JP2000120649A - Joining method for frp tubular body with metal component and shaft component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high bonding strength between an FRP tubular body and metal component to be put in serration coupling by allowing the teeth of serration to bite on the metal component to bite deeply into the FRP tubular body. SOLUTION: The machining part 5a of a tool 5 is fitted by pressure to a cylindrical shaft 2 made of fiber-reinforced resin(FRP), and by teeth 6a, the internal surface of the shaft 2 is furnished previously with a guide groove for teeth 4a of normal serration 4. The tool 5 is drawn off from the cylindrical shaft 2. The joining part 3a of a yoke 3 is fitted by pressure to the cylindrical shaft 2 in such an arrangement that the teeth 4a of the serration 4 are positioned alongside the guide groove. Because of previous provision of guide groove, it is unlikely that the shaft 2 gets on the teeth 4a to cause diameteric enlargement when the joining part 3a of the yoke 3 is fitted in by pressure, and the teeth 4a carve deeply the internal surface of the shaft 2 and bite into it deeply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a fiber reinforced resin for a part of a shaft component such as a propeller shaft for a vehicle, so that a fiber reinforced resin cylinder and a metal component such as a yoke are serrated. And a shaft component.

[0002]

2. Description of the Related Art Conventionally, vehicle parts have been reduced in weight for the purpose of improving fuel efficiency of automobiles. For example, an attempt has been made to use a fiber reinforced resin (FRP) instead of metal for a part of a shaft such as a propeller shaft. In the case of a propeller shaft, set the shaft of the propeller shaft to FR
It is made of P and has a configuration in which metal parts (mounting fittings) such as a yoke of a universal joint are joined to both ends thereof. As the shaft portion made of FRP, a cylindrical shaft formed by a method such as a filament winding method is used. FRP cylindrical shafts and metal parts such as yokes are usually joined by serration bonding (for example, Japanese Patent Application Laid-Open No. H5-24455).

[0003] Serrations are formed in advance on the outer peripheral surface of the joint portion of the yoke, while no serrations are formed on the inner peripheral surface of the cylindrical shaft made of FRP. By inserting the joint of the yoke into the cylindrical shaft made of FRP, a groove is engraved on the inner peripheral surface of the cylindrical shaft by the serration teeth on the yoke side, and the teeth are deeply bitten into the groove to secure the joint strength. Is done.

[0004]

However, in the process of press-fitting the joint portion of the yoke to the cylindrical shaft, the cylindrical shaft made of FRP is easily pushed outward by the teeth of the serrations of the yoke, so that the diameter is easily expanded. For this reason, there is a case where a sufficiently deep groove is not formed by the teeth of the serrations on the yoke side, and the bite between the teeth of the serrations on the yoke side and the grooves of the serration on the cylindrical shaft side may be shallow. As a result, there is a problem that the bonding strength varies, for example, there is a case where the bonding strength between the cylindrical shaft and the yoke is insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a serration connection between an FRP cylinder and a metal part by connecting serration teeth on the metal part side to the FRP cylinder. It is an object of the present invention to provide a joining method between a FRP cylindrical body and a metal component and a shaft component, which can be deeply bitten into the joint and can enhance the joining strength between the two.

[0006]

According to the first aspect of the present invention, there is provided a joining method for serration-connecting an FRP cylinder and a metal part, the joining surface of the FRP cylinder being joined. A guide groove for guiding the serration teeth formed on the joint part peripheral surface of the metal component is formed in advance on a smaller size than the regular serration groove, and the serration teeth are formed in the guide groove. The gist of the invention is to press-fit the joint of the metal component into the FRP cylinder so as to conform to the above.

According to a second aspect of the present invention, in the joining method for serration-connecting an FRP cylinder and a metal part, a joining end of the FRP cylinder is joined to the metal part of the inner and outer peripheral surfaces thereof. The gist of the present invention is to back up from the peripheral surface on the side other than the surface and press-fit the joint of the metal component having serration teeth formed into the FRP cylinder in the backup state.

According to a third aspect of the present invention, in the joining method for serration-connecting an FRP cylinder and a metal part, serration teeth formed at a joint part of the metal parts are arranged at intervals in the longitudinal direction. And the remaining teeth other than the first press-fitted tooth of the set of teeth are formed at an angle at which the tooth surface of the press-fit side tip is steep,
The gist of the invention is to press-fit the joint of the metal component into the FRP cylinder.

