JP2023104474A - Method for manufacturing thin cylindrical sleeve, and torque sensor - Google Patents

Abstract

To improve positioning accuracy of welding.SOLUTION: A method for manufacturing a thin cylindrical sleeve 30 bends a thin plate 38 in a cylindrical shape and holds the bent thin plate 38 by a holding jig 110, and welds a butted part 40 of the thin plate 38 in a circumferential direction of a cylinder, wherein the holding jig 110 is formed with a projection 114 engaged with the thin cylindrical sleeve 30, the thin cylindrical sleeve 30 is formed with an engagement part 35 composed of a hole or a notch engaged with the projection 114 of the holding jig 110 at a position opposite to a joint range 45 that is a range where the butted part 40 in the circumferential direction is positioned across a shaft center C of the cylinder, and the thin cylindrical sleeve 30 engages the engagement part 35 of the thin cylindrical sleeve 30 before welding of the butted part 40 with the projection 114 of the holding jig 110, holds the butted part 40 by the holding jig 110, and welds the butted part 40.SELECTED DRAWING: Figure 12

Description

The present disclosure relates to a method of manufacturing a thin cylindrical sleeve and a torque sensor.

A torque sensor for detecting torque applied to a rotating body is attached to the rotating body and detects torque by detecting angular displacement in the direction of rotation of the rotating body when rotational torque acts on the rotating body. is possible. For example, in the torque sensor described in Patent Literature 1, a rotor disk to be detected by a detection circuit is attached to a shaft member by a sleeve that is a cylindrical support structure. This allows the torque sensor to detect the angular displacement in the direction of rotation of the shaft member, which is a rotating body, via the rotor disk by means of the detection circuit, thereby detecting the torque acting on the shaft member.

EP-A-2383558

Various methods are conceivable for manufacturing a thin cylindrical sleeve such as a sleeve attached to a shaft member that is a rotating body. A method of forming a cylindrical shape by rolling a substantially rectangular thin plate into a cylindrical shape and welding the butted portions by laser welding is conceivable. A thin cylindrical sleeve can be manufactured by welding thin plates that are rolled into a cylindrical shape in this way. Therefore, there is a possibility that the holding force when attached to the shaft member may be reduced.

Since the displacement of the welding position of the thin cylindrical sleeve is also related to the holding force of the thin cylindrical sleeve on the shaft member, in order to secure the holding force of the thin cylindrical sleeve above a certain level, it is necessary to check the welding position with a camera after welding. It is necessary to carefully examine the deviation of the welding position and discard the thin cylindrical sleeve with a large deviation of the welding position. However, if a thin cylindrical sleeve with a large welding position deviation is discarded, there is a possibility that the yield will decrease. Therefore, there is room for improvement in terms of displacement of the welding position when welding is performed to manufacture a thin cylindrical sleeve.

The present disclosure has been made in view of the above, and an object of the present disclosure is to provide a method of manufacturing a thin cylindrical sleeve and a torque sensor that can improve the positional accuracy of welding.

A method for manufacturing a thin cylindrical sleeve according to the present disclosure is a method for manufacturing a thin cylindrical sleeve in which a thin plate is bent into a cylindrical shape and held by a holding jig, and the butted portions of the thin plates in the circumferential direction of the cylinder are welded. The holding jig is formed with a protrusion that engages with the thin cylindrical sleeve, and the thin cylindrical sleeve has a joint range in which the abutted portion in the circumferential direction is located. Engagement portions consisting of holes or notches that engage with the protrusions of the holding jig are formed at positions opposite to each other across the center, and the thin cylindrical sleeve is the thin cylindrical sleeve before welding of the butt portions. The engaging portion of is engaged with the protrusion of the holding jig and held by the holding jig to weld the butted portion.

According to this configuration, when welding the butted portions, the engaging portion of the thin cylindrical sleeve is engaged with the protrusion of the holding jig, so that the thin cylindrical sleeve moves during welding of the butted portions. Since it is possible to suppress the folding, it is possible to appropriately weld the butt portion. In addition, the engaging portion of the thin cylindrical sleeve is positioned opposite to the joining range, which is the range where the butting portion is located, in the radial direction of the thin cylindrical sleeve across the axis of the cylinder that is the shape of the thin cylindrical sleeve. , the abutted portion can be welded at an appropriate position regardless of the diameter error in manufacturing the thin cylindrical sleeve. As a result, the welding position accuracy can be improved.

As a desirable form, with respect to the thin cylindrical sleeve in a state where the thin cylindrical sleeve is held by the holding jig, from the side opposite to the side where the holding jig is located, at a position corresponding to the welded portion of the butted portion The thin cylindrical sleeve is covered with a cover jig having a through hole, and the butted portion is welded from the through hole of the cover jig.

According to this configuration, the thin cylindrical sleeve is covered with the cover jig, and the butt portion of the thin cylindrical sleeve is welded through the through hole formed in the cover jig. Welding can be performed while supporting from both sides in the vertical direction with tools. As a result, when welding is performed by bending the thin plate into a cylindrical shape and holding it with a holding jig, the thin cylindrical sleeve before welding can be held more reliably, and the positional deviation of the thin cylindrical sleeve can be prevented. Displacement of the welding position can be suppressed. As a result, the welding position accuracy can be improved.

As a desirable form, the holding jig is provided with support surfaces contacting the thin cylindrical sleeve on both sides of the protrusion in the circumferential direction, and the cover jig is provided with support surfaces on both sides of the through hole in the circumferential direction. forming a support surface in contact with the thin cylindrical sleeve, and supporting the thin cylindrical sleeve by bringing the support surface of the holding jig and the support surface of the cover jig into contact with the thin cylindrical sleeve, Welding of the butted portion is performed.

According to this configuration, the thin cylindrical sleeve brings the support surfaces formed on both sides of the protrusion in the holding jig and the support surfaces formed on both sides of the through hole in the cover jig into contact with the thin cylindrical sleeve. Therefore, the thin cylindrical sleeve before welding can be fixed and held by the holding jig and the cover jig. Therefore, it is possible to suppress the displacement of the welding position caused by the displacement of the thin cylindrical sleeve. As a result, the welding position accuracy can be improved.

Desirably, the engaging portion of the thin cylindrical sleeve is formed in a non-press-fitting region other than the press-fitting region where the shaft member to which the thin cylindrical sleeve is attached is press-fitted into the thin cylindrical sleeve.

According to this configuration, since the engaging portion of the thin cylindrical sleeve is formed in the non-press-fitting region, the engaging portion of the thin cylindrical sleeve can be formed without affecting the fitting force of the thin cylindrical sleeve with respect to the shaft member. can be done. As a result, it is possible to improve the positional accuracy of welding while ensuring the fitting force of the thin cylindrical sleeve with respect to the shaft member.

The torque sensor of the present disclosure includes a shaft member that transmits rotational torque, a thin cylindrical sleeve that is formed in a substantially cylindrical shape and into which the shaft member is press-fitted, and a detection member that is arranged around the thin cylindrical sleeve. and a detection coil for detecting movement of the detection member in the circumferential direction about the shaft member, and the thin cylindrical sleeve is formed by bending a thin plate into a cylindrical shape so that the thin plates are butted in the circumferential direction of the cylinder. The thin-walled cylindrical sleeve is formed by welding a portion, and the thin-walled cylindrical sleeve is provided with the abutment portion at a position opposite to the axial center of the cylinder with respect to the joint range, which is the range in which the abutting portion is located in the circumferential direction. An engagement portion, which is a hole or a notch, is formed to engage with a protrusion formed on a holding jig that holds the thin cylindrical sleeve when the butt portion is welded.

