Welding fixture

Abstract

To provide a welding fixture capable of improving the accuracy of the joining position between a wire member such as a wire and a ring-shaped member and capable of performing stable welding.SOLUTION: Provided is a fixture 1 for welding distal portions of a plurality of wire members 120 to a ring-shaped member 110, including: a ring-shaped member support portion 10 that supports a ring-shaped member 110; and a wire member support portion 20 disposed opposite the ring-shaped member support portion 10 and extending in a direction away from the ring-shaped member support portion 10. The wire member support portion 20 includes: a groove portion 31 in which an unwelded wire member 121 can be placed in the ring-shaped member 110; and a space 32 capable of accommodating a wire member 122 welded to the ring member 110.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a jig for welding distal portions of a plurality of linear members to a ring-shaped member. [Background technology]

[0002] A catheter usually comprises a tube for insertion into a body cavity such as a blood vessel, digestive tract, or urinary tract, and a handle provided on the proximal side of the tube. Some catheters are known that are configured so that the distal end of the tube can be bent by operating the handle on the hand side.

[0003] As such a catheter, there is one in which a wire is arranged in the inner cavity of a tube, the distal end of the wire is fixed to a ring-shaped member arranged at the distal end of the tube, and the proximal end of the wire is connected to a handle, and the distal end of the tube can be bent by operating the handle. For example, in a catheter in which two wires are arranged in the inner cavity of a tube, the distal end of the tube can be bent to one side by pulling one of the two wires proximally by operating the handle, and the distal end of the tube can be bent to the other side by pulling the other wire.

[0004] For example, Patent Document 1 describes a manufacturing jig for wire-attached rings, which has mounting grooves on both side surfaces and a mounting protrusion at the distal end for removably attaching a ring member, wherein the distal ends of the first wire and the second wire can be respectively attached to the mounting grooves in a manner that allows them to move axially and be removably attached, and the ring member can be removably attached to the mounting protrusion of the jig so that the distal ends of the first wire and the second wire protruding from the distal end of the jig contact the inner surface of the through hole of the ring member and protrude through the through hole. Patent Document 2 also describes a joint ring structure in which a plurality of joint rings having a substantially cylindrical portion are arranged adjacent to each other along the axial direction and extend from the base end to the tip, in which each of the plurality of joint rings has a pair of base end crests formed to protrude from the base end surface of the cylindrical portion and arranged in positions substantially symmetrical to each other with respect to the axis, and a pair of tip end crests formed to protrude from the tip end surface of the cylindrical portion and arranged in positions corresponding to the base end crests, and the tip end engages with the most distal joint ring and a plurality of wires are provided whose base ends reach the base end of the joint ring structure. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-163128 A [Patent Document 2] JP 2020-137898 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the mechanism for bending the distal end of the catheter, the ring-shaped member and the wire need to be firmly and precisely joined. In order to make the catheter less invasive, there is a demand for a smaller outer diameter of the catheter shaft, but a tube with a small outer diameter also has a small inner diameter, and the space in the tube in which the ring-shaped member and the wire are placed is also small. In order to increase the joining strength between the ring-shaped member and the wire, it is required to suppress floating of the wire and unevenness in joining that occur when joining the wire to the ring-shaped member, and to achieve stable joining.

[0007] In the configurations described in Patent Documents 1 and 2, the joining and the joining position between the ring-shaped member and the wire are prone to variation, and there is room for improvement in order to achieve a stable joining.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a welding jig that can improve the accuracy of the joining position between a linear member such as a wire and a ring-shaped member, and can perform stable welding. [Means for solving the problem]

