JPH06182561A - Peeling preventive structure for deposited part - Google Patents

Abstract

PURPOSE:To increase the maximum supporting load of the deposited part and to prevent the deposited part from peeling by averaging the load of a welding point at the deposited part of sheet metals when the concentrated load is acted on the sheet metals. CONSTITUTION:A sheet belt fitting part A is fixed on a front floor 1 of a vehicle, the front floor 1 and a rear floor 2 are fixed on spot weld zone B, C and D, a small oblong hole 5 is formed on a front floor part 6 between A and C to enhance a coefficient of extension of the front floor part 6 and when the concentrated load F is acted on the sheet belt fitting part A, the shared loads on the respective spot weld zones B, C and D are made almost equal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a welded portion of a sheet metal from being easily peeled off by a concentrated load acting on the sheet metal.

[0002]

2. Description of the Related Art In a vehicle, a seat belt is provided to protect an occupant in the event of a collision or the like.
Further, as illustrated in FIG. 5, when the seatbelt mounting portion A is fixed to the front floor 1 made of sheet metal, a forward concentrated load F acts from the seatbelt to the seatbelt mounting portion A. When you do, front floor 1
Is almost entirely loaded toward the horizontal spot welding portions B, C, and D that fix the front floor 1 and the rear floor 2 close to the seatbelt mounting portion A, respectively, and the periphery of the seatbelt mounting portion A The concentrated load F is absorbed by the deformation of the floor sheet metal. In that case,
From the seatbelt attachment portion A of the front floor 1 to the spot welded portions B, C, and D, the same material is used as a whole and has the same elongation, and the concentrated load F and the input direction are the same. Since the spot weld portion C closest to the seat belt attachment portion A at the input point is loaded with a larger load than the other spot weld portions B and D, both floors 1, 2
In order to prevent peeling at the spot welds C, conventionally, by increasing the strength of each spot weld B, C, D, or by increasing the number of welding points by narrowing the interval between each spot weld, It was necessary to increase the fixing strength of both floors 1 and 2, which means that spot welding portion B, which is relatively distant from seat belt attachment portion A at the input point,
This means that D has an excessive strength, and as a result, the welded portion of the sheet metal partially retains the excessive strength, resulting in a wasteful increase in the welding cost.

[0003]

SUMMARY OF THE INVENTION According to the present invention, the maximum support that a welded portion of a sheet metal can bear when a concentrated load acts on the sheet metal without taking any strengthening means such as increasing the number of welding points in the welded portion of the sheet metal. The load is increased to prevent the welded portion from peeling off.

[0004]

Therefore, the structure for preventing peeling of a welded portion according to the present invention has a sheet metal on which a concentrated load acts and a member welded to the sheet metal on the side opposite to the direction of the concentrated load. A weak point portion against extensional deformation is formed in the sheet metal portion between the point of action of the concentrated load and the weld portion close to the point of action.

[0005]

In other words, since a weak point portion against extensional deformation is formed in the sheet metal portion between the point where the concentrated load acting on the sheet metal is applied and the weld portion close to this point, when the concentrated load acts on the sheet metal,
Since the sheet metal portion is more likely to be stretched and deformed as compared to other sheet metal portions in which weak points are not formed, the load acting on the welded portion is also suppressed to a relatively low value, resulting in an overall load sharing in the welded portion of the sheet metal. Are averaged, the maximum supporting load of the entire welded portion is increased, and the welded portion is less likely to peel off.

[0006]

Embodiments of the present invention shown in the drawings will be described below.
The same parts as those of the conventional structure will be described with the same reference numerals. In FIG. 1, the front floor 1 and the rear floor 2 are fixed to each other by a row of spot welds B, C, and D in the vicinity of the rear of a seat belt attachment portion A fixed to a front floor 1 of a vehicle. , A spot welding portion C closest to the seatbelt attaching portion A and directly behind the seatbelt attaching portion A and a seatbelt attaching portion A
A small elongated hole 5 is formed in the front floor 1 between and.

Therefore, when a forward concentrated load F acts on the seat belt attachment portion A, the portion 6 between the AC portions of the front floor 1 is provided with the elongated holes 5 so that the AB portion is formed.
Compared with the portion 7 between the AD and the portion 8 between the AD, the elongation deformation is easier, so that each spot welded portion B, C,
The loads D are almost equal. That is, even if the concentrated load F acts, the spot welded portion C does not have a particularly large load, and the concentrated load F is substantially evenly distributed to each spot welded portion B, C, D, and each spot welded portion B is distributed. , C, D share almost the same load, the maximum supporting load capable of supporting the concentrated load F by all the spot welded parts B, C, D without the floors 1 and 2 partially peeling off is , Significantly increased as compared with the conventional case where the long hole 5 is not formed.

