JP2005225325A - Rear under run protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear under run protector capable of improving load resistant performance without increasing the thickness of a bracket or a support. <P>SOLUTION: The rear under run protector comprises an RUP body 2 that is arranged in the rear part of a vehicle and is extended in the vehicle width direction, a first bracket 8 that is mounted to the RUP body 2 and has a first pressure receiving section 8a that is molded in a substantially vehicle width direction, a second bracket 9 that is mounted to the RUP body 2 and has a second pressure receiving section 9a that is molded tiltingly by a predetermined angle with respect to the first pressure receiving section 8a in the view from the upside, a first mounted surface section 10a to be mounted to the first pressure receiving section 8a, a second mounted surface section 10b to be mounted to the second pressure receiving section 9a, and a support 10 to be mounted to a vehicle body frame 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rear underrun protector provided at the rear of a vehicle in order to prevent one vehicle from entering under the other vehicle at the time of a collision between vehicles.

  The rear underrun protector is installed in the rear part of heavy-duty vehicles such as trucks. When a collision with a light-duty vehicle such as a passenger car occurs (rear-end collision), these medium-lightweight vehicles can sink under the heavy-duty vehicle. To prevent and avoid major accidents.

  As shown in FIG. 9, the rear underrun protector 1 has a RUP main body 2 provided in the rear part of the vehicle so as to extend in the vehicle width direction. The RUP body 2 is formed in a closed cross-sectional shape as shown in FIG. The RUP main body 2 is attached to the vehicle body frame 6 via the bracket 4 and the support 5, and supports the collision load to prevent the vehicle from getting into the vehicle.

  As shown in FIGS. 11 and 12, the rear underrun protector 1 under development by the present inventor is welded so as to sandwich a bracket 4 having a U-shaped cross section on the RUP body 2, and is attached to the back surface of the bracket 4. A support 5 bent in an L shape as viewed from above is fixed with a bolt nut 6 or the like, and the support 5 is attached to a vehicle body frame 6 shown in FIG.

  In addition, although the prior art document regarding a rear underrun protector was not found in particular, there exists the following patent document 1 as a prior art document regarding a front underrun protector.

Special table 2001-515432 gazette

  By the way, the rear underrun protector 1 needs a predetermined rigidity in order to support the load at the time of collision. Therefore, as shown in FIG. 9, as a form of simulation at the time of a vehicle collision, a test in which a predetermined load (such as 12.5% of the vehicle weight) F is applied inside a predetermined length (325 mm or less) from the outermost side of the vehicle. Done.

  Then, as shown in FIG. 13, the RUP main body 2 bends forward of the vehicle, and a component force f1 inward in the vehicle width direction is generated. Therefore, in the attachment portion 7 between the RUP main body 2 and the bracket 4, in addition to the force f2 forward of the vehicle, the force f1 inward in the vehicle width direction and the rotation (bending moment M) about the attachment portion 7 as a center. Will work.

  Here, if the attachment portion 7 is a rigid body, the RUP main body 2 can be modeled as a cantilever as shown in FIG. However, since the RUP body 2 receives the load F at one mounting portion 7 of the bracket 4 and the support 5, stress concentrates on the mounting portion 7 and the support 5 is bent as shown in FIG. In addition, as shown in FIG. Therefore, the attachment portion 7 cannot be regarded as a rigid body, and the RUP body 2 is modeled as a support beam supported by a rotatable fulcrum as shown in FIG. 14 (a).

  Compared with the cantilever beam type shown in FIG. 14B, the support beam type shown in FIG. 14A rotates the support portion (mounting portion 7) even when the same load F is received. For this reason, the amount of forward movement of the end 2a of the RUP main body 2 increases, and the load bearing performance decreases. Further, when the input point of the load F is displaced forward due to the bending of the RUP main body 2, a vicious cycle occurs in which the component force f1 further increases with the increase of the displacement, and the load resistance performance as the rear underrun protector 1 Will drop significantly. For this reason, the cross-sectional performance which the RUP main body 2 has could not be exhibited efficiently.

  As a countermeasure, it is conceivable to increase the thickness of the bracket 4 and the support 5, but this causes an increase in weight and cost.

