WO2018088440A1 - Outil électrique - Google Patents

Outil électrique Download PDF

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Publication number
WO2018088440A1
WO2018088440A1 PCT/JP2017/040310 JP2017040310W WO2018088440A1 WO 2018088440 A1 WO2018088440 A1 WO 2018088440A1 JP 2017040310 W JP2017040310 W JP 2017040310W WO 2018088440 A1 WO2018088440 A1 WO 2018088440A1
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WO
WIPO (PCT)
Prior art keywords
housing
region
motor
lock pin
disposed
Prior art date
Application number
PCT/JP2017/040310
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English (en)
Japanese (ja)
Inventor
サーノン スパタクン
健一 河合
Original Assignee
株式会社マキタ
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Filing date
Publication date
Application filed by 株式会社マキタ filed Critical 株式会社マキタ
Publication of WO2018088440A1 publication Critical patent/WO2018088440A1/fr

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    • 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
    • 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
    • B25F5/02—Construction of casings, bodies or handles
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
    • E04G21/08—Internal vibrators, e.g. needle vibrators

Definitions

  • the present invention relates to an electric tool that operates using a motor as a drive source.
  • the housing of such a power tool is provided with an air intake port through which cooling air for cooling the motor flows from the outside.
  • an inlet for cooling air is provided on the lower surface of the motor housing. Cooling air flowing into the housing from the air intake port flows around the motor along a predetermined flow path to cool the motor, and flows out from the exhaust port to the outside of the housing.
  • An object of the present invention is to provide a technique that contributes to measures against foreign matter entering a motor in an electric tool using a motor as a drive source.
  • an electric tool including a housing, a motor, an air inlet, and a partition.
  • the motor is accommodated in the housing.
  • the intake port is provided in the housing, and is configured such that cooling air for cooling the motor can flow into the housing from the outside.
  • the partition portion is disposed on a flow path of cooling air from the intake port to the motor in the housing, and among the regions in the housing, a first region communicating with the outside via the intake port, and a second in which the motor is disposed. It is comprised so that an area
  • the partition is configured to allow passage of cooling air from the first region to the second region while preventing passage of liquid or dust.
  • electric tool here is also called “electric tool” and refers to a general tool that uses electric power as power, such as a tool used for work (for example, a concrete vibrator, a sander, a polisher, a grinder), Includes horticultural tools (eg, mowers, hedge trimmers, chain saws, etc.).
  • a tool used for work for example, a concrete vibrator, a sander, a polisher, a grinder
  • Includes horticultural tools eg, mowers, hedge trimmers, chain saws, etc.
  • the housing is a part also called a tool body.
  • the housing only has to have at least a motor while having an air inlet.
  • the housing may be a one-layer housing or a two-layer housing.
  • the housing having a single layer structure may be formed by connecting a plurality of portions.
  • the housing having a two-layer structure typically includes an outer housing part that forms an outer shell of the electric tool, and an inner housing part that is at least partially accommodated in the outer housing part and that accommodates at least some internal components. It is a waste.
  • the motor may be disposed in the inner housing part, or may be disposed in the outer housing part and outside the inner housing part. In any case, it is understood that the motor is housed in the housing.
  • the motor may be a DC motor that uses a battery as a power source, or an AC motor that uses an external AC power source as a power source.
  • the motor may be a motor having a brush or a so-called brushless motor not having a brush.
  • the configuration of “blocking the passage of liquid and dust” means either a configuration that completely prevents the passage of liquid and dust, or a configuration that does not completely prevent the passage of fluid and dust but makes passage difficult Is also included.
  • “allowing the passage of cooling air” includes a configuration that allows the cooling air to pass while giving a certain amount of flow resistance.
  • a labyrinth structure, a film, a sponge-like member, etc. are employable suitably.
  • the cooling air that has flowed into the first region in the housing from the air inlet can pass through the partition and can flow into the second region where the motor is disposed.
  • the partition portion prevents passage of the foreign matter. Therefore, according to the electric power tool of this aspect, it is possible to protect the motor by suppressing the foreign matter from entering the motor disposed in the second region while maintaining the cooling effect of the motor by the cooling air.
  • the partition portion may have a first labyrinth structure.
  • the labyrinth structure typically means a structure that forms a flow path that meanders in a maze shape.
  • the partition part having the labyrinth structure can effectively prevent foreign substances from entering while allowing the cooling air to pass therethrough.
  • the first labyrinth structure may include a wall portion, a communication port, and a baffle wall.
  • the wall section partitions the first area and the second area.
  • the communication port is formed in the wall portion and communicates the first region and the second region.
  • the baffle wall is provided adjacent to the communication port. At least a part of the baffle wall extends in a direction crossing the opening direction of the communication port.
  • at least a part of the flow path formed by the first labyrinth structure is transferred from the first region to the second region in a state where the electric tool is placed in a normal use posture. It may extend upward.
  • the electric power tool isolates a third region, in which electric parts different from the motor are arranged, in a region in the housing, in a substantially sealed manner with respect to the first region.
  • a part may be further provided.
  • Examples of “electrical parts different from motors” include switches, fuses, capacitors, and the like.
  • many of the electrical components used in power tools do not require cooling as much as a motor, but may become defective when wet.
  • by arranging such an electrical component in the third region the electrical component can be more reliably protected by the isolation portion.
