JP7254566B2 - Joint member manufacturing method and joint member used for constant velocity joint - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a method of manufacturing a joint member used in a constant velocity joint and the joint member.

Constant velocity joints, such as those used in propeller shafts, are configured to transmit torque between first and second shafts arranged in series.

A joint member for a constant velocity joint generally includes a cylindrical outer race that engages with the first shaft via an inner race and balls. Further, as a joint member for a constant velocity joint, there is known one having a sleeve integrally formed at one axial end of an outer race and engaged with a second shaft so as to be non-rotatable relative to the second shaft.

When manufacturing such a joint member, an intermediate formed body in which an outer race portion and a sleeve portion are integrally formed is hot forged from a metallic material. Then, track grooves are formed on the inner peripheral surface of the outer race portion by cutting or the like, and female splines are formed on the inner peripheral surface of the sleeve portion by drilling and broaching.

JP 2013-194862 A

By the way, as the above-mentioned joint member, it is conceivable that the sleeve is axially slidably engaged with the second shaft.

However, in such a joint member, the sleeve and the female spline are sometimes formed long in order to secure a sufficient sliding length and suppress sliding resistance. In this case, due to the limitation of forging formability, it is not possible to form the pilot hole of the female spline in the sleeve portion of the intermediate compact only by hot forging, and it is necessary to machine the pilot hole before broaching. be. Therefore, the manufacturing cost increases due to the increase in the number of processing man-hours.

Therefore, the present disclosure was created in view of such circumstances, and an object thereof is to provide a method for manufacturing a joint member and a joint member that can suppress manufacturing costs.

According to one aspect of the present disclosure, a tubular constant velocity joint that is used in a constant velocity joint that connects a first shaft and a second shaft in series and can be engaged with the first shaft via an inner race and rolling elements and a sleeve that can be axially slidably and non-rotatably engaged with the second shaft, the method comprising: an outer race manufacturing step of manufacturing the outer race; , a sleeve manufacturing step of manufacturing the sleeve separately from the outer race; and a joining step of joining one end portions of the outer race and the sleeve in the axial direction. A manufacturing method is provided.

Preferably, in the joining step, the axial end portions of the outer race and the sleeve are joined together by friction welding, laser welding, electron beam welding, or magnetic drive arc welding.

Further, the sleeve manufacturing process includes a hot forging step of hot forging a cylindrical intermediate formed body having a prepared hole in the inner peripheral portion from a sleeve material, and a broaching process of the intermediate formed body to form a female spline. and a female spline manufacturing step formed in the pilot hole.

Further, the sleeve manufacturing process includes a female spline forming process of broaching a pipe material as a sleeve material having a pilot hole in the inner circumference to form a female spline in the pilot hole.

Further, the outer race manufacturing process includes a cold forging process of forming track grooves of the outer race by cold forging.

Also, the constant velocity joint is used for a propeller shaft.

According to one aspect of the present disclosure, there is provided a joint member used in a constant velocity joint connecting a first shaft and a second shaft in series, the joint member being engaged with the first shaft via an inner race and rolling elements. a sleeve formed separately from the outer race and engageable with the second shaft in an axially slidable and non-rotatable manner; the outer race and the sleeve. and a joining portion that joins one axial ends of each of the joint members.

Preferably, the joint is formed by friction welding, laser welding, electron beam welding or magnetically driven arc welding.

A female spline is formed on the inner circumference of the sleeve.

Also, the sleeve is made of a pipe material on which the female spline is formed.

Also, the constant velocity joint is used for a propeller shaft.

Advantageous Effects of Invention According to the present disclosure, manufacturing costs can be suppressed in manufacturing joint members used in constant velocity joints.

1 is a schematic configuration diagram of a propeller shaft; FIG. 2 is a schematic cross-sectional view of the intermediate joint shown in FIG. 1; FIG. 4 is an exploded perspective view of an intermediate joint; FIG. FIG. 3 is an enlarged sectional view of the joint member shown in FIG. 2; It is an exploded perspective view of a joint member. FIG. 6 is a front view of the outer race shown in FIG. 5; Figure 6 is a rear view of the sleeve shown in Figure 5; It is process drawing which shows the manufacturing method of the joint member of an intermediate joint. 6 is a schematic cross-sectional view showing a method of manufacturing the outer race shown in FIG. 5; FIG. Figure 2 is a schematic cross-sectional view of the rear joint shown in Figure 1; Fig. 4 is an exploded perspective view of the outer race of the rear joint; 11 is an enlarged cross-sectional view of the flange mounting portion shown in FIG. 10; FIG. It is a sectional view showing a modification of a flange attaching part. FIG. 5 is a schematic cross-sectional view showing a method of manufacturing an outer race of the rear joint;

Embodiments of the present disclosure will be described below with reference to the accompanying drawings. It should be noted that each direction shown in the drawing is merely defined for convenience of explanation.

