EP2088645A2 - Fastening system - Google Patents
Fastening system Download PDFInfo
- Publication number
- EP2088645A2 EP2088645A2 EP08012084A EP08012084A EP2088645A2 EP 2088645 A2 EP2088645 A2 EP 2088645A2 EP 08012084 A EP08012084 A EP 08012084A EP 08012084 A EP08012084 A EP 08012084A EP 2088645 A2 EP2088645 A2 EP 2088645A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fastening system
- nut
- component
- bolt
- radial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/304—Clamped connections, spring connections utilising a screw or nut clamping member having means for improving contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/34—Conductive members located under head of screw
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
Definitions
- the present invention relates to a fastening system for fastening an electrically conductive component, having a provided with an electrically insulating layer, a Bolzenfuß and a bolt shank having, the component receiving threaded bolt.
- the present invention is concerned with the problem by means of a threaded bolt an electrically conductive connection between an electrically conductive member and another workpiece on which the threaded bolt is arranged electrically conductive to produce.
- This problem occurs in particular in the automotive industry, wherein it is the workpieces to body parts, which are provided with the threaded bolts and then painted, after painting the electrically conductive connection, for example, must be made to a cable lug.
- the German Utility Model G 93 12 678 U1 discloses a method which is common in the automotive industry. Bolts bolted with bolts are supplied, which are welded to the body parts and painted together with them. Then the cap nut is unscrewed, the respective cable lug attached and screwed the cap nut again, the cable lug is attached. The cap nut prevents during the painting that the bolt shaft is covered with an electrically insulating paint layer, which would prevent the electrically conductive contact between the body part and cable lug.
- such a method is time-consuming and expensive and therefore expensive.
- the "paint scratch nut” acts like a tap in this process, which poses the further problem that the bolt thread over its entire length, so from the tip to the bolt foot, scraped. Thus, the corrosion protection at the exposed tip and the exposed threads of the bolt shaft is lost, so that it must be covered with a cap or cap nut. This leads to a higher weight and rising costs.
- the object of the present invention is therefore to develop a generic fastening system such that a reliable and durable electrical contact with the least possible effort can be achieved.
- the fastening system comprises means which are arranged on the bolt shank in the region of the bolt foot cooperating with a nut and / or provided on the component, and that or the means penetrate the electrically insulating layer of the threaded bolt exclusively in the region of the bolt foot and cause electrical contact between the threaded bolt and the component.
- the inventive idea is therefore that the bolt shaft, which is fastened to a workpiece in an electrically conductive manner, is painted together with the workpiece and means are provided which ensure that the bolt shaft is scraped off only in the region of the bolt foot in order to restore the paint layer in this area remove and produce the electrically conductive connection between the workpiece and component reliably and permanently.
- this inventive concept can be realized by means of two different, equally effective approaches.
- the first approach is that a nut is provided which cooperates with a means located in the region of the bolt foot on the bolt shank to remove the lacquer layer in this area.
- the second approach is that the component itself has means that are part of the fastening system according to the invention and remove the paint layer in the region of the bolt foot. A mother does not necessarily exist.
- the fastening system according to the invention thus consists of components that can be manufactured and assembled inexpensively with little effort and therefore.
- the complicated unscrewing and re-screwing a cap nut after the painting process is eliminated.
- the producible with the fastening system according to the invention electrical connection is reliable and durable.
- the lacquer layer on the upper, after assembly usually exposed area of the bolt shaft remains undamaged, so that it acts as an insulating and corrosion protection layer and the bolt shaft no longer needs to be covered as in the prior art with a cap or cap nut.
- the first approach of the present invention in which a nut is provided which cooperates with a means arranged in the region of the bolt foot on the bolt shank, can, for example, be realized in that the means arranged on the bolt shank means is designed as a radial widening, with a radial Recess cooperates in the mother whose inner diameter is smaller at least one surface area than the outer diameter of the radial broadening.
- the bolt shank is thus widened in the area of the bolt foot.
- the nut is provided with a corresponding radial recess, which surrounds the radial widening during assembly. Due to the undersize, the lacquer layer is scraped off from the widened region and the electrical contact surface is exposed.
- both nut and bolt are particularly simple and inexpensive to manufacture.
- the radial recess in the nut may be interrupted by at least one vertical groove, so that the vertical edges of the groove act as scraper elements relative to the radial widening and thus expose the electrical contact surface.
- Particularly suitable are two or more, in particular evenly distributed around the circumference of the radial recess grooves. With this design, in particular the scraping torque can be reduced or the desired preload force can be reliably achieved.
- the radial broadening of the bolt shank can be designed in many ways to achieve the effect described above, for example. Out of round, knurled, polygonal or round. A particularly easy-to-manufacture embodiment of the radial broadening is the training as a circumferential collar. In a comparable manner, the radial recess in the nut can also be designed in different ways to achieve the described effect, for example, out of round, toothed or cylindrical.
- the diameter of the internal thread of the nut is greater than the diameter of the external thread of the bolt shaft. This ensures particularly reliably that regardless of the thickness of the paint layer in an individual case, this remains intact when screwing the nut in the threaded portion of the bolt shaft and forms a reliable corrosion protection.
- the component can be rotatably and captively connected to the mother.
- the component may, for example, have an opening, on the inside of which at least two axially extending retaining tabs are formed, which engage in a circumferential undercut in the nut.
- the component may also have at least two holding elements which engage around a peripheral collar provided on the nut or engage in a circumferential depression provided on the nut.
