JPS598941Y2 - Automotive body floor structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an automobile body floor structure.

As shown in FIG. 6, the conventional car body floor structure has a frame D with a hat-shaped cross section extending in the front-rear direction on the lower surface of the floor panel A between the floor tunnel B and the side sill C.
By fixing it, a closed cross section E is formed, and the rigidity in the front and rear direction is increased by the closed cross section E extending in the front and rear direction. It is secured by multiple horizontal beads F at the front and rear.

However, according to this conventional structure, floor panel A
Since the absolute size of the closed cross section E formed by the frame D and the frame D is small, the stiffening effect of the closed cross section E in the longitudinal direction of the vehicle body floor is still insufficient.

In addition, this closed section E portion and the lateral bead F... have no substantial connection and have a structure that bears loads in different directions separately from each other, so the stiffening efficiency is poor in both the front and rear directions and the left and right directions. It became.

For this reason, combined with the fact that the stiffening effect itself due to the closed cross section E is low, it has become relatively weak against large loads in the front and rear direction, especially due to collisions and the like.

Therefore, the present invention eliminates these drawbacks of the conventional structure and
A high reinforcement effect is obtained in both the front and rear directions and the left and right directions,
The present invention aims to provide an automobile body floor structure that can significantly improve the strength of the car body floor.

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

1 is a floor panel, 2 is a floor tunnel, and 3 is a side sill. A frame 4 having a hat-shaped cross section extending in the front-rear direction is fixed to the lower surface of the floor panel 1 between the floor tunnel 2 and the side sill 3.

Furthermore, a vertical bead 5 having an inverted U-shaped cross section is provided at a position facing the frame 4 on the floor panel 1 in parallel with the frame 4 and protruding upward along the front-rear direction.

The vertical bead 5 and the frame 4 form a rectangular closed section 6 extending in the front-rear direction, and this closed section 6 provides an auxiliary effect to the floor panel 1 in the front-rear direction.

The width dimensions of the frame 4 and the vertical bead 5 are generally the same, that is, the top widths are the same, and the opening widths m1 and m are the same.
2, the width m2 of the vertical bead 5 is slightly larger than the width md of the frame 4 for reasons to be described later.

7... is a horizontal bead extending in the left-right direction, and has a U-shaped cross section and protrudes downward at several places in the front and rear of the floor panel 1 between the vertical bead 5, the floor tunnel 2, and the side sill 3. 7... are butted against and coupled to the vertical bead 5.

More specifically, by recessing the left and right rising walls 51, 51 on both sides of the vertical bead 5 continuously and inwardly with the same width as the horizontal beads 7..., the ends 71, 51 of the horizontal beads 7... . . are butted and connected by biting into the vertical bead 5.

On the other hand, both left and right wing portions 41 of the frame 4 correspond to the connection ends 71 of the horizontal beads 7 with respect to the vertical beads 5.
．． 41 has a recess 4 into which the connecting end 71 is fitted.
2... is provided.

In this way, the longitudinal bead 5 and the frame 4 forming a closed cross section 6
are connected to the transverse bead 7, thereby forming a closed section 6
The structure is such that a load transmission action, or in other words, a mutual stiffening action, can be effectively performed between the portion and the lateral bead 7.

In this case, the recesses 42... are the left and right wing parts 41... of the frame 4, as shown in the figure. 41 only. It is shaped so that it does not extend to the ridgeline of the rising walls 43, 43, 44.

In order to ensure such a state, as mentioned above, the width m2 of the opening of the vertical bead 5 is set slightly larger than the width m1 of the opening of the frame 4, that is, the width of the horizontal bead 7 relative to the vertical bead 5.
It has been made larger and more impressive by the amount of money it has taken to cut into it.

In this way, at the intersection of the frame 4 and the horizontal beads 7, the recesses 42 for fitting the horizontal beads of the frame 4 are formed.
The rising wall 43, keeping it only on both wing parts 41, 41,
By leaving the ridge lines 43 and 44 over the entire length, it is possible to prevent the strength of the frame 4 from decreasing in the front-rear direction.