First, with reference to FIGS. 1 to 7, the structures of constant velocity joints and joint members according to the present embodiment will be described. Note that the front-rear direction in the present embodiment coincides with the axial direction of the joint member 10 extending in the front-rear direction of the vehicle (not shown).

As shown in FIG. 1, an intermediate joint 100 is used in a propeller shaft 1 of a vehicle.

The propeller shaft 1 includes a rear joint 200, a rear shaft 1a as a first shaft, an intermediate joint 100 as a constant velocity joint, a front shaft 1b as a second shaft, and a front joint 300, which are arranged in order from the rear. Prepare.

A rear joint 200 connects the rear shaft 1a in series with the input shaft 2 of the final gear. The final gear of this embodiment is used for a differential of an axle suspension (rigid axle), and moves up and down together with the axle of the rear wheel.

The front joint 300 connects the front shaft 1b in series with the output shaft 3 of the transmission.

In this embodiment, fixed constant velocity joints are used for the rear joint 200 and the front joint 300 . However, the front and rear joints 200, 300 may be of any type, for example double offset, tripod or rebro type sliding constant velocity joints. Also, at least one of the joints 200 and 300 may be a universal joint or the like.

The intermediate joint 100 connects the rear shaft 1a and the front shaft 1b in series. As a result, in the vehicle, the power of the power source such as the engine is transferred to the output shaft 3 of the transmission, the front joint 300, the front shaft 1b, the intermediate joint 100, the rear shaft 1a, the rear joint 200, and the input shaft of the final gear. 2 are transmitted in order. The front shaft 1b is rotatably supported by a center bearing B fixed to the vehicle body.

As shown in FIGS. 2 and 3, the intermediate joint 100 is a fixed constant velocity joint. The intermediate joint 100 includes a joint member 10 , an inner race 50 , balls 60 as rolling elements, and a cage 70 . In FIG. 2 , reference numeral 4 denotes a tubular boot fitting attached to the rear end portion of the joint member 10 , and reference numeral 5 denotes a boot fitted to the rear end portion of the boot fitting 4 . Reference numeral 6 denotes a disc-shaped plug that partitions the interior of the joint member 10 .

The inner race 50 has an annular shape and is spline-fitted to the front end of the rear shaft 1a. A plurality of inner track grooves 51 extending in the front-rear direction are formed on the outer peripheral surface of the inner race 50 in the circumferential direction (six at equal intervals in the illustrated example).

The cage 70 is formed in a cylindrical shape and has a plurality of (six in the illustrated example) openings 71 in the circumferential direction. A plurality of (six in the illustrated example) balls 60 are provided, are inserted through the openings 71 of the cage 70 , and are arranged in the inner track grooves 51 of the inner race 50 .

The joint member 10 includes an outer race 20 that can be engaged with the rear shaft 1a via an inner race 50 and balls 60, and a sleeve 30 that is formed separately from the outer race 20 and can be engaged with the front shaft 1b. And prepare. The joint member 10 also includes a joint portion 40 that joins the front end portion of the outer race 20 and the rear end portion of the sleeve 30 to each other.

As shown in FIGS. 3 to 5, the outer race 20 is tubular. The outer race 20 includes an outer race body 21 extending forward from the rear end and a reduced diameter portion extending forward continuously from the front end of the outer race body 21 and having an outer diameter smaller than that of the outer race body 21. 22 and.

The front end portion of the outer race main body 21 is formed so that the outer diameter and the inner diameter gradually decrease toward the front end.

In the inner peripheral surface 21a of the outer race main body 21, a plurality of outer track grooves 23 extending in the front-rear direction are formed in the circumferential direction (six at equal intervals in the illustrated example). Also, the outer track groove 23 has a substantially semicircular cross-sectional shape complementary to the inner track groove 51 of the inner race 50 (see FIG. 6). The center of the outer track groove 23 bulges radially outward more gently than both ends in the front-rear direction.

