JPH01154730A - Manufacture of power transmission shaft - Google Patents

Abstract

PURPOSE:To make it possible to easily and surely reinforce an plastic joint part without being effected by the dispersion of the dimension of the outer diameter of an outside power transmission member in elastic joining by a method wherein filament winding is applied over respective outer peripheral parts of both the power transmission members at their plastic joining part after the inside and outside power transmission members are elastically jointed to each other through serration. CONSTITUTION:When both the end parts 11a of a pipe member 11, into each of which the shaft part 10a of a yoke 10 is fitted, are radially squeezed for caulking, the inner peripheral part of each of end parts 11a is elastically worked so as to fit to the serration of the yoke 10. After that, fiber 18, which is impregnated with resin by being passed through a tank 17 filled with the molten resin, is thickly wound over round the outer peripheral part of the pipe member 11 at the plastic joining part and the outer peripheral part of the yoke 10 adjacent to said pipe member 11 by rotating the pipe member 11 (or is filament-wound), and finally the resin is cured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a power transmission shaft formed by coupling at least two power transmission members.

(Prior art and its problems) Conventionally, in a propeller shaft for an automobile, as shown in FIG. 6, a male spline portion 3a of a metal pipe member 3 is fitted into a female spline portion 1a of a metal yoke l and connected. (see Utility Model Application Publication No. 59-98127),
Alternatively, as shown in FIG. 7, the inner peripheral part of the pipe member 3 is fitted onto the serration part 1b formed on the outer peripheral part of the metal yoke l, and the pipe member 3 is swaged (pipe drawing process). Further, as shown in FIG. 8, after fitting the end 5a of the fiber-reinforced plastic pipe member 5 onto the shaft 4a of the metal yoke 4, Although a method has been proposed in which the ring 6 is tightened (see Japanese Utility Model Application Publication No. 61-162619), there is a problem in that the joint portion shifts due to insufficient strength of the spline portion, serration portion, and tightening portion during high loads.

Therefore, as shown in Fig. 7, after the yoke and the pipe member are connected through serrations, it is possible to strengthen the outer periphery of the joint by tightening the ring with a ring as shown in Fig. 8. Since the outer diameter D of the outer periphery of the joint (see Figure 7) varies depending on the product (for example, about ±0.5 mm for D = φ90), operations such as press fitting and shrink fitting of the ring are extremely difficult. Have difficulty.

On the other hand, as shown in FIGS. 9(a) and 9(b), it has been proposed that the yoke 7, the pipe member 8, and the ring 9 are simultaneously caulked and connected using an electromagnetic caulking device M. There is a limit to the caulking ability of M, and it is not possible to use a material with a high specific modulus of elasticity for the ring 9, even though it is preferable to use a material with a high specific modulus in order to reduce the weight and increase the bonding strength. However, there is a problem in that the ring 9 cannot be made of a thick material or a material that is difficult to conduct electricity.

(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and aims to easily and reliably reinforce the plastic joint between the inner power transmission member (yoke) and the outer power transmission member (pipe member). This is the basic purpose.

(Structure of the Invention) For this reason, the present invention provides that after the inner peripheral part of the outer power transmitting member is fitted onto the serrations formed on the outer peripheral part of the inner power transmitting member and the outer power transmitting member is plastically connected, the inner peripheral part of the outer power transmitting member is The present invention is characterized in that filament winding is applied across the outer circumferential portion of the power transmitting member and the outer circumferential portion of the inner power transmitting member adjacent thereto.

(Operations and Effects of the Invention) The present invention provides a method for plastically coupling an inner power transmitting member and an outer power transmitting member at a serration portion, and then performing filament winding across each outer peripheral portion of both power transmitting members at the plastic joint portion. This is what I did.

Therefore, the reinforcing member (filament winding layer) can be easily provided on the outer periphery of the outer power transmission member without being affected by variations in the outer diameter dimension of the outer power transmission member when plastically coupled.

In addition, by using filament winding across both power transmission members, the bonding force between both members is improved, resulting in a structure that is resistant to high load torsional torque, etc., and the sealing between both members is also effectively performed. .

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The yoke (inner power transmission member) 10 and pipe member (outer power transmission member) 11 of the propeller shaft for an automobile shown in FIGS. 1 to 3 are made of aluminum alloy.

