JPH1071650A - Manufacture of propeller shaft made of frp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a heating time and to omit labor setting an FRP cylindrical body. SOLUTION: An intermediate member 2 made of a rubber is preliminarily bonded to the outer periphery of each of yoke members 1 by vulcanization and, subsequently, the yoke members 1 are inserted into an FRP cylindrical body 3 from both ends thereof under pressure so as to interpose a heat reactive type adhesive between the yoke members and the cylindrical body and an electrode 4 is arranged to the outer periphery of the central part of the FRP cylindrical body 3 while electric discharge preventing members 6 are respectively arranged to the outer peripheries of both end parts of the FRP cylindrical bodies 3. Thereafter, high frequency voltage is applied across the electrode 4 and the yoke members 1 to generate heat in the intermediate members 2 and the adhesive is reacted to mutually bond the FRP cylindrical body 3 and the intermediate members 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a propeller shaft made of FRP (fiber reinforced plastic), and more particularly, to a method of joining an FRP cylindrical body and a metal yoke member via a rubber intermediate member. About.

[0002]

2. Description of the Related Art As is well known, propeller shafts made of FRP have advantages such as lighter weight and superior corrosion resistance as compared with those made of steel pipes. Is being promoted. However,
Even though the shaft portion of the propeller shaft can be made into FRP, the yoke portions at both ends to be connected to the mating shaft portion cannot be made into FRP due to its function. Shall be taken. For this reason, a different material joining technique for joining the FRP shaft and the metal yokes at both ends of the shaft is required.

Since FRP cannot be welded, an epoxy adhesive, that is, an adhesive that cures at a relatively low temperature of about room temperature to about 100 ° C., is generally used for bonding to the mating member. When FRP and metal are bonded using this adhesive, even if the initial bonding strength is high, the thermal expansion coefficients of the two are significantly different, so if expansion and contraction are repeated, cracks will occur in the bonded part due to aging. Then, there is a great possibility that the reliability of the joint is reduced.

Therefore, the present inventors did not directly join the FRP shaft portion and the metal yoke member, but interposed a rubber intermediate member (insulator) between them. A technology has been developed to absorb the difference in expansion and contraction between the shaft portion and the yoke member by means of a rubber intermediate member (Japanese Patent Laid-Open No. Hei 6 (1994)).
-134870 and JP-A-6-278210).

Next, an example of a method of manufacturing a propeller shaft according to this technique will be described with reference to FIGS. As shown in FIG. 2, a plurality of ring-shaped rubber intermediate members 2 are bonded to the outer periphery of the yoke member 1 in advance by vulcanization.
Then, after applying a heat-reactive adhesive to the inner peripheral surface of the FRP cylinder 3, the yoke members 1 are pressed into the FRP cylinder 3 from both ends. Next, after the semi-cylindrical electrode 4 is disposed in contact with the outer periphery of the end of the FRP cylinder 3, the electrode 4 and the yoke member 1 are
A high frequency voltage is applied in between. Then, the intermediate member 2 is subjected to high-frequency dielectric heating by the electric field generated between them, and the heat is applied to activate the adhesive, so that the FRP cylinder 3 and the intermediate member 2 are joined to each other.

[0006]

However, in such a method, after the heating of one end of the FRP cylinder 3 is completed,
The other end must be heated by inverting the RP cylinder 3 by 180 °, not only increasing the heating time but also the FRP
The setting of the cylinder 3 also requires time and effort, and the production efficiency becomes very poor.

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a method of manufacturing a propeller shaft made of FRP, which can shorten the heating time and save the trouble of setting the FRP cylinder.

[0008]

According to the present invention for solving the above-mentioned problems, an intermediate member made of rubber is preliminarily vulcanized and bonded to the outer periphery of a yoke member, and then the yoke member is connected to an FR.
A heat-reactive adhesive is interposed from both ends of the P cylinder and press-fitted into the inside, and electrodes are arranged on the outer periphery of the central part of the FRP cylinder, while the discharge preventing members are arranged on the outer periphery of both ends of the FRP cylinder. After that, the high-frequency voltage is applied between the electrode and the yoke member to generate heat in the intermediate member, and the adhesive reacts to join the FRP cylinder and the intermediate member to each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing an FRP propeller shaft according to the present invention will be specifically described with reference to FIGS. In the present invention, as in the prior art, a plurality of ring-shaped rubber intermediate members 2 are vulcanized and bonded to the outer periphery of the yoke member 1 and a heat-reactive adhesive is applied to the inner peripheral surface of the FRP cylinder 3. After that, the yoke member 1 is
Each of the P cylinders 3 is press-fitted into the inside from both ends (see FIG. 2).

