JP2003001717A - Frp pipe for propeller shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an FRP pipe for a propeller shaft which can improve the strength of the pipe itself in a part to which a metal part is joined. SOLUTION: The propeller shaft 1 has a fiber-reinforced resin (FRP) cylinder 2 and a joint 3, and the cylinder 2 and the joint 3 are linked together by a serration linkage. The FRP cylinder 2 has helical winding layers 7 in which reinforcing fibers are wound to form an orientation angle of ±5 to 15 degrees and a hoop winding layer 8 in which the reinforcing fibers are wound to form the orientation angle of 80 to 90 degrees. Six helical winding layers 7 are wound. The hoop winding layer 8 is arranged between the fourth (from below in Fig. 3) helical winding layer 7a of the helical winding layers 7 and the fifth helical winding layer 7b.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an FRP pipe for a propeller shaft.

[0002]

2. Description of the Related Art Conventionally, weight reduction of vehicle parts has been promoted for the purpose of improving fuel efficiency of automobiles. For example, in shaft parts such as propeller shafts, attempts have been made to use fiber reinforced resin (FRP) in place of metal.
In the case of a propeller shaft, set the shaft of the propeller shaft to F
It is made of RP and has a structure in which metal parts (also referred to as yokes) functioning as universal joints are joined to both ends thereof. A cylindrical shaft formed by a technique such as a filament winding method is used for the FRP shaft portion.

As a propeller shaft of this type, for example, Japanese Patent Laid-Open No. 2000-318053 discloses a propeller shaft 51 shown in FIG. The propeller shaft 51 includes a cylindrical shaft (FRP pipe) 52 and metal parts 53 joined to both sides thereof, and the cylindrical shaft 52 and the metal part 53 are joined by serration coupling. That is, the serration 54 is formed in advance on the outer peripheral surface of the joint portion of the metal component 53, and the serration 54 is bite into the inner peripheral surface of the cylindrical shaft 52 to joint the cylindrical shaft 52 and the metal component 53.

The cylindrical shaft 52 is formed by winding a resin-impregnated reinforcing fiber in layers, and the reinforcing fiber has an angle (orientation angle) of ± 1 with respect to the axial direction of the cylindrical shaft 52.
The helical winding layer 55 wound around 0 degrees and the orientation angle is about 9
And a hoop winding layer 56 wound at 0 degrees. The helical winding layer 55 and the hoop winding layer 56 are each wound in plural layers. The hoop winding layer 56 has a cylindrical shaft 52.
Is formed only at the end portion of and is sandwiched between the helical winding layers 55.

[0005]

A fault is formed between the layers of the reinforcing fiber due to the difference in the orientation angle, and the torque (torsion torque) from the metal part 53 through this portion causes the outer diameter of the cylindrical shaft 52. It is transmitted to the side in order. In particular, the helical winding layer 5
5 and the hoop winding layer 56 are in a state where there is a large angle difference in the orientation angle. Therefore, when torque is transmitted from the metal part 53 to the cylindrical shaft 52, the helical orientation has a large angle difference. Stress concentrates between the winding layer 55 and the hoop winding layer 56. Therefore, it is necessary to suppress the stress generated at the joint between the helical winding layer 55 and the hoop winding layer 56 during torque transmission to be small, and to secure the strength of the cylindrical shaft 52.

The present invention has been made in view of the above problems, and an object thereof is to provide an FRP pipe for a propeller shaft which can improve the strength characteristics of the pipe itself in a portion where metal parts are joined. To do.

[0007]

In order to solve the above problems, in the invention described in claim 1, an FRP pipe for a propeller shaft having a metal part functioning as a joint is joined to an end thereof. And the helical winding layer wound with the reinforcing fiber so that the angle with respect to the axial direction of the pipe is 45 degrees or less, and the angle with respect to the axial direction of the pipe is approximately 90 degrees. Reinforcing fibers are wound, and a hoop winding layer disposed at an end of the pipe in a state of being sandwiched between the helical winding layers, wherein the helical winding layer is included in a thick portion of the end of the pipe. And a hoop winding layer, the hoop winding layer is arranged radially outward of the pipe.

