DE102020102198A1 - Mounting arrangement for a bumper of a motor vehicle and method - Google Patents

Abstract

Mounting arrangement (1) for a bumper (2) of a motor vehicle, comprising a mounting element (3) for positioning and / or fastening the bumper (2) to a support structure (4) of a vehicle shell and an expansion dowel (5) for insertion into the support structure ( 4) and a screw (6) that can be screwed into the expansion dowel (5) for screwing the mounting element (3) to the supporting structure (4). The expansion dowel (5) and the assembly element (3) and the screw (6) form a prefabricated assembly unit (7). The screw (6) extends through a through opening (13) of the mounting element (3) and one end is partially screwed into the expansion dowel (5) so that the assembly unit (7) is inserted in the final assembly by inserting the expansion dowel (5) into the Support structure (4) and a subsequent screwing in of the screw (6) in the expansion anchor (5) on the support structure (4) can be mounted.

Description

The present invention relates to a mounting arrangement for a bumper of a motor vehicle with at least one mounting element for positioning and / or fastening the bumper to a support structure of a vehicle shell.

The mounting arrangement comprises at least one expansion plug for insertion into the support structure and at least one screw that can be screwed into the expansion plug for screwing the mounting element to the support structure. The invention also relates to a method for assembling a bumper of a motor vehicle.

When using such expansion dowels, the expansion dowel is usually inserted into the supporting structure of the vehicle shell and then the assembly element must be aligned in its intended position to match the expansion dowel. Then the screw is inserted through the mounting element and screwed into the expansion anchor. This procedure usually entails a considerable amount of assembly work, especially in connection with the handling and alignment of the individual components. Screwing in and tightening the screw also means a not inconsiderable amount of time for production.

It is therefore the object of the present invention to improve the assembly of the bumper and, preferably, to make it less complex, more rapid and also more reliable.

This object is achieved by a mounting arrangement having the features of claim 1 and by a method according to claim 12. Preferred developments of the invention are the subject matter of the subclaims. Further advantages and features of the present invention emerge from the general description and the description of the exemplary embodiment.

The mounting arrangement according to the invention is suitable for a bumper of a motor vehicle and comprises at least one mounting element for positioning and / or fastening the bumper to a support structure of a vehicle shell. The assembly arrangement comprises at least one expansion dowel for insertion into the supporting structure. The mounting arrangement comprises at least one screw that can be screwed into the expansion dowel for screwing the mounting element to the support structure. The expansion dowel and the assembly element and the screw form a prefabricated assembly unit that is in particular designed and manageable separately from the support structure. The screw extends through a through opening of the mounting element. One end of the screw is partially screwed into the expansion anchor. As a result, in the final assembly, the assembly unit can be mounted on the support structure by inserting the expansion anchor into the support structure and then screwing the screw into the expansion anchor.

The mounting arrangement according to the invention offers many advantages. The prefabricated assembly unit offers a considerable advantage. As a result, the expansion dowel and mounting element as well as the screw can be handled as a single unit and assembled together in a single step. It is also particularly advantageous that the screw is already screwed into the expansion anchor. As a result, for example, only a small angle of rotation is required until the screw connection is firmly seated. It is also particularly advantageous that the expansion dowel is connected to the mounting element with the screw. By inserting the expansion anchor in the support structure, the assembly element is also aligned at the same time. Overall, the invention therefore offers a considerably less complex, more rapid and also more reliable assembly.

In a preferred and advantageous embodiment, the screw in the prefabricated assembly unit is screwed into the expansion dowel at a larger tightening angle than the tightening angle with which the screw is finally to be screwed into the expansion dowel as intended during the final assembly of the assembly unit on the support structure. In the case of the prefabricated assembly unit, the tightening angle is in particular at least twice as large and preferably at least a factor of three or four or five greater than in the case of the final assembly. The tightening angle can also be referred to as the angle of rotation. In particular, the tightening angle is a number of revolutions at

Understand screwing in the screw. In the case of the assembly unit, the screw is screwed into the expansion dowel, in particular at least half and preferably three quarters of its length and / or the intended screw-in length. In particular, the rest of the screwing in of the screw up to its intended tightening torque then takes place during final assembly.

The expansion dowel comprises in particular at least one holding element. The holding element provides at least one anti-rotation device for blocking a rotation of the expansion anchor relative to the mounting element. In particular, the holding element extends through at least one second through opening of the mounting element. Such a configuration can further simplify assembly. One advantage is that twisting the expansion anchor when screwing in the screw (during pre-assembly or prefabrication) and is also effectively prevented from being inserted into the carrier component (during final assembly). The holding element acts in particular on the principle of torque support. In particular, a rotation of the expansion anchor about its longitudinal axis and / or about a longitudinal axis of the screw that can be received therein is blocked by the holding element.

