JP2011020647A - Vehicular rear bumper structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular rear bumper structure, which enhances the degree of freedom in design of a rear bumper, while air in the inside of the rear bumper can be sucked by traveling wind and an exhaust performance of a ventilator for removing air inside a vehicle can be improved. <P>SOLUTION: In the vehicular rear bumper structure, the lower end 1K of the rear bumper 1 projects downwardly with respect to the lower end 2K of a rear vehicle body 2 on a front side Fr. A bumper extension 15 provided along the rear bumper 1 is attached to the rear side of the lower end 1K of the rear bumper 1, and the upper end 17 of a transverse center of the bumper extension 15 is downwardly positioned diagonally behind the lower end 2K of the rear vehicle body 2. Air between the rear bumper 1 and the rear vehicle body 2 is removed by traveling wind from between the upper end 17 of the transverse center of the bumper extension 15 and the lower end 2K of the rear vehicle body 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention
The present invention relates to a rear bumper structure for an automobile in which a lower end portion of a rear bumper is protruded downward with respect to a lower end portion of a front rear vehicle body.

In an automobile in which the lower end portion of the rear bumper protrudes downward from the lower end portion of the front rear vehicle body, the traveling wind is caused by the lower end portion of the protruding rear bumper to cause the running wind to flow between the interior space of the rear bumper (the rear bumper and the rear vehicle body having a concave vertical section). Space). That is, traveling wind blows from the protruding lower end of the rear bumper and the lower end of the rear vehicle body toward the inner space of the rear bumper.
For this reason, unless a discharge path for traveling wind from the interior space of the rear bumper is secured, the air pressure in the internal space rises, and a ventilation device that operates depending on the pressure difference between the outside of the vehicle (the interior space of the rear bumper) and the inside of the vehicle ( Exhaust performance of a ventilation device for extracting air from the vehicle is reduced.
For example, if the rear bumper has a license plate attached to it, the rear bumper has a relatively large opening for irradiating the license plate with the light from the license lamp located on the back of the rear bumper. The outflow (discharge) of air is possible, and the discharge path of the traveling wind blown into the interior space of the rear bumper is easily secured. Therefore, an increase in the air pressure in the interior space of the rear bumper due to the traveling wind was suppressed, and the exhaust performance of the ventilation device was not reduced. Further, as disclosed in Patent Document 1, the opening between the lower end portion of the rear bumper and the lower end portion of the front rear vehicle body is closed with a cover (connecting member) in order to prevent running air from being blown into the rear bumper. It can also be configured to close the internal space.

Japanese Patent No. 3912030

However, according to the above-described conventional structure, in the rear bumper having no license lamp opening, it is necessary to provide a separate opening to secure a discharge path for the traveling wind blown into the inner space of the rear bumper. In a structure in which the opening between the lower end portion of the rear bumper and the lower end portion of the front rear vehicle body is completely covered with a cover, a large cover member is required. Also, when redesigning the rear bumper with a common vehicle body without using a cover member, the lower end of the rear bumper is raised to some extent, and the running wind is blown into the interior space of the rear bumper in relation to the height of the lower end of the rear vehicle body. It was necessary to prevent them from getting involved, and the degree of freedom in designing the rear bumper was low.
An object of the present invention is to prevent the running wind from being caught in the interior space of the rear bumper, and further to suck out the air in the interior space of the rear bumper by the running wind, thereby improving the exhaust performance of the ventilation device for extracting the air in the vehicle. An object of the present invention is to provide a rear bumper structure for an automobile that can increase the degree of freedom in designing a rear bumper while having a structure that can be improved.

