JP2009120095A - Underrun protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress increase in weight and to facilitate assembly and parts management. <P>SOLUTION: The underrun protector 1 disposed at a lower position of a vehicle body rear part along the vehicle width direction and mounted on vehicle body frames 7a, 7b via brackets 3a, 3b and each flange member 5 is equipped with a protector body 9 having a closed cross sectional structure opposed and bonded to the flange member 5 in the vehicle body front and rear direction. A protector protrusive streak cross section part 17 having a recessed streak part 17a protruding inward of the cross sectional structure and opposing the flange member 5 is formed on the protector body 9 along the vehicle width direction. A flange protrusive streak cross section part 19 fitted with the recessed streak part 17a is provided on the flange member 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an underrun protector installed at a position below a front part or a rear part of a vehicle body.

  If a passenger car collides with the truck from the front or the rear, the passenger car may sink under the front bumper of the truck or the rear part of the vehicle body. In order to prevent such subsidence, a proposal has been made to provide an underrun protector on the track.

  For example, a front underrun protector described in Patent Document 1 is a component that is disposed at a position below a front bumper and is attached to a vehicle body frame via a bracket, and attempts to sink under the front bumper. Block the car body.

  For this reason, the underrun protector is required to have a strength that can withstand a collision load of a passenger car. In particular, the both ends of the underrun protector projecting from the body frame are cantilevered, so if an impact is applied to the end of the vehicle width, the location of the underrun protector supported by the body frame Is likely to generate a large bending moment, and the rigidity required to withstand this bending moment is required.

  Conventionally, in order to improve the rigidity, measures have been taken to provide a reinforcing member inside the closed cross-sectional shape, and the rigidity has been improved to withstand the bending moment at the mounting location.

  However, the reinforcement member increases the weight of the underrun protector, and in order to prevent the bracket from being damaged due to vibration during traveling due to this increase in weight, it is necessary to ensure the strength of the bracket. The increase may be amplified.

  Further, since the reinforcing member is assembled inside the closed cross-sectional shape, there is a problem that the assembling work is complicated and parts management of the reinforcing member is required.

Japanese Patent No. 3930354

  The problems to be solved are that there is a possibility that the weight increase is amplified by the reinforcing member, the assembling work is complicated, and parts management of the reinforcing member is required.

  In order to suppress an increase in weight and facilitate assembly and parts management, the present invention is arranged along the vehicle width direction at a position below the front or rear of the vehicle body and joined to the bracket and the bracket. An underrun protector that is attached to a vehicle body frame via a flange member that includes a protector body having a closed cross-sectional structure that is face-to-face joined to the flange member in the vehicle longitudinal direction and extends in the vehicle width direction. A protector protruding cross section is formed along the vehicle width direction to form a recessed section that protrudes to the inside of the closed cross-section structure and faces the flange member, and is fitted to the recessed section on the flange member The most important feature is to provide a flange ridge cross section.

  The underrun protector of the present invention is an underrun protector that is disposed along the vehicle width direction at a position below the front or rear of the vehicle body and attached to the vehicle body frame via a bracket and a flange member joined to the bracket. And a protector body having a closed cross-sectional structure that is face-to-face joined to the flange member in the longitudinal direction of the vehicle body and extends along the vehicle width direction, and the protector body protrudes inward from the closed cross-section structure and faces the flange member The ridge cross-section part of the protector for forming the ridge is formed along the vehicle width direction, and the flange ridge cross-section part fitted to the concave ridge part is provided on the flange member.

  For this reason, the intensity | strength of the attachment location of the underrun protector attached to a vehicle body frame can be improved with a protector convex cross section and a flange convex strip cross section.

  Therefore, since the reinforcing member is not attached to the inside of the closed cross-sectional structure, an increase in weight can be suppressed, the number of parts is reduced, and assembly and parts management are facilitated.

  The purpose of suppressing the increase in weight and facilitating the assembly and component management is realized by the protector protruding section and the flange protruding section.