  • the housing may have a second labyrinth structure provided around the air inlet.
  • the second labyrinth structure may include a baffle wall provided adjacent to the air inlet. At least a part of the baffle wall of the second labyrinth structure extends in a direction crossing the opening direction of the intake port.
  • the partition portion is configured such that the entry direction of the cooling air from the first region to the second region intersects the entry direction of the cooling air from the outside to the first region. May be.
  • the electric tool may be a concrete vibrator configured to be detachable from a vibrating shaft provided with a flexible shaft and a flexible hose that rotatably holds the flexible shaft.
  • the electric power tool may further include a spindle, a hose connecting portion, a lock pin, an operation lever, and an urging spring.
  • the spindle is configured to rotationally drive the flexible shaft.
  • the hose connection part has a connection hole extending coaxially with the rotation axis of the spindle.
  • the lock pin is held by the hose coupling part so as to be movable in a radial direction perpendicular to the rotation axis.
  • the operation lever is rotatably connected to the lock pin, and is disposed at a first position where the lock pin protrudes into the connection hole and can be engaged with the flexible hose, and radially outward from the first position. It is comprised so that it may move between the 2nd positions which cannot engage with a flexible hose.
  • the biasing spring biases the lock pin in the direction from the second position toward the first position.
  • the housing is a drain provided in a bottom wall portion disposed on a lower side of the wall portion defining the first region when the electric tool is placed in a normal use posture. You may have a mouth.
  • FIG. 3 is an enlarged view of a front end portion of the concrete vibrator of FIG. 2, and is a cross-sectional view for explaining a lever disposed at a first operation position. It is sectional drawing for demonstrating the lever in a 2nd operation position in the state from which the vibration rod was removed.
  • concrete vibrator 1 is illustrated as an example of an electric tool.
  • the outer shell of the concrete vibrator 1 is formed by a long and generally cylindrical housing 10.
  • One end portion of the housing 10 in the long axis direction (the left end portion in FIG. 1) is configured so that the vibrating rod 8 can be attached and detached.
  • a power cable 7 for connecting to an external AC power source is connected to the other end (the right end in FIG. 1) of the housing 10 in the long axis direction.
  • a belt 9 having hooks 92, 92 at both ends can be attached to and detached from the housing 10. Specifically, from the outer surfaces of both end portions in the major axis direction of the housing 10, the locking portions 22 and 23 to which the hooks 92 and 92 can be locked are exposed.
  • the locking portions 22 and 23 are made of metal, and are arranged along a straight line extending in the long axis direction of the housing 10.
  • a power button 21 that slightly protrudes from the outer surface of the housing 10 is provided in the vicinity of the locking portion 23.
  • the concrete vibrator 1 is suspended from an operator's shoulder by a belt 9 attached to the housing 10 and adjusted in length by a buckle 91 so that the long axis direction of the housing 10 is substantially horizontal.
  • the rod 8 is used in the state of being placed in front. Therefore, for the sake of convenience, with regard to the direction of the concrete vibrator 1, hereinafter, the longitudinal direction of the housing 10 is defined as the front-rear direction, the side on which the vibrating rod 8 is mounted is defined as the front side, and the side on which the power cable 7 is provided is defined as the rear side. To do. Further, the side disposed on the upper side when suspended (the side on which the locking portions 22 and 23 are provided) is defined as the upper side, and the side disposed on the lower side is defined as the lower side.
  • the concrete vibrator 1 drives the motor 3 (see FIG. 2) accommodated in the housing 10 in response to the pressing operation of the power button 21, and vibrates the vibrating rod 8 inserted into the ready-mixed concrete. It is configured to compact green concrete.
  • the front locking portion 22 is formed in an inverted U shape so as to form a lateral hole that is long in the left-right direction between the front locking portion 22 and the outer surface of the housing 10. For this reason, the hook 92 latched by the latching
  • the housing 10 includes three parts: a motor housing 101, a front housing 102, and a rear housing 103.
  • the motor housing 101 is disposed at the center in the front-rear direction (long axis direction of the housing 10).
  • the front housing 102 is connected to the front side of the motor housing 101.
  • the rear housing 103 is connected to the rear side of the motor housing 101.
  • the motor housing 101 is made of resin and is formed in a cylindrical shape. In the center of the rear end portion of the motor housing 101, a bearing holding portion 101B that holds a bearing 37 of the motor 3 to be described later is provided.
  • the front housing 102 is configured as a gear housing, and includes a first gear housing 11 and a second gear housing 12 made of metal, and a rubber cover 129.
  • the first gear housing 11 arranged on the rear side is fixed to the front side of the motor housing 101 with four first screws (not shown).
  • the second gear housing 12 arranged on the front side is fixed to the front side of the first gear housing 11 with four second screws (not shown).
  • the second gear housing 12 is formed in a cylindrical shape having a smaller diameter than the motor housing 101.
  • the outer surface of the front housing 102 (first and second gear housings 11 and 12) and at least a part of the first screw and the second screw are covered with a rubber cover 129. That is, the cover 129 reduces the area where the metal front housing 102 is exposed to the outside.
  • the locking portion 22 to which the hook 92 of the belt 9 is locked is formed integrally with the first gear housing 11 and protrudes upward from a through hole formed in the cover 129.
  • a first leg portion 11 ⁇ / b> L that protrudes downward is integrally formed at the lower end portion of the first gear housing 11.
  • the first leg portion 11L protrudes downward from a through hole formed in the cover 129. In this manner, since the locking portion 22 and the first leg portion 11L are inserted through the through holes of the cover 129, the cover 129 is prevented from moving forward with respect to the housing 10.
  • the rear housing 103 has two flanges 103C protruding radially inward at the front end.