According to the present invention, when the torque (torsion torque) is transmitted from the metal part to the FRP pipe, the torque is transmitted while being moderated from the inside to the outside of the pipe and is received by the hoop winding layer. . By the way, since there is a large angle difference in the winding angle of the reinforcing fiber between the helical winding layer and the hoop winding layer, when torque is transmitted from the metal component to the FRP pipe,
Stress is concentrated between the helical wound layer and the hoop wound layer. However, in the thick portion at the end portion of the FRP pipe, the hoop winding layer is arranged on the outer side in the radial direction of the pipe in the portion including the helical winding layer and the hoop winding layer, so that the helical winding layer and the hoop winding layer are arranged. Since the joint portion of the layers is separated from the joint portion between the metal component and the FRP pipe, the stress applied to the joint portion between the helical winding layer and the hoop winding layer is suppressed to be small, and the strength characteristics of the FRP pipe are improved. .

As a definition, "outward in the radial direction" means that the radial center of the hoop winding layer is located on the outer peripheral side of the radial center of the thick portion of the FRP pipe, and the following claims are also the same. is there.

According to a second aspect of the present invention, in the first aspect of the present invention, the helical winding layer has alternating winding angles of the reinforcing fibers alternately for each layer, and a set of two layers having different winding angles. And the hoop winding layer is arranged between the sets of layers of the reinforcing fiber forming the helical winding layer.

According to the present invention, in addition to the function of the invention described in claim 1, since the alternating laminated structure is a winding structure effective for improving the strength, the FRP pipe is formed by alternately forming the helical wound layers. Has high strength against twisting. In addition, even if the structure adopts the alternate laminated structure,
Since the hoop winding layer is arranged between the layers of the reinforcing fiber layers of the helical winding layer, the strength balance is improved,
High strength characteristics can be obtained.

According to a third aspect of the invention, in the invention of the first or second aspect, the layer thickness of the hoop winding layer is
It is set to ¼ or more of the total layer thickness of the helical wound layer.

According to the present invention, in addition to the action of the invention described in claim 1 or 2, the layer thickness of the hoop winding layer which affects the strength of the pipe is ¼ of the total layer thickness of the helical winding layers. Since it is set to twice or more, the thickness of the hoop winding layer can be sufficiently taken and the strength of the pipe can be secured.

In the invention described in claim 4, claims 1 to 3 are provided.
In the invention according to any one of the items, a thick count is used for the reinforcing fiber, the helical winding layer is configured by a total of 6 layers, and the layer order of the helical winding layer is in the outer diameter direction of the pipe. In the order of going, the hoop winding layer is arranged between the fourth and fifth layers of the helical winding layer.

According to the present invention, in addition to the action of the invention described in any one of claims 1 to 3, a helical winding layer can be formed by winding a reinforcing fiber using a thick count as the reinforcing fiber. There are layers. By the way, depending on the specifications of the propeller shaft, it is necessary to keep the outer diameter of the FRP pipe small while ensuring the strength of the FRP pipe by securing a sufficient number of helically wound layers. When using thick count for the reinforcing fiber, if the helical winding layer is 6 layers, FRP
The outer diameter of the pipe can be kept small while ensuring the strength of the pipe. Further, since the helical wound layer has six layers and the hoop wound layer is arranged between the fourth and fifth layers of the helical wound layer, the FRP pipe has high strength characteristics against twisting torque.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION FRP embodying the present invention
One embodiment of the pipe made will be described with reference to FIGS.

FIG. 1 is a side sectional view of a propeller shaft. The propeller shaft 1 includes a cylindrical shaft (hereinafter, referred to as an FRP tubular body) 2 as an FRP pipe made of fiber reinforced resin (FRP), and joints 3 as metal parts joined to both ends thereof. . The FRP tubular body 2 and the joint 3 are joined by serration coupling in which the serration 5a is bitten into the tubular body 2 by press-fitting the joint portion 5 of the joint 3 into the FRP tubular body 2. A universal joint (not shown) (for example, a cross shaft joint) is attached to the yoke 6 of the joint 3 through a hole 6a. In this example, the distance between the joints 3 is 1000 to 1300 (m
m), the outer diameter of the FRP cylinder is within 85 (mm),
It is assumed that the propeller shaft 1 having a static maximum torque of about 1000 to 3500 (N · m) is manufactured.

