JP5514043B2 - Rear body structure of automobile - Google Patents

Description

  The present invention relates to a rear vehicle body structure including a rear floor panel having a spare tire housing recess and a traction / locking hook disposed on a lower surface of a bottom wall of the housing recess.

  In automobiles, the area around the floor of the tow hook is reinforced from the viewpoint of increasing the strength against the tensile load of the tow hook used during towing and transportation. For example, in Patent Document 1, a box-shaped bracket to which a tow hook is attached is coupled to a floor panel, and a cross-sectional hat-shaped reinforcing member extending in the vehicle width direction is coupled to the front of the floor panel bracket, and the reinforcement is performed. A structure in which the member and the bracket are coupled by a reinforcing member extending in the front-rear direction is employed.

JP 2004-114734 A

  By the way, when the structure is such that the tensile load acting on the traction hook is distributed from the bracket to the reinforcing member via the reinforcing member and transmitted as in the conventional structure, a large reinforcing member is required, and the number of parts and There is a problem that the vehicle weight increases. In particular, it is a structure that is difficult to adopt in a small vehicle that is desired to be light and low in cost, and there is room for studying a structure that achieves light and low cost.

  The present invention has been made in view of the above-described conventional situation, and provides a rear vehicle body structure that can increase the strength against a tensile load acting on a traction / locking hook without increasing the number of parts and the weight of the vehicle body. The challenge is to do.

  The invention of claim 1 is a rear body structure of an automobile comprising a rear floor panel in which a spare tire housing recess is formed, and a traction / locking hook disposed on the bottom surface of the bottom wall of the housing recess, A first floor rein hose having a hat-shaped cross section is coupled to the lower surface of the bottom wall portion of the housing recess, extending in the vehicle front-rear direction and having a front end positioned at a substantially central portion of the housing recess. A second floor rein hose having a hat-shaped cross section formed so as to face the first floor rein hose with the bottom wall interposed therebetween is coupled to the top surface of the bottom wall portion, The first floor rein hose is characterized in that it is attached to the rear part of the lower surface.

  According to a second aspect of the present invention, in the rear body structure of the automobile according to the first aspect, the height of the cross section of the first closed cross section formed by the first floor rein hose and the bottom wall portion is from the rear side to the front side. The sectional height of the second closed cross section formed by the second floor rein hose and the bottom wall portion is set so as to decrease from the front side to the rear side, and The sum of the cross-sectional heights of the first and second closed cross-sections is set so as to be substantially the same over the entire length in the front-rear direction.

  According to the rear vehicle body structure of the first aspect of the present invention, the bottom wall portion is joined to the bottom surface of the bottom wall portion of the housing recess with the first floor rein hose having a hat-shaped cross section whose front end is located at the center of the housing recess. A second floor rein hose having a hat-shaped cross section facing the first floor rein hose across the bottom wall portion is coupled to the upper surface, and a traction / locking hook is attached to the lower rear portion of the first floor rein hose. .

  Since it comprised in this way, the tensile load which acts on a traction and lashing hook is applied to the whole accommodation recessed part via the 1st, 2nd floor rein hose which has the closed section couple | bonded across the bottom wall part of the accommodation recessed part. It is transmitted in a distributed manner, and the strength against the tensile load can be increased with the minimum necessary number of parts. As a result, the conventional large reinforcing member can be eliminated, and the number of parts and the weight of the vehicle body can be reduced accordingly.

  In the invention of claim 2, the cross-sectional height of the first closed cross section formed by the first floor rein hose and the bottom wall portion is reduced from the rear side to the front side, and formed by the second floor rein hose and the bottom wall portion. The sectional height of the second closed cross section made smaller from the front side to the rear side, and the sum of the cross sectional heights of the first and second closed cross sections was made substantially the same over the entire length, so there was no constant point A closed cross section with a height can be formed, and the strength against a tensile load acting on the traction / locking hook can be further increased.

It is a top view of the rear part vehicle body of the motor vehicle by Example 1 of the present invention. FIG. 2 is a sectional view of the rear vehicle body (a sectional view taken along line II-II in FIG. 1). It is a disassembled perspective view of the said rear vehicle body.

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

  1 to 3 are views for explaining a rear body structure of an automobile according to a first embodiment of the present invention. In the description of the present embodiment, the terms front / rear and left / right mean front / rear and left / right when viewed in the vehicle traveling direction while seated on a seat mounted on the vehicle, unless otherwise specified.

  In the figure, reference numeral 1 denotes a rear body of the automobile. The rear vehicle body 1 includes a rear floor panel 4 having a housing recess 4a that can accommodate a spare tire 6, and a traction / locking hook 7 disposed on the bottom surface of the bottom wall 4b of the housing recess 4a.

