JP3402255B2 - Universal joint of propeller shaft and propeller shaft - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle propeller shaft, and more particularly to a universal joint having metal yokes internally fitted and joined to both ends of a shaft portion made of FRP.

[0002]

2. Description of the Related Art A propeller shaft for transmitting a rotational power generated by a vehicle engine to a vehicle drive wheel is generally connected to a drive shaft and a driven shaft at both ends of a shaft member made of a solid metal rod or a hollow metal pipe. A metal universal joint yoke (for example, welded) is used (hereinafter referred to as a metal propeller shaft).

In recent years, further weight reduction of each structural member has been required in order to reduce the weight of a vehicle, and the propeller shaft is also reduced in weight by switching to a fiber reinforced plastic (FRP) type. Such an FRP propeller shaft has a structure in which a yoke of a metal universal joint that is connected to a drive shaft and a driven shaft is press-fitted and joined to both ends of an FRP shaft member (that is, an FRP tubular body).

Therefore, the yoke of the universal joint used in the FRP propeller shaft requires a connecting portion for press-fitting and joining to both ends of the FRP cylindrical body.
FIG. 4 shows an example of a universal joint yoke used in this FRP propeller shaft. As shown in FIG. 4, the yoke 31 of the universal joint used in the propeller shaft made of FRP is the connecting portion 32 that connects the left side portion of the alternate long and short dash line K to the drive shaft and the driven shaft, and the right side portion of the alternate long and short dash line K is The joining portions 33 are used for press-fitting and joining to both ends of the FRP cylinder. The connecting portion 32
Is equivalent to the yoke of the universal joint used in metal propeller shafts. In other words, F
The universal joint yoke 31 used for the RP propeller shaft is similar to the FRP for the universal joint yoke used for the metal propeller shaft.
It has a structure in which joint portions 33 for press-fitting and joining are formed to extend at both ends of the cylindrical body.

[0005]

By the way, the thickness of the propeller shaft changes according to the mounting space of the vehicle, and the wall thickness also changes according to the operating torque of the vehicle. The inner diameter of the propeller shaft changes accordingly. Therefore, the outer diameter of the joint portion 33 of the yoke 31 used in the FRP propeller shaft also changes according to the inner diameter of the propeller shaft.

Conventionally, in the yoke 31 of the universal joint, the connecting portion 32 and the joint portion 33 are integrally formed by forging or the like. In order to flexibly adapt the outer diameter of the joint portion 33 of the yoke 31 to the change in the inner diameter of the propeller shaft, the joint portion 3 of the forging die for the yoke 31 is used.
The diameter of 3 had to be set larger. Also,
When the outer diameter of the joint portion 33 becomes larger than the set value,
I had to design and manufacture a new forging die. Further, the shape (size) of the connecting portion 32 such as a spline yoke or a flange yoke is different depending on the vehicle type,
Different forging dies for the yoke 31 have been required accordingly. These lead to an increase in the manufacturing cost of the universal joint, that is, the propeller shaft (particularly in the case of a small-volume production vehicle model), which has been a problem.

Further, since the propeller shaft is required to have a high rotational balance property, that is, a dynamic balance property so as not to shake during power transmission rotation, a balance weight made of metal such as iron is welded to the outer periphery of the propeller shaft. It is necessary to attach it by the method such as. Since the balance weight cannot be attached to the FRP cylinder by changing the propeller shaft to FRP, the yoke 31
It was necessary to attach a balance weight to.

Therefore, a first object of the present invention is to prepare the connecting portion and the joining portion as separate members in advance, and integrally join the member serving as the joining portion and the member serving as the joining portion (for example, friction welding). By providing the yoke of a universal joint by doing so, it is an object of the present invention to provide a universal joint of a propeller shaft and a propeller shaft that can reduce costs.

A second object of the present invention is to provide a universal joint for a propeller shaft which can secure a place for attaching a balance weight, that is, can improve the manufacturability.

[0010]

In order to solve the above problems, the invention according to claim 1 relates to a joint portion which is internally fitted and joined to an end portion of a FRP cylinder, and a drive shaft of a drive source or a cover. In a universal joint of a propeller shaft having a yoke having a connecting portion for connecting a driven shaft of a drive portion, the yoke is joined by a joining member serving as a joining portion and the joining member serving as a joining portion by friction welding . is not formed, the
A cylindrical connecting member side connecting portion is formed on the connecting member, and
The joining member is formed with a joining member side joining portion, and the joining member is formed.
The outer diameter of the side joint is the outer diameter of the minimum outer shape of the joint side joint.
The main idea is to set it smaller .

