JPH05306709A - Power transmitting shaft made of fiber reinforced resin and its manufacture - Google Patents

Abstract

PURPOSE:To suppress generation of cracks in a radial reinforced layer at a jointed portion of a power transmitting shaft made of fiber reinforced resin which is to be connected to a coupling element, and to cover up the cracks for preventing infiltration of water and oil even if cracks are generated. CONSTITUTION:In a jointed portion of a power transmitting shaft made of fiber reinforced resin which is to be connected to a coupling element, a torque transmitting layer 5, a radial reinforced layer 6 and a skin layer 7 are provided on the shaft (1) from the inside toward the outside. This torque transmitting layer 5 is a fiber reinforced resin layer having an orientation angle of fibers of 0-+ or -60 deg., and the radial reinforced layer 6 is a fiber reinforced resin layer in which fibers are wound with a helical angle of + or -75-+ or -90 deg.C, and the skin layer 7 is a fiber reinforced resin layer which has an orientation angle of fibers smaller at least by 20 deg. in absolute value than the helical angle of the fiber in the radial reinforced layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fiber reinforced resin (hereinafter referred to as F
RP) and a manufacturing method thereof. In particular, the present invention relates to a fiber-reinforced resin driving force transmitting shaft suitable for automobiles and ships, and a method for manufacturing the shaft.

[0002]

2. Description of the Related Art Generally, a shaft for transmitting a driving force of a vehicle, a ship or the like has been formed by joining a metal joint element to both ends of a solid metal rod or a hollow metal pipe. However, in recent years, attention has been paid to the weight reduction of automobiles, and not only is the metal portion of the vehicle body made of FRP, but the structural members are made of FR
Making P is also attracting attention. Since the shaft that transmits the driving force in the structural member is a rotating portion, its weight saving effect is great. Therefore, the driving force transmission shaft F
The RP conversion has received particular attention.

A conventional steel driving force transmission shaft is
By changing to RP, the shaft weight is 1/4 to 1
/ 2, so FRP drive force transmission shafts have come to be installed in various automobiles.

Further, in the pursuit of comfortable riding comfort in ships as well, in order to remove the resonance frequency from the practical range, the use of FRP for the driving force transmission shaft has been attracting attention. That is, the specific strength (strength / density) and specific rigidity (elastic modulus / density) of FRP are superior to the specific strength and specific rigidity of metals such as steel and aluminum, and the orientation angle of fibers is changed. Since the bending rigidity and the torsional rigidity can be freely changed by, it is possible to increase the resonance frequency or, conversely, decrease it while maintaining the torsional strength.

In the case of an FRP driving force transmission shaft, generally, a joint element must be provided at both ends of a hollow pipe of the FRP, and therefore, the FRP pipe and the joint element are separately prepared, and some method will be used later. It has been manufactured by joining with. As such a method, for example, in Japanese Patent Laid-Open No. 64-49719, the winding angle of the fibers of the torque transmission layer of the FRP driving force transmission shaft is ± 4.
When the angle is shallow with respect to the axis of the shaft, such as 5 ° to ± 10 ° (double sign same order, helical winding), the rigidity of the joint portion in the radial direction and the circumferential direction of the shaft is insufficient,
It has been proposed to wind and reinforce the fibers from above the helical turns, preferably at an wrap angle greater than 75 ° absolute.

[0006]

However, when the reinforcing fiber is wound from the top of the helical winding at a large winding angle, the thermal expansion coefficient of the torque transmission layer of the shaft and that of the radial direction reinforcing layer are greatly different from each other. There is a problem that cracks are likely to occur in the radial direction of the reinforcing layer due to temperature changes in the environment when it is mounted on a car or a vehicle and driven. Therefore, although there is no problem in mechanical properties, cracks can be seen from the outside, so that there is a problem that the commercial value is lost. A method of coating the surface to conceal the cracks can be considered, but it is not sufficient and there is a problem that the cost increases. Further, it is conceivable that water or oil may infiltrate from the generated cracks, resulting in deterioration of the resin and rust of the joint element in the long term. An object of the present invention is to suppress the occurrence of cracks in the radial reinforcing layer in the joint portion of the shaft, to conceal the cracks even if they occur, and to prevent water or oil from entering through the cracks. The present invention provides a shaft for driving force transmission made of fiber-reinforced resin and a method for manufacturing the same.

