JP2014189248A - Vehicle body rear part structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rear part structure capable of receiving a load of a rear seat and a rear seat belt by the whole rear floor panel, by preventing bending of the rear floor panel by impact in a rear collision, without providing a new reinforcement member.SOLUTION: A vehicle body rear part structure comprises: a rear floor panel 2 for forming a storage recessed part 1 of a spare tire; a first floor reinforcement 3 of a cross-sectional hat shape arranged on a bottom wall part under surface of the storage recessed part 1 of the panel 2; a towing hook 4 installed in the first floor reinforcement 3; a first rear cross member 5 arranged on the substantially central under surface side of the storage recessed part 1; a second floor reinforcement 6 of a cross-sectional lower opening hat shape oppositely arranged to the first floor reinforcement 3 by sandwiching the rear floor panel 2; and a second rear cross member 7 in a vehicle width direction arranged on the under surface side of a front rear floor panel 2 of a front wall part of the storage recessed part 1, and a front end part 6a of the second floor reinforcement 6 is connected to a rear seat belt anchor 9 by extending up to an upper position of the second rear cross member 7.

Description

  The present invention is attached to a rear floor panel in which a recess for storing a spare tire is formed, a floor reinforcement having a hat-shaped cross section disposed in a vehicle body front-rear direction on a lower surface of a bottom wall of the storage recess in the rear floor panel, and a floor reinforcement. The present invention relates to a rear structure of a vehicle body including a tow hook and a cross member in the vehicle width direction disposed in front of a storage recess.

  Conventionally, in a rear part of a vehicle body in which a spare tire is stored, a recess for storing a spare tire is formed on a rear floor panel, and a first floor reinforcement having a hat-shaped cross section is arranged on the lower surface of the bottom wall of the storage recess in the longitudinal direction of the vehicle. A tow hook is attached to the lower surface side of the first floor reinforcement by welding or the like, and a hat-shaped second floor reinforcement having a cross-section opening downward is opposed to the first floor reinforcement across the floor panel. (Refer to Patent Document 1).

  Further, as the rear structure of the vehicle body, the left and right rear side members extending in the vehicle front-rear direction coupled to the left and right outer bottom surfaces of the housing recess of the rear floor panel, and the vehicle width direction coupled to the front lower surface of the housing recess of the rear floor panel And a second rear cross member extending in the vehicle width direction, which is coupled to the lower surface of the rear floor panel in front of the housing recess and is provided with an anchor for the rear seat. The left and right end portions of the first and second rear cross members are coupled to the left and right rear side members. In addition, a rear wheel house that rises upward is coupled to the left and right edges of the rear floor panel.

  By the way, the front end portion of the second floor reinforcement is extended so as to be positioned at the center of the spare tire, which is the central portion of the storage recess, and the front end portion of the first floor reinforcement is the front end portion of the second floor reinforcement. A nut for fixing the spare tire is welded, and a bolt inserted from the second floor reinforcement side is detachably screwed to the nut (see Patent Document 1). ).

JP 2006-29343 A (paragraphs 0015 to 0033 and FIG. 3)

  However, in the above-described conventional vehicle body rear structure, the front end of both the first and second floor reinforcements extends only to the position of the center of the spare tire, which is the central part of the storage recess, Since the first floor reinforcement is not coupled to the second rear cross member provided with the rear seat anchor, the floor panel bends at the front end, which is the end point of the first and second floor reinforcements, at the time of rear collision. There is a fear.

  In addition, when a cross member is separately provided in order to reinforce the break point at the time of the rear impact described above, the hat cross section of the first floor reinforcement or the second floor reinforcement has a structure at a portion intersecting with the cross member. The upper panel will be cut off, and the floor panel will be bent and the energy transmission will be cut off at the cut position. Even if a reinforcing member is separately provided, it is sufficient to cause an increase in weight and cost. There is no reinforcement.

  Further, it is desirable to receive the load of the rear seat and the rear seat belt on the entire rear floor panel. However, in the above-described conventional structure, a separate reinforcing member must be provided, resulting in an increase in weight and cost.

  The present invention provides a rear structure that can prevent the rear floor panel from being bent due to an impact at the time of rear collision without providing a new reinforcing member and can receive the load of the rear seat and the rear seat belt on the entire rear floor panel. Objective.

