WO2021100703A1 - Electric tool - Google Patents

Electric tool Download PDF

Info

Publication number
WO2021100703A1
WO2021100703A1 PCT/JP2020/042795 JP2020042795W WO2021100703A1 WO 2021100703 A1 WO2021100703 A1 WO 2021100703A1 JP 2020042795 W JP2020042795 W JP 2020042795W WO 2021100703 A1 WO2021100703 A1 WO 2021100703A1
Authority
WO
WIPO (PCT)
Prior art keywords
linear motor
accommodating portion
housing
drive shaft
air
Prior art date
Application number
PCT/JP2020/042795
Other languages
French (fr)
Japanese (ja)
Inventor
剛成 佐藤
勇佑 橘
Original Assignee
京セラインダストリアルツールズ株式会社
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 京セラインダストリアルツールズ株式会社 filed Critical 京セラインダストリアルツールズ株式会社
Priority to JP2021558393A priority Critical patent/JP7325530B2/en
Publication of WO2021100703A1 publication Critical patent/WO2021100703A1/en

Links

Images

Classifications

    • 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

  • This disclosure relates to power tools.
  • Patent Document 1 describes a technique related to a power tool.
  • the power tool comprises a first linear motor that reciprocates the tip tool, a housing, and a tuned mass damper.
  • the housing houses the first linear motor.
  • the tuned mass damper absorbs the vibration generated in the housing.
  • FIG. 1 is a schematic side view showing an example of the power tool 1.
  • the power tool 1 is, for example, a hand-held reciprocating saw.
  • an AC power supply is supplied to the power tool 1.
  • the power tool 1 operates based on the supplied AC power supply.
  • the electric tool 1 includes a mounting portion 2 to which a tip tool is mounted and a housing 3 that accommodates a linear motor or the like that reciprocates the mounting portion 2.
  • the housing 3 is gripped by the user.
  • the tip tool can be attached to and detached from the mounting portion 2, for example.
  • the tip tool 4 is an elongated blade. Reciprocating saw blades are also called saw blades or blades.
  • FIG. 2 is a schematic side view showing a state in which the tip tool 4 is attached to the attachment portion 2.
  • the power tool 1 will be described with reference to the front side, the rear side, the upper side, and the lower side shown in FIG.
  • the tip tool 4 side of the power tool 1 is the front side, and the opposite side is the rear side.
  • the tip tool 4 reciprocates by reciprocating the mounting portion 2 by the linear motor in the housing 3.
  • the tip tool 4 reciprocates in the front-back direction.
  • the power tool 1 can perform machining such as cutting on a work by a tip tool 4 that reciprocates.
  • the power tool 1 includes a work holder 5 for holding the work and a fixing portion 6 for fixing the work holder 5.
  • the housing 3 has, for example, a long shape along one direction.
  • the fixing portion 6 is provided at the front end of the housing 3.
  • the work holder 5 and the mounting portion 2 extend forward from the fixing portion 6.
  • the power tool 1 includes a trigger switch 7, a lock button 8, and a power cable 9.
  • the trigger switch 7 and the lock button 8 are provided on the housing 3 so as to be exposed from the housing 3.
  • the trigger switch 7 is a switch for operating the power tool 1.
  • the lock button 8 is a button for continuously operating the power tool 1.
  • the power cable 9 is a cable that transmits AC power.
  • the power cable 9 is connected to, for example, an outlet that outputs commercial power.
  • FIG. 3 is a schematic side view showing an example of the inside of the housing 3.
  • the housing 3 can be divided into two, for example.
  • the inside of the housing 3 can be seen by removing one of the two divided parts constituting the housing 3.
  • FIG. 4 is a diagram showing an outline of a cross-sectional structure of the structure shown in FIG. 3 in arrow view AA.
  • FIG. 5 is a diagram showing an outline of a cross-sectional structure of the structure shown in FIG. 3 in arrow view BB.
  • the electric tool 1 includes a plurality of linear motors 10, a drive shaft 11 driven by the plurality of linear motors 10, an auxiliary mechanism 12, and a dynamic vibration absorber 13.
  • the plurality of linear motors 10, the drive shaft 11, the auxiliary mechanism 12, and the dynamic vibration absorber 13 are housed in the housing 3.
  • the drive shaft 11 extends along the front-rear direction.
  • the front end of the drive shaft 11 is fixed to the mounting portion 2.
  • the plurality of linear motors 10 can reciprocate the drive shaft 11.
  • the reciprocating motion of the drive shaft 11 causes the mounting portion 2 to reciprocate.
  • the tip tool 4 reciprocates.
  • each linear motor 10 reciprocates the mounting portion 2 via the drive shaft 11.
  • each linear motor 10 reciprocates the tip tool 4 via the drive shaft 11 and the mounting portion 2.
  • the auxiliary mechanism 12 assists the reciprocating motion of the tip tool 4 by the linear motor 10 by utilizing the resonance caused by the spring.
  • the Tuned Mass Damper 13 suppresses the vibration of the housing 3.
  • the drive shaft 11, the mounting portion 2, and the tip tool 4 driven by the linear motor 10 may be collectively referred to as a drive object.
  • the linear motor 10 reciprocates the object to be driven.
  • the power tool 1 includes, for example, two linear motors 10.
  • One linear motor 10 is housed in, for example, the front side portion of the housing 3.
  • the other linear motor 10 is housed in, for example, a rear portion of the housing 3.
  • the linear motor 10 on the front side may be referred to as a linear motor 10A.
  • the linear motor 10 on the rear side may be referred to as a linear motor 10B.
  • the housing 3 includes a grip portion 300 that is gripped by the user.
  • the grip portion 300 has a substantially tubular shape.
  • the grip portion 300 extends in the front-rear direction.
  • the auxiliary mechanism 12 and the dynamic vibration absorber 13 are housed in, for example, the grip portion 300.
  • the auxiliary mechanism 12 and the dynamic vibration absorber 13 are arranged in a direction orthogonal to the front-rear direction.
  • the auxiliary mechanism 12 and the dynamic vibration absorber 13 are arranged in the vertical direction, but the arrangement of the auxiliary mechanism 12 and the dynamic vibration absorber 13 is not limited to this.
  • the auxiliary mechanism 12 and the dynamic vibration absorber 13 may be arranged in the left-right direction orthogonal to the front-rear direction and the up-down direction.
  • the housing 3 includes an accommodating portion 310 for accommodating the linear motor 10A and an accommodating portion 320 accommodating the linear motor 10B.
  • the accommodating portion 310 is located on the front side of the grip portion 300.
  • the linear motor 10A is located on the front side of the grip portion 300.
  • the linear motor 10A is located on the front side of the auxiliary mechanism 12 and the dynamic vibration absorber 13.
  • the accommodating portion 320 is located behind the grip portion 300.
  • the linear motor 10B is located on the rear side of the grip portion 300.
  • the linear motor 10B is located behind the auxiliary mechanism 12 and the dynamic vibration absorber 13.
  • Each linear motor 10 includes a stator 100 and a mover 110.
  • the stator 100 is fixed in the housing 3.
  • the mover 110 can reciprocate along the front-rear direction.
  • the mover 110 is fixed to the drive shaft 11.
  • the drive shaft 11 reciprocates in conjunction with the reciprocating motion of the mover 110.
  • the stator 100 includes a core 101 and a plurality of coils 102 wound around the core 101.
  • the coil 102 is schematically shown.
  • the core 101 includes a frame-shaped portion 101a and two teeth 101b (see FIG. 5) protruding from the inside of the frame-shaped portion 101a so as to face each other.
  • the two teeth 101b face each other in the vertical direction.
  • Two coils 102 are wound around each tooth 101b.
  • the stator 100 includes four coils 102.
  • the coil 102 is wound around the teeth 101b via the insulating member 103.
  • An insulating member 103 exists between the two coils 102 wound around one tooth 101b.
  • Two coils 102 wound around one tooth 101b are connected in parallel. Further, the four coils 102 included in the stator 100 are connected in parallel.
  • the winding direction of the two coils 102 wound around the upper teeth 101b is opposite to the winding direction of the two coils 102 wound around the lower teeth 101b.
  • the magnetic pole generated on the upper teeth 101b is the opposite magnetic pole of the magnetic pole generated on the lower teeth 101b.
  • the mover 110 is located between two teeth 101b facing each other.
  • the mover 110 includes two magnets 111 and a spacer 112 located between the two magnets 111.
  • the two magnets 111 and the spacer 112 are aligned in the front-rear direction and are fixed to the drive shaft 11.
  • the magnetic pole at the upper end of the front magnet 111 is the opposite of the magnetic pole at the lower end of the front magnet 111.
  • the magnetic pole at the upper end of the magnet 111 on the rear side is the opposite of the magnetic pole at the lower end of the magnet 111 on the rear side.
  • the magnetic pole at the upper end of the front magnet 111 is the opposite of the magnetic pole at the upper end of the rear magnet 111.
  • the magnetic pole at the lower end of the front magnet 111 is the opposite of the magnetic pole at the lower end of the rear magnet 111.
  • An insulating member 103 exists between the coil 102 on the mover 110 side of the two coils 102 wound around the teeth 101b and each magnet 111 of the mover 110.
  • the mover 110 does not have to include the spacer 112. In this case, the two magnets 111 may be located adjacent to each other.
  • FIGS. 6 and 7 are diagrams for explaining an example of the operation of the linear motor 10.
  • the description of the frame-shaped portion 101a of the core 101 and the insulating member 103 is omitted for convenience of explanation.
  • the magnetic poles at the upper end and the lower end of the front magnet 111 are S pole and N pole, respectively. Further, the magnetic poles of the upper end portion and the lower end portion of the magnet 111 on the rear side are N pole and S pole, respectively.
  • the magnetic poles of the upper and lower teeth 101b are set to the S pole and the N pole, respectively, as shown in FIG.
  • the upper end of the front magnet 111 and the upper teeth 101b repel each other, while the upper end of the rear magnet 111 and the upper teeth 101b attract each other.
  • the lower end of the front magnet 111 and the lower teeth 101b repel each other, while the lower end of the rear magnet 111 and the lower teeth 101b attract each other.
  • the mover 110 moves to the front side, and the drive shaft 11 moves to the front side accordingly.
  • the mover 110 of each linear motor 10 reciprocates in the front-rear direction, so that the drive shaft 11, the mounting portion 2, and the tip tool 4 reciprocate in the front-rear direction. That is, the mover 110 of each linear motor 10 reciprocates in the front-rear direction, so that the object to be driven reciprocates in the front-rear direction.
  • the mover 110 and the driving object may be collectively referred to as a reciprocating motion body.
  • a conversion mechanism such as a cam that converts the rotary motion into a reciprocating motion is unnecessary as compared with the case where the rotary motor is used.
  • a reduction mechanism such as a gear is not required. Noise may be generated from the conversion mechanism and the deceleration mechanism. In this example, since the conversion mechanism and the deceleration mechanism are unnecessary, the noise of the power tool 1 can be reduced.
  • auxiliary mechanism 12 ⁇ Configuration example of auxiliary mechanism> Next, a configuration example of the auxiliary mechanism 12 will be described.
  • the configuration described below is an example, and the configuration of the auxiliary mechanism 12 is not limited to the following example.
  • the auxiliary mechanism 12 includes two springs 121 and a holding portion 120 that holds one end of the two springs 121.
  • the holding portion 120 is fixed to the drive shaft 11.
  • Each spring 121 is, for example, a compression coil spring.
  • the holding portion 120 and the two springs 121 are arranged along the front-rear direction.
  • One spring 121 is located on the front side of the holding portion 120, and the other spring 121 is located on the rear side of the holding portion 120.
  • Each spring 121 can be extended in the front-rear direction.
  • the drive shaft 11 passes through the inside of each spring 121.
  • each spring 121 moves according to the movement of the holding portion 120.
  • the other end of each spring 121 is indirectly or directly fixed to the housing 3.
  • the auxiliary mechanism 12 includes, for each spring 121, a holding member 122 that holds the other end of the spring 121.
  • the auxiliary mechanism 12 includes a fixing portion 123 for fixing the holding member 122 to the grip portion 300 for each holding member 122.
  • the fixing portion 123 may be formed integrally with the housing 3 or may be a separate body from the housing 3.
  • Each of the holding member 122 and the fixing portion 123 has a through hole penetrating in the front-rear direction.
  • each spring 121 may be a free end or a fixed end. That is, the two ends of each spring 121 may both be free ends or both may be fixed ends. Further, one of the two ends of each spring 121 may be a free end, and the other of the two ends may be a fixed end.
  • the holding portion 120 Since the holding portion 120 is fixed to the drive shaft 11, it moves together with the drive shaft 11.
  • the two springs 121 are housed in the grip 300 in a state slightly shorter than the natural length. That is, the initial state of each spring 121 is a slightly compressed state.
  • the spring 121 on the front side expands from the initial state, and the spring 121 on the rear side compresses from the initial state.
  • a force in the forward direction is applied to the holding portion 120 and the drive shaft 11.
  • the spring 121 on the front side compresses from the initial state, and the spring 121 on the rear side expands from the initial state.
  • a force in the rear direction is applied to the holding portion 120 and the drive shaft 11.
  • the holding portion 120 and the drive shaft 11 can vibrate in the front-rear direction by the action of the spring 121. It can be said that the vibration in the front-back direction is a reciprocating motion in the front-back direction.
  • the holding portion 120 and the drive shaft 11 may vibrate in the front-rear direction even by the force from the linear motor 10. It is possible.
  • the spring 121 so that the vibrations of the holding portion 120 and the driving shaft 11 resonate when a force from the linear motor 10 is applied to the holding portion 120 and the driving shaft 11 vibrating by the spring 121.
  • the spring constant etc. of is set appropriately.
  • the auxiliary mechanism 12 can assist the reciprocating motion of the holding portion 120 and the drive shaft 11 by the linear motor 10 by utilizing the resonance caused by the spring 121.
  • the auxiliary mechanism 12 can assist the reciprocating motion of the mounting portion 2 and the tip tool 4 by the linear motor 10 by utilizing the resonance caused by the spring 121. Therefore, the electric power required to drive the linear motor 10 can be reduced. As a result, the power consumption of the power tool 1 can be reduced.
  • the heat generation of the linear motor 10 can be reduced.
  • the linear motor 10, the drive object including the drive shaft 11 and the like driven by the linear motor 10, and the auxiliary mechanism 12 constitute a linear resonance actuator.
  • the auxiliary mechanism 12 does not have to include one of the two springs 121. Further, the arrangement location of the auxiliary mechanism 12 in the housing 3 is not limited to the above example.
  • the dynamic vibration absorber 13 includes, for example, a mass body 130 and two springs 131 for moving the mass body 130.
  • the mass body 130 and the two springs 131 are aligned in the front-rear direction.
  • One spring 131 is located on the front side of the mass body 130, and the other spring 131 is located on the rear side of the mass body 130.
  • Each spring 131 can expand and contract along the front-rear direction.
  • the Tuned Mass Damper 13 includes, for each spring 131, a holding member 132 that holds the other end of the spring 131.
  • the dynamic vibration absorber 13 includes a fixing portion 133 for fixing the holding member 132 to the grip portion 300 for each holding member 132.
  • the other end of each spring 131 is indirectly fixed to the housing 3.
  • the end of each spring 131 may be a free end or a fixed end. That is, the two ends of each spring 131 may both be free ends or both may be fixed ends. Further, one of the two ends of each spring 131 may be a free end, and the other of the two ends may be a fixed end.
  • the Tuned Mass Damper 13 is configured such that the mass body 130 vibrates in a phase opposite to the vibration of the reciprocating motion (in other words, the reciprocating motion).
  • the dynamic vibration absorber 13 can absorb the vibration generated in the housing 3 due to the vibration of the reciprocating motion body. Therefore, the vibration of the housing 3 gripped by the user can be reduced. As a result, the operability of the power tool 1 is improved.
  • the location of the Tuned Mass Damper 13 in the housing 3 is not limited to the above example.
  • the power tool 1 has a cooling mechanism for cooling the linear motor 10.
  • the cooling mechanism includes a plurality of check valves 140 to 143 and an air pressure increasing / decreasing unit 150.
  • the check valves 140 and 141 are provided in the accommodating portion 310 in which the linear motor 10A is accommodated.
  • the check valves 142 and 143 are provided in the accommodating portion 320 in which the linear motor 10B is accommodated.
  • the air pressure increase / decrease unit 150 can increase / decrease the air pressure in the accommodating units 310 and 320.
  • the check valve 140 can take in the air outside the housing 3 into the accommodating portion 310. On the other hand, the check valve 140 cannot exhaust air into the accommodating portion 310 to the outside of the housing 3.
  • the check valve 141 can exhaust the air inside the accommodating portion 310 to the outside of the housing 3. On the other hand, the check valve 141 cannot take in the air outside the housing 3 into the accommodating portion 310.
  • the check valve 140 is located above the linear motor 10A, for example.
  • the check valve 141 is located, for example, below the linear motor 10A.
  • the check valve 140, the linear motor 10A, and the check valve 141 are arranged in the vertical direction.
  • the check valve 142 can take in the air outside the housing 3 into the accommodating portion 320. On the other hand, the check valve 142 cannot exhaust air into the accommodating portion 320 to the outside of the housing 3.
  • the check valve 143 can exhaust the air inside the accommodating portion 320 to the outside of the housing 3. On the other hand, the check valve 143 cannot take in the air outside the housing 3 into the accommodating portion 320.
  • the check valve 142 is located above the linear motor 10B, for example.
  • the check valve 143 is located, for example, below the linear motor 10B.
  • the check valve 142, the linear motor 10B, and the check valve 143 are arranged in the vertical direction.
  • the air pressure increase / decrease portion 150 is housed in, for example, the rear end portion of the grip portion 300.
  • the air pressure increasing / decreasing unit 150 includes, for example, a tubular portion 151.
  • the tubular portion 151 is open in the front-rear direction.
  • the drive shaft 11 passes through the inside of the tubular portion 151.
  • the air pressure increasing / decreasing section 150 includes a first partition section 152 and a second partition section 153.
  • the first partition portion 152 and the second partition portion 153 divide the front space on the front side of the air pressure increase / decrease unit 150 and the rear space on the rear side of the air pressure increase / decrease unit 150 in the housing 3.
  • the accommodating portion 310 and the accommodating portion 320 are separated by the first partition portion 152 and the second partition portion 153.
