WO2021220993A1 - 動力工具 - Google Patents

動力工具 Download PDF

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Publication number
WO2021220993A1
WO2021220993A1 PCT/JP2021/016541 JP2021016541W WO2021220993A1 WO 2021220993 A1 WO2021220993 A1 WO 2021220993A1 JP 2021016541 W JP2021016541 W JP 2021016541W WO 2021220993 A1 WO2021220993 A1 WO 2021220993A1
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WO
WIPO (PCT)
Prior art keywords
bearing
housing
motor
holding portion
power tool
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2021/016541
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
領祐 仲野
仁一 横山
賢 伊縫
智翔 曹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koki Holdings Co Ltd
Original Assignee
Koki Holdings Co Ltd
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 Koki Holdings Co Ltd filed Critical Koki Holdings Co Ltd
Priority to JP2022518041A priority Critical patent/JP7464112B2/ja
Publication of WO2021220993A1 publication Critical patent/WO2021220993A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B47/00—Constructional features of components specially designed for boring or drilling machines; Accessories therefor
    • 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
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • 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 power tool.
  • the tip tool is attached to the tip of the vibration drill, and the motor is housed inside the vibration drill. Then, the rotational force of the motor is transmitted to the tip tool to perform drilling or the like on the machined material.
  • the rear end portion of the rotating shaft of the motor is rotatably supported by a bearing, and the bearing is held by the housing.
  • the housing is formed with an intake port around a portion that holds the bearing, so that air can flow into the housing from the intake port.
  • the motor tends to rotate at high speed as the output increases. Therefore, the temperature of the bearing that supports the rotating shaft of the motor rises. Therefore, in the power tool, it is desirable to have a structure capable of cooling the bearing.
  • One or more embodiments of the present invention are formed in the housing, a housing that houses the motor, a bearing that rotatably supports the rotation shaft of the motor, or a drive shaft that is driven by the rotation of the motor, and the housing.
  • the power tool is provided with a communication hole for communicating the inside and the outside of the housing, and a part of the bearing is exposed to the communication hole.
  • One or more embodiments of the present invention is a power tool in which the housing is provided with a bearing holding portion for holding the bearing, and the communication hole is formed in the bearing holding portion.
  • the bearing holding portion is formed in a bottomed tubular shape, and the inside of the bearing holding portion is configured as a bearing accommodating portion for accommodating the bearing.
  • a power tool having an exposed portion formed on the side wall of the bearing to expose a part of the bearing to the communication hole side.
  • One or more embodiments of the present invention include a housing that houses the motor, a bearing that rotatably supports one end of the rotation shaft of the motor in the axial direction, and a bottomed cylinder provided in the housing.
  • a power tool that is formed in a shape and includes a bearing holding portion for accommodating the bearing inside, and an exposed portion that exposes a part of the bearing to the outside in the radial direction is formed on the side wall of the bearing holding portion. Is.
  • a communication hole for communicating the inside and the outside of the housing is formed on the side wall of the bearing holding portion, and the exposed portion is formed between the communication hole and the bearing. It is a power tool that communicates with the inside of the holding portion and is configured as a groove portion extending in the axial direction of the bearing holding portion.
  • the plurality of communication holes are arranged side by side in the circumferential direction of the bearing holding portion, and the plurality of the groove portions are one in the circumferential direction of the bearing holding portion. It is a power tool formed on the inner side in the radial direction of the communication hole of the bearing.
  • One or more embodiments of the present invention are power tools in which the bearing is covered by the housing from one side in the axial direction and by a sealing member from the other side in the axial direction.
  • One or more embodiments of the present invention is a power tool in which the sealing member is integrally rotatably fixed to the rotating shaft.
  • One or more embodiments of the present invention is a power tool in which a blade portion is formed in the seal member, and the blade portion generates an air flow outward in the radial direction of the rotation shaft.
  • a fan is provided on the other side of the rotating shaft in the axial direction, and the housing has an exhaust hole for letting out an air flow generated by the fan.
  • the housing has an exhaust hole for letting out an air flow generated by the fan.
  • the housing is a power tool comprising a motor housing for accommodating the motor and a handle housing having a pair of cover members for sandwiching the motor housing. be.