The FRP cylinder 2 is made of a cylinder having a substantially constant wall thickness and is manufactured by, for example, a filament winding method. That is, after the resin-impregnated fiber is wound around the mandrel (core material) to form a tubular body, the resin impregnated in the fiber is heat-cured, and then the mandrel is pulled out to manufacture the FRP tubular body 2. Both ends of the FRP tubular body 2 are thick-walled portions that are slightly bulged outward by being reinforced by a hoop winding layer described later. Also, FRP
Since the cylindrical body 2 has high rigidity, the ratio of the fibers to the entire volume of the FRP, that is, the fiber volume content (Vf) is 7
It is formed to be about 0%.

FRP, which is the material of the FRP cylinder 2, uses carbon fiber as the reinforcing fiber and epoxy resin as the matrix resin. As the reinforcing fibers, other fibers generally called high elasticity and high strength such as aramid fibers and glass fibers may be adopted, and these fibers may be used in combination. Further, as the matrix resin, other thermosetting resins such as unsaturated polyester resin, phenol resin, polyimide resin, vinyl ester resin and the like may be adopted.

FIG. 2 is an enlarged sectional view showing one end portion of the propeller shaft. The FRP tubular body 2 has a helical winding layer 7 in which reinforcing fibers are wound so that the angle (orientation angle) formed with respect to the axial direction of the tubular body 2 is ± 5 to 15 degrees, and the orientation angle is 80.
A hoop winding layer 8 in which reinforcing fibers are wound so as to be 90 degrees.
And have. The helical winding layer 7 and the hoop winding layer 8 are formed by crushing resin-impregnated fibers (fiber bundles) with a roller or the like to have a predetermined opening width, and winding the fiber bundles around the mandrel by helical winding, and then the thick portion. It is formed by winding both end portions by hoop winding for provision, and again by helical winding and winding the fiber bundle over the entire length of the mandrel.

The helical winding layer 7 has a plurality of layers, and the orientation angles are alternately +5 to +15 degrees and -5 to -15 in each layer.
It is formed by wrapping the reinforcing fiber in a certain degree. The helical winding layer 7 is required for bending and twisting when the propeller shaft 1 is assembled and used in a vehicle.
It acts to secure characteristics such as vibration. On the other hand, the hoop winding layer 8 is also a plurality of layers, and is formed only at the end portion of the FRP tubular body 2 in a state of being sandwiched between the helical winding layers 7. By providing the hoop winding layer 8, the end portion of the FRP tubular body 2 becomes the thick portion 4a. The hoop winding layer 8 acts so as to give strength enough to withstand the force applied from the joint 3 to the end of the FRP cylinder 2 when the joint 3 is press-fitted and bonded to the end of the FRP cylinder 2.

FIG. 3 is an enlarged sectional view of the main part of the FRP cylinder 2. In the helical winding layer 7, the thickness of one layer is 0.2.
A total of 6 layers of reinforcing fibers set to a value within the range of 9 to 0.5 (mm) are wound, and the total layer thickness A of the helical winding layer 7 is a value of about 1.8 to 3.0 (mm). Has become. If the layer sequence of the helical winding layer 7 is the first layer, the second layer, ... From the bottom to the top (from the radially inner side to the outer side of the FRP cylinder 2) in FIG. 3, the hoop winding layer 8 is helically wound. It is arranged between the fourth layer 7a and the fifth layer 7b of the layer 7. At the portion of the hoop winding layer 8, the joint 3 press-fitted into the FRP tubular body 2
At a position opposite to, a total of three layers of reinforcing fibers are wound, and the total layer thickness B of the hoop winding layer 8 is about 0.9 to 2.0.
The value is (mm).

An organic fiber layer 9 is formed on the surface of the helical winding layer 7 on the outer peripheral side by circumferentially winding polyester yarn or nylon yarn. This organic fiber layer 9 clamps the helical wound layer 7 from the outer peripheral side with a predetermined tension, and this clamping action squeezes out the excess resin of the resin impregnated in the reinforcing fibers and the air existing between the fibers. Are removed (defoaming). Further, the tightening action also has an effect of tightening the helical winding layer 7 having a small orientation angle to promote impregnation of the matrix resin.