  The rear vehicle body 1 includes left and right rear side members 2 and 2 extending in the vehicle front-rear direction coupled to the left and right outer bottom surfaces of the housing recess 4a of the rear floor panel 4, and housing recesses 4a of the rear floor panel 4. And a rear cross member 3 extending in the vehicle width direction and coupled to the front lower surface. The left and right end portions of the rear cross member 3 are coupled to the left and right rear side members 2. Further, rear wheel houses 5 and 5 standing upward are coupled to the left and right edge portions 4e and 4e of the rear floor panel 4.

  The housing recess 4a is formed integrally with the rear floor panel 4, and is formed on the bottom wall portion 4b, a peripheral wall portion 4c extending upward following the bottom wall portion 4b, and a rear edge of the bottom wall portion 4b. And a rear vertical wall portion 4d that is erected upward. A lower edge portion 9a of the lower back panel 9 extending in the vehicle width direction is coupled to the rear vertical wall portion 4d.

  A wide main bone bead 4f extending in the front-rear direction is formed on the bottom wall 4b of the housing recess 4a. The main bone bead 4f is formed to bulge so as to protrude upward, and extends from the rear vertical wall portion 4d through the center of the bottom wall portion 4b to the front midway portion of the peripheral wall portion 4c.

  A plurality of sub-bone beads 4g extending radially from the center of the bottom wall 4b of the receiving recess 4a are formed. Each of the sub-bone beads 4g bulges upward to form a convex shape, and extends to the middle portion of the peripheral wall portion 4c following the main bone bead 4f. In addition, three beads 4h are formed at predetermined intervals in the circumferential direction at the left and right front opening edges of the housing recess 4a.

  A first floor rein hose 10 having a cross-sectional hat shape extending in the front-rear direction is disposed on the bottom surface of the bottom wall portion 4b of the housing recess 4a, and the bottom wall portion 4b is sandwiched between the top surface of the bottom wall portion 4b. A second floor rein hose 11 having a hat-shaped cross section facing the first floor rein hose 10 is disposed, and the traction / locking hooks 7 are disposed at the lower rear portion of the first floor rein hose 10. .

  The first floor rein hose 10 is disposed on the lower surface of the main bone bead 4f and has a strip-like rein hose body 10a formed to bulge downward, and an outer peripheral flange 10b formed on the outer peripheral edge of the rein hose body 10a. And have.

  The second floor rein hose 11 is disposed on the upper surface of the main bone bead 4f, and has a strip-shaped rein hose body 11a bulging upward, and an outer peripheral flange 11b formed on the outer periphery of the rein hose body 11a. And have.

  The rear portion 10c of the first floor rein hose 10 is bent upward, and the rear flange portion 10d of the outer peripheral flange 10b is stacked on the lower edge portion 9a of the lower back panel 9 together with the rear vertical wall portion 4d. Are connected by spot welding.

  The rear part 11c of the second floor rein hose 11 is bent upward, and the rear flange part 11d of the outer peripheral flange 11b is connected to the rear flange part 10d of the first floor rein hose 10 together with the rear vertical flange part 4d. They are joined together by spot welding.

  The left and right flange portions 10e and 10e and the front flange portion 10f of the outer peripheral flange 10b of the first floor rein hose 10 are the left and right flange portions 11e of the outer peripheral flange 11b of the second floor rein hose 11 together with the bottom wall portion 4b. 11e and the front flange portion 11f are overlapped and joined by spot welding.

  The first floor rein hose 10 is extended so that the front end portion 10g thereof is positioned at the center of the housing recess 4a, that is, at the center of the spare tire 6.

  A support seat 11g that is convex upward is formed in a portion of the second floor rein hose 11 that faces the front end 10g. A nut 15 is attached to the lower surface of the support seat 11g by welding, and a fixing bolt 14 for fixing the spare tire 6 is detachably screwed to the nut 15.

  When viewed from above the vehicle, the secondary bone beams 4g extend radially around the support seat 11g of the second floor rein hose 11.

  A first closed cross section A is formed by the first floor rein hose 10 and the bottom wall portion 4b, and a second closed cross section B is formed by the second floor rein hose 11 and the bottom wall portion 4b.

  The cross-sectional height H1 of the first closed cross-section A is set to be the largest at the rear end A ′ and gradually decrease from the rear end A ′ to the front side. The first closed cross-section A has a first rear closed cross-section A ″ that extends upward following the rear A ′.

  The cross-sectional height H2 of the second closed cross-section B is set to be the largest at the front end B ′ and gradually decrease from the front end B ′ to the rear side. The second closed cross-section B has a second rear closed cross-section B ″ that extends upward while continuing to the rear end. The second rear closed cross-section portion B ″ and the first rear cross-section portion A ″ are arranged so as to overlap in the vertical direction, and have a shape raised so as to be continuous with the lower back panel 9. .

  The sum of the section heights H1 and H2 of the first and second closed sections A and B is set to be substantially the same over the entire length in the front-rear direction.

