JP2008105540A - Rear bodywork - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear bodywork capable of managing both improvement in rigidity and weight saving of a vehicle body by making a bulge structure supported in the vehicle body with high rigidity without causing a big increase in weight. <P>SOLUTION: An opening is formed in a rear floor panel, and it is blocked up by the bulge structure 8 swollen upwards. The side walls 9A-9D of the bulge structure 8 are formed by overlapping a plurality of hollow frames 10a-10c or 10d, 10e made of a material lighter than the rear floor panel in a line in a sectional direction. A hollow frame 11a extended from side to side in a width direction is provided in the upper wall 9E of the bulge structure 8. The lower parts of the right and left side walls 9A, 9B in the width direction of the bulge structure 8 are fixed in the rear frame 4 of the vehicle body. The hollow frame 11a of the upper wall 9E of the bulge structure 8 is engaged with a side support 18 extended from the side wall of the vehicle body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rear vehicle body structure including an upper bulging portion on a floor behind a seat in a vehicle interior.

  A vehicle is known in which a gas cylinder such as hydrogen gas or natural gas is mounted under the floor on the rear side of the rear seat (see, for example, Patent Document 1).

In the rear vehicle body of this type of vehicle, an upper bulging portion is formed on the floor panel behind the rear seat, and a gas cylinder supported by a frame member of the vehicle body is disposed below the upper bulging portion. The floor panel disposed behind the rear seat is supported and fixed to a pair of rear frames disposed along the front-rear direction of the vehicle body.
Japanese Patent Laid-Open No. 9-3000988

  However, in such a structure of the rear vehicle body, when the gas cylinder mounted on the vehicle is enlarged, the upper bulging portion formed on the floor panel has to be enlarged. It becomes difficult to form integrally with the floor panel.

  For this reason, currently, the upper bulging portion is configured as a bulge structure by joining a plurality of members, and it is considered to join this bulge structure to a floor panel. There is a concern that the rigidity of the rear frame that supports the floor panel from the lower side needs to be sufficiently increased, and the weight of the rear part of the vehicle body increases. In particular, since the rear frame arranged on the rear side of the rear seat has a curved portion that is curved three-dimensionally in the vehicle width direction and the vertical direction, a plurality of strength members are added to improve the rigidity of the curved portion. Must.

  Accordingly, the present invention provides a rear vehicle body structure that can support both the rigidity improvement and weight reduction of the vehicle body by allowing the bulge structure to be supported on the vehicle body with high rigidity without causing a significant increase in weight. It is something to be offered.

In the invention according to claim 1 for solving the above-described problem, an opening (for example, an opening 7 in an embodiment described later) is formed in a floor panel behind the seat (for example, a rear floor panel 5 in an embodiment described later). The opening is a rear vehicle body structure that is closed by a bulge structure that bulges upward (for example, a bulge structure 8 in an embodiment that will be described later). A side wall (for example, side walls 9A to 9D in an embodiment described later) and an upper wall (for example, an upper wall 9E in an embodiment described later) are provided, and at least a pair of opposite side walls of the bulge structure is formed from the floor panel. And a plurality of hollow frames made of a lightweight material (for example, hollow frames 10a to 10c in the embodiments described later) are formed in a row in a cross-sectional direction. A hollow frame (for example, a hollow frame 11a in an embodiment described later) is provided on the upper wall of the bulge structure, and the lower portions of the left and right side walls of the bulge structure It is fixed to a pair of rear frames (for example, the rear frame 4 in the embodiment described later) arranged along the front-rear direction, and the hollow frame on the upper wall of the bulge structure is a side wall of the vehicle body (for example, an embodiment described later). The rear pillar 17 is fixed to a side support (for example, a side support 18 in an embodiment described later).
As a result, the side wall of the bulge structure is formed with high rigidity by a plurality of lightweight hollow frames, and further, a hollow frame extending left and right in the width direction is provided on the upper wall of the bulge structure, and the hollow frame is a side support. The lower part of the side wall of the bulge structure is supported by the rear frame of the vehicle body. At this time, the bulge structure is supported by the side wall and the rear frame of the vehicle body, and the rear frame is also supported by the side wall of the vehicle body via the bulge structure and the side support.

According to a second aspect of the present invention, in the rear vehicle body structure according to the first aspect, a hollow frame on an upper wall of the bulge structure is disposed on the seat side.
Thereby, the hollow frame of the upper wall comes to be positioned from the vehicle front side of the bulge structure.