  • the housing houses a drive mechanism unit that transmits the driving force of the motor to the tip tool, and the drive mechanism unit applies a rotational force to the tip tool. It is a power tool configured to be switchable between a first mode in which the tip tool is applied and a second mode in which a rotational force and a striking force are applied to the tip tool.
  • the motor is a power tool driven by a battery pack that is removable from the housing.
  • the bearing can be cooled.
  • FIG. 5 is a cross-sectional view (5-5 line cross-sectional view of FIG. 4) in which the bearing holding portion shown in FIG. 4 is broken at a portion of the first intake hole. It is sectional drawing (the sectional view of line 6-6 of FIG. 4) which cut
  • FIG. 5 is an exploded perspective view of the bearing holding portion, the rear motor bearing, the dust seal, and the rotating shaft shown in FIG. 5 as viewed diagonally from the front on the right side.
  • the vibration drill 10 as a "power tool" 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 vibration drill 10, respectively.
  • the vertical, front-back, and left-right directions are indicated unless otherwise specified.
  • the vibration drill 10 is configured as a tool for drilling or the like on a work piece. As shown in FIGS. 1 and 2, the vibration drill 10 includes a housing 20, a motor 40 housed in the housing 20, a drive mechanism unit 50 driven by the driving force of the motor 40, a battery pack 70, and the like. It is configured to include a control unit 72 that drives and controls the motor 40.
  • the vibration drill 10 has an operation knob 38.
  • the operation knob 38 is exposed to the outside of the vibration drill 10 so that it can be slid in the left-right direction. Then, the operation mode of the vibration drill 10 is switched by operating the operation knob 38. Specifically, by arranging the operation knob 38 at the drill mode position slid to the left, the drill mode is set as the "first mode" in which the tip tool T rotates. On the other hand, by arranging the operation knob 38 at the vibration drill mode position slid to the right side, the tip tool T is configured to be in the vibration drill mode as the "second mode" in which the tip tool T rotates and reciprocates in the front-rear direction. There is. Further, the vibration drill 10 has a bearing cooling structure S, and the bearing cooling structure S is applied to the rear motor bearing 45 that rotatably supports the rotating shaft 41 of the motor 40. Hereinafter, each configuration of the vibration drill 10 will be described.
  • the housing 20 constitutes the outer shell of the vibration drill 10.
  • the housing 20 includes a handle housing 22 that constitutes the rear portion of the housing 20, a motor housing 24 that constitutes an intermediate portion in the front-rear direction of the housing 20, and a gear housing 28 that constitutes the front portion of the housing 20. There is.
  • the handle housing 22 is formed in a substantially P shape when viewed from the right side.
  • the handle housing 22 is divided into two in the left-right direction, and the handle housing 22 is formed by assembling the two-divided cover members 23 to each other.
  • the rear end portion of the handle housing 22 is configured as a handle portion 22A gripped by an operator, and the handle portion 22A extends in the vertical direction. Further, in the front portion of the handle housing 22, a circular exposed hole 22B for exposing the bearing holding portion 26 of the motor housing 24, which will be described later, is formed through the front portion of the handle portion 22A in the front-rear direction.
  • a trigger 33 is provided at the upper end of the handle portion 22A.
  • the handle housing 22 is provided with a switching button 34 on the upper side of the trigger 33 for switching the rotation direction of the motor 40, which will be described later.
  • the handle housing 22 is provided with a switch mechanism 35 on the rear side of the trigger 33.
  • the switch mechanism 35 has a switch (not shown) operated by a trigger 33 and a changeover button 34.
  • the switch is electrically connected to the control unit 72, which will be described later, and is configured to output an output signal to the control unit 72 according to the operating state of the trigger 33 and the switching state of the switching button 34.
  • the handle housing 22 is provided with a speed change switch 36 on the lower side of the exposed hole 22B.
  • the speed change switch 36 is configured as a switch that switches the rotation speed of the motor 40 described later in multiple stages by being operated, and is electrically connected to the control unit 72 described later.
  • the lower end of the handle housing 22 is configured as a battery mounting portion 22C for mounting the battery pack 70 described later, and the battery mounting portion 22C is formed in a concave shape that is open to the front side and the lower side in a side view. ..
  • the battery mounting portion 22C is provided with a connector 37 that is connected to the battery pack 70, which will be described later.