  • the first partition portion 152 has, for example, a flange shape.
  • the first partition portion 152 is projected from the outer peripheral surface so as to surround the outer peripheral surface of the tubular portion 151.
  • the first partition portion 152 is fixed to the inner peripheral surface of the grip portion 300 so as to follow the circumferential direction thereof.
  • the second partition portion 153 is located inside the tubular portion 151, and divides the space inside the tubular portion 151 into two in the front-rear direction.
  • the second partition portion 153 includes, for example, a plate-shaped portion 153a and an O-ring 153b.
  • the plate-shaped portion 153a is fixed to the drive shaft 11 inside the tubular portion 151.
  • a groove is formed once on the side surface of the plate-shaped portion 153a. By fitting the O-ring 153b into this groove, the second partition portion 153 comes into close contact with the inner peripheral surface of the tubular portion 151.
  • the air pressure increase / decrease unit 150 increases / decreases the air pressure in the front space and the air pressure in the rear space in conjunction with the reciprocating motion of the driving object.
  • the check valve 140 takes in air into the accommodating portion 310 when the air pressure in the accommodating portion 310 decreases, and the check valve 141 takes in the air in the accommodating portion 310 when the air pressure in the accommodating portion 310 increases.
  • the linear motor 10A in the accommodating portion 310 is cooled.
  • the air pressure in the accommodating portion 310 increases or decreases in conjunction with the reciprocating motion of the second partition portion 153, the intake air by the check valve 140 and the exhaust air by the check valve 141 are alternately and continuously performed. Will be.
  • the air taken into the accommodating portion 310 from the upper side of the accommodating portion 310 hits the linear motor 10A as cooling air, and then is discharged from the lower side of the accommodating portion 310. It is repeatedly executed to cool the linear motor 10A.
  • the check valve 142 takes in air into the accommodating portion 330, and when the air pressure in the accommodating portion 320 increases, the check valve 143 exhausts the air in the accommodating portion 320. By doing so, the linear motor 10B in the accommodating portion 320 is cooled.
  • the air pressure in the accommodating portion 320 increases or decreases in conjunction with the reciprocating motion of the second partition portion 153, the intake air by the check valve 142 and the exhaust air by the check valve 143 are alternately and continuously performed. Will be.
  • the air taken into the accommodating portion 320 from the upper side of the accommodating portion 320 hits the linear motor 10B as cooling air, and then is discharged from the lower side of the accommodating portion 320. It is repeatedly executed to cool the linear motor 10B.
  • the air pressure increasing / decreasing unit 150 may be provided behind the linear motor 10B.
  • the air pressure in the accommodating portions 310 and 320 located on the front side of the air pressure increasing / decreasing portion 150 decreases.
  • the check valve 140 takes in air into the accommodating portion 310
  • the check valve 142 takes in air into the accommodating portion 320.
  • the air pressure in the accommodating portions 310 and 320 increases.
  • the check valve 141 exhausts the air in the accommodating portion 310
  • the check valve 143 exhausts the air in the accommodating portion 320.
  • the air pressure increase / decrease unit 150 may be provided on the front side of the linear motor 10A.
  • the air pressure in the accommodating portions 310 and 320 is increased or decreased by the reciprocating motion of the second partition portion 153 in conjunction with the reciprocating motion of the drive shaft 11. Then, as the air pressure in the accommodating portions 310 and 320 increases or decreases, cooling air for cooling the linear motor 10 flows through the accommodating portions 310 and 320. As a result, the linear motor 10 can be cooled by reciprocating the drive shaft 11 by the linear motor 10. Therefore, the linear motor 10 can be cooled with a simple configuration.
  • the power tool 1 of this example includes a plurality of electric wires 20.
  • the plurality of electric wires 20 include electric wires 20a to 20e.
  • FIG. 8 is a diagram showing an arrangement example of the electric wires 20a to 20e. In FIG. 8, the power tool 1 is schematically shown.
  • each of the two linear motors 10 includes four coils 102. Therefore, the power tool 1 includes a total of eight coils 102. The eight coils 102 are connected in parallel, for example.
  • the power cable 9 includes electric wires 20a and 20b.
  • the electric wire 20a transmits an AC voltage of one phase of the AC power supply.
  • the wire 20b transmits the AC voltage of the other phase of the AC power supply.
  • the electric wire 20a is connected to, for example, one end of each coil 102 of the rear linear motor 10B.
  • the electric wire 20b is connected to, for example, one end of the switch circuit 70 of the trigger switch 7.
  • the electric wire 20b is connected to the switch circuit 70 through the accommodating portion 320 and the grip portion 300.
  • the switch circuit 70 is located, for example, in the grip portion 300.
  • the electric wire 20c connects the other end of the switch circuit 70 to one end of each coil 102 of the linear motor 10A.
  • the electric wire 20c is connected to one end of each coil of the linear motor 10A from the switch circuit 70 through the accommodating portion 310.
  • the electric wire 20d connects one end of each coil 102 of the linear motor 10A and the other end of each coil 102 of the linear motor 10B.
  • the electric wire 20d is connected to the other end of the coil 102 of the linear motor 10B from one end of the coil 102 of the linear motor 10A through the accommodating portion 310, the grip portion 300, and the accommodating portion 320 in this order.
  • the electric wire 20e connects the other end of each coil 102 of the linear motor 10A and one end of each coil 102 of the linear motor 10B.
  • the electric wire 20e is connected to one end of the coil 102 of the linear motor 10B from the other end of the coil 102 of the linear motor 10A through the accommodating portion 310, the grip portion 300, and the accommodating portion 320 in this order.
  • the electric wires 20b, 20e, and 20d are collectively passed through, for example, a groove provided on the inner peripheral surface of the grip portion 300. As a result, the electric wires 20b, 20e, and 20d are fixed to the grip portion 300.
  • the method of fixing the electric wires 20b, 20e, and 20d to the grip portion 300 is not limited to this.
  • the number of electric wires 20 included in the power tool 1 is not limited to the above example.
  • the connection method between the configurations by the electric wire 20 is not limited to the above example.
  • the electric wire 20a of the power cable 9 may be directly connected to the other end of each coil 102 of the linear motor 10A.
  • the electric wire 20a passes through the accommodating portion 320, the grip portion 300, and the accommodating portion 310 in this order, and is connected to the other end of the coil 102 of the linear motor 10A.
  • the method of connecting the eight coils 102 included in the power tool 1 is not limited to the above example.
  • the four coils 102 connected in parallel provided by the linear motor 10A and the four coils 102 connected in parallel provided by the linear motor 10B may be connected in series.
  • the power tool 1 includes a dynamic vibration absorber 13 that absorbs the vibration of the housing 3.
  • the vibration of the electric tool 1 can be suppressed even when a relatively heavy reciprocating motion body including the mover 110 of the linear motor 10 or the like performs the reciprocating motion. .. Therefore, the operability of the power tool 1 is improved.
  • the dynamic vibration absorber 13 is located in the grip portion 300 through which the drive shaft 11 passes.
  • the Tuned Mass Damper 13 can be arranged near the drive shaft 11 that performs the reciprocating motion that causes the vibration of the housing 3. Therefore, the Tuned Mass Damper 13 can more appropriately absorb the vibration of the housing 3.
  • the linear motor 10A since the linear motor 10A is located closer to the tip tool 4 than the grip portion 300, it becomes easy to transmit the force from the linear motor 10A to the tip tool 4. Therefore, the linear motor 10A can efficiently reciprocate the tip tool 4.
  • the electric tool 1 since the electric tool 1 includes a plurality of linear motors 10, the performance of the electric tool 1 can be improved.
  • linear motors 10 are provided before and after the grip portion 300.
  • the distance between the hand of the user holding the grip portion 300 and the tip tool 4 can be reduced as compared with the case where the linear motors 10A and 10B are both provided on the front side of the grip portion 300. Therefore, the operability of the power tool 1 is improved.
  • the auxiliary mechanism 12 that assists the reciprocating motion of the driven object by the linear motor 10 is located in the grip portion 300 that is gripped by the user's hand. This makes it easier for the user to hold the power tool 1. Therefore, the operability of the power tool 1 is improved.
  • the dynamic vibration absorber 13 is located in the grip portion 300 gripped by the user. This makes it easier for the user to hold the power tool 1. Therefore, the operability of the power tool 1 is improved.
  • the power tool 1 can appropriately cool the linear motor 10 by using the check valves 140 to 143 and the air pressure increase / decrease unit 150.
  • a cooling fan can be attached to the motor shaft to rotate the cooling fan in conjunction with the rotation of the motor shaft.
  • the same configuration as that of the rotary motor cannot be adopted.
  • the housing 3 can be divided into two, but the configuration of the housing 3 is not limited to this.
  • the grip portion 300, the accommodating portion 310, and the accommodating portion 320 may be formed as separate bodies.
  • the grip portion 300 and the accommodating portions 310 and 320 may be connected by a fixing member 990 or the like.
  • the electric tool 1 includes two linear motors 10, one linear motor 10 may be provided, or three or more linear motors 10 may be provided.
  • FIG. 10 is a diagram showing an example of the configuration of the power tool 1 in this case.
  • FIG. 10 shows an example of the inside of the housing 3 as in FIG. 3 described above.
  • FIG. 11 is a diagram showing an outline of a cross-sectional structure of the structure shown in FIG. 10 in arrow CC.
  • the housing 3 includes an accommodating portion 330 accommodating the tuned mass damper 53.
  • the accommodating portion 330 is adjacent to the accommodating portion 320 behind the accommodating portion 320.
  • the accommodating portion 310, the grip portion 300, the accommodating portion 320, and the accommodating portion 330 are arranged in the front-rear direction.
  • the housing 3 shown in FIGS. 10 and 11 has a shape in which the accommodating portion 330 is attached to the rear surface (the rear surface of the accommodating portion 320) of the housing 3 shown in FIG. 1 and the like.
  • the Tuned Mass Damper 53 includes a mass body 530 and two springs 531 for moving the mass body 530, similarly to the above-mentioned Tuned Mass Damper 13.
  • the mass body 530 and the two springs 531 are arranged in the front-rear direction.
  • One spring 531 is located on the front side of the mass body 530, and the other spring 531 is located on the rear side of the mass body 530.
  • Each spring 531 can expand and contract along the front-rear direction.
  • One end of the two springs 531 is a free end, and is connected to both ends of the mass body 530 in the front-rear direction.
  • Each of the other ends of the two springs 531 is fixed to the housing 3 and serves as a fixed end. In this example, each of the other ends of the two springs 531 is fixed to the inner surface of the accommodating portion 330.
  • the Tuned Mass Damper 53 is located on the extension line of the drive shaft 11 that performs reciprocating motion on the rear side of the grip portion 300.
  • the two springs 531 and the mass body 530 of the dynamic vibration absorber 53 and the drive shaft 11 are aligned on a straight line.
  • the position of the Tuned Mass Damper 53 on the extension line of the drive shaft 11 means that the drive shaft 11 is extended in the longitudinal direction in the cross-sectional view of the power tool 1 along the longitudinal direction of the drive shaft 11. Overlaps with the Tuned Mass Damper 53.
  • the fact that the two springs 531 and the mass body 530 of the dynamic vibration absorber 53 and the drive shaft 11 are aligned in a straight line means that the drive shaft 11 is aligned in a straight line in the cross-sectional view of the power tool 1 along the longitudinal direction of the drive shaft 11. It means that the drive shaft 11 overlaps with the two springs 531 and the mass body 530 when the 11 is extended in the longitudinal direction.
  • the Tuned Mass Damper 53 is configured such that the mass body 530 vibrates in a phase opposite to the vibration of the reciprocating motion body. As a result, the Tuned Mass Damper 53 can absorb the vibration generated in the housing 3 by the vibration of the reciprocating motion body. Therefore, the vibration of the housing 3 gripped by the user can be reduced.
  • the Tuned Mass Damper 53 is located on the extension line of the drive shaft 11 that performs reciprocating motion on the rear side of the grip portion 300.
  • the vibration generated in the housing 3 is more absorbed as compared with the case where the dynamic vibration absorber 13 is located in the grip portion 300. Therefore, the vibration of the housing 3 gripped by the user can be further reduced.
  • the power tool 1 may include a battery 80 that outputs a DC power supply.
  • FIG. 12 is a diagram showing an example of the configuration of the power tool 1 including the battery 80.
  • FIG. 12 shows an example of the inside of the housing 3 as in FIG. 3 described above.
  • the power tool 1 of this example is provided with a battery 80 instead of the power cable 9.
  • the battery 80 can be attached to and detached from, for example, a rear portion of the housing 3 (a rear portion of the accommodating portion 320).
  • the battery 80 includes, for example, a rechargeable secondary battery.
  • the battery 80 outputs a DC power supply.
  • the accommodating portion 320 of the housing 3 accommodates the driving unit 90 that drives the linear motors 10A and 10B based on the DC power supply output from the battery 80.
  • the drive unit 90 is located behind the grip unit 300.
  • the drive unit 90 includes, for example, a substrate 91 and a circuit configuration 92 formed on the substrate 91.
  • the circuit configuration 92 includes, for example, an inverter circuit that generates an AC power source based on a DC power source from the battery 80. The AC power generated in the circuit configuration 92 is supplied to the linear motors 10A and 10B.
  • Two electric wires 20f and 20g extend from the drive unit 90.
  • the electric wire 20f transmits the AC voltage of one phase of the AC power supply generated in the circuit configuration 92.
  • the electric wire 20f transmits the AC voltage of the other phase of the AC power supply.
  • the electric wire 20f is connected to one end of each coil 102 of the linear motor 10B (see FIG. 8).
  • an electric wire 20g is connected to one end of the switch circuit 70 (see FIG. 8).
  • FIG. 13 is a diagram showing another configuration example of the power tool 1 including the battery 80.
  • the power tool 1 does not include the linear motor 10B and the check valves 142 and 143.
  • the linear motor 10B is not housed in the housing unit 320, but the driving unit 90 is housed in the housing unit 320.
  • the battery 80 may be non-detachably fixed to the housing 3. Further, the battery 80 may include a non-rechargeable primary battery. Further, the mounting position of the battery 80 with respect to the housing 3 is not limited to the above example. Further, the battery 80 and the housing 3 may be connected by a cable.
  • the linear motor 10 may include heat radiation fins 95 attached to the coil 102.
  • FIG. 14 is a diagram showing a configuration example of a linear motor 10 provided with heat radiation fins 95.
  • the description of the frame-shaped portion 101a of the core 101 and the insulating member 103 is omitted.
  • heat radiation fins 95 are attached to each coil 102. Further, the heat radiation fin 95 is attached to the rear side of the coil 102.
  • the heat radiating fin 95 is made of a metal having high thermal conductivity, such as aluminum.
  • the heat radiating fin 95 is fixed to the coil 102 by, for example, an insulating adhesive having high thermal conductivity. The method of attaching the heat radiation fin 95 to the coil 102 is not limited to this.
  • FIG. 15 is a diagram showing an example of a state in which the heat radiation fin 95 and the coil 102 to which the heat radiation fin 95 is attached are viewed from the arrow D of FIG.
  • the heat radiating fin 95 includes a base material 95a and a plurality of fins 95b erected on one surface of the base material 95a.
  • the fin 95b can also be said to be a protrusion.
  • the fins 95b are shown with diagonal lines.
  • the base material 95a has, for example, a plate shape.
  • Each fin 95b has, for example, a long plate shape in one direction. In this example, each fin 95b has its longitudinal direction along the vertical direction.
  • the plurality of fins 95b are arranged at intervals along a direction orthogonal to the vertical direction.
  • the plurality of fins 95b are arranged at equal intervals, for example.
  • the plurality of fins 95b do not have to be arranged at equal intervals.
  • the heat radiating fins 95 are attached to the coil 102, the coil 102 that easily generates heat can be appropriately cooled.
  • the plurality of fins 95b are arranged at intervals along the direction orthogonal to the vertical direction. As a result, the flow of the cooling air that cools the linear motor 10 is less likely to be obstructed by the radiating fins 95.
  • the cooling air 900 for cooling the linear motor 10A is on the upper side. It flows downward from.
  • a plurality of fins 95b are arranged at intervals along a direction orthogonal to the vertical direction in which the cooling air 900 flows. This makes it easier for the cooling air 900 to pass between the fins 95b. Therefore, the flow of the cooling air 900 is less likely to be obstructed by the heat radiation fins 95. As a result, the cooling effect of the linear motor 10 by the cooling air is improved.
  • the shape of the heat radiation fin 95 is not limited to the above example. Further, the heat radiation fins 95 may be attached only to a part of the plurality of coils 102 included in the linear motor 10. That is, the heat radiation fin 95 may be attached to at least one of the plurality of coils 102 included in the linear motor 10. Further, the mounting position of the heat radiation fin 95 with respect to the coil 102 is not limited to the above example. For example, the heat radiation fin 95 may be attached to the front side of the coil 102. Further, a plurality of heat radiation fins 95 may be attached to one coil 102. For example, heat dissipation fins 95 may be attached to each of the front side and the rear side of one coil 102. Further, as shown in FIG. 16, insulating paper 995 may be arranged around each coil 102. Then, the heat radiating fins 95 may be arranged on the insulating paper 995.
  • the power tool 1 was a reciprocating saw, but it may be another hand-held power tool that reciprocates the tip tool.
  • the electric tool 1 may be an electric hammer, a jigsaw, or an electric saw.
  • the power tool 1 has been described in detail, but the above description is an example in all aspects, and the disclosure is not limited thereto.
  • the various examples described above can be applied in combination as long as they do not contradict each other. And it is understood that innumerable examples not illustrated can be assumed without departing from the scope of this disclosure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)

