JPH01126412A - Manufacture of fiber reinforced resin made transmission pipe - Google Patents

Abstract

PURPOSE:To improve the reliability of strength without any machining of tapered portion by using a mandrel with tapered portions and forming fiber reinforced layers on the outer periphery thereof. CONSTITUTION:Auxiliary mandrels 5 with tapers are fixed outwardly on both ends of a mandrel 4, and fiber or cloth impregnated with a resin is wounds and laminated on the periphery thereof, and then a FRP pipe 1 having tapered portions at both ends is manufactured through a hot hardening process. The pipe 1 and joint elements 2 are integrated at the tapered portion 3. Accordingly, the strength reliability of the tapered portions can be improved without any machining on tapered portions.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for manufacturing a fiber-reinforced resin transmission shaft pipe (hereinafter referred to as FRP pipe) for vehicles and the like.

[Conventional technology]

Transmission shafts for vehicles are generally made of solid metal rods or hollow metal pipes with metal joint elements joined to both ends, but in recent years there has been a demand for lighter vehicles, so reinforcements are required. 2. Description of the Related Art Transmission shafts using fiber reinforced resin (hereinafter referred to as FRP), which is made of fibers such as glass fibers and carbon fibers and synthetic resins, are being actively developed. This is because the specific strength (strength/ratio 1i) and specific elasticity (elastic modulus/specific gravity) of FRP are superior to those of metals such as steel and aluminum, so in addition to being lightweight, it is also possible to achieve high-speed rotation while avoiding resonance. This is because it becomes possible. In the case of an FRP transmission shaft, it is generally necessary to provide a joint element at both ends of the FRP hollow pipe, so the FRP pipe and joint element are prepared separately and then joined by some method. . As such a method, for example, Japanese Patent Application Laid-Open No. 58-211011
No. 59-83620 and JP-A-59-83620, F
A re-tapered section is provided at both ends of the RP pipe by machining such as lathe processing, a matching taper section is provided on the coupling element, and the coupling element is bonded to the tapered section at both ends of the pipe with adhesive to form a transmission shaft. A method of manufacturing has been proposed.

[Problems to be solved by the invention]

However, forming a taper by machining these FRP pipes has the problem that the wall thickness is thin at the part where the stress concentration is greatest, and the fibers that should serve as reinforcement are cut, resulting in a considerable decrease in the strength of that part. Particularly in the case of cutting using a lathe, when an attempt is made to grip the outer surface of an FRP pipe with a plate, there is a drawback that centering takes a long time due to the poor precision of the outer surface. Furthermore, the addition of this taper processing step has the problem of increasing manufacturing costs.

[Means to try to solve the problem]

In view of these circumstances, the inventors of the present invention conducted extensive studies to solve problems such as a decrease in the strength of the tapered part due to machining and the complexity of forming the taper.
Furthermore, the present inventors have discovered that pipe formation and taper formation can be easily performed simultaneously without machining, and have completed the present invention. That is, the present invention provides a method for manufacturing a fiber-reinforced resin transmission shaft pipe, which is characterized by using a mandrel having tapered portions at both ends and forming a fiber-reinforced resin layer on the outer periphery of the mandrel. Hereinafter, the present invention will be explained in detail based on the drawings. Fig. 1 is a front sectional view of an example of a mandrel used to carry out the method of the present invention, in which a tapered auxiliary mandrel is fitted onto the outside, and Fig. 2 shows a tapered auxiliary mandrel obtained using the mandrel shown in Fig. 1. A front sectional view of a transmission shaft that integrates an FRP pipe and a joint element is shown. For example, as shown in FIG. 1, a mandrel 4 having tapered auxiliary mandrels 5 fitted onto both ends of the mandrel is used, and the periphery of the mandrel is made of fiber or fabric impregnated with resin. After wrapping and laminating the cloth and curing the resin by heating, the tapered auxiliary mandrel 5 and the mandrel 4 are pulled out in this order to produce an FRP pipe 1 having tapered portions at both ends. As shown in Fig. 2, the transmission shaft consists of an FRP vibrator 1 and a coupling element 2 with a tapered section 3.
It is manufactured by integrating with. Known means such as adhesion may be used as a method for integrating. FIG. 3 is a front view of a mandrel used in another embodiment of the present invention with tapers at both ends facing in the same direction;
The figure is a front sectional view of a power transmission shaft in which a tapered FRP pipe obtained using the mandrel shown in FIG. 3 and a joint element are integrated. FRP manufactured using the mandrel shown in Figure 3
The manufactured pipe is made by wrapping and laminating resin-impregnated fibers or woven cloth around the tapered mandrel 6 in the same way as above, and after curing the resin by heating, the tapered mandrel 6 is moved in the direction of arrow A.
It is obtained by pulling it out in the direction of. Similar to Fig. 2, the transmission shaft is manufactured by integrating the FRP pipe 1'' and the coupling elements 2, 2° at the tapered portions 3.3'', as shown in Fig. 4. Used in the present invention The resin and fiber or fabric are not particularly limited (e.g., epoxy resin,
Thermosetting resins such as unsaturated polyester resins, phenolic resins, and polyimide resins, thermoplastic resins such as polysulfone resins, polyamide resins, polyethersulfone resins, polyetheretherketone resins, polyetherketone resins, and polycarbonate resins are used. . In addition, fibers or woven fabrics include inorganic fibers such as carbon fiber, graphite fiber, glass fiber, silicon carbide fiber, alumina fiber, titania fiber, and boron nitride fiber, and organic fibers such as aromatic polyamide fiber, aromatic polyester fiber, and polybenzimidazole fiber. fibers are used. Furthermore, two or more types of resins and fibers can be combined as necessary. If a mandrel with tapered portions at both ends facing each other as shown in FIG. 1 is used, the obtained FRP pipe cannot be removed, so at least one end of the tapered portions at both ends of the mandrel is removable. Further, the method of attachment and detachment is not particularly limited. Since force is applied in the axial direction when the coupling element is integrated with the FRP pipe, the taper of the mandrel is preferably in the range of 115 to 1/200. The material of the man rule is not particularly limited, but iron, steel, aluminum, etc. are used because of ease of handling. The material of the tapered auxiliary mandrel is not particularly limited, and there is no problem even if the material is different from that of the mandrel.

