JP2006123799A - Rear bumper structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear bumper structure capable of achieving a further enhancement of the aerodynamic characteristics. <P>SOLUTION: A flange 31 is formed at an open edge of an opening part 21, and a shelf face 34 is formed at the bottom edge of the opening part 21. A curved part 41 extending downward is formed in a single piece with the rear edge of the shelf face 34 on its side nearer the rear R of the vehicle, and a forward extending surface 42 is formed in a single piece with the forefront of the curved part 41. A folded-back part 43 and the shelf face 34 constitute a front open shaped part 44 having a U-section opening to ahead F of the vehicle. Using a thin hinge 51, a lid 52 is formed in a single piece with the forefront of the folded-back part 43 so that two conditions can be taken, one is the spread condition 53 in which the lid 52 is extended downward from the folded-back part 43 and the other is the closed condition 55 in which upon folding upward round the hinge 51, the forefront of the lid 52 is abutted or approached to the forefront of the shelf face 34, and the front opening part 54 of the front open shaped part 44 is closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rear bumper structure provided at a rear portion of a vehicle.

  Conventionally, as shown in FIG. 3A, a rear bumper 102 is provided at the rear end of the vehicle 101, and an opening 103 for downforce is provided in the rear bumper 102.

  As a result, as shown in FIG. 3B, the flow of air generated during traveling is allowed to pass through the opening 103, thereby reducing traveling resistance and generating downward force. It is comprised so that reduction can be aimed at, and it contributes to the improvement of driving | running | working stability.

  The rear bumper 102 is resin-molded by a mold, and the lower portion of the opening 103 is bent below the shelf surface 111 constituting the lower edge of the opening 103 and the rear edge of the shelf surface 111. After that, the front opening shape portion 113 having a U-shaped cross section that opens toward the vehicle front F that is the die-cutting direction is formed by the turn-back portion 112 that is turned back toward the vehicle front F. Thereby, the predetermined rigidity is ensured.

  However, in such a rear bumper 102, the front opening shape portion 113 below the opening portion 103 through which air flows during traveling is formed in a U-shaped cross section, and the bag shape opens toward the vehicle front F. Is made.

  For this reason, there is a problem that the air that flows during traveling stays in the front opening shape portion 113 and the air in this portion cannot flow smoothly to the vehicle rear R.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a rear bumper structure capable of further improving aerodynamic characteristics.

  In order to solve the above problems, in the rear bumper structure of the present invention, the rear bumper is provided with an opening for downforce, and extends below the opening in the vehicle front-rear direction constituting the lower edge of the opening. A front side of a cross-sectional shape that is formed toward the front of the vehicle by the folded back part and the shelf surface. In the rear bumper structure in which the opening shape portion is formed in the lower portion of the opening portion, a lid portion is integrally formed at the front end of the folded portion via a thin hinge portion, and the lid portion extends downward from the folded portion. An unfolded state and a closed state in which the opening portion of the front opening shape portion is closed by folding the hinge portion as a center and bringing the front end of the lid portion into contact with or close to the front end of the shelf surface are configured. And at the tip of the lid, At serial closed provided the fixed portion fixed to the rear bumper.

  That is, at the lower part of the opening provided in the rear bumper, a cross-sectional shape that opens toward the front of the vehicle by a shelf surface that constitutes the lower edge of the opening and a folded portion that is continuous with the rear edge of the shelf surface The front opening shape portion is formed, and air flowing during traveling stays in the front opening shape portion, and a smooth flow is hindered to the rear of the vehicle.

  However, the folded portion is integrally formed with a lid portion via a hinge portion, and is bent around the hinge portion to bring the tip of the lid portion into contact with or close to the front end of the shelf surface. A closed state in which the opening portion of the front opening shape portion is closed is formed. At this time, the said closed state is maintained by fixing the fixing | fixed part provided in the said cover part to the said rear bumper.

  On the other hand, the lid portion is connected to the folded portion via the hinge portion, and the opening portion of the front opening shape portion is opened by extending the lid portion below the folded portion. A developed state is formed.

