DE102017104913A1 - Diffuser and motor vehicle with such a diffuser - Google Patents

Abstract

The invention relates to a diffuser (2) for a motor vehicle (1) having a first diffuser element (3), a second diffuser element (4) and a third diffuser element (5), wherein the first, the second and the third diffuser element (3, 4, 5) are arranged successively in one direction and are in particular connected to each other, wherein the first diffuser element (3) can be fastened on the body side, the third diffuser element (5) can be fastened on the casing side and the second diffuser element (4) elastically between the first and the third Diffuser element (3,5) is formed, wherein the third diffuser element (5) via a sliding guide (9) with the body side is slidably fastened.

Description

The invention relates to a diffuser and a motor vehicle with such a diffuser.

There are motor vehicles with a diffuser or with diffusers on the underbody known, in which due to the arrangement of the diffuser or the diffusers, the air flow accelerates when driving the motor vehicle in the diffuser, which reduces the air pressure under the vehicle and the contact pressure of the vehicle to the Increased underbody and thus higher speeds of the vehicle, especially on fast circuits allowed.

The diffusers are usually attached both to the shell of the body in the area of the subfloor and on front or rear paneling elements.

This now has the disadvantage that in a slight impact of the vehicle at low speeds against an obstacle, the cladding elements are elastically deformed so that they do not experience damage. However, this means for the diffuser that between the body-side attachment of the diffuser and the panel-side attachment of the diffuser can result in a compression of the diffuser, which could lead to damage of the diffuser. As a solution to form the cladding element rigid is not possible, since this contradicts the requirement that a collision of the vehicle at low speed without damage should be possible.

A shortening of the diffuser is also not a suitable solution, because the effect of the diffuser especially for long diffusers has a particularly advantageous effect.

It is therefore the object of the present invention to provide a diffuser for a motor vehicle, as well as a motor vehicle with such a diffuser which meets the requirements in the event of impact and yet is simple and inexpensive to manufacture and / or continue to enjoy the advantages of the diffuser are not limited.

The object of the diffuser is achieved with the features of claim 1.

An embodiment of the invention relates to a diffuser for a motor vehicle having a first diffuser element, a second diffuser element and a third diffuser element, wherein the first, the second and the third diffuser element in a direction arranged successively and connected to each other, wherein the first diffuser element body side can be fastened, the third diffuser element is fastened side panel and the second diffuser element is formed elastically between the first and the third diffuser element, wherein the third diffuser element via a sliding guide on the body side, so to the body, slidably fastened. As a result, a diffuser is created, which meets the requirements for impact stability and at the same time brings about the advantages of an improved contact pressure. In this case, the above-mentioned direction is preferably the longitudinal direction of or of the motor vehicle.

Depending on the diffuser may be located at the front of the vehicle or at the rear. At the front of the diffuser is then flowed through by the third diffuser element to the first diffuser element. At the rear of the diffuser is then flowed through by the first diffuser element towards the third diffuser element.

In one embodiment, it is advantageous if the first diffuser element can be fastened to the body of a motor vehicle, in particular by means of screws. For this purpose, screw openings are provided, which are formed in the first diffuser element, which allow the passage and screwing of the first diffuser element to the body.

It is also advantageous if the third diffuser element can be fastened to the trim of the motor vehicle, in particular by means of screws. For this purpose Verschraubungsöffnungen are provided, which are formed in the third diffuser element, which allow the passage and screwing of the third diffuser element on the panel or on a trim part. Optionally, the attachment of the third diffuser element to the panel is also possible by means of clips.

It is also advantageous if the third diffuser element via at least one elongated hole or slotted holes on the body of the motor vehicle can be fastened. Thus, the third diffuser element is fixedly secured on the one hand to the cowling or on the panel and on the other hand spaced therefrom also slidably mounted on the body. This brings a defined displaceability of the third diffuser element, when the panel deforms elastically to the body at a slight impact or impact. The third diffuser element can follow this elastic movement and, within the scope of the length of the oblong hole or slots, it is also guided in a defined manner without the need for damage.

In one embodiment, it is also advantageous if the oblong hole or slots is provided in the third diffuser element or are, by which or by which a screw or screws is graspable or are the body side is screwed or are, so that there is a sliding guide for the third diffuser element in particular on the body. It when two slots are arranged in parallel and spaced from each other is particularly advantageous. As a result, guidance on both sides on lateral sides of the diffuser can be achieved.