The feature of the present invention is that
A rear bumper structure of an automobile in which a lower end portion of a rear bumper protrudes downward with respect to a lower end portion of a front rear vehicle body,
A bumper extension along the rear bumper is attached to the back side of the lower end of the rear bumper,
An upper end portion of the left and right center portion of the bumper extension is disposed obliquely below and rearward of a lower end portion of the rear vehicle body, and air between the rear bumper and the rear vehicle body has an upper end portion of the left and right center portion of the bumper extension and the rear vehicle body. It is in the point comprised so that it may be sucked out by the driving | running | working wind from between the lower end parts. (Claim 1)

With the above configuration, the inflow of traveling wind into the interior space of the rear bumper is reduced, and further, the air between the rear bumper and the rear vehicle body is disposed at the left and right central portions of the bumper extension (near the center of the vehicle in the left and right direction of the vehicle). Part) is sucked out by the flow of traveling wind from between the upper end of the rear part and the lower end of the rear vehicle body.
According to the above configuration, since the bumper extension along the rear bumper is attached to the back side of the lower end portion of the rear bumper, the upper end portion of the left and right central portion of the bumper extension can be positioned above the lower end portion of the rear bumper, The opening between the lower end portion of the rear bumper and the lower end portion of the rear vehicle body can be reduced.
As a result, even when the lower protrusion of the rear bumper with respect to the lower end of the rear vehicle body is extended downward, it is difficult for the wind to flow into the internal space of the rear bumper (the space between the rear bumper and the rear vehicle body). be able to.
Thereby, when the design of the rear bumper is renewed while sharing the vehicle body, the lower end portion of the rear bumper does not have to be disposed at a high position close to the height of the lower end portion of the rear vehicle body. That is, the lower end portion of the rear bumper can be arranged at a low position, and the degree of freedom in designing the rear bumper can be increased.
Also, since the air in the interior space of the rear bumper is sucked out near the center of the left and right of the vehicle, there is no wheel ahead and the flow of the running wind is relatively stable, so the air sucking action by the running wind is stabilized. Can do.
By the way, as the vertical distance between the upper end portion of the left and right central portion of the bumper extension and the lower end portion of the rear vehicle body becomes shorter, the amount of running wind sucking out the air in the interior space of the rear bumper increases, and the ventilation performance in the vehicle is improved. However, if the amount of air sucked out is too large, the air pressure in the inner space of the rear bumper will drop, and the outside air will flow into the rear bumper through the gap at the upper end of the rear bumper, causing snow to enter the inner space of the rear bumper. May occur.
On the other hand, according to the above configuration of the present invention, since the rear bumper and the bumper extension are separate parts, the distance between the vertical direction and the distance between the upper end portion of the left and right central portion of the bumper extension and the lower end portion of the rear vehicle body are set. Fine adjustment can be easily performed, and the amount of air sucked into the interior space of the rear bumper can be easily set to an optimum amount.
In addition, since the rear bumper and bumper extension are separate parts, the rear bumper and bumper extension can be easily molded even if the rear bumper structure consisting of both is complicated, and the molding cost can be reduced. . (Claim 1)

In the present invention,
Of the opening between the lower end portion of the rear bumper and the lower end portion of the rear vehicle body, an opening portion located behind the rear wheel or above the exhaust pipe is a bumper extension portion located behind the rear wheel or above the exhaust pipe. When closed, the following effects can be achieved. (Claim 2)

Mud, dust, water, etc. that are wound up from the rear wheel and fly from the front are received by the bumper extension part, and mud, dust, water, etc. can be prevented from entering the interior space of the rear bumper. Water or the like can be prevented from entering the vehicle interior from the opening of the ventilation device (ventilation device that discharges air inside the vehicle to the outside of the vehicle).
Further, the air current disturbed by the rear wheel can be prevented from entering the inner space of the rear bumper, and the flow of the traveling wind into the inner space of the rear bumper can be reduced, so that the effect of the first aspect can be easily achieved. be able to. And it can prevent that engine exhaust enters a vehicle interior from a ventilator. (Claim 2)

In the present invention,
When the upper end portion of the bumper extension portion is disposed close to the lower end portion of the rear vehicle body and overlapped with the lower end portion of the rear vehicle body in the vertical direction, the following effects can be obtained. (Claim 3)

