JPH01119480A - Body structure of automobile - Google Patents

Abstract

PURPOSE:To enhance the supporting rigidity of the whole vehicle body, in a vehicle body structure in which the vehicle body floor is formed by synthetic resins, by reinforcing the front body with a lower frame and an upper frame. CONSTITUTION:The under member 3 of a vehicle body 1 is formed by synthetic resins to form a floor part 2, and the lower part and the front part of the vehicle body are constituted by an under member 3 and an integrally manufactured front body 5. A frame member 6 extending in the front-and-rear direction of the vehicle body is fitted to the lower surface of the under member 3 so as to be extended up to the front body 5. The frame member 6 is branched at the dashboard 9 which partitions off the engine room from the cabin, to form a lower frame 6A and an upper frame 6B. The lower frame 6A functions as the support of the vehicle body, and the upper frame 6B has the function for enhancing the rigidity of the front body.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the body structure of an automobile, and more specifically, an under member constituting the floor of the vehicle body is formed of synthetic resin, and there is a structure in which an under member constituting the floor of the vehicle body is made of synthetic resin and extends from the rear of the vehicle body to the engine room. This invention relates to a vehicle body structure to which frame members are joined.

[Conventional technology]

Recently, in order to reduce the weight of a vehicle body and to simplify its manufacture, resin underbodies that are integrally molded into a part of the vehicle body structure have come to be used. A floor is formed on the underbody, and even when such a panel-shaped undermember is made of synthetic resin, a frame member extending in the longitudinal direction of the vehicle body is required. The frame member is directly joined to the lower surface of the under member, and also functions as a reinforcing material to increase the rigidity of the floor section, etc. Such a structure is, for example,
It is described in Japanese Patent No. 5269. There are two frame members on the left and right sides of the car that extend from the rear of the car to the engine room, and at the bottom of the engine room there are two front cross members, front and rear, to which the power unit, such as the engine, is attached. .

[Problem that the invention seeks to solve]

By the way, high rigidity is required to support the engine and suspension equipment, but if the front body that forms the engine compartment is also molded from resin, the frame attached to the under member mentioned above The reinforcing effect of the members alone is not sufficient, and it is necessary to separately strengthen or reinforce the front body. In order to attach the reinforcing material for this purpose, it is also necessary to secure a mounting space for the engine, and moreover, it is not easy to achieve the desired reinforcing effect.

The present invention was made in view of the above circumstances, and its purpose is to provide an automobile that can obtain high support rigidity for the power unit in the engine compartment, the suspension arm of the suspension device, etc. while improving the rigidity of the under member made of synthetic resin. The objective is to provide the following vehicle body structure.

[Means for solving problems]

The present invention is applicable to a vehicle body structure in which an under member including a floor portion of the vehicle body is formed of synthetic resin. Its characteristics are that a frame member that extends in the front-rear direction is joined to the lower surface of the floor part, and the front part of the frame member is branched from the dash panel part and consists of an upper frame and a lower frame, and the upper frame is connected to the engine room. The front end of the upper frame is formed to extend upward along the dash panel that partitions the cabin from the dash panel, and to the front from the upper end of the dash panel, and the front end of the upper frame extends forward from the dash panel. ,
It is attached to the front cross member.

[For production]

The under member of the vehicle body is molded from synthetic resin and has a floor portion, and the under member and the front body, which is manufactured integrally or separately, constitute the lower portion and front portion of the vehicle body. A frame member extending in the longitudinal direction of the vehicle body is attached to the lower surface of the under member and extends to the front body. The frame members are bifurcated at the dash panel part that separates the engine room and the cabin, and one side is located at the bottom of the engine room and forms the lower frame as described above, and the lower frame has front cross members in two places, front and rear. It is attached. The other side forms an upper frame and extends upward along the dash panel, and extends forward through the space within the engine room from its upper end.

And its front end, together with the front end of the lower frame,
It is attached to the front cross member. The lower frame functions to support the vehicle body, while the upper frame increases the rigidity of the front body. At the rear of the dash panel, the underside of the frame members has increased rigidity, and the underside and front body, which are molded from synthetic resin, have a strong structure.

〔Effect of the invention〕

According to the present invention, the rigidity of the under member is improved by the frame member attached to the lower surface thereof, and the rigidity of the front body is improved by the lower frame and the upper frame, and when the under member and the front body are molded from synthetic resin, the strength is insufficient. It is compensated for.

