JP2016155218A - Process machine and electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process machine comprising an outer rotor type electric motor having a stator arranged on the inner peripheral side of a rotor as a driving source so as to enhance the maintainability by improving the disassembly of the electric motor, which solves the problem in the prior art that, in the position of a motor axial line J direction, a stator is clamped between a motor housing and a gear housing and is fixed to a fixed stator base, and the rotor is supported on the opposite output side, therefore, when the motor housing is removed, the stator is taken out together by magnetic force of the rotor, and troublesome work is required for separating the rotor and the stator.SOLUTION: A rotor base 60 for supporting a rotor 53 is supported on a closer part to an output side of a motor axis 54 than a stator 52, and the stator 52 is fixed to a stator support part 55 disposed in a motor housing 51. As a result, the motor housing 51 and the stator 52 can be integrally removed, so that the stator 52 can be easily separated from the rotor 53 against magnetic force.SELECTED DRAWING: Figure 6

Description

  TECHNICAL FIELD The present invention relates to a processing machine such as a portable maroon saw, a desktop maroon saw or a grooving cutter, and an electric motor that can be suitably used for this processing machine.

  In addition to the inner rotor type electric motor in which the rotor (rotor) is disposed on the inner peripheral side of the stator (stator), the electric motor that is the drive source of this type of processing machine rotates on the outer peripheral side of the stator. An outer rotor type electric motor in which a child is arranged is used. In the latter outer rotor type electric motor, the surface area of the rotor (outer rotor) is larger than that in the former inner rotor type electric motor, so that the magnetic force can be set large, thereby outputting a high torque. be able to. For this reason, in the case of the outer rotor type, if the output torque is set to be equal, it is possible to reduce the size compared to the inner rotor type, and conversely, when setting the same size without reducing the size. Can output higher torque than the inner rotor type.

  The following patent document discloses a technique related to a processing machine using an outer rotor type electric motor as a drive source. In a conventional outer rotor type electric motor, an inner peripheral stator is fixed to a fixed cover side (motor axial direction output side with respect to the rotor) via a stator base. A rotor and a cooling fan are supported on the motor shaft on the opposite side of the stator. A drive gear of a reduction gear train is attached to the output portion of the motor shaft. The rotational power of the electric motor is transmitted to the spindle through meshing of the drive gear and the driven gear, whereby the rotary blade rotates. The motor housing is coupled to a gear housing that houses the reduction gear train. The gear housing is integrally provided on the back side of the fixed cover.

JP 2012-176468 A

  In the conventional outer rotor type electric motor, there has been a point to be improved mainly in terms of disassembly and assembling. In a conventional outer rotor type electric motor, a stator is arranged on the saw blade side with respect to the rotor via a stator base, and the stator base and the motor housing are screwed together and coupled to the gear housing. Met. That is, since the stator base is not directly fixed to the gear housing, if the motor housing is removed when the electric motor is disassembled, the stator base is also removed together, and as a result, the stator is attracted to the rotor magnet. In the integrated state, the motor housing and the stator base are separated and removed together. Since the magnetic force of the magnet of the rotor is large, in a state where the stator and the rotor that are not coupled to the motor housing are attracted to each other, it is extremely difficult to separate the two against the magnetic force.

  The present invention has been made in order to solve the conventional problems in the outer rotor type electric motor, and mainly disassembles the electric motor so that the stator and the rotor can be easily separated when the electric motor is disassembled. The purpose is to improve the maintainability.

  The above problems are solved by the following invention. 1st invention is a processing machine provided with the rotary blade and the electric motor as a drive source which rotates a blade. In the first invention, the motor housing of the electric motor is coupled to the fixed cover side that covers the rotary blade. In the first invention, the electric motor is an outer rotor type electric motor having a stator on the inner peripheral side of the rotor. In the first aspect of the invention, the rotor is attached to the rotor base supported on the motor shaft on the output side with respect to the stator at the position in the motor axis direction and is supported on the fixed cover side, while the stator is on the motor housing side. It is fixed so as not to move in the motor axis direction, and is arranged on the inner peripheral side of the rotor.

  According to the first invention, the stator is fixed to the motor housing side, while the rotor is supported by the motor shaft on the output side of the stator. For this reason, when separating the motor housing from the fixed cover side, the rotor is maintained in a state assembled to the fixed cover side via the motor shaft, while the stator is removed integrally with the motor housing. Separated from. Thus, according to the first invention, when disassembling the electric motor, the stator can be separated from the rotor at the same time when the motor housing is separated from the fixed cover side. The resolvability of the motor can be improved, and as a result, the maintainability can be improved.