According to a fourth aspect of the present invention, in the joining method for serration-connecting the FRP cylinder and the metal part, the angle at which the tooth surface of the press-fitting tip of the serration tooth formed at the joint part of the metal part is formed. The gist of the present invention is to press-fit the joint of the metal component into the FRP cylinder.

According to a fifth aspect of the present invention, the shaft component is manufactured by serration-connecting the metal component of the third aspect and the FRP cylinder. In the invention described in claim 6, the shaft component is manufactured by serration-coupling the metal component described in claim 4 and the FRP cylinder.

(Operation) According to the first aspect of the present invention,
A guide groove smaller than the regular serration groove size is formed in advance on the joint surface of the FRP cylindrical body. Then, the joint of the metal component is pressed into the FRP cylinder so that the serration teeth are aligned with the guide groove. Since the guide groove is cut in advance, FRP
A groove having a predetermined depth is formed in the inner peripheral surface of the cylindrical body, and the teeth are bitten.

According to the second aspect of the invention, the joint end of the FRP cylinder is backed up from the inner peripheral surface of the inner peripheral surface which is not the peripheral surface to be joined to the metal component. In this back-up state, the joint of the metal part having the serration teeth is pressed into the FRP cylinder. Since the deformation of the FRP cylindrical body escaping so as to increase in diameter is suppressed by the serration teeth, a groove having a predetermined depth is formed in the inner peripheral surface of the FRP cylindrical body by the serration teeth, and the teeth are strongly bitten.

According to the third aspect of the present invention, the serration teeth formed at the joint of the metal parts are sequentially pressed into the FRP cylinder. Even if the first press-fitted tooth of the group of teeth cannot cut the groove deeply into the inner peripheral surface of the FRP cylinder, the groove is deepened to a predetermined depth by the tooth surface at the angle at which the subsequent teeth are steep. Because it is carved, at least the following teeth bite hard.

According to the fourth aspect of the present invention, since the tooth surface of the serration tooth formed at the joint portion of the metal component has a steep angle at the tip end on the press-fit side, the joint portion of the metal component is formed into an FRP cylinder. In the process of press-fitting into the body, a groove of a predetermined depth is carved on the inner peripheral surface of the FRP cylinder by the teeth of the serrations, and the teeth bite hard.

According to the fifth aspect of the present invention, the shaft component is manufactured by serration-connecting the metal component and the FRP cylinder body according to the third aspect.
The joining strength with the cylindrical body is increased.

In the invention described in claim 6, the shaft component is manufactured by serration-connecting the metal component described in claim 4 and an FRP cylinder, so that the metal component is joined to the FRP cylinder. Strength increases.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention applied to the manufacture of a propeller shaft for a vehicle will be described below.
Will be described with reference to FIGS. The shaft portion of the propeller shaft in the present embodiment is formed of fiber reinforced resin (FRP).

As shown in FIG. 4, the propeller shaft 1
Has a cylindrical shaft 2 made of fiber reinforced resin (FRP), and a yoke 3 of a metal universal joint joined to both ends thereof. The cylindrical shaft 2 and the yoke 3 are serrated by the joint 3a of the yoke 3 being pressed into the cylindrical shaft 2. The cylindrical shaft 2 is an FRP cylinder, and the yoke 3 is a metal part.

The cylindrical shaft 2 is formed of a cylinder having a substantially constant thickness (however, a thick portion reinforced with a tightening thread at both ends) is formed by, for example, a filament winding method. That is, the resin-impregnated fiber is wound around a mandrel (core material) to form a cylindrical body, the resin impregnated into the fiber is thermally cured, and then the mandrel is pulled out to produce the cylindrical shaft 2. The winding direction of the fibers on the cylindrical shaft 2 is changed by a predetermined angle ± A ° with respect to the axial direction, and the winding is changed every layer. In the case of the propeller shaft 1, this angle A is set in the range of A = 5 to 20 °, and the torsional rigidity and the bending rigidity of the propeller shaft 1 are secured by winding the fibers substantially in the direction along the axial direction. .

FRP, which is the material of the cylindrical shaft 2, uses carbon fibers as the reinforcing fibers and epoxy resin as the matrix resin. In addition, as the reinforcing fibers, other fibers such as aramid fibers and glass fibers, which are generally referred to as having high elasticity and high strength, may be employed.As the matrix resin, other thermosetting materials such as unsaturated polyester resin, phenol resin, and polyimide resin may be used. Resin can be employed.