According to this configuration, since the engaging portion that engages with the projecting portion of the holding jig is formed in the thin cylindrical sleeve, it is possible to suppress movement of the thin cylindrical sleeve during welding of the butted portion. can be properly welded. In addition, since the engaging portion of the thin cylindrical sleeve is formed at a position opposite to the bonding range across the axis of the thin cylindrical sleeve, when the thin cylindrical sleeve is held by a holding jig, the thin cylindrical sleeve Deviations in the target position for welding due to errors in diameter during manufacturing can be accommodated in the radial direction passing through the joining range and the engagement portion. Therefore, when joining the butted portions by welding, welding is performed in the radial direction of the thin cylindrical sleeve, so that even if there is an error in the diameter within the tolerance range when manufacturing the thin cylindrical sleeve, the welding target It is possible to suppress the positional deviation of the actual weld with respect to the position. As a result, the welding position accuracy can be improved.

The method of manufacturing a thin cylindrical sleeve and the torque sensor according to the present disclosure have the effect of improving the positional accuracy of welding.

FIG. 1 is a schematic diagram of a steering device according to an embodiment. FIG. 2 is a perspective view of a main portion of the steering device according to the embodiment. FIG. 3 is a perspective view of the torque sensor, stub shaft and pinion gear. 4 is a perspective view of a main part of the constituent members of the torque sensor shown in FIG. 3. FIG. FIG. 5 is an explanatory diagram showing a state where the input side rotor is attached to the stub shaft. 6 is a perspective view of a thin-walled cylindrical sleeve included in the input-side rotor shown in FIG. 5. FIG. 7 is a plan view of a thin plate used to manufacture the thin cylindrical sleeve shown in FIG. 6. FIG. FIG. 8 is a detailed view of part E in FIG. FIG. 9 is a perspective view of the thin-walled cylindrical sleeve viewed from the end opposite to the end on which the tapered portion is formed. FIG. 10 is a cross-sectional view of the thin cylindrical sleeve viewed in the axial direction at the position where the engaging portion is formed. FIG. 11 is a perspective view of a welding jig holding a thin cylindrical sleeve. FIG. 12 is a cross-sectional view of the welding jig and the thin cylindrical sleeve when the thin cylindrical sleeve is viewed in the axial direction at the position where the protrusion is formed. 13 is a plan view of the welding jig shown in FIG. 11. FIG. FIG. 14 is an explanatory diagram of a case where the engaging portion is formed at a position other than the opposite position of the joining range. FIG. 15 is an explanatory diagram of a case where the engaging portion is formed at a position opposite to the joining range. FIG. 16 is a modification of the method of manufacturing the thin cylindrical sleeve according to the embodiment, and is an explanatory view of the case where the protruding portion is formed in a conical shape. FIG. 17 is a modification of the method of manufacturing the thin cylindrical sleeve according to the embodiment, and is an explanatory diagram of a case where the protrusion is formed in the shape of a rectangular parallelepiped. FIG. 18 is a modification of the thin cylindrical sleeve manufacturing method according to the embodiment, and is an explanatory view showing a form in which the engaging portion of the thin cylindrical sleeve is a notch.

Hereinafter, the present disclosure will be described in detail with reference to the drawings. The present disclosure is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that fall within a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be combined as appropriate.

[Embodiment]
FIG. 1 is a schematic diagram of a steering device 80 according to an embodiment. As shown in FIG. 1, the steering device 80 includes a steering wheel 81, a steering shaft 82, a universal joint 84, a lower shaft 85, a universal joint 86, and a stub shaft in order of transmission of force given by the operator. 87 , a steering gear 88 and tie rods 89 . The steering device 80 also includes a control device (hereinafter referred to as an ECU (Electronic Control Unit)) 90 , a torque sensor 10 and an electric motor 92 . A vehicle speed sensor 91 is provided in the vehicle and outputs a vehicle speed signal V to the ECU 90 through CAN (Controller Area Network) communication.

The steering shaft 82 is connected at one end to the steering wheel 81 and at the other end to a universal joint 84 .

The lower shaft 85 is connected at one end to the universal joint 84 and at the other end to the universal joint 86 . The stub shaft 87 has one end connected to the universal joint 86 and the other end connected to the torque sensor 10 . The torque sensor 10 has one end connected to the stub shaft 87 and the other end connected to the pinion gear 88 a of the steering gear 88 .

Specifically, the stub shaft 87 and the pinion gear 88a are connected via a torsion bar (not shown). The torsion bar has one end connected to the stub shaft 87 and the other end connected to the pinion gear 88a, and the torsion bar transmits rotational torque between the stub shaft 87 and the pinion gear 88a. Torque sensor 10 detects rotational torque transmitted between stub shaft 87 and pinion gear 88a via a torsion bar.

The steering gear 88 includes a pinion gear 88a and a rack bar 88b. The pinion gear 88a is connected to the stub shaft 87 via a torsion bar. One end of the pinion gear 88a is connected to the torque sensor 10, and the driving force of the electric motor 92 can be transmitted from the other end. The rack bar 88b meshes with the pinion gear 88a. The steering gear 88 converts the rotary motion transmitted to the pinion gear 88a into linear motion by the rack bar 88b. The tie rod 89 is connected to the rack bar 88b. That is, the steering device 80 is of rack and pinion type.

FIG. 2 is a perspective view of essential parts in the steering device 80 according to the embodiment. The pinion gear 88a is arranged within a pinion housing 88s. The rack bar 88b is arranged within a rack housing 88h integrally formed with the pinion housing 88s. A motor attachment portion 88m for attaching an electric motor 92 is formed in the pinion housing 88s, and the electric motor 92 is attached to the motor attachment portion 88m. The driving force generated by the electric motor 92 can be transmitted to the pinion gear 88a within the pinion housing 88s. The torque sensor 10 is attached to the pinion housing 88s, and is connected to a stub shaft 87 and a pinion gear 88a arranged inside the pinion housing 88s.

The torque sensor 10 detects the driver's steering force transmitted to the steering shaft 82 via the steering wheel 81 as steering torque. The vehicle speed sensor 91 detects the traveling speed (vehicle speed) of the vehicle in which the steering device 80 is mounted. Electric motor 92 , torque sensor 10 and vehicle speed sensor 91 are electrically connected to ECU 90 .

The ECU 90 controls operation of the electric motor 92 . The ECU 90 also acquires signals from the torque sensor 10 and the vehicle speed sensor 91 respectively. That is, the ECU 90 acquires the steering torque T from the torque sensor 10 and acquires the vehicle speed signal V from the vehicle speed sensor 91 . The ECU 90 is supplied with electric power from a power supply device (for example, an in-vehicle battery) 99 when an ignition switch 98 is on. The ECU 90 calculates an assist steering command value of the assist command based on the steering torque T and the vehicle speed signal V. FIG. Then, the ECU 90 adjusts the electric power value X to be supplied to the electric motor 92 based on the calculated assist steering command value. The ECU 90 acquires, as operation information Y, information about the induced voltage from the electric motor 92 or information output from a rotation detecting device such as a resolver provided in the electric motor 92 .

The operator's (driver's) steering force inputted to the steering wheel 81 is detected by the torque sensor 10 as the steering torque T. FIG. The ECU 90 acquires the steering torque T from the torque sensor 10 and the vehicle speed signal V from the vehicle speed sensor 91 . The ECU 90 then controls the operation of the electric motor 92 . The driving force generated by the electric motor 92 is transmitted to the pinion gear 88a as auxiliary steering torque. That is, to the pinion gear 88 a , the operator's steering force input to the steering wheel 81 is transmitted from the stub shaft 87 via the torsion bar, and the auxiliary steering torque is transmitted from the electric motor 92 . Since the auxiliary steering torque is transmitted from the electric motor 92 to the pinion gear 88a, the force required to operate the steering wheel 81 is reduced.

The steering force transmitted to the pinion gear 88a is transmitted to the tie rod 89 via the steering gear 88 to displace the wheels.

FIG. 3 is a perspective view of the torque sensor 10, the stub shaft 87 and the pinion gear 88a. The stub shaft 87 and the pinion gear 88a connected to the torque sensor 10 are connected to the torque sensor 10 from opposite sides of the torque sensor 10 . That is, the stub shaft 87 and the pinion gear 88a are arranged on opposite sides of the torque sensor 10 and extend in opposite directions.