[0009] The welding jig of the present invention that can solve the above problems is as follows. [1] A jig for welding distal portions of a plurality of linear members to a ring-shaped member, comprising: A ring-shaped member support portion that supports the ring-shaped member; a linear member support portion disposed opposite the ring-shaped member support portion and extending in a direction away from the ring-shaped member support portion, The linear member support portion is a welding jig having a groove portion in which an unwelded linear member can be placed on the ring-shaped member, and a space on the opposite side of the groove in which a linear member welded to the ring-shaped member can be accommodated. [2] A first state in which a shortest distance between the ring-shaped member support portion and the linear member support portion in a direction from the ring-shaped member support portion to the linear member support portion is a first distance that is greater than an axial length of the ring-shaped member; and a second state in which the shortest distance between the ring-shaped member support portion and the linear member support portion in a direction from the ring-shaped member support portion to the linear member support portion is a second distance smaller than the first distance. [3] A welding jig as described in [2], wherein the ring-shaped member support portion is movable in a direction toward the linear member support portion and in a direction away from the linear member support portion. [4] The welding jig according to any one of [1] to [3], wherein the maximum size of the space in the height direction of the linear member support portion is greater than the maximum depth of the groove portion. [5] A welding jig described in any of [1] to [4], wherein the ring-shaped member support portion has a protrusion that can be inserted into the inner cavity of the ring-shaped member and extends in the axial direction of the ring-shaped member. [6] A welding jig as described in [5], wherein the cross-sectional shape of the protrusion in a cross section perpendicular to the extension direction of the protrusion has a curved portion at the top and a straight portion below the curved portion. [7] The space has an upper wall surface, The welding jig described in [6], wherein when viewed from the extension direction of the space, the straight portion forms an angle with the upper wall surface of 0 degrees or more and 10 degrees or less. [8] The ring-shaped member has a notch extending along an axial direction of the ring-shaped member, The welding jig according to any one of [1] to [7], wherein a linear member that is not welded to the ring-shaped member is placed in the groove and disposed inside the cutout. [9] The protrusion has a recess extending in a direction approaching the linear member support portion, The welding jig according to any one of [5] to [8], wherein, when viewed from the depth direction of the recess, a virtual line passing through one end and the other end of the recess overlaps with the groove.

[10] A welding jig as described in [8] or [9], wherein the width of the groove portion is greater than the width of the cutout portion. Effect of the Invention

[0010] According to the welding jig of the present invention, the linear member support portion supports the unwelded linear member on the ring-shaped member. By having a groove portion where a linear member welded to the ring-shaped member can be accommodated, and a space on the opposite side of the groove where a linear member welded to the ring-shaped member can be accommodated, it is possible to easily align the ring-shaped member and the linear member by placing the linear member in the groove before welding it to the ring-shaped member, and by accommodating the linear member after welding to the ring-shaped member in the space, the linear member after welding is less likely to interfere with welding the ring-shaped member to other linear members, making it easier to weld multiple linear members to the ring-shaped member while aligning them precisely. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view of a welding jig according to an embodiment of the present invention; [Diagram 2] 13 illustrates a perspective view of a ring-shaped member having distal portions of multiple linear members welded together. [Diagram 3] 2 is a top view of the welding jig shown in FIG. 1 in a first state. [Figure 4] 2 is a top view of the welding jig shown in FIG. 1 in a second state. [Diagram 5] FIG. 2 is a side view of the welding jig shown in FIG. [Figure 6] 2 is a perspective view of a protrusion of the welding jig shown in FIG. 1 . [Figure 7] 2 is a cross-sectional view perpendicular to the extending direction of a protrusion of the welding jig shown in FIG. 1. [Figure 8] 13 is a cross-sectional view perpendicular to the extending direction of a ring-shaped member support portion of a welding jig in another embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in more detail below based on the following embodiments, but the present invention is not limited to the following embodiments, and can be modified as long as it meets the purpose described above and below, and all of these modifications are included in the technical scope of the present invention. In addition, hatching and component symbols may be omitted in each drawing for convenience, but in such cases, the specification and other drawings should be referred to. In addition, the dimensions of various components in the drawings may differ from the actual dimensions because priority is given to helping understand the features of the present invention.

[0013] FIG. 1 is a perspective view of a welding jig 1 according to an embodiment of the present invention, and FIG. 2 is a perspective view of a ring-shaped member 110 to which distal portions of a plurality of linear members 120 are welded. FIG. 1 illustrates a state in which the linear members 120 are welded to the ring-shaped member 110 using the welding jig 1, and the ring-shaped member 110 and the linear members 120 are arranged on the welding jig 1. As shown in FIG. 1, the welding jig 1 is a jig for welding distal portions of a plurality of linear members 120 to the ring-shaped member 110, and has a ring-shaped member support part 10 that supports the ring-shaped member 110, and a linear member support part 20 that is arranged opposite the ring-shaped member support part 10 and extends in a direction away from the ring-shaped member support part 10.

[0014] It is preferable that the welding jig 1 is one used in the manufacture of a movable-tip catheter having a tube, a ring-shaped member 110 disposed in the inner cavity of the distal end of the tube, and a number of linear members 120 whose distal ends are welded to the ring-shaped member 110.

[0015] 2, distal portions of a plurality of linear members 120 are welded to a ring-shaped member 110. By disposing the ring-shaped member 110 to which the distal portions of the plurality of linear members 120 are welded in the inner cavity of a tube that constitutes the shaft of a catheter and connecting the proximal portions of the plurality of linear members 120 to a handle, it becomes possible to bend the distal end portion of the tube by operating the handle.