  • the motor housing 24 is formed in a substantially bottomed cylindrical shape that is open to the front side. Then, the motor housing 24 is arranged on the front side of the upper part of the handle housing 22, and is connected to the pair of cover members 23 in a state of being sandwiched in the left-right direction by the divided cover members 23. Specifically, the motor housing 24 is fastened together with one cover member 23 to the other cover member 23. When the handle housing 22 and the motor housing 24 are connected to each other, the vertical intermediate portions of the left and right side portions of the motor housing 24 are exposed to the outside.
  • the motor housing 24 has a bearing holding portion 26, and the bearing holding portion 26 constitutes a central portion of the bottom portion of the motor housing 24.
  • the bearing holding portion 26 is formed in a bottomed cylindrical shape that is open to the front side. Further, the bearing holding portion 26 constitutes a bearing cooling structure S described later, and the details of the bearing holding portion 26 will be described later.
  • the motor housing 24 has four arm portions 24A, and the arm portion 24A extends radially outward from the bearing holding portion 26 and is connected to the side wall of the motor housing 24. Further, the four arm portions 24A are arranged at 90 degree intervals (equal intervals) in the circumferential direction of the bearing holding portion 26.
  • the gear housing 28 includes a first gear housing 29 that constitutes the rear portion of the gear housing 28 and a second gear housing that constitutes the front portion of the gear housing 28. 30 and are included in the configuration.
  • the first gear housing 29 is formed in a cylindrical shape with the front-rear direction as the axial direction
  • the second gear housing 30 is formed in a concave shape open to the rear side.
  • the first gear housing 29 and the second gear housing 30 are fastened and fixed to the motor housing 24 so as to close the front opening of the motor housing 24.
  • a housing cylinder portion 30A is formed on the upper portion of the second gear housing 30, and the housing cylinder portion 30A is formed in a cylindrical shape whose axial direction is the front-rear direction and projects forward from the second gear housing 30. There is.
  • exhaust portions 31 are formed on the left and right side portions between the motor housing 24 and the first gear housing 29, and a plurality of exhaust portions 31 that communicate the inside and the outside of the housing 20 are formed in the exhaust portions 31.
  • the exhaust hole 31A is formed.
  • an operation knob 38 is provided at the upper end of the first gear housing 29 so as to be slidable in the left-right direction, and the operation knob 38 is exposed to the outside of the housing 20.
  • the motor 40 is housed inside the motor housing 24.
  • the motor 40 includes a rotating shaft 41, a rotor 42, and a stator 43.
  • the rotating shaft 41 is arranged coaxially with the bearing holding portion 26 with the front-rear direction as the axial direction.
  • the rear end portion (one side end portion in the axial direction) of the rotating shaft 41 is rotatably supported by the rear side motor bearing 45 as a "bearing" held by the bearing holding portion 26 of the motor housing 24.
  • the front end portion (the other end portion in the axial direction) of the rotating shaft 41 is rotatably supported by the front side motor bearing 46 held by the first gear housing 29.
  • the rotor 42 is arranged on the outer side in the radial direction of the rotating shaft 41, and is configured to be integrally rotatable with the rotating shaft 41.
  • the stator 43 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is supported by the motor housing 24 on the radial outer side of the rotor 42.
  • the stator 43 has a stator holder, and a stator coil is wound around the stator holder. Then, the stator coil is connected to the control unit 72, which will be described later. As a result, the motor 40 is driven by the control of the control unit 72.
  • a fan 47 is integrally rotatably provided on the front end side portion of the rotating shaft 41 on the rear side of the front motor bearing 46.
  • the fan 47 is configured as a centrifugal fan and is arranged inside the exhaust unit 31 in the radial direction. Then, the fan 47 is configured to generate an air flow from the rear side to the front side so that the air flow flows outward in the radial direction of the fan 47. Therefore, the structure is such that air flows into the motor housing 24 from the intake hole 26D of the bearing holding portion 26, which will be described later, and the air is discharged from the exhaust hole 31A. As a result, the motor 40 is cooled.
  • the front end portion of the rotating shaft 41 is housed in the first gear housing 29, and the pinion gear 41A is formed at the front end portion of the rotating shaft 41.
  • the drive mechanism unit 50 has a spindle 51.
