DE102015104656A1 - Component, in particular suspension strut or link or elastomeric bearing - Google Patents

Abstract

The invention relates to a component, in particular a chassis component such as suspension strut or elastomeric bearing / rubber bearing (10) with inner sleeve (14), elastomer body / rubber body (13) and outer sleeve (11), wherein the component sliver (6) and in a base body of the component of injection-molded plastic (15) with a weld line (5) sliver (6) in the region of the weld line (5) is arranged and / or - in a component in the form of an elastomeric bearing / rubber bearing (10), the outer sleeve (11 ) and / or inner sleeve (14) consists of sliver (6) or sliver (6) and is connected by vulcanizing integrally / cohesively or positively with the elastomeric body / rubber body (13).

Description

The invention relates to a component, in particular a link element, such as a suspension strut with one or more bearing or joint elements or an elastomer bearing and is used in particular in a chassis of a motor vehicle application. Suspension link, for example, wishbone, stabilizer arm or similar suspension struts for a motor vehicle have a body (arms, connection joints) and at least two bearing or joint points for connection to the body, the chassis or to another vehicle part (suspension strut, suspension, etc.) of Motor vehicle on and are used in wheel suspensions of motor vehicles. Since such components are usually produced in large quantities, efficient production is of great importance. In addition, wishbones are subject to high dynamic loads, resulting in correspondingly high demands on the mechanical properties. Furthermore, it is desirable in terms of lightweight construction that they have a low weight. From the prior art, a variety of constructions are already known, with which it was attempted to meet the requirement profile described above. Furthermore, so-called rubber-metal bearings are used in such suspension components, which have an inner sleeve, an inner sleeve surrounding elastic material (elastomer) and an outer sleeve made of aluminum, steel or plastic. The inner sleeve, the elastomeric body and the outer sleeve are pressed together or vulcanized the elastomer in or on the bearing sleeves. At high loads there is a risk that this compound dissolves. If the rubber-metal bearing is inserted into a component, there is also the risk that the connection between the outer sleeve and the component will be damaged under high stress or that the connection will loosen.

From the publication DE 40 215 47 A1 For example, a method for producing fiber-reinforced components such as turbine drive shafts is known, in which a carrier body is surrounded with at least one fiber coated with a matrix material, the carrier body provided with the fiber is surrounded by a capsule and the capsule is evacuated and then heated and all sides high Pressure is suspended. According to a first variant of this solution, the carrier body is wrapped with at least one endless sliver. The endless sliver consists of a plurality of endless fibers, which are arranged side by side substantially in at least one plane and embedded in matrix material. The cross section of the sliver is substantially rectangular. Instead of single-layer fiber ribbons, it is also possible to use multilayer belts in which the individual fibers are arranged side by side in several planes. Matrix material is then applied to the sliver layer in order to obtain, in the subsequent post-processing of the component after hot isostatic pressing, an outer layer which is not penetrated by fibers and can thus be processed. If the carrier body is to be surrounded or enclosed by a plurality of sliver layers, it is provided according to a development, when the carrier is wrapped, to arrange the slivers of respectively two successive layers offset from one another. This method is relatively expensive.

In WO2006 / 119101 A1 For example, there is described a heavy duty vehicle chassis having a composite beam coupled to an axle. However, the production of composite material is relatively expensive.

A four-point link for the suspension of a rigid axle, in particular a commercial vehicle with four bearing mounts, with two bearing mounts on the vehicle axle and two bearing mounts are articulated to the vehicle frame, is from the document DE 10 2011 079 654 A1 known. In this case, the four-point link comprises a one-piece link body of the trapezoid formed by the bearing receptacles is inscribed. The four-point link is characterized in that the link body is formed of a fiber composite assembly. In this case, the fiber composite arrangement comprises at least one longitudinal fiber arrangement. The longitudinal fiber assembly encloses the bearing receiver at least along its half circumference and at the same time runs along at least parts of the handlebar body. Rubber bearings are used for the articulation of the four-point link. In this case, crosswise arranged on the handlebar body or the handlebar body forming longitudinal fiber arrangements, such as unidirectional bands of a fiber composite material, the two diagonally opposite bearing pairs pairs connected to each other and simultaneously with the handlebar body. For this purpose unidirectional fiber ribbons or prepreg layers (tissue or fiber arrangements preimpregnated with matrix material) are wound crosswise over a core and / or over the bearing receptacles fixed in a winding device by a winding technique. Alternatively, a single longitudinal fiber arrangement can be assigned to all four bearing receptacles of the four-point link and these can be produced by winding technology. The disadvantage is that an insufficiently intimate connection between the rubber layers and the bands is realized and that the production is very complicated and costly overall.

