JP2023137964A - Electric working machine - Google Patents

Abstract

To radiate heat of a coil.SOLUTION: An electric working machine includes: a motor having a stator including a coil, a rotor rotating relative to the stator and a rotor shaft fixed to the rotor; an output part driven by the rotor shaft; a motor case which has a body part having an insertion port, and a lid part which is arranged on a side closer to one side in an axial direction than the body part and is connected to the body part so as to block the insertion port, and stores the stator and the rotor; a resin part which covers the coil and is stored in the motor case; a seal member for sealing a boundary between the body part and the lid part; and a heat conductive material which is arranged between the lid part and the resin part.SELECTED DRAWING: Figure 4

Description

The technology disclosed in this specification relates to an electric working machine.

In the technical field related to electric working machines, a power tool as disclosed in Patent Document 1 is known.

Japanese Patent Application Publication No. 2006-067639

Electric working machines are equipped with a motor as a power source. The motor has a stator that includes a coil, and a rotor that rotates relative to the stator. Depending on the specifications of the electric working machine, it may be desirable to arrange at least a portion of the motor in a closed space. When a drive current is supplied to the coil, the coil generates heat. If the motor is placed in an enclosed space, the motor may become overheated if the coil heat is not sufficiently dissipated.

The technology disclosed herein is aimed at dissipating heat in the coil.

This specification discloses an electric work machine. The electric working machine may include a motor, an output section, a motor case, a resin section, a seal member, and a heat conductive material. The motor may include a stator that includes a coil, a rotor that rotates relative to the stator, and a rotor shaft that is fixed to the rotor. The output part may be driven by a rotor shaft. The motor case may include a main body portion having an insertion port, and a lid portion disposed on one side in the axial direction of the main body portion and connected to the main body portion so as to close the insertion port. The stator and rotor may be housed in a motor case. The resin part may cover the coil. The resin part may be housed in the motor case. The sealing member may seal the boundary between the main body and the lid. The thermally conductive material may be placed between the lid part and the resin part.

According to the technology disclosed herein, heat from the coil is dissipated.

FIG. 1 is a perspective view from the left showing an electric working machine according to a first embodiment. FIG. 2 is a perspective view from the left showing the motor assembly according to the first embodiment. FIG. 3 is a side view showing the motor assembly according to the first embodiment. FIG. 4 is a longitudinal sectional view showing the motor assembly according to the first embodiment. FIG. 5 is a cross-sectional view showing the motor assembly according to the first embodiment. FIG. 6 is a partially enlarged vertical cross-sectional view of the motor assembly according to the first embodiment. FIG. 7 is an exploded perspective view from the left showing the motor assembly according to the first embodiment. FIG. 8 is a perspective view from the left showing the motor assembly according to the second embodiment. FIG. 9 is a side view showing a motor assembly according to the second embodiment. FIG. 10 is a longitudinal sectional view showing a motor assembly according to the second embodiment. FIG. 11 is an enlarged vertical cross-sectional view of a part of the motor assembly according to the second embodiment. FIG. 12 is a perspective view from the left showing the motor assembly according to the third embodiment. FIG. 13 is a side view showing a motor assembly according to a third embodiment. FIG. 14 is a longitudinal sectional view showing a motor assembly according to a third embodiment. FIG. 15 is an enlarged vertical cross-sectional view of a part of the motor assembly according to the third embodiment.

In one or more embodiments, the electric working machine may include a motor, an output section, a motor case, a resin section, a seal member, and a thermally conductive material. The motor may include a stator that includes a coil, a rotor that rotates relative to the stator, and a rotor shaft that is fixed to the rotor. The output part may be driven by a rotor shaft. The motor case may include a main body portion having an insertion port, and a lid portion disposed on one side in the axial direction of the main body portion and connected to the main body portion so as to close the insertion port. The stator and rotor may be housed in a motor case. The resin part may cover the coil. The resin part may be housed in the motor case. The sealing member may seal the boundary between the main body and the lid. The thermally conductive material may be placed between the lid part and the resin part.

In the above configuration, the seal member prevents foreign matter around the motor case from entering the internal space of the motor case. Foreign matter around the motor case includes dust and moisture. By disposing the heat conductive material between the lid part and the resin part, the heat of the coil is transferred to the lid part via the resin part and the heat conductive material. The heat of the coil transferred to the lid is dissipated into the space around the motor case. For example, even if a situation occurs in which the gap between the resin part and the lid increases when the main body and the lid are connected so that the seal member is compressed due to a dimensional error in the resin part, The thermally conductive material fills the gap between the resin part and the lid part.

In one or more embodiments, the thermally conductive material may contact both the lid and the resin.

In the above configuration, the heat of the coil is efficiently transferred to the lid part via the resin part and the heat conductive material.

In one or more embodiments, the thermally conductive material may include a thermally conductive sheet.

With the above configuration, a decrease in workability when arranging the heat conductive material between the resin part and the lid part is suppressed.

In one or more embodiments, the thermally conductive sheet may be placed between the lid part and the resin part in a compressed state.

In the above configuration, the thermally conductive sheet can be brought into close contact with each of the lid part and the resin part. Therefore, the heat of the coil is efficiently transferred to the lid part via the resin part and the heat conductive sheet.

In one or more embodiments, at least a portion of the resin portion may contact the body portion.

In the above configuration, the heat of the coil is efficiently transferred to the main body part via the resin part. The heat of the coil transferred to the main body is dissipated into the space around the motor case.

In one or more embodiments, the lid portion includes a contact area that contacts the thermally conductive material and a connection area that is connected to a peripheral area of the body portion that is arranged around the insertion port and faces to one side in the axial direction. May include.

With the above configuration, the heat of the coil is efficiently transferred to the lid via the resin portion and the heat conductive material, and the main body and the lid are properly connected.

In one or more embodiments, the contact area may be located axially to one side of the connection area.

With the above configuration, a decrease in workability when connecting the main body and the lid is suppressed. Furthermore, the motor case is prevented from increasing in size.

In one or more embodiments, the sealing member may seal the interface between the peripheral region of the body and the connection region of the lid.

In the above configuration, the seal member prevents foreign matter around the motor case from entering the internal space of the motor case.

In one or more embodiments, the seal member may be disposed between the body and the lid in a compressed state.

In the above configuration, the sealing member can be brought into close contact with each of the main body and the lid. Therefore, foreign matter around the motor case is prevented from entering the internal space of the motor case.

In one or more embodiments, the resin portion may include a first portion that covers the coil and a second portion that is disposed on one side in the axial direction than the first portion. The first part and the second part may be integral. Each of the first portion and the second portion may be cylindrical. The second inner diameter indicating the inner diameter of the second portion may be larger than the first inner diameter indicating the inner diameter of the first portion. A thermally conductive material may be disposed between the lid and the second portion.

In the above configuration, the second inner diameter of the second portion disposed on one side in the axial direction than the first portion is larger than the first inner diameter of the first portion. Therefore, an increase in the weight of the resin portion is suppressed. By suppressing an increase in the weight of the resin portion, an increase in the weight of the electric working machine is suppressed.

In one or more embodiments, the electric working machine may include a motor, an output section, a motor case, a resin section, and a seal member. The motor may include a stator that includes a coil, a rotor that rotates relative to the stator, and a rotor shaft that is fixed to the rotor. The output part may be driven by a rotor shaft. The motor case may include a main body portion having an insertion port, and a lid portion disposed on one side in the axial direction of the main body portion and connected to the main body portion so as to close the insertion port. The stator and rotor may be housed in a motor case. The resin part may cover the coil. The resin part may be housed in the motor case. The sealing member may seal the boundary between the main body and the lid. The lid portion may include a contact region that contacts the resin portion, and a connection region that is arranged around the insertion port and connected to a peripheral region of the main body portion facing one side in the axial direction. The peripheral area of the main body part and the end surface of the resin part facing the contact area may be arranged in the same plane. The contact area and the connection area may be arranged in the same plane.

In the above configuration, the seal member prevents foreign matter around the motor case from entering the internal space of the motor case. Foreign matter around the motor case includes dust and moisture. Since the lid portion has a contact area that contacts the resin portion, the heat of the coil is efficiently transferred to the lid portion via the resin portion. The heat of the coil transferred to the lid is dissipated into the space around the motor case. Since the peripheral area of the main body and the end surface of the resin part are arranged in the same plane, and the contact area and the connection area of the lid are arranged in the same plane, the main body and the lid are arranged so that the sealing member is compressed. In the state where the parts are connected, the gap between the resin part and the lid part is prevented from increasing.

In one or more embodiments, the peripheral region of the main body and the connection region of the lid may be in contact with the end surface of the resin portion and the contact region of the lid.

With the above configuration, the heat of the coil is efficiently transferred to the lid via the resin part, and the main body and the lid are properly connected.

In one or more embodiments, the sealing member may seal the interface between the peripheral region of the body and the connection region of the lid.

In the above configuration, the seal member prevents foreign matter around the motor case from entering the internal space of the motor case.

In one or more embodiments, the seal member may be disposed between the body and the lid in a compressed state.

In the above configuration, the sealing member can be brought into close contact with each of the main body and the lid. Therefore, foreign matter around the motor case is prevented from entering the internal space of the motor case.

In one or more embodiments, at least a portion of the resin portion may contact the body portion.

In the above configuration, the heat of the coil is efficiently transferred to the main body part via the resin part. The heat of the coil transferred to the main body is dissipated into the space around the motor case.