A second aspect of the present invention is summarized in the universal joint of the propeller shaft according to the first aspect, wherein the joint member side joint portion is solid .

The invention according to claim 3 relates to an FRP cylinder body.
The joint that is internally fitted to the end and the drive shaft of the drive source or the driven
A yoke having a connecting portion for connecting the driven shaft of the moving portion
In the universal joint that the propeller shaft, a joining member of the yoke, and each joint,
Formed by connecting the connecting member that will become the connecting part with welding means
Then, a cylindrical connecting member side connecting portion is formed on the connecting member, a connecting member side connecting portion is formed on the connecting member, and an outer diameter of the connecting member side connecting portion is set to a minimum value of the connecting member side connecting portion. Set smaller than the outer diameter of the outer shape, and the joint on the joining member side is a cylinder
The connecting member side connecting portion having an outer diameter
Set smaller than the outer diameter of the side coupling part, and
The inner diameter of the side joint is the same as or smaller than the inner diameter of the joining member side joint.
The gist is that it is set to be larger than the inner diameter of the coupling member side coupling portion .

According to a fourth aspect of the invention, in the universal joint of the propeller shaft according to the third aspect, the outer peripheral surface of the coupling member side coupling portion is a balanceway.
The gist is that it is a place to attach a toe .

According to a fifth aspect of the present invention, there is provided an FRP cylindrical body.
The joint that is internally fitted to the end and the drive shaft of the drive source or the driven
A yoke having a connecting portion for connecting the driven shaft of the moving portion
In the universal joint that the propeller shaft, a joining member of the yoke, and each joint,
Formed by connecting the connecting member that will become the connecting part with welding means
Then, the connecting member is formed with a cylindrical connecting member side connecting portion.
And forming a joining member side joining portion on the joining member,
The outer diameter of the joint on the connecting member side is the minimum outer shape of the joint on the joining member side.
The gist is that the outer diameter of the connecting member side coupling portion is set as a place for attaching the balance weight.

The invention according to claim 6 is the invention according to claims 3 to 5.
Universal of the propeller shaft according to any one of 1.
In the joint, join the joining member and the connecting member
The gist of the welding means is friction welding. A seventh aspect of the invention is summarized as including the universal joint according to any one of the first to sixth aspects. (Operation) According to the first and second aspects of the invention, the FR that changes according to changes in the vehicle mounting space, the operating torque, or the vehicle type.
When the outer diameter of the joint changes according to the inner diameter of the P cylinder,
Flexibility can be achieved simply by changing the outer diameter of the joining member. Also, the vertical cross-sectional area of
Since it is smaller than the vertical cross-sectional area of the joint part side joint part, the connecting part
Connect while aligning the central axis of the material with the central axis of the joining member
Join the member side joint to the member side joint by friction welding.
Then, the connecting member side connecting part will melt and the joining member side connecting
Come to join the department. At this time, the pressure welding burr is
Joining on the connecting member side without exceeding the outer peripheral surface of the joining part on the material side
Of the step formed on the joint surface between the joint and the joint side joint
Will be formed.

According to the third aspect of the invention, the vehicle
It changes according to the installation space, torque used or vehicle type.
The outer diameter of the joint changes according to the inner diameter of the FRP cylinder.
Flexibly by changing the outer diameter of the joining member.
Can respond. Further, since the vertical cross-sectional area of the connecting member-side connecting portion is smaller than the vertical cross-sectional area of the joining member-side connecting portion,
When the connecting member side connecting portion is connected to the connecting member side connecting portion by welding means while aligning the central axis of the connecting member with the central axis of the connecting member, the connecting member side connecting portion is melted and connected to the connecting member side connecting portion. Like At this time, the pressure contact burrs are formed near the corners of the step formed on the joint surface between the joint member side joint portion and the joint member side joint, without exceeding the outer peripheral surface of the joint member side joint portion. .

