JP2011106569A - Power transmission member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission member highly accurate and excelling in torque transmission performance, while being manufacturable at low cost. <P>SOLUTION: An intermediate shaft 1 works as the power transmission member A having a hollow part Is extending along the axis O. The hollow part Is is formed by welding a stub member 3 as a second shaft member A2 to one end of a pipe member 2 as a first shaft member A1 forming the hollow and a stub member 4 as a third shaft member A3 to the other end of the pipe member 2, respectively. The pipe member 2 and the stub members 3, 4 are welded with the ends butting against each other, respectively. The butting face 3a of the stub member 3 against the pipe member 2 and the butting face 4a of the stub member 4 against the pope member 2 are formed in protruded tapered faces 7, respectively, and the butted faces 2a, 2a of the pipe member 2 against the stub members 3, 4 are formed in recessed tapered faces 8 fittable to the protruded tapered faces 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power transmission member incorporated in a power transmission device of an automobile or various industrial machines, and more particularly to a power transmission member having a hollow portion.

  For example, there are a drive shaft and a propeller shaft configured by connecting two constant velocity universal joints with a shaft (intermediate shaft) as a power transmission device of an automobile. Intermediate shafts as power transmission members incorporated in these drive shafts and propeller shafts are roughly divided into solid types obtained by processing solid bar materials and hollow types having hollow portions extending along the axis. The However, recently, the hollow type tends to be frequently used to meet the demand for weight reduction of the underbody parts and the improvement of NVH characteristics.

  As a hollow type shaft, for example, as described in Patent Document 1 shown below, a torque transmission connecting portion (spline or serration) is connected to one end and the other end of a hollow first shaft member (pipe). There is a structure in which the second and third shaft members (stubs) formed with are respectively friction-welded. When the members are friction-welded, burrs are formed at the inner and outer diameter ends of the joint, but if the burrs formed at the outer diameter of the joint are left unattended, an annular member such as an elastic damper is provided on the outer periphery of the pipe. It becomes a hindrance when wearing. Therefore, burr formed at the outer diameter end of the joint is usually removed to some extent or completely by performing a turning process or the like. However, the burrs formed along with the friction welding are hardened by the frictional heat at the time of pressure welding and have a high hardness, so that there is a problem that a great deal of labor is required for removal processing. In addition, the burr formed at the inner diameter end of the joint has a problem that the ultrasonic flaw detection method cannot be applied when inspecting the joint state of the joint.

  Therefore, an attempt has been made to weld (melt welding) two adjacent shaft members in a state where the end portions are butted. If two adjacent shaft members are welded in this way, formation of burrs in the joining process can be avoided. For this reason, post-processing such as deburring is basically unnecessary, and the manufacturing cost can be reduced. Also, ultrasonic inspection can be applied to the inspection of the bonding state of the bonded portion, so that the quality can be reduced. The level of assurance is improved.

Japanese Patent Laid-Open No. 10-267027 JP 2009-103210 A

  By the way, as described above, when forming a power transmission member by welding two adjacent shaft members in a butted state, the shape of the joint end portion of each shaft member and between the shaft members at the time of welding Consideration of positioning (centering) method. For example, if the joint end (butting surface) of each shaft member is formed on a flat surface in a direction perpendicular to the axis, the joint end can be easily processed, but the centering between the shaft members can be performed with high accuracy. There is a problem that it is difficult to do. In addition, as described in Patent Document 2, for example, it is conceivable that the joint end portions of the shaft members are formed in an inlay shape that fits each other. In this case, centering between the shaft members can be performed with high accuracy, but there is a problem that a great deal of labor and cost are required for processing of the joining end as the shape of the joining end becomes complicated.

  Therefore, when manufacturing a power transmission member in which a hollow portion is formed by joining a plurality of shaft members, the present invention can relatively easily process the joining end portions of the shaft members and An object of the present invention is to provide a highly accurate power transmission member that can be positioned easily and with high accuracy, and can be manufactured at a low cost, yet has excellent torque transmission performance.

  In order to achieve the above object, the present invention is a power transmission member that has a hollow portion extending along an axis, and the hollow portion is formed by joining a plurality of shaft members. When the members are welded in a state where the end portions are butted together, in two adjacent shaft members, the butted surfaces formed on one shaft member and the butted surfaces formed on the other shaft member are fitted together. Provided is a power transmission member characterized by being formed into a possible tapered shape.

