JP5475523B2 - Rear floor structure of automobile - Google Patents

Description

  The present invention includes a rear floor panel on which a rear seat is mounted, a cross member connected to the lower surface of the rear floor panel, a seat belt anchor attached to a cross member connecting portion of the rear floor panel, and a lower portion of the rear floor panel. The present invention relates to a rear floor structure of an automobile provided with a fuel tank.

  In this type of rear floor portion, a seat belt anchor for restraining a rear occupant may be attached to a connection portion of a cross member having a high rigidity of the rear floor panel with a bolt (see, for example, Patent Document 1).

  In some cases, the rear flange portion of the fuel tank is attached to the lower surface of the bottom wall of the cross member with a bolt (for example, see Patent Document 2).

Japanese Utility Model Publication No. 61-14154 Japanese Patent Laid-Open No. 04-1000073

  By the way, in the conventional rear floor portion structure, there is a possibility that the cross member may be broken in the cross member due to the pulling force of the seat belt anchor that acts at the time of the vehicle collision, and there is a concern that the restraining force of the occupant may be reduced. For this reason, in patent document 1, the large-sized reinforcement member is provided and the cross member is reinforced, The problem that a vehicle body weight and cost will increase so much arises.

  In addition, when the rear flange portion of the conventional fuel tank is attached to the lower surface of the bottom wall of the cross member, the bottom surface of the bottom wall is a horizontal surface, so the rear flange portion must be bent so as to be parallel to the lower surface of the bottom wall. In addition, the sealing performance of the welded portion of the flange portion may be impaired.

  The present invention has been made in view of the above-described conventional situation, and while suppressing the increase in the weight and cost of the vehicle body, the cross member can be prevented from collapsing to ensure the restraining force of the occupant, and the flange portion of the fuel tank. An object of the present invention is to provide a rear floor structure of an automobile that can ensure sealing performance.

  The present invention includes a rear floor panel having a kick-up portion on which a rear seat is mounted, a cross member having a hat-shaped cross-section that is connected to a lower surface of the kick-up portion so as to extend in the vehicle width direction, and the kick-up portion. An automobile rear floor comprising a seat belt anchor attached to the cross member connecting portion and a fuel tank disposed below the kick-up portion and having a flange portion attached to the bottom surface of the bottom wall of the cross member. The cross member is provided with a rein hose for connecting the front vertical wall and the rear vertical wall of the cross member in the vehicle longitudinal direction, and at least the front vertical wall of the cross member acts in the event of a vehicle collision. The seat belt anchor is formed to extend in a direction substantially coinciding with the pulling direction of the seat belt anchor, and the bottom wall of the cross member is It is characterized in that it is inclined in a direction along the flange portion of the charge tank.

  According to the rear floor portion structure of the present invention, the front vertical wall and the rear vertical wall of the cross member are connected by the rein hose, and at least the front vertical wall of the cross member substantially coincides with the tension direction of the load applied to the seat belt anchor. Therefore, the load acts in the shearing direction at the joint between the front vertical wall of the cross member and the reinhose, and hardly acts in the peeling direction. As a result, the deformation of the front vertical wall can be suppressed, and the cross member of the cross member can be prevented from being collapsed.

  Further, in the present invention, the rein hose can be made small enough to connect the front vertical wall and the rear vertical wall of the cross member, and the front vertical wall can be simply structured so as to be inclined to coincide with the pulling direction. The cross member can be prevented from collapsing with the necessary upper limit reinforcement. As a result, an increase in vehicle weight and cost can be suppressed as compared with a conventional structure in which a large reinforcing member is added.

  In the present invention, since the bottom wall of the cross member is inclined in the direction along the flange portion of the fuel tank, it is not necessary to bend the flange portion of the fuel tank along the bottom wall, or the bending angle can be reduced, and the fuel tank The sealing performance of the flange part can be ensured.

It is sectional drawing of the rear floor part of the motor vehicle by Example 1 of this invention. It is principal part sectional drawing of the said rear floor part. It is a top view of the said rear floor part. It is a perspective view of the rein hose arrange | positioned at the cross member of the said rear floor part.

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

  1 to 4 are views for explaining a rear floor structure of an automobile according to a first embodiment of the present invention. In the description of the present embodiment, front and rear and left and right mean front and rear and left and right when viewed in the vehicle traveling direction while seated on a seat mounted on an automobile unless otherwise specified.

