DE102017212350A1 - Blind rivet nut and component assembly with blind rivet nut - Google Patents

Abstract

The invention relates to a blind rivet nut (10) with a setting head (11) and a shank (12) having a deformation section (16) which is screwed into an internal thread (15) of the blind rivet nut (10) by screwing a screw (7) into a closing head (10). 18) is plastically deformable. At the blind rivet nut (10) in the direction of the shaft (12) elastically deformable Verliersicherungsteil (20) is arranged for non-positive and / or positive locking of the blind rivet nut in a through hole of a component. Furthermore, a component composite (1) with a first component (2), a second component (5) and a blind rivet nut (10) is specified.

Description

The invention relates to a blind rivet nut and a composite component with blind rivet nut.

Blind rivet nuts usually have a setting head and a molded-on shaft with a deformation portion which is deformable by screwing a spindle into an internal thread of the blind rivet nut to a closing head. Blind rivet nuts are often used when a screw connection with a thin-walled component is desired in which no thread can or should be cut. A fastening unit with a blind rivet nut and a screw is for example from the DE 10 2007 009 616 B4 known.

Setting the blind rivet nut is similar to setting a blind rivet. The blind rivet nut is inserted into a through hole of a first component until the setting head abuts an upper side of the component. The shaft protrudes through the component. A spindle is screwed from the side of the setting head into the internal thread of the blind rivet nut. By tightening the spindle, an axial tensile force is applied to the shaft, so that deforms the deformation portion and on the opposite side of the setting head of the first component forms a closing head. As a result, the blind rivet nut is positively connected to the first component.

Subsequently, a composite component can be produced by a second component is positioned with a through hole in alignment with the blind rivet nut and a screw is screwed into the through hole of the second component in the blind rivet nut.

To set the blind rivet nut special installation tools are necessary and a separate step in which high setting forces must be applied.

It is the object of the present invention to provide a blind rivet nut and a composite component, which is improved in terms of mountability.

The object is achieved by a blind rivet nut according to claim 1 and a composite component according to claim 7. Further advantageous embodiments will be apparent from the dependent claims and the description below.

In accordance with the invention, a captive securing part which is elastically deformable in the direction of the shaft is arranged on the blind rivet nut for frictionally and / or positively locking the blind rivet nut in a through hole of a component.

If such a blind rivet nut is inserted into a correspondingly designed through hole of a component, then the captive securing part fixes the blind rivet nut in the component and prevents the blind rivet nut from falling out unintentionally. It is no longer necessary to fix the blind rivet nut first by forming the closing head in the component before a second component can be screwed on. This makes it possible to dispense with a process step in the assembly process. Advantageously, the closing head can be formed by screwing the second component to the blind rivet nut. When screwing in the screw for mounting the second component, the required setting force is then applied by which deforms the deformation portion of the shaft plastically and permanently to the setting head. In addition to saving time by saving a mounting step and the total forces to be applied by the fitter are reduced. In addition, no separate setting tool is required - the blind rivet nut can be inserted by hand into the first component, whereby the required working surface can be reduced.

The captive securing part can frictionally fix the blind rivet nut in the first component, e.g. when the captive protection part is formed in the manner of a sealing ring circumferentially around the shank of the blind rivet nut. By pressing the blind rivet nut into the through hole, such a captive securing part is compressed and fixes the blind rivet nut in a force-locking manner against falling out in the first component.

However, an embodiment in which the captive securing part is designed as a latching element in such a manner that it locks with the first component when the blind rivet nut is inserted into the through hole in the first component is particularly preferred.

In a particularly preferred embodiment, the captive securing part has at least two latching arms projecting obliquely away from the shaft and radially elastically yielding with outwardly pointing latching cams. When pushing the shaft through a through hole in the component, the latching arms are pressed inwards in the direction of the shaft. Due to their elastic configuration, they then spring outwards, as a result of which the locking cams engage behind the passage opening and engage with the component.

The setting head and the shaft are preferably in one piece and designed as a metal part, in particular as a steel part. The blind rivet nut has an internal thread in the shaft, in which of Pages of the setting head a screw is screwed. Between setting head and internal thread part of the shaft is formed as a deformation section. In the deformation section, the strength of the shaft is reduced. This can be achieved, for example, by a thinner wall thickness than in the remaining shaft area. The use of a rivet nut made of metal and in particular steel (with a corresponding screw made of metal / steel) guarantees a high achievable strength of the screw connection.

The captive securing part is preferably fastened captively to the blind rivet nut as a separate component. This can be achieved for example by a positive or cohesive connection of blind rivet nut and captive safety part.

Preferably, the captive securing part is a plastic part, which can be produced particularly inexpensively. For example, the loss-securing part can be molded directly onto the blind rivet nut via an injection molding process.