In a possible and advantageous embodiment, the expansion dowel and the mounting element and the screw form a captive bond. In particular, the expansion dowel is fastened to the mounting element by means of the holding element and / or at least one other suitable fastening element, independently of the screw. For example, at least one latching of the expansion anchor on the mounting element can be provided for this purpose. This further simplifies the assembly process and during pre-assembly the fastening element and expansion dowel do not have to be held or fixed individually. The screw can be provided in addition to the holding element and / or to at least one other suitable fastening element. It is also possible, however, for the expansion dowel to be attached to the mounting element only by the screw.

In an advantageous and preferred embodiment, the second through opening and the holding element are correspondingly dimensioned in such a way that the assembly element can be displaced relative to the expansion anchor, for example for alignment or for tolerance compensation. In particular, for this purpose, the holding element can be received in the through opening with a specific play. Such an alignment can be provided during the prefabrication of the assembly unit and / or during the final assembly of the assembly unit on the support structure.

It is possible that the first through-opening and at least in sections the screw are correspondingly dimensioned in such a way that at least up to a certain tightening torque of the screw the mounting element can be displaced relative to the expansion anchor for alignment. It is also possible that a recess in the support structure and the expansion dowel are correspondingly dimensioned in such a way that the assembly unit can be displaced relative to the support structure.

In all of the configurations it is preferred that the expansion dowel comprises an expansion dowel body with at least one dowel shaft which can be expanded by the screw and at least one dowel collar radially surrounding the end of the dowel shaft. The expanding dowel body, in particular the dowel collar and / or the dowel shank, extends in particular only on one side from the assembly element. In particular, the screw can be screwed into the anchor shaft. In particular, the dowel shaft can be inserted into the support structure. In particular, the dowel shaft is suitable and designed to expand by screwing in the screw. In particular, the dowel collar is used to rest against the mounting element and / or the support structure. In particular, the dowel shaft has a larger maximum diameter than the first through opening and / or the recess of the support structure.

The holding element is preferably arranged on a side of the dowel collar facing away from the dowel shank. In particular, the holding element is arranged eccentrically on the dowel collar. In particular, the holding element is arranged eccentrically to the longitudinal axis of the expansion anchor and / or the screw that can be received therein. The holding element is preferably arranged eccentrically on the expansion dowel body.

The holding element is preferably designed in the shape of a rod. In particular, the holding element has a length which is at least one third and preferably at least half the length of the dowel shaft and / or the screw. The length of the holding element can also be at least three quarters of the length of the dowel shaft and / or the screw. The holding element can also be made longer than the dowel shaft and / or the screw. This offers many advantages in prefabrication and also in final assembly. In particular, the length of the holding element is dimensioned in such a way that the anti-twist device can be provided independently of the screw-in depth of the screw in the expansion plug.

It is preferred and advantageous that the dowel collar is clamped between the assembly element and the support structure after final assembly as intended. This offers a particularly reliable and secure attachment.

The mounting element is designed in particular as a plate-like guide profile or comprises at least one such. For example, the guide profile is designed as a plate with bevels and / or embossments. It is possible that the support structure is designed like a plate at least in the assembly area of the assembly unit.

The expansion dowel is particularly preferably made of plastic. The screw particularly preferably comprises a thread which is suitable and designed for an expansion dowel made of plastic. Other suitable materials for the expansion anchor are also possible.

It is also preferred and advantageous that the expansion dowel can be received in a recess in the support structure in a non-rotatable manner. Preferably, the For this purpose, expansion dowel has an out-of-round outer cross-section, at least in sections. For this purpose, the support structure preferably has at least one non-circular recess. In particular, the expansion dowel, in particular its dowel shaft, can be inserted into the recess of the support structure. For example, the outer cross section and / or the recess are rectangular and in particular square. Other suitable geometries that block undesired rotation of the expansion anchor in the recess of the support structure are also possible. The expansion dowel can preferably be latched onto the support structure by means of at least one latching hook and in particular by means of at least two latching hooks. In particular, the at least one latching hook is arranged on the dowel shaft. In particular, the at least one latching hook engages on a side of the support structure facing away from the mounting element. This offers many advantages during final assembly.