The total of the helical wound layers 7 is 6 as follows. The wall thickness of the FRP cylindrical body 2 needs to be about 1.8 to 3.0 (mm) due to the constraint of the required strength. By the way, carbon fibers called large tow are used for the reinforcing fibers forming the helical wound layer 7 and the hoop wound layer 8. The large tow is a fiber having a number of filaments of 30,000 or more.

Then, in order to manufacture the propeller shaft 1 having a suitable Vf value (about 70%), the large tow is crushed by a roller or the like to make it as flat as possible, and the spread width is about 10 (mm). I wound it around the mandrel. Since the flattening process is performed so that the spread width is about 10 (mm), one layer of the reinforcing fiber has a fiber thickness of about 0.29 (mm). The number of layers of the helically wound layer 7 is the value of the required wall thickness of the FRP cylinder 2 (1.8 to
When converted from 3.0 (mm), 6 to 10 layers can be selected.

Regarding the strength of the FRP tubular body 2, when the thickness of the tubular body 2 is the same, the strength tends to improve as the number of layers of reinforcing fibers increases, and the number of layers is preferably as large as possible. On the other hand, when the number of layers of the reinforcing fiber is 8 or 10, the strength is improved as compared with the case of 6 layers, but the degree of strength improvement is smaller as the number of layers is increased. Therefore, considering the productivity of the FRP cylinder 2, Including, it is not always advantageous to select 8 or 10 layers. There is also a desire to keep the number of layers as small as possible due to restrictions such as the diameter of the reinforcing fiber used and the outer diameter of the propeller shaft 1. Therefore, when the propeller shaft 1 having the above-mentioned specifications is manufactured by using large tow, which is an inexpensive reinforcing fiber, the optimum selection is 6 layers of the reinforcing fiber.

The hoop winding layer 8 is arranged between the fourth and fifth layers of the helical winding layer 7 as follows. A fault is formed between the layers of the reinforcing fibers due to the difference in orientation angle, and when torque (twisting torque) is transmitted from the joint 3 to the FRP cylinder 2, the torque is transmitted via this fault portion. Then, this torque is transmitted from the radially inner side to the outer side of the FRP cylinder 2 while being gradually alleviated,
It is received by the hoop winding layer 8.

Since there is a large angle difference in the orientation angle between the helical wound layer 7 and the hoop wound layer 8, when the torque is transmitted from the joint 3 to the FRP cylinder 2, the orientation angle is increased. The stress concentrates between the helical wound layer 7 and the hoop wound layer 8 having a large angle difference. Therefore, in order to suppress the local stress concentration, the joint portion (fault portion) of the helical wound layer 7 and the hoop wound layer 5 is separated from the joint portion of the joint 3 as much as possible, and the stress concentration is suppressed so that the FRP cylindrical body is formed. Two
It is necessary to secure the strength of.

From this consideration, it is considered most effective to arrange the hoop winding layer 8 in the outermost layer in order to secure the strength of the FRP cylinder 2. However, this propeller shaft 1
Then, the organic fiber layer 9 is applied to the outer periphery of the FRP cylinder 2 with a predetermined tension.
Since it is wound, if the hoop winding layer 8 is immediately below,
The organic fiber layer 9 bites into the hoop winding layer 8. Therefore, the appearance of the propeller shaft 1 is deteriorated, and it is not preferable to arrange the hoop winding layer 8 as the outermost layer. From the above, the optimal choice is to arrange the hoop winding layer 8 between the four layers and the five layers of the helical winding layer 7. Further, the thickness of the hoop winding layer 8 needs to be about 0.9 to 2.0 (mm) according to the value of the torque transmitted from the joint 3, and the hoop winding layer 8 has a diameter of the reinforcing fiber to be used. Converted from 3 layers to 7 layers.

Further, in order to obtain the desired effect by the tightening action using the organic fiber layer 9, 1.0 to 5.0
It is effective to tighten with a tension of (kgf / mm),
To obtain a suitable Vf, it is preferably 5.0 (kgf / m
m) is good. Here, in the case where the strand is an organic fiber layer of 1500d, the maximum tension is 6.5 (kgf / mm) for the polyester yarn and 7.2 (kgf / mm) for the nylon yarn due to the strength of the fiber. . With the fine count, the yarn will break under a tension of 5.0 kgf / mm. The tension of the organic fiber layer is 5.0 (kgf / m) above.
m), it is necessary to use fibers having a strand of 1500 d or more. When a strand satisfying this value is used, the thickness of the organic fiber layer 9 is about 0.1 to 0.
It is set to a value of 2 (mm).