[0016] The ring-shaped member 110 is a ring-shaped member. Examples of the shape of the ring-shaped member 110 include a cylindrical shape, a polygonal cylindrical shape, a shape with a C-shaped cross section with a notch in a cylinder, and a coil shape with a wound wire. Among them, the shape of the ring-shaped member 110 is preferably cylindrical. By having the ring-shaped member 110 have a cylindrical shape, the surface of the ring-shaped member 110 becomes smooth. Therefore, in a catheter, even if the surface of the ring-shaped member 110 comes into contact with a tube, it is possible to make it difficult for the tube to be damaged.

[0017] Examples of materials constituting the ring-shaped member 110 include metals such as stainless steel, carbon steel, titanium, nickel-titanium alloy, cobalt-chromium alloy, and tungsten alloy; synthetic resins such as aromatic polyether ketone resin (e.g., PEEK), polycarbonate resin, and fiber-reinforced resin; synthetic rubbers such as butadiene rubber, isoprene rubber, styrene butadiene rubber, ethylene propylene rubber, acrylic rubber, and silicone rubber; and natural rubber. Among these, the material constituting the ring-shaped member 110 is preferably a metal, and more preferably stainless steel. By using a metal as the material constituting the ring-shaped member 110, the strength of the ring-shaped member 110 is increased, and the ring-shaped member 110 is less likely to break even if the distal end of the tube is repeatedly bent.

[0018] The linear member 120 may be a single wire or may have a configuration made up of multiple wires. That is, the linear member 120 may be a solid wire or a twisted wire. In particular, the linear member 120 is preferably a solid wire. When the linear member 120 is a solid wire, welding between the linear member 120 and the ring-shaped member 110 can be easily performed, and the linear member 120 can be easily joined to the ring-shaped member 110 firmly.

[0019] The shape of the cross section perpendicular to the longitudinal axis direction of the linear member 120 can be, for example, a circle, an oval, a polygon, or a combination of these. Among these, the shape of the cross section perpendicular to the longitudinal axis direction of the linear member 120 is preferably a circle. When the cross section shape of the linear member 120 is a circle, the surface of the linear member 120 becomes smooth. Therefore, even if the linear member 120 comes into contact with the tube in the lumen of the tube, the tube is less likely to be damaged.

[0020] Examples of materials constituting the linear member 120 include metals such as stainless steel, titanium, nickel-titanium alloy, cobalt-chromium alloy, and tungsten alloy, and fibers such as polyarylate fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, PBO fiber, and carbon fiber. The fibers may be monofilaments or multifilaments. Among them, the material constituting the linear member 120 is preferably a metal, and more preferably stainless steel. By using a metal as the material constituting the linear member 120, the strength of the linear member 120 can be increased, and the linear member 120 can be made less likely to be damaged even if the linear member 120 is pulled toward the hand side due to bending of the distal end of the tube.

[0021] The material constituting the linear member 120 may be different from the material constituting the ring-shaped member 110, but is preferably the same as the material constituting the ring-shaped member 110. By using the same material constituting the linear member 120 as the material constituting the ring-shaped member 110, the bonding strength between the ring-shaped member 110 and the linear member 120 can be easily increased.

[0022] As shown in FIG. 1, the welding jig 1 has a ring-shaped member support part 10 and a linear member support part 20. The ring-shaped member support part 10 supports a ring-shaped member 110. The linear member support part 20 is disposed opposite the ring-shaped member support part 10 and extends in a direction away from the ring-shaped member support part 10. In other words, the linear member support part 20 is disposed opposite the ring-shaped member support part 10 in the direction in which the ring-shaped member support part 10 is disposed. In welding the linear member 120 to the ring-shaped member 110, the welding jig 1 supports the ring-shaped member 110 by the ring-shaped member support part 10, and supports the linear member 120 by the linear member support part 20.

[0023] Examples of materials constituting the ring-shaped member support part 10 include metals such as iron, copper, aluminum, or alloys thereof, and synthetic resins such as acrylic resins and aromatic polyether ketone resins (e.g., PEEK). For example, examples of iron alloys include stainless steel, examples of copper alloys include brass, and examples of aluminum alloys include duralumin. Among these, it is preferable that the material constituting the ring-shaped member support part 10 is different from the material constituting the ring-shaped member 110 and the material constituting the linear member 120. By using a material constituting the ring-shaped member support part 10 that is different from the materials constituting the ring-shaped member 110 and the linear member 120, it is possible to reduce the risk of the ring-shaped member support part 10 being welded together when the linear member 120 is welded to the ring-shaped member 110.

