WO2013088805A1 - Reciprocating tool - Google Patents

Reciprocating tool Download PDF

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Publication number
WO2013088805A1
WO2013088805A1 PCT/JP2012/073802 JP2012073802W WO2013088805A1 WO 2013088805 A1 WO2013088805 A1 WO 2013088805A1 JP 2012073802 W JP2012073802 W JP 2012073802W WO 2013088805 A1 WO2013088805 A1 WO 2013088805A1
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WIPO (PCT)
Prior art keywords
reciprocating
motor
drive motor
reciprocating tool
output
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PCT/JP2012/073802
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French (fr)
Japanese (ja)
Inventor
太田　健一
光 砂辺
陽之介 青木
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株式会社マキタ
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Publication of WO2013088805A1 publication Critical patent/WO2013088805A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D51/00—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
    • B23D51/16—Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of drives or feed mechanisms for straight tools, e.g. saw blades, or bows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics

Definitions

  • the present invention relates to a reciprocating tool that converts a rotational output of a drive motor into a linear motion and outputs the linear motion.
  • the present invention relates to a reciprocating saw, a jigsaw, a hedge trimmer, a hammer, a hammer drill and the like.
  • the reciprocating saw described in Japanese Patent Application Laid-Open No. 2009-241242 has a drive motor, a motion conversion mechanism, and an output rod.
  • the drive motor is built in the main body.
  • the motion conversion mechanism converts the rotational output of the drive motor into a linear reciprocating motion and outputs it to the output rod.
  • a blade is attached to the output rod.
  • the reciprocating tool has a motion conversion mechanism that converts the rotational output of the drive motor into the reciprocating motion of the output rod.
  • the motion conversion mechanism includes a crank disk positioned coaxially with the rotation output of the drive motor and rotated by the drive motor, a crankshaft attached to the crank disk at a position eccentric to the crank disk, and rotation of the crankshaft A slider that obtains a reciprocating direction component of the output rod from the output rod and transmits it to the output rod.
  • the longitudinal length of the reciprocating tool can be shortened.
  • the length in the longitudinal direction of the reciprocating tool of the present invention can be shortened compared to a conventional reciprocating tool in which the motor axis and the motion conversion mechanism are arranged in the reciprocating direction (longitudinal direction) of the output rod.
  • FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 and is a cross-sectional view around the output rod.
  • FIG. 4 is a bottom view of the reciprocating tool viewed from the direction of arrow IV in FIG. 1.
  • the reciprocating tool 1 is a reciprocating cutting tool called a reciprocating saw.
  • the reciprocating tool 1 includes a main body portion 2 and a handle portion 3.
  • the main body 2 is equipped with an electric motor 10 as a drive motor.
  • the handle part 3 is provided at the rear part of the main body part 2.
  • a rechargeable battery pack 4 is attached to the lower portion of the handle portion 3.
  • the battery pack 4 is a lithium ion battery and can be used repeatedly by removing and charging.
  • the body 2 is provided with a motion conversion mechanism 20.
  • the motion conversion mechanism 20 converts the rotation output of the electric motor 10 around the motor axis J10 into reciprocating motion of the output rod 11 in the direction of the axis J11.
  • the electric motor 10 is an outer rotor motor, and includes a stator 13 and a cylindrical rotor (outer rotor) 17.
  • the electric motor 10 is attached to a main body base 12 made of aluminum alloy.
  • the main body base 12 is provided with a motor support portion 12a.
  • the motor support 12a is cylindrical and protrudes downward from the main body base 12.
  • the stator 13 is attached to the outer peripheral side of the motor support portion 12a.
  • the rotor 17 is rotatably supported by the output shaft 14 on the outer peripheral side of the stator 13.
  • the output shaft 14 of the electric motor 10 is supported so as to be rotatable around the motor axis J10 on the inner peripheral side of the motor support portion 12a.
  • the output shaft 14 is rotatably supported by a lower bearing (needle bearing) 15 and an upper bearing (ball bearing) 16.
  • a motor cooling fan 18 is attached to the lower surface of the output shaft 14 on the lower surface of the rotor 17.
  • the electric motor 10 is covered with a cylindrical motor cover 8.
  • the motor cover 8 is fixed to the lower surface of the main body base 12.
  • Two bearings (needle bearing 15 and ball bearing 16) that rotatably support the output shaft 14 of the electric motor 10 are attached to the main body base 12, but not attached to the motor cover 8.
  • the motor cover 8 has a cup shape and mainly functions as a lid that covers the periphery of the rotor 17.
  • a wind window 8 a for introducing outside air is provided on the bottom surface of the motor cover 8.
  • the fan 18 is rotated by the electric motor 10, and outside air is introduced into the motor cover 8 through the wind window 8 a.
  • the introduced outside air is also introduced into the rotor 17 through the ventilation holes 17 a provided in the rotor 17.
  • the introduced cooling air is exhausted from an exhaust hole 8 b provided on the rear surface of the motor cover 8.
  • the upper portion of the output shaft 14 protrudes from the upper portion of the motor support portion 12a.