Returning to FIGS. 2 and 3 , the outer track groove 23 holds the ball 60 together with the inner track groove 51 of the inner race 50 . As a result, torque is transmitted from the outer race 20 to the inner race 50 via the balls 60 . Also, although not shown, the ball 60 rolls on the outer track groove 23 in the front-rear direction, so that the inner race 50 and the cage 70 together with the rear shaft 1a tilt with respect to the axial direction of the joint member 10 .

On the other hand, a boot attachment groove 24 for attaching the boot attachment 4 is formed in the outer peripheral surface 21b of the rear end portion of the outer race main body 21 . The boot mounting groove 24 is formed in an annular shape that extends in the circumferential direction and makes one turn, and is fitted with a protrusion 4 a formed on the inner peripheral surface of the front end portion of the boot mounting member 4 .

The reduced diameter portion 22 is positioned at the front end portion of the outer race 20 and formed in a cylindrical shape with a constant diameter. The inner peripheral surface of the diameter-reduced portion 22 is formed to have a slightly larger diameter than the front end portion 21 c of the outer race main body 21 . Thereby, the reduced diameter portion 22 is formed thinner and lighter than the outer race main body 21 .

As indicated by arrow A in FIG. 2, the sleeve 30 is formed to be axially slidable and non-rotatably engageable with the front shaft 1b. That is, a male spline X1 is formed on the outer circumference of the front shaft 1b, and a female spline X2 is formed on the inner circumference of the sleeve 30. As shown in FIG. The female spline X2 is axially slidably engaged with the male spline X1.

In addition, the sleeve 30 of this embodiment has an annular cross-sectional shape (see FIG. 7). The sleeve 30 also has a sleeve body 31 extending rearward from the front end and an enlarged diameter portion 32 extending rearward continuously from the rear end of the sleeve body 31 and having a larger diameter than the sleeve body 31 .

The sleeve body 31 is formed in a substantially cylindrical shape. In addition, the sleeve body 31 has an axial length L1 that allows sufficient sliding on the front shaft 1b. For example, the sleeve body 31 of the present embodiment is set to have an axial length three to four times that of the outer race body 21 .

The female spline X2 is formed on the inner peripheral surface 31a of the sleeve body 31. As shown in FIG. In addition, the female spline X2 has an axial length L2 that can sufficiently suppress the sliding resistance by reducing the contact pressure with the male spline X1. The female spline X2 of this embodiment is formed from the rear end position of the sleeve body 31 to a position near the front end.

As shown in FIGS. 4 and 5, the enlarged diameter portion 32 is located at the rear end of the sleeve 30 and is further defined by a rear portion 32a and a front portion 32b.

A rear portion 32 a of the enlarged diameter portion 32 is formed in a cylindrical shape having the same outer diameter and inner diameter as those of the reduced diameter portion 22 of the outer race 20 . As a result, the rear portion 32a of the enlarged diameter portion 32 is formed thin and light like the diameter reduced portion 22 of the outer race 20. As shown in FIG.

On the other hand, the front portion 32 b of the enlarged diameter portion 32 is formed in a cylindrical shape having the same outer diameter as the reduced diameter portion 22 and an inner diameter smaller than that of the reduced diameter portion 22 . A plug attachment portion 33 is formed on the inner peripheral surface of the front portion 32 b of the enlarged diameter portion 32 so as to be slightly enlarged in diameter from the inner diameter of the sleeve body 31 . The plug 6 (see FIG. 2) is press-fitted into the plug mounting portion 33 from behind. After that, the edge portion 33a of the plug mounting portion 33 is crimped radially inward by a pressing machine. Inside the joint member 10 partitioned by the plug 6, different types of grease can be used on the outer race 20 side and the sleeve 30 side.

The joint 40 is formed by friction welding in this embodiment. That is, the front end surface F1 of the reduced diameter portion 22 of the outer race 20 and the rear end surface F2 of the enlarged diameter portion 32 of the sleeve 30 are friction-welded while facing each other.

According to the structure of the joint member 10 described above, when the rear shaft 1a engaged with the outer race 20 tilts in the axial direction of the joint member 10 as shown in FIG. As a result, the sleeve 30 can move forward and backward with respect to the front shaft 1b.

On the other hand, although not shown, as the constant velocity joint that can move in the longitudinal direction with respect to the shaft, a double offset type, tripod type, or rebro type sliding constant velocity joint or the like is generally used. However, in these sliding constant velocity joints, when the inclination angle of the shaft is large, the shaft comes into contact with the boot fixture or the like, and the friction between the balls and the outer track grooves increases. Directional movement may be restricted.

