JP2015214172A - Car body rear part structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a car body rear part structure of an automobile capable of suppressing displacement of a seat at the time of vehicle collision, without causing increase in cost and vehicle weight, and degradation in productivity.SOLUTION: In a case where, on a lower surface of a housing recess 4 formed at a rear floor panel 3, a plurality of reinforcing members 17, 18 extending along a front wall 6 from a bottom wall 4a of the housing recess 4 are jointed in a manner distributed about the center in a car width direction, a step part 6a protruding toward a front or rear part of a vehicle is formed between the reinforcing members 17, 18 of the front wall 6 of the housing recess 4, with ridges 6e, 6e' of the step part 6a close to the reinforcing members 17, 18.

Description

  The present invention relates to a rear structure of a vehicle body in which a container recess is formed in a rear floor panel.

  In general, a rear floor panel of an automobile is formed with a storage recess for storing a rear seat, a spare tire, and the like. In such a container recess, if the mold is formed excessively deep in order to increase the capacity, a problem occurs in moldability. For this reason, the rear floor panel may be divided to form a container recess, and then both may be joined by spot welding.

  However, since the rear floor panel is generally a thin plate, a reduction in rigidity due to deep molding is inevitable, and depending on the input at the time of the vehicle collision, there is a risk of spot welding peeling off. In order to prevent such a decrease in rigidity and spot welding peeling, for example, in Patent Documents 1 and 2, a plurality of reinforcing members are joined to the lower surface of the container recess.

  Usually, a seat lock member for fixing the rear seat is attached to the front portion of the rear portion of the storage compartment of the rear floor panel, and the rear seat floats upward in front of the vehicle due to a load from the seat belt at the time of the front crash. The reinforcing member is used to catch the rise.

JP 2011-46255 A JP 2008-56189 A

  By the way, in the said conventional structure, the deformation | transformation of the rear floor panel and a container recessed part by the load at the time of a vehicle collision may not be stabilized, and a collision load may not be effectively transmitted to a reinforcement member. As a result, spot welding peeling easily occurs on the vehicle member on the side of the seat lock member, and there is a concern that the rear seat is greatly displaced.

In order to prevent such spot welding peeling, it is conceivable to increase the thickness of the rear floor panel or the like. However, if this is done, there arises a problem that the cost and vehicle weight increase and productivity deteriorates.

  The present invention has been made in view of the above-described conventional situation, and provides a vehicle body rear structure that can suppress the displacement of a seat at the time of a vehicle collision without incurring an increase in cost, vehicle weight, or productivity. It is an issue.

According to the present invention, the rear floor panel is formed with a container recess, and at least a plurality of reinforcing members extending from the bottom wall of the container recess to the front wall are joined to the lower surface of the container recess by the center distribution in the vehicle width direction. In the rear structure of the vehicle body to which a rear seat fixing member is attached at the center in the vehicle width direction of the rear floor panel in front of the storage compartment,
A stepped portion having a convex shape is formed between the reinforcing members on the front wall of the container recess, and a ridge line of the stepped portion is brought close to the reinforcing member.

  According to the vehicle body rear structure according to the present invention, the convex stepped portion is formed between the reinforcing members on the front wall of the container recess provided in the rear floor panel, and the ridge line of the stepped portion is brought close to the reinforcing member. In addition, it is possible to transmit the tensile load in the obliquely forward direction of the vehicle input to the rear seat fixing member at the time of a vehicle collision to the adjacent reinforcing member at an effective timing. More specifically, the ridge line of the stepped portion is deformed so as to extend in the input direction by the tensile load, and the tensile load is transmitted to the reinforcing member. Therefore, the height of the stepped portion, the distance between the ridgeline and the reinforcing member, etc. By appropriately setting the load, the load can be transmitted to the reinforcing member at a target timing, and the rear seat can be prevented from being largely displaced by appropriately setting the load transmission timing.

That is, the present invention does not suppress deformation by increasing the rigidity of the container recess, but by arbitrarily setting the ridge line of the stepped portion that is easily deformed at the initial stage of the collision in the vicinity of the reinforcing member, The load is transmitted to the reinforcing member at the same timing, which is beneficial in terms of cost, weight reduction, and productivity improvement compared to the case where the thickness of the rear floor panel is increased to increase the rigidity. It is.

Further, in a normal state, the rigidity of the container recess can be increased by the ridge line of the stepped portion.