It makes it easy to prevent mud, dust, water, etc. from entering from the upper end side of the opening located behind the rear wheel or above the exhaust pipe among the openings between the lower end of the rear bumper and the lower end of the rear vehicle body. It is possible to prevent mud, dust, water and the like from entering the inside of the vehicle through the opening of the ventilation device.
Further, the air current disturbed by the rear wheel can be prevented from entering the internal space of the rear bumper from the upper end portion side of the opening portion, and the flow of running air into the internal space of the rear bumper is reduced, and the above claim. The effect of 2 can be made easier. Then, it is possible to prevent engine exhaust from entering the vehicle through the ventilation device. (Claim 3)

In the present invention,
If the opening of the ventilation device that discharges the air inside the vehicle to the outside of the vehicle is formed in the rear vehicle body part behind the rear wheel or above the exhaust pipe, the following action can be achieved. (Claim 4)

  Since the ventilator opening was placed in a position shifted in the left-right direction with respect to the opening near the left and right center of the vehicle from which the air inside the rear bumper was sucked out, the air passage was relatively opened using the inner space of the rear bumper. It can be formed longer and can prevent sound and dust from entering the vehicle. (Claim 4)

In the present invention,
A groove opened on the rear side of the vehicle is provided at the lower end of the rear vehicle body,
When the upper end portion of the bumper extension portion is disposed inside the groove, the following operation can be achieved. (Claim 5)

A labyrinth can be easily formed between the upper end portion of the bumper extension portion and the lower end portion of the rear vehicle body, and traveling wind and engine exhaust can be more difficult to enter the interior space of the rear bumper.
Further, since the groove is opened rearward in accordance with the assembling direction of the rear bumper or the like, the assembling property can be improved. (Claim 5)

  According to the present invention, it is possible to prevent the running wind from being caught in the interior space of the rear bumper, and further to suck out the air in the interior space of the rear bumper by the running wind, thereby improving the exhaust performance of the ventilation device for extracting the air in the vehicle. Although the structure can be improved, the rear bumper structure of an automobile that can increase the degree of freedom in designing the rear bumper has been provided.

An exploded perspective view of the rear part of the vehicle body A-B sectional view of FIG. A-D sectional view of FIG. A-C sectional view of FIG. Car rear view 5A is a sectional view taken along line GG in FIG. 5B is a sectional view taken along line FF in FIG. 5C is a sectional view taken along line EE in FIG. (A) is HH sectional drawing of FIG. 5, (b) is JJ sectional drawing of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 1, a rear bumper 1, a back panel 2 that forms a rear cargo compartment of a vehicle, a pair of left and right rear linings 3, and a bumper extension 4 that is attached to the back side of a lower end 1 </ b> K of the rear bumper 1 are provided. The rear structure of the automobile is constructed.

  An opening 5 for a back door is formed in the back panel 2. The rear lining 3 is attached to the back panel 2 by a clip, and as shown in FIG. 3, receives the dust, snow, etc. wound up by the rear wheel 6 and prevents the rear bumper 1 from entering the internal space A. . This rear lining 3 can prevent a malfunction from occurring in a ventilation function of a later-described ventilator 7 (corresponding to a ventilation device).

  The rear bumper 1 is attached to the vehicle body such as the back panel 2 by a clip, and has a function of softening the impact and protecting the vehicle body when the vehicle collides with another object, and covering the functional components inside the rear bumper 1 Has a function to improve. 2 to 4, the lower end 1K of the rear bumper 1 is placed below the lower end 2K of the back panel 2 and the lower end 3K of the rear lining 3 in the front Fr (vehicle front side Fr). The appearance is further improved by projecting.