  In addition, when the motor housing is separated from the fixed cover, the stator and the rotor are separated from the fixed cover side integrally with the motor housing in a state where the stator and the rotor are attracted to each other by the magnetic force of the magnet (magnetic force adsorption state). However, since the stator is fixed so as not to move in the motor axis direction with respect to the motor housing, the rotor can be separated from the stator by grasping the motor housing. Also, when the motor housing is separated from the fixed cover, the motor housing can be gripped and the stator can be easily separated from the rotor against the magnetic force, and then the rotor can be easily separated from the fixed cover side by itself. Can be removed. By gripping the motor housing that is larger than the stator, a greater force can be applied, thereby allowing the stator to be more easily separated from the rotor against the magnetic force.

  On the other hand, when the motor housing is separated from the fixed cover in the conventional configuration in which the stator is not fixed to the motor housing in the motor axial direction, the motor housing is separated while leaving the stator and the rotor on the fixed cover side. As a result, the stator and the rotor are removed from the fixed cover side in a state where the stator and the rotor are adsorbed to each other. In this case, it is extremely difficult to separate the removed rotor and stator against the magnetic force. Become. Since the stator and the rotor alone are smaller articles than the motor housing and the cover, it is necessary to apply an extremely large force to directly grip the stator and the rotor alone to separate them. In this respect, separation work becomes extremely difficult.

  According to the first invention, since at least the stator can be integrated with the motor housing and separated from the fixed cover side, even if the rotor is separated together from the fixed cover side at this time, The stator can be easily separated from the rotor by grasping the motor housing, and in this respect, the workability (disassembly) and the maintenance performance when the electric motor is disassembled (separator and rotor are separated) are improved. be able to.

  A second invention is the processing machine according to the first invention, wherein a stator support portion is projected in the motor axial direction inside the motor housing, and the stator is fixed near the tip of the stator support portion.

  According to the second invention, since the stator is fixed near the tip of the stator support portion, the fixing mechanism can be arranged inside the motor housing. The stator will not be disassembled first.

  A third invention is the processing machine according to the first or second invention, wherein a stator fixing member is attached to the stator support portion and the stator is fixed to the stator support portion.

  According to the third invention, the stator support member is attached to the stator support portion, and the stator is fixed to the stator support portion so as not to be axially movable. To fix the stator non-rotatably around the motor axis with respect to the stator support part, for example, realized by adopting a configuration in which the two-sided width part provided on the stator support part is inserted on the inner peripheral side of the stator it can.

  A fourth aspect of the invention is the processing machine according to any one of the first to third aspects of the invention, wherein the bearing on the opposite side of the two bearings that rotatably support the motor shaft is held by the stator support portion or the stator fixing member. It is.

  According to the fourth aspect of the invention, the stator support portion or the stator fixing member can function as the output support portion by holding the bearing on the stator support portion or the stator fixing member.

  A fifth invention is a processing machine according to any one of the first to fourth inventions, wherein the rotor base is provided with a plurality of blades so that the rotor base functions as a cooling fan.

  According to the fifth aspect, the electric motor can be made compact in the motor axis direction.

  According to a sixth invention, in any one of the first to fifth inventions, the stator is disposed on the inner peripheral side of the rotor by coupling the motor housing to a fixed cover in which the rotor has been assembled in advance. This is a processing machine having a configuration.

  According to the sixth aspect of the invention, when the motor housing is separated from the fixed cover, the stator is separated from the rotor at the same time, so that the electric motor can be quickly and easily disassembled (separator and rotor separated). It can be carried out.

  7th invention is a processing machine provided with the rotating cutter, the electric motor as a drive source which rotates a cutter, the motor housing which accommodates an electric motor, and the fixed cover which covers a cutter. In the seventh invention, the electric motor is an outer rotor type electric motor having a stator on the inner peripheral side of the rotor. In the seventh invention, the stator is fixed to one of the motor housing and the fixed cover so as not to move in the motor axial direction, and the motor housing is removed from the fixed cover in a state where the stator and the rotor are attracted to each other by magnetic force. This is a processing machine having a separable configuration.

  According to the seventh aspect of the invention, the stator is fixed to one of the motor housing and the fixed cover so as not to move on the motor axis. According to the seventh invention, when the stator is fixed to the motor housing side, the stator and the rotor are integrally removed while being attracted to each other by magnetic force at the stage of separating the motor housing from the fixed cover. be able to. The removed stator and rotor can be easily separated against the magnetic force by gripping the motor housing. On the other hand, when the stator is fixed to the fixed cover side, the stator and the rotor are left on the fixed cover side in a state where they are attracted to each other by magnetic force when the motor housing is separated from the fixed cover. The remaining stator and rotor can be easily separated against the magnetic force by gripping the fixed cover.

  The eighth invention is an electric motor used in any one of the first to seventh inventions. An eighth invention is an outer rotor type electric motor having a stator on the inner peripheral side of the rotor, the rotor supported by the motor shaft on the output side of the stator with respect to the position in the motor axial direction. It is an electric motor attached to the base and having a stator fixed inside the motor housing.

  According to the eighth aspect of the invention, it is possible to improve the maintainability by improving the decomposability of the electric motor.

