Electric working machine

Abstract

The electric working machine has a motor, a power transmission mechanism, and an output shaft. Among them, the motor has a stator and a rotor. The rotor is disposed inside the stator and can rotate about the rotation axis. The output shaft is for mounting a tip tool and is driven based on the power transmitted from the motor through the power transmission mechanism. The stator has a stator core and a plurality of coils. The stator core has an outer member and an inner member. Among them, the outer member has an annular portion and a plurality of protruding portions. The plurality of protruding portions protrude radially inward from the annular portion and are arranged at intervals in the circumferential direction for supporting the coils. The inner member is disposed inside the outer member and is connected to the inner ends of the protruding portions.

Description

Technical Field

[0001] The present invention relates to an electric working machine. Background Art

[0002] A brushless motor is used as a power source for an electric working machine such as an electric tool. A technique in which a stator core of a brushless motor has a split structure is disclosed in Patent Document 1. By making the stator core have a split structure, it is easy to wind a coil around the stator core. Therefore, the space factor of the coil is increased. By increasing the coil space factor, miniaturization and high output of the motor can be achieved.

[0003] [Prior Art Documents]

[0004] [Patent Documents]

[0005] Patent Document 1: Japanese Patent Application Laid-Open Publication No. 2019-004599 Summary of the Invention

[0006] [Technical Problem to be Solved by the Invention]

[0007] In a split structure in which a stator core is split according to teeth, a plurality of split structures each having teeth are generated. The stator core is formed by connecting together the plurality of split structures each having teeth. When connecting together the plurality of split structures each having teeth, the relative positions of the teeth may shift.

[0008] An object of the present invention is to increase the space factor of a coil while suppressing the shift of the relative positions of the teeth.

[0009] [Technical Solution for Solving the Technical Problem]

[0010] According to the present invention, there is provided an electric working machine having a motor, a power transmission mechanism, and an output shaft. The motor has a stator and a rotor, the rotor is disposed inside the stator and can rotate about a rotation axis; the output shaft is for mounting a tip tool and is driven based on power transmitted from the motor through the power transmission mechanism. The stator has a stator core and a plurality of coils. The stator core has an outer member and an inner member. The outer member has an annular portion and a plurality of protrusions. The plurality of protrusions project radially inward from the annular portion and are arranged at intervals in the circumferential direction for supporting the coils. The inner member is disposed inside the outer member and is connected to the inner ends of the protrusions.

[0011] [Advantages of the Invention]

[0012] According to the present invention, it is possible to suppress the deviation of the relative position of the teeth while increasing the duty factor of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. 1 is a side view of a power tool according to the present embodiment.

[0014] Figure 2 FIG. 2 is a perspective view of a stator according to the present embodiment.

[0015] Figure 3 FIG. 3 is a perspective view of an outer member according to the present embodiment.

[0016] Figure 4 FIG. 4 is a perspective view of a first insulator according to the present embodiment, viewed from the radially inner side.

[0017] Figure 5 FIG. 5 is a perspective view of the first insulator according to the present embodiment, viewed from the radially outer side.

[0018] Figure 6 FIG. 6 is a perspective view of the first insulator wound with a first coil according to the present embodiment.

[0019] Figure 7 FIG. 7 is a perspective view of a second insulator according to the present embodiment, viewed from the radially inner side.

[0020] Figure 8 FIG. 8 is a perspective view of the second insulator according to the present embodiment, viewed from the radially outer side.

[0021] Figure 9 FIG. 9 is a perspective view of the second insulator wound with a second coil according to the present embodiment.

[0022] Figure 10 FIG. 10 is a top view of an outer member on which the first insulator wound with the first coil and the second insulator wound with the second coil according to the present embodiment are mounted.

[0023] Figure 11 FIG. 11 is a perspective view of an outer member on which the first insulator wound with the first coil and the second insulator wound with the second coil according to the present embodiment are mounted.

[0024] Figure 12 FIG. 12 is a perspective view of an inner member according to the present embodiment.

[0025] Figure 13 FIG. 13 is a perspective view of an inner member provided with a resin layer according to the present embodiment.

[0026] Figure 14This is a perspective view showing the locking member according to the present embodiment.

[0027] Figure 15 This is a perspective view showing the state in which the outer member and the inner member according to the present embodiment are connected together.

[0028] Figure 16 This is a perspective view showing the state in which the locking member is provided on the outer member and the inner member according to the present embodiment.

[0029] Figure 17 This is an enlarged view of the main part of the locking member according to the present embodiment.

[0030] Figure 18 This is a perspective view showing the short - circuit member, the inner member provided with a coil, and the outer member according to the present embodiment.

[0031] Figure 19 This is an exploded perspective view of the short - circuit member according to the present embodiment. Detailed Embodiment

[0032] Hereinafter, while referring to the attached Figure 1 the embodiments of the present invention will be described, but the present invention is not limited thereto. The structural elements of the embodiments described below can be appropriately combined. In addition, sometimes some structural elements are not used.

[0033] In the embodiments, the terms left, right, front, rear, up, and down are used to describe the positional relationships of the respective parts. These terms represent relative positions or directions based on the center of the power - operated machine. The power - operated machine includes a power tool having a motor.

[0034] In the embodiments, the direction parallel to the rotation axis AX of the motor is appropriately referred to as the axial direction, the radial direction of the rotation axis AX of the motor is appropriately referred to as the radial direction, and the direction of rotation around the rotation axis AX of the motor is appropriately referred to as the circumferential direction. In addition, in the radial direction, the position closer to the rotation axis AX of the motor or the direction approaching the rotation axis AX of the motor is appropriately referred to as the radially inner side, and the position farther from the rotation axis AX of the motor or the direction away from the rotation axis AX of the motor is appropriately referred to as the radially outer side.

[0035] [Power Tool]

[0036] Figure 1 This is a side view showing the power tool 1 according to the present embodiment. In the present embodiment, the power tool 1 is a percussion driver drill. As Figure 1As shown, the power tool 1 has a handle housing 2, a main body housing 3, an output shaft 6, and a battery mounting portion 7. Among them, the main body housing 3 is disposed above the handle housing 2 and is used to house the motor 8 and the power transmission mechanism 10; the output shaft 6 projects forward from the main body housing 3; the battery mounting portion 7 is disposed at the lower part of the handle housing 2.

[0037] The handle housing 2 is for the operator to hold. The handle housing 2 projects downward from the lower part of the main body housing 3. The handle housing 2 is made of synthetic resin.

[0038] The main body housing 3 includes a motor housing 4 and a gear housing 5 disposed in front of the motor housing 4. The output shaft 6 projects forward from the gear housing 5.

[0039] The motor housing 4 is used to house the motor 8. The motor housing 4 is cylindrical. The motor 8 is disposed in the internal space of the motor housing 4. The motor housing 4 and the handle housing 2 are integral. The motor housing 4 is made of synthetic resin. A rear cover 9 is provided at the rear of the motor housing 4. The rear cover 9 covers the opening at the rear of the motor housing 4. The rear cover 9 is made of synthetic resin.

[0040] The motor housing 4 has an air inlet 3a. The rear cover 9 has an air outlet 3b. The air outlet 3b is provided behind the air inlet 3a. The air inlet 3a connects the internal space and the external space of the main body housing 3. The air outlet 3b connects the internal space and the external space of the main body housing 3. The air inlets 3a are respectively provided at the left and right parts of the motor housing 4. The air outlets 3b are respectively provided at the left and right parts of the rear cover 9. The air in the external space of the main body housing 3 flows into the internal space of the main body housing 3 through the air inlets 3a. The air in the internal space of the main body housing 3 flows out to the external space of the main body housing 3 through the air outlets 3b.

[0041] The gear housing 5 houses the power transmission mechanism 10 including a plurality of gears. The gear housing 5 is cylindrical. The power transmission mechanism 10 is disposed in the internal space of the gear housing 5. The gear housing 5 is made of aluminum (Aluminium).