  An object of the present invention created in view of the above circumstances is to provide a rear underrun protector capable of improving load bearing performance without increasing the thickness of a bracket or a support.

  In order to achieve the above object, a first invention includes an RUP body disposed at a rear portion of a vehicle and extending in a vehicle width direction, and a first pressure receiving pressure mounted on the RUP body and formed substantially along the vehicle width direction. A first bracket having a surface portion; a second bracket having a second pressure receiving surface portion mounted on the RUP main body and formed at a predetermined angle with respect to the first pressure receiving surface portion as viewed from above; and the first pressure receiving surface portion. And a support that is attached to the vehicle body frame and has a second mounting surface portion that is mounted on the second pressure receiving surface portion.

  Preferably, the second pressure receiving surface portion is inclined by approximately 90 degrees with respect to the first pressure receiving surface portion.

  It is preferable that the support has a reinforcing member that is spanned between the first mounting surface portion and the second mounting surface portion.

  The RUP main body is preferably formed by welding a plurality of hollow rectangular cross-sectional materials stacked one above the other.

  It is preferable that at least one of the first and second brackets is sandwiched between the rectangular cross-section members.

  According to a second aspect of the present invention, there is provided a RUP main body disposed at the rear portion of the vehicle and extending in the vehicle width direction, a bracket having a pressure receiving surface portion mounted on the RUP main body and molded substantially along the vehicle width direction, A rear underrun protector having a mounting surface portion mounted on the pressure receiving surface portion and a support attached to the vehicle body frame, and formed on the support at a substantially right angle when viewed from above with respect to the mounting surface portion. A support surface portion is provided, and a reinforcing member is provided between the support surface portion and the mounting surface portion.

  The third invention includes a RUP main body arranged at the rear of the vehicle and extending in the vehicle width direction, a bracket attached to the RUP main body, and a support attached to the bracket. Is a rear underrun protector that supports a collision load by attaching a plurality of hollow rectangular cross-sectional materials to each other and welding them.

  The fourth invention includes a RUP main body arranged at the rear of the vehicle and extending in the vehicle width direction, a bracket attached to the RUP main body, and a support attached to the bracket. Is a rear underrun protector that attaches to a vehicle body frame to support a collision load. The RUP body is formed by welding a plurality of hollow rectangular cross-sectional materials on top and bottom, and the bracket is made of the rectangular cross-sectional materials. Are attached between the upper and lower surfaces or between the rectangular cross-section members.

  According to the rear underrun protector according to the present invention, the load bearing performance can be improved structurally at a low weight and at a low cost without increasing the thickness of the bracket or the support. it can.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the rear underrun protector 1 according to the present embodiment is a RUP main body that extends in the vehicle width direction at the rear part of the vehicle in the same manner as already described with reference to FIG. 9. 2

  The RUP body 2 is formed in a substantially rectangular closed cross-sectional shape. The RUP main body 2 is attached to the vehicle body frame 6 via the first bracket 8, the second bracket 9, and the support 10, and supports the collision load to prevent the vehicle from entering.

  Specifically, as shown in FIGS. 1 and 2, the RUP main body 2 is formed in a substantially rectangular closed cross-sectional shape, and has an upper surface portion 2 a and a rear surface portion 2 b (positioned on the back surface side when attached to the vehicle). It is a rear part in the sense that it is a front part with respect to the traveling direction of the vehicle, a lower part 2c, and a front part 2d (a front part in the sense that it is located on the front side when attached to the vehicle) And a rear surface portion with respect to the traveling direction.

  The first bracket 8 is formed in a U-shaped cross section and has a central web portion 8a (hereinafter referred to as a first pressure receiving surface portion 8a) and upper and lower flange portions 8b and 8c. The first bracket 8 is attached to the RUP main body 2 from the back surface portion 2b side, and the upper and lower flange portions 8b and 8c are welded to the upper surface portion 2a and the lower surface portion 2c of the RUP main body 2, respectively, and the first pressure receiving surface portion 8a is formed. It is separated from the back surface part 2b. In this state, the first pressure receiving surface portion 8a is disposed substantially parallel to the back surface portion 2b and along the vehicle width direction.