The method according to the invention is used to assemble a bumper of a motor vehicle. In this case, at least one assembly element for positioning and / or fastening the bumper to a support structure of a vehicle shell is fastened by means of at least one expansion anchor and at least one screw that can be screwed into the expansion anchor. The expansion dowel and the assembly element and the screw are prefabricated into an assembly unit that can be handled separately from the support structure. For this purpose, the screw is inserted through at least one through opening of the mounting element and partially screwed into the expansion anchor with one end. In particular, the expansion dowel is fixed beforehand by means of at least one holding element on the assembly element so that it cannot rotate and / or is lost. In final assembly, the assembly unit is mounted on the support structure by inserting the expansion anchor into the support structure and then screwing the screw into the expansion anchor, in particular with a defined tightening torque. In particular, the bumper is then aligned and / or fastened to the mounting element.

The method according to the invention also solves the problem posed above in a particularly advantageous manner and offers, for example, considerably more rapid and less complex assembly.

In particular, the assembly arrangement according to the invention is assembled in the method. In particular, the method is designed such that an assembly of the assembly arrangement according to the invention with its configurations can be implemented. In particular, the screw is screwed in with a larger angle of rotation during prefabrication than during final assembly. For example, the screw is screwed in at least 50% or at least 75% or at least 90% or also at least 95% of the intended screw-in depth during prefabrication. The mounting arrangement can comprise at least one bumper. The mounting arrangement preferably comprises a plurality of mounting units which can each be mounted in at least one recess in the support structure. The expansion plug can also be referred to as an expansion nut.

Further advantages and features of the present invention emerge from the exemplary embodiments which are explained below with reference to the accompanying figures.

• 1 eine stark schematisierte Darstellung einer erfindungsgemäßen Montageanordnung in einer geschnittenen perspektivischen Ansicht; und
• 2 die Montageanordnung der 1 in einer geschnittenen Darstellung.

In the figures show:

• 1 a highly schematic representation of a mounting arrangement according to the invention in a sectional perspective view; and
• 2 the assembly arrangement of the 1 in a cut representation.

the 1 shows a mounting arrangement according to the invention 1 with a mounting element 3 for a bumper not shown here 2 . The assembly takes place here according to the method according to the invention. About the mounting element 3 can the bumper 2 on a supporting structure 4th a vehicle shell or be aligned with respect to this.

The mounting element 3 is made by means of an expansion anchor 5 and one in the expansion dowel 5 screw-in screw 6th on the supporting structure 4th attached. The expansion dowel 5 here includes an expansion dowel body 15th with one through the screw 6th expandable dowel shaft 25th and one the dowel shaft 25th dowel collar surrounding radially at the end 35 .

The expansion dowel 5 is here made of plastic and the screw 6th has a thread suitable for plastics. The mounting element 3 is here as a plate-like guide profile 33 educated.

The expansion dowels are used to reduce the installation effort 5 and the mounting element 3 and the screw 6th here to an assembly unit 7th prefabricated or pre-assembled. The assembly unit 7th can then be used as a common structural unit and separate from the supporting structure 4th be handled.

For producing the assembly unit 7th becomes the expansion anchor 5 initially secure against rotation on the mounting element 3 fixed. This is the expansion anchor 5 here with a retaining element 8th equipped, which is through a second through opening 23 of the mounting element 3 extends. The holding element 8th is here at the one from the dowel shaft 25th facing away from the dowel collar 35 arranged eccentrically. The holding element 8th is rod-shaped.

The screw 6th is subsequently through a through opening 13th of the mounting element 3 inserted and one end into the dowel shaft 25th screwed in. During the prefabrication of the assembly unit 7th becomes the screw 6th for example with a larger tightening angle in the expansion dowel 5 screwed in than during final assembly.

the 2 shows the mounting arrangement described above 1 after the intended final assembly, in which the assembly unit 7th on the supporting structure 4th was attached. The dowel shaft is used for final assembly 25th into a recess 14th inserted into the supporting structure. The expansion dowel 5 has a square outer cross-section here. The recess corresponds to this 14th the supporting structure 4th also designed as a square. So can the expansion anchor 5 secure against rotation in the recess 14th can be used.

In addition, the expansion plug is 5 here with locking hooks 45 equipped, which is based on the assembly element 3 facing away from the supporting structure 4th lock into place. After this preliminary latching, the mounting element can be positioned or aligned 3 compared to the supporting structure 4th respectively. For this purpose, for example, the second through opening 23 and the holding element 8th dimensioned so that a displacement of the mounting element 3 and thus tolerance compensation and alignment are possible. After pre-locking and alignment, the screw is then tightened as intended 6th the final assembly step. After the intended final assembly, the dowel collar is 35 between the mounting element 3 the supporting structure 4th clamped.