According to the invention of claim 4 , claim 3
In addition to the effect of the invention described in (1), the outer periphery of the connecting member side coupling portion having a small outer diameter is used as a place for attaching the balance weight. At this time, burrs generated when the coupling member-side coupling portion and the joining member-side coupling portion are coupled are formed near the corners of the step formed on the coupling surface between the coupling member-side coupling portion and the coupling member-side coupling portion. Since it is supposed to be, it is possible to secure a place to attach the balance weight. As a result, the manufacturability of the universal joint can be improved.
According to the invention described in claim 5, a vehicle mounting space,
FRP cylinder that changes according to changes in used torque or vehicle type
When the outer diameter of the joint changes according to the inner diameter of the body,
Flexible by simply changing the outer diameter of the material
it can. In addition, the vertical cross-sectional area of the connecting portion on the connecting member side is the joining member.
Since it is smaller than the vertical cross-sectional area of the side connection part,
Connecting member side while aligning the core axis with the central axis of the joining member
Joining the joining part to the joining part side joining part by welding means
And the joining part on the joining member side melts into the joining part on the joining member side.
Come to join. At this time, the pressure welding burr is on the joining member side.
Without exceeding the outer peripheral surface of the joint,
Close to the corner of the step formed on the joining surface with the joining member side joining part.
Will be formed. Also, a connecting part with a small outer diameter
Use the outer circumference of the material side joint as the place to attach the balance weight.
did. At this time, the connecting member side joining portion and the joining member side joining portion
The burrs generated when and are connected to the connecting part side connecting part.
Close to the corner of the step formed on the joint surface with the joint side
Balance weight because it is supposed to be formed by
You can secure a place to attach. As a result, Uni
It is possible to improve the manufacturability of Versal joints.
It

According to the invention of claim 6, claim 3
It is possible to obtain the action of the invention described in any one of
Wear. According to the invention described in claim 7, claim 1 to 6
In addition to the effect of the invention described in any one of 1 , the cost of the propeller shaft can be reduced.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. The shaft portion of the propeller shaft in the present embodiment has a fiber-reinforced resin (FR).
P).

As shown in FIG. 1, a propeller shaft 10 of the present invention includes a cylindrical shaft 11 made of fiber reinforced resin (FRP) (that is, an FRP cylindrical body) 11 and a metal universal joint joined to both ends thereof. 12 and. Cylindrical shaft 1
1 and the universal joint 12 are serrated. In addition, metal universal joint 1
Although No. 2 is joined to both ends of the cylindrical shaft 11, the structure of the cylindrical shaft 11 at both ends and the configuration of the universal joint 12 joined to both ends thereof are the same, and therefore, in the present embodiment, description will be made. For the sake of convenience, the joining of the universal joint 12 on the engine drive shaft side and the cylindrical shaft 11 will be described, and the explanation of the joining of the universal joint 12 on the driven shaft side and the cylindrical shaft 11 will be omitted.

The cylindrical shaft 11 is composed of a cylinder having a substantially constant wall thickness, and is formed by, for example, a filament winding method. The end portion of the cylindrical shaft 11 is reinforced with a tightening thread to become a thick portion that bulges slightly outward. That is, after the resin-impregnated fiber is wound around a mandrel (core material) to form a cylinder, the resin impregnated in the fiber is heat-cured, and then the mandrel is extracted to form the cylindrical shaft 11.

The FRP, which is the material of the cylindrical shaft 11, uses carbon fiber as the reinforcing fiber and epoxy resin as the matrix resin. It should be noted that as the reinforcing fiber, other fibers such as aramid fiber and glass fiber, which are generally said to have high elasticity and high strength, are adopted, and as the matrix resin, other thermosetting resin such as unsaturated polyester resin, phenol resin and polyimide resin is used. Resin can be adopted.

The universal joint 12 is shown in FIG.
Further, as shown in FIG. 2, the engine-side connecting shaft 13 and the yoke 14 are provided. The engine side connecting shaft 13 is drivingly connected to the output shaft of the engine. The yoke 14 is provided with a joint portion 14 a that is press-fitted and connected to the end portion of the cylindrical shaft 11 and a connecting portion 14 b for connecting to the engine-side connecting shaft 13. Serrations 14c are provided on the outer peripheral surface of the joining portion 14a. Then, the joint portion 14 of the yoke 14
a is press-fitted into the cylindrical shaft 11 by a known method, and the serrations 14c of the joint portion 14a are cut into the inner peripheral surface of the cylindrical shaft 11, whereby the universal joint 12
The yoke 14 and the cylindrical shaft 11 are integrally joined as shown in FIG.

Next, a method of manufacturing the yoke 14 will be described. The yoke 14 is a joining member 1 as shown in FIG.
5 and the connecting member 16 are integrally formed.