FIG. 2 shows that when the distance 11 between the front floor portion 6 between AC and the distance 12 between the front floor portion 7 between AB and the front floor portion 8 between AD are relatively changed, The elongation rate S1 of the front floor portion 6 and the elongation rate S2 of the front floor portion 7 and the front floor portion 8 when the loads acting on the spot welds B, C, D in the horizontal row by the concentrated load F become equal to each other Ratio: S1 / S2, for example, l1 /
When l2 = 0.7, the elongation ratio: S1 / S2 = 2, that is, the elongation S1 of the front floor portion 6 is twice the elongation S2 of the front floor portions 7 and 8 so that the long hole 5 By appropriately selecting the shape and size of the above, the loads acting on the spot welds B, C, and D become equal, and the loads can be evenly shared.

The solid line in FIG. 3 indicates the spot welds B, C,
When the value of l1 / l2 is changed while making the loads acting on D equal to each other as described above, the magnitude of the concentrated load F when the front floor 1 starts to separate from the rear floor 2, that is, the total load F Spot weld B,
3 shows an example of changes in the maximum supporting load due to C and D, and the broken line in FIG. 3 shows the maximum supporting load in the case of the conventional example. For example, when l1 / l2 = 0.7, the maximum supporting load is the conventional example. It can be seen that it has reached about 1.4 times that in the case of.

As described above, by forming the elongated hole 5 in the front floor portion 6 and adjusting the elongation rate of the front floor portion 6, the load sharing of each spot welded portion B, C, D with respect to the concentrated load F is made. Since they can be equalized and their total maximum supporting load can be easily increased, the front floor 1 can be prevented from peeling off from the rear floor 2 relatively easily.

The elongated holes of the above-described embodiment may be appropriately changed to holes having other shapes, and instead of these holes, a bead of an appropriate shape and size or a plate thickness may be partially changed. By forming a recess for thinning in the sheet metal portion between the point of action of concentrated load and the weld portion close to the point of action, the elongation rate of the sheet metal portion is adjusted, and the same action as in the case of the above example Can be configured to be effective, and
The welded portion is not limited to the spot welding as described above, and even for a continuous welded portion of a sheet metal, the stretchability is continuously increased according to the distance between the point of action of concentrated load and the welded portion. By appropriately forming the weak points of varying elongation deformation in the sheet metal part, the elongation rate of the sheet metal part between the point of action of the concentrated load and the welded part is adjusted, and the load acting on the continuous welded part by the concentrated load It is possible to increase the maximum supporting load easily so that there is not much unevenness in the size of, and further, even if the weld is not symmetrical with respect to the line of action of concentrated load, By appropriately adjusting the elongation rate of the sheet metal portion between the action point of the concentrated load and the welded portion, it is possible to obtain the same action and effect as described above, and the sharing of the action on the welded portion by the concentrated load. The load is not always equal Also, the advantages can be attained according to the average of the shared load of course. Further, the present invention is not limited to the vehicle portion as described above, but can be widely implemented when the welded portion shares the load with respect to the sheet metal on which the concentrated load acts.

[0012]

In the structure for preventing peeling of the welded portion according to the present invention, when a concentrated load is applied to the sheet metal, the load sharing in the welded portion supporting the concentrated load is more averaged than in the conventional case. The maximum supporting load of the entire welded portion increases, and it is possible to easily prevent the sheet metal from peeling off from the welded portion due to the concentrated load. Therefore, the number of sheet metal welding steps or the welding cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part in an embodiment of the present invention.

FIG. 2 is an explanatory view of the operation of the above embodiment.

FIG. 3 is an explanatory view of the operation of the above embodiment.

FIG. 4 is a schematic perspective view of a conventional structure.

5 is an enlarged plan view of a V portion of FIG.

[Explanation of symbols]

 1 Front floor 2 Rear floor 5 Long hole A Seat belt attachment part B Spot weld part C Spot weld part D Spot weld part F Concentrated load

Claims (1)

[Claims] 1. A sheet metal on which a concentrated load acts and a member welded to the sheet metal on the side opposite to the direction of the concentrated load, and between a point of action of the concentrated load and a weld portion close to the point of action. A peeling prevention structure for a welded portion, in which a weak point portion against extensional deformation is formed in the sheet metal portion.