[0007]

The inventors of the present invention have reached the present invention as a result of extensive studies to solve these problems. That is, the present invention is a fiber-reinforced resin drive force transmitting shaft to be joined with a joint element,
The joint portion of the shaft is composed of (1) a plurality of laminated layers / surface layers of a torque transmission layer / a radial direction reinforcement layer / a surface layer, or a (torque transmission layer / a radial direction reinforcement layer) from the inside to the outside of the shaft, (2) ) In the torque transmission layer, the orientation angle of the fiber with respect to the shaft axis is 0 to + 60 °, 0 to -60 ° or 0 ±.
It is a fiber-reinforced resin layer of 60 °, and (3) the radial direction reinforcing layer has an orientation angle of the fiber with respect to the shaft axis of +75 to +9.
A fiber reinforced resin layer of 0 °, −75 to −90 ° or ± 75 to ± 90 ° (same order of compound numbers), and (4) the surface layer has a fiber orientation angle with respect to the shaft axis of the radial direction reinforcing layer. A fiber-reinforced resin layer made of a fiber-reinforced resin woven fabric impregnated with a resin or a fiber-reinforced resin layer impregnated with a resin having an absolute value smaller by 20 ° than the orientation angle of the fiber-reinforced resin. Is.

Further, according to the present invention, a driving force transmission made of a fiber reinforced resin is characterized in that the outer layer portion of the surface layer is provided with a layer of a chemical fiber woven fabric and / or a natural fiber woven fabric impregnated with a resin. It relates to a shaft for use.

The present invention also provides a method for manufacturing a driving force transmitting shaft made of fiber reinforced resin, which is joined to a joint element,
(1) The joint portion of the shaft is a laminated structure of a torque transmission layer / a radial reinforcement layer / a surface layer or a plurality of (torque transmission layer / a radial reinforcement layer) / a laminated structure of a surface layer from the inner side to the outer side of the shaft. (2) As the torque transmission layer, the winding angle is 0 to ± while impregnating the liquid thermosetting resin by the filament winding method.
Wrap the fiber around the mandrel with a helical winding at 60 °,
Alternatively, fibers impregnated with a liquid thermosetting resin are formed on the mandrel by a drawing method in the axial direction of the shaft, or the angle of the fibers with respect to the axial direction of the shaft is 0 to 0.
+ 60 ° or 0-60 ° prepreg or 0
A prepreg of + 60 ° and 0 to -60 ° alternately laminated is wound around a mandrel, and (3) as a radial reinforcing layer, a winding angle is ± 75 to ± 90 while impregnating a liquid thermosetting resin by a filament winding method. The fiber is helically wound at a temperature of 90 degrees (the same number as the double number), or a prepreg or an angle of the fiber with respect to the axial direction of the shaft is +75 to + 90 ° or −75 to −90 ° or +75 to +90.
The prepregs, which are alternately laminated at an angle of −75 to −90 °, are wound, and (4) as a surface layer, while being impregnated with a liquid thermosetting resin by a filament winding method, an absolute value is obtained from the orientation angle of the fibers of the radial direction reinforcing layer. At a winding angle of at least 20 ° smaller than the helical winding of the fiber, or a unidirectional prepreg or an alternating prepreg having an orientation angle smaller than the orientation angle of the fiber of the radial reinforcing layer by at least 20 ° in absolute value, or in a liquid state. The present invention relates to a method for manufacturing a drive force transmitting shaft made of fiber reinforced resin, which is characterized in that a woven fabric made of reinforcing fibers is wound while impregnated with the thermosetting resin of (1), and the resin is thermally cured.

Further, according to the present invention, at least one kind of woven fabric selected from the group consisting of synthetic fiber woven fabric, semi-synthetic fiber woven fabric and natural fiber woven fabric, wherein the outer layer portion of the surface layer is impregnated with resin. The present invention relates to a method for producing a driving force transmitting shaft made of fiber reinforced resin, which comprises winding one or more layers, allowing the resin to ooze onto the woven fabric, and thermosetting the resin.