In contrast, with the joint member 10 of the present embodiment, the rear shaft 1a can move in the front-rear direction with respect to the front shaft 1b regardless of the inclination angle of the rear shaft 1a. can be secured to

Next, a method for manufacturing the joint member 10 will be described with reference to FIGS. 4 to 9. FIG. 8A to 8D are process diagrams showing a method for manufacturing the joint member 10. FIG.

As shown in FIGS. 4 to 8, the method for manufacturing the joint member 10 includes an outer race manufacturing step S1 for manufacturing the outer race 20, a sleeve manufacturing step S2 for manufacturing the sleeve 30 as a separate body from the outer race 20, Prepare. Further, the method of manufacturing the joint member 10 includes a joining step of joining the front end portion of the outer race 20 and the rear end portion of the sleeve 30 to each other, and S3.

Although not shown, the outer race manufacturing step S1 includes an outer race material manufacturing step S1a in which a cylindrical outer race material is warm-forged from a metal material (for example, a cylindrical billet) that will later become the outer race 20. .

The outer race manufacturing step S1 also includes a cold forging step S1b of forming the outer track grooves 23 by cold forging the warm forged outer race material. However, if possible, the outer track grooves 23 may be cold forged directly from the material without the warm forging.

Further, in the outer race manufacturing step S1, the outer race material having the outer track grooves 23 formed thereon is cut, and the boot mounting grooves 24 are formed in the outer peripheral surface 21b of the rear end portion of the outer race body 21. A processing step S1c is included (see FIG. 9). However, the boot mounting groove 24 may be formed in the cold forging step S1b.

The sleeve manufacturing step S2 includes a sleeve material manufacturing step S2a in which a cylindrical sleeve material is formed by pierce-forming a metal material (for example, a cylindrical billet) that will later become the sleeve 30 .

The sleeve manufacturing step S2 also includes a hot forging step S2b for hot forging an intermediate formed body having a prepared hole for the female spline X2 in the inner peripheral portion from the pierce-formed sleeve material. The pilot hole referred to here corresponds to the inner peripheral surface 31a of the sleeve body 31 shown in FIG.

The sleeve manufacturing step S2 also includes a female spline working step S2c in which the hot-forged intermediate compact is broached to form a female spline X2 (spline groove) in the prepared hole.

In the joining step S3, the end surfaces of the reduced-diameter portion 22 of the outer race 20 and the enlarged-diameter portion 32 of the sleeve 30 are butted against each other and friction-welded.

Next, the effects of the method for manufacturing the joint member 10 according to this embodiment will be described.

In general, when a joint member having an outer race and a sleeve is manufactured, an intermediate molded body in which the outer race portion and the sleeve portion are integrally formed is hot-pressed from a pierce-molded hollow material. forge. Then, an outer track groove is formed on the inner peripheral surface of the outer race portion by machining such as cutting and grinding, and a female spline is formed on the inner peripheral surface of the sleeve portion by drilling (machining) and broaching. Form.

Here, when the sleeve 30 is axially slid on the front shaft 1b as in the present embodiment, it is necessary to ensure a sufficient sliding length. be. In addition, the female spline X2 may be formed long in order to reduce the contact pressure between the splines and suppress the sliding resistance.

In this case, if the sleeve is to be manufactured integrally with the outer race, it may be impossible to form pilot holes for the female splines in the sleeve portion of the intermediate molded body only by hot forging due to limitations in forging formability. Therefore, it is necessary to machine the pilot hole before broaching, which increases the manufacturing cost due to the increased number of machining steps.

In contrast, in the manufacturing method of the present embodiment, the outer race 20 and the sleeve 30 are manufactured separately and then joined together. Therefore, even if the sleeve 30 and the female spline X2 are formed long, it is possible to form the pilot hole of the female spline X2 by hot forging.

Therefore, according to this embodiment, in manufacturing the joint member 10 used for the intermediate joint 100, the machining of the pilot hole of the female spline X2 can be omitted, and the manufacturing cost can be suppressed.

In addition to the above, the manufacturing method of the present embodiment also has the following effects (1) to (3). In the following description, the same reference numerals are used for components that are the same as or correspond to those of the intermediate joint 100 of the present embodiment, and detailed description thereof will be omitted.

