JPH079277A - Rod pressure fit shaping item, rod for it, and method for pressure fitting - Google Patents

Abstract

PURPOSE:To prevent a rod from being put in pressure attachment to a boss part in the condition that it is plastically deformed obliquely when pressure fit of the rod to the boss part takes place while the axis of the rod is inclining to the axis of the boss part any slightly. CONSTITUTION:A rod guide part 2A has an inside diameter d1 approx. the same size as the outside diameter d2 of a rod to be pressure fitted 3 and is to locate the axis 02 of the rod 3 identical to the axis 01 of the boss part 2 of a shaping item 1 by inserting the rod 3 a certain length into the boss part 2 toward a backmore part therein from its inlet, and therein a rod pressure fit part 2C having a smaller inside diameter than the guide part 2A is formed for pressure fitting of the rod 3 to backmore in it 2A.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can suitably perform press fitting of a rod material (shaft, rod, etc.) into a boss portion formed in a molded product (metal plate molded product, cast molded product, resin molded product, etc.). The present invention relates to a bar press-fitting molded product, a molded product press-fitting bar, and a bar press-fitting method.

[0002]

2. Description of the Related Art Conventionally, when a bar material is press-fitted into a boss portion formed on the above-mentioned molded article, a molded article 10 having a boss portion 11 is set on a pedestal 12 as shown in FIG. A bar member 13 having an outer diameter D2 slightly larger than the inner diameter D1 was forcibly pushed into the boss portion 11 with a press-fitting machine and press-fitted.

[0003]

However, the boss portion 11
When the rod member 13 is press-fitted to the shaft 12, if the axis O2 of the rod member 12 is press-fitted with a slight inclination with respect to the axis O1 of the boss portion 11,
As shown in FIG. 6, the boss portion 11 is plastically deformed obliquely, and there is a problem that the bar material 13 is pressure-bonded to the boss portion 10 in this oblique state.

In view of such circumstances, it is an object of the present invention to provide a rod material press-fitting molded article, a molded article press-fitting rod material, and a method for pressing these rod materials, which can prevent the above problems.

[0005]

According to a first aspect of the present invention, there is provided a rod press-fitting molded article, wherein the rod is placed on the boss portion from the entrance of the boss portion into which the rod is inserted. By inserting a predetermined length, the rod guide part of which the axis of the rod is aligned with the axis of the boss is approximately the same as the outer diameter of the rod.
A bar material press-in portion having an inner diameter smaller than that of the bar material guide portion into which the bar material is press-fitted is formed on the inner side of the bar material guide portion.

Further, claim 2 for achieving the above object.
In the rod material press-fitting method of the invention according to the above, a rod material guide portion having substantially the same size as the outer diameter dimension of the rod material is formed from the entrance of the boss portion toward the inner side, and at the back side of the rod material guide portion. A bar material press-fitting part having a smaller inner diameter than the bar material guide part for press-fitting the bar material is formed,
A rod is inserted from the inlet of the rod guide portion for a predetermined length to match the axis of the rod with the axis of the boss, and then the rod is press-fitted into the rod press-fitting portion.

A third aspect of the present invention for achieving the above object.
The molded product press-fitting rod material of the invention according to claim 1 makes the axis of the rod material coincide with the axis of the boss portion by inserting the rod material into the boss portion over a predetermined length in the axial direction. A guide portion having an outer diameter substantially the same as the inner diameter of the boss portion is formed, and a press-fit portion having a larger outer diameter than the guide portion press-fitted into the boss portion is formed on the inner side of the guide portion.

A fourth aspect for achieving the above object.
In the rod material press-fitting method according to the invention, a guide portion having an outer diameter substantially the same as the inner diameter dimension of the boss portion is formed on the rod material over a predetermined length in the axial direction, and the guide portion is formed. Is inserted from the inlet of the rod for a predetermined length so that the axis of the bar and the axis of the boss match, and then the press-fitting part of the bar having an outer diameter larger than that of the guiding part is press-fitted into the boss. .

[0009]

According to the rod material press-fitting molded product of the invention according to claim 1 and the rod material press-fitting method of the invention according to claim 2, the outer diameter dimension of the bar material is substantially the same from the entrance of the boss portion to the back. Since the bar guide part of the dimensions is formed, when the bar is inserted from the entrance of the boss for a predetermined length, the axis of the bar and the axis of the boss are aligned without plastically deforming the boss diagonally. Therefore, by continuously pushing the rod into the rod press-fitting portion of the boss, the rod can be press-fitted straight into the boss.

