WO2022070765A1 - Engin de chantier - Google Patents

Engin de chantier Download PDF

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Publication number
WO2022070765A1
WO2022070765A1 PCT/JP2021/032424 JP2021032424W WO2022070765A1 WO 2022070765 A1 WO2022070765 A1 WO 2022070765A1 JP 2021032424 W JP2021032424 W JP 2021032424W WO 2022070765 A1 WO2022070765 A1 WO 2022070765A1
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WO
WIPO (PCT)
Prior art keywords
cooling air
space
motor
fan
housing
Prior art date
Application number
PCT/JP2021/032424
Other languages
English (en)
Japanese (ja)
Inventor
領祐 仲野
賢 伊縫
智翔 曹
Original Assignee
工機ホールディングス株式会社
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 工機ホールディングス株式会社 filed Critical 工機ホールディングス株式会社
Priority to JP2022553711A priority Critical patent/JPWO2022070765A1/ja
Publication of WO2022070765A1 publication Critical patent/WO2022070765A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D49/00—Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws
    • B23D49/10—Hand-held or hand-operated sawing devices with straight saw blades
    • B23D49/14—Pad saws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D49/00—Machines or devices for sawing with straight reciprocating saw blades, e.g. hacksaws
    • B23D49/10—Hand-held or hand-operated sawing devices with straight saw blades
    • B23D49/16—Hand-held or hand-operated sawing devices with straight saw blades actuated by electric or magnetic power or prime movers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • 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

Definitions

  • the present invention relates to a working machine.
  • a fan that rotates by driving a motor is provided, and a control unit for controlling the driving of the motor is arranged on the side of the fan. Has been done.
  • the cooling air generated by the rotation of the fan flows to the control unit, and the heat generating member (cooled unit) such as the FET mounted on the motor or the control unit can be cooled by the cooling air. can.
  • an object of the present invention is to provide a working machine capable of improving the cooling performance of a cooled portion (heat generating member).
  • One or more embodiments of the present invention include a housing having an intake port and an exhaust port, a motor housed in the housing, and a motor housed in the housing, which is rotated by the drive of the motor and rotated inside the housing. It includes a fan that generates cooling air, a portion that is housed in the housing and generates heat during operation, and is cooled by the cooling air, and the cooling air is sucked into the inside of the housing from the intake port.
  • the upstream cooling air that flows into the fan and the downstream cooling air that flows out of the fan and is exhausted from the exhaust port to the outside of the housing are included, and the cooled portion is described as described above. It is a working machine that is cooled by the upstream cooling air and the downstream cooling air.
  • the housing has a first space through which the upstream cooling air passes and a second space through which the downstream cooling air passes. It is a working machine in which the cooling unit is exposed in the first space and the second space.
  • One or more embodiments of the present invention is a working machine in which the housing is composed of a plurality of divided housings, and the divided housing is formed with a holding portion for sandwiching the cooled portion. ..
  • the housing has a rectifying unit that partitions the first space and the second space and rectifies the upstream cooling air to guide it to the second space side.
  • the rectifying portion is a working machine in which an exposed portion for exposing a part of the cooled portion to the second space is formed.
  • the fan is arranged in the second space, and a guide hole communicating the first space and the second space is formed in the rectifying section.
  • This is a working machine in which the fan and the guide hole are arranged so as to face each other in the axial direction of the fan.
  • the cooled unit is a working machine that is a control unit that controls the motor.
  • control unit includes a control board connected to the motor and a box-shaped case containing the control board and having one side open in the thickness direction. It is a working machine that is configured to cool the bottom wall of the case with the cooling air.
  • control unit is arranged in the first space, and the intake port is arranged on the other side of the case in the thickness direction with respect to the bottom wall of the case. It is a working machine.
  • One or more embodiments of the present invention is a working machine in which the control unit partitions the first space and the second space.
  • One or more embodiments of the present invention is a working machine in which the bottom wall of the case is exposed to the first space and the opening of the case is opened to the second space side.
  • One or more embodiments of the present invention is a working machine in which a part of the cooled portion is arranged radially outside the fan, and the fan is configured as a centrifugal fan.
  • One or more embodiments of the present invention is a working machine in which the cooled portion is the motor.
  • One or more embodiments of the present invention include a housing having an intake port and an exhaust port, a motor housed in the housing, and inside the housing, which is housed in the housing and rotated by the drive of the motor. It includes a fan that generates cooling air, a cooled portion that is housed in the housing and generates heat during operation, and is cooled by the cooling air, and the cooled portion includes air before cooling the motor. , A working machine that is cooled by both air after cooling the motor.
  • the cooled portion is a working machine that is cooled by air after cooling the motor blown from the fan.
  • the cooling performance for the cooled portion can be improved.
  • FIG. 3 is a perspective view seen from diagonally left front, showing a state in which the control unit is sandwiched by the rear housing shown in FIG. 1.
  • FIG. 3 is an exploded perspective view of the rear housing and the control unit shown in FIG.
  • FIG. 3 is a rear view which shows the motor housing part in the rear housing shown in FIG. 1 and seen from the rear side.
  • sectional drawing (6-6 line sectional drawing of FIG. 5) seen from the left side which shows the assembly state of the split housing and the control part on the left side shown in FIG.
  • the saver saw 10 as a working machine according to the present embodiment will be described with reference to the drawings.
  • the arrows UP, FR, and RH appropriately shown in the drawings indicate the upper side, the front side, and the right side of the saver saw 10, respectively.
  • the vertical, front-back, and left-right directions of the saver saw 10 will be indicated unless otherwise specified.
  • the saver saw 10 is configured as a tool for cutting a work material such as a pipe.
  • the saver saw 10 includes a housing 12 constituting the outer shell of the saver saw 10, a motor 40 housed inside the housing 12, and a drive mechanism 50.
  • the saver saw 10 has a control unit 60 as a unit to be cooled for controlling the motor 40.
  • a cooling structure S is applied around the control unit 60, and the control unit 60 is cooled by the cooling structure S.
