JP5011937B2 - Bumper structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle bumper structure.

  As a conventional vehicle bumper structure, a skeleton member is arranged along the vehicle width direction behind a bumper cover installed at the front of the vehicle body, and the skeleton member and a lower end portion of the bumper cover are connected by an apron member. It has a structure.

  The apron member is deformed by hitting an obstacle together with a bumper cover at the time of a vehicle collision, and serves to absorb a collision load (for example, see Patent Document 1).

An air intake is formed in the front surface of the bumper cover, and a radiator is supported above the skeleton member. The air introduced from the air intake port when the vehicle travels flows over the apron member, hits the radiator, passes through the radiator, and is then discharged downward at the rear of the radiator.
JP 2002-274298 A

  However, in such a conventional technique, among the air introduced from the air intake port of the bumper cover, the air that flows relatively upward away from the apron member is transferred to the heat exchange part (core part) of the radiator. Although effective, the air flowing relatively downward along the apron member tends to hit the non-heat exchange part (tank part) of the radiator, which is disadvantageous for improving the cooling performance of the radiator.

  The present invention has been made paying attention to such a conventional technique, and an object thereof is to obtain a vehicle bumper structure capable of improving the cooling performance of a radiator.

According to a first aspect of the present invention, a skeletal member for supporting a heat exchanger is disposed on the rear side of a bumper cover having an air intake port along the vehicle width direction, and the lower end portion of the bumper cover and the skeleton member In the vehicle bumper structure in which the apron member is connected to the apron member, the apron member includes an upper protrusion protruding above the skeleton member and a lower protrusion protruding below the skeleton member. The lower protrusion is formed in a direction and has a V-shaped bent shape that protrudes downward, deflects the air flowing below the apron member downward, and separates the air from the lower surface of the skeleton member. A negative pressure portion is generated behind the lower projection, and a holding portion is provided when the apron member is attached to the skeleton member .

  According to the first aspect of the present invention, since the upper protrusion is formed on the apron member, the flow of air introduced from the air intake port of the bumper cover and flowing along the apron member is upward due to the upper protrusion. To be deflected. Therefore, the air flowing relatively downward along the apron member also comes into contact with the heat exchange part of the heat exchanger, and the cooling performance of the heat exchanger is improved.

Further , according to the first aspect of the present invention, since the lower protrusion is formed on the apron member, the flow direction of the air flowing below the apron member is deflected downward by the lower protrusion. Therefore, the air flow along the lower surface of the apron member peels from the lower surface of the skeleton member, and a negative pressure portion is generated behind the lower protrusion. When a negative pressure part arises, discharge | emission of the air behind a heat exchanger will be accelerated | stimulated, the ventilation volume of the heat exchange part of a heat exchanger will increase, and the cooling performance of a heat exchanger will improve.

  Embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of a vehicle body front portion showing a vehicle bumper structure according to the present embodiment, FIG. 2 is a cross-sectional view of the bumper structure taken along the line SA-SA in FIG. 1, and FIG. 3 is an exploded cross-sectional view showing the bumper structure. 4 is a perspective view showing the apron member, and FIG. 5 is a partially enlarged perspective view of the apron member.

  As shown in FIG. 1, a bumper cover 1 constituting a part of the front surface of the vehicle is disposed at the front end of the vehicle. The bumper cover 1 is made of a soft resin, and an air intake 2 that is long in the vehicle width direction is formed on the front surface thereof. The air intake 2 is formed in a flat cylindrical shape protruding rearward from the front surface of the bumper cover 1. A plurality of mounting holes 3 are formed in the lower end portion of the bumper cover 1 at predetermined intervals along the vehicle width direction.

  Behind the bumper cover 1, a radiator lower support 4 as a skeleton member having a closed cross-sectional structure is disposed along the vehicle width direction. A plurality of attachment holes 5 with welding nuts N are formed on the lower surface of the skeleton member 4 along the vehicle width direction at predetermined intervals, and the attachment holes 6 are formed along the vehicle width direction at predetermined intervals on the front surface. Are formed.

  A radiator 7 as a heat exchanger is supported on the upper part of the skeleton member 4. The radiator 7 has a structure having a core portion 9 between upper and lower tank portions 8. The core part 9 is a heat exchange part through which air can pass, and the tank part 8 is a non-heat exchange part through which air does not pass.