- the component may also have a peripheral bead, which engages around the encircling collar or engages in the circumferential recess.
- the second approach of the present invention in which the component itself has means which are part of the fastening system according to the invention and remove the paint layer in the region of the bolt foot, can, for example, be realized in that the means provided on the component than at the inside of an opening arranged, at least two claws are formed, which protrude radially into the opening, and that the clear width between the free ends of the claws is at least as large as the diameter of the bolt shaft in the region of the bolt foot. It follows that during the assembly of the component, the claws in the area of the bolt foot scrape along the thread of the bolt shaft. Since the component is received by the bolt shaft with its opening prior to assembly and essentially rests on the bolt foot, the paint layer on the bolt shaft remains undamaged in its upper region.
- the assembly can be done with any suitable tool, eg. Mounting wrench, wrench, etc. Since the claws are wedged after the assembly process with the thread, it is not absolutely necessary to provide an additional nut for mounting the component on the threaded bolt, since the component automatically is held reliably on the bolt.
- the use of a nut, for example as an assembly tool, is at the discretion of the user.
- modifications with regard to the claw shape, the material combination of component, claws and bolt shank and the strength of the materials used in each case are conceivable, so that this embodiment of the fastening system according to the invention allows a particularly wide range of variations in terms of their physical properties.
- the free ends of the claws are preferably aligned above the component in the direction of the bolt shaft. As a result, they are pressed particularly far down and in the attachment process and thus pressed particularly firmly into the thread of the bolt shaft.
- the shape of the claws can be chosen freely and is at the discretion of the person skilled in the art.
- the claws may be approximately S-shaped or Z-shaped in cross-section. But they can also be formed straight, which allows a particularly simple production.
- the bolt shank can have a radial widening, which cooperates with the claws for producing the electrical contact between the threaded bolt and the component.
- the radial broadening can be formed with or without thread.
- recesses may be provided in the radial broadening to assist the wedging of the claws and so to obtain a particularly strong connection between the bolt shank and the component, which makes an additional backup, for example, by a mother dispensable.
- the radial broadening may be formed as a circumferential collar.
- the component in which the component itself has means which are part of the fastening system according to the invention and remove the paint layer in the region of the bolt foot, the component can also be rotatably and captively connected to a nut, if desired becomes.
- the component may have at least two holding elements, which surround a nut provided on the circumferential collar or engage in a provided on the mother, circumferential recess.
- the component may in particular have a fork-shaped, the bolt shank encompassing contact surface, which is easy to manufacture and is particularly easy to connect with the bolt shank.
- the component is preferably designed as a cable lug, in particular for use in the automotive industry.
- FIG. 1 shows an embodiment of a fastening system 10 according to the invention, which is also referred to as "ground pin” and here serves to bring a cable lug 50 into electrical contact with a workpiece 40, for example.
- the fastening system 10 has a threaded bolt 11 which has a bolt shank 12 and a bolt foot 13.
- the threaded bolt 11 is electrically connected with its bolt foot 13 to the workpiece 40, for example. Welded.
- On the threaded bolt 11 is screwed as a further component of the fastening system 10, a nut 14.
- the nut 14 serves to hold the cable lug 50 on the Bolzenfuß.
- the threaded bolt 11 is fixed without the nut 14 on the body part 40. Subsequently, the body is painted together with the threaded bolt 11. Then the cable lug 50 is mounted and held by screwing the nut 14. The electrical contact between the cable lug 50 and the body part 40 must therefore extend from the cable lug 50 via the nut 14 from the nut thread to the bolt thread and over the bolt foot 13 into the body part. For this purpose, the paint layer has to be at least partially removed again from the bolt shank 12.
- the fastening system 10 according to the invention is characterized in that the end of the bolt shaft 12 is exposed, that is not covered with a cap or cap nut.
- FIG. 2 shows a first solution principle for the construction of the fastening system 10 according to the invention.
- the threaded bolt 11 and the nut 14 cooperate in such a way that the paint layer is only removed in the region of the bolt foot 13 on the bolt shank 12.
- Other forms of radial broadening 15 are of course also conceivable, for example.
- the nut 14 is provided with a radial recess 16 formed in such a way that the described purpose is achieved, for example, cylindrical, non-round or serrated.
- the inner diameter of the radial recess 16 is smaller than the outer diameter of the radial widening 15 at at least one surface area.
- the radial recess 16 thus cooperates with the radial widening 15 such that its inner surface 17 acts like a scraping surface with respect to the outer surface of the radial widening 15 acts, leaving only in a selected area of the bolt shaft 12, namely in the vicinity the bolt foot 13, the paint layer is at least partially removed again and via a contact surface 18, an electrically conductive contact between the bolt shaft 12 and the nut 14 is made.
- the radial recess 16 can be provided with at least one, preferably two or more vertical grooves 25 are provided whose vertical edges 26 act as scraping edges against the surface of the radial widening 15. Furthermore, it is advantageous if the diameter of the internal thread of the nut 14 is greater than the diameter of the external thread of the bolt shaft 12.
- the dimensions of the fastening system 10 according to the invention selected substantially independently of the thickness of the paint layer in each case and both the ease of screw connection as well as the integrity of the protective lacquer layer in the upper region of the threaded bolt 12 are particularly easy to be guaranteed.
- FIG. 3 shows a fastening system 10, which also the above in FIG. 2 realized first solution principle realized.
- the component 50 in the embodiment of the cable lug, rotatably and captively held on the nut 14.
- at least two axially extending retaining tabs 52 are formed on the inside of the opening 51 of the cable lug 50.