In one or more embodiments, the resin portion may include a first portion that covers the coil and a second portion that is disposed on one side in the axial direction than the first portion. The first part and the second part may be integral. Each of the first portion and the second portion may be cylindrical. The second inner diameter indicating the inner diameter of the second portion may be larger than the first inner diameter indicating the inner diameter of the first portion. The end surface of the resin portion may include the end surface of the second portion.

In the above configuration, the second inner diameter of the second portion disposed on one side in the axial direction than the first portion is larger than the first inner diameter of the first portion. Therefore, an increase in the weight of the resin portion is suppressed. By suppressing an increase in the weight of the resin portion, an increase in the weight of the electric working machine is suppressed.

In one or more embodiments, the electric working machine may include a motor, an output section, a motor case, a resin section, and a seal member. The motor may include a stator that includes a coil, a rotor that rotates relative to the stator, and a rotor shaft that is fixed to the rotor. The output part may be driven by a rotor shaft. The motor case may include a main body portion having an insertion port, and a lid portion disposed on one side in the axial direction of the main body portion and connected to the main body portion so as to close the insertion port. The stator and rotor may be housed in a motor case. The resin part may cover the coil. The resin part may be housed in the motor case. The sealing member may seal the boundary between the main body and the lid. The lid part is connected to a contact area that contacts the resin part, an opposing area that faces the peripheral area of the main body that is arranged around the insertion opening and faces one side in the axial direction, and an outer peripheral area of the main body that faces outward in the radial direction. It may also include an inner circumferential region.

In the above configuration, the seal member prevents foreign matter around the motor case from entering the internal space of the motor case. Foreign matter around the motor case includes dust and moisture. Since the lid portion has a contact area that contacts the resin portion, the heat of the coil is efficiently transferred to the lid portion via the resin portion. The heat of the coil transferred to the lid is dissipated into the space around the motor case. Since the outer peripheral area of the main body part and the inner peripheral area of the lid part are connected, the gap between the resin part and the lid part is large when the main body part and the lid part are connected so that the sealing member is compressed. It is suppressed from becoming.

In one or more embodiments, the seal member may seal the interface between the outer circumferential region of the body and the inner circumferential region of the lid.

In the above configuration, the seal member prevents foreign matter around the motor case from entering the internal space of the motor case.

In one or more embodiments, the end surface of the resin part facing the contact area may be arranged on one side in the axial direction with respect to the peripheral area of the main body part. The contact area and the opposing area may be arranged in the same plane.

In the above configuration, the peripheral region of the main body portion and the facing region of the lid portion face each other with a gap therebetween, and the end surface of the resin portion and the contact region of the lid portion are in contact with each other. Due to the contact between the lid part and the resin part, the heat of the coil is efficiently transferred to the lid part via the resin part, and the main body part and the lid part are properly connected with the seal member being compressed.

In one or more embodiments, the resin portion may include a first portion that covers the coil and a second portion that is disposed on one side in the axial direction than the first portion. The first part and the second part may be integral. Each of the first portion and the second portion may be cylindrical. The second inner diameter indicating the inner diameter of the second portion may be larger than the first inner diameter indicating the inner diameter of the first portion. The end surface of the resin portion may include the end surface of the second portion.

In the above configuration, the second inner diameter of the second portion disposed on one side in the axial direction than the first portion is larger than the first inner diameter of the first portion. Therefore, an increase in the weight of the resin portion is suppressed. By suppressing an increase in the weight of the resin portion, an increase in the weight of the electric working machine is suppressed.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. Furthermore, some components may not be used.

In the embodiment, the positional relationship of each part will be described using the terms "left", "right", "front", "rear", "upper", and "lower". These terms indicate relative positions or directions with respect to the center of the electric working machine 1.

The electric working machine 1 has a motor 12. In the embodiment, a direction parallel to the rotation axis AX of the motor 12 is appropriately referred to as an axial direction. The radial direction of the rotation axis AX of the motor 12 is appropriately referred to as the radial direction. The direction in which the motor 12 revolves around the rotation axis AX is appropriately referred to as a circumferential direction or a rotation direction.

In the axial direction, a position close to or a direction approaching the center of the motor 12 is appropriately referred to as an axially inner side, and a position far from or a direction away from the center of the motor 12 is appropriately referred to as an axially outer side. The position or direction on one side in the axial direction is appropriately referred to as one side in the axial direction, and the position or direction on the other side in the axial direction is appropriately referred to as the other side in the axial direction. In the radial direction, a position close to or a direction approaching the rotation axis AX of the motor 12 is appropriately referred to as the radially inner side, and a position far from or a direction away from the rotation axis AX of the motor 12 is appropriately referred to as the radially outer side. A position on one side in the circumferential direction or a direction on one side is appropriately referred to as one side in the circumferential direction, and a position on the other side in the circumferential direction or a direction on the other side is appropriately referred to as the other side in the circumferential direction.

[First embodiment]
A first embodiment will be described.

<Electric work equipment>
FIG. 1 is a perspective view from the left showing an electric working machine 1 according to the present embodiment. In this embodiment, the electric working machine 1 is a chainsaw, which is a type of gardening tool (Outdoor Power Equipment).

The electric working machine 1 includes a housing 2, a front grip part 3, a hand guard 4, a battery cover 5, a controller 6, a trigger lock lever 7, a trigger switch 8, a guide bar 9, and a saw chain 10. , and a motor assembly 11A.

The housing 2 is made of synthetic resin. The housing 2 includes a motor accommodating portion 14, a battery holding portion 15, and a rear grip portion 16.

Motor accommodating portion 14 accommodates motor assembly 11A. Motor assembly 11A includes a motor 12.

The battery holding section 15 holds a battery pack (not shown). The battery holding section 15 has a battery mounting section into which a battery pack is mounted. The battery holding section 15 holds the battery pack via the battery mounting section. The battery holding section 15 is connected to the rear end of the motor accommodating section 14 . The battery cover 5 is arranged to cover the battery pack held by the battery holding part 15.

The battery pack can be attached to and detached from the battery holding section 15. The battery pack includes a secondary battery. In this embodiment, the battery pack includes a rechargeable lithium ion battery. The battery pack functions as a power supply section of the electric working machine 1. The battery pack can supply power to the electric working machine 1 by being held by the battery holding part 15.

The rear grip portion 16 is held by the hand of a worker using the electric working machine 1. The rear grip section 16 is connected to the rear end of the battery holding section 15. A portion of the rear grip section 16 is connected to the upper part of the rear end of the battery holding section 15. A portion of the rear grip section 16 is connected to the lower part of the rear end of the battery holding section 15 .

An intake port 2A is provided on the left side of the motor accommodating portion 14. An exhaust port 2B is provided at the front of the motor accommodating portion 14. Air outside the housing 2 can flow into the housing 2 through the intake port 2A. Air inside the housing 2 can flow out of the housing 2 through the exhaust port 2B.

The front grip part 3 is held by the operator's hand. The front grip portion 3 is made of synthetic resin. The front grip portion 3 is a pipe-shaped member. The front grip part 3 is connected to the housing 2. The left end portion of the front grip portion 3 is connected to the left side surface of the motor housing portion 14 . The right end portion of the front grip portion 3 is connected to the right side surface of the battery holding portion 15.

The hand guard 4 protects the hand of the worker who grips the front grip part 3. The hand guard 4 is arranged in front of the front grip section 3. The hand guard 4 is connected to the upper part of the motor accommodating part 14.

Controller 6 outputs a control signal to control electric working machine 1 . The controller 6 controls the drive current supplied to the motor 12 from the battery pack. The controller 6 is housed in the motor housing section 14 .

The trigger lock lever 7 is operated by the operator of the electric working machine 1 so that the trigger switch 8 becomes operable. The trigger lock lever 7 is arranged on the rear grip section 16.

Trigger switch 8 is operated by the operator of electric working machine 1 to drive motor 12 . The trigger switch 8 is arranged on the rear grip section 16. The operator can operate the trigger switch 8 with his fingers after gripping the rear grip part 16 with his hand and operating the trigger lock lever 7. By operating the trigger switch 8, a drive current is supplied to the motor 12, and the motor 12 is driven.

Guide bar 9 guides saw chain 10. The guide bar 9 is a plate-shaped member that is long in the front-rear direction. A guide bar 9 extends forward from the housing 2.

The saw chain 10 is an output part of the electric working machine 1 driven by the motor 12. Saw chain 10 includes a plurality of interconnected cutters. The saw chain 10 is arranged at the periphery of the guide bar 9. The motor 12 and the saw chain 10 are connected via a power transmission mechanism (not shown) including a sprocket. When the trigger switch 8 is operated and the motor 12 is driven, the saw chain 10 moves along the periphery of the guide bar 9.

<Motor assembly>
FIG. 2 is a perspective view from the left showing the motor assembly 11A according to the present embodiment. FIG. 3 is a side view showing the motor assembly 11A according to this embodiment. FIG. 4 is a longitudinal cross-sectional view showing the motor assembly 11A according to this embodiment. FIG. 5 is a cross-sectional view showing the motor assembly 11A according to this embodiment. FIG. 6 is an enlarged vertical cross-sectional view of a part of the motor assembly 11A according to this embodiment. FIG. 7 is an exploded perspective view from the left showing the motor assembly 11A according to this embodiment.

The motor assembly 11A includes a motor 12, a motor case 13A, a bearing 18, a cooling fan 20, a sensor board 22, a seal member 25, a seal member 26, a seal member 23, a resin part 19, and a heat conductor. material 80.

The motor 12 is a power source for the electric working machine 1. The motor 12 is an electric motor that is driven based on a drive current supplied from a battery pack.

