WO2024057605A1

WO2024057605A1 - Motor rotor, motor, and supercharger

Info

Publication number: WO2024057605A1
Application number: PCT/JP2023/016138
Authority: WO
Inventors: 誠司好村; 祐一大東
Original assignee: 株式会社Ihi
Priority date: 2022-09-12
Filing date: 2023-04-24
Publication date: 2024-03-21

Abstract

This motor rotor includes: a magnet including a magnet circumferential surface, a first magnet end surface, and a second magnet end surface; a C shaft including a C shaft end surface abutting against the first magnet end surface; and an armoring covering the magnet circumferential surface and a portion of the first magnet end surface that contacts the C shaft end surface. The C shaft includes: a C shaft insertion portion covered by the armoring; a C shaft protruding portion not covered by the armoring; and a C shaft coupling portion positioned between the C shaft insertion portion and the C shaft protruding portion and contacting an end of the armoring. The end of the armoring includes a ring-shaped fastening portion bent in such a manner as to approach a rotation axis of the C shaft.

Description

Motor rotor, motor and supercharger

The present disclosure relates to a motor rotor, a motor, and a supercharger.

Patent Document 1 discloses a technology related to a rotor used in a brushless motor. In the rotor disclosed in Patent Document 1, a permanent magnet is fixed to the rotating shaft using a cover. The structure disclosed in Patent Document 1 can fix the permanent magnet to the rotating shaft with a uniform fixed load. The structure disclosed in Patent Document 1 can prevent damage to the permanent magnet even when used in an environment where heat fluctuates.

Japanese Patent Application Publication No. 2006-87276

Like the rotor of Patent Document 1, the rotor is composed of several parts including a shaft and a magnet. The materials of the plurality of parts constituting the rotor are different from each other. Different materials result in different coefficients of thermal expansion. The degree of thermal deformation that occurs when the rotor receives heat varies from component to component. The environment in which the rotor is used varies in temperature over a wide range. When the rotor is exposed to temperature cycles that alternate between high-temperature and low-temperature environments, the components repeatedly expand and contract to varying degrees. As a result, the positional relationship between the parts may shift. A rotor exposed to temperature cycling gradually approaches a state in which it is unable to exhibit desired performance.

The present disclosure describes a motor rotor that can continue to maintain desired performance, a motor equipped with the motor rotor, and a supercharger equipped with the motor.

A motor rotor according to an embodiment of the present disclosure includes a magnet including a magnet circumferential surface and a pair of magnet end faces, a shaft unit including a shaft end face that contacts the magnet end face, a portion where the magnet end face is in contact with the shaft end face, and a magnet including a magnet circumferential surface and a pair of magnet end faces. A circumferential surface and an armor ring covering the circumferential surface. The shaft unit includes an insertion part covered by an armor ring, a protrusion part not covered by the armor ring, and a connecting part located between the insertion part and the protrusion part and in contact with an end of the armor ring. The end portion of the armor ring includes a caulked portion bent toward the axis of the shaft unit.

The motor rotor has a caulked portion provided at the end of the armor ring. The caulked portion is bent so as to approach the axis of the shaft unit. Therefore, it is possible to exert a force that presses the shaft unit toward the magnet. As a result, the direction of movement of the shaft unit that occurs during thermal contraction can be determined to move closer to the magnet. According to such a configuration, even if thermal expansion and contraction are repeated, the relative positional relationship between the shaft unit and the magnet can be maintained. Therefore, the motor rotor can continue to maintain desired performance.

According to the present disclosure, a motor rotor that can continue to maintain desired performance, a motor equipped with the motor rotor, and a supercharger equipped with the motor will be described.

FIG. 1 is a sectional view of a supercharger equipped with a motor including a motor rotor according to a first embodiment. FIG. 2(a) is a cross-sectional view of the motor rotor shown in FIG. FIG. 2(b) is an enlarged cross-sectional view of the main part of FIG. 2(a). FIG. 3(a) is a sectional view of a motor rotor that is a first modification of the first embodiment. FIG. 3(b) is a sectional view of a motor rotor that is a second modification of the first embodiment. FIG. 4(a) is a sectional view of the motor rotor of the second embodiment. FIG. 4(b) is a cross-sectional view of the motor rotor taken along line IV-IV in FIG. 4(a). FIG. 5(a) is a sectional view of a motor rotor that is a modification of the second embodiment. FIG. 5(b) is a cross-sectional view of the motor rotor taken along the line V-V in FIG. 5(a). FIG. 6 is a sectional view showing an enlarged main part of a motor rotor according to a third embodiment. FIG. 7(a) is a cross-sectional view of main parts in the process of forming the double crimped structure. FIG. 7(b) is a sectional view of the main part in the step of forming the double crimped structure following FIG. 7(a). FIG. 7(c) is a sectional view of the main part in the step of forming the double crimped structure following FIG. 7(b). FIG. 7(d) is a sectional view of the main part in the step of forming the double crimped structure following FIG. 7(c).

The present disclosure includes the following configurations.

A motor rotor according to an embodiment of the present disclosure includes a magnet including a magnet circumferential surface and a pair of magnet end faces, a shaft unit including a shaft end face that contacts the magnet end face, a portion where the magnet end face is in contact with the shaft end face, and a magnet including a magnet circumferential surface and a pair of magnet end faces. A circumferential surface and an armor ring covering the circumferential surface. The shaft unit includes an insertion portion covered by an armor ring, a protrusion portion not covered by the armor ring, and a connecting portion located between the insertion portion and the protrusion portion and in contact with an end of the armor ring. The end portion of the armor ring includes a caulked portion bent toward the axis of the shaft unit.

The connecting portion of the motor rotor may include a tapered surface that contacts the caulking portion. According to this configuration, it is possible to both allow thermal expansion of the shaft unit and determine the movement direction when the shaft unit thermally contracts.

The armor ring of the motor rotor includes a first housing part in which the magnet is housed, a second housing part in which the insertion part is disposed, and a third housing part in which the coupling part is disposed and includes a ring contact surface. But that's fine. The connecting portion may include a shaft abutting surface that abuts the ring abutting surface along the axial direction of the shaft unit. According to this configuration, the insertion depth of the shaft unit into the armor ring can be determined.

The connecting portion of the motor rotor may be sandwiched between the caulking portion and the ring contact surface. According to this configuration, it is possible to both determine the insertion depth of the shaft unit into the armor ring and determine the moving direction when the shaft unit is thermally contracted.

The outer diameter of the shaft abutting surface of the motor rotor may be larger than the outer diameter of the insertion portion. According to this configuration, the shaft unit can be reliably brought into contact with the armor ring.

The shaft end face of the motor rotor may be the end face of the insertion portion. The first shaft end surface of the first shaft unit may face the first magnet end surface. The second magnet end surface opposite to the first magnet end surface may face the second shaft end surface of the second shaft unit. According to this configuration, a solid magnet can be used.

