JPH07205340A - Propeller shaft - Google Patents

Abstract

PURPOSE:To reveal an energy absorbing effect of a body sufficiently by a method wherein a compression load to act upon a joint in the axial direction is concentrated to a space between layers of a main layer and partial layer and a compression load transmission part which is allowed to peel off the main layer and partial layer from each other at the space between the layers is provided. CONSTITUTION:When a compression load is applied to a propeller shaft in its axial direction, a joint 2 is pressed to an FRP cylindrical main body 1 side, the main body 1 is spread out by force by a slope 2c of its protected part 2b and a tensile strain of a circumferential direction is generated. Then though a partial layer 1b which is on the inside is not broken since it has high tensile elongation at break, since a main layer 1a which is on the outside has the lower tensile elongation at break than that of the partial layer, the main layer 1a is broken in the first place. Ply separation is generaqted between the main layer 1a and partial layer 1b through this break. That is, the main layer 1a and partial layer 1b are separated from each other. When the break attains to this state, though the break progresses at a stretch, the partial layer 1b which is being joined to the joint 2 does not break and moved in the axial direction within the main body 1 along with its joint 2 while breaking the main layer 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller shaft (drive propulsion shaft) for automobiles and the like.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for reducing the weight of automobiles from the viewpoint of improving fuel efficiency and environmental protection. As one means for achieving this, the use of FRP (fiber reinforced plastic) propeller shafts has been studied. It has already been adopted by some. Such a FRP propeller shaft has a FRP cylindrical main body and metal joints provided by being joined to each end of the main body.

By the way, the propeller shaft of an automobile is
Since the torque generated by the engine is transmitted to the drive wheels, a torsional strength of about 100 to 400 kgf · m is required. Further, it is required that the dangerous rotation speed is about 5,000 to 15,000 rpm so as not to cause resonance at high speed rotation. Therefore, in order to satisfy these basic requirements, the FRP main body takes into consideration parameters such as the type and content of the reinforcing fibers, the arrangement direction of the reinforcing fibers, the layer configuration, the outer diameter, the inner diameter, and the wall thickness. The design is done. For example, the following is taken into consideration when selecting the arrangement direction of the reinforcing fibers. That is, mainly regarding the torsional strength,
It is most effective to arrange the reinforcing fibers at an angle of ± 45 ° with respect to the axial direction of the main body, but mainly in terms of torsional buckling strength, arrange at an angle of ± 80 to 90 ° with respect to the axial direction. Is most effective. With regard to the critical rotational speed, the reinforcing fibers are arranged in the axial direction as much as possible to increase the bending elastic modulus in the axial direction so that a high bending resonance frequency can be obtained.

As described above, the main body has the most effective arrangement direction of the reinforcing fibers with respect to the basic requirements such as the torsional strength and the critical number of revolutions. Therefore, a layer structure in which the arrangement directions suitable for these requirements are combined is provided. I will take it,
Since the problem of torsional strength can be solved from the dimensional aspect such as the outer diameter and the wall thickness, the design is usually made with priority on the critical rotational speed, which greatly depends on the reinforcing fiber arrangement direction, and the reinforcing fiber is arranged in the axial direction. On the other hand, the ratio of the layers arranged at a small angle is increased. However, this causes a problem as described below.

That is, as important as the reduction in weight,
There is a problem of ensuring the safety of passengers in the event of a collision. In recent years, the design concept of automobiles for ensuring this safety is to make the body a crushable structure and absorb the impact energy (compressive load) at the time of collision by compressive failure of the body, thereby alleviating the sudden acceleration applied to the occupant. It is governed, but FR is based on the above-mentioned idea that prioritizes the critical speed.
When the body made of P is designed, the strength against the compressive load in the axial direction is inevitably increased, the body is destroyed at the time of collision, and when the destruction progresses to reach the propeller shaft,
The propeller shaft acts like a warm rod and the effect of absorbing impact energy is impaired.