By the way, the torque (torsion torque) transmitted from the joint 3 is transmitted from the inner diameter side to the outer diameter side while being relaxed through the faults formed between the layers of the reinforcing fiber, and by the hoop winding layer 8. Be taken. In this example, since the hoop winding layer 8 is arranged between the fourth layer 7a and the fifth layer 7b of the helical winding layer 7, the hoop winding layer 8 is located radially outward in the thick portion 4a of the FRP tubular body 2. Therefore, the joint 3 and the FRP cylinder 2 are located away from the joint 10 between them. Therefore, the torque transmitted to the hoop wound layer 8 is relatively small, and the strength characteristics of the FRP cylinder 2 are improved.

Further, since there is a large angle difference in the orientation angle between the helical wound layer 7 and the hoop wound layer 8, when the torque is transmitted from the joint 3 to the FRP cylinder 2, the helical wound layer and the hoop are wound. The stress is particularly concentrated on the joint portion 10 between the wound layer and the wound layer. However, by arranging the hoop winding layer 8 between the fourth layer 7a and the fifth layer 7b of the helical winding layer 7, the joint 10 is separated from the joint 11 between the joint 3 and the FRP cylinder 2. As a result, local stress concentration is less likely to occur at the joint portion 10, which also contributes to the improvement of the strength characteristics of the FRP cylinder 2.

Therefore, in this embodiment, the following actions and effects can be obtained. (1) The hoop winding layer 8 is the fourth layer 7a and 5 of the helical winding layer 7.
Since the hoop winding layer 8 is disposed between the layers 7b, the hoop winding layer 8 is located apart from the joint 11 between the joint 3 and the FRP cylinder 2, and the stress is easily concentrated on the helical winding layer 7 and the hoop winding layer. Similarly, the joint portion 10 with 8 is separated from the joint portion 11.
Therefore, stress concentration due to torque is less likely to occur, and the FRP
The strength characteristics of the cylinder 2 can be improved.

(2) The helical winding layer 7 has an alternating laminated structure in which the reinforcing fibers are wound so that the orientation angles of the layers are alternately +5 to +15 degrees and -5 to -15 degrees. Since this alternate laminated structure is effective in improving the strength of the FRP cylinder 2, the FRP cylinder 2 is used by using this structure.
The strength against twisting and the like can be further improved. Further, even in the structure adopting the alternate laminated structure, since the hoop winding layer 8 is arranged between the layers of the reinforcing fiber layers of the helical winding layer 7, the strength balance of the FRP cylindrical body 2 is good. Therefore, high strength characteristics can be obtained.

(3) Since the helical winding layer 7 is composed of six layers and the hoop winding layer 8 is composed of three layers, the layer thickness of the hoop winding layer 8 is half that of the helical winding layer 7. It becomes
Therefore, it can be considered that the layer thickness of the hoop winding layer 8 that affects the strength of the FRP cylinder 2 is sufficiently ensured, and thus the strength of the FRP cylinder 2 when the joint 3 is press-fitted can be sufficiently ensured.

(4) A large number (large tow) is used as the reinforcing fiber, and the helical wound layer 7 is made up of 6 layers.
The hoop winding layer 8 is arranged between the fourth layer 7a and the fifth layer 7b. By the way, the helical winding layer 7 tends to improve the strength of the FRP cylindrical body 2 as the number of layers increases, but if the number of layers is too large, the outer diameter of the FRP cylindrical body 2 becomes large. . Therefore, it is necessary to suppress the outer diameter of the FRP tubular body 2 as small as possible while ensuring the strength of the FRP tubular body 2. However, when the large tow is used as in this example, if the helical wound layer 7 has six layers. Both of these requirements can be met.

(5) Since large tow is used as the reinforcing fiber, the number of layers when manufacturing the FRP cylinder 2 is relatively small (6 layers in this example), and the productivity of the FRP cylinder 2 is high. it can.