  • a crank disk 21 is integrally provided on the output shaft 14.
  • a crankshaft 22 is provided at a position eccentric from the motor axis J10 by a certain distance on the upper surface of the crank disk 21.
  • the crankshaft 22 is a crank roller and has an outer ring that is rotatably supported via a needle roller.
  • the output shaft 14 is rotated around the motor axis J10 by the electric motor 10, and the crank disk 21 is rotated integrally with the output shaft 14.
  • the crankshaft 22 rotates (revolves) around the motor axis J10.
  • the output rod 11 is supported on the upper surface of the main body base 12 by the reciprocating support members 23 and 24 so as to reciprocate in the direction of the axis J11.
  • a slider 25 having a C-shaped cross section is integrally provided on the lower surface of the output rod 11 in the middle in the longitudinal direction.
  • the slider 25 extends long in a direction orthogonal to the motor axis J10 (paper thickness direction in FIG. 2).
  • the crankshaft 22 is inserted into the slider 25.
  • crankshaft 22 revolves around the motor axis J10 by the rotation of the crank disk 21.
  • the crankshaft 22 is engaged with a slider 25 provided on the output rod 11.
  • the crankshaft 22 revolves around the motor axis J10 while moving in the slider 25.
  • Only the component in the direction of the axis J ⁇ b> 11 of the revolution movement of the crankshaft 22 is transmitted to the output rod 11.
  • the crank disk 21, the crankshaft 22, the slider 25, and the like constitute a motion conversion mechanism (crank mechanism) 20.
  • the motion conversion mechanism 20 converts the rotational output of the electric motor 10 into reciprocating motion of the output rod 11 in the direction of the axis J11.
  • the reciprocating support members 23 and 24 are made of a material (bearing metal) having high slidability and wear resistance, and have a rectangular block shape.
  • the reciprocating support members 23 and 24 are attached to the upper surface of the main body base 12 at an appropriate interval in the direction of the axis J11.
  • the lower half of the reciprocating support members 23, 24 is inserted into the positioning recess 12c provided with high accuracy on the upper surface of the main body base 12 and fixed without rattling.
  • the support holes 23a and 24a of the reciprocating support members 23 and 24 are coaxially arranged on the axis J11 with high accuracy.
  • the reciprocating support members 23 and 24 are fixed on the main body base 12 by a fixing bracket 26.
  • the fixing bracket 26 is formed in a rectangular shape by bending both side portions of the band steel plate.
  • the reciprocating support members 23 and 24 are pressed by the fixing bracket 26 and fixed in the positioning recess 12c.
  • the fixing bracket 26 is fixed to the upper surface of the main body base 12 by fixing bolts 27.
  • a long escape window 26a is provided on the upper surface of the fixed bracket 26 in the front-rear direction (in the direction of the axis J11) (see FIG. 2).
  • the reciprocating support members 23 and 24 and the fixed bracket 26 are covered with the main body cover 9 from above.
  • the main body cover 9 is attached to the main body base 12 so as to cover the upper surface of the main body base 12.
  • a nose portion 12b having a substantially rectangular opening is provided at the front portion of the main body base 12.
  • the front portion of the output rod 11 projects forward from the nose portion 12b.
  • a chuck device 5 is provided at the tip of the output rod 11.
  • the cutting tool 7 is attached to the output rod 11 by the chuck device 5.
  • the reciprocating tool 1 has an outer rotor motor that can output low-speed rotation and high torque as the electric motor 10. For this reason, the rotation output of the electric motor 10 can be directly output to the motion conversion mechanism 20 without a conventional gear reduction mechanism or the like. That is, the reciprocating tool 1 has a direct drive type motion conversion mechanism 20.
  • a crank disk 21 is integrally provided on the output shaft 14 of the electric motor 10. The crank disk 21 and the motor axis J10 are coaxially positioned.
  • the length of the reciprocating tool 1 in the longitudinal direction is greatly increased compared to the conventional structure, that is, a structure having a speed reduction means such as a gear between the electric motor 10 and the motion conversion mechanism 20. Can be shortened.
  • speed reduction means such as gears can be omitted. Therefore, the operation sound of the reciprocating tool 1 can be reduced. Alternatively, the durability of the reciprocating tool 1 can be improved. Or power transmission efficiency can be improved.
  • the output shaft 14 of the electric motor 10 is rotatably supported by two bearings (needle bearing 15 and ball bearing 16) attached to the main body base 12. For this reason, there is no influence of the assembly error which arises when two bearings are attached to a separate member. Thereby, the center position of the output shaft 14 can be set with high accuracy.
  • the motor cover 8 is not attached with a bearing that supports the output shaft 14 of the electric motor 10. Therefore, the motor cover 8 has only a function of covering the electric motor 10 and can be configured simply.
  • the electric motor 10 and the output rod 11 are supported on one main body base 12. That is, members constituting a power transmission path from the electric motor 10 to the output rod 11 are assembled to one main body base 12. Therefore, it is possible to eliminate the influence of assembly errors in the power transmission path. Thereby, components such as the reciprocating support members 23 and 24 can be easily simplified.