- the nut 14 is provided with a circumferential undercut 19, in which the retaining tabs 52 engage.
- FIG. 4 shows a second solution principle for the construction of the fastening system according to the invention 10.
- the component 50 in the embodiment of the cable lug, so cooperates with the threaded bolt 11, that the paint layer is removed only in the region of the bolt foot 13 on the bolt shank 12.
- the cable lug 50 which is held in the assembled state in the region of the Bolzenfußes 13, ie in the embodiment above the Bolzenfußes 13, provided on the inside of its opening 51 with at least two arbitrarily shaped, rectilinear in the embodiment in cross section, claws 21, the protrude radially into the opening.
- the clear width between the free ends of the claws 21 is dimensioned such that when mounting the cable lug 50, ie when screwing the nut 14, the claws 21 cooperate with the bolt shank 12 in such a way that only in the selected area of the bolt shank 12, in the vicinity of the bolt foot 13, the lacquer layer is at least partially removed again and an electrically conductive contact between the bolt shank 12 and the component 50 is produced via contact surfaces 22.
- the lacquer layer on the remaining area of the bolt shaft 12 remains undamaged, especially in the area of the bolt thread, in particular at the exposed end of the bolt shaft 12.
- the claws 21 are bent at an angle from the plane of the opening 51 in the direction of the nut 14 so that their free ends are above the opening 51 of the cable lug 50.
- the clear width between the free ends of the claws 21 is at least as large as the diameter of the bolt shaft 12 in the region of the bolt foot.
- a tool 30 (in FIG. 4 dash-dotted line shown) are used, which is screwed onto the bolt shank 12, while the claws 21 as described schabend pressed into the threads of the bolt shank 12 and then unscrewed again.
- a sleeve-shaped, the bolt encompassing tool is used, with which the claws 21 are depressed, which press as described schabend into the threads of the bolt shaft 12.
- FIG. 5 shows a fastening system 10, which also the above in FIG. 4 realized second solution principle realized.
- the bolt shank 12 is provided with a radial widening 15, as already described in relation to FIG FIG. 2 has been described.
- the light Width of the claws 21 is dimensioned so that they interact during assembly with the radial widening 15 such that the described contact surfaces 22 are formed.
- FIG. 5 shows a particularly preferred embodiment of the radial widening 15, the recesses 23, for example. Recesses, in the embodiment, a circumferential groove, in which the claws 21 can be wedged during assembly.
- the recesses 23 thus act similar to the threads of the bolt shaft 12 and can therefore be of any desired shape, as long as they have this property.
- FIG. 6 shows a fastening system 10, which also the above in FIG. 4 realized second solution principle realized.
- the component 50 in the embodiment of the cable lug, rotatably and captively held on the nut 14.
- at least two axially extending holding elements 53 are formed on the cable lug 50, which surround the nut 14 in the manner of a flanging.
- the nut 14 is provided in the exemplary embodiment with a circumferential collar 20.
- a circumferential recess may be provided on the nut 14, in which the holding elements 53 engage (not shown).
- a circumferential bead can also be provided in a manner known per se, which engages around the collar 20 formed on the nut 14 or engages in the peripheral recess (not shown) formed on the nut 14.
- FIG. 7 shows an embodiment of a component 50 for use with the fastening system according to the invention.
- the component 50 in the exemplary embodiment, a cable lug, is characterized by a fork-shaped contact surface 54, which is suitable and determined is to encompass the bolt shank 12. Such a component can be mounted particularly easily.
- the contact surface 54 is provided with claws 21, according to the in FIG. 4 shown second solution principle of the present invention.
- FIG. 8 shows a further embodiment of a nut 14 for a fastening system according to the invention, which realizes the first solution principle (see. FIG. 2 ).
- the nut 14 is provided with the described radial recess 16.
- the radial recess 16 has four vertical grooves 25 whose vertical edges 26 act as scraping edges with respect to the surface of the radial widening 15.
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- Connection Of Plates (AREA)
- Bolts, Nuts, And Washers (AREA)
- Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein Befestigungssystem zur Befestigung eines elektrisch leitenden Bauteils, mit einem mit einer elektrisch isolierenden Schicht versehenen, einen Bolzenfuß und einen Bolzenschaft aufweisenden, das Bauteil aufnehmenden Gewindebolzen.The present invention relates to a fastening system for fastening an electrically conductive component, having a provided with an electrically insulating layer, a Bolzenfuß and a bolt shank having, the component receiving threaded bolt.
Die vorliegende Erfindung beschäftigt sich mit dem Problem, mittels eines Gewindebolzens eine elektrisch leitende Verbindung zwischen einem elektrisch leitenden Bauteil und einem weiteren Werkstück, an welchem der Gewindebolzen elektrisch leitend angeordnet ist, herzustellen. Dieses Problem tritt insbesondere im Automobilbau auf, wobei es sich bei den Werkstücken um Karosserieteile handelt, die mit den Gewindebolzen versehen und anschließend lackiert werden, wobei nach dem Lackieren die elektrisch leitende Verbindung bspw. zu einem Kabelschuh hergestellt werden muss.The present invention is concerned with the problem by means of a threaded bolt an electrically conductive connection between an electrically conductive member and another workpiece on which the threaded bolt is arranged electrically conductive to produce. This problem occurs in particular in the automotive industry, wherein it is the workpieces to body parts, which are provided with the threaded bolts and then painted, after painting the electrically conductive connection, for example, must be made to a cable lug.
