between a spring and a spring seat, the invention provides that between the coil spring (2) and the spring pad (3) at least one intermediate element (4) is arranged, which rests on the one hand on the coil spring (2) and on the other hand in the no-load state with a radially extending first abutment region (4.4) against the spring pad (3).

Description

The invention relates to a spring arrangement for a motor vehicle having the features of the preamble of claim 1.

The suspension provides an essential element of the wheel suspension in motor vehicles. In a typical construction, a wheel carrier, which forms the receptacle for the actual vehicle wheel, is connected to the vehicle chassis via one or more links (eg, wishbone and trailing arm). The actual suspension can be ensured in many different ways. In any case, the spring is arranged so that results in a relative movement of the wheel carrier relative to the vehicle body, a restoring force. The vehicle body is part of the sprung mass, while the wheel carrier is part of the unsprung mass. In the prior art coil springs are often used, which are usually made of spring steel. Such a helical spring is usually supported on the one hand either on the wheel carrier itself or on a handlebar, and on the other hand on the vehicle body (ie the body or the chassis). The course of the spring may in this case be more or less vertical, but under certain circumstances, there may also be a clear inclination in the longitudinal or transverse direction of the vehicle.

The respective area in which the spring is supported (on the wheel or on the body side) is often referred to as a spring seat. It is known in the art, for example, to store the spring in spring plates, which serve to provide a sufficiently large and flat contact surface for the spring, wherein the edge of the spring plate is often formed like a flange and includes the end of the spring to a prevent lateral shifting. In this case, the spring is often not supported directly on a metal part (for example, the spring plate), but it is a spring pad interposed, which consists of an elastic material, for example. Rubber, and which serves to dampen vibrations. In particular, in vehicles in the premium sector, it is an essential quality feature that emanating from the chassis vibrations are not as possible or as far as possible passed on to the body. Here, the springs are a primary transmission path for noise or vibration. An effective damping of the vibrations at the transition between spring and spring seat, in particular from the spring to the vehicle body, is therefore under NVH aspects (noise, vibration, harshness) of central importance. However, despite the interposition of an elastic spring pad, known suspensions in the prior art can not satisfactorily damp such vibrations, at least in some frequency ranges.

The US 2010/0109428 A1 discloses a device for damping vibrations of a coil spring, wherein a retaining device partially surrounds the end turn of the coil spring. The retaining device may be formed in one or two parts and comprises an outside of the end turn arranged annular flange and a plurality of internally arranged elastic claws, which form a snap mechanism, which secures the Endwindung in position and thus prevents vibrations.

The US 2014/0265081 A1 discloses an elastic pad, for example made of rubber, which can be arranged between a spring seat and a coil spring and serves to protect the end of the spring from damage and contamination. The cushion comprises a seat portion, which is formed in a circular arc and is arranged axially in front of the spring, and two lateral wall portions which extend from the seat portion. In this case, at least one wall section has a circular-arc-shaped contact surface, with which it rests against the helical spring, as well as a sloping in the radial direction inclined surface, which is to allow sliding of dirt. In the relaxed state, the radius of the contact surface is smaller than the radius of the wire of the coil spring.

The US 2015/0096536 A1 shows a pulse damper which is connected to a fuel line to trap pulse pressure waves within it. The pulse damper includes a low-pressure coil spring and a high-pressure disc spring, which are arranged together with a spring guide shaft which can be reciprocated inside a spring body, and a low-pressure spring cover which is disposed between the low-pressure coil spring and the high-pressure disc spring, and a high-pressure spring plate. In this case, the spring guide shaft and the piston are integrally formed with each other, and the high-pressure spring plate is mounted at one end of the spring guide shaft. The low pressure spring cover and the high pressure spring plate form stops that prevent exceeding the elastic limit of the respective springs.

