Attachment device for attaching an energy accumulator to an underbody of a motor vehicle, and motor vehicle equipped therewith

Abstract

For improved attachment of an energy accumulator to an underbody of a motor vehicle, an attachment device has a top side that is designed to be attached to the underbody via attachment fasteners and an underside that is designed to be connected to a top side of the energy accumulator. The underside of the attachment device and the top side of the energy accumulator are integrally bonded by an adhesive at least in a region remote from outer edges of the top side of the energy accumulator.

Claims

1. An attachment device for attaching an energy accumulator to an underbody of a motor vehicle, comprising: an upper side of the attachment device, which upper side is configured to be attached to the underbody via attachment fasteners; a lower side of the attachment device, which lower side is configured to be connected to an upper side of the energy accumulator; and an adhesive, wherein the lower side of the attachment device and the upper side of the energy accumulator are integrally bonded to one another by way of the adhesive at least in a region remote from outer edges of the upper side of the energy accumulator.

2. The attachment device as claimed in claim 1, wherein the lower side of the attachment device is formed parallel to the upper side of the energy accumulator.

3. The attachment device as claimed in claim 1, wherein the attachment device is of planar design.

4. The attachment device as claimed in claim 1, wherein the lower side of the attachment device and the upper side of the energy accumulator are spaced apart from one another at positions where the adhesive is situated.

5. The attachment device as claimed in claim 1, wherein the attachment device comprises a plurality of individual attachment devices having their upper sides attached to the underbody of the motor vehicle.

6. The attachment device as claimed in claim 1, wherein the attachment device comprises a single integral attachment device having the upper side thereof attached to the underbody of the motor vehicle.

7. A motor vehicle, comprising: an underbody; an energy accumulator; and an attachment device as claimed in claim 1.

8. The motor vehicle as claimed in claim 7, wherein the lower side of the attachment device is formed parallel to the upper side of the energy accumulator.

9. The motor vehicle as claimed in claim 7, wherein the attachment device is of planar design.

10. The motor vehicle as claimed in claim 7, wherein the lower side of the attachment device and the upper side of the energy accumulator are spaced apart from one another at positions where the adhesive is situated.

11. The attachment device as claimed in claim 1, wherein the attachment device is connected to the energy accumulator only on an area of the upper side that is away from the outer edges of the upper side of the energy accumulator.

12. The attachment device as claimed in claim 7, wherein the attachment device is connected to the energy accumulator only on an area of the upper side that is away from the outer edges of the upper side of the energy accumulator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view of a partially illustrated motor vehicle from below to which an attachment device according to an embodiment of the invention, together with energy accumulator, is attached.

(2) FIG. 2 is a schematic side view of a part of the arrangement shown in FIG. 1.

(3) FIG. 3 is an alternative embodiment of an attachment device according to the invention in plan view.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) A detailed, nonprejudicial, in particular nonlimiting, description of exemplary embodiments of the present invention is given below with reference to FIGS. 1 to 3. Like elements are provided with identical reference signs, unless stated otherwise.

(5) A motor vehicle 1 is shown partially in a bottom view in FIG. 1. The front region F of the motor vehicle 1 is situated on the left in FIG. 1, its rear region H being situated on the right. What is specifically shown is part of an underbody 5 which is reinforced by torsion struts 10 known per se.

(6) A plurality of attachment devices 15 are mounted on the underbody 5 by means of a number of attachment fastener elements 20, screws according to this exemplary embodiment. The attachment devices 15 shown here are substantially formed in a plane which extends parallel to the underbody 5.

(7) As viewed in the vehicle vertical axis (z direction), an energy accumulator 30 designed as a high-voltage accumulator is attached, below the attachment devices 15, to the underbody 5 by way of attachment elements 35. The attachment elements 35, screws in this exemplary embodiment, are situated on the outer edges 40 of the energy accumulator 30 and are operatively connected to the underbody 5. Moreover, adhesive 45 distributed over an upper surface of the energy accumulator 30 serves for attachment thereof to the attachment devices 15 in particular in those regions which are remote from the outer edges 40 and are not intended to be held by attachment elements (such as 35, which would interfere with the structure or integrity of the energy accumulator 30). As can be gathered from the exemplary embodiment shown here, five substantially square attachment element 15 and adhesive regions 45 are provided in the central region of the x-y plane defined by the energy accumulator 30. However, this is not absolutely necessary; rather, it is possible to provide the adhesive 45 and the attachment elements 15 in a different number, shape and/or position. Moreover, it is possible for the adhesive 45 to have identical or different material properties at various positions.

(8) FIG. 2 corresponds to a section taken along the line A-A of FIG. 1 and represents, in a manner not true to scale, a part of the underbody 5, of the attachment device 15, of the adhesive 45 and of the energy accumulator 30 in the x-z plane. The lower side 50 of the underbody 5 and the upper side 55 of the attachment device 15 are adjacent to one another. The adhesive 45 is applied, on the one hand, to the lower side 60 of the attachment device 15 and, on the other hand, to the upper side 65 of the energy accumulator 30 in such a way that the attachment device 15 and the energy accumulator 30 are integrally bonded to one another.

(9) FIG. 3 shows an alternative embodiment of the attachment device 15 in a bottom view. It is designed as a frame within which interconnected or integrally formed struts 75 have adhesive 45 at discrete points. As can be gathered from this figure, the adhesive has, depending on the point of application to the struts 75, a respectively different geometry in the x-y plane that influences its holding force. As a result, the fastening of the energy accumulator 30 can be optimized in a load-dependent manner and/or in terms of manufacture.

LIST OF REFERENCE SIGNS

(10) 1 Motor vehicle 5 Underbody 10 Torsion strut 15 Attachment device 20 Attachment fastener elements 30 Energy accumulator 35 Attachment fastener elements 40 Outer edges of the energy accumulator 45 Adhesive 50 Lower side of the underbody 55 Upper side of the attachment device 60 Lower side of the attachment device 65 Upper side of the energy accumulator 75 Struts A-A Section line F Front region of the motor vehicle H Rear region of the motor vehicle x, y, z Axes of a motor vehicle-specific Cartesian coordinate system known per se

(11) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.