Next, as shown in FIG. 1, a semi-cylindrical electrode 4 is arranged on the outer periphery of the central portion of the FRP cylinder 3 while the FRP cylinder 3 is in contact therewith.
After the semi-cylindrical discharge prevention members 6 are respectively disposed on the outer periphery of both ends of the RP cylinder 3, a high-frequency voltage is applied between the electrode 4 and the yoke member 1 while rotating the FRP cylinder 3 by the motor 5. I do. As a result, an electric field is generated between the electrode 4 and the yoke members 1, 1, and the intermediate member 2 is subjected to high-frequency dielectric heating. The adhesive is activated by receiving the heat, and bonds the FRP cylinder 3 and the intermediate member 2 to each other. The discharge prevention member 1 may be made of Teflon-based material such as polytetrafluoroethylene.

In such a method, the distance between the electrode 4 and the yoke member 1 increases, and in order to obtain a sufficient electric field strength, the voltage applied to the electrode 4 must be increased. Electric discharge occurs between the electrode 4 and the yoke member 1, and the surface of the FRP cylinder 3 is heated. Therefore, the discharge prevention members 6 are provided at both ends of the FRP cylinder 3.
Are arranged to prevent the occurrence of discharge. Note that an insulating spacer (not shown) is attached to the inner surface of the electrode 4 to prevent excessive heating of the FRP cylinder 3.

[0012]

EXAMPLE In this example, an intermediate member 2 having a composition shown in Table 1 was bonded to a yoke member 1 by vulcanization. The FRP cylinder 3 is made of an epoxy resin as a matrix and has a carbon fiber volume content of 60%, and has an inner diameter of 82.6 mm, a wall thickness of 3.1 mm, and a length of 1200 mm. processed. An increase in the content of carbon fibers is preferable because the conductivity is improved, but is disadvantageous in terms of cost and moldability, so 30 to 70% may be appropriate. As the adhesive, Chemlock # 205 manufactured by Road Co., Ltd. was used for the overcoat, and Chemlock # 252 manufactured by the company was used for the undercoat.

[0013]

[Table 1]

Then, the yoke member 1 is press-fitted from both ends of the FRP cylinder 3 into the inside thereof, and as shown in FIG.
After the electrode 4 and the discharge preventing members 6, 6 were respectively placed in contact with the P cylinder 3, a high frequency voltage was applied to the electrode 4 to heat the intermediate member 2 by high frequency dielectric heating. The electrode 4 was 6 mm thick and 200 mm long, and the discharge preventing member 6 was 5 mm thick and 40 mm long. As a comparative example, a similar sample was heated by the method shown in FIG. After heating for a predetermined time, it was cooled to room temperature, a static torsion test was performed at a rate of 5 deg / min, and then the sample was cut to examine the joint state between the intermediate member 2 and the FRP cylinder 3. As shown in Table 2, it was confirmed that the heating time and the setting time were significantly shortened without impairing the static torsional strength and the joining state as compared with the comparative example.

[0015]

[Table 2]

[0016]

According to the present invention, since both ends of the FRP cylinder can be heated at the same time, the heating time can be reduced,
The labor of FRP cylindrical body setting can be saved.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually illustrating the method of the present invention.

FIG. 2 is a diagram illustrating a method of assembling a yoke member to an FRP cylinder.

FIG. 3 is a diagram conceptually showing a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Yoke member 2 ... Intermediate member 3 ... FRP cylinder 4 ... Electrode 6 ... Discharge prevention member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B29K 307: 04 B29L 31:06

Claims (1)

[Claims] An intermediate member made of rubber is vulcanized and bonded to an outer periphery of a yoke member in advance, and then the yoke member is
A heat-reactive adhesive is interposed from both ends of the RP cylinder and press-fitted into the inside, and electrodes are arranged on the outer periphery of the central portion of the FRP cylinder, while discharge prevention members are arranged on the outer periphery of both ends of the FRP cylinder. FRP is characterized in that a high frequency voltage is applied between the electrode and the yoke member to generate heat in the intermediate member, and the adhesive reacts to join the FRP cylinder and the intermediate member to each other. Method of manufacturing propeller shaft made of.