The joining member 15 is formed by digging a hole from a cylindrical iron bar material in the axial center portion of the iron bar material. As shown in FIG. 3, the serration portion 14c is formed on the outer periphery of a predetermined area of the joining member 15 on the side (the right side in FIG. 3) to be joined with the cylindrical shaft 11. Further, the joining member side joining portion 14d having a smaller diameter (the outer diameter is r1) than the serration portion 14c is formed in the axial portion (left side portion in FIG. 3) of the joining member 15 other than the serration portion 14c. Then, the end surface 1 of the joining member-side joining portion 14d
4e to a through hole 14f having an inner diameter r2, and the through hole 14f
f is communicated with a tapered recess 14g provided inside the joining member 15.

The connecting member 16 is the engine-side connecting shaft 1.
3 is composed of a claw portion 16a for connecting 3 and a connecting member side connecting portion 16b for connecting with the joining member 15.
It is formed by forging. The claw portion 16a is provided with a through hole 16c for connection. Connecting member side coupling portion 16b
Is formed into a cylindrical shape, the outer diameter of which is r3 and the inner diameter of which is r4. In this embodiment, r3 <r1, r4
> R2 is set. That is, the vertical cross-sectional area of the coupling member side coupling portion 16b is set smaller than the vertical cross-sectional area of the joining member side coupling portion 14d.

While aligning the central axis L1 of the connecting member 16 with the central axis L2 of the joining member 15, the annular end surface 16d of the joining member side joining portion 16b is joined to the joining member side joining portion 14d.
The connecting member 16 and the joining member 15 are integrated by being joined to the annular end surface 14e by friction welding as a welding means, and the yoke 14 including the joining portion 14a and the joining portion 14b is formed. The connection by friction welding is performed using a friction welding device.

Further, in the present embodiment, the outer peripheral surface of the connecting member side joint portion 16b is used as a place for attaching a balance weight (not shown). According to the universal joint 12 and the propeller shaft 10 of the present embodiment, the following features can be obtained.

(1) In this embodiment, the yoke 14 of the universal joint 12 includes the joining member 15 and the connecting member 1.
It is made by combining 6 different members. Therefore, the joining member 15 and the connecting member 16 can be easily made from commercially available materials, and the inner diameter of the cylindrical shaft 11 that changes according to the mounting space of the vehicle, the torque used, or the type of vehicle changes. When, the joint portion 1 of the yoke 14
The outer diameter of 4a, that is, the outer diameter of the serration portion 14c, can be changed in a flexible manner.

As a result, the manufacturing cost of the yoke 14, that is, the universal joint 12, can be reduced as compared with the conventional technique which requires a large number of forging dies. Further, since the connecting member 16 can use the universal joint used in the existing (or conventional) metal propeller shaft as it is, the existing production equipment and process can be used as it is. The manufacturing cost of can be reduced significantly. As a result, the cost of the propeller shaft 10 can be reduced.

(2) In the present embodiment, the joining member 15 serving as the joining portion 14a of the yoke 14 is provided with the cylindrical joining member side joining portion 14d, and the joining member 16 serving as the joining portion 14b of the yoke 14 is formed. Is a cylindrical connecting member side coupling portion 16
b is formed. Further, the inner diameter r4 of the connecting member side joint portion 16b is set to be larger than the inner diameter r2 of the joint member side joint portion 14d, and the outer diameter r3 of the joint member side joint portion 16b is set to be smaller than the outer diameter r1 of the joint member side joint portion 14d. is doing.
That is, the vertical cross-sectional area of the connecting member-side connecting portion 16b is set smaller than the vertical cross-sectional area of the joining member-side connecting portion 14d.

Therefore, as shown in FIG.
When the annular end surface 16d of the connecting member side connecting portion 16b is connected to the annular end surface 14e of the connecting member side connecting portion 14d by friction welding while aligning the central axis line L1 of the connecting member 15 with the central axis line L2 of the connecting member 15, the connecting member side connecting portion 16b annular end surface 16d
While melting, the annular end surface 14e of the joining member side coupling portion 14d
Will be combined with. At this time, the connecting member side coupling portion 1
Since the outer diameter r3 of 6b is smaller than the outer diameter r1 of the joining member side joint portion 14d, the pressure contact burr 17 does not exceed the outer peripheral surface of the joining member side joint portion 14d as shown in FIG. It is formed near the corner of the step formed on the pressure contact surface between the portion 16b and the joining member side coupling portion 14d.

As a result, since it is not necessary to remove the pressure contact burr 17, the number of manufacturing steps of the yoke 14, that is, the universal joint 12 can be reduced, and the cost of the universal joint 12 and the propeller shaft 10 can be reduced.