Among them, the pinion gear 88a is formed with a gear portion 88ag that meshes with teeth (not shown) formed on the rack bar 88b. The pinion gear 88a has a worm wheel (not shown) that meshes with a worm gear (not shown) attached to the output shaft of the electric motor 92 at the end opposite to the end connected to the torque sensor 10. Attached splines 88as are formed. As a result, the pinion gear 88a receives the auxiliary steering torque from the electric motor 92 via the worm gear and the worm wheel.

FIG. 4 is a perspective view of essential parts of the constituent members of the torque sensor 10 shown in FIG. The torque sensor 10 has an input-side rotor 20 attached to the input shaft, which is one of the shaft members connected to the torque sensor 10, and an output-side rotor 70, which is attached to the output shaft which is the other shaft member. , and a printed circuit board 15 on which the detection coil 16 is arranged. In this embodiment, the input shaft is a stub shaft 87 and the input side rotor 20 is attached to the stub shaft 87 . The output shaft is a pinion gear 88a, and the output side rotor 70 is attached to the pinion gear 88a.

The input-side rotor 20 has a thin cylindrical sleeve 30 formed in a substantially cylindrical shape, and vane-like members 65 that are arranged around the thin cylindrical sleeve 30 and serve as detection members. The thin cylindrical sleeve 30 is made of a metal material and has an inner diameter approximately equal to the outer diameter of the stub shaft 87 at the position where the input side rotor 20 is attached. Therefore, the input side rotor 20 is attached to the stub shaft 87 by press-fitting the stub shaft 87 into the thin cylindrical sleeve 30 .

The blade member 65 is a thin plate member made of a metal material, and is arranged around the thin cylindrical sleeve 30 so that the thickness direction of the plate corresponds to the axial direction of the thin cylindrical sleeve 30 . The vane-like member 65 has a plurality of vane pieces separated from each other in the circumferential direction of the thin cylindrical sleeve 30 and is formed by arranging the plurality of vane pieces around the thin cylindrical sleeve 30 . The thin cylindrical sleeve 30 and the blade-shaped member 65 are integrally formed by the resin mold 60 made of resin material. That is, the vane-like member 65 is arranged around the thin cylindrical sleeve 30 by the resin mold 60 .

The blade-shaped member 65 of the input-side rotor 20 is arranged near one end of the input-side rotor 20 in the axial direction of the thin cylindrical sleeve 30 . The input-side rotor 20 is attached to the stub shaft 87 so that the side on which the blade-shaped member 65 is arranged is the side on which the output-side rotor 70 is arranged.

The output-side rotor 70 has a substantially cylindrical sleeve portion 71 and blade-shaped members 72 that are arranged around the sleeve portion 71 and serve as detection members. The sleeve portion 71 is made of a metal material, and has an inner diameter approximately equal to the outer diameter of the pinion gear 88a at a position where the output-side rotor 70 is attached. Therefore, the output side rotor 70 is attached to the pinion gear 88 a by press-fitting the pinion gear 88 a into the sleeve portion 71 .

The blade-like member 72 is a thin plate-like member made of a metal material, and is arranged around the sleeve portion 71 so that the thickness direction of the plate corresponds to the axial direction of the sleeve portion 71 . The blade-like member 72 has a plurality of blade pieces that are separated from each other in the circumferential direction of the sleeve portion 71 and is formed by arranging the plurality of blade pieces around the sleeve portion 71 .

In the blade-shaped member 72 of the output-side rotor 70 and the blade-shaped member 65 of the input-side rotor 20, the size of each blade in the circumferential direction and the interval between the blades in the circumferential direction are different. different. In this embodiment, the blade members 72 of the output-side rotor 70 are larger in size in the circumferential direction than the blade-shaped members 65 of the input-side rotor 20. The spacing in the circumferential direction is also large. In the output-side rotor 70, unlike the input-side rotor 20, the sleeve portion 71 and the blade-shaped member 72 are integrally formed as one member made of a metal material.

The blade-shaped member 72 of the output-side rotor 70 is arranged near one end of the output-side rotor 70 in the axial direction of the sleeve portion 71 . The output-side rotor 70 is attached to the pinion gear 88a in such a direction that the side on which the blade-shaped member 72 is arranged is the side on which the input-side rotor 20 is arranged.

The printed circuit board 15 is arranged between the input side rotor 20 and the output side rotor 70 . On the printed circuit board 15, movement of the blade member 65 of the input side rotor 20 in the circumferential direction around the stub shaft 87 and movement of the blade member 65 of the output side rotor 70 in the circumferential direction around the pinion gear 88a are recorded. A detection coil 16 is arranged to detect movement of the member 72 . The detection coil 16 is arranged at a position facing the vane-shaped member 65 of the input side rotor 20 and the vane-shaped member 72 of the output side rotor 70 .

The detection coil 16 is configured such that its inductance changes when the relative position in the circumferential direction between the vane-like member 65 of the input-side rotor 20 and the vane-like member 72 of the output-side rotor 70 changes. ing. As a result, the torque sensor 10 detects a change in the inductance of the detection coil 16 to detect the relative relationship in the circumferential direction between the stub shaft 87 to which the input side rotor 20 is attached and the pinion gear 88a to which the output side rotor 70 is attached. angle change can be detected. Rotational torque is transmitted between the stub shaft 87 and the pinion gear 88a via the torsion bar, so the torque sensor 10 detects a relative angular change between the stub shaft 87 and the pinion gear 88a. Torque transmitted between the stub shaft 87 and the pinion gear 88a can be detected.

FIG. 5 is an explanatory diagram showing a state where the input side rotor 20 is attached to the stub shaft 87. As shown in FIG. The resin mold 60 of the input-side rotor 20 has a sleeve support portion 60 a that supports the thin cylindrical sleeve 30 and a blade-like member support portion 60 b that supports the blade-like member 65 . The sleeve support portion 60 a is arranged radially outward of the thin cylindrical sleeve 30 and has a support member extending along the outer peripheral surface of the thin cylindrical sleeve 30 in the axial direction of the thin cylindrical sleeve 30 . The sleeve support portion 60a has a plurality of support members, and the plurality of support members are arranged side by side in the circumferential direction.

The blade-shaped member supporting portion 60b is formed in the shape of a flange in the resin mold 60, and is formed over one circumference in the circumferential direction such that the thickness direction of the flange corresponds to the axial direction of the thin cylindrical sleeve 30. . The vane-shaped member 65 is attached to the vane-shaped member support portion 60b formed in this manner and is supported by the vane-shaped member support portion 60b.

In the input side rotor 20, the resin mold 60 is attached to the thin cylindrical sleeve 30 in such a positional relationship that the blade-shaped member supporting portion 60b is located near one end in the axial direction of the thin cylindrical sleeve 30. and the thin cylindrical sleeve 30 are integrally formed.

FIG. 6 is a perspective view of the thin cylindrical sleeve 30 included in the input rotor 20 shown in FIG. The thin cylindrical sleeve 30 is a metal member formed in a substantially cylindrical shape. The thin cylindrical sleeve 30 has a tapered portion 34 formed on the inner peripheral surface 33 at a position near one end 31 in the axial direction of the thin cylindrical sleeve 30 . A tapered portion 34 formed on an inner peripheral surface 33 of the thin cylindrical sleeve 30 is formed so as to taper in a direction in which the plate thickness becomes thinner toward the end portion 31 in the axial direction of the thin cylindrical sleeve 30 . Specifically, the input side rotor 20 is attached to the stub shaft 87 by press-fitting the stub shaft 87 into the thin cylindrical sleeve 30 . It is formed on the inner peripheral surface 33 of the thin cylindrical sleeve 30 on the side where the end portion 31 on the side to be press-fitted is located.

FIG. 7 is a plan view of a thin plate 38 used to manufacture the thin cylindrical sleeve 30 shown in FIG. The thin cylindrical sleeve 30 is formed by bending a thin plate 38 into a cylindrical shape. The thin plate 38 is formed in a belt-like shape, and the thin cylindrical sleeve 30 is formed by bending the thin plate 38 so that the longitudinal direction of the thin plate 38 becomes the circumferential direction of the cylinder.