The DE 10 2013 009 637 A1 discloses a spring pad for a motor vehicle for placement between a coil spring and a spring plate. The spring pad comprises a base body made of elastic polymer and a spring-side arranged thereon sacrificial anode, which in turn is supported by a deposit of solid material, which is intended to prevent breakage of the sacrificial anode under mechanical loads. An embodiment shows a spring pad with an annular portion which is disposed between spring plate and coil spring, as well as a subsequent thereto cylindrical portion which rests on the inside of the spring.

The EP 2 172 352 B1 shows a spring pad for a suspension spring of a suspension. The spring pad in this case comprises a piezoelectric actuator which is embedded between an upper part and a lower part of the spring pad. The piezoelectric actuator can either be put under tension via corresponding connections in order to specifically compensate for vibrations acting on the part of the spring, or the electrical energy generated in the piezoelectric actuator during vibration can be fed into the electrical system of the vehicle.

The KR 2012/0061624 A shows a spring pad, which includes a circular ring-like portion and an inner adjoining cylinder portion. In the surface of the former portion, a helix is formed, which is intended to bear a coil spring. The cylinder portion has a central recess through which a mounted within the coil spring is guided shock absorber.

The KR 2013/0017156 A discloses a spring pad with a channel-shaped recess which is intended to bear the end of a coil spring. In order to ensure improved contact with the coil spring, the overall part-circular spring pad is formed like a helix, so that the recess has a profile along the direction of rotation rising.

The KR 2015/0054378 A shows a motor vehicle suspension in which a coil spring is supported on a spring seat via a spring pad. The spring pad has a plate-shaped base and a central elevation emanating therefrom, which is arranged within the coil spring. It is provided that securing clamps secure the position of an end turn of the coil spring on the spring pad. The fuse terminals ring-like the spring wire and are releasably attached to the spring pad.

In view of the cited prior art, the improvement in the damping of vibrations transmitted between a spring and a spring seat, in particular from a suspension spring to the vehicle body, still offers room for improvement.

The invention has for its object to provide an improved vibration damping at the transition between a spring and a spring seat.

According to the invention the object is achieved by a spring assembly with the features of claim 1, wherein the dependent claims relate to advantageous embodiments of the invention.

It should be noted that the features listed in the following description as well as measures in any technically meaningful way can be combined with each other and show other embodiments of the invention. The description additionally characterizes and specifies the invention, in particular in connection with the figures.

The invention provides a spring arrangement for a motor vehicle. As motor vehicles are especially cars or trucks in question. The spring arrangement has a coil spring extending along an extension axis and a rubber-elastic spring pad for indirectly supporting the coil spring on a spring seat. The helical spring can in this case consist in particular of spring steel, but possibly also of another material, for example fiber-reinforced plastic or a composite material. The extension axis in this case corresponds to the extension direction of the coil spring and may optionally coincide with an axis of symmetry or spring center line of the coil spring. However, the coil spring does not have to be symmetrical. The extension axis defines a coordinate system with axial, tangential and radial directions. It is envisaged that the coil spring in this case is primarily supported in the axial direction on the spring seat. The spring assembly is normally part of a suspension of the motor vehicle. Here, the spring connects an unsprung mass of the vehicle with a sprung mass of the vehicle. In any case, the areas on the sprung or unsprung components on which the spring is supported are referred to in this context as "spring seat". The term is otherwise not to be construed in this context as limiting the form thereof. Overall, therefore, in this sense, provide a spring seat for each end of the spring. This may, for example, be a spring plate.

It is provided here that the coil spring is not directly, but indirectly supported on such a spring seat, via the rubber-elastic spring pad. As will be explained below, this does not mean that the coil spring is in direct contact with the spring pad. However, at least the spring pad between the coil spring and the spring seat is interposed. The spring pad is elastic, d. H. it consists at least predominantly of rubber or a comparable material such as, for example, an elastomer, silicone rubber or the like.