  • the reciprocating tool 1 has an outer rotor motor as the electric motor 10.
  • the rotor 17 (outer rotor) obtains a larger inertia force than the inner rotor. Therefore, the output rod 11 can smoothly reciprocate using the large inertial force of the rotor 17. That is, the output rod 11 reciprocates smoothly due to the flywheel effect of the rotor 17.
  • the electric motor 10 may be an outer rotor motor or an inner rotor motor.
  • the inner rotor motor may be arranged coaxially with the crank disk 21, and a planetary gear train, a reduction gear train, or the like may be provided in the motor support portion 12a.
  • the longitudinal length of the reciprocating tool 1 can be shortened by arranging the electric motor and the crank disk 21 of the motion conversion mechanism coaxially.
  • the bearing (needle bearing) 15 may be attached to the main body base 12 as shown in FIG. 2 or may be attached to the motor cover 8. That is, one end of the output shaft of the electric motor may be supported by the main body base, and the other end may be supported by the motor cover.
  • the output rod 11 may be mounted on the main body base 12 as shown in FIG. 2 or may be mounted on a member different from the main body base 12.
  • the reciprocating tool 1 may be a battery type reciprocating saw shown in FIG. 1 or an AC power source type reciprocating saw.
  • the reciprocating tool 1 may be a reciprocating saw, a jigsaw, a hedge trimmer, a hammer, a hammer drill, or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

A reciprocating tool (1) has a motion converting mechanism (20) for converting the rotational output of a drive motor (10) to the reciprocating motion of an output rod (11). The motion converting mechanism (20) is provided with a crank disk (21) which is located coaxially with the rotational output of the drive motor (10) and which is rotated by the drive motor (10), a crankshaft (22) which is mounted to the crank disk (21) at a position eccentric thereto, and a slider (25) which obtains, from the rotation of the crankshaft (22), a component in the reciprocating direction of the output rod (11) and which transfers the component to the output rod (11).

Description

往復動工具Reciprocating tool
　本発明は、駆動モータの回転出力を直線運動に変換して出力する往復動工具に関する。例えば本発明は、レシプロソー、ジグソー、ヘッジトリマ、ハンマ、ハンマドリル等に関する。 The present invention relates to a reciprocating tool that converts a rotational output of a drive motor into a linear motion and outputs the linear motion. For example, the present invention relates to a reciprocating saw, a jigsaw, a hedge trimmer, a hammer, a hammer drill and the like.
　特開２００９－２４１２４２号公報に記載のレシプロソーは、駆動モータと運動変換機構と出力ロッドを有する。駆動モータは、本体部に内装される。運動変換機構は、駆動モータの回転出力を直線往復動に変換して出力ロッドに出力する。出力ロッドには、ブレードが装着される。駆動モータと運動変換機構の間には、駆動モータの回転出力を複数のギヤによって減速して運動変換機構に伝える機構が設けられる。 The reciprocating saw described in Japanese Patent Application Laid-Open No. 2009-241242 has a drive motor, a motion conversion mechanism, and an output rod. The drive motor is built in the main body. The motion conversion mechanism converts the rotational output of the drive motor into a linear reciprocating motion and outputs it to the output rod. A blade is attached to the output rod. Between the drive motor and the motion conversion mechanism, there is provided a mechanism for decelerating the rotation output of the drive motor with a plurality of gears and transmitting it to the motion conversion mechanism.
　従来、レシプロソーの長手方向長さを短くする種々な工夫がなされている。しかしレシプロソーの長さを十分に短くすることができなかった。モータ軸線が出力ロッドの往復動方向（長手方向）に平行する構成を備えるレシプロソーは、当然にその長さを十分に短くすることが難しい（横置き）。上記の特許文献に記載のレシプロソーでは、モータ軸線が出力ロッドの往復動方向に対して直交する（縦置き）。しかし駆動モータと運動変換機構は、その間に複数のギヤが設けられるために長手方向に並ぶ。そのため縦置きのレシプロソーにおいても長手方向長さを短くすることが難しい。 Conventionally, various contrivances have been made to shorten the length of the reciprocating saw in the longitudinal direction. However, the length of the reciprocating saw could not be shortened sufficiently. In a reciprocating saw having a configuration in which the motor axis is parallel to the reciprocating direction (longitudinal direction) of the output rod, it is naturally difficult to sufficiently shorten the length (sideways). In the reciprocating saw described in the above-mentioned patent document, the motor axis is orthogonal to the reciprocating direction of the output rod (vertical placement). However, the drive motor and the motion conversion mechanism are arranged in the longitudinal direction because a plurality of gears are provided therebetween. For this reason, it is difficult to shorten the length in the longitudinal direction even in a vertically installed reciprocating saw.
　したがって従来、レシプロソー等の往復動工具において長手方向長さを短くし得る構成が必要とされている。 Therefore, conventionally, there is a need for a reciprocating tool such as a reciprocating saw that can shorten the length in the longitudinal direction.