The thin-walled cylindrical sleeves 30 are butted against each other in the circumferential direction at ends located on both sides in the length direction of the thin plate 38 as abutting portions 40 and welded at welding portions 50 . Therefore, in the thin cylindrical sleeve 30 formed in a substantially cylindrical shape, the abutting portion 40 of the thin plate 38 in the circumferential direction of the cylinder is formed extending in the axial direction of the cylinder. The welded portion 50 that welds the butted portion 40 is a welded portion 50 by laser welding in this embodiment, and the butted portion 40 is welded by a plurality of welded portions 50 .

Of the plurality of welded portions 50 that weld the butted portion 40 , the end welded portion 51 , which is the welded portion 50 located closest to the end portion 31 on the side where the tapered portion 34 is formed, is located at the axial center of the thin cylindrical sleeve 30 . At least a portion thereof overlaps with the tapered portion 34 in the direction.

The butted portion 40 is formed by combining a linear portion 41 extending in the axial direction of the cylinder, which is in the shape of the thin cylindrical sleeve 30, and a curved portion 42 curved in the circumferential direction of the cylinder with respect to the axial direction. there is Specifically, the abutting portion 40 located on one end side in the length direction of the thin plate 38 is a convex portion that is bent toward the side opposite to the side where the other end in the length direction is located by bending at the curved portion 42. 43. The convex portion 43 is formed to be convex in the length direction of the thin plate 38 and has a portion convex in the direction in which the width in the width direction of the thin plate 38 becomes larger than the base of the convex portion 43 . It is

On the other hand, the abutting portion 40 located on the other end side in the length direction of the thin plate 38 has a concave portion 44 that is recessed toward the side where the one end in the length direction is located by bending at the curved portion 42 . The recessed portion 44 is recessed in the length direction of the thin plate 38 and is recessed in the direction in which the width of the thin plate 38 in the width direction is larger than the position of the end of the thin plate 38 in the recessed portion 44 . It is formed with The convex portion 43 and the concave portion 44 formed in this manner are formed in substantially the same shape.

The convex portion 43 and the concave portion 44 are formed at the same position in the width direction of the thin plate 38 , that is, in the axial direction of the cylinder that is the shape of the thin cylindrical sleeve 30 . Thus, when the butted portions 40 are butted together to make the thin plate 38 cylindrical, the convex portion 43 formed in one butted portion 40 enters the concave portion 44 formed in the other butted portion 40. As a result, the abutting portions 40 are joined together.

At this time, the convex portion 43 has a portion that protrudes in the direction in which the width in the width direction of the thin plate 38 is larger than the base of the convex portion 43 , and the concave portion 44 is an end portion of the thin plate 38 in the concave portion 44 . There is a portion that is recessed in the direction in which the width in the width direction of the thin plate 38 is larger than the position of . Therefore, when the protrusion 43 enters the recess 44, the protrusion 43 cannot be removed from the recess 44 in the circumferential direction of the thin cylindrical sleeve 30, and the protrusion 43 and the recess 44 are combined. .

In the present embodiment, two convex portions 43 and two concave portions 44 are formed in such a manner. formed. The welded portions 50 joining the butted portions 40 are applied to a plurality of locations in a state in which the convex portions 43 enter the concave portions 44 and the butted portions 40 are butted against each other. The welded portion 50 is formed, for example, at a position where the convex portion 43 and the concave portion 44 are combined in the butted portion 40, or at positions on both sides of the convex portion 43 and the concave portion 44 in the axial direction of the thin cylindrical sleeve 30. .

FIG. 8 is a detailed view of part E in FIG. A butted portion 40 having a straight portion 41 and a curved portion 42 is formed by extending the straight portion 41 from the end portion 31 . Of the plurality of welded portions 50, the end welded portion 51, which is applied at a position at least partially overlapping with the tapered portion 34 formed on the inner peripheral surface 33 of the thin cylindrical sleeve 30, is the straight portion of the butted portion 40. 41 positions. In the butted portion 40 , a sub-welded portion 50 different from the end welded portion 51 is located at a position where the straight portion 41 extending from the end portion 31 and to which the end welded portion 51 is applied intersects with the curved portion 42 . A weld 52 is located. That is, on the linear portion 41 to which the end weld portion 51 is applied, the auxiliary weld portion 52 is applied at the position of the end portion of the straight portion 41 on the side connected to the curved portion 42 . In the butted portion 40 , the straight portion 41 extending from the end portion 31 on the side where the tapered portion 34 is formed on the inner peripheral surface 33 of the thin cylindrical sleeve 30 has the end weld portion 51 and the sub-weld portion 52 . Two welds 50 are applied.

FIG. 9 is a perspective view of the thin cylindrical sleeve 30 viewed from the end 31 opposite to the end 31 where the tapered portion 34 is formed. The thin cylindrical sleeve 30 is formed with an engaging portion 35 that engages with a protrusion 114 (see FIG. 11) formed on a holding jig 110 (see FIG. 11), which will be described later. The engaging portion 35 is formed by a hole passing through the plate forming the thin cylindrical sleeve 30 . The engaging portion 35 penetrates between the outer peripheral surface 32 and the non-press-fitting surface 33n in the thickness direction of the plate forming the thin-walled cylindrical sleeve 30. It is formed with an opening.

More specifically, the inner peripheral surface 33 of the thin cylindrical sleeve 30 is positioned closer to the end 31 opposite to the end 31 on the side where the tapered portion 34 is located than the center of the thin cylindrical sleeve 30 in the axial direction. , the inner diameter is slightly different. Specifically, in the inner peripheral surface 33 of the thin cylindrical sleeve 30, the press-fitting surface 33p, which is the inner peripheral surface 33 on the side where the tapered portion 34 is located, is the end portion 31 opposite to the side where the tapered portion 34 is located. The inner diameter is slightly smaller than the non-press-fitting surface 33n, which is the inner peripheral surface 33 on the side.

In the axial direction of the thin cylindrical sleeve 30 , the press-fitting surface 33 p is formed in a press-fitting region Ap (see FIG. 7 ) where the stub shaft 87 is press-fitted into the thin cylindrical sleeve 30 . A region in which the non-press-fitting surface 33n is formed in the axial direction of the thin cylindrical sleeve 30 is a non-press-fitting region An (see FIG. 7). That is, the non-press-fitting region An is a region other than the press-fitting region Ap in the axial direction of the thin cylindrical sleeve 30, and is a region in which the stub shaft 87 is not press-fitted when the thin cylindrical sleeve 30 is attached to the stub shaft 87. ing. An engaging portion 35 formed by a hole passing through a plate forming the thin cylindrical sleeve 30 is formed in the non-press-fitting region An of the press-fitting region Ap and the non-press-fitting region An of the thin cylindrical sleeve 30 .

FIG. 10 is a cross-sectional view of the thin cylindrical sleeve 30 viewed in the axial direction at the position where the engaging portion 35 is formed. The engaging portion 35 is located opposite to the joining range 45 in the circumferential direction of the thin cylindrical sleeve 30 across the axial center C of the cylinder in the radial direction of the thin cylindrical sleeve 30 with respect to the joining range 45 where the butting portion 40 is positioned. formed. In other words, the engaging portion 35 is formed at a position of about 180° around the axial center C of the thin cylindrical sleeve 30 with respect to the joining range 45 . Specifically, the joint range 45 is a range in the circumferential direction between the portion located on the one side and the portion located on the other side in the circumferential direction of the thin cylindrical sleeve 30 in the butted portion 40, The range extends between both ends 31 in the axial direction of the thin cylindrical sleeve 30 (see FIG. 9).

The engaging portion 35 is located on the side of the thin cylindrical sleeve 30 on which the joint range 45 is located in the radial direction of the thin cylindrical sleeve 30 with the cylindrical axis C being the shape of the thin cylindrical sleeve 30 interposed therebetween. It is formed at a position projected on the opposite side. In other words, the engaging portion 35 is located on the opposite side of the joint range 45 in the radial direction of the thin cylindrical sleeve 30 with respect to the axial center C of the thin cylindrical sleeve 30 . It is formed in a portion where the joint range 45 is projected in the direction in which the axis C is positioned at the center of the width of the range 45 .

