JP2010137678A - Front bumper structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a front bumper structure with a favorable design property (appearance) maintaining aerodynamic performance without being limited by the arrangement of a front underrun protector. <P>SOLUTION: In the front bumper structure, the front underrun protector 34 is arranged at a rear side of a front bumper 10 of a vehicle to cover a vehicle front at a lower side of the front bumper 10. In the front bumper structure, the front underrun protector 34 is arranged at the rear side of the front bumper 10 at the center 10A of the front bumper 10, and a camber is formed by inclining a lower side 46 upward at right and left end vicinities 10B of the front bumper and bending an end side 13 continuous to the inclined portion from an upper position of the front underrun protector 34 to a vehicle rear side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a front bumper mounted on a vehicle, and particularly to a front bumper structure provided with a front underrun protector in a large vehicle such as a truck.

  When a large vehicle such as a truck collides with a small vehicle such as a passenger car, the front bumper of the large vehicle is disposed at a high position, so that the small vehicle may slip into the lower side of the large vehicle. For example, when a passenger car collides with a truck, there is a risk that the passenger car may go under the front bumper of the truck and destroy the passenger compartment beyond the window glass.

  Conventionally, in order to prevent this, it has been proposed that a front underrun protector is provided behind the front bumper so as to cover the front part of the vehicle below the front bumper, and the front underrun protector prevents the passenger car from getting caught.

  For example, Patent Document 1 (Japanese Utility Model Publication No. 7-4209) discloses a mounting structure for a front under-run protector that reduces the number of parts and facilitates the mounting when the front under-run protector is attached to a vehicle body. . In this mounting structure, the front under-run protector is mounted on the front spring bracket that supports the spring of the spring suspension, so that another mounting member is not required, the number of parts is reduced, and mounting is facilitated.

The mounting position of the front underrun protector in the vertical direction with respect to the body frame differs depending on the vehicle type due to the difference in the ground clearance of the vehicle, and conventionally, it is possible to change the mounting position of the front underrun protector in the vertical direction. It was not easy.
Patent Document 2 (Japanese Patent Laid-Open No. 9-263196) discloses a configuration that adopts an easy structure for changing the vertical mounting position of the front underrun protector and improves the appearance of the front bumper portion. Has been.

  In Patent Document 2, through holes for fastening bolts are formed in a plurality of positions corresponding to a plurality of fixing positions in a bracket for fixing a front underrun protector, or fastening bolts are provided in a length range corresponding to a plurality of fixing positions. By forming a long hole that is inserted and slid, adjustment of the mounting position is facilitated, parts are shared, and the front underrun protector is fixed to the back side of the air dam. The appearance is improved by shielding the protector from the outside.

Japanese Utility Model Publication No. 7-4209 JP-A-9-263196

  The front underrun protector needs to be arranged below a certain height from the ground due to legal regulations, and needs to extend to the vicinity of both the left and right side surfaces of the vehicle. Moreover, since a certain amount of strength is required, it is configured by a square cross-section wall having a closed section. Therefore, it is normally located between the front bumper and the front part of the vehicle and horizontally in the lower side of the front bumper.

Therefore, the shape of the front bumper and the front underrun protector is limited by the mutual arrangement relationship. In consideration of aerodynamic performance and appearance, the front bumper has a camber that bends smoothly back and forth along the side of the vehicle in the vicinity of the left and right ends.
However, when the front underrun protector is extended to the vicinity of the outermost side of the vehicle, the shape of the front bumper is restricted, and in order to avoid interference with the front underrun protector, the front bumper is exposed to the outside of the vehicle side. It becomes necessary to increase the amount of protrusion or to increase the amount of protrusion to the front of the vehicle.

  In addition, the presence of the front underrun protector eliminates the degree of freedom in forming the camber and makes it impossible to achieve an optimum shape in terms of aerodynamic performance. Moreover, it must be inferior in design.

  In view of the problems of the prior art, the present invention provides a front bumper structure of a vehicle provided with a front underrun protector, which is not limited by the arrangement of the front underrun protector, maintains aerodynamic performance, and has a design (appearance). The purpose is to realize a good front bumper structure.

In order to solve the above problems, a front bumper structure for a vehicle according to the present invention includes:
In the vehicle front bumper structure in which the front underrun protector is disposed so as to cover the front of the vehicle body below the front bumper.
The front underrun protector is arranged behind the front bumper at the center part of the front bumper,
The lower part of the front bumper is inclined upward at the part near the left and right ends of the front bumper, and the end part connected to the inclined side is bent from the upper position of the front underrun protector to the rear of the vehicle to form a camber. is there.