(1) For example, if the outer race and the sleeve are manufactured integrally, the outer track groove cannot be formed only by warm forging or cold forging due to the problem of forging formability. It is necessary to machine the outer race part of the body. Therefore, there is a problem that the number of processing man-hours increases and the yield of the material deteriorates. In particular, when the outer track groove 23 of this embodiment has a shape in which the center bulges radially outward more gently than both ends in the front-rear direction, machining becomes difficult.

In contrast, in the present embodiment, only the outer race 20 is manufactured separately from the sleeve 30 . Therefore, the outer track grooves 23 can be formed by cold forging, eliminating the need for machining. As a result, the number of processing steps can be reduced, and the yield of materials can be improved to suppress manufacturing costs.

(2) Since the outer race 20 is manufactured separately from the sleeve 30, the outer race can be shared with other types of constant velocity joints.

For example, in the rear joint 200 shown in FIG. 1, as shown in FIGS. 10 and 11 and as can be seen by comparison with FIG. A boot mounting groove 24 is formed in the .

Also, in the rear joint 200 , the flange 80 is joined to the rear end portion of the outer race main body 21 . The flange 80 is fastened to the flange portion 2a (see FIG. 1) formed at the front end portion of the input shaft 2 of the final gear using bolts and nuts.

The outer race 20 of the rear joint 200 has a flange attachment portion 25 formed by reducing the diameter of the outer peripheral surface of the rear end portion of the outer race main body 21 over the entire circumference.

As shown in FIG. 12 , the inner peripheral surface 80 a of the flange 80 is fitted to the outer peripheral surface 25 a of the flange mounting portion 25 . Also, the front end face 80b of the flange 80 and the front end face 25b of the flange mounting portion 25 are brought into contact with each other, and a welded portion W is formed by butt welding. However, as shown in FIG. 13, fillet welding may be used instead of butt welding. As a welding method, laser welding, electron beam welding, magnetically driven arc welding, or the like, which causes less distortion due to heat than ordinary arc welding, is used.

Further, the outer race 20 of the rear joint 200 has a seal plate mounting portion 26 formed by enlarging the inner peripheral surface of the rear end portion of the outer race main body 21 over the entire circumference. A disk-shaped seal plate 7 is fitted and attached to the seal plate attachment portion 26 .

As shown in FIG. 14, the boot mounting groove 24, the flange mounting portion 25, and the seal plate mounting portion 26 can be formed simply by machining the outer race material (see FIG. 9) in which the outer track groove 23 is formed. Easy to form. Also, the flange 80 can be easily joined by simply fitting it to the flange mounting portion 25 and welding it. Although not shown, the outer race of the front joint 300 can also be manufactured by a similar method.

Thus, in this embodiment, the intermediate joint 100 , the rear joint 200 and the front joint 300 can share the outer race 20 . As a result, the manufacturing cost of each joint can be suppressed.

(3) As shown in FIG. 2, the joint 40 of the present embodiment is formed by friction welding. In the case of friction welding, the amount of heat input to the joint 40 is smaller than that in normal arc welding, so distortion due to heat can be reduced. As a result, it is possible to improve the deflection accuracy when the propeller shaft 1 rotates.

(4) In the present embodiment, the sleeve 30 is manufactured separately from the outer race 20. Therefore, after the plug 6 is press-fitted into the plug mounting portion 33, the edge portion 33a of the plug mounting portion 33 is crimped with a press machine. construction method becomes easier.

Although the basic embodiment of the present disclosure has been described in detail above, the present disclosure can be modified as follows or a combination thereof.

(Modification 1)
Although not shown, the sleeve 30 may be made of a pipe material in which a pilot hole for the female spline X2 is formed.

In this case, the sleeve material manufacturing step S2a and the hot forging step S2b are omitted from the sleeve manufacturing step S2 shown in FIG. In the female spline processing step S2c, the originally existing pilot hole of the pipe material is broached to form the female spline X2.

(Modification 2)
In the joining step S3, laser welding, electron beam welding, or magnetic drive arc welding may be used instead of friction welding.

For example, in magnetic drive arc welding, a certain gap is provided between the end surfaces of the reduced diameter portion of the outer race and the enlarged diameter portion of the sleeve, and an arc is generated in the gap by a welding machine. Electromagnetic coils and permanent magnets are arranged on the outer circumferences of the diameter-reduced portion and the diameter-enlarged portion to generate a magnetic field, thereby rotating the arc in the circumferential direction at high speed. Then, the joint surfaces are pressure-welded in a state in which the joint is melted by arc heat.

