JPH0347979Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the lower body structure of an automobile, and particularly relates to an improvement in the mounting structure of a cross member extending in the vehicle width direction arranged on the upper surface of a floor panel.

(Prior Art) Conventionally, as a lower body structure of an automobile, for example, as disclosed in Japanese Utility Model Application Publication No. 55-94280, an end portion of a cross member extending in the vehicle width direction arranged on the upper surface of a floor panel has been used. is fixed to the side sill, and the vicinity of the part of the cross member that is fixed to the side sill is raised upward to be higher than the side sill, and the upper end of the raised part of the cross member and the lower end of the side sill overlap in the height direction, thereby preventing a side collision. It is known that the rising portion of the cross member prevents the side door from entering the room.

(Problem to be solved by the invention) However, in the above-described cross member, the cross member is only fixed to the side sill at both ends, so it is difficult to cross load in the vehicle width direction such as the impact load due to a side collision. It is difficult to effectively distribute it to the side bodies on both sides through the members,
The strength and rigidity in the vehicle width direction were insufficient.

In addition, the reason why the part of the cross member where it is attached to the side sill stands upward and is higher than the side sill is to prevent the side door from entering the interior in the event of a side collision, and to increase the strength and rigidity in the vehicle width direction. Increasing this did not make much of a contribution.

The present invention has been made in view of the above points, and its purpose is to improve the mounting structure of the cross member and to improve the strength and rigidity of the cross member in the vehicle width direction. It is in.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is such that a cross member extending in the vehicle width direction and forming a closed cross section is disposed on the upper surface of the floor panel. , side frames extending in the longitudinal direction of the vehicle body are disposed on both sides of the floor panel at approximately the same height as the upper surface of the side sill. The above-mentioned cross member includes a lower cross member having a generally hat-shaped cross section joined to the upper surface of the floor panel, and a lower cross member having a roughly U-shaped cross section crowned above the lower cross member and joined to both sides of the lower cross member. It is made up of Atsupakros members. Both ends of the lower cross member are joined to the side frame, and both ends of the upper cross member are joined to the vehicle body wall constituting the passenger compartment at a position higher than the upper surface of the side sill.

(Function) With the above configuration, in the present invention, the cross member that forms a closed cross section and extends in the vehicle width direction has a two-stage structure of the lower cross member and the upper cross member, and both ends of the lower cross member are referred to as the upper surface of the side sill. Since it is connected to the side frame of the same height, and both ends of the Atsupa cross member are connected in the vehicle width direction at a position higher than the top surface of the side sill, the above two-stage structure improves the strength and rigidity of the cross member itself, and also improves the strength and rigidity of the cross member at both ends. The joints of the parts are strengthened. Furthermore, the lower cross member and the upper cross member effectively improve the rigidity in the vehicle width direction at the height of the side sill and the rigidity in the vehicle width direction above the side sill. Therefore, the load in the vehicle width direction can be distributed to the side members on both sides via the cross member, and the strength and rigidity in the vehicle width direction are greatly improved.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a lower body structure of an automobile according to an embodiment of the present invention, in which 1 is a front floor panel constituting the floor of a vehicle interior, and 2 is a front floor panel that slopes diagonally rearward and upward from the rear end of the front floor panel 1. An inclined panel 3 is a rear floor panel extending from the inclined panel 2 toward the rear of the vehicle body. Above front floor panel 1, inclined panel 2 and rear floor panel 3
The floor panel 4 of the vehicle body is comprised of these.

Further, 5 is a side body that constitutes a side wall of the vehicle body. The side body 5 is shown in FIGS. 2 and 3.
As shown in the figure, a closed space 8 is formed inside by a cab side panel 6 and an outer fender 7, which serve as a vehicle interior wall constituting a vehicle interior. In the lower part of the closed space 8, a side sill 9 forms a closed section with the cab side panel 6 and extends in the longitudinal direction of the vehicle body.

Further, on both sides of the floor panel 4, side frames 10 extending in the longitudinal direction of the vehicle body are disposed at substantially the same height as the upper surface of the side sill 9.
The side frame 10 forms a closed cross section with the cab side panel 6 at both ends of the front floor panel 1, and the side frame 10 forms a closed cross section with the cab side panel 6 at both ends of the front floor panel 1, and on both sides of the inclined panel 2 and rear floor panel 3, the side frame 10 is connected to the inside of the vehicle body at a position corresponding to the rear wheel. It forms a closed cross section with the tire house 11 which bulges out in a curved shape.

In addition, a cross member 12 that forms a closed cross section with the front floor panel 1 is disposed on the upper surface of the rear end of the front floor panel 1 so as to extend in the vehicle width direction. The upper surface of the cross member 12 and the upper surface of the rear floor panel 3 are connected to the rear side frame 13 disposed above the side frame 10.
They are connected so that they are flush with each other. As shown in FIG. 4, the rear side frame 13 forms a closed cross section with the rear tire house 11 and the side frame 10 and extends in the longitudinal direction of the vehicle body.