In order to solve such a problem, Japanese Patent Laid-Open No.
The -37416 invention proposes a propeller shaft in which the joint moves axially at the joint surface with the main body due to a compressive load at the time of collision, and at the same time, the joint gradually expands the entire main body from its end and breaks it. is doing. However, in this conventional propeller shaft, in order to ensure the movement of the joint, the main body and the joint must be joined together through a complicated tooth profile or a separating agent, which not only complicates the structure but also complicates the manufacturing. I cannot escape. In addition, when attempting to press-fit and join a joint in a propeller shaft having such a structure, the main body must have strength to withstand the force at the time of press-fitting.
Providing the strength for that purpose makes it difficult to spread and break the main body due to the compressive load. That is, it is difficult to satisfy the above-mentioned basic requirements and the conflicting requirements of expansion and destruction at the same time.

Japanese Patent Laid-Open No. 4-339022 discloses that
There is described a propeller shaft in which a joint moves toward the inside of the main body on the joint surface with the main body when an axial compressive load is applied, and the impact energy is absorbed by the movement resistance. However, in such a configuration, the outer diameter of the joint must be smaller than the inner diameter of the main body, which not only lowers the degree of freedom in design but also limits the amount of movement of the joint, so that the impact energy is reduced. The absorption effect of is not so great.

Thus, the conventional propeller shaft is
It is hard to say that all of them are well-balanced in terms of basic requirements such as torsional strength and dangerous rotational speed and ensuring safety of passengers in the event of a collision.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of conventional propeller shafts and to prevent the body from breaking during a collision while satisfying the basic requirements such as torsional strength and dangerous rotational speed. At the same time, it is an object of the present invention to provide a propeller shaft that can surely progress the destruction of the propeller shaft and can sufficiently exhibit the energy absorption effect by the body.

[0010]

In order to achieve the above object, the present invention has a cylindrical main body made of FRP and a joint provided at an end of the main body, the main body comprising: The main layer extending over the entire length of the main body, and at the end of the main body, including the main layer, and a partial layer provided inside the main layer, the joint, the shaft of the joint There is provided a propeller shaft including a compressive load transmitting portion that concentrates a compressive load acting in a direction between layers of the main layer and the partial layer to separate the main layer and the partial layer from each other between the layers.

Further, the present invention has a cylindrical main body made of FRP, and a joint provided at one end and the other end of the main body, the main body extending over the entire length of the main body. The main layer and the main layer, at one end of the main body, is integral with the main layer and includes a partial layer provided inside the main layer, and the joint provided at the one end acts in the axial direction of the joint. There is provided a propeller shaft including a compressive load transmitting portion that concentrates a compressive load applied between the main layer and the partial layer to separate the main layer and the partial layer from each other between the layers.

Further, according to the present invention, there is provided a FRP cylindrical main body and a joint provided at one end and the other end of the main body, the main body extending over the entire length of the main body. A main layer including a helically wound reinforcing fiber, and at one end and the other end of the main body, integrally with the main layer, and provided inside the main layer, a hoop-wound reinforcing fiber. Including a partial layer to include, the joint provided on the one end and the other end, the compressive load acting in the axial direction of the joint is concentrated between the main layer and the partial layer between the main layers and Provided is a propeller shaft including a compressive load transmitting portion that separates a partial layer from the layer.

Furthermore, the present invention has a cylindrical main body made of FRP and a joint provided at one end and the other end of the main body, the main body extending over the entire length of the main body. And a main layer containing reinforcing fibers helically wound at an angle of ± 5 to 30 ° with respect to the axial direction of the main body, at one end and the other end of the main body, integrally with the main layer, and A joint provided on the inner side of the main layer, which includes a partial layer containing a hoop-wound reinforcing fiber, and the joints provided on the one end and the other end are provided with a compressive load acting in the axial direction of the joint. Provided is a propeller shaft including a compressive load transmitting portion that concentrates between layers and the partial layer to separate the main layer and the partial layer from each other between the layers.

The compressive load transmitting portion has a downward slope facing the joint surface with the main body of the joint, or has an outer diameter not larger than the outer diameter of the partial layer and an outer end surface of the partial layer. It is preferable to have an upright surface facing to.