[Ventilation system structure]
As shown in FIGS. 1 to 4, a ventilator 7 (corresponding to a ventilator) that discharges the air in the passenger compartment to the outside of the vehicle is disposed above the rear wheel 6. The ventilator 7 is covered by the rear bumper 1 and has a valve function for discharging the air inside the vehicle into the rear bumper 1 using the pressure difference between the inside and outside of the vehicle and preventing the air inside the rear bumper 1 from flowing back into the vehicle. ing.

  The ventilator 7 is attached to an opening formed in a back panel portion (corresponding to a rear vehicle body portion) facing the rear of the vehicle substantially behind the rear wheel 6 and is a rectangular opening that discharges air in the vehicle interior to the outside of the vehicle. 8 and the upper end of the opening 8 is swingably attached to the opening 8 so as to cover the opening 8, and when the air pressure in the vehicle interior becomes higher than the air pressure outside the vehicle, the lower end is moved to the vehicle rear side Rr by the action of the air pressure difference. And a plurality of thin film valves 9 that swing to open the opening 8. A plurality of thin film valves 9 are arranged on the upper and lower sides, and close the opening 8 when the air pressure in the passenger compartment becomes equal to or lower than the air pressure outside the vehicle. Then, the air in the passenger compartment that has passed through the opening 8 in which the valve 9 is opened flows into the back side of the rear bumper 1 and is discharged outside the vehicle through the space between the back panel 2 and the rear bumper 1 (the interior space of the rear bumper). The opening 8 may be formed in a back panel portion (corresponding to a rear vehicle body portion) above the exhaust pipe 10.

  The ventilator 7 adjusts the air pressure inside the vehicle by releasing the air inside the vehicle when the door is closed. Thereby, the closing performance of the door is improved. Further, the ventilator 7 discharges the air in the vehicle when the outside air such as an air conditioner is introduced, adjusts the atmospheric pressure in the vehicle, facilitates the introduction of the outside air, and improves the air conditioner performance. In addition, as described above, the inside of the vehicle is ventilated by sucking out the air in the vehicle from the ventilator 7 using the negative pressure generated outside the vehicle during traveling.

  In an automobile in which the lower end portion 1K of the rear bumper 1 is protruded downward with respect to the lower end portion 2K of the back panel 2 of the front Fr and the lower end portion 3K of the rear lining 3, the traveling wind is an internal space A (vertical sectional concave shape). In the inner space A) between the rear bumper 1 and the back panel 2 (or rear lining 3). For this reason, the air pressure in the internal space A rises unless a discharge path for traveling wind from the internal space A of the rear bumper 1 is secured, and the exhaust performance of the ventilator 7 that depends on the pressure difference between the outside and the inside of the vehicle decreases. To do.

  In the case of an automobile in which a license plate is attached to the rear bumper, a hole for a license lamp for illuminating the license plate is formed in the rear bumper portion above the license plate mounting portion. A discharge path for traveling wind in the space A is easily secured. However, in the rear bumper 1 that does not have a hole for the license lamp, it is necessary to separately secure a traveling air discharge path in the inner space A of the rear bumper 1.

Since the rear bumper 1 of the automobile of the present invention does not have a hole for a license lamp, it is configured as follows. That is, as shown in FIG. 2, the bumper extension 4 along the rear bumper 1 is attached to the back side (vehicle front side) of the lower end 1K of the rear bumper 1, and the left and right central portions of the bumper extension 4 (the center of the vehicle in the left and right direction of the vehicle). The upper portion of the upper portion of the first extension portion 15 described later (see FIG. 1 and FIG. 2) is diagonally below the lower end portion 2K at a distance from the lower end portion 2K of the back panel 2. The air in the interior space A of the rear bumper 1 is sucked out by the flow of traveling wind from between the upper end portion of the left and right center portion of the bumper extension 4 and the lower end portion 2K of the back panel 2.
That is, the bumper extension 4 not only prevents the running wind from being blown into the inner space A of the rear bumper 1, but also uses the running wind flowing in the vicinity of the lower end portion 1K of the rear bumper 1 to remove the air in the inner space A of the rear bumper 1. The ventilation performance of the ventilator 7 is further improved by sucking out.