  In the figure, reference numeral 1 denotes a rear floor portion that forms a rear compartment of an automobile. The rear floor portion 1 includes a rear floor panel 3 on which a rear seat 2 is mounted, a cross member 4 having a hat-shaped cross section that is disposed on the lower surface of the rear floor panel 3 so as to extend in the vehicle width direction, and the rear floor panel. Left and right seat belt anchors 5 and 5 to which seat belts (not shown) for restraining a rear occupant seated on the rear seat 2 are connected, and below the rear floor panel 3 And a fuel tank 6 disposed therein.

  On the rear side of the fuel tank 6 below the rear floor panel 3 and on the lower side of the cross member 4, an intermediate beam 8 of a torsion beam for supporting a rear wheel (not shown) so as to swing up and down is disposed ( (See FIG. 2). The intermediate beam 8 indicates the position when the vehicle is empty, the intermediate beam 8 ′ indicates the position at the maximum bound, and the intermediate beam 8 ″ indicates the position at the maximum rebound.

  The rear floor panel 3 includes a rear occupant footrest portion 3a, a kickup portion 3b formed in a stepped shape so as to be positioned at a height following the footrest portion 3a, and the kickup portion 3b. And a spare tire housing recess 3c formed in a stepped shape. Reference numeral 7 denotes a spare tire.

  The rear seat 2 is disposed above the kick-up portion 3b of the rear floor panel 3, and the fuel tank 6 is disposed below the kick-up portion 3b. The rear seat 2 has a seat cushion 2a and a seat back 2b.

  The cross member 4 has a structure in which lower ends of a front vertical wall 4b having a front flange 4a and a rear vertical wall 4d having a rear flange 4c are integrally coupled by a bottom wall 4e. The front and rear flanges 4 a and 4 c are connected to the lower surface of the rear floor panel 3.

  The fuel tank 6 has a structure in which flange portions 6c and 6c formed at the opening edges of the upper tank 6a and the lower tank 6b are joined together by welding over the entire circumference by welding.

  When viewed from the side of the vehicle, the flange 6c of the fuel tank 6 is formed in a straight line so as to be inclined obliquely downward in the front of the vehicle. When viewed from above the vehicle, the front flange 6d and the rear flange 6e are It is formed so as to extend linearly in the width direction.

  The front flange portion 6d of the fuel tank 6 is attached to a mounting seat 3a 'formed at the rear end portion of the footrest portion 3a of the rear floor panel 3 by means of two fastening bolts 15 and 15 on the left and right. A cross member 17 is joined to the rear end portion of the footrest portion 3 a of the rear floor panel 3 so as to cover the fastening bolt 15.

  The rear flange portion 6e of the fuel tank 6 is attached to the lower surface of the bottom wall 4e of the cross member 4 by two fastening bolts 16 and 16 on the left and right.

  The fastening bolts 15 and 16 are attached by inserting a tool T such as an impactor from below.

  Here, the bottom wall 4e of the cross member 4 is formed so as to incline rearwardly in a direction along the rear flange portion 6e of the fuel tank 6, more specifically in parallel with the rear flange portion 6e. . Thus, the rear flange portion 6e is attached to the cross member 4 without being bent.

  The mounting seat 3a 'to which the front flange portion 6d is attached is formed so as to incline forward and downward so as to be parallel to the front flange portion 6d.

  Rein hoses 10, 10 that connect the front vertical wall 4 b and the rear vertical wall 4 d of the cross member 4 in the vehicle front-rear direction are disposed at portions facing the left and right seat belt anchors 5 of the cross member 4. Yes.

  The left and right rein hoses 10 are arranged in the upper space in the cross member 4 and are formed on the lower surface of the kick-up portion 3b so as to face the seat belt anchor 5 and the upper wall portion 10a. The left and right side walls 10b and 10c are bent so as to extend downward from the left and right edges of 10a.

  The front and rear joint portions 10d and 10d formed on the upper wall portion 10a are disposed between the kick-up portion 3b and the front and rear flanges 4a and 4c of the cross member 4, and are stacked and integrated by welding. It is joined to.

  Further, the front joint portions 10e and 10e of the left and right wall portions 10b and 10c are joined to the front vertical wall 4b of the cross member 4 by welding, and the rear joint portions 10f and 10f are welded to the rear vertical wall 4d. It is joined.

  The seat belt anchor 5 is fastened and fixed to an overlapping portion of the kick-up 3b and the upper wall portion 10a of the rein hose 10 by an anchor bolt 11 inserted from above.