The motor 12 is an inner rotor type brushless motor. The motor 12 includes a stator 27, a rotor 28 that rotates with respect to the stator 27, and a rotor shaft 29 that is fixed to the rotor 28. Stator 27 is arranged to surround at least a portion of rotor 28. The rotor 28 rotates around the rotation axis AX. The saw chain 10 is driven by a rotor shaft 29.

In this embodiment, the rotation axis AX of the rotor 28 extends in the left-right direction. The axial direction parallel to the rotation axis AX and the left-right direction coincide. In this embodiment, one axial side is the left side, and the other axial side is the right side.

Stator 27 includes a stator core 30, an insulator 31, a coil 32, and a busbar unit 33.

Stator core 30 includes a plurality of laminated steel plates. A steel plate is a metal plate whose main component is iron. Stator core 30 includes an annular yoke 34 and teeth 35 that protrude radially inward from the inner surface of yoke 34. The yoke 34 is arranged to surround the rotation axis AX. A plurality of teeth 35 are arranged in the circumferential direction. In this embodiment, twelve teeth 35 are arranged. The plurality of teeth 35 are arranged at equal intervals in the circumferential direction.

Insulator 31 covers at least a portion of the surface of stator core 30. The insulator 31 covers at least the coil supporting surface of the teeth 35 around which the coil 32 is wound. The insulator 31 is made of synthetic resin. Insulator 31 is fixed to stator core 30. Insulator 31 is integrally molded with stator core 30. Insulator 31 is fixed to stator core 30 by insert molding.

The coil 32 is wound around the teeth 35 via the insulator 31. Coil 32 and stator core 30 are insulated by insulator 31 . A plurality of coils 32 are provided in the circumferential direction. In this embodiment, twelve coils 32 are provided.

Busbar unit 33 is fixed to insulator 31 with busbar screws 53. Drive current from the battery pack is supplied to the busbar unit 33 via the controller 6.

The busbar unit 33 includes an external terminal 42, a shorting member 44, and an insulating member 45.

The external terminal 42 is connected to the shorting member 44 and the connection terminal 47, respectively. External terminal 42 is connected to coil 32 via shorting member 44 . The short-circuiting member 44 connects (short-circuits) the pair of coils 32 that face each other in the radial direction. Connection terminal 47 is connected to power supply line 46 . External terminal 42 is connected to power supply line 46 via connection terminal 47 . The external terminal 42 and the connection terminal 47 are fixed with screws 52. The external terminal 42 is connected to the battery pack via a connection terminal 47, a power line 46, and the controller 6. The power supply line 46 is a lead wire connected to the coil 32 via the connection terminal 47 , the external terminal 42 , and the shorting member 44 . A driving current for the coil 32 is output from the battery pack. A drive current for the coil 32 output from the battery pack is supplied to the coil 32 via the controller 6 , power line 46 , connection terminal 47 , external terminal 42 , and shorting member 44 .

The insulating member 45 is made of synthetic resin. The insulating member 45 is provided so as to surround the rotation axis AX. Insulating member 45 covers shorting member 44 . The shorting member 44 is arranged inside the insulating member 45. The insulating member 45 supports the external terminal 42 and the shorting member 44.

The controller 6 controls the drive current supplied to the busbar unit 33 from the battery pack. The drive current from the battery pack is supplied to the external terminal 42 of the busbar unit 33 via the controller 6, the power line 46, and the connection terminal 47. The drive current supplied from the battery pack to the external terminal 42 is supplied to the coil 32 after flowing through the shorting member 44 .

Rotor 28 has a rotor core 54 and rotor magnets 55.

Rotor core 54 includes a plurality of laminated steel plates. A steel plate is a metal plate whose main component is iron. The rotor core 54 is arranged so as to surround the rotation axis AX. Stator core 30 is arranged around rotor core 54 .

Rotor magnet 55 is a permanent magnet. Rotor magnet 55 is supported by rotor core 54 . Rotor magnet 55 is arranged inside rotor core 54 . A plurality of rotor magnets 55 are provided in the circumferential direction. In this embodiment, eight rotor magnets 55 are provided.

The rotor core 54 has a plurality of magnet holes 56 provided at intervals in the circumferential direction. The magnet hole 56 is formed to penetrate the left end surface and right end surface of the rotor core 54. The rotor magnet 55 is arranged in the magnet hole 56.

In this embodiment, the rotor core 54 has a plurality of hollow holes 57 provided at intervals in the circumferential direction. Hollow hole 57 is formed to penetrate the left end surface and right end surface of rotor core 54 . The hollow hole 57 is provided radially inside the magnet hole 56. In this embodiment, four hollow holes 57 are provided. The hollow hole 57 reduces the weight of the rotor core 54.

Rotor shaft 29 extends in the axial direction. The central axis of the rotor shaft 29 and the rotation axis AX coincide. Rotor shaft 29 is arranged inside rotor core 54 . Rotor core 54 and rotor shaft 29 are fixed. In this embodiment, a cylindrical member 58 is arranged around the rotor shaft 29. The cylindrical member 58 is made of an electrically insulating material. The rotor shaft 29 is fixed to the rotor core 54 via a cylindrical member 58. The left portion of the rotor shaft 29 projects to the left from the left end surface of the rotor core 54. The right portion of the rotor shaft 29 protrudes to the right from the right end surface of the rotor core 54.

A rotating magnetic field is generated in the stator 27 by supplying a drive current from the battery pack to the coil 32 via the controller 6 . By generating the rotating magnetic field, the rotor 28 and the rotor shaft 29 rotate around the rotation axis AX.

Motor case 13A houses at least a portion of motor 12. In this embodiment, the motor case 13A accommodates at least the stator 27 and the rotor 28. Motor case 13A has an internal space in which stator 27 and rotor 28 are arranged. In the internal space of the motor case 13A, the stator 27 is arranged so as to surround at least a portion of the rotor 28. The interior space is a closed space. In this embodiment, the internal space is a substantially hermetically sealed space. A portion of the rotor shaft 29 is arranged in the internal space.

Motor case 13A is made of metal. In this embodiment, the motor case 13A is made of aluminum. Note that the motor case 13A may be made of aluminum die casting (ADC12).

Motor case 13A includes a main body 60A and a lid 62A.

The main body portion 60A accommodates the stator 27 and the rotor 28. The stator 27 and the rotor 28 are arranged inside the main body 60A.

The main body portion 60A includes a cylindrical portion 601, a lead wire holding portion 602, and a wall portion 603. The cylindrical portion 601 is provided so as to surround the rotation axis AX. The lead wire holding section 602 is provided at the front part of the cylindrical section 601. The lead wire holding portion 602 projects forward from the front portion of the cylindrical portion 601 . The wall portion 603 is connected to the right end portion of the cylindrical portion 601. An insertion port 63 is provided at the left end of the main body 60A. The stator 27 is inserted into the inside of the main body portion 60A via the insertion port 63.

Radiation fins 61 are provided on the outer surface of the cylindrical portion 601. The radiation fins 61 are provided so as to protrude radially outward from the outer surface of the cylindrical portion 601 . The radiation fins 61 are arranged on the outer surface of the cylindrical portion 601 so as to extend in the axial direction. A plurality of heat radiation fins 61 are provided at intervals in the circumferential direction.

The main body portion 60A has a wiring passage 79 in which the power supply line 46 is arranged. Wiring passage 79 is provided to connect the internal space of motor case 13A and the external space of motor case 13A. The wiring passage 79 is provided in the lead wire holding section 602.

The lid portion 62A is connected to the main body portion 60A so as to close the insertion port 63 of the main body portion 60A. In this embodiment, the lid portion 62A is arranged on the left side of the main body portion 60A. By connecting the main body 60A and the lid 62A so that the insertion port 63 is covered by the lid 62A, an internal space is formed between the main body 60A and the lid 62A. After at least a portion of the motor 12 including the stator 27 is placed inside the main body 60A, the insertion port 63 of the main body 60A is closed with the lid 62A, so that at least a portion of the motor 12 is placed inside the internal space. Placed.

A plurality of screw boss portions 69 are provided around the insertion port 63 in the main body portion 60A. In this embodiment, four screw boss portions 69 are provided at intervals in the circumferential direction. A screw hole is provided in each of the plurality of screw boss portions 69. A plurality of screw boss portions 70 are provided on the peripheral edge of the lid portion 62A. In this embodiment, four screw boss portions 70 are provided at intervals in the circumferential direction. An opening is provided in each of the plurality of screw boss parts 70. With the intermediate portion of the screw 71 disposed in the opening of the screw boss portion 70, the tip of the screw 71 is coupled to the screw hole of the screw boss portion 69, thereby fixing the main body portion 60A and the lid portion 62A. Ru.

The lid portion 62A includes a disk portion 621 and a lead wire holding portion 622. The disk portion 621 is connected to the cylindrical portion 601. Lead wire holding section 622 is connected to lead wire holding section 602. The lead wire holding section 622 is provided at the front part of the disk section 621.

Bearing 18 supports rotor shaft 29. The rotor shaft 29 is rotatably supported by the bearing 18. Bearing 18 is supported by motor case 13A.

Motor case 13A has a shaft hole 72 in which at least a portion of rotor shaft 29 is disposed. The shaft hole 72 is provided to connect the internal space of the motor case 13A and the external space of the motor case 13A. The shaft hole 72 includes a shaft hole 72L in which the left part of the rotor shaft 29 is arranged, and a shaft hole 72R in which the right part of the rotor shaft 29 is arranged. The shaft hole 72L is provided in the disc portion 621 of the lid portion 62A. The shaft hole 72R is provided in the wall portion 603 of the main body portion 60A.