It is the perspective view seen from diagonally downward of the vehicle body rear part of the motor vehicle by Example 1 of this invention. It is the perspective view seen from the back diagonally upper part of the said vehicle body rear part. It is the perspective view seen from back rear upper direction in the state which cut the lower back panel of the said vehicle body rear part. FIG. 4 is a cross-sectional side view of the rear portion of the vehicle body (a cross-sectional view taken along line IV-IV in FIG. 2). FIG. 5 is a cross-sectional plan view (cross-sectional view taken along the line V-V in FIG. 4) of the rear portion of the vehicle body.

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

  1 to 5 are views for explaining a rear body structure of an automobile according to a first embodiment of the present invention. In the present embodiment, front, rear, left, and right mean front, rear, left, and right as viewed in the forward direction of the vehicle.

  In the figure, reference numeral 1 denotes a rear part of a vehicle body. The rear portion 1 of the vehicle body includes left and right rear side members 2 and 2 extending in the vehicle front-rear direction, a rear floor panel 3 coupled between the left and right rear side members 2, and the rear of the left and right rear side members 2. A lower back panel 5 is provided which is coupled between the end portions and forms a lower side portion of the back door opening 1a.

  The lower back panel 5 has a structure in which an outer panel 5a and an inner panel 5b are coupled so as to form a closed cross section, and a striker that locks a back door (not shown) at the center in the vehicle width direction of the lower back panel 5. 16 is attached.

  In the rear part of the rear floor panel 3, a container recess 4 is formed. The container recess 4 is connected to the rear end of the rear floor panel 3 and extends downward from the rear end. The bottom wall 4a and the bottom wall are formed separately from the front wall 6. 4a, left and right side walls 4b and 4b bent upwards following the left and right edges in the vehicle width direction, and a rear wall 5c formed by extending the inner panel 5b of the lower back panel 5 downward. It consists of

  An upper flange portion 6d bent at the upper end of the front wall 6 is joined to the rear end portion of the rear floor panel 3 by spot welding, and a lower flange portion 6b and left and right flange portions 6c bent at the lower end portion. , 6c are connected to the bottom wall 4a of the container recess 4 and the front edge portions of the left and right side walls 4b by spot welding, respectively, and the upper edge portions of the left and right side walls 4b are the left and right rear sides. The member 2 is joined by spot welding. Further, the lower end portion of the rear wall 5c is joined to the rear flange portion 4d bent at the rear end portion of the bottom wall 4a by spot welding.

  The rear floor panel 3 is formed with an inclined portion 3d that is inclined obliquely downward from the general surface 3 'to the front wall 3a. A lower cross member 8 and an upper cross member 9 extending in the vehicle width direction are disposed on the lower surface and the upper surface of the inclined portion 3d, respectively. The lower and upper cross members 8 and 9 are integrally joined with the inclined portion 3d by spot welding, and the left and right end portions of the lower cross member 8 are joined to the rear side member 2 by spot welding.

  The upper cross member 9 is disposed at the center in the vehicle width direction of the rear floor panel 3 in front of the storage compartment recess 4. A rear seat fixing member 14 that supports left and right rear seats 13 and 13 is attached to the upper cross member 9.

  The rear seat fixing member 14 engages and holds seat strikers 13a, 13a disposed on the rear lower surface of the left and right rear seats 13.

  Left and right first and second reinforcing members 17 and 18 and front and rear third and fourth reinforcing members 19 and 20 are disposed on the bottom surface of the storage compartment 4 on the outside of the vehicle. The first to fourth reinforcing members 17 to 20 have a hat shape in cross section, and the flange portions 17a to 20a thereof are coupled to the bottom surface of the container recess 4 by spot welding.

  The front and rear third and fourth reinforcing members 19 and 20 are disposed at the front end and the rear end of the bottom wall 4a of the container recess 4, respectively. The ends are coupled to the first and second reinforcing members 17 and 18.

  The left and right first and second reinforcing members 17 and 18 are arranged separately on the left and right so as to be symmetrical with respect to the vehicle center line. The first and second reinforcing members 17, 18 include bottom portions 17 ′, 18 ′ coupled to the lower surface of the bottom wall 4 a of the container recess 4, and a front portion 17 ″ coupled to the front surface of the front wall 6. , 18 ″. The front end portions of the first and second reinforcing members 17 and 18 are coupled to the lower cross member 8, and the rear end portions are coupled to the fourth reinforcing member 20.