Abstract

This electric tool comprises a first linear motor that causes a distal-end tool to move in a reciprocating manner, a housing, and a dynamic vibration absorber. The housing accommodates the first linear motor. The dynamic vibration absorber absorbs vibration occurring in the housing.

Description

電動工具Electric tool 関連出願の相互参照Cross-reference of related applications
　本出願は、日本国出願２０１９－２０８６７４号（２０１９年１１月１９日出願）の優先権を主張するものであり、当該出願の開示全体を、ここに参照のために取り込む。 This application claims the priority of Japanese application No. 2019-208674 (filed on November 19, 2019), and the entire disclosure of the application is incorporated herein by reference.
　本開示は、電動工具に関する。 This disclosure relates to power tools.
　特許文献１には、電動工具に関する技術が記載されている。 Patent Document 1 describes a technique related to a power tool.
特開２００２－１４４２５５号公報JP-A-2002-144255
　電動工具が開示される。一の実施の形態では、電動工具は、先端工具を往復運動させる第１リニアモータと、ハウジングと、動吸振器とを備える。ハウジングは、第１リニアモータを収容する。動吸振器は、ハウジングに発生する振動を吸収する。 The power tool is disclosed. In one embodiment, the power tool comprises a first linear motor that reciprocates the tip tool, a housing, and a tuned mass damper. The housing houses the first linear motor. The tuned mass damper absorbs the vibration generated in the housing.
電動工具の一例を示す側面図である。It is a side view which shows an example of a power tool. 電動工具の一例を示す側面図である。It is a side view which shows an example of a power tool. 電動工具の一例を示す側面図である。It is a side view which shows an example of a power tool. 電動工具の一例を示す断面図である。It is sectional drawing which shows an example of an electric tool. 電動工具の一例を示す断面図である。It is sectional drawing which shows an example of an electric tool. リニアモータの動作の一例を説明するための図である。It is a figure for demonstrating an example of operation of a linear motor. リニアモータの動作の一例を説明するための図である。It is a figure for demonstrating an example of operation of a linear motor. 電線の配置例を示す図である。It is a figure which shows the arrangement example of an electric wire. ハウジングの構成例を示す図である。It is a figure which shows the structural example of a housing. 電動工具の一例を示す側面図である。It is a side view which shows an example of a power tool. 電動工具の一例を示す断面図である。It is sectional drawing which shows an example of an electric tool. 電動工具の一例を示す側面図である。It is a side view which shows an example of a power tool. 電動工具の一例を示す側面図である。It is a side view which shows an example of a power tool. リニアモータの一例を示す図である。It is a figure which shows an example of a linear motor. コイルと放熱フィン一例を示す図である。It is a figure which shows an example of a coil and a radiating fin. リニアモータの一例を示す図である。It is a figure which shows an example of a linear motor.
　図１は電動工具１の一例を示す概略側面図である。電動工具１は、例えば、手持ちのレシプロソーである。電動工具１には例えば交流電源が供給される。電動工具１は、供給される交流電源に基づいて動作を行う。 FIG. 1 is a schematic side view showing an example of the power tool 1. The power tool 1 is, for example, a hand-held reciprocating saw. For example, an AC power supply is supplied to the power tool 1. The power tool 1 operates based on the supplied AC power supply.
　図１に示されるように、電動工具１は、先端工具が取り付けられる取付部２と、取付部２を往復運動させるリニアモータ等を収容するハウジング３とを備える。ハウジング３はユーザによって把持される。先端工具は、例えば、取付部２に対して着脱可能である。本例では、電動工具１はレシプロソーであることから、先端工具４は細長い刃物である。レシプロソーの刃物は、鋸刃あるいはブレードとも呼ばれる。図２は、取付部２に先端工具４を取り付けた様子を示す概略側面図である。以後、図１に示される前側、後ろ側、上側及び下側を用いて電動工具１について説明する。電動工具１の先端工具４側が前側となり、それとは反対側が後ろ側となる。 As shown in FIG. 1, the electric tool 1 includes a mounting portion 2 to which a tip tool is mounted and a housing 3 that accommodates a linear motor or the like that reciprocates the mounting portion 2. The housing 3 is gripped by the user. The tip tool can be attached to and detached from the mounting portion 2, for example. In this example, since the power tool 1 is a reciprocating saw, the tip tool 4 is an elongated blade. Reciprocating saw blades are also called saw blades or blades. FIG. 2 is a schematic side view showing a state in which the tip tool 4 is attached to the attachment portion 2. Hereinafter, the power tool 1 will be described with reference to the front side, the rear side, the upper side, and the lower side shown in FIG. The tip tool 4 side of the power tool 1 is the front side, and the opposite side is the rear side.
　電動工具１では、ハウジング３内のリニアモータによって取付部２が往復運動させられることによって、先端工具４が往復運動する。先端工具４は前後方向に往復運動を行う。電動工具１は、往復運動する先端工具４によって、ワークに対して切断等の加工を行うことが可能である。 In the electric tool 1, the tip tool 4 reciprocates by reciprocating the mounting portion 2 by the linear motor in the housing 3. The tip tool 4 reciprocates in the front-back direction. The power tool 1 can perform machining such as cutting on a work by a tip tool 4 that reciprocates.
　電動工具１は、ワークを保持するワークホルダ５と、ワークホルダ５が固定される固定部６とを備える。ハウジング３は、例えば、一方向に沿って長い形状を成している。固定部６は、ハウジング３の前側端に設けられている。ワークホルダ５及び取付部２は、固定部６から前側に延びている。 The power tool 1 includes a work holder 5 for holding the work and a fixing portion 6 for fixing the work holder 5. The housing 3 has, for example, a long shape along one direction. The fixing portion 6 is provided at the front end of the housing 3. The work holder 5 and the mounting portion 2 extend forward from the fixing portion 6.
　電動工具１は、トリガスイッチ７、ロックボタン８及び電源ケーブル９を備える。トリガスイッチ７及びロックボタン８は、ハウジング３から露出するようにハウジング３に設けられている。トリガスイッチ７は、電動工具１を運転させるためのスイッチである。トリガスイッチ７が押された状態では先端工具４が往復運動を行う。一方で、トリガスイッチ７が押されていない状態では、先端工具４は往復運動を行わない。ロックボタン８は、電動工具１を連続運転させるためのボタンである。トリガスイッチ７が強く押された状態でロックボタン８が押され、その後、ロックボタン８が押された状態でトリガスイッチ７が押されなくなると、電動工具１の動作モードは連続運転モードとなる。連続運転モードの電動工具１では、トリガスイッチ７が押されていない状態でも先端工具４が連続して往復運動する。電動工具１の動作モードが連続運転モードのときにトリガスイッチ７が押されると、連続運転モードが解除される。その後、トリガスイッチ７が押されなくなると、先端工具４の往復運動が停止する。電源ケーブル９は交流電源を伝達するケーブルである。電源ケーブル９は、例えば、商用電源を出力するコンセントに接続される。 The power tool 1 includes a trigger switch 7, a lock button 8, and a power cable 9. The trigger switch 7 and the lock button 8 are provided on the housing 3 so as to be exposed from the housing 3. The trigger switch 7 is a switch for operating the power tool 1. When the trigger switch 7 is pressed, the tip tool 4 reciprocates. On the other hand, when the trigger switch 7 is not pressed, the tip tool 4 does not reciprocate. The lock button 8 is a button for continuously operating the power tool 1. When the lock button 8 is pressed while the trigger switch 7 is strongly pressed, and then the trigger switch 7 is not pressed while the lock button 8 is pressed, the operation mode of the power tool 1 becomes the continuous operation mode. In the power tool 1 in the continuous operation mode, the tip tool 4 continuously reciprocates even when the trigger switch 7 is not pressed. When the trigger switch 7 is pressed while the operation mode of the power tool 1 is the continuous operation mode, the continuous operation mode is released. After that, when the trigger switch 7 is no longer pressed, the reciprocating motion of the tip tool 4 is stopped. The power cable 9 is a cable that transmits AC power. The power cable 9 is connected to, for example, an outlet that outputs commercial power.
　図３は、ハウジング３の内部の様子の一例を示す概略側面図である。ハウジング３は、例えば２分割可能となっている。図３では、ハウジング３を構成する２つの分割部品のうちの一方の分割部品が取り外されることによって、ハウジング３の内部が見えるようになっている。図４は、図３に示される構造の矢視Ａ－Ａにおける断面構造の概略を示す図である。図５は、図３に示される構造の矢視Ｂ－Ｂにおける断面構造の概略を示す図である。 FIG. 3 is a schematic side view showing an example of the inside of the housing 3. The housing 3 can be divided into two, for example. In FIG. 3, the inside of the housing 3 can be seen by removing one of the two divided parts constituting the housing 3. FIG. 4 is a diagram showing an outline of a cross-sectional structure of the structure shown in FIG. 3 in arrow view AA. FIG. 5 is a diagram showing an outline of a cross-sectional structure of the structure shown in FIG. 3 in arrow view BB.
　図３～５に示されるように、電動工具１は、複数のリニアモータ１０と、当該複数のリニアモータ１０によって駆動される駆動軸１１と、補助機構１２と、動吸振器１３とを備える。複数のリニアモータ１０、駆動軸１１、補助機構１２及び動吸振器１３は、ハウジング３に収容されている。 As shown in FIGS. 3 to 5, the electric tool 1 includes a plurality of linear motors 10, a drive shaft 11 driven by the plurality of linear motors 10, an auxiliary mechanism 12, and a dynamic vibration absorber 13. The plurality of linear motors 10, the drive shaft 11, the auxiliary mechanism 12, and the dynamic vibration absorber 13 are housed in the housing 3.
　駆動軸１１は、前後方向に沿って延在する。駆動軸１１の前側端は取付部２に固定されている。複数のリニアモータ１０は、駆動軸１１を往復運動させることができる。駆動軸１１が往復運動することによって、取付部２が往復運動する。その結果、先端工具４が往復運動する。各リニアモータ１０は、駆動軸１１を介して取付部２を往復運動させると言える。また、各リニアモータ１０は、駆動軸１１及び取付部２を介して先端工具４を往復運動させると言える。補助機構１２は、バネによる共振を利用して、リニアモータ１０による先端工具４の往復運動を補助する。動吸振器１３は、ハウジング３の振動を抑制する。以後、リニアモータ１０によって駆動される駆動軸１１、取付部２及び先端工具４をまとめて駆動対象物と呼ぶことがある。リニアモータ１０は駆動対象物を往復運動させる。 The drive shaft 11 extends along the front-rear direction. The front end of the drive shaft 11 is fixed to the mounting portion 2. The plurality of linear motors 10 can reciprocate the drive shaft 11. The reciprocating motion of the drive shaft 11 causes the mounting portion 2 to reciprocate. As a result, the tip tool 4 reciprocates. It can be said that each linear motor 10 reciprocates the mounting portion 2 via the drive shaft 11. Further, it can be said that each linear motor 10 reciprocates the tip tool 4 via the drive shaft 11 and the mounting portion 2. The auxiliary mechanism 12 assists the reciprocating motion of the tip tool 4 by the linear motor 10 by utilizing the resonance caused by the spring. The Tuned Mass Damper 13 suppresses the vibration of the housing 3. Hereinafter, the drive shaft 11, the mounting portion 2, and the tip tool 4 driven by the linear motor 10 may be collectively referred to as a drive object. The linear motor 10 reciprocates the object to be driven.
　電動工具１は、例えば２つのリニアモータ１０を備える。一方のリニアモータ１０は、例えば、ハウジング３の前側部分に収容されている。他方のリニアモータ１０は、例えば、ハウジング３の後ろ側部分に収容されている。以後、前側のリニアモータ１０をリニアモータ１０Ａと呼ぶことがある。また、後ろ側のリニアモータ１０をリニアモータ１０Ｂと呼ぶことがある。 The power tool 1 includes, for example, two linear motors 10. One linear motor 10 is housed in, for example, the front side portion of the housing 3. The other linear motor 10 is housed in, for example, a rear portion of the housing 3. Hereinafter, the linear motor 10 on the front side may be referred to as a linear motor 10A. Further, the linear motor 10 on the rear side may be referred to as a linear motor 10B.
　ハウジング３は、ユーザによって把持される把持部３００を備える。把持部３００は、略筒状を成している。把持部３００は前後方向に延びている。補助機構１２及び動吸振器１３は、例えば把持部３００に収容されている。補助機構１２及び動吸振器１３は、前後方向に直交する方向において並んでいる。本例では、補助機構１２及び動吸振器１３は上下方向に並んでいるが、補助機構１２及び動吸振器１３の並び方はこの限りではない。例えば、補助機構１２及び動吸振器１３は、前後方向及び上下方向に直交する左右方向に並んでもよい。 The housing 3 includes a grip portion 300 that is gripped by the user. The grip portion 300 has a substantially tubular shape. The grip portion 300 extends in the front-rear direction. The auxiliary mechanism 12 and the dynamic vibration absorber 13 are housed in, for example, the grip portion 300. The auxiliary mechanism 12 and the dynamic vibration absorber 13 are arranged in a direction orthogonal to the front-rear direction. In this example, the auxiliary mechanism 12 and the dynamic vibration absorber 13 are arranged in the vertical direction, but the arrangement of the auxiliary mechanism 12 and the dynamic vibration absorber 13 is not limited to this. For example, the auxiliary mechanism 12 and the dynamic vibration absorber 13 may be arranged in the left-right direction orthogonal to the front-rear direction and the up-down direction.
　ハウジング３は、リニアモータ１０Ａを収容する収容部３１０と、リニアモータ１０Ｂを収容する収容部３２０とを備える。収容部３１０は把持部３００の前側に位置する。これにより、リニアモータ１０Ａは把持部３００の前側に位置する。リニアモータ１０Ａは補助機構１２及び動吸振器１３の前側に位置する。収容部３２０は把持部３００の後ろ側に位置する。これにより、リニアモータ１０Ｂは把持部３００の後が側に位置する。リニアモータ１０Ｂは補助機構１２及び動吸振器１３の後ろ側に位置する。 The housing 3 includes an accommodating portion 310 for accommodating the linear motor 10A and an accommodating portion 320 accommodating the linear motor 10B. The accommodating portion 310 is located on the front side of the grip portion 300. As a result, the linear motor 10A is located on the front side of the grip portion 300. The linear motor 10A is located on the front side of the auxiliary mechanism 12 and the dynamic vibration absorber 13. The accommodating portion 320 is located behind the grip portion 300. As a result, the linear motor 10B is located on the rear side of the grip portion 300. The linear motor 10B is located behind the auxiliary mechanism 12 and the dynamic vibration absorber 13.
　＜リニアモータの構成例＞
　次にリニアモータ１０の構成例について説明する。以下に説明する構成は一例であって、リニアモータ１０の構成は下記の例に限られない。 <Example of linear motor configuration>
Next, a configuration example of the linear motor 10 will be described. The configuration described below is an example, and the configuration of the linear motor 10 is not limited to the following example.
　各リニアモータ１０は、固定子１００及び可動子１１０を備える。固定子１００はハウジング３内に固定される。可動子１１０は、前後方向に沿って往復運動を行うことが可能である。可動子１１０は駆動軸１１に固定される。駆動軸１１は、可動子１１０の往復運動に連動して往復運動を行う。 Each linear motor 10 includes a stator 100 and a mover 110. The stator 100 is fixed in the housing 3. The mover 110 can reciprocate along the front-rear direction. The mover 110 is fixed to the drive shaft 11. The drive shaft 11 reciprocates in conjunction with the reciprocating motion of the mover 110.
　固定子１００は、コア１０１と、当該コア１０１に巻かれる複数のコイル１０２とを備える。各図では、コイル１０２が模式的に示されている。コア１０１は、枠状部１０１ａと、当該枠状部１０１ａの内側から互いに対向するように突出する２つのティース１０１ｂ（図５参照）とを備える。２つのティース１０１ｂは上下方向で対向している。各ティース１０１ｂには、２つのコイル１０２が巻かれている。本例では、固定子１００は４つのコイル１０２を備える。コイル１０２は、絶縁部材１０３を介してティース１０１ｂに巻かれている。一つのティース１０１ｂに巻かれた２つのコイル１０２の間には絶縁部材１０３が存在する。 The stator 100 includes a core 101 and a plurality of coils 102 wound around the core 101. In each figure, the coil 102 is schematically shown. The core 101 includes a frame-shaped portion 101a and two teeth 101b (see FIG. 5) protruding from the inside of the frame-shaped portion 101a so as to face each other. The two teeth 101b face each other in the vertical direction. Two coils 102 are wound around each tooth 101b. In this example, the stator 100 includes four coils 102. The coil 102 is wound around the teeth 101b via the insulating member 103. An insulating member 103 exists between the two coils 102 wound around one tooth 101b.
　一つのティース１０１ｂに巻かれた２つのコイル１０２は並列接続されている。さらに、固定子１００が備える４つのコイル１０２は並列接続されている。上側のティース１０１ｂに巻かれた２つのコイル１０２の巻線方向は、下側のティース１０１ｂに巻かれた２つのコイル１０２の巻線方向の逆方向となっている。本例では、上側のティース１０１ｂに発生する磁極は、下側のティース１０１ｂに発生する磁極の逆の磁極となる。 Two coils 102 wound around one tooth 101b are connected in parallel. Further, the four coils 102 included in the stator 100 are connected in parallel. The winding direction of the two coils 102 wound around the upper teeth 101b is opposite to the winding direction of the two coils 102 wound around the lower teeth 101b. In this example, the magnetic pole generated on the upper teeth 101b is the opposite magnetic pole of the magnetic pole generated on the lower teeth 101b.
　可動子１１０は、互いに対向する２つのティース１０１ｂの間に位置する。可動子１１０は、２つの磁石１１１と、当該２つの磁石１１１の間に位置するスペーサ１１２とを備える。２つの磁石１１１及びスペーサ１１２は、前後方向に沿って並んでおり、駆動軸１１に固定されている。前側の磁石１１１の上側端部の磁極は、前側の磁石１１１の下側端部の磁極の逆の磁極となっている。後ろ側の磁石１１１の上側端部の磁極は、後ろ側の磁石１１１の下側端部の磁極の逆の磁極となっている。前側の磁石１１１の上側端部の磁極は、後ろ側の磁石１１１の上側端部の磁極と逆の磁極となっている。前側の磁石１１１の下側端部の磁極は、後ろ側の磁石１１１の下側端部の磁極と逆の磁極となっている。ティース１０１ｂに巻かれた２つのコイル１０２のうちの可動子１１０側のコイル１０２と、可動子１１０の各磁石１１１との間には絶縁部材１０３が存在する。なお、可動子１１０はスペーサ１１２を備えなくてもよい。この場合、２つの磁石１１１は互いに隣接するように位置してもよい。 The mover 110 is located between two teeth 101b facing each other. The mover 110 includes two magnets 111 and a spacer 112 located between the two magnets 111. The two magnets 111 and the spacer 112 are aligned in the front-rear direction and are fixed to the drive shaft 11. The magnetic pole at the upper end of the front magnet 111 is the opposite of the magnetic pole at the lower end of the front magnet 111. The magnetic pole at the upper end of the magnet 111 on the rear side is the opposite of the magnetic pole at the lower end of the magnet 111 on the rear side. The magnetic pole at the upper end of the front magnet 111 is the opposite of the magnetic pole at the upper end of the rear magnet 111. The magnetic pole at the lower end of the front magnet 111 is the opposite of the magnetic pole at the lower end of the rear magnet 111. An insulating member 103 exists between the coil 102 on the mover 110 side of the two coils 102 wound around the teeth 101b and each magnet 111 of the mover 110. The mover 110 does not have to include the spacer 112. In this case, the two magnets 111 may be located adjacent to each other.
　図６及び７は、リニアモータ１０の動作の一例を説明するための図である。図６及び７に示されるリニアモータ１０では、説明の便宜上、コア１０１の枠状部１０１ａと絶縁部材１０３の記載が省略されている。 6 and 7 are diagrams for explaining an example of the operation of the linear motor 10. In the linear motor 10 shown in FIGS. 6 and 7, the description of the frame-shaped portion 101a of the core 101 and the insulating member 103 is omitted for convenience of explanation.
　図６及び７の例では、前側の磁石１１１の上側端部及び下側端部の磁極は、それぞれＳ極及びＮ極となっている。また、後ろ側の磁石１１１の上側端部及び下側端部の磁極は、それぞれＮ極及びＳ極となっている。 In the examples of FIGS. 6 and 7, the magnetic poles at the upper end and the lower end of the front magnet 111 are S pole and N pole, respectively. Further, the magnetic poles of the upper end portion and the lower end portion of the magnet 111 on the rear side are N pole and S pole, respectively.