Das deutsche Gebrauchsmuster G 93 12 678 U1 offenbart ein Verfahren, das in der Automobilindustrie gebräuchlich ist. Hierbei werden mit Hutmuttern verschraubte Bolzen geliefert, die an den Karosserieteilen angeschweißt und gemeinsam mit diesen lackiert werden. Anschließend wird die Hutmutter abgeschraubt, der jeweilige Kabelschuh angebracht und die Hutmutter wieder aufgeschraubt, wobei der Kabelschuh befestigt wird. Die Hutmutter verhindert während des Lackiervorgangs, dass der Bolzenschaft mit einer elektrisch isolierenden Lackschicht bedeckt wird, was den elektrisch leitenden Kontakt zwischen Karosserieteil und Kabelschuh unterbinden würde. Ein derartiges Verfahren ist jedoch zeitraubend und aufwändig und damit kostenintensiv.The German Utility Model G 93 12 678 U1 discloses a method which is common in the automotive industry. Bolts bolted with bolts are supplied, which are welded to the body parts and painted together with them. Then the cap nut is unscrewed, the respective cable lug attached and screwed the cap nut again, the cable lug is attached. The cap nut prevents during the painting that the bolt shaft is covered with an electrically insulating paint layer, which would prevent the electrically conductive contact between the body part and cable lug. However, such a method is time-consuming and expensive and therefore expensive.
Ferner sind so genannte "Lackkratzmuttern" bekannt. Derartige Muttern bewirken, dass beim Aufschrauben auf einen lackierten Bolzenschaft die Lackschicht wieder vom Bolzenschaft abgeschabt und auf diese Weise der elektrische Kontakt hergestellt wird. Es ist jedoch schwierig, die Mutter auf den Bolzenschaft aufzuschrauben, weil die Lackschicht in das Bolzengewinde eindringt und damit den Schraubvorgang behindert. Insbesondere ist die Gängigkeit der Schraubverbindung unbefriedigend und daraus folgend auch der elektrische Kontakt nicht sicher gewährleistet.Furthermore, so-called "paint scratch nuts" are known. Such nuts cause when screwed onto a painted stud shank, the lacquer layer scraped off again from the bolt shank and in this way the electrical contact is made. However, it is difficult unscrew the nut on the bolt shank, because the lacquer layer penetrates into the bolt thread and thus hinders the screwing process. In particular, the accessibility of the screw connection is unsatisfactory and consequently also the electrical contact is not guaranteed.
Die "Lackkratzmutter" wirkt bei diesem Vorgang wie ein Gewindeschneider, was das weitere Problem aufwirft, dass das Bolzengewinde über seine gesamte Länge, also von der Spitze bis zum Bolzenfuß, abgeschabt wird. Damit geht der Korrosionsschutz an der freiliegenden Spitze und den freiliegenden Gewindegängen des Bolzenschafts verloren, so dass dieser mit einer Kappe oder Hutmutter abgedeckt werden muss. Dies führt zu einem höheren Gewicht und zu steigenden Kosten.The "paint scratch nut" acts like a tap in this process, which poses the further problem that the bolt thread over its entire length, so from the tip to the bolt foot, scraped. Thus, the corrosion protection at the exposed tip and the exposed threads of the bolt shaft is lost, so that it must be covered with a cap or cap nut. This leads to a higher weight and rising costs.
Die Aufgabe der vorliegenden Erfindung besteht somit darin, ein gattungsgemäßes Befestigungssystem derart weiterzubilden, dass ein zuverlässiger und dauerhafter elektrischer Kontakt mit möglichst geringem Aufwand erzielt werden kann.The object of the present invention is therefore to develop a generic fastening system such that a reliable and durable electrical contact with the least possible effort can be achieved.
Die Lösung besteht in einem Befestigungssystem mit den Merkmalen des Patentanspruchs 1. Erfindungsgemäß ist vorgesehen, dass das Befestigungssystem Mittel aufweist, die am Bolzenschaft im Bereich des Bolzenfußes mit einer Mutter zusammenwirkend angeordnet sind und/oder am Bauteil vorgesehen sind, und dass das oder die Mittel die elektrisch isolierende Schicht des Gewindebolzens ausschließlich im Bereich des Bolzenfußes durchdringen und einen elektrischen Kontakt zwischen dem Gewindebolzen und dem Bauteil bewirken.The solution consists in a fastening system having the features of claim 1. According to the invention, the fastening system comprises means which are arranged on the bolt shank in the region of the bolt foot cooperating with a nut and / or provided on the component, and that or the means penetrate the electrically insulating layer of the threaded bolt exclusively in the region of the bolt foot and cause electrical contact between the threaded bolt and the component.
Der erfinderische Grundgedanke besteht somit darin, dass der an einem Werkstück elektrisch leitend befestigte Bolzenschaft gemeinsam mit dem Werkstück lackiert wird und dass Mittel vorgesehen sind, die sicherstellen, dass der Bolzenschaft nur im Bereich des Bolzenfußes abgeschabt wird, um in diesem Bereich die Lackschicht wieder zu entfernen und die elektrisch leitende Verbindung zwischen Werkstück und Bauteil zuverlässig und dauerhaft herzustellen.The inventive idea is therefore that the bolt shaft, which is fastened to a workpiece in an electrically conductive manner, is painted together with the workpiece and means are provided which ensure that the bolt shaft is scraped off only in the region of the bolt foot in order to restore the paint layer in this area remove and produce the electrically conductive connection between the workpiece and component reliably and permanently.
