JP2006096235A - Lower bodywork of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve attaching stiffness of a seat and/or a seat belt anchor, and improve supporting stiffness of a spare tire. <P>SOLUTION: A front side cross member 3 and a rear side cross member 4 are connected to each other by a vertical member 15, and a seat bracket 19 and the seat belt anchor 22 are attached to a connection or in proximity to the connection between the front side cross member 3 and the vertical member 15. Then a wire guide pipe 28 is provided on the undersurface of the vertical member 15, and the spare tire T is hoisted by a wire 30 extended toward a lower position passing through the one opening 28a of the pipe 28. Then the hoisted spare tire T is positioned by being seated at a concavity 8a of the front side cross member 3 and a concavity 11a of the center of the rear side cross member 4 in the vehicle width direction. Thus, the spare tire T is housed in a state of inclination in a forward-elevating manner. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lower body structure of an automobile capable of ensuring both the mounting rigidity of a seat and / or a seat belt anchor and the support rigidity of a spare tire.

In general, a seat and a seat belt anchor disposed in a vehicle are attached to a cross member of a vehicle body. However, Patent Document 1 discloses a first cross member positioned behind a seat, and the first cross member. A second cross member positioned at a distance from the rear side of the vehicle body is connected by a vertical member extending in the longitudinal direction of the vehicle body at the center of the vehicle body, and a seat bracket is attached to a connecting portion between the first cross member and the vertical member. At the same time, it is proposed to attach a seat belt anchor to the vertical member. According to the proposal of Patent Document 1, since the first and second cross members spaced apart from each other are connected by the vertical members, not only can the collision performance from the rear be improved, but also the seat and the seat belt Anchor mounting rigidity can be improved. The lower body structure disclosed in Patent Document 1 is suitable for a vehicle such as a one-box car.
Japanese Utility Model Publication No. 5-37661

  However, in the lower body structure disclosed in Patent Document 1, there is a longitudinal member extending in the longitudinal direction of the vehicle body between two cross members separated from each other in the longitudinal direction, so that a spare tire is stored on the floor panel. For this reason, there is a drawback that it is not possible to secure a space for the above.

  The present invention further develops the lower body structure disclosed in Patent Document 1, and provides a lower body structure for an automobile capable of improving the mounting rigidity of a seat and / or a seat belt anchor and ensuring the support rigidity of a spare tire. There is to do.

The invention of claim 1 includes a front cross member and a rear cross member separated from each other in the vehicle longitudinal direction at the rear of the seat,
A longitudinal member extending in the vehicle longitudinal direction at the vehicle width direction center portion between the front cross member and the rear cross member;
A seat bracket for attaching the seat to the vehicle body and / or a seat belt anchor of a seat belt for protecting an occupant seated on the seat is attached in the vicinity of a connecting portion between the front cross member and the vertical member;
The vertical member is provided with a mechanism for supporting a spare tire housed below the rear floor panel.

  According to a second aspect of the invention, on the premise of the first aspect of the invention, the spare tire is accommodated below the rear floor panel in a state of being suspended by a string-like tension member, and the string-like tension is accommodated in the vertical member. A guide pipe for guiding the member is attached via a bracket.

  The invention of claim 3 is based on the invention of claim 1 or 2, and the spare tire is housed below the rear floor panel in a state of being seated and positioned on the front cross member and the rear cross member, The rear cross member is joined to the rear end panel, and the downward projecting height of the front cross member is lower than the projecting height of the rear cross member downward, so that the spare tire is inclined forward. It is set as the structure accommodated in the downward direction of the said rear floor panel.

  According to a fourth aspect of the invention, on the premise of the invention of the third aspect, the rear end portion of the vertical member passes through the rear cross member, and the rear end of the vertical member is joined to the rear end panel. is there.

  According to a fifth aspect of the invention, on the premise of the fourth aspect of the invention, the rear cross member has a lower protruding height at the center portion in the vehicle width direction than a lower protruding height at the end portion in the vehicle width direction. Is a large configuration.

  According to the invention of claim 1, since the seat bracket and / or the seat belt anchor are attached in the vicinity of the connecting portion between the front cross member and the vertical member, both of which are rigid members, there is no need to provide other reinforcing members. The mounting rigidity of the spare tire can be ensured, and the mechanism for supporting the spare tire is arranged on the vertical member extending between the front and rear cross members, so that the supporting rigidity of the spare tire can be increased. it can.

  According to the invention of claim 2, when the spare tire is lifted by the string-like tension member and accommodated under the rear floor panel, the tensile load applied to the tension member is distributed from the vertical member to the front and rear cross members. The support rigidity of the tire can be increased.