1 is an overall perspective view of a processing machine including an electric motor according to an embodiment of the present invention as a drive source. It is the side view which looked at the processing machine from the arrow (II) direction in FIG. It is the top view which looked at the processing machine from the arrow (III) direction in FIG. In this figure, the electric motor is shown in cross section. It is the front view which looked at the processing machine from the arrow (IV) direction in FIG. It is the (V)-(V) sectional view taken on the line of FIG. 2, Comprising: It is a longitudinal cross-sectional view of a processing machine. It is a longitudinal cross-sectional view of the electric motor which concerns on 1st Embodiment. It is a longitudinal cross-sectional view of the electric motor which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view of the electric motor which concerns on 3rd Embodiment.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1-5 has shown the processing machine 1 of this embodiment. This processing machine 1 is a so-called portable maroon saw, and includes a flat plate-like base 2 that is brought into contact with the upper surface of the cutting material W, and a tool body 10 supported on the upper portion of the base 2.

  The tool body 10 includes an electric motor 50 as a drive source, a reduction gear train 20 for reducing the rotational output of the electric motor 50, and a circular rotary blade 12 attached to a spindle 25 that is an output shaft of the reduction gear train 20. It has. The lower side of the rotary blade 12 is protruded from the lower surface of the base 2, and the protruding portion is cut into the cutting material W to be cut. The upper half of the rotary blade 12 is covered with a fixed cover 14 in an approximately half-circumferential range (above the base 2). The lower peripheral edge of the rotary blade 12 protruding to the lower surface side of the base 2 is covered with a movable cover 16.

  In each figure, the direction indicated by the white arrow is the direction in which cutting proceeds, and the rotary blade 12 is cut into the cutting material by moving the processing machine 1 in the direction of the white arrow. In the following description, in the front-rear direction of the member or configuration, the direction in which cutting proceeds (the direction of the white arrow) is the front side or front part, and the opposite side is the rear side or rear part. A user is located behind the processing machine 1 and moves the processing machine 1. Accordingly, the left and right directions of the members and structures are used on the basis of the user. The motor shaft 54 serving as the output shaft of the electric motor 50 extends in a direction (left-right direction) intersecting (orthogonal) with respect to the direction in which cutting proceeds.

  A gear housing 21 that houses a reduction gear train 20 is provided on the back side (left side) of the fixed cover 14. A motor housing 51 of the electric motor 50 is coupled to the gear housing 21. As shown in FIG. 3, the electric motor 50 is a brushless motor, which is a so-called outer rotor type electric motor. In the present embodiment, the electric motor 50 is provided with a novel feature that has not existed in the past. Details of the electric motor 50 will be described later.

  The front end side of the motor shaft 54 of the electric motor 50 protrudes from the motor housing 51 and enters the reduction gear train 20. The reduction gear train 20 constitutes a one-stage reduction mechanism that is engaged with the drive gear 22 and the driven gear 23. The drive gear 22 is attached to the motor shaft 54 of the electric motor 50. A driven gear 23 that meshes with the drive gear 22 is attached to a spindle 25. The front end side of the spindle 25 protrudes into the fixed cover 14, and the rotary blade 12 is attached to the protruding portion in a state of being sandwiched between the receiving flange 26 and the presser flange 27. The spindle 25 is rotatably supported by the gear housing 21 via bearings 28 and 29. The rotary blade 12 rotates counterclockwise as viewed from the front. As shown in FIG. 1, on the front side of the fixed cover 14, the rotation direction of the rotary blade 12 is indicated by an arrow 14a.

  The tool body 10 is supported on the upper portion of the base 2 via a front swing support shaft 15 so as to be swingable up and down. By changing the vertical swing position of the tool body 10 with respect to the base 2, the projecting dimension of the rotary blade 12 to the lower surface side of the base 2 can be changed. The depth can be adjusted. An operation lever 5 is provided on the rear side of the tool body 10. When the operation lever 5 is operated in the loosening direction when changing the vertical swing position of the tool body 10, the tool body 10 can be swung up and down with respect to the base 2, whereby the cutting depth of the rotary blade 12 is increased. Can be changed. When the operation lever 5 is swung in the tightening direction, the vertical swing position of the tool body 10 is fixed, and the cutting depth of the rotary blade 12 is fixed.

  The lower half of the rotary blade 12 protruding to the lower surface side of the base 2 is covered by the movable cover 16. The movable cover 16 is supported by the fixed cover 14 so as to be rotatable around the rotary blade 12. The movable cover 16 is spring-biased in the closing direction (counterclockwise direction in FIG. 2). As shown in FIG. 2, the tip of the movable cover 16 is brought into contact with the edge of the cutting material W, and in this contacted state, the processing machine 1 is moved in the cutting progress direction indicated by a white arrow in the figure. By cutting the rotary blade 12 into the cutting material W, the movable cover 16 is gradually opened against the spring bias. A handle 17 is attached to the rear portion of the movable cover 16. The user can grip the handle 17 and rotate the movable cover 16 in the opening direction against the spring bias, thereby facilitating work such as replacement of the rotary blade 12.

