JP2812161B2 - Composite hollow shaft and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite hollow shaft mainly made of fiber reinforced plastic (FRP) and having metal flanges integrally at both ends thereof, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, in order to manufacture such a composite hollow shaft, generally, a shaft main body and a metal flange are formed separately,
The method of fitting and integrating metal flanges with adhesive at both ends of the shaft main body was adopted, but since the bond strength is inevitably reduced due to the deterioration of the adhesive, such as drive shafts and pressure vessels When used as a strength member, problems remain in terms of durability reliability.

For example, Japanese Patent Application Laid-Open No. 4-34289 discloses a metal flange provided with a plurality of claws arranged in a circumferential direction on a cylindrical portion extending from a flange portion. Is fitted to a mandrel, and the resin impregnated fiber is wound around the mandrel by a filament winding method while being hooked on the claws of the metal flange to form a shaft main body, and then a hoop is provided between the flange portion and the claw portion. There has been proposed a manufacturing method in which a resin-impregnated fiber is wound in a shape, and then a curing treatment is performed to remove a mandrel. According to such a method, since the metal flange is integrated with the shaft main body made of FRP at the same time as the hardening treatment, the connection between the two is strengthened, and the durability reliability is improved.

[0004]

However, according to the method of manufacturing a composite hollow shaft described in the above publication, the metal flange has a shape having a claw in the vicinity of the flange portion. There has been a problem that the yarn end interferes with the flange portion of the metal flange, and it is difficult to form the shaft mainly. In particular, recently, a plurality of resin-impregnated fibers have been wound at a time by using a ring-shaped yarn as the clasp, but in this case, the entire ring-shaped clasp interferes with the flange portion, and Application has been impossible. To solve this problem,
It is sufficient to extend the cylindrical portion of the metal flange to separate the claw from the flange portion, but in this case, the weight of the metal flange increases, and the light weight advantage of the main body made of FRP is lost. This is not a fundamental measure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a composite hollow in which a metal flange can be securely integrated with a shaft without impairing manufacturability. An object of the present invention is to provide a method of manufacturing a shaft and a composite hollow shaft having a sufficient bonding strength.

[0006]

According to the present invention, in order to achieve the above object, the diameter of a base end of a cylindrical portion extending from a flange portion is gradually increased to form an enlarged diameter portion. A metal flange provided with a plurality of slits arranged in the same manner and a holding ring provided with a plurality of inclined pins arranged in the circumferential direction are prepared.First, the metal flange and the holding ring are separated from each other. Then, two sets are fitted to the mandrel, and the resin-impregnated fiber is wound around the mandrel while being hooked on the inclined pin of the holding ring to form a shaft main body. And the resin impregnated fiber is wound in a hoop shape around the inserted portion, followed by a hardening process to remove the mandrel.

[0007]

In the method of manufacturing a hollow shaft constructed as described above, since the metal flange is separated from the holding ring at first, the yarn opening for filament winding can be freely operated without interfering with the flange portion of the metal flange. Thus, the resin-impregnated fiber can be hooked on the inclined pin of the retaining ring to form the shaft main body. Also, after the shaft main body is formed, the metal flange is slid and the inclined pin of the holding ring is inserted into the slit, and the resin-impregnated fiber is hoop-wrapped therearound. Not only is it firmly joined in the axial direction, but it is also firmly joined in the circumferential direction by the engagement between the enlarged diameter portion of the metal flange and the inclined pin.

[0008]

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

FIG. 1 shows the final stage of the production of a composite hollow shaft according to the present invention. In the figure, 1 is a mandrel, 2 is a shaft main body formed by winding a resin-impregnated fiber described later around the mandrel 1, and 3 is a pair of metal flanges (one side is omitted) fitted to the mandrel 1, and a shaft main body. 2
And each metal flange 3 are connected via a holding ring 5 in which inclined pins 4 are arranged in the circumferential direction and a reinforcing layer 6 formed by winding resin impregnated fibers around the holding ring 5 in a hoop shape. Have been.

As shown in FIGS. 2 and 3, the metal flange 3 includes a flange portion 7 and a cylindrical portion 8, and a proximal end of the cylindrical portion 8 faces a coupling end with the shaft main body 2. The diameter is gradually increased. The enlarged diameter portion 9 of the cylindrical portion 8
Are provided with a plurality of slits 10 arranged in the circumferential direction and extending in the axial direction. In each slit 10, the inclined pin 4 provided on the holding ring 5 is fitted. Therefore, the slits 10 are provided in the same number as the inclined pins 4. Although the slit 10 has a parallel groove shape here, any shape can be used as long as the inclined pin 4 can be received, and for example, a slit 10 ′ having a tooth groove shape as shown in FIG. 3 may be used. In addition, the screw hole 1 used for connection with the mating member is formed in the flange portion 6 of the metal flange 3.
A plurality (four in this case) are provided at equal intervals in the circumferential direction.