In the present invention, the front under-run protector is disposed behind the front bumper at the center portion of the front bumper, thereby eliminating interference in the arrangement of the two. Is tilted upward so that the positions of the two in the vertical direction are different, thereby avoiding interference in the arrangement of the two.
Accordingly, since the camber can be formed at the end portion of the front bumper without interfering with the front underrun protector, the amount of the front bumper protruding to the outside of the vehicle side or the front of the vehicle can be suppressed. In addition, since the degree of freedom of the front bumper structure can be secured, the aerodynamic performance and design of the front bumper can be maintained.

In the present invention, the front bumper is fixed to the chassis frame via the first bracket, and the front underrun protector is fixed to the chassis frame via the second bracket, and the first bracket and the first bracket are fixed to the chassis frame. The two brackets may be superposed on the fixed surface of the chassis frame and fastened together with the same fastening bolt.
As a result, the number of parts for mounting the front underrun protector can be reduced.

In the present invention, a fog lamp mounting hole may be provided in an upper part of the inclined side of the front bumper, and the fog lamp may be mounted in the fog lamp mounting hole.
By providing a fog lamp in the upper part, the fog lamp can be arranged above the front under-run protector and can be arranged without interfering with the front under-run protector.
Therefore, since the fog lamp can be mounted without being restricted by the front under-run protector, the degree of freedom of the fog lamp mounting position can be expanded and the fog lamp can be easily mounted.

Further, in the present invention, a step portion is provided at the boundary between the central portion of the front bumper and the vicinity of the left and right ends, and a cover that covers the portion near the left and right ends from the step portion is provided, and the outer peripheral surface of the central portion of the front bumper An outer peripheral surface having a continuous curved surface with the outer peripheral surface of the cover may be formed. By providing this cover, the design of the front bumper can be improved, and the portions near the left and right ends of the front bumper and the front underrun protector can be covered from the outside, so that the appearance of this portion can be improved.
In the structure in which the fog lamp is provided in the upper inclined portion of the front bumper, an opening is provided in the cover corresponding to the position of the fog lamp.

Further, when the cover and the front bumper are manufactured integrally, deep processing is required, and press processing becomes difficult. On the other hand, by manufacturing these separately, deep processing becomes unnecessary and press processing becomes easy. Further, when the cover part needs to be replaced, only the cover needs to be replaced, so that the replacement work is facilitated and the cost can be reduced.
If the cover is made of resin, the weight of the entire front bumper can be reduced and the design can be improved.

  According to the front bumper structure of the present invention, in the vehicle front bumper structure in which the front underrun protector is disposed so as to cover the front part of the vehicle body below the front bumper, the front underrun protector is provided at the center portion of the front bumper. Is placed behind the front bumper, and the lower side of the front bumper is inclined upward near the left and right ends of the front bumper, and the end side portion connected to the inclined side is bent from the upper position of the front underrun protector to the rear of the vehicle. By forming the camber, the amount of the front bumper protruding to the outside of the vehicle side or to the front of the vehicle can be suppressed, and it is easy to form a camber that bends to the rear of the vehicle near the left and right ends of the front bumper. Therefore, the degree of freedom of the front bumper structure in the vicinity of the left and right ends can be secured. It can maintain the aerodynamic performance and design of Rontobanpa.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified.

  An embodiment of the present invention will be described with reference to FIGS. 1 to 4 show a front bumper structure mounted on a large vehicle such as a truck. 1 to 4 all show the left half of the front bumper. Hereinafter, the configuration of the left half will be described and the description of the configuration of the right half will be omitted, but the right half also has the same configuration. 1 shows a state before the cover 24 is attached, and FIG. 2 shows a state after the cover 24 is attached.

  1 to 4, the front bumper 10 of the present embodiment includes a central portion 10A and left end vicinity portions 10B integrally formed with the central portion 10A on both sides of the central portion 10A. A cooling air flow is supplied to an ECU (Engine Control Unit) provided inside the vehicle body during traveling, or a tow hook 16 fixed to a chassis frame 14 described later is externally attached to the central portion 10A. And an opening 22 for attaching the fog lamp 20 to the portion 10B near the left and right ends.