[0024] Moreover, the material constituting the ring-shaped member support part 10 is preferably a material different from the material constituting the ring-shaped member 110 and the linear member 120 and is preferably a metal. Specifically, when the material constituting the ring-shaped member 110 and the linear member 120 is stainless steel, the material constituting the ring-shaped member support part 10 is preferably brass. By making the material constituting the ring-shaped member support part 10 a metal and a material different from the material constituting the ring-shaped member 110 and the linear member 120, the strength of the ring-shaped member support part 10 can be increased while preventing the ring-shaped member support part 10 from being welded together when welding the ring-shaped member 110 and the linear member 120. Therefore, even if the ring-shaped member 110 is repeatedly attached and detached to and from the ring-shaped member support part 10, the ring-shaped member support part 10 is less likely to be damaged, such as deformed.

[0025] Examples of materials constituting the linear member support part 20 include metals such as iron, copper, aluminum, or alloys thereof, and synthetic resins such as acrylic resins and aromatic polyether ketone resins (e.g., PEEK). Among these, the material constituting the linear member support part 20 is preferably a synthetic resin. By using a synthetic resin as the material constituting the linear member support part 20, the weight of the linear member support part 20 is less likely to become heavy. As a result, the overall weight of the welding jig 1 can be reduced, and the welding jig 1 can be made easy to handle. In addition, by using a synthetic resin as the material constituting the linear member support part 20, it is possible to make it less likely to damage other objects such as the linear members 120 when the linear member support part 20 comes into contact with the other objects.

[0026] As shown in FIG. 1, the linear member support portion 20 has a groove portion 31 in which an unwelded linear member 121 can be placed on the ring-shaped member 110, and a space 32 on the opposite side of the groove portion 31 in which a linear member 122 welded to the ring-shaped member 110 can be accommodated.

[0027] The space 32 is located on the opposite side of the groove portion 31. That is, the space 32 is located on the surface of the linear member support portion 20 opposite to the surface on which the groove portion 31 is located. Specifically, in the welding jig 1 shown in FIG. 1 , the groove portion 31 is arranged on the upper surface of the linear member support portion 20, and the space 32 is arranged on the lower surface of the linear member support portion 20.

[0028] The space 32 of the linear member support part 20 only needs to be capable of accommodating the linear member 122 welded to the ring-shaped member 110, and may be, for example, a groove formed in the linear member support part 20. In addition, for example, the linear member support part 20 may be configured to have a top plate part and legs, and the space 32 may be formed below the top plate part and around the periphery of the legs.

[0029] In welding the ring-shaped member 110 and the linear member 120 using the welding jig 1, the linear member 121 before being welded to the ring-shaped member 110 is placed in the groove 31 of the linear member support part 20, and the linear member 122 after being welded to the ring-shaped member 110 is accommodated in the space 32 of the linear member support part 20. Specifically, the linear member 120 is placed in the groove 31, the linear member 121 placed in the groove 31 is welded to the ring-shaped member 110 supported by the ring-shaped member support part 10, and the ring-shaped member 110 is rotated, moved, or the like, to accommodate the linear member 122 welded to the ring-shaped member 110 in the space 32.

[0030] Since the linear member support portion 20 has the groove portion 31 in which the linear member 121 that is not welded to the ring-shaped member 110 can be placed, the linear member 121 before being welded to the ring-shaped member 110 is placed in the groove portion 31, which makes it easier to align the ring-shaped member 110 with the linear member 121. Therefore, it is easy to place the linear member 120 on the ring-shaped member 110 at a desired position with high precision, and it is easy to manufacture a ring-shaped member 110 in which the linear member 120 is welded at a precise position.

[0031] Furthermore, since the linear member support portion 20 has the space 32 capable of accommodating the linear members 122 welded to the ring-shaped member 110, by accommodating the linear members 122 after welding to the ring-shaped member 110 in the space 32, it is possible to make it less likely that the welded linear members 122 will interfere with welding the ring-shaped member 110 to other linear members 121 before welding. As a result, it becomes easier to weld the multiple linear members 120 to the ring-shaped member 110 while aligning them with high precision.

[0032] The ring-shaped member 110 and the linear member 120 are joined by welding, but joining methods other than welding can also be used. Methods other than welding for joining the ring-shaped member 110 and the linear member 120 include, for example, adhesion, melting, brazing, and the like. Among these, it is preferable for the ring-shaped member 110 and the linear member 120 to be joined by welding. By joining the ring-shaped member 110 and the linear member 120 by welding, it is possible to easily increase the joining strength between the ring-shaped member 110 and the linear member 120.