The magnet of the motor rotor may include a magnet through hole that penetrates from the first magnet end surface to the second magnet end surface on the opposite side to the first magnet end surface. The shaft unit may include a shaft member including a protrusion and a portion inserted into the magnet through hole, and a sleeve member including a connecting portion. According to this configuration, a hollow magnet can be used.

The motor rotor connection portion may include a shaft groove. The caulking portion may include a neck portion including a portion in contact with the connecting portion, and a head portion including a portion bent with respect to the neck portion and disposed in the shaft groove. The head may include a surface that abuts a surface forming the shaft groove. According to this configuration, the caulked portion of the armor ring can be reliably hooked onto the shaft unit.

A motor according to another embodiment of the present disclosure includes a motor rotor and a motor stator including a coil disposed around the motor rotor. The motor rotor covers a magnet including a circumferential magnet surface and a pair of magnet end surfaces, a shaft unit including a shaft end surface that contacts the magnet end surface, a portion where the magnet end surface contacts the shaft end surface, and the magnet circumferential surface. Including armoring. The shaft unit includes an insertion part covered by an armor ring, a protrusion part not covered by the armor ring, and a connecting part located between the insertion part and the protrusion part and in contact with an end of the armor ring. The end portion of the armor ring includes a caulked portion bent toward the axis of the shaft unit. This motor includes the motor rotor described above. Therefore, this motor can also continue to maintain desired performance.

A supercharger according to yet another embodiment of the present disclosure includes a motor and an impeller rotated by the motor. The motor includes a motor rotor and a motor stator including a coil disposed around the motor rotor. The motor rotor covers a magnet including a circumferential magnet surface and a pair of magnet end surfaces, a shaft unit including a shaft end surface that contacts the magnet end surface, a portion where the magnet end surface contacts the shaft end surface, and the magnet circumferential surface. Including armoring. The shaft unit includes an insertion portion covered by an armor ring, a protrusion portion not covered by the armor ring, and a connecting portion located between the insertion portion and the protrusion portion and in contact with an end of the armor ring. The end portion of the armor ring includes a caulked portion bent toward the axis of the shaft unit. This supercharger includes the above motor rotor. Therefore, this supercharger can also continue to maintain desired performance.

Hereinafter, embodiments of a motor rotor, a motor, and a supercharger according to one aspect of the present disclosure will be described in detail with reference to the drawings. In each figure, the same parts are given the same reference numerals, and redundant explanations will be omitted.

<First embodiment>
FIG. 1 is a sectional view of a supercharger 9 including a motor rotor 1 according to a first embodiment of the present disclosure. The supercharger 9 is a vehicle supercharger including a motor rotor 1. In the following description, when we simply say "axial direction", "radial direction" and "circumferential direction", we mean the axial direction, radial direction and circumferential direction of the T-shaft 4, which will be described later.

As shown in FIG. 1, the supercharger 9 is an electric supercharger. The supercharger 9 is applied to, for example, an internal combustion engine of a ship or a vehicle. The supercharger 9 includes a turbine 91, a compressor 92, and a motor 8. The supercharger 9 is required to generate compressed air in a predetermined state. To generate compressed air, the rotating body 8R needs to have a predetermined torque. This torque is generated due to exhaust gas from the internal combustion engine. However, the torque generated due to the exhaust gas of the internal combustion engine may be less than the torque required to generate compressed air in a predetermined state. Therefore, the motor 8 generates auxiliary torque to compensate for the insufficient torque.

The turbine 91 includes a turbine housing 911 and a turbine wheel 912. Turbine housing 911 accommodates turbine wheel 912 . Turbine housing 911 has scroll passage 914 . Scroll flow path 914 extends circumferentially around turbine wheel 912 .

The turbine housing 911 has an inlet 913 and an outlet 915. Exhaust gas discharged from the internal combustion engine flows into the turbine housing 911 through the inlet 913. The exhaust gas that has flowed in flows into the turbine wheel 912 through the scroll passage 914 . The exhaust gas causes turbine wheel 912 to rotate. The exhaust gas then flows out of the turbine housing 911 through the outlet 915.

The compressor 92 has a compressor housing 921 and a compressor impeller 922. Compressor housing 921 accommodates compressor wheel 922 . Compressor housing 921 has scroll passage 924 . Scroll passage 924 extends circumferentially around compressor wheel 922 .

The compressor housing 921 has an inlet 923 and an outlet 925. When the turbine wheel 912 rotates, the compressor wheel 922 rotates via a rotating body 8R, which will be described later. The rotating compressor wheel 922 sucks in outside air through an intake port 923 . The intake air is compressed by passing through a compressor wheel 922 and a scroll passage 924 . Air is discharged from the discharge port 925 as compressed air. Compressed air is supplied to the internal combustion engine.

The motor 8 is, for example, a brushless DC motor. Motor 8 includes motor rotor 1 , motor stator 7 , and motor housing 94 .

The motor rotor 1 is housed in a motor housing 94. The motor rotor 1 is arranged between

bearings

951 and 952 in the axial direction. Motor stator 7 is also housed in motor housing 94 . Motor stator 7 is arranged at approximately the same position as motor rotor 1 in the axial direction. Motor stator 7 surrounds motor rotor 1 . The inner peripheral surface of the motor stator 7 is spaced apart from the outer peripheral surface of the motor rotor 1.

The motor rotor 1, T shaft 4, and C shaft 3 constitute a rotating body 8R. The rotating body 8R is rotatably supported by the turbine housing 911 and the compressor housing 921. A turbine wheel 912 is provided at one end of the T-shaft 4 . A compressor wheel 922 is provided at one end of the C shaft 3.

The C shaft 3 has a thrust collar 931. The thrust collar 931 projects in the radial direction of the C shaft 3. The shape of the thrust collar 931 is, for example, a disk shape. A pair of

air bearings

961 and 962 are provided on both sides of the thrust collar 931. A spacer 97 surrounding the thrust collar 931 is provided between the pair of

air bearings

961 and 962.

The pair of

air bearings

961 and 962 and the spacer 97 are integrated with a plurality of fastening bolts.

Air bearings

961, 962 and spacer 97 support C-shaft 3 in the thrust direction. The thrust collar 931 is rotatable without contacting the

air bearings

961, 962 and the spacer 97.

<Motor rotor>
FIG. 2(a) is a sectional view of the motor rotor 1. FIG. 2(b) is an enlarged view of the main part D shown in FIG. 2(a). The motor rotor 1 includes a magnet 2, a C shaft 3 (shaft unit), a T shaft 4 (shaft unit), and an armor ring 5. The C-shaft 3 and the T-shaft 4 are components of the T-shaft 4 described above.

<Magnet>
The shape of the magnet 2 is a cylinder. Magnet 2 is solid. The magnet 2 has no through holes formed therein. The magnet 2 has a magnet circumferential surface 21 , a first magnet end surface 22 , and a second magnet end surface 23 . The material of the magnet 2 may be, for example, neodymium (Nd-Fe-B) or samarium cobalt.