It should be noted that the engaging portion 35 does not have to be formed entirely at the position where the joining range 45 is projected, and a part of the engaging portion 35 is located at the position where the joining range 45 is projected. may In this embodiment, the engaging portion 35 is formed so that the entire engaging portion 35 is positioned within a range obtained by projecting the joining range 45 .

A welding jig 100 is used to weld the butted portion 40 of the thin cylindrical sleeve 30 thus formed. Next, the welding jig 100 will be described. FIG. 11 is a perspective view of the welding jig 100 holding the thin cylindrical sleeve 30. FIG. FIG. 12 is a sectional view of the welding jig 100 and the thin cylindrical sleeve 30 when the thin cylindrical sleeve 30 is viewed in the axial direction at the position where the protrusion 114 is formed. In the following description, the upper side of the welding jig 100 when the welding jig 100 is arranged in a normal usage mode is also referred to as the upper side of the welding jig 100, and the lower side of the welding jig 100 is referred to as the upper side of the welding jig 100. is also described as the lower side.

The welding jig 100 has a holding jig 110 and a cover jig 120 . The holding jig 110 is a jig for holding when welding the butted portion 40 of the thin plate 38 bent into a cylindrical shape. The holding jig 110 has a holding surface 111 formed on the upper surface thereof to hold the thin cylindrical sleeve 30 . The holding surface 111 is formed in a substantially groove-like shape in which the width of the opening of the groove is larger than the width of the bottom of the groove. The holding surface 111 holds the thin cylindrical sleeve 30 in such a way that the axial direction of the thin cylindrical sleeve 30 is aligned with the lengthwise direction of the groove that is the shape of the holding surface 111 .

The holding surface 111 has a bottom surface 112 at a portion corresponding to the groove bottom of the groove, and a support surface 113 at a portion corresponding to the groove wall of the groove. That is, the support surfaces 113 are formed on both sides of the bottom surface 112 in the width direction. The support surfaces 113 formed on both sides of the bottom surface 112 are inclined with respect to the vertical direction and the horizontal direction in directions away from each other's support surfaces 113 as they go upward from the position of the bottom surface 112 . The support surface 113 is a surface that contacts the thin cylindrical sleeve 30 when the holding jig 110 holds the thin cylindrical sleeve 30 .

A protrusion 114 is formed on the bottom surface 112 . The protrusion 114 has a substantially cylindrical shape and is formed to protrude upward from the bottom surface 112 . The engaging portion 35 formed in a hole-like shape in the thin cylindrical sleeve 30 is slightly larger in diameter than the projection portion 114 formed in a substantially cylindrical shape, so that the projection portion 114 can be inserted thereinto. It is possible. The projecting portion 114 can engage with the thin cylindrical sleeve 30 by entering an engaging portion 35 formed on the thin cylindrical sleeve 30 .

The cover jig 120 is a jig that covers the thin cylindrical sleeve 30 from the side opposite to the side on which the holding jig 110 is positioned, while the thin cylindrical sleeve 30 is held by the holding jig 110 . ing. That is, the cover jig 120 is a jig that covers the thin cylindrical sleeve 30 from above the thin cylindrical sleeve 30 held by the holding jig 110 .

The cover jig 120 has an upper surface portion 121 , an inclined portion 122 and a side surface portion 123 . The upper surface portion 121 is formed in a plate-like shape and positioned at the upper end portion of the cover jig 120 in a state where the thin cylindrical sleeve 30 is covered with the cover jig 120 .

The inclined portions 122 are formed in a plate-like shape, and are arranged on both sides of the upper surface portion 121 in the horizontal direction perpendicular to the axial direction of the thin cylindrical sleeve 30 when the thin cylindrical sleeve 30 is covered with the cover jig 120 . there is When the thin cylindrical sleeve 30 is covered with the cover jig 120, the inclined portion 122 is inclined with respect to the vertical direction and the horizontal direction in a direction away from the other inclined portion 122 from the upper side to the lower side. .

The side surface portion 123 is formed in a plate-like shape and extends downward from the lower ends of the inclined portions 122 arranged on both sides of the upper surface portion 121 when the thin cylindrical sleeve 30 is covered with the cover jig 120 . there is That is, the side portions 123 are arranged on both sides of the upper surface portion 121 in the same manner as the inclined portion 122 . The interval between the side portions 123 arranged on both sides of the upper surface portion 121 is slightly larger than the width of the holding jig 110 in the horizontal direction orthogonal to the axial direction of the thin cylindrical sleeve 30 held by the holding jig 110. It has become. Therefore, when the thin cylindrical sleeve 30 is covered with the cover jig 120 , the holding jig 110 enters between the side portions 123 of the cover jig 120 .

The cover jig 120 has a holding surface 125 that holds the thin cylindrical sleeve 30 on the surface facing the thin cylindrical sleeve 30 when the cover jig 120 covers the thin cylindrical sleeve 30 held by the holding jig 110 . formed. The holding surface 125 has an upper surface 126 that is the surface of the upper surface portion 121 that faces the thin cylindrical sleeve 30 and a support surface 127 that is the surface of the inclined portion 122 that faces the thin cylindrical sleeve 30 .

Since the support surfaces 127 of the cover jig 120 are formed on the inclined portions 122 arranged on both sides of the upper surface portion 121 , the support surfaces 127 are formed on both sides of the upper surface 126 formed on the upper surface portion 121 . Similarly to the inclined portion 122, the support surface 127 of the cover jig 120 is arranged in a direction away from the other support surface 127 from the upper side to the lower side when the thin cylindrical sleeve 30 is covered with the cover jig 120. , with respect to the vertical and horizontal directions. The support surface 127 is a surface that contacts the thin cylindrical sleeve 30 when the cover jig 120 covers the thin cylindrical sleeve 30 held by the holding jig 110 .

FIG. 13 is a plan view of the welding jig 100 shown in FIG. 11. FIG. The upper surface portion 121 of the cover jig 120 is formed with a through hole 128 that penetrates the upper surface portion 121 in the thickness direction. That is, the through hole 128 penetrates the upper surface portion 121 of the cover jig 120 in the vertical direction when the cover jig 120 covers the thin cylindrical sleeve 30 held by the holding jig 110 . The through hole 128 is formed at a position corresponding to the welded portion 50 where the butted portion 40 formed on the thin cylindrical sleeve 30 held by the holding jig 110 is welded.

Specifically, the length of the through hole 128 formed in the upper surface portion 121 of the cover jig 120 in the axial direction of the thin cylindrical sleeve 30 held by the holding jig 110 is greater than the length of the thin cylindrical sleeve 30 in the same direction. It is also a long slotted hole. Further, the width of the elongated through hole 128 is larger than the width of the joining area 45 in the thin cylindrical sleeve 30 .

Next, a method for manufacturing the thin cylindrical sleeve 30 according to the embodiment will be described. When manufacturing the thin cylindrical sleeve 30, the thin plate 38 having the engaging portion 35 formed thereon is bent into a cylindrical shape so that the convex portion 43 and the concave portion 44 of the abutment portion 40 located at both ends in the length direction of the thin plate 38 are formed. combine. The thin cylindrical sleeve 30 is welded to the butted portion 40 of the cylindrical thin plate 38 using the welding jig 100 .

Specifically, after bending the thin plate 38 into a cylindrical shape and combining the projections 43 and the recesses 44 of the butted portion 40, the thin cylindrical sleeve 30 before welding of the butted portion 40 is attached to the welding jig while maintaining the cylindrical state. It is placed on the holding surface 111 of the holding jig 110 of the tool 100 . At this time, the thin cylindrical sleeve 30 is oriented such that the side on which the engaging portion 35 is located faces downward, and the projecting portion 114 extending upward from the bottom surface 112 of the holding jig 110 is inserted into the engaging portion 35. Let Thereby, the engaging portion 35 is engaged with the projection portion 114 of the holding jig 110 .