Further, in order to achieve the above object, the present invention has a FRP cylindrical main body and a metal joint provided at one end and the other end of the main body. A. A main layer provided over the entire length of the main body, the main layer including reinforcing fibers helically wound at an angle of ± 5 to 30 ° with respect to the axial direction of the main body; b. The main body is integrally formed with the main layer at one end and the other end, and the partial layer is provided inside the main layer and includes a hoop-wound reinforcing fiber. The joints provided at the ends are: c. A joint surface inscribed in the partial layer, and d. Adjacent to the joint surface, a compressive load acting in the axial direction of the joint is concentrated between the main layer and the partial layer to separate the main layer and the partial layer from each other between the layers, A propeller shaft having: a compressive load transmitting portion having a downward slope toward the joint surface.

Further, the present invention has a cylindrical main body made of FRP and a metal joint provided at one end and the other end of the main body, the main body comprising: a. A main layer provided over the entire length of the main body, the main layer including reinforcing fibers helically wound at an angle of ± 5 to 30 ° with respect to the axial direction of the main body; b. The main body is integrally formed with the main layer at one end and the other end, and the partial layer is provided inside the main layer and includes a hoop-wound reinforcing fiber. The joints provided at the ends are: c. A joint surface inscribed in the partial layer, and d. A compressive load acting in the axial direction of the joint, which is provided adjacent to the joint surface, is concentrated between the main layer and the partial layer to separate the main layer and the partial layer from each other between the layers. A propeller shaft having a compression load transmitting portion having a diameter equal to or less than the outer diameter of the partial layer and having an upright surface facing the outer end surface of the partial layer.

In the above, the joints are preferably joined by press fitting. Further, it is preferable that serrations extending in the axial direction of the joint are provided on the joint surface of the joint with the main body. Further, in the partial layer, the portion on the inner end face side corresponding to the outer end face has a wedge-shaped vertical cross-sectional shape, or the thickness gradually decreases from the outer end face side to the inner end face side. preferable.

The present invention will be described in more detail based on one embodiment thereof. In FIGS. 1 and 2, the propeller shaft is made of carbon fiber, glass fiber, polyaramid fiber, or other high strength, high elastic modulus reinforcing fiber. Cylindrical FRP made by strengthening thermosetting resin such as epoxy resin, unsaturated polyester resin, phenol resin, vinyl ester resin, polyimide resin and thermoplastic resin such as polyamide resin, polycarbonate resin, polyetherimide resin Body 1
Have. Metal joints 2 are press-fitted and joined to one end and the other end of the main body 1. This propeller shaft is
The shape is symmetrical when viewed from the center in the length direction.

The body 1 has a uniform inner diameter and
± 5 to 3 with respect to the axial direction extending over the entire length
Main layer 1a containing reinforcing fibers helically wound at an angle of 0 °
And at both ends of the main body 1 integrally with the main layer 1a,
Also, a partial layer provided inside the main layer 1a and including hoop-wound reinforcing fibers (the reinforcing fibers are ± 80 relative to the axial direction).
Layer 1b arranged at an angle of ˜90 °. The main layer 1a acts mainly to improve the bending elastic modulus of the main body 1 in the axial direction to increase the bending resonance frequency of the propeller shaft, increase the critical rotational speed, and improve the torsional strength. In addition, the partial layer 1b is
At each end of the main body 1 to which the joint is press-fitted and joined,
As will be described later, it provides strength to withstand the force at the time of press fitting without hindering the progress of fracture, and acts to transmit the rotational torque (torsion torque) from the joint 2 to the main body 1.
Such a body 1 can be formed by, for example, a filament winding method.