  • two grooves 101 ⁇ / b> C that are recessed radially inward are formed on the outer peripheral surface of the rear end portion of the motor housing 101.
  • the rear housing 103 includes a left portion 103 ⁇ / b> A and a right portion 103 ⁇ / b> B that are divided into left and right halves.
  • the left portion 103 ⁇ / b> A and the right portion 103 ⁇ / b> B are connected by screws 103 ⁇ / b> D in a state where the flange 103 ⁇ / b> C is fitted into the groove 101 ⁇ / b> C from the left and right, and the rear end portion of the motor housing 101 is sandwiched between the front end portions of the rear housing 103.
  • the rear housing 103 can be easily connected to the motor housing 101 to which the internal parts have been previously assembled.
  • a second leg portion 103L protruding downward is formed at the rear lower end portion of the rear housing 103 (the left portion 103A and the right portion 103B).
  • the concrete vibrator 1 is placed on the ground or the like in a stable posture by the first leg portion 11L and the second leg portion 103L.
  • the inner region (spatial region) of the housing 10 is mainly divided into three regions: a motor housing region 105, an intake region 106, and an isolation region 107.
  • the motor accommodating area 105 is an area that occupies the front side portion of the inner area of the housing 10.
  • the motor housing area 105 can also be referred to as an internal area of the motor housing 101 and the front housing 102.
  • the intake area 106 is an area behind the motor accommodation area 105.
  • the motor housing area 105 and the intake area 106 are partitioned by the first partition wall 14.
  • the isolation region 107 is a region on the rear side of the intake region 106 and occupies the rear end portion of the inner region of the housing 10.
  • the intake area 106 and the isolation area 107 are partitioned by the second partition wall 18.
  • the intake area 106 and the isolation area 107 can also be referred to as an internal area of the rear housing 103.
  • the motor housing area 105 is an area where at least the motor 3 is arranged. As shown in FIG. 2, in the present embodiment, a drive mechanism for the vibrating rod 8 such as the spindle 4 is also arranged in the motor housing area 105.
  • an AC motor is employed as the motor 3.
  • the motor 3 is arranged such that the motor shaft 31 extends in the long axis direction (front-rear direction) of the housing 10.
  • the front end portion and the rear end portion of the motor shaft 31 are rotatably supported by bearings 36 and 37 in the motor housing region 105.
  • the front end portion of the motor shaft 31 projects forward from the front bearing 36, and a drive gear 32 is formed on the outer periphery thereof.
  • a fan 35 is fixed between the bearing 36 on the front side of the motor shaft 31 and the main body (stator and rotor) of the motor 3.
  • the fan 35 rotates with the motor shaft 31 as the motor 3 is driven, thereby forming a flow of cooling air for cooling the motor 3.
  • a plurality of air inlets 27 are provided on the side surface of the rear housing 103.
  • the air inlets 27 are formed in a rectangular shape that is long in the front-rear direction, and are arranged in parallel in the vertical direction.
  • a plurality of exhaust ports 28 are arranged in the vertical direction on the side surface of the front housing 102.
  • the exhaust port 28 is provided in the cover 129 at a position corresponding to the first through hole provided in the side surface of the first gear housing 11 and the first through hole, A second through hole communicating with the first through hole is formed.
  • the intake port 27 and the exhaust port 28 provided on the left side surface are shown, but the intake port 27 and the exhaust port 28 are also provided symmetrically on the right side surface.
  • the cooling air flows into the housing 10 from the air inlet 27 and flows forward around the motor 3, and then the air outlet 28 (the first through hole of the first gear housing 11 and the second through hole of the cover 129). ) To the outside of the housing 10. That is, the fan 35 forms a flow of cooling air that flows in the housing 10 along a flow path from the intake port 27 to the exhaust port 28 via the motor 3.
  • the first partition wall 14 is disposed on the cooling air flow path, which will be described in detail later.
  • a second gear housing 12 is disposed at the front end of the housing 10.
  • the second gear housing 12 is formed with a connecting hole 121 having a circular cross section extending in the front-rear direction.
  • the spindle 4 is disposed in the connection hole 121.
  • the rotation axis A of the spindle 4 extends in parallel (in the front-rear direction) with the rotation axis of the motor shaft 31.
  • the spindle 4 is disposed below the motor shaft 31 and is rotatably supported by bearings 46 and 47 at the center and the rear end thereof.
  • a fitting hole 40 extending coaxially with the rotation axis A of the spindle 4 is formed at the tip (front end) of the spindle 4.
  • a flexible shaft (not shown) of the vibrating rod 8 can be fitted into the fitting hole 40.
  • a driven gear 42 is formed on the outer periphery of the rear portion of the spindle 4. The driven gear 42 meshes with the drive gear 32 of the motor shaft 31. Therefore, the spindle 4 is rotationally driven as the motor 3 is driven.
  • the vibrating bar 8 typically includes a flexible hose 81, a flexible shaft (not shown), an unbalancer (not shown), and a tip cap (not shown).
  • the flexible shaft is rotatably disposed in the flexible hose 81.
  • the unbalancer is connected to the tip of the flexible shaft within the flexible hose 81.
  • the tip cap is placed on the tip of the flexible hose 81.
  • the base end portion of the flexible hose 81 is fitted into the connection hole 121, and the base end portion of the flexible shaft (not shown) is fitted into the fitting hole 40 of the spindle 4. Mated. Furthermore, the flexible hose 81 is fixed to the second gear housing 12 by the lock mechanism 6, whereby the mounting of the vibrating rod 8 is completed.
  • the lock mechanism 6 will be described in detail later.
  • the intake area 106 As described above, a plurality of air inlets 27 are formed on the side surface of the rear housing 103 (see FIG. 1). As shown in FIG. 3, the intake area 106 is an area communicating with the outside through the intake port 27 in the internal area of the housing 10. In the intake area 106, wiring (not shown) for connecting the motor 3 and electric components arranged in the isolation area 107 described later is arranged, but the electric parts themselves are not arranged.
  • the left and right side wall portions 270 of the rear housing 103 in which the air inlet 27 is formed have a labyrinth structure.