[Structure of underrun protector]
1 is a perspective view of a rear portion of a vehicle, for example, a truck as viewed from the rear side, FIG. 2 is a perspective view of the rear portion of the chassis as viewed from the front side, FIG. 3 is a plan view of the rear portion of the chassis, and FIG. FIG. 5 is a side view of the vehicle body frame to which the underrun protector is attached, and FIG.

  As shown in FIGS. 1 to 4, the underrun protector 1 is arranged along the vehicle width direction at a position below the rear portion of the vehicle body in the present embodiment, and is attached to the brackets 3a and 3b and the brackets 3a and 3b. It is attached to the vehicle body frames 7a and 7b via the member 5, and constitutes a rear underrun protector. The rear underrun protector doubles as a rear bumper.

  The underrun protector 1 includes a protector body 9 having a closed cross-sectional structure that is face-to-face joined to the flange member 5 in the vehicle longitudinal direction and extends along the vehicle width direction. The flange member 5 is joined to the brackets 3a and 3b by welding or the like.

  The protector body 9 has a closed cross-section structure in which a pair of protector panels 11 and 13 made of a press-formed steel plate are opposed to each other in the longitudinal direction of the vehicle body. The protector panel 13 is shorter than the protector panel 11, and the protector main body 9 has both ends 9a and 9b partially open in cross-sectional shape. End pieces 15 a and 15 b are attached to both ends of the protector panel 11.

  As shown in FIG. 2, FIG. 4, and FIG. 5, the protector panels 11 and 13 are composed of vertical walls 11a and 13a and upper and lower horizontal walls 11b, 11c, 13b, and 13c. . The open sides of the protector panels 11 and 13 are opposed to each other in the longitudinal direction of the vehicle body, and the end portions of the upper and lower horizontal walls 11b, 11c, 13b, and 13c are overlapped and joined by welding or the like.

  The protector panel 13, which is one of the pair of protector panels 11 and 13 of the protector body 9, is formed slightly thicker than the protector panel 11, and the vertical wall 13 a has a protector panel at the upper and lower central portions. The strip cross-section portion 17 is formed so as to extend over the entire length in the vehicle width direction along the vehicle width direction.

  The protector ridge cross-section portion 17 protrudes to the inside of the closed cross-section structure of the protector body 9, and forms a ridge portion 17 a facing the flange member 5. The protector ridge section 17 has upper and lower protector ridge inclined surfaces 17c and 17d that incline in a wedge shape toward the flat protruding tip 17b.

  The flange member 5 is formed in a rectangular flat plate shape that is thicker than the protector panel 13, and is provided with a flange convex cross section 19 that fits into the concave portion 17 a at the center in the vertical direction. The flange ridge section 19 is formed over the entire width of the flange member 5 in the vehicle width direction. The flange ridge section 19 has upper and lower flange ridge inclined surfaces 19b and 19c that are inclined in a wedge shape toward the flat protruding tip 19a in the same manner as the protector ridge inclined surfaces 17c and 17d. . The flange ridge inclined surfaces 19b and 19c are opposed to and in contact with the protector ridge inclined surfaces 17c and 17d.

  A vertical wall 13 a of the protector body 9 is fastened and fixed to the flange member 5 by bolts 21. Fastening with the bolt 21 is performed on the weld nut 23 of the vertical wall 13a above and below the protector ridge section 17 and the flange ridge section 19.

  With such a configuration, the underrun protector 1 is provided with a reinforcing portion by the protector convex cross section 17 and the flange convex cross section 19 without providing a reinforcing material in each place where the greatest bending moment acts at the time of collision. It has a provided structure.

At the time of assembly, the protector ridge cross-section portion 17 and the flange ridge cross-section portion 19 have a positioning action, and the fastening work by the bolt 21 can be easily performed.
[Input to underrun protector]
Then, both end portions 9a and 9b in the vehicle width direction where the underrun protector 1 protrudes from the body frames 7a and 7b are cantilevered, and when an impact is applied to the end portions 9a and 9b, A large bending moment is generated in the vicinity of the flange member 5 where the supported underrun protector 1 is attached.