As shown in FIG. 1 (b), the joint 3a of the yoke 3 which is pressed into the cylindrical shaft 2 has
A serration 4 having a number of teeth 4a extending parallel to the axial direction is formed. As shown in FIG. 2B, the teeth 4a of the serration 4 are formed at a constant pitch in the circumferential direction, and have a trapezoidal cross-sectional shape.

In this embodiment, before press-fitting the joint 3a of the yoke 3 into the cylindrical shaft 2, a guide groove 2a for guiding the teeth 4a of the serrations 4 of the yoke 3 into the inner peripheral surface of the end of the cylindrical shaft 2 in advance. To form A tool 5 shown in FIG. 1A is used to cut the guide groove 2a. Tool 5 is yoke 3
And a processing portion 5a having the same diameter as the joining portion 3a of the yoke 3, and the teeth 4 of the serrations 4 of the yoke 3 are provided on the entire outer peripheral surface of the processing portion 5a.
Serration 6 having many teeth 6a of the same pitch as a
Are formed.

The cross-sectional shape of the teeth 4a of the serrations 4 of the yoke 3 is trapezoidal as shown in FIG. 2B, whereas the cross-sectional shape of the teeth 6a of the serrations 6 of the tool 5 is as shown in FIG. It is Yamagata. The outer diameter of the teeth 6a of the tool 5 and the yoke 3
In this embodiment, the outer diameters of the teeth 4a are equal to each other as R as shown in FIG. In addition, the joint 3a of the yoke 3
And a guide surface (taper surface) 3b for guiding press-fitting to the cylindrical shaft 2 at each press-fit side end portion in the processing portion 5a of the tool 5.
5b (shown in FIG. 1) are respectively formed.

Hereinafter, a method for joining the cylindrical shaft 2 made of FRP and the yoke 3 will be described with reference to FIGS. First,
Using the tool 5, the processing part 5a of the tool 5 is attached to the end of the cylindrical shaft 2.
Press-fit. As a result, as shown in FIG.
A mountain-shaped guide groove 2a as shown in FIG. At this time, since the teeth 6a of the tool 5 are angled and sharp, when the tool 5 is press-fitted into the cylindrical shaft 2, the escape of the cylindrical shaft 2 expanding in diameter is suppressed to a small value. For this reason, a guide groove 2a having a required depth (inner diameter R) is formed. The tool 5 is withdrawn from the cylindrical shaft 2.

Next, the joint 3a of the yoke 3 is pressed into the end of the cylindrical shaft 2. At this time, the yoke 3 is positioned in the rotational direction, and the teeth 4a of the serrations 4 are aligned with the guide grooves 2a. For example, if the cylindrical shaft 2 is fixed and the tool 5 and the yoke 3 are press-fitted using a press-fitting machine, the guide grooves 2a and the serrations 4 are adjusted by aligning the setting positions of the tool 5 and the yoke 3 with respect to the press-fitting machine. Can be positioned with high accuracy.

Since the teeth 4a of the regular serrations 4 are trapezoidal and the tops thereof are flat, the flat surfaces of the teeth 4a can easily work to spread the inner peripheral surface of the cylindrical shaft 2.
In particular, if there are many shaving allowances in which the teeth 4a form a groove on the inner peripheral surface of the cylindrical shaft 2, the cylindrical shaft 2 receives a large resistance and escapes to the outer peripheral side, so that the diameter is easily increased. However, since the guide groove 2a is cut in advance, the cutting allowance is small and the resistance is small. Therefore, when the joint 3a of the yoke 3 is pressed into the cylindrical shaft 2, the cylindrical shaft 2
3 is not spread too much, and the teeth 4a of the serrations 4 of the yoke 3 are used to move
A trapezoidal groove 2b as shown in FIG.
Therefore, the teeth 4a of the serrations 4 of the yoke 3 bite into the trapezoidal groove 2b, and the cylindrical shaft 2 and the yoke 3 are joined with high strength. Two yokes 3 are joined to both ends of the cylindrical shaft 2 by this joining method, and the propeller shaft 1 is manufactured.