In a further embodiment, it is particularly advantageous if the first and the third diffuser element are made as a hard component of a hard plastic and the second diffuser element is solidified as a soft component made of an elastic soft plastic. In this case, a hard component is a component made of a hard plastic, such as polypropylene, polyamide o.Ä. A soft component is a component made of a soft plastic, such as an elastomer. In this case, a hard plastic is in particular no elastomer.

It is also advantageous if the respective slot is overmolded with a layer which is reduced in material thickness compared to the third diffuser element. As a result, false air can be avoided through the slot.

It is also expedient if the layer is overmolded from a hard plastic or a soft plastic. With a soft plastic, elastic deformation can help prevent damage. In a hard plastic, the opening of the slot could be released in an impact, so that then slightly false air could occur.

It is also advantageous if the slot is provided with a web with predetermined breaking point. As a result, the positioning could be simplified, the bridge would break in an impact and the slot could perform its protective function.

It may also be advantageous if the layer has a slot. Then the screw could slide through the layer in the slot without damaging it, especially with a material of the layer as a soft plastic.

The object of the motor vehicle is achieved with the features of claim 10.

An embodiment of the invention relates to a motor vehicle with a, in particular previously described, inventive diffuser.

• 1 eine schematische Darstellung eines Diffusors an einem Unterboden eines Kraftfahrzeugs,
• 2 eine alternative schematische Darstellung des Diffusors an einem Unterboden eines Kraftfahrzeugs,
• 3 eine Detaildarstellung der Befestigung des Diffusors im Bereich eines Langlochs,
• 4 eine schematische Darstellung einer Befestigung mittels eines Langlochs,
• 5 eine alternative schematische Darstellung der Befestigung gemäß 4,
• 6 eine schematische Darstellung einer Befestigung mittels eines Langlochs,
• 7 eine alternative schematische Darstellung der Befestigung gemäß 6, und
• 8 eine weitere alternative schematische Darstellung einer Befestigung.

In the following the invention will be explained in detail by means of an embodiment with reference to the drawing. In the drawing show:

• 1 a schematic representation of a diffuser on an underbody of a motor vehicle,
• 2 an alternative schematic representation of the diffuser on an underbody of a motor vehicle,
• 3 a detailed representation of the attachment of the diffuser in the region of a slot,
• 4 a schematic representation of a fastening by means of a slot,
• 5 an alternative schematic representation of the attachment according to 4 .
• 6 a schematic representation of a fastening by means of a slot,
• 7 an alternative schematic representation of the attachment according to 6 , and
• 8th another alternative schematic representation of a fixture.

The 1 and 2 show schematically an underbody of a motor vehicle 1 with a diffuser 2 , Here is the diffuser 2 in the rear area of the motor vehicle 1 arranged. Alternatively, the diffuser 2 be arranged in the front area.

The diffuser 2 has a first diffuser element 3 , a second diffuser element 4 and a third diffuser element 5 on.

The first, second and third diffuser elements 3 . 4 . 5 are in one direction, the longitudinal direction L of the motor vehicle 1 , arranged one after the other and in particular connected to each other.

The first diffuser element 3 is fastened on the body side. The 1 shows screwed openings 6 through which screws are made to screw the first diffuser element 3 ,

The third diffuser element 5 is the panel side with the panel 7 of the motor vehicle 1 fastened or in 1 and 2 attached. The 1 and 2 show screwed openings 8th through which screws are made to screw the third diffuser element 5 with the disguise 7 , Optionally, the third diffuser element 5 also with the disguise 7 be clipped.

The second diffuser element 4 is elastic between the first and the third diffuser element 3 . 5 trained and arranged. Moves the third diffuser element 5 so can the second diffuser element 4 yield elastically. It can damage the diffuser 2 be avoided.

The third diffuser element 5 also has a sliding guide 9 on each side of the third diffuser element 5 are arranged to the third diffuser element 5 body side slidably fastened to shape. The third diffuser element 5 can be connected to the body so that it can be displaced. These are the sliding guides 9 on the panel 7 opposite end portion of the third diffuser element 5 arranged.

The 3 shows in a detail, like a screw 10 through the sliding guide 9 guided and with the bodywork 11 is screwed, wherein the third diffuser element 5 thus guided displaceable on the body.

Overall, in the 1 and 2 to realize that the first diffuser element 3 in particular by means of screws on the body of a motor vehicle 1 is attached. The third diffuser element is by screws or clips on the panel 7 of the motor vehicle 1 attached. Furthermore, at least one slot 20 or over long holes 20 is also the third diffuser element 5 slidably on the body of the motor vehicle 1 attached.

