JP2524507Y2 - Box structure bolts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a bolt for a box structure which is attached with a predetermined space between members to be tightened facing each other.

<Related Art> A box structure bolt is a bolt that is attached with a predetermined space between members to be fastened, and is used, for example, in a joint portion between a member of an automobile and a vehicle body.

FIG. 2 shows a conventional bolt for box structure, which comprises a head part a, a shaft part b, and a screw part c.

The method of attaching to the material to be tightened includes two materials to be tightened d1,
A collar f is mounted between the bolt mounting holes e1 and e2 of d2, a bolt is penetrated through the collar f, and the bolt head a is fixed to the tightened member d1 by welding or caulking.

<Problems to be solved by the present invention> In mounting the conventional box structure bolts,
It is necessary to attach the collar f as described above.

When the collar f is attached, it is necessary to fix the collar f by welding it to the materials d1 and d2 to secure the strength of the box and to reduce noise (weld portion g).

However, this welding operation is very difficult, especially when the gap between the tightened members d1 and d2 is narrow.

In addition, slippage is likely to occur on the fastening surface due to the gap between the collar f and the bolt, and in order to make slippage less likely to occur, the fastening force of a nut (not shown) attached to the screw portion c must be increased more than necessary.

<Object of the present invention> The present invention has been made in order to solve the above-mentioned problems, and provides a box structure bolt which can be easily attached to a material to be tightened without a collar attaching work. The purpose is to do.

<Means for Solving the Problems> That is, in the present invention, in a box structure bolt to be secured with a predetermined interval between surface-to-be-tightened members, a bolt mounting hole of one of the members to be tightened is used. A head having a large outer diameter, a flange formed on one end surface of the head, and having a larger outer diameter than the head, and a serration formed on the side of the flange opposite to the head, A welding flange member fitted to the serration portion and arranged around the serration portion and having an outer diameter larger than a bolt mounting hole of the other tightened member; and a side opposite to the flange portion side of the serration portion. And a shaft portion having an outer diameter smaller than the bolt mounting hole of the other tightened member, and having a threaded portion on a free end side, and an end surface of the head opposite to the flange portion side. An end surface of the head, on the side of the assembly portion. A bolt for box structure, wherein an axial length from the to the end portion of the welding flange to the shaft portion side is formed to be equal to an interval between the tightened members.

Further, the welding flange material is located on the flange portion side, a fitting flange fitted with the serration portion, and a welding flange located on the shaft portion side and having an outer diameter larger than the fitting flange. It is a box structural bolt consisting of:

Furthermore, the box-structured bolt has a thickness of the welding flange smaller than a thickness of the fitting flange.

<Embodiment> An embodiment of the present invention will be described below with reference to FIG.

<A> Overview of the overall shape of the bolt The bolt for box structure of the present invention is obtained by cold working one steel rod, and sequentially assembling part 101, head 102, flange 10 in the axial direction.
3, the serration portion 104, the shaft portion 105, and the screw portion 106 are formed into the bolt body 100, and the separately formed welding flange member 110 and the bolt body 100 are integrated, and the head 102 is assembled. The axial length from the end face on the part 101 side to the end face on the shaft part 105 side of the welding flange member 110 is formed to be equal to the interval between the tightened members D1 and D2. Hereinafter, a specific structure of each unit will be described.

<B> Bolt Main Body The head 102 is a columnar body or the like having an outer diameter larger than the bolt mounting hole E1 opened in the material D1 to be tightened.

The flange portion 103 is a disc-shaped body or the like formed on one end surface of the head portion 102 and having an outer diameter larger than the head portion 102.

As an example of the assembling part 101, the head 102 has an outer diameter smaller than the bolt mounting hole E1 of the tightened material D1 and is provided on the end face on the side opposite to the flange 103 side, and a screw is formed on the outer peripheral surface. The provided rod is used.

Although not shown, a steel rod protruding from the end surface of the head 102 on the side opposite to the flange portion 103 has an outer diameter smaller than the bolt mounting hole E1, and has a rectangular outer peripheral surface such as a hexagon. A structure having the same is also conceivable.

Although not shown, a steel bar protruding from the end face of the head 102 on the side opposite to the flange 103 side, having an outer diameter larger than the bolt mounting hole E1, and having a serration on the peripheral surface. Is also conceivable.

Further, although not shown, a structure in which a screw hole is formed in the end face of the head 102 on the side opposite to the flange 103 side is also conceivable.

The serration portion 104 is formed on the opposite side of the head portion 102 side of the flange portion 103, and has a large number of irregularities in the axial direction on the outer peripheral surface.

The shaft portion 105 is a columnar body or the like formed on the opposite side of the serration portion 104 from the flange portion 103 side and having an outer diameter smaller than the bolt mounting hole E2 formed in the tightened member D2.

The screw portion 106 is formed on the free end surface side of the shaft portion 105 and is used at the time of bolt fastening.

<C> Welding flange material The welding flange material 110 has an outer diameter larger than the bolt mounting hole E2 of the tightened material D2, and a single plate material may be used. It is good to use what integrated the.

In that case, it is located on the flange 103 side, and the serration 1
04 and a fitting flange 111, which is located on the shaft 105 side,
A welded flange 112 having an outer diameter larger than 111 is laminated, and they are welded by arc welding or the like (welded portion G1) to be integrated.

Since the outer diameter of the welding flange 112 is larger than the outer diameter of the fitting flange 111, the welding flange 112 is located annularly around the outer periphery of the fitting flange 111,
This portion is a welding area described later.

In addition, if the fitting flange 111 is formed to have a large thickness to secure the necessary rotation resistance of the bolt, the thickness of the welding flange 112 should be reduced to a minimum while leaving a thickness necessary for welding. Can be.