  • baffle walls 273 are provided on the inner peripheral surfaces of the left and right side wall portions 270 adjacent to the air inlets 27.
  • the baffle wall 273 is long in the front-rear direction corresponding to the air inlet 27 and is a wall portion formed in a substantially L-shaped cross section as shown in FIG. 4, and includes a horizontal portion 273A and a facing portion 273B.
  • the horizontal portion 273 ⁇ / b> A is a portion that protrudes rightward or leftward from the lower side of the air inlet 27 provided in the left and right side wall portions 270 inside the housing 10.
  • the facing portion 273B is a portion that bends and extends upward from the horizontal portion 273A (that is, in a direction intersecting the opening direction of the intake port 27).
  • the facing portion 273 ⁇ / b> B is disposed inside the air inlet 27 so as to face the air inlet 27.
  • the outside of the housing 10 and the intake area 106 are maze-like passages (shown by arrows in FIG. 4) that meander through the gap between the baffle walls 273 adjacent in the vertical direction from the intake port 27 to the intake area 106. ). More specifically, the passage is defined by a region 271 between the upper and lower adjacent intake ports 27 in the side wall portion 270, the horizontal portion 273A of the baffle wall 273, and the facing portion 273B. The passage once extends rightward or leftward from the air inlet 27 toward the inside of the housing 10, and then bends upward along the facing portion 273B, and further rightward or leftward along the upper horizontal portion 273A. Bent toward the opening to open to the intake area 106.
  • the cooling air flows from the intake port 27 and flows into the intake area 106 while meandering the passage.
  • liquids such as rainwater and ready-mixed concrete droplets and dust such as dust are captured by colliding with or contacting the baffle wall 273 and are prevented from entering the intake area 106.
  • the passage since the passage includes a portion that bends upward along the facing portion 273 ⁇ / b> B, it is difficult for the liquid that has entered the passage to reach the intake region 106. Further, the liquid dammed up by the facing portion 273B flows on the horizontal portion 273A and is easily discharged from the intake port 27.
  • two drain ports 15 are formed in the bottom wall portion of the rear housing 103 that defines the intake region 106.
  • the drain port 15 is a small through-hole compared to the intake port 27.
  • the drain port 15 is provided for discharging liquid from the intake area 106 to the outside when liquid such as rainwater enters the intake area 106 despite being blocked by the baffle wall 273.
  • the concrete vibrator 1 is usually used or placed with the bottom wall portion facing down, so that the liquid can easily flow out from the drain port 15.
  • the 1st partition wall 14 that divides the intake area 106 and the motor accommodation area 105 will be described with reference to FIG. 3.
  • the 1st partition wall 14 is comprised as a wall part which has a labyrinth structure similarly to the left-right side wall part 270 in which the inlet port 27 was formed.
  • the first partition wall 14 is disposed on the rear side of the bearing holding portion 101 ⁇ / b> B provided at the center of the rear end portion of the motor housing 101, and forms the front end surface of the rear housing 103.
  • the first partition wall 14 includes a vertical wall 141, a plurality of communication ports 142, and a plurality of baffle walls 143.
  • the vertical wall 141 extends so as to be orthogonal to the rotation axis of the motor shaft 31 (in the vertical direction) and is connected to the inner peripheral surface of the housing 10.
  • the communication port 142 is a rectangular through-hole formed in the vertical wall 141 and extending in the left-right direction, and is arranged in parallel in the vertical direction.
  • the baffle wall 143 is a wall portion that is long in the left-right direction corresponding to the communication port 142 and has a substantially L-shaped cross section.
  • the baffle wall 143 includes a horizontal portion 143A and a facing portion 143B.
  • the horizontal portion 143A is a portion protruding from the upper side of the communication port 142 toward the rear.
  • the facing portion 143B is a portion that bends and extends downward from the horizontal portion 143A.
  • the facing portion 143 ⁇ / b> B is disposed so as to intersect the opening direction (front-rear direction) of the communication port 142, and faces the communication port 142 on the rear side of the communication port 142.
  • the vertical width of the first partition wall 14 in the range where the communication port 142 and the baffle wall 143 are disposed is set to be larger than the vertical width of the bearing holding portion 101B.
  • the intake area 106 and the motor housing area 105 communicate with each other via a labyrinth-like passage (shown by an arrow in FIG. 3) that meanders from the gap between the baffle walls 143 adjacent in the vertical direction to the communication port 142. is doing. More specifically, the passage is defined by a region 141A between the vertically adjacent communication ports 142 of the vertical wall 141, a horizontal portion 143A of the baffle wall 143, and a facing portion 143B. The passage once extends rearward from the gap between the opposing portions 143B adjacent in the vertical direction toward the inside of the housing 10, and then bends upward along the region 141A and further bends rearward along the upper horizontal portion 143A. As a result, the intake area 106 is opened.
  • a labyrinth-like passage shown by an arrow in FIG. 3
  • the cooling air flowing into the intake area 106 from the intake port 27 flows into the motor housing area 105 while meandering the passage.
  • the vertical width of the first partition wall 14 in which the communication port 142 and the baffle wall 143 are disposed is larger than the vertical width of the bearing holding portion 101B, and thus has passed through the passage.
  • the cooling air can surely flow into the motor housing area 105.
  • the liquid and dust that have flowed into the intake area 106 are captured by colliding with or contacting the baffle wall 143, and are prevented from entering the motor accommodation area 105. Thereby, the motor 3 can be effectively protected from foreign matters such as liquid and dust while maintaining the cooling effect of the motor 3 by the cooling air.
  • the passage since the passage includes a portion that bends upward along the vertical wall 141 (region 141A), it is difficult for the liquid that has entered the passage to enter the motor accommodating region 105. Even when the liquid enters the motor housing area 105, the liquid flows down the vertical wall 141 (area 141 ⁇ / b> A) and is easily discharged from the gap of the baffle wall 143.