The joint portion of the fiber-reinforced resin driving force transmitting shaft of the present invention is formed from the inside to the outside of the shaft.
It is preferably composed of a torque transmission layer, a radial reinforcing layer, and a surface layer. Regarding the portions of the torque transmission layer and the radial reinforcing layer, a plurality of (torque transmission layer / radial reinforcing layer) may be laminated. Further, when the torque transmission layer and the radial direction reinforcement layer are formed by the filament winding method, the fibers of the torque transmission layer and the radial direction reinforcement layer are simultaneously wound to form the torque transmission layer and the radial direction reinforcement layer. The reinforcing layer may be substantially integrated. Further, in the shaft of the present invention, the joint may be at one end or both ends of the shaft, but it is preferable that the joint is at both ends.

The torque transmission layer is a layer mainly responsible for transmission of torque. It is preferable that the torque transmission layer exists not only at the joint portion of the shaft but also throughout the shaft. The radial reinforcing layer is a layer for reinforcing fibers by orienting fibers in the circumferential direction against the radial expansion of the joint portion of the shaft when the joint element is fitted in the joint portion of the shaft. Is. The surface layer is a layer for concealing cracks generated in the radial reinforcing layer at the joint. The surface layer may exist not only at the joints of the shaft but also throughout the shaft.

In the torque transmission layer, the orientation angle of the fiber with respect to the shaft axis is 0 to + 60 °, 0 to -60 ° or 0 ° to
A fiber reinforced resin layer in the range of ± 60 ° is preferable. Specifically, the torque transmission layer is a helically wound fiber reinforced resin layer having a fiber winding angle of 0 to ± 60 ° with respect to the shaft axis, a fiber reinforced resin layer formed by drawing the shaft in the axial direction, and a fiber with respect to the shaft axis. Angle is 0 to + 60 °
Alternatively, a unidirectional fiber-reinforced resin layer of 0 to -60 ° and 0
It is preferably at least one kind of fiber-reinforced resin layer selected from the group consisting of alternately laminated fiber-reinforced resin layers of + 60 ° and 0--60 °.

The preferred torque transmission layer includes a helically wound fiber reinforced resin layer having a fiber winding angle of 0 to ± 60 ° with respect to the shaft axis, or a fiber reinforced resin layer formed by pultrusion in the axial direction of the shaft.

The orientation angle of the fibers of the torque transmission layer with respect to the shaft axis is ± 30 ° to ± 60 ° with respect to the axial direction of the shaft for transmitting high torsional torque (same order of compound symbols).
Is preferable, and 0 ° to ± 30 in order to aim for a high resonance frequency.
The range of ° is preferable, but the fiber wrap angle can be selected in an appropriate range depending on the required characteristics.

The radial reinforcing layer is a helically wound fiber reinforced resin layer in which the winding angle of the fiber with respect to the shaft axis is ± 75 to ± 90 ° (same order of compound numbers), or the angle of the fiber with respect to the shaft axis is +75 to + 90 °. Or -75 to -90
Unidirectional fiber reinforced resin layer, or +75 to + 90 °,
A fiber-reinforced resin layer of -75 to -90 ° alternately laminated is preferable. More preferably, the radial reinforcing layer is a helically wound fiber reinforced resin layer having a fiber winding angle with respect to the shaft axis of ± 80 to ± 90 ° (same order of compound numbers), or a fiber angle with respect to the shaft axis of +80 to +90. ° or -8
0 to -90 ° unidirectional fiber reinforced resin layer, or +80 to
A fiber-reinforced resin layer of + 90 ° and alternate lamination of −80 to −90 ° is preferable.

The surface layer is preferably a fiber-reinforced resin layer whose fiber orientation angle is at least 20 ° smaller in absolute value than the fiber orientation angle of the radial reinforcement layer, or a fiber-reinforced resin layer made of resin-impregnated reinforced fiber woven fabric. .. A fiber-reinforced resin layer having an orientation smaller than the winding angle of the fiber of the radial reinforcing layer by less than 20 ° in absolute value is not preferable because the hiding of cracks in the radial reinforcing layer is insufficient.

Specifically, the surface layer is a helically wound fiber reinforced resin layer having a winding angle smaller by at least 20 ° in absolute value than the fiber orientation angle of the radial direction reinforcing layer, and an absolute value more than the fiber orientation angle of the radial direction reinforcing layer. At least 1 selected from the group consisting of unidirectional fiber-reinforced resin layers or alternating fiber-reinforced resin layers having an orientation angle smaller by at least 20 ° in value, and fiber-reinforced resin layers made of resin-impregnated reinforced fiber woven cloth
Seed fiber reinforced resin layers are preferred.

