JP2006218995A - Rear body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear body structure of an automobile as a frame structure in which the tail of each side member intersects across the undersurface of a rear end skeleton part, capable of enhancing the stiffness of the whole frame structure around the rear end effectively using a simple means. <P>SOLUTION: The rear body structure of the automobile is equipped with a rear floor pan 7 formed from a panel member, side members 3 each having a hat-shaped section positioned at the side across the vehicle width of the rear floor pan and installed on the undersurface of the rear floor pan, and the rear end skeleton part 2 extending across the vehicle width while the undersurface is connected with the over-part of the tail of the side member, in which a downward extending panel 8 is installed locally on the rear surface of the rear end skeleton part and is coupled with the tail of the side member 3 to block the opening in the tail part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rear body structure of an automobile, and more particularly to a skeleton structure around a rear end of a hatchback car or the like in which a tailgate is assembled to a rear part of a vehicle body.

  As shown in FIGS. 4 and 5, the skeleton structure around the rear end of this type of vehicle is a composite of a pair of left and right rear pillar skeleton portions 1, a rear end skeleton portion 2, and a pair of left and right side members (vehicle body longitudinal skeleton portions) 3. As a result, the skeletal rigidity is maintained.

  In FIG. 4, the rear end opening of the side member 3 having a hat-shaped cross section abuts the flange portion 3 a attached to the periphery of the opening on the front surface (rear end inner panel) of the rear end frame 2 having a cross-section box shape. FIG. 5 shows a skeletal structure that is applied when an engine or a spare tire is arranged under the floor from the viewpoint of performance or layout. The rear end portion of the side member 3 intersects the lower surface portion of the rear end skeleton portion 2 and is opened to the rear of the vehicle body. Flange portions 3b attached to the left and right side edges of the side member 3 are formed on the lower surface portion of the rear end skeleton portion 2. The skeletal structure to be joined is shown.

JP 2003-341559 A

  However, in the skeleton structure shown in FIG. 5, unlike the skeleton structure shown in FIG. 4, the rear end skeleton portion 2 and the side member 3 are not rigidly coupled. The displacement of the side member 3 (see arrows S1 and S2 in FIG. 6) is not sufficiently transmitted to the cabin including the rear pillar skeleton part 1 and the rear end skeleton part 2 and the like, resulting in a decrease in skeleton rigidity. .

  That is, the displacement of the side member 3 and the displacement of the cabin (see arrows C1 and C2 in FIG. 6) are generated separately and are not generated in a chained manner, so that the amount of displacement is increased by resonance or the like. The phenomenon that the displacement of the cabin becomes larger than the displacement of 3 or the like occurs.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rear body of a vehicle in which the rear end portion of the side member intersects the lower end portion of the rear end skeleton portion, and the rigidity of the entire skeleton structure around the rear end can be effectively improved by simple means. To provide a structure.

In order to achieve the above object, the rear body structure of the automobile according to the present invention is configured as follows.
(1) A rear floor pan formed of a panel member, a side member having a hat-shaped cross section that is located on a side of the rear floor pan in the vehicle width direction and is assembled to a lower surface of the rear floor pan, and an upper rear end of the side member And a rear end skeleton that extends in the vehicle width direction and has a lower extension locally provided on the rear surface of the rear end skeleton, and the lower extension is coupled to the rear end of the side member. It is characterized by that.

  (2) The downward extension has a bumper mounting portion extending further downward.

  (3) The downward extension is formed separately from the rear end skeleton.

  (4) The downward extension is integrally formed with the rear end skeleton.

  According to the inventions of (1), (3), and (4), the rear end skeleton and the side member are rigidly coupled to each other by a simple structure in which the rear end skeleton is provided with a downward extension. The displacement of the cabin is caused in a chain and the rigidity of the entire skeletal structure around the rear end can be improved.

  According to the invention of (2), when the rear bumper is engaged with the bumper mounting portion, the mounting accuracy of the rear bumper and the lower rigidity of the rear bumper can be improved.

  Hereinafter, the rear body structure of an automobile according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a main part of a skeleton structure around a rear end showing an embodiment of the present invention, FIG. 2 is an explanatory view of the same structure, FIG. 1 (a) is a front view of the main part, and FIG. (A) AA sectional view, FIG. 3: is a rear perspective view of a hatchback vehicle.

  As shown in FIGS. 1 and 3, the skeleton structure around the rear end of the hatchback vehicle in which the tailgate 10 is assembled to the rear portion of the vehicle body is a pair of left and right rear pillar skeleton portions 1, a rear end skeleton portion 2, and a pair of left and right side members (front and rear of the vehicle body). (Directional skeleton part) 3 is combined to maintain the skeleton rigidity. In FIG. 3, the rear end skeleton 2 is appropriately covered with a rear bumper 11.