That is, a reinforcing fiber bundle impregnated with a resin is used, and the resin impregnated reinforcing fiber bundle is wound around one end of a mandrel by a hoop with a desired thickness and a desired length to form a partial layer. The fiber bundle is run to the other end of the mandrel and similarly forms a partial layer at the other end. Subsequently, the resin-impregnated fiber bundle is helically wound starting from the other end while reciprocating between the other end and the one end to form a main layer having a desired thickness. After finishing the formation of the main layer, a resin-impregnated fiber bundle can be thinly wound on the main layer with a hoop,
Then, the excess resin is squeezed out, the volume content of the reinforcing fiber is increased, and various strength and elastic modulus of the main body are further improved. In this way, each layer can be continuously formed without cutting the reinforcing fiber bundle in the middle. After the layer is formed, the resin is cured or solidified, preferably while rotating, and the mandrel is pulled out to obtain the main body.

On the other hand, the joint 2 has a joint surface 2a inscribed in the partial layer 1b and slightly shorter than the partial layer 1b. The outer diameter of the portion where the joint surface 2a is formed is slightly larger than the inner diameter of the main body 1 before press fitting, and therefore,
When the joint 2 is press-fitted into the main body 1, compressive stress acts on the joint surface 2a of the joint and tensile stress in the circumferential direction acts on the main body 1. The compressive stress and the tensile stress cause the main body 1 and the joint 2 to contact with each other. Will be joined firmly. Then, at each end of the main body 1, there is a partial layer 1b on the inner side and on the outer side a main layer 1b.
Since a is present, the tensile stress in the circumferential direction generated in the main body 1 by press-fitting is mainly taken up by the partial layer 1b. Further, the strain in the circumferential direction of the main body 1 is the largest on the inner side and is smaller on the outer side, but since the reinforcing fiber is hoop-wound, the partial layer 1b having a large tensile breaking elongation has a smaller breaking elongation than that. Since it is located inside the main layer 1a, an effective bonding state is exhibited.

Before joining, the difference in the outer diameter of the portion of the joint 2 where the joint surface 2a is formed from the inner diameter of the main body 1,
That is, the larger the press-fitting margin is, the stronger the joining force is obtained, and the more the torsional strength is improved, which is convenient for the transmission of the torsional torque, but the joining force also changes depending on the area and the surface condition of the joining surface 2a. Usually, the ratio of the press-fitting margin to the inner diameter of the main body 1 is 0.
The main body 1 of the joint surface 2a is selected in the range of 001 to 0.02.
The length in the axial direction of is not less than 1/10 of the inner diameter of the main body. Further, as shown in FIG. 2, it is very convenient to provide the joint surface 2a with a serration 2e extending in the axial direction of the joint. In addition, the purpose of improving the joining force, making slippery easier to press fit, filling the gap between the joining surface 2a and the inner surface of the partial layer 1b, and protecting the joining surface 2a from the outside air. It is also possible to apply an adhesive to the joint surface 2a in advance.

The above-mentioned joint 2 includes a ring-shaped convex portion 2b adjacent to the joint surface 2a and having an outer diameter slightly larger than the inner diameter of the main body 1, and a downward slope extending from the ring-shaped convex portion 2b toward the joint surface 2a. 2c and. These ring-shaped protrusions 2
b and the slope 2c compress the compressive load acting in the axial direction of the joint 2 between the main layer 1a and the partial layer 1b so as to separate the main layer 1a and the partial layer 1b from each other. It constitutes the load transmission part. The angle formed by the inclined surface 2c with respect to the axial direction of the main body 1 is preferably in the range of 15 to 45 °.

Now, when a compressive load in the axial direction is applied to the above-mentioned propeller shaft, as shown in FIG.
Is pushed toward the main body 1, and the main body 1 is expanded by the slope 2c of the convex portion 2b, so that tensile strain in the circumferential direction is generated. Then, the inner partial layer 1b has a high tensile breaking elongation and therefore does not break, but the outer main layer 1a has a lower tensile breaking elongation than the partial layer 1b, so that the main layer 1a breaks first. Destruction causes delamination between the main layer 1a and the partial layer 1b. That is, the main layer 1a and the partial layer 1b are separated from each other. In this state, the destruction progresses at once, but joint 2
The partial layer 1b joined to the main layer 1a moves in the axial direction of the main body 1 while destroying the main layer 1a together with the joint 2 without breaking.

