JPH0522826U - Mounting boss - Google Patents

Abstract

(57) [Summary] [Purpose] This is for producing a female screw 21 for tightening a bolt on an aluminum plate 1. Using the mounting boss 2, it is possible to insert a female screw without using the conventional aluminum brazing work. The binding force of the tightening rotation of 21 is obtained. [Structure] An aluminum screw having a female thread 21 to be inserted into and fixed to the through hole 11 of the aluminum plate 1 and having a concavo-convex portion 23 such as a selection 23A having an alumite coating 25 formed on the outer surface thereof and having a tightening margin. Mounting boss.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a female screw formed on an aluminum plate for bolting and fixing an aluminum mounting boss on which the female screw is formed.

[0002]

[Prior Art]

 Conventionally, when fixing the mounting boss with a female screw to the aluminum plate, as shown in FIG. 3, after inserting the insertion portion 202 of the aluminum mounting boss 20 into the aluminum plate 1, the tip surface of the insertion portion 202 is inserted. The end surface of the aluminum plate 1 and the end surface of the aluminum plate 1 were brazed with aluminum brazing material 3A. At that time, it was necessary to keep the aluminum plate 1, which is the base material, at a considerably high temperature.

[0003]

[Problems to be solved by the device]

 When high temperature heating and cooling in the brazing of the aluminum plate 1 are repeated, the aluminum plate 1 is distorted by thermal stress, which causes a large warp deformation. In addition, since the flow of molten brazing metal is insufficient and there is a minute gap in the brazing part to keep the watertightness, the surface of the aluminum plate 1 on the opposite side and the entire lower end of the head of the mounting boss 20 are separately provided. There was a drawback that the outer periphery had to be covered with the overlay 3B by aluminum brazing, and yet it was difficult to achieve watertightness.

[0004]

[Means for Solving the Problems]

 A mounting boss according to the present invention will be described with reference to FIGS. 1 and 2 showing an embodiment of the present invention.

The insertion portion 22 of the aluminum mounting boss 2 is press-fitted into the aluminum plate 1, and the outer surface is preliminarily anodized, and the concave and convex portions 23 having a high hardness alumite coating 25 are formed. The projection 23A in the axial direction is fitted into the aluminum plate 1 so as to engage with the aluminum plate 1, and a reaction force is generated in the circumferential direction by a torsional force to restrain the torsional force and the mounting boss 2 is prevented from rotating. To be done. When the concave-convex portion 23 is the knurled portion 23B, the slanted protrusion is fitted into the aluminum plate 1 and the mounting boss 2 is similarly prevented from rotating.

[0006]

[Action]

 When the concave-convex portion 23 formed on the outer periphery of the insertion portion 22 of the mounting boss 2 is the selection portion 23A, when a twisting rotational force acts on the side surface of the protrusion that bites into the aluminum plate 1 in the axial direction, A reaction force is generated in the direction to restrain the torsional rotation force, and the mounting boss 2 is prevented from rotating, and in the case of the knurl 23B, a reaction force is generated in the circumferential direction on the side surface of the projection extending obliquely. Similarly, the mounting boss 2 is prevented from rotating. Since the alumite coating 25 has high hardness and high strength, a large reaction force in the circumferential direction can be obtained on the protrusion. Of course, since the binding force in the circumferential direction at the outermost circumference of the insertion portion 22 is also held, the binding force of the torsional rotational force increases.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 is an aluminum plate, 2 is an aluminum mounting boss that is mounted and fixed to the aluminum plate 1, and a female screw 21 for tightening is formed. In addition, the aluminum plate 1 has a diameter smaller than the head portion of the insertion portion 22 by a step portion 24, and an axially extending selection 23A, which is an uneven portion 23, is formed on the outer circumference of the aluminum plate 1. The outer diameter of the insertion hole 22 is slightly larger than the diameter of the through hole 11 of the aluminum plate 1, and the insertion portion 22 is press-fitted into the through hole 11 of the aluminum plate 1. Reference numeral 25 denotes an alumite film formed in advance on the outer surface of the mounting boss. The alumite coating 25 imparts high hardness, high strength, and corrosion resistance to the mounting boss 2. (See Fig. 1.) Then, when the protrusion bites into the aluminum plate 1 and the tightening bolt is screwed into the female screw, the torsional rotational force received acts on the side surface of the protrusion and the same reaction force is generated. The rotative force of the mounting boss 2 is held in a bundle. Therefore, in addition to the frictional force at the outermost periphery of the protrusion, a restraining force for torsional rotation is added at the side surface, and the tightening force of the tightening bolt can be increased. Further, since the insertion portion 22 is less likely to be crushed at the time of press-fitting and has corrosion resistance, the rotational constraining force of the mounting boss 2 is kept large.

Next, in the concavo-convex portion 23 in FIG. 2, a knurled portion 23B is formed in which concave grooves intersecting with the left and right diagonal directions of the outer peripheral portion are formed, and a projection portion extending in the diagonal direction is formed. Yes, the protrusion of the knurled portion 23B bites into the aluminum plate 1, and the above-mentioned rotational force acts on the side surface of the protrusion that extends obliquely, and a reaction force of the same magnitude as the above is generated and received. The large torsional rotating force of the mounting boss 2 is restrained and held. Other parts that are the same as those in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted.

[0010]

[Effect of the device]

 The mounting boss according to the present invention has a structure in which a projection having an alumite coating such as a selection or knurling, which is an uneven portion formed in the insertion portion, is press-fitted and fixed in the through hole of the aluminum plate, so that it is twisted. An increase in the binding force of rotation, that is, the bolt tightening force can be measured. Therefore, it is free from the conventional difficult aluminum brazing work and is not subject to the high heat as in the brazing work, so there is no drawback that large warp deformation occurs due to thermal stress, and the seal material is not used. If it is applied before press-fitting into the through hole of the insertion part, it will fill the gap between the aluminum plate and the mounting boss in the circumferential direction without any gap, and it will be possible to easily add watertightness and achieve a significant cost reduction. It can be said to be useful.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing another embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a conventional example.

[Figure 4]

[Explanation of symbols]

 1 Aluminum Plate 11 Through Hole 2 Mounting Boss 21 Female Thread 22 Insertion Part 23 Concavo-convex Part 23A Selection Part 23B Rollet Part 25 Anodized Film

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[Procedure amendment]

[Submission date] September 8, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 4

[Correction method] Delete

Claims (1)

[Scope of utility model registration request] 1. An internal thread 2 fixed to an aluminum plate 1 and fixed thereto.
1 is formed of an aluminum boss 2 having a selection 23A or a knurl 23B formed on the outer periphery of the insertion portion 22 and having a slight interference with the diameter of the through hole 11 of the aluminum plate 1. A mounting boss having a diameter dimension and having an alumite coating 25 formed on the outer surface.