JPS6333452B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a hollow drive shaft made of fiber-reinforced composite material.

Fiber reinforced composite material (hereinafter abbreviated as FRCM)
Hollow drive shafts made from this material are light in weight and are being used effectively, for example, in automobile propeller shafts. In this case, as shown in Figures 1 and 2, the corresponding ends of the metal joint yoke 2 are fitted and glued into both ends of the FRCM hollow tube 1 as shown at 3 in Figure 2 to form the propeller shaft. Eggplant. By the way, the bonding strength of the joint yoke 2 to the hollow tube 1 is determined by the bonding area, that is, the axial length of the fitting portion 3 of both, and in order to make this bonding strength strong enough to withstand the transmitted torque, the fitting The actual situation is that the axial length of the portion 3 must be made considerably long. However, if the length of the fitting part 3 is increased, the metal joint yoke 2 itself becomes longer and larger, which increases the weight of the propeller shaft, and the effect of using the FRCM hollow tube 1 to reduce the weight is halved. .

Therefore, for the purpose of increasing the bonding strength described above without increasing the axial length of the fitting part 3, a third
It is conceivable to form a notch 4 in the end face of the FRCM hollow tube 1 as shown in FIGS. These notches 4 and protrusions 5 together with the adhesive surface of the fitting part 3,
A torque transmission function is achieved between the hollow tube 1 and the yoke 2, and there is no need to increase the adhesive strength at the fitting part 3, and the length of the yoke 2 can be shortened.

However, when forming the notch 4 on the end surface of the hollow tube 1, cutting the end surface of the hollow tube 1 into the shape of the notch 4 results in the fibers 6, which are the main components of the hollow tube 1.
is cut off at the notch 4 as shown in FIGS. 3 and 5, and does not reach the end surface of the hollow tube 1. That is, the fibers 6 are only scattered on the end face of the hollow tube 1. In this case, the strength of the end of the hollow tube 1 is inevitably insufficient, and a large torque is transmitted between the end of the hollow tube and the yoke 2 through the notch 4 and the protrusion 5. The end of the hollow tube 1 is easily destroyed.

From this point of view, the present invention provides a hollow drive shaft made of FRCM in which the protrusion of the joint yoke is inserted into the end face notch, so that the fibers of the hollow tube are not cut at the notch, and all of the fibers of the hollow tube are densely attached to the end face of the hollow tube. We have developed a manufacturing method that can cover up to 100%.

Hereinafter, the method of the present invention will be explained in detail based on the drawings.

In carrying out the method of the present invention, FIGS.
As shown in the figure, a mandrel 8 having a detachable pin 7 is used. The number and position of pins 7 are
Notch 4 to be formed on the end face of FRCM hollow tube 1
Each pin 7 projects radially from the mandrel 8 in its attached state, corresponding to the number and position of the pins 7 . Then, the mandrel 8 is rotated around the axis with the pin 7 attached, and during this time the mandrel 8
On the mandrel 8, the fiber 6, which has been passed through the liquid composite material and impregnated with this composite material, is wound while reciprocating in the axial direction of the mandrel 8. The width of this reciprocating motion is the sixth
As clearly shown in the figure, the width is greater than the distance between the axially spaced pins 7 of the mandrel 8. When the fibers 6 are wound on the mandrel 8 in this manner, the fibers 6 are wound avoiding each pin 7, and the wound fibers here become denser accordingly.

Thereafter, in this state, the curing of the composite material impregnated into the fibers 6 is accelerated by heating, and the hollow tube base material 9 is heated.
Model. After the hollow tube base material 9 is shaped by curing the composite material in this manner, all the pins 7 are pulled out from the mandrel 8, and this mandrel is pulled out from the hollow tube base material 9. In order to make it easier to remove the mandrel 8 from the hollow tube base material 9, it is necessary to
It is preferable to apply a release agent to the surface of the mandrel 8 before wrapping the fiber 6 thereon as described above.

The hollow tube base material 9 from which the mandrel 8 has been removed has a hole 1 having the same cross-sectional shape as the pin 7 at a location corresponding to the pin 7.
0, and by cutting the hollow tube base material 9 in the transverse direction within the plane 11 passing through the hole 10, the hollow tube 1 as shown in FIG. It can be manufactured to have.

A joint yoke 2 is attached to the end opening of the hollow tube 1 thus manufactured, and its protrusion 5 is shown in FIGS. 3 and 4.
A hollow drive shaft made of fiber-reinforced composite material can be obtained by fitting it into the notches 4 as shown in the figure.

According to the drive shaft manufactured by the method of the present invention described above, the fibers 6 of the hollow tube 1, which is the main component,
As shown in the figure, the hollow tube 1 is not cut at the notch 4, but extends closely along the end surface of the hollow tube 1, bypassing the notch 4, and has the notch 4 on the end surface. Even with the drive shaft using the hollow tube 1, the strength of the end face of the hollow tube 1 does not decrease, and the allowable transmission torque of the drive shaft can be maintained high.

[Brief explanation of the drawing]

Figure 1 is a side view of a propeller shaft using a hollow tube made of fiber-reinforced composite material, and Figure 2 is a side view of the propeller shaft shown in Figure 1.
A sectional view, FIG. 3 is a side view of the improved structure related to the joint yoke connection part of the propeller shaft shown in FIG. 1, FIG. 4 is a BB sectional view of FIG. 3, and FIG. A perspective view showing the end of the fiber-reinforced composite hollow tube used in the propeller shaft shown in FIG. 4;
FIG. 6 is a side view showing the state in the process of manufacturing a hollow tube made of fiber-reinforced composite material by the method of the present invention;
The figure is a sectional view taken along the line CC in FIG. 6, and FIG. 8 is a perspective view showing the end of a hollow tube made of a fiber-reinforced composite material manufactured by the method of the present invention. DESCRIPTION OF SYMBOLS 1...Hollow tube made of fiber reinforced composite material, 2...Joint yoke, 3...Joint yoke fitting adhesive part, 4...Notch, 5...Protrusion, 6...Fiber, 7
... Pin, 8 ... Mandrel, 9 ... Hollow tube base material made of fiber-reinforced composite material, 10 ... Hole, 11 ... Cut surface.

Claims (1)

[Claims] 1. A joint yoke is fitted into an opening at the end of a hollow tube made of fiber-reinforced composite material, and the axial protrusion of the joint yoke is inserted into a notch formed in the end surface of the hollow tube made of fiber-reinforced composite material. When manufacturing a hollow drive shaft made of a fiber-reinforced composite material, the fibers that have passed through the composite material are wound around the mandrel with pins that protrude in the radial direction inserted into the mandrel, and the fibers that have passed through the composite material are then hardened. Waiting for the formation of the hollow tube base material, the pin is pulled out from the mandrel, the mandrel is pulled out from the hollow tube base material, and then this hollow tube base material is inserted into the shaft passing through the hole formed by the pin. A hollow tube made of fiber-reinforced composite material is formed by cutting transversely within a right-angled plane to form a hollow tube made of fiber-reinforced composite material having the notch on the end surface, and the joint yoke is cut into a hollow tube made of fiber-reinforced composite material such that the protrusion enters the notch. A method for manufacturing a hollow drive shaft made of fiber-reinforced composite material, characterized in that it is fitted into an opening at the end of a pipe.