JP6435285B2 - Bumper structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle bumper structure.

  The vehicle bumper structure includes a bumper beam extending in the vehicle width direction, and a bumper face disposed outside the bumper beam. The bumper beam includes an outer member and an inner member arranged in parallel in the vehicle longitudinal direction. Are formed by joining (see, for example, Patent Document 1).

Japanese Patent No. 4366082

  In the conventional vehicle bumper structure described above, the outer member is formed of a high-tensile steel plate having the same strength as the inner member. Thus, when the outer member is formed of a high-strength steel plate, there is a problem that it is difficult to form the outer member in accordance with the shape of the bumper face.

  It is an object of the present invention to provide a vehicle bumper structure that can solve the above-described problems and can easily form a bumper beam according to the shape of the bumper face.

In order to solve the above-mentioned problems, the present invention is a vehicle bumper structure provided with a bumper beam that is disposed at a front portion of a vehicle body and extends in the vehicle width direction. The bumper beam includes an inner member and an outer member joined to the front side in the vehicle front-rear direction with respect to the inner member. And the intensity | strength of the said outer side member is set so that it may become smaller than the intensity | strength of the said inner side member. A plurality of buffer members are arranged in parallel in the vehicle width direction on the front surface of the outer member, and a guide member for guiding air to a power source of the vehicle is disposed in front of the outer member. The guide member extends in the vehicle height direction through between the adjacent buffer members. The buffer member is provided with the first buffer member inclined downward toward the front of the vehicle and the second buffer member inclined upward toward the vehicle front.

In the vehicle bumper structure of the present invention, since the strength of the outer member is suppressed, it is easy to form the outer member in accordance with the shape of the bumper face arranged on the front side of the bumper beam.
Thereby, in the vehicle bumper structure of the present invention, the distance between the inner surface of the bumper face and the front end surface of the bumper beam can be reduced, so that the collision energy at the time of the vehicle collision can be effectively reduced from the bumper face to the bumper beam. Can communicate well.
In the vehicle bumper structure of the present invention, when the tip surface of the bumper beam is in contact with the inner surface of the bumper face, the transmission efficiency of the collision energy from the bumper face to the bumper beam can be increased.
Moreover, since the freedom degree of arrangement | positioning of a guide member increases, air can be efficiently sent with respect to a motive power source.
Moreover, in the vehicle bumper structure of the present invention, since the plate thickness of the outer member can be reduced, when the outer member and the buffer member are made of steel, the buffer member is resistance-welded to the outer member. Can do.
In addition, the shock absorbing performance of the bumper beam can be enhanced by arranging the buffer members having different shapes in accordance with the shape of each part of the bumper face.

In the vehicle bumper structure of the present invention, the outer member is easily deformed at the time of a vehicle collision, and therefore, the collision energy can be efficiently absorbed.
In the vehicle bumper structure of the present invention, the collision energy can be reliably received by the inner member when the vehicle collides.
Thus, in the vehicle bumper structure of the present invention, the bumper beam can be prevented from moving backward while efficiently absorbing the collision energy by the bumper beam.

  In the vehicle bumper structure of the present invention, the outer member can be easily formed according to the shape of the bumper face, so that it is not necessary to process the outer member according to the shape of the bumper face after manufacturing the bumper beam.

In the vehicle bumper structure of the present invention, the outer member and the inner member can be formed with different plate thicknesses and materials.
For example, the shock absorbing performance of the bumper beam can be enhanced by forming the outer member with a material having good moldability and high toughness, and forming the inner member with a material having high tensile strength.

  In the vehicle bumper structure of the present invention, since the bumper beam is divided into the outer member and the inner member, a reinforcing member can be provided in the bumper beam before the outer member and the inner member are joined.

In the vehicle bumper structure of the present invention, when the upper plate and the lower plate are protruded forward or backward from the upper and lower edges of the inner member, the strength of the inner member can be increased.
In addition, when the outer member is inserted between the upper plate and the lower plate of the inner member, the outer member can be prevented from being deformed in the vertical direction at the time of a vehicle collision, so that collision energy is efficiently transmitted to the inner member. can do.
Furthermore, when the outer member is inserted between the upper plate and the lower plate of the inner member, the joint portion between the outer member and the inner member does not protrude from the upper surface and the lower surface of the bumper beam, so that the air around the bumper beam is smooth. Flowing into.