　図６に示されるように、上側及び下側のティース１０１ｂの磁極がそれぞれＮ極及びＳ極に設定された場合を考える。この場合、前側の磁石１１１の上側端部と上側のティース１０１ｂとが引き合う一方、後側の磁石１１１の上側端部と上側のティース１０１ｂとが反発する。また、前側の磁石１１１の下側端部と下側のティース１０１ｂとが引き合う一方、後側の磁石１１１の下側端部と下側のティース１０１ｂとが反発する。これにより、可動子１１０が後ろ側へ移動し、それに応じて駆動軸１１が後ろ側へ移動する。 As shown in FIG. 6, consider a case where the magnetic poles of the upper and lower teeth 101b are set to the north pole and the south pole, respectively. In this case, the upper end of the front magnet 111 and the upper teeth 101b attract each other, while the upper end of the rear magnet 111 and the upper teeth 101b repel each other. Further, the lower end portion of the magnet 111 on the front side and the tooth 101b on the lower side attract each other, while the lower end portion of the magnet 111 on the rear side and the tooth 101b on the lower side repel each other. As a result, the mover 110 moves to the rear side, and the drive shaft 11 moves to the rear side accordingly.
　次に、図７に示されるように、上側及び下側のティース１０１ｂの磁極がそれぞれＳ極及びＮ極に設定された場合を考える。この場合、前側の磁石１１１の上側端部と上側のティース１０１ｂとが反発する一方、後側の磁石１１１の上側端部と上側のティース１０１ｂとが引き合う。また、前側の磁石１１１の下側端部と下側のティース１０１ｂとが反発する一方、後側の磁石１１１の下側端部と下側のティース１０１ｂとが引き合う。これにより、可動子１１０が前側へ移動し、それに応じて駆動軸１１が前側へ移動する。 Next, consider the case where the magnetic poles of the upper and lower teeth 101b are set to the S pole and the N pole, respectively, as shown in FIG. In this case, the upper end of the front magnet 111 and the upper teeth 101b repel each other, while the upper end of the rear magnet 111 and the upper teeth 101b attract each other. Further, the lower end of the front magnet 111 and the lower teeth 101b repel each other, while the lower end of the rear magnet 111 and the lower teeth 101b attract each other. As a result, the mover 110 moves to the front side, and the drive shaft 11 moves to the front side accordingly.
　本例では、電動工具１が運転中の場合、電源ケーブル９が伝達する交流電源が各リニアモータ１０に直接供給される。これにより、固定子１００の各コイル１０２に交流電流が流れて、各ティース１０１ｂの磁極は、図６の状態と図７の状態を交互にとるようになる。これにより、可動子１１０が前後方向に往復運動する。 In this example, when the power tool 1 is in operation, the AC power transmitted by the power cable 9 is directly supplied to each linear motor 10. As a result, an alternating current flows through each coil 102 of the stator 100, and the magnetic poles of the teeth 101b alternately take the state of FIG. 6 and the state of FIG. 7. As a result, the mover 110 reciprocates in the front-rear direction.
　このようにして、各リニアモータ１０の可動子１１０が前後方向に往復運動することによって、駆動軸１１、取付部２及び先端工具４が前後方向に往復運動する。つまり、各リニアモータ１０の可動子１１０が前後方向に往復運動することによって、駆動対象物が前後方向に往復運動する。以後、可動子１１０及び駆動対象物をまとめて往復運動体と呼ぶことがある。 In this way, the mover 110 of each linear motor 10 reciprocates in the front-rear direction, so that the drive shaft 11, the mounting portion 2, and the tip tool 4 reciprocate in the front-rear direction. That is, the mover 110 of each linear motor 10 reciprocates in the front-rear direction, so that the object to be driven reciprocates in the front-rear direction. Hereinafter, the mover 110 and the driving object may be collectively referred to as a reciprocating motion body.
　本例のように、リニアモータ１０によって先端工具４を往復運動させる場合には、回転式モータを使用する場合と比較して、回転運動を往復運動に変換する、カム等の変換機構が不要となる。また、本例では、ギア等の減速機構も不要となる。変換機構及び減速機構からは騒音が生じる可能性がある。本例では、変換機構及び減速機構が不要となることから、電動工具１の騒音を低減することができる。 When the tip tool 4 is reciprocated by the linear motor 10 as in this example, a conversion mechanism such as a cam that converts the rotary motion into a reciprocating motion is unnecessary as compared with the case where the rotary motor is used. Become. Further, in this example, a reduction mechanism such as a gear is not required. Noise may be generated from the conversion mechanism and the deceleration mechanism. In this example, since the conversion mechanism and the deceleration mechanism are unnecessary, the noise of the power tool 1 can be reduced.
　＜補助機構の構成例＞
　次に補助機構１２の構成例について説明する。以下に説明する構成は一例であって、補助機構１２の構成は下記の例に限られない。 <Configuration example of auxiliary mechanism>
Next, a configuration example of the auxiliary mechanism 12 will be described. The configuration described below is an example, and the configuration of the auxiliary mechanism 12 is not limited to the following example.
　補助機構１２は、２つのバネ１２１と、当該２つのバネ１２１の一端を保持する保持部１２０とを備える。保持部１２０は駆動軸１１に固定されている。各バネ１２１は、例えば圧縮コイルバネである。保持部１２０と２つのバネ１２１は前後方向に沿って並んでいる。一方のバネ１２１は保持部１２０の前側に位置し、他方のバネ１２１は保持部１２０の後ろ側に位置する。各バネ１２１は、前後方向に伸張可能である。駆動軸１１は各バネ１２１の内側を通っている。 The auxiliary mechanism 12 includes two springs 121 and a holding portion 120 that holds one end of the two springs 121. The holding portion 120 is fixed to the drive shaft 11. Each spring 121 is, for example, a compression coil spring. The holding portion 120 and the two springs 121 are arranged along the front-rear direction. One spring 121 is located on the front side of the holding portion 120, and the other spring 121 is located on the rear side of the holding portion 120. Each spring 121 can be extended in the front-rear direction. The drive shaft 11 passes through the inside of each spring 121.
　各バネ１２１の一端は、保持部１２０の移動に応じて移動する。各バネ１２１の他端は、ハウジング３に間接的あるいは直接的に固定されている。本例では、補助機構１２は、各バネ１２１について、バネ１２１の他端を保持する保持部材１２２を備える。また、補助機構１２は、各保持部材１２２について、保持部材１２２を把持部３００に固定する固定部１２３を備える。これにより、各バネ１２１の他端は、ハウジング３に間接的に固定される。固定部１２３は、ハウジング３と一体的に形成されてもよいし、ハウジング３と別体であってもよい。保持部材１２２及び固定部１２３のそれぞれは、前後方向に貫通する貫通孔を有している。駆動軸１１は保持部材１２２及び固定部１２３の貫通孔を通っている。各バネ１２１の端部は、自由端であってもよいし、固定端であってもよい。すなわち、各バネ１２１の２つの端部は、どちらも自由端であってもよいし、どちらも固定端であってもよい。また、各バネ１２１の２つの端部の一方が自由端であり、当該２つの端部の他方が固定端であってもよい。 One end of each spring 121 moves according to the movement of the holding portion 120. The other end of each spring 121 is indirectly or directly fixed to the housing 3. In this example, the auxiliary mechanism 12 includes, for each spring 121, a holding member 122 that holds the other end of the spring 121. Further, the auxiliary mechanism 12 includes a fixing portion 123 for fixing the holding member 122 to the grip portion 300 for each holding member 122. As a result, the other end of each spring 121 is indirectly fixed to the housing 3. The fixing portion 123 may be formed integrally with the housing 3 or may be a separate body from the housing 3. Each of the holding member 122 and the fixing portion 123 has a through hole penetrating in the front-rear direction. The drive shaft 11 passes through the through holes of the holding member 122 and the fixing portion 123. The end of each spring 121 may be a free end or a fixed end. That is, the two ends of each spring 121 may both be free ends or both may be fixed ends. Further, one of the two ends of each spring 121 may be a free end, and the other of the two ends may be a fixed end.
　保持部１２０は、駆動軸１１に固定されていることから、駆動軸１１とともに移動する。本例では、２つのバネ１２１は、自然長よりも少し短い状態で把持部３００に収容されている。つまり、各バネ１２１の初期状態は少し圧縮された状態となっている。 Since the holding portion 120 is fixed to the drive shaft 11, it moves together with the drive shaft 11. In this example, the two springs 121 are housed in the grip 300 in a state slightly shorter than the natural length. That is, the initial state of each spring 121 is a slightly compressed state.
　補助機構１２では、保持部１２０及び駆動軸１１が後ろ側に移動すると、前側のバネ１２１が初期状態から伸張するとともに、後ろ側のバネ１２１が初期状態から圧縮する。これにより、保持部１２０及び駆動軸１１には前方向の力が加わる。一方で、保持部１２０及び駆動軸１１が前側に移動すると、前側のバネ１２１が初期状態から圧縮するとともに、後ろ側のバネ１２１が初期状態から伸張する。これにより、保持部１２０及び駆動軸１１には後ろ方向の力が加わる。 In the auxiliary mechanism 12, when the holding portion 120 and the drive shaft 11 move to the rear side, the spring 121 on the front side expands from the initial state, and the spring 121 on the rear side compresses from the initial state. As a result, a force in the forward direction is applied to the holding portion 120 and the drive shaft 11. On the other hand, when the holding portion 120 and the drive shaft 11 move to the front side, the spring 121 on the front side compresses from the initial state, and the spring 121 on the rear side expands from the initial state. As a result, a force in the rear direction is applied to the holding portion 120 and the drive shaft 11.
　このように、補助機構１２では、バネ１２１の働きによって、保持部１２０及び駆動軸１１が移動する方向とは逆方向の力が保持部１２０及び駆動軸１１に加わる。これにより、保持部１２０及び駆動軸１１は、バネ１２１の働きによって、前後方向に振動することが可能である。前後方向の振動は、前後方向の往復運動であるとも言える。 As described above, in the auxiliary mechanism 12, a force in the direction opposite to the direction in which the holding portion 120 and the drive shaft 11 move is applied to the holding portion 120 and the drive shaft 11 by the action of the spring 121. As a result, the holding portion 120 and the drive shaft 11 can vibrate in the front-rear direction by the action of the spring 121. It can be said that the vibration in the front-back direction is a reciprocating motion in the front-back direction.
　一方で、上述のように、リニアモータ１０は駆動軸１１を前後方向に往復運動させることから、保持部１２０及び駆動軸１１は、リニアモータ１０からの力によっても、前後方向に振動することが可能である。 On the other hand, as described above, since the linear motor 10 reciprocates the drive shaft 11 in the front-rear direction, the holding portion 120 and the drive shaft 11 may vibrate in the front-rear direction even by the force from the linear motor 10. It is possible.
　本例では、バネ１２１によって振動する保持部１２０及び駆動軸１１に対して、リニアモータ１０からの力が加えられた場合に、保持部１２０及び駆動軸１１の振動が共振するように、バネ１２１のバネ定数等が適切に設定されている。これにより、補助機構１２は、バネ１２１による共振を利用して、リニアモータ１０による保持部１２０及び駆動軸１１の往復運動を補助することができる。言い換えれば、補助機構１２は、バネ１２１による共振を利用して、リニアモータ１０による取付部２及び先端工具４の往復運動を補助することができる。よって、リニアモータ１０の駆動に必要な電力を減少することができる。その結果、電動工具１の消費電力を低減することができる。また、リニアモータ１０の発熱を低減することができる。本例では、リニアモータ１０と、リニアモータ１０によって駆動される、駆動軸１１等を含む駆動対象物と、補助機構１２とは、リニア共振アクチュエータを構成していると言える。なお、補助機構１２は、２つのバネ１２１の一方を備えなくてもよい。また、ハウジング３内での補助機構１２の配置場所は上記の例に限られない。 In this example, the spring 121 so that the vibrations of the holding portion 120 and the driving shaft 11 resonate when a force from the linear motor 10 is applied to the holding portion 120 and the driving shaft 11 vibrating by the spring 121. The spring constant etc. of is set appropriately. As a result, the auxiliary mechanism 12 can assist the reciprocating motion of the holding portion 120 and the drive shaft 11 by the linear motor 10 by utilizing the resonance caused by the spring 121. In other words, the auxiliary mechanism 12 can assist the reciprocating motion of the mounting portion 2 and the tip tool 4 by the linear motor 10 by utilizing the resonance caused by the spring 121. Therefore, the electric power required to drive the linear motor 10 can be reduced. As a result, the power consumption of the power tool 1 can be reduced. Moreover, the heat generation of the linear motor 10 can be reduced. In this example, it can be said that the linear motor 10, the drive object including the drive shaft 11 and the like driven by the linear motor 10, and the auxiliary mechanism 12 constitute a linear resonance actuator. The auxiliary mechanism 12 does not have to include one of the two springs 121. Further, the arrangement location of the auxiliary mechanism 12 in the housing 3 is not limited to the above example.
　＜動吸振器の構成例＞
　次に動吸振器１３の構成例について説明する。以下に説明する構成は一例であって、動吸振器１３の構成は下記の例に限られない。 <Example of Tuned Mass Damper Configuration>
Next, a configuration example of the dynamic vibration absorber 13 will be described. The configuration described below is an example, and the configuration of the tuned mass damper 13 is not limited to the following example.
　動吸振器１３は、例えば、質量体１３０と、当該質量体１３０を移動させる２つのバネ１３１とを備える。質量体１３０と２つのバネ１３１は前後方向に沿って並んでいる。一方のバネ１３１は質量体１３０の前側に位置し、他方のバネ１３１は質量体１３０の後ろ側に位置する。各バネ１３１は前後方向に沿って伸縮可能である。 The dynamic vibration absorber 13 includes, for example, a mass body 130 and two springs 131 for moving the mass body 130. The mass body 130 and the two springs 131 are aligned in the front-rear direction. One spring 131 is located on the front side of the mass body 130, and the other spring 131 is located on the rear side of the mass body 130. Each spring 131 can expand and contract along the front-rear direction.
　２つのバネ１３１の一端は、質量体１３０の前後方向の両端にそれぞれ接続されている。２つのバネ１３１の他端のそれぞれは、ハウジング３に対して間接的あるいは直接的に固定されている。本例では、動吸振器１３は、各バネ１３１について、バネ１３１の他端を保持する保持部材１３２を備える。また、動吸振器１３は、各保持部材１３２ついて、保持部材１３２を把持部３００に固定する固定部１３３を備える。これにより、各バネ１３１の他端は、ハウジング３に間接的に固定される。各バネ１３１の端部は、自由端であってもよいし、固定端であってもよい。すなわち、各バネ１３１の２つの端部は、どちらも自由端であってもよいし、どちらも固定端であってもよい。また、各バネ１３１の２つの端部の一方が自由端であり、当該２つの端部の他方が固定端であってもよい。 One ends of the two springs 131 are connected to both ends of the mass body 130 in the front-rear direction. Each of the other ends of the two springs 131 is indirectly or directly fixed to the housing 3. In this example, the Tuned Mass Damper 13 includes, for each spring 131, a holding member 132 that holds the other end of the spring 131. Further, the dynamic vibration absorber 13 includes a fixing portion 133 for fixing the holding member 132 to the grip portion 300 for each holding member 132. As a result, the other end of each spring 131 is indirectly fixed to the housing 3. The end of each spring 131 may be a free end or a fixed end. That is, the two ends of each spring 131 may both be free ends or both may be fixed ends. Further, one of the two ends of each spring 131 may be a free end, and the other of the two ends may be a fixed end.
　動吸振器１３は、質量体１３０が、往復運動体の振動（言い換えれば、往復運動）とは逆位相で振動するように構成されている。これにより、動吸振器１３は、往復運動体の振動によってハウジング３に生じる振動を吸収することができる。よって、ユーザによって把持されるハウジング３の振動を小さくすることができる。その結果、電動工具１の操作性が向上する。なお、ハウジング３内での動吸振器１３の配置場所は上記の例に限られない。 The Tuned Mass Damper 13 is configured such that the mass body 130 vibrates in a phase opposite to the vibration of the reciprocating motion (in other words, the reciprocating motion). As a result, the dynamic vibration absorber 13 can absorb the vibration generated in the housing 3 due to the vibration of the reciprocating motion body. Therefore, the vibration of the housing 3 gripped by the user can be reduced. As a result, the operability of the power tool 1 is improved. The location of the Tuned Mass Damper 13 in the housing 3 is not limited to the above example.
　＜冷却機構の構成例＞
　電動工具１は、リニアモータ１０を冷却する冷却機構を有している。冷却機構は、複数の逆止弁１４０～１４３と、空気圧増減部１５０とを備える。逆止弁１４０及び１４１は、リニアモータ１０Ａが収容される収容部３１０に設けられている。逆止弁１４２及び１４３は、リニアモータ１０Ｂが収容される収容部３２０に設けられている。空気圧増減部１５０は、収容部３１０及び３２０内での空気圧を増減することができる。 <Configuration example of cooling mechanism>
The power tool 1 has a cooling mechanism for cooling the linear motor 10. The cooling mechanism includes a plurality of check valves 140 to 143 and an air pressure increasing / decreasing unit 150. The check valves 140 and 141 are provided in the accommodating portion 310 in which the linear motor 10A is accommodated. The check valves 142 and 143 are provided in the accommodating portion 320 in which the linear motor 10B is accommodated. The air pressure increase / decrease unit 150 can increase / decrease the air pressure in the accommodating units 310 and 320.
　逆止弁１４０は、ハウジング３の外側の空気を収容部３１０内に取り込むことが可能である。一方で、逆止弁１４０は、収容部３１０内に空気を、ハウジング３の外側に排気することはできない。 The check valve 140 can take in the air outside the housing 3 into the accommodating portion 310. On the other hand, the check valve 140 cannot exhaust air into the accommodating portion 310 to the outside of the housing 3.
　逆止弁１４１は、収容部３１０内の空気を、ハウジング３の外側に排気することが可能である。一方で、逆止弁１４１は、ハウジング３の外側の空気を収容部３１０内に取り込むことはできない。 The check valve 141 can exhaust the air inside the accommodating portion 310 to the outside of the housing 3. On the other hand, the check valve 141 cannot take in the air outside the housing 3 into the accommodating portion 310.
　逆止弁１４０は、例えば、リニアモータ１０Ａの上側に位置する。逆止弁１４１は、例えば、リニアモータ１０Ａの下側に位置する。逆止弁１４０、リニアモータ１０Ａ及び逆止弁１４１は上下方向に沿って並んでいる。 The check valve 140 is located above the linear motor 10A, for example. The check valve 141 is located, for example, below the linear motor 10A. The check valve 140, the linear motor 10A, and the check valve 141 are arranged in the vertical direction.
　逆止弁１４２は、ハウジング３の外側の空気を収容部３２０内に取り込むことが可能である。一方で、逆止弁１４２は、収容部３２０内に空気を、ハウジング３の外側に排気することはできない。 The check valve 142 can take in the air outside the housing 3 into the accommodating portion 320. On the other hand, the check valve 142 cannot exhaust air into the accommodating portion 320 to the outside of the housing 3.
　逆止弁１４３は、収容部３２０内の空気を、ハウジング３の外側に排気することが可能である。一方で、逆止弁１４３は、ハウジング３の外側の空気を収容部３２０内に取り込むことはできない。 The check valve 143 can exhaust the air inside the accommodating portion 320 to the outside of the housing 3. On the other hand, the check valve 143 cannot take in the air outside the housing 3 into the accommodating portion 320.
　逆止弁１４２は、例えば、リニアモータ１０Ｂの上側に位置する。逆止弁１４３は、例えば、リニアモータ１０Ｂの下側に位置する。逆止弁１４２、リニアモータ１０Ｂ及び逆止弁１４３は上下方向に沿って並んでいる。 The check valve 142 is located above the linear motor 10B, for example. The check valve 143 is located, for example, below the linear motor 10B. The check valve 142, the linear motor 10B, and the check valve 143 are arranged in the vertical direction.
　空気圧増減部１５０は、例えば、把持部３００の後端部に収容されている。空気圧増減部１５０は、例えば筒状部１５１を備える。筒状部１５１は前後方向に開口している。駆動軸１１は筒状部１５１の内側を通っている。 The air pressure increase / decrease portion 150 is housed in, for example, the rear end portion of the grip portion 300. The air pressure increasing / decreasing unit 150 includes, for example, a tubular portion 151. The tubular portion 151 is open in the front-rear direction. The drive shaft 11 passes through the inside of the tubular portion 151.