[Bumper extension 4 structure]
As shown in FIG. 1, the bumper extension 4 has a split structure, and a pair of substantially symmetrical split extensions 14 in the longitudinal direction (ends on the vehicle center side) are connected by a screw S. It is configured.

[Structure of left and right central part of bumper extension 4]
As shown in FIGS. 1, 2, 5, and 6 (b), the first extension portion 15 on one end side of the divided extension 14 is disposed at the left and right center portion of the automobile and is located near the center in the vehicle width direction. A bumper extension 4 disposed on the back side of the lower end 1K of the rear bumper 1 is configured. The first extension portion 15 includes a front wall 16, an upper wall 17 extending from the upper end of the front wall 16 toward the rear surface of the rear bumper 1 toward the vehicle rear side Rr, and a lower end 1K of the rear bumper 1 from the lower end of the front wall 16. And a plurality of ribs (not shown) provided between the upper and lower walls 17 and 18, and the length of the upper wall 17 in the vehicle front-rear direction is long. It is set longer than the length of the lower wall 18. Even if the lower end 1K of the rear bumper 1 is set relatively downward by the bumper extension 4 of the part, the distance between the lower end 1K of the rear bumper 1 and the lower end 2K of the back panel 2 can be reduced. Thus, the inflow of traveling wind into the internal space A of the rear bumper 1 can be reduced.

  A connecting wall 20 rises from an end wall of the first extension portion 15 (an end portion of the split extension 14 on the vehicle center side), and a screw hole is formed in the connecting wall 20. As shown in FIGS. 1 and 6 (c), the connecting wall 20 of the pair of left and right first extension portions 15 stacked on each other is connected to the rising wall 50 of the rear bumper 1 (from the lower end 1K of the rear bumper 1 to the back panel 2). A portion fixed to the back panel 2 extending toward the lower end 2K is attached to the vehicle rear side Rr by a screw S from the vehicle front side Fr. On one connecting wall 20, a boss 51 having a screw hole is formed so as to reach the vicinity of the rear surface of the rear bumper 1. The durability of the rising wall 50 is improved by the connecting wall 20 and the boss 51.

As shown in FIG. 2, a back panel 2 (corresponding to a rear vehicle body) is positioned in front Fr of the rear bumper 1 at the left and right center portion of the vehicle where the pair of left and right first extension portions 15 connected to each other is located. The lower end 1K protrudes downward with respect to the lower end 2K of the back panel 2 of the front Fr.
Then, the upper wall 17 of the first extension portion 15 is disposed obliquely below the lower end 2K of the back panel 2 in the longitudinal section, and air between the rear bumper 1 and the back panel 2 (internal space of the rear bumper 1). A air) is sucked out by the traveling wind from between the front corner portion 17C of the upper wall 17 and the lower end portion 2K of the back panel 2. Reference numeral B denotes a flow of traveling wind. As the vehicle travels, traveling wind flows relative to the vehicle body from the front of the vehicle, and the traveling wind passes below the lower end 2K of the back panel 2 and the lower end 1K of the rear bumper 1 and flows to the rear of the vehicle. At this time, since the traveling wind that has flowed in front of the back panel 2 flows downward, the air flows downward and obliquely downward and downward from the lower end 2K of the back panel 2 and from the lower end 1K of the rear bumper 1. The downward flow is further enhanced and stabilized by the front wall 16, and the air in the inner space A of the rear bumper 1 is sucked out by the traveling wind from between the front wall 16 and the lower end 2 </ b> K of the back panel 2. Because of the downward flow described above, the inflow of traveling wind into the internal space A of the rear bumper 1 can be prevented even if the upper wall 17 is disposed below the lower end 2K of the back panel 2.