  In the vehicle bumper structure described above, when the central portion of the bumper face protrudes, the outer member protrudes toward the front of the vehicle from both ends in the vehicle width direction toward the central portion. Can be matched to the shape of

  Further, in the above-described configuration, the distal end surface of the outer member is formed in an arch shape, so that the outer member is easily deformed when the vehicle collides, and the outer member becomes larger in the front-rear direction. As a result, the central moment of the bumper beam is increased in the cross-sectional secondary moment, and both end portions of the bumper beam are less likely to buckle, so that collision energy can be absorbed efficiently.

  In the vehicle bumper structure described above, it is preferable that the inner member is fixed to a flange formed at an end portion of the side member.

  Thus, by directly connecting the bumper beam to the side member, it is possible to increase the rigidity of the connecting portion between the bumper beam and the side member and to reduce the connecting portion between the bumper beam and the side member.

In the vehicle bumper structure of the present invention, since the strength of the outer member is suppressed, the outer member can be formed to match the shape of the bumper face, and collision energy can be efficiently transmitted from the bumper face to the bumper beam. Can do.
Further, in the vehicle bumper structure of the present invention, the bumper beam can efficiently absorb the collision energy, and the bumper beam can be prevented from moving backward.

It is the perspective view which looked at the bumper structure concerning the embodiment of the present invention from the upper left front. It is the disassembled perspective view which looked at the bumper structure concerning the embodiment of the present invention from the upper left front. It is the top view which showed the bumper beam which concerns on embodiment of this invention. 4A and 4B are views showing a bumper beam according to an embodiment of the present invention, in which FIG. 3A is a cross-sectional view taken along the line AA in FIG. It is the perspective view which looked at the connection part of the bumper beam and front side member which concern on embodiment of this invention from the upper right back. It is the figure which showed the modification of embodiment of this invention, and is a sectional side view of the structure which applied the bumper structure of this invention to the vehicle body rear part.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
The bumper structure 1 of this embodiment constitutes a front bumper of a vehicle (automobile) as shown in FIG.
The bumper structure 1 includes a bumper beam 10 extending in the left-right direction (vehicle width direction), and a bumper face 60 (see FIG. 4) disposed outside the bumper beam 10.

  The bumper beam 10 includes an inner member 20 and an outer member 30 arranged in parallel in the vehicle front-rear direction, and the outer member 30 is joined to the front side portion of the inner member 20 (see FIG. 4). Further, the bumper beam 10 includes three buffer members 41 and 42 joined to the front surface of the outer member 30.

As shown in FIG. 2, the inner member 20 is a steel frame extending in the left-right direction. The inner member 20 is formed of a high-tensile steel plate.
The left and right end portions of the inner member 20 are fixed to the front end portions of the left and right front side members 3 and 3 of the vehicle body.

  The inner member 20 includes a wall portion 21 extending in the left-right direction, an upper plate 22 extending forward from the upper edge portion of the wall portion 21, and extending forward from a lower edge portion of the wall portion 21. And a lower plate 23. As shown in FIG. 4A, the inner member 20 has an entire front surface opened.

As shown in FIG. 2, flat mounting portions 24 and 24 are formed at the left and right ends of the inner member 20. Three insertion holes 24 a are formed in the attachment portion 24.
The attachment portion 24 is a portion overlapping the front surface of the flange 3a formed at the front end portion of the front side member 3 (see FIG. 5).

As shown in FIG. 2, the outer member 30 is a steel frame extending in the left-right direction. The outer member 30 is juxtaposed on the front side of the inner member 20.
The outer member 30 is formed of a high-tensile steel plate. The strength (tensile strength) of the outer member 30 is set smaller than the strength (tensile strength) of the inner member 20.

  The outer member 30 includes a wall portion 31 extending in the left-right direction, an upper plate 32 extending rearward from the upper edge portion of the wall portion 31, and extending rearward from the lower edge portion of the wall portion 31. And a lower plate 33 (see FIG. 4A). As shown in FIG. 4A, the outer member 30 is open at the entire rear surface.