　また、空気圧増減部１５０は、第１仕切り部１５２及び第２仕切り部１５３を備える。第１仕切り部１５２及び第２仕切り部１５３は、ハウジング３において、空気圧増減部１５０よりも前側の前側空間と、空気圧増減部１５０よりも後ろ側の後ろ側空間とを区分する。これにより、収容部３１０と収容部３２０が、第１仕切り部１５２及び第２仕切り部１５３によって区分される。 Further, the air pressure increasing / decreasing section 150 includes a first partition section 152 and a second partition section 153. The first partition portion 152 and the second partition portion 153 divide the front space on the front side of the air pressure increase / decrease unit 150 and the rear space on the rear side of the air pressure increase / decrease unit 150 in the housing 3. As a result, the accommodating portion 310 and the accommodating portion 320 are separated by the first partition portion 152 and the second partition portion 153.
　第１仕切り部１５２は、例えばフランジ状を成している。第１仕切り部１５２は、筒状部１５１の外周面を取り囲むように、当該外周面に突設されている。第１仕切り部１５２は、把持部３００の内周面をその周方向に沿うように当該内周面に固定されている。 The first partition portion 152 has, for example, a flange shape. The first partition portion 152 is projected from the outer peripheral surface so as to surround the outer peripheral surface of the tubular portion 151. The first partition portion 152 is fixed to the inner peripheral surface of the grip portion 300 so as to follow the circumferential direction thereof.
　第２仕切り部１５３は、筒状部１５１の内側に位置し、筒状部１５１の内側の空間を前後方向に２つに区分する。第２仕切り部１５３は、例えば、板状部１５３ａ及びＯリング１５３ｂを備える。板状部１５３ａは、筒状部１５１の内側において駆動軸１１に固定されている。板状部１５３ａの側面には溝が１周形成されている。この溝にＯリング１５３ｂが嵌められることによって、第２仕切り部１５３は、筒状部１５１の内周面と密着する。 The second partition portion 153 is located inside the tubular portion 151, and divides the space inside the tubular portion 151 into two in the front-rear direction. The second partition portion 153 includes, for example, a plate-shaped portion 153a and an O-ring 153b. The plate-shaped portion 153a is fixed to the drive shaft 11 inside the tubular portion 151. A groove is formed once on the side surface of the plate-shaped portion 153a. By fitting the O-ring 153b into this groove, the second partition portion 153 comes into close contact with the inner peripheral surface of the tubular portion 151.
　ハウジング３の前側空間及び後ろ側空間が、第１仕切り部１５２及び第２仕切り部１５３によって区分されることによって、前側空間と後ろ側空間の間での空気の流れが防止される。本例では、駆動軸１１に固定された第２仕切り部１５３が、駆動軸１１の前後方向の往復運動に連動して、前後方向に往復運動を行う。これにより、前側空間内の空気圧と、後ろ側空間内の空気圧とが変化する。空気圧増減部１５０は、前側空間内の空気圧と後ろ側空間内の空気圧を、駆動対象物の往復運動に連動して増減するとも言える。 By separating the front space and the rear space of the housing 3 by the first partition portion 152 and the second partition portion 153, the flow of air between the front space and the rear space is prevented. In this example, the second partition portion 153 fixed to the drive shaft 11 reciprocates in the front-rear direction in conjunction with the reciprocating motion of the drive shaft 11 in the front-rear direction. As a result, the air pressure in the front space and the air pressure in the rear space change. It can be said that the air pressure increase / decrease unit 150 increases / decreases the air pressure in the front space and the air pressure in the rear space in conjunction with the reciprocating motion of the driving object.
　第２仕切り部１５３が前側に移動すると、前側空間内の空気圧が増加するとともに、後ろ側空間内の空気圧が減少する。よって、第２仕切り部１５３が前側に移動すると、収容部３１０内の空気圧が増加するとともに収容部３２０内の空気圧が減少する。第２仕切り部１５３が後ろ側に移動すると、前側空間内の空気圧が減少するとともに、後ろ側空間内の空気圧が増加する。よって、第２仕切り部１５３が後ろ側に移動すると、収容部３１０内の空気圧が減少するとともに収容部３２０内の空気圧が増加する。 When the second partition portion 153 moves to the front side, the air pressure in the front space increases and the air pressure in the rear space decreases. Therefore, when the second partition portion 153 moves to the front side, the air pressure in the accommodating portion 310 increases and the air pressure in the accommodating portion 320 decreases. When the second partition portion 153 moves to the rear side, the air pressure in the front space decreases and the air pressure in the rear space increases. Therefore, when the second partition portion 153 moves to the rear side, the air pressure in the accommodating portion 310 decreases and the air pressure in the accommodating portion 320 increases.
　本例では、収容部３１０内の空気圧が減少したとき逆止弁１４０が収容部３１０内に空気を取り込み、収容部３１０内の空気圧が増加したとき逆止弁１４１が収容部３１０内の空気を排気することによって、収容部３１０内のリニアモータ１０Ａが冷却される。本例では、収容部３１０内の空気圧は、第２仕切り部１５３の往復運動に連動して増減することから、逆止弁１４０による吸気と逆止弁１４１による排気とが交互に連続的に行われる。これにより、電動工具１では、収容部３１０の上側から収容部３１０内に取り込まれた空気が、冷却風として、リニアモータ１０Ａに当たり、その後、収容部３１０の下側から排出されるという処理が、繰り返し実行されて、リニアモータ１０Ａが冷却される。 In this example, the check valve 140 takes in air into the accommodating portion 310 when the air pressure in the accommodating portion 310 decreases, and the check valve 141 takes in the air in the accommodating portion 310 when the air pressure in the accommodating portion 310 increases. By exhausting, the linear motor 10A in the accommodating portion 310 is cooled. In this example, since the air pressure in the accommodating portion 310 increases or decreases in conjunction with the reciprocating motion of the second partition portion 153, the intake air by the check valve 140 and the exhaust air by the check valve 141 are alternately and continuously performed. Will be. As a result, in the power tool 1, the air taken into the accommodating portion 310 from the upper side of the accommodating portion 310 hits the linear motor 10A as cooling air, and then is discharged from the lower side of the accommodating portion 310. It is repeatedly executed to cool the linear motor 10A.
　同様に、収容部３２０内の空気圧が減少したとき逆止弁１４２が収容部３３０内に空気を取り込み、収容部３２０内の空気圧が増加したとき逆止弁１４３が収容部３２０内の空気を排気することによって、収容部３２０内のリニアモータ１０Ｂが冷却される。本例では、収容部３２０内の空気圧は、第２仕切り部１５３の往復運動に連動して増減することから、逆止弁１４２による吸気と逆止弁１４３による排気とが交互に連続的に行われる。これにより、電動工具１では、収容部３２０の上側から収容部３２０内に取り込まれた空気が、冷却風として、リニアモータ１０Ｂに当たり、その後、収容部３２０の下側から排出されるという処理が、繰り返し実行されて、リニアモータ１０Ｂが冷却される。 Similarly, when the air pressure in the accommodating portion 320 decreases, the check valve 142 takes in air into the accommodating portion 330, and when the air pressure in the accommodating portion 320 increases, the check valve 143 exhausts the air in the accommodating portion 320. By doing so, the linear motor 10B in the accommodating portion 320 is cooled. In this example, since the air pressure in the accommodating portion 320 increases or decreases in conjunction with the reciprocating motion of the second partition portion 153, the intake air by the check valve 142 and the exhaust air by the check valve 143 are alternately and continuously performed. Will be. As a result, in the power tool 1, the air taken into the accommodating portion 320 from the upper side of the accommodating portion 320 hits the linear motor 10B as cooling air, and then is discharged from the lower side of the accommodating portion 320. It is repeatedly executed to cool the linear motor 10B.
　なお、冷却機構の構成は上記の例に限られない。例えば、空気圧増減部１５０は、リニアモータ１０Ｂよりも後ろ側に設けられてもよい。この場合、第２仕切り部１５３が後ろ側に移動すると、空気圧増減部１５０の前側に位置する収容部３１０及び３２０内の空気圧が減少する。これにより、逆止弁１４０は収容部３１０内に空気を取り込み、逆止弁１４２は収容部３２０内に空気を取り込む。一方で、第２仕切り部１５３が前側に移動すると、収容部３１０及び３２０内の空気圧が増加する。これにより、逆止弁１４１は収容部３１０内の空気を排気し、逆止弁１４３は収容部３２０内の空気を排気する。また、空気圧増減部１５０は、リニアモータ１０Ａよりも前側に設けられてもよい。 The configuration of the cooling mechanism is not limited to the above example. For example, the air pressure increasing / decreasing unit 150 may be provided behind the linear motor 10B. In this case, when the second partition portion 153 moves to the rear side, the air pressure in the accommodating portions 310 and 320 located on the front side of the air pressure increasing / decreasing portion 150 decreases. As a result, the check valve 140 takes in air into the accommodating portion 310, and the check valve 142 takes in air into the accommodating portion 320. On the other hand, when the second partition portion 153 moves to the front side, the air pressure in the accommodating portions 310 and 320 increases. As a result, the check valve 141 exhausts the air in the accommodating portion 310, and the check valve 143 exhausts the air in the accommodating portion 320. Further, the air pressure increase / decrease unit 150 may be provided on the front side of the linear motor 10A.
　このように、本例に係る冷却機構では、駆動軸１１の往復運動に連動して第２仕切り部１５３が往復運動することにより、収容部３１０及び３２０内の空気圧が増減する。そして、収容部３１０及び３２０内の空気圧が増減することによって、収容部３１０及び３２０にはリニアモータ１０を冷却する冷却風が流れる。これにより、リニアモータ１０によって駆動軸１１を往復運動させることによって、当該リニアモータ１０を冷却することができる。よって、簡単な構成でリニアモータ１０を冷却することができる。 As described above, in the cooling mechanism according to this example, the air pressure in the accommodating portions 310 and 320 is increased or decreased by the reciprocating motion of the second partition portion 153 in conjunction with the reciprocating motion of the drive shaft 11. Then, as the air pressure in the accommodating portions 310 and 320 increases or decreases, cooling air for cooling the linear motor 10 flows through the accommodating portions 310 and 320. As a result, the linear motor 10 can be cooled by reciprocating the drive shaft 11 by the linear motor 10. Therefore, the linear motor 10 can be cooled with a simple configuration.
　また、図３及び４の構成例では、駆動軸１１が前側に移動したとき、収容部３１０内の空気圧が増加するとともに収容部３２０内での空気圧が減少する。一方で、駆動軸１１が後ろ側に移動したとき、収容部３１０内の空気圧が減少するとともに収容部３２０内の空気圧が増加する。これにより、駆動軸１１の往復運動に連動させて収容部３１０及び３２０内の空気圧を効率よく増減させることができる。よって、リニアモータ１０Ａ及び１０Ｂを効率良く冷却することができる。 Further, in the configuration examples of FIGS. 3 and 4, when the drive shaft 11 moves to the front side, the air pressure in the accommodating portion 310 increases and the air pressure in the accommodating portion 320 decreases. On the other hand, when the drive shaft 11 moves to the rear side, the air pressure in the accommodating portion 310 decreases and the air pressure in the accommodating portion 320 increases. As a result, the air pressure in the accommodating portions 310 and 320 can be efficiently increased or decreased in conjunction with the reciprocating motion of the drive shaft 11. Therefore, the linear motors 10A and 10B can be cooled efficiently.
　＜ハウジング内の電線の配置例＞
　本例の電動工具１は複数の電線２０を備える。複数の電線２０には電線２０ａ～２０ｅが含まれる。図８は電線２０ａ～２０ｅの配置例を示す図である。図８では、電動工具１が模式的に示されている。 <Example of arrangement of electric wires in the housing>
The power tool 1 of this example includes a plurality of electric wires 20. The plurality of electric wires 20 include electric wires 20a to 20e. FIG. 8 is a diagram showing an arrangement example of the electric wires 20a to 20e. In FIG. 8, the power tool 1 is schematically shown.
　本例では、上述のように、２つのリニアモータ１０のそれぞれが４つのコイル１０２を備えている。したがって、電動工具１は合計８つのコイル１０２を備える。８つのコイル１０２は、例えば並列接続される。 In this example, as described above, each of the two linear motors 10 includes four coils 102. Therefore, the power tool 1 includes a total of eight coils 102. The eight coils 102 are connected in parallel, for example.
　電源ケーブル９は電線２０ａ及び２０ｂを備える。電線２０ａは、交流電源の一方の相の交流電圧を伝達する。電線２０ｂは、交流電源の他方の相の交流電圧を伝達する。電線２０ａは、例えば、後方のリニアモータ１０Ｂの各コイル１０２の一端に接続される。電線２０ｂは、例えば、トリガスイッチ７が有するスイッチ回路７０の一端に接続される。電線２０ｂは、収容部３２０内及び把持部３００内を通って、スイッチ回路７０に接続される。スイッチ回路７０は、例えば把持部３００内に位置する。 The power cable 9 includes electric wires 20a and 20b. The electric wire 20a transmits an AC voltage of one phase of the AC power supply. The wire 20b transmits the AC voltage of the other phase of the AC power supply. The electric wire 20a is connected to, for example, one end of each coil 102 of the rear linear motor 10B. The electric wire 20b is connected to, for example, one end of the switch circuit 70 of the trigger switch 7. The electric wire 20b is connected to the switch circuit 70 through the accommodating portion 320 and the grip portion 300. The switch circuit 70 is located, for example, in the grip portion 300.
　電線２０ｃは、スイッチ回路７０の他端とリニアモータ１０Ａの各コイル１０２の一端を接続する。電線２０ｃは、スイッチ回路７０から収容部３１０内を通ってリニアモータ１０Ａの各コイルの一端に接続される。電線２０ｄは、リニアモータ１０Ａの各コイル１０２の一端と、リニアモータ１０Ｂの各コイル１０２の他端とを接続する。電線２０ｄは、リニアモータ１０Ａのコイル１０２の一端から、収容部３１０、把持部３００及び収容部３２０を順に通ってリニアモータ１０Ｂのコイル１０２の他端に接続される。電線２０ｅは、リニアモータ１０Ａの各コイル１０２の他端と、リニアモータ１０Ｂの各コイル１０２の一端とを接続する。電線２０ｅは、リニアモータ１０Ａのコイル１０２の他端から、収容部３１０、把持部３００及び収容部３２０を順に通ってリニアモータ１０Ｂのコイル１０２の一端に接続される。電線２０ｂ，２０ｅ，２０ｄは、例えば、把持部３００の内周面に設けられた溝にまとめて通されている。これにより、電線２０ｂ，２０ｅ，２０ｄは把持部３００に固定されている。電線２０ｂ，２０ｅ，２０ｄの把持部３００に対する固定方法はこれに限られない。 The electric wire 20c connects the other end of the switch circuit 70 to one end of each coil 102 of the linear motor 10A. The electric wire 20c is connected to one end of each coil of the linear motor 10A from the switch circuit 70 through the accommodating portion 310. The electric wire 20d connects one end of each coil 102 of the linear motor 10A and the other end of each coil 102 of the linear motor 10B. The electric wire 20d is connected to the other end of the coil 102 of the linear motor 10B from one end of the coil 102 of the linear motor 10A through the accommodating portion 310, the grip portion 300, and the accommodating portion 320 in this order. The electric wire 20e connects the other end of each coil 102 of the linear motor 10A and one end of each coil 102 of the linear motor 10B. The electric wire 20e is connected to one end of the coil 102 of the linear motor 10B from the other end of the coil 102 of the linear motor 10A through the accommodating portion 310, the grip portion 300, and the accommodating portion 320 in this order. The electric wires 20b, 20e, and 20d are collectively passed through, for example, a groove provided on the inner peripheral surface of the grip portion 300. As a result, the electric wires 20b, 20e, and 20d are fixed to the grip portion 300. The method of fixing the electric wires 20b, 20e, and 20d to the grip portion 300 is not limited to this.
　なお、電動工具１が備える電線２０の数は上記の例に限られない。また、電動工具１において、電線２０よる構成間の接続方法は上記の例に限られない。例えば、電源ケーブル９の電線２０ａは、リニアモータ１０Ａの各コイル１０２の他端に直接接続されてもよい。この場合、電線２０ａは、収容部３２０、把持部３００及び収容部３１０を順に通って、リニアモータ１０Ａのコイル１０２の他端に接続される。また、電動工具１が備える８個のコイル１０２の接続方法は上記の例に限られない。例えば、リニアモータ１０Ａが備える、並列接続された４つのコイル１０２と、リニアモータ１０Ｂが備える、並列接続された４つのコイル１０２とは直列接続されてもよい。 The number of electric wires 20 included in the power tool 1 is not limited to the above example. Further, in the power tool 1, the connection method between the configurations by the electric wire 20 is not limited to the above example. For example, the electric wire 20a of the power cable 9 may be directly connected to the other end of each coil 102 of the linear motor 10A. In this case, the electric wire 20a passes through the accommodating portion 320, the grip portion 300, and the accommodating portion 310 in this order, and is connected to the other end of the coil 102 of the linear motor 10A. Further, the method of connecting the eight coils 102 included in the power tool 1 is not limited to the above example. For example, the four coils 102 connected in parallel provided by the linear motor 10A and the four coils 102 connected in parallel provided by the linear motor 10B may be connected in series.
　以上のように、本例に係る電動工具１は、ハウジング３の振動を吸収する動吸振器１３を備える。これにより、本例のように、リニアモータ１０の可動子１１０等を含む、比較的重量が大きい往復運動体が往復運動を行う場合であっても、電動工具１の振動を抑制することができる。よって、電動工具１の操作性が向上する。 As described above, the power tool 1 according to this example includes a dynamic vibration absorber 13 that absorbs the vibration of the housing 3. Thereby, as in this example, the vibration of the electric tool 1 can be suppressed even when a relatively heavy reciprocating motion body including the mover 110 of the linear motor 10 or the like performs the reciprocating motion. .. Therefore, the operability of the power tool 1 is improved.
　また、本例では、駆動軸１１が通る把持部３００内に動吸振器１３が位置する。これにより、ハウジング３の振動の発生原因となる往復運動を行う駆動軸１１の近くに動吸振器１３を配置することができる。よって、動吸振器１３は、ハウジング３の振動をより適切に吸収することができる。 Further, in this example, the dynamic vibration absorber 13 is located in the grip portion 300 through which the drive shaft 11 passes. As a result, the Tuned Mass Damper 13 can be arranged near the drive shaft 11 that performs the reciprocating motion that causes the vibration of the housing 3. Therefore, the Tuned Mass Damper 13 can more appropriately absorb the vibration of the housing 3.
　また、本例では、リニアモータ１０Ａは、把持部３００よりも先端工具４側に位置することから、リニアモータ１０Ａから先端工具４に力を伝えやすくなる。よって、リニアモータ１０Ａは先端工具４を効率よく往復運動させることができる。 Further, in this example, since the linear motor 10A is located closer to the tip tool 4 than the grip portion 300, it becomes easy to transmit the force from the linear motor 10A to the tip tool 4. Therefore, the linear motor 10A can efficiently reciprocate the tip tool 4.
　また、本例では、電動工具１は複数のリニアモータ１０を備えることから、電動工具１の性能を向上させることができる。 Further, in this example, since the electric tool 1 includes a plurality of linear motors 10, the performance of the electric tool 1 can be improved.
　また、本例では、把持部３００の前後にリニアモータ１０が設けられている。これにより、リニアモータ１０Ａ及び１０Ｂがともに把持部３００の前側に設けられる場合と比較して、把持部３００を持つユーザの手と先端工具４との間の距離を小さくすることができる。よって、電動工具１の操作性が向上する。 Further, in this example, linear motors 10 are provided before and after the grip portion 300. As a result, the distance between the hand of the user holding the grip portion 300 and the tip tool 4 can be reduced as compared with the case where the linear motors 10A and 10B are both provided on the front side of the grip portion 300. Therefore, the operability of the power tool 1 is improved.
　また、本例では、リニアモータ１０による駆動対象物の往復運動を補助する補助機構１２が、ユーザの手によって把持される把持部３００内に位置する。これにより、ユーザは電動工具１を持ちやすくなる。よって、電動工具１の操作性が向上する。 Further, in this example, the auxiliary mechanism 12 that assists the reciprocating motion of the driven object by the linear motor 10 is located in the grip portion 300 that is gripped by the user's hand. This makes it easier for the user to hold the power tool 1. Therefore, the operability of the power tool 1 is improved.
