JPH0775992B2 - Car floor structure - Google Patents

Description

The present invention relates to a floor structure of an automobile.

(Prior Art) In a vehicle floor panel, a bead portion that extends in the vehicle width direction and bulges upward is generally formed in order to enhance the synthesis thereof, particularly from the viewpoint of preventing vibration (actually, See Kaisho 60-145975).

It is also common practice to join a vehicle body frame (generally, a pair of left and right side frames) to the lower surface of the floor panel so as to increase the rigidity of the floor portion of the automobile as a whole. The body frame has a pair of left and right joint flange portions, and the floor panel and the body frame are joined (generally spot welded) at the joint flange portions.

(Problems to be Solved by the Invention) By the way, as one condition for increasing the rigidity of the floor portion, it is important to increase the joint strength between the floor panel and the vehicle body frame. For this purpose, the number of joints should be increased. Is desired. On the other hand, as a condition for preventing vibration transmission from the vehicle body frame to the floor panel, it is desirable that the pitch of the bead portions formed on the floor panel be long in the front-rear direction.

Since the bead portion bulges upward, the two conditions described above conflict with each other in that the existing portion of the bead portion cannot be joined to the vehicle body frame. In other words, in order to increase the joint strength, there is no bead portion on the body frame portion, so that a considerably long portion in the front-rear direction along the body frame is simply a flat plate, which is disadvantageous in terms of vibration. Become. On the contrary, if all the bead parts are also present in the body frame part,
Since the portion where the bead portion exists is not joined at all, the joining pitch becomes too long. For this reason, it is conceivable that the body frame is raised upward for each portion where the bead portion is present, and the beam portion is also joined, but in this case, the shape of the body frame becomes extremely complicated, and It will be difficult to adopt.

The present invention has been made in consideration of the above circumstances,
The bead portion formed on the floor panel can be appropriately positioned in the body frame portion without complicating the shape of the body frame, and the joint pitch between the floor panel and the body frame should not be too large. Therefore, it is an object of the present invention to provide an automobile floor structure having excellent rigidity as a whole.

(Means and Actions for Solving Problems) In order to achieve the above-mentioned object, the present invention has the following configuration. That is, in a vehicle floor structure in which a body frame extending in the front-rear direction is joined to the lower surface of the floor panel, and a bead portion bulging upward and extending in the vehicle width direction is formed on the floor panel, the body frame is A pair of joint flange portions, wherein the bead portion is discontinuous in the vehicle body frame portion, and the outer end portion of the inner bead portion in the vehicle width direction and the inner end of the outer bead portion in the vehicle width direction are formed. Portions are formed so as to be alternately positioned in the front-rear direction and do not extend beyond one of the pair of left and right joining flange portions of the vehicle body frame and reach the other, and the floor panel and the vehicle body frame are The left and right joint flange portions of the body frame are joined to each other at portions where the bead portions are not located.

With this configuration, the bead portion can be appropriately positioned on the body frame, and one of the left and right joint flange portions of the body frame must be in contact with the floor panel on the extension line of the bead portion. Can be joined together and the joining pitch is prevented from becoming too large.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a floor panel, and 2 is a pair of left and right body frames (side frames) joined to the lower surface of the floor panel 1 and extending in the front-rear direction.

The floor panel 1 has a tunnel portion 3 that largely bulges upward in the center portion in the vehicle width direction because it is a FR vehicle (front engine / rear drive vehicle). Further, the floor panel 1 is formed with a large number of bead portions each extending in the vehicle width direction, and the bead portions are formed on the inner side bead portion 4 located on the inner side in the vehicle width direction and on both left and right sides thereof. The left and right outer bead portions 5 are formed. The inner and outer bead portions 4 and 5 are alternately formed in the front-rear direction. Although FIG. 1 shows the case where the bead portions 4 and 5 are formed only in the middle portion in the front-rear direction in which vibration is particularly problematic, the bead portions 4 and 5 are similarly formed in the front portion and the rear portion. 5 may be formed.