As shown in FIG. 3, the outer member 30 protrudes forward from the left and right ends toward the center. The thickness of the outer member 30 in the front-rear direction is larger at the center than at both ends.
The front surface of the outer member 30 is formed in an arch shape that is curved so that the center portion projects forward.

The height of the outer member 30 is formed in the same size as the inner height of the inner member 20 as shown in FIG. The rear end portion of the outer member 30 enters the front end portion of the inner member 20.
The upper surface of the upper plate 32 of the outer member 30 overlaps the lower surface of the upper plate 22 of the inner member 20, and the upper plate 32 of the outer member 30 and the upper plate 22 of the inner member 20 are welded.
The lower surface of the lower plate 33 of the outer member 30 overlaps the upper surface of the lower plate 33 of the inner member 20, and the lower plate 33 of the outer member 30 and the lower plate 23 of the inner member 20 are welded.
In this way, the outer member 30 and the inner member 20 are joined together to form a hollow rectangular tube frame.

As shown in FIG. 2, flat mounting portions 34, 34 are formed at both left and right end portions of the outer member 30. An insertion hole 34 a is formed in the attachment portion 34.
The attachment portion 34 of the outer member 30 is a portion overlapping the front surface of the attachment portion 24 of the inner member 20. The insertion hole 34 a of the attachment portion 34 of the outer member 30 communicates with one of the insertion holes 24 a of the attachment portion 24 of the inner member 20.

  In the flange 3 a formed at the front end of the front side member 3, three insertion holes 3 b communicating with the insertion holes 24 a and 34 a of the outer member 30 and the inner member 20 are formed.

  Bolts B are inserted from the front into the insertion holes 24a, 34a, 3b of the outer member 30, the inner member 20, and the flange 3a. As shown in FIG. 5, the threaded portion of the bolt B is on the rear side of the flange 3a. Are screwed onto the nut N. In this way, the attachment portion 34 of the outer member 30 and the attachment portion 24 of the inner member 20 are fixed to the front end portion of the front side member 3.

As shown in FIG. 1, a first buffer member 41 and left and right second buffer members 42, 42 are provided on the front surface of the outer member 30.
The first buffer member 41 and the second buffer members 42 and 42 are members obtained by bending a steel plate into a C shape in a side view (see FIG. 4), and absorb the collision energy by being deformed during a light vehicle collision. This is an impact absorbing member.

  The first buffer member 41 is disposed between the left and right end portions on the front surface of the outer member 30. As shown in FIG. 3, the first buffer member 41 is curved along the front surface of the outer member 30.

As shown in FIG. 2, the first buffer member 41 includes a front plate 41a extending in the left-right direction, an upper plate 41b extending rearward from the upper edge of the front plate 41a, and a lower portion of the front plate 41a. And a lower plate 41c (see FIG. 4A) extending rearward from the edge.
As shown in FIG. 4A, the upper plate 41b and the lower plate 41c of the first buffer member 41 are inclined downward toward the front.

A joining flange 41d protruding upward is formed at the rear edge of the upper plate 41b, and a joining flange 41e protruding downward is formed at the rear edge of the lower plate 41c.
The upper and lower joining flanges 41 d and 41 e of the first buffer member 41 are overlapped with the front surface of the outer member 30.
The upper and lower joining flanges 41 d and 41 e and the wall portion 31 of the outer member 30 are resistance welded. As a result, the first buffer member 41 is joined to the front surface of the outer member 30.

As shown in FIG. 1, the left and right second buffer members 42, 42 are disposed at the left and right ends on the front surface of the outer member 30. The left and right second buffer members 42, 42 have a symmetrical shape.
As shown in FIG. 4B, the second buffer member 42 includes a front plate 42a, an upper plate 42b, and a lower plate 42c, similar to the first buffer member 41 (see FIG. 4A). Joining flanges 42d and 42e are formed. The upper and lower joining flanges 42 d and 42 e of the second buffer member 42 are resistance welded to the front surface of the outer member 30.