　また、本例では、動吸振器１３が、ユーザによって把持される把持部３００内に位置する。これにより、ユーザは電動工具１を持ちやすくなる。よって、電動工具１の操作性が向上する。 Further, in this example, the dynamic vibration absorber 13 is located in the grip portion 300 gripped by the user. This makes it easier for the user to hold the power tool 1. Therefore, the operability of the power tool 1 is improved.
　また、本例に係る電動工具１は、逆止弁１４０～１４３及び空気圧増減部１５０を用いてリニアモータ１０を適切に冷却することができる。なお、ブラシレスモータ等の回転式モータを冷却する場合には、モータ軸に冷却ファンを取り付けて、モータ軸の回転に連動させて冷却ファンを回転させることができる。しかしながら、リニアモータ１０を冷却する場合には、回転式モータと同様の構成を採用することはできない。 Further, the power tool 1 according to this example can appropriately cool the linear motor 10 by using the check valves 140 to 143 and the air pressure increase / decrease unit 150. When cooling a rotary motor such as a brushless motor, a cooling fan can be attached to the motor shaft to rotate the cooling fan in conjunction with the rotation of the motor shaft. However, when cooling the linear motor 10, the same configuration as that of the rotary motor cannot be adopted.
　上記の例では、ハウジング３は２分割可能となっていたが、ハウジング３の構成はこれに限られない。例えば、図９に示されるように、把持部３００と、収容部３１０と、収容部３２０とが別体で構成されてもよい。この場合、把持部３００と、収容部３１０及び３２０とは、固定部材９９０等によって連結されてもよい。 In the above example, the housing 3 can be divided into two, but the configuration of the housing 3 is not limited to this. For example, as shown in FIG. 9, the grip portion 300, the accommodating portion 310, and the accommodating portion 320 may be formed as separate bodies. In this case, the grip portion 300 and the accommodating portions 310 and 320 may be connected by a fixing member 990 or the like.
　また、電動工具１は、２つのリニアモータ１０を備えているが、一つリニアモータ１０を備えてもよいし、３つ以上のリニアモータ１０を備えてもよい。 Further, although the electric tool 1 includes two linear motors 10, one linear motor 10 may be provided, or three or more linear motors 10 may be provided.
　また、動吸振器１３は、把持部３００よりも後ろ側に位置してもよい。図１０は、この場合の電動工具１の構成の一例を示す図である。図１０には、上述の図３と同様、ハウジング３の内部の様子の一例が示されている。図１１は、図１０に示される構造の矢視Ｃ－Ｃにおける断面構造の概略を示す図である。 Further, the dynamic vibration absorber 13 may be located behind the grip portion 300. FIG. 10 is a diagram showing an example of the configuration of the power tool 1 in this case. FIG. 10 shows an example of the inside of the housing 3 as in FIG. 3 described above. FIG. 11 is a diagram showing an outline of a cross-sectional structure of the structure shown in FIG. 10 in arrow CC.
　図１０及び１１の例では、ハウジング３は、動吸振器５３を収容する収容部３３０を備える。収容部３３０は収容部３２０の後ろ側において収容部３２０と隣接している。収容部３１０、把持部３００、収容部３２０及び収容部３３０は前後方向に並んでいる。図１０及び１１に示されるハウジング３は、図１等に示される上述のハウジング３の後ろ側の面（収容部３２０の後ろ側の面）に収容部３３０を取り付けた形状となっている。 In the examples of FIGS. 10 and 11, the housing 3 includes an accommodating portion 330 accommodating the tuned mass damper 53. The accommodating portion 330 is adjacent to the accommodating portion 320 behind the accommodating portion 320. The accommodating portion 310, the grip portion 300, the accommodating portion 320, and the accommodating portion 330 are arranged in the front-rear direction. The housing 3 shown in FIGS. 10 and 11 has a shape in which the accommodating portion 330 is attached to the rear surface (the rear surface of the accommodating portion 320) of the housing 3 shown in FIG. 1 and the like.
　図１１に示されるように、動吸振器５３は、上述の動吸振器１３と同様に、質量体５３０と、当該質量体５３０を移動させる２つのバネ５３１とを備える。質量体５３０と２つのバネ５３１は前後方向に沿って並んでいる。一方のバネ５３１は質量体５３０の前側に位置し、他方のバネ５３１は質量体５３０の後ろ側に位置する。各バネ５３１は前後方向に沿って伸縮可能である。 As shown in FIG. 11, the Tuned Mass Damper 53 includes a mass body 530 and two springs 531 for moving the mass body 530, similarly to the above-mentioned Tuned Mass Damper 13. The mass body 530 and the two springs 531 are arranged in the front-rear direction. One spring 531 is located on the front side of the mass body 530, and the other spring 531 is located on the rear side of the mass body 530. Each spring 531 can expand and contract along the front-rear direction.
　２つのバネ５３１の一端は、自由端となっており、質量体５３０の前後方向の両端にそれぞれ接続されている。２つのバネ５３１の他端のそれぞれは、ハウジング３に固定されており、固定端となっている。本例では、２つのバネ５３１の他端のそれぞれは、収容部３３０の内側の面に固定されている。 One end of the two springs 531 is a free end, and is connected to both ends of the mass body 530 in the front-rear direction. Each of the other ends of the two springs 531 is fixed to the housing 3 and serves as a fixed end. In this example, each of the other ends of the two springs 531 is fixed to the inner surface of the accommodating portion 330.
　本例では、動吸振器５３は、把持部３００の後ろ側において、往復運動を行う駆動軸１１の延長線上に位置する。そして、動吸振器５３の２つのバネ５３１及び質量体５３０と、駆動軸１１とは、直線上に並んでいる。ここで、動吸振器５３が駆動軸１１の延長線上に位置するとは、駆動軸１１の長手方向に沿った電動工具１の断面視において、駆動軸１１を長手方向に延長したときに駆動軸１１が動吸振器５３と重なることをいう。また、動吸振器５３の２つのバネ５３１及び質量体５３０と、駆動軸１１とが直線上に並んでいるとは、駆動軸１１の長手方向に沿った電動工具１の断面視において、駆動軸１１を長手方向に延長したときに駆動軸１１が２つのバネ５３１及び質量体５３０と重なることをいう。 In this example, the Tuned Mass Damper 53 is located on the extension line of the drive shaft 11 that performs reciprocating motion on the rear side of the grip portion 300. The two springs 531 and the mass body 530 of the dynamic vibration absorber 53 and the drive shaft 11 are aligned on a straight line. Here, the position of the Tuned Mass Damper 53 on the extension line of the drive shaft 11 means that the drive shaft 11 is extended in the longitudinal direction in the cross-sectional view of the power tool 1 along the longitudinal direction of the drive shaft 11. Overlaps with the Tuned Mass Damper 53. Further, the fact that the two springs 531 and the mass body 530 of the dynamic vibration absorber 53 and the drive shaft 11 are aligned in a straight line means that the drive shaft 11 is aligned in a straight line in the cross-sectional view of the power tool 1 along the longitudinal direction of the drive shaft 11. It means that the drive shaft 11 overlaps with the two springs 531 and the mass body 530 when the 11 is extended in the longitudinal direction.
　動吸振器５３は、質量体５３０が、往復運動体の振動とは逆位相で振動するように構成されている。これにより、動吸振器５３は、往復運動体の振動によってハウジング３に生じる振動を吸収することができる。よって、ユーザによって把持されるハウジング３の振動を小さくすることができる。 The Tuned Mass Damper 53 is configured such that the mass body 530 vibrates in a phase opposite to the vibration of the reciprocating motion body. As a result, the Tuned Mass Damper 53 can absorb the vibration generated in the housing 3 by the vibration of the reciprocating motion body. Therefore, the vibration of the housing 3 gripped by the user can be reduced.
　また、本例では、動吸振器５３は、把持部３００の後ろ側において、往復運動を行う駆動軸１１の延長線上に位置する。これにより、図３等に示されるように、動吸振器１３が把持部３００内に位置する場合と比較して、ハウジング３に生じる振動がより吸収される。よって、ユーザによって把持されるハウジング３の振動をさらに小さくすることができる。 Further, in this example, the Tuned Mass Damper 53 is located on the extension line of the drive shaft 11 that performs reciprocating motion on the rear side of the grip portion 300. As a result, as shown in FIG. 3 and the like, the vibration generated in the housing 3 is more absorbed as compared with the case where the dynamic vibration absorber 13 is located in the grip portion 300. Therefore, the vibration of the housing 3 gripped by the user can be further reduced.
　電動工具１は、直流電源を出力するバッテリ８０を備えてもよい。図１２はバッテリ８０を備える電動工具１の構成の一例を示す図である。図１２には、上述の図３と同様、ハウジング３の内部の様子の一例が示されている。 The power tool 1 may include a battery 80 that outputs a DC power supply. FIG. 12 is a diagram showing an example of the configuration of the power tool 1 including the battery 80. FIG. 12 shows an example of the inside of the housing 3 as in FIG. 3 described above.
　本例の電動工具１では、電源ケーブル９の替わりにバッテリ８０を備える。バッテリ８０は、例えば、ハウジング３の後ろ側の部分（収容部３２０の後ろ側の部分）に対して着脱可能である。バッテリ８０は、例えば、充電可能な二次電池を備える。バッテリ８０は直流電源を出力する。 The power tool 1 of this example is provided with a battery 80 instead of the power cable 9. The battery 80 can be attached to and detached from, for example, a rear portion of the housing 3 (a rear portion of the accommodating portion 320). The battery 80 includes, for example, a rechargeable secondary battery. The battery 80 outputs a DC power supply.
　本例では、ハウジング３の収容部３２０に、バッテリ８０から出力される直流電源に基づいて、リニアモータ１０Ａ及び１０Ｂを駆動する駆動部９０が収容されている。駆動部９０は、把持部３００よりも後ろ側に位置する。駆動部９０は、例えば、基板９１と、当該基板９１に形成された回路構成９２とを備えている。回路構成９２には、例えば、バッテリ８０からの直流電源に基づいて交流電源を生成するインバータ回路が含まれる。回路構成９２で生成された交流電源はリニアモータ１０Ａ及び１０Ｂに供給される。 In this example, the accommodating portion 320 of the housing 3 accommodates the driving unit 90 that drives the linear motors 10A and 10B based on the DC power supply output from the battery 80. The drive unit 90 is located behind the grip unit 300. The drive unit 90 includes, for example, a substrate 91 and a circuit configuration 92 formed on the substrate 91. The circuit configuration 92 includes, for example, an inverter circuit that generates an AC power source based on a DC power source from the battery 80. The AC power generated in the circuit configuration 92 is supplied to the linear motors 10A and 10B.
　駆動部９０からは２本の電線２０ｆ及び２０ｇが延びている。電線２０ｆは、回路構成９２で生成された交流電源の一方の相の交流電圧を伝達する。電線２０ｆは、当該交流電源の他方の相の交流電圧を伝達する。本例では、電源ケーブル９の電線２０ａの替わりに電線２０ｆがリニアモータ１０Ｂの各コイル１０２の一端に接続される（図８参照）。また、電源ケーブル９の電線２０ｂの替わりに電線２０ｇがスイッチ回路７０の一端に接続される（図８参照）。 Two electric wires 20f and 20g extend from the drive unit 90. The electric wire 20f transmits the AC voltage of one phase of the AC power supply generated in the circuit configuration 92. The electric wire 20f transmits the AC voltage of the other phase of the AC power supply. In this example, instead of the electric wire 20a of the power cable 9, the electric wire 20f is connected to one end of each coil 102 of the linear motor 10B (see FIG. 8). Further, instead of the electric wire 20b of the power cable 9, an electric wire 20g is connected to one end of the switch circuit 70 (see FIG. 8).
　図１３は、バッテリ８０を備える電動工具１の他の構成例を示す図である。図１３の例では、電動工具１は、リニアモータ１０Ｂと逆止弁１４２及び１４３を備えていない。収容部３２０には、リニアモータ１０Ｂは収容されておらず、駆動部９０が収容されている。 FIG. 13 is a diagram showing another configuration example of the power tool 1 including the battery 80. In the example of FIG. 13, the power tool 1 does not include the linear motor 10B and the check valves 142 and 143. The linear motor 10B is not housed in the housing unit 320, but the driving unit 90 is housed in the housing unit 320.
　なお、バッテリ８０は、ハウジング３に着脱不可に固定されてもよい。また、バッテリ８０は、充電不可な一次電池を備えてもよい。また、ハウジング３に対するバッテリ８０の取り付け位置は上記の例に限られない。また、バッテリ８０とハウジング３との間がケーブルで接続されてもよい。 The battery 80 may be non-detachably fixed to the housing 3. Further, the battery 80 may include a non-rechargeable primary battery. Further, the mounting position of the battery 80 with respect to the housing 3 is not limited to the above example. Further, the battery 80 and the housing 3 may be connected by a cable.
　リニアモータ１０は、コイル１０２に取り付けられた放熱フィン９５を備えてもよい。図１４は、放熱フィン９５を備えるリニアモータ１０の構成例を示す図である。図１４に示されるリニアモータ１０では、説明の便宜上、コア１０１の枠状部１０１ａと絶縁部材１０３の記載が省略されている。 The linear motor 10 may include heat radiation fins 95 attached to the coil 102. FIG. 14 is a diagram showing a configuration example of a linear motor 10 provided with heat radiation fins 95. In the linear motor 10 shown in FIG. 14, for convenience of explanation, the description of the frame-shaped portion 101a of the core 101 and the insulating member 103 is omitted.
　図１４の例では、各コイル１０２に放熱フィン９５が取り付けられている。また、放熱フィン９５は、コイル１０２の後ろ側に取り付けられている。放熱フィン９５は、例えば、アルミニウム等の熱伝導率が高い金属で構成されている。放熱フィン９５は、例えば、熱伝導率の高い絶縁性接着剤によってコイル１０２に固定される。なお、放熱フィン９５のコイル１０２に対する取付方法はこの限りではない。 In the example of FIG. 14, heat radiation fins 95 are attached to each coil 102. Further, the heat radiation fin 95 is attached to the rear side of the coil 102. The heat radiating fin 95 is made of a metal having high thermal conductivity, such as aluminum. The heat radiating fin 95 is fixed to the coil 102 by, for example, an insulating adhesive having high thermal conductivity. The method of attaching the heat radiation fin 95 to the coil 102 is not limited to this.
　図１５は、放熱フィン９５と、それが取り付けられたコイル１０２を、図１４の矢視Ｄから見た様子の一例を示す図である。図１５に示されるように、放熱フィン９５は、ベース材９５ａと、当該ベース材９５ａの一方面に立設された複数のフィン９５ｂとを備える。フィン９５ｂは突起部とも言える。図１５では、説明の便宜上、フィン９５ｂには斜線が示されている。 FIG. 15 is a diagram showing an example of a state in which the heat radiation fin 95 and the coil 102 to which the heat radiation fin 95 is attached are viewed from the arrow D of FIG. As shown in FIG. 15, the heat radiating fin 95 includes a base material 95a and a plurality of fins 95b erected on one surface of the base material 95a. The fin 95b can also be said to be a protrusion. In FIG. 15, for convenience of explanation, the fins 95b are shown with diagonal lines.
　ベース材９５ａは、例えば板状を成している。各フィン９５ｂは、例えば、一方向に長い板状を成している。本例では、各フィン９５ｂは、その長手方向が上下方向に沿っている。そして、複数のフィン９５ｂは、上下方向に対して直交する方向に沿って、間隔を空けて並べられている。複数のフィン９５ｂは、例えば等間隔に並べられる。なお、複数のフィン９５ｂは、等間隔に並べられなくてもよい。 The base material 95a has, for example, a plate shape. Each fin 95b has, for example, a long plate shape in one direction. In this example, each fin 95b has its longitudinal direction along the vertical direction. The plurality of fins 95b are arranged at intervals along a direction orthogonal to the vertical direction. The plurality of fins 95b are arranged at equal intervals, for example. The plurality of fins 95b do not have to be arranged at equal intervals.
　このように、本例では、コイル１０２に放熱フィン９５が取り付けられていることから、発熱し易いコイル１０２を適切に冷却することができる。 As described above, in this example, since the heat radiating fins 95 are attached to the coil 102, the coil 102 that easily generates heat can be appropriately cooled.
　また　本例では、複数のフィン９５ｂは、上下方向に対して直交する方向に沿って、間隔を空けて並べられている。これにより、リニアモータ１０を冷却する冷却風の流れが、放熱フィン９５によって阻害されにくくなる。 Further, in this example, the plurality of fins 95b are arranged at intervals along the direction orthogonal to the vertical direction. As a result, the flow of the cooling air that cools the linear motor 10 is less likely to be obstructed by the radiating fins 95.
　例えば、前側のリニアモータ１０Ａのコイル１０２に取り付けられる放熱フィン９５に注目する。上側の逆止弁１４０が収容部３１０内に取り込んだ空気は、下側の逆止弁１４１から排気されることから、図１４に示されるように、リニアモータ１０Ａを冷却する冷却風９００は上側から下側に向けて流れる。放熱フィン９５では、複数のフィン９５ｂが、冷却風９００が流れる上下方向に対して直交する方向に沿って間隔を空けて並べられている。これにより、冷却風９００がフィン９５ｂ間を通りやすくなる。よって、冷却風９００の流れが放熱フィン９５によって阻害されにくくなる。その結果、冷却風によるリニアモータ１０の冷却効果が向上する。 For example, pay attention to the heat radiation fin 95 attached to the coil 102 of the linear motor 10A on the front side. Since the air taken in by the upper check valve 140 into the accommodating portion 310 is exhausted from the lower check valve 141, as shown in FIG. 14, the cooling air 900 for cooling the linear motor 10A is on the upper side. It flows downward from. In the heat radiating fins 95, a plurality of fins 95b are arranged at intervals along a direction orthogonal to the vertical direction in which the cooling air 900 flows. This makes it easier for the cooling air 900 to pass between the fins 95b. Therefore, the flow of the cooling air 900 is less likely to be obstructed by the heat radiation fins 95. As a result, the cooling effect of the linear motor 10 by the cooling air is improved.
　なお、放熱フィン９５の形状は上記の例に限らない。また、リニアモータ１０が備える複数のコイル１０２の一部だけに放熱フィン９５が取り付けられてもよい。つまり、リニアモータ１０が備える複数のコイル１０２の少なくとも一つに放熱フィン９５が取り付けられてもよい。また、コイル１０２に対する放熱フィン９５の取り付け位置は上記の例に限られない。例えば、放熱フィン９５は、コイル１０２の前側に取り付けられてもよい。また、一つのコイル１０２に対して複数の放熱フィン９５が取り付けられてもよい。例えば、一つのコイル１０２の前側及び後ろ側のそれぞれに対して放熱フィン９５が取り付けられてもよい。また、図１６に示されるように、各コイル１０２の周囲部には絶縁紙９９５を配置してもよい。そして、絶縁紙９９５上に放熱フィン９５を配置してもよい。 The shape of the heat radiation fin 95 is not limited to the above example. Further, the heat radiation fins 95 may be attached only to a part of the plurality of coils 102 included in the linear motor 10. That is, the heat radiation fin 95 may be attached to at least one of the plurality of coils 102 included in the linear motor 10. Further, the mounting position of the heat radiation fin 95 with respect to the coil 102 is not limited to the above example. For example, the heat radiation fin 95 may be attached to the front side of the coil 102. Further, a plurality of heat radiation fins 95 may be attached to one coil 102. For example, heat dissipation fins 95 may be attached to each of the front side and the rear side of one coil 102. Further, as shown in FIG. 16, insulating paper 995 may be arranged around each coil 102. Then, the heat radiating fins 95 may be arranged on the insulating paper 995.
　上記の例では、電動工具１は、レシプロソーであったが、先端工具を往復運動させる他の手持ちの電動工具であってもよい。例えば、電動工具１は、電動ハンマーであってもよいし、ジグソーであってもよいし、電動ノコギリであってもよい。 In the above example, the power tool 1 was a reciprocating saw, but it may be another hand-held power tool that reciprocates the tip tool. For example, the electric tool 1 may be an electric hammer, a jigsaw, or an electric saw.
　以上のように、電動工具１は詳細に説明されたが、上記した説明は、全ての局面において例示であって、この開示がそれに限定されるものではない。また、上述した各種例は、相互に矛盾しない限り組み合わせて適用可能である。そして、例示されていない無数の例が、この開示の範囲から外れることなく想定され得るものと解される。 As described above, the power tool 1 has been described in detail, but the above description is an example in all aspects, and the disclosure is not limited thereto. In addition, the various examples described above can be applied in combination as long as they do not contradict each other. And it is understood that innumerable examples not illustrated can be assumed without departing from the scope of this disclosure.
　１　電動工具
　２　取付部
　３　ハウジング
　４　先端工具
　１０，１０Ａ，１０Ｂ　リニアモータ
　１２　補助機構
　１３　動吸振器
　２０　電線
　８０　バッテリ
　９０　駆動部
　９５　放熱フィン
　１０２　コイル
　１４０～１４３　逆止弁
　１５０　空気圧増減部
　１５３　第２仕切り部
　３００　把持部 1 Power tool 2 Mounting part 3 Housing 4 Tip tool 10, 10A, 10B Linear motor 12 Auxiliary mechanism 13 Tuned mass damper 20 Electric wire 80 Battery 90 Drive part 95 Heat dissipation fin 102 Coil 140 to 143 Check valve 150 Air pressure increase / decrease part 153 2nd Partition 300 Grip