This is a slot 20 or are the slots 20 , please refer 4 and 5 in the third diffuser element 5 provided by which or by which a screw 21 or screws is graspable or are the body side of the body 22 is screwed or are, so that a sliding guide 9 for the third diffuser element 5 especially on the body 22 results.

This is an open slot 20 provided or the slot 20 Alternatively, it is closed with a thin layer so that false air can be avoided. In this case, thin means that the layer is at least only half as thick as the diffuser element 5 in the region of the oblong hole 20 , preferably not more than 0.2 times or 0.1 times the wall thickness of the diffuser element. This is according to 4 the thickness d to the thickness D in proportion. Where d is less than 0.5 or less than 0.2 or less than 0.1 times the thickness D.

Typically, the diffuser is made of a plastic material. In this case, the first and the third diffuser element 3 . 5 made as a hard component of a hard plastic and the second diffuser element 4 is preferably made as a soft component of an elastic soft plastic. In this case, a hard plastic, for example polypropylene, polyamide o.Ä. and a soft plastic is an elastomer, wherein the hard plastic is in particular no elastomer.

The slot 20 is with a layer 23 closed, see the 4 and 5 , Preference is given to the slot 20 with a layer 23 over-injected, opposite the third diffuser element 5 in the material thickness, see the thickness d, is reduced.

According to the example of 4 and 5 is the layer 23 made of a hard plastic. Alternatively, the layer 23 also be made of a soft plastic, see 8th , This can be the slot 20 be over sprayed with a soft plastic, the optional, see 8th , with a slot 24 is provided.

According to the example of 6 and 7 is the diffuser 2 or the third diffuser element 5 designed such that the slot 20 at one of its end regions with a bridge 25 is provided, which has an opening for performing the screw 21 Are defined. Here is the jetty 25 preferably provided with a predetermined breaking point 26.

LIST OF REFERENCE NUMBERS

1

motor vehicle

2

diffuser

3

first diffuser element

4

second diffuser element

5

third diffuser element

6

Verschraubungsöffnung

7

paneling

8th

Verschraubungsöffnung

9

sliding guide

10

screw

11

body

20

Long hole

21

screw

22

body

23

layer

24

slot

25

web

26

Breaking point

Claims (10)

A diffuser (2) for a motor vehicle (1) having a first diffuser element (3), a second diffuser element (4) and a third diffuser element (5), wherein the first, the second and the third diffuser element (3,4,5) arranged successively in one direction and are formed in particular connected to each other, wherein the first diffuser element (3) is attachable to the body side, the third diffuser element (5) is fastened side panel and the second diffuser element (4) between elastic the first and the third diffuser element (3,5) is formed, wherein the third diffuser element (5) via a sliding guide (9) with the body side is slidably fastened. Diffuser (2) after Claim 1 , characterized in that the first diffuser element (3) in particular by means of screws (10,21) or clips on the body (11,22) of a motor vehicle (1) can be fastened. Diffuser (2) after Claim 1 or 2 , characterized in that the third diffuser element (5) in particular by means of screws (10,21) or clips on the panel (7) of a motor vehicle (1) can be fastened and further on at least one elongated hole (20) or slotted on slots on the body (11,22) of the motor vehicle (1) can be fastened. Diffuser (2) after Claim 1 . 2 or 3 characterized in that the elongated hole (20) or slots (20) is or are provided in the third diffuser element (5) through which or through which a screw (10, 21) or screws (10, 21) is graspable or are, the body side is screwed or are, so that a sliding guide (9) for the third diffuser element (5) in particular on the body (11,22) results. Diffuser (2) after Claim 1 . 2 . 3 or 4 , characterized in that the first and the third diffuser element (3,5) is made as a hard component of a hard plastic and the second diffuser element (4) is solidified as a soft component made of an elastic soft plastic. Diffuser (2) according to one of the preceding Claims 3 to 5 , characterized in that the slot (20) is overmolded with a layer (23) which is reduced in the material thickness compared to the third diffuser element (5). Diffuser (2) after Claim 6 , characterized in that the layer (23) is overmolded from a hard plastic or a soft plastic. Diffuser (2) according to one of the preceding Claims 3 to 7 , characterized in that the slot (20) is provided with a web (25) with predetermined breaking point (26). Diffuser (2) according to one of the preceding Claims 6 to 8th Characterized in that the layer (23) has a slot (24). Motor vehicle (1) with a diffuser (2) according to one of the preceding claims.

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