CN113775683A

CN113775683A - Elastomer bearing and bearing device

Info

Publication number: CN113775683A
Application number: CN202110634711.4A
Authority: CN
Inventors: P·科克扎
Original assignee: Benteler Automobiltechnik GmbH
Current assignee: Benteler Automobiltechnik GmbH
Priority date: 2020-06-09
Filing date: 2021-06-08
Publication date: 2021-12-10
Anticipated expiration: 2041-06-08
Also published as: DE102020115293B4; DE102020115293A1; CN113775683B

Abstract

The invention relates to an elastomeric support and a support device. The elastomer support comprises an inner sleeve (2), an outer sleeve (3) and an elastomer body (4) arranged between the inner sleeve (2) and the outer sleeve (3), wherein an outer layer (5) of elastomer is applied to the outer sleeve (3). According to the invention, the layer thickness (D) of the outer layer (5) of elastomer is less than or equal to 0.5 mm.

Description

Elastomer bearing and bearing device

Technical Field

The invention relates to an elastomer bearing and to a bearing arrangement having such an elastomer bearing according to the features of the preamble of claim 1.

Background

The elastomer bearing of the mentioned type of construction is also referred to in the generic term as rubber bearing and rubber-metal bearing. Such elastomer supports are used for attaching the chassis assembly to the vehicle body, in particular in the wheel suspension, and are used there, for example, as so-called subframe supports for supporting the subframe on the vehicle body.

Elastomeric bearings are used in motor vehicles to improve the driving comfort in order to dampen disturbing vibrations in the chassis and the transmission of said vibrations to the vehicle body. The acoustic properties are also improved by decoupling the vibrations of the engine unit and the chassis unit from the body of the motor vehicle.

Elastomeric supports typically have an inner sleeve and an outer sleeve with an elastomeric body encased between the inner and outer sleeves. A metal element for reinforcement may be provided within the elastomeric body. The inner sleeve is typically made of metal and the outer sleeve is made of metal or plastic.

The elastomer bearing is pressed into a bearing receptacle provided for this purpose on a link or other vehicle component. Here, on the one hand, the pressing in itself should take place with as little effort as possible and, on the other hand, the pressing force should not fall below a defined value. Force-locking and form-locking connections are suitable for this purpose, but for these connections the elastomer carrier and the carrier receptacle must be produced with great precision.

DE102009034337a1 discloses a form-locking composite body consisting of an elastomer support and a sleeve surrounding the cylindrical outer shell of the elastomer support.

Due to DE102009051159a1, a bearing device with a bushing and a rubber-metal bearing element which can be pressed into the bushing with an interference fit belongs to the prior art.

It is also known to provide the elastomer bearing with a rubber-coated layer on its outer sleeve and to introduce said elastomer bearing into the bearing receptacle by means of a lubricant. The lubricant diffuses into the rubber layer, thereby increasing the pressing force. The disadvantage here is the additional expenditure and the stopping time for the lubricant to penetrate. This rubber-coated layer or elastomer outer layer is usually sprayed and/or produced during vulcanization and has a thickness of 0.5 to 1mm or even more.

Disclosure of Invention

Starting from the prior art, the object of the invention is to provide an elastomer bearing which can be introduced into a bearing receptacle relatively easily and which has a desirably high pressing force, and a functionally improved bearing arrangement.

According to the invention, the solution of the object consists in an elastomer support according to claim 1.

Advantageous embodiments and developments of the elastomer support according to the invention are the subject matter of the dependent claims.

Claim 8 and its dependent claims are directed towards a support device with an elastomeric support according to the present invention.

The elastomeric support has an inner sleeve, an outer sleeve, and an elastomeric body. The elastomer body is arranged between the outer sleeve and the inner sleeve, wherein the elastomer body surrounds the inner sleeve and is connected to the inner sleeve in a rotationally fixed manner, and the outer sleeve surrounds the elastomer body and is connected to the elastomer body in a rotationally fixed manner. An outer layer of elastomer, i.e. an outer layer of elastomer material or an outer layer based on elastomer material, is applied to the outer sleeve.

According to the invention, an outer layer of elastomer is applied to the outer sleeve, said outer layer of elastomer having a thickness of less than or equal to (≦)0.5mm, preferably less than or equal to (≦)0.2mm, particularly preferably less than or equal to (≦)0.1 mm.