As a preferable surface layer, a helically wound fiber reinforced resin layer or a fiber reinforced resin layer made of a resin-impregnated reinforced fiber woven cloth having a winding angle smaller than the winding angle of the fibers of the radial direction reinforcing layer by at least 20 ° in absolute value. Is mentioned. Here, examples of the reinforced fiber woven fabric include woven fabrics such as plain weave, plain plain weave, twill weave, satin weave, and blind weave.
The surface layer is preferably thin as long as the effect of the present invention is not impaired.

Furthermore, it is preferable to provide a woven fabric made of chemical fiber or natural fiber on the outer layer of the surface layer. Examples of the woven cloth include woven cloth such as plain woven cloth, plain plain woven cloth, twill woven cloth, satin woven cloth, and woven cloth. When the woven cloth is provided, voids inside the fiber reinforced resin can be reduced. Further, the resin inside can be exuded to the outside through the woven fabric to coat the surface. Therefore, the surface of the surface layer becomes smoother, which is preferable.

Examples of the woven cloth made of chemical fibers include woven cloth made of synthetic fibers, semi-synthetic fibers or recycled fibers. Examples of the woven fabric made of synthetic fibers include woven fabrics made of polyester fibers, polyamide fibers, polyvinyl alcohol fibers and the like. Examples of the woven cloth made of semi-synthetic fibers include woven cloth made of acetate fibers and the like. Examples of the woven fabric made of recycled fibers include woven fabric made of viscose rayon fiber, copper ammonia rayon fiber and the like. Examples of the woven fabric made of natural fibers include woven fabric made of cotton, hemp and the like. Among these, woven fabrics made of synthetic fibers are preferable, and woven fabrics made of polyester fibers or polyamide fibers are more preferable, from the viewpoints of heat resistance, weather resistance, price, and the like.

Further, in order to suppress swelling due to a high torsional torque inside the torque transmission layer, the fiber orientation angle is a high angle, for example, an absolute value of 75 ° or more, preferably an absolute value of 80 ° or more. It is preferable to provide a resin layer.

The reinforcing fiber material of the driving force transmitting shaft used in the present invention transmits torque at the joint portion of the shaft in order to transmit high torsional torque and to increase the resonance frequency of the driving force transmitting shaft during rotation. Layers, radial reinforcement layers,
Fibers having high elastic modulus and strength are preferable both in the surface layer and in the pipe portion other than the joint portion.

Such fibers mainly include carbon fibers, glass fibers, aramid fibers and ceramic fibers. Moreover, you may use these fibers in combination of 2 or more types as needed. Fibers having a large specific strength and specific rigidity are preferable because the effect of weight reduction is remarkable. Although carbon fiber is mentioned as such an example, the hybrid use of carbon fiber and glass fiber is also preferable in terms of cost. The form of the fiber is not particularly limited, roving,
It can be used in the form of woven cloth, prepreg, etc.

The matrix resin of the driving force transmitting shaft used in the present invention is not particularly limited in the pipe portion or the joint portion of the shaft. Specifically, epoxy resins, unsaturated polyester resins, vinyl ester resins, urethane resins, phenol resins, alkyd resins, xylene resins, melamine resins, furan resins, thermosetting resins such as silicone resins, polyethylene resins, polypropylene resins, Polyvinyl chloride resin, polymethacrylate resin, ABS resin, fluorine resin, polycarbonate resin, polyester resin, polyamide resin (nylon 6, 6.6, 6.10, 6.11, 6.12)
Etc.), thermoplastic resins such as polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, polyether ether ketone resin, and polyphenylene oxide resin.

Of these, thermosetting resins, particularly epoxy resins, unsaturated polyester resins, and vinyl ester resins are preferable from the viewpoint of handleability. Moreover, you may use these resins in combination of 2 or more types as needed.