Dieser erfinderische Grundgedanke kann grundsätzlich über zwei verschiedene, gleich wirkende Lösungswege verwirklicht werden. Der erste Lösungsweg besteht darin, dass eine Mutter vorgesehen ist, die mit einem im Bereich des Bolzenfußes am Bolzenschaft angeordneten Mittel zusammenwirkt, um in diesem Bereich die Lackschicht zu entfernen. Der zweite Lösungsweg besteht darin, dass das Bauteil selbst über Mittel verfügt, die Teil des erfindungsgemäßen Befestigungssystems sind und die Lackschicht im Bereich des Bolzenfußes entfernen. Eine Mutter muss nicht zwingend vorhanden sein.In principle, this inventive concept can be realized by means of two different, equally effective approaches. The first approach is that a nut is provided which cooperates with a means located in the region of the bolt foot on the bolt shank to remove the lacquer layer in this area. The second approach is that the component itself has means that are part of the fastening system according to the invention and remove the paint layer in the region of the bolt foot. A mother does not necessarily exist.
Das erfindungsgemäße Befestigungssystem besteht somit aus Komponenten, die mit wenig Aufwand und daher kostengünstig hergestellt und zusammengebaut werden können. Das umständliche Abschrauben und Wiederaufschrauben einer Hutmutter nach dem Lackiervorgang entfällt. Die mit dem erfindungsgemäßen Befestigungssystem herstellbare elektrische Verbindung ist zuverlässig und dauerhaft. Die Lackschicht auf dem oberen, nach der Montage in der Regel freiliegenden Bereich des Bolzenschafts bleibt unbeschädigt, so dass sie als Isolier- und Korrosionsschutzschicht wirkt und der Bolzenschaft nicht mehr wie im Stand der Technik mit einer Kappe oder Hutmutter abgedeckt werden muss.The fastening system according to the invention thus consists of components that can be manufactured and assembled inexpensively with little effort and therefore. The complicated unscrewing and re-screwing a cap nut after the painting process is eliminated. The producible with the fastening system according to the invention electrical connection is reliable and durable. The lacquer layer on the upper, after assembly usually exposed area of the bolt shaft remains undamaged, so that it acts as an insulating and corrosion protection layer and the bolt shaft no longer needs to be covered as in the prior art with a cap or cap nut.
Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Advantageous developments emerge from the subclaims.
Der erste Lösungsweg der vorliegenden Erfindung, bei dem eine Mutter vorgesehen ist, die mit einem im Bereich des Bolzenfußes am Bolzenschaft angeordneten Mittel zusammenwirkt, kann bspw. dadurch verwirklicht sein, dass das am Bolzenschaft angeordnete Mittel als radiale Verbreiterung ausgebildet ist, die mit einer radialen Ausnehmung in der Mutter zusammenwirkt, deren Innendurchmesser an mindestens einem Flächenbereich kleiner ist als der Außendurchmesser der radialen Verbreiterung. Der Bolzenschaft ist somit im Bereich des Bolzenfußes verbreitert. Die Mutter ist mit einer entsprechenden radialen Ausnehmung versehen, welche die radiale Verbreiterung bei der Montage umgreift. Aufgrund des Untermaßes wird dabei die Lackschicht von dem verbreiterten Bereich abgeschabt und die elektrische Kontaktfläche freigelegt. Da weder am verbreiterten Bereich des Bolzenschaft noch in der Ausnehmung der Mutter ein Gewinde vorgesehen ist, sind sowohl Mutter als auch Bolzen besonders einfach und kostengünstig herzustellen.
Die radiale Ausnehmung in der Mutter kann durch mindestens eine vertikale Nut unterbrochen sein, so dass die vertikalen Kanten der Nut als Schabeelemente gegenüber der radialen Verbreiterung wirken und so die elektrische Kontaktfläche freilegen. Besonders geeignet sind zwei oder mehr, insbesondere gleichmäßig um den Umfang der radialen Ausnehmung verteilte Nuten. Mit dieser Ausbildung kann insbesondere das Schabemoment reduziert bzw. die gewünschte Vorspannkraft verlässlich erreicht werden.The first approach of the present invention, in which a nut is provided which cooperates with a means arranged in the region of the bolt foot on the bolt shank, can, for example, be realized in that the means arranged on the bolt shank means is designed as a radial widening, with a radial Recess cooperates in the mother whose inner diameter is smaller at least one surface area than the outer diameter of the radial broadening. The bolt shank is thus widened in the area of the bolt foot. The nut is provided with a corresponding radial recess, which surrounds the radial widening during assembly. Due to the undersize, the lacquer layer is scraped off from the widened region and the electrical contact surface is exposed. Neither at the widened area of the bolt shaft nor in the recess of the Nut is provided a thread, both nut and bolt are particularly simple and inexpensive to manufacture.
The radial recess in the nut may be interrupted by at least one vertical groove, so that the vertical edges of the groove act as scraper elements relative to the radial widening and thus expose the electrical contact surface. Particularly suitable are two or more, in particular evenly distributed around the circumference of the radial recess grooves. With this design, in particular the scraping torque can be reduced or the desired preload force can be reliably achieved.