<C shaft>
C-shaft 3 is connected to compressor wheel 922. The C-shaft 3 includes a C-shaft insertion portion 31, a C-shaft protrusion 32, and a C-shaft connection portion 33. These parts are integral.

The shape of the C-shaft insertion portion 31 is a cylinder. The C-shaft insertion portion 31 has a C-shaft end surface 311 and a C-shaft friction surface 312. The C-shaft insertion portion 31 is covered by the armor ring 5. More specifically, the C-shaft insertion portion 31 is arranged in an interference fit relationship with the armor ring 5. The outer diameter of the C-shaft insertion portion 31 is the same as the outer diameter of the magnet 2. In other words, the outer diameter of the C-shaft insertion portion 31 is the same as the inner diameter of the armor ring 5.

The C shaft end surface 311 is in contact with the first magnet end surface 22. The C-shaft end surface 311 only needs to be in contact with the first magnet end surface 22, and does not need to be fixed with an adhesive or the like.

The shape of the C-shaft protrusion 32 is a cylinder. The C-shaft protrusion 32 is not covered by the armor ring 5. A compressor wheel 922 is connected to the tip of the C-shaft protrusion 32 (see FIG. 1). In the example shown in FIG. 2A, the outer diameter of the C-shaft protruding portion 32 is smaller than the outer diameter of the C-shaft insertion portion 31. The relationship between the outer diameter of the C-shaft protruding portion 32 and the outer diameter of the C-shaft insertion portion 31 is not limited to the size relationship shown in FIG. 2(a). For example, the outer diameter of the C-shaft protruding portion 32 may be the same as the outer diameter of the C-shaft insertion portion 31.

The C-shaft connecting portion 33 is provided between the C-shaft insertion portion 31 and the C-shaft protruding portion 32. A portion of the C-shaft connecting portion 33 is covered by the armor ring 5. Another portion of the C-shaft connecting portion 33 protrudes from the armor ring 5. The length of the C-shaft insertion portion 31 along the direction of the rotation axis H is longer than the length of the C-shaft connection portion 33 along the direction of the rotation axis H.

The C-shaft connecting portion 33 has a C-shaft inward contact surface 331, a C-shaft outer circumferential surface 332, a C-shaft tapered surface 333, and a C-shaft connecting surface 334. The C-shaft inward contact surface 331, the C-shaft outer peripheral surface 332, and the C-shaft tapered surface 333 constitute a C-shaft collar portion 33S.

The C-shaft inward contact surface 331 faces the same direction as the C-shaft end surface 311. The shape of the C-shaft inward abutment surface 331 is a ring when viewed from the direction of the rotational axis H. The inner diameter of the C-shaft inward abutment surface 331 is the same as the outer diameter of the C-shaft insertion portion 31. The outer diameter of the C-shaft inward abutment surface 331 is larger than the outer diameter of the C-shaft insertion portion 31. The C-shaft connecting portion 33 includes a portion that is thicker than the C-shaft insertion portion 31.

The C-shaft inward contact surface 331 contacts a ring contact surface 522, which will be described later. The C-shaft inward abutment surface 331 is accommodated in the armor ring 5. Specifically, the C-shaft inward contact surface 331 is pressed against the ring contact surface 522. As a result, the insertion depth of the C shaft 3 into the armor ring 5 is determined. The C shaft outer peripheral surface 332 is a cylindrical surface. The first edge of the C-shaft outer circumferential surface 332 is the outer circumferential edge of the C-shaft inward abutment surface 331 . The second edge of the C-shaft outer peripheral surface 332 is the first edge of the C-shaft tapered surface 333.

The C-shaft outer peripheral surface 332 faces a caulking inner peripheral surface 523d, which will be described later. The C-shaft outer peripheral surface 332 is accommodated in the armor ring 5. In the example of FIG. 2(b), the C-shaft outer peripheral surface 332 is not in contact with the caulking inner peripheral surface 523d. A gap exists between the C-shaft outer peripheral surface 332 and the caulking inner peripheral surface 523d. Therefore, the outer diameter of the C-shaft outer circumferential surface 332 is slightly smaller than the inner diameter of the caulking inner circumferential surface 523d. The length of the C-shaft outer peripheral surface 332 along the direction of the rotation axis H is approximately the same as the length of the caulking inner peripheral surface 523d along the direction of the rotation axis H.

The C-shaft tapered surface 333 connects the C-shaft outer peripheral surface 332 to the C-shaft connection surface 334. The C-shaft tapered surface 333 has an outer diameter that decreases along the direction from the C-shaft insertion portion 31 toward the C-shaft connection surface 334 . For example, when using the rotational axis H as a reference, the angle K from the rotational axis H to the C-shaft tapered surface 333 is greater than or equal to 20 degrees and less than or equal to 90 degrees. In the example shown in FIG. 2(b), the angle K from the rotational axis H to the C-shaft tapered surface 333 is 45 degrees.

A portion of the C-shaft tapered surface 333 is covered by the armor ring 5. The C-shaft insertion portion 31 side of the C-shaft tapered surface 333 is covered by the ring caulking portion 523 of the armor ring 5. More specifically, the ring caulking portion 523 is in contact with the C-shaft tapered surface 333. In this contact, the entire surface of the ring caulking portion 523 may be in contact with the C-shaft tapered surface 333, or a portion of the ring caulking portion 523 may be in contact with the C-shaft taper surface 333. For example, the tip of the ring caulking portion 523 may be in contact with the C-shaft tapered surface 333.

Another part of the C-shaft tapered surface 333 protrudes from the armor ring 5. The length of the C-shaft tapered surface 333 along the direction of the rotation axis H is longer than the length of the ring caulking portion 523 along the direction of the rotation axis H.

The C-shaft connecting surface 334 connects the C-shaft collar 33S to the C-shaft protrusion 32. C-shaft connection surface 334 is a circumferential surface. The outer diameter of the C-shaft connection surface 334 is constant.

The functional relationship between the C-shaft 3 and the armor ring 5 is as follows.

First, the C-shaft 3 is fixed to the armor ring 5. More specifically, the C-shaft friction surface 312, which is the outer peripheral surface, is in contact with the ring friction surface 521. The C-shaft friction surface 312 receives a pressing force from the ring friction surface 521. Due to the pressing force, a friction force is generated between the C-shaft friction surface 312 and the ring friction surface 521. The C-shaft 3 is fixed to the armor ring 5 by frictional force.

Second, the position of the C-shaft 3 relative to the armor ring 5 is maintained by the armor ring 5. More specifically, the C-shaft collar portion 33S of the C-shaft connecting portion 33 is sandwiched between the ends of the armor ring 5. As a result, the position of the C-shaft connecting portion 33 along the rotational axis H is maintained. This maintenance includes suppressing movement of the C-shaft coupling portion 33 along the rotational axis H. This maintenance also includes restoring the position of the C-shaft coupling portion 33 that has been moved along the rotational axis H to its original position.