  A handle portion 30 is provided near the coupling portion between the electric motor 50 and the reduction gear train 20. As shown in FIG. 2, the handle portion 30 has a mountain-shaped loop shape extending from the upper portion of the electric motor 50 to the rear portion, and a standing portion 31 that rises upward from the upper portion of the electric motor 50, and an upper portion of the standing portion 31. A main grip portion 32 extending in a rearward downward direction, and a battery attachment portion 33 for coupling the rear portion of the main grip portion 32 to the rear portion of the electric motor 50. The main grip portion 32 is a portion that the user holds with one hand, and a switch lever 35 is disposed on the lower surface side thereof. A front grip part 34 that is held by the user with the other hand is provided on the upper part of the standing part 31 so as to protrude forward.

  Two battery packs 11 can be attached to the battery attachment portion 33 provided between the rear portion of the main grip portion 32 and the electric motor 50. The battery pack 11 can be slid leftward (upward in FIG. 3) and removed from the battery attachment portion 33, and conversely slid rightward (downward in FIG. 3) and attached to the battery attachment portion 33. The removed battery pack 11 can be repeatedly used by charging with a separately prepared charger. The electric motor 50 is activated using the battery pack 11 as a power source.

  As described above, the electric motor 50 is a so-called outer rotor type electric motor. The electric motor 50 includes a stator 52 on the inner peripheral side of the rotor 53. The electric motor 50 in this embodiment is mainly characterized by a support structure for the stator 52 and the rotor 53.

  FIG. 6 shows details of the electric motor 50 according to the first embodiment. The stator 52 is fixed in the motor housing 51. The rotor 53 is supported on the motor shaft 54. The motor shaft 54 is rotatably supported around the motor axis J through bearings 56 and 57. The motor axis J direction output side (left side) bearing 56 is held by the gear housing 21, and the motor axis J direction opposite output side (right side) bearing 57 is held near the counter output side end of the motor housing 51. A ball bearing is used as the bearing 56 on the output side of the motor axis J direction, and a needle bearing is used as the bearing 57 on the output side opposite to the motor axis J direction.

  The motor housing 51 is a resin part manufactured by molding synthetic resin, and is coupled to the anti-saw blade side of the gear housing 21 by a plurality of fixing screws 51a. An intake hole 51 b is provided on the end surface of the motor housing 51 on the side opposite to the saw blade (the end surface on the side opposite to the output). A housing cover 59 is further attached to the end surface of the motor housing 51 on the side opposite to the saw blade. The housing 57 prevents the bearing 57 from coming off, and further protects the lead wires connected to the stator 52.

  A cylindrical support member 55 is provided on the inner surface of the motor housing 51 opposite to the output side. The stator support portion 55 is integrally provided at the center of the inner surface of the motor housing 51 opposite to the output side in a state of protruding toward the output side of the motor axis J direction. The center of the stator support portion 55 coincides with the motor axis J.

  A two-sided width portion 55 a is provided on the outer peripheral surface of the tip of the stator support portion 55. The two-sided width portion 55a is inserted into the center hole 52a having an oval hole shape, and the stator 52 is integrated with the stator support portion 55 with respect to rotation. The inner peripheral hole of the stator support portion 55 penetrates in the motor axis J direction. A screw hole 55b is provided at the mouth of the inner peripheral hole on the saw blade side. A holding hole 55c is provided at the rear side mouth of the inner peripheral hole.

  A stator fixing member 58 is attached to the tip of the stator support portion 55. The stator fixing member 58 includes a hexagonal head portion 58a, a circular flange portion 58d, and a screw shaft portion 58b. The screw shaft portion 58 b is tightened into the screw hole 55 b of the stator support portion 55, and the stator fixing member 58 is attached to the stator support portion 55. The screw shaft part 58b can be tightened firmly by socketing the hexagonal head part 58a. In this attached state, the flange portion 58d of the stator fixing member 58 is brought into contact with the front end surface of the stator 52, and the stator 52 is fixed so as not to move in the motor axis J direction. The two-sided width portion 55a of the stator support portion 55 is inserted into the center hole 52a having an oblong hole shape, and the stator fixing member 58 is attached, so that the stator 52 cannot rotate around the motor axis J and the motor axis J It is supported by the stator support portion 55 in a state in which it cannot move in the direction.

