DE102008034772A1 - Force transmission device has composite material unit and force transmission unit placed in composite material unit, where force transmission unit has force transmission element and connecting unit - Google Patents

Abstract

The force transmission device has a composite material unit (10) and a force transmission unit (12) placed in the composite material unit. The force transmission unit has a force transmission element (14) and a connecting unit (16) connected with the force transmission element. The connecting unit has two plates (18,20), which are partly placed in layer structure in the composite material unit.

Description

The The invention relates to a force introduction device according to the preamble of claim 1

Out The prior art are force introduction devices with a preferably as a fiber composite structure formed composite unit and one in the composite unit at least partially introduced Force introduction unit known. Usually includes the force introduction unit is a force introduction element and a connected to the force application element connection unit. The Connection of the force introduction unit with the composite material unit is usually done by adhesion, such as Gluing, by adhesion, such as screwing or riveting, by positive engagement, such as metallic, in the composite material unit incorporated inserts trained connecting units, in which Force introduction elements are screwed, or by combinations of the individual principles.

at Bonding, however, is only the first fiber layer with the joining partner connected, the further power flow is represented by the resin matrix. This causes delamination at high loads can occur and thus the resin strength to the dimensioning Size is. For connections according to the traction principle, such as glands, come typical polymer creep effects to carry. So the surface pressure under a screw head for so-called relaxation processes, the so-called relaxing creep, in the polymer matrix, what a Reduction of the bolt preload and thus a deterioration the connection quality results. In conventional Insert joints becomes a metallic component in the fiber composite structure laminated and partially milled freely after the hardening process. At this surface is drilled and a thread in the Inserts cut. The disadvantage here, however, is the relative low surface area compared to the mass of the insert. So it may happen that local detachments occur and thus causing the shaker to shake loose.

From the utility model DE 91 15 292 U1 a generic force introduction device with a composite material unit and a force introduction unit is known. The force introduction unit comprises a connection unit designed as a plate and designed as a threaded sleeve or threaded bolt Krafteinleitungsele element. The relative to the sleeve or bolt cross-section substantially larger plate is attached to the embeddable end of the threaded sleeve or the threaded bolt via an adhesive connection, a welded joint, a solder joint, a riveted joint or a screw connection. The embedding of the end of the threaded sleeve or the threaded bolt with the plate in the composite unit is then possible by way of lamination, pouring, injection or insertion.

It The object of the invention is a force introduction device to create, with safe introduction of the force introduction unit in the composite material unit a good force into the composite material unit allows.

The The invention solves this problem by providing a Force introduction device with the features of the claim 1.

advantageous Embodiments and developments of the invention are specified in the dependent claims.

According to the invention the connection unit at least two plates, which at least partially in a layered structure in the composite material unit can be introduced are. Advantageously, this leads in layers Structure for a good introduction of force into the composite material unit, because several, preferably all layers of the composite material unit with the force introduction unit or the force introduction element are connected. As a result, the power flow takes place through the force introduction element in all layers of the composite unit, so that when large Loads of the force introduction device Delaminations of the composite unit safely avoidable.

In Embodiment of the force introduction device according to the invention is at least one plate of the connection unit in at least an edge region in the composite material unit can be introduced. hereby This results in a region of the force introduction unit, which is preferably suitable for the arrangement of the force introduction element. By special selection of the material of the connection unit, can a secure connection of the force introduction element with the connection unit respectively.

In a further refinement of the force introduction device according to the invention, the plates of the connection unit have different cross sections or base surfaces in respectively directly successive layers. Ideally, a plate is inserted per layer of the connection unit, the size or the cross section of these plates preferably being varied from layer to layer. Advantageously, this results in a multi-section connection. The overlapping overlapping of the panels with the layers of the composite unit results in a surface enlargement achieved, which prevents shaking loose the force introduction unit of the composite material unit.

It It is proposed that the force introduction device at least a composite material layer area of the composite material unit, at least one alternately with composite layers and plates constructed intermediate area and at least one with plates in layers constructed area of the force introduction unit comprises. Prefers is the force introduction element in the at least one plate with layers arranged area of the force introduction unit arranged. hereby may be due to a free-milling after a hardening process the force introduction unit are omitted, since the force introduction unit after introduction into the composite unit and the hardening process already accessible without free milling. Consequently becomes a mechanical weakening of the force introduction device safely avoided.