　本発明の１つの特徴によると、往復動工具は、駆動モータの回転出力を出力ロッドの往復動に変換する運動変換機構を有する。運動変換機構は、駆動モータの回転出力と同軸に位置しかつ駆動モータによって回転するクランク円板と、クランク円板に対して偏心した位置でクランク円板に取付けられるクランク軸と、クランク軸の回転から出力ロッドの往復動方向成分を得て出力ロッドに伝達するスライダを備える。 According to one feature of the present invention, the reciprocating tool has a motion conversion mechanism that converts the rotational output of the drive motor into the reciprocating motion of the output rod. The motion conversion mechanism includes a crank disk positioned coaxially with the rotation output of the drive motor and rotated by the drive motor, a crankshaft attached to the crank disk at a position eccentric to the crank disk, and rotation of the crankshaft A slider that obtains a reciprocating direction component of the output rod from the output rod and transmits it to the output rod.
　したがって駆動モータとクランク円板が同軸に配置されているため、往復動工具の長手方向長さを短くできる。例えばモータ軸線と運動変換機構が出力ロッドの往復動方向（長手方向）に並ぶ従来の往復動工具に比べて本発明の往復動工具の長手方向長さを短くできる。 Therefore, since the drive motor and the crank disk are arranged coaxially, the longitudinal length of the reciprocating tool can be shortened. For example, the length in the longitudinal direction of the reciprocating tool of the present invention can be shortened compared to a conventional reciprocating tool in which the motor axis and the motion conversion mechanism are arranged in the reciprocating direction (longitudinal direction) of the output rod.
本実施形態に係る往復動工具の側面図、および本体部の縦断面である。It is the side view of the reciprocating tool which concerns on this embodiment, and the longitudinal cross-section of a main-body part. 往復動工具の本体部の縦断面図である。It is a longitudinal cross-sectional view of the main-body part of a reciprocating tool. 図２のIII―III線断面矢視図であって出力ロッド周辺の横断面図である。FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 and is a cross-sectional view around the output rod. 図１の矢印IV方向から見た往復動工具の下面図である。FIG. 4 is a bottom view of the reciprocating tool viewed from the direction of arrow IV in FIG. 1.
　本発明の１つの実施の形態を図１～４にしたがって説明する。図１に示すように往復動工具１は、レシプロソーと称される往復動切断工具である。往復動工具１は、本体部２とハンドル部３を備える。本体部２には、駆動モータとしての電動モータ１０が内装される。ハンドル部３は、本体部２の後部に設けられる。ハンドル部３の下部に充電式のバッテリパック４が装着される。バッテリパック４は、リチウムイオンバッテリで、取り外して充電することにより繰り返し使用できる。 One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the reciprocating tool 1 is a reciprocating cutting tool called a reciprocating saw. The reciprocating tool 1 includes a main body portion 2 and a handle portion 3. The main body 2 is equipped with an electric motor 10 as a drive motor. The handle part 3 is provided at the rear part of the main body part 2. A rechargeable battery pack 4 is attached to the lower portion of the handle portion 3. The battery pack 4 is a lithium ion battery and can be used repeatedly by removing and charging.
　図２に示すように本体部２に運動変換機構２０が内装される。運動変換機構２０は、電動モータ１０のモータ軸線Ｊ１０回りの回転出力を出力ロッド１１の軸線Ｊ１１方向の往復動に変換する。電動モータ１０は、アウタロータモータであって、固定子１３と円筒形の回転子（アウタロータ）１７を有する。電動モータ１０は、アルミニウム合金製の本体ベース１２に取付けられる。本体ベース１２にはモータ支持部１２ａが設けられる。モータ支持部１２ａは、円筒形状で本体ベース１２から下方へ突出する。固定子１３がモータ支持部１２ａの外周側に取付けられる。回転子１７は、固定子１３の外周側に出力軸１４によって回転可能に支持される。 As shown in FIG. 2, the body 2 is provided with a motion conversion mechanism 20. The motion conversion mechanism 20 converts the rotation output of the electric motor 10 around the motor axis J10 into reciprocating motion of the output rod 11 in the direction of the axis J11. The electric motor 10 is an outer rotor motor, and includes a stator 13 and a cylindrical rotor (outer rotor) 17. The electric motor 10 is attached to a main body base 12 made of aluminum alloy. The main body base 12 is provided with a motor support portion 12a. The motor support 12a is cylindrical and protrudes downward from the main body base 12. The stator 13 is attached to the outer peripheral side of the motor support portion 12a. The rotor 17 is rotatably supported by the output shaft 14 on the outer peripheral side of the stator 13.
　図２に示すように電動モータ１０の出力軸１４は、モータ支持部１２ａの内周側にてモータ軸線Ｊ１０回りに回転可能に支持される。出力軸１４は、下軸受け（ニードルベアリング）１５と上軸受け（ボールベアリング）１６によって回転可能に支持される。出力軸１４の下部には、回転子１７の下面においてモータ冷却用のファン１８が取付けられる。 As shown in FIG. 2, the output shaft 14 of the electric motor 10 is supported so as to be rotatable around the motor axis J10 on the inner peripheral side of the motor support portion 12a. The output shaft 14 is rotatably supported by a lower bearing (needle bearing) 15 and an upper bearing (ball bearing) 16. A motor cooling fan 18 is attached to the lower surface of the output shaft 14 on the lower surface of the rotor 17.