  • the baffle wall 273 is also provided around the intake port 27, so that liquid or dust itself is effectively suppressed from entering the intake region 106 from the intake port 27.
  • the cooling from the outside of the housing 10 to the intake area 106, the cooling air, the liquid, and the dust from the entrance direction (also referred to as the outflow direction from the exit of the passage in the labyrinth structure) from the intake area 106 to the motor housing area 105 Wind, liquid, and dust entry directions (which can be said to be inflow directions to the entrance of the passage in the labyrinth structure) intersect.
  • the internal structure of the isolation region 107 will be described with reference to FIG.
  • electrical parts different from the motor 3 are arranged in the isolation region 107.
  • a switch 210 that is switched on and off by pressing the power button 21 is disposed in the isolation region 107.
  • a fuse, a capacitor, and the like are also arranged in the isolation region 107. These electrical components are appropriately connected to the motor 3 via wiring (not shown) passing through the intake area 106.
  • the second partition wall 18 that partitions the intake area 106 and the isolation area 107 will be described with reference to FIG.
  • the second partition wall 18 is configured to isolate the isolation region 107 from the intake region 106 in a substantially sealed manner.
  • the second partition wall 18 extends so as to be orthogonal to the rotation axis of the motor shaft 31 (in the vertical direction) and is connected to the inner peripheral surface of the housing 10.
  • the second partition wall 18 is formed as a partition wall having no communication port other than the through-hole 181 for wiring.
  • the through-hole 181 for wiring is substantially blocked by inserting the wiring. Therefore, it is almost impossible for cooling air, liquid, or dust flowing into the intake area 106 to pass through the second partition wall 18. For this reason, even if liquid or dust enters the intake area 106 via the intake port 27, the electrical components arranged in the isolation area 107 can be reliably protected by the second partition wall 18.
  • the lock mechanism 6 configured to fix the vibrating rod 8 (more specifically, the flexible hose 81) to the housing 10 (second gear housing 12). explain.
  • the lock mechanism 6 is provided at the front end portion of the concrete vibrator 1.
  • a protruding portion 123 formed in a prismatic shape as a part of the second gear housing 12 protrudes upward through an opening formed on the upper surface of the cover 129.
  • the second gear housing 12 is formed with a guide hole 13 penetrating from the upper surface of the protruding portion 123 to the connection hole 121 in the vertical direction (in a direction perpendicular to the rotation axis A).
  • the upper part extending in the protruding portion 123 is formed with a smaller diameter than the lower part.
  • an upper portion extending in the protruding portion 123 is referred to as a small diameter portion 131 and a lower portion is referred to as a large diameter portion 132.
  • An annular stepped portion 133 is formed at the boundary between the small diameter portion 131 and the large diameter portion 132 in a bottom view.
  • a pair of guide grooves 135 having a U-shaped cross section are formed on the upper surface of the protruding portion 123. The pair of guide grooves 135 respectively extend in the left-right direction from the left and right of the guide hole 13 to the left and right ends of the protruding portion 123.
  • the lock mechanism 6 includes a lock pin 61, an operation lever 62, and an urging spring 63.
  • the lock pin 61 is configured to be slidable in the guide hole 13 of the second gear housing 12.
  • the operation lever 62 has a first position (see FIG. 5) where the lock pin 61 can be engaged with the flexible hose 81 and a second position where the lock pin 61 cannot be engaged with the flexible hose 81 (see FIG. 6). It is comprised so that it may move between.
  • the urging spring 63 is arranged to urge the lock pin 61 in the direction from the second position toward the first position.
  • the lock pin 61 includes a shaft portion 611 and an engaging portion 613.
  • the shaft portion 611 is formed to have substantially the same diameter as the small diameter portion 131 of the guide hole 13.
  • the engaging portion 613 is formed to have a larger diameter than the shaft portion 611 and substantially the same diameter as the large diameter portion 132.
  • the lock pin 61 is disposed so that the shaft portion 611 extends in the vertical direction in the small diameter portion 131, and the engagement portion 613 is disposed in the large diameter portion 132, so that the inside of the guide hole 13 extends in the vertical direction. It is possible to slide.
  • the entire length of the lock pin 61 is longer than the guide hole 13, and the shaft portion 611 is longer than the small diameter portion 131.
  • a through hole extending in the left-right direction is formed at the upper end of the shaft portion 611.
  • a connecting pin 65 is rotatably inserted into the through hole.
  • the left and right end portions of the connecting pin 65 protrude to the left and right of the shaft portion 611.
  • the left and right end portions of the connecting pin 65 are disposed above the protruding portion 123 or in a guide groove 135 formed on the upper surface of the protruding portion 123 according to the vertical position of the lock pin 61 with respect to the second gear housing 12.
  • the lock pin 61 and the connecting pin 65 are made of metal.
  • the engaging portion 613 is a portion configured to be able to engage with an engaging hole 810 provided in the flexible hose 81 when the lock pin 61 is disposed at the first position. For this reason, the engaging portion 613 is formed to have substantially the same diameter as the engaging hole 810.
  • the operation lever 62 is connected to the lock pin 61 so as to be rotatable between a first operation position (see FIGS. 1 and 5) and a second operation position (see FIG. 6) around the connection pin 65. ing.
  • the operation lever 62 places the lock pin 61 in the first position at the first operation position. Further, the operation lever 62 places the lock pin 61 at the second position in the second operation position.
  • the direction of the operation lever 62 is defined with reference to the operation lever 62 when in the first operation position shown in FIGS. 1 and 5 for convenience.
  • the operation lever 62 is configured as a lever lever.
  • the operation lever 62 includes a pair of guide parts 621, a connection part 623, and a knob part 625.
