JP2013010471A - Bumper structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bumper structure for a vehicle capable of blowing away a vortex generated in the rear of the vehicle when the vehicle travels by arranging a rear bumper beam in a rear bumper face.SOLUTION: The bumper structure for the vehicle is constituted by arranging a flowing hole 13 for making air flowing under a vehicle body 5 when the vehicle 1 travels flow to a vehicle rear side by making the air flow therein, in the rear bumper beam 11 arranged in a rear part of the vehicle 1, arranging an outflow hole 21 for making the air flowing out of a rear side opening 13a flow out to the vehicle rear by making air pass therethrough in the rear bumper face 20 facing the rear side opening 13a of the flowing hole 13, and arranging an introducing passage 15 connected to a front side opening 13b having the front end opening at a rear surface 6a of a wheel house 6 and having the rear end opening at the front side of the flowing hole 13.

Description

  The present invention relates to a vehicle bumper structure in which a rear bumper beam that absorbs an impact is disposed inside a rear bumper face disposed at a rear portion of a vehicle.

  2. Description of the Related Art A bumper extending in the vehicle width direction is provided on the lower rear side of a vehicle such as an automobile. The bumper has a hollow interior, the front side is open, a trunk case or the like is disposed above the front side of the bumper, and the lower side on the front side of the bumper is open. For this reason, when the vehicle travels, the air flowing under the vehicle flows into the rear part of the vehicle, and the air resistance increases due to the inflow of air into the bumper, thereby reducing the traveling performance.

  On the other hand, a vortex is generated behind the rear end of the vehicle body due to a pressure difference between the upper airflow flowing along the upper surface of the vehicle body and the lower airflow flowing along the lower surface of the vehicle body when the vehicle travels, and dust is rolled up.

  In view of this, there has been proposed a bumper provided with an opening for flowing the air flowing into the rear of the vehicle to the rear of the vehicle (see Patent Document 1). By providing this opening in the bumper, air that has flowed into the rear of the vehicle when the vehicle is running is discharged to the rear of the vehicle through the opening. For this reason, an increase in air resistance due to the air flowing into the bumper can be suppressed, and vortex generated at the rear of the vehicle can be blown away by the air discharged from the opening to suppress the dust from being rolled up.

1991-248942

  In this conventional bumper structure, when a rear bumper beam capable of absorbing impact is arranged inside the bumper, even if the bumper is provided with an opening, the air flowing into the rear of the vehicle when the vehicle is running is obstructed by the rear bumper beam and opened. It becomes impossible to pass through the part, and it becomes impossible to blow away the vortex generated behind the vehicle. Moreover, if the opening part opened on the front lower side of the bumper is closed, the air flowing into the bumper is blocked and an increase in air resistance can be suppressed, but the vortex generated at the rear of the vehicle cannot be blown away.

  The present invention has been made in view of such a problem, and in a bumper structure in which a rear bumper beam is disposed inside a bumper, a vehicular bumper structure capable of blowing off a vortex generated at the rear of the vehicle when the vehicle travels is provided. The purpose is to provide.

  In order to achieve the above object, a vehicle bumper structure according to the present invention is a vehicle bumper structure in which a rear bumper beam capable of absorbing an impact is disposed inside a rear bumper face disposed in a rear portion of a vehicle. The beam is provided with a flow hole that allows air flowing under the vehicle body of the vehicle to flow to the vehicle rear side when the vehicle is running, and the rear bumper face facing the opening on the rear bumper face side of the flow hole has an opening. An outflow hole is provided for allowing the air flowing out from the part to flow out to the rear of the vehicle (claim 1).

  Further, the flow hole of the present invention enables air to flow by connecting the front opening that opens to the front surface of the rear bumper beam, the rear opening that opens to the rear surface of the rear bumper beam, and the front opening and the rear opening. And an air passage (claim 2).

  The flow hole of the present invention is formed by a top surface and a bottom surface of the rear bumper beam and a rib disposed in the inside (Claim 3).

  Further, the air passage of the present invention is characterized in that the cross-sectional area of the front-side passage and the cross-sectional area of the rear-side passage are different to change the air flow velocity.

  Furthermore, the cross-sectional area of the front passage of the air passage of the present invention is larger than the cross-sectional area of the rear passage (Claim 5).

  As described above, the vehicular bumper structure according to the present invention has the above-described characteristics, and in the bumper structure in which the rear bumper beam is disposed inside the rear bumper face, the vortex generated at the rear of the vehicle when the vehicle travels. A bumper structure for a vehicle that can be blown away can be provided.