　図２に示すように電動モータ１０は、円筒形のモータカバー８で覆われる。モータカバー８は、本体ベース１２の下面に固定される。電動モータ１０の出力軸１４を回転支持する２つの軸受け（ニードルベアリング１５、ボールベアリング１６）は、それぞれ本体ベース１２に取付けられ、モータカバー８には取付けられない。モータカバー８は、カップ形を有し、主として回転子１７の周囲を覆う蓋として機能を有する。図４に示すようにモータカバー８の底面には、外気を導入するための風窓８ａが設けられる。電動モータ１０によってファン１８が回転し、風窓８ａを経て外気がモータカバー８に導入される。導入された外気は、回転子１７に設けた通風孔１７ａを経て回転子１７にも導入される。これにより固定子１３が冷却される。導入された冷却風は、モータカバー８の後面に設けた排気孔８ｂから排気される。 As shown in FIG. 2, the electric motor 10 is covered with a cylindrical motor cover 8. The motor cover 8 is fixed to the lower surface of the main body base 12. Two bearings (needle bearing 15 and ball bearing 16) that rotatably support the output shaft 14 of the electric motor 10 are attached to the main body base 12, but not attached to the motor cover 8. The motor cover 8 has a cup shape and mainly functions as a lid that covers the periphery of the rotor 17. As shown in FIG. 4, a wind window 8 a for introducing outside air is provided on the bottom surface of the motor cover 8. The fan 18 is rotated by the electric motor 10, and outside air is introduced into the motor cover 8 through the wind window 8 a. The introduced outside air is also introduced into the rotor 17 through the ventilation holes 17 a provided in the rotor 17. Thereby, the stator 13 is cooled. The introduced cooling air is exhausted from an exhaust hole 8 b provided on the rear surface of the motor cover 8.
　図２に示すように出力軸１４の上部は、モータ支持部１２ａの上部から突出する。出力軸１４の上部にクランク円板２１が一体に設けられる。クランク円板２１の上面においてモータ軸線Ｊ１０と一定距離だけ偏心した位置にクランク軸２２が設けられる。クランク軸２２は、クランクローラであって、ニードルローラを介して回転自在に支持される外輪を有する。電動モータ１０によって出力軸１４がモータ軸線Ｊ１０回りに回転し、出力軸１４と一体でクランク円板２１が回転する。これによりクランク軸２２がモータ軸線Ｊ１０回りを回転（公転）する。 As shown in FIG. 2, the upper portion of the output shaft 14 protrudes from the upper portion of the motor support portion 12a. A crank disk 21 is integrally provided on the output shaft 14. A crankshaft 22 is provided at a position eccentric from the motor axis J10 by a certain distance on the upper surface of the crank disk 21. The crankshaft 22 is a crank roller and has an outer ring that is rotatably supported via a needle roller. The output shaft 14 is rotated around the motor axis J10 by the electric motor 10, and the crank disk 21 is rotated integrally with the output shaft 14. As a result, the crankshaft 22 rotates (revolves) around the motor axis J10.
　図２に示すように出力ロッド１１は、往復動支持部材２３，２４によって軸線Ｊ１１方向に往復動可能に本体ベース１２の上面に支持される。出力ロッド１１の長手方向中程の下面に断面Ｃ字形を有するスライダ２５が一体に設けられる。スライダ２５は、モータ軸線Ｊ１０に対して直交する方向（図２の紙厚み方向）に長く伸びる。スライダ２５にクランク軸２２が挿入される。 As shown in FIG. 2, the output rod 11 is supported on the upper surface of the main body base 12 by the reciprocating support members 23 and 24 so as to reciprocate in the direction of the axis J11. A slider 25 having a C-shaped cross section is integrally provided on the lower surface of the output rod 11 in the middle in the longitudinal direction. The slider 25 extends long in a direction orthogonal to the motor axis J10 (paper thickness direction in FIG. 2). The crankshaft 22 is inserted into the slider 25.
　図２に示すようにクランク円板２１の回転によってクランク軸２２がモータ軸線Ｊ１０回りを公転する。クランク軸２２は、出力ロッド１１に設けたスライダ２５に係合する。クランク軸２２は、スライダ２５内を移動しつつモータ軸線Ｊ１０回りに公転する。これによりクランク軸２２の公転移動のうちの軸線Ｊ１１方向の成分のみが出力ロッド１１に伝達される。クランク円板２１、クランク軸２２及びスライダ２５等によって運動変換機構（クランク機構）２０が構成される。運動変換機構２０によって電動モータ１０の回転出力が出力ロッド１１の軸線Ｊ１１方向の往復動に変換される。 2, the crankshaft 22 revolves around the motor axis J10 by the rotation of the crank disk 21. The crankshaft 22 is engaged with a slider 25 provided on the output rod 11. The crankshaft 22 revolves around the motor axis J10 while moving in the slider 25. As a result, only the component in the direction of the axis J <b> 11 of the revolution movement of the crankshaft 22 is transmitted to the output rod 11. The crank disk 21, the crankshaft 22, the slider 25, and the like constitute a motion conversion mechanism (crank mechanism) 20. The motion conversion mechanism 20 converts the rotational output of the electric motor 10 into reciprocating motion of the output rod 11 in the direction of the axis J11.
