JPH08108861A - Hollow member made of steel plate - Google Patents

Abstract

PURPOSE: To provide a hollow member made of steel plate in which stagnant water on the welded part can be prevented in particular and the manufacturing cost can be reduced. CONSTITUTION: This hollow member made of steel plate is constituted so that the opening end of a cylindrical male member 2 is fitted in the opening end of a cylindrical female member 1 formed with a nearly V-shaped cutout 3, and the opening end of the female member and the outer circumference of the male member are joined together by welding. The cutout is formed deeper than a fixed engagement allowance, and hence a hole 4 allowing the inside to communicate with the outside is defined on the bottom part of the cutout, in the condition of engaging the female and male both members with each other. In this way, there is no need for providing a drain hole in particular, and hence the manufacturing cost can be reduced. In addition, the hole for drainage is formed in the vicinity of the welded part, and hence stagnant water on the welded part can be prevented, so as to effectively improve rust prevention property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate hollow member, and more particularly to a steel plate hollow member in which water drainage holes can be easily formed.

[0002]

2. Description of the Related Art For example, in order to pivotally attach one end of a suspension arm to a vehicle body frame side, a suspension member interposed between an arm pivotal portion and a vehicle body frame is welded by pressing a steel plate. It is generally formed hollow.

In this suspension member, as shown in FIG. 3, the open end of a cylindrical male member 22 is fitted into the open end of a cylindrical female member 21, and the outer surface of the male member 22 and the female member are fitted. Some of them are welded to each other by fillet welding the opening surface of 21. Both of the female and male members 21 and 22 are formed by spot welding by overlapping the flange portions on both sides of a pair of upper and lower gutter-shaped plate members that have been press-formed. The bottom plate portion 21a of the female member 21 is provided at this joint portion for the purpose of relieving stress concentration on the weld bead due to bending or the like.
A substantially V-shaped notch 23 is formed at the open end of the.

In such a suspension member, when the vicinity of this joint is the lowermost part of the member, in order to prevent the water that has penetrated inside the member from corroding and corroding the plate material, conventionally, a trim at the time of press molding is used. Drain hole 2 in the process
4 was perforated.

[0005]

However, in such a conventional type drainage structure, if the notch and the drainage hole are punched at the same time during press forming, the trim range becomes wide and the manufacturing cost becomes low. There was an inconvenience that it increased. In addition, since the two are separated from each other, water may be accumulated in the welded portion due to deformation of the member and rust may be generated.

The present invention has been devised in order to eliminate such disadvantages of the prior art, and its main purpose is to:
In particular, it is to provide a hollow member made of a steel plate that can prevent water from being accumulated in the welded portion and can reduce the manufacturing cost.

[0007]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide an opening end of a cylindrical male member with an opening end of a cylindrical female member having a substantially V-shaped cutout. A hollow member made of a steel plate, which is fitted and is welded and joined to an open end of the female member and an outer periphery of the male member, wherein the notch is formed deeper than a predetermined fitting allowance, whereby the female and male It is achieved by providing a hollow member made of a steel sheet, characterized in that a hole communicating between the inside and the outside is defined in the bottom portion of the cutout in a state where both members are fitted.

[0008]

With this structure, the bottom portion of the notch serves as a hole that communicates the inside and outside when the female member and the male member are fitted to each other, so that it is not necessary to separately provide a drain hole, and the trim range can be reduced. You can Moreover, since the formed hole is arranged close to the welded portion, it is possible to prevent water from being accumulated in the welded portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a main part of a suspension member of an automobile, which is one of the steel plate hollow members to which the present invention is applied, and is an enlarged view of a connection part indicated by A in FIG. . In FIG. 1, for convenience of explanation,
The drawings are shown upside down, and the upper surface of the drawing is the lower surface when actually used.

As shown in FIG. 2, the suspension member 1 extends in a pair in the front-rear direction of the vehicle body and is viewed in plan from the three lateral members 2.3.4 extending in the left-right direction. The so-called sub-frames are integrally connected so as to form a letter shape. On the upper surface of the suspension member 1, a double wishbone type front suspension 5
The inner end of the lower arm 6 is pivotally attached.

As shown in FIG. 1, the connecting portion of the suspension member 1 shown by A in FIG. 2 is a cylindrical female member 1.
Insert the open end of the cylindrical male member 12 into the open end of 1,
The outer surface of the male member 12 and the opening surface of the female member 11 are joined by fillet welding. Both female and male members 11.1
2 is formed by superimposing the flange portions on both sides of a pair of upper and lower gutter-shaped plate members that are press-molded and joined by spot welding. In addition, a substantially V-shaped notch 13 deeper than the fitting margin is formed at the opening end portion of the bottom plate portion 11 a of the female member 11. In this way, by fitting both male and female members while leaving the bottom portion of the notch 13,
A hole 14 that communicates the inside and the outside is formed in the bottom portion of the notch 13.

[0013]

As is apparent from the above description, according to the steel plate hollow member of the present invention, it is not necessary to separately form a water drain hole, so that the manufacturing cost can be reduced. Moreover, since the water drainage hole is formed in the vicinity of the welded portion, it is possible to prevent water from accumulating in the welded portion, which is effective in improving rust prevention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a connecting portion of a suspension member to which the present invention is applied.

FIG. 2 is a perspective view showing the entire front wheel subframe.

FIG. 3 is a perspective view showing a connection portion of a conventional suspension member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Suspension member 2/3 4 Lateral member 5 Suspension 6 Lower arm 11 Female member 11a Bottom plate part 12 Male member 13 Notch 14 hole 21 Female member 21a Bottom plate part 22 Male member 23 Notch 24 Drain hole

Claims (1)

[Claims] 1. An open end of a cylindrical male member is fitted into an open end of a cylindrical female member in which a substantially V-shaped cutout is formed,
A hollow member made of a steel plate obtained by welding and joining an open end of the female member and an outer periphery of the male member, wherein both the female and male members are formed by forming the notch deeper than a predetermined fitting margin. A hollow member made of a steel sheet, characterized in that a hole for communicating the inside and the outside is defined in a bottom portion of the cutout in a fitted state.