  The second bracket 9 includes a rectangular plate-shaped web portion 9a (hereinafter referred to as a second pressure receiving surface portion 9a) and substantially fan-plate-shaped flange portions 9b and 9c integrally formed at an angle of 90 degrees above and below the web portion 9a. The second bracket 9 is attached to the RUP main body 2 from the back surface portion 2b side, and the upper and lower flange portions 9b and 9c are welded to the upper surface portion 2a and the lower surface portion 2c of the RUP main body 2, respectively, and the second pressure receiving surface portion 9a is formed. The first pressure receiving surface portion 8a is inclined at a predetermined angle (90 degrees in the present embodiment). In this state, the edge of the second pressure receiving surface portion 9a is separated from the back surface portion 2b.

  As shown in FIGS. 1 and 2, the support 10 is formed in an L-shaped cross section when viewed from above, and has a first mounting surface portion 10a mounted on the first pressure receiving surface portion 8a and a second pressure receiving surface portion 9a. Has a second mounting surface portion 10b to be mounted. In the present embodiment, the angle between the first mounting surface portion 10a and the second mounting surface portion 10b is 90 degrees. The first mounting surface portion 10a and the second mounting surface portion 10b are fixed to the first pressure receiving surface portion 8a and the second pressure receiving surface portion 9a via bolts and nuts 11 and the like, respectively.

  The operation of the present embodiment having the above configuration will be described.

  For the rear underrun protector 1, as a form of simulation at the time of a vehicle collision, a predetermined load (12.5% of the vehicle weight) is applied to a predetermined portion of the RUP body 2 (a portion of 325 mm or less from the outermost side of the vehicle). A test for applying F) is performed (see FIG. 9).

  Then, as shown in FIG. 13, the RUP main body 2 bends forward of the vehicle, and a component force f1 inward in the vehicle width direction is generated. Therefore, in the attachment portion 7 (see FIG. 2) between the RUP main body 2 and the first and second brackets 8 and 9, in addition to the force f2 forward of the vehicle, the force f1 inward in the vehicle width direction and the attachment portion 7 And a rotation (bending moment M) about the center (see FIG. 13).

  Here, in the present embodiment, as shown in FIGS. 1 and 2, the mounting portion 7 includes a first pressure receiving surface portion 8a (first mounting surface portion 10a) formed substantially along the vehicle width direction. Since the second pressure receiving surface portion 9a (second mounting surface portion 10b) is formed substantially along the vehicle length direction, the load F is received by being distributed at two positions arranged substantially at right angles to each other. Can do. Therefore, the shared load per location becomes small, and each load support location becomes difficult to deform. That is, it is possible to prevent the support 10 from being bent (see the support 5 in FIG. 15) or the brackets 8 and 9 from being recessed (see the bracket 4 in FIG. 16).

  Since the first pressure receiving surface portion 8a (first mounting surface portion 10a) is formed substantially along the vehicle width direction and the second pressure receiving surface portion 9a (second mounting surface portion 10b) is formed substantially in the vehicle length direction, the RUP The longitudinal force (force f2 forward of the vehicle) generated in the main body 2 is received by the first pressure receiving surface portion 8a (first mounting surface portion 10a), and the lateral force (force f1 inward in the vehicle width direction) is second. The first pressure receiving surface portion 8a (first mounting surface portion 10a) and the second pressure receiving surface portion 9a (the second mounting surface portion 10b) receive the force (bending moment M) that is received by the pressure receiving surface portion 9a (second mounting surface portion 10b). The mounting surface portion 10b) can be efficiently suppressed.