As described in detail above, according to the present embodiment,
The following effects can be obtained. (1) The guide groove 2a is cut in advance on the inner peripheral surface of the end portion of the cylindrical shaft 2 made of FRP using the tool 5, and the yoke 3 is attached to the cylindrical shaft 2 so that the teeth 4a of the serrations 4 follow the guide groove 2a. 2 was adopted. For this reason, when the yoke 3 is press-fitted into the cylindrical shaft 2, the escape of the cylindrical shaft 2 being expanded and expanded in diameter can be reduced, and the teeth 4 a of the serrations 4 can bite into the inner peripheral surface of the cylindrical shaft 2. it can. Therefore, high joining strength between the cylindrical shaft 2 and the yoke 3 is secured.

(2) Since the cross-sectional shape of the teeth 6a of the tool 5 is angled, the guide grooves 2a can be formed firmly to a required depth. Since the guide groove 2a is deeply engraved, the trapezoidal groove 2b can be engraved to the required depth firmly by the teeth 4a of the serrations 4 when the yoke 3 is press-fitted. The bite of the yoke 3 and the teeth 4a into the inner peripheral surface of the cylindrical shaft 2 can be deepened. Further, since the meshing strength between the trapezoidal teeth 4a and the trapezoidal grooves 2b is high, when excessive rotational force is applied to the propeller shaft 1, the teeth 4a are
Can be prevented from slipping on the inner peripheral surface in the rotation direction.

(Second Embodiment) Next, a second embodiment in which the present invention is embodied in the manufacture of a propeller shaft for a vehicle will be described with reference to FIGS. The FRP cylindrical shaft 2 and the metal yoke 3, which are the components of the propeller shaft 1, are the same as those in the first embodiment. In this embodiment, the tool 5 used in the first embodiment is not used, and the yoke 3 is simply pressed into the cylindrical shaft 2 directly. The same parts and the like as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.

In this embodiment, as shown in FIG. 5, a support device 10 is used which can back up the joined end of the cylindrical shaft 2 from the outer peripheral side so as not to expand its diameter. Supporting device 10
Is provided with a set of semi-cylindrical fixed mold 11 and movable mold 12 having an inner peripheral surface having the same diameter as the outer diameter of the cylindrical shaft 2. Supporting device 10
5 is driven into an open state in which the movable mold 12 is separated from the fixed mold 11 as shown in FIG. 5 and a closed state in which the movable mold 12 and the fixed mold 11 are joined to form a cylinder. The cylinder formed by joining the fixed mold 11 and the movable mold 12 when the support device 10 is in the closed state has an inner diameter substantially equal to the outer diameter of the end of the cylindrical shaft 2. For this reason, as shown in FIG.
When the movable die 12 is driven to the closed position while being placed on the top 1, the end of the cylindrical shaft 2 is backed up by the inner peripheral surface of the fixed die 11 and the movable die 12 from the outer peripheral surface side so as not to expand the diameter. You. The support device 10 is, for example, a hydraulic drive type.

When the joint 3a of the yoke 3 is press-fitted into the cylindrical shaft 2, the joint end of the cylindrical shaft 2 is set on the fixed die 11 of the supporting device 10 as shown in FIG. I do. Then, the support device 10 is driven from the open state to the closed state. As a result, the movable mold 12 and the fixed mold 11 are joined to each other, and the joined end of the cylindrical shaft 2 is backed up by the cylinder formed by these parts so as not to expand from the outer peripheral surface as shown in FIG. (Step (1) in FIG. 5).

Next, the joint 3a of the yoke 3 is press-fitted into the backed-up cylindrical shaft 2 (step (2) in FIG. 5). Teeth 4 of serrations 4 of yoke 3
Although a force is applied to push the cylindrical shaft 2 from the inner peripheral surface by a, the joint end of the cylindrical shaft 2 is backed up by the fixed mold 11 and the movable mold 12 from the outer peripheral surface side. Will not escape to the outer peripheral side. As a result, the trapezoidal groove 2b is firmly formed on the inner peripheral surface of the cylindrical shaft 2 by the teeth 4a of the serrations 4. Thus, the teeth 4a of the serrations 4 bite deeply into the trapezoidal grooves 2b formed on the inner peripheral surface of the cylindrical shaft 2, and the cylindrical shaft 2 and the yoke 3 are joined with high strength.