The motor case 13A has a peripheral wall portion 101 that defines the shaft hole 72. The peripheral wall portion 101 is substantially cylindrical. The peripheral wall portion 101 includes a peripheral wall portion 101L that defines the shaft hole 72L, and a peripheral wall portion 101R that defines the shaft hole 72R. The peripheral wall portion 101L is provided on the disk portion 621 of the lid portion 62A. The peripheral wall portion 101L protrudes leftward from the left surface of the disk portion 621. The peripheral wall portion 101R is provided on the wall portion 603 of the main body portion 60A. The peripheral wall portion 101R protrudes rightward from the right surface of the wall portion 603.

The bearing 18 includes a left bearing 18L that supports the left side of the rotor shaft 29, and a right bearing 18R that supports the right side of the rotor shaft 29. The left bearing 18L is arranged in the shaft hole 72L. The right bearing 18R is arranged in the shaft hole 72R.

A left end portion and a right end portion of the rotor shaft 29 are arranged outside the motor case 13A. A right end portion of the rotor shaft 29 is connected to the saw chain 10 via a power transmission mechanism (not shown) including a sprocket. The saw chain 10 is driven by a rotor shaft 29. As the rotor shaft 29 rotates, the saw chain 10 is driven.

Cooling fan 20 is arranged outside motor case 13A. Cooling fan 20 faces at least a portion of the outer surface of motor case 13A. Cooling fan 20 is fixed to rotor shaft 29. The cooling fan 20 is rotated by a rotor shaft 29.

In this embodiment, the cooling fan 20 is arranged to the left of the motor case 13A. The cooling fan 20 is fixed to the left end of a rotor shaft 29 located outside the motor case 13A. Cooling fan 20 faces at least a portion of the outer surface of motor case 13A. In this embodiment, the cooling fan 20 is arranged to face at least a portion of the lid portion 62A.

In this embodiment, the cooling fan 20 is a centrifugal fan. The cooling fan 20 has an inlet 20A provided at the left end of the cooling fan 20 and an outlet 20F provided at the peripheral edge of the cooling fan 20. Cooling fan 20 generates an air flow that cools motor case 13A. When the rotor shaft 29 rotates, the cooling fan 20 rotates together with the rotor shaft 29. When the cooling fan 20 rotates, air around the cooling fan 20 is sucked into the suction port 20A. The air sucked into the suction port 20A is blown out from the blowout port 20F. At least a portion of the air blown out from the air outlet 20F hits the outer surface of the motor case 13A. This cools the motor case 13A.

In this embodiment, the cooling fan 20 is fixed to the rotor shaft 29 via a fan bush 73. The fan bush 73 is an intermediate member that connects the rotor shaft 29 and the cooling fan 20. Fan bush 73 is arranged outside motor case 13A to connect the left end of rotor shaft 29 and cooling fan 20. When the cooling fan 20 rotates, the fan bushing 73 rotates together with the cooling fan 20.

Sensor board 22 supports magnetic sensor 74 . Sensor board 22 is arranged in the internal space of motor case 13A. The sensor substrate 22 has an annular shape. Sensor board 22 is arranged around rotor shaft 29 . The sensor board 22 includes a circuit board 22A on which the magnetic sensor 74 is mounted, and a resin film 22B that covers at least a portion of the surface of the magnetic sensor 74 and the circuit board 22A. The circuit board 22A includes a printed wiring board (PWB). Epoxy resin is exemplified as a material for forming the circuit board 22A. Note that the circuit board 22A may be made of metal such as aluminum, or may be made of a heat dissipating resin having higher thermal conductivity than epoxy resin. The resin film 22B functions as a heat insulating film.

In the axial direction, the sensor substrate 22 is arranged between the lid portion 62A and the stator 27. Sensor board 22 is fixed to motor case 13A. The sensor board 22 is fixed to the lid portion 62A with board screws 78.

Magnetic sensor 74 detects rotor magnet 55. The magnetic sensor 74 is supported by the sensor board 22 so as to face the rotor magnet 55. A Hall element is exemplified as the magnetic sensor 74. The magnetic sensor 74 detects the rotation of the rotor 28 by detecting the rotor magnet 55. A signal line 75 is connected to the sensor board 22. Five signal lines 75 are arranged. A detection signal from the magnetic sensor 74 is transmitted to the controller 6 via a signal line 75.

Seal member 25 seals the boundary between rotor shaft 29 and motor case 13A. Seal member 25 includes an oil seal. Seal member 25 is arranged in shaft hole 72 . The seal member 25 is press-fitted between the rotor shaft 29 and the peripheral wall portion 101. The seal member 25 is supported by the peripheral wall portion 101. Seal member 25 includes a seal member 25L that seals the boundary between the left side of rotor shaft 29 and motor case 13A, and a seal member 25R that seals the boundary between the right side of rotor shaft 29 and motor case 13A. The seal member 25L is arranged in the shaft hole 72L. The seal member 25R is arranged in the shaft hole 72R.

A stopper member 108L is arranged on the left side of the seal member 25L. A stopper member 108R is arranged on the right side of the seal member 25R. The stopper member 108L prevents the seal member 25L from coming out of the shaft hole 72L. The stopper member 108R prevents the seal member 25R from coming out of the shaft hole 72R. A circlip is exemplified as the stopper member 108L and the stopper member 108R.

The seal member 26 seals the boundary between the main body portion 60A and the lid portion 62A. Seal member 26 includes an O-ring. The seal member 26 is arranged to surround the insertion port 63. The left end portion of the main body portion 60A is arranged to face the inner surface (right surface) of the lid portion 62A. A recess 109 is formed at the left end of the main body 60A. The recess 109 is formed to surround the insertion port 63. Seal member 26 is placed in recess 109 .

The sealing member 23 is placed in the wiring passage 79 while holding the power line 46 . The sealing member 23 seals the boundary between the power supply line 46 and the main body portion 60A. Seal member 23 is substantially cylindrical. The seal member 23 is made of rubber. The seal member 23 has a hole in which the power line 46 is placed. Three holes are provided. The three holes are provided parallel to each other. There are three power lines 46. A power line 46 is arranged in each of the three holes. The outer surface of the power supply line 46 and the inner surface of the hole are in close contact with each other.

The seal member 23 is fixed to the motor case 13A by a fixing member 92 while being disposed in the wiring passage 79. The fixing member 92 includes a peripheral wall portion 95 that covers the seal member 23 and a fixing portion 96 that is fixed to the motor case 13A. When the fixing part 96 is fixed to the motor case 13A by the screws 99 with the peripheral wall part 95 covering the sealing member 23, the fixing member 92 moves rearward so as to approach the motor case 13A. Thereby, the seal member 23 is fixed to the motor case 13A.

The resin portion 19 is made of synthetic resin. The resin part 19 is housed in the motor case 13A. The resin portion 19 is arranged in the internal space of the motor case 13A. The resin portion 19 is arranged to cover at least the coil 32 in the internal space of the motor case 13A. In this embodiment, the resin portion 19 is arranged to cover each of the stator core 30 and the insulator 31 in the internal space of the motor case 13A. Moreover, the resin part 19 is arranged so as to cover the busbar unit 33 and the busbar screw 53 in the internal space of the motor case 13A.

As shown in FIGS. 4, 6, and 7, the resin portion 19 includes a first portion 191 and a second portion 192 disposed on the left side of the first portion 191. Each of the first portion 191 and the second portion 192 is cylindrical. A recess 190 is provided in the center of the left surface of the resin portion 19. The recessed portion 190 is formed to be recessed from the left side of the resin portion 19 to the right side. The first portion 191 is a portion of the resin portion 19 located on the right side of the recess 190 . The second portion 192 is a portion of the resin portion 19 that is disposed radially outward from the recess 190 . The first portion 191 and the second portion 192 are integral.

As shown in FIG. 4, the second inner diameter Di2 indicating the inner diameter of the second portion 192 is larger than the first inner diameter Di1 indicating the inner diameter of the first portion 191.

Further, the second outer diameter Do2 indicating the outer diameter of the second portion 192 is larger than the first outer diameter Do1 indicating the outer diameter of the first portion 191.

The first inner diameter Di1 is substantially equal to the inner diameter of the stator core 30. The inner diameter of the stator core 30 is the inner diameter of the inner peripheral surface of the teeth 35. The inner circumferential surface of the teeth 35 is the innermost portion of the teeth 35 in the radial direction. The first outer diameter Do1 is substantially equal to the outer diameter of the stator core 30.

The first portion 191 covers the coil 32. First portion 191 covers at least a portion of stator core 30 . The first portion 191 covers at least a portion of the insulator 31. The first portion 191 may or may not cover the inner peripheral surface of the teeth 35.

The second portion 192 covers a portion of the insulator 31. The second portion 192 covers the busbar unit 33. The second portion 192 covers the busbar screw 53.

The resin portion 19 is arranged so as to be in contact with the inner surface of the motor case 13A. The resin portion 19 is arranged so as to contact each of the inner surface of the main body portion 60A and the inner surface (right surface) of the lid portion 62A.

In this embodiment, at least a portion of the first portion 191 contacts the inner surface of the main body portion 60A. At least a portion of the second portion 192 contacts the inner surface of the main body portion 60A. At least a portion of the second portion 192 contacts the inner surface of the lid portion 62A.

The sensor substrate 22 is placed inside the recess 190. The sensor substrate 22 is arranged radially inside the second portion 192. Base screw 78 is also located radially inwardly of second portion 192 . The sensor substrate 22 and the resin section 19 are separated from each other.