  • the housing 12 is formed in a hollow shape and is formed in a laterally substantially P-shape when viewed from the side.
  • the housing 12 includes a rear housing 13 constituting the rear portion of the housing 12 and a front housing 14 constituting the front portion of the housing 12.
  • the rear housing 13 is configured as a housing portion for accommodating the motor 40 described later
  • the front housing 14 is configured as a housing portion accommodating the drive mechanism 50 described later.
  • the front housing 14 has a resin front cover 14A, and a metal upper cover 14B and an undercover 14C located inside the front cover 14A. By assembling the upper cover 14B and the under cover 14C in the vertical direction, a space for accommodating the drive mechanism 50 is defined. The operator can perform the work while grasping the front portion (region having a small diameter) of the front cover 14A.
  • the rear housing 13 is composed of a pair of divided housings 15 divided into two in the left-right direction, and the rear housing 13 is formed by assembling the pair of divided housings 15 to each other (see FIG. 4).
  • the rear end portion of the rear housing 13 is configured as a handle portion 13A, and the handle portion 13A extends in the vertical direction.
  • a trigger 30 is provided on the upper end portion of the handle portion 13A so as to be pullable, and a switch mechanism portion 31 is provided on the rear side of the trigger portion 30.
  • the switch mechanism unit 31 has a switch (not shown) operated by the trigger 30, and the switch is electrically connected to a control unit 60 described later.
  • a battery pack 32 is detachably attached to the lower end of the rear end of the rear housing 13.
  • the battery pack 32 is electrically connected to a control unit 60 described later to supply electric power to a motor 40 described later.
  • a portion of the front portion of the rear housing 13 other than the upper end portion is configured as a motor housing portion 16 for accommodating a motor 40 described later.
  • the motor housing portion 16 is formed in a substantially bottomed cylinder shape that is open to the front side.
  • a fan guide 17 as a rectifying portion is provided in a portion on the front end side.
  • the fan guide 17 is formed in a plate shape with the front-rear direction as the plate thickness direction, and extends from the outer peripheral wall of the divided housing 15 toward the center side in the left-right direction of the saver saw 10.
  • the tip portions of the fan guides 17 formed in the split housing 15 are abutted against each other at the central portion in the left-right direction of the motor housing portion 16.
  • the inside of the motor housing portion 16 is divided back and forth by the fan guide 17. Specifically, the inside of the motor housing portion 16 is divided into a first space 16A constituting the rear portion of the motor housing portion 16 and a second space 16B constituting the front end portion of the motor housing portion 16 (). See FIG. 6).
  • a circular guide hole 17A is formed through the substantially central portion of the fan guide 17. As a result, the first space 16A and the second space 16B are communicated with each other by the guide hole 17A. Further, a front fixing portion 17B for fixing the control portion 60, which will be described later, is formed at the lower end portion of the fan guide 17.
  • the front fixing portion 17B is formed in a substantially concave shape that protrudes to the front side and is open to the rear side in a side view.
  • the upper wall of the front fixed portion 17B is configured as an inclined wall 17C that is inclined downward toward the front in a side view.
  • An exposed hole 17D as an exposed portion is formed through the inclined wall 17C in the central portion in the left-right direction, and the exposed hole 17D is abbreviated with the left-right direction as the longitudinal direction when viewed from the plate thickness direction of the inclined wall 17C. It is formed in a rectangular shape.
  • a first rear side fixing portion 18 (see FIG. 4) for fixing the control unit 60, which will be described later, is formed.
  • the first rear side fixing portion 18 is formed in a substantially U-shaped plate shape that is open to the front side in a side view, and extends from the right wall of the motor housing portion 16 to the center side in the left-right direction.
  • a second rear fixing portion 19 (see FIGS. 6 and 7) for fixing the control portion 60, which will be described later, is formed at the lower end portion of the left rear end portion of the motor housing portion 16.
  • the second rear fixing portion 19 is formed in a substantially L-shaped plate shape that is open to the front side and the upper side in a side view, and extends from the left wall of the motor housing portion 16 to the center side in the left-right direction.
  • a fixing piece 20 (see FIGS. 6 and 7) for fixing the control unit 60, which will be described later, is formed at the lower end of the left wall of the motor housing unit 16.
  • the fixed piece 20 is formed in a substantially rectangular plate shape with the vertical direction as the plate thickness direction, and extends from the left wall of the motor housing portion 16 to the center side in the left-right direction of the motor housing portion 16.
  • a pair of front and rear holding portions 21 (FIGS.
  • the holding portions 21 are the motor housing portions. It protrudes from the left and right side walls of the 16 toward the center side in the left-right direction of the motor housing portion 16 (in FIGS. 4 and 7, only the rear holding portion 21 is shown).
  • a plurality of (in this embodiment, eight locations) intake ports 22 are formed through the rear wall of the motor housing portion 16.
  • the intake port 22 is formed in an elongated hole shape with the left-right direction as the longitudinal direction.
  • the intake ports 22 arranged in the vertical direction form a pair, and the paired intake ports 22 are located at the upper and lower ends of the right and left portions of the rear wall of the motor housing portion 16, respectively.
  • the intake port 22 is arranged above the control unit 60 described later.
  • a foreign matter mixing prevention rib 22A protruding forward is formed on the lower edge portion of the intake port 22.
  • the foreign matter mixing prevention rib 22A extends in the left-right direction, and the front end portion of the foreign matter mixing prevention rib 22A is bent upward in a side view.
  • a plurality of (12 locations in the present embodiment) exhaust ports 23 are formed through the front end portion of the motor housing portion 16.
  • the exhaust port 23 is formed in a long hole shape with the circumferential direction of the motor housing portion 16 as the longitudinal direction.
  • the inside of the second space 16B and the outside of the motor housing portion 16 are communicated with each other by the exhaust port 23.
  • the exhaust ports 23 arranged in the front-rear direction form a pair, and the paired intake ports 22 are arranged side by side on the lower wall of the motor housing portion 16 in the left-right direction.
