Electric work machine

Abstract

To provide an electric work machine in which a brushless motor is at least partially located in a hermetically sealed space.SOLUTION: The electric work machine comprises a brushless motor, an output unit, a motor case, a lead wire, and a first sealing member. The brushless motor has a stator, a rotor rotatable with respect to the stator, and a rotor shaft fixed to the rotor. The output unit is driven by the rotor shaft. The motor case has an internal space in which the stator and rotor are arranged. The lead wire is located in a wiring passage of the motor case, which connects the internal space to the outside space of the motor case. The first sealing member seals the boundary between the lead wire and the motor case.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The technology disclosed in this specification relates to an electric working machine.

Background Art

[0002] A cable ground assembly as disclosed in Patent Document 1 is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An electric working machine includes a brushless motor as a power source. Depending on the specifications of the electric working machine, at least a part of the brushless motor may be arranged in a sealed space.

[0005] The present disclosure aims to arrange at least a part of a brushless motor in a sealed space.

Means for Solving the Problems

[0006] This specification discloses an electric working machine. The electric working machine may include a brushless motor and an output unit. The brushless motor may include a stator, a rotor that rotates relative to the stator, and a rotor shaft fixed to the rotor. The output unit may be driven by the rotor shaft. The electric working machine may include a motor case having an internal space in which the stator and the rotor are arranged. The electric working machine may include a lead wire arranged in a wiring passage of the motor case that connects the internal space and the external space of the motor case. The electric working machine may include a first sealing member that seals the boundary between the lead wire and the motor case.

Effects of the Invention

[0007] According to the above configuration, at least a part of the brushless motor is disposed in the sealed space.

Brief Description of the Drawings

[0008]

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Best Mode for Carrying Out the Invention

[0009] In one or more embodiments, the electric power tool may include a brushless motor and an output unit. The brushless motor may include a stator, a rotor that rotates relative to the stator, and a rotor shaft fixed to the rotor. The output unit may be driven by the rotor shaft. The electric power tool may include a motor case having an internal space in which the stator and the rotor are disposed. The electric power tool may include a lead wire disposed in a wiring passage of the motor case that connects the internal space and the external space of the motor case. The electric power tool may include a first sealing member that seals a boundary between the lead wire and the motor case.

[0010] In the above configuration, the boundary between the lead wire disposed in the wiring passage of the motor case and the motor case is sealed by the first sealing member. The first sealing member makes the internal space of the motor case a sealed space. At least the stator and the rotor of the brushless motor are disposed in the sealed space. For example, in the case where the electric power tool is designed to be used exclusively outdoors, the electric power tool may get wet in the rain. Since the stator and the rotor are disposed in the sealed space of the motor case, it is possible to prevent the stator and the rotor from getting wet in the rain. Further, outdoors, there is a high possibility that foreign matter exists around the electric power tool. Since the stator and the rotor are disposed in the sealed space of the motor case, it is possible to prevent foreign matter from adhering to the stator and the rotor.

[0011] In one or more embodiments, the stator may include a stator core, an insulator that covers at least a part of the surface of the stator core, and a coil attached to the insulator. The lead wire may be connected to the coil.

[0012] In the above configuration, when the lead wire is a power supply wire connected to the coil, the boundary between the power supply wire and the motor case is sealed by the first sealing member.

[0013] In one or more embodiments, the electric power tool may include a sensor magnet disposed in an internal space and rotated by a rotor, and a magnetic sensor disposed in the internal space for detecting the sensor magnet. A lead wire may be connected to the magnetic sensor.

[0014] In the above configuration, when the lead wire is a signal wire connected to the magnetic sensor, the boundary between the signal wire and the motor case is sealed by a first sealing member.

[0015] In one or more embodiments, the first sealing member may be inserted into a wiring passage.

[0016] In the above configuration, the boundary between the lead wire and the motor case is properly sealed by the first sealing member inserted into the wiring passage.

[0017] In one or more embodiments, the first sealing member may have a hole in which the lead wire is disposed and a contact portion that contacts a protrusion of the motor case provided in the wiring passage.

[0018] In the above configuration, the boundary between the lead wire and the first sealing member is sealed by the outer surface of the lead wire contacting the inner surface of the hole. The boundary between the motor case and the first sealing member is sealed by the contact portion of the first sealing member contacting the protrusion of the motor case. Thereby, the boundary between the lead wire and the motor case is sealed by the first sealing member.

[0019] In one or more embodiments, the wiring passage may have an insertion end opening facing an external space. When the first sealing member is inserted into the wiring passage from the insertion end opening, the contact portion and the protrusion may contact each other.

[0020] In the above configuration, when the first sealing member is inserted into the wiring passage from the insertion end opening, the contact portion and the protrusion contact each other, and the boundary between the motor case and the first sealing member is sealed.

[0021] In one or more embodiments, the electric power tool may include a pressing mechanism that presses a first sealing member so that the outer surface of the lead wire and the inner surface of the hole are in close contact with each other, and presses the first sealing member against the protrusion so that the contact portion and the protrusion are in close contact with each other.

[0022] In the above configuration, by the pressing mechanism, the outer surface of the lead wire and the inner surface of the hole are in close contact with each other, and the boundary between the lead wire and the first sealing member is sealed. Further, by the pressing mechanism, the contact portion of the first sealing member and the protrusion of the motor case are in close contact with each other, and the boundary between the motor case and the first sealing member is sealed. Thereby, the boundary between the lead wire and the motor case is sealed by the first sealing member.

[0023] In one or more embodiments, the pressing mechanism may include a pressing member having a ring portion disposed around the first sealing member and a plurality of claw portions connected to the ring portion, and a cover member fixed to the motor case in a state of being in contact with the pressing member.

[0024] In the above configuration, since the cover member is fixed to the motor case, the cover member can apply pressure to the first sealing member via the pressing member. Thereby, the boundary between the lead wire and the motor case is sealed by the first sealing member.

[0025] In one or more embodiments, the claw portion may be elastically deformed radially inward of the ring portion by contact with the cover member to tighten the first sealing member.

[0026] In the above configuration, since the first sealing member is tightened radially inward by the claw portion, the outer surface of the lead wire and the inner surface of the hole are in close contact with each other.

[0027] In one or more embodiments, the first sealing member may have a support surface with which the ring portion comes into contact. The ring portion may move in the axial direction of the ring portion by contact between the claw portion and the cover member, and press the first sealing member against the protrusion.

[0028] In the above configuration, the first seal member is axially moved by the ring portion and pressed against the protrusion portion, so that the contact portion of the first seal member and the protrusion portion of the motor case are in close contact with each other.

[0029] In one or more embodiments, the cover member may have a peripheral wall portion disposed around the claw portion and a fixing portion fixed to the motor case.

[0030] In the above configuration, since the fixing portion is fixed to the motor case, the first seal member is tightened radially inward and the first seal member is pressed against the protrusion portion of the motor case.

[0031] In one or more embodiments, at least a part of the rotor shaft may be disposed in a shaft hole connecting the internal space and the external space. The electric working machine may include a second seal member that seals the boundary between the rotor shaft and the motor case.

[0032] In the above configuration, the boundary between the rotor shaft disposed in the shaft hole of the motor case and the motor case is sealed by the second seal member. The internal space of the motor case becomes a sealed space by the second seal member.

[0033] In one or more embodiments, the motor case may be disposed around the second seal member and have a peripheral wall portion that supports the second seal member.

[0034] In the above configuration, since the second seal member is supported by the peripheral wall portion, the boundary between the rotor shaft and the motor case can be stably sealed.

[0035] In one or more embodiments, the second seal member may be press-fitted between the rotor shaft and the peripheral wall portion.

[0036] In the above configuration, since the second seal member is press-fitted between the rotor shaft and the peripheral wall portion, the boundary between the rotor shaft and the motor case can be stably sealed.

[0037] In one or more embodiments, the second seal member may include an oil seal.

[0038] In the above configuration, the boundary between the rotating rotor shaft and the motor case is sealed by an oil seal.

[0039] In one or more embodiments, the motor case may include a main body portion having an insertion port into which the stator is inserted, and a lid portion disposed so as to close the insertion port and forming an internal space between the main body portion. The electric working machine may include a third seal member that seals the boundary between the main body portion and the lid portion.

[0040] In the above configuration, the boundary between the main body portion and the lid portion is sealed by the third seal member. The internal space of the motor case becomes a sealed space by the third seal member.

[0041] In one or more embodiments, the main body portion may have a recess provided so as to surround the insertion port. The third seal member may be disposed in the recess.

[0042] In the above configuration, the third seal member is positioned by the recess.

[0043] In one or more embodiments, the third seal member may include an O-ring.

[0044] In the above configuration, the boundary between the main body portion and the lid portion is sealed with a simple structure.

[0045] In one or more embodiments, the electric working machine may include a bearing that supports the rotor shaft. The bearing may be supported by the motor case.

[0046] In the above configuration, a change in the relative position between the bearing and the motor case is suppressed.

[0047] In one or more embodiments, in the internal space of the motor case, the stator may be arranged to surround at least a part of the rotor.

[0048] In the above configuration, an inner rotor type brushless motor is housed in the motor case.

[0049] 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. Also, some components may not be used.

[0050] In the embodiments, the positional relationships of the respective parts are described using the terms "left", "right", "front", "rear", "upper", and "lower". These terms indicate relative positions or directions based on the center of the electric working machine.

[0051] The electric working machine has a motor. In the embodiments, the direction parallel to the rotation axis AX of the motor is appropriately referred to as the axial direction. The radial direction of the rotation axis AX of the motor is appropriately referred to as the radial direction. The direction around the rotation axis AX of the motor is appropriately referred to as the circumferential direction or the rotation direction.

[0052] In the axial direction, a position close to or a direction approaching the center of the motor is appropriately referred to as the inner side in the axial direction, and a position far from or a direction separated from the center of the motor is appropriately referred to as the outer side in the axial direction. In the radial direction, a position close to or a direction approaching the rotation axis AX of the motor is appropriately referred to as the inner side in the radial direction, and a position far from or a direction separated from the rotation axis AX of the motor is appropriately referred to as the outer side in the radial direction. A position or a direction on one side of the circumferential direction is appropriately referred to as one side in the circumferential direction, and a position or a direction on the other side of the circumferential direction is appropriately referred to as the other side in the circumferential direction.

[0053] [First Embodiment] The first embodiment will be described.

[0054] <Electric Working Machine> FIG. 1 is a perspective view showing an electric working machine 1 according to an embodiment. In the embodiment, the electric working machine 1 is a chainsaw which is a type of outdoor power equipment.

[0055] The electric working machine 1 includes a housing 2, a front grip portion 3, a hand guard 4, a battery mounting portion 5, a controller 6, a trigger lock lever 7, a trigger switch 8, a guide bar 9, a saw chain 10, and a motor assembly 11. The motor assembly 11 has a motor 12 and a motor case 13.

[0056] The housing 2 is formed of a synthetic resin. The housing 2 has a motor housing portion 14, a battery holding portion 15, and a rear grip portion 16.

[0057] The motor housing portion 14 houses the motor assembly 11.

[0058] The battery holding portion 15 supports the battery mounting portion 5. The battery holding portion 15 is connected to the rear end portion of the motor housing portion 14.