As shown in FIG. 6, the sensor substrate 22 has an outer peripheral surface 220 facing radially outward, a first surface 221 facing right, and a second surface 222 facing left. At least a portion of the first surface 221 includes a plane perpendicular to the rotation axis AX. The second surface 222 faces opposite the first surface 221. At least a portion of second surface 222 includes a plane perpendicular to rotation axis AX. At least a portion of the first surface 221 of the sensor substrate 22 faces the end surface 281 of the rotor 28 facing left. End surface 281 of rotor 28 includes an end surface of rotor core 54 facing left and an end surface of rotor magnet 55 facing left. End surface 281 includes a plane perpendicular to rotation axis AX.

Additionally, the peripheral region of the first surface 221 faces the end surface 193 of the first portion 191 facing left. End surface 193 includes a plane perpendicular to rotation axis AX.

The second surface 222 of the sensor substrate 22 faces the inner surface of the lid portion 62A facing right.

The outer peripheral surface 220 of the sensor substrate 22 is arranged to connect the radially outer end of the first surface 221 and the radially outer end of the second surface 222. The outer circumferential surface 220 of the sensor substrate 22 faces the inner circumferential surface 194 of the second portion 192 facing radially inward. At least a portion of the inner peripheral surface 194 is parallel to the rotation axis AX. The right end of the inner circumferential surface 194 and the radially outer end of the end surface 193 are connected.

The resin portion 19 has high thermal conductivity and electrical insulation. For example, if the insulator 31 is made of nylon resin and the thermal conductivity of the nylon resin is 0.2 [W/m·K], the thermal conductivity of the synthetic resin used for the resin part 19 is 0.2 [W/m·K]. W/m・K].

An example of an insulating synthetic resin having a thermal conductivity higher than 0.2 [W/m·K] is unsaturated polyester resin. Note that the resin portion 19 may be made of nylon resin containing an insulating and thermally conductive filler.

A thermally conductive material 80 (TIM: Thermal Interface Materials) is disposed between the lid portion 62A and the resin portion 19. The thermal conductivity of the thermally conductive material 80 is higher than that of the insulator 31. The thermal conductivity of the thermally conductive material 80 is higher than that of the resin portion 19. Thermally conductive material 80 is electrically insulating.

Thermal conductive material 80 contacts both lid portion 62A and resin portion 19. The thermally conductive material 80 may be a coating film applied to one or both of the lid portion 62A and the resin portion 19, or may be a solid sheet-like member. In this embodiment, the thermally conductive material 80 includes a thermally conductive sheet. In the following description, the thermally conductive material 80 will be appropriately referred to as a thermally conductive sheet 80.

As shown in FIG. 6, the thermally conductive sheet 80 has a left surface 80A that contacts the inner surface (right surface) of the lid portion 62A, and a right surface 80B that contacts the left end surface of the resin portion 19. The thermally conductive sheet 80 is placed between the lid portion 62A and the resin portion 19 in a compressed state. The heat conductive sheet 80 may be elastically deformed or may be plastically deformed. By placing the thermally conductive sheet 80 in a compressed state between the lid portion 62A and the resin portion 19, the left surface 80A is in close contact with the inner surface of the lid portion 62A, and the right surface 80B is in close contact with the left end surface of the resin portion 19. closely adhere to.

In this embodiment, the thermally conductive sheet 80 is arranged between the inner surface of the lid portion 62A and the left end surface of the second portion 192 of the resin portion 19. As shown in FIGS. 4 and 7, the thermally conductive sheet 80 has an annular shape. Thermal conductive sheet 80 is arranged so as to surround the rotation axis AX.

As shown in FIG. 6, the lid portion 62A includes a contact area 623 and a connection area 624.

The contact area 623 is a part of the inner surface of the lid portion 62A facing the internal space of the motor case 13A. Contact area 623 faces to the right. The contact area 623 contacts the left surface 80A of the thermally conductive sheet 80.

The connection region 624 is arranged radially outward from the contact region 623. Connection area 624 faces in the same direction as contact area 623. That is, the connection area 624 faces to the right. The connection area 624 faces the left end of the main body 60A. The left end of the main body 60A includes a peripheral region 604 of the main body 60A that is arranged around the insertion port 63 and faces leftward. Connection region 624 is connected to peripheral region 604 .

In this embodiment, the contact area 623 is located to the left of the connection area 624.

A recess 109 is formed in the peripheral region 604. The sealing member 26 is arranged in a recess 109 formed in the peripheral region 604. The seal member 26 seals the boundary between the peripheral area 604 of the main body 60A and the connection area 624 of the lid 62A. The seal member 26 is arranged between the main body 60A and the lid 62A in a compressed state. The seal member 26 is in close contact with each of the main body portion 60A and the lid portion 62A.

After the stator 27 is inserted into the main body 60A through the insertion port 63, the mold is inserted into the main body 60A. After the mold is inserted inside the main body portion 60A, heated and melted synthetic resin is supplied to the mold through the insertion port 63. The mold is placed inside the main body portion 60A so that the first portion 191 and the second portion 192 are formed in the resin portion 19. The resin portion 19 is formed inside the main body portion 60A by solidifying the synthetic resin supplied inside the main body portion 60A. After the stator 27 and the resin portion 19 are placed inside the main body 60A, the rotor 28 is inserted into the main body 60A through the insertion port 63. Further, after the resin portion 19 is placed inside the main body portion 60A, the thermally conductive sheet 80 is placed on the left end surface of the resin portion 19. Further, the seal member 26 is arranged in the recess 109 of the main body 60A. After the rotor 28 was placed inside the main body 60A, the thermally conductive sheet 80 was placed on the left end surface of the resin part 19, and the seal member 26 was placed in the recess 109 of the main body 60A, the sensor board 22 was fixed. The lid portion 62A and the main body portion 60A are fixed with screws 71. By fixing the lid portion 62A and the main body portion 60A with the screws 71, the thermally conductive sheet 80 is arranged between the lid portion 62A and the resin portion 19 in a compressed state. The seal member 26 is arranged between the main body 60A and the lid 62A in a compressed state.

The seal member 26 prevents foreign matter around the motor case 13A from entering the internal space of the motor case 13A. Foreign matter around the motor case 13A includes dust and moisture. The seal member 26 is arranged between the main body 60A and the lid 62A in a compressed state. Since the seal member 26 is in close contact with each of the main body portion 60A and the lid portion 62A, foreign matter around the motor case 13A is suppressed from entering the internal space of the motor case 13A.

The thermally conductive sheet 80 is placed between the resin part 19 and the lid part 62A in a compressed state. Since the thermally conductive sheet 80 is in close contact with each of the resin portion 19 and the lid portion 62A, the heat of the coil 32 is efficiently transferred to the lid portion 62A via the resin portion 19 and the thermally conductive sheet 80. The heat of the coil 32 transferred to the lid 62A is radiated from the lid 62A to the periphery of the motor case 13A.

When the peripheral region 604 and the connection region 624 are brought into contact so that the sealing member 26 is compressed, for example, due to a dimensional error in the resin portion 19, the gap between the left end surface of the resin portion 19 and the inner surface of the lid portion 62A There is a possibility that a gap may be formed. Further, when the left end surface of the resin part 19 and the inner surface of the lid part 62A are brought into contact, a gap is formed between the peripheral area 604 and the connection area 624, and the sealing member 26 may not be compressed.

In this embodiment, when the peripheral region 604 and the connection region 624 are brought into contact so that the seal member 26 is compressed, a gap is formed between the left end surface of the resin portion 19 and the inner surface of the lid portion 62A. Thus, the resin portion 19 is formed. The thickness of the heat conductive sheet 80 before being compressed is larger than the dimension of the gap between the left end surface of the resin part 19 and the inner surface of the lid part 62A. Further, the heat conductive sheet 80 can be compressively deformed (elastically deformed or plastically deformed). Therefore, when the peripheral area 604 and the connection area 624 are brought into contact so that the sealing member 26 is compressed, the thermally conductive sheet 80 is compressed by the lid part 62A and the resin part 19, and the heat conductive sheet 80 is compressed by the lid part 62A and the resin part 19. It is arranged between the left end surface and the inner surface of the lid portion 62A. The heat conductive sheet 80 is in close contact with each of the left end surface of the resin portion 19 and the contact area 623 of the lid portion 62A. Thereby, the heat of the coil 32 is efficiently transferred to the lid part 62A via the resin part 19 and the heat conductive sheet 80.

<Effect>
As described above, in the embodiment, the electric working machine 1 includes the motor 12, the saw chain 10 which is the output part, the motor case 13A, the resin part 19, the seal member 26, and the heat conductive material which is the heat conductive material. A conductive sheet 80 is provided. The motor 12 includes a stator 27 including a coil 32, a rotor 28 rotating relative to the stator 27, and a rotor shaft 29 fixed to the rotor 28. The saw chain 10 is driven by a rotor shaft 29. The motor case 13A includes a main body 60A having an insertion port 63, and a lid 62A arranged on one axial side (left side) of the main body 60A and connected to the main body 60A so as to close the insertion port 63. have Stator 27 and rotor 28 are housed in motor case 13A. The resin portion 19 covers the coil 32. The resin part 19 is housed in the motor case 13A. The seal member 26 seals the boundary between the main body portion 60A and the lid portion 62A. Thermal conductive sheet 80 is arranged between lid portion 62A and resin portion 19.