<T shaft>
The T-shaft 4 is connected to a turbine wheel 912. The T-shaft 4 has approximately the same configuration as the C-shaft 3. The T-shaft 4 includes a T-shaft insertion portion 41, a T-shaft protrusion 42, and a T-shaft connection portion 43. The T-shaft 4 differs from the C-shaft 3 in that the T-shaft connecting portion 43 does not include a portion corresponding to the C-shaft connecting surface 334. The length of the T-shaft tapered surface 432 along the direction of the rotation axis H is the same as the length of the ring caulking portion 533 along the direction of the rotation axis H. Even with these differences, the T-shaft 4 can perform the same function as the C-shaft 3. The T-shaft 4 is fixed to the armor ring 5. The position of the T-shaft 4 relative to the armor ring 5 is maintained by the armor ring 5.

<Armor Ring>
The armor ring 5 prevents the magnet 2 from being damaged due to centrifugal force. The shape of the armor ring 5 is cylindrical. Armor ring 5 accommodates magnet 2. The armor ring 5 covers a portion of the C-shaft 3 and a portion of the T-shaft 4.

The armor ring 5 has a first ring accommodating part 51, a second ring accommodating part 52, and a third ring accommodating part 53. The first ring accommodating portion 51 accommodates the magnet 2. The second ring accommodating portion 52 accommodates the C shaft 3. The third ring accommodating portion 53 accommodates the T-shaft 4. The first ring accommodating part 51 is sandwiched between a second ring accommodating part 52 and a third ring accommodating part 53. Due to the fact that the T-shaft 4 had roughly the same configuration as the C-shaft 3, the third ring-accommodating portion 53 that accommodates the T-shaft 4 is also similar to the second ring-accommodating portion 52 that accommodates the C-shaft 3. They have roughly the same configuration. Therefore, a detailed explanation of the third ring accommodating part 53 will be omitted, and the second ring accommodating part 52 will be described in detail.

The second ring housing portion 52 has a ring friction surface 521, a ring contact surface 522, and a ring caulking portion 523. The ring friction surface 521 is in contact with the C-shaft friction surface 312 of the C-shaft insertion portion 31 . The inner diameter of the ring friction surface 521 is the same as the inner diameter of the first ring accommodating portion 51. There is no explicit boundary between the inner circumferential surface 511 of the first ring accommodating portion 51 and the ring friction surface 521.

The C-shaft inward contact surface 331 is pressed against the ring contact surface 522. The shape of the ring contact surface 522 is a ring when viewed from the direction of the rotation axis H. The inner diameter of the ring contact surface 522 matches the inner diameter of the ring friction surface 521. The outer diameter of the ring contact surface 522 may be slightly smaller than the inner diameter of the ring caulking portion 523.

The ring caulking portion 523 is a portion that is thinner than the first ring accommodating portion 51. Referring to the cross-sectional shape shown in FIG. 2(b), it can be said that the cross-sectional shape of the ring caulking portion 523 is a cantilever beam. When a force is applied to the tip of the ring caulking portion 523 in a direction perpendicular to the rotational axis H, the ring caulking portion 523 deforms in the direction of the force. For example, the ring caulking portion 523 deforms so as to bend in the direction of the force. In the ring caulking portion 523, a plastically deformed portion is referred to as a caulking deformation portion 523a. The caulking deformation portion 523a includes a caulking contact portion 523b that contacts the C-shaft tapered surface 333. The portion of the ring crimped portion 523 that is not deformed is referred to as a crimped non-deformed portion 523c. The caulking non-deforming portion 523c has a caulking inner circumferential surface 523d.

Due to such deformation, the C-shaft collar portion 33S is sandwiched between the caulking deformation portion 523a and the ring contact surface 522. The ring caulking portion 523 exerts a force that presses the C shaft 3 in a direction toward the magnet 2 along the rotation axis H.

The caulking deformation portion 523a can be elastically deformed in accordance with the deformation of the C shaft 3. For example, assume that the C-shaft 3 is exposed to a high-temperature environment and is extended in the direction of the rotational axis H. Then, the C-shaft tapered surface 333 moves to the right side of the paper in FIG. 2(b). Along with this movement, the caulking deforming portion 523a can also bend. Since this deformation is slight, the deformation of the caulking deformation portion 523a does not reach the plastic deformation region. The deformation of the caulking deformation portion 523a remains in the elastic deformation region.

Next, it is assumed that as a result of the C-shaft 3 being returned from a high-temperature environment to a room-temperature environment, the C-shaft 3 is no longer elongated in the direction of the rotational axis H and has returned to its original length. Movement of the C-shaft 3 occurs due to contraction of the C-shaft 3. The C-shaft 3 receives a force from the caulking deformation portion 523a in a direction that presses the C-shaft inward abutment surface 331 against the ring abutment surface 522. As a result, the direction of movement of the C-shaft 3 due to contraction of the C-shaft 3 is uniquely determined by the force caused by the caulking deformation portion 523a. The direction of movement of the C-shaft 3 due to contraction of the C-shaft 3 is always the direction in which the C-shaft inward abutting surface 331 is pressed against the ring abutting surface 522.

Then, even if the C-shaft 3 is repeatedly expanded and contracted, the C-shaft 3 can return to its original position when it contracts. Therefore, even if the C-shaft 3 is repeatedly expanded and contracted, the positional relationship between the C-shaft 3 and the armor ring 5 will not shift. Similarly, no deviation occurs in the positional relationship between the C-shaft 3 and the magnet 2.

If the direction of movement of the C-shaft 3 is not uniquely determined, the changes caused by expansion and contraction of the C-shaft 3 are irreversible. As a result, each time the C-shaft 3 expands and contracts, deviations from the original state accumulate. If the accumulation of deviations becomes large, the motor rotor 1 will be in a state where it is difficult to exhibit the desired performance. Therefore, in the motor rotor 1 of the present disclosure, the direction of movement of the C-shaft 3 due to contraction of the C-shaft 3 is uniquely determined by the force generated by the caulking deformation portion 523a. As a result, the changes caused by expansion and contraction of the C-shaft 3 are reversible. Even if the C-shaft 3 is repeatedly expanded and contracted, it can return to its original state. As a result, deviations do not accumulate. Therefore, the state in which the motor rotor 1 can exhibit desired performance can be maintained.

The above motor rotor 1 includes a magnet 2 including a magnet circumferential surface 21, a first magnet end surface 22, and a second magnet end surface 23, and a C shaft 3 including a C shaft end surface 311 that abuts the first magnet end surface 22. , an armor ring 5 that covers the portion where the first magnet end surface 22 is in contact with the C-shaft end surface 311 and the magnet circumferential surface 21. The C-shaft 3 is located between a C-shaft insertion portion 31 covered by the armor ring 5, a C-shaft protrusion 32 not covered by the armor ring 5, and a C-shaft insertion portion 31 and the C-shaft protrusion 32. A C-shaft connecting portion 33 that contacts the end of the ring 5 is included. The end portion of the armor ring 5 includes a ring caulking portion 523 bent toward the rotation axis H of the C-shaft 3 .