[0059] The rear grip portion 16 is gripped by the hand of the user of the electric working machine 1. The rear grip portion 16 is connected to the rear end portion of the battery holding portion 15. A part of the rear grip portion 16 is connected to the upper part of the rear end portion of the battery holding portion 15. A part of the rear grip portion 16 is connected to the lower part of the rear end portion of the battery holding portion 15.

[0060] The front grip portion 3 is gripped by the hand of the user of the electric working machine 1. The front grip portion 3 is formed of a synthetic resin. The front grip portion 3 is a pipe-shaped member. The front grip portion 3 is connected to the battery holding portion 15. The left end portion of the front grip portion 3 is connected to the left side surface of the battery holding portion 15. The right end portion of the front grip portion 3 is connected to the right side surface of the battery holding portion 15.

[0061] The hand guard 4 protects the hand of the user who holds the front grip portion 3. The hand guard 4 is disposed in front of the front grip portion 3. The hand guard 4 is connected to the upper portion of the motor housing 14.

[0062] The battery pack 17 is mounted on the battery mounting portion 5. The battery pack 17 is detachable from the battery mounting portion 5. The battery pack 17 includes a secondary battery. In an embodiment, the battery pack 17 includes a rechargeable lithium-ion battery. The battery pack 17 functions as a power source unit of the power-operated working machine 1. The battery pack 17 can supply power to the power-operated working machine 1 when mounted on the battery mounting portion 5.

[0063] The controller 6 is housed in the battery holding portion 15. The controller 6 outputs a control signal for controlling the power-operated working machine 1. The controller 6 controls the drive current supplied from the battery pack 17 to the motor 12.

[0064] The trigger lock lever 7 is disposed on the rear grip portion 16. The user of the power-operated working machine 1 can operate the trigger lock lever 7. When the trigger lock lever 7 is operated, the trigger switch 8 becomes operable.

[0065] The trigger switch 8 is disposed on the rear grip portion 16. The user of the power-operated working machine 1 can operate the trigger switch 8 with a finger while holding the rear grip portion 16 by hand. When the trigger switch 8 is operated, a drive current is supplied to the motor 12, and the motor 12 is driven.

[0066] The guide bar 9 extends forward from the housing 2. The guide bar 9 is a plate-like member that is long in the front-rear direction.

[0067] The saw chain 10 is the output part of the electric working machine 1 driven by the motor 12. The saw chain 10 includes a plurality of cutters connected to each other. The saw chain 10 is disposed on the peripheral part of the guide bar 9. The motor 12 and the saw chain 10 are connected via a power transmission mechanism (not shown) including sprockets. When the trigger switch 8 is operated and the motor 12 is driven, the saw chain 10 moves along the peripheral part of the guide bar 9.

[0068] <Motor assembly> FIG. 2 is a perspective view from the right showing the motor assembly 11 according to the embodiment. FIG. 3 is a perspective view from the left showing the motor assembly 11 according to the embodiment. FIG. 4 is an exploded perspective view from the right showing the motor assembly 11 according to the embodiment. FIG. 5 is an exploded perspective view from the right showing the motor 12 and the motor case 13 according to the embodiment. FIG. 6 is an exploded perspective view from the left showing the motor 12 and the motor case 13 according to the embodiment. FIG. 7 is a longitudinal sectional view showing the motor assembly 11 according to the embodiment, corresponding to the sectional view taken along the line A-A in FIG. 3. FIG. 8 is a cross-sectional view showing the motor assembly 11 according to the embodiment, corresponding to the sectional view taken along the line B-B in FIG. 3.

[0069] The motor assembly 11 has a motor 12, a motor case 13, a bearing 18, a heat transfer resin part 19, a cooling fan 20, a sensor magnet 21, a sensor substrate 22, a first seal member 23, a press mechanism 24, a second seal member 25, and a third seal member 26.

[0070] (Motor) The motor 12 is the power source of the electric working machine 1. The motor 12 rotates based on the drive current supplied from the battery pack 17.

[0071] 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 fixed to the rotor 28. The stator 27 is arranged so as to surround at least a part of the rotor 28. The rotor 28 rotates about the rotation axis AX. The source chain 10 is driven by the rotor shaft 29.

[0072] In the embodiment, the rotation axis AX of the motor 12 extends in the left - right direction. The axial direction and the left - right direction are parallel. In the following description, one side in the axial direction is appropriately referred to as the left side, and the other side in the axial direction is appropriately referred to as the right side.

[0073] FIG. 9 is a perspective view from the right showing the stator 27 according to the embodiment. As shown in FIGS. 4, 5, 6, 7, 8, and 9, the stator 27 includes a stator core 30, an insulator 31, a coil 32, and a bus bar unit 33.

[0074] The stator core 30 includes a plurality of laminated steel plates. The steel plates are metal plates mainly made of iron. The stator core 30 has an annular yoke 34 and teeth 35 protruding radially inward from the inner surface of the yoke 34. The yoke 34 is arranged so as to surround the rotation axis AX. A plurality of teeth 35 are arranged in the circumferential direction. In the embodiment, 12 teeth 35 are arranged. The plurality of teeth 35 are arranged at equal intervals in the circumferential direction.

[0075] The insulator 31 covers at least a part of the surface of the stator core 30. The insulator 31 is made of synthetic resin. The insulator 31 is fixed to the stator core 30. The insulator 31 is integrally formed with the stator core 30. The insulator 31 is fixed to the stator core 30 by insert molding.

[0076] The insulator 31 has a tooth covering portion 36, a coil stopping portion 37, a peripheral wall portion 38, a wire supporting portion 39, and a screw boss portion 40.

[0077] As shown in FIG. 8, the tooth covering portion 36 covers the outer peripheral surface of the tooth 35. The inner wall surface of the tooth 35 facing radially inward is not covered by the tooth covering portion 36. The inner wall surface of the tooth 35 is exposed.

[0078] As shown in FIG. 9, the coil stopper portion 37 is arranged to surround the inner wall surface of the tooth 35. The coil stopper portion 37 is connected to the inner end portion of the tooth covering portion 36 on the radially inner side. At least a part of the coil stopper portion 37 protrudes axially outward from the outer peripheral surface of the tooth 35.

[0079] The peripheral wall portion 38 is arranged on the end surface of the yoke 34 facing the axial direction. The peripheral wall portion 38 is connected to the outer end portion of the tooth covering portion 36 on the radially outer side. The peripheral wall portion 38 protrudes axially outward from the end surface of the yoke 34. As shown in FIGS. 7 and 9, the peripheral wall portion 38 includes a peripheral wall portion 38L arranged on the left end surface of the yoke 34 and a peripheral wall portion 38R arranged on the right end surface of the yoke 34.

[0080] The wire support portion 39 is provided on the peripheral wall portion 38R. A plurality of wire support portions 39 are provided. The wire support portion 39 is arranged radially outside the coil 32. The wire support portion 39 includes an inner protruding portion 39A and an outer protruding portion 39B arranged radially outside the inner protruding portion 39A. Each of the inner protruding portion 39A and the outer protruding portion 39B protrudes rightward from the peripheral wall portion 38R.

[0081] The screw boss portion 40 is provided on the peripheral wall portion 38R. A plurality of screw boss portions 40 are arranged around the rotation axis AX. In the embodiment, five screw boss portions 40 are provided at intervals in the circumferential direction. A screw hole is formed in each of the screw boss portions 40.

[0082] The coil 32 is mounted on the insulator 31. The coil 32 is fixed to the insulator 31. The coil 32 and the stator core 30 are insulated by the insulator 31. The coil 32 is wound around the teeth 35 via the tooth covering portion 36 of the insulator 31. A plurality of coils 32 are provided. In the embodiment, 12 coils 32 are provided.

[0083] In the radial direction, a part of the coil 32 is disposed between the coil stop portion 37 and the peripheral wall portion 38. With the coil 32 wound around the tooth covering portion 36, the coil stop portion 37 is disposed radially inward of the coil 32. The coil stop portion 37 faces the end face of the radially inner coil 32. With the coil 32 wound around the tooth covering portion 36, the peripheral wall portion 38 is disposed radially outward of the coil 32. The peripheral wall portion 38 faces the end face of the radially outer coil 32.

[0084] The plurality of coils 32 are formed by winding a wire 41. The coils 32 adjacent to each other in the circumferential direction are connected by the wire 41 protruding from the coil 32. The wire 41 protruding from the coil 32 is supported by the insulator 31.

[0085] The wire 41 protruding from the coil 32 is supported by the wire support portion 39 of the insulator 31. The wire 41 protruding from the coil 32 is disposed between the inner protruding portion 39A and the outer protruding portion 39B.

[0086] The bus bar unit 33 is fixed to the insulator 31. The drive current from the battery pack 17 is supplied to the bus bar unit 33 via the controller 6. The drive current supplied from the battery pack 17 to the bus bar unit 33 is controlled by the controller 6.

[0087] FIG. 10 is a perspective view showing the connection structure of the coil 32 according to the embodiment. As shown in FIGS. 7, 9, and 10, the bus bar unit 33 includes an external terminal 42, a fusing terminal 43, a short-circuit member 44, and an insulating member 45.

[0088] The external terminal 42 is connected to the battery pack 17 via the controller 6. The drive current from the battery pack 17 is supplied to the external terminal 42 via the power line 46 and the connection terminal 47. In the embodiment, three external terminals 42 are provided.

[0089] The fusing terminal 43 is connected to the wire 41 protruding from the coil 32. The fusing terminal 43 is a conductive member. The wire 41 protruding from the coil 32 is connected to the fusing terminal 43 while being supported by the wire support portion 39 of the insulator. The wire 41 protruding from the coil 32 is disposed inside the bent portion of the fusing terminal 43. The fusing terminal 43 and the wire 41 protruding from the coil 32 are welded. By welding the fusing terminal 43 and the wire 41 protruding from the coil 32, the fusing terminal 43 is connected to the coil 32 via the wire 41.

[0090] A plurality of fusing terminals 43 are arranged around the rotation axis AX. In the axial direction, the positions of the plurality of fusing terminals 43 are equal. In the embodiment, six fusing terminals 43 are provided.

[0091] The short - circuit member 44 connects (shorts) a pair of wires 41 facing each other in the radial direction. The pair of wires 41 facing each other in the radial direction are separated by 180[°] in the circumferential direction. The short - circuit member 44 connects the external terminal 42 and the fusing terminal 43. The short - circuit member 44 is a conductive member. In a plane orthogonal to the rotation axis AX, the short - circuit member 44 is curved. A plurality of short - circuit members 44 are provided. In the embodiment, three short - circuit members 44 are provided. The short - circuit member 44 connects (shorts) one external terminal 42 and two fusing terminals 43.

[0092] The insulating member 45 is made of synthetic resin. The insulating member 45 is provided so as to surround the rotating shaft AX. The short-circuit member 44 is disposed inside the insulating member 45. In FIG. 9, the short-circuit member 44 is not shown. The insulating member 45 supports the external terminal 42 and the short-circuit member 44. The fusing terminal 43 is supported by the insulating member 45 via the short-circuit member 44. The insulating member 45 has a base portion 48, a screw boss portion 49, and a connecting portion 50.

