JPH06166123A - Production of universal member - Google Patents

Abstract

PURPOSE:To solve the lack of the fittness and free rotational properties of outer and inner diameter member which are defects of a conventional universal joint and the complicatedness of a manufacturing process and to achieve the strong fittness and free rotation of the outer and inner diameter members by a simple manufacturing process. CONSTITUTION:When a universal member 1 is manufactured, a removable film 4 with a predetermined thickness is preliminarily formed on the surface of an inner diameter member 2 and, after an outer diameter member 3 is integrally molded along with the inner diameter member 2, the film 4 is removed to provide a clearance making the inner diameter member 2 freely slidable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of a universal member which is used for a mechanical part such as an automobile, a mechanical part for transportation, or an artificial joint member and which is excellent in weight reduction and vibration absorption.

[0002]

2. Description of the Related Art When an inner diameter member and an outer diameter member are independently molded individually, and when the inner diameter member is press-fitted into the outer diameter member, a slit is provided to facilitate press fitting, and the outer diameter member is heated and expanded. On the other hand, a method of press-fitting each other with the inner diameter member cooled and shrunk, or by inserting the inner diameter member into the slit outer diameter member and further inserting the outer diameter member into the metal member and then caulking the metal member into the inner diameter member Measures have been taken to prevent falling.

[0003]

The conventional method for manufacturing a plastic universal joint is as described above, and the outer diameter member and the inner diameter member are independently molded separately,
A method in which a slit is provided in the outer diameter member and the elasticity or heat expansion and cooling contraction of the outer diameter member is used to press fit and form a resin further on the outside after press fitting, or to insert into a metal member and crimp and hold the end face. Alternatively, the outer diameter member is heated and expanded, the inner diameter member is cooled and shrunk, and press-fitted, and then the inner diameter member is held by heat shrinkage of the outer diameter member by heat treatment.

However, a slit is provided in the outer diameter member,
When the dimensional difference between the thermal expansion of the outer diameter member, the cooling shrinkage of the inner diameter member and the contraction of the outer diameter member due to the subsequent heat treatment is used, the fitting force is weak and the inner diameter member is easily pulled out from the outer diameter member, limiting the range of use. . Further, when the metal member is further fitted to the outer diameter member and the metal member is made by the caulmer method, the shape becomes large and the man-hours increase correspondingly, which is expensive.

According to the present invention, in addition to the drawbacks of the conventional universal joint as described above, the fitting of the outer diameter member and the inner diameter member, that is, the pulling force is reduced, the lack of rotatability between the two, etc. The object of the present invention is to solve the complexity of the above, and to achieve a firm fitting and free rotation of the outer diameter member and the inner diameter member by a simple manufacturing process.

[0006]

Means for Solving the Problem and Its Action The structure of the present invention will be described below with reference to the drawings. According to the present invention, as described above, the inner diameter member 2 has a spherical surface or a partial spherical surface, and the outer diameter portion 3 covers a part or the whole of the spherical surface so that the inner diameter member and the outer diameter member can freely slide. Universal joint 1
At the time of manufacturing, a film 4 is formed on the spherical surface of the inner diameter portion 2 with a thickness that allows the inner diameter member 2 to hold a rotatable clearance 5 relative to the outer diameter member 3 due to a substance that is dissolved by a solvent, decomposed by microorganisms such as bacteria, or sublimable. After being formed by coating, it is inserted into the mold cavity and the outer diameter member 3 is integrally injection-molded, and then the film 4 formed by molding the molded product is removed by an appropriate method depending on the property. It is characterized in that a clearance is provided so that it can move freely.

Membrane materials used in the present invention include methoxymethylated nylon, copolymer type nylon, polyvinyl butyral, paradichlorobenzene, copolymer of acrylic acid and acrylate, polyvinyl alcohol, dextrin, Examples thereof include gelatin, starch, synthetic water-soluble polymers and the like, and mixtures thereof. In order to accelerate elution, use of ultrasonic waves, or an inorganic substance (glass spheres, calcium carbonate, electrolyte), etc. in the membrane material is added to the membrane material at
It is possible to shorten the sublimation elution time by adding 200 parts by weight to reduce the absolute amount of the sublimation and solvent elution film material.

[0008]

【Example】

Example 1 An inner diameter member was used as a phenol resin molding, and the outer surface thereof was immersed in a 17 wt% aqueous solution (13000 cps) of polyvinyl alcohol (Kuraray's Poval degree of polymerization 1700) and dried in a drying oven at 50 ° C. After drying, this inner diameter member is inserted into a mold to be used as an outer diameter member, and polyphenylene sulfide is injection-molded. Then, the integrated inner diameter member and outer diameter member are put into an ultrasonic cleaning machine using hot water at a temperature of 60 ° C., and polyvinyl alcohol is eluted to form a clearance in which the inner diameter member and the outer diameter member can freely move. I was able to do it.

Example 2 A steel ball was used as the inner diameter member, and the outer surface thereof was immersed in the polyvinyl alcohol aqueous solution described in the first embodiment and dried in a drying oven at 50 ° C., and then the inner diameter member was inserted into a mold. -Aromatic polyamide is injection-molded as the outer diameter member. Then, the integrated inner diameter member and outer diameter member are put into an ultrasonic cleaning machine using hot water at a temperature of 60 ° C., and polyvinyl alcohol is eluted to form a clearance in which the inner diameter member and the outer diameter member can freely move. I was able to do it.

[0010]

In the universal member according to the present invention, an inner diameter member is formed, and the inner diameter member surface is formed of a membrane material which can be dissolved by a sublimable substance or solvent, or decomposed by microorganisms such as bacteria. After inserting into the mold to integrally mold the outer diameter member, the membrane material formed on the inner diameter member is sublimated, eluted with solvent, or decomposed by bacteria to provide an appropriate clearance. No need for press-fitting and peripheral caulking steps after molding both separately into the inside, and since the slit is made in the outer diameter member and expanded, the inner diameter member is not inserted and the outer diameter member is not put in the metal housing. The force to pull out the member from the outer diameter member can be increased, and the economic effect due to the simplification of the process is also very large.

[Brief description of drawings]

FIG. 1 is a process drawing of the present invention.

[Explanation of symbols]

 1 Universal member 2 Inner diameter member 3 Outer diameter member 4 Coating film 5 Clearance

Claims (4)

[Claims] 1. An inner diameter member for manufacturing a universal member capable of freely sliding an inner diameter member having a total spherical surface or a partial spherical surface and an outer diameter member covering a part or all of the inner diameter member. A removable film having a predetermined thickness is formed on the surface in advance, and after that, the outer diameter member and the inner diameter member are integrally formed, and then the film is removed to provide a clearance in which the inner diameter member can freely move. Characteristic universal member manufacturing method. 2. The method for producing a universal member according to claim 1, wherein the surface of the inner diameter member is formed with a film made of a sublimable substance or a material that can be eluted and decomposed by a solvent or a microorganism such as a bacterium. 3. The method for producing a universal member according to claim 1, wherein when the film material formed on the surface of the inner diameter member is eluted and removed, the film material is filled with an inorganic filler. 4. The method for producing a universal member according to claim 1, wherein ultrasonic waves are used when the film formed on the surface of the inner diameter member is eluted and removed by a solvent.