According to this embodiment, the following effects can be obtained. (3) A method is adopted in which the joint 3a of the yoke 3 is press-fitted into the cylindrical shaft 2 while the joint end of the cylindrical shaft 2 is backed up from the outer peripheral surface side. Therefore, when the yoke 3 is press-fitted into the cylindrical shaft 2, the escape of the cylindrical shaft 2 expanding to the outer peripheral side is suppressed, so that the teeth 4 a of the serration 4 and the trapezoidal groove 2 a on the inner peripheral surface of the cylindrical shaft 2 are deepened. You can bite it. Therefore, high joining strength between the cylindrical shaft 2 and the yoke 3 can be secured.

(Third Embodiment) Next, a third embodiment in which the present invention is embodied in the manufacture of a propeller shaft for a vehicle will be described with reference to FIGS. The cylindrical shaft 2 made of FRP is the same as in each of the above embodiments. This embodiment is characterized by the shape of serration teeth formed on the yoke 3. The same parts and the like as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.

As shown in FIG. 7, the joint 3a of the yoke 3
The serration 7 is formed in the axial direction by being divided into three regions on the outer peripheral surface of. In other words, serration 7
Indicates a plurality of locations (for example, two locations in the present embodiment) in the longitudinal direction with respect to the serrations 4 of the above embodiments.
A toothless cutout 3c is inserted into the groove, and a toothed portion and a toothless portion are formed alternately in the longitudinal direction.

As shown in FIG. 8, the joint 3a of the yoke 3
Types of teeth 7a, 7 arranged in the axial direction on the outer peripheral surface of
The b and 7c are located such that the two adjacent teeth 7b and 7c are adjacent to each other with a predetermined distance from the tooth 7a located at the tip of the press-fit side. Tooth 7
The tooth surface on the press-fitting tip side of a is formed as a tapered surface for the guide surface 3b. On the other hand, the remaining two teeth 7b, 7c
The tooth surface 7d on the tip side of the press-fitting is formed at an angle that is steep at a right angle.

Therefore, the joint 3a of the yoke 3 is attached to the cylindrical shaft 2.
When press-fitting, the joint 3a is first press-fitted while being centered with respect to the cylindrical shaft 2 by the guide surface 3b at the front end of the press-fitting side. This press-fitting is performed along the guide surface 3b, and the cylindrical shaft 2 is formed by the tapered surface of the leading (first) tooth 7a.
It is easy to get on the outer peripheral surface (top) of a, and as a result, the diameter of the cylindrical shaft 2 may increase so as to escape to the outer peripheral side. In this case, a groove having a required depth is not formed on the inner peripheral surface of the cylindrical shaft 2 by the teeth 7a, and the depth of the groove may vary.

However, the expanded diameter of the cylindrical shaft 2 returns to the normal diameter once at the subsequent cut portion 3c. Next, the rear row (second row) of teeth 7b whose tooth surfaces 7d are vertically raised are press-fitted into the trapezoidal grooves 2b (see FIG. 3B) on the inner peripheral surface of the cylindrical shaft 2 by the teeth 7b. ) Is engraved firmly. Further, when the rear row (third row) of teeth 7c is press-fitted, the teeth 7c are press-fitted after the cylindrical shaft 2 returns to the normal diameter at the cut portion 3c. A trapezoidal groove 2b is firmly engraved on the inner peripheral surface of the cylindrical shaft 2. As described above, the notched portion 3c and the tooth groups 7b and 7c alternately appear after the tooth 7a in the process of press-fitting, so that the engraving by the teeth 7b and 7c is sequentially repeated each time the diameter of the cylindrical shaft 2 returns. It is. Therefore, even if the leading teeth 7a bit into the inner peripheral surface of the cylindrical shaft 2 shallowly, the following teeth 7a
Since b and 7c bite deep into the inner peripheral surface of the cylindrical shaft 2, the cylindrical shaft 2 and the yoke 3 are joined with high strength.

According to this embodiment, the following effects can be obtained. (4) Teeth 7a, 7b, 7c of serration 7 of yoke 3
Are formed intermittently in the longitudinal direction, and the teeth 7b and 7c whose tooth surfaces 7d are cut at a right angle are arranged after the leading tooth 7a whose tooth surfaces are tapered for the guide surface 3b. Therefore, when the yoke 3 is press-fitted, the cylindrical shaft 2 is temporarily guided by the guide surface 3b and rides on the teeth 7a to expand the diameter.
, The subsequent teeth 7b and 7c can be deeply bitten into the inner peripheral surface of the cylindrical shaft 2. Therefore, the cylindrical shaft 2 and the yoke 3 can be joined with high strength.