【Example】

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited thereto. Example An auxiliary mandrel made of aluminum with a taper of 1/1O and a taper length of 85 m5 had a diameter of 80 m5+ as shown in FIG. Fibers impregnated with a resin serving as a matrix were sequentially wound by the filament winding method as described below, using fibers impregnated with a resin serving as a matrix. The resin used as the matrix is epoxy resin Sumi Epoxy 0 [! 100 parts by weight of L^128 (manufactured by Sumiki Chemical Industry ■), 85 parts by weight of epoxy resin curing agent HN3500 (manufactured by Hitachi Chemical Company ■), D of curing reaction accelerator Sumiki Air
(manufactured by Sumima Kagaku Kogyo ■) 1 part by weight of the mixture was used. Winding of 90 yen to the longitudinal direction of the mandrel is at an angle of E
After impregnating glass (manufactured by Nippon Sheet Glass) with the above resin mixture, it is wound to a thickness of approximately 0.25 mm, and the carbon fiber Magnite 0 is wound at an angle of 20° to the longitudinal direction of the mandrel. ^5-4 (manufactured by Sumika Harkieless ■)
The mandrel was impregnated with the same resin mixture and then wound to a thickness of about 1.5 seconds at an angle of 90° to the longitudinal direction of the mandrel.
E-glass (manufactured by Nippon Sheet Glass Co., Ltd.) impregnated with the same resin mixture was wrapped at an angle of about 0.4 ms to give a total thickness of 2.15 mm. After winding the resin-impregnated fibers around a mandrel, a release film was further wound around the mandrel and heated at 150°C for 2 hours to cure the resin and fix the fibers in the resin matrix. The auxiliary mandrel and then the mandrel were extracted from the cured FRP, and unnecessary portions were cut at both ends of the FRP to form a tapered FRP pipe. Next, the tapered part of the FRP pipe and the steel joint element were bonded together with an adhesive to obtain a transmission shaft. The transmission shaft was subjected to a torsion tester with the joint element supported, but
It was found that even a torque of 380 kg-m did not cause damage.

【Effect of the invention】

As described in detail above, the present invention allows the tapered part to be effectively integrated with the coupling element to be formed easily at the same time as pipe formation without machining, and furthermore, the tapered part has high reliability and reliability. It is possible to manufacture FRP pipes with a high level of resistance, and its industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a monolithic sectional view of a mandrel used to carry out the method of the present invention, in which a tapered auxiliary mandrel is fitted;
Fig. 2 is a front sectional view of a transmission shaft that integrates a tapered FRP pipe and a coupling element obtained using the mandrel shown in Fig. 1, and Fig. 3 is a front sectional view of a transmission shaft used in another embodiment of the present invention. Figure 4 is a front view of a mandrel with tapers at both ends facing in the same direction, and Figure 4 is a front view of a transmission shaft that integrates a tapered FRP pipe and a joint element obtained using the mandrel shown in Figure 3. FIG. 1.1゛ ... FRP pipe 2.2° ... Coupling element 3.3° ... Tapered part 4 ... Mandrel 5 ... Tapered auxiliary mandrel 6 ...
Tapered mandrel end 3 figure O 4 figure

Claims (1)

[Claims] 1) A method for manufacturing a fiber-reinforced resin transmission shaft pipe, characterized in that a mandrel having tapered portions at both ends is used, and a fiber-reinforced resin layer is formed on the outer periphery of the mandrel. The manufacturing method according to claim 1, wherein at least one end is removable.