[0093] The base portion 48 is annular. At least a part of the short-circuit member 44 is disposed inside the base portion 48. The base portion 48 is integrally formed with the short-circuit member 44. The short-circuit member 44 is molded with the synthetic resin forming the base portion 48. Note that the base portion 48 may be fixed to the short-circuit member 44 by insert molding, for example. By the base portion 48, the three short-circuit members 44 are insulated from each other.

[0094] The screw boss portion 49 projects radially outward from the outer edge portion of the base portion 48. A plurality of screw boss portions 49 are provided in the circumferential direction. In the embodiment, five screw boss portions 49 are provided. An opening is formed in the screw boss portion 49.

[0095] The connecting portion 50 projects upward from the upper portion of the base portion 48. The connecting portion 50 has three recesses 51 in which each of the three external terminals 42 is disposed. In the connecting portion 50, the external terminal 42 and the connection terminal 47 are fixed by a screw 52.

[0096] The drive current from the battery pack 17 is supplied to the external terminal 42 of the bus bar unit 33 via the controller 6, the power line 46, and the connection terminal 47. The drive current supplied from the battery pack 17 to the external terminal 42 flows through the short-circuit member 44 and the fusing terminal 43, and then is supplied to the coil 32 via the wire 41 protruding from the coil 32.

[0097] In the embodiment, the drive current supplied from the battery pack 17 to the motor 12 includes a U-phase drive current, a V-phase drive current, and a W-phase drive current.

[0098] The power supply line 46 includes a power supply line 46U through which a U-phase drive current flows, a power supply line 46V through which a V-phase drive current flows, and a power supply line 46W through which a W-phase drive current flows.

[0099] The connection terminal 47 includes a connection terminal 47U connected to the power supply line 46U, a connection terminal 47V connected to the power supply line 46V, and a connection terminal 47W connected to the power supply line 46W.

[0100] The external terminal 42 includes an external terminal 42U connected to the connection terminal 47U, an external terminal 42V connected to the connection terminal 47V, and an external terminal 42W connected to the connection terminal 47W.

[0101] The short-circuit member 44 includes a short-circuit member 44U connected to the external terminal 42U, a short-circuit member 44V connected to the external terminal 42V, and a short-circuit member 44W connected to the external terminal 42W.

[0102] The fusing terminal 43 includes a pair of fusing terminals 43U connected to the short-circuit member 44U, a pair of fusing terminals 43V connected to the short-circuit member 44V, and a pair of fusing terminals 43W connected to the short-circuit member 44W.

[0103] The short-circuit member 44U connects the external terminal 42U and each of the pair of fusing terminals 43U. The short-circuit member 44V connects the external terminal 42V and each of the pair of fusing terminals 43V. The short-circuit member 44W connects the external terminal 42W and each of the pair of fusing terminals 43W. The external terminal 42U, the fusing terminal 43U, and the short-circuit member 44U are a single member. The external terminal 42V, the fusing terminal 43V, and the short-circuit member 44V are a single member. The external terminal 42W, the fusing terminal 43W, and the short-circuit member 44W are a single member.

[0104] Each of the 12 coils 32 is assigned to one of the U (U-V) phase, V (V-W) phase, and W (W-U) phase. That is, the coil 32 connected to the fusing terminal 43U via the wire 41 is assigned to the U-phase coil. The coil 32 connected to the fusing terminal 43V via the wire 41 is assigned to the V-phase coil. The coil 32 connected to the fusing terminal 43W via the wire 41 is assigned to the W-phase coil.

[0105] The insulator 31 and the bus bar unit 33 are fixed by the screw 53. With the middle part of the screw 53 disposed in the opening of the screw boss portion 49, the insulator 31 and the bus bar unit 33 are fixed by the screw 53 when the tip of the screw 53 is coupled to the screw hole of the screw boss portion 40.

[0106] As shown in FIGS. 4, 7, and 8, the rotor 28 has a rotor core 54 and a rotating magnet 55.

[0107] The rotor core 54 includes a plurality of laminated steel plates. The steel plate is a metal plate mainly composed of iron. The rotor core 54 is disposed so as to surround the rotation axis AX. The stator core 30 is disposed around the rotor core 54.

[0108] The rotating magnet 55 is a permanent magnet. The rotating magnet 55 is supported by the rotor core 54. The rotating magnet 55 is disposed inside the rotor core 54. A plurality of rotating magnets 55 are arranged around the rotation axis AX.

[0109] The rotor core 54 has a plurality of magnet holes 56 provided at intervals in the circumferential direction. The magnet holes 56 are formed so as to penetrate the left and right end faces of the rotor core 54. The rotating magnet 55 is disposed in the magnet holes 56. In the embodiment, the number of the magnet holes 56 is eight. Eight rotating magnets 55 are arranged at intervals in the circumferential direction.

[0110] In an embodiment, the rotor core 54 has a plurality of hollow holes 57 provided at intervals in the circumferential direction. The hollow holes 57 are formed so as to penetrate the left end face and the right end face of the rotor core 54. The hollow holes 57 are provided radially inward of the magnet holes 56. In the embodiment, four hollow holes 57 are provided at intervals in the circumferential direction. The hollow holes 57 reduce the weight of the rotor core 54.

[0111] The rotor shaft 29 extends in the axial direction. The central axis of the rotor shaft 29 coincides with the rotation axis AX. The rotor shaft 29 is disposed inside the rotor core 54. The rotor core 54 and the rotor shaft 29 are fixed. As shown in FIG. 7, in the embodiment, a cylindrical member 58 is disposed around the rotor shaft 29. The rotor shaft 29 is fixed to the rotor core 54 via the cylindrical member 58. The left portion of the rotor shaft 29 protrudes leftward from the left end face of the rotor core 54. The right portion of the rotor shaft 29 protrudes rightward from the right end face of the rotor core 54.

[0112] When a drive current is supplied from the battery pack 17 to the coil 32 via the controller 6, a rotating magnetic field is generated in the stator 27. When a rotating magnetic field is generated in the stator 27, the rotor 28 having the rotating magnet 55 rotates.

[0113] (Motor case) The motor case 13 houses at least a part of the motor 12. In the embodiment, the motor case 13 houses the stator 27 and the rotor 28. The motor case 13 has an internal space 59 in which the stator 27 and the rotor 28 are disposed. In the internal space 59 of the motor case 13, the stator 27 is disposed so as to surround at least a part of the rotor 28. The internal space 59 is a closed space. In the embodiment, the internal space 59 is a substantially sealed closed space. A part of the rotor shaft 29 is disposed in the internal space 59.

[0114] In the embodiment, the motor case 13 includes a main body portion 60, heat radiation fins 61, and a lid portion 62.

[0115] The main body 60 houses the stator 27 and the rotor 28. The stator 27 and the rotor 28 are disposed inside the main body 60. The main body 60 has an insertion port 63 into which the stator 27 is inserted.

[0116] The heat dissipation fins 61 are disposed on the outer surface of the main body 60. The outer surface of the main body 60 is disposed so as to surround the rotation axis AX. The heat dissipation fins 61 are disposed so as to extend in the axial direction on the outer surface of the main body 60. A plurality of heat dissipation fins 61 are provided at intervals in the circumferential direction.

[0117] The lid portion 62 is disposed so as to close the insertion port 63 of the main body 60. The main body 60 and the lid portion 62 are connected so that the insertion port 63 is closed by the lid portion 62, whereby an internal space 59 is formed between the main body 60 and the lid portion 62. After at least a part of the motor 12 including the stator 27 is disposed inside the main body 60, at least a part of the motor 12 is disposed in the internal space 59 by closing the insertion port 63 of the main body 60 with the lid portion 62.

[0118] As shown in FIG. 5, a support surface 64 is provided inside the main body 60. The support surface 64 faces rightward. The support surface 64 is annular and surrounds the rotation axis AX. A screw hole 65 is provided in the support surface 64. Four screw holes 65 are provided at intervals in the circumferential direction. With at least a part of the washer 66 in contact with the right end surface of the stator core 30, the screw 67 is coupled to the screw hole 65 via the washer 66. At least a part of the washer 66 is disposed radially inward of the support surface 64. By the contact between the stator core 30 and the washer 66, the stator 27 and the main body 60 are positioned in both the axial direction and the circumferential direction.

[0119] Also, a plurality of convex portions 68 are provided on the inner surface of the main body 60. The convex portions 68 protrude radially inward from the inner surface of the main body 60. A plurality of convex portions 68 are provided at intervals in the circumferential direction. By the contact between the outer surface of the stator core 30 and the convex portions 68, the stator 27 and the main body 60 are positioned in both the radial direction and the circumferential direction.

[0120] A plurality of screw bosses 69 are provided around the insertion opening 63 in the main body 60. In this embodiment, four screw bosses 69 are provided at intervals in the circumferential direction. A threaded hole is provided in each of the plurality of screw bosses 69. A plurality of screw bosses 70 are provided around the periphery of the lid 62. In this embodiment, four screw bosses 70 are provided at intervals in the circumferential direction. An opening is provided in each of the plurality of screw bosses 70. With the middle portion of a screw 71 positioned in the opening of the screw boss 70, the tip of the screw 71 is coupled to the threaded hole of the screw boss 69, thereby fixing the main body 60 and the lid 62 together.

[0121] 5, the internal space 59 includes a circular space 59A in which the stator core 30 is disposed, and a protruding space 59B in which the connecting portion 50 of the insulator 31 is disposed. The protruding space 59B is defined above the circular space 59A. The protruding space 59B is defined so as to protrude upward from the circular space 59A.

[0122] The main body 60 includes a cylindrical portion 60A that defines a circular space 59A, a protruding portion 60B that defines a protruding space 59B, and a wall portion 60C that is connected to the left end of the cylindrical portion 60A. The protruding portion 60B is disposed on the upper portion of the cylindrical portion 60A. The protruding portion 60B is provided so as to protrude upward from the cylindrical portion 60A.

[0123] The lid portion 62 includes a disk portion 62A connected to the cylindrical portion 60A and an overhang portion 62B connected to the overhang portion 60B. The overhang portion 62B is disposed on the upper portion of the disk portion 62A. The overhang portion 62B is provided so as to protrude upward from the disk portion 62A.

[0124] The motor case 13 is made of metal. The thermal conductivity of the motor case 13 is higher than that of the stator core 30. In this embodiment, the motor case 13 is made of aluminum. The stator core 30 is made of steel containing iron as its main component. The thermal conductivity of the motor case 13 is approximately 236 [W / (m·K)]. The thermal conductivity of the stator core 30 is approximately 84 [W / (m·K)].

[0125] Note that the motor case 13 may be made of aluminum die-cast (ADC12). When the motor case 13 is made of aluminum die-cast (ADC12), the thermal conductivity of the motor case 13 is about 96 [W / (m·K)].

[0126] Note that the thermal conductivity of the motor case 13 is preferably 100 [W / (m·K)] or more, and more preferably 200 [W / (m·K)] or more. By using the motor case 13 with a high thermal conductivity, a high heat dissipation effect can be expected.

[0127] (Bearing) The bearing 18 supports the rotor shaft 29. The rotor shaft 29 is rotatably supported by the bearing 18. The bearing 18 is supported by the motor case 13.