A method of manufacturing the fiber-reinforced resin driving force transmitting shaft of the present invention will be described. In particular, the case where a thermosetting resin is used as the matrix resin will be described.
In the production of a fiber-reinforced resin drive force transmission shaft that is joined to a joint element, (1) a laminated structure in which the joint portion of the shaft is a torque transmission layer / a radial direction reinforcement layer / a surface layer from the inside of the shaft to the outside. Alternatively, (2) the torque transmission layer is impregnated with a liquid thermosetting resin by a filament winding method so as to have a laminated structure of a plurality of layers (torque transmission layer / radial reinforcement layer) / surface layer,
A fiber is wound on a mandrel by helical winding with a winding angle of 0 to ± 60 °, or a fiber impregnated with a liquid thermosetting resin is formed on the mandrel by a drawing method in the axial direction of the shaft, or the shaft of the shaft is formed. A prepreg having a fiber angle with respect to the direction of 0 to + 60 ° or 0 to -60 ° or a prepreg of alternating lamination of 0 to + 60 ° and 0 to -60 ° is wound around a mandrel, and (3) as a radial reinforcing layer, filament winding The wrapping angle is ± 75 ~ while impregnating the liquid thermosetting resin by the method
The fiber is helically wound at ± 90 ° (same order of compound numbers), or the fiber angle to the axial direction of the shaft is +7.
A prepreg of 5 to + 90 ° or -75 to -90 ° or a prepreg of alternate lamination of +75 to + 90 ° and -75 to -90 ° is wound, and (4) as a surface layer, a liquid thermosetting resin by a filament winding method. While being impregnated with the fiber, the fiber is helically wound at a winding angle smaller than the orientation angle of the fiber of the radial reinforcing layer by at least 20 ° in absolute value, or at least 20 ° in absolute value from the orientation angle of the fiber of the radial reinforcing layer. Fiber reinforced by winding a unidirectional prepreg with a small orientation angle or prepregs of alternating lamination, or by winding a woven fabric of reinforcing fibers while impregnating a liquid thermosetting resin, and (5) thermosetting the resin. A method of manufacturing a resin drive force transmission shaft is preferable. Further, at this time, it is preferable that the portion of the shaft from the pipe portion to the joint portion is gently tapered.

Furthermore, it is preferable to wrap a woven cloth made of chemical fibers or natural fibers around the outer layer of the surface layer before curing. By winding the woven cloth, voids inside the fiber reinforced resin can be reduced. Further, the resin inside can be exuded to the outside through the woven fabric to coat the surface. Therefore, it is preferable to wind the woven fabric around the outer layer of the surface layer before curing, because the surface becomes smoother after the surface layer is cured.

Also, when a thermoplastic resin is used as the matrix resin, the fiber-reinforced resin driving force transmitting shaft of the present invention can be manufactured by a known method.

As a method of joining the shaft and the joint element, serration joining, polygonal joining such as hexagonal or octagonal joining, and the like can be mentioned. Here, the serration joint is formed by joining the joint portion of the joint element and the FRP shaft into a serration shape, or by cutting the joint portion of the joint element which is serrated into the inner wall of the FRP shaft. It is a method of joining and joining. The serration shape is a general term for the uneven streaks extending in the axial direction formed at the joint. Specific examples of the serration shape include a mountain shape such as a triangular shape, a square shape, or a trapezoidal shape in the cross section in the radial direction of the joint portion between the joint element and the FRP shaft.

[0031]

[Example] As carbon fiber (hereinafter sometimes referred to as CF), Sumika Hercules Co., Ltd., trade name Magnamite AS
-4W (12 kf, elastic modulus 24 ton / mm ² , strength 3
90 kg / mm ² ) was used. Glass fiber (hereinafter GF
As a result, R1150TKF08 manufactured by Asahi Fiber Glass Co., Ltd. was used. As the epoxy resin, bisphenol A type epoxy resin (Sumitomo Chemical Co., Ltd., trade name Sumiepoxy ELA-12)
Aromatic amine curing agent (manufactured by Uni Royal Co., trade name TONOX 60/40) was used for 8). As polyester woven fabric, polyester insulation tape W manufactured by JALTO Co., Ltd.
T07-05 was used.

Example 1 A mandrel made of stainless pipe having an outer diameter of 70 mm and a length of 1500 mm was mounted on a filament winding apparatus. Regarding the joint between the shaft and the joint element, at both ends, octagonal joint, that is, the shape of the radial cross section of the joint portion of the shaft and the shape of the radial cross section of the joint element are regular octagon.

Next, while GF was impregnated in the liquid epoxy resin, helical winding (fiber winding angle was ± 89
°, but this is conventionally referred to as 90 ° winding)
It was wound with a winding thickness of 0.4 mm. Next, while impregnating CF into the liquid epoxy resin, helically winding (fiber winding angle is ± 20 °) from above and winding thickness is 2.0 m.
wrapped around with m.

