WO2020100423A1 - Portable grinding machine - Google Patents

Portable grinding machine Download PDF

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Publication number
WO2020100423A1
WO2020100423A1 PCT/JP2019/036782 JP2019036782W WO2020100423A1 WO 2020100423 A1 WO2020100423 A1 WO 2020100423A1 JP 2019036782 W JP2019036782 W JP 2019036782W WO 2020100423 A1 WO2020100423 A1 WO 2020100423A1
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WO
WIPO (PCT)
Prior art keywords
fan
electric motor
controller
housing
pad
Prior art date
Application number
PCT/JP2019/036782
Other languages
French (fr)
Japanese (ja)
Inventor
智紀 ▲高▼田
Original Assignee
株式会社マキタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社マキタ filed Critical 株式会社マキタ
Publication of WO2020100423A1 publication Critical patent/WO2020100423A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

  • the present invention relates to a portable polishing machine such as a portable sander, a grinder, and a polisher.
  • the fan is fixed to the central portion of the output shaft where the pad is attached to the lower end, and the fan rotates to allow the fan to rotate inside the housing.
  • Wind is generated from the upper side to the lower side to cool the motor.
  • Thunder's motor is a brushed motor.
  • the controller is arranged in a rearward-down posture at the top of the housing. Here, the controller is naturally cooled and not actively cooled.
  • Patent Document 2 a controller arranged in the rear cover with the intake port open and behind the brushed motor is The air is cooled together with the motor by the wind generated by the rotation of the centrifugal fan fixed to the motor shaft on the front side.
  • Patent Document 1 The sander of Patent Document 1 is for naturally cooling the controller. Therefore, there is room for improvement in cooling efficiency by actively cooling.
  • the random orbit sander of patent document 2 cools a controller with a motor with one centrifugal fan. Therefore, there is room for improvement in cooling efficiency.
  • the present invention aims to increase the cooling efficiency of the controller of the motor of a portable polishing machine.
  • the portable polishing machine of the present invention is Pad, An electric motor for driving the pad, A controller for controlling the electric motor, A first fan for cooling the electric motor; A second fan for cooling the controller, Have.
  • the cooling efficiency of the motor controller can be increased.
  • FIG. 1 is a perspective view of a portable polishing machine according to an embodiment.
  • the portable polishing machine is, for example, a portable sander 1.
  • FIG. 2 is a right side view of the sander 1.
  • FIG. 3 is a left side view of the sander 1.
  • FIG. 4 is a top view of the sander 1.
  • FIG. 5 is a vertical cross-sectional view of the center of the sander 1 in the left-right direction (the battery 8 is a right side view).
  • FIG. 6 is a transverse sectional view of the center of the sander 1 in the front-rear direction.
  • FIG. 7 is a sectional view taken along the line AA of FIG.
  • the sander 1 includes a housing 2, an electric motor 4, a controller 6, a switch 7, a battery 8, an output shaft 10, a first fan 12, a pad 14, a second fan 16, and a dust collection nozzle 18.
  • the housing 2 holds various members directly or indirectly.
  • the electric motor 4 is a drive source.
  • the controller 6 controls the electric motor 4.
  • the switch 7 is electrically connected to the controller 6.
  • the battery 8 is a power supply source for the electric motor 4.
  • the first fan 12 is provided on the lower edge of the output shaft 10.
  • the pad 14 is provided below the output shaft 10.
  • the second fan 16 is provided above the electric motor 4.
  • the dust collection nozzle 18 has a magnifying glass frame shape and is attached to the lower end of the housing 2.
  • the housing 2 is a half housing having a left housing 2L and a right housing 2R.
  • a plurality of screw bosses 20 (Fig. 5) are formed on the left housing 2L.
  • a screw hole 22 corresponding to the screw boss 20 is formed in the right housing 2R.
  • a screw 24 is passed through the corresponding screw boss 20 and screw hole 22 to form the housing 2.
  • the upper portion 2a (first grip portion) of the housing 2 can be gripped by one hand of the user.
  • the sander 1 is a palm type that can be operated on the upper portion 2a.
  • the front surface of the switch 7 is exposed at the front end of the upper portion 2a.
  • the switch 7 has a stop button 26 and a startup speed switching button 28 on the front surface.
  • the stop button 26 and the activation speed switching button 28 are arranged side by side in the left-right direction.
  • the stop button 26 and the activation speed switching button 28 may be arranged side by side in the vertical direction or the like.
  • buttons having different roles such as a start / stop button and a speed switching button may be provided, or three or more buttons may be provided.
  • a switch switching unit other than the buttons such as the speed switching dial may be provided.
  • a bulge 30 is formed at the front end of the housing 2 and below the switch 7.
  • the bulging portion 30 bulges forward with respect to the surrounding portion.
  • the bulging portion 30 may be provided at a portion other than the front end portion such as a side portion of the front portion, a plurality of bulging portions 30 may be provided, or may be omitted.
  • the housing 2 has a battery mounting portion 32 at the rear end.
  • the battery 8 is attached to the battery attachment portion 32.
  • a terminal 34 (FIG. 5) electrically connected to the mounted battery 8 is arranged.
  • the battery 8 is attached by sliding the battery 8 from above the battery attaching portion 32 so that the battery claw 8b (FIG. 5) connected to the battery button 8a is hooked on the battery attaching portion 32.
  • the battery 8 is removed by sliding the battery button 8a rearward and then sliding the battery 8 upward.
  • the battery 8 is attached to the front lower side, and the upper end portion of the battery 8 is aligned with the upper surface of the upper portion 2a of the housing 2.
  • the battery 8 is a rechargeable battery that can be charged by a charger. Thunder 1 is a rechargeable thunder.
  • the upper part 2a of the housing 2 bulges out to both sides.
  • the protrusions 2b protrude to both sides.
  • a constricted portion 36 is provided on both sides of the sander 1 between the upper portion 2a and the protruding portion 2b.
  • each constricted portion 36 is similar to each other on the left and right, one constricted portion 36 will be mainly described.
  • the constricted portion 36 becomes deeper inward as it goes backward.
  • the constricted portion 36 is formed of a smooth curved surface as a whole.
  • the battery mounting portion 32 is arranged on the rear side of the constricted portion 36 and projects sideward.
  • the outer dimension from the rear edge to the front edge of the constricted portion 36 is the dimension from the tip of a finger (especially the middle finger) other than the thumb of the general user's hand to the center of the palm.
  • the left and right constricted portions (second grip portions) 36 can be gripped by the user from the front.
  • the outer dimension from the rear edge to the front edge of the constricted portion 36 is the dimension from the tip of a finger (especially the middle finger) other than the thumb of the general user's hand to the center of the palm. Therefore, the rear end edge of the constricted portion 36 is located deeper (above the battery mounting portion 32) than above the center of gravity of the entire sander 1 in which the battery 8 is mounted. Since the electric motor 4 and the battery 8 which are relatively heavy are opposed to each other with the output shaft 10 interposed therebetween, the center of gravity is located near the output shaft 10.
  • a depression 37 is formed on the constriction 36.
  • the recess 37 is further recessed with respect to the lower side of the recess 37.
  • the recess 37 is formed to be long in the front-rear direction (horizontal direction), and the length in the front-rear direction is about the length of the user's finger (particularly the index finger).
  • the recessed portion 37 has a depth that is about half the thickness of the finger, and has a width that is similar to the width of the finger.
  • the recess 37 is provided with a plurality of (three) protrusions 38 protruding laterally.
  • the plurality of protrusions 38 have the same shape as each other.
  • Each protrusion 38 has a V-shape that is pointed forward.
  • the protrusions 38 are arranged at equal intervals in the front-rear direction and cover the center or the whole of the user's finger (particularly the index finger).
  • a recess 39 is formed at the rear end edge of each constricted portion 36.
  • the recess 39 is deeper than the surroundings.
  • the concave portion 39 is long along the vertical direction, and when the constricted portion 36 is touched from the front, the fingertips of the middle finger and the ring finger of the general user are located in the concave portion 39.
  • the height from the upper end of the recess 37 to the lower end of the recess 39 is about the same as the width from the index finger to the little finger of a general user.
  • a wireless communication adapter insertion portion 40 is formed at the upper end of the right constricted portion 36 and at the rear end of the right recess 37, and below the upper portion 2a of the right housing 2R.
  • the wireless communication adapter insertion part 40 is recessed in a box shape to the left with respect to the surroundings.
  • a wireless communication adapter 41 can be inserted into the wireless communication adapter insertion section 40. When the wireless communication adapter 41 is inserted into the wireless communication adapter insertion section 40, the wireless communication adapter 41 is electrically connected to a wireless communication controller (not shown) mounted on the controller 6.
  • the wireless communication adapter 41 performs wireless communication with a dust collector (not shown) as an auxiliary equipment.
  • the start and stop operations of the dust collector are linked to the start and stop operations of the sander 1 by wireless communication.
  • association (pairing) for enabling wireless communication is performed between the wireless communication adapter 41 and the dust collector-side wireless communication adapter attached to the dust collector.
  • the pairing is performed by the user pressing the button of the dust collector-side wireless communication adapter and operating the button 41a of the wireless communication adapter 41 within a predetermined time.
  • the shape of the housing 2 may not be half.
  • the housing 2 may have an inner housing. At least one of the recess 37, the protrusion 38, and the recess 39 may be arranged only in the one constricted portion 36, or the constricted portion 36 may be arranged in only one of the left and right sides.
  • the grips may be arranged at one place or at three or more places.
  • the wireless communication adapter insertion unit 40 may be omitted.
  • a plurality of first exhaust ports 42 are formed in each of the protrusions 2b at the bottom of the housing 2. Each first exhaust port 42 extends in the front-rear direction. The plurality of first exhaust ports 42 are arranged in the front-rear direction. A plurality of first intake ports 44 are formed at the front center of each constricted portion 36 and below each recess 37. Each first intake port 44 extends in the vertical direction. The plurality of first intake ports 44 are arranged in the front-rear direction.
  • a plurality of second exhaust ports 46 are formed above the respective left and right first intake ports 44 and below each recess 37. Each second exhaust port 46 extends in the vertical direction. The plurality of second exhaust ports 46 are arranged in the front-rear direction.
  • a plurality of second intake ports 48 are formed on the left and right edges of the upper portion 2a of the housing 2. Each second intake port 48 extends in the vertical direction. The plurality of second intake ports 48 are arranged in the front-rear direction.
  • a third intake port 49 extending in the left-right direction is formed in the lower front portion of each constricted portion 36.
  • a plurality of dust collection exhaust ports (not shown) are formed at the lower end of the housing 2 and below each of the protrusions 2b. Each dust collection exhaust port extends in the left-right direction. The plurality of dust collection exhaust ports are arranged side by side in the front and rear and in the top and bottom.
  • the number of at least one of these various exhaust ports and intake ports may be increased or decreased. Further, for example, the arrangement may be changed so that it is provided on only one of the left and right sides or is provided at an asymmetrical position. Further, at least one of the shape and the size such as the extending direction and the length and the outer shape may be changed.
  • the electric motor 4 is a DC-driven brushless motor.
  • the electric motor 4 is an inner rotor type in which a rotor 52 is arranged radially inward of a cylindrical stator 50. In the brushless motor in which the controller 6 relatively easily generates heat, the electric motor 4 and the controller 6 are sufficiently cooled.
  • the electric motor 4 may be an AC-driven brushless motor, an outer rotor type in which a rotor 52 is arranged radially outside the stator 50, or a brushless motor other than a brush type motor.
  • the stator 50 has a stator core 60, a first insulating member 62, a second insulating member 64, a plurality of coils 66, and a motor terminal 68.
  • the first insulating member 62 is arranged above the stator core 60.
  • the second insulating member 64 is arranged below the stator core 60.
  • a plurality of (six) coils 66 are wound around the stator core 60 via the first insulating member 62 and the second insulating member 64.
  • the motor terminal 68 is electrically connected to the plurality of coils 66 in a predetermined wiring manner.
  • the motor terminal 68 projects forward from the front portion of the second insulating member 64.
  • the motor terminal 68 is connected to the controller 6 by a plurality of first lead wires 70 (only one is shown in FIG. 5). Lower portions of the motor terminal 68 and the first lead wire 70 are arranged in the bulging portion 30.
  • the sensor substrate 72 is attached to the second insulating member 64.
  • a plurality of rotational position sensors (not shown) that magnetically detect the rotational position of the rotor 52 are mounted on the sensor substrate 72.
  • the rotor 52 includes an electric motor shaft 80, a rotor core 82, a plurality of permanent magnets 84, a plurality of permanent magnets for rotational position sensors, and a sleeve 86.
  • the electric motor shaft 80 has a columnar shape and extends vertically.
  • the rotor core 82 has a cylindrical shape and is fixed to the central portion of the electric motor shaft 80.
  • the plurality (four) of permanent magnets 84 are plate-shaped and are embedded inside the curved surface of the rotor core 82 so as to be arranged in a state in which the polarities are alternately changed in the circumferential direction.
  • the plurality of rotational position sensor permanent magnets (not shown) are arranged radially below the electric motor shaft 80, the rotor core 82, and the plurality of permanent magnets 84 (on the sensor substrate 72 side).
  • the sleeve 86 has a horizontal plate shape and is arranged above the electric motor shaft 80, the rotor core 82, and the plurality of permanent magnets 84.
  • the second fan 16 is fixed to the upper side of the sleeve 86 and above the electric motor shaft 80. Therefore, the second fan 16 is efficiently driven by the electric motor 4 that drives the pad 14.
  • the second fan 16 is a centrifugal fan.
  • the second fan 16 may be a component of the electric motor 4.
  • the second fan 16 may be another type of fan such as an axial fan.
  • the second fan 16 partially overlaps the controller 6 from the viewpoint (top view) of the sander 1 from the upper side to the lower side in the vertical direction. That is, the front portion of the controller 6 is located above the rear portion of the second fan 16. Therefore, the controller 6 is efficiently cooled, and the sander 1 becomes compact in the front-rear direction or the left-right direction.
  • the second fan 16 may entirely overlap the controller 6 in a top view. Further, the controller 6 may be arranged below the second fan 16.
  • the first electric motor bearing 88 is arranged above the second fan 16.
  • the first electric motor bearing 88 rotatably supports the electric motor shaft 80.
  • a second electric motor bearing 90 is arranged below the electric motor shaft 80.
  • the second electric motor bearing 90 rotatably supports the electric motor shaft 80.
  • An electric motor-side pulley 91 is fixed to the lower end of the electric motor shaft 80.