  Thus, in the present embodiment, the load F is distributed and supported at the two locations of the first pressure receiving surface portion 8a and the second pressure receiving surface portion 9a, and the vertical component force f2 and the lateral component force f1 of the load F are supported. Are respectively supported by the first pressure receiving surface portion 8a and the second pressure receiving surface portion 9a, and further, the first pressure receiving surface portion 8a and the second pressure receiving surface portion 9a are arranged at right angles to the rotational force (bending moment M) generated by the load F. Therefore, the rigidity of the mounting portion 7 can be increased without increasing the thickness of the brackets 8 and 9 and the support 10, and the RUP body 2 can be modeled as a cantilever as shown in FIG. 14 (b). Can be

  Therefore, compared with the type described with reference to FIGS. 11 to 13, that is, the type modeled on the support beam supported by the rotatable fulcrum of FIG. 14A, this embodiment has the same load F. Even if it receives, since a support part (attachment part 7) does not rotate, the moving amount to the back of the edge part 2a of the RUP main body 2 becomes small, and load bearing performance improves. Therefore, the cross-sectional performance of the RUP body 2 can be efficiently exhibited as a cantilever beam. Therefore, as described above, it is not necessary to increase the thickness of the brackets 8 and 9 and the support 10, and it is possible to promote weight reduction and cost reduction.

  Moreover, in this embodiment, since each flange part 8b, 8c, 9b, 9c of the 1st bracket 8 and the 2nd bracket 9 is piled up and welded to the upper surface part 2a and the lower surface part 2c of the RUP main body 2. The reaction force between the first bracket 8 and the second bracket 9 against the load F causes the surface portions 2a and 2c to buckle along the plane of the plate thickness of the upper surface portion 2a and the lower surface portion 2c of the RUP body 2. Transmitted in the direction. Therefore, the bending performance of the RUP body 2 is improved.

  That is, if the first bracket 8 and the second bracket 9 are attached to the back surface portion 2b of the RUP main body 2, the support reaction force of the brackets 8 and 9 against the load F is generated in the direction of bending the plate of the back surface portion 2b. Therefore, the RUP main body 2 is likely to be bent (bent) from the mounting portion as a starting point. However, according to the present embodiment, the brackets 8 and 9 are mounted on the surface portions 2a and 2c, so the load F In view of the fact that the supporting reaction force of the brackets 8 and 9 against the plate is generated in the direction of buckling the plates of the upper surface portion 2a and the lower surface portion 2c, the buckling resistance when the plate material is deformed is larger than the bending stress. In this case, the RUP body 2 is difficult to bend (break).

  Another embodiment is shown in FIG.

  As shown in the figure, this embodiment is different from the previous embodiment only in that the first bracket 8 and the second bracket 9 of the previous embodiment shown in FIG. Therefore, the same operations and effects as the previous embodiment are achieved. Note that an integrally molded product of the first bracket 8 and the second bracket 9 is manufactured by press-molding a blank plate punched into a predetermined shape.

  Another embodiment is shown in FIG.

  As shown in the drawing, in this embodiment, the RUP main body 2 is formed by welding a plurality of (two in the illustrated example) two rectangular rectangular cross-section members 2x above and below (line welding, spot welding, etc.) to form a rectangular cross-section member 2x. 1 is different from the embodiment shown in FIG. 1 only in that the plate-like second bracket 9 is sandwiched between 2x. According to this embodiment, since the cross-sectional area of each rectangular cross-section member 2x constituting the RUP main body 2 is reduced, the cross-section coefficient in the load F direction is increased, and the rigidity is improved without increasing the plate thickness.

  Moreover, since each contact surface 2y of each rectangular cross-section material 2x piled up and down becomes a reinforcement material arrange | positioned in parallel with the direction of the load F, rigidity improves. In addition, since the rectangular cross-section members 2x are stacked one above the other, the height dimension of the vertical plane necessary for the RUP main body 2 can be secured while the vertical dimension of the rectangular cross-section members 2x can be reduced. Even if the plate thickness is reduced, the required rigidity can be secured, leading to weight reduction and cost reduction. In addition, since the height dimension of the plate thickness ratio vertical surface can be reduced, wrinkles and waves are less likely to occur on the inner surface of the bend.

  In addition, since the second bracket 9 is welded by being sandwiched and welded between the contact surfaces 2y and 2y of the respective rectangular cross-section members 2x and 2x stacked one above the other, the force applied to the second bracket 9 by the load F is applied to each rectangular cross-section. It is transmitted along the surface by the contact surface 2y of the material 2x. Therefore, the bending resistance performance of the RUP body 2 is improved.