  The traction / locking hook 7 is formed by bending a single bar so as to form a loop shape in a side view, and is formed in a curved shape following the substantially straight horizontal portion 7a and the horizontal portion 7a. It has a loop portion 7b and an upwardly extending portion 7c extending upward following the loop portion 7b.

  The tow / locking hook 7 is fixed to the rear corner portion of the first floor rein hose 10 by welding. Specifically, recessed groove portions 10h and 10h are formed in the rein hose main body 10a and the rear portion 10c of the first floor rein hose 10, respectively, and the traction / locking hook 7 has a horizontal portion 7a and an upper extension portion 7c thereof. These are welded to the first floor rein hose 10 in a state of being bridged and engaged with the respective grooves 10h.

  According to the present embodiment, the first floor rein hose 10 having a hat-shaped cross section is coupled to the lower surface of the bottom wall portion 4b of the housing recess 4a of the rear floor panel 4 so that the front end 10g is located at the center of the housing recess 4a. The second floor rein hose 11 having a hat-shaped cross section facing the first floor rein hose 10 across the bottom wall 4b is coupled to the upper surface of the bottom wall 4b, and the rear corner of the first floor rein hose 10 is joined The towing and lashing hook 7 is attached.

  Since it comprised in this way, the tension | pulling load F1, F2 which acts on the tow | pulling and securing hook 7 is the 1st, 2nd which has the 1st, 2nd closed cross sections A and B couple | bonded across the bottom wall part 4b. It will be distributed and transmitted to the whole accommodation recessed part 4a via the floor reinhose 10 and 11, and the intensity | strength with respect to a tensile load can be raised with a minimum required number of parts. As a result, the conventional large reinforcing member can be dispensed with, the number of parts and the weight of the vehicle body can be reduced accordingly, and it can be adopted for a small vehicle.

  More specifically, the longitudinal load F1 acting in the vehicle longitudinal direction acting during towing is transmitted from the first and second closed cross sections A and B to the entire housing recess 4a via the main bone beads 4f and the sub bone beads 4g. Further, the vertical tensile load F2 acting when the vehicle is fixed is transmitted to the entire lower back panel 9 from the first and second rear closed cross sections A ″ and B ″.

  Further, the rear portions 10c and 11c of the first and second floor rein hoses 10 and 11 are raised so as to be connected to the lower back panel 9, and the tow / locking hook 7 is set at the raised corner portion. The input positions of the tensile loads F1 and F2 when towing and when the vehicle is fixed approach the housing recess 4a of the floor panel 4, so that the load can be efficiently transmitted to the floor panel 4.

  In this embodiment, the cross-sectional height H1 of the first closed cross section A formed by the first floor rein hose 10 and the bottom wall portion 4b is reduced from the rear side to the front side, so that the second floor rein hose 11 and the bottom The sectional height H2 of the second closed section B formed with the wall 4b is reduced from the front side to the rear side, and the sum of the sectional heights H1 and H2 of the first and second closed sections A and B is increased. Since the height is substantially the same over the entire length in the direction, a closed cross section having a constant height can be formed, and the strength against the tensile loads F1, F2 acting on the traction / locking hook 7 can be further increased. .

  In this embodiment, since the support seat 11f for fixing the spare tire 6 is integrally formed at the front end portion of the second floor rein hose 11, the number of parts can be reduced as compared with the case where other conventional parts are arranged.

DESCRIPTION OF SYMBOLS 1 Rear vehicle body 4 Rear floor panel 4a Housing recessed part 4b Bottom wall part 6 Spare tire 7 Towing and securing hook 10 First floor rein hose 10c Rear part 10g Front end part 11 Second floor rein hose A First closed cross section B Second closed cross section H1 , H2 Section height

Claims (2)

A rear vehicle body structure including a rear floor panel in which a spare tire housing recess is formed, and a traction / locking hook disposed on a bottom surface of the bottom wall of the housing recess,
A first floor rein hose having a hat-shaped cross section is coupled to the bottom surface of the bottom wall portion of the housing recess, extending in the vehicle front-rear direction and having a front end positioned at a substantially central portion of the housing recess,
A second floor rein hose having a hat-shaped cross section formed so as to face the first floor rein hose across the bottom wall is coupled to the upper surface of the bottom wall of the housing recess,
The rear body structure of an automobile, wherein the traction / locking hook is attached to a lower rear portion of the first floor rein hose. In the rear body structure of the automobile according to claim 1,
The height of the first closed cross section formed by the first floor rein hose and the bottom wall portion is set so as to decrease from the rear side to the front side,
The cross-sectional height of the second closed cross section formed by the second floor rein hose and the bottom wall portion is set so as to decrease from the front side to the rear side,
The rear body structure of an automobile, wherein the sum of the cross-sectional heights of the first and second closed cross sections is set to be substantially the same over the entire length in the front-rear direction.

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