  • the paired exhaust ports 23 are arranged side by side in the vertical direction on the left and right side walls of the motor housing portion 16.
  • the motor 40 is housed in the first space 16A of the motor housing portion 16 of the housing 12.
  • the motor 40 includes a drive shaft 41, a rotor 42, a stator 43, and a motor substrate 45.
  • the drive shaft 41 is formed in a substantially columnar shape with the front-rear direction as the axial direction, and is arranged coaxially with the guide hole 17A.
  • the rear end portion of the drive shaft 41 is rotatably supported by the first bearing 33 fixed to the motor housing portion 16.
  • the drive shaft 41 is inserted through the guide hole 17A of the fan guide 17, and the front end portion of the drive shaft 41 is arranged in the front housing 14.
  • the front end side portion of the drive shaft 41 is rotatably supported by the second bearing 34 provided in the front housing 14.
  • a pinion gear 41A is formed on the outer peripheral portion of the front end portion of the drive shaft 41.
  • the rotor 42 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is configured to be integrally rotatable with the drive shaft 41 on the radial outer side of the drive shaft 41.
  • the stator 43 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is arranged on the outer side in the radial direction of the rotor 42.
  • the stator holder 44 of the stator 43 is sandwiched and held in the left-right direction by the motor holding ribs 24 (see FIGS. 4, 6, and 7) formed on the left and right side walls of the motor housing portion 16.
  • the motor substrate 45 is formed in a substantially annular plate shape with the front-rear direction as the plate thickness direction, and is fixed to the stator holder 44 on the rear side of the rotor 42 and the stator 43. One end of a coil wound around the stator holder 44 is connected to the motor board 45.
  • the drive mechanism 50 is housed in the front housing 14 (the area defined by the upper cover 14B and the undercover 14C).
  • the drive mechanism 50 includes a bevel gear 51, a motion conversion pin 52, and a plunger 53.
  • the bevel gear 51 is rotatably provided on the front side of the drive shaft 41 of the motor 40 with the vertical direction as the axial direction, and is meshed with the pinion gear 41A of the motor 40.
  • the motion conversion pin 52 is formed in a columnar shape with the vertical direction as the axial direction, and is fixed to the bevel gear 51 at a position eccentric with respect to the rotation axis of the bevel gear 51. The upper end of the motion conversion pin 52 projects upward from the bevel gear 51.
  • the plunger 53 is formed in a substantially columnar shape with the front-rear direction as the axial direction.
  • the plunger 53 is supported by the front housing 14 on the upper side of the bevel gear 51 so as to be reciprocally movable in the front-rear direction.
  • a connecting portion 54 is formed in a portion on the rear end side of the plunger 53, and the connecting portion 54 is formed in a groove shape that is open downward and extends in the left-right direction. Then, the upper end portion of the motion conversion pin 52 is inserted into the connecting portion 54, and the bevel gear 51 and the plunger 53 are connected to each other. As a result, the motor 40 is driven and the bevel gear 51 is rotated, so that the plunger 53 is configured to reciprocate in the front-rear direction.
  • a blade holder 55 is provided at the front end of the plunger 53, and a blade 56 is attached to the blade holder 55.
  • the blade 56 is formed in a substantially long plate shape with the front-rear direction as the longitudinal direction and the left-right direction as the plate thickness direction. Then, the rear end portion of the blade 56 is attached to the blade holder 55, and the blade 56 is arranged on the front side of the front housing 14.
  • a blade portion 56A is formed at the lower end portion of the blade 56. As a result, the blade 56 reciprocates in the front-rear direction, so that the work material is cut by the blade 56.
  • the control unit 60 is housed in the lower end portion of the first space 16A of the motor housing unit 16.
  • the control unit 60 includes a control board 62 and a case 61 for accommodating the control board 62.
  • the case 61 is formed in a rectangular box shape having a relatively shallow bottom with the vertical direction as the thickness direction. Further, the case 61 is open to one side (lower side) in the thickness direction.
  • the case 61 is configured to include a bottom wall 61A constituting the upper end of the case 61 and a side wall 61B extending downward from the outer peripheral portion of the bottom wall 61A.
  • a case inclined portion 61C is formed at the upper end portion of the side wall 61B. The case inclined portion 61C is inclined inward of the case 61 toward the upper side and is connected to the bottom wall 61A.
  • the case 61 is sandwiched in the left-right direction by the split housing 15 of the rear housing 13 and fixed to the motor housing portion 16. Specifically, the left and right side walls 61B of the case 61 are sandwiched in the left-right direction by the left and right holding portions 21 of the motor housing portion 16. As a result, the movement of the case 61 in the left-right direction is restricted by the holding portion 21. Further, the front end portion of the case 61 is arranged inside the front side fixing portion 17B of the motor housing portion 16, and the rear end portion of the case 61 is arranged inside the first rear side fixing portion 18, and the first 2 It is arranged on the upper side of the lower wall of the rear fixing portion 19.
  • the fixing piece 20 of the motor housing portion 16 is arranged on the upper side of the left end portion of the bottom wall 61A of the case 61. As a result, the vertical movement of the case 61 is restricted by the front fixing portion 17B, the first rear fixing portion 18, the second rear fixing portion 19, and the fixing piece 20.
  • the case 61 is arranged apart from the lower side of the stator 43 of the motor 40, and is arranged below the intake port 22 of the motor housing portion 16.
  • a cooling air passage 70 (see FIGS. 7 and 9) is formed between the motor 40 and the case 61. That is, the bottom wall 61A of the case 61 is housed in the first space 16A of the motor housing portion 16 so as to form a part of the wall portion of the cooling air passage 70.
  • the opening 61D of the case 61 opens to the bottom wall 61A on the side opposite to the cooling air passage 70, the intake port 22, and the guide hole 17A. Further, the rear end portion of the cooling air passage 70 communicates with the intake port 22, and the front end portion of the cooling air passage 70 communicates with the guide hole 17A.
  • the control board 62 is formed in a substantially rectangular plate shape with the vertical direction as the plate thickness direction.