  The central portion 10A has an upper flange portion 11a and a lower flange portion 11b that are inclined in the longitudinal direction of the vehicle at the upper and lower ends, and a similar upper flange portion 12a and lower flange portion 12b are also provided in the portion near the left end 10B. A step portion 26 for mounting the cover 24 is formed at the boundary between the central portion 10A and the left end vicinity portion 10B.

  In FIG. 3, the cover 24 is made of resin, and an upper flange portion 24 a and a lower flange portion 24 b inclined in the vehicle front-rear direction are formed at the upper and lower ends of the cover 24, and the end side portion 25 of the cover 24 is A camber that bends backward is formed. The outer peripheral surface of the cover 24 is configured such that a smooth curved outer peripheral surface can be formed by the central portion 10A and the outer peripheral surface of the cover 24 when the cover 24 is attached to the left end vicinity portion 10B.

  As shown in FIG. 4, a pair of chassis frames 14 are provided in the vehicle front-rear direction symmetrically with respect to the center line in the vehicle body front-rear direction. As shown in FIG. 2, the chassis frame 14 has a U-shaped cross section including an upper flange portion 14a, a lower flange portion 14b, and a central portion 14c. A three-dimensional bracket 28 having a triangular upper and lower surface in plan view is fixed to the front end of the chassis frame 14 with four bolts and nuts 30. Of the four bolts and nuts 30, the traction hook 16 is fastened to the chassis frame 14 with lower bolts and nuts 30 a and 30 b.

  A fixing bracket 31 having a U-shaped upper cross section is integrally fixed to the back surface of the central portion 10 </ b> A. The fixing bracket 31 and the bracket 28 are coupled by two bolts and nuts 32. As a result, the front bumper 10 is integrally coupled to the chassis frame 14.

A front underrun protector 34 is disposed below the front bumper 10 between the front bumper 10 and the vehicle body. The front under-run protector 34 prevents the small vehicle from getting caught under the front bumper when it collides with a small vehicle such as a passenger car. The front underrun protector 34 has a cross section having a rectangular wall surface with a closed space inside, and is disposed horizontally along the front bumper body 10 in the vehicle width direction.
The front underrun protector 34 is coupled to the bracket 36 by four bolts and nuts 38, and the bracket 36 is coupled to the chassis frame 12 by the chassis frame 14 and three bolts and nuts 30 a, 30 b and 44.

  The bracket 36 has a vertical mounting portion 40 disposed in the vertical direction on the upper portion and a horizontal mounting portion 42 disposed in the horizontal direction. The vertical mounting portion 40 is fastened to the central portion 14c of the chassis frame 14 together with the bracket 28 and the traction hook 16 by bolts and nuts 30a and 30b. Further, the horizontal mounting portion 42 is coupled to the lower flange portion 14 b of the chassis frame 14 with bolts and nuts 44.

  The lower side 46 of the portion 10B near the left end forms an inclination that rises toward the side surface of the vehicle body. Further, the end side portion 13 of the left end vicinity portion 10B has a shape that bends slightly toward the rear of the vehicle so that a cover 24 having an end side portion 25 having a camber facing toward the rear of the vehicle can be mounted. The cover 24 has an opening 48 formed at a position facing the fog lamp 20 when the cover 24 is attached to the portion 10B near the left end. Moreover, the cover 24 has a smooth outer peripheral surface that bends toward the rear of the vehicle as it faces outward from the side of the vehicle.

  As shown in FIG. 3, the cover 24 is formed by inserting bolts 52 into the mounting holes 50 drilled at the four corners of the left end portion 10B and the mounting holes 51 drilled in the cover 24, thereby removing the left end portion 10B. It is attached to cover. When the cover 24 is attached to the portion 10B near the left end, the front bumper 10 forms a smooth outer peripheral surface with the outer peripheral surface of the central portion 10A and the outer peripheral surface of the cover 24, and at the end side portion 25 of the cover 24, A camber inclined toward the rear of the vehicle is formed.

  According to the present embodiment having such a configuration, in the central portion 10A of the front bumper 10, the front under-run protector 34 is disposed behind the central portion 10A, thereby eliminating interference on the arrangement of the two. Further, in the portion 10B near the left end of the front bumper, the vertical side positions of the portion 10B near the left end and the front underrun protector 34 are made different by inclining the lower side 46 upward in the vehicle width direction. Therefore, mutual interference can be avoided. Therefore, the left end vicinity portion 10B and the front under-run protector 34 can be arranged at substantially the same position in the vehicle front-rear direction, and the amount of the front bumper 10 protruding outward from the vehicle side or the vehicle front can be suppressed.