  As described above, in two adjacent shaft members, if the abutting surface formed on one shaft member and the abutting surface formed on the other shaft member are formed in a tapered shape that can be fitted to each other, each shaft member The shape of the joint end portion of each shaft member is simplified as compared with the case where the joint end portions are formed in an inlay shape that fits together. Further, in this case, centering between the shaft members can be performed only by abutting the ends of the two adjacent shaft members. Therefore, when forming the power transmission member having the hollow portion, it is possible to easily and highly accurately position the shaft members while processing the joint end portions of the shaft members relatively easily. Therefore, it is possible to provide a highly accurate power transmission member that is excellent in torque transmission performance while being inexpensively manufactured.

  Furthermore, if the tapered surfaces are abutted as in the present invention, the contact area between two adjacent shaft members can be increased as compared with the case where the flat surfaces in the direction orthogonal to the axis are abutted. . Therefore, the joint strength between the shaft members can be increased to improve the reliability of the power transmission member.

  Two adjacent shaft members can be welded by laser welding or electron beam welding. These welding techniques are techniques for melting and welding the base materials, and according to this, two adjacent shaft members can be joined easily and with high accuracy without generating burrs.

  Two adjacent shaft members can be welded by providing a circumferential groove in the outer diameter of the butted portion of the two adjacent shaft members and irradiating the circumferential groove with a laser or an electron beam. If it does in this way, it will become difficult for the melt | dissolution produced | generated with irradiation of a laser or an electron beam to scatter and adhere to the outer diameter surface of a shaft member. Moreover, the protrusion amount of the welding mark (bead) to the shaft member outer diameter side can be reduced. Therefore, finishing after welding can be simplified or omitted, which is desirable.

  The configuration of the present invention can be applied to a power transmission member in which both of the shaft members located on the most end side and the other end side of the plurality of shaft members have connecting portions for torque transmission. . The connecting portion for torque transmission in this case can be used for connecting the inner joint member of the constant velocity universal joint so that torque can be transmitted. That is, the configuration of the present invention can be preferably applied to, for example, an intermediate shaft for a drive shaft or a propeller shaft that has a connection portion with an inner joint member of a constant velocity universal joint at both axial end portions.

  In the configuration of the present invention, the shaft member located on the most end side of the plurality of shaft members has a torque transmission connecting portion, and the shaft member located on the other end side is located on the inner periphery. The present invention can be applied to a power transmission member having a cup-shaped mouth portion that can accommodate an inner joint member of a constant velocity universal joint. That is, the configuration of the present invention can be preferably applied to an outer joint member for a constant velocity universal joint including a shaft-shaped portion and a mouse portion.

  In the above configuration, the torque transmission connecting portion may be a spline. In addition, the spline as used in the field of this invention consists of many teeth extended in the axial direction in which the peak part and the valley part were alternately formed in the circumferential direction, and is a concept including serration.

  As described above, according to the present invention, when forming a power transmission member having a hollow portion extending along the axis, the joint end portion of each shaft member can be processed relatively easily, and the shaft Centering between members can be performed easily and with high accuracy. Therefore, it is possible to provide a highly accurate power transmission member that is excellent in torque transmission performance while being inexpensively manufactured.

It is a front view which shows the whole structure of the drive shaft which comprises the power transmission member which concerns on one Embodiment of this invention. It is a front view of the intermediate shaft shown in FIG. It is a principal part expanded sectional view of an intermediate shaft, and (a)-(d) figure is all an expanded sectional view showing a modification of a joint mode of an adjacent shaft member. It is a principal part expanded sectional view of an intermediate shaft, and (a) and (b) figure are both expanded sectional views which show the modification of the joining aspect of an adjacent shaft member. It is a principal part expanded sectional view of an intermediate shaft, and (a) and (b) figure are both expanded sectional views which show the modification of the joining aspect of an adjacent shaft member. It is a principal part expanded sectional view of an intermediate shaft, and (a) and (b) figure are both expanded sectional views which show the modification of the joining aspect of an adjacent shaft member. It is a front view of the drive shaft which comprises the power transmission member which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view showing an overall structure of a power transmission device including a power transmission member A according to an embodiment of the present invention. The power transmission device in the illustrated example is a drive shaft DS that transmits power from an engine to driving wheels, and a sliding constant velocity universal joint 10 disposed on the engine side (right side in the figure: hereinafter also referred to as inboard side) and The fixed constant velocity universal joint 20 arranged on the drive wheel side (left side in the figure: hereinafter also referred to as the outboard side) and the two constant velocity universal joints 10 and 20 are connected as a power transmission member A for torque transmission. The intermediate shaft 1 is provided as a main configuration.