According to a third aspect of the present invention, in the rear vehicle body structure according to the first or second aspect, the left and right side walls of the bulge structure have a plurality of hollow frames made of a material lighter than the floor panel in cross section. It is formed by polymerizing in a line in the direction.
Thereby, the rigidity of the left and right side walls in the vehicle width direction of the bulge structure can be increased by the plurality of hollow frames, and the load in the longitudinal direction of the vehicle body can be received with high rigidity.

According to a fourth aspect of the present invention, in the rear vehicle body structure according to any one of the first to third aspects, the front and rear side walls of the bulge structure are a plurality of materials made of a material that is lighter than the floor panel. It is characterized by being formed by superposing hollow frames in a line in the cross-sectional direction.
Accordingly, the rigidity of the side walls in the front-rear direction of the bulge structure can be increased by the plurality of hollow frames, and the load in the vehicle body width direction can be received with high rigidity.

  According to a fifth aspect of the present invention, in the rear body structure according to any one of the first to fourth aspects, the hollow frame is formed by extruding a light metal.

  According to a sixth aspect of the present invention, in the rear vehicle body structure according to any one of the first to fourth aspects, the hollow frame is made of a carbon fiber reinforced resin and is made of a metal for bonding to the vehicle body side. The screw threading portion (for example, a nut 15 in an embodiment described later) is integrally provided.

According to a seventh aspect of the present invention, in the rear vehicle body structure according to any one of the first to sixth aspects, the lower portions of the left and right side walls of the bulge structure are mechanically coupled to the rear frame of the vehicle body. (For example, a bolt 13 in an embodiment described later) and an adhesive (for example, an adhesive in an embodiment described later) are fixed.
Accordingly, the lower portions of the left and right side walls in the width direction of the bulge structure are fixed to the rear frame by the mechanical coupling means and the adhesive, and are brought into close contact with the rear frame by the adhesive.

The invention according to claim 8 is the rear vehicle body structure according to any one of claims 1 to 7, wherein the side wall of the bulge structure superimposes a plurality of hollow frames in a row in a substantially vertical cross section. It is characterized by being formed.
Thereby, the extending direction of the hollow frame is along the side of the opening of the floor panel, and the rigidity is increased in the direction along the side of the opening.

A ninth aspect of the present invention is the rear vehicle body structure according to any one of the first to eighth aspects, wherein the hollow frame is disposed at an intersecting ridge line portion of the bulge structure. To do.
Thereby, the rigidity of the corner | angular part of a bulge structure increases.

According to the first aspect of the present invention, the side wall of the bulge structure is formed with high rigidity by the plurality of lightweight hollow frames, and the lightweight hollow frame provided on the upper wall of the bulge structure is connected to the vehicle body via the side support. Since the lower end of the side wall of the bulge structure is supported by the rear frame, the bulge structure can be supported on the vehicle body with high rigidity without causing a significant increase in weight, and The rigidity of the rear frame can be increased by the partition structure with the bulge structure and the side support. Therefore, according to the present invention, it is possible to achieve both improvement in the rigidity and weight reduction of the vehicle body.
In the present invention, since the opening is formed in the floor panel and the opening is closed with a separate bulge structure, the opening is used when electrodepositing the floor panel. The coating liquid can be circulated well. Therefore, according to the present invention, a so-called air pocket countermeasure at the time of painting becomes unnecessary, and the efficiency of the painting process can be improved.

  According to the second aspect of the present invention, since the hollow frame on the upper wall of the bulge structure is arranged on the seat side, the volume of the cargo compartment on the rear side of the vehicle body can be further increased, and at the rear portion of the seat The cross member that connects the left and right side walls of the vehicle body can be eliminated, or the vehicle can be further reduced in weight by further miniaturization.

  According to the invention described in claim 3, since the rigidity of the left and right side walls in the vehicle width direction of the bulge structure can be increased by the plurality of hollow frames, the deformation strength against the load input in the longitudinal direction of the vehicle body can be increased.

  According to the fourth aspect of the present invention, since the rigidity of the side walls in the front-rear direction of the bulge structure can be increased by the plurality of hollow frames, the deformation strength against load input in the vehicle body width direction can be increased.

  According to the invention described in claim 5, since the hollow frame can be easily formed by extrusion of light metal, the manufacturing cost of the bulge structure can be reduced.

  According to the invention described in claim 6, since the hollow frame is formed of carbon fiber reinforced resin and only the screw threaded portion for coupling to the vehicle body is formed of metal, the overall weight reduction can be further advantageously promoted. Can do.