  At this time, the protector body 5 which is the main part of the underrun protector 5 has a closed cross-sectional structure in which protector panels 11 and 13 made of steel plates are combined, and high strength rigidity is provided.

  Moreover, since the rigidity of the protector panel 13 and the flange member 5 is enhanced by the protector ridge cross-section portion 17 and the flange ridge cross-section portion 19, a more effective load-bearing structure against the bending moment can be obtained.

When there is an input such that the protector ridge cross-section 17 is crushed in the gap between the projecting tip portions 17b and 19a, or the protector ridge cross-section 17 and the flange ridge cross-section 19 are crushed, collision energy is generated by plastic deformation. Can be absorbed.
[Effect of Example 1]
The underrun protector 1 according to the first embodiment of the present invention is disposed at a position below the rear portion of the vehicle body along the vehicle width direction and is connected to the brackets 3a and 3b and the flange members 5 joined to the brackets 3a and 3b. An underrun protector 1 attached to 7a and 7b, comprising a protector body 9 having a closed cross-sectional structure that is face-to-face joined to the flange member 5 in the longitudinal direction of the vehicle body and extends in the vehicle width direction. A protector ridge cross-sectional portion 17 is formed along the vehicle width direction to form a concave ridge portion 17a that protrudes inward of the closed cross-sectional structure and faces the flange member 5, and the flange member 5 is provided with the concave ridge portion 17a. The flange convex stripe cross-section part 19 which fits in was provided.

  For this reason, the intensity | strength of the attachment location of the underrun protector 1 attached to the vehicle body frames 7a and 7b can be improved by the protector convex cross section 17 and the flange convex cross section 19.

  Therefore, since no special reinforcing member is attached to the inside of the closed cross-sectional structure, the number of parts is not increased, the weight increase can be suppressed, the number of parts is reduced, and assembly and parts management are facilitated.

  Since the protector ridge section 17 and the flange ridge section 19 protrude into the closed section of the protector body 9, the size of the protector body 9 itself is not increased, and the size can be suppressed.

  The protector body 9 is formed by joining a pair of protector panels 11 and 13 made of steel plate in the front-rear direction of the vehicle body.

  For this reason, the protector body 9 can be easily manufactured by pressing and welding a steel plate.

  The protector ridge cross section 17 has protector ridge inclined surfaces 17c and 17d inclined in a wedge shape toward the projecting tip, and the flange ridge cross section 19 is provided with the protector ridge inclined surfaces 17c and 17d. The flange convex inclined surfaces 19b and 19c are opposed to and in contact with each other.

  For this reason, when a load is transmitted from the protector panel 11 to the protector panel 13 at the time of impact input, the contact force of the protector ridge inclined surfaces 17c and 17d against the flange ridge inclined surfaces 19b and 19c is strengthened, The integrity can be strengthened and the flange member 5 can be effectively used as a reinforcing member of the protector body 9.

  In addition, since there are double reinforcing portions of the protector ridge inclined surfaces 17c and 17d and the flange ridge inclined surfaces 19b and 19c at the attachment location where the largest bending moment acts, the strength and rigidity are improved synergistically. Can do.

  FIG. 6 is a sectional view of the same position as FIG. 5 according to the second embodiment of the present invention. Note that the basic structure of this embodiment is the same as that of the first embodiment, and the same or corresponding components are denoted by the same reference numerals or symbols with the same reference numerals, and redundant description is omitted.

  The protector body 9A of the present embodiment is such that the flat protrusion tip 17bA of the protector convex cross section 17A is arranged on the inner surface of the vertical wall 11a of the protector panel 11 which is the other of the pair of protector panels 11 and 13A. They are abutted in the direction and are integrally connected by spot welding or column welding (or plug welding).

  Therefore, this embodiment can achieve the same effects as those of the first embodiment.

  Further, the rigidity of the protector body 9A can be further increased, and the bending moment can be received more reliably. Further, the protector panels 11 and 13A can be made thinner, and the weight can be further reduced.