  The illustrated sliding type constant velocity universal joint 10 is a so-called double offset type constant velocity universal joint (DOJ). This sliding type constant velocity universal joint 10 is an outer joint having a cup-shaped mouth portion 11a having one end (one end on the outboard side) opened and a shaft portion 11b extending in the axial direction from the bottom on the back side of the mouse portion 11a. A member 11, an inner joint member 12 disposed on the inner diameter side of the outer joint member 11, a track groove 11a1 formed on the inner diameter surface of the mouth portion 11a, and a track groove 12a formed on the outer diameter surface of the inner joint member 12. The plurality of balls 13 that are interposed between the plurality of balls 13 to transmit torque and the inner diameter surface of the mouth portion 11a of the outer joint member 11 and the outer diameter surface of the inner joint member 12 are arranged in the circumferential direction. A retainer 14 that is held at equal intervals is provided as a main configuration. As the sliding type constant velocity universal joint 10, a tripod type constant velocity universal joint (TJ) may be used.

  The fixed type constant velocity universal joint 20 in the illustrated example is a so-called Barfield type constant velocity universal joint (BJ). The fixed type constant velocity universal joint 20 includes an outer joint member 21 having a cup-shaped mouth portion 21a having an open end (one end on the inboard side) and a shaft portion 21b extending in the axial direction from the outer bottom portion of the mouse portion 21a. Between the inner joint member 22 disposed on the inner diameter side of the outer joint member 21, the track groove 21 a 1 formed on the inner diameter surface of the mouth portion 21 a, and the track groove 22 a formed on the outer diameter surface of the inner joint member 22. The plurality of balls 23 that transmit torque by being interposed between the inner diameter surface of the mouth portion 21a of the outer joint member 21 and the outer diameter surface of the inner joint member 22 are arranged at equal intervals in the circumferential direction. And a retainer 24 to be held as a main component. An undercut-free type constant velocity universal joint (UJ) may be used as the fixed type constant velocity universal joint 20.

  The intermediate shaft 1 as the power transmission member A has splines 5 and 5 as connecting portions for torque transmission at outer diameters at both ends. Then, the spline 5 on the inboard side is spline-fitted with the hole of the inner joint member 12 of the sliding type constant velocity universal joint 10, whereby the inner joint member 12 of the intermediate shaft 1 and the sliding type constant velocity universal joint 10. Are coupled so that torque can be transmitted. Further, the spline 5 on the outboard side is spline-fitted with the hole of the inner joint member 22 of the fixed type constant velocity universal joint 20, so that the intermediate shaft 1 and the inner joint member 22 of the fixed type constant velocity universal joint 20 are torqued. It is connected so that it can be transmitted.

  Each constant velocity universal joint 10, 20 is filled with a lubricant such as grease. In order to prevent external leakage of the lubricant and entry of foreign matter from the outside of the joint, the outer joint member between the outer joint member 11 of the sliding type constant velocity universal joint 10 and the intermediate shaft 1 and the outer joint member of the fixed type constant velocity universal joint 20. Cylindrical boots 31 and 32 are respectively mounted between the intermediate shaft 21 and the intermediate shaft 1.

  Hereinafter, the configuration of the intermediate shaft 1 as the power transmission member A will be described in detail.

  As shown in FIG. 2, the intermediate shaft 1 is a hollow type having a hollow portion Is extending along the axis O. The hollow portion Is includes a stub member 3 as the second shaft member A2 at the end portion on the inboard side of the pipe member 2 as the hollow first shaft member A1, and an end portion on the outboard side of the pipe member 2. The stub member 4 as the third shaft member A3 is joined to each other. A spline 5 is formed at the inboard side end of the stub member 3 to connect the intermediate shaft 1 and the inner joint member 12 (see FIG. 1) of the sliding type constant velocity universal joint 10 so as to transmit torque. ing. Further, a spline 5 for connecting the intermediate shaft 1 and the inner joint member 22 (see FIG. 1) of the fixed type constant velocity universal joint 20 so as to be able to transmit torque is formed at the end of the stub member 4 on the outboard side. Has been.

  As shown in the enlarged view of FIG. 2, the pipe member 2 and the stub members 3 and 4 are joined in a state in which the end portions are in contact with each other. Two adjacent members are joined at the formed weld 6.