  • the spindle 51 is formed in a substantially columnar shape with the front-rear direction as the axial direction, and is arranged in the upper part of the gear housing 28. Specifically, the spindle 51 is arranged coaxially with the housing cylinder portion 30A of the second gear housing 30.
  • the front end side portion of the spindle 51 is rotatably supported by the front spindle bearing 52 fixed to the second gear housing 30, and the rear end portion of the spindle 51 is fixed to the first gear housing 29 on the rear side. It is rotatably supported by the spindle bearing 53. Further, the spindle 51 is supported by the front spindle bearing 52 and the rear spindle bearing 53 so as to be relatively movable in the front-rear direction.
  • the front end portion of the spindle 51 projects forward from the housing cylinder portion 30A.
  • a drill chuck 54 is fastened and fixed to the front end of the spindle 51, and a tip tool T is attached to the drill chuck 54.
  • a recess 51A opened to the rear side is formed at the rear end of the spindle 51, and a steel ball 55 is provided in the recess 51A.
  • a mode switching shaft 56 is provided on the rear side of the spindle 51.
  • the mode switching shaft 56 has an axial direction in the vertical direction and is formed in a substantially D-shaped cross section. That is, the outer peripheral surface of the mode switching shaft 56 is configured to include a flat surface portion and a curved surface portion.
  • the mode switching shaft 56 is connected to the operation knob 38, and the mode switching shaft 56 is configured to rotate around its own axis by sliding the operation knob 38. Specifically, at the drill mode position of the operation knob 38, the curved surface portion of the mode switching shaft 56 is arranged adjacent to the rear side of the steel ball 55, and at the vibration drill mode position of the operation knob 38, the flat surface portion of the mode switching shaft 56.
  • a drive gear 57 is provided on the rear end side of the spindle 51 so as to be integrally rotatable.
  • the drive gear 57 is connected to the pinion gear 41A of the rotating shaft 41 of the motor 40 by a two-stage gear 58.
  • the spindle 51 is provided with a first ratchet 59 so as to be integrally rotatable, and the first ratchet 59 is arranged adjacent to the rear side of the front spindle bearing 52.
  • a second ratchet 60 is provided on the rear side of the first ratchet 59.
  • the second ratchet 60 is arranged on the radial outer side of the spindle 51 and is fixed to the second gear housing 30.
  • an urging spring 61 is provided on the front side of the second ratchet 60, and the spindle 51 is urged to the front side by the urging force of the urging spring 61 and is arranged at the initial position.
  • the second ratchet 60 is arranged on the rear side of the first ratchet 59 with a predetermined gap.
  • Ratchet teeth are formed on the rear surface of the first ratchet 59 and the front surface of the second ratchet 60, respectively. Then, in the vibration drill mode, the spindle 51 is moved to the rear side against the urging force of the urging spring 61 so as to come into contact with the ratchet teeth of the first ratchet 59 and the ratchet teeth of the second ratchet 60. Has been done. As a result, when the spindle 51 rotates, the ratchet teeth of the first ratchet 59 get over the ratchet teeth of the second ratchet 60, so that the spindle 51 reciprocates in the front-rear direction.
  • the battery pack 70 is formed in a substantially rectangular parallelepiped shape.
  • the battery pack 70 is detachably attached to the battery mounting portion 22C of the handle housing 22 from the front side.
  • the battery pack 70 has a connector (not shown), and when the battery pack 70 is attached to the battery mounting portion 22C, the connector is connected to the connector 37, and power is supplied from the battery pack 70 to the control unit 72 described later. It is configured to be supplied.
  • the battery pack 70 has a pair of lock members 70A (see FIG. 1), and the lock members 70A are provided on the left and right side portions of the battery pack 70. When the battery pack 70 is mounted on the battery mounting portion 16B, the lock member 70A engages with the handle housing 22, and the movement of the battery pack 70 to the front side is restricted.
  • the control unit 72 is arranged in the lower end portion of the handle housing 22.
  • the switch of the switch mechanism 35, the speed change switch 36, and the battery pack 70 described above are electrically connected to the control unit 72.
  • the motor 40 is driven by the control unit 72, and the driving force of the motor 40 is transmitted to the tip tool T by the drive mechanism unit 50.
