JPH0443428Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an automobile floor side member structure that prevents stress concentration from occurring.

(Prior art) Conventionally, the floor side members of automobiles have an 8th
Among the figures, there is one shown in FIG. 11. This will be explained using a diagram. The arrow Fr in the figure indicates the front of the vehicle body. Floor side members 22 are attached to each side of the floor panel 21. The floor side member 22 is formed of a substantially horizontal top plate 23 extending in the longitudinal direction of the vehicle body, and a side plate 24 extending downward from the inner edge of the top plate 23 in the vehicle width direction, and has an inverted substantially L-shaped cross section. is doing. 25 is a side sill, and 26 is a door.

In the above configuration, the rear part of the floor side member 22 is required to have higher strength than the front part of the floor side member 22 for reasons such as supporting the rear suspension. Therefore, as particularly shown in FIG. 10, the width W of the front part of the top plate 23 is made larger than the width W of the rear part.

(Problems to be Solved by the Invention) By the way, since the width of the upper plate 23 changes in the middle part of the front and back, stress tends to concentrate in this part. Therefore, when a car is rear-ended and a load is applied to the floor side member 22, stress concentration occurs at the portion where the width dimension of the top plate 23 changes as described above, and the floor side member 22 easily breaks at this portion. There is a risk of bending.

(Purpose of the invention) This invention was made with attention to the above-mentioned circumstances. When a car is rear-ended and a forward load is applied to the floor side member, the The purpose is to prevent stress concentration from occurring in the portion where the width dimension of the upper surface plate changes, thereby preventing the floor side member from easily bending in this portion.

(Structure of the invention) The feature of this invention to achieve the above object is that the floor side member is composed of a top plate and a side plate, and the width of the top plate is formed so that it changes in the front and back part. In this case, the rigidity is improved by forming a bent part on the side plate corresponding to the changing part.

(Example) Hereinafter, an example of this invention will be described with reference to FIGS. 1 to 7.

In FIGS. 2 and 3, 1 is the underbody of an automobile, 2 is a front wheel, 3 is a rear wheel, and 4 is a steering wheel. Further, the arrow Fr in the figure indicates the front of the vehicle body.

The underbody 1 has a floor panel 6. A stepped portion 7 is formed in the middle of the front and back of the floor panel 6, and with this stepped portion 7 as a boundary, the front portion of the floor panel 6 is low and the rear portion is high. A pair of left and right front seats 8, 8 are provided at the front of the floor panel 6, and a rear seat 9 is provided at the rear. Further, a door 10 is provided on each side of the vehicle body.

Floor side members 11 are attached to each side of the floor panel 6, and the rear ends of the floor side members 11 are connected to each other by a cross member 12. In addition, each floor side member 1
The rear end of the floor side member 11 is located inward in the vehicle width direction and above the front side of the floor side member 11, thereby preventing the rear end of the floor side member 11 from interfering with the rear wheel 3. It's summery.

The floor side member 11 will be explained in detail with reference to FIG. 1 and FIGS. 4 to 7.

This floor side member 11 has an upper surface plate 14 extending in the longitudinal direction of the vehicle body, and a side surface plate 15 extending downward from the inner edge of the upper surface plate 14 in the vehicle width direction,
It has an inverted L-shaped cross section. A side sill 16 is joined to the outer surface of this floor side member 11 so as to form a middle structure together with this floor side member 11, and both are welded together by spot welding.

In particular, as shown in FIG. 4, the width W of the rear portion of the upper surface plate 14 is made larger than the width W of the front portion, thereby improving the strength of the rear portion of the floor side member 11. In the above case, the inner edge in the wheel direction of the front-rear midway portion of the upper surface plate 14 is an inclined edge 14a that gradually inwards in the vehicle width direction as it moves toward the rear of the vehicle body.

An inverted triangular side plate 15c having the inclined edge 14a as its base extends from the front of the upper plate 14, and a rear edge 15a of the side plate 15, and a side plate 15c extending from the rear of the upper plate 14. front edge 15b of
are connected to each other. Note that the top plate 14
and a side plate 15 including an inverted triangular side plate 15c.
It is an integrally formed piece, which is formed by bending a metal plate.