[0033] It is preferable that the welding points of the ring-shaped member 110 to the linear member 120 are at least on the outer surface of the ring-shaped member 110. Specifically, when the ring-shaped member 110 and the linear member 120 are welded together, it is preferable that the welding is performed from the outside of the ring-shaped member 110, and the ring-shaped member 110 and the linear member 120 are welded together at least on the outer surface of the ring-shaped member 110. By having the welding points of the ring-shaped member 110 to the linear member 120 at least on the outer surface of the ring-shaped member 110, it becomes easier to weld the ring-shaped member 110 to the linear member 120, and it becomes possible to improve the accuracy of alignment between the ring-shaped member 110 and the linear member 120 and to increase the weld strength.

[0034] 1, the welding jig 1 preferably has a pedestal 40 for fixing the ring-shaped member support part 10 and the linear member support part 20. The ring-shaped member support part 10 and the linear member support part 20 are preferably placed and fixed on the pedestal 40. Since the welding jig 1 has the pedestal 40, the ring-shaped member support part 10 and the linear member support part 20 can be stably arranged, making it easier to weld the ring-shaped member 110 and the linear member 120 together.

[0035] Examples of the material constituting the base 40 include metals such as iron, copper, aluminum, and alloys thereof, and synthetic resins such as acrylic resins and aromatic polyether ketone resins (e.g., PEEK). Among them, the material constituting the base 40 is preferably a synthetic resin. By using a synthetic resin as the material constituting the base 40, the overall weight of the welding jig 1 can be reduced, and the welding jig 1 can be easily handled. In addition, by using a synthetic resin as the material constituting the base 40, it is possible to reduce the risk of damaging other objects such as the ring-shaped member 110 and the linear member 120 when they come into contact with the base 40. It is more preferable that the material constituting the base 40 is the same as the material constituting the linear member support portion 20.

[0036] Fig. 3 is a top view of the welding jig 1 in a first state, and Fig. 4 is a top view of the welding jig 1 in a second state. As shown in Fig. 3 and Fig. 4, the welding jig 1 preferably has a first state in which the shortest distance between the ring-shaped member support part 10 and the linear member support part 20 in the direction from the ring-shaped member support part 10 to the linear member support part 20 is a first distance D1 that is greater than the axial length L1 of the ring-shaped member 110, and a second state in which the shortest distance between the ring-shaped member support part 10 and the linear member support part 20 in the direction from the ring-shaped member support part 10 to the linear member support part 20 is a second distance D2 that is smaller than the first distance D1.

[0037] The fact that the welding jig 1 has a first state and a second state indicates that at least one of the ring-shaped member support part 10 and the linear member support part 20 is movable. Because the welding jig 1 has a first state and a second state, the distance between the ring-shaped member support part 10 and the linear member support part 20 in the direction from the ring-shaped member support part 10 to the linear member support part 20 can be changed, making it easier to attach and detach the ring-shaped member 110 to the ring-shaped member support part 10 and easier to align the ring-shaped member 110 and the linear member 120. It can be made easier.

[0038] It is preferable that the ring-shaped member support part 10 is movable in a direction approaching the linear member support part 20 and in a direction away from the linear member support part 20. Since the ring-shaped member support part 10 is movable in a direction approaching the linear member support part 20 and in a direction away from the linear member support part 20, a load is not easily applied to the linear member 120 supported by the linear member support part 20 by moving the ring-shaped member support part 10 when aligning the ring-shaped member 110 and the linear member 120 or removing the ring-shaped member 110 from the ring-shaped member support part 10. As a result, when welding the linear member 120 to the ring-shaped member 110, damage such as bending of the linear member 120 is not easily caused.

[0039] The linear member support part 20 may be movable in at least one of a direction toward the ring-shaped member support part 10 and a direction away from the ring-shaped member support part 10, but it is preferable that it cannot move in either direction. By making the linear member support part 20 immovable, a load caused by the movement of the linear member support part 20 is less likely to be applied to the linear member 120 supported by the linear member support part 20, making it easier to prevent damage to the linear member 120.

[0040] Fig. 5 is a side view of the welding jig 1, as viewed from the linear member support part 20 side. As shown in Fig. 5, the depth direction of the groove 31 is preferably vertical. Since the depth direction of the groove 31 of the linear member support part 20 is vertical, the linear member 120 can be placed and supported in the groove 31 before being welded to the ring-shaped member 110. As a result, it becomes easier to adjust the welding position between the ring-shaped member 110 and the linear member 120.