[0042] The output shaft 6 can mount a tip tool. A tip tool, such as a drill bit, is mounted on the output shaft 6. The output shaft 6 includes a main shaft and a chuck, wherein the main shaft rotates by the power generated by the motor 8, and the chuck can hold the tip tool.

[0043] The battery mounting portion 7 is connected to the battery pack 11. The battery mounting portion 7 is provided at the lower part of the handle housing 2. The battery pack 11 can be disassembled and assembled relative to the battery mounting portion 7. The battery pack 11 includes a secondary battery. In this embodiment, the battery pack 11 includes a rechargeable lithium-ion battery. By being mounted on the battery mounting portion 7, the battery pack 11 can supply electric power to the power tool 1.

[0044] The electric motor 8 generates power for driving the output shaft 6. The electric power supplied from the battery pack 11 is used to drive the electric motor 8. The power transmission mechanism 10 transmits the power generated by the electric motor 8 to the output shaft 6. The output shaft 6 is driven using the power transmitted from the electric motor 8 through the power transmission mechanism 10.

[0045] The power tool 1 has a trigger switch 12, a forward / reverse switching operating lever 13, a speed switching operating lever 14, a mode switching ring 15, a switching ring 16, a lamp 17, and a controller 18.

[0046] The trigger switch 12 is provided on the handle housing 2. The trigger switch 12 projects forward from the upper part of the front portion of the handle housing 2. The trigger switch 12 is operated by the operator. The operator can operate the trigger switch 12 with a finger while holding the handle housing 2 with one of the left and right hands. By operating the trigger switch 12, electric power is supplied from the battery pack 11 to the electric motor 8, thereby driving the electric motor 8. By operating the trigger switch 12, the driving and stopping of the electric motor 8 can be switched.

[0047] The forward / reverse switching operating lever 13 is provided on the upper part of the side portion of the handle housing 2. The forward / reverse switching operating lever 13 is operated by the operator. By operating the forward / reverse switching operating lever 13, the rotation direction of the electric motor 8 is switched. The operator can switch the rotation direction of the electric motor 8 from one of the forward rotation direction and the reverse rotation direction to the other by operating the forward / reverse switching operating lever 13. The rotation direction of the output shaft 6 is switched by switching the rotation direction of the electric motor 8.

[0048] The speed switching operating lever 14 is provided on the upper part of the main body housing 3. The speed switching operating lever 14 is operated by the operator. By operating the speed switching operating lever 14, the rotation speed of the output shaft 6 can be switched. The operator can switch the rotation speed of the output shaft 6 from one of the first speed and the second speed to the other by operating the speed switching operating lever 14, where the second speed is higher than the first speed.

[0049] The mode switching ring 15 is disposed in front of the gear housing 5. The mode switching ring 15 is operated by the operator. By operating the mode switching ring 15, the operation mode of the power tool 1 is switched.

[0050] The operation modes of the power tool 1 include a vibration mode in which the output shaft 6 vibrates in the front-rear direction and a non-vibration mode in which the output shaft 6 does not vibrate in the front-rear direction. The non-vibration mode includes a drill mode and a clutch mode, where the drill mode is a mode in which power is transmitted to the output shaft 6 regardless of the rotational load acting on the output shaft 6; the clutch mode is a mode in which the power transmitted to the output shaft 6 is blocked according to the rotational load acting on the output shaft 6.

[0051] The switching ring 16 is disposed in front of the mode switching ring 15. The switching ring 16 is for the operator to operate. In the clutch mode, by operating the switching ring 16, a release value can be set, which is used to block the power transmitted to the output shaft 6. The release value is a value related to the rotational load acting on the output shaft 6. When the rotational load acting on the output shaft 6 reaches the release value, the power transmitted to the output shaft 6 is blocked.

[0052] The lamp 17 is provided at the upper part of the front portion of the grip portion 2. The lamp 17 emits illumination light that illuminates the front of the power tool 1. The lamp 17 includes, for example, a light emitting diode (LED: Light Emitting Diode).

[0053] The controller 18 outputs a control signal for controlling the power tool 1. The controller 18 is housed in the handle housing 2. The controller 18 is disposed in the lower part of the internal space of the handle housing 2.

[0054] [Motor]

[0055] The motor 8 is a brushless motor. The motor 8 is an inner rotor type motor and has a cylindrical stator 21 and a rotor 23 disposed inside the stator 21. The rotor 23 has a rotating shaft 22 extending in the axial direction. The rotor 23 can rotate about the rotation axis AX.

[0056] [Stator]

[0057] Figure 2 is a perspective view showing the stator 21 according to the present embodiment. As Figure 1 and Figure 2 shown, the stator 21 has a stator core 31, a first insulator 32, a second insulator 33, a coil 34, and a short - circuit member 35. In the present embodiment, the stator 21 has six coils 34.

[0058] The stator core 31 is made of a metal mainly composed of iron. The stator core 31 has an outer member 40 and an inner member 43 disposed inside the outer member 40. The outer member 40 has an annular portion 41 and a plurality of protruding portions 42. The annular portion 41 is cylindrical. The plurality of protruding portions 42 respectively protrude radially inward from the inner surface of the annular portion 41. The plurality of protruding portions 42 are arranged at intervals in the circumferential direction. In the present embodiment, six protruding portions 42 are provided. The plurality of protruding portions 42 respectively support the coil 34. The annular portion 41 and the protruding portions 42 are integral. That is, the annular portion 41 and the protruding portions 42 are one member. The inner member 43 is cylindrical. The inner member 43 is disposed radially inside the outer member 40. The inner member 43 is connected to the inner end portions of the respective protruding portions among the plurality of protruding portions 42.

[0059] The first insulator 32 and the second insulator 33 are electrically insulating components made of synthetic resin. In the present embodiment, three first insulators 32 are provided. Three second insulators 33 are provided. The first insulator 32 and the second insulator 33 are respectively disposed around the protrusion 42. The first insulator 32 and the second insulator 33 are alternately arranged in the circumferential direction. The first insulator 32 and the second insulator 33 can be separated from the outer member 40 respectively.

[0060] The coils 34 are respectively wound around the first insulator 32 and the second insulator 33. In the present embodiment, six coils 34 are provided. Three of the six protrusions 42 support the coil 34 through the first insulator 32. Three of the six protrusions 42 support the coil 34 through the second insulator 33. In the following description, the coil 34 supported by the first insulator 32 is appropriately referred to as the first coil 341, and the coil 34 supported by the second insulator 33 is appropriately referred to as the second coil 342.

[0061] Figure 3 is a perspective view showing the outer member 40 according to the present embodiment. The outer member 40 has an annular portion 41 and a protrusion 42. The annular portion 41 is disposed around the rotation axis AX. The annular portion 41 is cylindrical.

[0062] The protrusion 42 projects radially inward from the inner surface of the annular portion 41. The protrusions 42 are arranged at equal intervals in the circumferential direction. Six protrusions 42 are provided. The protrusions 42 are arranged at intervals of 60° in the circumferential direction.

[0063] The protrusion 42 is integral with the annular portion 41. The outer member 40 includes a plurality of steel plates laminated in the axial direction. The steel plate is a plate made of a metal mainly composed of iron. The outer member 40 is formed by laminating a plurality of steel plates.

[0064] The width of the protrusion 42 gradually decreases as it approaches the radially inner side from the inner surface of the annular portion 41. The width of the protrusion 42 refers to the dimension of the protrusion 42 in the circumferential direction. An inclined portion 41a is provided on the inner surface of the annular portion 41. The inclined portion 41a is adjacent to the side surface of the protrusion 42. The inclined portion 41a inclines radially inward as it approaches the side surface of the protrusion 42. The inclined portion 41a is provided on both sides in the circumferential direction of the protrusion 42 on the inner surface of the annular portion 41. The distance between the protrusions 42 adjacent to each other in the circumferential direction becomes shorter as it approaches the radially inner side. The protrusion 42 has a engaging groove portion 42a. The engaging groove portion 42a is provided at the inner end portion of the protrusion 42. The engaging groove portion 42a extends along the axial direction. Openings are provided at both axial ends of the engaging groove portion 42a. The openings of the engaging groove portion 42a are provided on the axial end surfaces of the protrusion 42. That is, both axial ends of the engaging groove portion 42a are open.