Next, regarding the joint portion of the shaft, GF
While impregnating with liquid epoxy resin, 90 ° from above
It was wound with a winding thickness of 4.0 mm. Furthermore, helical impregnation (fiber winding angle is ± 20 °) while impregnating CF into liquid epoxy resin over the entire shaft
The winding thickness was 0.5 mm. Finally, the polyester woven fabric was wrapped once over the entire shaft. A gentle taper was applied from the joint of the shaft to the pipe.

The laminated structure thus obtained is represented as follows. Pipe part inner layer [GF90 ° / CF ± 20 ° / polyester cloth] Outer layer thickness 0.4 mm / 2.5 mm / 0.07 mm Joint part inner layer [GF90 ° / CF ± 20 ° / GF90
° / CF ± 20 ° / polyester cloth] Outer layer thickness 0.4 mm / 2.0 mm / 4.0 mm / 0.5
mm / 0.07mm Moreover, the fiber volume content is 60 ± 2% in any case.
I adjusted it to be.

Next, the mandrel is placed in a thermosetting oven,
It was cured at 150 ° C. for 2 hours while rotating. After curing, remove from the mandrel, cut off unnecessary parts on both ends,
1100m in total length of the shape shown by reference numeral 1 in FIG.
m, joint length 50 mm, taper length 30 mm
The FRP shaft was obtained. Next, apply the joint element indicated by reference numeral 2 in FIG. 1 to the joint portion of the FRP shaft,
By press-fitting and fitting by hydraulic pressure, an FRP shaft having a shape as shown in FIG. 1 was obtained. The appearance and static torsion test of the shaft joint portion of the obtained FRP shaft after press fitting of the joint element were performed. The results are shown in Table 1.

Example 2 An FRP shaft was manufactured according to Example 1 except that the laminated structure of the joint portion was changed to that shown in Table 1. The appearance and static torsion test of the shaft joint portion of the obtained FRP shaft after press fitting of the joint element were carried out. The results are shown in Table 1.

Example 3 Helical winding of CF (fiber winding angle is ± 20 °) and 90 ° of GF were simultaneously performed at the joint portion, and the radial reinforcing member was dispersed and wound in the helical winding. ..
Regarding the amount of winding, the helical winding portion of CF was 2.5 mm alone, and the 90 ° winding portion of GF was 4.0 mm alone. An FRP shaft was manufactured according to Example 1 except for the above. The appearance and static torsion test of the shaft joint portion of the obtained FRP shaft after press fitting of the joint element were carried out. The results are shown in Table 1.

Example 4 An FRP shaft was manufactured in the same manner as in Example 1, except that the outermost layer was not wrapped with a polyester woven cloth. FR obtained
The appearance of the shaft joint after press fitting of the joint element of the P shaft and the static torsion test were performed. The results are shown in Table 1.
Shown in.

Comparative Example 1 An FRP shaft was manufactured in accordance with Example 1 except that the laminated structure of the joint portion was changed to the structure shown in Table 1. The appearance and static torsion test of the shaft joint portion of the obtained FRP shaft after press fitting of the joint element were carried out. The results are shown in Table 1.

Comparative Example 2 An FRP shaft was manufactured in accordance with Example 1 except that the laminated structure of the joint portion was changed to the structure shown in Table 1. The appearance and static torsion test of the shaft joint portion of the obtained FRP shaft after press fitting of the joint element were carried out. The results are shown in Table 1.

[0042]

[Table 1]

[0043]

The fiber-reinforced resin driving force transmitting shaft of the present invention has a surface layer on the outermost layer of the joint, in other words, on the radial direction reinforcing layer. Therefore, the generation of cracks in the radial reinforcing layer at the joint is suppressed. Furthermore, even if cracks occur in the radial direction of the reinforcing layer, the surface layer is on the outside, so the cracks are not visible in appearance, so the commercial value is not lost. Further, even if cracks occur in the radial direction of the reinforcing layer, the surface layer is on the outer side, so that intrusion of water, oil, etc. can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view of a drive force transmitting shaft that has a joint element integrated therein.