In the thin cylindrical sleeve 30, when the projection 114 is inserted into the engaging portion 35 and the engaging portion 35 is engaged with the projecting portion 114, the holding surface 111 is formed on both sides of the projecting portion 114 in the circumferential direction of the thin cylindrical sleeve 30. The thin-walled cylindrical sleeve 30 contacts the supporting surface 113 located there. As a result, the thin cylindrical sleeve 30 is held by the holding jig 110 in a state where the engaging portion 35 is engaged with the protrusion 114 and supported by the support surface 113 of the holding surface 111 .

Here, the engaging portion 35 of the thin cylindrical sleeve 30 is located at the axial center of the thin cylindrical sleeve 30 in the radial direction of the thin cylindrical sleeve 30 with respect to the joining range 45 (see FIG. 9) where the butted portion 40 is positioned. They are formed at opposite positions across C (see FIG. 10). Therefore, by orienting the side on which the engaging portion 35 is positioned downward, the engaging portion 35 is engaged with the protrusion 114 extending upward from the bottom surface 112 of the holding jig 110 . , the joining range 45 is located on the upper side of the thin cylindrical sleeve 30 . That is, the thin cylindrical sleeve 30 with the engaging portion 35 engaged with the projecting portion 114 is held by the holding jig 110 with the abutting portion 40 positioned upward in the vertical direction.

After the thin cylindrical sleeve 30 is held by the holding jig 110 , the cover jig 120 covers the thin cylindrical sleeve 30 with the butted portion 40 positioned on the upper side. The cover jig 120 covers the thin cylindrical sleeve 30 with the upper surface portion 121 having the through hole 128 positioned on the upper side and the holding surface 125 facing the thin cylindrical sleeve 30 . As a result, the cover jig 120 covers the thin cylindrical sleeve 30 in a state in which the through hole 128 faces the butted portion 40 of the thin cylindrical sleeve 30 , that is, in a state in which the through hole 128 opens to the butted portion 40 . will cover.

In this state, the support surfaces 127 located on both sides of the through hole 128 formed in the upper surface portion 121 in the circumferential direction of the thin cylindrical sleeve 30 facing the holding surface 125 of the cover jig 120 are aligned with the thin cylindrical sleeve 30 . 30. In the welding jig 100 in which the thin cylindrical sleeve 30 is covered with the cover jig 120, the supporting surface 113 of the holding jig 110 and the supporting surface 127 of the cover jig 120 are respectively attached to the thin cylindrical sleeve 30. It contacts and supports the thin-walled cylindrical sleeve 30 . In other words, the welding jig 100 is configured such that the two support surfaces 113 of the holding jig 110 and the two support surfaces 127 of the cover jig 120 contact the thin cylindrical sleeve 30, respectively. The thin cylindrical sleeve 30 is supported and fixed at four points in the circumferential direction of the sleeve 30 .

After fixing the thin cylindrical sleeve 30 by the welding jig 100 and holding the thin cylindrical sleeve 30, the butt portion 40 is welded. The butted portion 40 is welded while the thin cylindrical sleeve 30 is held by the welding jig 100 . Welding of the butted portion 40 is performed through the through hole 128 of the cover jig 120 that covers the thin cylindrical sleeve 30 from above.

That is, when the thin cylindrical sleeve 30 is held by the welding jig 100, the through hole 128 of the cover jig 120 is open to the abutment portion 40 of the thin cylindrical sleeve 30. Welding is performed from the through hole 128 of the jig 120 to the butted portion 40 of the thin cylindrical sleeve 30 . In this embodiment, the abutting portion 40 is welded at a plurality of welding portions 50 (see FIG. 6) by laser welding from the through hole 128 of the cover jig 120 . Thereby, the substantially cylindrical thin-walled cylindrical sleeve 30 is manufactured.

After manufacturing the thin cylindrical sleeve 30, the thin cylindrical sleeve 30 is removed from the welding jig 100, and the thin cylindrical sleeve 30 and the blade-like member 65 manufactured in a separate process are integrally formed by the resin mold 60. . That is, injection molding of the resin mold 60 is performed in a state in which the thin cylindrical sleeve 30 and the blade-shaped member 65 are aligned. Thereby, the input side rotor 20 is manufactured. At this time, since the engaging portion 35 is formed in the thin cylindrical sleeve 30, when the resin mold 60 is formed, the resin enters the engaging portion 35 of the thin cylindrical sleeve 30, causing the thin cylindrical sleeve 30 to be displaced. and the resin mold 60 are prevented from rotating with each other. The input-side rotor 20 is attached to the stub shaft 87 by press-fitting the stub shaft 87 into the thin-walled cylindrical sleeve 30 of the input-side rotor 20 manufactured in this manner.

The stub shaft 87 is press-fitted into the thin cylindrical sleeve 30 from the end portion 31 side of the thin cylindrical sleeve 30 where the tapered portion 34 is formed on the inner peripheral surface 33 . By inserting the stub shaft 87 into the inner peripheral surface 33 of the thin cylindrical sleeve 30 on which the tapered portion 34 is formed, the stub shaft 87 can be easily inserted. Therefore, the stub shaft 87 can be easily press-fitted into the thin cylindrical sleeve 30 . When press-fitting the thin cylindrical sleeve 30 onto the stub shaft 87, the stub shaft 87 may be inserted into the fixed thin cylindrical sleeve 30, or the thin cylindrical sleeve 30 may be inserted into the fixed stub shaft 87. You can fit them together.

In the method of manufacturing the thin cylindrical sleeve 30 according to the embodiment described above, the projecting portion 114 is formed on the holding jig 110 that holds the thin cylindrical sleeve 30 for welding the butted portion 40 , and the engaging portion 35 is formed on the thin cylindrical sleeve 30 . is formed, and the engaging portion 35 of the thin cylindrical sleeve 30 is engaged with the projecting portion 114 of the holding jig 110 to weld the butted portion 40 . As a result, when welding the butted portion 40, the thin cylindrical sleeve 30 can be prevented from moving, and the thin cylindrical sleeve 30 can be fixed, so that the butted portion 40 can be properly welded. .

In addition, the engaging portion 35 of the thin cylindrical sleeve 30 is positioned in the radial direction of the thin cylindrical sleeve 30 with respect to the joining range 45 in which the butted portion 40 is positioned. It is formed at the opposite position with C interposed therebetween. As a result, the butted portion 40 can be welded at an appropriate position regardless of the diameter error of the thin cylindrical sleeve 30 .

14A and 14B are explanatory diagrams of a case where the engaging portion 35 is formed at a position other than the position opposite to the joining range 45. FIG. FIG. 14 shows that the protrusion 114 of the holding jig 110 is formed on the support surface 113 in a direction that is inclined with respect to the vertical direction, and the engaging portion 35 of the thin cylindrical sleeve 30 corresponds to the position of the protrusion 114. 10 is a schematic diagram showing a state in which the joint area 45 is formed at a position other than the opposite position across the axis C (see FIG. 10) of the thin cylindrical sleeve 30. FIG. Even if the protrusion 114 of the holding jig 110 is formed on the support surface 113 , by forming the engaging portion 35 on the thin cylindrical sleeve 30 at a position corresponding to the protrusion 114 , the holding jig 110 can hold the thin cylindrical sleeve. By engaging the engaging portion 35 with the projecting portion 114 when holding the sleeve 30, it is possible to suppress the movement of the thin cylindrical sleeve 30 during welding.

Here, the thin cylindrical sleeve 30 may have a slightly different diameter from the target diameter due to manufacturing tolerances. In this case, the position of the welded portion 50 may deviate from the target position due to the error. That is, when the thin cylindrical sleeve 30 is held by the holding jig 110 by engaging the engaging portion 35 with the protrusion 114 of the holding jig 110, the thin cylindrical sleeve 30 is held on the holding surface 111 of the holding jig 110 by: They are arranged with reference to the portion where the protrusion 114 is formed.