  The upper plate 42b and the lower plate 42c of the second buffer member 42 are inclined upward as they go forward. Thus, as shown in FIG. 1, the first buffer member 41 and the second buffer member 42 have different inclination directions in the vertical direction.

As shown in FIG. 3, the first buffer member 41 and the second buffer member 42 on the left side are arranged with an interval in the left-right direction. Similarly, the first buffer member 41 and the second buffer member 42 on the right side are arranged at an interval in the left-right direction.
As described above, the three buffer members 41 and 42 are arranged in the left-right direction on the front surface of the outer member 30, and a gap T is formed between the adjacent buffer members 41 and 42.

In this embodiment, as shown in FIG. 1, left and right guide members 50, 50 are arranged in front of the outer member 30.
Both guide members 50, 50 are plate-like members for guiding air to the vehicle engine (power source). The air taken into the engine room from the front of the vehicle passes between the guide members 50 and 50 and is sent to the intake portion of the engine.
Both guide members 50, 50 extend in the vertical direction (vehicle height direction) through gaps T, T between the first buffer member 41 and the second buffer members 42, 42 (see FIG. 3).

As shown in FIG. 3, the bumper face 60 is a resin exterior member that covers the bumper beam 10 and both guide members 50, 50.
The bumper face 60 protrudes forward as it goes from the left and right ends to the center.

The front end surfaces (front surfaces) of the first buffer member 41 and the second buffer members 42 and 42 are in contact with the inner surface of the bumper face 60 (see FIG. 4).
As described above, the front end surface of the bumper beam 10 is formed along the inner surface of the bumper face 60. That is, the bumper beam 10 is formed according to the shape of the bumper face 60.

In the bumper structure 1 as described above, since the strength of the outer member 30 is suppressed as shown in FIG. 3, the outer member 30 can be easily molded according to the shape of the bumper face 60.
In the bumper structure 1, since the front end surface of the bumper beam 10 is in contact with the inner surface of the bumper face 60, the collision energy at the time of a vehicle collision can be efficiently transmitted from the bumper face 60 to the bumper beam 10. .

In the bumper structure 1, since the outer member 30 is easily deformed at the time of a vehicle collision, the collision energy can be absorbed efficiently.
In the bumper structure 1, the collision energy can be reliably received by the inner member 20 when the vehicle collides.
Thus, in the bumper structure 1, the bumper beam 10 can be prevented from moving backward while efficiently absorbing the collision energy by the bumper beam 10.

In the bumper structure 1, the central portion of the bumper face 60 protrudes, and the front surface of the outer member 30 is formed in an arch shape according to the shape of the bumper face 60.
If it does in this way, while the outer member 30 becomes easy to deform | transform at the time of a vehicle collision, the outer member 30 becomes large in the front-back direction.
As a result, the central moment of the bumper beam 10 has a large moment of inertia in cross section, and both end portions of the bumper beam 10 are less likely to buckle, so that collision energy can be efficiently absorbed.

  In the bumper structure 1, the inner member 20 and the outer member 30 can be formed with different plate thicknesses and materials. The outer member 30 is formed of a material having good moldability and high toughness, and the inner member 20 is formed of a material having a high tensile strength, whereby the impact absorbing performance of the bumper beam 10 can be enhanced.

  In the bumper structure 1, as shown in FIG. 4A, the upper plate 22 and the lower plate 23 protrude from the upper and lower edges of the inner member 20, so that the strength of the inner member 20 can be increased.

  In the bumper structure 1, the outer member 30 is inserted between the upper plate 22 and the lower plate 23 of the inner member 20, and it is possible to suppress the outer member 30 from being deformed in the vertical direction when the vehicle collides. Thereby, collision energy can be efficiently transmitted from the outer member 30 to the inner member 20.

In the bumper structure 1, as shown in FIG. 1, a first buffer member 41 inclined downward and a second buffer member 42 inclined upward are provided for each part of the bumper face 60 (see FIG. 3). Since it arrange | positions according to a shape, the shock absorption performance of the bumper beam 10 can be improved.
Further, in the bumper structure 1, since the plate thickness of the outer member 30 can be reduced, the buffer members 41 and 42 can be resistance-welded to the outer member 30.