  • the rotation direction of the motor 40 is set according to the switching state of the changeover button 34, and the speed change switch 36 rotates at a rotation speed according to the operation position. It has become.
  • the bearing cooling structure S includes a bearing holding portion 26 of the motor housing 24, a rear motor bearing 45 held by the bearing holding portion 26, and a motor. It is configured to include a dust seal 80 as a "seal member" provided on the rotating shaft 41 of the 40.
  • the bearing holding portion 26 is formed in a substantially bottomed cylindrical shape that is open to the front side as a whole.
  • the bearing holding portion 26 includes a substantially disk-shaped bottom wall 26A having a plate thickness direction in the front-rear direction and a cylindrical side wall 26B extending forward from the outer peripheral portion of the bottom wall 26A. It is configured to include.
  • the inside of the bearing holding portion 26 is configured as a bearing accommodating portion 26C for accommodating the rear motor bearing 45.
  • a plurality of (in this embodiment, eight locations) intake holes 26D as "communication holes” are formed through the side wall 26B.
  • the intake holes 26D are formed in the shape of elongated holes curved along the circumferential direction of the bearing holding portion 26 when viewed from the front-rear direction, and are arranged at equal intervals in the circumferential direction of the bearing holding portion 26.
  • the inside of the intake hole 26D is configured as an air inflow passage 26E.
  • the intake holes 26D are classified into four first intake holes 26D1 and four second intake holes 26D2, and the first intake hole 26D1 and the second intake hole 26D2 are bearing holding portions 26. They are arranged alternately in the circumferential direction of.
  • a communication groove 26F is formed on the side wall 26B as an "exposed portion” and a "groove portion” on the radial inside of the first intake hole 26D1. That is, four communication grooves 26F are formed on the side wall 26B.
  • the communication groove 26F extends in the front-rear direction, is opened to the front side, and is penetrated in the radial direction of the bearing holding portion 26.
  • the inside of the first intake hole 26D1 (air inflow path 26E) and the bearing accommodating portion 26C are communicated with each other by the communication groove 26F.
  • the bottom portion of the communication groove 26F is arranged in the middle portion in the front-rear direction of the side wall 26B.
  • the rear motor bearing 45 is configured as a ball bearing. That is, the rear motor bearing 45 is between the inner ring 45A forming the radial inner portion of the rear motor bearing 45, the outer ring 45B forming the radial outer portion of the rear motor bearing 45, and the inner ring 45A and the outer ring 45B.
  • the ball 45C and the ball 45C in which the ball 45C is arranged are included in the ball 45C.
  • the rear motor bearing 45 is fitted into the bearing accommodating portion 26C of the bearing holding portion 26 and is held by the bearing holding portion 26. Further, the rotating shaft 41 of the motor 40 described above is fitted into the rear motor bearing 45 and rotatably supported by the rear motor bearing 45.
  • the dust seal 80 is formed in a substantially annular plate shape with the front-rear direction as the plate thickness direction.
  • the dust seal 80 is arranged close to the front side of the rear motor bearing 45, and is integrally rotatably fixed to the rotating shaft 41 of the motor 40.
  • the dust seal 80 covers the rear motor bearing 45 from the front side (the other side in the axial direction) with a minute gap provided between the rear motor bearing 45 and the dust seal 80 in the front-rear direction. .. Therefore, the dust seal 80 is configured to function as a seal member for the rear motor bearing 45.
  • a blade portion 80A is provided on the outer peripheral portion of the dust seal 80.
  • the blade portion 80A is formed in a ring shape when viewed from the front-rear direction, and protrudes forward from the dust seal 80.
  • the blade portion 80A is formed with a plurality of protrusions 80B (8 locations in the present embodiment).
  • the protrusions 80B project outward from the blade 80A in the radial direction and are arranged at equal intervals in the circumferential direction of the dust seal 80.
  • the blade portion 80A When the dust seal 80 rotates together with the rotating shaft 41, the blade portion 80A is configured to generate an air flow AR2 (see FIG. 5) outward in the radial direction of the dust seal 80. That is, the dust seal 80 is configured to also function as a centrifugal fan.