Claims (13)

  1. 　先端工具を往復運動させる第１リニアモータと、
    　前記第１リニアモータを収容するハウジングと、
    　前記ハウジングの振動を吸収する動吸振器と
    を備える、電動工具。     The first linear motor that reciprocates the tip tool and
    A housing for accommodating the first linear motor and
    An electric tool including a dynamic vibration absorber that absorbs the vibration of the housing.
  2. 　請求項１に記載の電動工具であって、
    　前記ハウジングは把持部を有し、
    　前記第１リニアモータは、前記把持部よりも前記先端工具側に位置する、電動工具。     The power tool according to claim 1.
    The housing has a grip and
    The first linear motor is an electric tool located on the tip tool side of the grip portion.
  3. 　請求項２に記載の電動工具であって、
    　前記把持部よりも、前記先端工具側とは反対側に位置し、前記先端工具を往復運動させる第２リニアモータをさらに備える、電動工具。     The power tool according to claim 2.
    An electric tool further provided with a second linear motor that is located on the side opposite to the tip tool side of the grip portion and reciprocates the tip tool.
  4. 　請求項１に記載の電動工具であって、
    　直流電源を出力するバッテリと、
    　前記直流電源に基づいて、前記第１リニアモータを駆動する駆動部と
    をさらに備え、
    　前記ハウジングは把持部を有し、
    　前記駆動部は、前記把持部よりも、前記先端工具側とは反対側に位置する、電動工具。     The power tool according to claim 1.
    A battery that outputs DC power and
    A drive unit that drives the first linear motor based on the DC power supply is further provided.
    The housing has a grip and
    The drive unit is an electric tool located on the side opposite to the tip tool side of the grip portion.
  5. 　請求項１に記載の電動工具であって、
    　前記ハウジングは把持部を有し、
    　前記把持部内に位置し、バネによる共振を利用して、前記第１リニアモータによる前記先端工具の往復運動を補助する補助機構をさらに備える、電動工具。     The power tool according to claim 1.
    The housing has a grip and
    An electric tool that is located in the grip portion and further includes an auxiliary mechanism that assists the reciprocating motion of the tip tool by the first linear motor by utilizing resonance by a spring.
  6. 　請求項１に記載の電動工具であって、
    　前記ハウジングは把持部を有し、
    　前記動吸振器は、前記把持部内に位置する、電動工具。     The power tool according to claim 1.
    The housing has a grip and
    The dynamic vibration absorber is an electric tool located in the grip portion.
  7. 　請求項１に記載の電動工具であって、
    　前記ハウジングは把持部を有し、
    　前記動吸振器は、前記把持部よりも、前記先端工具側とは反対側に位置する、電動工具。     The power tool according to claim 1.
    The housing has a grip and
    The dynamic vibration absorber is an electric tool located on the side opposite to the tip tool side of the grip portion.
  8. 　請求項７に記載の電動工具であって、
    　前記第１リニアモータによって往復運動させられ、前記把持部内を通る駆動軸を備え、
    　前記第１リニアモータは、前記駆動軸を往復運動させることによって前記先端工具を往復運動させ、
    　前記動吸振器は、前記駆動軸の延長線上に位置する、電動工具。     The power tool according to claim 7.
    A drive shaft that is reciprocated by the first linear motor and passes through the grip portion is provided.
    The first linear motor reciprocates the tip tool by reciprocating the drive shaft.
    The dynamic vibration absorber is an electric tool located on an extension line of the drive shaft.
  9. 　請求項１から請求項７のいずれか一つに記載の電動工具であって、
    　前記第１リニアモータを冷却する冷却機構をさらに備え、
    　前記ハウジングは、前記第１リニアモータを収容する収容部を有し、
    　前記冷却機構は、
    　　前記収容部内に空気を取り込む第１逆止弁と、
    　　前記収容部内の空気を排気する第２逆止弁と、
    　　前記収容部内の空気圧を、前記先端工具の往復運動に連動して増減する空気圧増減部と
    を有し、
    　前記空気圧が減少したとき前記第１逆止弁が前記収容部内に空気を取り込み、前記空気圧が増加したとき前記第２逆止弁が前記収容部内の空気を排気することによって、前記第１リニアモータが冷却される、電動工具。     The power tool according to any one of claims 1 to 7.
    Further provided with a cooling mechanism for cooling the first linear motor,
    The housing has an accommodating portion for accommodating the first linear motor.
    The cooling mechanism
    A first check valve that takes in air into the accommodating portion,
    A second check valve that exhausts the air in the accommodating portion,
    It has an air pressure increase / decrease portion that increases / decreases the air pressure in the accommodating portion in conjunction with the reciprocating motion of the tip tool.
    When the air pressure decreases, the first check valve takes in air into the accommodating portion, and when the air pressure increases, the second check valve exhausts the air in the accommodating portion, thereby causing the first linear motor. Is cooled, power tools.
  10. 　請求項９に記載の電動工具であって、
    　前記第１リニアモータによって往復運動させられる駆動軸を備え、
    　前記第１リニアモータは、前記駆動軸を往復運動させることによって前記先端工具を往復運動させ、
    　前記空気圧増減部は、前記収容部を区分し、前記駆動軸に固定された仕切り部を有し、
    　前記駆動軸の往復運動に連動して前記仕切り部が往復運動することにより、前記空気圧が増減する、電動工具。     The power tool according to claim 9.
    A drive shaft that is reciprocated by the first linear motor is provided.
    The first linear motor reciprocates the tip tool by reciprocating the drive shaft.
    The air pressure increase / decrease portion divides the accommodating portion and has a partition portion fixed to the drive shaft.
    An electric tool in which the air pressure increases or decreases as the partition portion reciprocates in conjunction with the reciprocating motion of the drive shaft.
  11. 　請求項３に記載の電動工具であって、
    　前記第１及び第２リニアモータを冷却する冷却機構と、
    　前記第１及び第２リニアモータによって往復運動させられる駆動軸と
    を備え、
    　前記第１及び第２リニアモータは、前記駆動軸を往復運動させることによって前記先端工具を往復運動させ、
    　前記ハウジングは、
    　　前記第１リニアモータを収容する第１収容部と、
    　　前記第２リニアモータを収容する第２収容部と
    を有し、
    　前記冷却機構は、
    　　前記第１及び第２収容部を区分し、前記駆動軸に固定された仕切り部と、
    　　前記第１収容部内に空気を取り込む第１逆止弁と、
    　　前記第１収容部内の空気を排気する第２逆止弁と、
    　　前記第２収容部内に空気を取り込む第３逆止弁と、
    　　前記第２収容部内の空気を排気する第４逆止弁と
    を有し、
    　前記仕切り部が前記駆動軸とともに第１方向に移動する場合、前記第１収容部内の第１空気圧が増加するとともに前記第２収容部内の第２空気圧が減少し、
    　前記仕切り部が前記駆動軸とともに、前記第１方向とは逆の第２方向に移動する場合、前記第１空気圧が減少するとともに前記第２空気圧が増加し、
    　前記第１空気圧が減少したとき前記第１逆止弁が前記第１収容部内に空気を取り込み、前記第１空気圧が増加したとき前記第２逆止弁が前記第１収容部内の空気を排気することによって、前記第１リニアモータが冷却され、
    　前記第２空気圧が減少したとき前記第３逆止弁が前記第２収容部内に空気を取り込み、前記第２空気圧が増加したとき前記第４逆止弁が前記第２収容部内の空気を排気することによって、前記第２リニアモータが冷却される、電動工具。     The power tool according to claim 3.
    A cooling mechanism for cooling the first and second linear motors,
    It is provided with a drive shaft that is reciprocated by the first and second linear motors.
    The first and second linear motors reciprocate the tip tool by reciprocating the drive shaft.
    The housing is
    A first accommodating portion accommodating the first linear motor and
    It has a second accommodating portion for accommodating the second linear motor, and has a second accommodating portion.
    The cooling mechanism
    The first and second accommodating portions are separated, and the partition portion fixed to the drive shaft and the partition portion are
    A first check valve that takes in air into the first accommodating portion,
    A second check valve that exhausts the air in the first accommodating portion,
    A third check valve that takes in air into the second accommodating portion,
    It has a fourth check valve that exhausts the air in the second accommodating portion.
    When the partition portion moves in the first direction together with the drive shaft, the first air pressure in the first accommodating portion increases and the second air pressure in the second accommodating portion decreases.
    When the partition portion moves together with the drive shaft in a second direction opposite to the first direction, the first air pressure decreases and the second air pressure increases.
    When the first air pressure decreases, the first check valve takes in air into the first accommodating portion, and when the first air pressure increases, the second check valve exhausts the air in the first accommodating portion. As a result, the first linear motor is cooled.
    When the second air pressure decreases, the third check valve takes in air into the second accommodating portion, and when the second air pressure increases, the fourth check valve exhausts the air in the second accommodating portion. A power tool that cools the second linear motor.
  12. 　請求項１から請求項１１のいずれか一つに記載の電動工具であって、
    　前記第１リニアモータは、
    　　コイルと、
    　　前記コイルに取り付けられた放熱フィンと
    を有する、電動工具。     The power tool according to any one of claims 1 to 11.
    The first linear motor is
    With the coil
    A power tool having radiating fins attached to the coil.
  13. 　請求項１に記載の電動工具であって、
    　前記ハウジングは把持部を有し、
    　前記把持部を通る電線をさらに備える、電動工具。     The power tool according to claim 1.
    The housing has a grip and
    A power tool further comprising an electric wire passing through the grip portion.
PCT/JP2020/042795 2019-11-19 2020-11-17 Electric tool WO2021100703A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2021558393A JP7325530B2 (en) 2019-11-19 2020-11-17 Electric tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019208674 2019-11-19
JP2019-208674 2019-11-19