  As described above, in the rear bumper structure of the present invention, it is possible to form a closed state in which the opening portion of the front opening shape portion provided at the lower portion of the opening portion of the rear bumper is closed by the lid portion. For this reason, the air at the time of driving | running | working can be smoothly flowed to vehicle back.

  Therefore, the air flowing toward the rear of the vehicle during traveling stays at the opening portion of the front opening shape portion formed in the lower portion of the opening portion for downforce, improving the air flow and further improving the aerodynamic characteristics. Can be planned.

  And the said cover part is provided in a row by the folding part which comprises the said front opening shape part via the thin hinge part, and the said front opening is extended by extending the said cover part below from the said folding part. An unfolded state in which the opening portion of the shape portion is opened can be formed.

  Thereby, the said cover part which closes the opening part of the said front opening shape part can be integrally formed in the said rear bumper, without using a slide type | mold. For this reason, it is possible to employ injection molding in which it is difficult to form a closed cross-sectional shape.

  And the rear bumper by which the opening part of the said front opening shape part was closed at the time of use can be formed, without using another blow molded part. Therefore, cost reduction can be achieved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a vehicle 1 having a rear bumper structure according to the present embodiment.

  That is, a rear bumper 12 is provided at the lower rear end of the vehicle body 11 of the vehicle 1 as shown in FIG. 1B, and the bumper body 13 extending in the vehicle width direction of the rear bumper 12 is provided. At both ends, curved portions 14 and 14 that are curved toward the vehicle front F along the side surface of the vehicle 1 are formed. The rear bumper 12 is resin-molded by a mold, and the mold drawing direction is set to the vehicle front F side and the vehicle rear R side in the attached state.

  The bumper body 13 of the rear bumper 12 has a downforce opening 21 extending in the vehicle width direction. As shown in FIG. 2, an air flow 22 generated during travel is generated by the opening 21. By passing the vehicle, the running resistance is reduced, and a downward force is generated to reduce the lift, thereby contributing to improvement in running stability.

  From the opening edge of the opening 21, as shown in FIG. 1B, a flange 31 extending toward the vehicle front F is formed over the entire periphery, and from the flange 31, As shown to (a) of FIG. 2, the protrusions 32 and 32 are protrudingly provided in several places. The protrusion 32 is configured to pass through the wire mesh 33, and the wire mesh 33 covering the opening 21 is supported at the front end of the flange 31. The flange 31 extends in the die-cutting direction, and a shelf surface 34 extending in the vehicle front-rear direction is formed by the flange 31 at the lower edge of the opening 21.

  As shown in FIG. 1B, a curved portion 41 that extends downward and curves toward the vehicle front F side is integrally formed at the rear edge of the shelf surface 34 on the vehicle rear R side. A front extending surface 42 extending toward the vehicle front F is integrally formed at the tip of the curved portion 41. A folded portion 43 which is bent downward from the shelf surface 34 by the front extending surface 42 and the curved portion 41 and then folded to the vehicle front F side is formed at the lower portion of the opening portion 21. 43 and the shelf surface 34 form a front opening shape portion 44 having a U-shaped cross section that opens toward the vehicle front F, which is the die cutting direction, and the rigidity of the rear bumper 12 is enhanced.

  A lid portion 52 is integrally formed at the front end of the folded portion 43 via a thin hinge portion 51 (PP hinge), and the lid portion 52 is as shown by a solid line in FIG. The unfolded state 53 extending downward from the folded portion 43, and as shown by the broken line in the figure, the top end which is the free end portion of the lid portion 52 is bent upward with the hinge portion 51 as a center. A closed state 55 in which the front opening 54 of the front opening shape portion 44 is closed by being brought into contact with or close to the front end of the surface 34 can be arbitrarily formed.

  In the closed state 55, the lid portion 52 extends forwardly and obliquely rearwardly from the front extension portion 61 disposed on the extension of the front extension surface 42 of the folded portion 43. The inclined portion 62 is formed in a cross-sectional shape. The inclined portion 62 is configured to be fixed in a state in which the tip thereof is in contact with or close to the front portion of the shelf surface 34, and the inclined portion 62 is directed from the vehicle front F toward the vehicle rear R during traveling. A guide for guiding the flowing air to the opening 21 is formed.