  • the vibration drill 10 configured as described above, when the trigger 33 is pulled, the motor 40 is driven by the control unit 72, and the tip tool T rotates together with the spindle 51. As a result, the work piece can be drilled. Further, in the vibration drill mode of the vibration drill 10, the spindle 51 moves from the initial position to the rear side by pressing the tip tool T against the workpiece. As a result, the ratchet teeth of the first ratchet 59 get over the ratchet teeth of the second ratchet 60, so that the spindle 51 and the tip tool T reciprocate in the front-rear direction while rotating. Therefore, in the vibration drill mode, drilling can be performed while applying a rotational force and a striking force to the workpiece.
  • the rear motor bearing 45 that rotatably supports the rotating shaft 41 of the motor 40 is held by the bearing holding portion 26 of the motor housing 24.
  • a plurality of intake holes 26D are formed through the bearing holding portion 26, and the inside and the outside of the motor housing 24 are communicated with each other by the intake holes 26D. Then, a part of the rear motor bearing 45 is exposed to the air inflow path 26E side inside the intake hole 26D. As a result, the rear motor bearing 45 can be cooled by the air flow AR1 (see FIG. 5) that flows into the motor housing 24 from the intake hole 26D.
  • the bearing holding portion 26 is formed in a bottomed cylindrical shape that is open to the front side.
  • the inside of the bearing holding portion 26 is configured as a bearing accommodating portion 26C for accommodating the rear motor bearing 45.
  • a plurality of intake holes 26D are formed through the side wall 26B of the bearing holding portion 26 in the front-rear direction, and a communication groove 26F that communicates the air inflow passage 26E and the bearing accommodating portion 26C is formed. Therefore, with a simple configuration, a part of the rear motor bearing 45 can be exposed to the air inflow path 26E side of the intake hole 26D.
  • a plurality of intake holes 26D are formed in the circumferential direction of the bearing holding portion 26, and communication grooves 26F are formed inside every other intake hole 26D of the intake holes 26D arranged in the circumferential direction in the radial direction. .. Specifically, it is formed inside the first intake hole 26D1 in the intake hole 26D in the radial direction.
  • the bearing holding portion 26 can be cooled by AR1. As a result, for example, it is possible to suppress the thermal expansion of the bearing holding portion 26 when the vibration drill 10 is operated. Therefore, the rear motor bearing 45 can be cooled while maintaining a good holding state of the bearing holding portion 26 on the rear motor bearing 45.
  • the communication groove 26F is open to the front side, and the bottom portion of the communication groove 26F is arranged in the front-rear direction intermediate portion (axial direction intermediate portion) of the side wall 26B. Therefore, while a part of the front part of the rear side motor bearing 45 is exposed to the air inflow path 26E side by the communication groove 26F, the rear part of the rear side motor bearing 45 is held by the side wall 26B over the entire circumference in the circumferential direction. be able to. As a result, the rear motor bearing 45 can be cooled while maintaining the holding state of the bearing holding portion 26 on the rear motor bearing 45 even better.
  • a dust seal 80 is provided on the front side of the rear motor bearing 45, and the rear motor bearing 45 is covered from the front side by the dust seal 80. Further, the rear motor bearing 45 is covered from the rear side by the bottom wall 26A of the bearing holding portion 26. As a result, the rear motor bearing 45 is sealed from both sides in the axial direction by the dust seal 80 and the bearing holding portion 26. Therefore, the rear motor bearing 45 can be cooled while ensuring the dust resistance of the rear motor bearing 45.
  • the dust seal 80 is provided so as to be integrally rotatable on the rotating shaft 41 of the motor 40. Therefore, the rotation of the rotating shaft 41 can generate an air flow AR2 that goes outward in the radial direction of the dust seal 80.
  • the dust in the air flow AR1 is removed by the air flow AR2 in the radial direction of the rear motor bearing 45 (rear motor bearing 45). It can fly in the direction away from. Therefore, the rear motor bearing 45 can be cooled while improving the dust resistance of the rear motor bearing 45.
  • a blade portion 80A is formed in the dust seal 80, and the blade portion 80A generates an air flow AR2 directed outward in the radial direction of the rotating shaft 41.
  • the dust in the air flow AR1 can be effectively blown outward in the radial direction by the air flow AR2. Therefore, the rear motor bearing 45 can be cooled while effectively improving the dust resistance of the rear motor bearing 45.