[0128] The motor case 13 has a shaft hole 72 in which at least a part of the rotor shaft 29 is disposed. The shaft hole 72 is provided so as to connect the internal space 59 of the motor case 13 and the external space of the motor case 13. In the embodiment, the shaft hole 72 includes a shaft hole 72L in which the left part of the rotor shaft 29 is disposed and a shaft hole 72R in which the right part of the rotor shaft 29 is disposed. The shaft hole 72L is provided in the wall portion 60C of the main body portion 60. The shaft hole 72R is provided in the disc portion 62A of the lid portion 62.

[0129] The motor case 13 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 in the wall portion 60C of the main body portion 60. The peripheral wall portion 101L protrudes leftward from the left surface of the wall portion 60C. The peripheral wall portion 101R is provided in the disc portion 62A of the lid portion 62. The peripheral wall portion 101R protrudes rightward from the right surface of the disc portion 62A.

[0130] The bearings 18 include a left bearing 18L that supports a left portion of the rotor shaft 29 and a right bearing 18R that supports a right portion of the rotor shaft 29. The left bearing 18L is disposed in the shaft hole 72L. The right bearing 18R is disposed in the shaft hole 72R.

[0131] The left and right ends of the rotor shaft 29 are disposed outside the motor case 13. At least one of the left and right ends of the rotor shaft 29 is connected to the saw chain 10 via a power transmission mechanism (not shown). The saw chain 10 is driven by the rotor shaft 29. The saw chain 10 is driven by the rotation of the rotor shaft 29.

[0132] (heat transfer resin part) The heat-transfer resin part 19 is housed in the motor case 13. The heat-transfer resin part 19 contacts each of the coil 32 and the motor case 13. The heat-transfer resin part 19 is arranged so as to cover the coil 32. In the embodiment, the heat-transfer resin part 19 contacts each of the stator core 30 and the insulator 31.

[0133] The heat-transfer resin portion 19 is made of synthetic resin. The heat-transfer resin portion 19 has high thermal conductivity and insulating properties (electrical insulating properties). For example, if the insulator 31 is made of nylon resin, which has a thermal conductivity of 0.2 W / m K, the thermal conductivity of the synthetic resin used for the heat-transfer resin portion 19 is higher than 0.2 W / m K.

[0134] An example of an insulating synthetic resin having a thermal conductivity higher than 0.2 W / m K is unsaturated polyester resin. The heat-transfer resin portion 19 may be made of nylon resin containing an insulating, thermally conductive filler.

[0135] After the stator 27 is inserted into the inside of the main body 60 through the insertion opening 63, heated and melted synthetic resin is supplied into the inside of the main body 60 through the insertion opening 63. The synthetic resin supplied into the inside of the main body 60 is solidified to form the heat transfer resin part 19.

[0136] (Cooling fan) The cooling fan 20 is disposed outside the motor case 13. The cooling fan 20 faces at least a part of the outer surface of the motor case 13. The cooling fan 20 is fixed to the rotor shaft 29. The cooling fan 20 is rotated by the rotor shaft 29.

[0137] In an embodiment, the cooling fan 20 is disposed to the right of the motor case 13. The cooling fan 20 is fixed to the right end portion of the rotor shaft 29 disposed outside the motor case 13. The cooling fan 20 is disposed so as to face at least a part of the lid portion 62.

[0138] In an embodiment, the cooling fan 20 is a centrifugal fan. The cooling fan 20 includes a first plate 20B having a suction port 20A, a second plate 20D having an opening 20C, and a plurality of blades 20E disposed between the first plate 20B and the second plate 20D. An air outlet 20F is defined between the peripheral edge of the first plate 20B and the peripheral edge of the second plate 20D.

[0139] The cooling fan 20 generates a flow of air for cooling the motor case 13. When the rotor shaft 29 rotates, the cooling fan 20 rotates together with the rotor shaft 29. When the cooling fan 20 rotates, the 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 air outlet 20F. At least a part of the air blown out from the air outlet 20F hits the outer surface of the motor case 13. Thereby, the motor case 13 is cooled.

[0140] In an 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 connecting the rotor shaft 29 and the cooling fan 20. The fan bush 73 is disposed outside the motor case 13 so as to connect the right end portion of the rotor shaft 29 and the cooling fan 20. When the cooling fan 20 rotates, the fan bush 73 rotates together with the cooling fan 20.

[0141] The fan bush 73 has a disk portion 73A disposed to the left of the cooling fan 20 and a cylindrical portion 73B inserted into the opening 20C of the cooling fan 20. The cylindrical portion 73B has a support hole 73C into which the right end portion of the rotor shaft 29 is inserted.

[0142] The cooling fan 20 is made of synthetic resin. As the synthetic resin forming the cooling fan 20, nylon resin is exemplified. The fan bush 73 is made of metal. As the metal forming the fan bush 73, iron is exemplified.

[0143] (Magnet for sensor) The sensor magnet 21 is disposed outside the motor case 13. The sensor magnet 21 is a permanent magnet. The sensor magnet 21 is rotated by the rotor shaft 29.

[0144] The sensor magnet 21 is fixed to a rotating member fixed to an end portion of the rotor shaft 29 disposed outside the motor case 13. As the rotating member, the cooling fan 20 or the fan bush 73 is exemplified. In the embodiment, the sensor magnet 21 is fixed to the fan bush 73. The sensor magnet 21 is fixed to the cooling fan 20 via the fan bush 73.

[0145] A plurality of sensor magnets 21 are arranged at intervals in the circumferential direction. In the embodiment, the sensor magnets 21 are fixed to the disk portion 73A of the fan bush 73. The sensor magnets 21 are disposed inside the disk portion 73A. A plurality of sensor magnets 21 are arranged around the rotation axis AX.

[0146] The disk portion 73A has a plurality of magnet holes 73D provided at intervals in the circumferential direction. The magnet holes 73D are formed so as to penetrate the left end face and the right end face of the disk portion 73A. The sensor magnets 21 are disposed in the magnet holes 73D. In the embodiment, the number of the magnet holes 73D is eight. Eight sensor magnets 21 are arranged at intervals in the circumferential direction.

[0147] (Sensor substrate) Fig. 11 is a vertical cross-sectional view showing the vicinity of the sensor substrate 22 according to the embodiment. Fig. 12 is a perspective view showing the sensor substrate 22 according to the embodiment. Fig. 13 is an exploded perspective view showing the sensor substrate 22 according to the embodiment.

[0148] As shown in Figures 4, 7, 11, 12, and 13, the sensor board 22 is arranged outside the motor case 13. The sensor board 22 supports a magnetic sensor 74. The magnetic sensor 74 is arranged outside the motor case 13. The magnetic sensor 74 detects the sensor magnet 21. An example of the magnetic sensor 74 is a Hall element. The magnetic sensor 74 detects the rotation of the rotor 28 by detecting the sensor magnet 21. Signal lines 75 are 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 the signal lines 75.

[0149] In the axial direction, the sensor board 22 is disposed between at least a portion of the motor case 13 and the cooling fan 20. In the axial direction, the sensor board 22 is disposed between at least a portion of the motor case 13 and the sensor magnet 21. In the embodiment, the sensor board 22 is disposed between the disk portion 62A of the lid portion 62 and the fan bushing 73. A magnetic sensor 74 supported by the sensor board 22 is disposed between the motor case 13 and the cooling fan 20. The magnetic sensor 74 is disposed on the right surface of the sensor board 22. The magnetic sensor 74 is disposed so as to face the sensor magnet 21.

[0150] The sensor substrate 22 is annular. In this embodiment, notches 22A are provided on the periphery of the sensor substrate 22. Three notches 22A are provided at intervals in the circumferential direction. The sensor substrate 22 also has a plurality of holes 22B. The holes 22B are formed so as to penetrate the left and right surfaces of the sensor substrate 22.

[0151] The magnetic sensor 74 and at least a portion of the surface of the sensor substrate 22 are covered with a resin film 76. The resin film 76 is arranged so as to cover each of the left and right surfaces of the sensor substrate 22. Not only the magnetic sensor 74 but also a plurality of electronic components 77 are mounted on the surface of the sensor substrate 22. Examples of the electronic components 77 mounted on the surface of the sensor substrate 22 include a capacitor, a resistor, or a thermistor. The resin film 76 is arranged so as to cover the electronic components 77 as well.

[0152] The three notches 22A are not covered with the resin film 76. Furthermore, the two holes 22B are not covered with the resin film 76. The surface of the sensor substrate 22 is exposed at the notches 22A and around the notches 22A. The surface of the sensor substrate 22 is exposed at the holes 22B and around the holes 22B.

[0153] The resin film 76 has insulating properties and magnetic field permeability. The resin film 76 protects the sensor substrate 22, the magnetic sensor 74, and the electronic components 77. The resin film 76 is formed by low-temperature, low-pressure injection molding. A heated and melted synthetic resin is extruded into a mold in which the sensor substrate 22 is placed at a low pressure of 0.1 MPa or more and 10 MPa or less, and is integrally molded with the sensor substrate 22. The synthetic resin forming the resin film 76 is preferably a thermoplastic resin having a softening point of less than 200°C, and more preferably a thermoplastic resin having a melting point of less than 200°C. An example of a synthetic resin forming the resin film 76 is a synthetic resin whose main component (majority by weight) is polyamide (nylon) having an aliphatic skeleton.

[0154] In the embodiment, the sensor substrate 22 is disposed around the periphery of the peripheral wall portion 101R.

[0155] The sensor substrate 22 is fixed to the motor case 13. The disc portion 62A of the lid portion 62 has screw boss portions 62D. Three screw boss portions 62D are provided on the disc portion 62A. Screw holes are provided in each of the three screw boss portions 62D. Further, the disc portion 62A of the lid portion 62 has positioning pins 62E. Two positioning pins 62E are provided on the disc portion 62A. The positioning pins 62E project rightward from the right surface of the disc portion 62A. In the embodiment, the positioning pins 62E are disposed in openings provided in the disc portion 62A.

[0156] The sensor substrate 22 is fixed to the lid portion 62 by screws 78. The sensor substrate 22 is connected to the lid portion 62 such that the positioning pins 62E are disposed in each of the two holes 22B of the sensor substrate 22, and the screw boss portions 62D are disposed in each of the three notches 22A of the sensor substrate 22. After the sensor substrate 22 is connected to the lid portion 62, the tip of the screw 78 is coupled to the screw hole of the screw boss portion 62D. The sensor substrate 22 is sandwiched between the head of the screw 78 and the right end surface of the screw boss portion 62D. Thereby, the sensor substrate 22 is fixed to the lid portion 62 by the screws 78.

[0157] (First seal member and pressing mechanism) FIG. 14 is a perspective view showing the first seal member 23 and the pressing mechanism 24 according to the embodiment. FIG. 15 is an exploded perspective view showing the first seal member 23 and the pressing mechanism 24 according to the embodiment. FIG. 16 is an exploded perspective sectional view of the first seal member 23 and the pressing mechanism 24 according to the embodiment. FIG. 17 is a sectional view showing the first seal member 23 and the pressing mechanism 24 according to the embodiment. FIG. 18 is a sectional view showing the first seal member 23 and the pressing mechanism according to the embodiment, corresponding to a sectional view taken along the arrow C-C line in FIG. 17.