The motor rotor 1 has a ring caulking portion 523 provided at the end of the armor ring 5. Since the ring caulking portion 523 is bent so as to approach the rotational axis H of the C-shaft 3, it can exert a force that presses the C-shaft 3 toward the magnet 2. As a result, the direction of movement of the C-shaft 3 that occurs during thermal contraction can be determined to be toward the magnet 2. According to such a configuration, even if thermal expansion and contraction are repeated, the relative positional relationship between the C-shaft 3 and the magnet 2 can be maintained. Therefore, the motor rotor 1 can continue to maintain desired performance.

The C-shaft connecting portion 33 includes a C-shaft tapered surface 333 that contacts the ring crimping portion 523. This configuration allows it to accommodate the thermal expansion of the C-shaft 3 while determining the direction of movement of the C-shaft 3 when it thermally contracts.

The armor ring 5 includes a first ring accommodating part 51 in which the magnet 2 is accommodated, a second ring accommodating part 52 in which the C-shaft insertion part 31 is disposed, a ring contact surface in which the C-shaft connecting part 33 is disposed, and a ring abutting surface. 522. The C-shaft connecting portion 33 includes a C-shaft inward abutment surface 331 that abuts against the ring abutment surface 522 along the rotational axis H of the C-shaft 3 . According to this configuration, the insertion depth of the C shaft 3 into the armor ring 5 can be determined.

The C-shaft connecting portion 33 is sandwiched between the ring caulking portion 523 and the ring contact surface 522. According to this configuration, it is possible to both determine the insertion depth of the C-shaft 3 into the armor ring 5 and determine the moving direction when the C-shaft 3 is thermally contracted.

The outer diameter of the C-shaft inward abutment surface 331 is larger than the outer diameter of the C-shaft insertion portion 31. According to this configuration, the C shaft 3 can be reliably brought into contact with the armor ring 5.

The C-shaft end face 311 is in contact with the first magnet end face 22 . The T-shaft end face 411 faces the second magnet end face 23 on the opposite side to the first magnet end face 22 . According to this configuration, a solid magnet 2 can be used.

The motor 8 includes a motor rotor 1 and a motor stator 7 including a coil arranged around the motor rotor 1. This motor 8 includes the motor rotor 1 described above. Therefore, this motor 8 can also continue to maintain desired performance.

The supercharger 9 includes a motor 8 and a compressor wheel 922 (impeller) rotated by the motor 8. Motor 8 includes a motor rotor 1 and a motor stator 7 including a coil arranged around motor rotor 1 . The supercharger 9 includes the motor rotor 1 described above. Therefore, this supercharger 9 can also continue to maintain desired performance.

Hereinafter, two modified examples of the motor rotor 1 of the first embodiment will be described.

<Modification 1 of the first embodiment>
FIG. 3(a) shows a motor rotor 1A that is a first modification of the first embodiment. The motor rotor 1A of Modification 1 differs from the motor rotor 1 of the first embodiment in that the angle of the ring caulking portion 523A with respect to the rotational axis H is about 90°. Hereinafter, the structure of the motor rotor 1A of Modification 1 that is different from the motor rotor 1 of the first embodiment will be explained in detail. Regarding the structure of the motor rotor 1A of Modification 1, the description of the parts common to the structure of the motor rotor 1 of the first embodiment will be omitted as appropriate.

The C-shaft connecting portion 33A of the C-shaft 3A has a C-shaft inward contact surface 331, a C-shaft outer peripheral surface 332, a C-shaft connection surface 334, and a C-shaft outward contact surface 335.

The C-shaft outward contact surface 335 corresponds to the C-shaft tapered surface 333 of the first embodiment. The ring caulking portion 523A abuts against the C-shaft outward abutment surface 335. The ring caulking portion 523A may apply a pressing force to the C-shaft outward abutment surface 335. The ring caulking portion 523A may simply be in contact with the C-shaft outward contact surface 335.

The angle of the C-shaft outward abutment surface 335 with respect to the rotational axis H is 90°. The orientation of the C-shaft outward abutting surface 335 is opposite to the C-shaft inward abutting surface 331. The shape of the C-shaft outward abutment surface 335 is a ring when viewed from the direction of the rotational axis H.

The outer diameter of the C-shaft outward contact surface 335 is the same as the outer diameter of the C-shaft outer peripheral surface 332. The inner diameter of the C-shaft outward abutting surface 335 is smaller than the outer diameter of the C-shaft inward abutting surface 331. The inner diameter of the C-shaft outward abutting surface 335 is the same as the outer diameter of the C-shaft connecting surface 334.

The armor ring 5A has a ring caulking portion 523A. In the armor ring 5A of the first modification, the shape before forming the ring caulking portion 523A is the same as the armor ring 5 of the first embodiment. In Modification 1, the structure of the C-shaft connecting portion 33A is different from the structure of the C-shaft connecting portion 33 of the first embodiment. In Modification 1, the shape of the armor ring 5A after forming the ring caulking portion 523A is different from the armor ring 5 of the first embodiment.

The ring caulking portion 523A is bent from a portion including the caulking inner peripheral surface 523d. With this structure as well, the C-shaft collar portion 33S is sandwiched between the ring caulking portion 523A and the ring abutment surface 522. In the case of Modification 1, the bending angle of the ring caulking portion 523A is approximately 90°. Therefore, the ring caulking portion 523A can generate a strong force in the opposite direction to the moving direction of the C-shaft 3 (the direction from left to right in FIG. 3(a)). As a result, the ring caulking portion 523A of Modification 1 can more strongly suppress the movement of the C-shaft connecting portion 33A along the rotation axis H.

<Modification 2 of the first embodiment>
FIG. 3(b) shows a motor rotor 1B which is a second modification of the first embodiment. The motor rotor 1B of the second modification differs from the motor rotor 1 of the first embodiment in that it does not include the C-shaft inward contact surface 331. The motor rotor 1B of Modification 2 differs from the motor rotor 1 of the first embodiment in that the armor ring 5B does not include a ring contact surface 522. Hereinafter, the structure of the motor rotor 1B of Modification 2, which is different from the motor rotor 1 of the first embodiment, will be explained in detail. Regarding the structure of the motor rotor 1B of Modification 2, the description of the parts common to the structure of the motor rotor 1 of the first embodiment will be omitted as appropriate.

The C-shaft connecting portion 33B of the C-shaft 3B has a C-shaft tapered surface 333 and a C-shaft connecting surface 334. One edge of the C-shaft tapered surface 333 matches the edge of the C-shaft insertion portion 31. The maximum outer diameter of the C-shaft tapered surface 333 of Modification 2 is the same as the outer diameter of the C-shaft insertion portion 31.