Bolt insertion holes 113 and 114 are formed in the center of the fitting flange 111 and the welding flange 112, respectively. Has an inner diameter larger than the outer diameter of the shaft portion 105.

Then, the bolt body 100 is inserted into the bolt insertion holes 113 and 114 from the screw portion 106 side, and the serration portion 104 is inserted into the insertion holes 11 and 114.
3 and the bolt body 100 and the welding flange 110 are integrated.

Each member is set in advance so that the axial length from the end surface of the head 102 to the mounting portion 101 side to the end surface of the welding flange 112 to the shaft portion 105 is equal to the interval between the tightened members D1 and D2. Determine the dimensions of

<Operation of the Present Invention> Next, a method for fastening a member to be tightened using the box structure bolt configured as described above will be described.

The tightened materials D1 and D2 are arranged facing each other, and the bolt mounting holes
The mounting portion 101 is inserted through E1, and the shaft portion 105 is inserted through the bolt mounting hole E2.

Then, the nut 200 is screwed and fastened to the assembly portion 101, and the welding flange 112 is fixed to the tightened member D2 by spot welding or the like (welded portion G2).

As a result, an interval equal to the axial length from the end face of the head portion 102 on the assembly part 101 side to the end face of the welding flange 112 on the shaft part 105 side is secured between the tightened members D1 and D2.

In addition, since the welding flange 112 is fixed to the material D2 to be tightened, the bolt has a sufficient rotation resistance.

When a steel rod having a rectangular outer peripheral surface is adopted as the assembling part 101, this steel rod is inserted into the bolt mounting hole E1, and swaged from its free end face side, and the tightened material D1 is used as the swaged part. It is fixed by being sandwiched by the end face of the head 102.

When a steel rod having a serration on the peripheral surface is employed, the steel rod is pressed into the bolt mounting hole E1 and fixed.

At this time, it is also conceivable to raise a flange at the periphery of the bolt mounting hole E1 to increase the contact area with the steel rod to increase the fixing force.

Furthermore, when a screw hole is drilled in the end face of the head 102,
This screw hole and the bolt mounting hole E1 are aligned, and a bolt can be screwed into the screw hole and fixed.

<Effects of the present invention> The present invention is as described above, and the following effects can be obtained.

(A) Since the conventional collar and bolt are formed integrally, there is no need to perform the collar mounting work separately from the bolt mounting work.

Therefore, the bolt mounting work is facilitated, and the workability can be improved.

(B) Since the bolt and the collar have an integral structure, the bolt is fastened to the material to be tightened, and the tightening force causes the collar portion including the head, the flange portion, and the flange material for welding, and the material to be tightened. Are firmly integrated with each other, ensuring the strength of the box and increasing the reliability of noise suppression.

(C) Since the welding flange is fixed to the material to be tightened, the rotation resistance of the bolt can be sufficiently secured.

(D) Conventionally, there is a type in which a serration portion provided on a bolt is press-fitted into a bolt mounting hole of a member to be tightened in order to secure the rotation resistance of the bolt.

However, in the case of the above-mentioned prior art, the plate thickness of the material to be tightened had to be increased in order to ensure a sufficient rotation resistance, and the design of the material to be tightened was limited.

On the other hand, according to the present invention, a sufficient rotation force can be secured by press-fitting the serration portion into the welding flange material and further welding it to the material to be tightened.

Therefore, since the serration portion is not directly pressed into the material to be tightened, the degree of freedom in designing the material to be tightened can be ensured.

(E) If the flange material for welding is divided into a fitting flange and a welding flange, and the thickness of the fitting flange is formed to be large to secure the required rotation resistance of the bolt, the plate thickness of the welding flange can be reduced by welding. The thickness can be reduced to a minimum while keeping the necessary thickness, and the cost can be reduced.

[Brief description of the drawings]

 FIG. 1: Illustration of an embodiment of the bolt of the present invention FIG. 2: Illustration of the prior art

Continuing on the front page (72) Inventor Hidetoshi Imanaga 2-38-4 Minamihanahata, Adachi-ku, Tokyo (72) Inventor Masamitsu Takano 19-1 Gomijima, Fuji-shi, Shizuoka Prefecture Inside Yamakawa Industry Co., Ltd. (72) Inventor Katsumi Nakamura 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan Motor Co., Ltd. (56) References JP-A-57-103921 (JP, A) JP-A-56-167912 (JP, A) (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 1. A bolt for a box structure which is attached with a predetermined interval between surface-to-be-tightened members to be secured, comprising: a head having an outer diameter larger than a bolt mounting hole of one of the members to be tightened; A flange formed on one end surface of the head and having an outer diameter larger than the head; a serration formed on the side of the flange opposite to the head; a serration fitted with the serration; And a welding flange member having an outer diameter larger than a bolt mounting hole of the other tightened member, formed on the opposite side of the serration portion from the flange portion side,
A shaft portion having an outer diameter smaller than the bolt mounting hole of the other member to be tightened and having a threaded portion on a free end side; and a set provided on an end surface of the head portion opposite to the flange portion side. And a length in the axial direction from the end face on the side of the assembly part of the head to the end face on the shaft side of the welding flange is formed to be equal to the interval between the tightened members. Constructed, box structural bolts. 2. The welding flange material is located on the flange portion side,
The box structure bolt according to claim 1, further comprising: a fitting flange fitted to the serration portion; and a welding flange located on the shaft portion side and having an outer diameter larger than the fitting flange. 3. The box structure bolt according to claim 2, wherein the thickness of the welding flange is smaller than the thickness of the fitting flange.