  • the control board 62 is housed in the case 61 and fixed to the case 61.
  • On the lower surface of the control board 62 a plurality of (six in the present embodiment) switching elements (FETs) 63 (in a broad sense, elements grasped as heat-generating components) are provided.
  • FETs switching elements
  • the saver saw 10 has a fan 72 that generates a cooling air AR that cools the control unit 60.
  • the fan 72 is integrally rotatably fixed to the front end side portion of the drive shaft 41 of the motor 40, and is arranged on the front side of the fan guide 17 and in the second space 16B of the motor housing portion 16. That is, most of the control unit 60 is arranged between the intake port 22 of the motor housing unit 16 and the fan 72, and a part of the control unit 60 is arranged between the fan 72 and the exhaust port 23 of the motor housing unit 16. (Front end) is arranged.
  • the fan 72 is configured as a centrifugal fan to generate an air flow that causes air on the rear side of the fan 72 to flow outward in the radial direction of the fan 72.
  • a cooling air AR that is sucked into the motor housing portion 16 from the intake port 22 and discharged to the outside of the motor housing portion 16 from the exhaust port 23 is generated inside the motor housing portion 16.
  • the cooling air AR is sucked into the first space 16A from the intake port 22 and is sucked into the second space 16B and flows into the fan 72, and the upstream cooling air AR1 and the second space 16B.
  • Includes the downstream cooling air AR2 which is discharged outward from the fan 72 in the radial direction and is exhausted to the outside of the motor housing portion 16 from the exhaust port 23. That is, the air flow from the intake port 22 to the fan 72 (suction air) is the upstream cooling air AR1, and the air flow from the fan 72 to the exhaust port 23 (exhaust air) is the downstream cooling air AR2.
  • the upstream cooling air AR1 sucked into the first space 16A from the intake port 22 passes through the cooling air passage 70 and goes to the guide hole 17A side along the rear surface of the fan guide 17. It is designed to flow. That is, the fan guide 17 is configured to function as a guide portion that guides the upstream cooling air AR1 flowing in the first space 16A to the fan 72.
  • the motor 40 is driven by the pulling operation of the trigger 30.
  • the driving force of the motor 40 is transmitted to the plunger 53 of the drive mechanism 50, and the plunger 53 reciprocates in the front-rear direction.
  • the blade 56 attached to the plunger 53 reciprocates in the front-rear direction together with the plunger 53. Therefore, the blade 56 that reciprocates can cut the work material such as a pipe.
  • the fan 72 rotates around the axis of the drive shaft 41 together with the drive shaft 41 of the motor 40, and the air on the rear side (motor 40 side) of the fan 72 flows outward in the radial direction of the fan 72.
  • An air flow is generated.
  • the upstream cooling air AR1 is sucked into the first space 16A from the intake port 22 of the motor housing portion 16.
  • the intake port 22 communicates with the rear end portion of the cooling air passage 70. Therefore, the upstream cooling air AR1 sucked into the upper part of the first space 16A hits the motor board 45 of the motor 40 and flows to the lower side (cooling air passage 70 side) along the rear surface of the motor board 45. It flows into the rear end side of the cooling air passage 70. Further, the upstream cooling air AR1 sucked into the lower part of the first space 16A directly flows into the rear end side of the cooling air passage 70.
  • the upstream cooling air AR1 flowing into the rear end of the cooling air passage 70 flows forward in the cooling air passage 70 along the upper surface of the bottom wall 61A in the case 61 of the control unit 60. That is, the upstream cooling air AR1 flows in the cooling air passage 70 while cooling the case 61.
  • the upstream cooling air AR1 reaches the front end of the cooling air passage 70, it hits the lower end of the fan guide 17 and flows upward along the rear surface of the fan guide 17.
  • the upstream cooling air AR1 flowing upward along the fan guide 17 is sucked into the second space 16B from the guide hole 17A and flows into the fan 72.
  • the upstream cooling air AR1 sucked into the fan 72 flows out from the fan 72 radially outward as the downstream cooling air AR2. Then, the downstream cooling air AR2 discharged from the fan 72 is exhausted from the exhaust port 23 to the outside of the motor housing portion 16. At this time, the downstream cooling air AR2 flowing downward from the fan 72 is flowed downward along the front surface of the fan guide 17. Then, the downstream cooling air AR2 that has reached the lower end of the fan guide 17 flows downward and diagonally forward along the inclined wall 17C of the fan guide 17 and the case inclined portion 61C exposed from the exposed hole 17D, and flows downward. It is exhausted from the exhaust port 23 to the outside of the motor housing portion 16. That is, the downstream cooling air AR2 flows to the exhaust port 23 side while cooling the front end portion of the case 61.
  • the motor 40, the fan 72, and the control unit 60 are housed in the motor housing unit 16 of the housing 12, and the intake port 22 is housed in the motor housing unit 16. And the exhaust port 23 is formed.
  • cooling air AR that is sucked in from the intake port 22 and exhausted from the exhaust port 23 is generated in the motor housing portion 16.
  • Side cooling air AR2 is generated.
  • the control unit 60 having the switching element 63 that generates heat during operation is cooled by the upstream cooling air AR1 and the downstream cooling air AR2.
  • the control unit 60 can be efficiently cooled as compared with the configuration in which the control unit 60 is cooled by one of the upstream cooling air AR1 and the downstream cooling air AR2. Therefore, the cooling performance for the control unit 60 can be improved.
  • the air that has just entered the motor housing portion 16 from the intake port 22 has a high cooling effect because the temperature is low, and the rear end portion of the control unit 60 is the upstream portion of the upstream cooling air AR1 (air before cooling the motor 40). ), So the cooling effect is high.
  • the downstream cooling air AR2 tends to have a faster air flow
  • the control unit 60 can be suitably cooled by applying an exhaled air (air after cooling of the motor 40) having a high wind speed to the control unit 60.
  • the present invention has a cooling configuration utilizing the advantages of each of the suction air and the discharge air, such as applying a suction air having a relatively low temperature to the control unit 60 and also applying an discharge air having a high wind speed to the control unit 60. Is a feature.