  The abutting surfaces 2 a and 2 a that are formed on the pipe member 2 with the stub members 3 and 4 are formed as a concave tapered surface 8 whose inner diameter is gradually reduced toward the intermediate portion of the intermediate shaft 1. On the other hand, the abutting surfaces 3 a and 4 a formed on the stub members 3 and 4 with the pipe member 2 gradually decrease in outer diameter toward the intermediate portion of the intermediate shaft 1, and can be fitted to the concave tapered surface 8. It is formed on the tapered surface 7. In the present embodiment, the concave taper surface 8 is formed so as to provide an outer diameter side start point on the end surface of the pipe member 2, and the convex taper surface 7 is provided with an inner diameter side start point on the end surfaces of the stub members 3, 4. It is formed in this way. Therefore, when the ends of the pipe member 2 and the stub members 3 and 4 are abutted (when the convex taper surface 7 and the concave taper surface 8 are fitted), the outer diameter end and the inner diameter end of the abutting portion are Circumferential grooves 9a and 9b are formed, respectively. Thus, if the convex taper surface 7 and the concave taper surface 8 are formed so that the starting point is provided on the end surface of each member, it is possible to avoid the tapered end portion from having a sharp pointed shape. Therefore, it is possible to secure safety when the pipe member 2 or the like is transported manually, which is desirable.

  And the welding part 6 formed by joining the pipe member 2 and the stub member 3 is formed by fitting the concave taper surface 8 on the inboard side of the pipe member 2 and the convex taper surface 7 of the stub member 3. It is formed by irradiating the circumferential groove 9a with a laser or an electron beam. The welded portion 6 formed by joining the pipe member 2 and the stub member 4 is formed by fitting the concave tapered surface 8 on the outboard side of the pipe member 2 and the convex tapered surface 7 of the stub member 4. It is formed by irradiating the circumferential groove 9a with a laser or an electron beam.

  In the present invention, as described above, in the two adjacent shaft members forming the intermediate shaft 1, the other side (here, the pipe member 2) formed on the one side shaft member (here, the stub members 3 and 4) and The abutting surfaces 3 a and 4 a are formed on the convex taper surface 7, and the abutting surfaces 2 a and 2 a with the stub members 3 and 4 formed on the pipe member 2 are formed on the concave taper surface 8 that fits the convex taper surface 7. In this way, the shape of the joint end portion of each shaft member can be simplified as compared with the case where the joint end portions of the shaft members are formed in an inlay shape that fits together. Further, in this case, the positioning (centering) between the shaft members can be performed only by abutting the ends of the two adjacent shaft members. Accordingly, it is possible to provide a highly accurate intermediate shaft 1 that is excellent in torque transmission performance while being inexpensively manufactured.

  Further, as described above, when the convex taper surface 7 and the concave taper surface 8 are abutted and two adjacent shaft members are taper-fitted, the flat surfaces in the direction orthogonal to the axis line are abutted. In comparison, the contact area between two adjacent shaft members can be increased. Therefore, the joint strength between the shaft members can be increased, and the reliability of the intermediate shaft 1 can be improved.

  Moreover, if two adjacent members are welded by irradiating the circumferential groove 9a formed at the outer diameter end of the butted portion with a laser or an electron beam, a melt generated along with the laser or electron beam irradiation However, it becomes difficult to scatter and adhere to the outer diameter surfaces of the pipe member 2 and the stub members 3 and 4. Moreover, the protrusion amount to the outer-diameter side of the welding trace (bead) formed in connection with forming the welding part 6 can be made small. Therefore, finishing after welding can be simplified or omitted. Furthermore, since the circumferential groove 9b is also formed at the inner diameter end of the abutting portion, the amount of protrusion of the welding mark toward the inner diameter side can be reduced.

  In addition, the pipe member 2 and the stub members 3 and 4 can be subjected to a surface hardening treatment for improving the strength as necessary. The surface hardening treatment may be performed on the single pipe member 2 and the stub members 3 and 4 or after the pipe member 2 and the stub members 3 and 4 are joined (welded) to form the intermediate shaft 1. You may do it. There is no particular limitation on the method of the surface hardening treatment, and for example, carburizing treatment, nitriding treatment, or induction hardening can be employed. The surface hardening process may be performed on the entire intermediate shaft 1 or may be partially performed on a part that requires particularly high strength (for example, a part where the spline 5 is formed).