　図３に示すように往復動支持部材２３，２４は、高い摺動性と耐摩耗性を有する素材（軸受けメタル）で形成され、矩形のブロック体形状を有する。往復動支持部材２３，２４は、軸線Ｊ１１方向に適度な間隔をおいて本体ベース１２の上面に取付けられる。往復動支持部材２３，２４の下側略半分は、本体ベース１２の上面に高精度で設けた位置決め凹部１２ｃに挿入されてガタツキなく固定される。これにより往復動支持部材２３，２４の支持孔２３ａ，２４ａは、相互に高精度で同軸かつ軸線Ｊ１１上に配置される。 As shown in FIG. 3, the reciprocating support members 23 and 24 are made of a material (bearing metal) having high slidability and wear resistance, and have a rectangular block shape. The reciprocating support members 23 and 24 are attached to the upper surface of the main body base 12 at an appropriate interval in the direction of the axis J11. The lower half of the reciprocating support members 23, 24 is inserted into the positioning recess 12c provided with high accuracy on the upper surface of the main body base 12 and fixed without rattling. As a result, the support holes 23a and 24a of the reciprocating support members 23 and 24 are coaxially arranged on the axis J11 with high accuracy.
　図３に示すように往復動支持部材２３，２４は、固定ブラケット２６によって本体ベース１２上に固定される。固定ブラケット２６は、帯鋼板の両側部を折り曲げることで矩形状に成形される。往復動支持部材２３，２４は、固定ブラケット２６によって押え付けられて位置決め凹部１２ｃ内に固定される。固定ブラケット２６は、固定ボルト２７に本体ベース１２の上面に固定される。固定ブラケット２６の上面には、前後方向（軸線Ｊ１１方向）に長い逃がし窓２６ａが設けられる（図２参照）。 As shown in FIG. 3, the reciprocating support members 23 and 24 are fixed on the main body base 12 by a fixing bracket 26. The fixing bracket 26 is formed in a rectangular shape by bending both side portions of the band steel plate. The reciprocating support members 23 and 24 are pressed by the fixing bracket 26 and fixed in the positioning recess 12c. The fixing bracket 26 is fixed to the upper surface of the main body base 12 by fixing bolts 27. A long escape window 26a is provided on the upper surface of the fixed bracket 26 in the front-rear direction (in the direction of the axis J11) (see FIG. 2).
　図２に示すように往復動支持部材２３，２４及び固定ブラケット２６は、上方から本体カバー９で覆われる。本体カバー９は、本体ベース１２の上面を覆うように本体ベース１２に取付けられる。 As shown in FIG. 2, the reciprocating support members 23 and 24 and the fixed bracket 26 are covered with the main body cover 9 from above. The main body cover 9 is attached to the main body base 12 so as to cover the upper surface of the main body base 12.
　図１，４に示すように本体ベース１２の前部には、概ね矩形状の開口を有するノーズ部１２ｂが設けられる。出力ロッド１１の前部がノーズ部１２ｂから前方へ突出する。出力ロッド１１の先端にチャック装置５が設けられる。チャック装置５によって出力ロッド１１に刃具７が取付けられる。ノーズ部１２ｂの下面には、切断材に当接されるシュー６が装着される。 1 and 4, a nose portion 12b having a substantially rectangular opening is provided at the front portion of the main body base 12. The front portion of the output rod 11 projects forward from the nose portion 12b. A chuck device 5 is provided at the tip of the output rod 11. The cutting tool 7 is attached to the output rod 11 by the chuck device 5. On the lower surface of the nose portion 12b, a shoe 6 that is in contact with the cutting material is mounted.
　以上のように往復動工具１は、電動モータ１０として低速回転高トルクを出力できるアウタロータモータを有する。このため電動モータ１０の回転出力が従来のギヤ減速機構等なく、直接運動変換機構２０に出力され得る。すなわち往復動工具１は、ダイレクトドライブ式の運動変換機構２０を有する。ダイレクトドライブ式の運動変換機構２０では、電動モータ１０の出力軸１４にクランク円板２１が一体に設けられる。クランク円板２１とモータ軸線Ｊ１０が同軸上に位置する。このため従来の構造、すなわち電動モータ１０と運動変換機構２０の間にギヤ等の減速手段を有する構造に比べて、往復動工具１の長手方向（前後方向、軸線Ｊ１１方向）長さを大幅に短くし得る。 As described above, the reciprocating tool 1 has an outer rotor motor that can output low-speed rotation and high torque as the electric motor 10. For this reason, the rotation output of the electric motor 10 can be directly output to the motion conversion mechanism 20 without a conventional gear reduction mechanism or the like. That is, the reciprocating tool 1 has a direct drive type motion conversion mechanism 20. In the direct drive type motion conversion mechanism 20, a crank disk 21 is integrally provided on the output shaft 14 of the electric motor 10. The crank disk 21 and the motor axis J10 are coaxially positioned. For this reason, the length of the reciprocating tool 1 in the longitudinal direction (front-rear direction, axis J11 direction) is greatly increased compared to the conventional structure, that is, a structure having a speed reduction means such as a gear between the electric motor 10 and the motion conversion mechanism 20. Can be shortened.