Further, the lower end apex 15d of the inverted triangular side plate 15c is positioned further forward than the front end of the inclined edge 14a, particularly as shown in FIGS. 1 and 4. That is, the portion of the top plate 14 corresponding to the front end of the inclined edge 14a is a portion where stress concentration is likely to occur, and the side plate 15 corresponding thereto has an inverted triangular side plate 15 as shown in FIG.
The bending angle c is formed to improve the rigidity.

In the above configuration, for example, assume that a car is rear-ended and a load is applied to the floor side member 11 from the rear end toward the front. In this case, since the rear end of the floor side member 11 is located above the front side thereof, this floor side member 11
tries to bend upward, and at this time, the inclined edge 14
Stress tends to concentrate on the front end portion of a. However, as mentioned above, since the rigidity of the corresponding part is improved by the inverted triangular side plate 15c, stress concentration on this part is prevented, and therefore, the floor side member 11 is prevented from being easily bent.

(Effect of the invention) According to this invention, the floor side member is composed of a top plate and a side plate extending from the inner edge of the top plate, and the width of the rear side is wider than the width of the front part of the top plate. In order to increase the angle, the inner edge of the upper surface plate at the middle part of the front and back is formed into an inclined edge that gradually goes inward in the vehicle width direction as it goes rearward, and an inverted triangular side plate with this inclined edge as the base In an automobile floor side member structure in which the rear edge of the side plate extending from the front part of the upper plate and the front edge of the side plate extending from the rear part of the upper plate are connected to each other, the inverted triangular side plate is Since the lower end apex is located forward of the front end of the sloped edge, the part of the top plate corresponding to the front end of the sloped edge is a part where stress concentration is likely to occur, but the side plate corresponding to this part has an inverted triangular shape. The side plates are bent to improve rigidity.

Therefore, for example, when a car is rear-ended and a load is applied forward from the rear end of the floor side member, stress is prevented from concentrating on the front end portion of the sloped edge. The member is prevented from easily bending.

[Brief explanation of the drawing]

Figures 1 to 7 show examples of this invention,
Fig. 1 is a partially enlarged view of Fig. 3, Fig. 2 is a schematic plan view of the underbody, and Fig. 3 is a - of Fig. 2.
4 is a sectional view taken along the - line in FIG. 1, FIG. 5 is a sectional view taken along the - line in FIG. 1, and FIG. 6 is a sectional view taken along the - line in FIG. , FIG. 7 is a sectional view taken along the - line in FIG. 1, and FIG.
1 shows a conventional example, FIG. 8 is a diagram corresponding to FIG. 3, FIG. 9 is a partially enlarged view of FIG. 8, FIG. 10 is a view taken along the - line in FIG. 9, and FIG. FIG. 9 is a sectional view taken along the - line in FIG. 9; DESCRIPTION OF SYMBOLS 1...Underbody, 6...Floor panel, 11...Floor side member, 14...Top plate, 14a...Slope edge, 15...Side plate, 15a
...Rear end edge, 15b... Front end edge, 15c... Inverted triangular side plate, 15d... Lower end apex, W... Width dimension, w... Width dimension.

Claims (1)

[Scope of utility model registration request] A floor side member is attached to each side of the vehicle body floor panel, and this floor side member is comprised of a substantially horizontal top plate extending in the longitudinal direction of the vehicle body and a side plate extending downward from the inner edge of the top plate in the vehicle width direction. The upper surface plate is formed into an inverted substantially L-shaped cross-sectional shape, and as the inner edge of the upper surface plate moves toward the rear, the width of the rear portion is larger than the width of the front portion of the upper surface plate. The side plate has an inverted triangular shape with a sloped edge gradually inward in the vehicle width direction, and the side plate has an inverted triangular shape with the sloped edge as the base, and the rear end edge of the side plate extends from the front part of the top plate, and the rear edge of the side plate extends from the rear part of the top plate. An automobile floor side member structure in which the front edges of the inverted triangular side plates are connected to each other, wherein the lower end apex of the inverted triangular side plate is located forward of the front edge of the inclined edge. Side member structure.