[Structure on the left and right end sides of the bumper extension 4]
As shown in FIGS. 1, 3, and 5, the second extension portion 21 on the other end side of the split extension 14 (corresponding to the outer end portion in the vehicle width direction of the bumper extension 4 in the vehicle width direction) is It arrange | positions at the edge part on either side, and is located behind the rear-wheel 6. FIG. The second extension portion 21 is formed in the shape of an inclined vertical wall positioned below the rear side Rr of the vehicle, and the inner portion in the vehicle width direction of the second extension portion 21 matches the shape of the lower end portion of the rear bumper 1. The portion on the outer side in the vehicle width direction is bent in an arc shape located on the vehicle front side Fr toward the outer side in the vehicle width direction.

  On the left and right end sides of the vehicle where the second extension portion 21 is located, a rear lining 3 (corresponding to the rear vehicle body) that covers the inner surface of the wheel house is located in front Fr of the rear bumper 1, and a lower end 1K of the rear bumper 1 is It projects downward with respect to the lower end 3K of the rear lining 3 of the front Fr.

  Further, an opening portion 41 </ b> A located behind the rear wheel 6 in the opening 41 between the lower end portion 1 </ b> K of the rear bumper 1 and the lower end portion 3 </ b> K of the rear lining 3 is closed by the second extension portion 21. The upper end portion of the second extension portion 21 is disposed close to the lower end portion 3K of the rear lining 3 and overlaps the lower end portion 3K of the rear lining 3 in the vertical direction.

That is, the upper end portion of the second extension portion 21 is bent to the vehicle front side Fr to form the flange 21F1 extending to the vehicle front side Fr, and the lower end portion 3K of the rear lining 3 is bent to the vehicle rear side Rr. A flange 3F extending to the rear side Rr is formed, and the flange 21F1 at the upper end portion of the second extension portion 21 is disposed above the flange 3F at the lower end portion 3K of the rear lining 3 and is opposed from above.
Further, a lower end portion of the second extension portion 21 is bent to the vehicle rear side Rr to form a flange 21F2 extending to the vehicle rear side Rr, and a bumper portion 1F extending to the vehicle front side Fr formed at the lower end portion 1K of the rear bumper 1 is formed. The flange 21F2 is overlaid from above.

[Structure of the middle part of the bumper extension 4 in the vehicle width direction]
As shown in FIGS. 1, 4, and 5, a third extension portion 22 (corresponding to a bumper extension portion) between the first extension portion 15 and the second extension portion 21 of the split extension 14 is an intermediate in the vehicle width direction of the automobile. Is disposed above the exhaust pipe 10 (between the left and right ends of the bumper extension 4 and the central portion of the left and right). The third extension portion 22 is formed in the shape of an inclined vertical wall positioned below the vehicle rear side Rr. The inclination angle of the third extension portion 22 with respect to the vehicle longitudinal direction is set to be gentler (smaller) than the inclination angle of the second extension portion 21 because there is no rear lining 3.

In the vehicle width direction intermediate portion of the automobile where the third extension portion 22 is located, the back panel 2 (corresponding to the rear vehicle body) is located in the front Fr of the rear bumper 1, and the lower end 1K of the rear bumper 1 is the front Fr of the back panel 2 of the front Fr. It protrudes downward with respect to the lower end 2K.
Further, the third extension portion 22 closes the opening portion 41B located above the exhaust pipe 10 in the opening 41 between the lower end portion 1K of the rear bumper 1 and the lower end portion 2K of the back panel 2. The upper end portion of the third extension portion 22 is disposed close to the lower end portion 2K of the back panel 2 and overlaps the lower end portion 2K of the back panel 2 in the vertical direction.

  That is, the upper end portion of the third extension portion 22 is bent to the vehicle front side Fr to form a flange 22F1 extending to the vehicle front side Fr, and the vehicle rear side Rr is open to the lower end portion 2K of the back panel 2 And the flange 22F1 of the third extension portion 22 is disposed in the groove 23. The groove 23 can be formed of a bead that is convex on the vehicle front side Fr.