  And the lower end part of the bumper cover 1 and the frame | skeleton member 4 are connected by the apron member 10 in the front-back direction. The apron member 10 is a resin molded product, and covers the space between the bumper cover 1 and the skeleton member 4 from the lower side, and also deforms in the front-rear direction at the time of a vehicle collision to absorb the collision load.

  At the front end portion of the apron member 10, an inclined portion 11 that is gradually inclined downward is formed, and a horizontal bumper mounting portion 12 is formed at the rear of the inclined portion 11. A mounting hole 13 with a welding nut N is formed in the bumper mounting portion 12 at a position corresponding to the mounting hole 3 of the bumper cover 1. A rib 14 that is curved corresponding to the bumper cover 1 is erected upward at the front end of the inclined portion 11.

  On the rear side of the bumper mounting portion 12, an upper projection 15 having a bead shape with a trapezoidal cross section is formed straight along the vehicle width direction. The front surface of the upper protrusion 15 is a rear inclined surface 15a. Thereafter, a plurality of bead portions 17 along the vehicle front-rear direction project from the inclined surface 15a to the front bumper mounting portion 12 and the inclined portion 11 at intervals in the vehicle width direction. The bead portion 17 is formed to be lower than the upper protrusion 15. The rear surface of the upper protrusion 15 is a front inclined surface 15c. The vertical position of the lower end of the front inclined surface 15 c of the upper protrusion 15 is provided near the upper end of the skeleton member 4. At the rear of the lower end of the front inclined surface 15c, a step portion 16 extending horizontally to the front surface of the skeleton member 4 is formed rearward, and downward from the rear end of the step portion 16 along the front surface of the skeleton member 4. An extending front mounting portion 18 is formed. That is, a front mounting portion 18 for the front surface of the skeleton member 4 is formed via the step portion 16 immediately after the upper protruding portion 15. An attachment hole 19 corresponding to the attachment hole 6 on the front surface of the skeleton member 4 is formed in the front attachment portion 18.

  From the front mounting portion 18, the front mounting portion 18 is extended straight down as it is and then bent downward into a V shape and projecting downward from the skeleton member 4. It is formed straight along the direction. A plurality of holes 21 are formed at predetermined intervals along the vehicle width direction on the rear side in the vicinity of the lower end of the lower protrusion 20.

  On the rear side of the lower protrusion 20, a lower surface attachment portion (rear end portion of the apron member 10) 22 with respect to the lower surface of the skeleton member 4 is formed. The lower surface mounting portion 22 is planar, and mounting holes 23 corresponding to the mounting holes 5 with welding nuts N on the lower surface of the skeleton member 4 are formed.

  Next, a method for attaching the apron member 10 will be described. First, the apron member 10 is held, and the lower surface attachment portion 22 is brought into contact with the lower surface of the skeleton member 4, and the front surface attachment portion 18 is brought into contact with the front surface of the skeleton member 4. Then, the corresponding attachment holes 5, 23, 6, 19 on the lower surface and the front surface of the skeleton member 4 are aligned with each other, and the attachment holes 6 and 19 on the front surface side are fastened with a clip 24 as a fastening means. The mounting holes 5 and 23 are fastened with bolts T as fastening means.

  Thus, when performing the operation | work which hold | maintains the apron member 10 and it attaches to the frame | skeleton member 4, since the hole part 21 is formed in the rear side position near the lower end of the downward projection part 20, an operator is this hole part. By putting a finger on the 21, it becomes easier to hold the apron member 10 and workability is improved.

  When aligning the attachment holes 5 and 23 on the lower surface side of the skeleton member 4, the attachment holes 23 of the lower surface attachment portion 22 are formed on the lower surface of the skeleton member 4 by elastic deformation around the bending point of the lower protrusion 20. The position can be adjusted with respect to the mounting hole 5. Therefore, even if there is an error in the formation position in the front-rear direction between the mounting holes 5, 23, both can be securely fastened while absorbing the error.

  After the apron member 10 is attached to the skeleton member 4 in this manner, the bumper cover 1 is attached to the apron member 10 from the front. The lower part of the bumper cover 1 than the air intake 2 is inserted into the front end of the apron member 10, and the mounting hole 3 of the bumper cover 1 and the mounting hole 13 of the bumper mounting part 12 of the apron member 10 are aligned. After that, both the mounting holes 3 and 13 are fastened with bolts T as fastening means. In a state where the bumper cover 1 is attached to the apron member 10, the apron member 10 is sufficiently in the interior of the bumper cover 1, and the rib 14 at the front end thereof is located immediately after the front surface of the bumper cover 1.