It It is suggested that the force application element over a clamp connection is connected to the connection unit. In Advantageously, this results in a simple and space-saving Possibility for secure connection of the force introduction unit with the composite unit.

Prefers is the force introduction element of a screw and with a formed the screw cooperating mother. In an advantageous way this results in the use of commercial and / or standardized components.

In An embodiment of the invention is the connection unit between a screw head of the screw and the nut can be clamped. It results in an advantageous manner to simple and inexpensive Type a precise adjustability of the clamping force of the clamp connection.

Further the at least two plates of the connection unit are made massive. Preferably, this results in a large surface area the to be introduced into the composite unit plates, which a loose shaking of the force introduction unit from the composite material unit is avoidable.

In Advantageously, there are at least two plates of the connection unit made of at least one metallic material. Execution the plates as metallic components prevented in an advantageous manner Make a creep of the plates as a result of the clamp connection. The Metallic plates endure those generated by the clamp connection Surface pressure without deformation, so that, for example a reduction in the bolt preload and thus a deterioration the quality of connection between the force introduction unit and composite unit is avoided.

It It is proposed that the composite material unit of a fiber composite consists. This material allows a good incorporation of Force introduction unit in the composite material unit. The force introduction unit is comprehensively enclosed by the fibers of the composite, so that a secure reception of the force introduction unit in the composite unit given is.

Of Further, it is suggested that the composite material unit is at least one component of a motor vehicle.

A advantageous embodiment of the invention is in the single Drawing shown and will be described below.

The single-figure shows a longitudinal section through an inventive Force introduction device in a schematic representation.

The force introduction device comprises a composite material unit 10 and one in the composite unit 10 at least partially introduced force introduction unit 12 , The force introduction unit 12 has at least one force introduction element 14 and one with the force introduction element 14 connected connection unit 16 on. The introduction of the force introduction unit 12 in the composite unit 10 takes place in the present embodiment by way of lamination, wherein also pouring, injecting, inserting or other, a person skilled in the seem appropriate technologies are conceivable.

In the present embodiment, it is the composite material unit 10 to a fiber composite, in particular a fiber composite plastic, which may also be other, one skilled in the appear appropriate materials or combinations of materials. A fiber composite plastic is a plastic that consists of reinforcing fibers Ver and a plastic matrix. The plastic matrix surrounds the reinforcing fibers bonded to the plastic matrix by adhesive or cohesive forces. The fiber composite plastic can be adapted by a suitable combination of fiber and matrix material to different applications. In particular, a suitable material may result for lightweight construction applications, for example in the automotive industry. The present composite material unit 10 is executed here as a component of a motor vehicle. The mechanical and thermal properties of a fiber composite plastic can be adjusted via a variety of parameters, wherein in addition to the combination of fiber and matrix material, for example, the Fiber angle or the order of the layers can be changed.

In order to provide a force introduction device, the safe introduction of the force introduction unit 12 in the composite unit 10 a good introduction of force into the composite material unit 10 allows, is proposed according to the invention that the connection unit 16 at least two plates 18 . 20 which at least partially in a layered structure in the composite material unit 10 can be introduced. Ie. every layer 26 . 28 the composite unit 10 becomes a plate 18 . 20 inserted or laminated. In the present embodiment, the plates 18 . 20 each having a circular cross-section, whereby further, to a person skilled in the appearing appropriate cross-sectional shapes, such as quadrangular or hexagonal, etc. are conceivable. Advantageously, about the cross-sectional shapes of the plates 18 . 20 Influence on a rotation lock of the force introduction unit 12 in the composite unit 10 be exercised. In particular, the respective plates 18 . 20 also have different cross-sectional shapes.

The plates 18 . 20 the connection unit 16 are in at least one border area 22 . 24 in the composite unit 10 einbringbar or einlaminierbar. Ie. the plates 18 . 20 can in the composite material unit 10 be incorporated. The plates 18 . 20 the connection unit 16 have in each case directly successive layers on different cross-sections, so that in the present embodiment, a plate 18 with smaller circle diameter itself with a plate 20 alternates with larger circle diameter. This results in a layered structure, which at the edge regions of the plates 18 . 20 Free spaces between the plates 18 . 20 for introducing the material of the composite unit 10 leaves. This leads to a better anchoring of the force introduction unit 12 in the composite unit 10 , allowing a shaking of the force introduction unit 12 is avoided even at high loads.