Since the motor rotor 1B of Modification 2 does not include the C-shaft inward contact surface 331, the insertion depth of the C-shaft 3 cannot be determined. In the first embodiment with the C-shaft inward abutment surface 331, the C-shaft 3 could be inserted into the armor ring 5 until the C-shaft inward abutment surface 331 abuts the ring abutment surface 522. When the C-shaft inward contact surface 331 is in contact with the ring contact surface 522, the C-shaft end surface 311 is in contact with the first magnet end surface 22, or the C-shaft end surface 311 and the first magnet end surface are in contact with each other. 22, a very small gap is formed between the two. The C shaft 3B of modification 2 can be inserted into the armor ring 5 until it comes into contact with the magnet 2. As a result, in the C-shaft 3 of the second modification, the C-shaft end surface 311 comes into contact with the first magnet end surface 22.

The motor rotor 1B of Modification 2 also includes a C-shaft tapered surface 333 and a ring caulking portion 523. Therefore, the function of maintaining the position of the C-shaft 3B with respect to the armor ring 5B can be performed in the same manner.

<Second embodiment>
A motor rotor 1C according to the second embodiment will be described with reference to FIGS. 4(a) and 4(b). FIG. 4(b) is a sectional view taken along line IV-IV in FIG. 4(a). The motor rotor 1 of the first embodiment employs a solid magnet 2. The motor rotor 1C of the second embodiment employs a hollow magnet 2C.

The motor rotor 1C has two magnets 2C, one shaft 61, and two sleeves 62. The magnet 2C is a so-called hollow type. The magnet 2C has a magnet through hole 21C, a first magnet end surface 22C, and a second magnet end surface 23C. The shape of the magnet 2C is a cylinder. A shaft 61 is inserted through the magnet through hole 21C.

The shaft unit 6C of the motor rotor 1C of the second embodiment is composed of one shaft 61 and two sleeves 62.

The sleeve 62 corresponds to the C-shaft connecting portion 33 of the first embodiment. The sleeve 62 has a sleeve through hole 62h. The shaft 61 is inserted through the sleeve through hole 62h. For example, the sleeve 62 is attached to the shaft 61 by shrink fitting or the like.

Two magnets 2C are arranged between the first sleeve 62 and the second sleeve 62. A sleeve 62 is fixed to the shaft 61. This fixation maintains the position of the magnet 2C.

The sleeve 62 includes a sleeve contact surface 621, a sleeve outer peripheral surface 622, a sleeve tapered surface 623, a sleeve friction surface 624, a sleeve end surface 625, and a sleeve front surface 626. The sleeve contact surface 621 corresponds to the C-shaft inward contact surface 331. The sleeve outer circumferential surface 622 corresponds to the C-shaft outer circumferential surface 332. The sleeve tapered surface 623 corresponds to the C-shaft tapered surface 333. The sleeve friction surface 624 corresponds to the C-shaft friction surface 312 of the magnet 2. The sleeve end surface 625 contacts the magnet end surface 22 or the magnet end surface 23 of the magnet 2 .

According to such a structure, when the shaft 61 that has been exposed to high temperature conditions and contracts, the direction of the contraction can be determined from the sleeve 62 toward the magnet 2C. As a result, even if a gap occurs between the ring abutting surface 522 and the sleeve abutting surface 621 when the shaft 61 is in an extended state due to exposure to high temperatures, the shaft 61 will contract when the temperature returns to room temperature. In this state, the sleeve contact surface 621 can return to the state in which the ring contact surface 522 is in contact with the sleeve contact surface 621.

The magnet 2C of the motor rotor 1C includes a magnet through hole 21C that penetrates from the first magnet end surface 22C to the second magnet end surface 23C on the opposite side to the first magnet end surface 22C. The shaft unit 6C includes a shaft 61 and a sleeve 62. According to this configuration, a hollow magnet 2C can be employed.

<Modified example of second embodiment>
The magnet 2C of the second embodiment was an integral part having a cylindrical shape since it was a single part. FIG. 5(a) is a sectional view of a motor rotor 1D according to a modification of the second embodiment. FIG. 5(b) is a cross-sectional view of the motor rotor 1D taken along the VV line in FIG. 5(a). As shown in FIGS. 5(a) and 5(b), the magnet 2D may be composed of a plurality of magnet pieces 2D1, 2D2, 2D3, and 2D4, respectively. Each of the plurality of magnet pieces 2D1, 2D2, 2D3, and 2D4 has a fan-shaped cross-section (see FIG. 5(b)). The magnet 2D includes a first magnet end surface 22D and a second magnet end surface 23D. The magnet 2D also has a sleeve 62, but this sleeve 62 is the same as the sleeve 62 that the magnet 2C of the second embodiment has.

<Third embodiment>
A motor rotor 1E according to a third embodiment will be explained. As shown in FIG. 2(b), in the ring caulking portion 523 of the first embodiment, the caulking contact portion 523b was in contact with the C-shaft tapered surface 333. As shown in FIG. 6, in the motor rotor 1E of the third embodiment, the caulking head 56 of the ring caulking portion 523E is fitted into the C-shaft groove 35 provided in the C-shaft tapered surface 333E. In the following description, the structure in which the caulking head 56 is fitted into the C-shaft groove 35 will be referred to as a "double caulking structure." Note that, as a third embodiment, a case where a double caulking structure is applied to the C shaft 3 of the motor rotor 1 of the first embodiment will be described as an example. The double caulking structure can also be applied to the T-shaft 4 of the motor rotor 1 of the first embodiment.

Similarly, the double caulking structure is applied to the motor rotor 1A of modification 1 of the first embodiment (see FIG. 3(a)) and the motor rotor 1B of modification 2 of the first embodiment (see FIG. 3(b)). You can also. The double caulking structure can also be applied to the motor rotor 1C (see FIG. 4(a)) of the second embodiment. The double caulking structure can also be applied to the motor rotor 1D (see FIG. 4(b)) as a modification of the second embodiment.

The C-shaft 3E has a C-shaft connecting portion 33E. The C-shaft connecting portion 33E has a C-shaft inward contact surface 331, a C-shaft outer peripheral surface 354, and a C-shaft tapered surface 333E.

A C-shaft groove 35 is provided in the C-shaft tapered surface 333E. The C-shaft groove 35 is a portion recessed from the C-shaft tapered surface 333E along the normal direction of the C-shaft tapered surface 333E. The C-shaft groove 35 may extend in an arc shape around the rotation axis H on the conical C-shaft tapered surface 333E. The C-shaft groove 35 may be a series of recesses. The C-shaft grooves 35 may be provided at predetermined angles with respect to the rotational axis H. For example, the C-shaft grooves 35 may be configured as four grooves provided every 90 degrees with respect to the rotational axis H.