  An insertion hole 58 c is provided on the inner peripheral side of the stator fixing member 58. The motor shaft 54 is inserted through the insertion hole 58c. The bearing 57 that supports the non-output side of the motor shaft 54 is held in the holding hole 55 c of the stator support portion 55. An aluminum rotor base 60 is attached to the motor shaft 54 on the motor axis J direction output side of the stator 52. A steel bush 61 having a smaller thermal expansion coefficient is attached to the inner peripheral hole of the rotor base 60. The bush 61 is press-fitted into the inner peripheral hole of the rotor base 60 and is firmly integrated. The press-fit portion 54a of the motor shaft 54 is press-fitted into the central hole 61a of the bush 61, and the rotor base 60 is fixed to the motor shaft 54 so that it cannot rotate about the axis but cannot be displaced in the axial direction. While the rotor base 60 is made of aluminum, its weight can be reduced. On the other hand, a steel bush 61 that is hard to thermally expand is attached to a portion where the motor shaft 54 is press-fitted, so that the thermal expansion ( The looseness of the press fit is prevented, and the support rigidity of the rotor base 60 with respect to the motor shaft 54 is ensured.

  A rotor 53 is coupled along the periphery of the rotor base 60. The rotor 53 has a cylindrical shape and is attached so as to protrude to the opposite side of the motor axis J direction. The rotor 53 is firmly attached to the rotor base 60 by a plurality of screws 53b. A magnet 53 a attached to the inner peripheral side of the rotor 53 is positioned around the stator 52 with a slight clearance.

  A plurality of blades 60 a are formed on the rotor base 60. Due to the configuration of the plurality of blades 60 a, a cooling fan 62 is integrated with the rotor base 60. The cooling fan 62 rotates integrally with the rotation of the motor shaft 54. Due to the rotation of the cooling fan 62, outside air is introduced into the inside through the intake hole 51 b provided at the opposite end of the motor housing 51, whereby the electric motor 50 is cooled.

  The output side of the motor shaft 54 protrudes from the motor housing 51 to the output side in the motor axis J direction. As described above, the output side of the motor shaft 54 enters the gear housing 21. The drive gear 22 is coupled to the output side end of the motor shaft 54. The rotational output of the electric motor 50 is transmitted to the spindle 25 through the meshing of the drive gear 22 and the driven gear 23, whereby the rotary blade 12 rotates.

  A lock lever 13 for locking the rotation of the motor shaft 54 is provided on the output side of the electric motor 50. When the lock lever 13 is moved and operated in the longitudinal direction, the narrow hole-shaped lock hole 13 a provided in the lock lever 13 is engaged with the two-sided width portion 54 b provided in the motor shaft 54, whereby the motor shaft 54 is engaged. The rotation of is locked. When the rotation of the motor shaft 54 is locked, the rotation of the spindle 25 is locked, and the operation of exchanging the rotary blade 12 is facilitated.

  According to the electric motor 50 according to the first embodiment configured as described above, the rotor base 60 is supported on the motor shaft 54 on the output side (the gear housing 21 side) of the stator 52, and the rotor is supported on the rotor base 60. 53 is supported. As described above, with respect to the position in the motor axis J direction, the rotor 53 is disposed on the output side via the rotor base 60 and the stator 52 is disposed on the non-output side, whereby the electric motor 50 is assembled. In the process, after the motor shaft 54 to which the rotor base 60 and the rotor 53 are attached is assembled to the fixed cover 14 (reduction gear train 20) side, the inner circumference of the rotor 53 is coupled to the gear housing 21 at the stage of coupling the motor housing 51. The stator 52 can be assembled to the side. Therefore, when disassembling the electric motor 50, if the motor housing 51 is separated from the gear housing 21, the state in which the rotor 53 is assembled with the motor shaft 54 on the reduction gear train 20 side is maintained. The stator 52 can be separated from the rotor 53, and the conventional troublesome work of separating the rotor and the stator against the magnetic force of the rotor magnet can be omitted. In view of this, the resolvability of the electric motor 50 and the maintenance performance can be improved.

  Moreover, according to the configuration of the first embodiment, the stator 52 is fixed to the motor housing 51 by the stator fixing member 58. For this reason, when separating the motor housing 51 from the gear housing 21 (on the fixed cover 14 side), the stator 52 is separated from the motor housing 51 integrally. The stator 52 needs to be separated from the rotor 53 against the magnetic force of the magnet 53a. However, since the operator can hold the motor housing 51 and apply a large force, it resists the magnetic force. Thus, the stator 52 can be easily separated. When the motor housing 51 is separated from the fixed cover 14 side, the stator 52 can be separated from the rotor 53 at the same time, so that the subsequent disassembly work can be performed quickly and easily.

  When the motor housing 51 is separated from the fixed cover 14 side, the stator 52 and the rotor 53 are integrated with the motor housing 51 from the fixed cover 14 side in a state where the stator 52 and the rotor 53 are adsorbed to each other by the magnetic force of the magnet 53a. A case of separation is also assumed. Even in this case, since the stator 52 is fixed to the motor housing 51 so as not to move in the motor axial direction by the stator fixing member 58, the operator holds the motor housing 51 larger than the stator 52. Thus, the stator 52 and the rotor 53 can be separated from each other.