In the above configuration, the seal member 26 prevents foreign matter around the motor case 13A from entering the internal space of the motor case 13A. Foreign matter around the motor case 13A includes dust and moisture. By disposing the thermally conductive sheet 80 between the lid portion 62A and the resin portion 19, the heat of the coil 32 is transmitted to the lid portion 62A via the resin portion 19 and the thermally conductive sheet 80. The heat of the coil 32 transferred to the lid portion 62A is dissipated into the space around the motor case 13A. For example, due to a dimensional error in the resin part 19, the gap between the resin part 19 and the lid part 62A becomes large when the main body part 60A and the lid part 62A are connected so that the seal member 26 is compressed. Even if this occurs, the gap between the resin portion 19 and the lid portion 62A is filled by the heat conductive sheet 80.

In the embodiment, the thermally conductive sheet 80 contacts both the lid portion 62A and the resin portion 19.

In the above configuration, the heat of the coil 32 is efficiently transferred to the lid portion 62A via the resin portion 19 and the heat conductive sheet 80.

In embodiments, the thermally conductive material includes a thermally conductive sheet 80.

With the above configuration, a decrease in workability when arranging the thermally conductive material between the resin part 19 and the lid part 62A is suppressed.

In the embodiment, the thermally conductive sheet 80 is placed between the lid portion 62A and the resin portion 19 in a compressed state.

In the above configuration, the thermally conductive sheet 80 can be brought into close contact with each of the lid portion 62A and the resin portion 19. Therefore, the heat of the coil 32 is efficiently transferred to the lid part 62A via the resin part 19 and the heat conductive sheet 80.

In the embodiment, at least a portion of the resin portion 19 contacts the main body portion 60A.

In the above configuration, the heat of the coil 32 is efficiently transferred to the main body portion 60A via the resin portion 19. The heat of the coil 32 transferred to the main body 60A is dissipated into the space around the motor case 13A.

In the embodiment, the lid part 62A has a contact area 623 that contacts the thermally conductive sheet 80 and a connection that is connected to a peripheral area 604 of the main body part 60A that is arranged around the insertion opening 63 and faces one side (left side) in the axial direction. region 624.

In the above configuration, the heat of the coil 32 is efficiently transmitted to the lid portion 62A via the resin portion 19 and the heat conductive sheet 80, and the main body portion 60A and the lid portion 62A are properly connected.

In the embodiment, the contact area 623 is arranged on one axial side (left side) of the connection area 624.

With the above configuration, a decrease in workability when connecting the main body part 60A and the lid part 62A is suppressed. Moreover, the increase in size of the motor case 13A is suppressed.

In the embodiment, the sealing member 26 seals the boundary between the peripheral region 604 of the main body portion 60A and the connection region 624 of the lid portion 62A.

In the above configuration, the seal member 26 prevents foreign matter around the motor case 13A from entering the internal space of the motor case 13A.

In the embodiment, the seal member 26 is disposed between the main body 60A and the lid 62A in a compressed state.

In the above configuration, the seal member 26 can be brought into close contact with each of the main body portion 60A and the lid portion 62A. Therefore, foreign matter around the motor case 13A is prevented from entering the internal space of the motor case 13A.

In the embodiment, the resin portion 19 includes a first portion 191 that covers the coil 32 and a second portion 192 that is disposed on one side (left side) of the first portion 191 in the axial direction. The first portion 191 and the second portion 192 are integral. Each of the first portion 191 and the second portion 192 is cylindrical. The second inner diameter Di2 indicating the inner diameter of the second portion 192 is larger than the first inner diameter Di1 indicating the inner diameter of the first portion 191. The thermally conductive sheet 80 is arranged between the lid portion 62A and the second portion 192.

In the above configuration, the second inner diameter Di2 of the second portion 192, which is disposed on one axial side (left side) than the first portion 191, is larger than the first inner diameter Di1 of the first portion 191. Therefore, an increase in the weight of the resin portion 19 is suppressed. By suppressing an increase in the weight of the resin portion 19, an increase in the weight of the motor assembly 11A is suppressed. By suppressing an increase in the weight of the motor assembly 11A, an increase in the weight of the electric working machine 1 is suppressed.

[Second embodiment]
A second embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 8 is a perspective view from the left showing the motor assembly 11B according to this embodiment. FIG. 9 is a side view showing the motor assembly 11B according to this embodiment. FIG. 10 is a longitudinal sectional view showing the motor assembly 11B according to this embodiment. FIG. 11 is an enlarged vertical cross-sectional view of a part of the motor assembly 11B according to this embodiment.

<Motor assembly>
Motor assembly 11B includes a motor 12, a motor case 13B, a resin portion 19, and a seal member 26. The motor case 13B includes a main body 60B having an insertion port 63, and a lid 62B that is disposed on the left side of the main body 60B and connected to the main body 60B so as to close the insertion port 63. Stator 27 and rotor 28 are housed in motor case 13B. The resin part 19 is housed in the motor case 13B. Similar to the embodiment described above, the resin portion 19 includes a first portion 191 that covers the coil 32 and a second portion 192 that is disposed on the left side of the first portion 191. The seal member 26 seals the boundary between the main body portion 60B and the lid portion 62B.

Note that in this embodiment, the motor assembly 11B includes a tube 460 that bundles five signal lines 75. The sealing member 23B has three holes in which the three power lines 46 are arranged, and one hole in which the tube 460 is arranged. Similar to the embodiment described above, the seal member 23B is fixed to the motor case 13B by a fixing member 92.

As shown in FIG. 11, the lid portion 62B includes a contact area 625 and a connection area 626.

The contact area 625 is a part of the inner surface of the lid portion 62B facing the internal space of the motor case 13B. Contact area 625 faces to the right. Contact region 625 contacts left end surface 195 of resin portion 19 . In this embodiment, the end surface 195 of the resin portion 19 is the left end surface of the second portion 192.

The connection region 626 is arranged radially outward than the contact region 625. Connection area 626 faces in the same direction as contact area 625. That is, the connection area 626 faces to the right. The connection region 626 faces the left end of the main body portion 60B. The left end of the main body 60B includes a peripheral region 605 of the main body 60B that is disposed around the insertion port 63 and faces leftward. Connection region 626 is connected to peripheral region 605.

In this embodiment, the peripheral region 605 of the main body portion 60B and the end surface 195 of the resin portion 19 facing the contact region 625 are arranged in the same plane. The contact area 625 and the connection area 626 of the lid portion 62B are arranged in the same plane.

Each of the peripheral region 605 and the end surface 195 is a plane perpendicular to the rotation axis AX. In the left-right direction, the position of the peripheral region 605 and the position of the end surface 195 are the same.

Each of the contact area 625 and the connection area 626 is a plane perpendicular to the rotation axis AX. In the left-right direction, the position of the contact area 625 and the position of the connection area 626 are the same.

In a state where the end surface 195 of the resin part 19 and the contact area 625 of the lid part 62B are in contact with each other, the peripheral area 605 of the main body part 60B and the connection area 626 of the lid part 62B are in contact with each other.

A recess 109 is formed in the peripheral region 605. The sealing member 26 is arranged in a recess 109 formed in the peripheral region 605. The seal member 26 seals the boundary between the peripheral area 605 of the main body part 60B and the connection area 626 of the lid part 62B. The seal member 26 is disposed between the main body portion 60B and the lid portion 62B in a compressed state. The seal member 26 is in close contact with each of the main body portion 60B and the lid portion 62B.

After the stator 27 is inserted into the body portion 60B through the insertion port 63, at least a portion of the mold is inserted into the body portion 60B. Also, a portion of the mold is placed in contact with the peripheral area. After the mold is placed in the main body portion 60B, heated and melted synthetic resin is supplied to the mold. The mold is placed in the main body part 60B so that the first part 191 and the second part 192 are formed in the resin part 19. Moreover, the mold is arranged in the main body part 60B so that the peripheral region 605 and the end surface 195 are arranged in the same plane. The resin portion 19 is formed inside the main body portion 60B by solidifying the synthetic resin supplied to the mold. After the stator 27 and the resin part 19 are arranged inside the main body 60B, the rotor 28 is inserted into the inner side of the main body 60B through the insertion port 63. Furthermore, the seal member 26 is arranged in the recess 109 of the main body portion 60B. After the rotor 28 is placed inside the main body 60B and the seal member 26 is placed in the recess 109 of the main body 60B, the lid 62B to which the sensor board 22 is fixed and the main body 60B are fixed with screws 71. . By fixing the lid portion 62B and the main body portion 60B with the screws 71, the seal member 26 is arranged between the main body portion 60B and the lid portion 62B in a compressed state.

Since the sealing member 26 is arranged between the main body part 60B and the lid part 62B in a compressed state, it comes into close contact with each of the main body part 60B and the lid part 62B. Since the seal member 26 is in close contact with each of the main body portion 60B and the lid portion 62B, foreign matter around the motor case 13B is suppressed from entering the internal space of the motor case 13B.

In this embodiment, the peripheral region 605 of the main body portion 60B and the end surface 195 of the resin portion 19 are arranged in the same plane, and the contact region 625 and the connection region 626 are arranged in the same plane. When the peripheral region 604 and the connecting region 624 are brought into contact so that the seal member 26 is compressed, the contact region 625 and the end surface 195 are also brought into contact. Since the contact area 625 and the end surface 195 are in contact with each other, the heat of the coil 32 is efficiently transferred to the lid part 62B via the resin part 19. The heat of the coil 32 transferred to the lid 62B is dissipated from the lid 62B to the periphery of the motor case 13B.

<Effect>
As described above, in the embodiment, the lid part 62B has a contact area 625 that contacts the resin part 19, and a peripheral area 605 of the main body part 60B that is arranged around the insertion port 63 and faces one side (left side) in the axial direction. and a connection area 626 connected to the connection area 626 . The peripheral area 605 of the main body part 60B and the end surface 195 of the resin part 19 facing the contact area 625 are arranged in the same plane. Contact area 625 and connection area 626 are arranged in the same plane.