[0065] Axially, the outer member 40 has a constant dimension. The end face of the outer member 40 in the axial direction is orthogonal to the rotation axis AX. The end face of the annular portion 41 in the axial direction and the end face of the protrusion portion 42 in the axial direction are arranged in the same plane.

[0066] Figure 4 It is a perspective view of the first insulator 32 according to the present embodiment as viewed from the radially inner side. Figure 5 It is a perspective view of the first insulator 32 according to the present embodiment as viewed from the radially outer side. Figure 6 It is a perspective view showing the first insulator 32 around which the first coil 341 according to the present embodiment is wound.

[0067] The first insulator 32 is disposed around the protrusion portion 42. The first insulator 32 has a cylindrical portion 51, an outer wall portion 52, and an inner wall portion 53. The outer wall portion 52 is provided at the radially outer end of the cylindrical portion 51. The inner wall portion 53 is provided at the radially inner end of the cylindrical portion 51. The cylindrical portion 51, the outer wall portion 52, and the inner wall portion 53 are integral (one member).

[0068] The cylindrical portion 51 is cylindrical. The cross section of the cylindrical portion 51 is quadrilateral. The cylindrical portion 51 has a through hole 54 for inserting the protrusion portion 42. The cylindrical portion 51 is disposed around the protrusion portion 42. The through hole 54 extends along the radial direction. In a state where the protrusion portion 42 is inserted into the through hole 54, the cylindrical portion 51 is disposed around the protrusion portion 42.

[0069] The radially outer end of the first insulator 32 is connected to the annular portion 41 of the outer member 40. The radially inner end of the first insulator 32 is connected to the inner member 43. In the present embodiment, the outer wall portion 52 is connected to the annular portion 41 of the outer member 40, and the inner wall portion 53 is connected to the inner member 43. The radially outer end of the cylindrical portion 51 is connected to the annular portion 41 of the outer member 40 through the outer wall portion 52. The radially inner end of the cylindrical portion 51 is connected to the inner member 43 through the inner wall portion 53.

[0070] In the first insulator 32, the outer wall portion 52 has a larger dimension in the circumferential direction than the inner wall portion 53 in the circumferential direction. The outer wall portion 52 has thin wall portions 55 provided at both ends in the circumferential direction of the outer wall portion 52. In the outer wall portion 52, the thin wall portion 55 has a smaller dimension in the radial direction than the portion other than the thin wall portion 55 in the radial direction. The thin wall portion 55 extends along the axial direction. In addition, the outer wall portion 52 has an inclined portion 56 provided on the outer surface of the outer wall portion 52. The inclined portion 56 inclines radially inward as it approaches the inner surface of the cylindrical portion 51 (the inner surface of the through hole 54). The inclined portion 56 is provided on both sides in the circumferential direction of the through hole 54 on the outer surface of the outer wall portion 52. In addition, the outer wall portion 52 has a notch portion 57 and a notch portion 58 provided at the upper end portion of the outer wall portion 52. One end portion of the first coil 341 is disposed in the notch portion 57, and the other end portion of the first coil 341 is disposed in the notch portion 58. In addition, the outer wall portion 52 has a locking portion 59 and a locking portion 60, wherein the locking portion 59 is disposed radially outside the notch portion 57, and the locking portion 60 is disposed radially outside the notch portion 58. The locking portion 59 holds one end portion of the first coil 341. The locking portion 60 holds the other end portion of the first coil 341. The end portions of the first coil 341 are respectively locked to the locking portion 59 and the locking portion 60.

[0071] The inner wall portion 53 has thin wall portions 61 provided at both ends in the circumferential direction of the inner wall portion 53. In the inner wall portion 53, the thin wall portion 61 has a smaller dimension in the radial direction than the portion other than the thin wall portion 61 in the radial direction. The thin wall portion 61 extends along the axial direction. In addition, the inner wall portion 53 has a communication groove portion 62 provided on the inner surface of the inner wall portion 53. The communication groove portion 62 is formed on the other side in the axial direction of the through hole 54. The communication groove portion 62 extends along the axial direction. Openings are provided at both ends in the axial direction of the communication groove portion 62. The openings of the communication groove portion 62 are provided on the inner surface in the axial direction of the through hole 54 and the end surface in the axial direction of the inner wall portion 53. That is, both ends in the axial direction of the communication groove portion 62 are open. In a state where the protrusion portion 42 is inserted into the through hole 54 of the first insulator 32, the communication groove portion 62 and the engaging groove portion 42a are connected together. No step (no height difference) is provided between the communication groove portion 62 and the engaging groove portion 42a.

[0072] The inner wall portion 53 has a locking groove portion 63 provided on the inner surface of the inner wall portion 53. The locking groove portion 63 is formed on the other side in the axial direction of the through hole 54. The locking groove portion 63 extends along the circumferential direction in a manner intersecting the communication groove portion 62. The locking groove portion 63 is provided on both sides in the circumferential direction of the communication groove portion 62. The depth (dimension in the radial direction) of the locking groove portion 63 is shallower than the depth of the communication groove portion 62.

[0073] The first coil 341 is disposed around the cylindrical portion 51. The protrusion 42 supports the first coil 341 via the first insulator 32. In a plane orthogonal to the rotation axis AX, the outer shape of the first coil 341 disposed around the cylindrical portion 51 is trapezoidal. The dimension of the outer shape of the first coil 341 in the circumferential direction gradually increases as it approaches the radially inner side. Further, the dimension of the outer shape of the first coil 341 in the axial direction gradually increases as it approaches the radially inner side. One end of the first coil 341 passes through the notch portion 57 of the outer wall portion 52 and is locked to the locking portion 59. The other end of the first coil 341 passes through the notch portion 58 of the outer wall portion 52 and is locked to the locking portion 60.

[0074] In the case where the first coil 341 is wound around the cylindrical portion 51 in a nozzle manner, one end of the wire material fed out from the nozzle is locked to the locking portion 59. In a state where one end of the wire material is locked to the locking portion 59, the nozzle feeds out the wire material while surrounding the periphery of the cylindrical portion 51. By surrounding the periphery of the cylindrical portion 51 while feeding out the wire material from the nozzle, the first coil 341 is disposed around the cylindrical portion 51. After the first coil 341 is disposed around the cylindrical portion 51, the other end of the wire material is locked to the locking portion 60.

[0075] The end of the first coil 341 locked to the locking portion 59 is the starting end of the winding of the first coil 341. The end of the first coil 341 locked to the locking portion 60 is the ending end of the winding of the first coil 341.

[0076] Figure 7 is a perspective view of the second insulator 33 according to the present embodiment as viewed from the radially inner side. Figure 8 is a perspective view of the second insulator 33 according to the present embodiment as viewed from the radially outer side. Figure 9 is a perspective view showing the second insulator 33 around which the second coil 342 is wound according to the present embodiment.

[0077] The second insulator 33 is disposed around the protrusion 42. The second insulator 33 has a cylindrical portion 71, an outer wall portion 72, and an inner wall portion 73. The outer wall portion 72 is provided at the radially outer end of the cylindrical portion 71. The inner wall portion 73 is provided at the radially inner end of the cylindrical portion 71. The cylindrical portion 71, the outer wall portion 72, and the inner wall portion 73 are integral (one component).

[0078] The cylindrical portion 71 is cylindrical. The cross section of the cylindrical portion 71 is quadrilateral. The cylindrical portion 71 has a through hole 74 into which the protrusion 42 is inserted. The cylindrical portion 71 is disposed around the protrusion 42. The through hole 74 extends along the radial direction. In a state where the protrusion 42 is inserted into the through hole 74, the cylindrical portion 71 is disposed around the protrusion 42.

[0079] The radially outer end of the second insulator 33 is connected to the annular portion 41 of the outer member 40. The radially inner end of the second insulator 33 is connected to the inner member 43. In the present embodiment, the outer wall portion 72 is connected to the annular portion 41 of the outer member 40, and the inner wall portion 73 is connected to the inner member 43. The radially outer end of the cylindrical portion 71 is connected to the annular portion 41 of the outer member 40 through the outer wall portion 72. The radially inner end of the cylindrical portion 71 is connected to the inner member 43 through the inner wall portion 73.