The side view of the vehicle provided with the bumper structure for vehicles concerning one embodiment of the present invention is shown. The fragmentary sectional view of the rear lower part of the vehicle provided with the bumper structure for vehicles provided with the flow path extended from the rear surface part of the wheel house concerning one embodiment of the present invention to the vehicle rear side is shown. The fragmentary sectional view of the back lower part of the vehicle provided with the bumper structure for vehicles provided with the flow path extended from the bottom face of the rear lower part of the vehicle concerning the other embodiment of this invention to the vehicle rear side is shown. FIG. 4 is a schematic cross-sectional view of a vehicle bumper structure provided at a lower portion of a rear bumper beam according to another embodiment of the present invention and provided with a through hole in a reinforced rear bumper beam. FIG. 5 is a schematic cross-sectional view of a vehicle bumper structure in which a through hole is provided between a rear bumper beam according to another embodiment of the present invention and a reinforced rear bumper beam provided adjacent thereto. The schematic sectional drawing of the bumper structure for vehicles which does not have the introduction channel | path concerning other embodiment of this invention is shown. The schematic structural drawing of the rear bumper beam which has the flow hole concerning other embodiment of this invention is shown.

  Hereinafter, a preferred embodiment of a vehicle bumper structure of the present invention will be described with reference to FIGS. FIG. 2 is a partial cross-sectional view of the lower rear portion of a vehicle on which the vehicle bumper structure of the present invention is mounted. As shown in FIG. 2, a rear bumper 10 extending in the vehicle width direction is provided on the rear lower portion 1a of the vehicle 1 on the rear side of the rear wheel 3 of the vehicle 1. The rear bumper 10 includes a rear bumper beam 11 that can efficiently transmit and disperse an impact load to the left and right of the vehicle body 5 at the time of a rear collision as a vehicle body reinforcing member, and a rear bumper face 20 as an external member that covers the rear bumper beam 11. .

  The rear bumper beam 11 is fixed to a rear end portion of the side frame fixed to both lower surfaces of the rear frame of the vehicle 1 in the vehicle width direction via a connecting member, and is supported by the side frame. In FIG. 2, the rear frame, the side frame, and the connection member are not shown. The rear bumper beam 11 has a substantially rectangular cross section with a hollow inside, and has a front surface 11a facing the front side, a rear surface 11b facing the rear side, an upper surface 11c facing the upper side, and a bottom surface 11d facing the lower side. The rear bumper beam 11 is integrally formed of a metal material such as a synthetic resin material or an aluminum alloy.

  The rear bumper face 20 is integrally formed of a synthetic resin material, is bent forward, and is attached to the rear bumper beam 11 from the rear side of the rear bumper beam 11. The lower end portion of the rear bumper face 20 is connected to the bottom surface of the vehicle body 5. For this reason, the air flowing below the vehicle body 5 does not flow into the rear lower portion 1a of the vehicle 1 when the vehicle 1 is traveling.

  When such a vehicle 1 travels forward, as shown in FIG. 1, due to the pressure difference between the upper airflow Au flowing along the upper surface of the vehicle body 5 and the lower airflow Ad flowing along the bottom surface of the vehicle body 5, A vortex W is generated in the rear, and dust is wound up.

  Therefore, as shown in FIG. 2, the vehicle bumper structure of the present invention has a rear bumper face that is provided with a flow hole 13 extending in the front-rear direction in the rear bumper beam 11 and faces the rear opening 13 a on the rear side of the flow hole 13. 20, an outflow hole 21 is provided, and an introduction passage 15 for introducing air flowing inside the wheel house 6 of the rear wheel 3 is connected to the front opening 13 b of the circulation hole 13.

  The through holes 13 are formed between the front opening 13b described above that opens on the front surface 11a of the rear bumper beam 11, the rear opening 13a that opens on the rear surface 11b of the rear bumper beam 11, and the front opening 13b and the rear opening 13a. And an air passage 13c through which air can be circulated. The cross-sectional shape of the circulation hole 13 is not limited as long as air can be circulated, and may be any of a circular shape, a rectangular shape, and a combination thereof. The air passage 13c communicates with the introduction passage 15 and is formed so that the cross-sectional area of the flow passage 16 including the introduction passage 15 and the flow hole 13 gradually decreases as it advances from the front side to the rear side. For this reason, the flow velocity of the air flowing through the flow passage 16 increases in the process of flowing. As shown in FIG. 7, when a plurality of ribs 11 e are provided on the inner side of the rear bumper beam 11 so as to extend in the front-rear direction, the space between the ribs 11 e adjacent to each other in the vehicle width direction serves as the flow hole 13. May be used.

  The introduction passage 15 has a front end opened to the rear surface portion 6 a of the wheel house 6 of the rear wheel 3, a rear side of the introduction passage 15 extends toward the rear bumper beam 11, and a rear end portion of the introduction passage 15 is a front opening 13 b of the flow hole 13. It is connected to the. For this reason, the space inside the wheel house 6 communicates with the circulation hole 13 via the introduction passage 15. The air flowing through the flow passage 16 flows out from the outflow hole 21 of the rear bumper face 20 in a state where the flow velocity is increased. Therefore, the vortex W generated behind the vehicle can be blown away by the air flowing out from the outflow hole 21. The introduction passage 15 only needs to be able to circulate air, and is formed of a synthetic resin material, a metal material, or the like.

