JPH11124053A - Rear vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a back door opening by enhancing the rigidity of an upper corner portion of the back door opening. SOLUTION: In this vehicle body structure, a T-shaped trifurcated part T is formed by a roof side rail 4 of a closed section coupled with the side rim of a roof panel 2 of a vehicle through a longitudinally formed roof drip 3 having a recessed section, a rear pillar 5 of a closed section forming a side rim of a back door opening 1, and a back door opening upper rail 6 of a closed section forming an upper rim of the back door opening 1 along the rear edge of the roof panel 2. A back door opening frame 8b forming a opening edge flange of the back door opening 1 is provided along a corner of the inner peripheral rim of the trifurcated part T. The outer periphery of the opening frame 8b is extended toward inside the trifurcated part T, and an extended portion 82 divides the closed section of the trifurcated part T by passing the closed section. Further, a reinforcement wall is formed to be coupled with the rear end of the roof drip 3. Accordingly, the trifurcated part T has a double closed-section structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear body structure, and more particularly to a structure of an upper corner portion of a back door opening of a vehicle body.

[0002]

2. Description of the Related Art As shown in FIG. 7, in a van type vehicle or the like, upper left and right corners of a back door opening 1 of a vehicle body are joined along left and right side edges of a roof panel 2,
A roof side rail 4 having a closed cross section that forms a roof drip portion 3 having a concave cross section in the connecting portion in the vehicle front-rear direction, and a rear pillar 5 having a closed cross section that extends the roof side rail 4 and forms an opening side edge of the back door opening 1. And a back door opening upper rail (hereinafter referred to as an opening) having a closed section in which an upper edge of the back door opening 1 is formed along a rear edge of the roof panel 2 and a terminal is connected to a boundary between the roof side rail 4 and the rear pillar 5. (Referred to as rails) 6 together form a T-shaped trifurcation T. A back door opening frame (hereinafter, referred to as an opening frame) 7 forming an opening edge flange for receiving an outer peripheral edge of the back door (not shown) is provided in series on the inner peripheral side of the opening rail 6 and the rear pillar 5.

[0003] The opening frame 7 includes an opening upper frame 7a integrally formed along the rear edge of the opening rail 6 and an opening corner frame substantially L-shaped and provided along the inner peripheral corner of the trifurcation T. 7b (FIG. 8) and an opening side frame 7c provided along the inner edge of the rear pillar 5 are connected in series to protrude inside the back door opening 1. The opening corner frame 7b has a vertical wall-shaped flange 71 formed on the outer edge side, and the flange 71 is joined to the inner peripheral edges of the opening rail 6 and the rear pillar 5.

[0004]

In the above-described conventional structure, as shown in FIG. 9, the forked portion T has a closed cross section with a series of roof side rails 4 and a rear pillar 5,
The closed cross sections of the opening rail 6 are combined to form a hollow shape. For this reason, when a torsional force acts on the vehicle body, stress concentrates on the three-forked portion T, particularly on the rear end of the concave roof drip portion 3, and the forked portion may be deformed. This may cause a problem such as poor closing of the back door. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rear vehicle body structure that enhances the rigidity of a fork at an upper corner portion of a back door opening and prevents the back door opening from being deformed.

[0005]

SUMMARY OF THE INVENTION A roof side rail having a closed cross section which is connected to a side edge of a roof panel of a vehicle to form a roof drip portion having a concave cross section at a connection portion in a longitudinal direction of the vehicle body, and extends from the roof side rail. A rear pillar having a closed cross section that forms a side edge of the back door opening, and an opening rail having a closed cross section that forms an upper edge of the back door opening along a rear edge of the roof panel are gathered to form a T-shaped trifurcation. In the rear body structure provided with an opening frame that forms a back door opening edge flange along the inner peripheral corner of the three-forked portion, the outer peripheral portion of the opening frame is extended into the three-forked portion, and the extension is performed. Part, the roof side rail, the rear pillar, and the opening rail intersect the closed cross section of the three-pronged section where the closed communication section collectively communicates, and partitions the inside of the closed cross section, and Forming a reinforcing wall that binds with the rear end of the roof drip unit, the trifurcation a double closed cross section.