From the publication DE 698 36 028 T2 is a composite link in the art a Lenkerarms known which has two end joint receptacles with rubber-metal sleeves, between which a tube of glass fibers sitting as a strut body. The gel receptacles and the tube are joined together by wrapping with fiber strands or slivers, thereby producing the link. The fibers used are glass fibers, carbon fibers (graphite), polymer fibers (aramid) or combined fibers. This production is relatively complicated and expensive.

In the publication DE 10 2007 041 324 A1 Rubber-metal bearings are described which are used for coupling a wheel-guiding handlebar. The bearing comprises an outer sleeve, an inner body and an elastically connecting elastomer body. Here, the outer sleeve serve 2 and the inner body 3 depending on the installation situation for attachment to the vehicle body, an auxiliary frame thereof, on a wheel or on a wheel-guiding handlebar. The outer sleeve is formed as a thin-walled sheet metal element or plastic and is pressed into a corresponding opening. The elastomer body 4 is vulcanized with its inner circumference to the outer circumference of the inner body and is radially enclosed by the outer sleeve. If there is insufficient connection between the outer sleeve and the elastomer body, there is a risk that it will detach under high stress.

The DE 10 2011 007 390 A1 describes a chassis component having at least two attachment points and a structural part extending between the attachment points and connecting them rigidly to one another. The loose connection of the two parts by a connecting element, the overall structure is extremely unstable.

It is also known to produce the basic body between hinge points of a chassis part simply and inexpensively by injection molding, the disadvantage being that in the region of the weld line of the plastic, a low binding of the co-flowed plastic fronts is recorded and there is a failure in this area of the component can come.

The invention has for its object to develop a component, in particular a chassis component such as a suspension strut or an elastomeric bearing with inner sleeve, elastomer body and outer sleeve for use in a chassis of a motor vehicle, which is simple and inexpensive to produce and withstands the high stresses.

This object is achieved with the features of the first claim.

Advantageous embodiments emerge from the subclaims.

The component, which is designed in particular in the form of a suspension strut or a suspension arm or in the form of an elastomeric bearing with inner sleeve, elastomer body and outer sleeve and is used in a chassis of a motor vehicle, according to the invention has sliver, wherein at a base body of the chassis component (eg suspension strut or Handlebar) is made of injection-molded plastic with a Bindenaht sliver in the field of Bindenaht and / or an elastomeric bearing, the outer sleeve and / or the inner sleeve of sliver or sliver and has by vulcanizing integral / cohesively or positively connected to the elastomer body.

By using sliver in the area of the weld line of an injection-molded component, the strength can be increased many times over. Investigations have shown that the tensile strength could be increased to a multiple and in some applications to about 1000 times compared to a component without sliver and that the component tears outside the sliver.

It is of course also possible to reinforce other components produced by injection molding in the field of weld line with sliver, such as rod-shaped parts, profile parts, sleeves, containers, etc., if these increased requirements must withstand and in the field of weld line there is a risk that the component in this area of the weld line breaks or tears under increased stress.

The fiber band reinforcing the region of the component in the area of the weld line can be strip-shaped or hollow-type and, for example, formed / cut from a semifinished product in the form of strip-shaped fiber sliver or tubular semifinished product of wound fiber sliver. The cross section of the tubular semifinished product made of wound sliver can be adapted to the shape of the cross section of the component.