According to the invention it is provided that between the coil spring and the spring pad at least one intermediate element is arranged, which rests on the one hand on the coil spring and on the other hand rests in the no-load state with a radially extending first abutment region on the spring pad. When using the spring arrangement as intended, it is provided that the helical spring is supported on the spring pad via the intermediate element, thus thus a force flow from the helical spring via the intermediate element to the spring pad (and from there to the spring seat) runs. In order to ensure this power flow, the intermediate element rests on the one hand on the coil spring and on the other hand on the spring pad. In this case, the first bearing area is provided opposite the spring pad, which extends radially. In other words, in contrast to a directly resting on the spring pad spring, which has a total linear bearing area and points selectively viewed in the radial direction, the intermediate element along the radial direction in a plurality of (possibly contiguous) points on the spring pad at. It is understood here that, for stability reasons, along the tangential direction, a plurality of points or a contiguous region must be provided, in which the at least one intermediate element bears against the spring pad.

In this case, there may be a single, contiguous first abutment region or else this may be subdivided or a plurality of first abutment regions may be provided. The statement that the intermediate element rests against the spring support with the first contact region here refers to a load-free state in which the spring arrangement is not under pressure, and the spring support is therefore not elastically deformed. Ie. in the unloaded state, the intermediate element bears against the spring support with the radially extending first contact region. This is achieved in that the at least one first abutment region has a shape that corresponds to the opposite surface of the spring pad, so to speak, is complementary to this. However, the contact area does not have to be an exact negative form of the opposing surface, but for example within the first contact area or between the first contact areas recesses may be provided where the surface of the intermediate element recedes relative to the spring base and thus (at least in a no-load state ) is not applied to this. It is understood that the intermediate element rests as a rule also in the loaded state, at least with the first contact region on the spring pad.

The invention is based on the finding that strong local pressure loads on the spring pad can greatly impair its damping properties. Thus, as usual in the prior art, the coil spring directly on the spring pad, so there is a line-shaped contact area in the unloaded state, which is limited in the radial direction to a point. That is, the compressive force exerted by the spring concentrates on a very small area, which in turn leads to high pressure and strong local deformation of the spring pad. In particular, the localized high pressure causes vibrations or sound (the two terms are treated as synonymous hereinafter) can not be effectively damped at least in certain frequency ranges. Also, a strong local pressure load can lead to premature fatigue of the spring pad. These disadvantages can be avoided according to the invention by radially distributing the force through the first abutment region, which leads to an effective pressure limitation. On the one hand, this improves the NVH properties of the spring arrangement and it can be used e.g. a transmission of vibrations generated by the chassis via the coil spring in the direction of a vehicle body on which the spring seat is formed can be effectively suppressed. This is apart from the design, apart from the pressure distribution, also supported by the mere interposition of the intermediate element, since, as is known, any boundary layer or each material transition obstructs the propagation of sound waves. Furthermore, the improved distribution of the pressure results in a lower local load on the spring pad, which has a positive effect on its service life. It should be noted that this lower load is not done at the expense of the intermediate element, since this is acted upon by the spring pad with a corresponding, based on the counter forces pressure distribution.

Particularly preferably, the spring pad is provided for support on a vehicle-side spring seat. Such a vehicle-side spring seat is formed on a vehicle body (body or chassis), while an opposite, wheel-side spring seat may be formed on a wheel or handlebar. The advantages of the invention are particularly noticeable on a vehicle-side spring seat, as it is crucial to reduce as far as possible the transmission of vibrations from the spring to the spring seat at this point in order to prevent them from being audible and / or noticeable to occupants become.

Preferably, the intermediate element bears against the helical spring with a radially extending second abutment region. It takes place here based on the cross section in the axial-radial plane no punctual loading of the intermediate element, but the load, so the force acting on the part of the coil spring force is distributed in the radial direction, resulting in a lower pressure. As a result, on the one hand, the service life of the intermediate element can be positively influenced. On the other hand, it is easier to distribute the force acting on the part of the helical spring on the surface of the first contact area, if already the force is introduced radially distributed in the intermediate element over the second contact area in the manner described. Otherwise, there would be a risk that a local loading of the intermediate element by the helical spring could lead to a (elastic or plastic) deformation of the intermediate element and a clearly inhomogeneous pressure distribution in the region of the first abutment section.