[0158] The motor case 13 has a wiring passage 79 that connects the internal space 59 of the motor case 13 and the external space of the motor case 13. The wiring passage 79 is provided in the overhanging portion 60B of the main body portion 60. In the embodiment, a cylindrical portion 60D is provided in the overhanging portion 60B. The cylindrical portion 60D protrudes upward from the overhanging portion 60B. At least a part of the wiring passage 79 is defined by the cylindrical portion 60D.

[0159] A power line 46 is arranged in the wiring passage 79. The power line 46 is a kind of lead wire. The power line 46 is connected to the coil 32 via the connection terminal 47 and the bus bar unit 33.

[0160] The first seal member 23 seals the boundary between the power line 46 and the motor case 13.

[0161] The first seal member 23 is substantially cylindrical. The central axis CX of the first seal member 23 extends in the vertical direction. The first seal member 23 is made of rubber. The first seal member 23 is arranged in the wiring passage 79. The wiring passage 79 has an insertion end opening 80 facing the external space of the motor case 13. In the embodiment, the insertion end opening 80 is arranged at the upper end portion of the cylindrical portion 60D. The first seal member 23 is inserted into the wiring passage 79 from the insertion end opening 80. That is, the first seal member 23 is inserted into the inside of the cylindrical portion 60D from above the cylindrical portion 60D.

[0162] The first seal member 23 has holes 81 in which the power lines 46 are arranged. The holes 81 are formed so as to penetrate the upper surface 82 and the lower surface 83 of the first seal member 23. Three holes 81 are provided. The three holes 81 are provided parallel to each other. There are three power lines 46. One power line 46 is arranged in one hole 81. The power lines 46 are arranged in each of the three holes 81. The outer surface of the power line 46 and the inner surface of the hole 81 are in close contact.

[0163] The first seal member 23 has a first portion 84, a second portion 85 disposed below the first portion 84, and a third portion 86 disposed below the second portion 85. The diameter of the second portion 85 is larger than the diameter of the first portion 84. The diameter of the third portion 86 is larger than the diameter of the second portion 85.

[0164] A step is provided at the boundary between the first portion 84 and the second portion 85. A tapered surface 87 is provided at the boundary between the first portion 84 and the second portion 85. The tapered surface 87 slopes downward toward the radially outer side of the central axis CX of the first seal member 23.

[0165] A step is provided at the boundary between the second portion 85 and the third portion 86. A support surface 88 is provided at the boundary between the second portion 85 and the third portion 86. The support surface 88 faces upward. In a plane orthogonal to the central axis CX, the support surface 88 is annular.

[0166] As shown in FIG. 17, the motor case 13 has a protrusion 89 facing the wiring passage 79. The protrusion 89 is provided on the inner surface of the wiring passage 79. The protrusion 89 protrudes toward the center (central axis CX) of the wiring passage 79 and upward. In a plane orthogonal to the central axis CX, the protrusion 89 is annular. The lower surface 83 of the first seal member 23 can contact the protrusion 89. The lower surface 83 includes a contact portion that contacts the protrusion 89 of the motor case 13. As described above, the protrusion 89 is annular. The annular area of the lower surface 83 contacts the protrusion 89. When the first seal member 23 is inserted into the wiring passage 79 from the insertion end opening 80, at least a part of the lower surface 83 of the first seal member 23 contacts the protrusion 89.

[0167] The pressing mechanism 24 applies pressure to the first seal member 23 disposed in the wiring passage 79. The pressing mechanism 24 clamps the first seal member 23 so that the outer surface of the power line 46 and the inner surface of the hole 81 of the first seal member 23 are in close contact. The pressing mechanism 24 presses the first seal member 23 against the protrusion 89 so that the lower surface 83 of the first seal member 23 and the protrusion 89 of the motor case 13 are in close contact.

[0168] The outer surface of the power supply line 46 and the inner surface of the hole 81 of the first seal member 23 are in close contact with each other, so that the boundary between the power supply line 46 and the first seal member 23 is sealed. The lower surface 83 of the first seal member 23 and the protrusion 89 of the motor case 13 are in close contact with each other, so that the boundary between the first seal member 23 and the motor case 13 is sealed. Thereby, the boundary between the power supply line 46 and the motor case 13 is sealed.

[0169] The pressing mechanism 24 has a pressing member 91 and a cover member 92.

[0170] The pressing member 91 has a ring portion 93 disposed around the first seal member 23 and a plurality of claw portions 94 connected to the ring portion 93.

[0171] The ring portion 93 is disposed around the second portion 85 of the first seal member 23. The lower end portion of the ring portion 93 contacts the support surface 88 of the first seal member 23. The central axis of the ring portion 93 and the central axis CX of the first seal member 23 coincide.

[0172] The claw portions 94 are connected to the upper part of the ring portion 93. A plurality of claw portions 94 are arranged around the central axis CX. The claw portion 94 has an elastically deformable portion 94A connected to the ring portion 93 and a head portion 94B connected to the upper part of the elastically deformable portion 94A. The elastically deformable portion 94A elastically deforms so that the head portion 94B moves in the radial direction.

[0173] The cover member 92 is fixed to the motor case 13 in a state of being in contact with the pressing member 91. The cover member 92 has a peripheral wall portion 95 disposed around the claw portions 94 and a fixing portion 96 fixed to the motor case 13.

[0174] The peripheral wall portion 95 has an opening 97 in which the upper end portion of the first portion 84 is disposed. The peripheral wall portion 95 has an inner surface 98 that slopes downward from the opening 97 toward the radially outer side of the central axis CX. The inner surface 98 is disposed so as to surround the central axis CX. The inner surface 98 contacts at least a part of the claw portion 94. The inner surface 98 can contact each of the plurality of claw portions 94 simultaneously. In an embodiment, the inner surface 98 contacts the head portion 94B of the claw portion 94. The head portion 94B has a corner portion 94C that protrudes radially outward of the central axis CX. The inner surface 98 contacts the corner portion 94C.

[0175] The fixing portion 96 is connected to the lower portion of the peripheral wall portion 95. The fixing portions 96 are disposed on the front side and the rear side of the peripheral wall portion 95, respectively. The fixing portion 96 is plate-shaped. The fixing portion 96 has an opening 96A in which a screw 99 is disposed. The fixing portion 96 is fixed to the motor case 13 by the screw 99. As shown in FIGS. 5, 6, and 15, a screw hole 100 is provided in at least a part of the outer surface of the motor case 13. In an embodiment, the screw hole 100 is provided in the overhanging portion 60B of the main body portion 60. With the intermediate portion of the screw 99 disposed in the opening 96A of the fixing portion 96, the cover member 92 is fixed to the motor case 13 by coupling the tip end portion of the screw 99 to the screw hole 100. The fixing portion 96 contacts the outer surface of the motor case 13.

[0176] The head portion 94B of the claw portion 94 is movable in the radial direction of the central axis CX due to the elastic deformation of the elastic deformation portion 94A. When the cover member 92 is fixed to the motor case 13 by the screw 99 with the inner surface 98 of the peripheral wall portion 95 and the corner portion 94C of the head portion 94B in contact, the cover member 92 moves downward. That is, by rotating the screw 99, the cover member 92 moves downward so as to approach the motor case 13.

[0177] When the cover member 92 moves downward, the head portion 94B is pushed radially inward of the central axis CX by the peripheral wall portion 95. As the head portion 94B moves radially inward, the first seal member 23 is clamped by the plurality of claw portions 94. Thus, when the cover member 92 moves downward in a state where the claw portion 94 of the press member 91 is in contact with the cover member 92, the claw portion 94 elastically deforms radially inward of the ring portion 93 due to the contact with the cover member 92, and clamps the first seal member 23. When the first seal member 23 is clamped radially inward by the plurality of claw portions 94, the outer surface of the power supply line 46 and the inner surface of the hole 81 are in close contact with each other.

[0178] Also, when the cover member 92 moves downward, the head portion 94B moves in the axial direction parallel to the central axis CX by the peripheral wall portion 95. That is, when the cover member 92 moves downward, the press member 91 moves downward. The ring portion 93 of the press member 91 contacts the support surface 88 of the first seal member 23. Therefore, when the press member 91 including the ring portion 93 moves downward, the first seal member 23 also moves downward, and the first seal member 23 is pressed against the protrusion portion 89. Thus, when the cover member 92 moves downward in a state where the claw portion 94 of the press member 91 is in contact with the cover member 92, the ring portion 93 moves in the axial direction (downward) of the ring portion 93 due to the contact between the claw portion 94 and the cover member 92, and presses the lower surface 83 of the first seal member 23 against the protrusion portion 89. When the lower surface 83 of the first seal member 23 is pressed against the protrusion portion 89, the lower surface 83 and the protrusion portion 89 are in close contact with each other.

[0179] (Second seal member) The second seal member 25 seals the boundary between the rotor shaft 29 and the motor case 13. The second seal member 25 is disposed in the shaft hole 72. As shown in FIG. 7, the second seal member 25 includes a second seal member 25L that seals the boundary between the left portion of the rotor shaft 29 and the motor case 13, and a second seal member 25R that seals the boundary between the right portion of the rotor shaft 29 and the motor case 13. The second seal member 25L is disposed in the shaft hole 72L. The second seal member 25R is disposed in the shaft hole 72R.

[0180] The peripheral wall portion 101 is disposed around the second seal member 25. The peripheral wall portion 101 supports the second seal member 25. The second seal member 25 is press-fitted between the rotor shaft 29 and the peripheral wall portion 101.

[0181] FIG. 19 is a cross-sectional view showing the vicinity of the second seal member 25L according to the embodiment. As shown in FIGS. 3, 7, and 19, the peripheral wall portion 101L is disposed around the second seal member 25L. The second seal member 25L is disposed to the left of the left bearing 18L. A rib 102L is provided on the inner surface of the peripheral wall portion 101L. The rib 102L protrudes radially inward from the inner surface of the peripheral wall portion 101L. The rib 102L has an annular shape in a plane perpendicular to the rotation axis AX. The rib 102L is disposed between the second seal member 25L and the left bearing 18L. The left surface of the rib 102L supports the second seal member 25L. The right surface of the rib 102L supports the left bearing 18L.

[0182] The second seal member 25L is supported by the peripheral wall portion 101L and the rib 102L. The peripheral wall portion 101L is disposed so as to surround the left portion of the rotor shaft 29. The second seal member 25L is press-fitted between the left portion of the rotor shaft 29 and the peripheral wall portion 101L.

[0183] The second seal member 25L includes an oil seal. The second seal member 25L has a lip portion 103 that contacts the rotor shaft 29, an outer circumferential portion 104 that contacts the peripheral wall portion 101L, and a connecting portion 105 that contacts the rib 102L. The connecting portion 105 is arranged to connect the lip portion 103 and the outer circumferential portion 104. A spring 106 that generates an elastic force to tighten the rotor shaft 29 is arranged inside the lip portion 103. A metal ring 107 that forms the framework of the second seal member 25L is arranged inside the outer circumferential portion 104 and the connecting portion 105.

