JPH04140512A - Manufacture of power transmission shaft - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for manufacturing a power transmission shaft, and more specifically, to a method for manufacturing a power transmission shaft, and more specifically to a method for manufacturing a power transmission shaft, and more specifically, a method for manufacturing a power transmission shaft, and more specifically, a method for manufacturing a power transmission shaft. The present invention relates to a method of manufacturing a transmission shaft.

(Prior art) In recent years, due to the demand for lighter power transmission shafts used in vehicles, etc., continuous fiber reinforced plastics (hereinafter referred to as F
The development of a power transmission shaft using a molded body made of FRP (RP) is progressing, but in this case, it is necessary to connect a metal yoke to both ends of the FRP pipe, and various methods have been used for this connection. Efforts have been made. For example, the joint part of an FRP pipe and a yoke may have a circular cross section, an elliptical cross section, or a polygonal cross section that can fit together,
There is a method of adhesively bonding the RP vibrator after it has been molded and cured, a method of press-fitting the same, and a method of incorporating the yoke itself or a part of it into a mandrel and winding it up during filament winding to form the FRP vibrator. Yes, each has its advantages and disadvantages.

The present invention improves the method of bonding the PRP pipe and the yoke by bonding the joints of the above methods.

By the way, in the case of a power transmission shaft obtained by joining a metal yoke to an FRP vibrator, the joint between the FRP pipe and the yoke does not suffer from fatigue damage due to repeated application of driving force or braking force. However, there is a problem in that it is easy to cause delamination between the FRP layers and peeling of the adhesive layer.

In order to deal with this problem, it is necessary to firmly bond the joint between the pipe and the yoke.
As disclosed in Publication No. 0919, after inserting the pipe end into the groove formed in the yoke, adhesive is injected into the joint between the two through the injection hole formed on the outer periphery of the yoke. Methods for obtaining a power transmission shaft have been proposed.

(Problem to be solved by the invention) On the other hand, the ideal thickness of the adhesive layer when performing adhesive bonding is 5.
It is said to be about 0 to 100 μm, and this is the joint # of the power transmission shaft of the known example (i.e., the joint between the pipe and the yoke).
If you try to apply it to the gap, even if you improve the machining accuracy and obtain an appropriate gap, it will be difficult to fill the gap with adhesive sufficiently, making it difficult to obtain a strong bond. be.

Therefore, the yoke is inserted into the end of the FRP vibrator, a relatively large gap (for example, several hundred μm) is formed at the joint between the two, and adhesive is injected into the gap from the injection hole formed in the FRP pipe. Therefore, a method can be considered to ensure that the adhesive is sufficiently filled into the joint, but in this case, the problem is that the FRP pipe is a difficult-to-cut material and the reinforcing fibers are cut. The following problems may occur. In other words, the cutting edge of the drill for cutting is severely worn and productivity is poor, the cutting surface is easily rough and difficult to deburr, causing adhesive leakage, and stress concentration at the injection hole causes fatigue. Problems such as a reduction in service life may occur. Incidentally, as disclosed in Japanese Utility Model Application Publication No. 55-90433, an FRP vibrator in which the area around the hole formed in the vibrator is reinforced with a fiber reinforcing material has also been proposed, but this known example Technology cannot adequately deal with the above-mentioned problems.

The present invention was made in view of the above points, and
To make it possible to form an injection hole for injecting adhesive into a joint between a manufactured pipe and a yoke during the molding of an FRP vibrator, thereby improving productivity of a power transmission shaft. The purpose is to

(Means for solving the problem) In the present invention, as a means for solving the above problem,
When manufacturing a power transmission shaft by joining a yoke to a pipe made of fiber-reinforced plastic, a filament winding method is applied to a mandrel in which a through hole is formed at a portion corresponding to the joint of the pipe with the yoke. A filament winding layer is formed by winding a resin-impregnated filament, and before the filament winding layer is cured, a pin member having an edge shape at the tip and having a passage inside and made of a brittle material is passed through the filament winding layer. The filament winding layer is hardened in this state, and then the tip of the pin member is cut at the inner circumference of the pipe by the shearing force generated when removing the pipe from the mandrel. After that, the fitting part of the yoke is inserted into the end of the pipe, and adhesive is injected into the joint between the two via the passage part of the pin member.

(Function) In the present invention, the following effects can be obtained by the above means.

That is, the injection hole formed to inject the adhesive into the joint between the FRP pipe and the yoke is inserted during the molding of the FRP pipe (i.e., before the filament winding layer has hardened).
The adhesive is injected through the passage of the pin member which is inserted into the filament winding layer.

(Effects of the Invention) According to the present invention, when manufacturing a power transmission shaft by joining a yoke to a pipe made of fiber-reinforced plastic, a through hole is formed in a portion of the pipe corresponding to the joint with the yoke. A filament winding layer is formed by winding a resin-impregnated filament around the formed mandrel using a filament winding method, and before the filament winding layer hardens, a passage portion is plastered inside with an edge shape and a brittle material is formed. A pin member made of the above is inserted into the through hole through the filament winding layer, the filament winding layer is hardened in this state, and then the tip of the pin member is pushed into the pipe by the shearing force when removing the pipe from the mandrel. A fiber-reinforced plastic pipe is manufactured by cutting at the circumferential position, and then the fitting part of the yoke is inserted into the end of the pipe, and adhesive is applied to the joint between the two through the passage part of the pin member. Since the adhesive is injected into the joint between the FRP pipe and the yoke, the injection hole that is formed to inject the adhesive into the joint between the FRP pipe and the yoke is inserted during the molding of the FRP pipe (i.e., before the filament winding layer hardens). This is formed by the passage of the pin member inserted into the filament winding layer, and has the excellent effect that the adhesive injection passage can be secured by extremely simple means without cutting the reinforcing fibers.