The material of the yoke 10 and pipe member 11 is 6061
After manufacturing the yoke 10 by forging and the pipe member 11 by extrusion, the yoke lO is subjected to T6 treatment, and the pipe member 1
1 performs T4 processing, which is a softer processing.

Serrations 10b in the axial direction are formed at a predetermined pitch over the entire circumference of the outer circumferential portion of the shaft portion 10a of the yoke 10.

Then, as shown in FIG. 4, the intermediate portion of the pipe member 11 is supported on jigs 14, 14 attached to the base board 13, and the shaft of the yoke 10, 10 is attached to both ends lla, lla of the pipe member 11. Insert the parts 10a and 10a, respectively,
Move the movable caulking die 15 in the direction of the arrow to tighten the end portion 11.
When narrowing a in the direction of diameter reduction and caulking, the end 11
The inner peripheral part of a is the serration part of the yoke lO (Fig.
b), and the pipe member 11 is plastically bonded to the yoke lO (see the third
(see figure). Note that 16 is a yoke holding member that prevents the yoke 10 from moving in the axial direction.

Thereafter, as shown in FIG. 5, the tank 1 containing the molten resin is
The fibers 18 impregnated with resin by passing through the fibers 18 are spread over the outer circumference of the pipe member 11 at the plastic joint portion and the outer circumference of the yoke 10 adjacent thereto, and are tightly packed while rotating the pipe member 11. After winding (filament winding), the resin is cured.

As the impregnating resin, polyester resins, epoxy resins, and vinyl ester resins are most suitable because they impregnate the fibers 18 quickly, shrink less during curing and do not generate cracks, and cure quickly.

Further, as the fibers 18, glass fibers, carbon fibers, and ceramic fibers, which have a high elastic modulus and a low coefficient of thermal expansion relative to the material of the pipe member 11, are optimal.

The maximum temperature when using the propeller shaft is about 150°C, whereas the heat distortion temperature and normal service limit temperature of FRP, which is a mixture of fiber 18 and resin, are 180°C, respectively.
°C to 200 °C, 100 °C to 200 °C, and there are no problems.

Therefore, with the above method, variations in the outer diameter dimension of the pipe member 11 when plastically bonded can be ignored, and it is possible to easily provide a reinforcing member (filament winding layer) on the outer periphery of the pipe member 11. Become.

In addition, since the filament winding layer is formed across the yoke 10 and the pipe member 11, the yoke lO
The bonding force between the pipe member 11 and the pipe member 11 is improved, even when a high load torsional torque is applied to the pipe member! There is no risk that the end portion 11a of (2) will expand in diameter, and furthermore, moisture and salt can be effectively prevented from entering between the yoke 10 and the pipe member 11, and the yoke IO and the pipe member 11 can be effectively prevented from coming off. Ru.

Furthermore, by using the fiber M118 with high elasticity, the effect of preventing tube expansion is greater than when tightening with aluminum alloy rings of the same weight.

Furthermore, since the coefficient of thermal expansion of the fiber NH8 is smaller than that of the pipe member 11 (aluminum alloy), the tightening force increases when the propeller shaft reaches a high temperature (up to 150° C.) during operation.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a propeller shaft according to the present invention;
Figure 2 is a sectional view taken along the line I-I in Figure 1, and Figure 3 is a cross-sectional view taken along line A in Figure 2.
4 is a side view of the plastic coupling device for the yoke and the pipe member, FIG. 5 is a side view of the filament winding device, FIGS. 6, 7, 8, 9 (a) and FIG. 9(b) is a side sectional view of a conventional propeller shaft. 10...Yoke (inner power transmission member), 10a...
Shaft part, tab...serration part, 11...bifu'm material (outer power transmission member), lla...end part, 18
···fiber.

Claims (1)

[Claims] (1) After the inner peripheral part of the outer power transmitting member is fitted onto the serrations formed on the outer peripheral part of the inner power transmitting member and the outer peripheral part of the outer power transmitting member is plastically connected, the outer peripheral part of the outer power transmitting member of the plastic joint part is A method for manufacturing a power transmission shaft, characterized in that filament winding is applied to the outer peripheral part of an inner power transmission member adjacent to the shaft.