  • the electric motor 4 is held in the front center of the housing 2 by the ribs 92A to 92F.
  • the ribs 92A to 92F project inward from the inner surfaces of the left housing 2L and the right housing 2R.
  • the electric motor 4 is arranged on the side opposite to the battery 8 with respect to the output shaft 10.
  • the first electric motor bearing 88 is held by the uppermost pair of ribs 92A.
  • the second fan 16 is arranged between the rib 92A and the rib 92B below the rib 92A.
  • a plurality of ventilation holes 92h (FIG. 5) for ventilation are formed in the rib 92A.
  • the second exhaust ports 46 are located outside the second fan 16 and above the ribs 92B.
  • the front end of the rib 92B extends upward and covers the front of the second fan 16.
  • a hole for passing the electric motor shaft 80 is formed in the center of the rib 92B.
  • the ribs 92C and 92D below the ribs 92B hold the stator 50.
  • the ribs 92E and 92F on the lower side hold the second electric motor bearing 90 via a plate-shaped motor bracket 94 that spreads in the front, rear, left, and right directions.
  • the electric motor side pulley 91 is arranged below the rib 92F.
  • the controller 6 has a control circuit board.
  • the controller 6 is held in a horizontal posture by ribs 98 formed at the front and rear of the upper portion 2a of the housing 2.
  • a plurality of (six) switching elements (not shown) and a capacitor 99 are mounted on the controller 6 (control circuit board).
  • the plurality of switching elements rotate the motor 11.
  • the electric motor 4 is a brushless motor. Brushless motors are much more compact while ensuring the same output as brushed motors. Therefore, the capacitor 99 can be arranged at a location (upstream) adjacent to the electric motor 4, and the sander 1 becomes compact. Further, the condenser 99 is sufficiently cooled.
  • the controller 6 is electrically connected to the terminal 34 of the battery mounting portion 32 by a plurality of second lead wires 100 (only one is shown in FIG. 5).
  • the controller 6 switches the power supply to each coil 66 by the switching element in accordance with the rotational position of the rotor 52 grasped by the rotational position sensor of the sensor substrate 72, and turns the rotor 52 on. Rotate.
  • the switch 7 is switched on in the high-speed mode when the activation speed switching button 28 is pressed once in the off state. When the switch 7 is further pressed once, the switch 7 is turned on in the medium speed mode. When the switch 7 is further pressed once, the switch 7 is turned on in the low speed mode. The switch 7 is switched to the high speed mode when the activation speed switching button 28 is further pressed once. In any mode, the switch 7 is turned off when the stop button 26 is pressed. When the switch 7 is turned on, the controller 6 rotates the rotor 52 at a speed according to the type of mode. Other modes may be provided and speed switching may be omitted.
  • the output shaft 10 has a cylindrical shape and extends vertically.
  • the output shaft 10 is rotatably held around its central axis in the central portion of the housing 2.
  • a first output bearing 110 is arranged at the upper end of the output shaft 10.
  • the first output bearing 110 rotatably supports the output shaft 10.
  • a second output bearing 112 is arranged below the output shaft 10.
  • the second output bearing 112 rotatably supports the output shaft 10.
  • An output shaft side pulley 114 is fixed to the lower part of the output shaft 10 and below the second output bearing 112.
  • the first fan 12 is fixed to the lower end of the output shaft 10.
  • the first output bearing 110 is held by the first output bearing holder 120.
  • the first output bearing holding portion 120 has a lower open box shape and projects inward from the inner surfaces of the left housing 2L and the right housing 2R.
  • the front surface portion of the first output bearing holding portion 120 connects the rear end portion of the rib 92A and the rear end portion of the rib 92B and covers the rear side of the second fan 16.
  • the upper surface portion of the first output bearing holding portion 120 is integrated with the lower surface portion of the wireless communication adapter insertion portion 40.
  • a rear rib 121 (FIG. 5) arranged on the rear side of the output shaft 10 extends from the lower rear portion of the first output bearing holding portion 120.
  • the rear rib 121 has a side view “L” shape extending downward and rearward.
  • the rear rib 121 holds the lower portion of the terminal 34 at the rear lower end portion.
  • the second output bearing 112 is held on the rear portion of the motor bracket 94.
  • the motor bracket 94 holds the second electric motor bearing 90 at the front part.
  • the output shaft side pulley 114 is arranged below the motor bracket 94.
  • a belt 122 is wound around the output shaft side pulley 114 and the electric motor side pulley 91.
  • the diameter of the electric motor side pulley 91 is smaller than the diameter of the output shaft side pulley 114.
  • the rotation of the electric motor shaft 80 is decelerated by the output shaft side pulley 114, the electric motor side pulley 91 and the belt 122 (reduction mechanism), and is transmitted to the output shaft 10.
  • the first fan 12 is a horizontal disk-shaped member, and has a plurality of first blade portions 12a and a thick portion 12b in the upper portion.
  • the first blade portion 12a extends in a curved radial shape from the center to the peripheral edge and projects upward.
  • the thick portion 12b is formed by joining the outer tip portions of some of the first blade portions 12a at a part of the peripheral edge.
  • the first fan 12 has a plurality of second blade portions 12c and a thick portion 12d in the lower portion.
  • the second blade portion 12c extends in a curved radial shape from the center to the peripheral edge and projects downward.
  • the thick portion 12d is formed in a position symmetrical with respect to the thick portion 12b in a part of the peripheral edge.
  • the first exhaust ports 42 are located radially outward of the first blade portions 12a.
  • the lower end of the housing 2 is opened downward.
  • Each second blade portion 12c is located in the lower end portion of the housing 2 and below each protruding portion 2b.
  • a dust collection nozzle 18 is attached to the outside in the radial direction of the lower end of the housing 2 having a dust collection exhaust port (the lower side of each protrusion 2b).
  • a hinge 18b is provided on the ring-shaped portion 18a of the dust collection nozzle 18. The user opens the dust collecting nozzle 18 at the hinge 18b, closes the lower end of the housing 2, and inserts the screw 18d into the screw hole provided between the ring-shaped portion 18a and the handle-shaped portion 18c.
  • the dust collecting nozzle 18 is attached to the lower end of the housing 2.
  • the ring-shaped portion 18a has a semi-cylindrical shape.
  • the ring-shaped portion 18a covers the lower end portion of the housing 2 by mounting.
  • the handle 18c has a tubular shape when closed. When the dust collecting nozzle 18 is attached, the handle 18c may be projected rearward as shown, or may be projected in another direction.
  • a bag-shaped dust bag (not shown) having a dust collection port or a dust collector (not shown) is connected to the dust collection nozzle 18 (handle 18c).
  • the dust collector that is paired with the wireless communication adapter 41 is connected and the sander 1 is activated by the switch 7, activation information indicating activation is transmitted from the wireless communication adapter 41 to the dust collector.
  • the dust collector-side wireless communication adapter receives the activation information, and the dust collector is automatically activated.
  • the wireless communication state is notified to the user by the lighting state of the lamp 41b provided on the wireless communication adapter 41.
  • stop information indicating the stop is transmitted from the wireless communication adapter 41 to the dust collector.
  • the dust collector-side wireless communication adapter receives the stop information, and the dust collector automatically stops. That is, the wireless communication adapter 41 links the ON / OFF of the sander 1 with the ON / OFF of the dust collector.
  • the pad 14 is attached to the tip of the output shaft 10.
  • a sanding disk (not shown) for polishing which is an example of a tip tool, is attached to the lower surface of the pad 14 via a surface fastener or the like.
  • a sponge pad, a felt pad, or a wool pad may be attached as the tip tool. Further, the pad 14 may be integrated with the tip tool.
  • the pad 14 has a pad body 130 and a pad bearing member 132.
  • the pad bearing member 132 is arranged above the pad body 130.
  • the pad bearing device 132 includes a ball bearing 134, an inner bearing retainer (flat washer) 136, and an outer bearing retainer 138.
  • the inner bearing retainer 136 is fixed to the inner cylinder of the ball bearing 134.
  • the outer bearing retainer 138 is fixed to the outer cylinder of the ball bearing 134.
  • a hole is formed in the inner bearing retainer 136 at a position eccentric from the rotation axis of the ball bearing 134 to allow the inner screw 140 to be inserted into the tip portion of the output shaft 10.
  • the inner bearing retainer 136 is disposed below the inner cylinder of the ball bearing 134 and supports the ball bearing 134 from below.
  • a lower protruding portion 12e of the center of the first fan 12 is inserted inside the inner cylinder of the ball bearing 134, and the output shaft 10 is also passed through the lower protruding portion 12e.
  • the lower protrusion 12e is eccentric to the output shaft 10. Holes are formed in both the outer bearing retainer 138 and the pad body 130 for passing the outer screws 142 that connect the outer bearing retainer 138 and the pad body 130.
  • the thick-walled portions 12b and 12d of the first fan 12 are arranged as weights (weights) at the above positions in consideration of the eccentric state of the pad 14.
  • the thick portions 12b and 12d serve as counterweights for adjusting the rotation and eccentric rotation (orbital rotation) of the pad 14 by the ball bearings 134 and the like.
  • the sander 1 operates as follows, for example.
  • the operation stopped (off) state the user attaches the battery 8 to the battery mounting portion 32 and turns on the switch 7.
  • the controller 6 supplies the electric power of the battery 8 to the electric motor 4, and the electric motor shaft 80 rotates at a predetermined speed.
  • the electric motor shaft 80 rotationally drives the output shaft 10 via the electric motor side pulley 91 fixed to the electric motor shaft 80, the belt 122 and the output shaft side pulley 114.
  • the rotation of the output shaft 10 causes the pad 14 to eccentrically rotate as follows. That is, the pad body 130 rotates (revolves) around the output shaft 10 via the ball bearing 134 and the outer bearing retainer 138.
  • rolling resistance is generated due to mutual force being exerted between the inner cylinder, the ball, and the outer cylinder of the ball bearing 134, and the pad 14 rotates about the ball bearing 134 in the same direction as the revolution. Do (rotate).
  • the frictional resistance inside the ball bearing 134 is unstable, it may or may not rotate irregularly.
  • the user grips at least one of the upper portion 2a of the housing 2 and the left and right constricted portions 36 and moves the pad 14 thus rotated while pressing the pad 14 against the work. Thereby, the surface of the work can be polished or the like through the sanding paper or the like.
  • the bulged portions 30 formed between the both constricted portions 36 enable the bulged portion 30 to support the center of the palm. Therefore, the second grip portion is easier to grip than the case without the bulging portion 30.
  • the rotation of the electric motor shaft 80 rotates the second fan 16, and the rotation of the output shaft 10 rotates the first fan 12.
  • Air is exhausted from each first exhaust port 42 by each first blade portion 12a of the rotating first fan 12. Due to this exhaust, air flows in from each first intake port 44 and each third intake port 49, and a wind W1 from each first intake port 44 to each first exhaust port 42 is generated as shown in FIG. ..
  • the wind W1 cools the electric motor 4 by passing outside the electric motor 4 and between the stator 50 and the rotor 52 (inside the electric motor 4).
  • the pair of ribs 92B (partition walls) are arranged above each first intake port 44. Therefore, due to the exhaust from each first exhaust port 42, air flows in from each second intake port 48 and the like on the opposite side across the rib 92B, and the wind from each first intake port 44 to each first exhaust port 42. Merging with W1 is prevented.
  • Air is exhausted from each dust collection exhaust port by each second blade portion 12c of the rotating first fan 12. By this exhaust, air that may contain dust around the pad 14 is sucked, and wind WD from the periphery of the pad 14 to each dust collecting exhaust port is generated.
  • the exhaust air from each dust collecting exhaust port flows from the ring-shaped portion 18a of the dust collecting nozzle 18 to the handle portion 18c, and reaches the dust bag or the dust collector.
  • Air is exhausted from each second exhaust port 46 by the rotating second fan 16. Due to this exhaust, air flows in from each second intake port 48, and wind W2 from each second intake port 48 to each second exhaust port 46 is generated.
  • the wind W2 passes around the controller 6 (control circuit board) arranged upstream of the second fan 16 and cools the controller 6. Further, the wind W2 reaches the second fan 16 through the ventilation hole 92h of the rib 92A.
  • the rib 92B is arranged below each second exhaust port 46. Therefore, by the exhaust air from each second exhaust port 46, air flows in from each first intake port 44 and the like on the opposite side with the rib 92B interposed therebetween, and the wind from each second intake port 48 to each second exhaust port 46. Merging with W2 is prevented.
  • the electric motor 4 is cooled by the first fan 12 (each first blade portion 12a), and the controller 6 is cooled by the second fan 16.
  • the rib 92B as a partition wall arranged between the first fan 12 and the second fan 16, a first section (lower part) in which the electric motor 4 and the first fan 12 are arranged, the controller 6 and the second fan 16 are formed.
  • the second section (upper part) in which is arranged is determined. More specifically, the rib 92B, the first output bearing holding portion 120, and the rear rib 121 separate the upper portion and the lower portion inside the housing 2.
  • the wind W1 of the first fan 12 and the wind W2 of the second fan 16 are hard to mix, the wind W1 of the first fan 12 cools the electric motor 4, and the wind W2 of the second fan 16 cools the controller 6. ..
  • the wind W1 of the first fan 12 that cools the electric motor 4 passes through the first section, and the wind W2 of the second fan 16 that cools the controller 6 passes through the second section.
  • the winds W1 and W2 are separated by the ribs 92B and independently flow without obstructing the other to cool the controller 6 or the electric motor 4 efficiently.
  • the second fan 16 may cool other members such as the electric motor 4 in addition to the controller 6.
  • the first fan 12 is similar to the second fan 16.
  • the partition wall of the housing 2 may be a separate body from the left housing 2L and the right housing 2R, and may be erected on the inner surface of at least one of them, or may have a cavity as another compartment inside. Is also good. At least one of the shape and the number of each part of the first fan 12 may be changed, a function of a thick part (balance part) may be imparted to a part of the blade part, and the thick part may have a thick part. It may be omitted.
  • the pad 14 may be directly fixed to the output shaft 10 so that the lower central portion of the first fan 12 does not enter the inner cylinder of the ball bearing 134.
  • a direct mounting method in which the battery 8 is directly locked by the locking portion may be adopted, or a box shape with or without a lid may be adopted.
  • a method of providing an accommodating portion and attaching by accommodating may be adopted.
  • the number of at least one of various bearings, screws, and buttons may be increased or decreased.
  • the electric motor side pulley 91 and the output shaft side pulley 114 may be gears that do not require the belt 122. At least one of various screws may be a pin.
  • the battery 8 may be rechargeable in the sander 1 to which the battery 8 is attached.
  • the single-use battery 8 may be adopted.
  • the number of the constricted portions 36 of the housing 2 may be three or more.
  • the present invention may be applied to a sander other than the orbital sander in which the pad 14 orbitally rotates, or another portable polishing machine such as a grinder or a polisher.