Similar to friction welding, laser welding, electron beam welding, or magnetically driven arc welding applies less heat input to the joint compared to normal arc welding, so that thermal distortion can be reduced. However, normal arc welding may be used as long as the influence of distortion due to heat is within an allowable range. Moreover, not only butt welding but also fitting welding may be used.

In addition, in the joining step S3, in addition to friction welding, laser welding, electron beam welding, or magnetic drive arc welding, it is possible to use various joining methods such as shrink fitting, press fitting, or pinning after press fitting. be.

(Modification 3)
If possible, the sleeve material manufacturing step S2a may be omitted from the sleeve manufacturing step S2 shown in FIG. 8, and an intermediate compact having a pilot hole may be hot forged directly from the material (cylindrical billet).

The configurations of the respective embodiments described above can be partially or wholly combined as long as there is no contradiction. Embodiments of the present disclosure are not limited to the above-described embodiments, and include all modifications, applications, and equivalents encompassed by the concept of the present disclosure defined by the claims. Accordingly, the present disclosure should not be construed in a restrictive manner, and can be applied to any other technology that falls within the spirit of the present disclosure.

1 propeller shaft 1a rear shaft (first shaft)
1b front shaft (second shaft)
10 Joint member 20 Outer race 21 Outer race main body 22 Reduced diameter portion 23 Outer track groove 24 Boot mounting groove 30 Sleeve 31 Sleeve main body 31a Inner peripheral surface (prepared hole)
32 Expanded diameter portion 33 Plug attachment portion 40 Joint portion 50 Inner race 60 Ball 70 Cage 100 Intermediate joint (constant velocity joint)
X1 Male spline X2 Female spline

Claims (9)

A cylindrical outer race that is used in a constant velocity joint that connects a first shaft and a second shaft in series and is engageable with the first shaft via an inner race and rolling elements; A method for manufacturing a joint member, comprising: a sleeve that can be engaged in an axially slidable and non-rotatable manner,
an outer race manufacturing process for manufacturing the outer race;
a sleeve manufacturing step of manufacturing the sleeve separately from the outer race;
a joining step of joining one ends of the outer race and the sleeve in the axial direction ,
The outer race and the sleeve have a cylindrical shape that penetrates the entire length in the axial direction, the sleeve is formed with a female spline, and the sleeve is attached with a plug that partitions the interior thereof,
In the joining step, axial ends of the outer race and the sleeve are joined together by friction welding, laser welding, electron beam welding, or magnetic drive arc welding.
A method of manufacturing a joint member characterized by: The sleeve manufacturing process includes:
a hot forging step of hot forging a cylindrical intermediate formed body having a pilot hole in the inner peripheral portion from a sleeve material;
The method of manufacturing a joint member according to claim 1 , further comprising a female spline manufacturing step of broaching the intermediate molded body to form a female spline in the pilot hole. The sleeve manufacturing process includes:
2. The method of manufacturing a joint member according to claim 1 , further comprising a female spline forming step of broaching a pipe material as a sleeve material having a pilot hole in the inner circumference to form a female spline in the pilot hole. The method for manufacturing a joint member according to any one of claims 1 to 3 , wherein the outer race manufacturing step includes a cold forging step of forming track grooves of the outer race by cold forging. The method for manufacturing a joint member according to any one of claims 1 to 4 , wherein the constant velocity joint is used for a propeller shaft. A joint member used in a constant velocity joint that connects a first shaft and a second shaft in series,
a cylindrical outer race engageable with the first shaft via an inner race and rolling elements;
a sleeve formed separately from the outer race and capable of engaging the second shaft in an axially slidable and non-rotatable manner;
a joint portion that joins axial ends of the outer race and the sleeve ,
The outer race and the sleeve have a cylindrical shape that penetrates the entire length in the axial direction, the sleeve is formed with a female spline, and the sleeve is attached with a plug that partitions the interior thereof,
The joint is formed by friction welding, laser welding, electron beam welding or magnetically driven arc welding.
A joint member characterized by: The joint member according to claim 6 , wherein a female spline is formed on the inner periphery of the sleeve. The joint member according to claim 7 , wherein the sleeve is made of a pipe material having the female spline formed thereon. The joint member according to any one of claims 6 to 8 , wherein the constant velocity joint is used for a propeller shaft.

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