Die radiale Verbreiterung am Bolzenschaft kann auf vielfältige Weise ausgebildet sein, um die oben beschriebenen Wirkung zu erzielen, bspw. unrund, gerändelt, vieleckig oder vielrund. Eine besonders einfach herzustellende Ausführungsform der radialen Verbreiterung ist die Ausbildung als umlaufender Bund. In vergleichbarer Weise kann auch die radiale Ausnehmung in der Mutter zum Erzielen der beschriebenen Wirkung auf unterschiedliche Weise ausgebildet, bspw. unrund, gezahnt oder zylinderförmig.The radial broadening of the bolt shank can be designed in many ways to achieve the effect described above, for example. Out of round, knurled, polygonal or round. A particularly easy-to-manufacture embodiment of the radial broadening is the training as a circumferential collar. In a comparable manner, the radial recess in the nut can also be designed in different ways to achieve the described effect, for example, out of round, toothed or cylindrical.
In besonders vorteilhafter Weise ist der Durchmesser des Innengewindes der Mutter größer als der Durchmesser des Außengewindes des Bolzenschafts. Dadurch ist besonders zuverlässig sichergestellt, dass ungeachtet der Dicke der Lackschicht im Einzelfall diese beim Aufschrauben der Mutter in dem mit dem Gewinde versehenen Bereich des Bolzenschafts unversehrt bleibt und einen zuverlässigen Korrosionsschutz bildet.In a particularly advantageous manner, the diameter of the internal thread of the nut is greater than the diameter of the external thread of the bolt shaft. This ensures particularly reliably that regardless of the thickness of the paint layer in an individual case, this remains intact when screwing the nut in the threaded portion of the bolt shaft and forms a reliable corrosion protection.
Zur Vereinfachung der Montage kann das Bauteil drehbar und unverlierbar mit der Mutter verbunden sein. Das Bauteil kann bspw. eine Öffnung aufweisen, an deren Innenseite mindestens zwei sich axial erstreckende Haltelappen ausgebildet sind, welche in eine umlaufende Hinterschneidung in der Mutter eingreifen. In umgekehrter Weise kann das Bauteil aber auch mindestens zwei Halteelemente aufweisen, welche einen an der Mutter vorgesehenen, umlaufenden Bund umgreifen oder in eine an der Mutter vorgesehene, umlaufende Vertiefung eingreifen. Schließlich kann das Bauteil auch einen umlaufenden Bördelrand aufweisen, welcher den umlaufenden Bund umgreift bzw. in die umlaufende Vertiefung eingreift.To simplify the assembly, the component can be rotatably and captively connected to the mother. The component may, for example, have an opening, on the inside of which at least two axially extending retaining tabs are formed, which engage in a circumferential undercut in the nut. In the reverse manner, however, the component may also have at least two holding elements which engage around a peripheral collar provided on the nut or engage in a circumferential depression provided on the nut. Finally, the component may also have a peripheral bead, which engages around the encircling collar or engages in the circumferential recess.
Der zweite Lösungsweg der vorliegenden Erfindung, bei dem das Bauteil selbst über Mittel verfügt, die Teil des erfindungsgemäßen Befestigungssystems sind und die Lackschicht im Bereich des Bolzenfußes entfernen, kann bspw. dadurch verwirklicht sein, dass die am Bauteil vorgesehenen Mittel als an der Innenseite einer Öffnung angeordnete, mindestens zwei Krallen ausgebildet sind, die radial in die Öffnung hineinragen, und dass die lichte Weite zwischen den freien Enden der Krallen mindestens ebenso groß ist wie der Durchmesser des Bolzenschafts im Bereich des Bolzenfußes. Daraus folgt, dass bei der Montage des Bauteils die Krallen im Bereich des Bolzenfußes am Gewinde des Bolzenschafts entlang schaben. Da das Bauteil vor der Montage mit seiner Öffnung vom Bolzenschaft aufgenommen wird und im Wesentlichen auf dem Bolzenfuß aufliegt, bleibt die Lackschicht auf dem Bolzenschaft in seinem oberen Bereich unbeschädigt. Die Montage kann mit einem beliebigen geeigneten Werkzeug erfolgen, bspw. Montageschlüssel, Schraubenschlüssel etc. Da die Krallen nach dem Montagevorgang mit dem Gewinde verkeilt sind, ist es nicht zwingend notwendig, eine zusätzliche Mutter zur Befestigung des Bauteils am Gewindebolzen vorzusehen, da das Bauteil selbsttätig auf dem Bolzen zuverlässig gehalten ist. Der Einsatz einer Mutter, bspw. als Montagewerkzeug, steht im Belieben des Anwenders. Ferner sind Modifikationen hinsichtlich der Krallenform, der Materialpaarung von Bauteil, Krallen und Bolzenschaft und der Festigkeit der jeweils verwendeten Materialien denkbar, so dass diese Ausführungsform des erfindungsgemäßen Befestigungssystems eine besonders große Variationsbreite hinsichtlich ihrer physikalischen Eigenschaften ermöglicht.The second approach of the present invention, in which the component itself has means which are part of the fastening system according to the invention and remove the paint layer in the region of the bolt foot, can, for example, be realized in that the means provided on the component than at the inside of an opening arranged, at least two claws are formed, which protrude radially into the opening, and that the clear width between the free ends of the claws is at least as large as the diameter of the bolt shaft in the region of the bolt foot. It follows that during the assembly of the component, the claws in the area of the bolt foot scrape along the thread of the bolt shaft. Since the component is received by the bolt shaft with its opening prior to assembly and essentially rests on the bolt foot, the paint layer on the bolt shaft remains undamaged in its upper region. The assembly can be done with any suitable tool, eg. Mounting wrench, wrench, etc. Since the claws are wedged after the assembly process with the thread, it is not absolutely necessary to provide an additional nut for mounting the component on the threaded bolt, since the component automatically is held reliably on the bolt. The use of a nut, for example as an assembly tool, is at the discretion of the user. Furthermore, modifications with regard to the claw shape, the material combination of component, claws and bolt shank and the strength of the materials used in each case are conceivable, so that this embodiment of the fastening system according to the invention allows a particularly wide range of variations in terms of their physical properties.