Abstract

The present invention improves the efficiency of cooling a controller in a motor of a portable grinding machine.　This portable grinding machine has a pad 14, an electric motor 4 that drives the pad 14, a controller 6 that controls the electric motor 4, a first fan 12 that cools the electric motor 4, and a second fan 16 that cools the controller 6.

Description

携帯用研磨機Portable polishing machine
　本発明は、携帯用のサンダ、グラインダ、ポリッシャ等の携帯用研磨機に関する。 The present invention relates to a portable polishing machine such as a portable sander, a grinder, and a polisher.
　特開２０１３－１８８８０４号公報（特許文献１）に示されるバッテリ装着型の携帯用のサンダでは、下端部にパッドが取り付けられる出力軸の中央部にファンが固定され、ファンの回転によりハウジング内において上側から下方への風が起きてモータが冷却される。
　サンダのモータは、ブラシ付きのモータである。コントローラは、ハウジング内の最上部において後下がりの姿勢で配置されている。ここで、コントローラは自然冷却され、積極的に冷却されていない。 In the battery-mounted portable sander disclosed in Japanese Unexamined Patent Publication No. 2013-188804 (Patent Document 1), the fan is fixed to the central portion of the output shaft where the pad is attached to the lower end, and the fan rotates to allow the fan to rotate inside the housing. Wind is generated from the upper side to the lower side to cool the motor.
Thunder's motor is a brushed motor. The controller is arranged in a rearward-down posture at the top of the housing. Here, the controller is naturally cooled and not actively cooled.
　特開２０１５－２１３９９１号公報（特許文献２）に示される電源コード接続型のランダムオービットサンダでは、吸気口が開いたリアカバー内であってブラシ付きモータの後側に配置されたコントローラが、モータの前側においてモータ軸に固定された遠心ファンの回転により起きた風によって、モータと共に冷却される。 In the power cord connection type random orbit sander disclosed in Japanese Patent Laid-Open No. 2005-213991 (Patent Document 2), a controller arranged in the rear cover with the intake port open and behind the brushed motor is The air is cooled together with the motor by the wind generated by the rotation of the centrifugal fan fixed to the motor shaft on the front side.
　特許文献１のサンダは、コントローラを自然冷却するものである。そのため、積極的に冷却することで、冷却効率に向上の余地がある。
　特許文献２のランダムオービットサンダは、コントローラをモータと共に一つの遠心ファンで冷却するものである。そのため、冷却効率に向上の余地がある。 The sander of Patent Document 1 is for naturally cooling the controller. Therefore, there is room for improvement in cooling efficiency by actively cooling.
The random orbit sander of patent document 2 cools a controller with a motor with one centrifugal fan. Therefore, there is room for improvement in cooling efficiency.
　本発明は、携帯用研磨機のモータのコントローラの冷却効率を高めることを目的とする。 The present invention aims to increase the cooling efficiency of the controller of the motor of a portable polishing machine.
　本発明の携帯用研磨機は、
　パッドと、
　前記パッドを駆動する電動モータと、
　前記電動モータを制御するコントローラと、
　前記電動モータを冷却する第１ファンと、
　前記コントローラを冷却する第２ファンと、
　を有する。 The portable polishing machine of the present invention is
Pad,
An electric motor for driving the pad,
A controller for controlling the electric motor,
A first fan for cooling the electric motor;
A second fan for cooling the controller,
Have.
　本発明の携帯用研磨機によれば、モータのコントローラの冷却効率を高めることができる。 According to the portable polishing machine of the present invention, the cooling efficiency of the motor controller can be increased.
実施形態のサンダの斜視図Perspective view of the sander of the embodiment 図１のサンダの右側面図Right side view of Thunder in Figure 1 図１のサンダの左側面図Left side view of Thunder in Figure 1 図１のサンダの上面図Top view of the Thunder in Figure 1 図１のサンダの左右方向中央の縦断面図Vertical sectional view of the center of the sander in FIG. 1 in the left-right direction 図１のサンダの前後方向中央の横断面図Cross-sectional view of the center of the sander in FIG. 図２のＡ－Ａ線断面図Sectional view taken along the line AA of FIG.
　以下、本発明の実施形態及び変更例を、適宜図面に基づいて説明する。尚、本発明は、以下の実施形態及び変更例に限定されない。 Hereinafter, embodiments and modifications of the present invention will be described with reference to the drawings as appropriate. The present invention is not limited to the following embodiments and modifications.
＜実施形態＞
　図１は、実施形態の携帯用研磨機の斜視図である。携帯用研磨機は、例えば、携帯用のサンダ１である。図２は、サンダ１の右側面図である。図３は、サンダ１の左側面図である。図４は、サンダ１の上面図である。図５は、サンダ１の左右方向中央の縦断面図（バッテリ８は右側面図）である。図６は、サンダ１の前後方向中央の横断面図である。図７は、図２のＡ－Ａ線断面図である。 <Embodiment>
FIG. 1 is a perspective view of a portable polishing machine according to an embodiment. The portable polishing machine is, for example, a portable sander 1. FIG. 2 is a right side view of the sander 1. FIG. 3 is a left side view of the sander 1. FIG. 4 is a top view of the sander 1. FIG. 5 is a vertical cross-sectional view of the center of the sander 1 in the left-right direction (the battery 8 is a right side view). FIG. 6 is a transverse sectional view of the center of the sander 1 in the front-rear direction. FIG. 7 is a sectional view taken along the line AA of FIG.
　サンダ１は、ハウジング２と、電動モータ４と、コントローラ６と、スイッチ７と、バッテリ８と、出力軸１０と、第１ファン１２と、パッド１４と、第２ファン１６と、集塵ノズル１８とを有する。ハウジング２は、各種の部材を直接あるいは間接的に保持する。電動モータ４は、駆動源である。コントローラ６は、電動モータ４を制御する。スイッチ７は、コントローラ６に電気的に接続される。バッテリ８は、電動モータ４に対する電力供給源である。第１ファン１２は、出力軸１０の下端縁に設けられる。パッド１４は、出力軸１０の下側に設けられる。第２ファン１６は、電動モータ４の上部に設けられる。集塵ノズル１８は、虫眼鏡枠状であり、ハウジング２の下端部に取り付けられる。 The sander 1 includes a housing 2, an electric motor 4, a controller 6, a switch 7, a battery 8, an output shaft 10, a first fan 12, a pad 14, a second fan 16, and a dust collection nozzle 18. Have and. The housing 2 holds various members directly or indirectly. The electric motor 4 is a drive source. The controller 6 controls the electric motor 4. The switch 7 is electrically connected to the controller 6. The battery 8 is a power supply source for the electric motor 4. The first fan 12 is provided on the lower edge of the output shaft 10. The pad 14 is provided below the output shaft 10. The second fan 16 is provided above the electric motor 4. The dust collection nozzle 18 has a magnifying glass frame shape and is attached to the lower end of the housing 2.
　ハウジング２は、左ハウジング２Ｌと右ハウジング２Ｒとを有する半割のものである。左ハウジング２Ｌには、複数のネジボス２０（図５）が形成される。右ハウジング２Ｒには、ネジボス２０に対応するネジ孔２２が形成される。対応するネジボス２０及びネジ孔２２にネジ２４が通されて、ハウジング２が形成される。 The housing 2 is a half housing having a left housing 2L and a right housing 2R. A plurality of screw bosses 20 (Fig. 5) are formed on the left housing 2L. A screw hole 22 corresponding to the screw boss 20 is formed in the right housing 2R. A screw 24 is passed through the corresponding screw boss 20 and screw hole 22 to form the housing 2.
　ハウジング２の上部２ａ（第１の把持部）は、ユーザの片方の手で握ることができる。サンダ１は、上部２ａにおいて操作可能なパーム型である。
　上部２ａの前端部には、スイッチ７の前面が露出する。スイッチ７は、前面に、停止ボタン２６と、起動速度切替ボタン２８とを有する。停止ボタン２６と、起動速度切替ボタン２８とは、左右方向に並ぶ。尚、停止ボタン２６と、起動速度切替ボタン２８とは、上下方向等に並んでも良い。又、起動停止ボタンと速度切替ボタン等、異なる役割のボタンを有しても良いし、３個以上のボタンを有しても良い。また、速度切替ダイヤル等のボタン以外のスイッチ切替部が設けられても良い。 The upper portion 2a (first grip portion) of the housing 2 can be gripped by one hand of the user. The sander 1 is a palm type that can be operated on the upper portion 2a.
The front surface of the switch 7 is exposed at the front end of the upper portion 2a. The switch 7 has a stop button 26 and a startup speed switching button 28 on the front surface. The stop button 26 and the activation speed switching button 28 are arranged side by side in the left-right direction. The stop button 26 and the activation speed switching button 28 may be arranged side by side in the vertical direction or the like. Further, buttons having different roles such as a start / stop button and a speed switching button may be provided, or three or more buttons may be provided. Further, a switch switching unit other than the buttons such as the speed switching dial may be provided.
　ハウジング２の前端部であって、スイッチ７の下方には、膨出部３０が形成される。膨出部３０は、周囲の部分に対して前方へ膨出する。尚、膨出部３０は、前部の側部等の前端部以外に設けられても良いし、複数設けられても良いし、省略されても良い。 A bulge 30 is formed at the front end of the housing 2 and below the switch 7. The bulging portion 30 bulges forward with respect to the surrounding portion. The bulging portion 30 may be provided at a portion other than the front end portion such as a side portion of the front portion, a plurality of bulging portions 30 may be provided, or may be omitted.
　ハウジング２は後端部に、バッテリ取付部３２を有する。バッテリ取付部３２には、バッテリ８が取り付けられる。バッテリ取付部３２には、取り付けられたバッテリ８と電気的につながるターミナル３４（図５）が配置される。バッテリ取付部３２の上方からバッテリ８をスライドさせ、バッテリボタン８ａとつながるバッテリ爪８ｂ（図５）がバッテリ取付部３２に掛かるようにすることで、バッテリ８が取り付けられる。バッテリボタン８ａを後方へスライドさせた後、バッテリ８を上方へスライドさせることで、バッテリ８が取り外される。バッテリ８は前下がりに取り付けられ、バッテリ８の上端部がハウジング２の上部２ａの上面と揃う。
　バッテリ８は、充電器により充電可能な充電池である。サンダ１は、充電式サンダである。 The housing 2 has a battery mounting portion 32 at the rear end. The battery 8 is attached to the battery attachment portion 32. In the battery mounting portion 32, a terminal 34 (FIG. 5) electrically connected to the mounted battery 8 is arranged. The battery 8 is attached by sliding the battery 8 from above the battery attaching portion 32 so that the battery claw 8b (FIG. 5) connected to the battery button 8a is hooked on the battery attaching portion 32. The battery 8 is removed by sliding the battery button 8a rearward and then sliding the battery 8 upward. The battery 8 is attached to the front lower side, and the upper end portion of the battery 8 is aligned with the upper surface of the upper portion 2a of the housing 2.
The battery 8 is a rechargeable battery that can be charged by a charger. Thunder 1 is a rechargeable thunder.
　ハウジング２の上部２ａは、両側方に膨出する。ハウジング２の下部において、突出部２ｂが両側方に突出する。上部２ａと突出部２ｂの間のサンダ１の両側部には、括れ部３６が設けられる。 The upper part 2a of the housing 2 bulges out to both sides. In the lower part of the housing 2, the protrusions 2b protrude to both sides. A constricted portion 36 is provided on both sides of the sander 1 between the upper portion 2a and the protruding portion 2b.
　各括れ部３６は、左右互いに同様であるため、主に一方の括れ部３６について説明する。括れ部３６は、後方へ行く程内側へ深くなる。括れ部３６は、全体的には、滑らかな曲面で形成される。括れ部３６の後側には、バッテリ取付部３２が配置され、側方に突出する。括れ部３６の後端縁から前端までの外寸は、一般ユーザの手の親指以外の指（特に中指）の先から掌中央までの寸法である。左右の括れ部（第２の把持部）３６は、ユーザが前方から把持可能である。
