JP2004001759A - Reinforcing structure for vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure for a vehicle body enhanced in the stiffness of a joint part of a side sill inner and a cross member. <P>SOLUTION: This reinforcing structure for a vehicle body is provided with a side sill inner 1 which mainly extends in the longitudinal direction of the vehicle body and has at least a side surface part 1b and a bottom surface part 1c, a cross member 2 which has a bottom surface part 2b having at least a tie-down hole 2i thereon and intersects to and is jointed to the side sill inner 1, and a tie-down bracket 3 which reinforces the joint part of the side sill inner 1 and the cross member 2. The tie-down bracket 3 is formed into an approximately L-shaped cross-section shape from the vertical piece part 3a welded to the side surface part 1b of the side sill inner 1 and the horizontal piece part 3b welded to the bottom part 2b of the cross member 2. The horizontal piece part 3b has a tie-down hole 3c thereon. An upward flange is formed on a peripheral edge of the tie-down hole 3c. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a reinforcement structure for a vehicle body, and more particularly, to a joint portion between two members that are joined to cross each other.

Conventionally, when transporting an automobile loaded on a carrier such as a ship, the tie-down hook attached to the carrier is engaged with a tie-down hole drilled in a side member or the like of the vehicle body, so that the carrier and the vehicle body can be connected. Was fixed. Generally, the tie-down holes are reinforced with tie-down brackets so as not to be deformed by the tie-down hooks.
As a mounting structure of such a tie-down bracket, for example, there is a reinforcing structure near a rear portion of a side sill inner that is disposed on both sides of the vehicle body and extends in the front-rear direction of the vehicle body as shown in FIG. ).

Japanese Patent Publication No. 8-9348 (page 2, upper left column, lines 10-15, FIG. 1)

In this structure, a rear side member 13 is interposed between a side sill inner 11 and a cross member 12, a tie-down bracket 14 is joined to the upper side of the rear side member 13, and a rear floor panel 15 is placed to an upper side of the cross member 12 and the rear side member 13. It is to be joined.
In this structure, the vertical piece portion 14a of the tie-down bracket 14 is joined to the side surface portion 13a of the rear side member 13, and the side sill inner 11 and the cross member 12 are formed at the outer end of the cross member 12 in the vehicle width direction. It was joined only by 12b.

However, in such a conventional structure, the tie-down bracket 14 does not contribute to reinforcing the joint between the side sill inner 11 and the cross member 12. The joint between the side sill inner 11 and the cross member 12 is only the flange 12b of the cross member 12. Therefore, as for the structure of the joint between the side sill inner 11 and the cross member 12, a structure having higher rigidity than the conventional structure has been required.

Therefore, an object of the present invention is to provide a vehicle body reinforcement structure in which the rigidity of the joint between the side sill inner and the cross member is increased.

In order to solve the above problem, the present invention has a front-rear direction member extending in the front-rear direction of a vehicle body and having at least a side surface portion and a bottom surface portion, and a bottom surface portion having at least a tie-down hole drilled. A cross member joined to cross the direction member, and a reinforcing member for a vehicle body including a reinforcing member that reinforces a joint between the front-rear direction member and the cross member, wherein the reinforcing member is a member of the front-rear direction member. The vertical piece portion welded to the side face portion and the horizontal piece portion welded to the bottom portion of the cross member have a substantially L-shaped cross section, and the horizontal piece matches the tie-down hole of the bottom portion. The tie-down hole is drilled, and an upward flange is provided on the periphery of the tie-down hole.

According to this, since the longitudinal piece of the reinforcing member having a substantially L-shaped cross section is joined to the side face of the longitudinal member and the transverse piece is joined to the bottom face of the cross member, the longitudinal member and the cross member are joined together. Increases the rigidity of the joint.
Here, the “substantially L-shaped cross section” means that the reinforcing member is bent such that the vertical piece of the reinforcing member abuts the side face of the longitudinal member and the horizontal piece abuts the bottom face of the cross member. Shape.

According to the present invention, since the vertical piece and the horizontal piece of the reinforcing member having a substantially L-shaped cross section are respectively joined to the side face of the longitudinal member and the bottom face of the cross member, the joint between the longitudinal member and the cross member is formed. Increases the rigidity.

[First Embodiment]
The details of the vehicle body reinforcement structure according to the present invention will be described below with reference to the drawings.
In this embodiment, the present invention is applied to a mounting structure of a tie-down bracket near a front portion of a side sill inner that is disposed on both sides of a vehicle body and extends in the front-rear direction of the vehicle body.
As shown in FIG. 1, the mounting portion structure of the tie-down bracket includes a side sill inner (a front-rear direction member) 1 extending in the front-rear direction of the vehicle body M, and a cross member crossed and joined to the side sill inner 1. (Intersection member) 2 and a tie-down bracket (reinforcement member) 3 having a substantially L-shaped cross section. Here, the arrow FR points forward of the vehicle.