  According to the third aspect of the present invention, the spare tire can be supported even when the distance between the front and rear cross members is smaller than the diameter of the spare tire, and the tensile load acting on the vertical member is shared with the rear end panel. Thus, it can be received by the rear cross member which forms a relatively large closed cross section. In addition to this, the rear cross member having a relatively large closed cross section is disposed adjacent to the rear end panel, so that the collision performance from the rear can be improved.

  According to the invention of claim 4, the rearward impact performance which is the effect of claim 3 can be further improved.

  According to the invention of claim 5, the operating device for operating the string-like tension member is disposed in the vicinity of the rear end panel at the end portion in the vehicle width direction where the rear cross member protrudes downwardly relatively low. Thus, the operability for lifting or lowering the spare tire can be improved.

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

  FIG. 1 is a perspective view of the lower vehicle body structure at the rear of the vehicle body as viewed obliquely from the rear. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a view of the lower body structure at the rear of the vehicle body as viewed from below. 1 and 4 are shown with the rear floor panel omitted.

  1 and 4 indicate a pair of left and right rear side frames extending in the longitudinal direction of the vehicle body on both sides of the vehicle body. Each rear side frame 1 has a hat-like cross section that is open upward, and has a rear floor. Create a closed cross-section with panel 2.

  Between the pair of left and right rear side frames 1 and 1, a front cross member 3 and a rear cross member 4 which are spaced apart from each other in the longitudinal direction of the vehicle body are disposed. The cross members 3 and 4 that are spaced apart from each other extend in the vehicle width direction, and the left and right ends thereof are respectively joined to the left and right rear side frames 1.

  The front cross member 3 is located along the rear edge of the rear seat 5 as a seat. As can be understood from FIGS. 2 and 3, the front cross member 3 has a hat-like cross section that is open upward, and includes a front wall 6, a rear wall 7, and a bottom wall 8.

  The rear cross member 4 is composed of a member having an L-shaped cross section, and includes a front wall 10 and a bottom wall 11, and a rear end panel 12 and a rear floor panel 2 at the rear end of the vehicle body form a closed cross section.

  Between the front cross member 3 and the rear cross member 4, a vertical member 15 extending in the vehicle front-rear direction at the center in the vehicle width direction is stretched. The vertical member 15 has a shape in which a central portion 15a bulges downward, and both end portions 15b and 15c in the longitudinal direction of the vehicle body and a side edge portion 15d in the vehicle width direction are constituted by flat flanges. The lower surface of the central bulging portion 15a is a flat surface.

  The front end flange portion 15b of the vertical member 15 is joined by welding while being sandwiched between the flange 7a of the rear wall 7 of the front cross member 3 and the rear floor panel 2 (FIGS. 2 and 3). On the other hand, the rear end flange portion 15c of the vertical member 15 is joined by welding while being sandwiched between the flange 10a of the front wall 10 of the rear cross member 4 and the rear floor panel 2 (FIGS. 2 and 3).

  The rear seat 5 has a pipe 5a extending in the vehicle width direction at the rear end thereof, and both ends and a center portion of the pipe 5a in the vehicle width direction are attached to the vehicle body via seat brackets 17 to 19 (FIG. 1). More specifically, the left and right seat brackets 17, 18 are arranged at the junction between the front cross member 3 and the left and right rear side frames 1, and the seat bracket 19 at the center in the vehicle width direction is connected to the front cross member 3. It is arranged at the junction with the vertical member 15. For example, as can be understood from FIGS. 1 and 2, the seat bracket 19 at the center in the vehicle width direction has bolts on the portion where the rear wall flange portion 7 a of the front cross member 3 and the front end flange portion 15 b of the vertical member 15 overlap. It is fixed using a nut 20. The same applies to the left and right seat brackets 17 and 18, and the front cross member 3 and the left and right rear side frames 1 are fixed to each other by using fasteners 20 made of a combination of bolts and nuts where the flange portions overlap each other. .

  Reference numeral 22 in FIGS. 1 and 3 indicates a buckle side seat belt anchor for the rear seat 5. The pair of left and right seat belt anchors 22 are disposed at the front end portions of the left and right side edge flange portions 15d of the vertical member 15, and the left and right seat belt anchors 22 are fixed by a fastener 23 comprising a combination of bolts and nuts.