[0080] In the second insulator 33, the dimension of the outer wall portion 72 in the circumferential direction is smaller than the dimension of the inner wall portion 73 in the circumferential direction. The outer wall portion 72 has thin wall portions 75 provided at both ends in the circumferential direction of the outer wall portion 72. In the outer wall portion 72, the dimension of the thin wall portion 75 in the radial direction is smaller than the dimension of the portion other than the thin wall portion 75 in the radial direction. The thin wall portion 75 extends along the axial direction. In addition, the outer wall portion 72 has an inclined portion 76 provided on the outer surface of the outer wall portion 72. The inclined portion 76 inclines radially inward as it approaches the inner surface of the cylindrical portion 71 (the inner surface of the through hole 74). The inclined portion 76 is provided on both sides in the circumferential direction of the through hole 74 on the outer surface of the outer wall portion 72. In addition, the outer wall portion 72 has a notch portion 77 and a notch portion 78 provided at the upper end portion of the outer wall portion 72. One end of the second coil 342 is disposed in the notch portion 77, and the other end of the second coil 342 is disposed in the notch portion 78. In addition, the outer wall portion 72 has a locking portion 79 and a locking portion 80, wherein the locking portion 79 is disposed radially outside the notch portion 77, and the locking portion 80 is disposed radially outside the notch portion 78. The locking portion 79 holds one end of the second coil 342. The locking portion 80 holds the other end of the second coil 342. The ends of the second coil 342 are respectively locked to the locking portion 79 and the locking portion 80.

[0081] The inner wall portion 73 has thin wall portions 81 provided at both ends in the circumferential direction of the inner wall portion 73. In the inner wall portion 73, the dimension of the thin wall portion 81 in the radial direction is smaller than the dimension of the portion other than the thin wall portion 81 in the radial direction. The thin wall portion 81 extends along the axial direction. In addition, the inner wall portion 73 has a communication groove portion 82 provided on the inner surface of the inner wall portion 73. The communication groove portion 82 is formed on the other side in the axial direction of the through hole 74. The communication groove portion 82 extends along the axial direction. Openings are provided at both ends in the axial direction of the communication groove portion 82. The openings of the communication groove portion 82 are provided on the inner surface in the axial direction of the through hole 74 and the end surface in the axial direction of the inner wall portion 73. That is, both ends in the axial direction of the communication groove portion 82 are open. In a state where the protrusion portion 42 is inserted into the through hole 74 of the second insulator 33, the communication groove portion 82 and the engaging groove portion 42a are connected together. No step is provided between the communication groove portion 82 and the engaging groove portion 42a.

[0082] The inner wall portion 73 has a locking groove portion 83 provided on the inner surface of the inner wall portion 73. The locking groove portion 83 is formed on the other side in the axial direction of the through hole 74. The locking groove portion 83 extends circumferentially in a manner intersecting the communication groove portion 82. The locking groove portion 83 is provided on both sides of the communication groove portion 82 in the circumferential direction. The depth (dimension in the radial direction) of the locking groove portion 83 is shallower than the depth of the communication groove portion 82.

[0083] The second coil 342 is disposed around the cylindrical portion 71. The protrusion portion 42 supports the second coil 342 through the second insulator 33. In a plane orthogonal to the rotation axis AX, the outer shape of the second coil 342 disposed around the cylindrical portion 71 is rectangular. The dimension of the outer shape of the second coil 342 in the circumferential direction is substantially constant in the radial direction. In addition, the dimension of the outer shape of the second coil 342 in the axial direction is substantially constant in the radial direction. One end of the second coil 342 passes through the notch portion 77 of the outer wall portion 72 and is locked to the locking portion 79. The other end of the second coil 342 passes through the notch portion 78 of the outer wall portion 72 and is locked to the locking portion 80.

[0084] In the case where the second coil 342 is wound around the cylindrical portion 71 in a nozzle manner, one end of the wire material sent out from the nozzle is locked to the locking portion 79. While the nozzle feeds out the wire material, the nozzle surrounds the periphery of the cylindrical portion 71 in a state where one end of the wire material is locked to the locking portion 79. By surrounding the periphery of the cylindrical portion 71 with the nozzle in a state where the wire material is fed out from the nozzle, the second coil 342 is disposed around the cylindrical portion 71. After the second coil 342 is disposed around the cylindrical portion 71, the other end of the wire material is locked to the locking portion 80.

[0085] The end of the second coil 342 locked to the locking portion 79 is the starting end of the winding of the second coil 342. The end of the second coil 342 locked to the locking portion 80 is the ending end of the winding of the second coil 342.

[0086] As Figure 6 and Figure 9 shown, the first insulator 32 and the second insulator 33 are wound with the coil 34 in a state of not being mounted on the outer member 40. In the case where the first coil 341 is wound around the cylindrical portion 51 in a nozzle manner, the first insulator 32 is held by a predetermined jig, and the nozzle capable of feeding out the wire material surrounds the periphery of the cylindrical portion 51 while feeding out the wire material. By surrounding the periphery of the cylindrical portion 51 with the nozzle in a state where the wire material is fed out from the nozzle, the first coil 341 is disposed around the cylindrical portion 51 of the first insulator 32. The same applies to the case where the second coil 342 is wound around the cylindrical portion 71 of the second insulator 33 in a nozzle manner.

[0087] In addition, the winding method is not limited to the nozzle method. As a winding method of the coil 34 different from the nozzle method, a flyer method can be exemplified.

[0088] In the present embodiment, since the first coil 341 can be wound around the first insulator 32 before the first insulator 32 is mounted on the outer member 40, the nozzle or the operator can freely approach the first coil 341. Therefore, the outer shape of the first coil 341 can be easily formed. Since the outer shape of the first coil 341 can be easily formed, the outer shape of the first coil 341 can be optimized to increase the duty factor. In addition, together with the formation of the first coil 341, a coating agent can be easily applied to the first coil 341. As the coating agent, a protective agent that improves at least one of the durability, dust resistance, and waterproofness of the first coil 341 can be exemplified. In addition, by applying the coating agent to the first coil 341, deformation of the first coil 341 can be suppressed. The same applies to the second coil 342 wound around the second insulator 33.

[0089] Figure 10 FIG. is a plan view showing an outer member 40 to which the first insulator 32 wound with the first coil 341 and the second insulator 33 wound with the second coil 342 according to the present embodiment are mounted.

[0090] As Figure 10 shown, a plurality of first insulators 32 and a plurality of second insulators 33 are provided on the outer member 40 of the stator core 31. The plurality of first insulators 32 and the plurality of second insulators 33 are arranged along the circumferential direction on the outer member 40 of the stator core 31.

[0091] In the present embodiment, three first insulators 32 are mounted on the protrusion 42 in a state where the first coil 341 is wound around the cylindrical portion 51. The first insulator 32 is mounted on the protrusion 42 by inserting the protrusion 42 into the through hole 54 of the cylindrical portion 51. In addition, three second insulators 33 are mounted on the protrusion 42 in a state where the second coil 342 is wound around the cylindrical portion 71. The second insulator 33 is mounted on the protrusion 42 by inserting the protrusion 42 into the through hole 74 of the cylindrical portion 71. The first coil 341 and the outer member 40 are electrically insulated by the first insulator 32. The second coil 342 and the outer member 40 are electrically insulated by the second insulator 33.

[0092] In the outer member 40, the first insulator 32 and the second insulator 33 are respectively mounted on the protrusion 42 in such a manner that the first insulator 32 and the second insulator 33 are alternately arranged in the circumferential direction.

[0093] In a state where a plurality of first insulators 32 and a plurality of second insulators 33 are alternately arranged in the circumferential direction, a plurality of outer wall portions 52 and a plurality of outer wall portions 72 are connected together to form an outer cylindrical portion 110. Further, in a state where a plurality of first insulators 32 and a plurality of second insulators 33 are alternately arranged in the circumferential direction, a plurality of inner wall portions 53 and a plurality of inner wall portions 73 are connected together to form an inner cylindrical portion 120.