  • the guide part 621 and the connection part 623 are made of metal, and the knob part 625 is made of rubber.
  • Each of the pair of guide portions 621 is formed in a substantially rectangular shape in a side view, and is disposed opposite to the left and right of the protruding portion 123.
  • the left and right end portions of the connecting pin 65 are fixed at positions deviated downward and rearward from the center of the pair of guide portions 621.
  • the connecting pin 65 is rotatably inserted into the shaft portion 611.
  • a curved surface is formed at a corner portion connecting the lower end surface and the front end surface of the guide portion 621. The curved surface functions as a contact surface 622 that contacts the upper surface of the second gear housing 12 when the operation lever 62 rotates.
  • the connecting portion 623 is disposed substantially horizontally above the protruding portion 123 and connects the upper ends of the pair of guide portions 621.
  • the connecting portion 623 extends obliquely upward and rearward from the rear end of the guide portion 621 so as to intersect with the opposing direction of the guide portion 621.
  • the knob portion 625 is formed integrally with the connection portion 623 and covers the outer surface of the rear portion of the connection portion 623.
  • the urging spring 63 is composed of a compression coil spring.
  • the urging spring 63 is disposed on the shaft portion 611 of the lock pin 61 and is disposed in the large-diameter portion 132 of the guide hole 13 in a constantly compressed state.
  • the upper end and the lower end of the biasing spring 63 are in contact with the stepped portion 133 between the small diameter portion 131 and the large diameter portion 132 and the upper end surface of the engaging portion 613 of the lock pin 61, respectively.
  • the operation of the lock mechanism 6 will be described.
  • the guide portion 621 is held in a posture in which the lower end surface is in contact with the upper surface of the second gear housing 12.
  • the lock pin 61 connected to the guide portion 621 via the connection pin 65 is disposed at the first position.
  • the first position corresponds to the lowest position in the sliding range of the lock pin 61 (position closest to the rotation axis A of the spindle 4).
  • the engaging portion 613 protrudes from the large diameter portion 132 into the connecting hole 121.
  • the length of the lock pin 61 is set so that the protruding length of the engaging portion 613 into the connecting hole 121 is larger than the thickness of the flexible hose 81.
  • the proximal end portion (rear end portion) of the flexible hose 81 is formed with engagement holes 810 having substantially the same diameter as the engagement portions 613 at three locations in the circumferential direction. Therefore, the operator turns the lock pin 61 by rotating the operation lever 62 to the first operation position in a state where any one of the three engagement holes 810 is disposed below the large-diameter portion 132. The engagement portion 613 can be engaged with the engagement hole 810 by moving to the first position. As a result, the flexible hose 81 is fixed to the second gear housing 12. From this, the first position of the lock pin 61 can be rephrased as an engageable position.
  • the biasing spring 63 is held between the stepped portion 133 and the engaging portion 613 in a compressed state, and the lock pin 61 is directed downward. (In other words, toward the rotation axis A or toward the inside of the flexible hose 81). For this reason, even when an external force is applied to the flexible hose 81, the lock pin 61 is pushed up, and the engagement portion 613 can be prevented from being detached from the engagement hole 810.
  • the lock pin 61 is lifted upward while sliding in the guide hole 13 against the biasing force of the biasing spring 63.
  • the operation lever 62 is rotated to the second operation position shown in FIG. 6, the lock pin 61 is disposed at the second position.
  • the second position corresponds to the uppermost position in the sliding range of the lock pin 61 (the position farthest from the rotation axis A of the spindle 4).
  • the entire engaging portion 613 is disposed within the large diameter portion 132 and does not protrude into the connecting hole 121. For this reason, the engaging part 613 cannot be engaged with the flexible hose 81. From this, the second position of the lock pin 61 can be rephrased as an unengageable position.
  • FIG. 6 shows a state where the vibrating bar 8 has already been removed.
  • the operator mounts the vibrating bar 8 again, the operator aligns the engagement hole 810 with the operation lever 62 disposed at the second operation position, and rotates the operation lever 62 to the first operation position. Then, the lock pin 61 may be engaged with the flexible hose 81 by moving to the first position (see FIG. 5).
  • a method for mounting a vibration rod in a conventional concrete vibrator for example, a method is known in which a flexible shaft is screwed to a spindle and fixed, and a flexible hose is fixed to a tool body with a nut. Further, for example, a method is known in which a lock pin is directly moved in the vertical direction to be engaged with an engagement hole provided in a flexible hose.
  • the operator simply inserts or pulls the vibrating bar 8 into the connecting hole 121 and rotates the operating lever 62 to vibrate the second gear housing 12.
  • the rod 8 can be easily attached and detached.
  • the lever-type operation lever 62 moves the lock pin 61 between a position where the lock pin 61 can be engaged with the flexible hose 81 and a position where the lock hose 81 cannot be engaged. Compared to the configuration, the lock pin 61 can be moved more easily and with a smaller force.
  • the concrete vibrator 1 of the present embodiment is provided with the first partition wall 14 that partitions the motor housing region 105 and the intake region 106 in the inner region of the housing 10.
  • the first partition wall 14 is disposed on the flow path of the cooling air from the air inlet 27 to the motor 3 and has a labyrinth structure that allows the cooling air to pass while preventing the passage of liquid or dust. Therefore, according to the concrete vibrator 1 of the present embodiment, while maintaining the cooling effect of the motor by the cooling air, the entry of the foreign matter to the motor 3 disposed in the motor housing area 105 is effectively suppressed, and the motor 3 is protected. can do.
  • an isolation region 107 in which electric parts (such as the switch 210) different from the motor 3 are disposed in the inner region of the housing 10 is substantially separated from the intake region 106.