In the above configuration, since the lid portion 62B has the contact area 625 that contacts the resin portion 19, the heat of the coil 32 is efficiently transmitted to the lid portion 62B via the resin portion 19. The heat of the coil 32 transferred to the lid portion 62B is dissipated into the space around the motor case 13B. Since the peripheral area 605 of the main body part 60B and the end surface 195 of the resin part 19 are arranged in the same plane, and the contact area 625 and the connection area 626 of the lid part 62B are arranged in the same plane, the sealing member 26 is compressed. In a state where the main body part 60B and the lid part 62B are connected as shown in FIG.

In the embodiment, the peripheral area 605 of the main body part 60B and the connection area 626 of the lid part 62B are in contact with each other while the end surface 195 of the resin part 19 and the contact area 625 of the lid part 62B are in contact with each other.

In the above configuration, the heat of the coil 32 is efficiently transmitted to the lid part 62B via the resin part 19, and the main body part 60B and the lid part 62B are properly connected.

In the embodiment, the seal member 26 seals the boundary between the peripheral region 605 of the main body portion 60B and the connection region 626 of the lid portion 62B.

In the above configuration, the seal member 26 prevents foreign matter around the motor case 13B from entering the internal space of the motor case 13B.

In the embodiment, the seal member 26 is disposed between the main body portion 60B and the lid portion 62B in a compressed state.

In the above configuration, the seal member 26 can be in close contact with each of the main body portion 60B and the lid portion 62B. Therefore, foreign matter around the motor case 13B is suppressed from entering the internal space of the motor case 13B.

In the embodiment, at least a portion of the resin portion 19 contacts the main body portion 60B.

In the above configuration, the heat of the coil 32 is efficiently transferred to the main body portion 60B via the resin portion 19. The heat of the coil 32 transferred to the main body portion 60B is dissipated into the space around the motor case 13B.

In the embodiment, the resin portion 19 includes a first portion 191 that covers the coil 32 and a second portion 192 that is disposed on one side (left side) of the first portion 191 in the axial direction.

With the above configuration, an increase in the weight of the resin portion 19 is suppressed. By suppressing an increase in the weight of the resin portion 19, an increase in the weight of the motor assembly 11B is suppressed. By suppressing an increase in the weight of the motor assembly 11B, an increase in the weight of the electric working machine 1 is suppressed.

[Third embodiment]
A third embodiment will be described. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description of the components will be simplified or omitted.

FIG. 12 is a perspective view from the left showing the motor assembly 11C according to this embodiment. FIG. 13 is a side view showing a motor assembly 11C according to this embodiment. FIG. 14 is a longitudinal sectional view showing a motor assembly 11C according to this embodiment. FIG. 15 is an enlarged vertical cross-sectional view of a part of the motor assembly 11C according to this embodiment.

<Motor assembly>
The motor assembly 11C includes a motor 12, a motor case 13C, a resin portion 19, and a seal member 26. The motor case 13C includes a main body 60C having an insertion port 63, and a lid 62C that is arranged on the left side of the main body 60C and connected to the main body 60C so as to close the insertion port 63. Stator 27 and rotor 28 are housed in motor case 13C. The resin part 19 is housed in the motor case 13C. Similar to the embodiment described above, the resin portion 19 includes a first portion 191 that covers the coil 32 and a second portion 192 that is disposed on the left side of the first portion 191. The seal member 26 seals the boundary between the main body portion 60C and the lid portion 62C.

Similar to the second embodiment described above, the motor assembly 11C has a tube 460 that bundles five signal lines 75. The sealing member 23B has three holes in which the three power lines 46 are arranged, and one hole in which the tube 460 is arranged. Similar to the embodiment described above, the seal member 23B is fixed to the motor case 13C by a fixing member 92.

As shown in FIG. 15, the lid portion 62C includes a contact area 627, a facing area 628, and an inner peripheral area 629.

The contact area 627 is a part of the inner surface of the lid portion 62C facing the internal space of the motor case 13C. Contact area 627 faces to the right. Contact region 627 contacts left end surface 195 of resin portion 19 . In this embodiment, the end surface 195 of the resin portion 19 is the left end surface of the second portion 192.

Opposing region 628 is arranged radially outward from contact region 627. Opposing area 628 faces in the same direction as contact area 627. That is, the opposing region 628 faces to the right. The opposing region 628 faces the left end of the main body 60C. The left end of the main body 60C includes a peripheral region 606 of the main body 60C that is disposed around the insertion port 63 and faces leftward. Opposing region 628 faces peripheral region 606 with a gap interposed therebetween.

Inner circumferential region 629 is arranged radially outer than opposing region 628 . Inner circumferential region 629 faces radially inward. Inner peripheral region 629 is arranged to surround rotation axis AX. The left end of the inner peripheral region 629 and the radially outer peripheral edge of the opposing region 628 are connected. The inner peripheral region 629 is connected to the outer peripheral region 607 of the main body portion 60C facing radially outward.

In this embodiment, the end surface 195 of the resin part 19 facing the contact area 627 is arranged on the left side of the peripheral area 606 of the main body part 60C. The contact area 627 and the opposing area 628 of the lid portion 62C are arranged in the same plane.

Each of the peripheral region 606 and the end surface 195 is a plane perpendicular to the rotation axis AX. End surface 195 is located to the left of peripheral region 606.

Each of the contact area 627 and the opposing area 628 is a plane perpendicular to the rotation axis AX. In the left-right direction, the position of the contact area 627 and the position of the opposing area 628 are the same.

In a state where the end surface 195 of the resin part 19 and the contact area 627 of the lid part 62C are in contact, the outer peripheral area 607 of the main body part 60C and the inner peripheral area 629 of the lid part 62C are in contact.

The recessed portion 109C is formed in the outer peripheral region 607. The seal member 26 is arranged in the recess 109C formed in the outer peripheral region 607. The seal member 26 seals the boundary between the outer peripheral region 607 of the main body portion 60C and the inner peripheral region 629 of the lid portion 62C. The seal member 26 is disposed between the main body portion 60C and the lid portion 62C in a compressed state. In this embodiment, the seal member 26 is radially compressed. The seal member 26 is in close contact with each of the main body portion 60C and the lid portion 62C.

After the stator 27 is inserted into the main body 60C through the insertion port 63, the mold is inserted into the main body 60C. After the mold is placed in the main body 60C, heated and melted synthetic resin is supplied to the mold. The mold is placed in the main body part 60C so that the first part 191 and the second part 192 are formed in the resin part 19. Further, the mold is arranged in the main body portion 60C so that the end surface 195 is arranged on the left side of the peripheral region 606. By solidifying the synthetic resin supplied to the mold, the resin portion 19 is formed inside the main body portion 60C. After the stator 27 and the resin part 19 are arranged inside the main body 60C, the rotor 28 is inserted into the inner side of the main body 60C through the insertion opening 63. Further, the seal member 26 is arranged in the recess 109C of the main body 60C. After the rotor 28 is placed inside the main body 60C and the seal member 26 is placed in the recess 109C of the main body 60C, the lid 62C to which the sensor board 22 is fixed and the main body 60C are fixed with screws 71. . By fixing the lid portion 62C and the main body portion 60C with the screws 71, the seal member 26 is arranged between the main body portion 60C and the lid portion 62C in a compressed state.

Since the sealing member 26 is arranged between the main body 60C and the lid 62C in a compressed state, it is in close contact with each of the main body 60C and the lid 62C. Since the seal member 26 is in close contact with each of the main body portion 60C and the lid portion 62C, foreign matter around the motor case 13C is suppressed from entering the internal space of the motor case 13C.

In this embodiment, the sealing member 26 is arranged between the outer peripheral region 607 of the main body portion 60C and the inner peripheral region 629 of the lid portion 62C. Seal member 26 is radially compressed. For example, even if there is a dimensional error in the left-right direction (axial direction) in the resin part 19, the contact area 627 and the end surface 195 are in contact with each other so that the seal member 26 is compressed. can come into contact with. Since the contact area 627 and the end surface 195 are in contact with each other, the heat of the coil 32 is efficiently transferred to the lid portion 62C via the resin portion 19. The heat of the coil 32 transferred to the lid 62C is radiated from the lid 62C to the periphery of the motor case 13C.

<Effect>
As described above, in the embodiment, the lid part 62C has a contact area 627 that contacts the resin part 19, and a peripheral area 606 of the main body part 60C that is arranged around the insertion port 63 and faces one side (left side) in the axial direction. and an inner peripheral region 629 connected to the outer peripheral region 607 of the main body portion 60C facing radially outward.

In the above configuration, since the lid portion 62C has the contact area 627 that contacts the resin portion 19, the heat of the coil 32 is efficiently transmitted to the lid portion 62C via the resin portion 19. The heat of the coil 32 transferred to the lid portion 62C is dissipated into the space around the motor case 13C. Since the outer peripheral area 607 of the main body part 60C and the inner peripheral area 629 of the lid part 62C are connected, the resin part 19 This suppresses the gap between the lid portion 62C and the lid portion 62C from increasing.

In the embodiment, the sealing member 26 seals the boundary between the outer peripheral region 607 of the main body portion 60C and the inner peripheral region 629 of the lid portion 62C.

In the above configuration, the seal member 26 prevents foreign matter around the motor case 13C from entering the internal space of the motor case 13C.

In the embodiment, the end surface 195 of the resin part 19 facing the contact area 627 is arranged on one axial side (left side) of the peripheral area 606 of the main body part 60C. Contact area 627 and opposing area 628 are arranged in the same plane.