  On the other hand, when the motor housing is separated from the fixed cover in the conventional configuration in which the stator is not fixed to the motor housing in the motor axial direction, the motor housing is separated while leaving the stator and the rotor on the fixed cover side. As a result, the stator and the rotor are removed from the fixed cover side in a state where the stator and the rotor are adsorbed to each other. In this case, it is extremely difficult to separate the removed rotor and stator against the magnetic force. Become. Since the stator and rotor are smaller items than the motor housing and cover, it is necessary to apply extremely large force to directly grip the stator and rotor to separate them. Work becomes extremely difficult.

  According to the electric motor 50 exemplified in this way, in the disassembling work, the stator 52 can be handled integrally with the motor housing 51 at the stage of separating the stator 52 and the rotor 53 from each other. Can hold the motor housing 51 which is easier to apply force than the stator 52 and can perform the separation work quickly and easily. In this respect, when the electric motor 50 is disassembled (separation of the stator 52 and the rotor 53) The workability (decomposability) and thus the maintainability can be improved.

  Further, according to the illustrated embodiment, the rotor base 60 is formed with a plurality of blades 60a, and the rotor base 60 has a function as a cooling fan. Therefore, the electric motor 50 can be made compact in the motor axis J direction as compared with a configuration in which a cooling fan is separately supported on the motor shaft 54.

  Various modifications can be made to the embodiment described above. For example, although the configuration in which the stator 52 is fixed to the motor housing 51 side is illustrated, the stator may be fixed to the fixed cover 14 side so as not to move in the motor axial direction. Even in such a configuration, the operator can quickly and easily separate the stator and the rotor from each other by holding the fixed cover that is easier to apply a larger force, and in this respect, is equivalent to the configuration exemplified above. An effect can be obtained.

  Moreover, the electric motor 70 of 2nd Embodiment is shown by FIG. About the structure similar to the electric motor 50 of 1st Embodiment, the description is abbreviate | omitted using a same code | symbol. In the electric motor 70 of the second embodiment, the stator 52 is fixed in the motor axis J direction by a stator fixing member 71 instead of the stator fixing member 58 of the first embodiment.

  As in the first embodiment, the stator 52 is integrated with the stator support 72 in a state of being integrated with respect to rotation by inserting the two-surface width portion 72a of the stator support 72 into the center hole 52a having an oblong hole shape. It is supported.

  The stator fixing member 71 of the second embodiment has a bearing holding portion 71a and a press-fit shaft portion 71b. The press-fit shaft portion 71 b is press-fitted into a press-fit hole 72 b provided in the stator support portion 72, and the stator fixing member 71 is fixed to the stator support portion 72. A fixing screw 73 is fastened to the stator fixing member 71. The fixing screw 73 is tightened along the motor axis J from the outer end surface of the motor housing 51 on the non-output side. When the fixing screw 73 is tightened, the stator fixing member 71 is held in a press-fitted state with respect to the stator support portion 72, whereby the stator fixing member 71 and the stator 52 are rattled (attached state). The mounting state is more firmly fixed so that there is no looseness).

  The bearing holding portion 71 a of the stator fixing member 71 holds a bearing 75 that rotatably supports the non-output side of the motor shaft 54. The motor shaft 54 is rotatably supported by a bearing 75 on the non-output side and a bearing 56 closer to the output side than the bearing 75. A ball bearing is used for the bearing 75 on the non-output side. The output side bearing 56 is a ball bearing as in the first embodiment, and is held by the gear housing 21. In the second embodiment, the output side end portion of the motor shaft 54 is also rotatably supported by the bearing 74. A needle bearing is used as the bearing 74 on the output side end portion side. In the second embodiment, the drive gear 22 is supported on both sides by the output-side bearing 56 and the output-side end-side bearing 74 (supported by three bearings), and the support rigidity thereof is enhanced.

  In the first embodiment, the motor shaft 54 is configured to be inserted through the inner peripheral side of the stator fixing member 58 and the stator support portion 55. On the other hand, in the second embodiment, the opposite end portion of the motor shaft 54 extends to the portion held by the bearing 75 and does not reach the stator support portion 72. Only the press-fit portion 71 b of the stator fixing member 71 and the fixing screw 73 are inserted into the inner peripheral side of the stator support portion 72.

  Also with the electric motor 70 of the second embodiment configured as described above, the rotor base 60 is supported on the motor shaft 54 on the output side (the gear housing 21 side) of the stator 52, and the rotor 53 is supported on the rotor base 60. It has a supported configuration. Therefore, when disassembling the electric motor 70, the fixing screw 51a is loosened to separate the motor housing 51 from the gear housing 21, so that the rotor 53 is assembled together with the motor shaft 54 to the reduction gear train 20 side. The stator 52 can be separated from the rotor 53 while maintaining the state.

  Further, when the motor housing 51 is separated from the gear housing 21 (fixed cover 14 side) and separated from the gear housing 21 side while the rotor 53 is attracted to the stator 52 by the magnetic force of the magnet. Even then, the operator can easily separate the rotor 53 against the magnetic force of the magnet by gripping the motor housing 51 and applying a larger force.