　括れ部３６の後端縁から前端までの外寸は、一般ユーザの手の親指以外の指（特に中指）の先から掌中央までの寸法である。よって、括れ部３６の後端縁は、バッテリ８を装着したサンダ１全体の重心の上方より奥（バッテリ取付部３２に近い側）に位置する。尚、比較的に重量の嵩む電動モータ４とバッテリ８につき出力軸１０を挟んで互いに逆側に対向させたため、重心は、出力軸１０付近に位置する。 Since each constricted portion 36 is similar to each other on the left and right, one constricted portion 36 will be mainly described. The constricted portion 36 becomes deeper inward as it goes backward. The constricted portion 36 is formed of a smooth curved surface as a whole. The battery mounting portion 32 is arranged on the rear side of the constricted portion 36 and projects sideward. The outer dimension from the rear edge to the front edge of the constricted portion 36 is the dimension from the tip of a finger (especially the middle finger) other than the thumb of the general user's hand to the center of the palm. The left and right constricted portions (second grip portions) 36 can be gripped by the user from the front.
The outer dimension from the rear edge to the front edge of the constricted portion 36 is the dimension from the tip of a finger (especially the middle finger) other than the thumb of the general user's hand to the center of the palm. Therefore, the rear end edge of the constricted portion 36 is located deeper (above the battery mounting portion 32) than above the center of gravity of the entire sander 1 in which the battery 8 is mounted. Since the electric motor 4 and the battery 8 which are relatively heavy are opposed to each other with the output shaft 10 interposed therebetween, the center of gravity is located near the output shaft 10.
　括れ部３６の上部には、窪み部３７が形成される。窪み部３７は、窪み部３７の下側に対して更に窪んでいる。窪み部３７は、前後方向（水平方向）に長く形成され、前後方向の長さがユーザの指（特に人差指）の長さ程度である。窪み部３７は、指の厚みの半分程の深さを有し、指の幅と同程度の幅を有する。 A depression 37 is formed on the constriction 36. The recess 37 is further recessed with respect to the lower side of the recess 37. The recess 37 is formed to be long in the front-rear direction (horizontal direction), and the length in the front-rear direction is about the length of the user's finger (particularly the index finger). The recessed portion 37 has a depth that is about half the thickness of the finger, and has a width that is similar to the width of the finger.
　窪み部３７には、側方に突出する複数（３個）の突起３８が設けられる。複数の突起３８は、互いに同様の形状である。各突起３８は、前方へ尖るＶ字状である。各突起３８は、前後方向に等間隔に並び、ユーザの指（特に人差指）の中央あるいは全体をカバーする。 The recess 37 is provided with a plurality of (three) protrusions 38 protruding laterally. The plurality of protrusions 38 have the same shape as each other. Each protrusion 38 has a V-shape that is pointed forward. The protrusions 38 are arranged at equal intervals in the front-rear direction and cover the center or the whole of the user's finger (particularly the index finger).
　各括れ部３６の後端縁には、凹部３９が形成される。凹部３９は、周囲に対し更に深い。凹部３９は、上下方向に沿うように長く、前から括れ部３６に手を添えると、凹部３９には一般ユーザの中指と薬指の各指先が位置する。
　窪み部３７の上端から凹部３９の下端までの高さは、一般ユーザの人差指から小指までの幅と同程度である。 A recess 39 is formed at the rear end edge of each constricted portion 36. The recess 39 is deeper than the surroundings. The concave portion 39 is long along the vertical direction, and when the constricted portion 36 is touched from the front, the fingertips of the middle finger and the ring finger of the general user are located in the concave portion 39.
The height from the upper end of the recess 37 to the lower end of the recess 39 is about the same as the width from the index finger to the little finger of a general user.
　右の括れ部３６の上端部であって、右の窪み部３７の後端部であり、右ハウジング２Ｒの上部２ａの下側には、無線通信アダプタ挿入部４０が形成される。無線通信アダプタ挿入部４０は、周囲に対し左方へ箱状に凹む。
　無線通信アダプタ挿入部４０には、無線通信アダプタ４１を差し込み可能である。無線通信アダプタ挿入部４０に無線通信アダプタ４１を差し込むと、無線通信アダプタ４１は、コントローラ６に搭載された無線通信用コントローラ（図示略）と電気的に接続される。 A wireless communication adapter insertion portion 40 is formed at the upper end of the right constricted portion 36 and at the rear end of the right recess 37, and below the upper portion 2a of the right housing 2R. The wireless communication adapter insertion part 40 is recessed in a box shape to the left with respect to the surroundings.
A wireless communication adapter 41 can be inserted into the wireless communication adapter insertion section 40. When the wireless communication adapter 41 is inserted into the wireless communication adapter insertion section 40, the wireless communication adapter 41 is electrically connected to a wireless communication controller (not shown) mounted on the controller 6.
　無線通信アダプタ４１は、付帯設備としての集塵機（図示略）との間で無線通信を行う。無線通信によって、集塵機の起動動作、停止動作が、サンダ１の起動動作、停止動作と連動する。
　予め、無線通信アダプタ４１と、集塵機に取り付けられた集塵機側無線通信アダプタとの間において、無線通信を可能にするための関連付け（ペアリング）が行われる。ペアリングは、ユーザが、集塵機側無線通信アダプタのボタンを押し、所定時間内に無線通信アダプタ４１のボタン４１ａを操作することでなされる。 The wireless communication adapter 41 performs wireless communication with a dust collector (not shown) as an auxiliary equipment. The start and stop operations of the dust collector are linked to the start and stop operations of the sander 1 by wireless communication.
In advance, association (pairing) for enabling wireless communication is performed between the wireless communication adapter 41 and the dust collector-side wireless communication adapter attached to the dust collector. The pairing is performed by the user pressing the button of the dust collector-side wireless communication adapter and operating the button 41a of the wireless communication adapter 41 within a predetermined time.
　尚、ハウジング２の形状は、半割でないものでもよい。ハウジング２は、インナーハウジングを有してもよい。一方の括れ部３６のみに窪み部３７、突起３８及び凹部３９の少なくとも一方が配置されたり、括れ部３６が左右の一方のみ配置されてもよい。把持部が１箇所あるいは３箇所以上に配置されてもよい。無線通信アダプタ挿入部４０は、省略されても良い。 The shape of the housing 2 may not be half. The housing 2 may have an inner housing. At least one of the recess 37, the protrusion 38, and the recess 39 may be arranged only in the one constricted portion 36, or the constricted portion 36 may be arranged in only one of the left and right sides. The grips may be arranged at one place or at three or more places. The wireless communication adapter insertion unit 40 may be omitted.
　ハウジング２下部の各突出部２ｂには、複数の第１排気口４２が形成される。各第１排気口４２は、前後方向に延びる。複数の第１排気口４２は、前後方向に並ぶ。
　各括れ部３６の前部中央であって、各窪み部３７の下側には、複数の第１吸気口４４が形成される。各第１吸気口４４は、上下方向に延びる。複数の第１吸気口４４は、前後方向に並ぶ。 A plurality of first exhaust ports 42 are formed in each of the protrusions 2b at the bottom of the housing 2. Each first exhaust port 42 extends in the front-rear direction. The plurality of first exhaust ports 42 are arranged in the front-rear direction.
A plurality of first intake ports 44 are formed at the front center of each constricted portion 36 and below each recess 37. Each first intake port 44 extends in the vertical direction. The plurality of first intake ports 44 are arranged in the front-rear direction.
　左右の各第１吸気口４４上側であって、各窪み部３７の下部には、複数の第２排気口４６が形成される。各第２排気口４６は、上下方向に延びる。複数の第２排気口４６は、前後方向に並ぶ。
　ハウジング２の上部２ａの左右端縁には、複数の第２吸気口４８が形成される。各第２吸気口４８は、上下方向に延びる。複数の第２吸気口４８は、前後方向に並ぶ。 A plurality of second exhaust ports 46 are formed above the respective left and right first intake ports 44 and below each recess 37. Each second exhaust port 46 extends in the vertical direction. The plurality of second exhaust ports 46 are arranged in the front-rear direction.
A plurality of second intake ports 48 are formed on the left and right edges of the upper portion 2a of the housing 2. Each second intake port 48 extends in the vertical direction. The plurality of second intake ports 48 are arranged in the front-rear direction.
　各括れ部３６の前下部には、左右方向に延びる第３吸気口４９が形成される。
　ハウジング２の下端部であって、各突出部２ｂの下側には、複数の集塵排気口（図示略）が形成される。各集塵排気口は、左右方向に延びる。複数の集塵排気口は、前後及び上下に並ぶ。 A third intake port 49 extending in the left-right direction is formed in the lower front portion of each constricted portion 36.
A plurality of dust collection exhaust ports (not shown) are formed at the lower end of the housing 2 and below each of the protrusions 2b. Each dust collection exhaust port extends in the left-right direction. The plurality of dust collection exhaust ports are arranged side by side in the front and rear and in the top and bottom.
　尚、これら各種の排気口及び吸気口の少なくとも一つは、数が増減されても良い。また、例えば、左右の一方のみに設けられたり、非対称位置に設けられたりするように配置が変更されても良い。また、延びる方向及び長さ並びに外形等といった形状及び大きさの少なくとも一方が変更されても良い。 Note that the number of at least one of these various exhaust ports and intake ports may be increased or decreased. Further, for example, the arrangement may be changed so that it is provided on only one of the left and right sides or is provided at an asymmetrical position. Further, at least one of the shape and the size such as the extending direction and the length and the outer shape may be changed.
　電動モータ４は、ＤＣ駆動のブラシレスモータである。電動モータ４は、円筒状のステータ５０の径方向内方にロータ５２が配置されるインナーロータ型である。コントローラ６が比較的に発熱し易いブラシレスモータにおいて、電動モータ４及びコントローラ６が十分に冷却される。尚、電動モータ４は、ＡＣ駆動のブラシレスモータでも良いし、ステータ５０の径方向外方にロータ５２が配置されるアウターロータ型でも良いし、ブラシ付き等のブラシレスモータ以外のものでも良い。 The electric motor 4 is a DC-driven brushless motor. The electric motor 4 is an inner rotor type in which a rotor 52 is arranged radially inward of a cylindrical stator 50. In the brushless motor in which the controller 6 relatively easily generates heat, the electric motor 4 and the controller 6 are sufficiently cooled. The electric motor 4 may be an AC-driven brushless motor, an outer rotor type in which a rotor 52 is arranged radially outside the stator 50, or a brushless motor other than a brush type motor.
　ステータ５０は、固定子鉄心６０と、第１絶縁部材６２と、第２絶縁部材６４と、複数のコイル６６と、モータ端子６８と、を有する。第１絶縁部材６２は、固定子鉄心６０の上側に配置される。第２絶縁部材６４は、固定子鉄心６０の下側に配置される。複数（６個）のコイル６６は、第１絶縁部材６２及び第２絶縁部材６４を介して、固定子鉄心６０に巻かれる。モータ端子６８は、複数のコイル６６に対して、所定の結線態様で電気的に接続される。 The stator 50 has a stator core 60, a first insulating member 62, a second insulating member 64, a plurality of coils 66, and a motor terminal 68. The first insulating member 62 is arranged above the stator core 60. The second insulating member 64 is arranged below the stator core 60. A plurality of (six) coils 66 are wound around the stator core 60 via the first insulating member 62 and the second insulating member 64. The motor terminal 68 is electrically connected to the plurality of coils 66 in a predetermined wiring manner.
