JPS6013730Y2 - frame structure - Google Patents

Description

[Detailed description of the invention] This invention relates to the frame structure of automobiles, etc., and aims to increase the shock absorption energy in the event of a collision, etc., and at the same time perform regular buckling deformation to improve the stability of the shock absorption characteristics. The purpose of this is to provide a frame structure that allows for

For example, a frame that is fixed to the lower inner surface of the front fender panel by welding or the like toward the front will buckle and deform when a large impact load is applied in the longitudinal direction, such as during a car crash. However, if the resistance of the frame to the impact load is low, the ability to absorb impact energy due to buckling deformation is low, and the deformation due to the impact may extend into the passenger compartment and cause injury to passengers. Gender arises.

In general, when a longitudinal load P is applied to a member A with a closed cross section as shown in Figure 1A, the upper and lower surfaces protrude outward at a certain point a, as shown in the figure, and at the same time both side surfaces inwardly deform. When it is deformed in a concave direction, at the next position, conversely, the upper and lower surfaces are deformed inwardly, and at the same time both side surfaces are deformed in a protruding manner outwards.Furthermore, at the next position C, it deforms in the same way as in a, and in this way, The member A undergoes regular buckling deformation in a bellows-like manner.

This buckling pitch 1 is such that the total circumferential length of member A is >174.

If a reinforcing member B is fixed to the interior of such a closed cross-section member A to form a partition vertical wall as shown by the chain line in Figure A, the resistance against the load P will increase significantly. During buckling deformation, the reinforcing member B is stretched, making it difficult to deform smoothly.

The present invention provides a frame structure that increases the resistance of the frame to impact and allows regular buckling deformation, and will be described below with reference to the embodiment shown in FIG.

Figure 2 shows an embodiment of the present invention, in which 1 is a frame;
Reference numeral 2 denotes a vehicle body such as a fender panel, and the frame 1 is fixed to the vehicle body 2 by welding or the like to form a closed cross section.

Reference numeral 3 denotes a reinforcing member whose both ends are bonded and fixed within the frame 1 by welding or the like, and the inside of the closed section formed by the frame 1 and the vehicle body 2 is partitioned by the reinforcing member 3.

In the present invention, a slit 4 is provided in the partition wall-shaped reinforcing member 3 installed in the frame 1 in the longitudinal direction, and the joint fixing portions at both ends of the reinforcing member 3 are separated from each other by the slit 4. By doing so, when a load P acts on the frame 1 in its longitudinal direction and each side of the frame 1 protrudes outward and deforms inwardly, the slit 4 of the reinforcing member 3 acts as a buffer against the deformation. This is so that the regular buckling deformation of the frame 1 is not disturbed.

Experimentally, the frame 1 had a plate thickness of 1.2 mm, the top and bottom sides were each 55 mm, the side sides were 75 mm, and a slit 4 with a width of 20 rrrtrt was provided in the reinforcing plate with a thickness of 0.7 mm, as shown in the figure. For those installed in frame 1,
It was confirmed that the average resistance against the load P was approximately 46% higher than that without the reinforcing member 3, and that the frame 1 buckled regularly in a bellows shape.

The embodiment shown in FIG. 2 shows an example in which a portion where the slit 4 is not provided is left at the rear end of the reinforcing member 3.
The slit 4 may be provided over the entire length of the reinforcing member 3 in the longitudinal direction.

As described above, according to the present invention, in a frame having a closed cross section or close to a closed cross section, a reinforcing member is installed in the frame in the shape of a partition wall in the longitudinal direction, and the reinforcing member in the shape of the partition wall prevents buckling deformation of the frame. By providing a slit in the longitudinal direction of the frame to serve as a buffer, the resistance to longitudinal loads of the frame is increased, and the frame undergoes regular bellows-like buckling deformation due to the load, stabilizing the impact energy. In particular, when this invention is applied to the front lower frame of an automobile, it can significantly improve the safety of occupants in the event of a collision, and the structure is extremely simple. Together with this, it can have a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating how a general frame is deformed in response to a load acting in the longitudinal direction, and FIG. 1 is a perspective view of the frame, and FIG. FIG. 2 is a cross-sectional perspective view showing an embodiment of the present invention. 1...Frame, 2...Vehicle body, 3...
...Reinforcement member, 4...Slit.

Claims (1)

[Scope of utility model registration request] In a frame with a closed cross section or close to a closed cross section, a reinforcing member is attached to the partition wall shape in the longitudinal direction by fixing both ends of the reinforcing member to the frame, and the reinforcing member is attached to the reinforcing member in the longitudinal direction. A frame structure characterized by a slit that spans the entire length.