In this way, the energy in the axial direction is absorbed by the destruction of the main layer 1a, but the initial fracture of the main body 1 is induced by the slope 2c of the joint 2, and the convex portion 2b expands the main layer 1a. Therefore, the angle formed by the inclined surface 2c with respect to the axial direction of the main body 1 is preferably in the range of 15 to 45 ° as described above. Also, paying attention to the progress process of the fracture, the partial layer 1b may have a wedge-shaped vertical cross-sectional shape at the inner end face side portion corresponding to the outer end face as shown in FIG. As shown in FIG. 4, it is also preferable to gradually reduce the thickness from the outer end face toward the inner end face.

FIG. 5 shows a propeller shaft according to another embodiment. In this embodiment, the inclined surface 2c of the ring-shaped convex portion 2b shown in FIG. 1 is formed as an upright surface 2d facing the outer end surface of the partial layer 1b. The outer diameter of the convex portion 2b is equal to that of the partial layer 1b. The projections 2b and the elevations 2d form a compression load transmitting portion. In such a propeller shaft, the compression load applied in the axial direction is applied from the elevation 2d facing the partial layer 1b. It is transmitted to the partial layer 1b and further transmitted to the main layer 1a. Therefore, the main layer 1a also undergoes compressive deformation, but the main layer 1a
Since there is a large difference in Poisson's ratio between a and the partial layer 1b, a shearing stress that acts to break it acts between the two layers,
The shear stress, the shear stress generated between the layers by the compressive load, and the tensile stress generated by the press-fitting of the joint 2 are 2
The layers break under the dimensional stress condition, and thereafter, the main layer 1a breaks down as shown in FIG. However, unlike the embodiment described above, it is the partial layer 1b that moves while expanding the main layer 1a, and the convex portion 2b does not participate in this expansion. The same effect can be obtained even if the outer diameter of the convex portion 2b is made smaller than that of the partial layer 1b. The upright surface 2d may or may not be in contact with the partial layer 1b.

In the above description, the main body is symmetrical in its length direction, but it is not always necessary. This is because, as will be described later, it is not always necessary to proceed with the destruction of the main body from both ends thereof at the same time. Depending on the method of joining the joint and the like, it is also possible to configure either end without the partial layer.

The joint has been described as having a serration at its joint. When such a joint is used, the joint with the main body becomes stronger, which is convenient for the transmission of torsional torque. However, depending on the joining method and the like, it is possible to use a joint having no serration.

Further, although the joints are preferably joined by press fitting, they may be joined by an adhesive, and
It is also possible to use both press-fitting and adhesive bonding.

Further, although the description has been made of the one in which the same joint is used at one end and the other end of the main body, that is, the propeller shaft which is symmetrical in the length direction, there is an advantage that the kind of parts is reduced. Since it is not always necessary to proceed with the destruction of the main body from both one end and the other end at the same time, a joint having no compressive load transmitting portion at the other end may be used. Although the joint at the other end has a shape as shown in FIG. 5 as a whole, the outer diameter of the convex portion 2b is equal to or larger than the outer diameter of the main body 1 and the outer end surfaces of the main layer 1a and the partial layer 1b are You may change to the joint which has an upright surface which contacts both. At this time, the vertical surface acts as a stopper at the time of press-fitting and as a pedestal that receives the compression load when the main body receives the compression load. Note that the other end may not be joined with the joint, but may be joined with a flange or the like for attaching the joint.

[0031]

【Example】

Example 1 A main body was molded by the filament winding method. That is, 6 carbon fiber bundles (average single yarn diameter: 7 μm, number of single yarns: 12,000, tensile strength 360 kgf / mm ² , tensile elastic modulus: 23,500 kgf / mm ² ) were aligned and hardened. And bisphenol A containing curing accelerator
70mm outer diameter, length 1, while impregnated with epoxy resin
On a 300 mm mandrel, first, 8 layers are wound around the 100 mm end portion at an angle of ± 80 ° with respect to the axial direction to form a 2.5 mm thick partial layer, and then moved to the other end portion in the same manner. A partial layer is formed, and then four layers are wound at an angle of ± 15 ° with respect to the axial direction over the entire length of the mandrel to form a main layer having a thickness of 2.5 mm. One layer of hoop winding was done at a degree.