(Fourth Embodiment) Next, a fourth embodiment in which the present invention is embodied in the manufacture of a propeller shaft for a vehicle will be described with reference to FIGS. The cylindrical shaft 2 made of FRP is the same as in each of the above embodiments. This embodiment is characterized by the shape of the tip of the joint 3a of the yoke 3. The same parts and the like as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.

As shown in FIGS. 10 and 11, serrations 4 are formed on the outer peripheral surface of the joint 3a of the yoke 3. The teeth 4a of the serrations 4 have a trapezoidal cross-sectional shape as shown in FIG. 2B as in the first embodiment. However, it differs from the first embodiment in that the tooth surface 4b at the tip of the press-fit side of the tooth 4a is steeped at a right angle (vertically). For this reason, the guide surface 3b formed in the first embodiment is not formed at the distal end of the joint 3a,
By keeping the position of the tooth surface 4b of the tooth 4a a predetermined distance from the distal end surface of the joint 3a, a cylindrical guide portion 8 projecting toward the distal end side from the tooth surface 4b of the tooth 4a is formed at the distal end of the joint 3a. are doing. As shown in FIG.
1 is formed to be substantially equal to the inner diameter of the end of the cylindrical shaft 2 so that the joint 3a of the yoke 3 can be centered when the cylinder 3 is press-fitted into the inside of the cylindrical shaft.

Therefore, the joint 3a of the yoke 3 is attached to the cylindrical shaft 2.
, The joint 3a of the yoke 3 is first centered with respect to the cylindrical shaft 2 by the guide portion 8. When the joint 3a of the yoke 3 is pressed into the cylindrical shaft 2 in the centered state, the trapezoidal groove 2b (see FIG. 3 (b)) is formed by the teeth 4a having the tooth surfaces 4d of the serrations 4 rising at right angles. Engraved firmly. That is, since there is no guide surface 3b,
When the joint 3a is press-fitted, the phenomenon that the cylindrical shaft 2 rides on the teeth 4a and expands its diameter is unlikely to occur, and the tooth surface 4b is steep at a right angle. Engraved firmly. As a result, the teeth 4a of the serrations 4 of the yoke 3 bite deeply into the inner peripheral surface of the cylindrical shaft 2, and the cylindrical shaft 2 and the yoke 3 are joined with high strength.

According to this embodiment, the following effects can be obtained. (5) Since the tooth surfaces 4b of the teeth 4a of the serrations 4 of the yoke 3 are formed so as to be steep at right angles, grooves are firmly formed on the inner peripheral surface of the cylindrical shaft 2 by the teeth 4a, and the teeth 4a are formed on the cylindrical shaft 2. It can bite deep into the inner peripheral surface. Therefore,
High joining strength between the cylindrical shaft 2 and the yoke 3 can be secured. Further, since the guide portion 8 is formed at the joint 3a of the yoke 3, the centering of the yoke 3 with respect to the cylindrical shaft 2 can be performed with high accuracy at the time of press-fitting.

The embodiment is not limited to the above, and can be implemented in the following modes. In the third embodiment, the guide portion 8 as in the fourth embodiment is formed at the distal end of the joining portion 3a, and the distal end surface of the tooth 7a located at the press-in side distal end is also a tooth surface that is vertically cut. You can also. According to this configuration, all of the teeth 7a to 7c can be made to bite into the inner peripheral surface of the cylindrical shaft 2.

In the third or fourth embodiment, the angle of the tooth surface to be steeped is not limited to a right angle (90 °). It is sufficient that the teeth can firmly engrave the inner peripheral surface of the cylindrical shaft so that the cylindrical shaft does not ride on the teeth of the serrations like the guide surface 3b. For example, the outer peripheral surface and the tooth surface of the joint 3a are sufficient. The angle may be in the range of 45 ° to 110 °. When the angle is 45 ° or more and less than 90 °, the tip of the tooth becomes an acute angle, so that a groove is easily formed.

In the fourth embodiment, the guide portion 8
May be eliminated. ○ The part shape is not limited to a cylinder. It may be a polygonal cylinder such as a triangular cylinder or a square cylinder.