An outer layer of elastomer is applied to the outer circumference or outer side of the outer sleeve. The outer layer of elastomer is based on elastomer. The elastomer can elastically deform under tensile and compressive loads and then return to its original shape. The elastomers are also referred to in the art as rubbers, and are vulcanizates of natural and synthetic rubbers. By vulcanization, a (soft) rubber, i.e. an elastomer, is produced which is elastic and relatively durable.

The thin elastomer outer layer increases the pressing force in the support device by two effects. On the one hand, manufacturing-related gaps and irregularities between the outer sleeve and the bearing receptacle are compensated for by the elastic material. This results in a larger contact surface between the elastomeric bearing and the bearing receptacle. Furthermore, the coefficient of friction between the elastomer body and the bearing receptacle, which is usually metal, is greater than the coefficient of friction between the uncoated outer sleeve and the bearing receptacle. This results in a significant increase in the pressing force.

When the steel surface is coated with an elastomer or rubber, the increase in the pressing force is between 1.5 and 3 times compared to steel and steel. The coefficient of sliding friction in a steel-rubber or elastomer material pair is 0.5 + -0.1.

For example, an elastomer-based adhesion promoter can be used as a basis for the outer layer of the elastomer, as is well known for connecting incompletely or completely vulcanized elastomer elements to metal elements. The adhesion promoter comprises uncrosslinked monomers in a solvent, which monomers crosslink under the input of heat. Thereby creating an elastic mass. Alternatively, liquid elastomers known per se may also be used.

The outer layer of elastomer or the material forming the outer layer can be applied to the outer sleeve in a paintable or pasty manner without problems. Rolling or spraying is also possible. Furthermore, the elastomeric material forming the outer layer of elastomer may also be applied to the outer sleeve by a dip coating process. The coating process may comprise at least a dip coating process step.

The outer layer of elastomer is given the technically necessary structure by hardening, which can be effected chemically by the second component or by the input of heat during vulcanization. The vulcanization is carried out by the input of heat (for example in an oven), by induction heating or by radiant heat, in particular at a vulcanization temperature of approximately 160 ℃.

One aspect of the invention provides that the outer layer of elastomer is of a multi-layer construction. Thus, a plurality of layers of elastomer are concentrically applied on top of each other. It is also advantageous here that the thickness of the outer layer of elastomer can be adjusted in this way.

In this regard, one aspect of the invention provides that the outer layer is formed from at least two materials that are different from one another. In particular, the outer layer is constructed from two elastomeric materials that are different from each other. The layers or sheets forming the outer layer may also be adjusted to differ in their mechanical properties. In particular, the individual plies may have different elongational stresses, tensile strengths, elongations at break, tensile elastic moduli, tensile creep moduli, flexural strengths, brinell hardness, rockwell and shore hardnesses, impact toughness, sliding coefficients and/or sliding wear from one another.

In order to prevent damage to the thin elastomeric outer layer during the pressing-in of the elastomer bearing according to the invention, a lubricant can be used. The lubricant is accordingly dosed in small amounts and, if appropriate, is also applied only in regions. In this way, disadvantageously long drying times can be avoided.

The outer sleeve, which functions as a carrier for the elastomer layer, may be made of metal.

An advantageous embodiment provides that the outer sleeve is made of plastic. The advantageous properties of the outer layer consisting of an elastomeric material produce particularly advantageous effects in the case of an outer sleeve consisting of plastic. The embodiment according to the invention results in a significantly increased pressing force, in particular in an elastomer bearing with an outer sleeve made of plastic.

The outer layer may be vulcanized to the outer sleeve.

The outer layer may also be formed by coating or be formed by an adhesion promoter of elastomer. The adhesion promoter of the elastomer is formed based on the elastomer material.

Further, the outer layer may be formed of a liquid elastomer.

It is also possible to apply an outer layer of elastomer after vulcanization of the matrix of the elastomer support. This means that the inner sleeve, the outer sleeve and the elastomer body arranged between them are first vulcanised. The material of the outer layer is subsequently coated and cured. Such post-sulfiding may also be carried out in an oven.