The invention presented here offers the prefabricated assembly unit 7th the advantage that the fastening elements required for fastening to the shell are already preassembled to such an extent that only a minimal angle of rotation is required in production until the screw connection is firmly seated. This considerably reduces the assembly time and the assembly effort in production.

List of reference symbols

1

Mounting arrangement

2

Bumper

3

Mounting element

4th

Support structure

5

Expansion dowel

6th

screw

7th

Assembly unit

8th

Retaining element

13th

Through opening

14th

Recess

15th

Expansion anchor body

23

Through opening

25th

Dowel shank

33

Guide profile

35

Dowel collar

45

Locking hook

Claims (12)

Mounting arrangement (1) for a bumper (2) of a motor vehicle, comprising at least one mounting element (3) for positioning and / or fastening the bumper (2) to a support structure (4) of a vehicle shell and at least one expansion plug (5) for insertion into the Support structure (4) and at least one screw (6) which can be screwed into the expansion plug (5) for screwing the mounting element (3) to the support structure (4), characterized in that the expansion plug (5) and the mounting element (3) and the screw (6) form a prefabricated assembly unit (7) and that the screw (6) extends through a through opening (13) of the assembly element (3) and one end is partially screwed into the expansion plug (5) so that the assembly unit is in the final assembly (7) can be mounted on the support structure (4) by inserting the expansion anchor (5) into the support structure (4) and then screwing the screw (6) into the expansion anchor (5). Assembly arrangement (1) according to the preceding claim, wherein the screw (6) in the prefabricated assembly unit (7) is screwed into the expansion dowel (5) with a larger tightening angle than the tightening angle with which the screw (6) is used during final assembly The assembly unit (3) on the supporting structure (4) is finally to be screwed into the expansion anchor (5) as intended. Mounting arrangement (1) according to one of the preceding claims, wherein the expansion dowel (5) comprises at least one holding element (8) which provides at least one anti-rotation device for blocking a rotation of the expansion dowel (5) with respect to the assembly element (3) and which is provided by at least one second through opening (23) of the mounting element (3) extends. Mounting arrangement (1) according to the preceding claim, wherein the second through opening (23) and the holding element (8) are correspondingly dimensioned such that the mounting element (3) is displaceable relative to the expansion dowel (5) for alignment. Mounting arrangement (1) according to one of the two preceding claims, wherein the expansion dowel (5) has an expansion dowel body (15) with at least one dowel shank (25) which can be expanded by the screw (6) and at least one dowel collar (35) radially surrounding the dowel shank (25) at the end ) and wherein the holding element (8) is arranged eccentrically on a side of the dowel collar (35) facing away from the dowel shank (25). Mounting arrangement (1) according to the preceding claim, wherein the holding element (8) is rod-shaped and has a length which is at least one third and preferably at least half the length of the dowel shaft (25) and / or the screw (6). Assembly arrangement (1) according to one of the two preceding claims, wherein the dowel collar (35) is clamped between the assembly element (3) and the support structure (4) after final assembly as intended. Mounting arrangement (1) according to one of the preceding claims, wherein the mounting element (3) is designed as a plate-like guide profile (33). Mounting arrangement (1) according to one of the preceding claims, wherein the expansion dowel (5) is made of plastic and wherein the screw (6) comprises a thread made of plastic and suitable for such an expansion dowel (5). Mounting arrangement (1) according to one of the preceding claims, wherein the expansion dowel (5) can be received in a recess (14) in the support structure (4) so as to be non-rotatable, and wherein the expansion dowel (5) has, at least in sections, a non-circular external cross-section and the support structure (4) has a include non-circular recess (14). Mounting arrangement (1) according to one of the preceding claims, wherein the expansion dowel (5) can be latched onto the support structure (4) by means of at least one latching hook (45). Method for assembling a bumper (2) of a motor vehicle, wherein at least one assembly element (3) for positioning and / or fastening the bumper (2) to a support structure (4) of a vehicle shell by means of at least one expansion plug (5) and at least one in the expansion plug (5) screw-in screw (6) is fastened, the expansion dowel (5) and the mounting element (3) and the screw (6) being prefabricated to form a mounting unit (7) that can be handled separately from the supporting structure (4), and the screw ( 6) is inserted through a through opening (13) of the assembly element (3) and partially screwed into the expansion anchor (5) with one end and the assembly unit (7) in the final assembly by inserting the expansion anchor (5) into the support structure (4) and a final screwing in of the screw (6) into the expansion anchor (5) is mounted on the support structure (4).

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