  In the kick-up 3b, a stepped bead portion 3e formed so as to surround the seed belt anchor 5 is recessed.

  By arranging the seat belt anchor 5 in the bead portion 3e, the tensile force applied to the seat belt anchor 5 acts on the welded joint portion of the kick-up portion 3b with the cross member 4 by the deformation of the bead portion 3e. Stress can be relieved, and as a result, the occupant's restraint can be enhanced.

  Further, since the anchor bolt 11 is positioned below the general floor surface by the amount of the bead portion 3e, the cushion thickness of the seat cushion 2a can be increased accordingly.

  The front vertical wall 4b of the cross member 4 is formed so as to extend in a direction substantially coinciding with the pulling direction F of the seat belt anchor 5 that acts during a vehicle collision. Specifically, the front vertical wall 4b is largely inclined forward with respect to the rear vertical wall 4d.

  The pulling direction F acting on the seat belt anchor 5 is slightly different depending on the occupant's physique and the like, and thus is set to have an angle θ of about 10 degrees with respect to the horizontal line a.

  According to this embodiment, the front vertical wall 4b and the rear vertical wall 4d of the cross member 4 are connected by the reinhose 10 so that the front vertical wall 4b of the cross member 4 substantially coincides with the pulling direction F of the seat belt anchor 5. Since it is tilted forward so as to extend in the direction, almost no force in the separating direction is applied to the joint between the front vertical wall 4b of the cross member 4 and the reinhose 10, and only a force in only the shearing direction is applied. It becomes. As a result, the deformation of the front vertical wall 4b is suppressed, and the cross-section of the cross member 4 can be prevented from being collapsed.

  In this embodiment, the rein hose 10 can be made small enough to connect the front vertical wall 4b and the rear vertical wall 4d of the cross member 4 and the front vertical wall 4b is inclined so as to coincide with the pulling direction F. Because of this structure, the cross-section of the cross member 4 can be prevented from being collapsed with the necessary upper limit reinforcement, and the increase in vehicle weight and cost can be reduced as compared with the case where a conventional large reinforcing member is added.

  In this embodiment, since the bottom surface of the bottom wall 4e of the cross member 4 is formed so as to be parallel to the rear flange portion 6e of the fuel tank 6, the rear flange portion 6e can be attached to the cross member 4 without being bent. In particular, it is possible to prevent the sealing performance of the rear flange portion 6e from deteriorating.

  The welding of the flange portion of the fuel tank is performed by so-called seam welding in which the base is continuously welded by rotating the electrode while applying pressure and applying current using a roller electrode. In the case of this seam welding, there is a concern that welding is interrupted at the bent part of the flange part and the sealing performance is deteriorated. However, in this example, since there is no bent part, it is possible to reliably prevent welding interruption and seal Can be secured.

  In this embodiment, since the bottom wall 4e of the cross member 4 is inclined rearwardly, an access space for the tool T can be secured behind the intermediate beam 8, and workability when the fuel tank 6 is attached is improved. Can be improved. That is, when the bottom wall of the cross member is horizontal, the tool may interfere with the intermediate beam, and there is a problem that workability is low.

DESCRIPTION OF SYMBOLS 1 Rear floor part 2 Rear seat 3 Rear floor panel 3b Kick-up part 4 Cross member 4b Front vertical wall 4d Rear vertical wall 4e Bottom wall 5 Seat belt anchor 6 Fuel tank 6e Rear flange part 10 Reinhose F Pull direction

Claims (1)

A rear floor panel having a kick-up portion on which a rear seat is mounted;
A cross member having a cross-sectional hat shape that is connected to the lower surface of the kick-up portion so as to extend in the vehicle width direction and opens upward;
A seat belt anchor attached to the cross member connecting portion of the kick-up portion;
A rear floor portion structure of an automobile including a fuel tank disposed below the kick-up portion and having a flange portion attached to the bottom surface of the bottom wall of the cross member;
In the cross member, a rein hose that connects the front vertical wall and the rear vertical wall of the cross member in the vehicle front-rear direction is provided,
At least the front vertical wall of the cross member is formed to extend in a direction substantially coinciding with a tension direction of a load acting on the seat belt anchor at the time of a vehicle collision,
The rear floor structure of an automobile, wherein a bottom wall of the cross member is inclined in a direction along a flange portion of the fuel tank.

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