JPS58211011A - Transmission axle made of fiber reinforced composite material - Google Patents

Abstract

PURPOSE:To increase adhesive strength at adhesion portions by a method wherein the contact surface between a pipe made of fiber reinforced composite material and a coupling are in a tapered shape and then the contact surfaces are stuck together by adhesive agent. CONSTITUTION:Contact surfaces 5 between a pipe 1 made of fiber reinforced composite material and a coupling 2 are in a tapered form and then the contact surface 5 are stuck together by adhesive agent. In case of adhesion, an axial force is applied to achieve the adhesion. At this time, the air in the pipe 1 is discharged through air hole 3. When the contact surfaces 5 of the pipe 1 are machined to form a taper with a lathe, an arrangement of belt-like convex part 4 which can secure machining in a true circle in relation to the fluctuation stopper may eliminate necessity for direct machining of the outer surface of the pipe 1 in a true circle, so that the strength of the pipe 1 is not decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission shaft for transmitting rotating power of a motor, engine, etc. to a user, and particularly relates to a power transmission shaft having a pipe section made of fiber-reinforced composite material. .

Conventionally, power transmission shafts have generally been manufactured using solid metal rods or hollow metal pipes, but in recent years, studies have been conducted to develop power transmission shafts using fiber-reinforced composite materials such as glass fiber and carbon fiber. is being actively carried out. This is because the specific strength (strength/specific gravity) and specific elasticity (elastic modulus/specific gravity) of fiber-reinforced composite materials are superior to metals such as steel and aluminum, making it possible to achieve high-speed rotation while avoiding resonance. This is because it will become possible to reduce the weight of automobiles and the like, which is an aspirational goal.

Transmission shafts made of fiber-reinforced composite materials are generally shaped like hollow pipes, but they must be equipped with flange joints or flexible joints at both ends to receive power and transmit it to the next part. .

In the case of a metal transmission shaft, it is common to weld the fitting to the pipe, but with fiber-reinforced composite materials, it is relatively difficult to integrally mold the pipe and the fitting, so the pipe and fitting are separately welded. It is preferable to prepare it beforehand and then join it in some way later. The present invention provides a power transmission shaft to which one of such methods is applied.

That is, the transmission shaft according to the present invention is made of a pipe made of fiber-reinforced composite material, and as shown in FIGS. 1 and 2, the outer circumferential surface or inner circumferential surface of both ends thereof has a taper portion of 1/200 to 115. (5), the joint is also provided with a taper portion that matches this, and this is joined to both ends of the pipe with an adhesive. By applying a force in the axial direction during bonding by providing a taper of 1/2 oO to 115 mm, it becomes possible to bond firmly and to obtain a sufficient bonding length.

The joint may also be made of fiber-reinforced composite material (and may also be made of metal). The length of the bond is determined by the amount of torque to be transmitted.

Adhesives are often cured by applying heat, but in that case, if the fitting completely blocks the pipe, the trapped air in the pipe expands when heat is applied. Because the adhesive tries to escape through the adhesive surface, complete adhesion may not be achieved. In order to prevent this, it is preferable to provide a small number of air holes (3) in one joint as shown in FIG.

This air hole (3) should be so small that it does not substantially affect the strength of the transmission shaft.

When tapering the adhesive surface of the pipe mentioned above, lathe processing is generally performed, but for example, when the diameter is 80 m or more, it is necessary to insert the pipe into the center of the chuck of the lathe and bring the machined part near the chuck. become unable. Therefore, it is necessary to hold the side that will not be processed with a chuck and hold the side that is to be processed with a grip. However, since the outer periphery of fiber-reinforced composite material pipes is usually not perfectly circular, the area where the rims meet must be shaved to create a perfect circle. If you cut the pipe as it is, you will inevitably lose strength, so prepare a belt-shaped convex part (4) in advance in the area where the rim is expected to hit, and cut it to create a perfect circle. It is effective to issue

Preferably, its location is close to the end to be tapered. Of course, it goes without saying that such a method is unnecessary for relatively thin nokubu.

The present inventor manufactured a propeller shaft for a passenger car in accordance with the above-described invention, and was able to obtain extremely good results.

Note that it is within the scope of the present invention to use bolting or riveting in a direction perpendicular to the circumferential surface of the adhesive surface in order to increase the bonding strength of the adhesive part.

Various reinforcing fibers can be used for the fiber-reinforced composite material, such as silicon carbide fibers, alumina fibers, and carbon fibers.

Examples include graphitized fibers, glass fibers, aramid fibers, boron fibers, etc., and these can be used alone or in appropriate combinations.

Further, as the matrix resin, thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol resins, and polyimide resins, and thermoplastic resins such as polyamides and polycarbonates can be used.

The power transmission shaft according to the present invention was subjected to a test machine, and it was found that the bonded portion had sufficient strength.

[Brief explanation of drawings]

Both FIG. 1 and FIG. 2 show an example according to the present invention, and partially show a cross section. 1. Fiber-reinforced composite material pipe 2, joint 3, air hole 4゛ band-shaped portion 5, part of the taper (adhesive portion) Patent applicant Mitsubishi Rayon Co., Ltd., representative patent attorney 1) Satoshi Muratake

Claims (1)

[Claims] (1) In a transmission shaft having a fiber-reinforced composite material pipe, the outer circumferential surface or inner circumferential surface of both ends of the transmission shaft has a diameter of /200 to
A power transmission shaft characterized in that a part of the taper of 115 is provided, the joint is also provided with a part of the taper that matches this, and this is joined to both ends of the pipe with an adhesive.