[0006] At the fork, the roof side rail, the rear pillar and the opening rail are connected by the reinforcing wall, the fork has a double closed cross-sectional structure, and the rear end of the roof drip portion is connected to the reinforcing wall. Due to the connection, the rigidity of the forked portion is greatly improved.

[0007]

FIG. 1A shows one of the upper corners of a back door opening 1 in a rear body structure of the present invention. A roof side rail 4 which is joined along a side edge of the roof panel 2 and has a roof drip portion 3 having a concave cross section formed in the joint portion in the vehicle longitudinal direction.
A rear pillar 5 extending obliquely downward from the rear end of the roof side rail 4 and forming an opening side edge of the back door opening 1; and an opening of the back door opening 1 extending in the vehicle width direction along the rear end edge of the roof panel 2. The upper corner of the back door opening 1 where the opening rail 6 forming the upper edge is gathered is a T-shaped trifurcation T. At the opening edge of the back door opening 1,
An opening upper frame 8a along the rear edge of the opening rail 6, an opening corner frame 8b along the inner peripheral corner of the fork T, and an opening side frame 8c along the inner edge of the rear pillar 5 are connected in series to form a back door. An opening frame 8 forming an opening edge flange of the opening 1 is formed.

The rear pillar 5 is composed of an outer panel 51 extending the outer panel 41 of the roof side rail 4 and an inner panel 52 extending the inner panel 42 of the roof side rail 4.

As shown in FIGS. 1A and 4, the roof side rail 4 has a closed cross-sectional structure in which outer and inner edges of an outer panel 41 and an inner panel 42 are overlap-welded, respectively. The joint between the inner edges of the panels 41 and 42 is overlap-welded along the side edge of the roof panel 2 curved substantially in a Z-shape in cross section, and the joint has a roof drip part having a substantially concave cross section. 3 is formed. The rear end of the roof drip portion 3 reaches the above-mentioned forked portion T.

As shown in FIGS. 1A and 5, the rear pillar 5 is formed by welding the outer edges of the outer panel 51 and the inner panel 52 together and by connecting the inner edges of the panels 51, 52 to the opening side. It has a closed cross-section structure connected via a frame 8c. The opening side frame 8c has a substantially U-shaped cross section, and one side is welded to the inner edge of the inner panel 52, and the upper end of the other side is welded to the inner edge of the outer panel 51.

On the other hand, the opening rail 6 is shown in FIG.
As shown in FIG. 6A and FIG. 6, a closed cross-sectional structure including an upper panel 61 and a lower panel 62 is provided. The lower panel 62 is wider than the upper panel 61 and projects rearward of the opening rail 6 having a closed cross section, that is, projects toward the back door opening 1 side. Then, the overhang portion 621
Further, an extension 21 extending from the rear end of the roof panel 2 that covers the opening rail 6 is overlap-welded to integrally form the opening upper frame 8a.

As shown in FIGS. 1A, 1B, 2 and 3, at the fork T, the end of the opening rail 6 is connected to the rear end of the roof side rail 4. That is, the terminal of the upper panel 61 of the opening rail 6 is sandwiched between the inner edge of the upper panel 41 of the roof side rail 4 forming the roof drip portion 3 and the side edge of the roof panel 2 and integrally welded with these. It is. On the other hand, the inner edge of the inner panel 42 of the roof side rail 4 is slightly joined to the side edge of the lower panel 62 of the opening rail 6 by slightly projecting inward in the vehicle width direction without being joined to the outer panel panel 41. Therefore, the forked portion T has a hollow structure in which the closed cross sections of the roof side rail 4, the rear pillar 5, and the opening rail 6 communicate with each other.

An opening corner frame 8b which forms a part of the opening frame 8 is provided along the inner peripheral corner of the trifurcation T. As shown in FIG. 2, the opening corner frame 8b includes a general portion 81 having a substantially U-shaped cross section and an outer peripheral vertical wall 811 of the general portion 81.
And an extending portion 82 extending outwardly from the front end.