  In order to achieve the above-described object, the vehicle body rear structure of the present invention has a rear floor panel in which a recess for storing a spare tire is formed, and a lower surface of the bottom wall of the storage recess in the rear floor panel in the vehicle front-rear direction. In the rear structure of a vehicle body comprising a floor reinforcement having a cross-sectional hat shape, a tow hook attached to the floor reinforcement, and a cross member in the vehicle width direction disposed in front of the storage recess, A second floor having a hat-shaped cross section that is open in the longitudinal direction of the vehicle body and disposed in the front-rear direction of the vehicle body, facing the first floor reinforcement across the rear floor panel, with the floor reinforcement on the lower surface of the bottom wall of the storage recess as the first floor reinforcement. Reinforcement is provided, and the front end of the second floor reinforcement is a rear seat belt anchor It is characterized in that it is connected to the cross member that also serves as (claim 1).

  According to the first aspect of the present invention, the second floor reinforcement is disposed opposite to the first floor reinforcement disposed on the lower surface of the bottom wall portion of the storage recess of the spare tire with the rear floor panel interposed therebetween, Because the front end of the two-floor reinforcement is connected to the cross member that also serves as the rear seat belt anchor, the rear floor panel can be reinforced by the second floor reinforcement, and it can Bending of the rear floor panel can be prevented.

  Furthermore, since the front end of the second floor reinforcement is connected to the cross member, the load of the rear seat and the rear seat belt can be distributed to the rear floor panel via the second floor reinforcement, without providing a new reinforcing member, The entire rear floor panel can receive the load of the rear seat and rear seat belt.

  Also, only the first floor reinforcement is provided on the lower surface of the rear floor panel, and the second floor reinforcement on the upper surface side of the rear floor panel does not protrude from the lower surface side, and piping and wiring are provided on the lower surface side of the rear floor panel. Space can be secured, and the degree of freedom of piping and wiring passing under the rear floor panel can be increased.

  Furthermore, since the surface rigidity of the entire rear floor can be improved together with the side members and the cross members, the occurrence of vibrations and abnormal noise due to the bending of the rear floor panel can be suppressed, and the steering stability performance can be improved.

1 is a perspective view of an embodiment of a vehicle body rear structure according to the present invention. It is a perspective view of the principal part of FIG. It is a schematic side view of FIG.

  Next, an embodiment of the rear body structure of an automobile according to the present invention will be described in detail with reference to FIGS.

  As shown in FIGS. 1 to 3, the rear structure of the vehicle body in this embodiment includes a rear floor panel 2 in which a storage recess 1 for a spare tire (not shown) is formed, and a bottom wall bottom surface of the storage recess 1 in the rear floor panel 2. A first floor reinforcement 3 having a hat-shaped cross section disposed in the longitudinal direction of the vehicle body, a tow hook 4 welded and attached to the first floor reinforcement 3, and a substantially central lower surface side of the storage recess 1 of the rear floor panel 2. A cross section disposed in the vehicle front-rear direction facing the first floor reinforcement 3 across the rear floor panel 2 and the first rear cross member 5 in the vehicle width direction disposed so as to be positioned at the center of the spare tire A second floor reinforcement 6 having a downward opening hat shape and a second rear cloth in the vehicle width direction disposed on the lower surface side of the rear floor panel 2 in front of the front wall portion of the storage recess 1. And a member 7.

  The first rear cross member 5 and the second rear cross member 7 are connected to the left and right rear side members 8 and 8 extending in the vehicle front-rear direction coupled to the left and right outer bottom surfaces of the housing recess 1 of the rear floor panel 2. Are connected to each other.

  The second rear cross member 7 is provided with a rear seat belt anchor, and a rear seat belt mounting bracket 9 is disposed with the floor panel 2 interposed therebetween and joined to the second rear cross member 7 so that the second floor reinforcement is provided. The front end portion 6a of 6 is extended along the front wall of the housing recess 1 to the upper position of the second rear cross member 7 with the floor panel 2 interposed therebetween, and is connected to the bracket 9 and the second rear cross member 7. ing. As described above, the second floor reinforcement 6 with the front end portion 6a extended reinforces the portion extending from the second rear cross member 7 of the floor panel 2 to the front end portion of the storage recess 1 to enhance the surface rigidity.

  By the way, the substantially central portion 6 b of the second floor reinforcement 6 is disposed so as to be positioned above the first rear cross member 5, and the front end portion of the first floor reinforcement 3 is below the first rear cross member 5. A nut for fixing a spare tire is welded to the front end of the first floor reinforcement 3 so that a bolt inserted from the second floor reinforcement side is detachably screwed to the nut. It has become. Note that flanges 6 c are formed on both the left and right sides of the second floor reinforcement 6.