  • the housing may become larger than necessary or the structure may be complicated because a sufficient flow path is formed.
  • design freedom can be obtained, and the housing becomes larger or more complicated.
  • the control unit 60 can be suitably cooled without this.
  • the motor housing unit 16 has a first space 16A through which the upstream cooling air AR1 passes and a second space 16B through which the downstream cooling air AR2 passes, and the control unit 60 has a first space. It is exposed to 16A and the second space 16B.
  • the control unit 60 is arranged between the intake port 22 and the fan 72. Further, a part (front end portion) of the control unit 60 is exposed to the second space 16B by the exposed hole 17D of the fan guide 17, and is arranged between the fan 72 and the exhaust port 23. As a result, the control unit 60 can be cooled by the upstream cooling air AR1 and the downstream cooling air AR2.
  • the motor housing portion 16 is provided with a fan guide 17 for partitioning the first space 16A and the second space 16B, and the upstream cooling air AR1 and the downstream cooling air AR2 are rectified by the fan guide 17. .. Specifically, the direction of the upstream cooling air AR1 flowing through the cooling air passage 70 is changed upward by the fan guide 17, and the upstream cooling air AR1 flows upward along the rear surface of the fan guide 17. It is sucked into the second space 16B from the guide hole 17A. As a result, the upstream cooling air AR1 can be efficiently flowed to the second space 16B side. Further, the downstream cooling air AR2 flowing out from the fan 72 flows downward along the front surface of the fan guide 17. Therefore, the front end portion of the control unit 60 can be cooled by the downstream cooling air AR2 while suppressing the backflow of the downstream cooling air AR2 to the first space 16A side by the fan guide 17.
  • the fan 72 is arranged in the second space 16B on the front side of the guide hole 17A.
  • the upstream cooling air AR1 can be efficiently discharged from the guide hole 17A to the second space 16B side by the air flow generated by the fan 72, and can flow into the fan 72.
  • the motor 40 and the control unit 60 are housed in the first space 16A, and the control unit 60 is arranged apart from each other on the radial outer side (lower side) of the motor 40.
  • a cooling air passage 70 for passing the upstream cooling air AR1 can be formed between the motor 40 and the control unit 60, and a part of the wall portion of the cooling air passage 70 can be formed in the control unit 60. It can be configured by the case 61. Therefore, the control unit 60 and the motor 40 can be efficiently cooled by the upstream cooling air AR1 passing through the cooling air passage 70.
  • the case 61 of the control unit 60 is formed in a substantially box shape open to the lower side, and the wall portion of the cooling air passage 70 is formed by the bottom wall 61A of the case 61.
  • the intake port 22 is arranged on the upper side of the case 61 (the side opposite to the opening 61D).
  • the upstream cooling air AR1 passing through the cooling air passage 70 moves forward along the upper surface of the bottom wall 61A to cool the control unit 60, and the upstream cooling air AR1 is the control board in the case 61. It is possible to suppress direct contact with the switching element 63 mounted on the 62 or the control board 62 or an electronic element such as wiring.
  • the chips generated during the operation of the saver saw 10 flow into the first space 16A together with the upstream cooling air AR1, it is possible to prevent the chips from hitting the control board 62 or the electronic element. Therefore, it is possible to improve the cooling performance for the control unit 60 while improving the protection performance for the control board 62.
  • the material to be processed is a metal, the protection performance against the control substrate 62 can be effectively improved.
  • the upstream cooling air AR1 flows forward along the upper surface of the bottom wall 61A of the control unit 60, the upstream cooling air AR1 can be smoothly flowed in the cooling air passage 70. Further, by partially partitioning the inside of the motor housing portion 16 by the control unit 60, the upper space and the lower space of the control unit 60 can be partitioned, and the first space 16A can be easily formed. That is, by attaching the control unit 60, the air passage of the upstream cooling air AR1 can be easily formed, and it is not necessary to provide the motor housing unit 16 with a structure (rib or the like) for forming the air passage more than necessary. ..
  • the control unit 60 is made to function as a wall for partitioning the first space 16A and also as a wall for partitioning the second space 16B.
  • the control unit 60 can be cooled by the upstream cooling air AR1 heading in the axial direction and the downstream cooling air AR2 heading outward in the radial direction, and the cooling air is controlled by a simple configuration without making a U-turn.
  • a suitable cooling configuration of the unit 60 can be realized.
  • the case 61 of the control unit 60 is sandwiched from the outside in the left-right direction by the sandwiching portion 21 of the motor housing portion 16. Specifically, the left and right holding portions 21 are arranged outside the intake port 22 in the left-right direction to sandwich the case 61 in the left-right direction. As a result, the case 61 can be fixed by the sandwiching portion 21 without obstructing the flow of the upstream cooling air AR1 in the cooling air passage 70.
  • the cooling structure S of the first modification has the same configuration as that of the present embodiment except for the following points. That is, in the cooling structure S of the first modification, the communication hole 17E is formed through the lower side of the front fixing portion 17B of the fan guide 17. As a result, the lower space of the control unit 60 and the second space 16B are communicated with each other by the communication hole 17E. That is, in the first modification, the second space 16B expands to the lower space of the control unit 60.
  • the space on the upstream side of the second space 16B and the first space 16A are partitioned by the fan guide 17, and the space on the downstream side of the second space 16B and the first space 16A are partitioned by the control unit 60.
  • the exhaust port 23 formed on the lower wall of the motor housing portion 16 is moved to the rear side as compared with the present embodiment. Specifically, the exhaust port 23 is arranged below the rear end portion of the control unit 60. As a result, the rear end portion of the second space 16B and the outside of the motor housing portion 16 are communicated with each other by the exhaust port 23.