[0094] Adjacent outer wall portions 52 and 72 are connected together at thin wall portions 55 and 75. Adjacent inner wall portions 53 and 73 are connected together at thin wall portions 61 and 81.

[0095] The outer surface of the outer wall portion 52 of the first insulator 32 is in close contact with the inner surface of the annular portion 41. The outer surface of the outer wall portion 72 of the second insulator 33 is in close contact with the inner surface of the annular portion 41. The inclined portion 56 of the first insulator 32 is in close contact with the inclined portion 41a of the annular portion 41. The inclined portion 76 of the second insulator 33 is in close contact with the inclined portion 41a of the annular portion 41. Accordingly, the first insulator 32 and the second insulator 33 are respectively positioned in the axial direction and the circumferential direction with respect to the outer member 40.

[0096] Figure 11 It is a perspective view showing an outer member 40 on which a first insulator 32 wound with a coil 34 and a second insulator 33 wound with a coil 34 according to the present embodiment are mounted.

[0097] As Figure 11 shown, the protrusion 42 has an engaging groove portion 42a extending along the axial direction. The engaging groove portion 42a is provided at the inner end portion of the protrusion 42. Three protrusions 42 are respectively inserted into the through holes 54 of the first insulator 32. Three protrusions 42 are respectively inserted into the through holes 74 of the second insulator 33. In a state where the protrusion 42 is inserted into the through hole 54 of the first insulator 32, the engaging groove portion 42a faces the space inside the outer member 40. Similarly, in a state where the protrusion 42 is inserted into the through hole 74 of the second insulator 33, the engaging groove portion 42a faces the space inside the outer member 40.

[0098] In the protrusion 42 inserted into the through hole 54 of the first insulator 32, a communication groove portion 62 is arranged at the other end portion in the axial direction of the engaging groove portion 42a. The communication groove portion 62 communicates with the engaging groove portion 42a in the axial direction. No step is provided between the inner surface of the engaging groove portion 42a and the inner surface of the communication groove portion 62. By arranging the communication groove portion 62 at the other end portion in the axial direction of the engaging groove portion 42a, the other end portion of the engaging groove portion 42a is open.

[0099] The inner surface of the through hole 54 is disposed at one axial end of the engaging groove portion 42a. By disposing the inner surface of the through hole 54 at one axial end of the engaging groove portion 42a, one end of the engaging groove portion 42a is closed. The inner surface of the through hole 54 functions as a stopper for blocking one end of the engaging groove portion 42a.

[0100] In the protrusion portion 42 inserted into the through hole 74 of the second insulator 33, a communication groove portion 82 is disposed at the other axial end of the engaging groove portion 42a. The communication groove portion 82 communicates with the engaging groove portion 42a in the axial direction. No step is provided between the inner surface of the engaging groove portion 42a and the inner surface of the communication groove portion 82. By disposing the communication groove portion 82 at the other axial end of the engaging groove portion 42a, the other end of the engaging groove portion 42a is opened.

[0101] The inner surface of the through hole 74 is disposed at one axial end of the engaging groove portion 42a. By disposing the inner surface of the through hole 74 at one axial end of the engaging groove portion 42a, one end of the engaging groove portion 42a is closed. The inner surface of the through hole 74 functions as a stopper for blocking one end of the engaging groove portion 42a.

[0102] In addition, the locking groove portion 63 of the first insulator 32 and the locking groove portion 83 of the second insulator 33 communicate with each other in the circumferential direction in a region other than the communication groove portion 62 and the communication groove portion 82.

[0103] Figure 12 It is a perspective view showing the inner member 43 according to the present embodiment. Figure 13 It is a perspective view showing the inner member 43 provided with the resin layer 92 according to the present embodiment.

[0104] The inner member 43 includes a plurality of steel plates laminated in the axial direction. The steel plate is a plate made of a metal mainly composed of iron. The inner member 43 is formed by laminating a plurality of steel plates. The inner member 43 is disposed around the rotation axis AX. The inner member 43 is cylindrical.

[0105] In the axial direction, the size of the inner member 43 is constant. The end surface of the inner member 43 in the axial direction is orthogonal to the rotation axis AX. In the present embodiment, the size of the outer member 40 in the axial direction is the same as the size of the inner member 43 in the axial direction.

[0106] As Figure 12 shown, the inner member 43 has a plurality of narrow portions 91 provided at intervals in the circumferential direction. In the inner member 43, the size of the narrow portion 91 in the axial direction is smaller than the size of the portion other than the narrow portion 91 in the axial direction. In addition, in the inner member 43, the size of the narrow portion 91 in the radial direction is smaller than the size of the portion other than the narrow portion 91 in the radial direction.

[0107] In addition, it is also possible that in the inner member 43, the dimension of the narrow portion 91 in the axial direction is smaller than the dimension of the portion other than the narrow portion 91 in the axial direction, and the dimension of the narrow portion 91 in the radial direction is the same as the dimension of the portion other than the narrow portion 91 in the radial direction. In addition, it is also possible that in the inner member 43, the dimension of the narrow portion 91 in the radial direction is smaller than the dimension of the portion other than the narrow portion 91 in the radial direction, and the dimension of the narrow portion 91 in the axial direction is the same as the dimension of the portion other than the narrow portion 91 in the axial direction.

[0108] As Figure 13 shown, a resin layer 92 is provided on the narrow portion 91. The resin layer 92 is arranged so as to cover the surface of the narrow portion 91. The resin layer 92 is provided on the narrow portion 91 in such a manner that the surface of the resin layer 92 and the surface of the inner member 43 around the resin layer 92 are arranged in the same plane.

[0109] The inner member 43 has a plurality of engaging convex portions 93 provided at intervals in the circumferential direction. The engaging convex portions 93 are provided on the outer surface of the inner member 43. In the present embodiment, six engaging convex portions 93 are provided in the circumferential direction.

[0110] The engaging convex portions 93 project radially outward from the outer surface of the inner member 43. The engaging convex portions 93 extend along the axial direction. The engaging convex portions 93 engage with the engaging groove portions 42a of the protruding portions 42. In addition, the engaging convex portions 93 engage with the communication groove portions 62 of the first insulator 32 and the communication groove portions 82 of the second insulator 33. The position of the engaging convex portions 93 in the circumferential direction is determined according to the positions of the engaging groove portions 42a, the communication groove portions 62, and the communication groove portions 82 in the circumferential direction. The narrow portion 91 and the resin layer 92 are provided between the engaging convex portions 93 adjacent to each other in the circumferential direction.

[0111] Figure 14 is a perspective view showing the locking member 95 according to the present embodiment. As Figure 14 shown, the locking member 95 is a ring shape that is partially broken. The locking member 95 has a ring portion 96 provided at one end portion in the circumferential direction and a pointed portion 97 provided at the other end portion in the circumferential direction. The locking member 95 is locked to the locking groove portions 63 of the first insulator 32 and the locking groove portions 83 of the second insulator 33. The dimension of the locking member 95 in the circumferential direction is smaller than the dimensions of the locking groove portions 63 and 83 in the circumferential direction. The locking member 95 is an elastic member. In a state where no external force is applied, the outer diameter of the locking member 95 is larger than the inner diameters of the locking groove portions 63 and 83. The locking member 95 is locked to the locking groove portions 63 and 83 by an elastic force.

[0112] Figure 15 is a perspective view showing a state in which the outer member 40 and the inner member 43 according to the present embodiment are connected together.Figure 16 It is a perspective view showing a state in which a locking member 95 is provided on the outer member 40 and the inner member 43 according to the present embodiment. Figure 17 It is an enlarged view of the main part of the locking member 95 according to the present embodiment. In addition, in Figure 17 the illustration of the coil 34 is omitted.