　往復動工具１では、ギヤ等の減速手段を省略できる。そのため往復動工具１の動作音を小さくできる。あるいは往復動工具１の耐久性を向上させ得る。あるいは動力伝達効率を向上させ得る。 In the reciprocating tool 1, speed reduction means such as gears can be omitted. Therefore, the operation sound of the reciprocating tool 1 can be reduced. Alternatively, the durability of the reciprocating tool 1 can be improved. Or power transmission efficiency can be improved.
　図２に示すように電動モータ１０の出力軸１４は、本体ベース１２に取付けられた２つの軸受け（ニードルベアリング１５とボールベアリング１６）によって回転可能に支持される。このため２つの軸受けが別々の部材に取付けられることで生じる組付け誤差の影響がない。これにより出力軸１４の中心位置が高精度で設定され得る。 As shown in FIG. 2, the output shaft 14 of the electric motor 10 is rotatably supported by two bearings (needle bearing 15 and ball bearing 16) attached to the main body base 12. For this reason, there is no influence of the assembly error which arises when two bearings are attached to a separate member. Thereby, the center position of the output shaft 14 can be set with high accuracy.
　図２に示すようにモータカバー８には、電動モータ１０の出力軸１４を支持する軸受けが取付けられていない。そのためモータカバー８は、電動モータ１０を覆う機能のみを有し、簡易に構成され得る。 As shown in FIG. 2, the motor cover 8 is not attached with a bearing that supports the output shaft 14 of the electric motor 10. Therefore, the motor cover 8 has only a function of covering the electric motor 10 and can be configured simply.
　図２に示すように１つの本体ベース１２に、電動モータ１０と出力ロッド１１が支持される。すなわち電動モータ１０から出力ロッド１１に至る動力伝達経路を構成する部材が１つの本体ベース１２に組み付けられる。そのため動力伝達経路において組み付け誤差の影響を排除できる。これにより往復動支持部材２３，２４等の部品を容易に簡略し得る。 As shown in FIG. 2, the electric motor 10 and the output rod 11 are supported on one main body base 12. That is, members constituting a power transmission path from the electric motor 10 to the output rod 11 are assembled to one main body base 12. Therefore, it is possible to eliminate the influence of assembly errors in the power transmission path. Thereby, components such as the reciprocating support members 23 and 24 can be easily simplified.
　図２に示すように往復動工具１は、電動モータ１０としてアウタロータモータを有する。回転子１７（アウタロータ）は、インナロータに比べて大きな慣性力を得る。そのため回転子１７の大きな慣性力を利用して、出力ロッド１１が滑らかに往復動できる。すなわち回転子１７のフライホイール効果によって出力ロッド１１が滑らかに往復動する。 As shown in FIG. 2, the reciprocating tool 1 has an outer rotor motor as the electric motor 10. The rotor 17 (outer rotor) obtains a larger inertia force than the inner rotor. Therefore, the output rod 11 can smoothly reciprocate using the large inertial force of the rotor 17. That is, the output rod 11 reciprocates smoothly due to the flywheel effect of the rotor 17.
　本発明の形態を上記構造を参照して説明したが、本発明の目的を逸脱せずに多くの交代、改良、変更が可能であることは当業者であれば明らかである。したがって本発明の形態は、添付された請求項の精神と目的を逸脱しない全ての交代、改良、変更を含み得る。例えば本発明の形態は、前記特別な構造に限定されず、下記のように変更が可能である。 Although the embodiments of the present invention have been described with reference to the above structure, it will be apparent to those skilled in the art that many substitutions, improvements, and changes can be made without departing from the object of the present invention. Accordingly, aspects of the invention may include all alterations, modifications, and changes that do not depart from the spirit and scope of the appended claims. For example, the form of the present invention is not limited to the special structure, and can be modified as follows.
　電動モータ１０は、アウタロータモータでも良いし、インナロータモータでも良い。電動モータ１０がインナロータモータの場合、インナロータモータがクランク円板２１と同軸に配され、モータ支持部１２ａに遊星歯車列、減速ギヤ列等が内装されても良い。電動モータと運動変換機構のクランク円板２１を同軸に配置することにより往復動工具１の長手方向長さを短くできる。 The electric motor 10 may be an outer rotor motor or an inner rotor motor. When the electric motor 10 is an inner rotor motor, the inner rotor motor may be arranged coaxially with the crank disk 21, and a planetary gear train, a reduction gear train, or the like may be provided in the motor support portion 12a. The longitudinal length of the reciprocating tool 1 can be shortened by arranging the electric motor and the crank disk 21 of the motion conversion mechanism coaxially.
