JPH0587117A - Compound cylindrical member - Google Patents

Abstract

PURPOSE:To use the fiber material having a large degree of integration of a filament, and secure the desirable strength and the quality of the appearance. CONSTITUTION:A bracket 13 having multiple projections 16, which has a small cross section respectively, in the end surface thereof is connected to both ends of a thin and hollow mandrel 12. The whole surface of the mandrel 12 and the bracket 13 are coated with the fiber reinforced plastic main body 14, which is formed by the filament winding method for winding the fiber material impregnated with resin around of a part from the bracket 13 to the mandrel 12 through the projections 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite cylindrical member which is mainly made of fiber reinforced plastic (FRP) and has mounting fittings integrally at both ends thereof.

[0002]

2. Description of the Related Art Heretofore, a composite cylindrical member of this type generally has a structure in which mounting brackets are bonded to both ends of an independently manufactured FRP main body (cylindrical body) with an adhesive. However, in such a joint structure, the joint strength between the FRP main body and the mounting metal fitting depends exclusively on the strength of the adhesive, and when applied to a strength member to which a large force is applied, such as a power transmission shaft or a pressure vessel, the bonding strength is high. There is a risk of breaking from the part of the agent,
There was another problem of lack of reliability.

Therefore, for example, in Japanese Patent Application Laid-Open No. 61-172727, as shown in FIG. 4 incorporated from the publication, a pair of fittings 2 are fitted to a mandrel 1 with a predetermined space, A plurality of pins 3 are projectingly provided on the outer periphery of the mounting bracket 2, and the fiber material 5 impregnated with resin is guided along the mandrel 1 by using a guide jig (thread mouth) 4 by a filament winding method. A technique has been proposed in which the fibrous material 5 is hooked on the pin 3 of the mounting jig 2 and is laminated while being folded back. According to such a technique, the mounting metal fitting 2 is integrated into the FR at the same time when the resin impregnated in the fiber material 5 is cured by heating.
Since it is bonded to the P main body, the bonding strength between the two is increased, and its reliability is improved.

[0004]

However, according to the technique disclosed in the above publication, when the number of filaments constituting the fiber material 5 is increased in order to improve the productivity, the fiber through the pin 3 is used. There is a problem in that it is difficult to fold the material 5, and there is a certain limit to the degree of filament integration, so that productivity cannot be increased as expected. Further, since the folding back is a steep angle, the fibrous materials 5 are intensively overlapped at the folding back portion, local bulges and voids are easily generated on the outer peripheral surface, and there are many problems in terms of strength and appearance quality. That was where it was.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to enable the use of a fiber material having a high degree of filament integration and to obtain a desired strength. Another object of the present invention is to provide a composite cylindrical member capable of ensuring appearance quality.

[0006]

In order to achieve the above-mentioned object, the present invention comprises a hollow mandrel, a mounting member having a plurality of small cross-section projections connected to both ends of the hollow mandrel, and a resin. It is characterized in that it is composed of a fiber-reinforced plastic main body formed by winding the impregnated fibrous material through the protrusions and winding it around the hollow mandrel from the fitting.

In the present invention, as the above fiber material,
For example, glass fiber, carbon fiber, silicon carbide fiber, etc. can be selected, and as the resin impregnated therein, for example, epoxy resin, polyimide resin, unsaturated polyester resin, etc. can be selected. Furthermore, as a method of winding the fiber material impregnated with this resin around the mandrel,
Filament winding method using filamentous fiber material,
A tape winding method or the like using a prepreg can be adopted.

[0008]

In the composite cylindrical member constructed as described above, when the fiber-reinforced plastic main body is formed, the resin-impregnated fiber material is wound around between the protrusions on the end surface of the mounting metal fitting. The wrapping angle of is small, and it is possible to use a fiber material having a high degree of filament integration. Further, since the fibrous material is not concentrated on the outer peripheral surface of the mounting member, it is possible to prevent local swelling and void formation. Moreover, since the projection of the mounting bracket can be used as it is as a mounting portion for another member, there is no limitation on the range of use.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the structure of a composite cylindrical member according to the present invention and its usage. In the figure, 11 is a composite cylindrical member according to the present invention, which is a thin hollow mandrel 12
And the metal fittings 13 connected to both ends of the hollow mandrel 12
(One side omitted), hollow mandrel 12 and mounting bracket 13
Is mainly composed of a fiber-reinforced plastic main body (FRP main body) 14 that covers the entire surface of the. As shown in FIG. 3, a central shaft 15 having a small cross section is provided at the axial center of the end surface of the mounting bracket 13, and a plurality of small cross sections having the same small cross section are formed around the axial center. 16 protrusions (10 in this case)
Are provided, and the tip ends of the central shaft 15 and the protrusion 16 are exposed from the FRP main body 14. The composite cylindrical member 11 in the present embodiment is used as a power transmission shaft (propeller shaft) for automobiles, and the projection 16 of the mounting bracket 13 and the central shaft 15 as necessary are used for this purpose to make a universal joint. The yoke 17 constituting the
They are joined and integrated by a known method such as bolting. The yoke 17 is provided with a pair of holes 17a (one of which is omitted) facing each other, and a spider (not shown) is mounted in the holes 17a in practical use.