  The intermediate shaft 1 of the above-described embodiment is formed by joining the pipe member 2 and the stub members 3 and 4 having the same inner and outer diameter dimensions to form the hollow portion Is, but the present invention is limited to such a form. The present invention is not applied but can be applied to the intermediate shaft 1 subjected to various changes according to required quality and processing equipment. In the following embodiments (each figure), the vicinity of the joint portion (welded portion 6) between the pipe member 2 and the stub member 4 on the outboard side is extracted from the intermediate shaft 1 described above. Needless to say, a configuration similar to the configuration described below can be adopted for the joining mode of the stub member 3 on the inboard side.

  For example, as shown in FIGS. 3A to 3D, the present invention is preferably applied to the intermediate shaft 1 configured by joining shaft members having different inner diameter dimensions or outer diameter dimensions or both. Can do. FIG. 3A shows a stub member 4 having an inner diameter dimension identical to that of the pipe member 2 and an outer diameter dimension larger than that of the pipe member 2 joined to the pipe member 2. FIG. The stub member 4 whose outer diameter is the same as that of the pipe member 2 and whose inner diameter is smaller than that of the pipe member 2 is joined to the pipe member 2. FIG. 3C shows a pipe member 2 joined with a stub member 4 having an inner diameter dimension and an outer diameter dimension smaller than that of the pipe member 2, and FIG. A stub member 4 having an outer diameter larger than that of the pipe member 2 and an inner diameter smaller than that of the pipe member 2 is joined to the member 2.

  Further, as shown in FIGS. 4A and 4B, the pipe member 2 in which the butt surface 2a with the stub member 4 is formed on the convex taper surface 7 and the butt surface 4a with the pipe member 2 are made into the concave taper surface 8. It is of course possible to form the intermediate shaft 1 by welding the formed stub member 4. FIG. 4A shows an application of this configuration to the case where the pipe member 2 and the stub member 4 having the same inner and outer diameter dimensions are joined. FIG. 4B shows the configuration applied to the pipe member 2. The stub member 4 having the same outer diameter as that of the pipe member 2 and having an inner diameter smaller than that of the pipe member 2 is applied.

  5A and 5B, the concave taper surface 8 (or convex taper surface 7) to be provided on the pipe member 2 and the convex taper surface 7 (or concave taper surface 8 to be provided on the stub member 4). It is also possible to change the inclination angle θ. FIG. 5A shows the obtuse angle θ as compared with the embodiment shown in FIG. 2, and FIG. 5B shows the inclination angle θ as compared with the embodiment shown in FIG. It is an obtuse angle. Thus, if the inclination angle θ is formed to be a more obtuse angle, there is an advantage that the processing can be facilitated. On the other hand, although not shown in the drawings, if the inclination angle θ is formed at an acute angle, there is an advantage that the bonding (contact) area between the shaft members can be further increased and the bonding strength can be further improved.

  Further, as shown in FIGS. 6A and 6B, a chamfer 2 a 1 may be provided on the outer diameter of the end of the pipe member 2. If it does in this way, the opening dimension and volume of the circumferential groove | channel 9a formed in the butt | matching part outer diameter can be expanded. Therefore, there are advantages that it becomes easier to irradiate the laser or electron beam into the circumferential groove 9a, and that the amount of protrusion of the welding trace to the outer diameter side can be further reduced. FIG. 6A is a diagram in which a chamfer 2a1 is provided on the end outer diameter of the pipe member 2 of the embodiment shown in FIG. 2, and FIG. 6B is a pipe of the embodiment shown in FIG. 5A. A chamfer 2 a 1 is provided on the outer diameter of the end of the member 2.

  In the embodiment described above, the outer diameter of the butted portion of the convex taper surface 7 and the concave taper surface 8 is adjusted by devising the outer diameter shape of the end of one of the two adjacent shaft members. Although the circumferential groove 9a is formed, a concave portion (stepped portion), for example, may be formed on the outer diameter of the end of the other shaft member (not shown). In this way, the opening size and volume of the circumferential groove 9a can be further expanded. Therefore, there is an advantage that it becomes easier to irradiate the laser or electron beam into the circumferential groove 9a, and an advantage that the amount of protrusion of the welding mark to the outer diameter side can be further reduced.

  FIG. 7 shows the overall structure of a drive shaft DS according to another embodiment. In the drive shaft DS shown in FIG. 7, components similar to those shown in FIG. 1 are denoted by common reference numerals and redundant description will be omitted, and only different components will be described in detail.

  In the illustrated drive shaft DS, the outer joint member 51 which is one constituent member of the sliding type constant velocity universal joint 10 has the configuration of the power transmission member A according to the present invention described above. That is, the outer joint member 51 of the sliding type constant velocity universal joint 10 has a hollow portion Is extending along the axis O, and the hollow portion Is is a pipe member 52 as a first shaft member A1 that is hollow. The stub member 53 as the second shaft member A2 is joined to the inboard side end portion, and the cup member 54 as the third shaft member A3 is joined to the outboard side end portion of the pipe member 52, respectively. .