Publications (1)

Publication Number Publication Date
WO2021100703A1 true WO2021100703A1 (en) 2021-05-27

Family

ID=75980571

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/042795 WO2021100703A1 (en) 2019-11-19 2020-11-17 Electric tool

Country Status (2)

Country Link
JP (1) JP7325530B2 (en)
WO (1) WO2021100703A1 (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000263303A (en) * 1999-03-18 2000-09-26 Ballado Investments Inc Chuck with linear motor for axially moving tool
JP2002011676A (en) * 2000-05-23 2002-01-15 Hilti Ag Hand-held tool with electromagnetic hammering mechanism
JP2002144255A (en) * 2000-11-06 2002-05-21 Hitachi Ltd Power tool with linear motor
JP2003250261A (en) * 2002-02-22 2003-09-05 Hitachi Ltd Drive unit and its driving method
JP2004343933A (en) * 2003-05-16 2004-12-02 Matsushita Electric Works Ltd Linear actuator for both vibration and rolling drive, and electric toothbrush using the same
JP2008048564A (en) * 2006-08-21 2008-02-28 Murata Mach Ltd Linear motor and machine tool mounting it
JP2009502535A (en) * 2005-08-03 2009-01-29 ワツカー コンストラクション イクイップメント アクチェンゲゼルシャフト Drill and / or hammer
JP2010012586A (en) * 2008-07-07 2010-01-21 Makita Corp Working tool
JP2012218077A (en) * 2011-04-05 2012-11-12 Makita Corp Electric power tool with linear motor
JP2018117994A (en) * 2017-01-27 2018-08-02 株式会社マキタ Cutting-off tool

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000263303A (en) * 1999-03-18 2000-09-26 Ballado Investments Inc Chuck with linear motor for axially moving tool
JP2002011676A (en) * 2000-05-23 2002-01-15 Hilti Ag Hand-held tool with electromagnetic hammering mechanism
JP2002144255A (en) * 2000-11-06 2002-05-21 Hitachi Ltd Power tool with linear motor
JP2003250261A (en) * 2002-02-22 2003-09-05 Hitachi Ltd Drive unit and its driving method
JP2004343933A (en) * 2003-05-16 2004-12-02 Matsushita Electric Works Ltd Linear actuator for both vibration and rolling drive, and electric toothbrush using the same
JP2009502535A (en) * 2005-08-03 2009-01-29 ワツカー コンストラクション イクイップメント アクチェンゲゼルシャフト Drill and / or hammer
JP2008048564A (en) * 2006-08-21 2008-02-28 Murata Mach Ltd Linear motor and machine tool mounting it
JP2010012586A (en) * 2008-07-07 2010-01-21 Makita Corp Working tool
JP2012218077A (en) * 2011-04-05 2012-11-12 Makita Corp Electric power tool with linear motor
JP2018117994A (en) * 2017-01-27 2018-08-02 株式会社マキタ Cutting-off tool

Also Published As

Publication number Publication date
JPWO2021100703A1 (en) 2021-05-27
JP7325530B2 (en) 2023-08-14

Similar Documents

Publication Publication Date Title
CN105471217B (en) Linear actuator, electric brush, electric cutting machine, and electric inflator
JP5826526B2 (en) Electric tool
US7607229B2 (en) Electric razor
JP5176891B2 (en) Actuator and electric toothbrush using the same
JP4400463B2 (en) Vibration type linear actuator and electric toothbrush using the same
US8214959B2 (en) Actuator and electric toothbrush using the same
WO2010071054A1 (en) Working tool
US8327488B2 (en) Actuator and electric toothbrush using the same
WO2016067532A1 (en) Brushless motor and electrically powered tool
JP5929241B2 (en) Actuator and electric hairdressing beauty instrument
JP2005185067A (en) Vibration-type linear actuator and hair cutter provided with the same
JP7367735B2 (en) Electric tool
JP2019522541A (en) FIXING STRUCTURE FOR ELECTRIC CLEANING TOOL DRIVE
JP2009142980A (en) Electric hand tool device having vibration damping device
JP2009022157A (en) Drive unit for hand tool device
JP2002144255A (en) Power tool with linear motor
JP7365789B2 (en) electric work equipment
WO2021100703A1 (en) Electric tool
JP2016116267A (en) Power tool
JP2016068205A (en) Electric power tool
EP3393021B1 (en) Oscillatory linear actuator and cutting device
CN110425036A (en) A kind of gas-liquid-liquid three-phase flow air exhaust cooling device
US20200198114A1 (en) Electric working machine
JP6115937B2 (en) Compressor motor and control method thereof
JP2022090991A (en) Motor and electric tool

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20890880

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021558393

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20890880

Country of ref document: EP

Kind code of ref document: A1