JPS6285769A - Lower body structure for automobile - Google Patents

Abstract

PURPOSE:To aim at the dispersion of load out of a suspension and improvement in the rigidity of a car body, by connecting both front and rear parts of an arch type frame extending over in front and in the rear of a tire house each to an interval between longitudinal respective side sills where the tire house is formed. CONSTITUTION:A tire house 4 is joined to a fender inner panel 1 and a floor panel 2, and this tire house 4 is set up between respective longitudinal side sills 5 and 6 extending in a longitudinal direction at both sides of the floor panel 2. And, a trailing arm 8 of a rear tire 3 is connected to a front end position of the tire house as being movable up and down, and a shock absorber 10 is installed between the trailing arm 8 and the tire house 4. At the above- mentioned structure, each of these side sills 5 and 6 in front and in the rear is coupled together by an arch type frame 11. Then, the arch type frame 11 forms its sectional form into a hat type, and flanges 11a at both sides of it are joined to the inner panel 1.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a lower body structure of an automobile.

(Prior Art) Automobiles generally have a structure in which a tire house is connected to longitudinal side sills provided on both sides of the vehicle body. For example, Japanese Utility Model Application No. 58-149262 adopts the above structure, and also provides a rear frame that is fixed to the lower surface of the rear floor along the lower edge of the tire house, and connects the front part of this rear frame to the side sill. , describes a technique for connecting a reinforced rear frame to the rear of the rear frame to improve the strength of the rear floor.

By the way, shock absorbers and other suspension components are often attached to the tire house to alleviate the input to the vehicle body due to the upward movement of the tires, but in this case, the suspension load may be concentrated on a part of the tire house, or There is a risk that a large amount of force will be transmitted to the fender panel connected to the tire house, causing vibrations in the vehicle body.

(Object of the Invention) In view of the above, the present invention utilizes side sills connected to the tire house to improve suspension load distribution.
Accordingly, the present invention aims to provide a vehicle body structure that can improve the rigidity of the vehicle body.

(Structure of the Invention) In the lower body structure of an automobile of the present invention, a tire house is formed between both the front and rear side sills provided on the side of the vehicle body, and the tire house is formed between the front and rear side sills. On the other hand, the front and rear parts of an arch-shaped frame extending from above the front part to above the rear part of the tire house are respectively connected.

In the case of the present invention, even if a load from the suspension acts on the tire house, the load is distributed to the front and rear side sills of the tire house via the arched frame, and
Due to the arched frame.

The rigidity of the lower part of the car body is increased.

(Effects of the Invention) Therefore, according to the present invention, the arch-shaped frame can disperse the load from the suspension and at the same time increase the rigidity of the vehicle body, even when the suspension load and other external forces increase. This prevents deformation or vibration of the tire house and its surrounding parts, and improves the durability of the vehicle body.

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

In FIGS. 1 and 2, the rear lower part of the automobile is shown with the outer fender panel removed. That is, 51 is the inner panel of the fender, 2 is the floor panel, and 3 is the fender inner panel.
is a rear tire, and a tire house 4 is joined to a fender inner panel 1 and a floor panel 2, and the tire house 4 is connected to a front side sill 5 and a rear side sill 6 extending in the front and back direction on both sides of the floor panel 2. located between. At the front end position of the tire house 4, a cross member 7 is provided which is joined to the lower surface of the floor panel 2 and extends in the vehicle body rfJ direction.
A trailing arm 8 of the rear tire 3 is connected via a hinge member 9 so as to be movable up and down. In front of the rear tire 3, an air shock absorber 10 is provided between the front part of the trailing arm 8 and the front upper part of the tire house 4, and the front and rear side sills 5.6 are formed by an arch-shaped frame 11. connected.

Specifically, as shown in FIG. 3 is a longitudinal cross-sectional view at the center of the tire house 4, and FIGS. 4 and 5 are IV-IV and 5 and 6 are
Side sill members 5a and 6a each having an angular cross-section are joined to the inner surface of the fender inner panel 1 and the lower surface of the floor panel 2 to form a closed cross-sectional structure. The arch-shaped frame 11 has a cross-sectional shape shaped like a frame 1, is located between the inner panel 1 and the outer panel 12 of the fender, and is located between the flange 11 on the image side.
a and lla are joined to the inner panel 1 of this fender. That is, the arch-shaped frame 11 has a front portion that is connected to the front side sill 5 at the location where the cross member 7 is disposed.
The fender inner panel 1 is connected to the lower part of the fender inner panel 1 constituting the rear part of the fender, and extends upward from there so as to overlap the front part of the tire house 4 as shown in FIGS. 1 and 2. The arch-shaped frame 11 extends from above the front part of the tire house 4 to above the rear part, descends behind the rear part of the tire house 4, and joins at the rear part to the lower part of the fender inner panel 1 that constitutes the front part of the rear side sill 6. This results in a structure in which the front and rear side sills 5 and 6 are connected.

Further, as shown in FIG. 6, in the case of this embodiment, the tire house 4 is constructed by joining two members, a front house part 4a and a rear house part 4b, and the air shock absorber 10
The front house part 4a to which the two are connected is thicker than the rear house part 4b. Furthermore, a reinforcing member 13 having a hat-shaped cross section is joined to the fender inner panel 1 and the floor panel 2 at a rear position of the tire house 4 so as to face the rear part of the arch-shaped frame 11.

In FIG. 3, reference numeral 14 indicates a torsion beam that connects the left and right trailing arms 8 (only one of which is shown) of the vehicle body.

Therefore, in the above embodiment, the trailing arm 8
As the wheel moves up and down, the load from the air shock absorber 10 is transmitted to the front upper part of the tire house 4.
The load is transmitted to the surrounding members of the tire house 4, and is then transmitted to the front and rear side sills 5 and 6, thereby preventing local concentration of the load. Further, since the arch-shaped frame 11 is joined to the fender inner panel l along the tire house 4, the rigidity of the fender inner panel 1 is increased, and the fender inner panel l is affected by the load from the suspension and other external forces. Deformation or vibration is also prevented. Furthermore, since the front and rear side sills 5 and 6 are connected by the arch-shaped frame 11, the vehicle body becomes strong against loads from the front and rear directions.

Although the above embodiment employs a suspension having a trailing arm and a torsion beam, it goes without saying that the present invention can also be applied to automobiles equipped with other types of suspension.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view showing the lower body structure of an automobile, FIG. 2 is a perspective view thereof, FIG. ■～■ in Figure 1
The cross-sectional view, FIG. 5 is the same <V-■ cross-sectional view, and FIG. 6 is a perspective view of the tire house portion seen from the inside of the vehicle body. 1... Fender inner panel, 2... Floor panel 53... Rear tire, 4...
・Tire house, 5...Front side sill, 6...
...Rear side sill, 7...Cross member,
8...1-railing arm, 10...
・Air shock absorber, 11... Arch-shaped frame.

Claims (1)

[Claims] (1) In a vehicle in which a tire house is formed between the front and rear side sills provided on the side of the vehicle body,
A lower body structure for an automobile, wherein the front and rear parts of an arch-shaped frame extending from above the front part to above the rear part of the tire house are respectively connected to both the front and rear side sills.