  According to the invention described in claim 7, since the lower portions of the left and right side walls in the width direction of the bulge structure are fixed to the rear frame by the mechanical coupling means and the adhesive, and are adhered to the rear frame by the adhesive, The bulge structure and the rear frame can be firmly fixed, and the number of seal management locations around the bulge structure can be reduced to facilitate the vehicle body assembling work.

  According to invention of Claim 8, since a hollow frame will be arrange | positioned along the edge | side of the opening part of a floor panel, the deformation strength of an opening part can be raised.

  According to invention of Claim 9, since a hollow frame is arrange | positioned in the ridgeline part which a bulge structure cross | intersects, the rigidity of the corner | angular part of a bulge structure can be raised and deformation strength can be raised.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle unless otherwise specified. In the figure, the arrow FR indicates the front of the vehicle, and the arrow UP indicates the upper side of the vehicle.

FIG. 1 is an exploded perspective view of a main part of a vehicle employing a rear vehicle body structure according to the present invention. This vehicle is a fuel cell vehicle driven by a motor using a fuel cell (not shown) as a main power source, and hydrogen as a fuel gas and oxygen (air) as an oxidant gas are respectively contained in the fuel cell. 1 and an air compressor (not shown).
The hydrogen gas cylinder 1 is disposed below the floor behind the rear seat 2, and the air compressor is disposed in a motor room (not shown) in front of the driver seat.

  A pair of rear frames 4, 4 extending substantially in the longitudinal direction of the vehicle body is provided from below the rear seat 2 of the vehicle body to below the trunk room 3 at the rear of the vehicle body. A rear floor panel 5 is provided on the upper surface of the rear frames 4, 4. Is attached. More specifically, the rear frames 4 and 4 are arranged at the base side of the side sills 6 and 6 on the inner side of the vehicle body, and three-dimensionally from the base side toward the rear side of the vehicle body in the vehicle width direction and vertically upward. After curving, both are parallel and extend toward the lower surface side of the trunk room 3.

  A rear subframe (not shown) is attached below the rear frame 4, and the hydrogen gas cylinder 1 is supported and fixed to the rear subframe. The hydrogen gas cylinder 1 has a substantially cylindrical outer shape, and is attached to the rear subframe at the rear position of the rear seat 2 so that the axial direction is directed to the vehicle width direction.

  Further, a substantially rectangular opening 7 for avoiding interference with the hydrogen gas cylinder 1 is formed at a rear position of the rear seat 2 of the rear floor panel 5, and the opening 7 bulges above the rear floor panel 5. It is occluded by the structure 8.

  As shown in FIG. 2, the bulge structure 8 includes four side walls 9A to 9D on the front and rear and left and right sides of the vehicle body and an upper wall 9E, and is lighter than the rear floor panel 5 as a whole, for example, a light metal such as aluminum or magnesium. And carbon fiber reinforced resin (CFRP).

  The side walls 9A and 9B on the left and right sides of the vehicle body are arranged by superposing three hollow frames 10a, 10b, and 10c having a rectangular cross section extending in the longitudinal direction of the vehicle body in a line in a substantially vertical direction. Two hollow frames 10d and 10e having a square cross section extending in the left-right direction in the vehicle body width direction are superposed in a line in a substantially vertical direction. Although the detailed illustration of the side wall 9D at the rear part of the vehicle body is omitted, a plurality of hollow frames having a rectangular cross section extending in the vehicle body width direction left and right are superposed.

  When the hollow frames 10a to 10e are made of light metal, the hollow frames 10a to 10e are basically formed by extrusion, and the portion whose cross section changes in the longitudinal direction is appropriately combined with a press material. Adjacent hollow frames 10a to 10e are joined together by welding or welding. Moreover, when forming each hollow frame 10a-10e with a carbon fiber reinforced resin, it forms integrally by mold forming.

  The upper wall 9E is basically formed of a flat plate, and a hollow frame 11a having a rectangular cross section extending in the vehicle width direction only on the front end portion close to the rear seat 2 is superposed. The hollow frame 11a protrudes one step higher than the general surface of the upper wall 9E, and is formed continuously from the left end portion to the right end portion of the bulge structure 8. When the whole is made of light metal, the flat plate and the hollow frame 11a are joined by welding or welding, and when the whole is made of carbon fiber reinforced resin, they are joined by integral molding or adhesion.