  • a second partition wall 18 that is hermetically isolated is provided. Therefore, the cooling as much as the motor 3 is not required, but the electrical components that may cause problems when wet with the liquid are arranged in the isolation region 107, so that the electrical components are more reliably protected by the second partition wall 18. can do. Further, it is possible to reduce costs such as a protective coating process for electrical components performed when the second partition wall 18 is not provided.
  • the concrete vibrator 1 is a configuration example corresponding to the “electric tool” of the present invention.
  • the housing 10, the motor 3, and the intake port 27 are configuration examples corresponding to the “housing”, “motor”, and “intake port” of the present invention, respectively.
  • the intake area 106, the motor accommodating area 105, and the isolation area 107 are configuration examples corresponding to the “first area”, “second area”, and “third area” of the present invention, respectively.
  • the first partition wall 14 and the second partition wall 18 are configuration examples corresponding to the “partition section” and the “isolation section” of the present invention, respectively.
  • the spindle 4, the second gear housing 12, the lock pin 61, the operation lever 62, and the urging spring 63 are respectively “spindle”, “hose coupling part”, “lock pin”, “operation lever”, “attachment” of the present invention. It is a structural example corresponding to "spring”.
  • the power tool according to the present invention is not limited to the configuration of the illustrated concrete vibrator 1.
  • the changes exemplified below can be added. It should be noted that any one or more of these changes can be employed in combination with the concrete vibrator 1 shown in the embodiment or the invention described in the claims.
  • the electric tools to which the present invention can be applied include, in addition to the concrete vibrator 1, general tools for work and gardening that use electric power as power.
  • the present invention can be suitably applied to an electric tool used outdoors, an electric tool that performs processing using water, an electric tool that performs processing that generates dust, and the like.
  • Specific examples include a sander, a polisher, a grinder, a mower, a hedge trimmer, and a chain saw.
  • the configuration of the housing 10, the configuration of the motor 3, the arrangement position of the motor 3 in the housing 10, the arrangement position of the intake port 27, and the like can be changed as appropriate.
  • the first partition wall 14 that partitions the motor housing area 105 (second area) where the motor 3 is disposed and the intake area 106 (first area) communicating with the outside via the intake port 27. (Division part) should just be arrange
  • the first partition wall 14 having a labyrinth structure is cited as an example of the configuration corresponding to the partition portion of the present invention, but other configurations may be adopted.
  • a film having a property of blocking the liquid but having a high permeability to the cooling air, a sponge-like member, or the like may be employed.
  • any structure that forms a flow path that meanders in a maze shape may be used, and a structure different from the baffle wall 143 illustrated in the above embodiment (for example, crossing the flow path).
  • a plurality of baffle plates or the like arranged in the above may be employed.
  • the flow path may include a portion extending upward in the direction from the intake area 106 (first area) to the motor accommodating area 105 (second area) in a state where the electric tool is placed in a normal use posture. preferable. According to this configuration, it is more difficult for the liquid to pass from the intake area 106 (first area) to the motor accommodating area 105 (second area), and the intake area 106 ( The discharge of the liquid into the first region) can be made easier.
  • a plurality of types of labyrinth structures, films, sponges, and the like may be combined.
  • the labyrinth structure is formed by providing the baffle wall 273 similar to the first partition wall 14 around the air inlet 27. In this case, it is preferable because liquid and dust flowing into the intake region 106 can be suppressed, but it is not always necessary to provide a labyrinth structure around the intake port 27. In addition, when a labyrinth structure is provided, it is as above-mentioned about the point where it is preferable that the flow path contains the part extended upwards.
  • the isolation region 107 that is substantially hermetically isolated from the intake region 106 is not necessarily provided.
  • the inside of the rear housing 103 may be a single region that is not partitioned.
  • an electrical component such as the switch 210 may be coated to protect it from liquid and dust.
  • a part that is not substantially affected by liquid or dust may be disposed in this region.
  • the isolation region 107 is not necessarily disposed on the opposite side of the motor accommodation region 105 with the intake region 106 interposed therebetween, and the arrangement position, the shape thereof, and the electric components arranged inside can be changed as appropriate. .
  • the labyrinth structure is A wall that partitions the first region and the second region; A communication port formed in the wall portion for communicating the first region and the second region; A baffle wall provided adjacent to the plurality of communication ports and extending at least partially in a direction intersecting the opening direction of the communication ports may be included.
  • the housing may have a labyrinth structure provided around the intake port.
  • the partition portion is configured such that the cooling air entering direction from the first region to the second region intersects the cooling air entering direction from the outside to the first region.
  • a concrete vibrator configured to be detachable from a flexible shaft and a vibration rod provided with a flexible hose that rotatably holds the flexible shaft inside, A spindle configured to rotationally drive the flexible shaft; A hose coupling portion having a coupling hole extending coaxially with the rotation axis of the spindle; A lock pin held by the hose coupling part so as to be movable in a radial direction perpendicular to the rotation axis; The lock pin is rotatably connected to the lock pin, and the lock pin protrudes into the connection hole and can be engaged with the flexible hose, and is disposed on the radially outer side than the first position.
  • the operating lever configured to move between a second position incapable of being engaged with the flexible hose; And a biasing spring that biases the lock pin in a direction from the second position toward the first position.
  • the operating lever may be a lever lever.

