DE102020113941B4 - rubber-metal bearing - Google Patents

Abstract

Rubber-metal mount (10), comprising an outer bearing sleeve (12), a bearing core (14) and an elastomer body (16) arranged between the outer bearing sleeve (12) and the bearing core (14), wherein the bearing core (14) moves in the axial direction (a ) considered a first and a second end face (14-1, 14-2), wherein the elastomer body (16) in the region of the first and / or second end face (14-1, 14-2) in the axial direction (a) over the end face (14-1, 14-2) has an elastomer extension (16-1, 16-2) protruding, characterized in that the end face (14-1, 14-2) has a diameter extending over the end face (14-1, 14-2) has extending groove (22), in which the elastomer extension (16-1, 16-2) is arranged.

Description

The invention relates to a rubber-metal bearing, in particular for a wheel suspension of a motor vehicle, of the type specified in the preamble of patent claim 1.

Rubber-metal bearings, also called elastomeric bearings, are well known from the prior art and generally comprise an outer bearing sleeve, a bearing core aligned concentrically thereto and having a core bore, and an elastomeric body arranged between the outer bearing sleeve and the bearing core, cf. DE 10 2014 224 602 A1 . The outer bearing sleeve and bearing core must be firmly attached to the associated components, so that movements of the bearing take place exclusively via the elastomer body. An undesired bearing slip that should be avoided occurs when there is a relative movement of the bearing core to its assigned component when a force or moment is applied. The force is usually transmitted from the end face(s) to the associated component by friction.

A generic, all the features of the preamble of claim 1 having rubber-metal bearing is in DE 89 02 251 U1 disclosed.

The invention is based on the object of further developing a rubber-metal bearing according to the type specified in the preamble of patent claim 1 in such a way that the risk of the bearing slipping is minimized.

This object is achieved by the characterizing features of patent claim 1 in conjunction with its preamble features.

The dependent claims form advantageous developments of the invention.

In a known manner, the rubber-metal bearing, provided in particular for a wheel suspension of a motor vehicle, comprises a bearing outer sleeve, a bearing core aligned coaxially thereto and having a core bore, and an elastomer body arranged between the bearing core and the bearing outer ring when viewed in the radial direction r. The elastomer body is materially bonded, e.g. by vulcanization, to the bearing core and the bearing outer ring. In addition, viewed in the axial direction a, the bearing core has two end faces, in the form of a circular ring, also referred to below as the first and second end faces.

Rubber-metal mounts of this type are used, for example, for the pivoting mounting of chassis links on the body side. While the outer bearing sleeve is firmly connected to the link, e.g. by being pressed into a bearing eye of the link, the bearing core is non-positively connected to a bearing bracket provided on the body or subframe by means of a screw that penetrates the core bore.

Furthermore, it is provided that the elastomer body in the region of the first and/or second end face has an elastomer extension projecting beyond the end face in the axial direction a.

The protruding design has the effect that - if the rubber-metal bearing or the bearing core is now attached to a bearing bracket by means of a screw connection - the elastomer body is compressed via the elastomer extension applied to the bearing bracket until the bearing core has its end face on the bearing bracket applied. That is, part of the screw preload force is transmitted via the elastomer extension. Since there is an increased coefficient of friction in this area, this also increases the maximum frictional force to be transmitted. The occurrence of an undesired rotational movement of the bearing core, i.e. a relative movement between the bearing core and the outer bearing sleeve, is thereby prevented or made more difficult, so that the risk of the bearing slipping is advantageously minimized.

According to the invention, it is provided that the end face has a groove which extends over the diameter of the end face and in which the elastomer extension is arranged. The inventive arrangement of the elastomer extension in a groove extending across the diameter of the end face has the advantage that the elastomer extension is now in contact with the bearing bracket over a larger contact area, with the result that this also increases the frictional force to be transmitted.

The groove is preferably dimensioned in such a way that the groove width b of the groove corresponds to the diameter of the core bore in the bearing core.

The groove depth t of the groove is preferably dimensioned such that the following applies to the groove width b: $$0.01\le \text{Groove depth t/groove width b}\le \text{0}\text{,1}\text{.}$$

wobei mit Lagerlänge L die Erstreckung des Gummi-Metall-Lagers in axialer Richtung a ausgehend von der ersten zur zweiten endseitigen Stirnfläche bezeichnet ist.The overhang d by which the elastomer extension extends in the axial direction beyond the first and/or second end face is application-specific and dependent on the Shore hardness. First tests have shown that the overhang should preferably be dimensioned in such a way that: $$0.01\le \ddot{\text{u}}\text{overhang d/storage l}\ddot{\text{a}}\text{length L}\le \text{0}\text{,05}\text{,}$$

where the bearing length L denotes the extension of the rubber-metal bearing in the axial direction a, starting from the first to the second end face.