  Further, joint flanges 12 are extended on the lower edges of the side walls 9A to 9D, and each joint flange 12 is coupled to the periphery of the opening 7 portion of the rear floor panel 5 by a plurality of bolts 13 (mechanical coupling means). Yes. However, the joining flanges 12 of the left and right side walls 9A and 9B are directly superposed on the inner side surface of the rear frame 4 in the vehicle width direction as shown in FIG. 3, and are fastened to the rear frame 4 and the rear floor panel 5 together in this state. In addition, the rear frame 4 is bonded with an adhesive 14. The adhesive 14 has a sealing property, and the side walls 9A and 9B and the rear frame 4 are sealed with the adhesive 14. The joining flange 12 may be fixed by riveting instead of fastening with the bolt 13. Moreover, you may make it adhere | attach between the joining flange 12 and the rear floor panel 5 of front and back side wall 9C, 9D with an adhesive agent further.

  As shown in FIG. 4, metal nuts 15 are provided inside both ends of the hollow frame 11a on the upper wall, and bolts are inserted at positions corresponding to the screw holes of the nut 15 on the front wall of the hollow frame 11a. A hole 16 is formed. On the other hand, a side support 18 that is a strength member having a stepped cross section is provided on the inner side of the left and right rear pillars 17 shown in FIG. The inner edge of each side support 18 in the vehicle width direction is superposed on the front surface of the hollow frame 11 a, and the superposed edge is joined by a bolt 20 using a bolt insertion hole 16 and a nut 15. The nut 15 provided in the hollow frame 11a is integrated by insert molding when the hollow frame 11a is formed of carbon fiber reinforced resin. In the case of this embodiment, as shown in FIG. 1, a cross member 19 having a stepped cross section is passed between the left and right rear pillars 17, 17 at a position directly above the bulge structure 8. The rigidity between 17 and 17 is improved. The cross member 19 may be integrally coupled to the left and right side supports 18 and 18.

  As described above, the bulge structure 8 that closes the opening 7 of the rear floor panel 5 includes a plurality of hollow frames 10a to 10c or 10d and 10e whose side walls 9A to 9D are made of light metal or carbon fiber reinforced resin in a row in a cross-sectional direction. Since it is formed by polymerization, high rigidity can be obtained without causing a significant increase in weight.

  In particular, in this embodiment, the side walls 9A and 9B on the left and right sides in the vehicle width direction are formed so that the extending direction of the hollow frames 10a to 10c is along the longitudinal direction of the vehicle body. The front and rear side walls 9C and 9D are formed so that the extending directions of the hollow frames 10d and 10e are along the vehicle body width direction, so that the load input from the vehicle width direction can be prevented. This is advantageous in terms of strength.

  Further, the left and right side walls 9A and 9B are opened because the plurality of hollow frames 10a to 10c are overlapped in a substantially vertical direction so that the extending direction is along the side of the opening 7 of the rear floor panel 5. The deformation of the portion 7 in the longitudinal direction of the vehicle body can be advantageously prevented. Similarly, the front side wall 9C has a plurality of hollow frames 10d and 10e that are superposed in a line in a substantially vertical direction so that the extending direction is along the front side of the opening 7 of the rear floor panel 5. The deformation of the portion 7 in the vehicle width direction can be advantageously prevented.

  Furthermore, since the hollow frames 10a and 10d are respectively disposed at the intersecting ridge lines of the upper portions of the left and right side walls 9A and 9B and the front side wall 9C, the rigidity of the corners of the bulge structure 8 is effectively increased. The bulge structure 8 can be prevented from being crushed and deformed.

  Here, in the bulge structure 8 described above, the lower ends of the left and right side walls 9A, 9B are fixed to the rear frames 4, 4, respectively, while the hollow frame 11a provided on the upper wall 9C extends to the left and right. Since these are coupled to the side supports 18 and 18 extending from the rear pillars 17 and 17, respectively, they are supported and fixed to the vehicle body with sufficiently high rigidity. Further, since the rear frames 4 and 4 are supported on the side wall of the vehicle body by the partition structure formed by the bulge structure 8 and the side supports 18 and 18, the rigidity of the rear frames 4 and 4 can be increased.

  Further, in this rear body structure, an opening 7 is formed in the rear floor panel 5 and a separate bulge structure 8 is attached to the opening 7 later, so that the rear floor panel 5 is opened during electrodeposition coating. The coating liquid can be circulated well every corner using the part 7. Therefore, when this structure is adopted, a so-called air pocket countermeasure at the time of electrodeposition coating becomes unnecessary, and the efficiency of the painting work is improved.

  Further, in this embodiment, since the hollow frame 11a that extends to the left and right in the vehicle body width direction is disposed on the rear seat 2 side (front end side) on the upper wall 9E of the bulge structure 8, the rear seat together with the side supports 18 and 18 is provided. The vehicle body rigidity of the back part of 2 can be increased effectively. Therefore, since the cross member 19 installed between the rear pillars 17 and 17 can be made sufficiently small in cross section and the cross member 19 can be eliminated in some cases, it is possible to contribute to weight reduction of the vehicle body. Furthermore, since the upward bulging portion by the hollow frame 11a is disposed on the front end side of the bulge structure 8, it is easy to secure a wider space in the trunk room 3 on the rear side of the vehicle body.