According to the molded product press-fitting rod material of the invention according to claim 3 and the rod-material press-fitting method of the invention according to claim 4, the boss portion is formed on the rod material over a predetermined axial length. Since a guide part with an outer diameter that is almost the same as the inner diameter is formed,
When the guide part of the bar is inserted from the entrance of the boss for a predetermined length,
The axis of the rod and the axis of the boss are aligned without plastically deforming the boss diagonally.Therefore, pressing the rod into the boss continuously pushes the rod straight into the boss. be able to.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part of a bar press-fitted molded product and a bar, showing an embodiment of the invention according to claims 1 and 2.

In FIG. 1, reference numeral 1 denotes a molded product made of a metal plate, casting, resin or the like (for example, a sheet metal pulley, a fluid chamber component used in an automobile primer cylinder, etc.), and 2 denotes a wall portion 1A of the molded product 1. The cylindrical boss portion 3 and the cylindrical boss portion 3 integrally formed with the boss portion 3 are circular rods made of a shaft, a rod, and the like that are press-fitted into the boss portion 2.

The inner diameter of the boss portion 2 is slightly larger than the outer diameter dimension d2 of the rod material 3 (that is, substantially the same as the outer diameter dimension d2 of the rod material 3) from the entrance into which the rod material 3 is inserted to the inner side. d
The rod guide portion 2A of No. 1 is formed, and by inserting the rod material 3 into the rod guide portion 2A by a predetermined length, the axis O2 of the rod material 3 and the boss portion 2 can be formed without deforming the boss portion 2. Axis O1
I try to match.

Further, a diameter-reduced annular portion 2B inclined inward in the radial direction is formed on the inner side of the bar-material guiding portion 2A, and the diameter-reduced annular portion 2B further forms the bar material on the inner side. When the bar 3 is press-fitted into the press-fitting portion 2C, the bar 3 can be easily and straightly press-fitted.

The inner diameter d3 of the rod press-fitting portion 2C is smaller than the inner diameter of the rod guiding portion 2A and slightly smaller than the outer diameter d2 of the rod 3.

By the way, the axial length L1 forming the rod guide portion 2A is 1 / L with respect to the total length L of the boss portion 2.
It is preferable to set it to 4 to 1/2, preferably about 1/3. When the length is less than 1/4, the axis O2 of the rod 3 and the boss 2
Is easily pressed in when the axis O1 of
This is because if the length exceeds 2, the pressure bonding between the bar 3 and the bar press-fitting portion 2C tends to be insufficient.

Next, a method for press-fitting the rod 3 into the molded product 1 will be described. First, the molded product 1 is shown in FIG.
As shown in FIG. Next, the rod 3 is inserted into the rod guide portion 2A of the boss portion 2 as shown in FIG. 2B by a press-fitting machine (not shown). As a result, the axis O of the bar 3 is
2 and the axis O1 of the boss portion 2 are aligned with each other. Subsequently, the bar 3 is further pushed by the press-fitting machine to press it into the bar press-fitting portion 2C of the boss portion 2 as shown in FIG. 2 (C). As a result, the rod 3 can be pressed straight into the rod press-fitting portion 2C of the boss 2 without plastically deforming the boss 2 obliquely.

FIG. 3 is a cross-sectional view of the essential parts of a molded product press-fitting rod and a molded product showing an embodiment of the invention according to claims 3 and 4.

In FIG. 3, reference numeral 4 denotes a molded product made of a metal plate, casting, resin or the like (for example, a pulley made of a sheet metal, a fluid chamber component used in an automobile primer cylinder, etc.), and 5 denotes a wall portion 4A of the molded product 4. A cylindrical boss portion 6 formed integrally with the boss portion 6 is a circular rod member including a shaft, a rod, and the like that are press-fitted into the boss portion 5.

The outer diameter of the end of the rod 6 is slightly smaller than the inner diameter d4 of the boss 5 (that is, substantially the same as the inner diameter d4 of the boss 5) over a predetermined axial length. A guide portion 6A of d5 is formed, and by inserting the guide portion 6A into the boss portion 5 for a predetermined length, the axis O2 of the bar 6 and the axis O1 of the boss portion 5 are aligned without deforming the boss portion 5. I am trying to let you.

Further, on the inner side of the guiding portion 6A, there is formed an enlarged diameter annular portion 6B which is inclined outward in the radial direction, and by this enlarged diameter annular portion 6B, a press-fitting portion 6C formed further on the inner side is formed. When press-fitting into the boss portion 5, the press-fitting portion 6C can be easily and straightly press-fitted into the boss portion 5.

The outer diameter d6 of the press-fitting portion 6C is larger than the guiding portion 6A and slightly larger than the inner diameter d4 of the boss portion 5.