  A tire suspension mechanism 26 for lifting the spare tire 25 is provided at the lower part of the rear part of the vehicle body (FIGS. 5 and 6). The tire suspension mechanism 26 has a bracket 27 having a U-shaped cross section joined to a longitudinal center portion of the longitudinal member 15, and a wire guide pipe 28 penetrating the side wall of the bracket 27 is welded to the bracket 27. ing. One end opening 28a of the wire guide pipe 28 is open downward (FIG. 7), and the other end of the wire guide pipe 28 extends to one end in the vehicle width direction of the rear cross member 4, and this rear cross The member 4 is connected to a wire winding operation device 29 fixed to one end portion in the vehicle width direction of the member 4 (FIG. 6). The wire winding operation device 29 has an operation rod 29a protruding upward, and the wire 30 can be wound or released by rotating the operation rod 29a. The wire 30 passes through the wire guide pipe 28 and extends downward from one end opening 28 a of the wire guide pipe 28, and a tire locking member 31 is attached to the free end of the wire 30.

  The tire locking member 31 includes two locking tools 32 and 33 on the upper side and the lower side, and the upper locking tool 32 has a plate-like long piece shape, and a circular bulging portion 32a is formed at the center thereof. A through hole 32b that is formed and through which the wire 30 can pass is provided at the center of the circular bulge 32a. The lower locking tool 33 has a size capable of entering the circular bulging portion 32 a of the upper locking tool 32, and one end of the wire 30 is connected to the central portion of the lower locking tool 33. Yes.

  In order to lift the spare tire T, with the wire 30 loosened, the upper and lower locking tools 32, 33 are inserted into the center hole 35 of the wheel of the spare tire T that is laid down, and then the wire hoisting operation device 29 is used. By winding up the wire 30, the upper locking tool 32 engages with the peripheral edge of the wheel center hole 35, and the lower locking tool 33 fits into the upper locking tool 32 to lift the spare tire T. it can.

  FIG. 5 shows a state in which the spare tire T is lifted and accommodated in the lower part of the rear vehicle body. The distance between the front cross member 3 and the rear cross member 4 is smaller than the diameter of the spare tire T, and the tire portion of the spare tire T abuts against the front cross member 3 and the rear cross member 4 and will be described later. Thus, it is accommodated in a state positioned by the front and rear cross members 3 and 4.

  The front cross member 3 is formed with a front recess 8a that is recessed upward in the center of the bottom wall 8 in the vehicle width direction, and the front recess 8a is opened rearward. On the other hand, the rear cross member 4 is formed such that the cross-sectional height of both end portions 4a in the vehicle width direction is lower than that in the center portion 4b in the vehicle width direction (FIG. 7). In other words, the amount of downward protrusion of the rear cross member 4 is smaller at both end portions 4a in the vehicle width direction than at the central portion 4b. A rear recess 11a that is recessed upward is formed at the center of the bottom wall 11 of the rear cross member 4 in the vehicle width direction, and the rear recess 11a is opened forward. .

  The spare tire T lifted by the wire 30 is positioned by receiving its front end in the front recess 8a and receiving its rear end in the rear recess 11a. That is, the front recess 8a and the rear recess 11a constitute a seating surface of the spare tire T that is lifted.

  As can be understood from FIG. 5, the protrusion height H1 downward of the front recess 8a is smaller than the protrusion height H2 downward of the rear recess 11a. Therefore, the spare tire T suspended by the wire 30 is accommodated in a state where it is inclined upward.

  In the above configuration, when the spare tire T is stored, the spare tire T is held not only by the front cross member 3 and the rear cross member 4 having the closed cross section but also by the vertical member 15 having the closed cross section. Is held under the rear floor panel 2 under high support rigidity. And the spare tire T is accommodated in the state positioned by the recess 8a of the front cross member 3 and the recess 11a of the rear cross member 4.

  Since the downward protrusion height H1 of the front recess 8a constituting the seating surface of the spare tire T is smaller than the protrusion height H2 of the rear recess 11a, the spare tire T is accommodated in a state where it is inclined forward. Therefore, for example, when the exhaust pipe EP is disposed in the vicinity of the front end of the spare tire T as shown by the phantom line in FIG. 5, interference between the spare tire T and the exhaust pipe EP is prevented. Can do. In addition to this, since the rear cross member 4 has a relatively large closed cross section, the rigidity of the vehicle body against a collision from the rear of the vehicle body can be improved.

  Further, since the rear cross member 4 is designed such that the vehicle width direction both ends 4a have a lower protruding height than the vehicle width direction central portion 4b, the wire winding operation device 29 is attached to the end 4a. Can be arranged. Therefore, by arranging the wire winding operation device 29 in the vicinity of the rear end panel 12, the operability of the wire winding operation device 29 can be improved.

  Further, since the seat brackets 17 to 19 are fixed to the overlapping portions of the front cross member 3, the rear side frame 1, and the vertical member 15 by the fastening member 20, the rear bracket 5 can be supported without providing other reinforcing members. Rigidity can be ensured. Similarly, since the seat belt anchor 22 is fixed to the side edge flange 15d of the vertical member 15, the support rigidity of the seat belt anchor 22 can be ensured without providing other reinforcing members.

