JPS63247176A - Lower part body structure of vehicle - Google Patents

Abstract

PURPOSE:To increase the strength of each connecting part and a vehicle room front end part by specifying the connecting relation of each of component parts which form the lower part body structure of a vehicle and forming a closed section on the connecting part between the front end part of a floor frame and a front side frame. CONSTITUTION:A dash lower panel 1 which forms a partition wall toward an engine room is erected on the front end part of a vehicle room while a floor panel 2 is connected to its lower end part. In this case, one end part of the floor panel 2 is formed into a projecting part 2b which is directed obliquely upward and a front side frame 3 is connected to this projecting part 2b. And, a floor frame 4 is connected to the top face side of the projecting part 2b, thereby, connecting the frames 3, 4 via the floor panel 2. Also, a dash lower member 5 is inclinedly installed between the floor panel 2 and the dash lower panel 1 by connecting the flange parts 5a on its upper and lower end parts to the panels 1, 2 respectively, to form a closed section 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lower vehicle body structure for a vehicle that takes into consideration a reduction in air resistance on the lower surface side of the vehicle body.

[Conventional technology]

For example, in the lower body structure of conventional vehicles,
There is a structure shown in Japanese Patent No. 8073, in which a front side frame extending from the front side of the vehicle is connected to a flat part of a darts lower panel, and a floor, which is a reinforcing member, is attached to the lower surface of this darts lower panel. It is constructed by continuously connecting frames.

[Problem that the invention seeks to solve]

However, if the floor frame is simply installed on the top of the floor panel in order to reduce air resistance on the lower side of the vehicle body, the lower panel will be interposed between the front side frame and the floor frame, causing collisions. This poses a problem in that the load tends to be concentrated on the dash panel, and the interior space of the vehicle shrinks due to the deformation of the dash panel.

[Means for solving problems]

In order to solve the above-mentioned problems, the lower body structure of a vehicle of the present invention includes a darts lower panel that forms a partition between the passenger compartment and the engine room, and a darts lower panel that is connected to the darts lower panel,
A darts lower member, whose upper end is connected to the darts lower panel and whose lower end is connected to the floor panel, is installed between the floor panel that forms the floor of the vehicle interior to form a closed section extending in the width direction of the vehicle body. On the other hand, on the floor panel, a floor frame whose front end is provided within the closed cross section is installed extending toward the rear of the vehicle body, and a floor frame is installed extending from the front end of the floor frame and from the front side of the vehicle. The rear end portion of the front side frame is connected to the rear end portion of the front side frame through a panel interposed between the two.

[For production]

In the above configuration, the front end of the floor frame and the rear end of the front side frame are connected through a panel interposed between them, and the connection part with the front side frame at the front end of the floor frame By forming a closed cross section, the strength of the connection part and the front end of the passenger compartment is increased, and the rearward protrusion of the front side frame is suppressed in the event of a frontal collision. It is possible to prevent the vehicle interior space from shrinking due to deformation of the panel interposed between the front side frame and the front side frame.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

A darts lower panel 1 that forms a partition wall from the engine room is suspended from the front end of a vehicle interior of an automobile, and a floor panel 2 that forms the floor of the vehicle interior is connected to the lower end of this darts lower panel 1. ing. The floor panel 2 has a front end bent diagonally upward, and an upper end bent vertically upward to form a flange 2a, which is connected to the darts lower panel 1. Further, a connecting portion of the floor panel 2 with a front side frame 3, which will be described later, is a diagonally upwardly protruding portion 2b. A front side frame 3, which is a rigid member extending from the engine room side to the passenger compartment side on both left and right sides of the vehicle body, is connected to this protruding portion 2b. This front side frame 3 is inclined so that its rear end comes into contact with the front end surface of the floor panel 2,
While connected to the floor panel 2 at the flange portion 3a,
The lower part of the rear end slightly expands downward and is disposed on the lower surface side of the floor panel 2.

A floor panel 2
A hunt-shaped floor frame 4 provided above is connected. The floor frame 4 has a height lower than the upper end of the protruding portion 2b, is slightly different in height from the front side frame 3 in the vertical direction, and is linear with the front side frame 3 in the longitudinal direction, so that It extends toward the rear. The front end of the floor frame 4 connected to the protrusion 2b is overlapped and welded to cover the upper side and back side of the protrusion 2b from above. Thereby, the front side frame 3 and the floor frame 4 are connected via the floor panel 2 interposed between them.

Between the floor panel 2 and the darts lower panel 1, the upper end flange 5a is connected to the floor panel 2, and the lower end flange 5a is connected to the darts lower panel 1, so that the darts lower member 5 is installed in an inclined manner. Both ends of the darts lower member 5 in the width direction are connected to the side sill 7 and the front pillar 8 to improve the strength of each of these members. A closed cross section 6 is formed by the darts lower panel 1, the floor panel 2, and the darts lower member 5.

In the above structure, in the lower vehicle body structure, the floor frame 4 is provided on the vehicle interior side, thereby reducing unevenness on the vehicle lower surface side and reducing air resistance.

On the other hand, when a car collides from the front, an impact force is applied to the front side frame 3. Although some of this impact force is absorbed by the front side frame 3 bending, etc., the front side frame 3 has a floor panel. A force is applied that tries to break through 2 and move into the vehicle interior. However, since the floor frame 4 is connected to the rear end of the front side frame 3 via the floor panel 2, the front side frame 3
Protrusion into the vehicle interior is suppressed. Further, at the front end of the floor frame 4 connected to the front side frame 3, a closed section 6 is formed by the darts lower panel 1, the floor panel 2, and the darts lower member 5. The connection portion with the side frame 3 and the front end portion of the vehicle compartment have high strength.

〔Effect of the invention〕

As described above, the lower body structure of the vehicle of the present invention includes a darts lower panel that forms a partition between the passenger compartment and the engine room;
A darts lower member, whose upper end is connected to the darts lower panel and whose lower end is connected to the floor panel, is installed between this darts lower panel and the floor panel that forms the floor of the vehicle interior. While forming a closed cross section extending in the width direction, a floor frame is provided on the floor panel, the front end of which is provided within the closed cross section, extending in the rear direction of the vehicle body, and the front end of the floor frame and The rear end portion of the front side frame extending from the front side of the vehicle is connected to the rear end portion of the front side frame through a panel interposed between the two.

As described above, by forming a closed cross section at the connection portion of the floor frame with the front side frame, it is possible to improve the strength of the connection portion between the two and the front portion of the vehicle interior. Further, it is possible to prevent the vehicle interior space from shrinking due to deformation of the panel interposed between the floor frame and the front side frame. Therefore, even if the vehicle collides head-on, the front side frame can be prevented from protruding toward the vehicle interior, and safety can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is an end view taken along the line B-B in FIG. be. 1 is a darts lower panel, 2 is a floor panel, 2b is a protrusion, 3 is a front side frame, 4 is a floor frame, 5 is a darts lower member, and 6 is a closed cross section.

Claims (1)

[Claims] 1. Between the dash lower panel that forms the partition between the vehicle interior and the engine room, and the floor panel that is connected to this dash lower panel and forms the floor of the vehicle interior, the upper end is connected to the dash lower panel and the lower end is the floor panel. A dash lower member is installed to form a closed cross section extending in the width direction of the vehicle body, while a floor frame whose front end is provided within the closed cross section is installed on the floor panel and extends toward the rear of the vehicle body. The front end of the floor frame and the rear end of the front side frame extending from the front side of the vehicle are connected via a panel interposed between the two. The lower body structure of the vehicle.