(3) Further, in the case of a yoke formed by pressure-welding a pipe having the same diameter, a pressure-contact burr is generated on the outer periphery of the pressure-contacted pipe, and an extra processing step is required to remove the pressure-contact burr. At the same time, there is no place to attach the balance weight on the outer circumference of the pipe. On the other hand, in the present embodiment, since the outer peripheral surface of the connecting member side coupling portion 16b has a smaller diameter than the outer diameter of the joining member side coupling portion 14d, the balance weight can be a mounting location that does not stick out. .

That is, a pressure contact burr generated when the connecting member side connecting portion 16b and the connecting member side connecting portion 14d are pressed against each other is formed on the pressure contact surface between the connecting member side connecting portion 16b and the connecting member side connecting portion 14d. Since it is formed near the corners of the corners, it is possible to secure a place for attaching the balance weight on the outer peripheral surface of the coupling member side coupling portion 16b without being blocked by the pressure contact burr. As a result, the manufacturability of the yoke 14, that is, the universal joint 12 can be improved.

The embodiment of the invention is not limited to the above, and may be carried out in the following forms. In the above embodiment, the connecting portion 14b (or the connecting member 16) of the yoke 14 that constitutes the universal joint 12 is used.
1 is carried out in a shape as shown in FIGS. 1 to 3, but it is not limited to such a shape and may be carried out in another shape.
In this case, the same effects as the effects described in the features (1) to (3) of the above embodiment can be obtained.

In the above embodiment, the connecting member side connecting portion 1
Although the inner diameter r4 of 6b is set to be larger than the inner diameter r2 of the joining member side coupling portion 14d, the coupling member side coupling portion 16b is used.
The inner diameter r4 may be set to be the same as the inner diameter of the joining member side coupling portion 14d. In this case, the same effects as the effects described in the features (1) to (3) of the above embodiment can be obtained.

In the above embodiment, the joining member side joining portion 1
4d was carried out in a cylindrical shape, but the joining member side coupling portion 14d
May be a solid circle. Furthermore, the vertical cross-sectional shape of the joining member side coupling portion 14d is not limited to a circular shape, and may be, for example, an elliptical shape, a triangular shape, a square shape, or the like. In these cases, if the outer diameter of the minimum outer shape of the joining member side coupling portion 14d is set to be larger than the outer diameter of the coupling member side coupling portion 16b, the effects described in the features (1) to (3) of the above-described embodiment are almost obtained. Similar effects can be obtained.

In the above embodiment, the serration portion 14c is provided on the outer periphery of the joining member 15, but the serration portion 14c is omitted, that is, the yoke 14 is used.
May be joined to the cylindrical shaft 11 by a joining method other than serration, for example, an adhesive joining method using an adhesive. In this case, the same effects as the effects described in the features (1) to (3) of the above embodiment can be obtained.

In the above embodiment, the joining member 15 and the connecting member 16 are integrally joined by friction welding to form the yoke 1
However, the joining member 15 and the connecting member 16 are not limited to friction welding, but may be integrally joined by other welding means such as ordinary welding to form the yoke 14. You may. In this case, the same effects as the effects described in the features (1) to (3) of the above embodiment can be obtained.

In the above embodiment, the universal joints 12 are joined to both ends of the cylindrical shaft 11, but the universal joint 12 is joined to only one end of the cylindrical shaft 11 (for example, the engine drive shaft side). You may implement so. In this case, it is possible to obtain substantially the same effects as the effects described in the features (1) to (3) of the above embodiment.

Further, the yoke 14 may be applied to a spline yoke or a flange yoke. In this case, the same effects as the effects described in the features (1) to (3) of the above embodiment can be obtained.

In the above embodiment, the FRP matrix resin is not limited to the thermosetting resin. For example, an ultraviolet curable resin or a thermoplastic resin can be used as the matrix resin.

In the above embodiment, the method for manufacturing the FRP cylinder is not limited to the filament winding method.
For example, the sheet winding method can be adopted. The manufacturing method is not particularly limited as long as the FRP cylinder can be manufactured so as to satisfy the required characteristics when the shaft is used as a component.

[0045]

As described above in detail, according to the inventions described in claims 1 and 2, the manufacturing cost of the universal joint can be significantly reduced. Also, the universal
The cost of the lu joint can be further reduced.