In a preferred embodiment, the sliver is embedded over its entire length and / or the entire circumference of the chassis component in the chassis component. Preferably, the sliver is not completely embedded, but is aligned on its upper side with the adjacent outer surface of the chassis component.

Preferably, the sliver of fiber composite material with continuous fibers and a Formed polymer matrix, wherein the fibers of the sliver substantially vertically or at a different angle over the Bindenahtebene and these are overlapping / overlapping embedded in the main body by an injection molding process.

It is advantageous if strip-shaped sliver is provided on several sides, for example on two opposite sides or also on all sides or a sliver surrounding the region of the weld line, preferably from a tubular wound semifinished product in the region of the weld line.

If, for example, the outer sleeve and / or the inner sleeve of an elastomeric bearing are formed from sliver, a tubular semi-finished product wound from sliver is used in particular as a starting base, which is cut to length.

Advantageously, the outer sleeve wound from sliver and / or the inner sleeve of the elastomeric bearing may have one or more slots on the outer and / or inner circumference, which run parallel and / or at an angle to a longitudinal axis of the elastomer bearing. In the vulcanization process, the rubber material can engage in the slots of the outer sleeve, creating an intimate twist-proof bond between the rubber and the outer sleeve.

If the elastomeric bearing is integrated in a chassis part, for example by injection molding, a cohesive bond is likewise produced between the injection-molded plastic and the outer sleeve and a better adhesion in the chassis part is ensured by the replastication of the outer sleeve via the temperature input. Through the slots in the outer sleeve a stress relief after vulcanization is realized, and it is a biasing or calibration of the rubber bearing during pressing or molding in the tool, either by the cavity pressure in the cavity or by the closing of the tool allows.

The invention will be explained in more detail with reference to embodiments and accompanying drawings. Show it:

1 an injection-molded steering arm (chassis component) with two bearing points and a strut connecting them, in the Bindenahtbereich four injected by 90 ° slivers are injected,

2 the top view according to 1 .

3 the cross section AA according to 2 .

4 3 shows a three-dimensional representation of an injection-molded link arm, in which a hollow profile made of sliver is arranged in the weld line region,

5 the top view according to 7 .

6 the cross-section according to 8th ,

7 a rubber bearing with an outer sleeve of wound sliver, which has longitudinal slots on the outer circumference,

8th a rubber bearing with an outer sleeve of wound sliver without longitudinal slots,

9 a bearing eye of a chassis part, which has a rubber bearing injected in plastic in the region of the weld line of the plastic, wherein in the region of the weld line these overlapping fiber ribbons are arranged.

1 shows a suspension strut in the form of an injection-molded steering arm 1 with two bearings 2 . 3 and a strut connecting them 4 , in whose area the weld line 5 four slivers offset by 90 ° each 6 are injected from strip-shaped sliver material, wherein the slivers comprise continuous fibers. The area of the weld line 5 is here approximately in the middle of the longitudinal extent of the strut 4 , The tie line 5 overlapping the slivers 6 in an embedding area 16 injected or molded and accordingly positioned in the tool, not shown.

Out 2 is removable, that the slivers 6 vertically over the weld line 5 in the between the campsites 2 . 3 extending strut 4 of the handlebar arm 1 are embedded, so that the fibers of the slivers, which are not apparent here, which are formed from endless yarns, in the direction of the longitudinal extension of the strut 4 are aligned.

In 3 are the cross section AA according to 2 and the detail B shown in the section AA. It can be seen again that the here strip-shaped slivers 6 on the four side areas of plastic 15 existing strut 4 are embedded and the fibers 6.1 essentially in the direction of the longitudinal extension of the strut 4 run. Two slivers each 6 are on two opposite sides of the strut 4 intended. According to an embodiment not shown may also be a different number of slivers 6 over the area of the weld line 5 extend. To the strut 4 closes on both sides to a storage location, in which case the one depository 2 is apparent. The strip-shaped slivers here are preferably made of band-shaped commercial fiber composite material cut, inserted into the injection mold in the region of the resulting weld line and then generates the component by an injection molding process, wherein the slivers are injected in the region of the resulting weld line in the component and reinforce this. Another variant of a handlebar arm 1 is in the 4 to 6 shown. This also has two bearings 2 . 3 between which there is a strut 4 extends. The strut has in the area of the indicated in dashed lines weld line 5 sliver 6 on, which in the way of out of a sliver 6 wound hollow profile 6.2 is formed and according to the cross section of the strut 4 (in the central region) has a quadrangular (here square) cross-section. The tubular semi-finished product of wound sliver is cut to the required length and inserted into the injection mold. Is the injection molding process with two tool-side injection openings, each in the area of a bearing 4 are provided, the flow fronts meet approximately in the middle of the longitudinal extent of the strut 4 on each other, causing the weld line 5 formed. This is the sliver 6 wound hollow profile 6.2 the area of the weld line across the strut 4 embedded and thus reinforces the area of the weld line.