Preferably, the coil spring is physically isolated from the spring pad. This means that when properly assembled the spring assembly no direct physical contact between the coil spring and the spring pad exists. Thus, a direct transmission of vibrations from the coil spring to the spring pad is excluded. Ie. the coil spring is only in contact with the spring pad via the intermediate element. A vibration transmission could possibly take place via the intermediate element or else via the air, the latter being negligible under NVH aspects.

As already stated, essential ideas of the invention on the one hand, the interposition of another element between the coil spring and spring pad to generally hinder the sound transmission, and the distribution of the pressure acting on the spring pad. In particular, the latter can be realized well if the intermediate element has a greater rigidity than the spring pad. It is conceivable that the intermediate element consists at least partially of metal or ceramic. Preferably, the intermediate element consists at least partially or at least predominantly of plastic. Plastics, for example, thermoplastics, can be easily brought into any shape and contribute only slightly to weight and material costs. It is expressly possible in this context that the intermediate element has a composite structure and thus consists of several materials, of which only a part has the said greater rigidity. For example. a plastic could be reinforced by fibers, for example glass fibers, aramid fibers or carbon fibers. Since the transmission of sound between bodies with different stiffness is usually worse than between bodies with the same rigidity, an improvement is achieved in this regard, if the intermediate element is stiffer than the spring pad.

In principle, it is possible that the coil spring rests against the intermediate element and the relative position of the two is secured only by the spring tension and frictional forces. On the one hand to better secure the relative position during operation and on the other hand to facilitate the assembly of the spring assembly, it is preferred, however, that the intermediate element is secured to the coil spring. This can be realized in a variety of ways, by a variety of detachable or non-detachable connections. One possibility here would be a cohesive connection, for example by gluing. This may be advantageous in that the adhesive layer leads to the formation of a further boundary layer, which in turn hinders the transmission of sound and vibrations. On the other hand, it should be noted that an adhesive bond must withstand the static and dynamic loads in the connection area between the coil spring and the intermediate element, without prematurely fatigue.

Preferably, the intermediate element is positively and / or non-positively connected to the coil spring. It may be, for example, pushed onto the coil spring, plugged or clamped. It can be formed on the intermediate element elastic claws or the like, which surround a part of the coil spring and possibly in the attached state under tension, resulting in an increased static friction between the intermediate element and coil spring. In general, the intermediate element may be elastic and have a recess with an inner dimension which is slightly smaller than the corresponding outer dimension of the helical spring, so that when connecting the helical spring with the intermediate element an elastic deformation of the same takes place, which causes the intermediate element against the Coil spring is biased.

It is advantageous if the second bearing region rests radially from the inside and from the outside on the helical spring. As a result, the position of the coil spring against the intermediate element can be better secured. In particular, this makes it easy to realize a fastening of the intermediate element to the helical spring, for example when the radially inwardly and outwardly abutting parts of the second abutment region form elastic claws or flanges which rest under prestress on the helical spring. Also can be achieved by such a configuration in which the coil spring is effectively enclosed on both sides of the second investment area, a reliable physical isolation of the coil spring against the spring pad.

According to an advantageous embodiment, at least one reinforcing element is embedded in the intermediate element. The said reinforcing element is in this case at least predominantly enclosed by the intermediate element. Typically, it does not form part of the surface of the intermediate element. The reinforcing element serves to structurally reinforce the intermediate element and therefore usually has a greater rigidity than other parts of the intermediate element. Thus, the intermediate element, for example, predominantly consist of plastic, while a reinforcing element is cast into the plastic, which, for example, consists of metal or ceramic. In a broader sense, glass fibers, aramid fibers or carbon fibers, which are included in a plastic matrix for reinforcement, can also be considered reinforcing elements in this sense.