[0184] A stopper member 108L is disposed on the left side of the second seal member 25L. The stopper member 108L prevents the second seal member 25L from slipping out of the shaft hole 72L. An example of the stopper member 108L is a circlip.

[0185] As shown in Figure 11, the second seal member 25R is disposed to the right of the right bearing 18R. A rib 102R is provided on the inner surface of the peripheral wall portion 101R. The rib 102R is disposed between the second seal member 25R and the right bearing 18R. The right surface of the rib 102R supports the second seal member 25R. The left surface of the rib 102R supports the right bearing 18R.

[0186] The second seal member 25R is supported by the peripheral wall portion 101R and the rib 102R. The peripheral wall portion 101R is disposed so as to surround the right portion of the rotor shaft 29. The second seal member 25R is press-fitted between the right portion of the rotor shaft 29 and the peripheral wall portion 101R.

[0187] Like the second seal member 25L, the second seal member 25R includes an oil seal.

[0188] 4 and 11, a stopper member 108R is disposed on the right side of the second seal member 25R. The stopper member 108R prevents the second seal member 25R from slipping out of the shaft hole 72R. An example of the stopper member 108R is a circlip.

[0189] (Third sealing member) The third seal member 26 seals the boundary between the main body portion 60 and the lid portion 62. The third seal member 26 includes an O-ring. As shown in FIGS. 5 and 6, the third seal member 26 includes an arc portion 26A disposed between the cylindrical portion 60A of the main body portion 60 and the disk portion 62A of the lid portion 62, and a rectangular portion 26B disposed between the overhanging portion 60B of the main body portion 60 and the overhanging portion 62B of the lid portion 62. The rectangular portion 26B is connected to the upper portion of the arc portion 26A. The arc portion 26A contacts each of the peripheral edge of the cylindrical portion 60A and the peripheral edge of the disk portion 62A. The rectangular portion 26B contacts each of the peripheral edge of the overhanging portion 60B and the peripheral edge of the overhanging portion 62B.

[0190] FIG. 20 is a cross-sectional view showing the vicinity of the third seal member 26 according to the embodiment. As shown in FIGS. 7 and 20, the main body portion 60 has a recess 109 provided so as to surround the insertion port 63. An inner peripheral wall portion 110 and an outer peripheral wall portion 111 are provided on the right end surface of the main body portion 60. Each of the inner peripheral wall portion 110 and the outer peripheral wall portion 111 projects rightward from the right end surface of the main body portion 60. The outer peripheral wall portion 111 is disposed radially outside the inner peripheral wall portion 110. The recess 109 is defined by the right end surface of the main body portion 60, the inner peripheral wall portion 110, and the outer peripheral wall portion 111. The third seal member 26 is disposed in the recess 109. The third seal member 26 contacts each of the right end surface of the main body portion 60 and the left end surface of the lid portion 62 in a state of being disposed in the recess 109.

[0191] As shown in FIGS. 6 and 20, the lid portion 62 has a rib portion 112 that fits inside the inner peripheral wall portion 110. The rib portion 112 projects leftward from the left surface of the lid portion 62. The rib portion 112 and the inner peripheral wall portion 110 are in contact.

[0192] <Effect> As described above, in the embodiment, the electric working machine 1 includes a motor 12 which is a brushless motor and a saw chain 10 which is an output unit. The motor 12 has a stator 27, a rotor 28 that rotates with respect to the stator 27, and a rotor shaft 29 fixed to the rotor 28. The saw chain 10 is driven by the rotor shaft 29. The electric working machine 1 includes a motor case 13 having an internal space 59 in which the stator 27 and the rotor 28 are disposed. The electric working machine 1 includes a lead wire disposed in a wiring passage 79 of the motor case 13 that connects the internal space 59 and the external space of the motor case 13. The electric working machine 1 includes a first seal member 23 that seals the boundary between the lead wire and the motor case 13.

[0193] In the above configuration, the boundary between the lead wire disposed in the wiring passage 79 of the motor case 13 and the motor case 13 is sealed by the first seal member 23. By the first seal member 23, the internal space 59 of the motor case 13 becomes a sealed space. At least the stator 27 and the rotor 28 of the motor 12 are disposed in the sealed space. For example, in the case where the electric working machine 1 is designed to be used exclusively outdoors, the electric working machine 1 may get wet in the rain. Since the stator 27 and the rotor 28 are disposed in the sealed space of the motor case 13, it is possible to prevent the stator 27 and the rotor 28 from getting wet in the rain. Also, outdoors, there is a high possibility that foreign matter exists around the electric working machine 1. Since the stator 27 and the rotor 28 are disposed in the sealed space of the motor case 13, it is possible to prevent foreign matter from adhering to the stator 27 and the rotor 28.

[0194] In the embodiment, the stator 27 has a stator core 30, an insulator 31 that covers at least a part of the surface of the stator core 30, and a coil 32 attached to the insulator 31. The lead wire is connected to the coil 32.

[0195] In the above configuration, when the lead wire is a power supply line 46 connected to the coil 32, the boundary between the power supply line 46 and the motor case 13 is sealed by the first seal member 23.

[0196] In the embodiment, the first seal member 23 is inserted into the wire passage 79 .

[0197] In the above configuration, the boundary between the power supply line 46 and the motor case 13 is properly sealed by the first seal member 23 inserted into the wire passage 79.

[0198] In the embodiment, the first seal member 23 has a hole 81 in which the power line 46 is disposed, and a lower surface 83 including a contact portion that contacts a protrusion 89 of the motor case 13 provided in the wire passage 79.

[0199] In the above configuration, the boundary between the power supply line 46 and the first seal member 23 is sealed by the outer surface of the power supply line 46 coming into contact with the inner surface of the hole 81. The boundary between the motor case 13 and the first seal member 23 is sealed by the lower surface 83 of the first seal member 23 coming into contact with the protrusion 89 of the motor case 13. In this way, the boundary between the power supply line 46 and the motor case 13 is sealed by the first seal member 23.

[0200] In the embodiment, the wire passage 79 has an insertion end opening 80 that faces the external space. When the first seal member 23 is inserted into the wire passage 79 from the insertion end opening 80, the lower surface 83 of the first seal member 23 comes into contact with the protrusion 89.

[0201] In the above configuration, when the first seal member 23 is inserted into the wire passage 79 from the insertion end opening 80, the lower surface 83 comes into contact with the protrusion 89, thereby sealing the boundary between the motor case 13 and the first seal member 23.

[0202] In the embodiment, the electric work machine 1 is provided with a press mechanism 24 that tightens the first seal member 23 so that the outer surface of the power line 46 and the inner surface of the hole 81 are in tight contact with each other, and presses the first seal member 23 against the protrusion 89 so that the lower surface 83 including the contact portion is in tight contact with the protrusion 89.

[0203] In the above configuration, by the pressing mechanism 24, the outer surface of the power line 46 and the inner surface of the hole 81 are in close contact, and the boundary between the power line 46 and the first sealing member 23 is sealed. Also, by the pressing mechanism 24, the lower surface 83 of the first sealing member 23 and the protrusion 89 of the motor case 13 are in close contact, and the boundary between the motor case 13 and the first sealing member 23 is sealed. Thereby, the boundary between the power line 46 and the motor case 13 is sealed by the first sealing member 23.

[0204] In the embodiment, the pressing mechanism 24 includes a pressing member 91 having a ring portion 93 disposed around the first sealing member 23 and a plurality of claw portions 94 connected to the ring portion 93, and a cover member 92 fixed to the motor case 13 in a state of being in contact with the pressing member 91.

[0205] In the above configuration, since the cover member 92 is fixed to the motor case 13, the cover member 92 can apply pressure to the first sealing member 23 via the pressing member 91. Thereby, the boundary between the power line 46 and the motor case 13 is sealed by the first sealing member 23.

[0206] In the embodiment, the claw portion 94 is elastically deformed radially inward of the ring portion 93 by contact with the cover member 92 to tighten the first sealing member 23.

[0207] In the above configuration, since the first sealing member 23 is tightened radially inward by the claw portion 94, the outer surface of the power line 46 and the inner surface of the hole 81 are in close contact.

[0208] In the embodiment, the first sealing member 23 has a support surface 88 with which the ring portion 93 contacts. The ring portion 93 moves in the axial direction of the ring portion 93 by contact between the claw portion 94 and the cover member 92, and presses the first sealing member 23 against the protrusion 89.

[0209] In the above configuration, since the first sealing member 23 is moved in the axial direction by the ring portion 93 and pressed against the protrusion 89, the lower surface 83 including the contact portion of the first sealing member 23 and the protrusion 89 of the motor case 13 are in close contact.

[0210] In an embodiment, the cover member 92 has a peripheral wall portion 95 disposed around the claw portion 94 and a fixing portion 96 fixed to the motor case 13.

[0211] In the above configuration, since the fixing portion 96 is fixed to the motor case 13, the first seal member 23 is tightened radially inward and the first seal member 23 is pressed against the protrusion 89 of the motor case 13.

[0212] In an embodiment, at least a part of the rotor shaft 29 is disposed in a shaft hole 72 that connects the internal space 59 and the external space. The electric working machine 1 includes a second seal member 25 that seals the boundary between the rotor shaft 29 and the motor case 13.

[0213] In the above configuration, the boundary between the rotor shaft 29 disposed in the shaft hole 72 of the motor case 13 and the motor case 13 is sealed by the second seal member 25. The internal space 59 of the motor case 13 becomes a sealed space by the second seal member 25.

[0214] In an embodiment, the motor case 13 is disposed around the second seal member 25 and has a peripheral wall portion 101 that supports the second seal member 25.

[0215] In the above configuration, since the second seal member 25 is supported by the peripheral wall portion 101, the boundary between the rotor shaft 29 and the motor case 13 can be stably sealed.

[0216] In an embodiment, the second seal member 25 is press-fitted between the rotor shaft 29 and the peripheral wall portion 101.

[0217] In the above configuration, since the second seal member 25 is press-fitted between the rotor shaft 29 and the peripheral wall portion 101, the boundary between the rotor shaft 29 and the motor case 13 can be stably sealed.

[0218] In an embodiment, the second seal member 25 includes an oil seal.

[0219] In the above configuration, the boundary between the rotating rotor shaft 29 and the motor case 13 is sealed by an oil seal.

[0220] In an embodiment, the motor case 13 includes a main body portion 60 having an insertion port 63 into which the stator 27 is inserted, and a lid portion 62 disposed so as to close the insertion port 63 and forming an internal space 59 between the main body portion 60. The electric working machine 1 includes a third seal member 26 that seals the boundary between the main body portion 60 and the lid portion 62.

[0221] In the above configuration, the boundary between the main body portion 60 and the lid portion 62 is sealed by the third seal member 26. With the third seal member 26, the internal space 59 of the motor case 13 becomes a sealed space.

[0222] In an embodiment, the main body portion 60 has a recess 109 provided so as to surround the insertion port 63. The third seal member 26 is disposed in the recess 109.

[0223] In the above configuration, the third seal member 26 is positioned by the recess 109.

[0224] In an embodiment, the third seal member 26 includes an O-ring.

[0225] In the above configuration, the boundary between the main body portion 60 and the lid portion 62 is sealed with a simple structure.

