DE102007046770A1 - Bush bearing has central inner core for receiving fixing screw, housing which is connected with elastomer and surrounds inner core, and radial rod of high radial rigidity - Google Patents

Abstract

The bush bearing has a central inner core (2) for receiving a fixing screw, a housing connected with an elastomer (4) and surrounds the inner core. The bush bearing has a radial rod of high radial rigidity and a pocket with low radial rigidity than in the area of the radial rod. The inner core is vulcanized in the housing.

Description

The The invention relates to a bush bearing with circumferentially changing Rigidity with a central inner core for receiving a fastening screw, one connected to an elastomer and surrounding the inner core Housing, at least one radial web of high radial stiffness and a kidney with lower radial stiffness than in the area of the radial walkway.

such Bushing bearing, which is preferably designed as a rubber-metal bearing are in the circumferential direction have different radial stiffnesses on. To achieve these different stiffnesses and desired Identifiers have such bearings in a first radial main loading direction, which in the longitudinal direction of the bush bearing extends, at least one radial web with high rigidity, Preferably, two coaxially arranged radial webs are diametrically opposite and extending radially outward from the center of the bushing bearing arranged extending. In a second, preferably the first radial main loading direction arranged at right angles Radial direction is at least one kidney formed, which a lower in this area radial stiffness of the bearing causes.

such Bushing bearings are used for different applications used, in particular in the vehicle industry. Especially for the storage of components of the chassis Bush bearing required, which related to their scope have different radial stiffness or identifications. Here are used bearings that have a large identification ratio with regard to their different radial stiffnesses, d. H. Areas of high radial stiffness and those with a high radial stiffness the opposite significantly lower radial stiffness exhibit. Preferably, such bushings bearing two along a longitudinal direction coaxial with each other extending radial webs with high rigidity and at right angles Kidneys are trained on both sides, with one in this area in its thickness reduced elastomeric bearing body.

Such a bush bearing is for example from the DE 10 2005 003 945 known. In this bushing bearing the radial web is also formed with an alternating sequence of layers of elastomer and insert elements made of sheet metal or plastic, so that there is a comparatively high ratio of the identifier in the region of the web and arranged at right angles kidney.

Generally have such bushings bearing a large spread between the longitudinal and transverse stiffness at the lowest possible Torsional rigidity.

The existing bushings is common that the core means in the inside the housing surrounding elastomer to achieve Pressing a press fit, the fixation of the core in the housing as occurs via a frictional connection, wherein the for the application case necessary contact pressure achieved only in installation position is, for. B. when installed in a receiving eye.

The when clamping the bush bearing in installation position caused non-positive However, compound only achieves a tight fit of the core at corresponding conditions Torsional forces. Occasionally the outdoor area slips too of the core at the core surface through which the desired Identification ratio distorted. That's how it works only a lower longitudinal stiffness than desired achieved. Finally, the existing bushings are associated with the disadvantage that between the core and the housing penetrating impurities by changing the adhesive properties on the adjoining surfaces the identification ratio and can negatively affect stiffness.

outgoing From this prior art, the invention is based on the object to avoid these disadvantages at least partially and a bush bearing provide, which is a particularly homogeneous identification ratio and at the same time much less sensitive to contamination is.

This is achieved in a bush bearing of the type mentioned, characterized that the inner core is vulcanised into the housing. By vulcanization is a two-sided solid connection between the inner peripheral surface of the annular Housing and the outer peripheral surface of the annular Achieved inside core. The vulcanization takes place in a known Way by using a primer on the metal surface the housing and the inner core, which deals with the elastomer combines. The inventive construction has the advantage of larger connected areas so that a better defined attainable stiffness can be achieved is. The ratio of the bound to the unbound area allows an exact setting of the desired Stiffness depending on the application. In addition, the inventive Bush bearing a significantly higher preload during installation achieve, for. B. 4 KN in the longitudinal direction and 0.2 KN in the transverse direction with a torsional rigidity of 1.5 Nm per degree.

Preferably, the housing of the bush bearing consists of at least two half shells to form a closed ring body in one construction position, wherein the half-shell installation position adjacent abutting surfaces. This embodiment of a plurality of half-shells, preferably two half-shells of approximately equal size, simplifies the production of the bushing bearing because it can now be produced in a single vulcanization process due to the lack of assembly of the core. In addition, this production offers the possibility of compensating tensile stresses due to the shrinkage behavior of the elastomer during cooling. The half shells of the housing, which are enclosed on all sides by the elastomer, contract during shrinking to a predetermined distance dimension, which corresponds to the pretensioning dimension, so that they are stress-free.

at A preferred development are the abutment surfaces the adjacent half shells with positive fit formed interlocking connection means. Preferably these connection means have a tongue and groove connection to Sliding / torsional rigidity of the half shells in the bearing insert.