Die freien Enden der Krallen sind bevorzugt oberhalb des Bauteils in Richtung des Bolzenschafts ausgerichtet. Dadurch werden sie beim Befestigungsvorgang besonders weit nach unten und innen gedrückt und damit besonders fest in das Gewinde des Bolzenschafts gepresst.The free ends of the claws are preferably aligned above the component in the direction of the bolt shaft. As a result, they are pressed particularly far down and in the attachment process and thus pressed particularly firmly into the thread of the bolt shaft.
Die Form der Krallen kann frei gewählt werden und steht im Belieben des Fachmanns. Bspw. können die Krallen im Querschnitt in etwa eine S-Form oder Z-Form aufweisen. Sie können aber auch geradlinig ausgebildet sein, was eine besonders einfache Herstellung erlaubt.The shape of the claws can be chosen freely and is at the discretion of the person skilled in the art. For example. For example, the claws may be approximately S-shaped or Z-shaped in cross-section. But they can also be formed straight, which allows a particularly simple production.
In einer weiteren Ausführungsform kann der Bolzenschaft eine radiale Verbreiterung aufweisen, die zur Herstellung des elektrischen Kontakts zwischen dem Gewindebolzen und dem Bauteil mit den Krallen zusammenwirkt. Die radiale Verbreiterung kann mit oder ohne Gewinde ausgebildet sein. In einer vorteilhaften alternativen Ausbildung können in der radialen Verbreiterung Aussparungen vorgesehen sein, um das Verkeilen der Krallen zu unterstützen und so eine besonders feste Verbindung zwischen dem Bolzenschaft und dem Bauteil zu erhalten, die eine zusätzliche Sicherung bspw. durch eine Mutter entbehrlich macht. Auch hier kann zur Vereinfachung der Herstellung die radiale Verbreiterung als umlaufender Bund ausgebildet sein.In a further embodiment, the bolt shank can have a radial widening, which cooperates with the claws for producing the electrical contact between the threaded bolt and the component. The radial broadening can be formed with or without thread. In an advantageous alternative embodiment recesses may be provided in the radial broadening to assist the wedging of the claws and so to obtain a particularly strong connection between the bolt shank and the component, which makes an additional backup, for example, by a mother dispensable. Again, for ease of manufacture, the radial broadening may be formed as a circumferential collar.
Bei der Ausgestaltung des zweiten Lösungswegs der vorliegenden Erfindung, bei dem das Bauteil selbst über Mittel verfügt, die Teil des erfindungsgemäßen Befestigungssystems sind und die Lackschicht im Bereich des Bolzenfußes entfernen, kann das Bauteil ebenfalls drehbar und unverlierbar mit einer Mutter verbunden sein, wenn dies gewünscht wird. Hierfür kann das Bauteil mindestens zwei Halteelemente aufweisen, welche einen an der Mutter vorgesehenen, umlaufenden Bund umgreifen oder in eine an der Mutter vorgesehene, umlaufende Vertiefung eingreifen.In the embodiment of the second approach of the present invention, in which the component itself has means which are part of the fastening system according to the invention and remove the paint layer in the region of the bolt foot, the component can also be rotatably and captively connected to a nut, if desired becomes. For this purpose, the component may have at least two holding elements, which surround a nut provided on the circumferential collar or engage in a provided on the mother, circumferential recess.
Das Bauteil kann insbesondere eine gabelförmig ausgebildete, den Bolzenschaft umgreifende Kontaktfläche aufweisen, die einfach herzustellen und besonders unproblematisch mit dem Bolzenschaft zu verbinden ist.The component may in particular have a fork-shaped, the bolt shank encompassing contact surface, which is easy to manufacture and is particularly easy to connect with the bolt shank.
Das Bauteil ist bevorzugt als Kabelschuh, insbesondere zur Anwendung in der Automobilindustrie, ausgebildet.The component is preferably designed as a cable lug, in particular for use in the automotive industry.
Ein Ausführungsbeispiel der vorliegenden Erfindung wird im Folgenden anhand der beigefügten Zeichnungen näher beschrieben. Dabei sind gleiche Bauteile mit denselben Bezugszeichen versehen. Es zeigen in schematischer, nicht maßstabsgetreuer Darstellung:
- Figur 1
- ein Ausführungsbeispiel für ein erfindungsgemäßes Befestigungssystem in zusammengebautem Zustand;
- Figur 2
- ein erstes Ausführungsbeispiel des erfindungsgemäßen Befestigungssystems im Schnitt;
- Figur 3
- ein zweites Ausführungsbeispiel des erfindungsgemäßen Befestigungssystems im Schnitt;
- Figur 4
- ein drittes Ausführungsbeispiel des erfindungsgemäßen Befestigungssystems im Schnitt;
- Figur 5
- ein viertes Ausführungsbeispiel des erfindungsgemäßen Befestigungssystems im Schnitt;
- Figur 6
- ein fünftes Ausführungsbeispiel des erfindungsgemäßen Befestigungssystems im Schnitt;
- Figur 7
- ein Ausführungsbeispiel eines für das erfindungsgemäße Befestigungssystems geeignet ausgebildeten Bauteils in Form eines Kabelschuhs in Draufsicht;
- Figur 8
- ein weiteres Ausführungsbeispiel einer Mutter für das erfindungsgemäße Befestigungssystem.