サ イ ド As shown in FIG. 2, the side sill inner 1 has a substantially U-shaped cross section at the top surface 1a, the side surface 1b, and the bottom surface 1c. The opening side having the substantially U-shaped cross section is directed outward in the vehicle width direction. A flange 1d extending upward is formed at an outer end (hereinafter, referred to as an outer end) of the upper surface 1a in the vehicle width direction, and a flange 1e extending downward is formed at an outer end of the bottom surface 1c.

The cross member 2 has a substantially U-shaped cross section at the front surface 2a, the bottom surface 2b, and the rear surface 2c. The opening side of this substantially U-shaped section is directed upward. A flange 2d extending forward is formed at an upper end of the front surface 2a, and a flange 2e extending forward is formed at an outer end of the front surface 2a. A rearwardly extending flange 2f is formed at an upper end of the rear surface portion 2c, and a rearwardly extending flange 2g is formed at an outer end of the rear surface portion 2c. An extension surface 2h extending outward in the vehicle width direction is formed at the outer end of the bottom surface 2b at a position lower than the bottom surface 2b by the thickness of the cross member 2, and the outer end of the bottom surface 2b of the cross member 2 is formed. A tie-down hole 2i is drilled near the portion.

The tie-down bracket 3 has a substantially L-shaped cross section by the vertical piece 3a and the horizontal piece 3b. A tie-down hole 3c having substantially the same diameter as the tie-down hole 2i formed in the cross member 2 is formed near the center of the horizontal piece 3b. An upward flange is provided on the periphery of the tie-down hole.

Next, a method of assembling and joining the above components will be described.
As shown in FIG. 3, the upper side of the extension surface 2 h of the cross member 2 is brought into contact with the lower side near the front of the bottom 1 c of the side sill inner 1, and the inner side of the side surface 1 b of the side sill inner 1 in the vehicle width direction. The outer sides in the vehicle width direction of the flanges 2e and 2g of the cross member 2 are brought into contact. At this time, as shown in FIG. 4, the extended surface 2h of the cross member 2 is lower than the bottom surface 2b by the thickness of the cross member 2, so the lower surface of the bottom surface 2b of the cross member 2 and the side sill inner 1 The lower surface of the bottom portion 1c is flush. Then, the contact portion between the side sill inner 1 and the cross member 2 is joined by welding. Next, the outer side in the vehicle width direction of the vertical piece portion 3a of the tie-down bracket 3 is brought into contact with the inner side in the vehicle width direction of the side surface portion 1b of the side sill inner 1, and the upper side of the bottom surface portion 2b of the cross member 2 is used for tie-down. The lower side of the horizontal piece 3b of the bracket 3 is brought into contact. At this time, the positions of the tie-down hole 3c of the tie-down bracket 3 and the tie-down hole 2i of the cross member 2 are also adjusted. Then, the contact portions of the tie-down bracket 3, the side sill inner 1, and the cross member 2 are joined by welding.

According to the above, the vertical piece 3a of the tie-down bracket 3 having a substantially L-shaped cross section is joined to the side face 1b of the side sill inner 1, and the horizontal piece 3b is joined to the bottom face 2b of the cross member 2. The rigidity of the joint between the side sill inner 1 and the cross member 2 can be increased. Further, since the tie-down bracket 3 is used to reinforce the joint between the side sill inner 1 and the cross member 2, there is no need to separately provide a reinforcing member, and the number of components can be reduced. Further, since the bottom 1c of the side sill inner 1 and the bottom 2b of the cross member 2 are flush with each other, the side impact load is efficiently transmitted to the bottom 2b of the cross member 2, and the rigidity in the lateral direction of the vehicle body is increased. can do.

[Second embodiment]
Hereinafter, a second embodiment of the vehicle body reinforcement structure according to the present invention will be described. In this embodiment, the tie-down bracket of the first embodiment is modified. Therefore, the same reference numerals are given to the same components as those of the first embodiment, and the description thereof will be omitted.

As shown in FIG. 5, the tie-down bracket (reinforcing member) 4 has a substantially L-shaped section formed by a vertical piece 4 a and a horizontal piece 4 b. A tie-down hole 4c having substantially the same diameter as the tie-down hole 2i formed in the cross member 2 is formed near the center of the horizontal piece 4b. The length of the horizontal piece 4b in the front-rear direction is substantially the same as the length of the bottom surface 2b of the cross member 2 in the front-rear direction. A flange (vertical wall) 4d extending upward is formed at the front end of the horizontal piece 4b, and a flange 4e extending upward is formed at the rear end. Here, the vertical piece 4a, the horizontal piece 4b, and the flanges 4d and 4e are continuously formed by press working.
The tie-down bracket 4 does not need to be integrally formed by press working. For example, as shown in FIG. 6, the vertical piece portion 4a 'and the flanges (vertical wall portions) 4d' and 4e 'are not continuous with each other. After bending from the outer peripheral end of the horizontal piece 4b ', the vertical piece 4a' and the flanges 4d 'and 4e' may be joined by welding to make them continuous.