　モータ端子６８は、第２絶縁部材６４の前部から前方に突出する。モータ端子６８は、複数本の第１リード線７０（図５において１本のみ図示）によって、コントローラ６と接続される。モータ端子６８及び第１リード線７０の下部は、膨出部３０内に配置される。
　第２絶縁部材６４には、センサ基板７２が取り付けられる。センサ基板７２には、ロータ５２の回転位置を磁気により検出する複数の回転位置センサ（図示略）が搭載される。 The motor terminal 68 projects forward from the front portion of the second insulating member 64. The motor terminal 68 is connected to the controller 6 by a plurality of first lead wires 70 (only one is shown in FIG. 5). Lower portions of the motor terminal 68 and the first lead wire 70 are arranged in the bulging portion 30.
The sensor substrate 72 is attached to the second insulating member 64. A plurality of rotational position sensors (not shown) that magnetically detect the rotational position of the rotor 52 are mounted on the sensor substrate 72.
　ロータ５２は、電動モータ軸８０と、回転子鉄心８２と、複数の永久磁石８４と、複数の回転位置センサ用永久磁石と、スリーブ８６と、を有する。電動モータ軸８０は、円柱状であり、上下に延びる。回転子鉄心８２は、円筒状であり、電動モータ軸８０の中央部に固定される。複数（４個）の永久磁石８４は、板状であり、回転子鉄心８２の曲面内側において周方向に極性を交互に変えた状態で並ぶように埋め込まれる。複数の回転位置センサ用永久磁石（不図示）は、電動モータ軸８０、回転子鉄心８２、複数の永久磁石８４の下側（センサ基板７２側）において、放射状に配置される。スリーブ８６は、水平板状であり、電動モータ軸８０、回転子鉄心８２、複数の永久磁石８４の上側に配置される。 The rotor 52 includes an electric motor shaft 80, a rotor core 82, a plurality of permanent magnets 84, a plurality of permanent magnets for rotational position sensors, and a sleeve 86. The electric motor shaft 80 has a columnar shape and extends vertically. The rotor core 82 has a cylindrical shape and is fixed to the central portion of the electric motor shaft 80. The plurality (four) of permanent magnets 84 are plate-shaped and are embedded inside the curved surface of the rotor core 82 so as to be arranged in a state in which the polarities are alternately changed in the circumferential direction. The plurality of rotational position sensor permanent magnets (not shown) are arranged radially below the electric motor shaft 80, the rotor core 82, and the plurality of permanent magnets 84 (on the sensor substrate 72 side). The sleeve 86 has a horizontal plate shape and is arranged above the electric motor shaft 80, the rotor core 82, and the plurality of permanent magnets 84.
　スリーブ８６の上側であって、電動モータ軸８０の上部に、第２ファン１６が固定される。よって、第２ファン１６は、パッド１４を駆動する電動モータ４によって効率的に駆動される。第２ファン１６は、遠心ファンである。尚、第２ファン１６は、電動モータ４の構成要素としてもよい。又、第２ファン１６は、軸流ファン等の他のタイプのファンでも良い。
　第２ファン１６は、サンダ１の上側から鉛直下方への視点（上面視）において、コントローラ６と一部が重なる。即ち、第２ファン１６の後部の上方に、コントローラ６の前部が位置する。よって、コントローラ６が効率良く冷却され、サンダ１が前後方向あるいは左右方向にコンパクトになる。尚、上面視で、第２ファン１６の全部が、コントローラ６と重なっても良い。又、第２ファン１６の下方にコントローラ６が配置されても良い。 The second fan 16 is fixed to the upper side of the sleeve 86 and above the electric motor shaft 80. Therefore, the second fan 16 is efficiently driven by the electric motor 4 that drives the pad 14. The second fan 16 is a centrifugal fan. The second fan 16 may be a component of the electric motor 4. The second fan 16 may be another type of fan such as an axial fan.
The second fan 16 partially overlaps the controller 6 from the viewpoint (top view) of the sander 1 from the upper side to the lower side in the vertical direction. That is, the front portion of the controller 6 is located above the rear portion of the second fan 16. Therefore, the controller 6 is efficiently cooled, and the sander 1 becomes compact in the front-rear direction or the left-right direction. Note that the second fan 16 may entirely overlap the controller 6 in a top view. Further, the controller 6 may be arranged below the second fan 16.
　第２ファン１６の上側には、第１電動モータ軸受８８が配置されている。第１電動モータ軸受８８は、電動モータ軸８０を回転可能に支持する。電動モータ軸８０の下部には、第２電動モータ軸受９０が配置される。第２電動モータ軸受９０は、電動モータ軸８０を回転可能に支持する。
　電動モータ軸８０の下端部には、電動モータ側プーリ９１が固定される。 The first electric motor bearing 88 is arranged above the second fan 16. The first electric motor bearing 88 rotatably supports the electric motor shaft 80. A second electric motor bearing 90 is arranged below the electric motor shaft 80. The second electric motor bearing 90 rotatably supports the electric motor shaft 80.
An electric motor-side pulley 91 is fixed to the lower end of the electric motor shaft 80.
　電動モータ４は、リブ９２Ａ～９２Ｆにより、ハウジング２内の前部中央に保持される。リブ９２Ａ～９２Ｆは、左ハウジング２Ｌ及び右ハウジング２Ｒの内面から内方へ突出する。電動モータ４は、出力軸１０に対して、バッテリ８と反対側に配置される。 The electric motor 4 is held in the front center of the housing 2 by the ribs 92A to 92F. The ribs 92A to 92F project inward from the inner surfaces of the left housing 2L and the right housing 2R. The electric motor 4 is arranged on the side opposite to the battery 8 with respect to the output shaft 10.
　最上方の一対のリブ９２Ａには、第１電動モータ軸受８８が保持される。
　リブ９２Ａと、リブ９２Ａの下側のリブ９２Ｂとの間に、第２ファン１６が配置される。リブ９２Ａには、通気のための複数の通気孔９２ｈ（図５）が形成される。第２ファン１６の外方であって、リブ９２Ｂの上側には、各第２排気口４６が位置する。リブ９２Ｂの前端部は、上方に延び、第２ファン１６の前方を覆う。リブ９２Ｂの中央部には、電動モータ軸８０を通す孔が形成される。
　リブ９２Ｂの下側のリブ９２Ｃ及びリブ９２Ｄは、ステータ５０を保持する。
　更に下側のリブ９２Ｅ及びリブ９２Ｆは、前後左右に広がる板状のモータブラケット９４を介して、第２電動モータ軸受９０を保持する。
　リブ９２Ｆの下方に、電動モータ側プーリ９１が配置される。 The first electric motor bearing 88 is held by the uppermost pair of ribs 92A.
The second fan 16 is arranged between the rib 92A and the rib 92B below the rib 92A. A plurality of ventilation holes 92h (FIG. 5) for ventilation are formed in the rib 92A. The second exhaust ports 46 are located outside the second fan 16 and above the ribs 92B. The front end of the rib 92B extends upward and covers the front of the second fan 16. A hole for passing the electric motor shaft 80 is formed in the center of the rib 92B.
The ribs 92C and 92D below the ribs 92B hold the stator 50.
Further, the ribs 92E and 92F on the lower side hold the second electric motor bearing 90 via a plate-shaped motor bracket 94 that spreads in the front, rear, left, and right directions.
The electric motor side pulley 91 is arranged below the rib 92F.
　コントローラ６は、制御回路基板を有する。コントローラ６は、ハウジング２の上部２ａ内の前後に形成されたリブ９８によって、水平姿勢で保持される。
　コントローラ６（制御回路基板）には、複数（６個）のスイッチング素子（図示略）と、コンデンサ９９とが搭載される。複数のスイッチング素子は、モータ１１の回転を行う。電動モータ４は、ブラシレスモータである。ブラシレスモータは、ブラシ付きモータと同様の出力を確保しながら、より一層コンパクトである。そのため、コンデンサ９９が電動モータ４の隣接箇所（上流）に配置可能となり、サンダ１がコンパクトになる。また、コンデンサ９９が十分に冷却される。 The controller 6 has a control circuit board. The controller 6 is held in a horizontal posture by ribs 98 formed at the front and rear of the upper portion 2a of the housing 2.
A plurality of (six) switching elements (not shown) and a capacitor 99 are mounted on the controller 6 (control circuit board). The plurality of switching elements rotate the motor 11. The electric motor 4 is a brushless motor. Brushless motors are much more compact while ensuring the same output as brushed motors. Therefore, the capacitor 99 can be arranged at a location (upstream) adjacent to the electric motor 4, and the sander 1 becomes compact. Further, the condenser 99 is sufficiently cooled.
　コントローラ６は、複数の第２リード線１００（１本のみ図５に図示）により、バッテリ取付部３２のターミナル３４と電気的に接続される。
　スイッチ７がオンとなっている場合、コントローラ６は、センサ基板７２の回転位置センサにより把握されたロータ５２の回転位置に応じ、スイッチング素子により各コイル６６に対する電力供給のスイッチングを行い、ロータ５２を回転させる。 The controller 6 is electrically connected to the terminal 34 of the battery mounting portion 32 by a plurality of second lead wires 100 (only one is shown in FIG. 5).
When the switch 7 is turned on, the controller 6 switches the power supply to each coil 66 by the switching element in accordance with the rotational position of the rotor 52 grasped by the rotational position sensor of the sensor substrate 72, and turns the rotor 52 on. Rotate.
　スイッチ７は、オフの状態で起動速度切替ボタン２８への押下を１度受けると、高速モードでオンに切り替わる。スイッチ７は、更に起動速度切替ボタン２８への押下を１度受けると、中速モードでオンに切り替わる。スイッチ７は、更に起動速度切替ボタン２８への押下を１度受けると、低速モードでオンに切り替わる。スイッチ７は、更に起動速度切替ボタン２８への押下を１度受けると、高速モードに切り替わる。スイッチ７は、何れのモードにおいても、停止ボタン２６への押下を受けると、オフに切り替わる。
　コントローラ６は、スイッチ７がオンとなっている場合、モードの種類に応じた速度でロータ５２を回転させる。
　尚、他のモードが設けられても良いし、速度切替が省略されても良い。 The switch 7 is switched on in the high-speed mode when the activation speed switching button 28 is pressed once in the off state. When the switch 7 is further pressed once, the switch 7 is turned on in the medium speed mode. When the switch 7 is further pressed once, the switch 7 is turned on in the low speed mode. The switch 7 is switched to the high speed mode when the activation speed switching button 28 is further pressed once. In any mode, the switch 7 is turned off when the stop button 26 is pressed.
When the switch 7 is turned on, the controller 6 rotates the rotor 52 at a speed according to the type of mode.
Other modes may be provided and speed switching may be omitted.
　出力軸１０は、円柱状であり、上下に延びる。出力軸１０は、ハウジング２内の中央部において、その中心軸周りで回転自在に保持される。
　出力軸１０の上端部には、第１出力軸受１１０が配置される。第１出力軸受１１０は、出力軸１０を回転可能に支持する。
　出力軸１０の下部には、第２出力軸受１１２が配置される。第２出力軸受１１２は、出力軸１０を回転可能に支持する。
　出力軸１０の下部であって、第２出力軸受１１２の下側には、出力軸側プーリ１１４が固定される。
　出力軸１０の下端部には、第１ファン１２が固定される。 The output shaft 10 has a cylindrical shape and extends vertically. The output shaft 10 is rotatably held around its central axis in the central portion of the housing 2.
A first output bearing 110 is arranged at the upper end of the output shaft 10. The first output bearing 110 rotatably supports the output shaft 10.
A second output bearing 112 is arranged below the output shaft 10. The second output bearing 112 rotatably supports the output shaft 10.
An output shaft side pulley 114 is fixed to the lower part of the output shaft 10 and below the second output bearing 112.
The first fan 12 is fixed to the lower end of the output shaft 10.
　第１出力軸受１１０は、第１出力軸受保持部１２０に保持される。第１出力軸受保持部１２０は、下開放箱状であり、左ハウジング２Ｌ及び右ハウジング２Ｒの内面から内方へ突出する。第１出力軸受保持部１２０の前面部は、リブ９２Ａの後端部とリブ９２Ｂの後端部とをつなぎ、第２ファン１６の後方を覆う。第１出力軸受保持部１２０の上面部は、無線通信アダプタ挿入部４０の下面部と一体化している。第１出力軸受保持部１２０の後下部から、出力軸１０の後側に配置される後リブ１２１（図５）が延びる。後リブ１２１は、下方及び後方に延びる側面視“Ｌ”字状である。後リブ１２１は、後下端部において、ターミナル３４の下部を保持する。
　第２出力軸受１１２は、モータブラケット９４の後部に保持される。モータブラケット９４は、前部において第２電動モータ軸受９０を保持する。