  • the downstream cooling air AR2 flowing downward from the fan 72 flows downward along the front surface of the fan guide 17 and from the communication hole 17E of the fan guide 17. It flows into the space below the control unit 60. Then, the downstream cooling air AR2 that has flowed into the lower side of the control unit 60 flows to the rear side while cooling the lower side of the control unit 60, and flows from the exhaust port 23 on the lower side of the control unit 60 to the motor housing unit 16. It is leaked to the outside of. Therefore, even in the modification 1 of the cooling structure S, the control unit 60 can be cooled by the upstream cooling air AR1 and the downstream cooling air AR2. Therefore, even in the modification 1 of the cooling structure S, the cooling performance can be improved.
  • the control unit 60 is cooled from the opening 61D side of the case 61 by the downstream cooling air AR2. can do. That is, the control unit 60 can be cooled from both sides in the vertical direction (thickness direction of the control unit 60) by the upstream cooling air AR1 and the downstream cooling air AR2. Therefore, the cooling performance for the control unit 60 can be effectively improved.
  • the cooling structure S of the second modification has the same configuration as that of the present embodiment except for the following points. That is, in the cooling structure S of the second modification, the exhaust port 23 is formed on the left and right side walls of the motor housing portion 16. Specifically, the exhaust port 23 is formed at six locations on the upper portion and the lower portion of the motor housing portion 16 so as to overlap the rear end portion of the stator 43 of the motor 40 in a side view. It should be noted that only the left side surface portion is shown in the figure, and since the same exhaust port structure is actually provided on the right side surface, a total of 12 exhaust port 23s are formed in the present embodiment.
  • a partition wall 25 is formed on the rear side of the exhaust port 23, and the space outside the radial direction of the motor 40 is partitioned back and forth by the partition wall 25. That is, in the second modification, the cooling air passage 70 is shielded by the partition wall 25.
  • the portion of the fan guide 17 other than the front fixing portion 17B is omitted, and the flow path changing portion 26 is formed between the motor 40 and the fan 72.
  • the flow path changing portion 26 has a structure in which a cross section opened to the rear side is formed in a substantially U-shaped plate shape (rib shape) in a side view. Further, an insertion hole 26A penetrating in the front-rear direction is formed in the substantially central portion of the flow path changing portion 26, and the drive shaft 41 of the motor 40 inserts the inside of the insertion hole 26A. That is, the flow path changing portion 26 is a bowl-shaped component having an open bottom portion, and is provided so that the rear edge portion is in contact with or close to the front end portion of the stator 43. Half of the flow path changing portion 26 is provided on one of the pair of split housings 15, and the other half is provided on the other, and is formed by assembling the split housings 15 to each other.
  • the upstream cooling air AR1 flowing into the motor housing portion 16 from the intake port 22 flows into the motor 40 from the radial inside and the radial outside of the motor substrate 45, and the motor 40 It flows forward inside.
  • the upstream cooling air AR1 flows forward through the inside of the stator 43 and the portion between the rotor 42 and the stator 43.
  • the upstream cooling air AR1 flowing inside the motor 40 hits the flow path changing portion 26 and flows to the drive shaft 41 side along the rear surface of the flow path changing portion 26.
  • the upstream cooling air AR1 flows into the fan 72 from the insertion hole 26A.
  • the upstream cooling air AR1 flowing into the fan 72 flows out as the downstream cooling air AR2 to the outside in the radial direction of the fan 72.
  • the downstream cooling air AR2 flows to the exhaust port 23 side. Therefore, the downstream cooling air AR2 flows to the rear side along the front surface of the flow path changing portion 26, and also flows to the rear side on the upper side and the lower side of the motor 40. Then, the downstream cooling air AR2 that has flowed to the rear side on the upper side and the lower side of the motor 40 is exhausted from the exhaust port 23 to the outside of the motor housing portion 16.
  • the motor 40 sinator 43
  • the motor 40 corresponds to the cooled portion of the present invention, and the cooling performance for the motor 40 can be improved.
  • the downstream cooling air AR2 flowing to the lower side of the motor 40 flows between the motor 40 and the control unit 60, and is exhausted from the exhaust port 23 to the outside of the motor housing unit 16. Therefore, the control unit 60 and the motor 40 can be cooled by the downstream cooling air AR2.
  • the cooling structure S is applied to the saver saw 10 to cool the control unit 60 and the motor 40 of the saver saw 10, but the cooling structure S may be applied to other working machines. good.
  • the cooling structure S is applied to another working machine will be described as a variation of the working machine.
  • FIG. 13 is a partially broken plan view of the circular saw 100 as viewed from above.
  • the arrows FR and RH shown in FIG. 13 indicate the front side and the right side of the circular saw 100.
  • the circular saw 100 includes a base 102 and a circular saw main body 104.
  • the base 102 is formed in a substantially rectangular plate shape with the vertical direction as the plate thickness direction.
  • the circular saw main body 104 is arranged above the base 102 and is connected to the base 102.
  • the circular saw main body 104 includes a housing 110 that constitutes the outer shell of the circular saw main body 104, a motor 120 arranged in the housing 110, and a control unit 140 that controls the motor 120. Further, the circular saw main body 104 has a circular saw blade (not shown), and the circular saw blade is covered from above by the saw cover 152. Then, the rotational force of the motor 120 is transmitted to the circular saw blade, and the circular saw blade rotates to cut the material to be machined.
  • the housing 110 includes a motor housing portion 111 that accommodates the motor 120, and a controller housing portion 112 that is arranged behind the motor housing portion 111 and accommodates the control unit 140.
  • the motor housing portion 111 and the controller housing portion 112 are formed in a concave shape that is open to the right side, and the left portion of the motor housing portion 111 and the left portion of the controller housing portion 112 are partitioned by a partition wall 113.
  • a plurality of intake ports 114 are formed through the front portion of the left wall of the controller housing portion 112, and a plurality of exhaust ports 115 are formed through the rear portion of the left wall of the controller housing portion 112.
  • the motor 120 is housed in the motor housing portion 111.
  • the motor 120 includes a drive shaft 121 having an axial direction in the left-right direction, a rotor 122 arranged radially outside the drive shaft 121, and a stator 123 arranged radially outside the rotor 122. ing. Further, a ring plate-shaped motor substrate 125 is provided on the right side of the rotor 122 and the stator 123, and the motor substrate 125 is fixed to the stator holder 124 of the stator 123.