In addition, since there is no interference in arrangement between the left end vicinity portion 10B and the front underrun protector 34, a camber that bends to the rear of the vehicle through the upper portion of the front underrun protector 34 at the end side portion 25 of the left end vicinity portion 10B. It becomes possible to form.
Therefore, since the degree of freedom of the front bumper structure can be secured, the aerodynamic performance and design of the front bumper can be maintained.

  Further, the front bumper 10 is fixed to the chassis frame 14 via the bracket 28, and the front underrun protector 34 is fixed to the chassis frame 14 via the bracket 36, and the bracket is attached to the central portion 14 c of the chassis frame 14. Since 28 and the bracket 36 are overlapped and fastened together with the same fastening bolts 30a and 30b, an extra part for attaching the front underrun protector 34 becomes unnecessary, and the number of parts can be reduced.

  Further, the mounting opening 22 is provided above the lower side 46 of the portion 10B near the left end, and the fog lamp 20 is provided in the mounting opening 22 so that the fog lamp 20 interferes with the front underlamp protector 34 as shown in FIG. Can be installed without Therefore, the freedom degree of the attachment position of the fog lamp 20 can be expanded, and attachment of the fog lamp 20 becomes easy.

  Further, a step portion 26 is provided at the boundary between the front bumper 10 and the left end vicinity portion 10B12 so that the left end vicinity portion 10B is shifted rearward with respect to the front bumper 10, and the step portion 26 covers the left end vicinity portion 10B from the outside. By providing 24, it is possible to form the outer peripheral surface having a smooth curved surface with the outer peripheral surface of the front bumper 10 and the outer peripheral surface of the cover 24 while covering the left end vicinity portion 10B and the front underrun protector 34 from the outside. The design (look) of the front bumper can be improved.

In addition, since the front bumper 10 and the cover 24 are manufactured separately, it is not necessary to perform deep processing as in the case of manufacturing the cover and the front bumper integrally, so that press processing is facilitated. Further, when the replacement is necessary, only the cover needs to be replaced, so that the replacement work becomes easy and the cost can be reduced.
Further, since the cover 24 is made of resin, the weight of the entire front bumper can be reduced and the design can be improved.

  According to the present invention, in the front bumper structure of a vehicle equipped with a front underrun protector, the amount of front bumper protruding to the front of the vehicle can be suppressed and the degree of freedom of the bumper structure can be increased. A highly efficient front bumper structure can be realized.

1 is a perspective view showing a front bumper structure of a vehicle according to an embodiment of the present invention. It is the perspective view which looked at the said embodiment from the direction different from FIG. It is a perspective view which shows the attachment aspect of the cover 24 in the said embodiment. It is sectional drawing which follows the AA line in FIG.

Explanation of symbols

10 Front bumper structure 10A Central part 10B Left and right end vicinity part 14 Chassis frame 20 Fog lamp 22 Opening (fog lamp mounting hole)
24 Cover 25 Cover end side portion 26 Stepped portion 28 Bracket (first bracket)
30a, 30b Bolt / Nut (fastening bolt)
34 Front underrun protector 36 Bracket (second bracket)
46 Lower slope

Claims (4)

In the vehicle front bumper structure in which the front underrun protector is disposed so as to cover the front of the vehicle body below the front bumper.
The front underrun protector is arranged behind the front bumper at the center part of the front bumper,
Inclining the lower side of the front bumper upward at the part near the left and right ends of the front bumper, and bending the end part connected to the inclined side from the upper position of the front underrun protector to the rear of the vehicle to form a camber. Characteristic front bumper structure of the vehicle. The front bumper is fixed to the chassis frame via a first bracket, and the front underrun protector is fixed to the chassis frame via a second bracket,
2. The front of a vehicle according to claim 1, wherein the first bracket and the second bracket are overlapped with a fixed surface of the chassis frame and are fastened together with the same fastening bolt. Bumper structure.   The vehicle front bumper structure according to claim 1, wherein a fog lamp mounting hole is provided in an upper portion of the inclined side of the front bumper, and the fog lamp is mounted in the fog lamp mounting hole. A step is provided at the boundary between the central part of the front bumper and the part near the left and right ends, and a cover that covers the part near the left and right ends from the step part is provided.
2. The vehicle front bumper structure according to claim 1, wherein an outer peripheral surface having a continuous curved surface is formed by an outer peripheral surface of a central portion of the front bumper and an outer peripheral surface of the cover.

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