The C-shaft groove 35 is an area surrounded by a C-shaft groove rear surface 351, a C-shaft groove front surface 352, and a C-shaft groove bottom surface 353. The tip of the ring caulking portion 523 (caulking head 56) is fitted into the C-shaft groove 35. The armor ring 5E has a ring caulking portion 523E.

The ring caulking portion 523E has a caulking neck portion 55 and a caulking head portion 56. The caulking neck portion 55 extends in the direction of the rotation axis H from the outer peripheral side of the ring contact surface 522. The thickness of the caulking neck portion 55 becomes thinner toward the tip (see FIG. 7(a)). The inner surface of the caulking neck portion 55 is referred to as a caulking neck inner circumferential surface 551.

The caulking head 56 is provided at the tip of the caulking neck 55. The caulking head 56 has a caulking head rear surface 561, a caulking head front surface 562, and a caulking head bottom surface 563. The caulking head rear surface 561 is connected to the caulking neck inner peripheral surface 551. When the caulking head 56 is fitted into the C-shaft groove 35, the caulking head rear surface 561 contacts the C-shaft groove rear surface 351. The caulking head front surface 562 faces the C-shaft groove front surface 352. A slight gap exists between the caulking head front surface 562 and the C-shaft groove front surface 352. The caulking head bottom surface 563 faces the C-shaft groove bottom surface 353. A slight gap also exists between the caulking head bottom surface 563 and the C-shaft groove bottom surface 353.

The function of the ring caulking portion 523E will be explained in detail. In the ring caulking portion 523E, the caulking head 56 is caught in the C-shaft groove 35, thereby making it difficult for the caulking head 56 to come off from the C-shaft groove 35.

The armor ring 5E is made of a material that is heat resistant and has high strength, such as Inconel. For example, Inconel, which is a high strength material, has higher strength than steel materials such as mild steel. During the caulking work, when force is applied to the tip of the ring caulking part 523E, even if the tip of the ring caulking part 523E is in contact with the C-shaft tapered surface 333E, the force applied to the tip of the ring caulking part 523E is In the released state, the tip of the ring caulking portion 523E slightly tries to return to its original state. Such a phenomenon is called springback. For example, when springback occurs, a slight gap may occur between the tip of the ring caulking portion 523E and the C-shaft tapered surface 333E.

The double crimping structure exerts a force that opposes the force FS that causes this springback. As a result, the state in which the caulking head 56 is caught in the C-shaft groove 35 is maintained. As shown in FIG. 6, the caulking head rear surface 561 is in contact with the C-shaft groove rear surface 351. The force FS that causes springback has a component that presses the caulking head rear surface 561 against the C-shaft groove rear surface 351. The caulking head rear surface 561 is pressed against the C-shaft groove rear surface 351. As a result, a frictional force FR is generated between the caulking head rear surface 561 and the C-shaft groove rear surface 351. Frictional force FR can oppose force FS, which causes springback.

The process of forming the double crimped structure will be described with reference to FIGS. 7(a) to 7(d).

FIG. 7(a) shows the situation immediately before starting the caulking work. Before starting the crimping work, the crimping neck 55 is not bent. In such a configuration, a force FP is applied to the caulking head 56.

FIG. 7(b) shows a state in which the caulking neck portion 55 is slightly bent from the state shown in FIG. 7(a). In this state, the caulking neck portion 55 bends in the direction of the force FP, starting from the corner 57 between the caulking neck inner circumferential surface 551 and the ring contact surface 522. In this state, the caulking neck 55 and the caulking head 56 bend as one. Therefore, the relative positional relationship between the caulking neck 55 and the caulking head 56 does not change.

FIG. 7(c) shows the result of further applying force FP to the caulking head 56 from the state shown in FIG. 7(b). In this state, the caulking neck inner circumferential surface 551 contacts the C-shaft outer circumferential surface 354 (see point 58). In this state, the caulking head 56 is fitted into the C-shaft groove 35. The caulking head rear surface 561 is not in contact with the C-shaft groove rear surface 351. The caulking head 56 is not caught in the C-shaft groove 35.

FIG. 7(d) shows the result of further applying force FP to the caulking head 56 from the state shown in FIG. 7(c). In the state shown in FIG. 7(c), the caulking neck inner circumferential surface 551 is in contact with the C-shaft outer circumferential surface 332 (point 58). Therefore, if force FP is further applied from the state shown in FIG. 7(c), the tip side will bend from point 58 with point 58 as the starting point. The caulking neck portion 55 does not bend. The caulking head 56 bends relative to the caulking neck 55. Due to this bending, the caulking head rear surface 561 gradually approaches the C-shaft groove rear surface 351. Finally, the caulking head rear surface 561 contacts the C-shaft groove rear surface 351.

The double crimping structure is formed by two bends: the crimping neck 55 bends relative to the ring body 5S including the ring friction surface 521, and the crimping head 56 bends relative to the crimping neck 55. . Because it is formed by two bends in this way, it is called a "double crimped structure."

Releasing the force FP causes springback as described above. This springback causes the caulking head rear surface 561 to be pressed against the C-shaft groove rear surface 351, so that the caulking head 56 does not come off from the C-shaft groove 35.

The C-shaft connecting portion 33E of the motor rotor 1E includes a C-shaft groove 35. The ring caulking portion 523E includes a caulking neck portion 55 including a portion (point 58) in contact with the C-shaft connecting portion 33E, and a caulking head portion 56 including a portion disposed in the C-shaft groove 35. The caulking head 56 includes a caulking head rear surface 561 that contacts the C-shaft groove rear surface 351. According to this configuration, the ring caulking portion 523E of the armor ring 5E can be reliably hooked onto the C-shaft 3E.

The motor rotor, motor, and supercharger of the present disclosure are not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

The motor rotor of the present disclosure includes [1] a shaft unit including a magnet including a magnet circumferential surface and a pair of magnet end faces, a shaft end face that abuts the magnet end face, and a portion where the magnet end face is in contact with the shaft end face. and an armor ring that covers the circumferential surface of the magnet, and the shaft unit includes an insertion portion covered by the armor ring, a protrusion portion not covered by the armor ring, and the insertion portion and the protrusion. a connecting portion located between the parts and in contact with an end of the armor ring, the end of the armor ring including a caulked part bent toward the axis of the shaft unit. It is.

The motor rotor of the present disclosure is [2] “The motor rotor according to [1] above, wherein the connecting portion includes a tapered surface in contact with the caulking portion.”

The motor rotor of the present disclosure includes [3] "The armor ring includes a first housing part in which the magnet is housed, a second housing part in which the insertion part is disposed, and a ring contact area in which the connecting part is disposed. a third accommodating part including a contact surface, and the connecting part includes a shaft contact surface that contacts the ring contact surface along the axial direction of the shaft unit, [1] or [2] above. The motor rotor described in .

The motor rotor of the present disclosure is [4] “The motor rotor according to [3] above, wherein the connecting portion is sandwiched between the caulking portion and the ring contact surface.”