According to the above-described vehicle body floor structure, a closed section 6 extending in the front-rear direction is formed by the frame 4 and the vertical bead 5 that projects from the floor panel 1 and faces the frame 4. The closed cross section 6 is much larger than the closed cross section E of the conventional structure shown in FIG. 6, and thereby the rigidity of the floor panel 1 in the longitudinal direction can be dramatically increased.

Also, the horizontal bead 7... is connected to the vertical bead 5 and the frame 4.
Since it is connected to the horizontal bead 7, the load in the left and right direction acting on the horizontal bead 7 is also received by the closed section 6, and conversely, the closed section 6
The longitudinal load applied to the section is also shared by the lateral beads 7... and the closed section 6.
The parts will reinforce each other.

Therefore, when using this structure, a high reinforcing effect can be obtained in both the longitudinal direction and the lateral direction of the vehicle body floor, and the strength of the entire floor can be significantly improved.

In the above embodiment, the horizontal bead 7 is shaped to project downward, but the horizontal bead 7 may be shaped to project upward as shown in FIG. 4.

Even in this case, there is no difference in that the end portion 71 of the horizontal bead 7 is connected to the vertical bead 5.

Further, in this case, in order to connect the frame 4 and the horizontal bead 7, both wing portions 41. 41, horizontal bead 7
A convex portion 45 that fits into is provided.

By doing so, it is also possible to prevent mud and water that promote rust from entering the inside of the closed section 6 defined by the frame 4 and the vertical beads 5.

As mentioned above, according to the vehicle body floor structure of the present invention,
The vertical bead of the floor panel and the frame form a closed section extending in the front-rear direction, and the horizontal beads are connected to both the vertical bead and the frame of the closed section on the floor panel on both sides of this closed section. By shaping
Since the load is transmitted between the closed cross section and the lateral bead, the rigidity of the vehicle floor in the longitudinal and lateral directions can be greatly increased, and the load bearing capacity in both directions can be improved, especially in the event of a collision. It can exert high resistance against large loads in the front and rear directions.

Furthermore, at the joint between the horizontal bead and the frame, the concave or convex portions of the frame that fit into the horizontal bead are provided only on both wings of the frame, leaving the ridgeline of the rising wall over the entire length, which reduces the load in the longitudinal direction. It is advantageous in terms of strength.

Furthermore, by improving the rigidity of the vehicle body floor, vibration and noise of the floor during driving can be prevented.

[Brief explanation of drawings]

Fig. 1 is a partially schematic perspective view of a vehicle body floor showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along line II-II in Fig. 1, Fig. 3 is a partially enlarged perspective view of the frame, and Fig. 4. is a diagram equivalent to FIG. 2 showing another embodiment, FIG. 5 is a diagram equivalent to FIG. 3,
FIG. 6 is a partial perspective view of a vehicle body floor showing a conventional example. 1... Floor panel, 2... Floor tunnel, 3... Side sill, 4... Frame, 41, 41... Same frame Both left and right wing parts, 42, 42... Same concave part, 43, 43.
...Same rising wall, 44, 44...
Same ridge line, 45, 45... Same convex part, 5...
・Vertical bead, 6...Closed section, 7...Horizontal bead.

Claims (1)

[Scope of utility model registration request] A frame with a hat-shaped cross section extending in the front-rear direction fixed to the lower surface of the floor panel between the side sill and the floor tunnel, and a frame protruding upward with approximately the same width as the frame at a position opposite to the frame on the floor panel marked -h. A closed cross section is formed by the longitudinal bead extending in the longitudinal direction, and the floor panels on both sides of the longitudinal bead include:
A horizontal bead is formed which is connected to the vertical bead and extends in the left-right direction and protrudes either upwardly or downwardly, and the horizontal bead is formed on both wing portions of the frame, leaving a ridgeline on the upper side of the rising wall of the frame. An automobile body floor structure characterized by having either an upwardly protruding convex portion or a downwardly concave concave portion for fitting into the floor structure.