According to one embodiment, the first bearing region is at least partially planar. The plane in which it extends can in particular run perpendicular to the extension axis, i. H. coincide with the radial-tangential plane. In any case, here the surface of the spring pad opposite the first bearing area is also flat, which corresponds to a particularly simple shaping. This is in contrast to solutions in the prior art, in which the surface of a rubber-elastic spring pad itself is adapted to the shape of the spring. Often it is easier to design and manufacture to provide a correspondingly shaped intermediate member than to adapt the shape of the spring pad. In a newly formed investment area usually a particularly uniform pressure distribution can be realized.

In principle, an improvement over the prior art can already be achieved if the first contact region has only a very small radial extent, but in this case is not linear. In order to realize an effective pressure distribution, however, a radial extent of the first contact region advantageously corresponds to at least 50% of a thickness of a spring wire of the helical spring. The spring wire is of course the wire from which the coil spring is wound, the term being referred to in a broader sense also on coil springs, which are not made of metal, but, for example. Made of fiber-reinforced plastic. If the wire has a non-circular cross section, here the thickness of the wire in the radial direction is meant. More preferably, the radial extent corresponds to at least 75%, at least 100% or at least 150% of the thickness of the spring wire.

In order to fulfill its function according to the invention, it is sufficient if the intermediate element is arranged substantially in an area which is located in the axial direction between the spring wire (or the last turn thereof) and the spring pad. Accordingly, the intermediate element is preferably formed like an annular ring. This embodiment of the intermediate element is material and weight saving. It does not have to extend over a full circle, however, it is preferred that it extends tangentially over at least 180 °. In this case, it is preferable for the first bearing region to extend tangentially over at least 180 °. Both with regard to the intermediate element and the first contact area, larger extensions, for example over at least 270 °, are also conceivable.

Advantageously, rounded areas adjoin the side of the first contact area. D. h., The first investment area is not limited by sharp edges, but there is a soft transition, for example, to side surfaces of the intermediate element. Sharp edges could result in a deformation of the spring pad by the intermediate element arise in adjacent areas of the spring pad very different loads, which in turn could cause damage or premature fatigue of the spring pad. Such edges could, so to speak, "cut" into the spring pad. Also, depending on the direction of the force in the region of the edge, particularly high pressures could occur which, however, should just be avoided according to the invention.

Further advantageous details and effects of the invention are explained in more detail below with reference to an embodiment shown in the figures. Show it:

1 a schematic sectional view of a front view of a spring arrangement according to the invention within a suspension;

2 a bottom view of a part of the spring assembly 1 ;

3 a sectional view taken along the line III-III in 2 ; such as

4 a 3 corresponding sectional view of a spring arrangement according to the prior art.

In the different figures, the same parts are always provided with the same reference numerals, which is why these are usually described only once.

1 shows a schematic side view of a spring arrangement according to the invention 1 . the part of a suspension 20 of a motor vehicle. A wheel 21 is on a wheel carrier 22 rotatably mounted, which in turn has two wishbones 23 . 24 swiveling with a vehicle body 25 connected is. On a handlebar 24 is a lower spring plate 10 arranged while on the vehicle body 25 an upper spring plate 11 is arranged. The mentioned spring plates 10 . 11 form spring seats for a coil spring 2 , by means of which the vehicle body 25 opposite the wheel 21 , the wheel carrier 22 and the handlebars 23 . 24 is sprung. The coil spring 2 in the present case consists of spring steel, but alternatively, for example, could be used consisting of fiber reinforced plastic coil spring. The coil spring 2 extends along an extension axis A, which defines an axial direction and thus also a radial and tangential direction. It is understood that the suspension 20 usually also includes a shock absorber, which is not shown here for reasons of simplicity.