  • a fan 130 is integrally rotatable on the right side of the motor substrate 125, and the fan 130 is configured as a centrifugal fan.
  • the downstream cooling air AR4 generated by the fan 130 flows to the rear side and flows into the right end portion of the controller housing portion 112.
  • the control unit 140 is housed in the controller housing unit 112.
  • the control unit 140 has a case 142 that constitutes the outer shell of the control unit 140.
  • a control board (not shown) is housed in the case 142, and the motor 120 is connected to the control board.
  • the case 142 has a thickness direction in the front-rear direction, is formed in a substantially box shape open to the front side, and is fixed to the controller housing portion 112. Specifically, the right end portion of the case 142 is fixed to the fixing rib 112A of the controller housing portion 112, the bottom wall of the case 142 is fixed to the fixing rib 112B of the controller housing portion 112, and the left end portion of the case 142 is fixed. It is fixed to the fixed rib 112C and the fixed rib 112D of the controller housing portion 112.
  • the case 142 extends in the left-right direction in the controller housing portion 112. Specifically, the left end portion of the case 142 is arranged adjacent to the right side of the left wall of the controller housing portion 112, and the right end portion of the case 142 is arranged apart from the rear side of the fan 130. As a result, the inside of the controller housing unit 112 is partitioned in the front-rear direction by the case 142 of the control unit 140.
  • the space on the front side of the control unit 140 in the controller housing unit 112 is configured as the first space 116, and the first space 116 and the outside of the housing 110 are communicated with each other by the intake port 114.
  • the space behind the control unit 140 in the controller housing unit 112 is configured as the second space 117, and the second space 117 and the outside of the housing 110 are communicated with each other by the exhaust port 115. Further, the right end portion of the second space 117 is opened to the front side and is arranged on the rear side of the fan 130.
  • the fan 130 rotates around the drive shaft 121 together with the drive shaft 121 of the motor 120.
  • the upstream cooling air AR3 flows into the first space 116 of the controller housing portion 112 from the intake port 114.
  • the upstream cooling air AR3 flowing into the first space 116 flows to the right side while cooling the opening side of the case 142 in the control unit 140 and hits the fixed rib 112A.
  • the upstream cooling air AR3 that hits the fixed rib 112A flows to the front side (fan 130 side).
  • the upstream cooling air AR3 flows on both sides of the motor substrate 125 in the plate thickness direction and flows into the fan 130 from the left side.
  • the upstream cooling air AR3 that has flowed into the fan 130 is discharged from the fan 130 to the rear side as the downstream cooling air AR4, and the downstream cooling air AR4 flows into the right end of the second space 117 of the controller housing portion 112. ..
  • the downstream cooling air AR4 flowing in the right end portion of the second space 117 hits the rear wall of the controller housing portion 112 and flows to the exhaust port 115 side. That is, the downstream cooling air AR4 flows to the left in the second space 117 while cooling the bottom wall of the case 142 of the control unit 140. Then, the downstream cooling air AR4 is exhausted from the exhaust port 115 to the outside of the controller housing portion 112.
  • the upstream cooling air AR3 flowing into the fan 130 and the downstream cooling air AR4 flowing out from the fan 130 generated in the housing 110 by the rotation of the fan 130 are generated on the upstream side.
  • the control unit 140 is cooled by the cooling air AR3 (suction air) and the downstream cooling air AR4 (exhaust air). Therefore, even in the circular saw 100, the cooling performance for the control unit 140 can be improved.
  • the downstream cooling air AR4 may contain air after cooling the motor 120.
  • the control unit 140 is cooled from both sides in the thickness direction by the upstream cooling air AR3 and the downstream cooling air AR4. Thereby, the cooling performance for the control unit 140 can be effectively improved.
  • the opening side of the case 142 is positioned in the space through which the upstream cooling air AR3 passes. This is because the circular saw 100 is a tool that mainly processes wood, and the effect of the processed wood pieces on the electronic elements and the like is smaller than that of metal, and the electronic elements exposed from the case 142 are directly upstream cooling air AR3. This is the result of considering the preferential cooling by exposing to.
  • FIG. 14 is a cross-sectional view of the hammer drill 200 as viewed from the right side.
  • the arrow UP and the arrow FR shown in FIG. 14 indicate the upper side and the front side of the hammer drill 200.
  • the hammer drill 200 controls a housing 210 that constitutes the outer shell of the hammer drill 200, a motor 220 housed in the housing 210, a drive mechanism 250 that is driven by the driving force of the motor 220 and has a tip tool attached, and the motor 220. It is configured to include a control unit 240 and the like. When the motor 220 is driven, the driving force transmitted from the motor 220 to the drive mechanism 250 applies a rotational force and a striking force to the workpiece from the tip tool.
  • the housing 210 is formed in a hollow shape and is formed in a substantially P-shape in the horizontal direction.
  • the housing 210 includes a motor housing portion 211 constituting a lower front end portion of the housing 210 and a controller housing portion 212 arranged on the rear side of the motor housing portion 211, and is configured by a partition wall 213.
  • a partition is provided between the lower portion of the motor housing portion 211 and the lower portion of the controller housing portion 212.
  • a plurality of intake ports 214 are formed through the front portion of the lower wall of the controller housing portion 212, and a plurality of exhaust ports 215 are formed in the rear portion of the lower wall of the controller housing portion 212.
  • the motor 220 includes a drive shaft 221 having an axial direction in the vertical direction, a rotor 222 arranged radially outside the drive shaft 221 and a stator 223 arranged radially outside the rotor 222. ing. Further, an annular plate-shaped motor substrate 225 is provided on the upper side of the rotor 222 and the stator 223, and the motor substrate 225 is fixed to the stator holder 224 of the stator 223.
  • a fan 230 is integrally rotatable on the upper end of the drive shaft 221 on the upper side of the motor substrate 225, and the fan 230 is configured as a centrifugal fan. As a result, the downstream cooling air AR6 generated by the fan 230 flows from the fan 230 to the rear side and flows into the upper end portion of the controller housing portion 212.