As a feature of the present invention, as shown in FIG. 5, the cross member 12 has flanges 14, 14 at both lower ends, and is joined to the upper surface of the front floor panel 1 by the flanges 14, 14. The lower cross member 15 has a substantially hat-shaped cross section, and a top cross member 16 has a substantially U-shaped cross section and is attached above the lower cross member 15 and joined to both sides of the lower cross member 15. There is.
The lower cross member 15 is the side frame 1
flanges 17 provided at the same height position as the 0 and side sills 9 and formed at both ends in the vehicle width direction;
is joined to the side frame 10. on the other hand,
The atsupak cross member 16 is provided at a higher position than the side frame 10 and the side sill 9, and the flanges 18 formed at both ends in the vehicle width direction are the cab side panels 6 serving as vehicle interior walls constituting the vehicle compartment. is joined to.

In FIG. 1, reference numeral 19 denotes a reinforcing member that connects the cross member 12 and the rear floor panel 3. The spare tire 20 is placed on the rear floor panel 3 from the reinforcing member 19, and is secured by the mounting bolts 21. The spare tire 20 is firmly fixed and stored. Further, 22 is a cover that covers the upper part of the spare tire 20.

Further, reference numeral 23 denotes reinforcements that are erected upward from the upper surface of both end portions of the cross member 12. The reinforcement 23 has its lower end on the upper surface of the cross member 12 on the front side of the vehicle body.
They are respectively joined to the tire houses 11 on the rear side of the vehicle body.

Furthermore, a rear deck 24 extends in the vehicle width direction above the rear floor panel 3 and has both ends joined to the upper end of the side body 5 of the vehicle body, and a rain 25 connects both side ends of the rear deck 24 and the tire house 11. 26 is a suspension tower projecting inward from the tire house 11, and 27 is a trunk lid that covers the upper part of the trunk room.

Therefore, in the above embodiment, the cross member 12 extending in the vehicle width direction has a two-stage structure consisting of the lower cross member 15 and the upper cross member 16, and both ends of the lower cross member 15 are approximately connected to the upper surface of the side sill 9. Since it is joined to the side frame 10 at the same height, and both ends of the upper cross member 16 are joined to the cab side panel 6 at a position higher than the upper surface of the side sill 9, the lower cross member 1
5 improves the rigidity in the vehicle width direction at the height of the side sill 9, and the upper cross member 16 effectively improves the rigidity in the vehicle width direction above the side sill 9. Therefore, even if a large load is applied in the vehicle width direction, the load is distributed to the side bodies 5 on both sides via the lower cross member 15 and upper cross member 16, and the strength and rigidity against the load in the vehicle width direction are greatly increased. improves.

Moreover, since the cross member 12 (Atsupa cross member 16) and the rear floor panel 3 are connected by the rear side frame 13 which is joined to the tire house 11 at the side, strength and rigidity in the longitudinal direction of the vehicle body are improved. In addition, the load in the vehicle width direction is transferred to the side body 5 by the rear side frame 13 via the tire house 11.
The strength and rigidity against loads in the vehicle width direction are further improved.

Further, the cross member 12 has a two-stage structure composed of a lower cross member 15 and an upper cross member 16, and both ends of the lower cross member 15 are joined to the side frame 10, and the upper cross member 16 is connected to the side frame 10. Since both ends are joined to the cab side panel 6, the strength and rigidity of the cross member 12 itself are improved, and the joints at both ends of the cross member 12 are further strengthened, and as a result,
Strength and rigidity in the vehicle width direction are further improved.

Furthermore, each end of the cross member 12 (upper cross member 16) is connected to the cab side panels 6, 6 arranged on both sides of the vehicle body, so that the strength of the cab side panel 6 itself is increased. Rigidity is also improved.

(Effects of the invention) As described above, in the present invention, the cross member extending in the vehicle width direction arranged on the upper surface of the floor panel has a two-stage structure of the lower cross member and the upper cross member, and the lower cross member provides side shields. Atsupa cross members effectively improve the rigidity in the vehicle width direction above the side sills, so the load in the vehicle width direction is transferred to both side bodies through each cross member. This improves the strength and rigidity in the vehicle width direction. Moreover, the two-stage structure of the lower cross member and the upper cross member improves the strength and rigidity of the cross member itself, and strengthens the joints at both ends of the cross member, further improving the strength and rigidity in the vehicle width direction. There are advantages to doing so.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view showing the lower vehicle body, Fig. 2 is an enlarged perspective view of the main part, Fig. 3 is a cross-sectional view taken along the line - - of Fig. 2, Fig. 4 and Fig. 5 is a sectional view taken along the - line and - line in FIG. 1, respectively. 4... Floor panel, 6... Cab side panel, 9... Side sill, 10... Side frame, 12... Cross member, 15... Lower cross member, 16... Atsupa cross member.

Claims (1)

[Claim for Utility Model Registration] A cross member extending in the vehicle width direction and forming a closed cross section is disposed on the upper surface of the floor panel, and side frames extending in the longitudinal direction of the vehicle body are provided on both sides of the floor panel on the upper surface of the side sill. The cross member is located at approximately the same height as the lower cross member, which is connected to the top surface of the floor panel and has a roughly hat-shaped cross section;
The upper cross member has a substantially U-shaped cross section and is mounted above the lower cross member and is joined to both sides of the lower cross member. Both ends of the lower cross member are joined to the side frame. A lower vehicle body structure for an automobile, wherein both ends of the atsupaka cross member are joined to a vehicle interior wall constituting a vehicle interior at a position higher than the upper surface of the side sill.