The cross section of the strut is in the middle in the region of the hollow profile 6.2 made of solid material, on both sides of the solid material is followed by a cross section in the form of an H-profile, which extends to the bearings 2 . 3 extends.

The hollow profile 6.2 may also have a different cross-section (round, oval, etc.) corresponding to the shape of the cross-section of the strut 4 in the area of the weld line 5 pretends.

A chassis component in the manner of the aforementioned handlebar arm has a much higher load capacity than an injection-molded component / link arm without arranged in the region of the weld line slivers.

7 shows a rubber bearing 10 with an outer sleeve 11 made of wound sliver 6 , the outer circumference two longitudinal slots offset by 180 ° 12 and 8th a variant of the rubber camp 10 without longitudinal slots. The longitudinal slots 12 run here parallel to the longitudinal axis A of the rubber bearing 10 , In the outer sleeve 11 sits in both variants a rubber body 13 , Especially when using an outer sleeve 11 made of thermoplastic material with continuous fibers (wound fiber ribbons 6 ) is when encapsulating the rubber bearing 10 if this is injected into a chassis component as an insert, and thus during encapsulation of the outer sleeve 11 , a cohesive connection between the plastic melt and the bearing outer ring / outer sleeve 11 generated. In addition, by partially or completely replastating the plastic matrix of the fiber ribbons 6 the outer sleeve 11 roughened their surface, the adhesion to the plastic or the rubber body 13 additionally improved. The vulcanized rubber body 13 also forms a material connection or positive connection to the outer sleeve 11 ,

In the rubber body 13 sits in accordance 7 and 8th radially inside an inner sleeve 14 , which preferably consists of a metallic material or of wound sliver.

In the 7 on the outer circumference of the outer ring introduced longitudinal slots 12 serve for stress relief after vulcanization and allow preloading / calibration of the rubber bearing 10 when encapsulating in the tool or when pressing in the rubber mount 10 in a recess of a handlebar / handlebar arm or other suspension component.

According to 9 may be a chassis component, such as a handlebar arm 1 , one or more bearings 2 possess with a bearing eye, which is a plastic injected or pressed rubber bearing 10 has, in the area of the weld line 5 of the plastic 15 lying in the area of the weld line 5 these overlapping here are two slivers 6 to be ordered. When molding the rubber bearing 10 the plastic flows 15 in flow direction F (arrow direction), here from two directions around the rubber bearing 10 and the flow fronts meet on the opposite side of the injection port, not shown, and form the weld line 5 , In the area of the binding seam 5 is lower strength in conventional designs. This vulnerability "Bindenaht 5 "Is due to the two preformed slivers here 6 strengthened. The slivers 6 follow the curvature of the rubber camp 10 , radially outwardly overlap the area of the weld line 5 and are in a embedding area 16 inserted into the tool, not shown, and with in the plastic 15 embedded or encapsulated by this. As a result, a considerable increase in the load capacity can be achieved, so that there is no failure of the chassis component in the area of the weld line 5 more is recorded. In particular, the absorbable forces are many times higher when the fiber orientation of the sliver runs in the circumferential direction of the bearing eye.

By using the sliver 6 in the area of the weld line 5 is the tie line 5 reinforced, thus eliminating the vulnerability and significantly improves the strength properties. It is thereby possible to increase the cross-section of the component in the region of the weld line, which is reinforced with sliver, reduce and thereby save plastic and reduce the weight of the chassis component.