[0226] In an embodiment, the electric working machine 1 includes a bearing 18 that supports the rotor shaft 29. The bearing 18 is supported by the motor case 13.

[0227] In the above configuration, a change in the relative position between the bearing 18 and the motor case 13 is suppressed.

[0228] In an embodiment, in the internal space 59 of the motor case 13, the stator 27 is arranged so as to surround at least a part of the rotor 28.

[0229] In the above configuration, the motor 12, which is an inner rotor type brushless motor, is housed in the motor case 13.

[0230] [Second Embodiment] The second embodiment will be described. In the following description, the same reference numerals are given to the components that are the same as or equivalent to those in the above-described embodiment, and the description of those components will be simplified or omitted.

[0231] FIG. 21 is a longitudinal sectional view schematically showing a motor assembly 1101 according to an embodiment. The magnetic sensor 74 is supported by the sensor substrate 22. As shown in FIG. 21, in the radial direction, the magnetic sensor 74 is arranged outside the rotor 28. More specifically, in the radial direction, the magnetic sensor 74 is arranged outside the outer surface of the rotor core 54.

[0232] In the radial direction, the sensor magnet 21 is arranged outside the rotor 28. More specifically, in the radial direction, the sensor magnet 21 is arranged outside the outer surface of the rotor core 54. The sensor magnet 21 is arranged so as to face the magnetic sensor 74.

[0233] In the example shown in FIG. 21, the sensor magnet 21 is directly fixed to the cooling fan 20. Note that the sensor magnet 21 may be fixed to a rotating member different from the cooling fan 20 and the fan bush 73.

[0234] As described above, in the embodiment, in the radial direction of the rotation axis AX of the rotor 28, the magnetic sensor 74 is arranged outside the rotor 28.

[0235] In the above configuration, since the magnetic sensor 74 is arranged at a position away from the rotation axis AX, the detection accuracy of the rotation of the rotor 28 by the magnetic sensor 74 is improved.

[0236] [Embodiment 3] Embodiment 3 will be described. In the following description, components that are the same as or equivalent to those in the above-described embodiments are denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0237] FIG. 22 is a longitudinal sectional view showing a motor assembly 1102 according to an embodiment. FIG. 23 is a perspective view showing a first seal member 230 and a press mechanism 24 according to an embodiment.

[0238] In the above-described embodiment, the sensor substrate 22 is arranged outside the motor case 13. As shown in FIG. 22, the sensor substrate 22 may be arranged in the internal space 59 of the motor case 13. In the example shown in FIG. 22, the sensor substrate 22 is arranged around the sleeve 113. The sleeve 113 is arranged around the rotor shaft 29. The sensor substrate 22 is fixed to the lid portion 62 by screws 114.

[0239] Similar to the above-described embodiment, the sensor substrate 22 has a magnetic sensor 74. The magnetic sensor 74 is arranged in the internal space of the motor case 13. In the embodiment, the magnetic sensor 74 detects the rotating magnet 55. The rotating magnet 55 is rotated by the rotor 28. The magnetic sensor 74 detects the rotation of the rotor 28 by detecting the rotating magnet 55. In the embodiment, the rotating magnet 55 functions as a sensor magnet. Note that a sensor magnet different from the rotating magnet 55 may be fixed to the rotor 28. The magnetic sensor 74 may detect the rotation of the rotor 28 by detecting a sensor magnet rotated by the rotor 28.

[0240] As shown in FIG. 23, the first seal member 230 has a hole 81 in which the power line 46 is arranged and a hole 810 in which the signal line 75 is arranged. The signal line 75 is a lead wire connected to the magnetic sensor 74 via the sensor substrate 22.

[0241] FIG. 24 is a diagram showing a signal line 75 supported by the first seal member 230 according to the embodiment. As shown in FIG. 24, the five signal lines 75 are integrated by a tube 115. The tube 115 is disposed in the hole 810. As the tube 115, a heat shrinkable tube is exemplified. The outer surface of the tube 115 and the inner surface of the hole 810 are in close contact with each other.

[0242] As described above, in the embodiment, the first seal member 230 may seal the boundary between the signal line 75, which is a lead wire connected to the magnetic sensor 74, and the motor case 13.

[0243] [Fourth Embodiment] The fourth 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 those components is simplified or omitted.

[0244] FIG. 25 is a perspective view showing the first seal member 233 and the pressing mechanism 24 according to the embodiment. FIG. 26 is an exploded perspective view showing the first seal member 233 and the pressing mechanism 24 according to the embodiment. FIG. 27 is a longitudinal sectional view showing the motor assembly 1103 according to the embodiment.

[0245] Similar to the above-described third embodiment, in the motor assembly 1103, the sensor substrate 22 having the magnetic sensor 74 is disposed in the internal space of the motor case 13.

[0246] The motor case 13 has a wiring passage 79 that connects the internal space of the motor case 13 and the external space of the motor case 13.

[0247] The motor assembly 1103 has, as lead wires, three power supply lines 46 and five signal lines 75. Similar to the above-described embodiment, the power supply lines 46 are connected to the coil 32. The signal lines 75 are connected to the magnetic sensor 74 of the sensor substrate 22 disposed in the internal space of the motor case 13. As described with reference to FIG. 24, the five signal lines 75 are integrated by a tube 115.

[0248] The three power lines 46 and the single tube 115 are integrated by an integrated tube 116 (sheath). The integrated tube 116 is an electrical insulating member. Rubber is exemplified as the material forming the integrated tube 116. The integrated tube 116 is substantially cylindrical. A cab tire cord is formed by the three power lines 46, the single tube 115, and the integrated tube 116.

[0249] The integrated tube 116 has a hole 811 in which the power line 46 is disposed and a hole 812 in which the tube 115 is disposed. Each of the hole 811 and the hole 812 is formed so as to penetrate the upper surface and the lower surface of the integrated tube 116. Three holes 811 are provided. The three holes 811 are provided parallel to each other. One hole 812 is provided. The hole 811 and the hole 812 are provided parallel to each other. The outer surface of the power line 46 is in close contact with the inner surface of the hole 811. The outer surface of the tube 115 is in close contact with the inner surface of the hole 812.

[0250] Note that the inner diameter of the hole 811 and the inner diameter of the hole 812 may be the same or different.

[0251] The first seal member 233 is cylindrical. The first seal member 233 is made of rubber. The first seal member 233 is disposed around the integrated tube 116. The integrated tube 116 is disposed inside the first seal member 233.

[0252] Each of the first seal member 233 and the integrated tube 116 is disposed in the wiring passage 79. The first seal member 233 seals the boundary between the integrated tube 116 and the motor case 13. Similar to the first seal member 23 described in the above embodiment, the first seal member 233 has a first portion 84, a second portion 85 disposed below the first portion 84, and a third portion 86 disposed below the second portion 85. The diameter of the second portion 85 is larger than the diameter of the first portion 84. The diameter of the third portion 86 is larger than the diameter of the second portion 85. A step is provided at the boundary between the first portion 84 and the second portion 85. A step is provided at the boundary between the second portion 85 and the third portion 86.

[0253] The structure of the pressing mechanism 24 is the same as that of the pressing mechanism 24 described in the above-described embodiment. Similar to the above-described embodiment, the pressing mechanism 24 has a pressing member 91 and a cover member 92. The cover member 92 is fixed to the motor case 13 by a screw 99.

[0254] The pressing mechanism 24 applies pressure to each of the first seal member 233 and the collective tube 116 disposed in the wiring passage 79. The pressing mechanism 24 tightens the first seal member 233 so that the outer surface of the power line 46 and the inner surface of the hole 811 of the collective tube 116 are in close contact. Further, the pressing mechanism 24 tightens the first seal member 233 so that the outer surface of the tube 115 and the inner surface of the hole 812 of the collective tube 116 are in close contact. Further, the first seal member 233 has a lower surface which is a contact portion that contacts a protrusion 89 (see FIG. 17 etc.) of the motor case 13 provided in the wiring passage 79. The pressing mechanism 24 presses the first seal member 233 against the protrusion 89 so that the lower surface of the first seal member 233 and the protrusion 89 of the motor case 13 are in close contact.

[0255] Since the outer surface of the power line 46 and the inner surface of the hole 811 of the collective tube 116 are in close contact, the boundary between the power line 46 and the collective tube 116 is sealed. Since the outer surface of the tube 115 and the inner surface of the hole 812 of the collective tube 116 are in close contact, the boundary between the signal line 75 and the collective tube 116 is sealed. Since the first seal member 233 and the cylindrical portion 60D are in close contact, the boundary between the first seal member 233 and the motor case 13 is sealed. Thereby, the boundary between the power line 46 and the motor case 13 is sealed by the collective tube 116 and the first seal member 233, and the boundary between the signal line 75 and the motor case 13 is sealed by the collective tube 116 and the first seal member 233.

[0256] [Fifth Embodiment] The fifth embodiment will be described. In the following description, the same reference numerals are given to the same or equivalent components as those in the above-described embodiment, and the description of those components is simplified or omitted.

[0257] Fig. 28 is a perspective view showing the first seal member 234 and the press mechanism 24 according to the embodiment. Fig. 29 is an exploded perspective view showing the first seal member 234 and the press mechanism 24 according to the embodiment. Fig. 30 is a vertical cross-sectional view showing the motor assembly 1104 according to the embodiment.

[0258] As in the third embodiment described above, in the motor assembly 1104, the sensor board 22 having the magnetic sensor 74 is disposed in the internal space of the motor case 13.

[0259] The motor case 13 has a wire passage 79 that connects the internal space of the motor case 13 with the external space of the motor case 13 .

[0260] The motor assembly 1104 has three power supply wires 46, five signal wires 75, and two signal wires 754 as lead wires. As in the above-described embodiment, the power supply wires 46 are connected to the coil 32. The signal wires 75 are connected to the magnetic sensor 74 of the sensor board 22 disposed in the interior space of the motor case 13. As described with reference to FIG. 24 , the five signal wires 75 are integrated by the tube 115. The signal wire 754 is connected to the temperature sensor 744 disposed in the interior space of the motor case 13.

[0261] The temperature sensor 744 detects the temperature of at least a part of the motor 12. The temperature sensor 744 detects the temperature of at least a part of the stator 27, for example. The temperature sensor 744 may detect the temperature of the coil 32. The temperature sensor 744 may be disposed on the inner circumferential side of the coil 32. The temperature sensor 744 may be disposed between the coil 32 and the tooth covering portion 36, for example. The temperature sensor 744 may be disposed at the right end of the tooth covering portion 36, for example.

[0262] The first seal member 234 is substantially cylindrical. The first seal member 234 is made of rubber. The first seal member 234 has a hole 81 through which the power line 46 is disposed, a hole 810 through which the tube 115 containing the signal line 75 is disposed, and a hole 814 through which the signal line 754 is disposed.

[0263] The inner diameters of holes 81, 810, and 814 may be the same or different.

[0264] Hole 81, hole 810, and hole 814 are each formed to penetrate the upper and lower surfaces of first seal member 234. Three holes 81 are provided. The three holes 81 are provided parallel to one another. One hole 810 is provided. One hole 814 is provided. Holes 81, 810, and 814 are provided parallel to one another. The outer surface of power line 46 and the inner surface of hole 81 are in close contact. The outer surface of tube 115 and the inner surface of hole 810 are in close contact. The outer surface of signal line 754 and the inner surface of hole 814 are in close contact.