  In addition, at this time, it is not necessary to loosen the fixing screw 73, and the stator fixing member 71 is attached to the stator support portion 72 in a press-fit state, and the stator 52 is fixed to the stator support portion 72. Thus, the stator 52 can be separated from the rotor 53. For this reason, the second embodiment also resists the magnetic force of the magnet of the rotor in a state where the separate rotor and stator are separated as in the prior art (at least one is not fixed to the motor housing or the fixed cover side). Thus, it is not necessary to omit the troublesome work of separation, and in this respect, the resolvability of the electric motor 50 and the maintenance performance can be improved.

  FIG. 8 shows an electric motor 80 of the third embodiment. In the second embodiment exemplified above, a configuration in which the press-fitting shaft portion 71 b of the stator fixing member 71 is press-fitted into the press-fitting hole 72 b of the stator support portion 72 to fix the stator fixing member 71 to the stator support portion 72. In the electric motor 80 of the third embodiment, the stator fixing member 81 includes a support shaft portion 81b instead of the press-fit shaft portion 71b, and the stator support portion 82 is adjusted instead of the press-fit hole 72b. It is the structure provided with the hole 82b. The stator fixing member 81 includes a bearing holding portion 81a for holding a bearing 75 on the counter-output side that rotatably supports the motor shaft 54, similarly to the bearing holding portion 71a of the second embodiment. Moreover, the stator support part 82 is provided with the two-surface width part 82a for integrating the stator 52 about rotation similarly to the two-surface width part 72a of 2nd Embodiment. Further, in the third embodiment, the bearing 74 that rotatably supports the output side end portion of the motor shaft 54 is omitted. This is the same as in the first embodiment.

  In the electric motor 80 according to the third embodiment, the inner diameter of the adjustment hole 82b of the stator support portion 82 is set larger than the outer diameter of the support shaft portion 81b of the stator fixing member 81. For this reason, an appropriate clearance is generated between the support shaft portion 81b and the adjustment hole 82b. The stator fixing member 81 can be adjusted in position in the radial direction (direction perpendicular to the motor axis) with respect to the stator support portion 82 by the clearance. Therefore, by loosening the fixing screw 73 and adjusting the position of the stator fixing member 81 in the radial direction, the position of the rear side of the motor shaft 54 can be adjusted in the same direction, whereby the rotor 53 with respect to the stator 52 can be adjusted. Contact (so-called core rubbing) can be prevented.

  Also with the electric motor 80 of the third embodiment, the rotor 53 is attached to the rotor base 60 supported by the motor shaft 54 on the output side of the stator 52 at the position in the motor axis J direction, as in the first and second embodiments. It has been. Further, the stator 52 is fixed to a stator support portion 82 provided on the end face on the opposite side of the motor housing 51. Therefore, when the electric motor 80 is disassembled, if the fixing screw 51a is loosened and the motor housing 51 is separated from the gear housing 21, the stator 52 fixed to the motor housing 51 resists the attractive force of the magnet 53a and the rotor. 53. At this time, it is not necessary to loosen the fixing screw 73, and it is sufficient that the stator fixing member 81 is fixed to the stator support portion 82. When the motor housing 51 is separated from the gear housing 21, the opposite end portion of the motor shaft 54 is detached from the bearing 75.

  Thus, also in the electric motor 80 of the third embodiment, if the motor housing 51 is separated from the gear housing 21, the stator 52 is simultaneously separated from the rotor 53. It can be increased, and as a result, its maintainability can be improved. Even when the rotor 53 is separated from the gear housing 21 (fixed cover 14 side) together with the stator 52 by the magnetic force of the magnet when the motor housing 51 is separated from the gear housing 21, the subsequent work is performed. Since a person can grip a motor housing 51 larger than the stator 52 and apply a force for separating the stator 52 and the rotor 53, it can be compared with a case where a force is applied by directly gripping the stator 52. Thus, the rotor 53 can be easily separated.

  The electric motor 50 (70, 80) of the first to third embodiments described above can be further modified. For example, a steel bush 61 having a small thermal expansion coefficient is press-fitted and integrated at the center of an aluminum rotor base 60, and a press-fit portion 54 a of the motor shaft 54 is press-fitted into the center hole 61 a of the bush 61. Although the support rigidity for the motor shaft 54 of 60 is increased, the bush 61 may be omitted. Conversely, the entire rotor base may be made of steel.

  In addition, the configuration in which the rotor base 60 is provided with a plurality of blades 60a and the rotor base 60 functions also as a cooling fan is illustrated, but a configuration in which a cooling fan is separately disposed on the motor shaft 54 may be employed.

  Further, in the second embodiment, the output side end of the motor shaft 54 is supported by the bearing 74 and the drive gear 22 is supported at both ends. However, the bearing 74 is omitted and the drive gear 22 is the first and first. It is good also as a structure which cantilever-supports like 3 embodiment.