　モータブラケット９４の下側に、出力軸側プーリ１１４が配置される。 The first output bearing 110 is held by the first output bearing holder 120. The first output bearing holding portion 120 has a lower open box shape and projects inward from the inner surfaces of the left housing 2L and the right housing 2R. The front surface portion of the first output bearing holding portion 120 connects the rear end portion of the rib 92A and the rear end portion of the rib 92B and covers the rear side of the second fan 16. The upper surface portion of the first output bearing holding portion 120 is integrated with the lower surface portion of the wireless communication adapter insertion portion 40. A rear rib 121 (FIG. 5) arranged on the rear side of the output shaft 10 extends from the lower rear portion of the first output bearing holding portion 120. The rear rib 121 has a side view “L” shape extending downward and rearward. The rear rib 121 holds the lower portion of the terminal 34 at the rear lower end portion.
The second output bearing 112 is held on the rear portion of the motor bracket 94. The motor bracket 94 holds the second electric motor bearing 90 at the front part.
The output shaft side pulley 114 is arranged below the motor bracket 94.
　出力軸側プーリ１１４と電動モータ側プーリ９１とには、ベルト１２２が掛けられる。
　電動モータ側プーリ９１の径は、出力軸側プーリ１１４の径より小さい。電動モータ軸８０の回転は、出力軸側プーリ１１４、電動モータ側プーリ９１及びベルト１２２（減速機構）により、減速されて、出力軸１０へ伝達される。 A belt 122 is wound around the output shaft side pulley 114 and the electric motor side pulley 91.
The diameter of the electric motor side pulley 91 is smaller than the diameter of the output shaft side pulley 114. The rotation of the electric motor shaft 80 is decelerated by the output shaft side pulley 114, the electric motor side pulley 91 and the belt 122 (reduction mechanism), and is transmitted to the output shaft 10.
　第１ファン１２は、水平な円盤状の部材であって、上部に、複数の第１羽根部１２ａと、肉厚部１２ｂとを有する。第１羽根部１２ａは、中央から周縁へ湾曲放射状に延び、上方に突出する。肉厚部１２ｂは、周縁の一部において、幾つかの第１羽根部１２ａの外側先端部が結合して形成される。
　同様に、第１ファン１２は、下部に、複数の第２羽根部１２ｃと、肉厚部１２ｄとを有する。第２羽根部１２ｃは、中央から周縁へ湾曲放射状に延び、下方に突出する。肉厚部１２ｄは、周縁の一部において、肉厚部１２ｂと点対称の位置に形成される。
　第１ファン１２が回転すると、各第１羽根部１２ａにより径方向外方への風が起き、各第２羽根部１２ｃにより径方向外方への風が起きる。 The first fan 12 is a horizontal disk-shaped member, and has a plurality of first blade portions 12a and a thick portion 12b in the upper portion. The first blade portion 12a extends in a curved radial shape from the center to the peripheral edge and projects upward. The thick portion 12b is formed by joining the outer tip portions of some of the first blade portions 12a at a part of the peripheral edge.
Similarly, the first fan 12 has a plurality of second blade portions 12c and a thick portion 12d in the lower portion. The second blade portion 12c extends in a curved radial shape from the center to the peripheral edge and projects downward. The thick portion 12d is formed in a position symmetrical with respect to the thick portion 12b in a part of the peripheral edge.
When the first fan 12 rotates, each first blade portion 12a produces a radially outward wind, and each second blade portion 12c produces a radially outward wind.
　各第１羽根部１２ａの径方向外方に、各第１排気口４２が位置する。
　ハウジング２の下端部は、下方へ開放される。ハウジング２の下端部内であって各突出部２ｂの下側に、各第２羽根部１２ｃが位置する。
　集塵排気口を有するハウジング２の下端部（各突出部２ｂの下側）の径方向外側に、集塵ノズル１８が取り付けられる。集塵ノズル１８のリング状部１８ａには、蝶番１８ｂが設けられる。ユーザは、蝶番１８ｂにおいて集塵ノズル１８を開いて、ハウジング２の下端部に対し閉じ、リング状部１８ａと柄状部１８ｃとの間に設けられたネジ孔部にネジ１８ｄを通すことにより、集塵ノズル１８をハウジング２の下端部に取り付ける。リング状部１８ａは、半筒状である。リング状部１８ａは、取付によりハウジング２の下端部を覆う。柄状部１８ｃは、閉じられると筒状となる。柄状部１８ｃは、集塵ノズル１８の取付時、図示のように後方に突出させる他、他の方向に突出させてもよい。 The first exhaust ports 42 are located radially outward of the first blade portions 12a.
The lower end of the housing 2 is opened downward. Each second blade portion 12c is located in the lower end portion of the housing 2 and below each protruding portion 2b.
A dust collection nozzle 18 is attached to the outside in the radial direction of the lower end of the housing 2 having a dust collection exhaust port (the lower side of each protrusion 2b). A hinge 18b is provided on the ring-shaped portion 18a of the dust collection nozzle 18. The user opens the dust collecting nozzle 18 at the hinge 18b, closes the lower end of the housing 2, and inserts the screw 18d into the screw hole provided between the ring-shaped portion 18a and the handle-shaped portion 18c. The dust collecting nozzle 18 is attached to the lower end of the housing 2. The ring-shaped portion 18a has a semi-cylindrical shape. The ring-shaped portion 18a covers the lower end portion of the housing 2 by mounting. The handle 18c has a tubular shape when closed. When the dust collecting nozzle 18 is attached, the handle 18c may be projected rearward as shown, or may be projected in another direction.
　集塵ノズル１８（柄状部１８ｃ）には、集塵口を有する袋状のダストバッグ（不図示）、あるいは集塵機（不図示）が接続される。無線通信アダプタ４１とペアリングされた集塵機が接続された場合、スイッチ７によりサンダ１が起動すると、起動を示す起動情報が無線通信アダプタ４１から集塵機に送信される。そして、集塵機側無線通信アダプタが起動情報を受信し、集塵機が自動的に起動する。無線通信状態は、無線通信アダプタ４１に設けられたランプ４１ｂの点灯状態によって、ユーザに知らされる。スイッチ７により起動中のサンダ１が停止すると、停止を示す停止情報が無線通信アダプタ４１から集塵機に送信される。そして、集塵機側無線通信アダプタが停止情報を受信し、集塵機が自動的に停止する。即ち、無線通信アダプタ４１により、サンダ１のオンオフと集塵機のオンオフとが連動する。 A bag-shaped dust bag (not shown) having a dust collection port or a dust collector (not shown) is connected to the dust collection nozzle 18 (handle 18c). When the dust collector that is paired with the wireless communication adapter 41 is connected and the sander 1 is activated by the switch 7, activation information indicating activation is transmitted from the wireless communication adapter 41 to the dust collector. Then, the dust collector-side wireless communication adapter receives the activation information, and the dust collector is automatically activated. The wireless communication state is notified to the user by the lighting state of the lamp 41b provided on the wireless communication adapter 41. When the activated sander 1 is stopped by the switch 7, stop information indicating the stop is transmitted from the wireless communication adapter 41 to the dust collector. Then, the dust collector-side wireless communication adapter receives the stop information, and the dust collector automatically stops. That is, the wireless communication adapter 41 links the ON / OFF of the sander 1 with the ON / OFF of the dust collector.
　パッド１４は、出力軸１０の先端に取り付けられる。パッド１４の下面には、面ファスナ等を介して、先端工具の一例である研磨用のサンディングディスク（不図示）が取り付けられる。尚、先端工具として、スポンジパッド、フェルトパッド、あるいはウールパッドが取り付けられても良い。又、パッド１４は先端工具と一体化されても良い。 The pad 14 is attached to the tip of the output shaft 10. A sanding disk (not shown) for polishing, which is an example of a tip tool, is attached to the lower surface of the pad 14 via a surface fastener or the like. A sponge pad, a felt pad, or a wool pad may be attached as the tip tool. Further, the pad 14 may be integrated with the tip tool.
　パッド１４は、パッド本体１３０と、パッド軸受具１３２を有する。パッド軸受具１３２は、パッド本体１３０の上側に配置される。パッド軸受具１３２は、ボールベアリング１３４と、内側ベアリングリテーナ（フラットワッシャ）１３６と、外側ベアリングリテーナ１３８を有する。内側ベアリングリテーナ１３６は、ボールベアリング１３４の内筒に固定される。外側ベアリングリテーナ１３８をは、ボールベアリング１３４の外筒に固定される。 The pad 14 has a pad body 130 and a pad bearing member 132. The pad bearing member 132 is arranged above the pad body 130. The pad bearing device 132 includes a ball bearing 134, an inner bearing retainer (flat washer) 136, and an outer bearing retainer 138. The inner bearing retainer 136 is fixed to the inner cylinder of the ball bearing 134. The outer bearing retainer 138 is fixed to the outer cylinder of the ball bearing 134.
　内側ベアリングリテーナ１３６におけるボールベアリング１３４の回転軸線から偏心した位置には、出力軸１０の先端部に入る内側ネジ１４０を通す孔が形成される。内側ベアリングリテーナ１３６は、ボールベアリング１３４の内筒下側に配置され、ボールベアリング１３４を下方から支持する。ボールベアリング１３４の内筒内部には、第１ファン１２中央の下側突出部１２ｅが入れられ、下側突出部１２ｅにも出力軸１０が通される。下側突出部１２ｅは、出力軸１０に対して偏心している。
　外側ベアリングリテーナ１３８とパッド本体１３０をつなぐ外側ネジ１４２を通すための孔が、外側ベアリングリテーナ１３８とパッド本体１３０の双方に形成されている。 A hole is formed in the inner bearing retainer 136 at a position eccentric from the rotation axis of the ball bearing 134 to allow the inner screw 140 to be inserted into the tip portion of the output shaft 10. The inner bearing retainer 136 is disposed below the inner cylinder of the ball bearing 134 and supports the ball bearing 134 from below. A lower protruding portion 12e of the center of the first fan 12 is inserted inside the inner cylinder of the ball bearing 134, and the output shaft 10 is also passed through the lower protruding portion 12e. The lower protrusion 12e is eccentric to the output shaft 10.
Holes are formed in both the outer bearing retainer 138 and the pad body 130 for passing the outer screws 142 that connect the outer bearing retainer 138 and the pad body 130.
　第１ファン１２の肉厚部１２ｂ，１２ｄは、パッド１４の偏心状態を考慮して、上述の位置にウェイト（錘）として配置される。これにより、肉厚部１２ｂ，１２ｄは、パッド１４のボールベアリング１３４等による回転及び偏心回転（オービタル回転）を調節するカウンターウェイトの役割を担う。 The thick- walled portions 12b and 12d of the first fan 12 are arranged as weights (weights) at the above positions in consideration of the eccentric state of the pad 14. As a result, the thick portions 12b and 12d serve as counterweights for adjusting the rotation and eccentric rotation (orbital rotation) of the pad 14 by the ball bearings 134 and the like.
　サンダ１は、例えば、次のように動作する。
　動作停止（オフ）状態において、ユーザがバッテリ８をバッテリ取付部３２に装着してスイッチ７をオンにする。すると、コントローラ６がバッテリ８の電力を電動モータ４へ供給し、電動モータ軸８０が所定の速度で回転する。 The sander 1 operates as follows, for example.
In the operation stopped (off) state, the user attaches the battery 8 to the battery mounting portion 32 and turns on the switch 7. Then, the controller 6 supplies the electric power of the battery 8 to the electric motor 4, and the electric motor shaft 80 rotates at a predetermined speed.
　電動モータ軸８０は、これに固定された電動モータ側プーリ９１、並びにベルト１２２及び出力軸側プーリ１１４を介して、出力軸１０を回転駆動する。
　出力軸１０の回転により、パッド１４が次のように偏心回転する。即ち、出力軸１０を中心に、ボールベアリング１３４及び外側ベアリングリテーナ１３８を介して、パッド本体１３０が回転する（公転）。サンダ１の作業時には、ボールベアリング１３４の内筒、ボール、外筒の間に相互に力が加わることによって転動抵抗が発生し、パッド１４がボールベアリング１３４を中心に、公転と同一方向に回転する（自転）。尚、無負荷回転の時には、ボールベアリング１３４内の摩擦抵抗が不安定な状態なので、不規則な自転をしたり、自転しなかったりする。 The electric motor shaft 80 rotationally drives the output shaft 10 via the electric motor side pulley 91 fixed to the electric motor shaft 80, the belt 122 and the output shaft side pulley 114.