  The configuration of the pipe member 52 and the stub member 53 is substantially the same as that of the pipe member 2 and the stub member 3 shown in FIGS. 1 and 2, and only the cup member 54 has the embodiment and configuration shown in FIGS. 1 and 2. It is different. Specifically, the cup member 54 accommodates the inner joint member 12 (and the ball 13 and the cage 14) of the sliding type constant velocity universal joint 10 on the inner periphery at the end on the outboard side, and on the inner diameter surface. It has a cup-shaped mouth portion 54a in which a track groove 54a1 is formed, and a shaft portion 54b extending in the axial direction from the outer bottom portion of the mouse portion 54a. Then, the butt surface 53 a of the stub member 53 formed on the convex taper surface 7 and the butt surface 54 b 1 of the cup member 52 with the pipe member 52, and the stub member 53 of the pipe member 52 formed on the concave taper surface 8. The two adjacent members are welded in a state where the butted surfaces 52a and 52a with the cup-shaped member 54 are fitted to each other. Although detailed illustration is omitted, similar to the embodiment described above, a circumferential groove 9a is provided in the outer diameter of each butted portion of the convex taper surface 7 and the concave taper surface 8, and a laser is provided in the circumferential groove 9a. Or it is desirable to weld two adjacent shaft members by irradiating an electron beam.

  Moreover, although illustration is abbreviate | omitted, of course, it is also possible to apply the structure shown in FIGS. 3-6 to the outer joint member 51 as the power transmission member A. FIG.

  By adopting the above configuration, when forming the outer joint member 51 as the power transmission member A having the hollow portion Is extending along the axis O, it is relatively easy to process the joint end portion of each member. And, positioning between members can be performed easily and with high accuracy. As a result, it is possible to provide the highly accurate outer joint member 51 that is excellent in torque transmission performance while being inexpensively manufactured.

  In the above description, the case where the present invention is applied to the power transmission member A in which the hollow portion Is is formed by joining the three shaft members A1 to A3 has been described. It can be preferably applied to the power transmission member A in which the hollow portion Is is formed by joining four or more shaft members. Further, the case where the power transmission member A according to the present invention is incorporated in the drive shaft DS has been described above, but the present invention is applicable to various power transmission members constituting other power transmission devices such as a propeller shaft. Can also be preferably applied.

1 Intermediate shaft (power transmission member)
2 Pipe member 2a Abutting surface 3, 4 Stub member 3a, 4a Abutting surface 5 Spline (connecting portion for torque transmission)
6 Welded portion 7 Convex taper surface 8 Concave taper surface 9a Circumferential groove with butt portion outer diameter 51 Outer joint member (power transmission member)
54a Mouse part A Power transmission member A1 1st shaft member A2 2nd shaft member A3 3rd shaft member Is Hollow part O Axis line

Claims (7)

A power transmission member having a hollow portion extending along the axis, the hollow portion being formed by joining a plurality of shaft members, in a state where two adjacent shaft members are in contact with each other. In the welded one,
A power transmission member characterized in that, in two adjacent shaft members, a butting surface formed on one shaft member and a butting surface formed on the other shaft member are formed in a tapered shape that can be fitted to each other.   The power transmission member according to claim 1, wherein two adjacent shaft members are welded by laser welding or electron beam welding.   The power transmission according to claim 2, wherein a circumferential groove is provided in an outer diameter of abutting portions of two adjacent shaft members, and the two adjacent shaft members are welded by irradiating the circumferential groove with a laser or an electron beam. Element.   The power transmission member according to any one of claims 1 to 3, wherein, among the plurality of shaft members, both of the shaft members positioned at one end side and the other end side have a torque transmission connecting portion. .   The power transmission member according to claim 4, wherein the connecting portion for torque transmission is for connecting the inner joint member of the constant velocity universal joint so that torque can be transmitted.   Of the plurality of shaft members, the shaft member located on the most end side has a torque transmission connecting portion, and the shaft member located on the most other end side is an inner joint of a constant velocity universal joint on the inner periphery. The power transmission member according to any one of claims 1 to 3, wherein the power transmission member has a cup-shaped mouth portion capable of accommodating the member.   The power transmission member according to any one of claims 4 to 6, wherein the connecting portion for torque transmission is a spline.

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