Next, while rotating the mandrel, 180
After heating the epoxy resin for 6 hours to cure the epoxy resin and pulling out the mandrel, each end 50 mm is cut and removed, and each end has an outer diameter of 80 mm, an inner diameter of 70 mm, and a length of 1,
A 200 mm main body 1 as shown in FIG. 1 was obtained.

Next, as shown in FIG. 2, each end of the main body 1 has serrations on the joint surface, the convex portion 2b has an outer diameter of 80 mm, and the joint surface 2a has an outer diameter of 70.5 mm. Bonding surface 2a
A metal joint 2 having a length of 40 mm and an inclined surface 2c with respect to the axial direction of the main body 1 at an angle of 30 ° was press-fitted to obtain a propeller shaft of the present invention. The force required for press fitting is 7,000 kg
It was f.

Next, a torsion test was conducted on the propeller shaft, and the torsional strength was 350 kgf · m. Moreover, the critical rotation speed was 8,000 rpm, and all were sufficient as propeller shafts for automobiles.

Next, when a compressive load was applied in the axial direction, the main layer and the partial layers separated at 10,000 kgf, and the main layer started to break. After the failure, a load of 3,000 kgf was applied.
Sequential destruction progressed as shown in.

Example 2 A propeller shaft as shown in FIG. 5 was obtained in the same manner as in Example 1 except that a joint as shown in FIG. 5 was used, except that the outer diameter of the convex portion 2b was 75 mm. It was next,
When the torsion test was performed on the propeller shaft,
The torsional strength was 350 kgf · m. Moreover, the critical rotation speed was 8,000 rpm, and all were sufficient as propeller shafts for automobiles.

Next, when a compressive load was applied in the axial direction, the main layer and the partial layers separated at 11,000 kgf and the main layer started to break. After the failure, a load of 3,500 kgf was applied.
Sequential destruction progressed as shown in.

[0038]

According to the propeller shaft of the present invention, the compressive load acting in the axial direction of the joint is concentrated between the main layer and the partial layer so that the main layer and the partial layer are separated from each other between the layers. As shown in the examples, since it has the parts, it surely proceeds with the destruction of the body at the time of a collision while satisfying the basic requirements such as the torsional strength and the dangerous rotational speed required in the automobile. The energy absorption effect of the body can be sufficiently exhibited.

[Brief description of drawings]

FIG. 1 is a schematic partial vertical sectional front view showing a main part of a propeller shaft according to an embodiment of the present invention.

FIG. 2 is a schematic partial vertical sectional front view showing the joint shown in FIG.

3 is a schematic partial vertical cross-sectional front view showing the main part of the propeller shaft, showing the progress of destruction of the propeller shaft shown in FIG. 1. FIG.

FIG. 4 is a schematic partial vertical sectional front view showing a main part of a propeller shaft according to another embodiment of the present invention.

FIG. 5 is a schematic partial vertical sectional front view showing a main part of a propeller shaft according to still another embodiment of the present invention.

6 is a schematic partial vertical cross-sectional front view showing a main part of the propeller shaft, showing the progress of destruction of the propeller shaft shown in FIG. 5. FIG.

[Explanation of Codes] 1: Main body 1a: Main layer 1b: Partial layer 2: Joint 2a: Joining surface 2b: Convex part (compressive load transmitting part) 2c: Slope (compressive load transmitting part) 2d: Elevation (compressive load transmitting) Part) 2e: Serration

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B29L 31:08

Claims (12)