Particularly preferably, the captive securing part surrounds the setting head in a form-fitting manner. This allows a secure connection between captive and blind rivet nut, which is easy to produce, especially if the captive safety part is made of plastic.

To realize an anti-rotation in the component, it may be advantageous if the shaft is formed on its outer surface as a polygon, preferably as a hexagon or octagon. The through hole in the first component then preferably has a shape corresponding to the outer surface of the shaft, whereby the blind rivet nut is already fixed in a form-fitting manner against twisting in the component after insertion.

Furthermore, a component composite is specified with a first component, a second component and a blind rivet nut, in which the first component is fixed in a form-fitting manner at a through hole between the setting head and a closing head of the blind rivet nut. The second component is connected to the first component via a screw screwed into the blind rivet nut. According to the invention a Verliersicherungsteil is arranged on the setting head, which provides a positive and / or positive connection between the first component and the blind rivet nut. Such a component connection is particularly quick and easy to manufacture, as can be dispensed with a separate assembly step for forming the setting head and this can be integrated into the process step of screwing the second component.

A reliable fixation of the blind rivet nut in the first component waiving a separate assembly tool is preferably achieved in an embodiment in which the captive on the side of the shaft has at least two radially elastically resilient latching arms with outwardly facing locking cams, which by two guide grooves of the through hole in the first Pass through the component and are locked on a side facing away from the setting head of the blind rivet nut with the first component. Such a component connection is easy to produce, since the blind rivet nut is locked by insertion into the through hole on the first component and held in a form-fitting manner in this.

The length of the locking lugs is chosen such that they pass through the first component and lock with their locking cams on the surface of the first component. A special strength of the connection between the blind rivet nut and the first component is achieved in one embodiment in that the closing head is formed at the level of the locking cams and presses them radially outward.

The blind rivet nut according to the invention is particularly suitable for thin-walled components. Due to the improved mountability, it is particularly suitable for use in mass production, e.g. for the assembly of motor vehicle components. In one embodiment, the components of the component composite motor vehicle components and in particular body or chassis components.

For the component composite, the above-described blind rivet nut with the anti-loss part is preferably used, whereby the same advantages and technical effects described there are achieved.

The above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood with reference to the drawings and in conjunction with the following description of the embodiments. If the term "can" is used in this application, it is both the technical possibility and the actual technical implementation.

• 1 eine Schnittansicht einer beispielhaften Blindnietmutter
• 2 eine Schnittansicht einer beispielhaften Bauteilverbindung unter Verwendung der Blindnietmutter aus 1
• 3 das Ausbilden der Bauteilverbindung zu verschiedenen Zeitpunkten

Embodiments will be explained below with reference to the accompanying drawings. Show:

• 1 a sectional view of an exemplary blind rivet nut
• 2 a sectional view of an exemplary component connection using the blind rivet nut 1
• 3 forming the component connection at different times

1 shows an exemplary blind rivet nut 10 in a sectional view. The exemplary blind rivet nut is a metal part.

The blind rivet nut has a setting head 11 and a shaft integrally formed thereon 12 on. The blind rivet nut 10 is along its longitudinal axis L with a passage opening 13 Mistake. In a free end of the shaft 12 facing portion is the through hole as an internal thread 14 educated. The passage opening 13 is designed such that from the side of the setting head 11 from a screw, not shown in the internal thread 14 can be screwed. In order to facilitate the deformation of the shaft and to control specifically in the formation of a closing head described below, is the wall thickness of the shaft 12 in a between internal thread 14 and set head 11 arranged deformation section 16 reduced compared to the remaining stem wall thickness.

To simplify the assembly of the blind rivet nut 10 is at this a captive part 20 arranged. The captive securing part is preferably designed as a plastic part and, for example, by injection molding to the blind rivet nut 10 formed. The captive protection part 20 grasps the setting head 11 positive locking, so that it is captive on the blind rivet nut 10 is fixed.

The captive protection part 20 has two mutually opposite latching arms 22 up, extending from one to the setting head 11 adjacent shaft portion in the direction of the free end and obliquely from the shaft 12 extend away. The latch arms 22 each end in a pointing away from the shaft locking cams 24 , The length of the locking arms 22 and the size and location of the locking cams 24 is chosen depending on the component to which the blind rivet nut 10 should be mounted.

2 shows the procedure during assembly of the blind rivet nut 10 for the formation of a component composite 1 , First, a first component 2 provided with a through hole 3 into which the shaft 12 the blind rivet nut 10 is inserted through. Here are the locking arms 22 of the captive security part 20 with through the through hole 3 plugged.