By the way, the axial length L2 forming the guide portion 6A of the rod 6 is set to 1/4 to 1/2, preferably about 1/3 of the total length L of the boss portion 5. You had better stay. If the length is less than ¼, the axis O2 of the rod 6 and the axis O1 of the boss portion 5 are likely to be press-fitted in a state where they do not coincide with each other.
This is because if the length exceeds / 2, the pressure bonding between the rod 6 and the boss portion 5 tends to be insufficient.

Next, a method for press-fitting the rod 6 into the molded product 4 will be described. First, the molded product 4 is shown in FIG.
As shown in FIG. Next, the guide portion 6A of the rod 6 is inserted into the boss portion 5 as shown in FIG. 4 (B) with a press-fitting machine (not shown). As a result, the axis O2 of the bar 6 and the axis O1 of the boss portion 5 are aligned. Subsequently, the rod 6 is further pushed by the press-fitting machine to press the press-fitting portion 6C of the rod 6 into the boss portion 5 as shown in FIG. 4 (C). As a result, the rod member 6 can be press-fitted straight into the boss portion 5 without plastically deforming the boss portion 5 obliquely.

In the above embodiment, the case where the end portion of the bar material is press-fitted into the boss portion has been described. Of course, the end portion side of the bar material has a small diameter that passes through the boss portion, and It goes without saying that the present invention can be applied even when the intermediate portion is press-fitted into the boss portion.

[0026]

As described above, according to the inventions of claims 1, 2, 3 and 4, the rod can be press-fitted straight into the boss portion without plastically deforming the boss portion obliquely. It is possible to prevent the problem that the rod member and the boss portion are crimped in a state of being deformed obliquely. In addition, since it is easy to process into a molded product or a bar material, the practical effect is very large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a rod press-fitting molded product and a rod, showing an embodiment of the invention according to claim 1.

FIG. 2 is an explanatory view of a rod press-fitting method showing an embodiment of the invention according to claim 2;

FIG. 3 is a cross-sectional view of the essential parts of a molded product and a molded product press-fitting rod showing an embodiment of the invention according to claim 3;

FIG. 4 is an explanatory view of a rod material press-fitting method showing an embodiment of the invention according to claim 4;

FIG. 5 is a cross-sectional view of an essential part showing a conventional rod press-fitting molded product and a rod.

6 is a cross-sectional view of essential parts when a bar is press-fitted into the bar press-fitted molded product of FIG.

[Explanation of symbols]

 1,4 Molded product 2,5 Boss part 3,6 Bar material 2A Bar material guiding part 2C Bar material press fitting part d1 Bar material guiding part inner diameter d2 Bar material outer diameter d3 Bar material pressing part inner diameter 6A Guide part 6C Press fitting Part d4 Boss inner diameter d5 Guide part outer diameter d6 Press fit part outer diameter O1 Boss axis O2 Bar material axis

Claims (4)

[Claims] 1. In a molded article having a boss portion into which a rod is press-fitted, from the entrance of the boss portion into which the rod is inserted toward the back,
By inserting the rod material into the boss portion for a predetermined length, a rod material guide portion is formed that has approximately the same outer diameter dimension as the rod material that matches the axis line of the rod material with the axis line of the boss portion. A bar material press-formed product, characterized in that a bar material press-in portion having an inner diameter smaller than that of a bar material guide portion for press-fitting a bar material is formed on the inner side. 2. A method for press-fitting a bar into a boss formed in a molded product, wherein a bar guide having a size substantially the same as the outer diameter of the bar is formed from the entrance of the boss toward the back. In addition, a bar material press-fitting part having a smaller inner diameter than the bar material guiding part for press-fitting the bar material is formed on the inner side of the bar material guiding part, and the bar material is provided with a predetermined length from the inlet of the bar material guiding part. A rod material press-fitting method, characterized in that an axis line of a rod material is aligned with an axis line of a boss portion by inserting the rod material, and then the rod material is press-fitted into the rod material press-fitting portion. 3. A rod material which is press-fitted into a boss portion formed in a molded product, wherein the rod material is inserted into the boss portion by a predetermined length over a predetermined axial length, and thereby the axis line of the rod material is inserted. Align the axis of the boss with the inner diameter of the boss, and form a guide part with an outer diameter that is almost the same as the inner diameter of the boss. A press-fitted bar for a molded product, characterized in that 4. A method for press-fitting a rod into a boss formed in a molded product, wherein the rod has a guide portion having an outer diameter substantially the same as the inner diameter of the boss over a predetermined axial length. The guide part is inserted from the entrance of the boss part for a predetermined length so that the axis of the bar and the axis of the boss part are aligned, and then the press-fit part of the bar with a larger outer diameter than the guide part is inserted. A method of press-fitting a bar material, characterized in that the press-fitting is performed in the boss portion.