  As shown in FIG. 2, the rear end skeleton 2 is formed in a cross-sectional box shape by a rear end outer panel 4 and a rear end inner panel 5 assembled inside the outer panel 4 and extends in the vehicle width direction.

  A flange portion 7a of a rear floor pan 7 formed of a panel member is joined to the inside (strictly speaking, the flange portion of the rear end inner panel 5) of the rear end skeleton portion 2 by spot welding or the like.

  A side member 3 having a hat-shaped cross section is formed on the lower surface of the rear floor pan 7 to form a closed cross-sectional structure by joining flange portions 3b attached to the left and right side edges thereof by spot welding or the like. The end portion opens at the rear of the vehicle body, intersecting the lower surface portion (lower joint portion 6) of the rear end skeleton portion 2 at a right angle.

  The upper half of the lower extension panel (lower extension) 8 is joined to a part of the outer surface of the rear end outer panel 4 by spot welding or the like, and the lower half of the lower extension panel 8 is connected to the rear end of the side member 3. Combined. In the example of illustration, it abuts on the flange part 3a attached to the periphery of the rear-end opening of the side member 3, is joined by spot welding etc., and the rear-end opening part of the side member 3 is obstruct | occluded.

  The lower extension panel 8 is formed in a size that covers the rear end opening of the side member 3 and covers the entire corner of the rear end outer panel 4. The skeleton structure around the rear end having the above structure is appropriately covered with the rear bumper 11 (see FIG. 3).

  Due to such a configuration, the rear end skeleton 2 and the side member 3 are rigidly coupled to each other by a simple structure in which the lower extension panel 8 is locally attached to the rear end outer panel 4 in a fixed plane.

  As a result, the displacement of the side member 3 and the displacement of the cabin composed of the rear pillar skeleton 1 and the rear end skeleton 2 (see various displacements indicated by arrows in FIG. 6) are generated in a chained manner. The rigidity of the entire surrounding skeleton structure can be improved.

  In addition, in the said Example, although the downward extension panel 8 was formed separately from the rear end outer panel 4, you may form integrally. Further, the shape and size are not limited to the illustrated examples and can be changed as appropriate.

  Further, as shown by a two-dot chain line in FIG. 1, a part of the lower extension panel 8 (including one integrally formed with the rear end outer panel 4) is further extended downward to form an L-shaped bumper mounting portion 9. You may do it. According to this, since the rear bumper 11 (see FIG. 3) is engaged with the bumper mounting portion 9 on a certain plane, the mounting accuracy of the rear bumper 11 and the lower rigidity of the rear bumper 11 can be improved.

It is a principal part perspective view of the frame | skeleton structure around the rear end which shows one Example of this invention. Similarly, FIG. 1A is a front view of the main part, and FIG. 1B is a cross-sectional view taken along the line A-A in FIG. It is a rear perspective view of a hatchback vehicle. It is a principal part perspective view of the frame | skeleton structure around the rear end of a prior art example. It is a principal part perspective view of the frame structure around the rear end of a different conventional example. It is explanatory drawing of the displacement of a side member and the displacement of a cabin.

Explanation of symbols

  1 Rear pillar frame part, 2 Rear end frame part, 3 Side member, 3a, 3b Flange part, 4 Rear end outer panel, 5 Rear end inner panel, 6 Lower joint part, 7 Rear floor pan, 7a Flange part, 8 Lower extension panel, 9 Bumper installation Part, 10 Tailgate, 11 Rear bumper.

Claims (4)

A rear floor pan formed of panel members;
A side member having a hat-shaped cross section, which is located on the side of the rear floor pan in the vehicle width direction and is assembled to the lower surface of the rear floor pan;
A rear end skeleton part having a lower surface connected to the rear end upper part of the side member and extending in the vehicle width direction, and
A rear body structure of a vehicle, wherein a lower extension portion is locally provided on a rear surface of the rear end skeleton portion, and the lower extension portion is coupled to a rear end portion of the side member.   2. The rear body structure of an automobile according to claim 1, wherein the lower extension portion further includes a bumper mounting portion extending downward.   The rear body structure of an automobile according to claim 1 or 2, wherein the lower extension is formed separately from the rear end skeleton.   The rear body structure of an automobile according to claim 1 or 2, wherein the lower extension part is formed integrally with a rear end skeleton part.

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