For mounting the blind rivet nut 10 has the through hole 3 essentially the outer shape of the shaft 12 on, in the example shown, the shape of a hexagon. To insert and engage the locking arms 22 to allow, is the through hole 3 furthermore with two additional grooves or guide grooves 4 Mistake. The guide grooves 4 bend the latch arms 22 when inserting, first inwards towards the shaft 12 , When the locking cams 24 on the opposite side from the first component 2 emerge, spring the locking arms 22 elastically outward back, with the locking cams 24 the first component 2 behind and so the blind rivet nut 10 positive fit in the first component 2 fix.

Preferably, the latching arms cause 22 a permanent connection between blind rivet nut 10 and the first component 2 , By this is meant that the blind rivet nut 10 by train against the insertion only under damage of the first component 2 or the captive protection part 20 from the first component 2 is removable.

Through the locking cams 24 becomes the blind rivet nut 10 securely held in the first component. Therefore, the through hole can 3 be formed so large that the blind rivet nut 10 can be inserted without much effort.

The attachment of a second component 5 takes place from the side of the setting head 11 , This is the second component 5 initially with a passage opening 6 in alignment with the blind rivet nut 10 arranged and it will be a screw 7 through the passage opening 6 in the second component 5 in the internal thread 15 the blind rivet nut 10 screwed. By tightening the screw 7 becomes the second component 5 on the set head 11 the blind rivet nut 10 pulled, and on further tightening deforms the deformation section 16 of the shaft 12 under formation of a closing head 18 so the blind rivet nut 10 positive fit of setting head 11 and closing head 18 on the first component 2 is held.

During this setting movement, the forces to be applied by the installer are reduced because the blind rivet nut 10 from the crab arms 22 or the captive protection part 20 in the first component 2 being held.

3 shows the resulting component connection in a partial sectional view. The closing head 18 lays down from the setting head 11 side facing away from the first component 2 at. A particularly fast and high strength of the connection is achieved by the fact that the closing head 18 due to suitable dimensioning of the shaft 12 at the height of the locking cam 24 forms and pushes them outwards, whereby an additional fixation is given.

The embodiments are not to scale and are not restrictive. Modifications in the context of expert action are possible. In particular, the Verliersicherungselement can also have more than two locking arms or locking cams in a different form.

LIST OF REFERENCE NUMBERS

1

component composite

2

first component

3

Through Hole

4

guide

5

second component

6

Through opening

7

screw

10

blind rivet nut

11

setting head

12

shaft

13

Through opening

14

inner thread

16

deforming section

18

closing head

20

loosening

22

detent arm

24

locking cams

L

longitudinal axis

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 102007009616 B4 [0002]

Claims (10)

Blind rivet nut (10) with a setting head (11) and a shank (12) with a deformation portion (16) by screwing a screw (7) in an internal thread (15) of the blind rivet nut (10) to a closing head (18) plastically deformable is, characterized in that on the blind rivet nut in the direction of the shaft (12) elastically deformable Verliersicherungsteil (20) is arranged for non-positive and / or positive locking of the blind rivet nut in a through hole of a component. Blind rivet nut (10) after Claim 1 , wherein the captive securing part (20) is designed as a latching element. Blind rivet nut (10) according to one of the preceding claims, wherein the anti-loss part (20) at least two, obliquely from the shaft (12) wegstehende latching arms (20) with outwardly facing locking cam (24) which are radially resiliently yielding towards the shaft , Blind rivet nut after Claim 1 , wherein the setting head (11) and the shaft (12) are formed as a metal part and the captive securing part (20) is a plastic part. Blind rivet nut after Claim 4 , wherein the captive securing part (20) engages around the setting head (11) in a form-fitting manner. Blind rivet nut according to one of the preceding claims, wherein the shaft (12) is formed on its outer surface as a polygon. Component assembly comprising a first component (2), a second component (5) and a blind rivet nut (10), in particular a blind rivet nut according to one of Claims 1 to 6 in which the first component (2) is fixed in a form-fitting manner at a through hole (3) between a setting head (11) and a closing head (18) of the blind rivet nut (10) and the second component (5) is inserted into the blind rivet nut (10) via a screwed screw (7) is connected to the first component (2); characterized in that on the setting head (11) a captive securing part (20) is arranged, which provides a non-positive and / or positive connection between the first component and blind rivet nut. Component group after Claim 7 in which the captive securing part (20) has on the side of the shank (12) at least two radially elastically yielding latching arms (20) with outwardly pointing latching cams (24) which are formed by two guide grooves (4) of the through-hole (3) in the first component (FIG. 2) and on a the setting head (11) of the blind rivet nut (10) facing away from the first component (2) are locked. Component group after Claim 8 , wherein the closing head (11) is formed at the level of the locking cams (24) and presses them radially outward. Component composite according to one of Claims 7 to 9 , wherein the components (2, 5) are motor vehicle components.

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