For this reason, the protrusion 114 of the holding jig 110 is arranged on the support surface 113 of the holding surface 111, and the engaging portion 35 of the thin cylindrical sleeve 30 sandwiches the axial center C of the thin cylindrical sleeve 30 with respect to the joining range 45. Even if it is formed at a position other than the opposite position, the thin cylindrical sleeve 30 is arranged on the holding surface 111 with reference to the position of the engaging portion 35 that engages with the protrusion 114 .

That is, the thin-walled cylindrical sleeve 30 has a standard diameter sleeve 30nom whose diameter is the standard diameter, a maximum diameter sleeve 30max whose diameter is the maximum diameter within the tolerance, and a minimum diameter sleeve 30min whose diameter is the minimum diameter within the tolerance. are arranged on the holding surface 111 of the holding jig 110 with the position of the engaging portion 35 as a reference. A welding target position 50a, which is a target position for welding the butted portion 40, is defined for each of the standard diameter sleeve 30nom, maximum diameter sleeve 30max, and minimum diameter sleeve 30min.

In addition, each of these thin cylindrical sleeves 30 is formed at a position other than the opposite position across the axis C of the thin cylindrical sleeve 30 in the radial direction of the thin cylindrical sleeve 30 with respect to the joining range 45. It is arranged on the holding jig 110 with the position of the joining portion 35 as a reference. For this reason, with the standard diameter sleeve 30nom, the maximum diameter sleeve 30max, and the minimum diameter sleeve 30min, which have different diameters, the welding target position 50a is perpendicular to the axial direction of the thin cylindrical sleeve 30 as shown in FIG. The positions in the horizontal direction are different from each other.

On the other hand, the laser welding position for the thin cylindrical sleeve 30 held by the holding jig 110 is set at a fixed position regardless of the difference in size of the thin cylindrical sleeve 30 due to tolerance. The laser welding position in the horizontal direction orthogonal to the axial direction of the thin cylindrical sleeve 30 is determined based on the welding target position 50a of the standard diameter sleeve 30nom whose diameter is the standard diameter. Therefore, with the standard diameter sleeve 30nom, the actual position of the welded portion 50 is the same as the welding target position 50a, but with the maximum diameter sleeve 30max and the minimum diameter sleeve 30min, the actual position of the welded portion 50 is as shown in FIG. , the position is deviated from the welding target position 50a.

As a result, when the engaging portion 35 of the thin cylindrical sleeve 30 is formed at a position other than the position opposite to the joining range 45 across the axis C of the thin cylindrical sleeve 30, the diameter of the thin cylindrical sleeve 30 is increased. Depending on the size, the actual welding position may deviate from the target position.

FIG. 15 is an explanatory diagram of a case where the engaging portion 35 is formed at a position opposite to the joining range 45. FIG. In this embodiment, the engaging portion 35 of the thin cylindrical sleeve 30 is formed at a position opposite to the joining range 45 across the axis C of the thin cylindrical sleeve 30 in the radial direction of the thin cylindrical sleeve 30. . For this reason, the thin cylindrical sleeve 30 is arranged on the holding jig 110 with reference to the engaging portion 35 formed at the opposite position across the axis C of the thin cylindrical sleeve 30 from the joining range 45 .

In this case, when the diameter of the thin cylindrical sleeve 30 slightly deviates from the target diameter within the range of manufacturing tolerances, the position of the joining area 45 is changed to the target diameter. It does not move in the horizontal direction with respect to the position of the joint range 45, but moves in the vertical direction. That is, the maximum diameter sleeve 30max and the minimum diameter sleeve 30min have the same welding target position 50a in the horizontal direction as the welding target position 50a of the standard diameter sleeve 30nom. are in different positions.

Therefore, when welding is performed at the welding position determined based on the welding target position 50a of the standard diameter sleeve 30nom, even with the maximum diameter sleeve 30max and the minimum diameter sleeve 30min, the actual position of the welded portion 50 is different from each welding position. The position coincides with the target position 50a. As a result, even if there is a manufacturing error in the diameter of the thin cylindrical sleeve 30, welding can be performed at the welding target position 50a regardless of the size of the error relative to the standard diameter. That is, since the engaging portion 35 formed in the thin cylindrical sleeve 30 is formed in a position opposite to the joining range 45 in the radial direction across the axis C of the thin cylindrical sleeve 30, the thin cylindrical sleeve 30 is manufactured. The butt 40 can be welded at the proper position regardless of the diameter error over time. As a result, the welding position accuracy can be improved.

In addition, the thin cylindrical sleeve 30 held by the holding jig 110 is covered with the cover jig 120, and welding of the butted portion 40 of the thin cylindrical sleeve 30 is performed through the through hole 128 formed in the cover jig 120. Welding can be performed while the sleeve 30 is supported from both sides in the vertical direction by the holding jig 110 and the cover jig 120 . As a result, when the thin plate 38 is bent into a cylindrical shape and held by the welding jig 100 for welding, the thin cylindrical sleeve 30 before welding can be held more reliably. It is possible to suppress displacement of the welding position due to positional displacement. As a result, the welding position accuracy can be improved.

Further, when holding the thin cylindrical sleeve 30 with the holding jig 110 and the cover jig 120, the supporting surfaces 113 formed on both sides of the protrusions 114 of the holding jig 110 and the through holes in the cover jig 120 Support surfaces 127 formed on both sides of 128 are brought into contact with the thin cylindrical sleeve 30 to support the thin cylindrical sleeve 30 . As a result, the thin cylindrical sleeve 30 before welding can be fixed and held by the holding jig 110 and the cover jig 120, thereby suppressing displacement of the welding position due to displacement of the thin cylindrical sleeve 30. can do. As a result, the welding position accuracy can be improved.

In addition, since the engaging portion 35 of the thin cylindrical sleeve 30 is formed in the non-press-fit region An of the thin cylindrical sleeve 30, the thin cylindrical sleeve 30 can be fitted without affecting the fitting force of the thin cylindrical sleeve 30 with respect to the stub shaft 87, which is a shaft member. The engaging portion 35 of the cylindrical sleeve 30 can be formed. As a result, it is possible to improve the positional accuracy of welding while ensuring the fitting force of the thin cylindrical sleeve 30 with respect to the stub shaft 87 .

Further, since the protrusion 114 formed on the holding jig 110 is formed to protrude upward from the bottom surface 112 of the holding surface 111, when the thin cylindrical sleeve 30 is held by the holding jig 110, the holding The engaging portion 35 can be engaged with the projecting portion 114 while the thin cylindrical sleeve 30 is placed on the surface 111 from above. As a result, when holding the thin cylindrical sleeve 30 with the holding jig 110 , it is possible to hold the thin cylindrical sleeve 30 without re-engaging the engaging portion 35 of the thin cylindrical sleeve 30 with the projection 114 of the holding jig 110 . During the operation of placing the thin cylindrical sleeve 30 on the surface 111 , the engaging portion 35 can be engaged with the protrusion 114 . As a result, it is possible to improve workability when joining the butted portions 40 by welding.

Further, the torque sensor 10 according to the embodiment is configured such that the axial center C of the thin cylindrical sleeve 30 is sandwiched with respect to the joint range 45 in the thin cylindrical sleeve 30 into which the stub shaft 87, which is a shaft member that transmits rotational torque, is press-fitted. An engaging portion 35 that engages with the protrusion 114 of the holding jig 110 is formed at the opposite position. As a result, when the thin cylindrical sleeve 30 is held by the holding jig 110 when the butted portion 40 of the thin cylindrical sleeve 30 is welded, the welding target position 50a due to the diameter error in manufacturing the thin cylindrical sleeve 30 is The deviation can be accommodated in the radial direction passing through the joining range 45 and the engaging portion 35 in the thin cylindrical sleeve 30 . Therefore, when joining the butted portion 40 by welding, welding is performed in the radial direction of the thin cylindrical sleeve 30 to the butted portion 40, so that the diameter of the thin cylindrical sleeve 30 can be reduced within the tolerance range when manufacturing the thin cylindrical sleeve 30. Even if an error occurs, it is possible to suppress the positional deviation of the actual welded portion 50 with respect to the welding target position 50a. As a result, the welding position accuracy can be improved.