The coil spring 2 is supported indirectly on the two spring plates 10 . 11 from. In the case of the upper spring plate 11 is for a first spring pad 3 rubber interposed, attached to the spring plate 11 is applied. However, the coil spring is supported 2 not directly on the first spring pad 3 but via an interposed intermediate element 4 , which will be discussed in detail below. At the lower spring plate 10 supports the coil spring 2 over a likewise existing rubber second spring pad 5 from. The spring plates 10 . 11 as well as the spring documents 3 . 5 may possibly be the same design. It is understood that the embodiment shown is purely exemplary. So could, for example, a different type or number of links are used or the lower spring plate 10 could be right on the wheel 22 support. It would also be conceivable between the coil spring 2 and the second spring pad 5 to provide an intermediate element.

2 shows a bottom view of a part of the spring assembly 1 , wherein the plane of the drawing corresponds to the radial-tangential plane, perpendicular to the extension axis A. It can be seen that a final turn 2.1 the coil spring 2 within the intermediate element 4 is received, which is circular arc-shaped and extends over an arc of about 300 °. Depending on whether the Endwindung 2 .1 parallel to the plane or increases with respect to this, the intermediate element may be flat or ramp-like or helical rise. In any case, it is provided in the embodiment shown that a respect 2 rearward, the spring pad 3 facing side of the intermediate element 4 runs parallel to the drawing plane.

The further embodiment of the intermediate element 4 is in the sectional drawing in 3 recognizable, which is a section along the line III-III in 2 equivalent. It should be noted that in 3 overhead part related to 1 is below and vice versa. The intermediate element 4 consists mainly of thermoplastic material and has a base section 4.1 and two claw-like flange sections rising therefrom 4.2 . 4.3 on. At the side of the base section 4.1 , the spring pad 3 is facing, is a first investment area 4.4 formed on the one hand along a tangential direction T circumferentially along the entire intermediate element 4 on the other hand extends along a radial direction R along a distance, in the present case in about 150% of the thickness of a spring wire 2.2 the final turn 2.1 equivalent. The first investment area 4.4 is flat and thus corresponds to a flat surface 03.01 the spring pad 3 ,

The flange sections 4.2 . 4.3 embrace the spring wire 2.2 and are disposed radially inside and outside thereof. Due to the elasticity of the plastic, from which the intermediate element 4 is formed, the spring wire can 2.2 under bending of the flange sections 4.2 . 4.3 in a recess located therebetween 4.5 be inserted. When the spring wire 2.2 in the 3 has reached the end position, feathers the flange sections 4.2 . 4.3 However, they do not reach their original position because the recess 4.5 dimensioned slightly smaller than the spring wire 2.2 , Thus, the flange portions 4.2 . 4.3 against the spring wire 2.2 biased. It is therefore a non-positive as well as positive connection between the intermediate element 4 and the coil spring 2 given.

The to the recess 4.5 adjacent surfaces of the intermediate element 4 form a second investment area 4.6 which extends in the axial direction but also in the radial direction R. In particular, the latter is important insofar as this is the part of the coil spring 2 on the intermediate element 4 acting forces are distributed flat, creating the intermediate element 4 structurally relieved overall. In 3 this is by the below the first investment area 4.4 sketched pressure distribution p illustrated. While the position shown of the intermediate element 4 opposite the spring pad 3 corresponds to an unloaded or no-load condition in which the coil spring 2 exerts no pressure, corresponds to the drawn pressure distribution p a loaded state. Of course, this would be the intermediate element 4 in the surface 03.01 the spring pad 3 pushed in, but this deformation would remain rather slight due to the uniform pressure distribution p. To avoid stresses due to strong local pressure differences in the marginal areas of the first contact area 4.4 To avoid this, are the sides of the same rounded areas 4.7 . 4.8 provided by which a lower load on the spring pad 3 gives as if there were comparatively sharp edges. It may be sufficient if the intermediate element 4 completely made of plastic. Optionally, however, as in 3 drawn, a reinforcing element 6 , For example, be made of metal or ceramic, embedded in the plastic matrix. This stabilizes the intermediate element 4 Overall, which on the one hand can increase its life and on the other hand, a uniform force distribution can be better ensured.