The opening corner frame 8b has one end of the general portion 81 abutment-welded to the rear end face of the opening rail 6 and the end of the opening upper frame 8a to be covered with the extension 21 at the rear end of the roof panel 2. The other end of the general portion 81 is butted to the end of the opening side frame 8c. The opening corner frame 8b has an inner peripheral edge 821 of the extending portion 82 along the vertical wall 811 overlapped with the inner peripheral edge of the upper panel 61 on the opening rail 6 side and integrally connected thereto, and an outer panel 51 on the rear pillar 5 side. Is welded integrally to the inside edge of the. The extending portion 82 is extended so as to cross the forked portion T. The edge 822 on the side of the roof side rail 4 is overlap-welded to the rear end of the roof drip portion 3. The outer peripheral edge 823 of the extension 82 is
On the roof side rail 4 side, it is sandwiched between the outer edge of the outer panel 41 and the outer edge of the inner panel 42 and integrally connected to these outer edges. On the rear pillar 5 side, the outer edge of the outer panel 51 is connected to the outer edge. It is sandwiched between the outer edges of the inner panel 52 and is integrally connected to these outer edges.

In the three-forked portion T, the opening rail 6, the roof side rail 4 and the rear pillar 5 are connected by the extension 82 of the opening corner frame 8b, so that the connection strength is enhanced. Further, the hollow trifurcated portion T is formed by the extension 82 of the opening corner frame 8b.
Has a double closed cross-section structure to enhance torsional rigidity. Furthermore, since the extension portion 82 is connected to the rear end of the roof drip portion 3 that is particularly susceptible to torsion deformation at the fork portion T, the torsional rigidity of the fork portion T is further enhanced.

[0016]

According to the rear body structure of the present invention, the bonding strength and rigidity of the upper corner portion of the back door opening are enhanced, thereby preventing the deformation of the back door opening and preventing the back door from being closed improperly. Can be prevented. This structure is achieved by forming an extension portion on a conventionally used member without attaching a separate member, and integrally connecting the extension portion with the outer peripheral joint portion of the trifurcated portion.

[Brief description of the drawings]

FIG. 1 shows a rear body structure of the present invention, and FIG.
FIG. 1A is a perspective view of a main part showing an upper corner portion of a back door opening, and FIG. 1B is a cross-sectional view taken along a line IB-IB in FIG.

FIG. 2 is a perspective view of a main part of a back door opening frame used for the rear body structure of the present invention.

FIG. 3 is a cross-sectional view taken along a line III-III in FIG.

FIG. 4 is a cross-sectional view taken along a line IV-IV in FIG.

FIG. 5 is a cross-sectional view taken along a line VV in FIG.

FIG. 6 is a cross-sectional view taken along a line VI-VI in FIG.

FIG. 7 is a perspective view of a main part showing an upper corner portion of a back door opening of a conventional rear body structure.

FIG. 8 is a perspective view of a main part of a back door opening frame used for a conventional rear body structure.

9 is a cross-sectional view taken along a line IX-IX in FIG.

[Description of Signs] T Trifurcation 1 Backdoor opening 2 Roof panel 3 Roof drip 4 Roof side rail 5 Rear pillar 6 Backdoor opening upper rail 8b Backdoor opening corner frame (backdoor opening frame) 82 Extension (reinforcement wall) )

Claims (1)

[Claims] 1. A roof side rail having a closed cross-section, which is coupled to a side edge of a roof panel of a vehicle and forms a roof drip portion having a concave cross-section at a coupling portion in a vehicle longitudinal direction, and a side edge of a back door opening. A rear pillar having a closed cross section and a back door opening upper rail having a closed cross section forming an upper edge of the back door opening along the rear edge of the roof panel collectively form a T-shaped trifurcated portion. In a rear body structure provided with a back door opening frame that forms a back door opening edge flange along an inner peripheral corner portion, an outer peripheral portion of the back door opening frame is extended into a trifurcated portion, and a roof is provided by the extended portion. A side rail, a rear pillar, and a back door opening upper rail intersect the closed cross section of the above-mentioned three-forked portion where the upper rail is collectively connected, and partition the inside of the closed cross section. And a reinforcing wall connected to the rear end of the roof drip portion, and the forked portion has a double closed cross-sectional structure.