In order to additionally increase the pressing force, the vulcanization of the uncrosslinked material of the outer layer can be carried out already installed in the bearing receptacle. Thereby, the connection between the outer sleeve and the bearing accommodation is enhanced. The invention therefore also relates to a bearing arrangement with an elastomer bearing accommodated in a bearing receptacle, wherein an outer layer of elastomer material is applied to the outer side of the outer sleeve. In particular, the vulcanization of the outer layer is carried out after the elastomer support has been mounted in the support reception. Heat is introduced here into the interface with the bearing receptacle. In this way, Post-vulcanization or Post-vulcanization (Post-vulkanization) of the elastomer bearing and the bearing receptacle is achieved.

Drawings

The invention is explained below with the aid of the figures. In the figure:

fig. 1 shows a technically simplified and schematically represented cross section of an elastomeric support according to the invention.

Detailed Description

Fig. 1 shows in cross-section the construction of an elastomeric support 1 according to the invention.

The elastomer support 1 comprises an inner sleeve 2, an outer sleeve 3 and an elastomer body 4 arranged between the inner sleeve 2 and the outer sleeve 3. An outer layer 5 of elastomer is applied to the outer sleeve 3.

The inner sleeve 2 is made of metal. The outer sleeve 3 may be made of metal or plastic.

The outer layer 5 of elastomer is made of an elastomer-based material. The outer layer 5 completely surrounds the outer circumference or outer lateral surface of the outer sleeve 3. The outer layer 5 has a layer thickness D which is designed to be less than or equal to (≦)0.5 mm. In particular, the layer thickness D is designed to be less than or equal to (≦)0.2mm, and particularly preferably, the layer thickness D is designed to be less than or equal to (≦)0.1 mm.

By means of the thin, elastic and damping outer layer 5 of elastomer, the gap which actually exists in the contact region between the outer circumferential surface of the elastomer bearing 1 and the bearing seat is filled or filled and thus the contact surface is increased. At the same time, the material pairing results in a significant increase in the friction between the components.

The outer layer 5 of elastomer is preferably vulcanized to the outer sleeve 3. The vulcanization of the outer layer 5 can be carried out before or after the installation of the elastomer support 1 in the support reception. By post-vulcanization of the elastomer support 1 (in which the elastomer support 1 is mounted in the support receptacle of the support device), a vulcanization-technical joint is achieved between the elastomer support 1 or the outer sleeve 3 of said elastomer support and the support receptacle via the outer layer 5. This achieves a material-locking connection of the components at the interface. The members joined to each other are bonded to each other. This significantly increases the pressing force.

The outer layer 5 may be formed of a uniform elastomeric layer. The outer layer 5 can also be of multilayer design, i.e. of at least two layers made of or based on an elastomer material.

The bearing arrangement with the elastomer bearing 1 according to the invention allows functional improvements of the bearing arrangement both in terms of production and in terms of operational flexibility.

List of reference numerals

1 elastomer support

2 inner sleeve

3 outer sleeve

4 elastomer body

5 outer layer

Thickness of D layer

Claims

1. An elastomer support having an inner sleeve (2), an outer sleeve (3) and an elastomer body (4) arranged between the inner sleeve (2) and the outer sleeve (3), an outer layer (5) of elastomer being applied to the outer sleeve (3), characterized in that the outer layer (5) has a layer thickness (D) of less than or equal to 0.5 mm.

2. An elastomer support according to claim 1, wherein the layer thickness (D) is less than or equal to 0.2mm, in particular less than or equal to ≦ 0.1 mm.

3. An elastomeric support according to claim 1 or 2, wherein said outer layer (5) is multilayered.

4. An elastomer support according to claim 3, characterized in that the outer layer (5) is formed of at least two materials, in particular elastomer materials, different from each other.

5. An elastomer support according to any of claims 1 to 4, characterized in that said outer layer (5) is vulcanized onto said outer sleeve (3).

6. An elastomeric support according to any one of claims 1 to 4, wherein said outer layer (5) is formed from an adhesion promoter of elastomeric material.

7. An elastomeric support according to any one of claims 1 to 4, wherein said outer layer (5) is formed of a liquid elastomer.

8. A support device comprising an elastomeric support according to any one of claims 1 to 7.

9. Support device according to claim 8, characterized in that the outer layer (5) is connected to the support reception by means of a vulcanization process.

10. Support device according to claim 9, characterized in that said outer layer (5) is connected by the effect of the temperature during post-vulcanisation after the installation of the elastomer support in the support housing.