  Thus, a labyrinth is formed between the upper end portion of the third extension portion 22 and the lower end portion 2K of the back panel 2, and the opening 41 can be closed. It can be difficult to get into. In addition, since the groove 23 is opened toward the rear Rr in accordance with the assembly direction of the rear bumper 1 and the like, the assembly performance can be improved.

  A lower end portion of the third extension portion 22 is bent to the vehicle rear side Rr to form a flange 22F2 extending to the vehicle rear side Rr, and a bumper portion 1F extending to the vehicle front side Fr formed at the lower end portion 1K of the rear bumper 1 is formed. The flange 22F2 is overlaid from above.

[Bumper extension 4 mounting structure]
The attachment structure of the bumper extension 4 to the lower end portion 1K of the rear bumper 1 will be described. As shown in FIGS. 1 and 6C, the connecting wall 20 of the pair of left and right first extension portions 15 that overlap each other is formed as the rear bumper 1. Is attached to the rising wall 50 with a screw S from the vehicle front side Fr. One connecting wall 20 is formed with a boss 51 having a screw hole.
As shown in FIGS. 1 and 6A, the vicinity of the boundary between the third extension portion 22 and the first extension portion 15 is connected to the connecting portion 52 of the lower end 1K of the rear bumper 1 from the vehicle front side Fr to the screw S. It is attached with.
As shown in FIG. 7A, an engaging claw 53 provided in the vicinity of the boundary between the second extension portion 21 and the third extension portion 22 is formed on the base 54 of the lower end portion 1K of the rear bumper 1. The engaging hole 54H is inserted and engaged from above.
The pedestal 54 is a fixed portion to the back panel 2 that extends from the lower end 1K of the rear bumper 1 toward the lower end 2K of the back panel 2. The pedestal 54 has a rear lining on the upper end thereof. 3 is also formed, and the attachment portion 2T of the back panel 2 and the attachment portion 3T of the rear lining 3 are overlapped on the attachment portion 55 and fixed together with a clip C.
Further, as shown in FIGS. 1 and 7B, the attachment portion 21T of the second extension portion 21 is fixed to the attachment portion 56 of the rear bumper 1 with a screw S from the vehicle front side Fr. The part is a tightening / fixing portion for fastening the outermost ends of the rear bumper 1 and the bumper extension 4 in the vehicle width direction, and the attachment portion 21T is in the upper half of the bumper extension 4 as a boss having a screw hole. Thus, the coupling rigidity between the rear bumper 1 and the bumper extension 4 is improved.

With the above configuration, the air in the inner space A of the rear bumper 1 is sucked by the traveling wind between the upper end portion of the left and right center portion of the bumper extension 4 (the upper wall 17 of the first extension portion 15) and the lower end portion 2K of the back panel 2. Is issued.
According to the above configuration, since the bumper extension 4 along the rear bumper 1 is attached to the back side of the lower end portion 1K of the rear bumper 1, the upper end portion (the upper wall 17 of the first extension portion 15) of the left and right central portion of the bumper extension 4 is attached. ) Can be positioned above the lower end 1K of the rear bumper 1. As a result, even when the downward protruding length of the lower end portion 1K of the rear bumper 1 relative to the lower end portion 2K of the back panel 2 is increased, it is possible to make it difficult for the traveling wind to be caught in the internal space A of the rear bumper 1.

Thereby, when the design of the rear bumper 1 is renewed with a common vehicle body, the lower end portion 1K of the rear bumper 1 does not have to be arranged at a high position. That is, the lower end 1K of the rear bumper 1 can be arranged at a low position, and the degree of freedom in designing the rear bumper 1 can be increased.
In addition, in the vicinity of the left and right central parts of the automobile from which the air in the internal space A of the rear bumper 1 is sucked, there is no rear wheel 6 in the front and the flow of the traveling wind is relatively stable. Can be stabilized.