Next, a method of attaching the tie-down bracket 4 will be described.
First, the side sill inner 1 and the cross member 2 are assembled and joined in the same manner as in the first embodiment. Then, the vertical piece 4a and the horizontal piece 4b of the tie-down bracket 4 are brought into contact with the side face 1b of the side sill inner 1 and the bottom face 2b of the cross member 2, respectively, as in the first embodiment. At this time, since the horizontal piece 4b of the tie-down bracket 4 and the bottom face 2b of the cross member 2 have substantially the same length in the front-rear direction, the front face 2a of the cross member 2 as shown in FIG. The front side of the flange 4d abuts on the rear side, and the rear side of the flange 4e abuts on the front side of the rear surface 2c of the cross member 2. Then, these contacting portions are joined by welding.

According to the above, by joining the flanges 4d and 4e of the tie-down bracket 4 to the front surface portion 2a and the rear surface portion 2c of the cross member 2, the rigidity of the cross member 2 against the collision load in the front-rear direction can be increased. . In addition, since the continuous vertical piece 4a and the flanges 4d and 4e are joined across the side surface 1b of the side sill inner 1 and the front surface 2a and the rear surface 2c of the cross member 2, the side sill inner 1 and the cross member 2 The rigidity of the joint can be further increased. Furthermore, since the flanges 4d and 4e of the tie-down bracket 4 reinforce the vertical piece 4a and the horizontal piece 4b, the rigidity of the tie-down bracket 4 itself can be increased.

As described above, the present invention is not limited to the above embodiment, but may be embodied in various forms.
For example, in the present embodiment, the present invention is applied to the case where the side sill inner and the cross member are directly joined. However, as in the conventional case, when the rear side member is interposed between the side sill inner and the cross member and joined. May be applied. In this case, the horizontal piece of the tie-down bracket is attached to the bottom surface of the cross member via the rear side member.

Also, in the present embodiment, the front-back direction member is the side sill inner and the cross member is the cross member, but the present invention is not limited to this. For example, the front-rear direction member may be a side sill outer, a front side member or a rear side member, or the cross member may be a front side member having a rear portion bent outward in the vehicle width direction, and a front portion bent outward in the vehicle width direction. Or a rear side member or a floor panel.

Furthermore, the present invention is also applicable to a case where the cross member having a substantially U-shaped cross section is joined to the side sill inner with the opening side facing downward. Even in such a case, the vertical piece of the reinforcing member is joined to the side face of the side sill inner, and the horizontal piece is joined to the bottom of the cross member, thereby reinforcing the joint between the side sill inner and the cross member. Can be.

FIG. 1 is a schematic perspective view of a vehicle body showing a first embodiment of the present invention. FIG. 2 is an exploded perspective view of a portion surrounded by a broken line indicated by an arrow a in FIG. 1. FIG. 3 is a perspective view showing a state where the components of FIG. 2 are assembled and joined. FIG. 4 is a sectional view taken along the line AA of FIG. 3. It is an exploded perspective view showing a 2nd embodiment of the present invention. It is a perspective view which shows the modification of the bracket for tie-down shown in FIG. FIG. 6 is a perspective view showing a state where the components of FIG. 5 are assembled and joined. It is sectional drawing which shows the mounting part structure of the conventional tie-down bracket.

Explanation of reference numerals

1 side sill inner (fore and aft members)
1b Side surface 1c Bottom 2 Cross member (cross member)
2b Bottom part 2i Tie-down holes 3, 4 Tie-down bracket (reinforcing member)
3a, 4a Vertical pieces 3b, 4b Horizontal pieces 3c, 4c Tie-down holes

Claims (1)

A longitudinal member extending in the longitudinal direction of the vehicle body and having at least a side surface and a bottom surface;
An intersecting member having at least a tie-down hole perforated and having a bottom surface portion intersecting and joined to the longitudinal member,
A vehicle body reinforcement structure including a reinforcement member that reinforces a joint between the front-rear direction member and the cross member,
The reinforcing member,
A vertical piece welded to a side face of the front-rear direction member,
The cross piece is welded to the bottom of the cross member, and has a substantially L-shaped cross section,
A tie-down hole corresponding to the tie-down hole in the bottom surface portion is drilled in the lateral piece portion, and an upward flange is provided around a periphery of the tie-down hole.

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