　軸受け（ニードルベアリング）１５は、図２に示すように本体ベース１２に取付けられても良いし、モータカバー８に取付けられても良い。すなわち電動モータの出力軸の一端が本体ベースに支持され、他端がモータカバーに支持されても良い。 The bearing (needle bearing) 15 may be attached to the main body base 12 as shown in FIG. 2 or may be attached to the motor cover 8. That is, one end of the output shaft of the electric motor may be supported by the main body base, and the other end may be supported by the motor cover.
　出力ロッド１１は、図２に示すように本体ベース１２上に取付けられても良いし、本体ベース１２と異なる部材に取付けられても良い。 The output rod 11 may be mounted on the main body base 12 as shown in FIG. 2 or may be mounted on a member different from the main body base 12.
　往復動工具１は、図１に示すバッテリ式のレシプロソーでも良いし、交流電源式のレシプロソーでも良い。往復動工具１は、レシプロソーでも良いし、ジグソー、ヘッジトリマ、ハンマ、ハンマドリル等でも良い。 The reciprocating tool 1 may be a battery type reciprocating saw shown in FIG. 1 or an AC power source type reciprocating saw. The reciprocating tool 1 may be a reciprocating saw, a jigsaw, a hedge trimmer, a hammer, a hammer drill, or the like.

Claims (4)

  1. 　往復動工具であって、
    　駆動モータの回転出力を出力ロッドの往復動に変換する運動変換機構を有し、
    　前記運動変換機構は、前記駆動モータの回転出力と同軸に位置しかつ前記駆動モータによって回転するクランク円板と、前記クランク円板に対して偏心した位置で前記クランク円板に取付けられるクランク軸と、前記クランク軸の回転から前記出力ロッドの往復動方向成分を得て前記出力ロッドに伝達するスライダを備える往復動工具。     A reciprocating tool,
    It has a motion conversion mechanism that converts the rotational output of the drive motor into the reciprocating motion of the output rod,
    The motion conversion mechanism includes a crank disk that is positioned coaxially with the rotational output of the drive motor and rotated by the drive motor, and a crankshaft that is attached to the crank disk at a position that is eccentric with respect to the crank disk. A reciprocating tool comprising a slider that obtains a reciprocating direction component of the output rod from the rotation of the crankshaft and transmits it to the output rod.
  2. 　請求項１に記載の往復動工具であって、
    　前記駆動モータがアウタロータモータである往復動工具。     The reciprocating tool according to claim 1,
    A reciprocating tool in which the drive motor is an outer rotor motor.
  3. 　請求項１または２に記載の往復動工具であって、
    　前記駆動モータは、１つの部材に取付けた２つの軸受けによって回転支持される出力軸を有する往復動工具。     The reciprocating tool according to claim 1 or 2,
    The drive motor is a reciprocating tool having an output shaft rotatably supported by two bearings attached to one member.
  4. 　請求項１～３のいずれか１つに記載の往復動工具であって、
    　さらに前記駆動モータが取付けられる本体ベースを有し、前記本体ベースに前記往復動可能に前記出力ロッドが支持される往復動工具。     Reciprocating tool according to any one of claims 1 to 3,
    A reciprocating tool further comprising a main body base to which the drive motor is attached, and wherein the output rod is supported by the main body base so as to be capable of reciprocating.
PCT/JP2012/073802 2011-12-13 2012-09-18 Reciprocating tool WO2013088805A1 (en)

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JP2018134721A (en) * 2017-02-23 2018-08-30 株式会社マキタ Reciprocation saw
EP4072769A4 (en) * 2019-12-10 2023-12-27 Milwaukee Electric Tool Corporation Reciprocating saw

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* Cited by examiner, † Cited by third party
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JP6266304B2 (en) * 2013-10-30 2018-01-24 株式会社マキタ Reciprocating cutting tool

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JP2003501291A (en) * 1999-06-05 2003-01-14 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Hand held thread sawing machine
JP2004050224A (en) * 2002-07-19 2004-02-19 Asahi-Seiki Mfg Co Ltd Eccentricity changing mechanism for crankshaft and driving device of cross working tool
JP2007098562A (en) * 2005-09-07 2007-04-19 Yokota Kogyo Kk Electric impact tightening tool
JP2011218501A (en) * 2010-04-12 2011-11-04 Makita Corp Reciprocating cutting tool

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JP2003501291A (en) * 1999-06-05 2003-01-14 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Hand held thread sawing machine
JP2004050224A (en) * 2002-07-19 2004-02-19 Asahi-Seiki Mfg Co Ltd Eccentricity changing mechanism for crankshaft and driving device of cross working tool
JP2007098562A (en) * 2005-09-07 2007-04-19 Yokota Kogyo Kk Electric impact tightening tool
JP2011218501A (en) * 2010-04-12 2011-11-04 Makita Corp Reciprocating cutting tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018134721A (en) * 2017-02-23 2018-08-30 株式会社マキタ Reciprocation saw
JP7000028B2 (en) 2017-02-23 2022-01-19 株式会社マキタ Reciprocating saw
EP4072769A4 (en) * 2019-12-10 2023-12-27 Milwaukee Electric Tool Corporation Reciprocating saw

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