  • a fan 47 is provided on the front end side portion of the rotating shaft 41 so as to be integrally rotatable, and the fan 47 is configured as a centrifugal fan.
  • the housing 20 is formed with an exhaust hole 31A on the outer side in the radial direction of the fan 47.
  • the housing 20 includes a motor housing 24 for accommodating the motor 40 and a handle housing 22 having a pair of cover members 23 for sandwiching the motor housing 24 from the left-right direction.
  • the bearing holding portion 26 is formed in the motor housing 24, and the handle housing 22 is formed with an exposed hole 22B for exposing the bearing holding portion 26. Therefore, the motor housing 24 can be connected to the handle housing 22 in a unit state in which the motor 40 is assembled to the motor housing 24. Thereby, the assembling property of the vibration drill 10 can be improved.
  • the bearing accommodating portion 26C and the air inflow passage 26E are communicated with each other by the communication groove 26F.
  • a hole may be formed in the bearing holding portion 26 so that the bearing accommodating portion 26C and the air inflow passage 26E communicate with each other.
  • the bottom of the communication groove 26F of the bearing holding portion 26 is arranged in the middle portion in the front-rear direction of the side wall 26B, but the bottom of the communication groove 26F of the bearing holding portion 26 is the bottom of the bearing holding portion 26.
  • the groove depth of the communication groove 26F may be deepened by extending to the bottom wall 26A.
  • the communication groove 26F is formed inside the first intake hole 26D1 in the intake hole 26D in the radial direction, but the communication groove 26F communicates inside the first intake hole 26D1 and the second intake hole 26D2 in the radial direction.
  • the groove 26F may be formed.
  • the dust seal 80 is provided so as to be integrally rotatable with the rotating shaft 41 of the motor 40, but the dust seal 80 may be fixed to the motor housing 24.
  • the blade portion 80A is formed on the dust seal 80, but the blade portion 80A may be omitted in the dust seal 80.
  • Vibration drill power tool
  • 20 Housing, 22 ... Handle housing, 22B ... Exposed hole, 23 ... Cover member, 24

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Drilling And Boring (AREA)
PCT/JP2021/016541 2020-04-28 2021-04-23 動力工具 Ceased WO2021220993A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2022518041A JP7464112B2 (ja) 2020-04-28 2021-04-23 動力工具

Applications Claiming Priority (2)

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JP2020078958 2020-04-28
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JP2002101614A (ja) * 2000-09-26 2002-04-05 Matsushita Electric Works Ltd モータ及びこれを備えた電動工具
JP2002321172A (ja) * 2001-04-20 2002-11-05 Hitachi Koki Co Ltd 電動工具
JP2006167843A (ja) * 2004-12-14 2006-06-29 Ryobi Ltd 電動工具
US7308950B2 (en) * 2002-02-08 2007-12-18 Black & Decker Inc. Drilling and/or hammering tool
WO2016076143A1 (ja) * 2014-11-13 2016-05-19 Ntn株式会社 転がり軸受
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JP2019038093A (ja) * 2017-08-29 2019-03-14 株式会社マキタ 作業工具

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JPS6015419Y2 (ja) * 1970-10-01 1985-05-15 ザ・ブラツク・アンド・デツカ−・マニユフアクチユアリング・カンパニ− ベアリング及びハウジングの構造
JPS4859941U (https=) * 1971-11-12 1973-07-30
JPS5790925U (https=) * 1980-11-26 1982-06-04
JP2002101614A (ja) * 2000-09-26 2002-04-05 Matsushita Electric Works Ltd モータ及びこれを備えた電動工具
JP2002321172A (ja) * 2001-04-20 2002-11-05 Hitachi Koki Co Ltd 電動工具
US7308950B2 (en) * 2002-02-08 2007-12-18 Black & Decker Inc. Drilling and/or hammering tool
JP2006167843A (ja) * 2004-12-14 2006-06-29 Ryobi Ltd 電動工具
WO2016076143A1 (ja) * 2014-11-13 2016-05-19 Ntn株式会社 転がり軸受
WO2018179587A1 (ja) * 2017-03-31 2018-10-04 パナソニックＩｐマネジメント株式会社 電動工具
JP2019038093A (ja) * 2017-08-29 2019-03-14 株式会社マキタ 作業工具

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