After the final stage, the production of the hollow shaft is completed by performing a hardening treatment and extracting the mandrel 1, and the process up to this final stage is as shown in FIG. For convenience of explanation, the mandrel 1 is shown in FIG.
Is shown only at one end. When manufacturing hollow shafts,
First, a pair of metal flanges 3 and a pair of holding rings 5 are fitted to the mandrel 1 as shown in FIG. At this time, the pair of holding rings 5 are arranged opposite to each other so that the respective inclined pins 4 are directed toward the shaft end of the mandrel 1, and correspond to the length of the shaft main body 2 to be obtained. They are arranged at predetermined intervals and temporarily fixed to the mandrel 1 using, for example, set screws. On the other hand, each metal flange 3
Is positioned at a predetermined distance from the holding ring 5 temporarily fixed to the shaft end side of the mandrel 1 as described above.

Next, as shown in FIG.
Is rotated along the mandrel while rotating at a low speed as shown by arrow a.
2 is reciprocated as indicated by an arrow b, and the resin impregnated fiber W is wound around the mandrel 1 while being hooked on the inclined pins 4 of the pair of holding rings 5 to form the shaft main body 2. At this time, since the metal flange 3 is separated from the holding ring 5, the yarn opening 12 does not interfere with the metal flange 3, and the winding of the resin impregnated fiber W can be performed smoothly. The rotation speed of the mandrel 1 and the moving speed of the yarn opening 12 are
Adjustment is performed to obtain a desired orientation angle.

Next, as shown in the figure, the metal flange 3 is advanced as shown by the arrow c, and the inclined pin 4 of the holding ring 5 is inserted into the slit 10 provided in the enlarged diameter portion 8. Then, the surplus fibers around the inclined pin 4 are pushed into the enlarged diameter portion 8 and a part thereof enters a gap in the slit 10, and the surplus fiber layer 1 having a high fiber density is inserted into this portion.
3 are formed (see FIG. 1). Also, at this time, since excess resin is squeezed out, it is removed.

Next, as shown in FIG. 1, the resin impregnated fiber W is placed around the enlarged diameter portion 9 of the metal flange 3 and the holding ring 5.
Is wound in a hoop shape to form the reinforcing layer 6. Then, the fitting portion between the inclined pin 4 and the slit 10 is surrounded by the reinforcing layer 6 in a chevron shape. Therefore, if the mandrel 1 is removed by performing a hardening process thereafter, the metal flange 3 is removed.
Is firmly connected to the shaft main body 2 in the axial direction. Further, the enlarged diameter portion 9 of the metal flange 3 and the inclined pin 4 are engaged firmly in the circumferential direction by engagement. further,
As described above, since the excess resin is removed when the inclined pin 4 is fitted into the slit 10, no defects such as air bubbles are generated at the joint portion during the curing process, and stable quality is obtained. can get. The temporary fixing of the holding ring 5 to the mandrel 1 is released before the curing process.

[0015]

As described above in detail, according to the method for manufacturing a composite hollow shaft according to the present invention, the yarn for filament winding can be freely operated without interference with the metal flange, and the shaft can be mainly driven. Can be formed, so that the productivity is remarkably improved. In addition, since a small metal flange can be used, the advantage of light weight in which the shaft main body is made of FRP can be maximized. Further, the joint portion between the shaft main body and the metal flange has sufficient bonding strength obtained by engaging the hoop-wrapped reinforcing layer and the metal flange with the inclined pin, and can be used as a strength member. The application range of the shaft is greatly expanded.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a final stage of manufacturing a composite hollow shaft according to the present invention.

FIG. 2 is a sectional view showing a structure of a metal flange used in the present invention.

FIG. 3 is a front view taken along the line A in FIG. 2;

FIG. 4 is a front view showing a deformed structure of a metal flange.

FIG. 5 is a schematic view for sequentially illustrating a production process of the composite hollow shaft according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mandrel 2 Main axis 3 Metal flange 4 Inclined pin 5 Retaining ring 6 Reinforcement layer (hoop winding part) 7 Flange part 8 Cylindrical part 9 Large diameter part 10 Slit W Resin impregnated fiber

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tadao Ota 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-3-288013 (JP, A) JP-A-3-157511 (JP, A) JP-A-3-183532 (JP, A) JP-A-3-75314 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16C 3/02 B60K 17 / twenty two

Claims (2)

(57) [Claims] A metal flange formed by gradually increasing a diameter of a base end side of a cylindrical portion extending from the flange portion to form an enlarged diameter portion and a plurality of slits arranged in the circumferential direction in the enlarged diameter portion; Prepare a holding ring provided with a plurality of inclined pins arranged in the circumferential direction, firstly, two sets of the metal flange and the holding ring are separated from each other and fitted to a mandrel, and the resin-impregnated fiber is The mandrel is wound around the mandrel while being hooked on the holding pin to form a shaft main body. Then, the metal flange is slid and the slanting pin is inserted into the slit. Wrap the impregnated fiber in a hoop shape,
A method for producing a composite hollow shaft, comprising subjecting the mandrel to removal by performing a hardening treatment thereafter. 2. A composite hollow shaft manufactured by the method according to claim 1, wherein a metal flange is integrally formed at both ends of the shaft main body.