  In this way, the front end 6a of the second floor reinforcement 6 disposed opposite to the first floor reinforcement 3 disposed on the lower surface of the bottom wall portion of the spare recess housing recess 1 with the rear floor panel 2 interposed therebetween, By extending to the upper position of the second rear cross member 7 also serving as a rear seat belt anchor and connecting to the bracket 9 and the second rear cross member 7, the second floor reinforcement 6 can be provided without providing a new reinforcing member. Thus, the rear floor panel 2 can be reinforced.

  Further, by connecting the front end of the second floor reinforcement 6 to the bracket 9 and the second rear cross member 7, the load of the rear seat and the rear seat belt can be distributed to the rear floor panel 2 via the second floor reinforcement 6. .

  Further, only the first floor reinforcement 3 is disposed on the lower surface of the rear floor panel 2, and the second floor reinforcement 6 on the upper surface side of the rear floor panel 2 does not protrude from the lower surface side. Piping and routing space can be secured on the lower surface side of the.

  Furthermore, the surface rigidity of the entire rear floor panel 2 together with the rear side member 8 and the rear cross members 5 and 7 can be improved, and the occurrence of vibration and noise due to the bending of the rear floor panel 2 can be suppressed.

  Therefore, according to the above-described embodiment, the front end portion 6a of the second floor reinforcement 6 extends to the position above the second rear cross member 7, and the extended front end portion of the second floor reinforcement 6 is attached to the bracket 9. Further, since the second floor reinforcement 6 is connected to the second rear cross member 7, the rear floor panel 2 can be reinforced, and the rear floor panel 2 can be prevented from being bent by an impact at the time of rear collision without providing a new reinforcing member. be able to.

  Further, by connecting the front end portion 6 a of the second floor reinforcement 6 to the second rear cross member 7, the load of the rear seat and the rear seat belt can be distributed to the rear floor panel 2 through the second floor reinforcement 6. Thus, it is possible to receive the load of the rear seat and the rear seat belt on the entire rear floor panel 2 without providing a new reinforcing member.

  In addition, since the second floor reinforcement 6 on the upper surface side of the rear floor panel 2 does not protrude on the lower surface side, a space for piping and wiring can be secured on the lower surface side of the rear floor panel 2, and piping passing under the rear floor can be secured. The degree of freedom of routing can be increased.

  Further, since the surface rigidity of the entire rear floor can be improved together with the rear side member 8 and the rear cross members 5 and 7, vibrations and abnormal noise due to the bending of the rear floor panel 2 can be suppressed, and steering stability performance can be improved. Improvements can be made.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  The second floor reinforcement 6 in the present invention is not limited to the shape described in the above-described embodiment. In short, the front end portion extends to the upper position of the cross member that also serves as the rear seat belt anchor, and the floor panel is formed. Any shape may be used as long as it is sandwiched and connected to the cross member.

  Further, the shape of the first floor reinforcement 3 and the hook 4 is not limited to the above-described embodiment. For example, in the above-described embodiment, the front end of the first floor reinforcement 3 extends to the first rear cross member 5. Although an example has been shown, the front end of the first floor reinforcement 3 does not necessarily extend to the first rear cross member 5.

DESCRIPTION OF SYMBOLS 1 ... Storage recessed part 2 ... Floor panel 3 ... 1st floor reinforcement 6 ... 1st floor reinforcement 6a ... Front-end part 7 ... 2nd rear cross member

Claims (1)

A rear floor panel in which a storage recess for the spare tire is formed, a floor reinforcement having a hat-shaped cross section disposed in a vehicle body front-rear direction on the bottom wall of the storage recess of the rear floor panel, and a traction attached to the floor reinforcement In the rear structure of the vehicle body including a hook and a cross member in the vehicle width direction disposed in front of the storage recess,
As the first floor reinforcement, the floor reinforcement on the bottom surface of the bottom wall of the storage recess,
A second floor reinforcement having a hat-shaped cross-section that is arranged in the vehicle front-rear direction so as to face the first floor reinforcement across the rear floor panel;
A vehicle body rear structure, wherein a front end portion of the second floor reinforcement is connected to the cross member serving also as a rear seat belt anchor.

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