  In this way, the lower end portion of the bumper cover 1 and the skeleton member 4 are connected via the apron member 10. In this state, the upper surface of the upper protrusion 15 protrudes upward from the skeleton member 4, and the lower end of the lower protrusion 20 protrudes downward from the lower surface of the skeleton member 4.

Of the air introduced from the air intake 2 of the bumper cover 1 when the vehicle is running, the air A that flows relatively upward away from the apron member 10 effectively hits the core (heat exchanging portion) 9 of the radiator. Then, reliable heat exchange is performed through the core portion 9.

  On the other hand, the air B that flows relatively downward along the apron member 10 is originally a fixture (not shown) for the skeleton member 4 of the radiator 7 and a tank part (non-heat exchange part) 8 below the radiator 7. In this embodiment, since the upper protrusion 15 is formed, the flow of the air B hits the rear inclined surface 15a of the upper protrusion 15 and is deflected upward. Since it is guided and deflected by the rear inclined surface 15a of the upper projection 15, the airflow resistance is relatively small, and the air B can be smoothly deflected upward. Accordingly, the air B flowing relatively below also comes into contact with the core portion 9 of the radiator 7 and the cooling performance of the radiator 7 is improved.

  Further, since the lower protrusion 20 is formed on the apron member 10, the flow direction of the air C flowing below the apron member 10 is deflected downward by the lower protrusion 20. Therefore, the flow of the air C along the lower surface of the apron member 10 is separated from the lower surface of the skeleton member 4, and a negative pressure portion M is generated behind the lower protrusion 20. If the negative pressure part M arises, discharge | emission of the air behind the radiator 7 will be accelerated | stimulated, and the ventilation volume which ventilates the core part 9 will increase. Therefore, also in this point, the cooling performance of the radiator 7 is improved.

  As described above, according to the present embodiment, the cooling performance of the radiator 7 is improved.

  The main effects of this embodiment will be summarized below.

  First, according to the vehicle bumper structure of the present embodiment, the apron member 10 includes the upper protrusion 15 that protrudes upward from the skeleton member 4 and extends in the vehicle width direction. Therefore, the air introduced from the air intake 2 of the bumper cover 1 and flowing along the apron member 10 is deflected upward by the upper protrusion 15 in the flow direction. Therefore, the air flowing relatively downward along the apron member 10 also comes into contact with the heat exchange part of the radiator 7, and the cooling performance of the radiator 7 is improved.

  2ndly, according to the bumper structure for vehicles of this embodiment, the apron member 10 is provided with the downward projection part 20 which protrudes below the frame | skeleton member 4 and extends in a vehicle width direction. Therefore, the flow direction of the air flowing below the apron member 10 is deflected downward by the lower protrusion 20. Therefore, the air flow along the lower surface of the apron member 10 peels from the lower surface of the skeleton member 4, and a negative pressure portion M is generated behind the lower protrusion 20. If the negative pressure part M arises, the discharge | emission of the air in the back of the radiator 7 will be accelerated | stimulated, the ventilation volume to the core part (heat exchange part) of a heat exchanger will increase, and the cooling performance of the radiator 7 will improve.

  In the present embodiment, the lower protrusion 20 is behind the upper protrusion 15 and is below the skeleton member 4.

  3rdly, according to this embodiment, the upper protrusion part 15 is the bead shape along the vehicle width direction integrally formed in the apron member 10, and the front is the back inclined surface 15a. Therefore, the air flow can be deflected upward in a state where the ventilation resistance is relatively small.

  Fourthly, according to the present embodiment, the apron member 10 has a lower protrusion portion 20 formed as a V-shaped bent portion, and a lower surface attachment portion 22 for the lower surface of the skeleton member 4 formed behind the apron member 10. Therefore, it is possible to adjust the position of the lower surface mounting portion 22 with respect to the lower surface of the skeleton member 4 by elastic deformation centered on the bending point of the lower projection portion 20, and both can be securely fastened while absorbing errors. .

  In particular, in the present embodiment, a front surface mounting portion 18 formed by extending the front surface of the lower protrusion 20 as a V-shaped bent portion straight upward as it is is attached to the front surface of the skeleton member 4 and is used as a V-shaped bent portion. Since the lower surface mounting portion 22 extended rearward from the upper end of the rear surface of the lower protrusion 20 is mounted on the lower surface of the skeleton member 4, that is, in a direction in which both mounting portions 18, 22 (both mounting surfaces) intersect. Since the structure is provided and provided close to each other, an error absorbing function by elastic deformation around the bending point of the lower protrusion 20 is particularly effective.