  The front end portion of the introduction passage 15 may be provided so as to open on the lower surface of the rear lower portion 1a of the vehicle body 5, as shown in FIG. When the introduction passage 15 is provided in this way, the air flowing into the introduction passage 15 from below the vehicle body 5 flows into the flow passage 16 and increases in flow velocity as it flows through the flow passage 16, and flows out from the outflow hole 21 of the rear bumper face 20. Is done. Therefore, the vortex W generated behind the vehicle can be blown away by the air discharged from the outflow hole 21.

  As described above, the flow hole 13 is provided not only in the rear bumper beam 11 (see FIG. 3) but also in the reinforcing rear bumper beam 23 provided in the lower portion of the rear bumper beam 11 as shown in FIG. Good. The reinforced rear bumper beam 23 is provided for the purpose of reinforcing the rear bumper beam 11. The rear bumper beam 11 is formed in a rectangular shape in cross section like the rear bumper beam 11 and extends in the vehicle width direction along the rear bumper beam 11. It is fixed to.

  When the flow hole 13 is provided in the reinforced rear bumper beam 23, the outflow hole 21 is provided in the rear bumper face 20 facing the rear opening 13 a that opens to the rear side of the flow hole 13. The shape and the mounting position of the flow hole 13 and the introduction passage 15 communicating with the flow hole 13 are the same as those in the case where the flow hole 13 is provided in the rear bumper beam 11 described above, and the description thereof is omitted.

  Further, as shown in FIG. 5, the flow hole 13 may be provided at a position between the rear bumper beam 11 and the reinforcing rear bumper beam 23 provided below the rear bumper beam 11. In this case, the outflow hole 21 is provided in the rear bumper face 20 facing the rear side opening 13 a that opens to the rear side of the circulation hole 13. The shape of the flow hole 13 and the introduction passage 15 communicating with the flow hole 13 and the mounting position on the front side of the vehicle are the same as those in the case where the flow hole 13 is provided in the rear bumper beam 11 described above, and a description thereof will be omitted.

  Thus, by providing the flow hole 13 between the reinforcing rear bumper beam 23 or between the rear bumper beam 11 and the reinforcing rear bumper beam 23, the vortex W generated behind the vehicle by the air discharged from the outflow hole 21 can be blown off.

  In the above-described embodiment, the case where the lower surface of the rear lower portion 1a of the vehicle 1 behind the rear wheel 3 is blocked is described as an example. However, the lower surface of the rear lower portion 1a of the vehicle 1 is open. However, the vehicular bumper structure of the present invention can be applied. In this case, as shown in FIG. 6, the introduction passage is eliminated in the rear lower portion 1a of the vehicle 1, and the air flowing in from the opening 1b opened in the lower surface of the rear lower portion 1a is caused to flow into the flow hole 13. It flows out from the outflow hole 21. Further, when the hole 6 b is provided in the rear surface portion 6 a of the wheel house 6, the air that has flowed into the rear lower portion 1 a of the vehicle 1 from the wheel house 6 can be caused to flow into the flow hole 13. As a result, the vortex W generated behind the vehicle can be blown out by the air flowing out from the outflow hole 21, and an increase in air resistance due to the air flowing into the rear lower portion 1a can be suppressed.

DESCRIPTION OF SYMBOLS 1 Vehicle 5 Car body 11 Rear bumper beam 11a Front surface 11c Upper surface 11d Bottom surface 11e Rib 13 Flow hole 13a Rear side opening (opening)
13b Front opening 13c Open space passage 20 Rear bumper face 21 Outflow hole 23 Reinforced rear bumper beam (rear bumper beam)

Claims (5)

A vehicle bumper structure in which a rear bumper beam capable of absorbing an impact is disposed inside a rear bumper face disposed at the rear of the vehicle,
The rear bumper beam is provided with a flow hole through which air flowing under the vehicle body of the vehicle flows and flows to the vehicle rear side when the vehicle is running,
A vehicular bumper structure, characterized in that an outflow hole is provided in the rear bumper face facing the opening on the rear bumper face side of the flow hole to allow the air flowing out of the opening to flow out to the rear of the vehicle. The circulation hole connects the front opening and the rear opening to the front opening that opens to the front surface of the rear bumper beam, the rear opening that opens to the rear surface of the rear bumper beam, and allows air to flow. The vehicle bumper structure according to claim 1, further comprising: an air passage.   The vehicular bumper structure according to claim 1 or 2, wherein the flow hole is formed by an upper surface and a bottom surface of the rear bumper beam, and a rib disposed inside. The vehicular bumper structure according to claim 2, wherein the air passage has a cross-sectional area different from a cross-sectional area of a front-side passage and a cross-sectional area of a rear-side passage, and changes a flow velocity of air. The vehicular bumper structure according to claim 4, wherein a cross-sectional area of a front passage of the air passage is larger than a cross-sectional area of the rear passage.

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