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

Abstract

La présente invention concerne un outil électrique pourvu d'un logement (10), d'un moteur (3), d'une ouverture d'admission d'air (27) et d'une première paroi de séparation (14). Le moteur (3) est logé dans le logement (10). L'ouverture d'admission d'air (27) est disposée dans le logement (10) et est conçue de telle sorte que de l'air pour refroidir le moteur (3) peut s'écouler dans le logement (10) depuis l'extérieur de celui-ci. La première paroi de séparation (14) est disposée dans le trajet d'écoulement d'air de refroidissement, qui s'étend à l'intérieur du logement (10) à partir de l'ouverture d'admission d'air (27) jusqu'au moteur (3), et la première paroi de séparation (14) est conçue pour définir : une région d'admission d'air (106) entre des régions à l'intérieur du logement (10), la région d'admission d'air (106) étant en communication avec l'extérieur à travers l'ouverture d'admission d'air (27) ; et une région de réception de moteur (105) parmi les régions à l'intérieur du logement (10), le moteur (3) étant disposé à l'intérieur de la région de réception de moteur (105). La première paroi de séparation (14) est conçue de façon à permettre le passage de l'air de refroidissement depuis la région d'admission d'air (106) vers la région de réception de moteur (105) et à obstruer le passage de liquide ou de poussière.
PCT/JP2017/040310 2016-11-10 2017-11-08 Outil électrique WO2018088440A1 (fr)

Applications Claiming Priority (2)

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JP2016-220017 2016-11-10
JP2016220017A JP2018075685A (ja) 2016-11-10 2016-11-10 電動工具

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4306744A3 (fr) * 2022-07-11 2024-03-13 Milwaukee Electric Tool Corporation Vibreur pour béton
USD1046583S1 (en) 2022-07-11 2024-10-15 Milwaukee Electric Tool Corporation Concrete vibrator
US12129673B2 (en) 2022-08-16 2024-10-29 Milwaukee Electric Tool Corporation Concrete vibrator for use in a briefcase configuration

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020175006A1 (fr) * 2019-02-26 2020-09-03 工機ホールディングス株式会社 Engin de chantier électrique et procédé de formation d'un carter associé

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51144464U (fr) * 1975-05-15 1976-11-20
JPH09158483A (ja) * 1995-12-13 1997-06-17 Makita Corp コンクリートバイブレータ
JP2008302467A (ja) * 2007-06-07 2008-12-18 Makita Corp 電動工具
JP2010105130A (ja) * 2008-10-30 2010-05-13 Makita Corp 電動工具の通気窓
JP2013221339A (ja) * 2012-04-17 2013-10-28 San E Protent Co Ltd テント用ロック装置
JP2015127070A (ja) * 2013-12-27 2015-07-09 日立工機株式会社 電動作業機

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5454777B2 (ja) * 2009-11-12 2014-03-26 日立工機株式会社 電動工具

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51144464U (fr) * 1975-05-15 1976-11-20
JPH09158483A (ja) * 1995-12-13 1997-06-17 Makita Corp コンクリートバイブレータ
JP2008302467A (ja) * 2007-06-07 2008-12-18 Makita Corp 電動工具
JP2010105130A (ja) * 2008-10-30 2010-05-13 Makita Corp 電動工具の通気窓
JP2013221339A (ja) * 2012-04-17 2013-10-28 San E Protent Co Ltd テント用ロック装置
JP2015127070A (ja) * 2013-12-27 2015-07-09 日立工機株式会社 電動作業機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4306744A3 (fr) * 2022-07-11 2024-03-13 Milwaukee Electric Tool Corporation Vibreur pour béton
USD1046583S1 (en) 2022-07-11 2024-10-15 Milwaukee Electric Tool Corporation Concrete vibrator
US12129673B2 (en) 2022-08-16 2024-10-29 Milwaukee Electric Tool Corporation Concrete vibrator for use in a briefcase configuration

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