- FIG. 1
- an embodiment of an inventive fastening system in the assembled state;
- FIG. 2
- a first embodiment of the fastening system according to the invention in section;
- FIG. 3
- a second embodiment of the fastening system according to the invention in section;
- FIG. 4
- a third embodiment of the fastening system according to the invention in section;
- FIG. 5
- a fourth embodiment of the fastening system according to the invention in section;
- FIG. 6
- a fifth embodiment of the fastening system according to the invention in section;
- FIG. 7
- an embodiment of a suitably designed for the fastening system according to the invention component in the form of a cable lug in plan view;
- FIG. 8
- a further embodiment of a nut for the fastening system according to the invention.
Bspw. im Automobilbau wird der Gewindebolzen 11 ohne die Mutter 14 auf dem Karosserieteil 40 befestigt. Anschließend wird die Karosserie mitsamt dem Gewindebolzen 11 lackiert. Dann wird der Kabelschuh 50 montiert und durch Aufschrauben der Mutter 14 gehalten. Der elektrische Kontakt zwischen dem Kabelschuh 50 und dem Karosserieteil 40 muss also vom Kabelschuh 50 über die Mutter 14 vom Mutterngewinde zum Bolzengewinde und über den Bolzenfuß 13 in das Karosserieteil verlaufen. Dazu muss vom Bolzenschaft 12 die Lackschicht zumindest teilweise wieder entfernt werden. Das erfindungsgemäße Befestigungssystem 10 zeichnet sich dadurch aus, dass das Ende des Bolzenschafts 12 freiliegt, d.h. nicht mit einer Kappe oder Hutmutter abgedeckt ist. In diesem freiliegenden Bereich ist die Lackschicht auf dem Bolzenschaft 12 unbeschädigt, obwohl die Mutter 14 bereits aufgeschraubt ist, so dass die Lackschicht als Korrosionsschutz für den Bolzenschaft 12 wirkt. Wie dieses Ergebnis erzielt werden kann, zeigen die
In dem in
Statt dessen kann zur Montage des Kabelschuhs 50 auf dem Gewindebolzen 11 auch ein Werkzeug 30 (in
Diese Art der Befestigung des Bauteils 50 an der Mutter 14 kann auch bei erfindungsgemäßen Befestigungssystemen, die das erste Lösungsprinzip verwirklichen (vgl.
Claims (25)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102007032100 | 2007-07-10 |
Publications (3)
Publication Number | Publication Date |
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EP2088645A2 true EP2088645A2 (en) | 2009-08-12 |
EP2088645A3 EP2088645A3 (en) | 2010-12-15 |
EP2088645B1 EP2088645B1 (en) | 2012-02-08 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20080012084 Expired - Fee Related EP2088645B1 (en) | 2007-07-10 | 2008-07-04 | Fastening system |
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EP (1) | EP2088645B1 (en) |
DE (1) | DE102008031785A1 (en) |
Families Citing this family (2)
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DE102017203984A1 (en) * | 2017-03-10 | 2018-09-13 | Bayerische Motoren Werke Aktiengesellschaft | Bolt for fastening components or grounding electrical or electronic components to a vehicle body, bolted bolt assembly, and method of forming the bolt assembly |
US11735837B2 (en) * | 2019-10-17 | 2023-08-22 | Production Spring, LLC | Electrical ground strap assemblies providing increased point of contact between a terminal and a bolt |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9105667U1 (en) * | 1991-05-07 | 1991-07-04 | Steinbach & Vollmann Gmbh & Co, 5628 Heiligenhaus | Grounding nut |
DE9312678U1 (en) * | 1993-08-24 | 1993-12-09 | Nedschroef Plettenberg GmbH, 58840 Plettenberg | Cover system |
WO1999040330A1 (en) * | 1998-02-05 | 1999-08-12 | Aoyama Seisakusho Co., Ltd. | Earth nut |
DE102006034501A1 (en) * | 2006-07-26 | 2008-01-31 | Daimler Ag | Earth contact arrangement for fixing electrical connection at vehicle body, has metallic threaded bolt fastened at body, and slot provided in area of internal thread of fixing unit for retaining of wear or lacquer debris |
-
2008
- 2008-07-04 DE DE102008031785A patent/DE102008031785A1/en not_active Withdrawn
- 2008-07-04 EP EP20080012084 patent/EP2088645B1/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9105667U1 (en) * | 1991-05-07 | 1991-07-04 | Steinbach & Vollmann Gmbh & Co, 5628 Heiligenhaus | Grounding nut |
DE9312678U1 (en) * | 1993-08-24 | 1993-12-09 | Nedschroef Plettenberg GmbH, 58840 Plettenberg | Cover system |
WO1999040330A1 (en) * | 1998-02-05 | 1999-08-12 | Aoyama Seisakusho Co., Ltd. | Earth nut |
DE102006034501A1 (en) * | 2006-07-26 | 2008-01-31 | Daimler Ag | Earth contact arrangement for fixing electrical connection at vehicle body, has metallic threaded bolt fastened at body, and slot provided in area of internal thread of fixing unit for retaining of wear or lacquer debris |
Also Published As
Publication number | Publication date |
---|---|
EP2088645B1 (en) | 2012-02-08 |
DE102008031785A1 (en) | 2009-01-15 |
EP2088645A3 (en) | 2010-12-15 |
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