The embodiment is not limited to the above, and may be modified into the following modes, for example. The number of layers of the helical winding layer 7 is not limited to 6 and a value other than 6 may be adopted. For example, the helical winding layer 7 may be 8 layers, and the hoop winding layer 8 may be disposed between the 6th and 7th layers. Further, the number of layers of the helical winding layer 7 may be 10 and The hoop winding layer 8 may be arranged between the eighth layer and the eighth layer. The hoop winding layer 8 is also not limited to 3 to 7 layers (3 layers in the embodiment), and the number of layers other than these values may be adopted. In short, the number of layers of the helical winding layer 7 and the hoop winding layer 8 is not particularly limited as long as the hoop winding layer 8 is located on the radially outer side of the FRP cylinder 2.

The total thickness A of the helical winding layer 7 is about 1.
It is not limited to a value of 8 to 3.0 (mm) and a total thickness B of the hoop wound layer 8 of about 0.9 to 2.0, and the helical wound layer 7 or The total layer thickness A and B of the hoop winding layer 8 may be set. That is, as long as the hoop wound layer 8 is located on the radially outer side of the FRP tubular body 2, the total layer thicknesses A and B of the helical wound layer 7 and the hoop wound layer 8 are not particularly limited.

As the reinforcing fibers, fibers having different diameters may be freely selected. Although large tow, which is a thick count, was used as the carbon fiber, a fine count may be used in addition to this.

In the embodiment, the helical winding layer 7 is 6
By making the layers and the hoop winding layer 8 into three layers, the hoop winding layer 8 has a half layer thickness of the helical winding layer 7. However, the layer thickness ratio between the helical winding layer 7 and the hoop winding layer 8 is Not limited to values. That is, in order to sufficiently secure the strength of the end portion of the FRP tubular body 2, if the layer thickness of the hoop winding layer 8 is 1/4 or more of the layer thickness of the helical winding layer 7. Good. An upper limit may be set for the ratio of the hoop wound layer 8 to the helical wound layer 7, and the hoop wound layer 8 has a layer thickness less than twice that of the helical wound layer 7, that is, less than the same layer thickness as the helical wound layer 7. It may be set in. In this case, the layer thickness of the hoop winding layer 8 does not have to be excessively thick, and the helical winding layer 7 and the hoop winding layer 8 can be combined with a suitable thickness.

The orientation angle of the helical winding layer 7 is ± 5 to 15
The value is not limited to the value of the degree, and any value may be adopted as long as it is a value of ± 45 degrees or less according to the specifications of the propeller shaft 1, that is, required strength characteristics, twist characteristics, and the like.

The helical winding layer 7 is not limited to the cross-laminated structure in which the orientation angles of the reinforcing fibers are alternately changed in each layer, and for example, the helical winding layer 7 has a cross structure in which the orientation angles are alternately changed in the same layer. Good.

The method of manufacturing the FRP cylinder 2 is not limited to the filament winding method, and for example, the sheet winding method may be adopted. In other words, in order to satisfy the characteristics required when the cylindrical shaft is used as a component, F
If the RP cylinder 2 can be manufactured, the manufacturing method thereof is not particularly limited.

The resin used for the FRP cylinder 2 is not limited to a thermosetting resin such as an unsaturated polyester resin or a phenol resin, but other resin such as an ultraviolet curable resin may be adopted. Further, the resin impregnated into the reinforcing fibers is not limited to the thermosetting resin, and a thermoplastic resin such as a polyamide resin, a polycarbonate resin, or a polyetherimide resin may be used.

The size of the propeller shaft 1 is not limited to the specifications described in the embodiments, and the structure of this embodiment may be adopted when manufacturing propeller shafts of other sizes.

The technical ideas that can be understood from the above-described embodiment and other examples will be described below along with their effects. (1) A FRP pipe for a propeller shaft, to which a metal part that functions as a joint is joined at its end,
The helical wound layer is formed by winding the reinforcing fibers so that the angle formed with respect to the axial direction of the pipe is 45 degrees or less, and the reinforcing fiber is formed so that the angle formed with respect to the axial direction of the pipe is approximately 90 degrees. And a hoop winding layer arranged at the end of the pipe in a state of being wound and sandwiched between the helical winding layers,
The helical wound layer is formed of a FRP pipe for a propeller shaft in which a layer thickness of a portion located radially outside of the hoop wound layer is thinner than a layer thickness of a portion located radially inside thereof. . In this case, the stress applied to the joint between the helical wound layer and the hoop wound layer is suppressed to a small level, and the strength characteristics of the FRP pipe are improved.