Of course, the frame members are located in the longitudinal direction of the vehicle body, and the upper frame is arranged three-dimensionally while reinforcing the dash panel part, which increases the support rigidity of the entire vehicle body, and the power unit and suspension arm can be attached to the lower frame. It also becomes easy to support a part of the power unit with the upper frame.

[Examples] The present invention will be described in detail below based on examples thereof. Figure 1 is an overall vertical cross-sectional view of the vehicle body 1, showing the floor portion 2.
An under member 3 provided with is made of synthetic resin and constitutes an under body.

The front body 5 forms the engine room 4.
consists of a wheel apron 5a and a shroud panel 5b, and is manufactured integrally with or separately from the underbody, but the underbody 3 constitutes the lower part and front part of the vehicle body, and can be easily manufactured by molding with synthetic resin. This makes it possible to reduce the weight of the vehicle body. The under member 3 has a panel shape, and a frame member 6 made of steel, CFRP, or the like is attached in the front-rear direction in order to support the synthetic resin vehicle body and to reinforce the floor portion 2.

As shown in FIG. 2(a), the under member 3 is formed with a hat-shaped rib 3a that opens downward, and a frame member 6 with a hat-shaped cross section that opens upward so as to close the rib 3a is formed on the under member 3. It may be directly joined to the lower surface of the member 3 by adhesive or the like, or it may be removably integrated with bolts or the like (not shown). This frame member 6 is designed to function not only as a support member for the vehicle body 1 but also as a reinforcing member to increase the rigidity of the floor portion 2 and the like. The thus formed closed cross section 7a extends in the front and back direction, one on each side of the vehicle body 1, and is located below the dash panel 9 that partitions the cabin 8 and the engine room 4, as shown in FIG. It is arranged to the front part of the front body 5 through.

Describing the structure of the frame member 6 in detail, as shown in FIG. One frame forms a lower frame 6A, the other forms an upper frame 6B, and is installed as described below. In front of the dash panel 9,
The frame member 6 becomes a lower frame 6A at an extended position of the main frame 6C, and its opening is closed with a plate member 10 as shown in FIG. 2(b), forming a closed cross section 7b continuous to the above-described closed cross section 7a. In the lower part of the engine room 4, as shown in FIG. 1, front cross members 11A and IIB are attached to the front and rear of the lower frame 6A with bolts or the like.

In this way, the lower frame 6A is integrated with the main frame 6C, and although it may be bent slightly upward, it extends almost forward and supports the entire vehicle body 1.

On the other hand, the upper frame 6B, which is formed to be branched from the lower frame 6A at the dash panel 9,
It extends upward along the dash panel 9, and extends forward through the space within the engine room 4 from its upper end. The front end of the upper frame 6B is connected to the front cross member 11A together with the front end of the lower frame 6A.
It is attached to the frame member 6 with bolts 23 or the like, and is integrated as a frame member 6. The portion of the dash panel 9 of the upper frame 6B forms a closed cross section together with the dash panel 9.

For this purpose, as shown in FIG. 4, the dash panel 9 is formed with a protrusion 12 having a hat-shaped cross section that locally protrudes toward the cabin 8, and the lower part of the protrusion 12 has a hat-shaped rib 3a forming a closed cross section 7a. (See Fig. 1) A tunnel portion 12a is provided that covers the tunnel portion 12a.The protrusion 12 is inclined so that the amount of protrusion decreases as it goes upward. 6a (see FIG. 1) is backed.An upper frame 6B having a hat-shaped cross section forming a closed cross section 7c as shown in FIG. 2(C) is glued to the dash panel 9,
Although it is not directly connected to the main frame 6C,
As shown in the figure, the main frame 6
C and bolts 13 [see FIG. 2(d)], etc., and the frame member 6 becomes an integral body composed of a lower frame 6A, an upper frame 6B, and a main frame 6C, and functions as the frame of the vehicle body 1. do.

The front extension part 6b (see Fig. 1) of the upper frame 6B is integrated so as to cover the above-mentioned vertical part 6a, but its hat-shaped cross section is opened downward, and the plate material 14 is glued to the lower surface. As a result, a closed cross section 7d as shown in FIG. 2(e) is formed.Incidentally, in this example,
The upper frame 6B has an outwardly projecting face plate portion 15 and a side wall inner portion 16 integrally molded in advance, so that the upper frame 6B is integrated with the front body 5.