The sliver 6 existing outer sleeve 11 of the elastomeric bearing 10 also acts as reinforcement of the weld line during encapsulation 5 at the inner diameter of the bearing eye.

According to an embodiment not shown, it is also possible to reinforce a component produced by injection molding after its removal from the injection mold by sliver in the region of the weld line by means of a material connection, in particular a welding process. The sliver (s) should also overlap the weld line.

In addition to the reinforcement of a cross section in the region of a weld line, it is also possible to reinforce other areas of a component with the sliver, the sliver is integrated for example in the injection molding in the component or the desired area subsequently with the sliver by a material connection, preferably by a welding process is reinforced.

As a result, the cross section of, for example, strut-shaped components can be considerably reduced and thus material and weight can be saved without impairing the component properties (such as mechanical properties and strength properties).

There are many possible applications are possible in which injection-molded components in the field of weld line can be reinforced by sliver or profile and thus the load capacity of the component can be increased many times. A further advantage is that the cross-section of the component in the region in which the sliver is present, can be reduced accordingly. This makes it possible to reduce the space requirement and save material.

If, in a container or pressure vessel produced by injection molding or a component for a pressure vessel, the weld line is correspondingly reinforced by sliver, it is possible to considerably increase the pressure range of the pressure vessel.

LIST OF REFERENCE NUMBERS

1

control arm

2

depository

3

depository

4

strut

5

weld

6

slivers

6.1

fibers

6.2

hollow profile

10

Rubber bearing

11

outer sleeve

12

longitudinal slots

13

rubber body

14

inner sleeve

15

plastic

16

the embedding

A

longitudinal axis

F

flow 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

• DE 4021547 A1 [0002]
• WO 2006/119101 A1 [0003]
• DE 102011079654 A1 [0004]
• DE 69836028 T2 [0005]
• DE 102007041324 A1 [0006]
• DE 102011007390 A1 [0007]

Claims (7)

Component, in particular, chassis component such as chassis strut or link or elastomer bearing / rubber mount ( 10 ) with inner sleeve ( 14 ), Elastomer body / rubber body ( 13 ) and outer sleeve ( 11 ), characterized in that the component sliver ( 6 ), wherein - in the case of a main body of the component made of injection-molded plastic ( 15 ) with a binding seam ( 5 ) Sliver ( 6 ) in the area of the weld line ( 5 ) is arranged and / or - in a component in the form of an elastomeric bearing / rubber bearing ( 10 ) the outer sleeve ( 11 ) and / or inner sleeve ( 14 ) made of sliver ( 6 ) or sliver ( 6 ) and by vulcanizing integrally / cohesively or positively with the elastomeric body / rubber body ( 13 ) connected is. Component according to claim 1, characterized in that the sliver ( 6 ) is embedded in the component over its entire length and / or the entire circumference of the component. Component according to claim 1 or 2, characterized in that the sliver ( 6 ) is formed of fiber composite material with continuous fibers and a polymer matrix and strip-shaped or in the manner of a hollow profile ( 6.2 ) is trained. Component according to one of claims 1 to 3, characterized in that the sliver ( 6 ) is formed from strip-shaped semifinished product or from wound tubular semifinished product. Component according to one of claims 1 to 4, characterized in that the sliver ( 6 ) with its fibers ( 6.1 ) at an angle to the weld line level and this is overlapping embedded in a main body of the component by an injection molding process and / or that the sliver ( 6 ) the tie line ( 5 ) is applied overlapping on the base body. Component according to one of claims 1 to 5, characterized in that the component is a chassis component for a motor vehicle. Component according to claim 1, characterized in that it is designed in the form of an elastomer bearing and one of sliver ( 6 ) existing outer sleeve ( 11 ) and / or inner sleeve ( 14 ) has one or more slots on the outer and / or inner circumference which are parallel and / or at an angle to a longitudinal axis (A) of the elastomeric bearing / rubber bearing ( 10 ).

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