On the other hand, as shown in FIGS. 2 and 3, the body frame 2 has a main body 2A having a substantially U-shaped cross section, and a pair of left and right joints extending from the left and right upper ends of the main body 2A. Flange part 2
B and 2C. As will be described later, the vehicle body frame 2 is joined below the floor panel 1 at its joining flange portions 2B and 2C, and cooperates with the floor panel 1 to form a closed cross section. ing.

The relationship between the body frame 2 and the inner and outer bead portions 4, 5 is as follows. First, as also shown in FIG. 4, the inner bead 4 has an outer end portion 4a whose inner end is the inner joint flange portion 2B of the pair of left and right joint flange portions 2B, 2C of the vehicle body frame 2. It is said that it extends to the outside in the vehicle width direction and extends to the vicinity of the outer side joining flange portion 2C, but does not reach the outer side joining flange portion 2C. On the other hand, the outer bead portion 5 has an inner end portion 5a in the vehicle width direction that exceeds the outer joining flange portion 2C of the pair of left and right joining flange portions 2B and 2C of the vehicle body frame 2. It is supposed that it extends to the outside and extends to the vicinity of the inner joining flange portion 2B, but does not reach the inner joining flange portion 2B. The floor panel 1 and the respective joint flange portions 2B and 2C of the vehicle body frame 2 are joined (spot welded in the embodiment) at the portions where the bead portions 4 and 5 are not located. is there.

In the automobile floor structure configured as described above, the bead portion 4 (the inner end portion 4a thereof) or the bead portion 5 (the outer end portion 5a of the bead portion 4) on the body frame 2 (the body portion 2A thereof)
Is located, the rigidity of the floor panel 1 itself is sufficiently secured even on the vehicle body frame 2, which is advantageous in terms of preventing vibration. By the way, as compared with the case where no bead portion is formed on the vehicle body frame 2, the inner end portions 4a or 5a of the inner and outer bead portions 4 and 5 can be formed, which is advantageous in terms of vibration prevention.

Further, in the front-rear direction of the vehicle body frame 2, one of the pair of left and right joining flange portions 2B and 2C can always come into contact with the floor panel 1 without being disturbed by the bead portion 4 or 5. It becomes possible to carry out the joining, and the joining pitch is prevented from becoming too large. By the way, as compared with the case where the bead portion is formed on the entire body frame 2, the portion indicated by reference numeral S1 in FIG. Of course, the body frame 2 itself may be formed by simply connecting the cross-sectional shapes as shown in FIG. 2 or FIG. 3, so that the shape of the body frame 2 can be prevented from becoming complicated.

(Advantages of the Invention) As is apparent from the above description, the present invention allows the bead portion formed on the floor panel to be positioned on the vehicle body frame without complicating the shape of the vehicle body frame, thereby preventing vibration. This is advantageous not only in terms of points but also in preventing the joint pitch between the floor panel and the vehicle body frame from becoming too large and sufficiently enhancing the joint strength between the two.

[Brief description of drawings]

 FIG. 1 is an overall upper perspective view showing an embodiment of the present invention. FIG. 2 is a sectional view taken along line II-II in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a top view of FIGS. 2 and 3. 1; Floor panel 2; Body frame 2B; Inner side joining flange 2C; Outer side joining flange 4; Inner side bead 5; Outer side bead S, S1; Joining point

Claims (1)

[Claims] 1. A floor structure of an automobile, wherein a vehicle body frame extending in the front-rear direction is joined to a lower surface of the floor panel, and a bead portion bulging upward and extending in the vehicle width direction is formed on the floor panel. Has a pair of left and right joint flange portions, and the bead portion is discontinuous in the vehicle body frame portion, and an outer end portion of a vehicle width direction inner side bead portion and a vehicle width direction outer side bead portion. Inner end portions of the floor panel and the vehicle body are formed so as to be alternately positioned in the front-rear direction and do not extend beyond one of the pair of left and right joining flange portions of the vehicle body frame and reach the other. The frame is joined to each other at a portion of the left and right joint flange portions of the vehicle body frame where the bead portion is not located.