[Claims] 1. A FRP cylindrical main body, and a joint provided at an end portion of the main body, the main body extending over the entire length of the main body, and the end of the main body. In the part, integrally with the main layer, and including a partial layer provided inside the main layer, the joint, a compressive load acting in the axial direction of the joint between the main layer and the partial layer. A propeller shaft having a compressive load transmitting portion that concentrates between the layers and separates the main layer and the partial layers from each other between the layers. 2. A FRP cylindrical main body and a joint provided at one end and the other end of the main body, the main body extending over the entire length of the main body. At one end of the main body, integrally with the main layer, and including a partial layer provided inside the main layer, the joint provided at the one end, compressive load acting in the axial direction of the joint. A propeller shaft having a compressive load transmitting portion that concentrates between the main layer and the partial layer and separates the main layer and the partial layer from each other between the layers. 3. A helically wound body having a FRP cylindrical main body and joints provided at one end and the other end of the main body, the main body extending over the entire length of the main body. And a main layer containing reinforcing fibers, and a partial layer containing the hoop-wound reinforcing fibers provided integrally with the main layer at one end and the other end of the main body and inside the main layer. The joint provided with the one end and the other end, the compressive load acting in the axial direction of the joint is concentrated between the main layer and the partial layer between the main layer and the partial layer. A propeller shaft having a compressive load transmitting portion for separating the layers. 4. A shaft of a main body having a cylindrical main body made of FRP and a joint provided at one end and the other end of the main body, the main body extending over the entire length of the main body. A main layer including reinforcing fibers helically wound at an angle of ± 5 to 30 ° with respect to the direction, and at one end and the other end of the main body, integrally with the main layer and inside the main layer A joint layer provided with a partial layer containing hoop-wound reinforcing fibers, wherein the joint provided at the one end and the other end has a compressive load acting in the axial direction of the joint on the main layer and the partial layer. A propeller shaft having a compressive load transmitting portion that concentrates between the layers and separates the main layer and the partial layers from each other. 5. The propeller shaft according to claim 1, wherein the compressive load transmitting portion has a downward slope facing a joint surface of the joint with the main body. 6. The compression load transmitting portion according to claim 1, wherein an outer diameter is equal to or less than an outer diameter of the partial layer and has an upright surface facing an outer end surface of the partial layer. That propeller shaft. 7. A FRP cylindrical main body, and a metal joint provided by joining to one end and the other end of the main body,
The body is a. A main layer provided over the entire length of the main body, the main layer including reinforcing fibers helically wound at an angle of ± 5 to 30 ° with respect to the axial direction of the main body; b. The main body is integrally formed with the main layer at one end and the other end, and the partial layer is provided inside the main layer and includes a hoop-wound reinforcing fiber. The joints provided at the ends are: c. A joint surface inscribed in the partial layer, and d. Adjacent to the joint surface, a compressive load acting in the axial direction of the joint is concentrated between the main layer and the partial layer to separate the main layer and the partial layer from each other between the layers, A propeller shaft having: a compressive load transmitting portion having a downward slope toward the joint surface. 8. A cylindrical main body made of FRP, and a metal joint provided by joining to one end and the other end of the main body,
The body is a. A main layer provided over the entire length of the main body, the main layer including reinforcing fibers helically wound at an angle of ± 5 to 30 ° with respect to the axial direction of the main body; b. The main body is integrally formed with the main layer at one end and the other end, and the partial layer is provided inside the main layer and includes a hoop-wound reinforcing fiber. The joints provided at the ends are: c. A joint surface inscribed in the partial layer, and d. A compressive load acting in the axial direction of the joint, which is provided adjacent to the joint surface, is concentrated between the main layer and the partial layer to separate the main layer and the partial layer from each other between the layers. A propeller shaft having a compression load transmitting portion having a diameter equal to or less than the outer diameter of the partial layer and having an upright surface facing the outer end surface of the partial layer. 9. The propeller shaft according to claim 1, wherein the joint is joined by press-fitting. 10. A serration extending in the axial direction of the joint is provided on the joint surface of the joint with the main body.
The propeller shaft according to claim 1. 11. The propeller shaft according to claim 1, wherein the partial layer has a wedge-shaped vertical cross-sectional shape at a portion on the inner end face side corresponding to the outer end face. 12. The thickness of the partial layer is gradually reduced from the outer end surface side toward the inner end surface side.
One of the propeller shafts.