[0041] As shown in FIG. 5, the maximum size D4 of the space 32 in the height direction of the linear member support portion 20 is preferably larger than the maximum depth D3 of the groove portion 31. As shown in FIG. 5, when the depth direction of the groove portion 31 is vertical, the maximum depth D3 of the groove portion 31 indicates the maximum distance from the opening of the groove portion 31 to the bottom in the vertical direction. Also, as shown in FIG. 5, the maximum size D4 of the space 32 in the height direction of the linear member support portion 20 indicates the maximum distance of the space 32 in the vertical direction. Since the maximum size D4 of the space 32 is larger than the maximum depth D3 of the groove portion 31, it is possible to accommodate the linear member 122 welded to the ring-shaped member 110 deep inside the space 32. As a result, the distance between adjacent linear members 120 in the circumferential direction of the ring-shaped member 110 can be increased, making it easier to weld the ring-shaped member 110 and the linear member 120.

[0042] The maximum size D4 of the space 32 in the height direction of the linear member support part 20 is preferably 5 times or more, more preferably 10 times or more, and even more preferably 15 times or more, of the maximum depth D3 of the groove part 31. By setting the lower limit of the ratio of the maximum size D4 of the space 32 to the maximum depth D3 of the groove part 31 within the above range, it is possible to easily accommodate the linear member 122 welded to the ring-shaped member 110 in the space 32. Moreover, the maximum size D4 of the space 32 is preferably 100 times or less, more preferably 95 times or less, and even more preferably 90 times or less, of the maximum depth D3 of the groove part 31. By setting the upper limit of the ratio of the maximum size D4 of the space 32 to the maximum depth D3 of the groove part 31 within the above range, it is possible to prevent the size of the space 32 from becoming too large, and to increase the strength of the linear member support part 20.

[0043] Fig. 6 is a perspective view of the protrusion 11 of the welding jig 1, and Fig. 7 is a cross-sectional view perpendicular to the extending direction of the protrusion 11 of the ring-shaped member support part 10 of the welding jig 1. As shown in Figs. 6 and 7, it is preferable that the ring-shaped member support part 10 has the protrusion 11 that can be inserted into the inner cavity of the ring-shaped member 110 and extends in the axial direction of the ring-shaped member 110. Since the ring-shaped member support part 10 has the protrusion 11, it is possible to support the ring-shaped member 110 from the inside of the ring-shaped member 110. This makes it easier to stably weld the ring-shaped member 110 and the linear member 120 together.

[0044] It is preferable that the length of the protruding portion 11 in the extension direction is longer than the axial length of the ring-shaped member 110. By making the length of the protruding portion 11 in the extension direction longer than the axial length of the ring-shaped member 110, it becomes possible for the protruding portion 11 to support the entire ring-shaped member 110 in the axial direction. Therefore, the ring-shaped member 110 can be more stably supported by the ring-shaped member support portion 10.

[0045] Fig. 8 is a cross-sectional view perpendicular to the extending direction of a ring-shaped member support part 10 of a welding jig 1 in another embodiment of the present invention. As shown in Fig. 8, the ring-shaped member support part 10 extends in the axial direction of the ring-shaped member 110 and may be configured to have a pedestal part 70 having a recess 71 on which the ring-shaped member 110 can be placed. Since the ring-shaped member support part 10 is configured to have the pedestal part 70, the ring-shaped member support part 10 can support the ring-shaped member 110 from the outside of the ring-shaped member 110.

[0046] 8, it is preferable that the maximum depth D5 of the recess 71 of the base portion 70 of the ring-shaped member support portion 10 is smaller than the radius of the outer diameter of the ring-shaped member 110. By making the maximum depth D5 of the recess 71 of the base portion 70 smaller than the radius of the outer diameter of the ring-shaped member 110, it becomes easier to weld the multiple linear members 120 to the outer periphery of the ring-shaped member 110. Note that, when the recess 71 of the base portion 70 has a groove 72 described later, the maximum depth D5 of the recess 71 of the base portion 70 does not include the depth of the groove 72.

[0047] It is preferable that the recess 71 of the base portion 70 of the ring-shaped member support portion 10 further has a groove 72 for accommodating the linear member 120 welded to the ring-shaped member 110. Since the recess 71 of the base portion 70 has the groove 72 for accommodating the linear member 120, the ring-shaped member support portion 10 can stably support the ring-shaped member 110 even in the case of the ring-shaped member 110 after the linear member 120 has been welded.