[Modification]
In the above-described embodiment, the protrusion 114 formed on the holding jig 110 is formed in a substantially columnar shape, but the protrusion 114 may be formed in a shape other than a columnar shape. . FIG. 16 is a modification of the method of manufacturing the thin-walled cylindrical sleeve 30 according to the embodiment, and is an explanatory view of the case where the projecting portion 114 is formed in a conical shape. For example, as shown in FIG. 16, the projecting portion 114 may be formed in a substantially conical shape whose diameter decreases from bottom to top. Since the projection 114 is formed in a conical shape, when the projection 114 is inserted into the engaging portion 35 of the thin cylindrical sleeve 30 and the engaging portion 35 is engaged with the projection 114, the projection 114 is It can be made to enter the engaging portion 35 from a position where the diameter at 114 is small. As a result, the projection 114 can be easily inserted into the engaging portion 35 , and the engaging portion 35 can be easily engaged with the projection 114 . As a result, it is possible to improve workability when joining the butted portions 40 by welding.

FIG. 17 is a modification of the method for manufacturing the thin cylindrical sleeve 30 according to the embodiment, and is an explanatory view of the case where the projecting portion 114 is formed in the shape of a rectangular parallelepiped. 17, for example, the projection 114 is formed in a substantially rectangular parallelepiped shape, and the engaging portion 35 of the thin cylindrical sleeve 30 is formed by a rectangular hole corresponding to the shape of the projection 114. may be As a result, when the projecting portion 114 of the holding jig 110 is inserted into the engaging portion 35 of the thin cylindrical sleeve 30, the direction of rotation of the thin cylindrical sleeve 30 about the vertical direction with respect to the holding jig 110 is , can be placed in an appropriate orientation with respect to the holding jig 110 . Therefore, by arranging the thin cylindrical sleeve 30 on the holding surface 111 by engaging the engaging portion 35 with the projecting portion 114 of the holding jig 110 , the thin cylindrical sleeve 30 can be welded to the butted portion using the welding jig 100 . 40 can be placed in the proper position to perform the weld. As a result, it is possible to improve workability when joining the butted portions 40 by welding.

FIG. 18 is a modified example of the manufacturing method of the thin cylindrical sleeve 30 according to the embodiment, and is an explanatory diagram showing a configuration in which the engaging portion 35 of the thin cylindrical sleeve 30 is a notch. The engaging portion 35 formed in the thin cylindrical sleeve 30 may be formed by a notch as shown in FIG. 18, for example. Specifically, the engaging portion 35 may be formed by a notch that is formed at the end 31 of the thin cylindrical sleeve 30 on the side where the non-press-fitting surface 33n is located and that opens at the position of the end 31 . By forming the engaging portion 35 with a notch in this way, it is possible to form the engaging portion 35 more easily than in the case where the engaging portion 35 is formed with a hole. Therefore, the thin cylindrical sleeve 30 can be easily provided with the engaging portion 35 that engages with the protrusion 114 of the holding jig 110, and the configuration for fixing the thin cylindrical sleeve 30 during welding of the butted portion 40 can be easily realized. can be realized.

In addition, in the embodiment described above, laser welding is used to weld the butted portion 40 after bending the thin plate 38 into a cylindrical shape. good. Welding of the butted portion 40 may be performed by, for example, arc welding or electron beam welding. That is, the welded portion 50, which is the portion where the butted portion 40 is welded, may be the welded portion 50 by arc welding or electron beam welding.

Further, in the above-described embodiment, the torque sensor 10 is connected to the stub shaft 87 and the pinion gear 88a, but the shaft member to which the torque sensor 10 is connected is other than the stub shaft 87 and the pinion gear 88a. good too. The torque sensor 10 may, for example, be connected to the steering shaft 82 and detect torque acting on the steering shaft 82 .

Although preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to those described in the above embodiments. The configurations described as the embodiments and modifications may be combined as appropriate.

REFERENCE SIGNS LIST 10 torque sensor 15 printed circuit board 16 detection coil 20 input side rotor 30 thin cylindrical sleeve 31 end portion 32 outer peripheral surface 33 inner peripheral surface 33p press-fit surface 33n non-press-fit surface 34 tapered portion 35 engaging portion 38 thin plate 40 butted portion 41 linear portion 42 Curved portion 45 Joint range 50 Welded portion 60 Resin mold 65 Blade-like member 70 Output side rotor 80 Steering device 81 Steering wheel 82 Steering shaft 87 Stub shaft 88 Steering gear 88a Pinion gear 88ag Gear portion 88b Rack bar 89 Tie rod 90 ECU
91 vehicle speed sensor 92 electric motor 98 ignition switch 99 power supply device 100 welding jig 110 holding jig 111 holding surface 112 bottom surface 113 support surface 114 projection 120 cover jig 121 upper surface portion 122 inclined portion 123 side surface portion 125 holding surface 126 upper surface 127 support surface 128 through hole

Claims (5)

A method for manufacturing a thin cylindrical sleeve, in which a thin plate is bent into a cylindrical shape and held by a holding jig, and butted portions of the thin plate in the circumferential direction of the cylinder are welded,
The holding jig is formed with a projection that engages with the thin cylindrical sleeve,
The thin-walled cylindrical sleeve is engaged with the projecting portion of the holding jig at a position opposite to the joint range, which is the range in which the butted portion is positioned in the circumferential direction, across the axis of the cylinder. Forming an engaging portion consisting of a hole or a notch,
In the thin cylindrical sleeve, the engaging portion of the thin cylindrical sleeve before welding of the butted portion is engaged with the protrusion of the holding jig, and is held by the holding jig to weld the butted portion. A method for manufacturing a thin-walled cylindrical sleeve. A through-hole is formed at a position corresponding to the welded portion of the abutting portion from the side opposite to the side where the holding jig is positioned with respect to the thin-walled cylindrical sleeve in a state where the holding jig holds the thin-walled cylindrical sleeve. covering the thin cylindrical sleeve with a cover jig,
2. The method of manufacturing a thin-walled cylindrical sleeve according to claim 1, wherein the butted portion is welded from the through hole of the cover jig. The holding jig is formed with supporting surfaces on both sides of the protrusion in the circumferential direction, the supporting surfaces coming into contact with the thin cylindrical sleeve,
The cover jig is formed with support surfaces on both sides of the through hole in the circumferential direction, the supporting surfaces coming into contact with the thin cylindrical sleeve,
3. The thin-walled part according to claim 2, wherein the supporting surface of the holding jig and the supporting surface of the cover jig are brought into contact with the thin-walled cylindrical sleeve to support the thin-walled cylindrical sleeve, and the butted portions are welded. A method for manufacturing a cylindrical sleeve. 4. The engaging portion of the thin cylindrical sleeve is formed in a non-press-fitting region other than a press-fitting region in which a shaft member for attaching the thin cylindrical sleeve is press-fitted into the thin cylindrical sleeve. A method for manufacturing a thin cylindrical sleeve according to any one of Claims 1 to 3. a shaft member that transmits rotational torque;
a thin cylindrical sleeve formed in a substantially cylindrical shape and into which the shaft member is press-fitted;
a detection member arranged around the thin cylindrical sleeve;
a detection coil for detecting movement of the detection member in a circumferential direction about the shaft member;
with
The thin cylindrical sleeve is formed by bending a thin plate into a cylindrical shape and welding the butted portions of the thin plate in the circumferential direction of the cylinder,
In the thin cylindrical sleeve, the thin-walled cylindrical sleeve is provided at a position opposite to the joining range, which is the range in which the butt-jointed portion is located in the circumferential direction, across the axis of the cylinder. A torque sensor having an engaging portion formed of a hole or a notch that engages with a projection formed on a holding jig that holds a cylindrical sleeve.

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