[0113] As Figure 15 shown, the inner member 43 is inserted into the inside of the outer member 40 from the other side in the axial direction. The three engaging convex portions 93 of the inner member 43 are inserted into the engaging groove portion 42a through the communication groove portion 62. Since the other end portion of the engaging groove portion 42a in the axial direction is open, the engaging convex portion 93 can be inserted into the engaging groove portion 42a from the other side in the axial direction. The engaging convex portion 93 is fitted into the engaging groove portion 42a. Similarly, the three engaging convex portions 93 of the inner member 43 are inserted into the engaging groove portion 42a through the communication groove portion 82.

[0114] At the protrusion 42 inserted into the through hole 54 of the first insulator 32, one end portion of the engaging groove portion 42a in the axial direction is blocked by the inner surface of the through hole 54. The engaging convex portion 93 is axially positioned by contacting the inner surface of the through hole 54. Similarly, at the protrusion 42 inserted into the through hole 74 of the second insulator 33, one end portion of the engaging groove portion 42a in the axial direction is blocked by the inner surface of the through hole 74. The engaging convex portion 93 is axially positioned by contacting the inner surface of the through hole 74.

[0115] After the engaging convex portion 93 is fitted into the engaging groove portion 42a (refer to Figure 11 etc.) and the inner member 43 is connected to the outer member 40, the locking member 95 is disposed in the locking groove portion 63 and the locking groove portion 83. The locking member 95 is disposed to prevent the engaging convex portion 93 from coming off from the other end portion of the engaging groove portion 42a. The locking member 95 is locked to the locking groove portion 63 and the locking groove portion 83 so as to block the other end portion of the engaging groove portion 42a. The engaging convex portion 93 is prevented from coming off from the other end portion of the engaging groove portion 42a by the locking member 95.

[0116] When the engaging convex portion 93 of the inner member 43 is fitted into the engaging groove portion 42a of the protrusion 42 (refer to Figure 11 etc.), the outer surface of the inner member 43 is in close contact with the inner surface of the first insulator 32 and the inner surface of the second insulator 33. Thereby, the first insulator 32 and the second insulator 33 are prevented from coming off from the protrusion 42.

[0117] The end face on the axially upper side of the inner member 43 contacts the inner surfaces of the through holes 54 and 74 that function as stopper portions. The end face on the axially lower side of the inner member 43 contacts the locking member 95 disposed in the locking groove portions 63 and 83. Accordingly, the inner member 43 is fixed.

[0118] In a state where the stator core 31, the first insulator 32, the second insulator 33, and the coil 34 are assembled together as shown Figure 2 the short - circuit member 35 is assembled. The six coils 34 are wired to form the U (W - U) phase, V (U - V) phase, and W (V - W) phase. Each of the U phase, V phase, and W phase is assigned a pair of coils 34.

[0119] Figure 18 FIG. is a perspective view showing the short - circuit member 35, the inner member 43 provided with the coil 34, and the outer member 40 according to the present embodiment. Figure 19 FIG. is an exploded perspective view of the short - circuit member 35 according to the present embodiment. In the following description, the coil 34 assigned to the U phase is appropriately referred to as the U - phase coil 34U, the coil 34 assigned to the V phase is appropriately referred to as the V - phase coil 34V, and the coil 34 assigned to the W phase is appropriately referred to as the W - phase coil 34W.

[0120] As shown Figure 18 a pair of U - phase coils 34U are arranged facing each other in the radial direction. A pair of V - phase coils 34V are arranged facing each other in the radial direction. A pair of W - phase coils 34W are arranged facing each other in the radial direction. A pair of U - phase coils 34U includes a first coil 341 and a second coil 342. A pair of V - phase coils 34V includes a first coil 341 and a second coil 342. A pair of W - phase coils 34W includes a first coil 341 and a second coil 342.

[0121] The short - circuit member 35 has a plurality of sheet - metal members 200 and a holding member 210 that holds the sheet - metal members 200. The holding member 210 is formed of an insulating material, for example, formed of synthetic resin. The short - circuit member 35 is annular and has an outer diameter smaller than that of the annular portion 41.

[0122] The sheet - metal member 200 is connected to the power line through the power supply member 100. The power supply member 100 is disposed at a local position around the short - circuit member 35. In addition, the sheet - metal member 200 is connected to the coil 34. Electric power from the power line is supplied to the coil 34 through the power supply member 100 and the sheet - metal member 200.

[0123] The sheet - metal member 200 includes a U - phase sheet - metal member 200U, a V - phase sheet - metal member 200V, and a W - phase sheet - metal member 200W. The coils 34 are wired through the plurality of sheet - metal members 200.

[0124] The power supply component 100 includes a U-phase power supply unit 100U, a V-phase power supply unit 100V, and a W-phase power supply unit 100W. The U-phase power supply unit 100U, the V-phase power supply unit 100V, and the W-phase power supply unit 100W are respectively connected to the power lines. The U-phase sheet metal component 200U is fixed to the U-phase power supply unit 100U by bolts 99U. The V-phase sheet metal component 200V is fixed to the V-phase power supply unit 100V by bolts 99V. The W-phase sheet metal component 200W is fixed to the W-phase power supply unit 100W by bolts 99W.

[0125] As Figure 18 and Figure 19 shown, the sheet metal component 200 is arc-shaped. The U-phase sheet metal component 200U, the V-phase sheet metal component 200V, and the W-phase sheet metal component 200W are arranged along the axial direction.

[0126] The U-phase sheet metal component 200U has a terminal portion 201U, a connection portion 202U, and an arc portion 203U. Among them, the terminal portion 201U connects the adjacent W-phase coil 34W and U-phase coil 34U; the connection portion 202U is connected to the U-phase power supply unit 100U; the arc portion 203U connects the connection portion 202U and the terminal portion 201U. There are 2 terminal portions 201U. The 2 terminal portions 201U respectively connect the adjacent W-phase coil 34W and U-phase coil 34U. One terminal portion 201U connects the first coil 341 of the W-phase coil 34W and the second coil 342 of the U-phase coil 34U. One terminal portion 201U connects the end of the winding of the first coil 341 and the start end of the winding of the second coil 342. The other terminal portion 201U connects the second coil 342 of the W-phase coil 34W and the first coil 341 of the U-phase coil 34U. The other terminal portion 201U connects the end of the winding of the second coil 342 and the start end of the winding of the first coil 341.

[0127] The V-phase sheet metal component 200V has a terminal portion 201V, a connection portion 202V, and an arc portion 203V. Among them, the terminal portion 201V connects the adjacent U-phase coil 34U and V-phase coil 34V; the connection portion 202V is connected to the V-phase power supply portion 100V; the arc portion 203V connects the connection portion 202V and the terminal portion 201V. There are 2 terminal portions 201V. The 2 terminal portions 201V respectively connect the adjacent U-phase coil 34U and V-phase coil 34V. One terminal portion 201V connects the second coil 342 of the U-phase coil 34U and the first coil 341 of the V-phase coil 34V. One terminal portion 201V connects the end of the winding of the second coil 342 and the start end of the winding of the first coil 341. The other terminal portion 201V connects the first coil 341 of the U-phase coil 34U and the second coil 342 of the V-phase coil 34V. The other terminal portion 201V connects the end of the winding of the first coil 341 and the start end of the winding of the second coil 342.

[0128] The W-phase sheet metal component 200W has a terminal portion 201W, a connection portion 202W, and an arc portion 203W. Among them, the terminal portion 201W connects the adjacent V-phase coil 34V and W-phase coil 34W; the connection portion 202W is connected to the W-phase power supply portion 100W; the arc portion 203W connects the connection portion 202W and the terminal portion 201W. There are 2 terminal portions 201W. The 2 terminal portions 201W respectively connect the adjacent V-phase coil 34V and W-phase coil 34W. One terminal portion 201W connects the first coil 341 of the V-phase coil 34V and the second coil 342 of the W-phase coil 34W. One terminal portion 201W connects the end of the winding of the first coil 341 and the start end of the winding of the second coil 342. The other terminal portion 201W connects the second coil 342 of the V-phase coil 34V and the first coil 341 of the W-phase coil 34W. The other terminal portion 201W connects the end of the winding of the second coil 342 and the start end of the winding of the first coil 341.