The rotation of the output shaft 10 causes the pad 14 to eccentrically rotate as follows. That is, the pad body 130 rotates (revolves) around the output shaft 10 via the ball bearing 134 and the outer bearing retainer 138. During the operation of the sander 1, rolling resistance is generated due to mutual force being exerted between the inner cylinder, the ball, and the outer cylinder of the ball bearing 134, and the pad 14 rotates about the ball bearing 134 in the same direction as the revolution. Do (rotate). During no-load rotation, since the frictional resistance inside the ball bearing 134 is unstable, it may or may not rotate irregularly.
　ユーザは、このように回転されるパッド１４を、ハウジング２の上部２ａ及び左右の括れ部３６の少なくとも一方を把持して、ワークに対し押し付けつつ移動させる。これにより、サンディングペーパー等を介して、ワークの表面に研磨等を施すことができる。
　ユーザが左右の括れ部３６を前方から掴む場合、双方の括れ部３６の間に形成される膨出部３０により、膨出部３０が手のひらの中央を支持可能となる。そのため、第２の把持部は膨出部３０がない場合に比べて、より握り易いものとなる。 The user grips at least one of the upper portion 2a of the housing 2 and the left and right constricted portions 36 and moves the pad 14 thus rotated while pressing the pad 14 against the work. Thereby, the surface of the work can be polished or the like through the sanding paper or the like.
When the user grips the left and right constricted portions 36 from the front, the bulged portions 30 formed between the both constricted portions 36 enable the bulged portion 30 to support the center of the palm. Therefore, the second grip portion is easier to grip than the case without the bulging portion 30.
　電動モータ軸８０の回転により第２ファン１６が回転し、出力軸１０の回転により第１ファン１２が回転する。
　回転する第１ファン１２の各第１羽根部１２ａにより、各第１排気口４２からエアが排気される。この排気により各第１吸気口４４及び各第３吸気口４９からエアが流入し、図５に示されるような、各第１吸気口４４から各第１排気口４２への風Ｗ１が発生する。風Ｗ１は、電動モータ４の外側、及びステータ５０とロータ５２との間（電動モータ４内部）を通り、電動モータ４を冷却する。一対のリブ９２Ｂ（隔壁）は、各第１吸気口４４の上側に配置される。そのため、各第１排気口４２からの排気によって、リブ９２Ｂを挟んで反対側にある各第２吸気口４８等からエアが流入し各第１吸気口４４から各第１排気口４２への風Ｗ１に合流することが防止される。 The rotation of the electric motor shaft 80 rotates the second fan 16, and the rotation of the output shaft 10 rotates the first fan 12.
Air is exhausted from each first exhaust port 42 by each first blade portion 12a of the rotating first fan 12. Due to this exhaust, air flows in from each first intake port 44 and each third intake port 49, and a wind W1 from each first intake port 44 to each first exhaust port 42 is generated as shown in FIG. .. The wind W1 cools the electric motor 4 by passing outside the electric motor 4 and between the stator 50 and the rotor 52 (inside the electric motor 4). The pair of ribs 92B (partition walls) are arranged above each first intake port 44. Therefore, due to the exhaust from each first exhaust port 42, air flows in from each second intake port 48 and the like on the opposite side across the rib 92B, and the wind from each first intake port 44 to each first exhaust port 42. Merging with W1 is prevented.
　回転する第１ファン１２の各第２羽根部１２ｃにより、各集塵用排気口からエアが排気される。この排気によりパッド１４周辺の粉塵を含み得るエアが吸引され、パッド１４周辺から各集塵用排気口への風ＷＤが発生する。各集塵用排気口からの排気は、集塵ノズル１８のリング状部１８ａから柄状部１８ｃへ流れ、ダストバッグあるいは集塵機に至る。 Air is exhausted from each dust collection exhaust port by each second blade portion 12c of the rotating first fan 12. By this exhaust, air that may contain dust around the pad 14 is sucked, and wind WD from the periphery of the pad 14 to each dust collecting exhaust port is generated. The exhaust air from each dust collecting exhaust port flows from the ring-shaped portion 18a of the dust collecting nozzle 18 to the handle portion 18c, and reaches the dust bag or the dust collector.
　回転する第２ファン１６により、各第２排気口４６からエアが排気される。この排気により各第２吸気口４８からエアが流入し、各第２吸気口４８から各第２排気口４６への風Ｗ２が発生する。風Ｗ２は、第２ファン１６の上流に配置されたコントローラ６（制御回路基板）の周囲を通り、コントローラ６を冷却する。又、風Ｗ２は、リブ９２Ａの通気孔９２ｈを通って、第２ファン１６に至る。リブ９２Ｂは、各第２排気口４６の下側に配置される。そのため、各第２排気口４６からの排気によって、リブ９２Ｂを挟んで反対側にある各第１吸気口４４等からエアが流入し各第２吸気口４８から各第２排気口４６への風Ｗ２に合流することが防止される。 Air is exhausted from each second exhaust port 46 by the rotating second fan 16. Due to this exhaust, air flows in from each second intake port 48, and wind W2 from each second intake port 48 to each second exhaust port 46 is generated. The wind W2 passes around the controller 6 (control circuit board) arranged upstream of the second fan 16 and cools the controller 6. Further, the wind W2 reaches the second fan 16 through the ventilation hole 92h of the rib 92A. The rib 92B is arranged below each second exhaust port 46. Therefore, by the exhaust air from each second exhaust port 46, air flows in from each first intake port 44 and the like on the opposite side with the rib 92B interposed therebetween, and the wind from each second intake port 48 to each second exhaust port 46. Merging with W2 is prevented.
　即ち、第１ファン１２（各第１羽根部１２ａ）により電動モータ４が冷却され、第２ファン１６によりコントローラ６が冷却される。第１ファン１２と第２ファン１６との間に配置された隔壁としてのリブ９２Ｂにより、電動モータ４及び第１ファン１２が配置される第１区画（下部）と、コントローラ６及び第２ファン１６が配置される第２区画（上部）とが確定される。より詳しくは、リブ９２Ｂと、第１出力軸受保持部１２０と、後リブ１２１とにより、ハウジング２内部の上部と下部とが分けられる。よって、第１ファン１２の風Ｗ１と第２ファン１６の風Ｗ２とは混じり難く、第１ファン１２の風Ｗ１が電動モータ４を冷却し、第２ファン１６の風Ｗ２がコントローラ６を冷却する。電動モータ４を冷却する第１ファン１２の風Ｗ１が第１区画を通り、コントローラ６を冷却する第２ファン１６の風Ｗ２が第２区画を通る。風Ｗ１，Ｗ２はリブ９２Ｂにより隔てられ、他方を妨げることなく独立して流れて、コントローラ６又は電動モータ４を効率良く冷却する。 That is, the electric motor 4 is cooled by the first fan 12 (each first blade portion 12a), and the controller 6 is cooled by the second fan 16. By the rib 92B as a partition wall arranged between the first fan 12 and the second fan 16, a first section (lower part) in which the electric motor 4 and the first fan 12 are arranged, the controller 6 and the second fan 16 are formed. The second section (upper part) in which is arranged is determined. More specifically, the rib 92B, the first output bearing holding portion 120, and the rear rib 121 separate the upper portion and the lower portion inside the housing 2. Therefore, the wind W1 of the first fan 12 and the wind W2 of the second fan 16 are hard to mix, the wind W1 of the first fan 12 cools the electric motor 4, and the wind W2 of the second fan 16 cools the controller 6. .. The wind W1 of the first fan 12 that cools the electric motor 4 passes through the first section, and the wind W2 of the second fan 16 that cools the controller 6 passes through the second section. The winds W1 and W2 are separated by the ribs 92B and independently flow without obstructing the other to cool the controller 6 or the electric motor 4 efficiently.
　尚、本発明は上記形態及び上記変更例に限定されず、更に次のような変更例を適宜有するものである。
　第２ファン１６は、コントローラ６に加えて、電動モータ４等の他の部材を冷却しても良い。第１ファン１２についても、第２ファン１６と同様である。
　ハウジング２の隔壁は、左ハウジング２Ｌ及び右ハウジング２Ｒとは別体で、これらの少なくとも一方の内面に立てられるものであっても良いし、又、内部に別の区画としての空洞を有しても良い。
　第１ファン１２は、各部分の形状及び数の少なくとも一方が変更されても良いし、羽根部の一部に肉厚部（バランス部）の機能が付与されても良いし、肉厚部が省略されても良い。
　パッド１４は、ボールベアリング１３４の内筒内に第１ファン１２の中央下部が入らないように、出力軸１０に直接固定されても良い。 It should be noted that the present invention is not limited to the above-described embodiment and the above-described modified examples, and further has the following modified examples as appropriate.
The second fan 16 may cool other members such as the electric motor 4 in addition to the controller 6. The first fan 12 is similar to the second fan 16.
The partition wall of the housing 2 may be a separate body from the left housing 2L and the right housing 2R, and may be erected on the inner surface of at least one of them, or may have a cavity as another compartment inside. Is also good.
At least one of the shape and the number of each part of the first fan 12 may be changed, a function of a thick part (balance part) may be imparted to a part of the blade part, and the thick part may have a thick part. It may be omitted.
The pad 14 may be directly fixed to the output shaft 10 so that the lower central portion of the first fan 12 does not enter the inner cylinder of the ball bearing 134.
　バッテリ８の装着態様につき、バッテリ取付部３２に案内されるスライド取付方式に代えて、直接係止部に係止させるダイレクト取付方式が採用されても良いし、蓋付きあるいは蓋なしの箱形の収容部を設けて、収容により取り付ける方式が採用されても良い。
　各種軸受及びネジ、ボタンのうちの少なくとも何れかの数が増減されてもよい。電動モータ側プーリ９１及び出力軸側プーリ１１４がベルト１２２を要しないギヤとされてもよい。各種のネジの少なくとも何れかがピンとされてもよい。バッテリ８を取り付けたサンダ１においてバッテリ８が充電可能とされてもよい。使い切りのバッテリ８が採用されてもよい。ハウジング２の括れ部３６の数が３箇所以上とされてもよい。このように、各種部材の機能、配置、種類、数、形式の少なくとも何れかが適宜変更されても良い。又、本発明は、パッド１４がオービタル回転するオービタルサンダ以外の他のサンダ、あるいはグラインダ、ポリッシャ等の他の携帯用研磨機に適用されても良い。 Regarding the mounting mode of the battery 8, instead of the slide mounting method guided by the battery mounting portion 32, a direct mounting method in which the battery 8 is directly locked by the locking portion may be adopted, or a box shape with or without a lid may be adopted. A method of providing an accommodating portion and attaching by accommodating may be adopted.
The number of at least one of various bearings, screws, and buttons may be increased or decreased. The electric motor side pulley 91 and the output shaft side pulley 114 may be gears that do not require the belt 122. At least one of various screws may be a pin. The battery 8 may be rechargeable in the sander 1 to which the battery 8 is attached. The single-use battery 8 may be adopted. The number of the constricted portions 36 of the housing 2 may be three or more. In this way, at least one of the function, arrangement, type, number, and format of various members may be changed as appropriate. Further, the present invention may be applied to a sander other than the orbital sander in which the pad 14 orbitally rotates, or another portable polishing machine such as a grinder or a polisher.
　１・・サンダ（携帯用研磨機）
　２・・ハウジング
　４・・電動モータ
　６・・コントローラ
１２・・第１ファン
１４・・パッド
１６・・第２ファン
３０・・膨出部
８０・・電動モータ軸
９２Ｂ・・リブ（隔壁）
９９・・コンデンサ
Ｗ１・・電動モータ４冷却用の風
Ｗ２・・コントローラ６冷却用の風 1 ... Sanda (portable polishing machine)
2 ・ ・ Housing 4 ・ ・ Electric motor 6 ・ ・ Controller 12 ・ ・ First fan 14 ・ ・ Pad 16 ・ ・ Second fan 30 ・ ・ Bulging part 80 ・ ・ Electric motor shaft 92B ・ ・ Rib (partition)
99 .. Condenser W1 .. Wind for cooling electric motor 4 W2 .. Wind for controller 6 cooling