In order to manufacture such a composite cylindrical member 11, a hollow mandrel 12 and two mounting fittings 13 are prepared in advance, and as shown in FIG.
Sub-assembly 20 is manufactured by connecting 13 together. The mounting bracket 13 is
The hollow mandrel 12 has a stepped portion 13a with a reduced outer diameter on the side of the connecting portion, and by pressing the stepped portion 13a into the hollow mandrel 12, the outer periphery of the hollow mandrel 12 is connected flush with the hollow mandrel 12. Are joined together. During this connection, the hollow mandrel 12 is attached to the mounting bracket 13
May be fixed by adhesion or welding.

[0012] First, the central axis 15 of the mounting member 13 is connected to a filammet winding machine (hereinafter simply referred to as a machine).
The sub-assembly 20 is set in the machine by gripping the chuck part of the machine, and as shown in FIG. 3, the fiber material impregnated with the resin is rotated by using the guide jig 21 of the machine. Guide 22 along subassembly 20 and wind it all over. At this time, the rotation speed of the sub-assembly 20 and the guide jig
By controlling the moving speed of the fiber 21, the fibrous material 22 is guided through the protrusions 16 on the end face side of the mounting member 13 in a direction away from the shaft center by about 180 degrees, and the mounting member 13 The end surface of the fiber material 22 is folded back so as to be wound, and at the same time, the fiber material 22 is oriented at a predetermined inclination angle with respect to the axis of the subassembly 20. In this way, the fiber material 22 is wound and laminated on the subassembly 20, and the entire surface of the subassembly 20 is covered with the resin-impregnated fiber layer. Next, this is charged into a heating furnace to cure the resin impregnated in the fiber material 22. By this heat curing treatment, the resin-impregnated fiber layer is transformed into the FRP main body 14 (Fig. 1),
At this time, the fitting 12 is firmly adhered to the FRP main body 14, and the composite cylindrical member 11 is completed.

After that, as described above, the protrusion of the mounting bracket 13
16 and the yoke 17 are joined to the central shaft 15 as required to complete the power transmission shaft. When the central axis 15 is longer than the protrusion 16, this is cut before joining the yoke 17, but in some cases it may be used for centering the joining with the yoke 17. As described above, since the fiber material 22 impregnated with the resin is wound and laminated so that the end surface of the mounting member 13 is wound, the folding angle of the fiber material 22 becomes gentle, and the fiber material 22 having a large degree of filament integration is obtained. Can be used to improve productivity. Also,
Since the fibrous material 22 does not intensively overlap the outer peripheral surface of the mounting member 13, it is possible to prevent local swelling and voids from occurring and improve strength and appearance quality.
In this embodiment, in particular, the mounting bracket 13 is connected to the hollow mandrel 12 by utilizing the step 13a so that the outer peripheral surfaces of the both are flush with each other, so that a step may occur on the outer periphery of the FRP main body 14. Also, the overall appearance quality is improved.

The orientation angle of the fibrous material 22 has a great influence on the strength of the product (the power transmission shaft in this case), and the smaller the orientation angle (orientation in the axial direction), the greater the bending strength. It is known that a large torsional strength can be obtained in the range of 30 to 60 degrees (for example, refer to JP-A-2-236014). Therefore, in this embodiment, the orientation angle of the fiber material 22 is set so as to ensure appropriate bending strength and torsional strength, and if necessary, the composite cylindrical member 20 is formed by stacking fiber-reinforced plastic layers having different orientation angles in multiple layers. To get it.

According to the calculation, when the transmission torque required for the power transmission shaft is about 25 × τ kgf · cm (τ is the shear strength [kgf / cm ² ] of the attachment 13), the attachment 13 is Assuming that the positions of the projections 16 to be provided are set on a pitch circle having a radius of 3.2 cm and the number thereof is set to 10, if the projections having a diameter of 1 cm are provided, the projections that can withstand the transmission torque sufficiently. Becomes In this case, since the circumference of the pitch circle is about 20 cm, the interval between the protrusions 16 is 1 cm, and it can be seen that a sufficient margin can be secured for passing the fiber material 22.

[0016]

As described above in detail, according to the composite cylindrical member of the present invention, when the fiber-reinforced resin-plastic main body is formed, the resin-impregnated fiber material is folded back at a steep angle. Since it does not occur, it is possible to use a fibrous material having a high degree of filament integration, and it is possible to improve productivity. In addition, since local swelling and voids do not occur on the outer peripheral surface of the mounting member, it is possible to achieve stable improvement in strength and appearance quality. Further, the continuous fiber strengthens the bonding between the mounting member and the fiber-reinforced resin-plastic main body.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure and usage of a composite cylindrical member according to the present invention.

FIG. 2 is a cross-sectional view of a subassembly used in the manufacturing process of the present composite cylindrical member.

FIG. 3 is a perspective view showing an embodiment of winding a fiber material in the production of the present composite cylindrical member.

FIG. 4 is a perspective view showing an embodiment of winding a fiber material in manufacturing a conventional composite cylindrical member.

[Explanation of symbols]

 11 Composite cylindrical member 12 Hollow mandrel 13 Mounting bracket 14 Mainly fiber reinforced plastic 16 Projection 21 Guide jig 22 Fiber material impregnated with resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Asai 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor Masahiko Morinaga 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation

Claims (1)

[Claims] 1. A hollow mandrel, a mounting metal fitting having both ends of the hollow mandrel provided with a plurality of small projections having a small cross section on an end surface, and a fiber material impregnated with resin is passed through the projections from the mounting metal fitting. A composite cylindrical member comprising a fiber-reinforced plastic main body formed by winding the hollow mandrel.