[0129] [Effect]

[0130] As described above, according to the present embodiment, the stator core 31 has a split structure including an outer member 40 and an inner member 43 disposed inside the outer member 40. The outer member 40 has an annular portion 41 and a plurality of protruding portions 42, and the plurality of protruding portions 42 protrude radially inward from the annular portion 41 and are arranged at intervals in the circumferential direction. The protruding portion 42 functions as a tooth for winding the coil 34. According to the present embodiment, since the annular portion 41 and the plurality of protruding portions 42 are a single member, the relative position shift of the protruding portion 42 (tooth) can be suppressed.

[0131] Since a plurality of protruding portions 42 are provided radially inside the annular portion 41, the protruding portions 42 can be smoothly inserted into the first insulator 32 and the second insulator 33. The first insulator 32 and the second insulator 33 are wound with the coil 34 in a state where they are not mounted on the outer member 40. For example, when the first coil 341 is wound around the first insulator 32, the first coil 341 can be wound around the first insulator 32 in a state where the first insulator 32 is not mounted on the outer member 40. Therefore, for example, in the case of winding the first coil 341 in a nozzle manner, the space for the nozzle to move is sufficiently ensured. Therefore, the operation of winding the first coil 341 around the protruding portion 42 can be efficiently performed. In addition, regardless of the winding method of the first coil 341, the first coil 341 can be properly wound around the first insulator 32 in an aligned state. Therefore, the duty factor of the first coil 341 is improved. In addition, since the first coil 341 can be wound around the first insulator 32 before the first insulator 32 is mounted on the outer member 40, the nozzle can freely approach the first coil 341. Therefore, the outer shape of the first coil 341 can be easily optimized to improve the duty factor. Since the coating agent can be easily applied to the first coil 341, the durability, dust resistance, and waterproofness of the first coil 341 can be improved. In addition, a protective agent can be exemplified. In addition, by applying the coating agent to the first coil 341, the deformation of the first coil 341 can be suppressed. The same applies to the second coil 342 wound around the second insulator 33.

[0132] In addition, the annular portion 41 and the plurality of protruding portions 42 are integral. Therefore, for example, compared with a split structure in which the stator core is divided along the circumferential direction, the magnetic flux path can be prevented from being cut off. In addition, the inner member 43 is connected to the inner end portion of the protruding portion 42. Therefore, the outer member 40 and the inner member 43 are properly connected together. Accordingly, at the boundary between the outer member 40 and the inner member 43, the magnetic flux path can also be prevented from being cut off. Therefore, a reduction in the reliability of the motor 8 can be suppressed.

[0133] In addition, by making the stator core 31 a split structure, the opening of the inner member 43 can be formed larger. Accordingly, the rotor 23 disposed in the opening of the inner member 43 can be made larger. In addition, since the bearings for supporting the rotating shaft 22 of the rotor 23 can be made larger, the performance of the motor 8 can be improved. Further, when the air flowing in from the air inlet 3a flows through the opening of the annular portion 41, since the opening of the inner member 43 is large, the air can flow smoothly. Therefore, the motor 8 is efficiently cooled by the air.

[0134] The radially outer end of the first insulator 32 is connected to the annular portion 41 of the outer member 40, and the radially inner end of the first insulator 32 is connected to the inner member 43. Accordingly, the first insulator 32 wound with the first coil 341 is appropriately disposed on the outer member 40 and the inner member 43, respectively. The same applies to the second insulator 33.

[0135] The first insulator 32 has a cylindrical portion 51, an outer wall portion 52, and an inner wall portion 53, wherein the outer wall portion 52 is provided at the radially outer end of the cylindrical portion 51; the inner wall portion 53 is provided at the radially inner end of the cylindrical portion 51. Accordingly, the first coil 341 is wound around the cylindrical portion 51 while being supported by the outer wall portion 52 and the inner wall portion 53, respectively. The same applies to the second insulator 33.

[0136] In addition, when the first insulator 32 and the second insulator 33 are circumferentially arranged on the stator core 31, an outer cylindrical portion 110 is formed by a plurality of outer wall portions 52 and a plurality of outer wall portions 72, and an inner cylindrical portion 120 is formed by a plurality of inner wall portions 53 and a plurality of inner wall portions 73. By integrating the plurality of first insulators 32 and the plurality of second insulators 33, the strength of the stator core 31 is improved.

[0137] In the first insulator 32, the dimension of the outer wall portion 52 in the circumferential direction is larger than the dimension of the inner wall portion 53 in the circumferential direction. In the second insulator 33, the dimension of the outer wall portion 72 in the circumferential direction is smaller than the dimension of the inner wall portion 53 in the circumferential direction. The first insulator 32 and the second insulator 33 are alternately arranged in the circumferential direction. After performing the operation of inserting the protrusion 42 into the first insulator 32 and then performing the operation of inserting the protrusion 42 into the second insulator 33, the protrusion 42 can be smoothly inserted into the first insulator 32 and the second insulator 33, respectively.

[0138] A locking portion 59 and a locking portion 60 for locking the end of the first coil 341 are provided on the outer wall portion 52 of the first insulator 32. Accordingly, the first coil 341 is appropriately held by the first insulator 32. The same applies to the second insulator 33.

[0139] An inclined portion 56 is provided on the outer surface of the outer wall portion 52 of the first insulator 32, and the inclined portion 56 inclines as it approaches the inner surface of the cylindrical portion 51. The inclined portion 56 is in close contact with the inclined portion 41a of the annular portion 41. Therefore, the first insulator 32 is properly positioned with respect to the outer member 40. The same applies to the second insulator 33.

[0140] An engaging groove portion 42a is provided in the protruding portion 42, and an engaging convex portion 93 is provided in the inner member 43. The engaging convex portion 93 is inserted into the engaging groove portion 42a, whereby the outer member 40 and the inner member 43 are positioned with high precision.

[0141] One end portion of the engaging groove portion 42a in the axial direction is blocked, and the other end portion of the engaging groove portion 42a is open. Therefore, the engaging convex portion 93 is smoothly inserted into the engaging groove portion 42a from the other end portion of the engaging groove portion 42a. In addition, by blocking one end portion of the engaging groove portion 42a, the engaging convex portion 93 is positioned in the axial direction.

[0142] One end portion of the engaging groove portion 42a is closed by the inner surface of the through hole 54 provided in the first insulator 32, and the other end portion of the engaging groove portion 42a is open by communicating with the communication groove portion 62 provided in the first insulator 32. Therefore, the installation and positioning of the inner member 43 with respect to the protruding portion 42 can be easily performed. The same applies to the second insulator 33.

[0143] By providing a locking member 95 that blocks the other end portion of the engaging groove portion 42a, the engaging convex portion 93 can be prevented from coming off from the engaging groove portion 42a.

[0144] A narrow portion 91 is provided in the inner member 43, and a resin layer 92 is provided in the narrow portion 91. Since the flow of magnetic flux is suppressed in the narrow portion 91, an appropriate magnetic field can be generated. In addition, by providing the resin layer 92 in the narrow portion 91, a decrease in the rigidity of the inner member 43 can be suppressed.

[0145] [Other Embodiments]

[0146] In the above-described embodiment, after winding the coil 34 around the first insulator 32 and the second insulator 33 that can be separated from the outer member 40, the protruding portion 42 is inserted into the first insulator 32 and the second insulator 33. Alternatively, the coil 34 may be wound around the protruding portion 42 in a state where the insulator is provided on the surface of the protruding portion 42.

[0147] In addition, in the above-described embodiment, the power tool 1 is a vibrating screwdriver drill. The power tool 1 is not limited to a vibrating screwdriver drill. Examples of the power tool 1 include a screwdriver drill, an angle drill, an impact drill, a grinder, a jackhammer, a hammer drill, a circular saw, and a reciprocating saw.

[0148] In the above-described embodiment, the electric working machine is a power tool. The electric working machine is not limited to a power tool. Examples of the electric working machine include gardening tools. Examples of the gardening tools include a chain saw, a hedge trimmer, a lawn mower, a grass cutter, and a blower.