  Moreover, although the resin motor housing 51 is illustrated, it can be changed to an aluminum motor housing. By using an aluminum motor housing, the dimensional accuracy of each part of the motor housing can be increased.

  Even when an aluminum motor housing is used as described above, the stator support portion can be integrally provided on the opposite end face of the motor housing. In this case, a stator support portion made of aluminum is provided with a press-fit shaft portion instead of the illustrated two-sided width portion 55a (72a, 82a), and the press-fit shaft portion is press-fitted into the circular center hole of the stator. Thus, the stator can be fixed to the stator support portion. In the case of such a configuration, since the stator directly contacts the aluminum stator support portion, the heat generated by the stator can be released to the stator support portion and the motor housing, and the heat dissipation of the electric motor can be improved. Can do.

  In addition, as an example of the processing machine 1, a so-called portable marlino has been exemplified, but a so-called tabletop marine saw or a chip saw in a form in which a cutting tool is cut by moving the main body of the processing machine down on a processing material placed on a table, An outer rotor type electric motor having a configuration exemplified for a cutter for performing processing such as grooving by rotating a cutting tool such as a diamond wheel or a grindstone can be similarly applied.

W ... Cutting material 1 ... Processing machine 2 ... Base 10 ... Tool body 11 ... Battery pack 12 ... Rotary blade 13 ... Lock lever, 13a ... Lock hole 14 ... Fixing cover 15 ... Oscillating support shaft 16 ... Movable cover 17 ... Handle 20 ... reduction gear train 21 ... gear housing 22 ... drive gear 23 ... driven gear 25 ... spindle 26 ... receiving flange 27 ... holding flange 28, 29 ... bearing 30 ... handle part 31 ... standing part 32 ... main grip part 33 ... battery attachment part 35 ... Switch lever 50 ... Electric motor (first embodiment)
J: Motor shaft 51 ... Motor housing 51a ... Fixing screw, 51b ... Intake hole 52 ... Stator, 52a ... Center hole 53 ... Rotor, 53a ... Magnet, 53b ... Screw 54 ... Motor shaft, 54a ... Press-fit portion, 54b ... Two-sided width portion 55 ... Stator support portion 55a ... Two-sided width portion, 55b ... Screw hole, 55c ... Holding hole 56, 57 ... Bearing 58 ... Stator fixing member 58a ... Head, 58b ... Screw shaft portion, 58c ... Insertion hole, 58d ... flange portion 59 ... housing cover 60 ... rotor base, 60a ... blade 61 ... bushing, 61a ... center hole 62 ... cooling fan 70 ... electric motor (second embodiment)
71 ... Stator fixing member 71a ... Bearing holding portion, 71b ... Press-fit shaft portion 72 ... Stator support portion 72a ... Two-sided width portion, 72b ... Press-fit hole 73 ... Fixing screw 74, 75 ... Bearing 80 ... Electric motor (third Embodiment)
81 ... Stator fixing member 81a ... Bearing holding part, 81b ... Support shaft part 82 ... Stator support part 82a ... Two-sided width part, 82b ... Adjustment hole

Claims (8)

A processing machine comprising a rotating blade, an electric motor as a drive source for rotating the blade, a motor housing that houses the electric motor, and a fixed cover that covers the blade,
The electric motor is an outer rotor type electric motor provided with a stator on the inner peripheral side of the rotor,
The rotor is fixed to a motor shaft via a rotor base and is rotatably supported with respect to the fixed cover, and the stator is fixed to the motor housing side so as not to move in the motor axis direction. The processing machine arrange | positioned at the inner peripheral side of the said rotor. 2. The processing machine according to claim 1, wherein a stator support portion is protruded in a motor axial direction inside the motor housing, and the stator is fixed near a tip of the stator support portion. The processing machine according to claim 2, wherein a stator fixing member is attached to the stator support portion, and the stator is fixed to the stator support portion. The processing machine according to any one of claims 1 to 3, wherein a bearing on a counter-output side of two bearings that rotatably support the motor shaft is held by the stator support portion or the stator fixing member. Processing machine. The processing machine according to any one of claims 1 to 4, wherein a plurality of blades are provided on the rotor base so that the rotor base functions as a cooling fan. 6. The processing machine according to claim 1, wherein the motor housing is coupled to a fixed cover in which the rotor is assembled in advance, whereby the fixing is performed on the inner peripheral side of the rotor. A processing machine with a configuration in which a child is placed. A processing machine comprising a rotating blade, an electric motor as a drive source for rotating the blade, a motor housing that houses the electric motor, and a fixed cover that covers the blade,
The electric motor is an outer rotor type electric motor provided with a stator on the inner peripheral side of the rotor,
The stator is fixed to one of the motor housing or the fixed cover so as not to move in the motor axial direction, and the motor housing is mounted in a state where the stator and the rotor are attracted to each other by magnetic force of a magnet. A processing machine that can be separated from the fixed cover. The electric motor used for the processing machine as described in any one of Claims 1-7.

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