The layered structure of the force introduction device results in at least one with composite material layers 26 . 28 built-up area 30 the composite unit 10 , at least one alternately with layers of composite material 26 and plates 20 constructed intermediate area 32 and at least one with plates 18 . 20 Layered area 34 the force introduction unit 12 ,

The force introduction element 14 is in the at least one with plates 18 . 20 Layered area 34 the force introduction unit 12 arranged. Preferably, the force introduction element 14 via a clamping connection with the connection unit 16 connected. In the present embodiment, the force introduction element 14 from a screw 36 and one with the screw 36 interacting mother 38 educated. The connection unit 16 or the plates 18 . 20 are between a screw head 44 the screw 36 and the mother 38 clamped, preferably between the screw head 44 and the top plate 18 and the mother 38 and the bottom plate 18 one washer each 40 . 42 is arranged.

Preferably, the at least two plates 18 . 20 the connection unit 16 solid executed. Preferably consisting of the plates 18 . 20 the connection unit 16 from at least one metallic material, although other materials or combinations of materials which appear appropriate to a person skilled in the art are also conceivable.

10

Composite unit

12

Force transmission unit

14

Force application element

16

connecting unit

18

plate

20

plate

22

border area

24

border area

26

Composite material layer

28

Composite material layer

30

Area (Composite unit)

32

intermediate area

34

Area (Force-introduction unit)

36

screw

38

mother

40

washer

42

washer

44

screw head

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 9115292 U1 [0004]

Claims (12)

Force introduction device with a composite material unit ( 10 ) and one in the composite unit ( 10 ) at least partially introduced force introduction unit ( 12 ), the at least one force introduction element ( 14 ) and one with the force introduction element ( 14 ) connected connection unit ( 16 ), characterized in that the connection unit ( 16 ) at least two plates ( 18 . 20 ), which at least partially in a layered structure in the composite material unit ( 10 ) can be introduced. Force introduction device according to claim 1, characterized in that at least one plate ( 20 ) of the connection unit ( 16 ) in at least one edge region ( 22 . 24 ) into the composite unit ( 10 ) can be introduced. Force introduction device according to claim 1 or 2, characterized in that the plates ( 18 . 20 ) of the connection unit ( 16 ) in each immediately successive layers have different cross-sections. Force introduction device according to one of claims 1 to 3, characterized by at least one layer of composite material ( 26 . 28 ) constructed area ( 30 ) of the composite unit ( 10 ), at least one alternately with composite layers ( 26 ) and plates ( 20 ) built intermediate area ( 32 ) and at least one with plates ( 18 . 20 ) layered area ( 34 ) of the force introduction unit ( 12 ). Force introduction device according to one of claims 1 to 4, characterized in that the force introduction element ( 14 ) in the at least one with plates ( 18 . 20 ) layered area ( 34 ) of the force introduction unit ( 12 ) is arranged. Force introduction device according to one of claims 1 to 5, characterized in that the force introduction element ( 14 ) via a clamping connection with the connection unit ( 16 ) connected is. Force introduction device according to one of claims 1 to 6, characterized in that the force introduction element ( 14 ) of a screw ( 36 ) and one with the screw ( 36 ) cooperating mother ( 38 ) is formed. Force introduction device according to claim 7, characterized in that the connection unit ( 16 ) between a screw head ( 44 ) of the screw ( 36 ) and the mother ( 38 ) can be clamped. Force introduction device according to one of claims 1 to 8, characterized in that the at least two plates ( 18 . 20 ) of the connection unit ( 16 ) are made massive. Force introduction device according to one of claims 1 to 9, characterized in that the at least two plates ( 18 . 20 ) of the connection unit ( 16 ) consist of at least one metallic material. Force introduction device according to one of claims 1 to 10, characterized in that the composite material unit ( 10 ) consists of a fiber composite. Force introduction device according to one of claims 1 to 11, characterized in that it is in the composite material unit ( 10 ) is at least one component of a motor vehicle.