According to a further embodiment which is not claimed, the elastomer extension is designed as a circumferential bead. Since the peripheral bead can be produced during the vulcanization process without additional processing steps, simple, cost-effective production is guaranteed.

A further embodiment that is not claimed provides that the elastomeric extension is designed in the form of a plurality of segmented circular arc sections that are separated from one another in the circumferential direction u. The formation of the elastomeric extension in the form of several segmented circular arc sections has proven to be advantageous, since an appropriate selection of the number n of segmented circular arc segments, their circumferential distribution and/or their length allows greater design freedom and thus a design with regard to concrete application-specific problems is.

For example, a uniform distribution of the segmented circular arc sections in the circumferential direction u is conceivable, in which case the circular arc sections are of the same length in relation to their length, i.e. the circular arc sections have the same circular arc length.

Depending on the application, a non-uniform distribution of the segmented circular arc sections in the circumferential direction u is also conceivable. The non-uniformly distributed segmented arc sections can either be of the same size, i.e. having an arc length of the same size, or of unequal size, i.e. having different arc lengths.

The number n of the segmented circular arc sections is also to be specified accordingly: the number should preferably be n≧4, in particular n=5.

Further advantages and application possibilities of the invention result from the following description in connection with the exemplary embodiment illustrated in the drawing.

• 1 ein Gummi-Metall-Lager nach dem Stand der Technik;
• 2a ein Gummi-Metall-Lager gemäß einer ersten, nicht beanspruchten Ausführungsform;
• 2b eine, nicht beanspruchte zweite Ausführungsform eines Gummi-Metall-Lagers, und
• 2c ein erfindungsgemäßes Gummi-Metall-Lager.

In the drawing means:

• 1 a rubber-metal bearing according to the prior art;
• 2a a rubber-metal bearing according to a first, non-claimed embodiment;
• 2 B a non-claimed second embodiment of a rubber-metal bearing, and
• 2c a rubber-metal bearing according to the invention.

In the following description and in the figures, to avoid repetition, the same parts and components are identified with the same reference numbers, provided that no further differentiation is necessary or useful.

1 shows a rubber-metal bearing according to the prior art, which is denoted overall by the reference number 10 .

The rubber-metal bearing 10 comprises an outer bearing sleeve 12, a bearing core 14 arranged concentrically thereto and an elastomer body 16 arranged between the outer bearing sleeve 12 and the bearing core 14, viewed in the radial direction r.

The elastomeric body 16 is vulcanized onto the outer sleeve 12 and the bearing core 14 and holds them elastically yielding in a relative position to one another.

The bearing core 14, which is made of metal in the present case, serves to accommodate a fastening means, such as a screw, and has a cylindrical core bore 18 for this purpose. The annular end faces of the rubber-metal bearing 10 viewed in the axial direction a are denoted by the reference symbols 14-1, 14-2.

Rubber-metal mounts of this type are used in the chassis area, e.g. to mount a control arm on the body or subframe. For this purpose, the outer bearing sleeve 12 is firmly connected to the handlebar, while the bearing core 14 is attached to the body or subframe. While the outer bearing sleeve 12 is usually pressed into an opening provided for this purpose on the handlebar, the bearing core 14 is generally fastened non-positively by means of a screw connection to a bearing bracket 20 provided on the bodywork or subframe. The bearing core 14 is firmly connected to the bearing bracket 20 on the body or subframe side via the screw connection, so that relative movements occurring during operation are carried off exclusively via the elastomer body 16 . If an undesired relative movement nevertheless occurs between the bearing core 14 and the associated component, this is referred to as a so-called bearing slip.

Bearing slipping must be avoided, since the measures necessary for the proper repair of the bearing, such as installing friction-increasing inserts, roughening the end faces of the bearing core and/or roughening the bearing brackets and/or installing a larger screw, have corresponding disadvantages in terms of installation space, costs, Bring weight function etc. with it.

• Das erfindungsgemäße Gummi-Metall-Lager 10 weist einen im Wesentlichen dem zuvor beschriebenen entsprechenden Aufbau auf.

This is where the invention comes in:

• The rubber-metal bearing 10 according to the invention has a structure which essentially corresponds to that described above.