Further, since the adhesive can be injected through the passage portion of the pin member, there is also an effect that leakage prevention and sealing performance can be easily ensured when the adhesive is injected.

(Examples) Hereinafter, a method for manufacturing a power transmission shaft according to the present invention will be described based on specific examples with reference to the accompanying drawings.

In the case of this embodiment, as shown in Figure 2, the power transmission shaft A is
It is composed of a pipe l made of PRP and a metal yoke 2 connected to both ends of the pipe l. Although only one end is shown in the drawing, the other end also has the same structure.

The pipe 1 is manufactured by a filament winding method.

That is, as shown in FIG. 3, while rotating a mandrel 11 having a large number of pins radially protruding from the outer periphery of both ends at a predetermined angular velocity, resin is applied to the pins 12, 12, and so on. By passing the impregnated filament 13 over the mandrel 11, an FRP pipe 1 made of a filament winding layer is formed around the outer periphery of the mandrel 11. [Symbol] 4 is a resin impregnation tank for impregnating the filament 13 with resin, 15
is a delivery eye that reciprocates to pass the resin-impregnated filament 13 onto the pins 12, 12, .

In this embodiment, the mandrel 11 is formed with through holes 16, 16 facing each other at a portion corresponding to the joint portion of the pipe 1 with the yoke 2, as shown in the first figure.

Next, a method for manufacturing the power transmission shaft according to this embodiment will be explained.

First, a filament winding layer 1' is formed by winding the resin-impregnated filament 13 around the mandrel 11 having the above-described structure by the filament winding method described above (see FIG. 1). Then, before the filament winding layer 1' is hardened, a pin member 3 having an edge shape at the tip and having a passage portion 4 inside and made of a brittle material is inserted into the through hole 16 through the filament winding layer. By curing the filament winding layer 1', an FRP pipe 1 is formed. The material of this pin member 3 is preferably one with low plastic deformability, such as resin or light alloy.

In this embodiment, a flange portion 5 is formed on the outer periphery of the pin member 3, and the flange portion 5 suppresses the swelling of the surrounding area that occurs when the pin member 3 penetrates the filament winding layer 1'. It has a function to ensure a predetermined insertion depth, and a function to prevent the pin wJ set 3 from falling.

Next, when the tip (2) of the pin member 3 is cut at the inner peripheral position of the vibrator by the shearing force when demolding the vibrator 1 from the mandrel 11, the inside and outside of the vibrator 1 are brought into communication through the passage portion 4 of the pin member 39. (See Figure 2)
. Thereafter, the end surface of the vibrator 1 is finished, and the fitting part 2a of the yoke 2 is inserted into the end of the vibrator 1, and one (i.e.,
The adhesive P is injected into the joint S of the two through the passage part 4 of the pin member 3 (located above), so that the entire joint S is filled with the adhesive P. At this time, the other (i.e., located below)
The passage portion 4 of the pin member 3 functions as an air vent.

Thereafter, after the adhesive P has hardened, the protruding portion of the pin member 3 is cut off.

As mentioned above, in this example, the FRP pipe l
An injection passage formed to inject the adhesive P into the joint S between the yoke 2 and the
This is formed by the passage section 4 of the pin member 3 inserted into the filament winding layer (before the filament winding layer is cured), and the adhesive injection passage can be formed by extremely simple means without cutting the reinforcing fibers. can be ensured.

Further, since the adhesive can be injected through the passage portion 4 of the pin member 3, leakage prevention and sealing performance can be easily ensured when the adhesive is injected.

[Brief explanation of the drawing]

Figure 1 is an intermediate process diagram in the method for manufacturing a power transmission shaft of the present invention, Figure 2 is a sectional view showing the state during adhesive injection in the manufacturing method of the present invention, and Figure 3 is for manufacturing an FRP pipe. 1 is a perspective view showing an outline of a filament winding device of FIG. ■...Vibe 1'...Filament winding layer 2...
... Yoke 3 ... Pin member 4 ... Passage portion 1, 1 ... Mandrel 13 ... Filament] 6 ... Through hole P ... Adhesive S ...Joint part Fig. 1'M2 Fig. 2, φ middle... Yoke 3... Pino member 4... Passage section +1... M/Trel +3, φ... Filament +6...Through hole P...Touching S...Joint part

Claims (1)

[Claims] 1. When manufacturing a power transmission shaft by connecting a yoke to a fiber-reinforced plastic pipe,
A filament winding layer is formed by winding a resin-impregnated filament by a filament winding method around a mandrel in which a through hole is formed at a portion corresponding to the joint with the yoke of the pipe, and before the filament winding layer is cured. Then, a pin member having a tip edge shape and having a passage inside and made of a brittle material is inserted into the through hole through the filament winding layer, the filament winding layer is hardened in this state, and then the pipe is removed from the mandrel. A fiber-reinforced plastic pipe is produced by cutting the tip of the pin member at the inner periphery of the pipe using shearing force during molding, and then inserting the fitting part of the yoke into the end of the pipe. A method of manufacturing a power transmission shaft, comprising injecting an adhesive into a joint between the pin member through a passage portion of the pin member.