As shown in FIG. 2, as the length L (the vertical distance) between the upper wall 17 of the first extension portion 15 and the lower end portion 2K (the lower end edge) of the back panel 2 becomes shorter, the traveling wind B becomes more rear bumper 1. The amount of air sucked in the interior space A increases and the ventilation performance in the vehicle increases. However, if the amount of air sucked is excessive, outside air is sucked into the rear bumper 1 from the gap 60 at the upper end of the rear bumper 1. There is a possibility that a problem that snow enters from the gap 60 may occur.
In the present invention, since the rear bumper 1 and the bumper extension 4 are separate components, the length L can be finely adjusted, and the amount of air sucked into the internal space A of the rear bumper 1 can be set to an optimum amount. .

  Then, the mud, dust, water, etc. that are wound up from the rear wheel 6 and fly from the front Fr are received by the second extension part 21 and the third extension part 22, and the mud, dust, water, etc. enter the inner space A of the rear bumper. This can prevent mud, dust, water, and the like from entering the inside of the vehicle through the opening 8 of the ventilator 7.

  Further, the air current disturbed by the rear wheel 6 can be prevented from entering the internal space A of the rear bumper 1, and the flow of traveling air into the internal space A of the rear bumper 1 can be reduced, and the above-described action can be further achieved. It can be made easier. The engine exhaust can be prevented from entering the vehicle from the ventilator 7.

  The lower end portion 2K of the back panel 2 protrudes downward from the floor panel, and the flow of traveling wind toward the lower side of the rear bumper 1 is also generated by the front surface of the back panel 2, so that the air sucking effect can be further exhibited.

1 Rear bumper 1K Lower end 2 of rear bumper Rear body (back panel)
2K Lower end of rear car body 3 Rear car body (rear lining)
3K Lower end of rear car body 4 Bumper extension 6 Rear wheel 7 Ventilator
8 opening (opening of ventilation device)
10 Exhaust pipe 17 Upper end 21 at the center of the left and right of the bumper extension Bumper extension part (second extension part)
21F Upper end of bumper extension (upper end of second extension)
22 Bumper extension part (third extension part)
22F Upper end of bumper extension (upper end of third extension)
23 Groove 41 Opening 41A between the lower end of the rear bumper and the lower end of the rear vehicle body Opening portion 41B positioned behind the rear wheel Opening portion Fr positioned above the exhaust pipe Front

Claims (5)

A rear bumper structure of an automobile in which a lower end portion of a rear bumper protrudes downward with respect to a lower end portion of a front rear vehicle body,
A bumper extension along the rear bumper is attached to the back side of the lower end of the rear bumper,
An upper end portion of the left and right center portion of the bumper extension is disposed obliquely below and rearward of a lower end portion of the rear vehicle body, and air between the rear bumper and the rear vehicle body has an upper end portion of the left and right center portion of the bumper extension and the rear vehicle body. The rear bumper structure of the motor vehicle comprised so that it may be sucked out by the driving | running | working wind from between the lower end parts.   Of the opening between the lower end portion of the rear bumper and the lower end portion of the rear vehicle body, an opening portion located behind the rear wheel or above the exhaust pipe is a bumper extension portion located behind the rear wheel or above the exhaust pipe. 2. The rear bumper structure of an automobile according to claim 1, wherein the rear bumper structure is closed.   The rear bumper structure for an automobile according to claim 2, wherein an upper end portion of the bumper extension portion is disposed close to a lower end portion of the rear vehicle body and overlaps with a lower end portion of the rear vehicle body in the vertical direction.   4. A rear bumper structure for an automobile according to claim 2, wherein an opening of a ventilation device for discharging air inside the vehicle to the outside of the vehicle is formed in a rear vehicle body portion behind the rear wheel or above the exhaust pipe. A groove opened on the rear side of the vehicle is provided at the lower end of the rear vehicle body,
The rear bumper structure of the automobile according to any one of claims 2 to 4, wherein an upper end portion of the bumper extension portion is disposed inside the groove.

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