The matrix resin of the FRP is not limited to a thermosetting resin. For example, an ultraviolet curable resin or a thermoplastic resin can be used as the matrix resin. Even when these resins are used, the core can be dissolved or swollen by a specific solvent and removed, so that the heating device required for removing the core of the low melting point alloy described in the prior art is unnecessary. is there. Further, when a thermoplastic resin is used as the matrix resin, heating is not required for core removal, so there is no need to worry about thermal deformation of the cylindrical component.

The method for manufacturing the FRP cylinder is not limited to the filament winding method. For example, a sheet winding method can be adopted. When the shaft is used as a part, FR
The manufacturing method is not particularly limited as long as the P-made cylinder can be manufactured.

In the above embodiment, the joining part of the metal parts is cylindrical, but the joining part is not limited to a cylindrical one. For example, the joining part of the metal parts may be a solid cylindrical shape.

A structure in which the joining part is cylindrical like the metal part used in each of the above embodiments, and the FRP cylindrical body is pressed into the metal part, contrary to the joining relationship in each of the above embodiments. May be taken. Even with such a bonding structure, high bonding strength can be obtained by employing the bonding method of each of the above embodiments.

A reinforcing member made of a ring or the like may be assembled at the joint where the FRP cylinder and the metal component are serrated and a measure may be taken to further increase the joint strength. ○ Shaft parts are not limited to propeller shafts. The joining method of each of the above embodiments can be adopted for other drive transmission shafts. Further, the shaft component is not limited to the drive transmission shaft, and the joining method of each of the above embodiments may be employed for joining other components manufactured by serration-connecting the FRP cylinder and the metal component. Good.

The technical ideas other than the claimed invention grasped from the embodiment will be described below together with their effects. (1) In any one of claims 1 to 4, the metal component has a cylindrical shape at least at a joint portion, and the metal component is F
Instead of press-fitting the RP cylinder, press the FRP cylinder into the metal part. This configuration can also increase the strength due to serration coupling.

(2) The serration groove according to any one of claims 1 to 4, which is formed on the peripheral surface of the FRP cylindrical body serrated and connected to the joint of the metal component. When press-fitting the joint part of components to a FRP cylinder, it is engraved by serration teeth of the metal component. According to this configuration, the serration teeth of the metal part bite into the FRP cylinder.

(3) In the fourth aspect, a centering portion is formed at a front end of the joining portion of the metal component on the press-fitting side. According to this configuration, when the metal component is press-fitted into the FRP cylinder, the press-fit position of the metal component is centered by the centering portion.

(4) In claim 3, the tooth surface of the tip of the first group of teeth to be press-fitted on the press-fit side is the FRP.
It is formed on a guide surface for guiding press-fitting into the cylindrical body. According to this configuration, the metal component is press-fitted and guided into the FRP cylinder by the guide surface of the tooth that is press-fitted first.
Even if the FRP cylindrical body rides on the serration teeth and expands in diameter along the guide surface, even if the groove is not deeply engraved by the first tooth, the subsequent teeth are deep on the inner peripheral surface of the FRP cylindrical body. Since the grooves are engraved and bite deeply, high bonding strength is secured.

(5) In claim 5 or 6, the shaft component is a drive transmission shaft. According to this configuration, even when a severe stress (for example, torsional stress) is applied when the drive transmission shaft is rotationally driven, the FRP cylinder and the metal component have a high joining strength, so that the FRP cylinder and Bonding with metal parts is firmly maintained. Note that a drive transmission shaft is configured by the propeller shaft 1.

[0057]

As described in detail above, according to the first aspect of the present invention, after a guide groove having a size smaller than a regular serration groove is formed in advance on the joint peripheral surface of the FRP cylinder, A method was employed in which the metal component was pressed into the FRP cylinder so that the teeth of the regular serration of the metal component were aligned with the guide groove. Therefore, the teeth of regular serrations can be bitten into the inner peripheral surface of the FRP cylinder, and a high bonding strength between the FRP cylinder and the metal component can be obtained.

According to the second aspect of the present invention, the joining end of the FRP cylinder is backed up from the inner peripheral surface of the inner peripheral surface which is not the peripheral surface to be joined to the metal component. A method was employed in which the joint of the parts was press-fitted into an FRP cylinder. Therefore, the serration teeth of the metal component can be strongly bitten into the inner peripheral surface of the FRP cylinder, and a high joining strength between the FRP cylinder and the metal component can be obtained.