  Further, regarding the storage of the spare tire T, the spare tire T is lifted by the hanging mechanism 26 fixed to the vertical member 15 connected to the front cross member 3 and the rear cross member 4 both of which are closed. The tensile load acting on the wire 30 can be distributed to the front and rear cross members 3 and 4.

  The embodiment of the present invention has been described above. However, the present invention is not limited to this. For example, as shown in FIG. 9, an extension 40 extending to the rear end panel 12 is provided at the rear end of the vertical member 15. The extension portion 40 may be disposed in a state of penetrating the rear cross member 4 so that the rear end of the extension portion 40 is joined to the rear end panel 12. According to this modification, the closed cross section formed by the extension portion 40 and the rear floor panel 2 is formed in the closed cross section of the rear cross member 4, so that the rear end of the vehicle body has a stronger structure. It is possible to improve the collision performance from the rear of the vehicle body. Of course, the extension 40 may extend to the rear end panel 12 while overlapping the rear floor panel 2.

It is the perspective view which looked at the lower body structure of the Example from diagonally upward. It is sectional drawing cut | disconnected along the II-II line | wire of FIG. It is sectional drawing cut | disconnected along the III-III line of FIG. It is the figure which looked at the lower body structure of an example from the lower part. FIG. 3 is an enlarged cross-sectional view taken along the line II-II in FIG. 1 as in FIG. 2. It is a figure for demonstrating the tire suspension mechanism for lifting a spare tire. FIG. 7 is a view for explaining a mechanism for lifting a spare tire, similar to FIG. 6. It is sectional drawing which cut | disconnected the rear side cross member in the longitudinal direction. It is a figure for demonstrating a modification.

Explanation of symbols

2 Rear floor panel 3 Front cross member 4 Rear cross member 4a Both end portions in the vehicle width direction of the rear cross member 4b Center portion in the vehicle width direction of the rear cross member 5 Rear seat 8a Front recess formed in the bottom wall of the front cross member H1 Projection height downward of the front recess 11a Rear recess formed in the bottom wall of the rear cross member H2 Projection height downward of the rear recess 12 Rear end panel 15 Vertical member 15a Center of the vertical member The bulging portion 15b The front end flange portion of the vertical member 15c The rear end flange portion of the vertical member 15d The side edge flange portion of the vertical member 17, 18 Both end seat brackets 19 Vehicle width direction center seat bracket 20 Bolt and nut for fixing the seat bracket (Fastener)
22 Seat belt anchors 23 Bolts and nuts (fasteners) for securing the seat belt anchors
DESCRIPTION OF SYMBOLS 25 Spare tire 26 Tire suspension mechanism 27 Bracket for tire lifting 28 Wire guide pipe 28a One end opening of a wire guide pipe 29 Wire winding operation apparatus 30 Wire 31 Tire locking member T Spare tire

Claims (5)

A front cross member and a rear cross member spaced apart in the longitudinal direction of the vehicle body behind the seat;
A longitudinal member extending in the vehicle longitudinal direction at the vehicle width direction center portion between the front cross member and the rear cross member;
A seat bracket for attaching the seat to the vehicle body and / or a seat belt anchor of a seat belt for protecting an occupant seated on the seat is attached in the vicinity of a connecting portion between the front cross member and the vertical member;
A lower body structure of an automobile, wherein the vertical member is provided with a mechanism for supporting a spare tire accommodated below the rear floor panel. The spare tire is accommodated below the rear floor panel in a state of being suspended by a string-like tension member,
The lower body structure of an automobile according to claim 1, wherein a guide pipe for guiding the string-like tension member is attached to the vertical member via a bracket. The spare tire is seated on the front cross member and the rear cross member and accommodated under the rear floor panel in a positioned state,
The rear cross member is joined to the rear end panel;
The lower protrusion height of the front cross member is lower than the lower protrusion height of the rear cross member, so that the spare tire is accommodated below the rear floor panel in a state of being inclined forward. The lower body structure of an automobile according to claim 1 or 2.   The lower body structure of an automobile according to claim 3, wherein a rear end portion of the vertical member passes through the rear cross member, and a rear end of the vertical member is joined to the rear end panel. The rear cross member has a protruding height below the central portion in the vehicle width direction that is higher than a protruding height below the end in the vehicle width direction.
The guide pipe extends to an end of the rear cross member in the vehicle width direction, and an operating device for operating the string-like tension member is disposed at the end of the rear cross member in the vehicle width direction. The lower body structure of an automobile according to claim 4.

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