Preferably has the bush bearing according to the invention in the Radial webs embedded intermediate elements in the form of intermediate plates or the like for reducing the transverse rigidity and increasing the longitudinal stiffness. Thus, a significant increase the longitudinal stiffness achieved at the same transverse stiffness.

The Preload on the bush bearing is over the so formed Radial packages applied during assembly and this bias is then used to bias the inner torsion track defined.

Further Details, advantages and features of the invention can be the in the following part of the description, in which an embodiment example the device according to the invention with reference to four Drawings is explained in more detail. Show it:

1 A front view of the bushing bearing according to the invention in the untensioned state;

2 a cross section of the bushing bearing according to 1 .

3 a front view of the bush bearing in the prestressed state and

4 a cross section of the bushing bearing according to 3 ,

Accordingly, the bush bearing according to the invention consists of a hollow cylindrical, metallic inner core 2 with a central receiving opening for receiving a fastening screw, not shown, one with an elastomer 4 surrounding and the inner core 2 enclosing housing 6 , two radial webs extending colinearly along the longitudinal extension direction 8th . 10 high radial stiffness as well as lateral kidneys 16 . 18 with lower radial stiffness than in the area of the radial webs 8th . 10 ,

In the present embodiment, the housing 6 formed in two parts and consists of a lower half-shell 6a and an upper half shell 6b , which rest against each other in abutment position abutting surfaces and are mutually mirror-symmetrical.

The inner core, which is designed according to the purpose of the bearing as a tubular, that is hollow, or as a substantially solid element, is in contrast to known bushing bearings on the housing enclosing elastomer on all sides 4 both on the outside of the inner core 2 as well as on the inside of the case 6 vulcanized. In contrast to the prior art, this no longer requires a separate inner core in a separate production step 2 be pressed into an already enclosed with an elastomer housing. Instead, the inner core 2 about that between the inner core 2 and the housing 6 arranged elastomer bonded on both sides with this. The bonded surface is on the outer circumferential surface of the inner core 2 wider than formed on the inner circumferential surface of the housing 6 , Due to this different ratio of the bound surfaces to unbound surfaces, the rigidity can be set exactly according to the application.

The radial webs 8th . 10 are constructed in layers, wherein in the radial direction elastomeric areas with metallic and / or plastic plates 12 . 14 alternate. The outermost layer is formed by a plate member which has a circular-segment-shaped outer contour for mounting the bushing bearing in an unillustrated annular receiving eye or a sleeve.

The 1 and 2 show the bushing bearing according to the invention in the relaxed state. Clearly visible is the trapezoidal in cross-section elastomer 4 between the outer surface of the inner core 2 and the inner surface of the housing 6 , with its dependent on the application ratio of bonded to unbound surface, which allows an exact setting of the desired stiffness of the bush bearing with much higher preload than in known bushings bearings.

In the 3 and 4 is the bush bearing shown in the installed position under bias, wherein the longitudinal direction, ie in the axial direction of the radial webs 8th . 10 a biasing force was applied upon insertion into the receiving eye, not shown. It will do that between the inner core 2 , the housing 6 and at the radial webs 8th . 10 , arranged elastomer 4 compresses in a known manner and swerves.

Of the The subject of the present invention is not exclusive the subject of the individual claims, but from the Combination of the individual claims among each other. All in the documents, including the abstract Tasks and features, in particular those shown in the drawings Spatial training, are claimed as invention essential, as far as individually or in combination with the state of the art Technology is new.

2

inner core

4

elastomer

6

casing

6a

lower half shell

6b

upper half shell

8th

radial web

10

radial web

12

plate

14

plate

16

kidney

18

kidney

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 102005003945 [0004]

Claims (4)

Bushing bearing with circumferentially changing rigidity with a central inner core ( 2 ) for receiving a fastening screw, one with an elastomer ( 4 ) and the inner core ( 2 ) enclosing housing ( 6 ), at least one radial web ( 8th . 10 ) high radial stiffness and a kidney ( 16 . 18 ) with lower radial stiffness than in the region of the radial web ( 8th . 10 ), characterized in that the inner core ( 2 ) in the housing ( 6 ) is vulcanized. Bush bearing according to claim 1, characterized in that the housing ( 6 ) of at least two half-shells ( 6a . 6b ), which in the installation position adjacent abutting surfaces. Bush bearing according to claim 2, characterized that the half shells on the abutting surfaces a positive Have connection. Bush bearing according to one of the preceding claims, characterized in that the radial web ( 8th . 10 ) at least one plate-shaped insert element ( 12 . 14 ) for forming a radial layer sequence consisting of elastomer ( 4 ) and insert element ( 12 . 14 ) having.