[0265] The power line 46, the tube 115 including the signal line 75, and the signal line 754 are each arranged in the wire passage 79 while being held by the first seal member 234. The first seal member 234 seals the boundary between the power line 46 and the motor case 13. The first seal member 234 seals the boundary between the tube 115 and the motor case 13. The first seal member 234 seals the boundary between the signal line 754 and the motor case 13.

[0266] Similar to the first seal member 23 described in the above embodiment, the first seal member 234 has a first portion 84, a second portion 85 disposed below the first portion 84, and a third portion 86 disposed below the second portion 85. The diameter of the second portion 85 is larger than the diameter of the first portion 84. The diameter of the third portion 86 is larger than the diameter of the second portion 85. A step is provided at the boundary between the first portion 84 and the second portion 85. A step is provided at the boundary between the second portion 85 and the third portion 86.

[0267] The structure of the press mechanism 24 is similar to that of the press mechanism 24 described in the above embodiment. As in the above embodiment, the press mechanism 24 has a press member 91 and a cover member 92. A fixing portion 96 of the cover member 92 is fixed to the motor case 13 with a screw 99.

[0268] The press mechanism 24 applies pressure to the first seal member 234 arranged in the wire passage 79. The press mechanism 24 tightens the first seal member 234 so that the outer surface of the power line 46 and the inner surface of the hole 81 come into close contact with each other. The press mechanism 24 also tightens the first seal member 234 so that the outer surface of the tube 115 and the inner surface of the hole 810 come into close contact with each other. The press mechanism 24 also tightens the first seal member 234 so that the outer surface of the signal line 754 and the inner surface of the hole 814 come into close contact with each other. The first seal member 234 has a lower surface that serves as a contact portion that comes into contact with a protrusion 89 (see FIG. 17, etc.) of the motor case 13 provided in the wire passage 79. The press mechanism 24 presses the first seal member 234 against the protrusion 89 of the motor case 13 so that the lower surface of the first seal member 234 and the protrusion 89 come into close contact with each other.

[0269] The boundary between the power line 46 and the motor case 13 is sealed by the outer surface of the power line 46 coming into close contact with the inner surface of the hole 81. The boundary between the signal line 75 and the motor case 13 is sealed by the outer surface of the tube 115 coming into close contact with the inner surface of the hole 810. The boundary between the signal line 754 and the motor case 13 is sealed by the outer surface of the signal line 754 coming into close contact with the inner surface of the hole 814.

[0270] [Other embodiments] In the above-described embodiment, the motor 12 is an inner rotor brushless motor. However, the motor 12 may be an outer rotor brushless motor. In an outer rotor brushless motor, the teeth protrude radially outward from the annular yoke.

[0271] In the above-described embodiment, the electric work machine 1 is a chainsaw, which is a type of gardening tool. The gardening tool is not limited to a chainsaw. Examples of gardening tools include a hedge trimmer, a lawn mower, a brush cutter, and a blower. The electric work machine 1 may also be a power tool. Examples of power tools include a driver drill, a percussion driver drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a circular saw, and a reciprocating saw.

[0272] In the above-described embodiment, the battery pack 17 attached to the battery mounting portion is used as the power source of the electric working machine. As the power source of the electric working machine, a commercial power source (AC power source) may be used.

Description of Signs

[0273] 1...electric work machine, 2...housing, 3...front grip section, 4...hand guard, 5...battery mounting section, 6...controller, 7...trigger lock lever, 8...trigger switch, 9...guide bar, 10...saw chain (output section), 11...motor assembly, 12...motor, 13...motor case, 14...motor housing section, 15...battery holding section, 16...rear grip section, 17...battery pack, 18...bearing, 18L...left bearing, 18R...right bearing, 19...heat transfer resin section, 20...cooling fan, 20A...intake port, 20B...first plate, 20C...opening, 20D...second plate, 20E...blade, 20F...air outlet, 21...sensor magnet, 22...sensor board, 22A...notch, 22B...hole, 23...first seal member, 24...press mechanism, 25...second seal member, 25L...second seal member, 25R...second seal member, 26...third seal member, 26A...circular portion, 26B...rectangular portion, 27...stator, 28...rotor, 29...rotor shaft, 30...stator core, 31...insulator, 32...coil, 33...busbar unit, 34...yoke, 35...teeth, 36...teeth covering portion, 37...coil stopper portion, 38...circumferential wall portion, 38L...peripheral wall portion, 38R...peripheral wall portion, 39...wire support portion, 39A...inner protrusion portion, 39B...outer protrusion portion, 40...screw boss portion, 41...wire, 42...external terminal, 42U...external terminal, 42V...external terminal, 42W...external terminal, 43...fusing terminal, 43U...fusing terminal, 43V...fusing terminal, 43W...fusing terminal, 44...short-circuit member, 44U...short-circuit member, 44V...short-circuit member, 44W...short-circuit member, 45...insulating member, 46...power line, 46U...power line, 46V...power line, 46W...power line, 47...connecting terminal, 47U...connecting terminal, 47V...connecting terminal , 47W...connection terminal, 48...base portion, 49...screw boss portion, 50...connection portion, 51...recess, 52...screw, 53...screw, 54...rotor core, 55...rotation magnet, 56...magnet hole, 57...hollow hole, 58...cylindrical member, 59...internal space, 59A...circular space, 59B...projecting space, 60...main body portion, 60A...cylindrical portion, 60B...projecting portion, 60C...wall portion, 60D...cylindrical portion, 61...heat dissipation fin, 62...lid portion, 62A...disk portion, 62B...projecting portion, 62D...screw boss portion, 62E...positioning pin, 63...insertion port, 64...support surface, 65...screw hole, 66...washer, 67...screw, 68...projecting portion,69...Screw boss portion, 70...Screw boss portion, 71...Screw, 72...Shaft hole, 72L...Shaft hole, 72R...Shaft hole, 73...Fan bushing, 73A...Disk portion, 73B...Cylindrical portion, 73C...Support hole, 73D...Magnet hole, 74...Magnetic sensor, 75...Signal line, 76...Resin film, 77...Electronic component, 78...Screw, 79...Wiring passage, 80...Insertion end opening, 81...Hole, 82... Upper surface, 83...lower surface (contact portion), 84...first portion, 85...second portion, 86...third portion, 87...tapered surface, 88...support surface, 89...projection portion, 91...press member, 92...cover member, 93...ring portion, 94...claw portion, 94A...elastic deformation portion, 94B...head portion, 94C...corner portion, 95...peripheral wall portion, 96...fixing portion, 96A...opening, 97...opening, 98...inner surface, 99...screw, 100... Screw hole, 101... peripheral wall portion, 101L... peripheral wall portion, 101R... peripheral wall portion, 102L... rib, 102R... rib, 103... lip portion, 104... outer periphery portion, 105... connecting portion, 106... spring, 107... metal ring, 108L... stopper member, 108R... stopper member, 109... recess, 110... inner peripheral wall portion, 111... outer peripheral wall portion, 112... rib portion, 113... sleeve, 11 4...Screw, 115...Tube, 116...Collecting tube, 230...First sealing member, 233...First sealing member, 234...First sealing member, 744...Temperature sensor, 754...Signal line, 810...Hole, 811...Hole, 812...Hole, 814...Hole, 1101...Motor assembly, 1102...Motor assembly, 1103...Motor assembly, 1104...Motor assembly.

Claims

1. A brushless motor having a stator, a rotor that rotates with respect to the stator, and a rotor shaft fixed to the rotor; An output section driven by the rotor shaft; A motor case having an internal space in which the stator and the rotor are disposed; A lead wire disposed in a wiring passage of the motor case that connects the internal space and an external space of the motor case; A columnar first seal member that seals a boundary between the lead wire and the motor case; The first seal member has a hole in which the lead wire is disposed; The outer surface of the lead wire and the inner surface of the hole are in close contact; The motor case has an annular protrusion provided on an inner surface of the wiring passage and protruding toward a center of the wiring passage and toward the external space; The first seal member has a contact portion that contacts the protrusion; An electric working machine.

2. The stator has a stator core, an insulator that covers at least a part of a surface of the stator core, and a coil attached to the insulator; The lead wire is connected to the coil; The electric working machine according to claim 1.

3. A sensor magnet disposed in the internal space and rotated by the rotor; A magnetic sensor disposed in the internal space and detecting the sensor magnet; The lead wire is connected to the magnetic sensor; The electric working machine according to claim 1.

4. The first seal member is inserted into the wiring passage; The electric working machine according to any one of claims 1 to 3.

5. The wiring passage has an insertion end opening facing the external space; When the first seal member is inserted into the wiring passage from the insertion end opening, the contact portion and the protrusion come into contact with each other; The electric working machine according to claim 1.

6. A press mechanism is provided that tightens the first seal member so that the outer surface of the lead wire and the inner surface of the hole are in close contact, and presses the first seal member against the protrusion so that the contact portion and the protrusion are in close contact; The electric working machine according to claim 1.

7. The press mechanism has a press member having a ring portion disposed around the first seal member and a plurality of claw portions connected to the ring portion, and a cover member fixed to the motor case in a state of contacting the press member; The electric working machine according to claim 6.

8. The claw portion elastically deforms radially inward of the ring portion by contact with the cover member to clamp the first seal member. The electric working machine according to claim 7.

9. The first seal member has a support surface with which the ring portion contacts. The ring portion moves in the axial direction of the ring portion by contact between the claw portion and the cover member, and presses the first seal member against the protrusion. The electric working machine according to claim 7.

10. The cover member has a peripheral wall portion disposed around the claw portion and a fixing portion fixed to the motor case. The electric working machine according to any one of claims 7 to 9.

11. At least a part of the rotor shaft is disposed in a shaft hole connecting the internal space and the external space, and includes a second seal member that seals the boundary between the rotor shaft and the motor case. The electric working machine according to any one of claims 1 to 10.

12. The motor case is disposed around the second seal member and has a peripheral wall portion that supports the second seal member. The electric working machine according to claim 11.

13. The second seal member is press-fitted between the rotor shaft and the peripheral wall portion. The electric working machine according to claim 12.

14. The second seal member includes an oil seal. The electric working machine according to claim 12 or claim 13.

15. The motor case includes a main body portion having an insertion port into which the stator is inserted, and a lid portion disposed so as to close the insertion port and forming the internal space between the main body portion. and includes a third seal member that seals the boundary between the main body portion and the lid portion. The electric working machine according to any one of claims 1 to 14.

16. The main body portion has a recess provided so as to surround the insertion port. The third seal member is disposed in the recess. The electric working machine according to claim 15.

17. The third seal member includes an O-ring. The electric working machine according to claim 15 or claim 16.

18. Comprises a bearing for supporting the rotor shaft, and the bearing is supported by the motor case. The electric working machine according to any one of claims 1 to 17.

19. In the internal space of the motor case, the stator is disposed so as to surround at least a part of the rotor. The electric power working machine according to any one of claims 1 to 18.

Images