[0149] In the above-described embodiment, the battery pack 11 mounted on the battery mounting portion 7 is used as the power source of the electric working machine. As the power source of the electric working machine, a commercial power source (alternating current power source) may also be used.

[0150] [Description of Reference Numerals]

[0151] 1: Power tool (power working machine); 2: Handle housing; 3: Main body housing; 3a: Air inlet; 3b: Exhaust port; 4: Motor housing; 5: Gear housing; 6: Output shaft; 7: Battery mounting part; 8: Motor; 9: Rear cover; 10: Power transmission mechanism; 11: Battery pack; 12: Trigger switch; 13: Forward / reverse switching operation lever; 14: Speed switching operation lever; 15: Mode switching ring; 16: Switching ring; 17: Light; 18: Controller; 21: Stator; 22: Rotating shaft; 23: Rotor; 31: Stator core; 32: First insulator; 33: Second insulator; 34: Coil; 34U: U-phase coil; 34V: V-phase coil; 34W: W-phase coil; 35: Short-circuit component; 40: Outer component; 41: Ring part; 41a: Inclined part; 42: Protrusion; 42a: Engaging groove part; 43: Inner component; 51: Cylindrical part; 52: Outer wall part; 53: Inner wall part; 54: Through hole (stopper part); 55: Thin wall part; 56: Inclined part; 57: Notch part; 58: Notch part; 59: Locking part; 60: Locking part; 61: Thin wall part; 62: Connecting groove part; 63: Locking groove part; 71: Cylindrical part; 72: Outer wall part; 73: Inner wall part; 74: Through hole (stopper part); 75: Thin wall part; 76: Inclined part; 77: Notch part; 78: Notch part; 79: Locking part; 80: Locking part; 81: Thin wall part; 82: Connecting groove part; 83: Locking groove part; 91: Narrow part; 92: Resin layer; 93: Engaging convex part; 95: Locking component; 96: Ring part; 97: Tapered part; 99U: Bolt; 99V: Bolt; 99W: Bolt; 100: Power supply component; 100U: U-phase power supply part; 100V: V-phase power supply part; 100W: W-phase power supply part; 110: Outer cylindrical part; 120: Inner cylindrical part; 200: Sheet metal component; 200U: U-phase sheet metal component; 201U: Terminal part; 202U: Connecting part; 203U: Arc part; 200V: V-phase sheet metal component; 201V: Terminal part; 202V: Connecting part; 203V: Arc part; 200W: W-phase sheet metal component; 201W: Terminal part; 202W: Connecting part; 203W: Arc part; 210: Holding component; 341: First coil; 342: Second coil; AX: Axis of rotation.

Claims

1. An electric working machine, characterized in that, It has a motor, a power transmission mechanism, and an output shaft. Among them, the motor has a stator and a rotor, where the rotor is disposed inside the stator and can rotate about the rotation axis; the output shaft is for mounting a tip tool and is driven by the power transmitted from the motor via the power transmission mechanism, the stator has a stator core, an insulator, and a plurality of coils, the stator core has an outer member and an inner member, where, the outer member has a circular ring portion and a plurality of protrusions, where the plurality of protrusions protrude radially inward from the circular ring portion and are arranged at intervals in the circumferential direction for supporting the coils through the insulator, and the circular ring portion and the plurality of protrusions are integrally formed; the inner member is cylindrical, is disposed inside the outer member and the insulator, and is connected to the inner ends of the plurality of protrusions, the protrusion has an engaging groove portion, which is provided at the inner end of the protrusion and extends along the axial direction, the insulator has a cylindrical portion, an outer wall portion, and an inner wall portion. Among them, the cylindrical portion has a through hole for inserting the protrusion; the outer wall portion is provided at the radially outer end of the cylindrical portion; the inner wall portion is provided at the radially inner end of the cylindrical portion, a communication groove portion is provided on the inner surface of the inner wall portion, and the communication groove portion communicates with the engaging groove portion, in a state where the protrusion is inserted into the through hole, the engaging groove portion and the communication groove portion communicate in the axial direction, the inner member has an engaging convex portion, which is provided on the outer surface of the inner member and can be inserted into the engaging groove portion from one end side in the axial direction through the communication groove portion, the insulator includes a first insulator and a second insulator. Among them, the outer wall portion of the first insulator has a larger size in the circumferential direction than the inner wall portion of the first insulator in the circumferential direction; the outer wall portion of the second insulator has a smaller size in the circumferential direction than the inner wall portion of the second insulator in the circumferential direction, the first insulator and the second insulator are alternately arranged in the circumferential direction.

2. The electric working machine according to claim 1, characterized in that, the radially outer end of the insulator is connected to the outer member, the radially inner end of the insulator is connected to the inner member.

3. The electric working machine according to claim 1 or 2, characterized in that, A plurality of the insulators are arranged along the circumferential direction on the stator core, in a state where a plurality of the insulators are arranged along the circumferential direction, an outer cylindrical portion is formed by a plurality of the outer wall portions, and an inner cylindrical portion is formed by a plurality of the inner wall portions.

4. An electric working machine, characterized in that, It has a motor, a power transmission mechanism, and an output shaft. Among them, the motor has a stator and a rotor, where the rotor is disposed inside the stator and can rotate about the rotation axis; the output shaft is for mounting a tip tool and is driven by the power transmitted from the motor via the power transmission mechanism, the stator has a stator core, an insulator, and a plurality of coils, the stator core has an outer member and an inner member, where, the outer member has a circular ring portion and a plurality of protrusions, where the plurality of protrusions protrude radially inward from the circular ring portion and are arranged at intervals in the circumferential direction for supporting the coils, The inner member is disposed inside the outer member and connected to the inner end portion of the protrusion portion. The insulator is disposed around the protrusion portion. The coil is disposed around the insulator. The insulator has a cylindrical portion, an outer wall portion, and an inner wall portion, wherein The cylindrical portion is disposed around the protrusion portion. The outer wall portion is provided at the end portion on the radially outer side of the cylindrical portion. The inner wall portion is provided at the end portion on the radially inner side of the cylindrical portion. A plurality of the insulators are circumferentially arranged on the stator core. In a state where a plurality of the insulators are circumferentially arranged, an outer cylindrical portion is formed by a plurality of the outer wall portions, and an inner cylindrical portion is formed by a plurality of the inner wall portions. The insulator includes a first insulator and a second insulator, wherein the outer wall portion of the first insulator has a larger dimension in the circumferential direction than the inner wall portion of the first insulator in the circumferential direction; the outer wall portion of the second insulator has a smaller dimension in the circumferential direction than the inner wall portion of the second insulator in the circumferential direction. The first insulator and the second insulator are alternately arranged in the circumferential direction.

5. The electric working machine according to claim 4, wherein, The insulator has a locking portion provided on the outer wall portion for locking the end portion of the coil.

6. The electric working machine according to claim 4 or 5, wherein, The insulator has an inclined portion provided on the outer surface of the outer wall portion and inclined radially inward as it approaches the inner surface of the cylindrical portion.

7. The electric working machine according to claim 4 or 5, wherein, The protrusion portion has an engaging groove portion provided at the inner end portion of the protrusion portion and extending in the axial direction. The inner member has an engaging convex portion provided on the outer surface of the inner member and engaging with the engaging groove portion.

8. The electric working machine according to claim 7, wherein, One end portion of the engaging groove portion in the axial direction is blocked, and the other end portion of the engaging groove portion is open.

9. The electric working machine according to claim 8, wherein, A stopper portion provided on the insulator is disposed at one end portion of the engaging groove portion. A communication groove portion provided on the insulator is disposed at the other end portion of the engaging groove portion.

10. The electric working machine according to claim 8, wherein, A locking member is disposed in a locking groove portion provided on the insulator for blocking the other end portion of the engaging groove portion.

11. The electric working machine according to claim 7, wherein, The inner member has a narrow portion provided between the engaging convex portions adjacent to each other in the circumferential direction. A resin layer is provided on the narrow portion.

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