As mentioned above, since the upper frame 6B is attached to the front cross member 11A together with the lower frame 6A, the lower frame not only supports the vehicle body 1, but also supports the closed section 17 formed by the upper frame 6B when viewed from the side. [See FIG. 3], the rigidity of the front body 5 is increased. At the rear of the dash panel 9, the main frame 6C increases the rigidity of the floor part 2 of the under member 3, creating a strong structure that integrates the under member 3 and the front body 5, which are molded from synthetic resin. Ru.

As shown in FIG. 5, a power unit 18 and a suspension arm 19 of a suspension device are mounted and attached to the front body 5 reinforced with the upper frame 6B with desired mounting strength. That is, the front cross member 11A.

For example, the horizontal engine 18 is attached to the engine mount members 2OA and 20B on the lower frame 6A to which the engine 11B is passed.
The suspension arm 19 is mounted on the wheel 2 via the
It is installed so that it extends toward the construction. On the other hand, as shown in FIG. 6, the upper frame 6B is formed with a support portion 22 for holding the upper half of the engine 18, thereby reliably supporting the power unit 18.

Note that the lower frame 6A and the upper frame 6B are the same as the main frame 6C when viewed from above as shown in FIG.
However, only the main frame 6C may be located inward as shown by the imaginary line in FIG. In that case, the vertical portion 6a of the upper frame 6B
Although a horizontal portion 6C connecting the upper end and the rear end of the front extension 6b is provided, it may be formed integrally with the front extension 6b. In addition, in the case of a vertically mounted engine, etc., leave the main frame 6C at the position indicated by the solid line and lower frame 6C.
Either one or both of A and the upper frame 6B may be located inward. In this way, the arrangement of the frame member 6 and the lower frame 6A and upper frame 6B connected thereto will be appropriately selected depending on the structure of the vehicle body 1 and the equipment to be mounted, but in any case, it is important that they are integrated with each other. As a result, it functions as a frame member of the vehicle body 1. Therefore, the height position of the upper frame 6B and the shape of its front extension 6b are taken into consideration so that the front body 5 can have sufficient rigidity and the power unit 18 can be mounted thereon.

According to the automobile body structure as described above, the under member 3 is reinforced by the frame member 6, particularly the main frame 6C, attached to the lower surface thereof, and the rigidity of the front body is improved by the lower frame 6A and the upper frame 6B. Therefore, even if the under member 3 and the front body 5 are not strong enough when molded from synthetic resin, their strength can be increased. Frame member 6
are located in the longitudinal direction of the vehicle body, and the upper frame 6B is three-dimensionally arranged while reinforcing the dash panel 9, thereby increasing the supporting rigidity of the entire vehicle body. Moreover, the power unit 18 and suspension arm 19 in the front body
Installation also increases rigidity.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the body structure of an automobile according to the present invention, FIG. 2(a) is a cross-sectional view taken along line nn in FIG.
Figure (b) is a cross-sectional view taken along the line m-m in Figure 1, Figure 2 (c) is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 2 (d) is a cross-sectional view taken along the V-V line arrow sectional view, Figure 2 (
e) is a sectional view taken along the line Vl-Vl in Fig. 1, Fig. 3 is a perspective view of the vehicle body mounting structure for frame members consisting of the main frame, lower frame, and upper frame, and Fig. 4 is a perspective view of the dash panel section. , FIG. 5 is a plan view of the right half of the front body showing how the power unit and suspension arm are mounted and attached, and FIG. 6 is a view taken along the line ■-■ in FIG. 5. 1 - Vehicle body, 2 - Floor part, 3 - Under member, 6 - Frame member, 68 - Lower frame, 6B - Upper frame, 9 - Dash panel, 11A - Front cross member, 18 - Power unit lift (engine )
, 22... Support part. Patent applicant Mazda Corporation Agent Patent attorney Katsutoshi Yoshiso (one person) Figure 2 (a) Figure 2 (b) Figure 2 p (d) Figure 2 (C) Figure 2 (e) Figure 6

Claims (2)

[Claims] (1) An under member with a floor part of the vehicle body is formed of synthetic resin, and a frame member extending in the longitudinal direction is joined to the lower surface of the floor part, and the front part of the frame member branches off from the dash panel part. The upper frame is formed to extend upward along a dash panel that partitions the engine room and the cabin, and extends forward from its upper end. A front end of the lower frame is attached to a front cross member together with a front end of the lower frame extending forward from the dash panel. (2) The automobile body structure according to claim 1, wherein the upper frame is formed with a support portion to which a power unit is attached.