JP2001030951A - Connection structure of lower part of back door pillar of wagon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of a lower part of a back door pillar of a wagon. SOLUTION: A back door pillar 4 is welded to a lower back 1 of hollow structure comprising a lower back outer panel 2 welded to a lower back inner panel 3, a rear floor panel 5 is welded to the lower back outer panel 2 of the lower back, a lower edge part of a rear floor side member 6 of U-shaped section is welded to a rear floor panel 5, an end part of the rear floor side member 6 is welded to the lower back outer panel 2, and in addition, a gusset 7 is set up between the lower back inner panel 3 and a side part of the end part of the rear floor side member 6, and connected thereto to constitute the connection structure of a lower part of the back door pillar.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure around a back door opening of a wagon vehicle, and more particularly to a connection structure between a door pillar of a back door and a lower back.

[0002]

2. Description of the Related Art The structure of a conventional wagon car connected to a lower bag at the lower part of a back door pillar is shown in FIG. 3 which is a perspective view of a main part thereof and FIG. 4 which is a schematic sectional view taken along line IV-IV in FIG.
It was configured as shown. That is, the lower back 1 located at the lower end of the rearmost portion of the body of the wagon car abuts the press-formed lower back outer panel 2 and the lower back inner panel 3 and determines the predetermined locations a and b along the overlapped edge. Is spot-welded to form a hollow structure. The lower end of the hollow back door pillar 4 is spot-welded to the rear end of the lower back 1, and the edge of the rear floor panel 5 is spot-welded to the inner surface of the lower back outer panel 2 at a predetermined location c. The end of the rear floor side member 6 press-molded in a U-shaped cross section is the lower back outer panel 2.
And the lower edges of the rear floor side members 6 are joined to the rear floor panel 5 by spot welding at predetermined positions d.
And the lower back 1, the back door pillar 4, and the rear floor side member 6 functioned as a framework around the back door opening.

[0003]

In such a joint structure at the lower part of the back door pillar, the ends of the rear floor side members 6 are welded only to the lower back outer panel, so that the skeletons are not connected. Therefore, it was necessary to further improve the torsional rigidity of the body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coupling structure of a lower part of a back door pillar of a wagon vehicle in which the body rigidity of the wagon vehicle is increased by further improving the torsional rigidity of the body.

[0005]

In order to achieve the above object, one embodiment of a connecting structure of a lower part of a back door pillar of a wagon vehicle according to the present invention is to form a hollow structure by welding a lower back outer panel and a lower back inner panel. A lower door pillar is welded to the lower back, and a lower floor outer panel of the lower back is welded to a rear floor panel, and a lower edge of the rear floor side member having a U-shaped cross section is welded to the rear floor panel. A gusset is bridged and connected between the lower back inner panel and the end portion of the rear floor side member in a connection structure at a lower portion of a back door pillar of a wagon having an end portion welded to the lower back outer panel. It consists of. In the above configuration, the connection of the gusset between the lower back inner panel and the end portion of the rear floor side member is
Preferably, it is done by bolting.

According to the above construction, the end of the rear floor side member, which has conventionally been connected only to the lower back outer panel side, is also connected to the lower back inner panel side via a gusset, so that a skeleton-to-frame connection is formed. As a result, the torsional rigidity of the body is further improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. Note that components that perform the same or equivalent functions as those of the above-described conventional example will be described with the same reference numerals. FIG. 1 is a perspective view of a main part of a connection structure of a lower portion of a back door pillar of a wagon vehicle according to the present invention, and FIG.
FIG. 2 is a schematic sectional view taken along line II-II in FIG. 1.

A lower bag 1, which is located at the lower end of the rearmost portion of the body of the wagon car, abuts a press-formed lower back outer panel 2 and a lower back inner panel 3 as in the prior art, and forms an overlapped edge between them. Along the predetermined locations a and b, spot welding is performed to form a hollow structure. The lower end of the hollow back door pillar 4 is spot-welded to the rear end of the lower back 1, and the edge of the rear floor panel 5 is spot-welded to the inner surface of the lower back outer panel 2 at a predetermined location c. The end of the rear floor side member 6 press-formed in a U-shaped cross section is welded to the inner surface of the lower back outer panel 2, and the lower edge of the rear floor side member 6 is spotted on the rear floor panel 5 at a predetermined position d. They are joined by welding.

The above structure is the same as that of the conventional back door pillar lower joint structure.
Further, a gusset 7 is bridged between the lower back inner panel 3 and an end portion of the rear floor side member 6. The gusset 7 has both ends extending in a flange shape, and the flange-shaped portions are connected to the end portions of the lower back inner panel 3 and the rear floor side member 6 by bolts 8, respectively. The bolt 8 is fixed to a weld nut 9 previously welded to the lower back inner panel 3 and an end portion of the rear floor side member 6.

According to the above-described embodiment, the end of the rear floor side member 6 which has conventionally been connected only to the lower back outer panel 2 side of the lower back 1 is also connected to the lower back inner panel 3 side via the gusset 7. Therefore, a connection between the skeletons is formed, and as a result, the torsional rigidity of the body is further improved. In fact, according to CAE analysis,
The torsional rigidity of the body has been improved by several percent compared to the past.

The connection between the lower back inner panel 3 at both ends of the gusset 7 and the end portion of the rear floor side member 6 may be performed with an iron plate tack or by spot welding. If the bolt 8 and the weld nut 9 are connected as described above, the fixing strength is excellent.

[0012]

As can be understood from the above description, according to the joint structure of the lower part of the back door pillar of the wagon vehicle according to the present invention, the lower back and the rear floor side member are joined via the gusset. A connection structure around the back door opening of the wagon vehicle in which the connection between the skeletons is formed and the torsional rigidity of the body is further improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of an embodiment of a coupling structure of a lower portion of a back door pillar of a wagon vehicle according to the present invention.

FIG. 2 is a schematic sectional view taken along line II-II in FIG.

FIG. 3 is a perspective view of a main part of a coupling structure of a lower portion of a back door pillar of a conventional wagon vehicle.

FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower back 2 Lower back outer panel 3 Lower back inner panel 4 Back door pillar 5 Rear floor panel 6 Rear floor side member 7 Gusset 8 Bolt 9 Weld nut

Claims (2)

[Claims] 1. A back door pillar is welded to a lower back having a hollow structure by welding a lower back outer panel and a lower back inner panel, and a rear floor panel is welded to a lower back outer panel of the lower back. A lower edge of the rear floor side member of the wagon car, wherein a lower edge of the U-shaped rear floor side member is welded to the rear floor panel, and an end of the rear floor side member is welded to the lower back outer panel; A connecting structure under a back door pillar of a wagon, wherein a gusset is bridged and connected between the inner panel and an end portion of the rear floor side member. 2. The structure according to claim 1, wherein the connection is made by bolting.