  By the way, when the hollow frames 10a to 10e and 11a of the bulge structure 8 are formed of a light metal such as aluminum or magnesium, most of these can be easily and efficiently manufactured by extrusion molding. The manufacturing cost of the body 8 can be reduced.

  When the hollow frames 10a to 10e and 11a are made of carbon fiber reinforced resin and the metal nut 15 for fastening to the side support 18 is insert-molded inside the hollow frame 11a, The weight of the entire 8 can be further reduced. And when using carbon fiber reinforced resin, the rigidity of the fixed direction (for example, longitudinal direction) of hollow frame 10a-10e, 11a can be more effectively improved by adjusting the direction of carbon fiber at the time of shaping | molding. it can.

  In this embodiment, the lower ends of the left and right side walls 9A and 9B of the bulge structure 8 are fixed to the rear frames 4 and 4 by the bolts 13 and fixed by the adhesive 14, so that the bulge structure is fixed by the adhesive 14. The airtightness between the rear frame 4 and the rear frame 4 can be improved, and the number of seal management points around the bulge structure 8 can be reduced. Therefore, when this structure is adopted, the assembly workability of the vehicle body can be improved.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the hollow frames 10a to 10c and 10d and 10e are provided in a row on the left and right side walls 9A and 9B and the front and rear side walls 9C and 9D of the bulge structure 8, respectively. You may make it provide a hollow frame only in a pair of side wall which opposes.

1 is an exploded perspective view of a rear portion of a vehicle body showing an embodiment of the present invention. The perspective view of the bulge structure of the embodiment. Sectional drawing corresponding to the AA cross section of FIG. 2 of the embodiment. Sectional drawing corresponding to the BB cross section of FIG. 2 of the embodiment.

Explanation of symbols

4 ... Rear frame 5 ... Rear floor panel (floor panel)
DESCRIPTION OF SYMBOLS 7 ... Opening part 8 ... Bulge structure 9A-9D ... Side wall 9E ... Upper wall 10a-10e, 11a ... Hollow frame 13 ... Bolt (mechanical coupling means)
14 ... Adhesive 15 ... Nut 17 ... Rear pillar 18 ... Side support

Claims (9)

An opening is formed in the floor panel behind the seat, and this opening is a rear vehicle body structure closed by a bulge structure that bulges upward,
The bulge structure comprises four side walls and an upper wall on the front and rear sides and the left and right sides of the vehicle body,
A pair of opposite side walls of the bulge structure is formed by superposing a plurality of hollow frames made of a material lighter than the floor panel in a row in a cross-sectional direction,
A hollow frame extending left and right in the width direction is provided on the upper wall of the bulge structure,
The lower portions of the left and right side walls in the width direction of the bulge structure are fixed to a pair of rear frames arranged along the front-rear direction of the vehicle body,
A rear vehicle body structure, wherein a hollow frame on an upper wall of the bulge structure is fixed to a side support extending from a side wall of the vehicle body.   The rear vehicle body structure according to claim 1, wherein a hollow frame on an upper wall of the bulge structure is disposed on the seat side.   The left and right side walls in the width direction of the bulge structure are formed by superposing a plurality of hollow frames made of a material lighter than the floor panel in a row in a cross-sectional direction. Rear car body structure described.   The side wall in the front-rear direction of the bulge structure is formed by superposing a plurality of hollow frames made of a material lighter than the floor panel in a row in a cross-sectional direction. The rear vehicle body structure according to claim 1.   The rear vehicle body structure according to any one of claims 1 to 4, wherein the hollow frame is formed by extruding a light metal.   5. The hollow frame is formed of a carbon fiber reinforced resin, and a metal screw threaded portion for coupling to the vehicle body side is integrally provided. Rear body structure described in 1.   The rear portion according to any one of claims 1 to 6, wherein lower portions of left and right side walls in the width direction of the bulge structure are fixed to a rear frame of a vehicle body with a mechanical coupling means and an adhesive. Body structure.   The rear vehicle body structure according to any one of claims 1 to 7, wherein the side wall of the bulge structure is formed by superposing a plurality of hollow frames in a row in a cross section in a substantially vertical direction.   The rear vehicle body structure according to any one of claims 1 to 8, wherein the hollow frame is arranged at a ridge line portion where the bulge structure intersects.

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