However, the rubber-metal bearing 10 is characterized in that the elastomer body 16 in the region of the first and second end face 14-1, 14-2 has an elastomer extension that protrudes in the axial direction a beyond the corresponding end face 14-1, 14-2 16-1, 16-2. how 2a until 2c As can be seen, the elastomer extension 16-1, 16-2 has a projection d in relation to the associated end face 14-1, 14-2.

If the rubber-metal bearing is now 10 - as in 1 shown - fastened by means of a screw connection between the legs of a bearing bracket 20, when the screw connection is tightened the elastomer body 16 is compressed over the elastomer extension 16-1, 16-2 resting on the legs of the bearing bracket 20 until the bearing core 14 over its end face 14-1 , 14-2 rests against the legs of the bearing bracket 20. That is, part of the screw preload force is transmitted via the elastomer extension 16-1, 16-2.

Due to the higher coefficient of friction in this area, a greater frictional force can also be transmitted with the result that an (undesirable) rotary movement of the bearing core 14 in relation to the bearing bracket 20 and thus a relative movement between the bearing core 14 and the outer bearing sleeve 12 is prevented or made more difficult. so that the occurrence of bearing slipping is advantageously prevented or made more difficult.

• So ist gemäß der in 2a dargestellten Ausführungsform der Elastomerfortsatz 16-1, 16-2 in Form eines umlaufenden Wulstes ausgebildet. Die in 2b dargestellte Ausführungsform zeichnet sich durch eine segmentierte Ausbildung des Elastomerfortsatzes 16-1, 16-2 aus, nämlich in Form von fünf, in Umfangsrichtung u gleichmäßig verteilten Kreisbogenabschnitten. Gemäß der in 2c dargestellten Ausführungsform, ist der Elastomerfortsatz 16-1, 16-2 jeweils in einer in den Stirnfläche 14-1, 14-2 des Lagerkerns 14 eingebrachten Nut 22 angeordnet. Die Nut 22 erstreckt sich dabei über den Durchmesser des Lagerkerns 14 und weist eine dem Durchmesser der Kernbohrung 18 entsprechende Nutbreite b auf.

Various embodiments are conceivable with regard to the design of the elastomer extension 16-1, 16-2:

• This is according to the in 2a illustrated embodiment of the elastomer extension 16-1, 16-2 in the form of a circumferential bead. In the 2 B The illustrated embodiment is characterized by a segmented design of the elastomeric extension 16-1, 16-2, specifically in the form of five circular arc sections distributed uniformly in the circumferential direction u. According to the 2c In the illustrated embodiment, the elastomeric extension 16 - 1 , 16 - 2 is arranged in a groove 22 made in the end face 14 - 1 , 14 - 2 of the bearing core 14 . The groove 22 extends over the diameter of the bearing core 14 and has a groove width b corresponding to the diameter of the core bore 18 .

Claims (4)

Rubber-metal mount (10), comprising an outer bearing sleeve (12), a bearing core (14) and an elastomer body (16) arranged between the outer bearing sleeve (12) and the bearing core (14), wherein the bearing core (14) moves in the axial direction (a ) considered a first and a second end face (14-1, 14-2), wherein the elastomer body (16) in the region of the first and / or second end face (14-1, 14-2) in the axial direction (a) has an elastomer extension (16-1, 16-2) protruding beyond the end face (14-1, 14-2), characterized in that the end face (14-1, 14-2) has a diameter extending over the end face (14- 1, 14-2) extending groove (22) in which the elastomer extension (16-1, 16-2) is arranged. rubber-metal bearing (10). claim 1 , characterized in that the groove (22) has a groove width (b) corresponding to the diameter of a core bore (18) in the bearing core (14). rubber-metal bearing (10). claim 2 , characterized in that the groove (22) has a groove depth (t) for which the following applies in relation to the groove width (b): $$0.01\le \text{groove depth}\left(\text{t}\right)\text{/groove width}\left(\text{b}\right)\le \text{0}\text{,1}\text{.}$$

rubber-metal bearing (10). claim 1 , characterized in that in the axial direction (a) the rubber-metal bearing (10) starting from the first end face (14-1) to the second end face (14-2) has a bearing length (L) and that the elastomer extension (16-1, 16-2) viewed in the axial direction (a) in relation to the end face (14-1, 14-2) has a projection (d) for which the following applies in relation to the bearing length (L): $$0.01\le \ddot{\text{u}}\text{survived}\left(\text{i.e}\right)\text{/stock}\ddot{\text{a}}\text{ng}\left(\text{L}\right)\le \text{0}\text{,05}\text{,}$$

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