  • the control unit 240 is housed in the controller housing unit 212.
  • the control unit 240 has a case 242 that constitutes the outer shell of the control unit 240.
  • a control board (not shown) is housed in the case 242, and the motor 220 is connected to the control board.
  • the case 242 has a thickness direction in the front-rear direction, is formed in a substantially box shape open to the rear side, and is fixed to the controller housing portion 212.
  • the case 242 extends in the vertical direction in the controller housing portion 212. Specifically, the lower end portion of the case 242 is arranged close to the upper side of the lower wall of the controller housing portion 212, and the upper end portion of the case 242 protrudes above the partition wall 213. As a result, the inside of the controller housing portion 212 is partitioned in the front-rear direction by the case 242 of the control portion 240.
  • the space on the front side of the control unit 240 in the controller housing unit 212 is configured as the first space 216, and the first space 216 and the outside of the controller housing unit 212 are communicated with each other by the intake port 214.
  • the space behind the control unit 240 in the controller housing unit 212 is configured as the second space 217, and the second space 217 and the outside of the controller housing unit 212 are communicated with each other by the exhaust port 215.
  • the fan 230 rotates around the axis of the drive shaft 221 together with the drive shaft 221 of the motor 220.
  • the upstream cooling air AR5 flows into the first space 216 of the controller housing portion 212 from the intake port 214.
  • the upstream cooling air AR5 that has flowed into the first space 216 flows upward while cooling the bottom wall of the case 242 of the control unit 240, and flows into the motor housing unit 211 from the upper side of the partition wall 213.
  • the upstream cooling air AR5 that has flowed into the motor housing portion 211 flows upward between the motor substrate 225 and the drive shaft 221 and flows into the fan 230.
  • the upstream cooling air AR5 that has flowed into the fan 230 is discharged from the fan 230 to the rear side as the downstream cooling air AR6, and the downstream cooling air AR6 flows into the upper end of the second space 217 of the controller housing portion 212. ..
  • the downstream cooling air AR6 flowing to the upper end of the second space 217 hits the rear wall of the controller housing portion 212 and flows downward in the second space 217 while cooling the control unit 240 from the opening side of the case 242. .. Then, the downstream cooling air AR6 is exhausted from the exhaust port 215 to the outside of the controller housing portion 212.
  • the upstream cooling air AR5 flowing into the fan 230 and the downstream cooling air AR6 flowing out from the fan 230 generated in the housing 210 by the rotation of the fan 230 are generated in the housing 210 to cool the upstream side.
  • the control unit 240 is cooled by the wind AR5 and the downstream cooling wind AR6. Therefore, even in the hammer drill 200, the cooling performance for the control unit 240 can be improved.
  • control unit 240 is cooled from both sides in the thickness direction by the upstream cooling air AR5 and the downstream cooling air AR6. Thereby, the cooling performance for the control unit 240 can be effectively improved.
  • control Part cooled part
  • 142 ... Case, 200 ... Hammadrill (working machine), 210 ... Housing, 214 ... Intake port, 215 ... Exhaust port, 216 ... First space, 217 ... Second space, 220 ... Motor, 230 ... Fan, 240 ... Control unit (cooled unit), 242 ... Case, AR ... Cooling air, AR1 ... Upstream cooling air, AR2 ... Downstream cooling air, AR3 ... Upstream cooling air, AR4 ... Downstream cooling air, AR5 ... upstream cooling air, AR6 ... downstream cooling air

Abstract

La présente invention améliore la performance de refroidissement d'une pièce devant être refroidie. Une scie sauteuse (10) présente un moteur (40), un ventilateur (72) et une partie de commande (60) reçue dans une section de logement de moteur (16) d'un logement (12), et une entrée d'air (22) et une sortie d'air (23) formées dans la section de logement de moteur (16). Ainsi, un air de refroidissement côté amont (AR1), qui est amené à s'écouler dans la section de logement de moteur (16) à partir de l'entrée d'air (22) et à s'écouler vers le ventilateur (72), et un air de refroidissement côté aval (AR2), qui est amené à s'écouler hors du ventilateur (72) et à être évacué vers l'extérieur de la section de logement de moteur (16) à partir de la sortie d'air (23), sont générés. Ensuite, la partie de commande (60) est refroidie par l'air de refroidissement côté amont (AR1) et l'air de refroidissement côté aval (AR2). Ceci permet de refroidir efficacement la partie de commande (60), par rapport à une structure pour le refroidissement de la partie de commande (60) par l'un de l'air de refroidissement côté amont (AR1) et de l'air de refroidissement côté aval (AR2). Il est ainsi possible d'améliorer la performance de refroidissement pour la partie de commande (60).
PCT/JP2021/032424 2020-09-30 2021-09-03 Engin de chantier WO2022070765A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007515147A (ja) * 2003-12-19 2007-06-07 テルマ 通気を行うための手段を備える電磁制動機
WO2016067810A1 (fr) * 2014-10-31 2016-05-06 日立工機株式会社 Machine de travail électrique
JP2016068205A (ja) * 2014-09-30 2016-05-09 日立工機株式会社 電動工具
JP2016124049A (ja) * 2014-12-26 2016-07-11 日立工機株式会社 電動工具および制御基板の製造方法
JP2018103318A (ja) * 2016-12-27 2018-07-05 日立工機株式会社 電動工具

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007515147A (ja) * 2003-12-19 2007-06-07 テルマ 通気を行うための手段を備える電磁制動機
JP2016068205A (ja) * 2014-09-30 2016-05-09 日立工機株式会社 電動工具
WO2016067810A1 (fr) * 2014-10-31 2016-05-06 日立工機株式会社 Machine de travail électrique
JP2016124049A (ja) * 2014-12-26 2016-07-11 日立工機株式会社 電動工具および制御基板の製造方法
JP2018103318A (ja) * 2016-12-27 2018-07-05 日立工機株式会社 電動工具

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