  In the bumper structure 1, both end portions of the bumper beam 10 can be directly connected to the left and right front side members 3 and 3. In this configuration, the rigidity of the connecting portion between the bumper beam 10 and the front side member 3 can be increased, and the connecting portion between the bumper beam 10 and the front side member 3 can be reduced.

  In the bumper structure 1, as shown in FIG. 3, the outer member 30 can be easily formed according to the shape of the bumper face 60, and therefore, after the bumper beam 10 is manufactured, the outer member 30 is processed according to the shape of the bumper face 60. There is no need to do it.

In the bumper structure 1, the inner member 20 and the outer member 30 are joined together with the outer member 30 entering between the upper plate 22 and the lower plate 23 of the inner member 20.
In this configuration, since the joining portion between the inner member 20 and the outer member 30 does not protrude from the upper surface and the lower surface of the bumper beam 10, air flows smoothly around the bumper beam 10.

In the bumper structure 1, as shown in FIG. 1, a guide member 50 for guiding air to the engine extends in the vertical direction through a gap T between adjacent buffer members 41 and 42.
In this configuration, since the degree of freedom of arrangement of the left and right guide members 50, 50 is increased, air can be efficiently fed into the engine.

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention .

In this embodiment, as shown in FIG. 4, the inner member 20 and the outer member 30 are welded, but the joining method of the inner member 20 and the outer member 30 is not limited, and fixing such as bolts You may join by a member.
Moreover, the joining method of the outer member 30 and the buffer members 41 and 42 is not limited, and may be joined by a fixing member such as a bolt.

In the present embodiment, as shown in FIG. 1, three buffer members 41 and 42 are joined to the front surface of the outer member 30, but the number and shape of the buffer members are not limited, and the bumper face 60 It can be set appropriately according to the shape. For example, one buffer member may be joined to the front surface of the outer member 30.
Moreover, in this embodiment, although the steel buffer members 41 and 42 are used, resin buffer members may be used.

  In the present embodiment, as shown in FIG. 3, the tip surfaces of the buffer members 41 and 42 are in contact with the inner surface of the bumper face 60, but the tip surfaces of the buffer members 41 and 42 and the inner surface of the bumper face 60 A gap may be formed between them.

  As shown in FIG. 4A, the bumper structure 1 of the present embodiment is divided into an inner member 20 and an outer member 30 before the inner member 20 and the outer member 30 are joined. Further, a reinforcing member may be provided in the bumper beam 10.

DESCRIPTION OF SYMBOLS 1 Bumper structure 3 Front side member 3a Flange 3b Screw hole 10 Bumper beam 20 Inner member 21 Wall part 22 Upper board 23 Lower board 24 Mounting part 24a Insertion hole 30 Outer member 31 Wall part 32 Upper board 33 Lower board 41 First buffer member 41a front plate 41b upper plate 41c lower plate 42 second buffer member 42a front plate 42b upper plate 42c lower plate 50 guide member 60 bumper face

Claims (3)

A vehicle bumper structure provided with a bumper beam disposed in the front of the vehicle body and extending in the vehicle width direction,
The bumper beam is
An inner member;
An outer member joined to the front side in the vehicle longitudinal direction with respect to the inner member,
The strength of the outer member is set smaller than the strength of the inner member,
A plurality of shock-absorbing members are juxtaposed in the vehicle width direction on the front surface of the outer member,
A guide member for guiding air to the power source of the vehicle is disposed in front of the outer member,
The guide member extends in the vehicle height direction through between the adjacent buffer members ,
In the buffer member,
The first shock-absorbing member inclined downward toward the front of the vehicle;
A bumper structure for a vehicle , comprising: the second shock-absorbing member that is inclined upward toward the front of the vehicle. The vehicle bumper structure according to claim 1,
The bumper structure for a vehicle, wherein the outer member protrudes toward the front of the vehicle as it goes from both ends in the vehicle width direction toward the center. The vehicle bumper structure according to claim 1 or 2 ,
The vehicle inner bumper structure, wherein the inner member is fixed to a flange formed at an end portion of the side member.

Images