Claims (8)

  1. 　パッドと、
    　前記パッドを駆動する電動モータと、
    　前記電動モータを制御するコントローラと、
    　前記電動モータを冷却する第１ファンと、
    　前記コントローラを冷却する第２ファンと、
    　を有する携帯用研磨機。     Pad,
    An electric motor for driving the pad,
    A controller for controlling the electric motor,
    A first fan for cooling the electric motor;
    A second fan for cooling the controller,
    Portable polishing machine having.
  2. 　前記電動モータ及び前記第１ファンが配置される第１区画と、前記コントローラ及び前記第２ファンが配置される第２区画とを区切る隔壁を有するハウジングを更に有する、
    　請求項１に記載の携帯用研磨機。     The housing further includes a partition wall that partitions a first compartment in which the electric motor and the first fan are arranged and a second compartment in which the controller and the second fan are arranged.
    The portable polishing machine according to claim 1.
  3. 　前記電動モータは、電動モータ軸を有し、
    　前記第２ファンは、前記電動モータ軸に設けられる、
    　請求項１又は２に記載の携帯用研磨機。     The electric motor has an electric motor shaft,
    The second fan is provided on the electric motor shaft,
    The portable polishing machine according to claim 1 or 2.
  4. 　上面視で、前記第２ファンの少なくとも一部は、前記コントローラと重なる、
    　請求項１～３のいずれかに記載の携帯用研磨機。     At least a part of the second fan overlaps with the controller in a top view,
    The portable polishing machine according to any one of claims 1 to 3.
  5. 　前記電動モータは、ブラシレスモータである、
    　請求項１～４のいずれかに記載の携帯用研磨機。     The electric motor is a brushless motor,
    The portable polishing machine according to any one of claims 1 to 4.
  6. 　前部において外方に膨出する膨出部を有するハウジングを更に有する、
    　請求項１～５のいずれかに記載の携帯用研磨機。     Further comprising a housing having a bulging portion that bulges outward at a front portion,
    The portable polishing machine according to any one of claims 1 to 5.
  7. 　前記コントローラは、コンデンサを有し、
    　前記コンデンサは、前記第２ファンの上流側に配置される、
    　請求項１～６のいずれかに記載の携帯用研磨機。     The controller has a capacitor,
    The condenser is disposed upstream of the second fan,
    The portable polishing machine according to any one of claims 1 to 6.
  8. 　前記ハウジングは、
    　　前記第１ファンの径方向外方に位置する第１排気口と、
    　　前記第２ファンの径方向外方に位置する第２排気口と、を有する、
    　請求項２～７のいずれかに記載の携帯用研磨機。
          The housing is
    A first exhaust port located radially outward of the first fan;
    A second exhaust port located radially outward of the second fan,
    The portable polishing machine according to any one of claims 2 to 7.
PCT/JP2019/036782 2018-11-15 2019-09-19 Portable grinding machine WO2020100423A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018214471A JP7262209B2 (en) 2018-11-15 2018-11-15 portable polishing machine
JP2018-214471 2018-11-15

Publications (1)

Publication Number Publication Date
WO2020100423A1 true WO2020100423A1 (en) 2020-05-22

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ID=70730678

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Application Number Title Priority Date Filing Date
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Country Link
JP (1) JP7262209B2 (en)
WO (1) WO2020100423A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220072676A1 (en) * 2020-09-04 2022-03-10 X'pole Precision Tools Inc. Electric grinding machine tool
TWI802391B (en) * 2022-04-29 2023-05-11 鼎朋企業股份有限公司 grinding machine

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JP5190774B2 (en) * 2008-05-29 2013-04-24 日立工機株式会社 Electric tool
JP2013188804A (en) * 2012-03-12 2013-09-26 Makita Corp Sander
JP2018103318A (en) * 2016-12-27 2018-07-05 日立工機株式会社 Electric tool

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JP2002144210A (en) 2000-11-02 2002-05-21 Makita Corp Sander
JP2006255808A (en) 2005-03-15 2006-09-28 Hitachi Koki Co Ltd Power tool with dust collection function
JP6316649B2 (en) 2014-05-09 2018-04-25 株式会社マキタ Electric tool

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Publication number Priority date Publication date Assignee Title
JP5190774B2 (en) * 2008-05-29 2013-04-24 日立工機株式会社 Electric tool
JP2013188804A (en) * 2012-03-12 2013-09-26 Makita Corp Sander
JP2018103318A (en) * 2016-12-27 2018-07-05 日立工機株式会社 Electric tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220072676A1 (en) * 2020-09-04 2022-03-10 X'pole Precision Tools Inc. Electric grinding machine tool
TWI802391B (en) * 2022-04-29 2023-05-11 鼎朋企業股份有限公司 grinding machine

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JP7262209B2 (en) 2023-04-21

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