  A stepped portion 6a having a convex shape in front of the vehicle is positioned between the front portions 17 ″ and 18 ″ of the first and second reinforcing members 17 and 18 on the front wall 6 of the storage compartment recess 4. Is formed. The left and right edge portions of the step portion 6a have ridge lines 6e and 6e ', and the ridge lines 6e and 6e' are the front portions 17 "and 18" of the first and second reinforcing members 17 and 18, respectively. It is located close to the inner edge and along the inner edge.

  According to the present embodiment, a step is provided so as to be positioned between the front portions 17 ″, 18 ″ of the first and second reinforcing members 17, 18 of the front wall 6 of the container recess 4 provided in the rear floor panel 3. Since the portion 6a is formed and the ridge lines 6e, 6e 'of the step portion 6a are positioned so as to be close to the front portions 17 ", 18", the vehicle obliquely inputted to the rear seat fixing member 14 at the time of a vehicle collision The front and upper tensile load can be transmitted to the first and second reinforcing members 17 and 18 at an effective timing to suppress the sheet displacement, thereby preventing spot welding peeling, and the rear seat 13 Large displacement can be suppressed.

More specifically, the ridgelines 6e and 6e 'of the step portion 6a are deformed so as to extend in the load acting direction due to a tensile load that is input to the rear seat fixing member when the vehicle collides, and then the ridgelines 6e, The load is transmitted to the first and second reinforcing members 17 and 18 adjacent to 6e '. Therefore, by appropriately setting the height of the stepped portion 6a or the distance between the ridges 6e and 6e ′ and the reinforcing member, the load can be transmitted at an effective timing for suppressing the displacement of the seat. As a result, spot welding peeling can be prevented, and consequently, the rear seat can be prevented from being greatly displaced.

In this way, the present embodiment does not suppress deformation by increasing the rigidity of the container recess 4 itself, and the ridges 6e and 6e 'of the stepped portion 6a that are easily deformed by a load in the initial stage of the collision are respectively provided to the reinforcing members 17 and 18. By setting so as to be close to each other, the load at the initial stage of the collision is efficiently transmitted to the left and right reinforcing members 17 and 18. As a result, the cost and weight can be reduced and productivity can be improved as compared to the case where the plate thickness of the rear floor panel or the like is increased to increase the rigidity.

  In this embodiment, since the lower cross member 8 is set below the rear seat fixing member 14 on the lower surface of the rear floor panel 3, the displacement of the rear seat 13 can be more reliably suppressed. That is, when the step portion 6 a is not set in the container recess 4, the sheet displacement load is not transmitted well to the reinforcing members 17 and 18 of the container recess 4, and as a result, most of the sheet displacement load is transferred to the lower cross member 8. There is a concern that spot welding peeling will easily occur near both sides of the lower cross member 8, and the deformation amount of the rear seat will increase.

  In this embodiment, the stepped portion 6a is formed on the front wall 6 of the container recess 4 so that the ridgelines 6e and 6e 'are located in the vicinity of the reinforcing members 17 and 18, and the collision load is applied to the lower cross member 8. Since the reinforcing members 17 and 18 can be held without delay, it is not necessary to add various reinforcing members or increase the thickness of the rear floor panel.

  In the present embodiment, since the first to fourth reinforcing members 17 to 20 are provided in the container recess 4, the rigidity of the entire rear floor panel can be increased when the container recess 4 is formed separately from the rear floor panel 3. And the input from the seat striker 13a can be received by the entire vehicle skeleton member.

Further, at the normal time, the rigidity of the container recess 4 can be increased by the ridge lines 6e and 6e 'of the step portion 6a.
In the above embodiment, the case where a pair of left and right reinforcing members are provided has been described. However, in the present invention, four or more reinforcing members may be provided, depending on the size, depth, etc. of the container recess. It will be set appropriately.

DESCRIPTION OF SYMBOLS 1 Car body rear part 3 Rear floor panel 4 Warehouse compartment recessed part 4a Bottom wall 6 Front wall 6a Step part 6e, 6e 'Ridge line 14 Rear seat fixing member 17, 18 Reinforcement member

Claims (1)

The rear floor panel is formed with a storage compartment recess,
A plurality of reinforcing members extending from the bottom wall of the container recess to the front wall are joined to the lower surface of the container recess by center distribution in the vehicle width direction,
In the rear structure of the vehicle body to which a rear seat fixing member is attached at the center in the vehicle width direction of the rear floor panel in front of the storage compartment,
A vehicle body rear portion of an automobile, wherein a stepped portion having a convex shape is formed between the reinforcing members on the front wall of the storage compartment recess, and a ridge line of the stepped portion is brought close to the reinforcing member. Construction.

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