FIG. 2 is a partial cross-sectional view of the FRP shaft according to the first embodiment. (G
Illustration of F90 ° (thickness 0.4 mm) and polyester woven fabric is omitted. )

FIG. 3 is a partial cross-sectional view of an FRP shaft of Comparative Example 1. (G
Illustration of F90 ° (thickness 0.4 mm) and polyester woven fabric is omitted. )

[Explanation of symbols]

1. FRP drive force transmission shaft pipe 2. FRP driving force transmission shaft joint 3. Coupling element 4. 4. Portion of pipe with CF orientation angle of ± 20 ° Part of the CF orientation angle of the joint of ± 20 ° (torque transmission layer) 6. 6. GF orientation angle of 90 ° at the joint (radial reinforcing layer) 7. Part of the CF orientation angle of the joint ± 20 ° (surface layer)

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Claims (4)

[Claims] 1. In a fiber-reinforced resin drive force transmitting shaft that is joined to a joint element, the joint portion of the shaft is
(1) From the inner side to the outer side of the shaft, the torque transmission layer / the radial reinforcement layer / the surface layer, or the plurality of laminated layers / the surface layer of the (torque transmission layer / the radial reinforcement layer), and (2) the torque transmission layer, The fiber orientation angle with respect to the shaft axis is 0 to +6
The fiber reinforced resin layer is 0 °, 0 to −60 ° or 0 to ± 60 °, and (3) the radial direction reinforcement layer has an orientation angle of the fiber with respect to the shaft axis of +75 to + 90 °, −75 to −90 °.
Or ± 75 to ± 90 ° (same order of compound numbers), and in the surface layer (4), the orientation angle of the fiber with respect to the shaft axis is at least 20 in absolute value from the orientation angle of the fiber of the radial direction reinforcing layer. A shaft for driving force transmission made of fiber-reinforced resin, characterized in that it is a small fiber-reinforced resin layer or a fiber-reinforced resin layer made of resin-impregnated reinforced fiber woven cloth. 2. A fiber reinforced resin driving force transmission according to claim 1, wherein a layer of chemical fiber woven cloth and / or natural fiber woven cloth impregnated with resin is provided on the outer layer portion of the surface layer. shaft. 3. A manufacturing method of a fiber-reinforced resin drive force transmission shaft joined to a joint element, wherein (1) the joint portion of the shaft is a torque transmission layer / a radial reinforcement layer from the inside of the shaft to the outside thereof. In order to take a laminated structure of / surface layer or a plurality of laminated layers of (torque transmission layer / radial reinforcing layer) / surface layer, (2) the torque transmission layer is impregnated with a liquid thermosetting resin by a filament winding method. While the fiber is wound around the mandrel by helical winding with a winding angle of 0 to ± 60 °, or a fiber impregnated with a liquid thermosetting resin is formed on the mandrel by a drawing method in the axial direction of the shaft, or The angle of the fiber with respect to the axial direction of the shaft is 0 to + 60 ° or 0
-60 ° prepreg or 0 to + 60 °, 0 to -60
Wrap the prepreg of alternating layers of ° around the mandrel,
(3) As the radial reinforcing layer, while impregnating the liquid thermosetting resin by the filament winding method, the winding angle is ± 75 to ± 90 ° (double sign same order), the fiber is helically wound, or the shaft Prepreg in which the angle of the fiber with respect to the axial direction is +75 to + 90 ° or −75 to −90 ° or +75 to + 90 °, −75 to −90 °
(4) As a surface layer, while being impregnated with a liquid thermosetting resin by a filament winding method, at a winding angle smaller than the orientation angle of the fibers of the radial reinforcing layer by at least 20 ° in absolute value. ,
The fibers are wound by helical winding, or the unidirectional prepregs or the prepregs of the alternate lamination having an orientation angle smaller than the orientation angle of the fibers of the radial reinforcing layer by at least 20 ° are wound, or while being impregnated with a liquid thermosetting resin. The method for producing a driving force transmitting shaft made of fiber reinforced resin according to claim 1, wherein a woven fabric made of reinforcing fibers is wound, and (5) the resin is heat-cured. 4. One or more layers of a chemical fiber woven fabric and / or a natural fiber woven fabric in which a resin is impregnated in the outer layer portion of the surface layer,
The method for producing a driving force transmitting shaft made of fiber reinforced resin according to claim 2, wherein the resin is exuded onto the woven fabric and the resin is thermally cured.