The motor rotor of the present disclosure is [5] “The motor rotor according to [3] or [4] above, wherein the outer diameter of the shaft contacting surface is larger than the outer diameter of the insertion portion.”

The motor rotor of the present disclosure includes [6] "The shaft end surface is an end surface of the insertion portion, the first magnet end surface is in contact with the first shaft end surface of the first shaft unit, and the first magnet end surface is in contact with the first shaft end surface of the first shaft unit. The motor rotor according to any one of [1] to [5] above, wherein the second shaft end surface of the second shaft unit is in contact with the second magnet end surface on the opposite side.

The motor rotor of the present disclosure includes [7] "The magnet includes a magnet through hole that penetrates from the first magnet end surface to the second magnet end surface on the opposite side to the first magnet end surface, and the shaft The unit includes the motor rotor according to any one of [1] to [5] above, including a shaft member including the protruding portion and a portion inserted into the magnet through hole, and a sleeve member including the connecting portion. .”

The motor rotor of the present disclosure is provided with the following features: [8] “The connecting portion includes a shaft groove, and the caulking portion includes a neck portion including a portion in contact with the connecting portion, and is bent with respect to the neck portion and disposed in the shaft groove. the motor rotor according to [1] above, wherein the head includes a surface that abuts a surface that constitutes the shaft groove.

1, 1A, 1B, 1C, 1D,

1E Motor rotor

2, 2C Magnet 21 Magnet circumferential surface 21C Magnet through hole 22 First magnet end surface 23 Second

magnet end surface

3, 3A C shaft (shaft unit)
31 C-shaft insertion portion 311 C-shaft end surface 312 C-shaft friction surface 32 C-

shaft protruding portion

33, 33A C-shaft connecting portion 33S C-shaft collar portion 331 C-shaft inward contact surface 332 C-shaft outer peripheral surface 333 C-shaft tapered surface 334 C-shaft connection surface 335 C-shaft outward contact surface 35 C-shaft groove 351 C-shaft groove rear surface 352 C-shaft groove front surface 353 C-shaft groove bottom surface 4 T-shaft (shaft unit)
41 T-shaft insertion portion 411 T-shaft end face 42 T-shaft protrusion 43 T-shaft connection portion 432 T-shaft tapered surface 5 Armor ring 51 First ring accommodating portion 511 Inner peripheral surface 52 Second ring accommodating portion 521 Ring friction surface 522 Ring contact Contact surface 523 Ring caulking portion 523a Caulking deformation portion 523A Ring caulking portion 523b Caulking contact portion 523c Caulking non-deforming portion 523d Caulking inner circumferential surface 523E Ring caulking portion 53 Third ring housing portion 55 Caulking neck portion 551 Caulking neck inner circumferential surface 56 Caulking head Part 561 Back surface of caulking head 562 Front surface of caulking head 563 Bottom surface of caulking head 6C Shaft unit 61 Shaft (shaft member)
62 Sleeve 621 Sleeve contact surface 622 Sleeve outer peripheral surface 623 Sleeve tapered surface 624 Sleeve friction surface 625 Sleeve end surface 62h Sleeve through hole 7 Motor stator 8 Motor 9 Supercharger 91 Turbine 911 Turbine housing 912 Turbine impeller 913 Inlet 914 Scroll flow Route 92 Compressor 921 Compressor housing 922 Compressor impeller
923 Suction port 924 Scroll passage 931 Thrust collar 94

Motor housing

951, 952

Bearing

961, 962 Air bearing 97 Spacer H Rotation axis

Claims

a magnet including a magnet circumferential surface and a pair of magnet end faces;
a shaft unit including a shaft end surface that comes into contact with the magnet end surface;
an armor ring that covers a portion where the magnet end surface is in contact with the shaft end surface and the magnet circumferential surface;
The shaft unit includes an insertion part covered by the armor ring, a protrusion part not covered by the armor ring, and a connecting part located between the insertion part and the protrusion part and in contact with an end of the armor ring. , including;
A motor rotor, wherein an end of the armor ring includes a caulked portion bent toward an axis of the shaft unit.
The motor rotor according to claim 1, wherein the connecting portion includes a tapered surface that contacts the caulking portion.
The armor ring includes a first accommodating part in which the magnet is accommodated, a second accommodating part in which the insertion part is arranged, and a third accommodating part in which the connecting part is arranged and includes a ring contact surface. including;
The motor rotor according to claim 1, wherein the connecting portion includes a shaft contact surface that contacts the ring contact surface along the axial direction of the shaft unit.
The motor rotor according to claim 3, wherein the connecting portion is sandwiched between the caulking portion and the ring contact surface.
The motor rotor according to claim 3 or 4, wherein the outer diameter of the shaft contact surface is larger than the outer diameter of the insertion portion.
The shaft end surface is an end surface of the insertion portion,
the first magnet end face faces the first shaft end face of the first shaft unit;
The motor rotor according to claim 1, wherein the second magnet end surface opposite to the first magnet end surface faces the second shaft end surface of the second shaft unit.
The magnet includes a magnet through hole that penetrates from the first magnet end surface to the second magnet end surface on the opposite side of the first magnet end surface,
The motor rotor according to claim 1, wherein the shaft unit includes a shaft member including a portion inserted into the protrusion and the magnet through hole, and a sleeve member including the connection portion.
The connecting portion includes a shaft groove,
The caulking portion includes a neck portion including a portion in contact with the connecting portion, and a head portion including a portion bent with respect to the neck portion and disposed in the shaft groove,
The motor rotor according to claim 1, wherein the head includes a surface that comes into contact with a surface forming the shaft groove.
motor rotor;
a motor stator including a coil disposed around the motor rotor;
The motor rotor is
a magnet including a circumferential magnet surface and a pair of magnet end faces;
a shaft unit including a shaft end surface that comes into contact with the magnet end surface;
an armor ring that covers a portion where the magnet end surface is in contact with the shaft end surface and the magnet circumferential surface,
The shaft unit includes an insertion part covered by the armor ring, a protrusion part not covered by the armor ring, and a connecting part located between the insertion part and the protrusion part and in contact with an end of the armor ring. , including;
The end of the armor ring includes a caulked portion bent toward the axis of the shaft unit.
motor and
an impeller rotated by the motor,
The motor is
motor rotor;
a motor stator including a coil disposed around the motor rotor;
The motor rotor is
a magnet including a circumferential magnet surface and a pair of magnet end faces;
a shaft unit including a shaft end surface that comes into contact with the magnet end surface;
an armor ring that covers a portion where the magnet end surface is in contact with the shaft end surface and the magnet circumferential surface,
The shaft unit includes an insertion part covered by the armor ring, a protrusion part not covered by the armor ring, and a connecting part located between the insertion part and the protrusion part and in contact with an end of the armor ring. , including;
In the supercharger, the end portion of the armor ring includes a caulked portion bent toward the axis of the shaft unit.