In the above configuration, the peripheral region 606 of the main body portion 60C and the facing region 628 of the lid portion 62C face each other with a gap therebetween, and the end surface 195 of the resin portion 19 and the contact region 627 of the lid portion 62C are in contact with each other. Due to the contact between the lid part 62C and the resin part 19, the heat of the coil 32 is efficiently transmitted to the lid part 62C via the resin part 19, and the body part 60C and the lid part 62C are connected in a state where the seal member 26 is compressed. are connected properly.

In the embodiment, the resin portion 19 includes a first portion 191 that covers the coil 32 and a second portion 192 that is disposed on one side (left side) of the first portion 191 in the axial direction.

With the above configuration, an increase in the weight of the resin portion 19 is suppressed. By suppressing an increase in the weight of the resin portion 19, an increase in the weight of the motor assembly 11C is suppressed. By suppressing an increase in the weight of the motor assembly 11C, an increase in the weight of the electric working machine 1 is suppressed.

[Other embodiments]
In the embodiment described above, the external terminal 42 and the connection terminal 47 may be omitted.

In the embodiment described above, the motor 12 is an inner rotor type brushless motor. The motor 12 may be an outer rotor type brushless motor. In an outer rotor type brushless motor, the teeth protrude radially outward from the annular yoke.

In the embodiment described above, the electric working machine 1 is a chainsaw, which is a type of gardening tool. Gardening tools are not limited to chainsaws. Examples of gardening tools include hedge trimmers, lawn mowers, grass cutters, and blowers. Moreover, the electric working machine 1 may be an electric tool. Examples of power tools include driver drills, vibrating driver drills, angle drills, impact drivers, grinders, hammers, hammer drills, circular saws, and reciprocating saws.

In the above-described embodiment, a battery pack attached to the battery attachment part is used as a power source for the electric working machine. A commercial power source (AC power source) may be used as a power source for the electric working machine.

DESCRIPTION OF SYMBOLS 1...Electric working machine, 2...Housing, 2A...Intake port, 2B...Exhaust port, 3...Front grip part, 4...Hand guard, 5...Battery cover, 6...Controller, 7...Trigger lock lever, 8...Trigger switch , 9... Guide bar, 10... Saw chain (output part), 11A... Motor assembly, 11B... Motor assembly, 11C... Motor assembly, 12... Motor, 13A... Motor case, 13B... Motor case, 13C... Motor case, 14 ...Motor housing part, 15...Battery holding part, 16...Rear grip part, 18...Bearing, 18L...Left bearing, 18R...Right bearing, 19...Resin part, 20...Cooling fan, 20A...Suction port, 20F...Blowout port , 22...Sensor board, 22A...Circuit board, 22B...Resin film, 23...Seal member, 23B...Seal member, 25...Seal member, 25L...Seal member, 25R...Seal member, 26...Seal member, 27...Stator, 28... Rotor, 29... Rotor shaft, 30... Stator core, 31... Insulator, 32... Coil, 33... Bus bar unit, 34... Yoke, 35... Teeth, 42... External terminal, 44... Short circuit member, 45... Insulating member, 46 ...Power wire, 47...Connection terminal, 52...Screw, 53...Bus bar screw, 54...Rotor core, 55...Rotor magnet, 56...Magnet hole, 57...Hollow hole, 58...Cylindrical member, 60A...Body part, 60B... Body part, 60C...Main body part, 61...Radiation fin, 62A...Lid part, 62B...Lid part, 62C...Lid part, 63...Insertion port, 69...Screw boss part, 70...Screw boss part, 71...Screw, 72 ...shaft hole, 72L...shaft hole, 72R...shaft hole, 73...fan bush, 74...magnetic sensor, 75...signal line, 78...board screw, 79...wiring passage, 80...thermal conductive sheet (thermal conductive material), 80A...left surface, 80B...right surface, 92...fixing member, 95...peripheral wall part, 96...fixing part, 99...screw, 101...peripheral wall part, 101L...peripheral wall part, 101R...peripheral wall part, 108L...stopper member, 108R...stopper Member, 109... recess, 109C... recess, 190... recess, 191... first part, 192... second part, 193... end surface, 194... inner circumferential surface, 195... end surface, 220... outer circumferential surface, 221... first surface , 222...Second surface, 281...End face, 460...Tube, 601...Cylindrical part, 602...Lead wire holding part, 603...Wall part, 604...Peripheral area, 605...Peripheral area, 606...Peripheral area, 607...Outer periphery Area, 621...Disc part, 622...Lead wire holding part, 623...Contact area, 624...Connection area, 625...Contact area, 626...Connection area, 627...Contact area, 628...Opposing area, 629...Inner peripheral area , AX...rotating shaft, Di1...first inner diameter, Di2...second inner diameter, Do1...first outer diameter, Do2...second outer diameter.

Claims (20)

A motor having a stator including a coil, a rotor rotating with respect to the stator, and a rotor shaft fixed to the rotor;
an output section driven by the rotor shaft;
The stator and the rotor are housed in the main body, the main body having an insertion port, and a lid disposed on one side of the main body in the axial direction and connected to the main body so as to close the insertion port. motor case,
a resin part that covers the coil and is housed in the motor case;
a sealing member that seals a boundary between the main body and the lid;
a thermally conductive material disposed between the lid part and the resin part;
Electric work equipment. the thermally conductive material contacts both the lid portion and the resin portion;
The electric working machine according to claim 1. The thermally conductive material includes a thermally conductive sheet.
The electric working machine according to claim 1 or claim 2. The thermally conductive sheet is arranged between the lid part and the resin part in a compressed state.
The electric working machine according to claim 3. at least a portion of the resin portion contacts the main body portion;
The electric working machine according to any one of claims 1 to 4. The lid portion includes a contact region that contacts the thermally conductive material, and a connection region that is arranged around the insertion opening and connected to a peripheral region of the main body portion facing one side in the axial direction.
The electric working machine according to any one of claims 1 to 5. The contact area is arranged on one side in the axial direction than the connection area,
The electric working machine according to claim 6. the sealing member seals a boundary between a peripheral area of the main body and a connection area of the lid;
The electric working machine according to claim 6 or 7. The sealing member is arranged between the main body part and the lid part in a compressed state.
The electric working machine according to claim 8. The resin part has a first part that covers the coil, and a second part that is disposed on one side in the axial direction from the first part,
The first part and the second part are integral,
Each of the first part and the second part is cylindrical,
The second inner diameter indicating the inner diameter of the second portion is larger than the first inner diameter indicating the inner diameter of the first portion,
the thermally conductive material is disposed between the lid and the second portion;
The electric working machine according to any one of claims 1 to 9. A motor having a stator including a coil, a rotor rotating with respect to the stator, and a rotor shaft fixed to the rotor;
an output section driven by the rotor shaft;
The stator and the rotor are housed in the main body, the main body having an insertion port, and a lid disposed on one side of the main body in the axial direction and connected to the main body so as to close the insertion port. motor case,
a resin part that covers the coil and is housed in the motor case;
a sealing member that seals a boundary between the main body part and the lid part,
The lid part includes a contact area that contacts the resin part, and a connection area that is arranged around the insertion opening and connected to a peripheral area of the main body part that faces one side in the axial direction,
A peripheral region of the main body portion and an end surface of the resin portion facing the contact region are arranged in the same plane,
the contact area and the connection area are arranged in the same plane;
Electric work equipment. A peripheral area of the main body part and a connection area of the lid part are in contact with each other while an end surface of the resin part and a contact area of the lid part are in contact with each other.
The electric working machine according to claim 11. the sealing member seals a boundary between a peripheral area of the main body and a connection area of the lid;
The electric working machine according to claim 12. The sealing member is arranged between the main body part and the lid part in a compressed state.
The electric working machine according to claim 13. at least a portion of the resin portion contacts the main body portion;
The electric working machine according to any one of claims 11 to 14. The resin part has a first part that covers the coil, and a second part that is disposed on one side in the axial direction from the first part,
The first part and the second part are integral,
Each of the first part and the second part is cylindrical,
A second inner diameter indicating an inner diameter of the second portion is larger than a first inner diameter indicating an inner diameter of the first portion,
The end surface of the resin portion includes the end surface of the second portion.
The electric working machine according to any one of claims 11 to 15. A motor having a stator including a coil, a rotor rotating with respect to the stator, and a rotor shaft fixed to the rotor;
an output section driven by the rotor shaft;
The stator and the rotor are housed in the main body, the main body having an insertion port, and a lid disposed on one side of the main body in the axial direction and connected to the main body so as to close the insertion port. motor case,
a resin part that covers the coil and is housed in the motor case;
a sealing member that seals a boundary between the main body part and the lid part,
The lid part has a contact area that contacts the resin part, a facing area that is arranged around the insertion opening and faces a peripheral area of the main body part facing one side in the axial direction, and the main body part facing radially outward. an inner circumferential region connected to an outer circumferential region of the
Electric work equipment. The sealing member seals a boundary between an outer circumferential area of the main body and an inner circumferential area of the lid.
The electric working machine according to claim 17. An end surface of the resin portion facing the contact area is arranged on one side in the axial direction than a peripheral area of the main body portion,
the contact area and the opposing area are arranged in the same plane;
The electric working machine according to claim 17 or 18. The resin part has a first part that covers the coil, and a second part that is disposed on one side in the axial direction from the first part,
The first part and the second part are integral,
Each of the first part and the second part is cylindrical,
A second inner diameter indicating an inner diameter of the second portion is larger than a first inner diameter indicating an inner diameter of the first portion,
The end surface of the resin portion includes the end surface of the second portion.
The electric working machine according to claim 19.

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