[0046] According to the invention described in claim 3, universes
It is possible to significantly reduce the manufacturing cost of monkey joints.
Wear. Further, the cost of the universal joint can be further reduced. According to the invention described in claim 4 , in addition to the effect of the invention described in claim 3, the manufacturability of the universal joint can be improved. Claim
According to the invention of Item 5, the universal joint
The manufacturing cost can be significantly reduced. Also, Uni
By further reducing the cost of the Versal joint
Wear. To improve manufacturability of universal joints
You can

According to the invention of claim 6, claim 3
It is possible to obtain the effect of the invention described in any one of
Wear. According to the invention described in claim 7 , in addition to the effects of the invention described in claims 1 to 6 , the cost of the propeller shaft can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a propeller shaft according to the present invention.

FIG. 2 is a front view of a yoke that also constitutes a universal joint of a propeller shaft.

FIG. 3 is a cross-sectional view of essential parts of a connecting member and a joining member that also constitute the yoke of the universal joint.

FIG. 4 is a front view of a yoke of a universal joint used in a conventional propeller shaft.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Propeller shaft, 11 ... Cylindrical shaft as a FRP cylinder, 12 ... Universal joint, 14 ... Yoke, 14a ... Joining part, 14b ... Connecting part, 14d ... Joining member side joining part, 15 ... Joining member, 16 ... Connection member, 16b
... Coupling part on the connecting member side.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-361 (JP, A) JP-A-5-87117 (JP, A) JP-A-62-101911 (JP, A) Actual development Sho-64- 12951 (JP, U) Actually opened 61-515 (JP, U) Actually opened 62-75213 (JP, U) Actually opened 62-94926 (JP, U) Actually opened 62-94927 (JP, U) 62-188615 (JP, U) 62-17830 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16C 3/02 B60K 17/22

Claims (7)

(57) [Claims] 1. A universal joint for a propeller shaft having a yoke having a joint for internally fitting and joining to an end of a FRP cylinder and a joint for connecting a drive shaft of a drive source or a driven shaft of a driven part. in, the yoke, the joining member, respectively a junction, formed by joining and connecting member comprising a connecting portion at friction welding,
The connecting member is formed with a cylindrical connecting member-side connecting portion,
A joining member-side joining portion is formed on the joining member,
The outer diameter of the joint on the member side is set to the outside of the minimum outer shape of the joint on the member side.
Universal joint for propeller shafts characterized by being set smaller than the diameter . 2. The universal joint for a propeller shaft according to claim 1, wherein the joining member-side coupling portion is solid . 3. A joint for internally fitting and joining to an end of a FRP cylinder.
And the drive shaft of the drive source or the driven shaft of the driven part
In a universal joint of a propeller shaft having a yoke having a connecting portion, the yoke is connected to a connecting member to be a connecting portion.
Formed by connecting the connecting member that becomes the part with welding means,
The connecting member is formed with a cylindrical connecting member-side connecting portion,
A joining member-side joining portion is formed in the joining member, the outer diameter of the joining member-side joining portion is set to be smaller than the outer diameter of the minimum outer shape of the joining member-side joining portion, and the joining member-side joining portion has a cylindrical shape.
Is formed, and the outer diameter of the connecting member side connecting portion is connected to the connecting member side.
Set the diameter smaller than the outer diameter of the joint, and
The inner diameter of the joint is the same as the inner diameter of the joint on the joining member side or the joint
A universal joint for a propeller shaft characterized by being set larger than the inner diameter of the material side joint. 4. The universal joint for a propeller shaft according to claim 3, wherein a balance weight is provided on an outer peripheral surface of the coupling member side coupling portion.
A universal joint for propeller shafts, which is characterized as a place to attach . 5. A joint for internally fitting and joining to an end of a FRP cylinder.
And the drive shaft of the drive source or the driven shaft of the driven part
In a universal joint of a propeller shaft having a yoke having a connecting portion, the yoke is connected to a connecting member to be a connecting portion.
Formed by connecting the connecting member that becomes the part with welding means,
The connecting member is formed with a cylindrical connecting member-side connecting portion,
A joining member-side joining portion is formed on the joining member,
The outer diameter of the joint on the member side is set to the outside of the minimum outer shape of the joint on the member side.
A universal joint for a propeller shaft, characterized in that it is set smaller than the diameter, and the outer peripheral surface of the coupling member side coupling portion is used as a place for attaching a balance weight. 6. The flop according to any one of claims 3 to 5
In the universal joint of the loper shaft, the welding means for connecting the joining member and the connecting member is
Unibar of propeller shaft characterized by pressure welding
-Sal joint. 7. The user according to claim 1, wherein
Propeller shaft with a universal joint.