According to the third aspect of the invention, the teeth of the serration of the metal part are constituted by teeth arranged at intervals in the longitudinal direction, and the teeth other than the teeth which are first pressed in the teeth are removed. Since the tooth surface of the first tooth is set at an acute angle, at least the following tooth can be bitten into the inner peripheral surface of the FRP cylinder. Therefore, high joining strength between the FRP tubular body and the metal component can be obtained.

According to the fourth aspect of the present invention, since the tooth surface of the press-fitting end of the tooth of the serration of the metal part is at an acute angle, the tooth is strongly bite into the inner peripheral surface of the FRP cylinder. And a high joining strength between the FRP cylinder and the metal component can be obtained.

According to the fifth and sixth aspects of the present invention, it is possible to provide a shaft component in which the FRP cylindrical body and the metal component are serrated and connected with high bonding strength.

[Brief description of the drawings]

FIG. 1A is a partially cutaway side view showing a cylindrical shaft and a tool in the first embodiment, and FIG. 1B is a partially cutaway side view showing a cylindrical shaft and a yoke.

2A is a partial sectional view of the tool taken along the line II-II in FIG. 1A, and FIG. 2B is a partial sectional view of the yoke taken along the line III-III in FIG. 1B.

FIG. 3 is a partial front sectional view of a cylindrical shaft.

FIG. 4 is a partially cutaway side view of the propeller shaft.

FIG. 5 is a partially cutaway side view showing a joining step between a cylindrical shaft and a yoke in the second embodiment.

FIG. 6 is a front sectional view of a cylindrical shaft backed up by a support device.

FIG. 7 is a partially cutaway side view showing a cylindrical shaft and a yoke according to a third embodiment.

FIG. 8 is a partial side sectional view of a joint of the yoke.

FIG. 9 is a partial front sectional view of a joining portion of a yoke, and (a).
8 is a cross-sectional view of the tooth taken along line IV-IV in FIG. 8, and FIG.
FIG. 5 is a cross-sectional view of a cut portion along line VV.

FIG. 10 is a partially cutaway side view showing a cylindrical shaft and a yoke according to a fourth embodiment.

FIG. 11 is a partial side sectional view of a joint of a yoke.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Propeller shaft as a shaft part, 2 ... Cylindrical shaft as a FRP cylinder, 2a ... Guide groove, 2b ... Trapezoidal groove as a regular groove, 3 ... Yoke as a metal part, 3a ... Joint part, 3b ... Guide surface, 3c: notched portion, 4, 7: serration, 4a, 7a to 7c: tooth, 4b, 7d: tooth surface, 5: tool.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasumi Miyashita 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Minoru Toeda 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. F-term in Toyota Industries Corporation (reference) 3J033 AA01 AB02 AC01 BA07 BA20

Claims (6)

[Claims] 1. A joining method for serration-connecting an FRP cylinder and a metal part, wherein serration teeth formed on the joining part peripheral surface of the metal part are guided on a joint peripheral surface of the FRP cylinder. A guide groove for forming the serration is formed in advance with a smaller size than a regular serration groove, and a joint portion of the metal component is pressed into the FRP cylinder so that the serration teeth are aligned with the guide groove. A method for joining an FRP cylinder to a metal part. 2. A joining method for serration-connecting an FRP cylinder and a metal component, wherein a joining end of the FRP cylinder is formed from an inner and outer peripheral surface of a non-peripheral surface to be joined to the metal component. A method of joining an FRP cylinder and a metal component by backing up and press-fitting a joint portion of the metal component having serration teeth formed into the FRP cylinder in the backup state. 3. A joining method for serration-coupling an FRP cylinder and a metal component, wherein serration teeth formed at a joining portion of the metal component are formed in a tooth group arranged at intervals in the longitudinal direction. An FRP for press-fitting the joints of the metal parts into the FRP cylinder body by forming the tooth surfaces of the press-fitting-side tips of the remaining teeth other than the first press-fitted teeth at an acute angle.
A method of joining a cylindrical body and metal parts. 4. A joining method for serration-connecting a cylindrical body made of FRP and a metal part, wherein the tooth surface of the press-fitting-side tip of the serration tooth formed at the joint part of the metal part is set to an angle so as to be sharp. A method of joining an FRP cylinder and a metal component by press-fitting a part into the FRP cylinder. 5. The metal part according to claim 3 and the F
A shaft component manufactured by serration coupling with an RP cylinder. 6. The metal part according to claim 4, wherein
A shaft component manufactured by serration coupling with an RP cylinder.