The advantages of the inventive concept are compared with 4 clearly, the one configuration without intermediate element 4 shows. This is the spring wire 2.2 directly on the spring pad 3 which, when unloaded, corresponds to a contact area which is limited to one point along the radial direction R. At the in 4 illustrated loaded state deformed the spring wire 2.2 the surface 03.01 the spring pad 3 comparatively strong, which corresponds to a locally limited pressure distribution p with relatively high pressures. This locally limited, heavy load can lead to premature fatigue of the spring pad 3 come. More important, however, is that such a pressure distribution causes the spring pad 3 certain vibrations coming from the coil spring 2 emanate, can not dampen effectively, but transmits them to a greater extent. With a more even distribution of pressure as in 3 shown such transmission of vibrations is largely suppressed. Furthermore, by the interposition of the intermediate element 4 created a further interface, whereby a part of the vibrations or sound waves is not transmitted, but reflected.

LIST OF REFERENCE NUMBERS

1

 spring assembly

2

 coil spring

3, 5

 Spring pad

4

 intermediate element

4.1

 base section

4.2, 4.3

 flange

4.4

 first investment area

4.5

 recess

4.6

 second investment area

4.7, 4.8

 rounded area

6

 reinforcing element

10, 11

 spring plate

20

 Arm

21

 wheel

22

 wheel carrier

23, 24

 wishbone

25

 vehicle body

A

 extension axis

p

 pressure distribution

R

 radial direction

T

 tangential direction

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

• US 2010/0109428 A1 [0004]
• US 2014/0265081 A1 [0005]
• US 2015/0096536 A1 [0006]
• DE 102013009637 A1 [0007]
• EP 2172352 B1 [0008]
• KR 2012/0061624 A [0009]
• KR 2013/0017156 A [0010]
• KR 2015/0054378 A [0011]

Claims (10)

Spring arrangement ( 1 ) for a motor vehicle, having a helical spring extending along an extension axis (A) ( 2 ) and a rubber-elastic spring pad ( 3 . 5 ) for the indirect support of the coil spring on a spring seat ( 11 ), characterized in that between the coil spring ( 2 ) and the spring pad ( 3 ) at least one intermediate element ( 4 ) is arranged, which on the one hand on the coil spring ( 2 ) and on the other hand in the unloaded state with a radially extending first contact area ( 4.4 ) on the spring pad ( 3 ) is present. Spring arrangement according to claim 1, characterized in that the intermediate element ( 4 ) with a radially extending second contact area ( 4.6 ) on the coil spring ( 2 ) is present. Spring arrangement according to claim 1 or 2, characterized in that the helical spring ( 2 ) of the spring pad ( 3 ) is physically isolated. Spring arrangement according to one of the preceding claims, characterized in that the intermediate element ( 4 ) has a greater rigidity than the spring pad ( 3 ). Spring arrangement according to one of the preceding claims, characterized in that the intermediate element ( 4 ) on the coil spring ( 2 ) is attached. Spring arrangement according to one of the preceding claims, characterized in that the intermediate element ( 4 ) positively and / or non-positively with the coil spring ( 2 ) connected is. Spring arrangement according to one of the preceding claims, characterized in that at least one reinforcing element ( 6 ) in the intermediate element ( 4 ) is embedded. Spring arrangement according to one of the preceding claims, characterized in that the first investment area ( 4.4 ) is at least partially planar. Spring arrangement according to one of the preceding claims, characterized in that a radial extent of the first contact area ( 4.4 ) at least 50% of a thickness of a spring wire ( 2.2 ) of the coil spring ( 2 ) corresponds. Spring arrangement according to one of the preceding claims, characterized in that the intermediate element ( 4 ) is annular and extends tangentially over at least 180 °.

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