  For the same reason, the first bracket 8 may also be welded by being sandwiched between the contact surfaces 2y and 2y of the rectangular cross-section members 2x and 2x that are stacked one above the other. Further, either one of the first bracket 8 and the second bracket 9 is welded with the contact surface 2y of each rectangular cross-section member 2x being sandwiched, and the other is connected to the upper and lower surfaces 2a of the RUP body 2 made of two rectangular cross-section members 2x. 2c may be welded. Further, the second bracket 9 may be attached to the RUP body 2 in the same U-shaped cross section as the first bracket 8. In any case, the supporting force for the load F can be received along the surface of each rectangular cross-section member 2x.

  Another embodiment is shown in FIG.

  As shown in the figure, this embodiment has a RUP body 2 similar to the RUP body 2 of the embodiment shown in FIG. 1 and a bracket 8 similar to the first bracket 8 of the embodiment shown in FIG. That is, the RUP main body 2 is formed into a substantially rectangular closed cross-sectional shape from the upper surface portion 2a, the back surface portion 2b, the lower surface portion 2c, and the front surface portion 2d, and the bracket 8 has a central web portion (hereinafter referred to as a pressure receiving surface portion). 8a) and the upper and lower flange portions 8b and 8c thereof are formed into a U-shaped cross section.

  Moreover, this embodiment has the support 10 with one end attached to the bracket 8 and the other end attached to the vehicle body frame 6. The support 10 includes a mounting surface portion 10a that is mounted on the pressure receiving surface portion 8a of the bracket 8, and a support surface portion 10c that is formed so as to be inclined at a substantially right angle with respect to the mounting surface portion 10a and mounted on the vehicle body frame 6. Have A reinforcing member 12 (gusset) is provided between the support surface portion 10c and the mounting surface portion 10a. The reinforcing member 12 is not limited to a plate material, and may be a box material.

  According to this configuration, as shown in FIG. 13, a test in which a predetermined load (load of 12.5% of the vehicle weight) F is applied to a predetermined portion of the RUP body 2 (a portion of 325 mm or less from the outermost side of the vehicle). As a result, the reinforcing member 12 receives a rotational force (bending moment M) for bending the support 5 as an in-plane buckling stress, so that the rigidity against the bending moment M is improved. Therefore, the rigidity of the mounting portion 7 can be increased without increasing the thickness of the bracket 8 and the support 10, and the RUP main body 2 can be modeled as a cantilever as shown in FIG. Therefore, there exists an effect | action and effect similar to embodiment shown in FIG.

  Another embodiment is shown in FIG.

  As shown in the figure, in this embodiment, the reinforcing member 12 of the embodiment shown in FIG. 5 is added to the support 10 of the embodiment shown in FIG.

  According to this embodiment, the force applied to the RUP main body 2 by the load F is distributed and supported at two locations of the first bracket 8 and the second bracket 9, and the vertical component force f2 of the load F and the lateral force are applied. The component force f1 is shared and supported by the first bracket 8 and the second bracket 9 respectively, and the rotational force (bending moment M) generated by the load F is further arranged at a right angle between the first bracket 8 and the second bracket 9. In addition, a rotational force (bending moment M) for bending the support 10 can be received as a buckling stress in the plane of the reinforcing member 12.

  For this reason, the rigidity of the attachment portion 7 can be increased without increasing the thickness of the brackets 8 and 9 and the support 10, and the RUP body 2 can be modeled as a cantilever as shown in FIG. 14 (b). Therefore, the operation / effect of the embodiment shown in FIG. 1 and the operation / effect of the embodiment shown in FIG. 5 can be exhibited together.

  Another embodiment is shown in FIG.

  As shown in the drawing, in this embodiment, the first bracket 8 and the second bracket 9 of the previous embodiment shown in FIG. 6 are integrally formed. Therefore, there exists an effect | action and effect similar to previous embodiment shown in FIG.

  Another embodiment is shown in FIG.

  As shown in the figure, in this embodiment, the reinforcing member 12 of the embodiment shown in FIG. 5 is added to the support 10 of the embodiment shown in FIG. The reinforcing member 12 is mounted in two upper and lower stages so as not to interfere with the bolt insertion hole. According to this embodiment, the operation and effect of the embodiment shown in FIG. 4 and the operation and effect of the embodiment shown in FIG. 5 can be exhibited together.