  As shown in FIG. 2A, a plurality of fixing portions 71 fixed to the rear bumper 12 in the closed state 55 are provided at the tip of the lid portion 52. The fixing portion 71 is formed of an extending piece that extends upward from the inclined portion 62 in the closed state 55, and the fixing portion 71 is configured to extend along the wire mesh 33.

  The fixing portion 71 is provided with an insertion hole 81 into which the protrusion 32 that supports the wire mesh 33 is inserted, and the protrusion 32 is provided with an alligator clip 82. Thereby, the said fixing | fixed part 71 is being fixed to the said flange 31 which comprises the rear bumper 12 with the said metal mesh 33, and the said closed state 55 is maintained.

  In the present embodiment having the above-described configuration, the lower portion of the opening 21 provided in the rear bumper 12 is connected to the shelf surface 34 constituting the lower edge of the opening 21 and the rear edge of the shelf surface 34. The folded-back portion 43 forms a front opening shape portion 44 having a cross-sectional shape that opens toward the front F of the vehicle, and the air flow 22 during traveling stays in the front opening shape portion 44 and the rear of the vehicle. The smooth flow to R may be hindered.

  However, in the present embodiment, a lid portion 52 is integrally formed with the folded portion 43 via a hinge portion 51, and the tip of the lid portion 52 is bent around the hinge portion 51 so that the tip of the lid portion 52 is placed on the shelf. By contacting or approaching the front end of the surface 34, a closed state 55 in which the front opening 54 of the front opening shape portion 44 is closed can be formed. At this time, the closed state 55 can be maintained by fixing the fixing portion 71 provided in the lid portion 52 to the rear bumper 12.

  For this reason, the air at the time of driving | running | working can be smoothly flowed to vehicle back R. FIG. Therefore, the air flowing toward the rear R of the vehicle at the time of traveling improves the air flow and aerodynamics as compared to the conventional case where the air stays at the front opening 54 of the front opening shape portion 44 formed at the lower portion of the downforce opening 21. The characteristics can be further improved.

  The lid portion 52 is connected to the folded portion 43 through the hinge portion 51, and the front opening shape portion 44 extends by extending the lid portion 52 downward from the folded portion 43. The unfolded state 53 can be formed in which the front opening 54 is opened.

  Thereby, the said cover part 52 which closes the front opening part 54 of the said front opening shape part 44 can be integrally formed in the said rear bumper 12 without using a slide type | mold. For this reason, it is possible to employ injection molding in which it is difficult to form a closed cross-sectional shape.

  In addition, the rear bumper 12 in which the front opening 54 of the front opening shape portion 44 is closed can be formed without using another blow molded part. Therefore, cost reduction can be achieved.

(A) is a perspective view which shows one embodiment of this invention, (b) is AA sectional drawing of (a). (A) is sectional drawing which shows the principal part of the embodiment, and is explanatory drawing which shows operation | movement of the embodiment. (A) is a perspective view which shows a prior art example, (b) is BB sectional drawing of (a).

Explanation of symbols

12 Rear bumper 21 Opening part 34 Shelf surface 43 Folding part 44 Front opening shape part 51 Hinge part 52 Cover part 53 Unfolded state 55 Closed state 71 Fixed part

Claims (1)

The rear bumper is provided with an opening for downforce, and at the lower part of the opening is a shelf surface extending in the vehicle front-rear direction constituting the lower edge of the opening and bent downward from the rear edge of the shelf surface. In a rear bumper structure in which a folded portion that is folded back to the front of the rear vehicle is formed, and a front opening shape portion having a cross-sectional shape that opens toward the front of the vehicle at the folded portion and the shelf surface is formed at a lower portion of the opening,
A lid portion is integrally formed at the front end of the folded portion via a thin hinge portion, the lid portion extends downward from the folded portion, and the distal end of the lid portion is bent around the hinge portion. Is closed to the front end of the shelf surface so as to form a closed state in which the opening portion of the front opening shape portion is closed, and the rear bumper is attached to the tip of the lid portion in the closed state. A rear bumper structure characterized by providing a fixed portion to be fixed.

Images