[0048] As shown in FIG. 7, the cross-sectional shape of the protruding portion 11 in a cross section perpendicular to the extending direction of the protruding portion 11 preferably has a curved portion 12 at the top and a straight portion 13 below the curved portion 12. The extending direction of the straight portion 13 in a cross section perpendicular to the extending direction of the protruding portion 11 may be horizontal or vertical. Since the cross-sectional shape of the protruding portion 11 has the curved portion 12 at the top and the straight portion 13 below the curved portion 12, the curved portion 12 supports the upper portion of the ring-shaped member 110 from the inside of the ring-shaped member 110, while the protruding portion 11 has the straight portion 13 below the curved portion 12, so that the linear member 122 welded to the ring-shaped member 110 is less likely to interfere with the protruding portion 11. Therefore, the ring-shaped member 110 in which the protruding portion 11 is inserted into the inner cavity can be easily rotated. In addition, when the ring-shaped member 110 with the protrusion 11 inserted into the inner cavity is rotated, the linear member 120 welded to the ring-shaped member 110 is less likely to come into contact with the protrusion 11, making it less likely that the linear member 120 will be damaged, such as by bending.

[0049] As shown in FIG. 7, the cross-sectional shape of the protruding portion 11 in a cross section perpendicular to the extending direction of the protruding portion 11 preferably has both a straight portion 13 extending horizontally below the curved portion 12 and a straight portion 13a extending vertically below the curved portion 12. By having a straight portion 13 extending horizontally and a straight portion 13a extending vertically downward, the effect of preventing the linear member 122 welded to the ring-shaped member 110 from interfering with the protrusion 11 can be further enhanced.

[0050] As shown in FIG. 5, the space 32 has an upper wall surface 21, and the angle that the straight line portion 13 makes with the upper wall surface 21 is preferably 0 degrees or more and 10 degrees or less (including 0 degrees) when viewed from the extending direction of the space 32. In FIG. 5, when the welding jig 1 is viewed from the linear member support portion 20 side, the straight line portion 13 overlaps and coincides with the upper wall surface 21, and the angle that the straight line portion 13 makes with the upper wall surface 21 is 0 degrees. Since the angle that the straight line portion 13 makes with the upper wall surface 21 is 0 degrees or more and 10 degrees or less, when the linear member 120 welded to the ring-shaped member 110 is accommodated inside the space 32, the linear member 120 is less likely to come into contact with the upper wall surface 21 of the space 32. As a result, it is possible to make it difficult for the linear member 120 welded to the ring-shaped member 110 to come into contact with the upper wall surface 21 of the space 32 and break, such as bending the linear member 120.

[0051] It is more preferable that the straight line portion 13 is parallel to the upper wall surface 21 when viewed from the extension direction of the space 32. In other words, it is more preferable that the angle that the straight line portion 13 forms with the upper wall surface 21 is 0 degrees when viewed from the extension direction of the space 32. By having the straight line portion 13 parallel to the upper wall surface 21, the linear member 120 welded to the ring-shaped member 110 and the upper wall surface 21 are less likely to come into contact with each other.

[0052] 2 and 6, the ring-shaped member 110 has a cutout portion 111 extending along the axial direction of the ring-shaped member 110, and the linear member 121 that is not welded to the ring-shaped member 110 is preferably placed in the groove portion 31 and disposed inside the cutout portion 111. By placing the linear member 121 that is not welded to the ring-shaped member 110 in the groove portion 31 and disposed inside the cutout portion 111, when the linear member 120 is welded to the ring-shaped member 110, the unwelded linear member 121 is disposed both inside the groove portion 31 and the cutout portion 111. As a result, the groove portion 31 and the cutout portion 111 make it possible to increase the accuracy of alignment between the ring-shaped member 110 and the unwelded linear member 121.

[0053] As shown in Fig. 7, the protruding portion 11 has a recessed portion 33 extending in a direction approaching the linear member support portion 20, and it is preferable that an imaginary straight line passing through one end and the other end of the recessed portion 33 overlaps with the groove portion 31 when viewed from the depth direction of the recessed portion 33. In other words, it is preferable that the recessed portion 33 extends in a direction toward the linear member support portion 20, and that the extending direction of the recessed portion 33 of the protruding portion 11 is the same as the extending direction of the groove portion 31 of the linear member support portion 20 when viewed from above the welding jig 1. Since the imaginary straight line passing through one end and the other end of the recessed portion 33 overlaps with the groove portion 31, it is possible to prevent the positional deviation between the ring-shaped member 110 and the linear member 120 from occurring when welding the ring-shaped member 110 and the linear member 120.