(2) In Claims 1 to 4, the organic fiber layer is provided on the outer peripheral side of the helical wound layer and acts to tighten the helical wound layer. In this case, the tightening action of the organic fiber layer can squeeze out the excess resin of the resin impregnated in the reinforcing fibers and remove the air existing between the fibers.

(3) In claims 1 to 4, the total number of the helical winding layers is set to 6 to 10.
In this case, the strength of the FRP pipe against twist is determined by the number of layers of the pipe, but the total number of layers of the helical winding layer is 6
Since the number of layers is set to 10 to 10, the strength can be sufficiently satisfied.

(4) In claims 1 to 4, the total layer thickness of the helical wound layer is set to a value within the range of 1.8 to 3.0 mm, and the total layer thickness of the hoop wound layer is 0. .9-
It is set to a value within the range of 2.0 mm. in this case,
The helical wound layer and the hoop wound layer can be combined with suitable values.

(5) In Claims 1 to 4, the pipe and the metal component are joined by serration coupling. In this case, the metal parts can be joined to the FRP pipe by serration connection.

(6) In Claims 2 to 4, only one set of the helical wound layer is arranged radially outward of the hoop wound layer. In this case, the appearance of the FRP pipe is less likely to deteriorate.

(7) In claim 3 or 4, the layer thickness of the hoop wound layer is 1 of the total layer thickness of the helical wound layer.
/ 4 to less than 1 time. In this case, the layer thickness of the hoop winding layer does not have to be excessively thick, and the helical winding layer and the hoop winding layer can be combined with a suitable value.

[0054]

As described above in detail, according to the present invention, F
In the thick portion at the end of the RP pipe, the hoop winding layer is arranged on the radially outer side of the pipe in the portion consisting of the helical winding layer and the hoop winding layer, so that in the portion where the metal parts are joined. The strength characteristics of the FRP pipe can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a propeller shaft according to an embodiment.

FIG. 2 is an enlarged cross-sectional view showing one end portion of a propeller shaft.

FIG. 3 is an enlarged sectional view of an essential part of the FRP cylinder body 2.

FIG. 4 is a side sectional view of a conventional propeller shaft.

[Explanation of symbols]

1 ... Propeller shaft, 2 ... F as FRP pipe
RP cylindrical body, 3 ... Joint as metal part, 4a ... Thick portion,
7 ... Helical winding layer, 8 ... Hoop winding layer.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshiharu Yasui             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Company Toyota Loom Works F term (reference) 3J033 AA01 AB02 BA01 BC03                 4F205 AA36 AA39 AD16 AG08 AH17                       HA02 HA33 HA37 HB01 HL12                       HL14 HL25 HT02 HT22

Claims (4)

[Claims] 1. A FRP pipe for a propeller shaft, the end of which is joined with a metal part that functions as a joint, and is reinforced so that an angle formed with respect to the axial direction of the pipe is 45 degrees or less. The helical wound layer in which the fiber is wound, and the reinforcing fiber is wound so that the angle formed with respect to the axial direction of the pipe is approximately 90 degrees, and the end of the pipe is sandwiched between the helical wound layers. A hoop winding layer disposed in a portion of the pipe, in the thick portion of the end portion of the pipe, the portion consisting of the helical winding layer and the hoop winding layer, the hoop winding layer in the radially outer side of the pipe. FRP pipe for the propeller shaft that is placed. 2. The helical winding layer has an alternating laminated structure in which the winding angle of the reinforcing fiber is alternately changed for each layer and a plurality of two-layer one set having different winding angles is provided, and the hoop winding layer is The FRP pipe for a propeller shaft according to claim 1, wherein the FRP pipe is arranged between a set of layers of reinforcing fibers constituting the helical wound layer. 3. The FRP pipe for a propeller shaft according to claim 1, wherein the layer thickness of the hoop winding layer is set to ¼ or more of the total layer thickness of the helical winding layer. . 4. A thick count is used for the reinforcing fiber, and when the helical winding layer is composed of a total of 6 layers, and the layer order of the helical winding layer is the order toward the outer diameter direction of the pipe, the helical The FRP pipe for a propeller shaft according to any one of claims 1 to 3, wherein the hoop winding layer is arranged between a fourth layer and a fifth layer of the winding layer.