  Fifth, a hole 21 is formed near the lower end of the lower protrusion 20. Therefore, foreign matters such as water that may accumulate in the lower protrusion 20 as the V-shaped bent portion can be discharged from the hole 21. In addition, since the hole 21 is formed on the rear side of the lower protrusion 20, when the apron member 10 is attached to the skeleton member 4, the hole 21 of the apron member 10 is held by a finger. This makes it easier to hold the apron member 10 and improves workability.

  Sixth, the hole 21 of the lower protrusion 20 is positioned in the vicinity of the mounting hole 23 of the lower surface mounting portion 22 in the vehicle width direction. For this reason, while holding the finger in the hole 21 of the apron member 10 and holding it, the mounting hole 23 of the lower surface mounting portion 22 of the apron member 10 is held when aligned with the mounting hole 5 of the lower surface of the skeleton member 4. Since the hole portion 21 is close to the attachment hole 23 of the lower surface attachment portion 22, the alignment operation and the fastening operation are facilitated.

  At this time, if the position in the vehicle width direction of the hole 21 of the lower protrusion 20 coincides with the mounting hole 23 of the lower surface mounting part 22, the hole 21 becomes a mark, and the mounting hole 5 on the lower surface of the skeleton member 4. There is an advantage that the alignment operation between the mounting hole 23 of the lower surface mounting portion 22 and the mounting hole 23 becomes easier.

  Conversely, if the position in the vehicle width direction of the hole 21 of the lower protrusion 20 is offset with respect to the mounting hole 23 of the lower surface mounting part 22, the operator places a finger on the hole 21 with one hand. Since the fastening operation can be performed with the other hand while the apron member 10 is held, there is an advantage that the fastening operation is facilitated.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made.

The perspective view of the vehicle body front part which employ | adopted the bumper structure for vehicles which concerns on embodiment of this invention. Sectional drawing of the bumper structure which follows the arrow SA-SA line in FIG. The exploded sectional view of a bumper structure. The perspective view which shows an apron member. The principal part expansion perspective view of the partial cross section which shows an apron member.

Explanation of symbols

1 Bumper cover 2 Air intake 4 Radiator support (frame member)
7 Radiator (heat exchanger)
10 Apron member 15 Upper projection 20 Lower projection 24 Clip (fastening means)
A Air flowing relatively upward B Air flowing relatively downward C Air flowing below the apron member T Bolt (fastening member)
N Weld nut M Negative pressure part

Claims (7)

A vehicle in which a skeletal member for supporting a heat exchanger is disposed above the bumper cover having an air intake port along the vehicle width direction, and the lower end of the bumper cover and the skeleton member are connected by an apron member. For bumper structure,
The apron member is formed with an upper projection protruding upward from the skeleton member and a lower projection protruding downward from the skeleton member, respectively, along the vehicle width direction ,
The lower protrusion has a V-shaped bent shape that protrudes downward, deflects the air flowing below the apron member downward, and separates the air from the lower surface of the skeleton member, thereby rearwardly lowering the lower protrusion. A bumper structure for a vehicle , which generates a negative pressure portion and serves as a holding portion when an apron member is attached to a skeleton member .   2. The vehicle bumper structure according to claim 1, wherein the upper projecting portion has a bead shape that is integrally formed with the apron member along the vehicle width direction, and the front surface is a rear inclined surface. It said lower protrusions are integrally formed on the apron member, attached at its lower attaching portion with respect to the lower surface of the frame member is formed in the rear mounting holes with each other fastening means formed on the lower surface of the lower surface installation part and skeletal member The vehicle bumper structure according to claim 1, wherein the bumper structure is a vehicle bumper structure.   The vehicular bumper structure according to claim 3, wherein a hole is formed near a lower end of the lower protrusion.   The vehicular bumper structure according to claim 4, wherein the hole portion of the lower projection portion is positioned in the vicinity of the attachment hole of the lower surface attachment portion.   The vehicular bumper structure according to claim 4, wherein the hole portion of the lower protrusion portion has a vehicle width direction position that coincides with an attachment hole of the lower surface attachment portion.   The vehicular bumper structure according to claim 4, wherein the hole portion of the lower protrusion portion is offset in the vehicle width direction position with respect to the attachment hole of the lower surface attachment portion.

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