[0054] The length of the cutout portion 111 in the axial direction of the ring-shaped member 110 is preferably shorter than the axial length of the ring-shaped member 110. When the length of the cutout portion 111 is shorter than the axial length of the ring-shaped member 110, it becomes easier to align the ring-shaped member 110 and the linear member 120.

[0055] The width of the groove 31 is preferably larger than the width of the cutout 111. By making the width of the groove 31 larger than the width of the cutout 111, it becomes easier to place the linear member 120 in the groove 31 while aligning the ring-shaped member 110 and the linear member 120. Therefore, welding of the ring-shaped member 110 and the linear member 120 can be performed efficiently.

[0056] The width of the groove 31 is preferably 1.05 times or more, more preferably 1.10 times or more, and even more preferably 1.15 times or more, of the width of the cutout 111. By setting the lower limit of the ratio between the width of the groove 31 and the width of the cutout 111 within the above range, it becomes easier to arrange the linear member 121 that is not welded to the ring-shaped member 110 inside the cutout 111 while also arranging it inside the groove 31. Therefore, it is easier to align the ring-shaped member 110 and the linear member 120. In addition, the width of the groove 31 is preferably 3.0 times or less, more preferably 2.5 times or less, and even more preferably 2.0 times or less, of the width of the cutout 111. By setting the upper limit of the ratio between the width of the groove 31 and the width of the cutout 111 within the above range, it becomes easier to align the ring-shaped member 110 and the linear member 120, and it becomes harder for misalignment to occur between the ring-shaped member 110 and the linear member 120. [Explanation of symbols]

[0057] 1: Welding fixture 10: Ring-shaped member support part 11:Protrusion 12: Music section 13: Straight section 13a: Straight section 20: Linear member support part 21: Upper wall 31: Groove 32: Space 33: Recess 40: Pedestal 70: Base 71: Recess 72: Groove 110: Ring-shaped member 111: Notch 120: Linear member 121: Linear member not welded to ring-shaped member 122: Linear member welded to ring-shaped member L1: Axial length of the ring-shaped member D1: First distance D2: 2nd distance D3: Maximum depth of groove D4: Maximum size of space D5: Maximum depth of recess

Claims

1. A jig for welding distal portions of a plurality of linear members to a ring-shaped member, comprising: A ring-shaped member support portion that supports the ring-shaped member; a linear member support portion disposed opposite the ring-shaped member support portion and extending in a direction away from the ring-shaped member support portion, The linear member support portion is a welding jig having a groove portion in which an unwelded linear member can be placed on the ring-shaped member, and a space on the opposite side of the groove in which a linear member welded to the ring-shaped member can be accommodated.

2. a first state in which a shortest distance between the ring-shaped member support portion and the linear member support portion in a direction from the ring-shaped member support portion to the linear member support portion is a first distance that is greater than an axial length of the ring-shaped member; The welding jig as described in claim 1, further comprising: a first state in which the shortest distance between the ring-shaped member support portion and the linear member support portion in a direction from the ring-shaped member support portion to the linear member support portion is a second distance that is smaller than the first distance.

3. The welding jig according to claim 2 , wherein the ring-shaped member support portion is movable in a direction toward the linear member support portion and in a direction away from the linear member support portion.

4. The welding jig according to claim 1 or 2, wherein a maximum size of the space in a height direction of the linear member support portion is greater than a maximum depth of the groove portion.

5. 3. The welding jig according to claim 1, wherein the ring-shaped member support portion has a protrusion that is insertable into an inner cavity of the ring-shaped member and extends in an axial direction of the ring-shaped member.

6. The welding jig according to claim 5 , wherein a cross-sectional shape of the protrusion in a cross section perpendicular to an extending direction of the protrusion has a curved portion at an upper portion and a straight portion below the curved portion.

7. The space has an upper wall surface, The welding jig according to claim 6 , wherein an angle between the straight portion and the upper wall surface when viewed from the extending direction of the space is equal to or greater than 0 degrees and equal to or less than 10 degrees.

8. the ring-shaped member has a notch extending along an axial direction of the ring-shaped member, The welding jig according to claim 5 , wherein the linear member that is not welded to the ring-shaped member is placed in the groove and disposed inside the cutout.

9. the protruding portion has a recessed portion extending in a direction approaching the linear member support portion, The welding jig according to claim 8 , wherein an imaginary line passing through one end and the other end of the recess overlaps with the groove when viewed in a depth direction of the recess.

10. The welding jig according to claim 8 , wherein the groove portion has a width greater than a width of the notch portion.

Images