  When the input load is slight due to the input to the vertical wall 11a of the protector panel 11 when the input load is slight, the load is transmitted to the protector ridge section 17A, the flange member 5, and the brackets 3a and 3b. The load can be reliably received.

When the input load increases, the protector ridge cross-section portion 17A or the protector ridge cross-section portion 17A and the flange ridge cross-section portion 19 are crushed so that collision energy can be absorbed.
[Others]
The protector main body 9 (9A) is formed in a straight shape between both end portions 9a and 9b, but may be slightly bent toward the vehicle body front side of both end portions 9a and 9b.

  The protector panels 11 and 13 (13A) may have the same length, and the entire protector body 9 (9A) may have a closed cross-sectional structure.

  The vehicle width direction dimensions of the protector panel 13 (13A) and the flange member 5 can be variously changed from the viewpoint of securing the strength and reducing the weight.

  The flange ridge inclined surfaces 19b and 19c and the protector ridge inclined surfaces 17c and 17d are not limited to being in close contact with each other, and can be opposed to each other so that a gap exists between them.

  The protector ridge cross-section portion 17 and the flange ridge cross-section portion 19 can also be formed by being displaced vertically from the vertical center position of the protector panel 13 (13A) and the flange member 5.

  The protector main body 9 (9A) can also be formed by an extruded product of aluminum.

  The underrun protector 1 (1A) can also be configured as a front underrun protector.

  The plate thickness of the flange member 5 and the protector panels 11 and 13 (13A) is such that the flange member 5> the protector panel 13 (13A)> the protector panel 11 can surely absorb energy due to crushing. However, the ratio of the plate thickness can be arbitrarily set.

It is the perspective view which looked at the chassis rear part of the truck from the back side. Example 1 It is the perspective view which looked at the chassis rear part of the truck from the front side. Example 1 It is a top view of the chassis rear part of a track. Example 1 It is a side view of the body frame which attached the underrun protector. Example 1 It is a VV arrow directional cross-sectional view of FIG. Example 1 It is sectional drawing of the same position as FIG. (Example 2)

Explanation of symbols

1, 1A Underrun protector 3a, 3b Bracket 5 Flange member 7a, 7b Body frame 9, 9A Protector body 11, 13, 13A Protector panel 17, 17A Protector convex cross section 17a, 17aA Concave portion 17c, 17cA, 17d, 17dA Protector ridge inclined surface 19 Flange ridge cross section 19b, 19c Flange ridge inclined surface

Claims (5)

An underrun protector attached to a vehicle body frame via a bracket and a flange member joined to the bracket at a position below the front or rear of the vehicle body along the vehicle width direction;
A protector body having a closed cross-sectional structure that is face-to-face joined to the flange member in the vehicle longitudinal direction and extends along the vehicle width direction,
Formed along the vehicle width direction is a protector ridge cross-sectional portion for forming a concave ridge portion that protrudes toward the inside of the closed cross-section structure and faces the flange member on the protector body,
The flange member is provided with a flange convex cross section that fits into the concave portion,
Underrun protector characterized by that. The underrun protector according to claim 1,
The protector body is formed by coupling a pair of protector panels made of steel plate in the front-rear direction of the vehicle body,
Underrun protector characterized by that. The underrun protector according to claim 2,
The protector ridge cross section is formed on one of the pair of protector panels,
The projecting tip of the protector ridge cross-section is abutted against the other of the pair of protector panels in the vehicle longitudinal direction,
Underrun protector characterized by that. The underrun protector according to claim 3,
The protruding tip of the protector ridge cross-section is welded to the other of the pair of protector panels.
Underrun protector characterized by that. The underrun protector according to any one of claims 1 to 4,
The protector ridge cross-sectional portion has a protector ridge inclined surface inclined in a wedge shape toward the protrusion tip portion,
The flange ridge section has a flange ridge inclined surface facing the protector ridge inclined surface,
Underrun protector characterized by that.

Images