It is a perspective view which shows the principal part of the rear underrun protector which concerns on one Embodiment of this invention. FIG. 2 is a plan sectional view of FIG. 1. It is a principal part perspective view which shows another embodiment. It is a principal part perspective view which shows another embodiment. It is a principal part perspective view which shows another embodiment. It is a principal part perspective view which shows another embodiment. It is a principal part perspective view which shows another embodiment. It is a principal part perspective view which shows another embodiment. It is a whole perspective view of a rear underrun protector. It is sectional drawing (XX sectional drawing of FIG. 9) of a RUP main body. It is a perspective view which shows the principal part of the rear underrun protector which concerns on a prior art example. FIG. 12 is a plan sectional view of FIG. 11. It is a top view which shows the mode of a deformation | transformation when a rear underrun protector receives the load F. FIG. 14A is a schematic diagram when the RUP main body is modeled as a support beam supported by a rotatable fulcrum, and FIG. 14B is a schematic diagram when the RUP main body is modeled as a cantilever beam. It is. FIG. 6 is a plan view showing a state in which a support is bent by a load F. It is a top view which shows the mode of the hollow of the bracket by the load F. FIG.

Explanation of symbols

1 Rear underrun protector
2 RUP body
2a Upper surface portion 2b Back surface portion 2c Lower surface portion 2d Front surface portion 2x Rectangular cross-section material 8 First bracket 8a Web portion (first pressure receiving surface portion)
8b Flange portion 8c Flange portion 9 Second bracket 9a Web portion (second pressure receiving surface portion)
9b Flange portion 9c Flange portion 10 Support 10a First mounting surface portion 10b Second mounting surface portion 10c Support surface portion 12 Reinforcing member

Claims (8)

  A RUP main body disposed at the rear of the vehicle and extending in the vehicle width direction, a first bracket having a first pressure receiving surface portion mounted on the RUP main body and formed substantially along the vehicle width direction, and attached to the RUP main body A second bracket having a second pressure receiving surface portion formed at a predetermined angle with respect to the first pressure receiving surface portion as viewed from above, a first mounting surface portion to be mounted on the first pressure receiving surface portion, and the second pressure receiving pressure. A rear underrun protector comprising: a second attachment surface portion attached to the surface portion; and a support attached to the vehicle body frame.   The rear underrun protector according to claim 1, wherein the second pressure receiving surface portion is inclined by approximately 90 degrees with respect to the first pressure receiving surface portion.   The rear underrun protector according to claim 1, wherein the support includes a reinforcing member that is stretched between the first mounting surface portion and the second mounting surface portion.   The rear underrun protector according to claim 1, wherein the RUP main body is formed by welding a plurality of hollow rectangular cross-sectional materials stacked one above the other. The rear underrun protector according to claim 4, wherein at least one of the first and second brackets is sandwiched between the rectangular cross-section members. An RUP main body disposed at the rear of the vehicle and extending in the vehicle width direction, a bracket having a pressure receiving surface portion mounted on the RUP main body and formed substantially along the vehicle width direction, and a mounting surface portion mounted on the pressure receiving surface portion A rear underrun protector having a support attached to the vehicle body frame, the support provided with a support surface portion formed at a substantially right angle with respect to the mounting surface portion when viewed from above. A rear underrun protector in which a reinforcing member is provided between a surface portion and the mounting surface portion. An RUP body disposed at the rear of the vehicle and extending in the vehicle width direction, a bracket attached to the RUP body, and a support attached to the bracket. A rear underrun protector, wherein the RUP main body is formed by welding a plurality of hollow rectangular cross-sectional materials stacked one above the other. An RUP body disposed at the rear of the vehicle and extending in the vehicle width direction, a bracket attached to the RUP body, and a support attached to the bracket. The RUP main body is formed by welding a plurality of hollow rectangular cross-sectional materials stacked one above the other, and the bracket is connected to the upper and lower surfaces of the rectangular cross-sectional materials or between the rectangular cross-sectional materials. A rear underrun protector that is mounted between the two.

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