JP2006000972A - Impact tool - Google Patents

Impact tool Download PDF

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Publication number
JP2006000972A
JP2006000972A JP2004179919A JP2004179919A JP2006000972A JP 2006000972 A JP2006000972 A JP 2006000972A JP 2004179919 A JP2004179919 A JP 2004179919A JP 2004179919 A JP2004179919 A JP 2004179919A JP 2006000972 A JP2006000972 A JP 2006000972A
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Prior art keywords
motor
magnet
impact
impact tool
magnetic
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JP2004179919A
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JP4407392B2 (en
Inventor
Hideki Shimizu
秀規 清水
Fumiaki Sawano
史明 沢野
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Priority to JP2004179919A priority Critical patent/JP4407392B2/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an impact tool which surely detects the rotational frequency without being affected by axial vibration of a rotary shaft of a motor, and also, is advantageous to miniaturization and weight reduction. <P>SOLUTION: The impact tool is provided with: the motor 3; an impact mechanism part 5 for generating the impact blow from the rotation of the motor 3; and a rotational frequency sensor 7 for detecting the rotational frequency of the motor. The rotational frequency sensor 7 is composed of a magnet 70, which is radially magnetized and mounted to the rotary shaft of the motor, and a magnetic induction element 71 arranged to the outer periphery of the magnet. The magnet 70 and the magnetic induction element 71 are prevented from interfering with each other even if the rotary shaft itself of the motor 3 is axially vibrated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、モータを動力源としているインパクト工具に関するものである。   The present invention relates to an impact tool using a motor as a power source.

モータを動力源としている電動工具において、モータの回転数を制御する場合、モータの回転数を検知する回転数センサーを設けることになるが、この回転数センサーとしては、モータの回転軸に放射状に着磁した磁石を設けるとともに、この磁石の外周に磁石の極数に応じた爪状の突起が並ぶ２枚のヨークとコイルとを配置した周波数ジェネレータと称されるものが用いられている。   In a power tool that uses a motor as a power source, when controlling the rotation speed of the motor, a rotation speed sensor that detects the rotation speed of the motor is provided, and as this rotation speed sensor, the rotation axis of the motor is arranged radially. A magnetized magnet is used, and a so-called frequency generator is used in which two yokes and coils are arranged on the outer periphery of the magnet with claw-shaped protrusions arranged in accordance with the number of magnet poles.

しかし、このような回転数センサーでは、モータの回転軸自体が軸方向振動をしてしまうインパクト工具においては、回転軸に取り付けられた磁石が上記ヨークと干渉して破損してしまうことがある。   However, in such a rotational speed sensor, in an impact tool in which the rotational shaft of the motor itself vibrates in the axial direction, the magnet attached to the rotational shaft may be damaged by interference with the yoke.

また、ヨークやコイル等のセンシング側の部材の部品点数が多くて小型軽量化化が困難である。
特開２００３−３４０６２０号公報 In addition, the number of parts of the sensing side members such as yokes and coils is large, and it is difficult to reduce the size and weight.
JP 2003-340620 A

本発明は上記の従来の問題点に鑑みて発明したものであって、モータの回転軸の軸方向振動の影響を受けることなく回転数検知を確実に行うことができる上に小型軽量化に有利なインパクト工具を提供することを課題とするものである。   The present invention has been invented in view of the above-described conventional problems, and is capable of reliably detecting the rotational speed without being affected by the axial vibration of the rotating shaft of the motor, and is advantageous in reducing the size and weight. It is an object to provide a simple impact tool.

上記課題を解決するために本発明に係るインパクト工具は、モータとこのモータの回転からインパクト打撃を発生するインパクト機構部とを備えているとともにモータ回転数の検出用の回転数センサーを備えているものにおいて、回転数センサーが放射状に着磁されてモータの回転軸に取り付けられた磁石と、該磁石の外周に配置された磁気感応素子とからなることに特徴を有している。モータの回転軸自体が軸方向に振動しても、磁石と磁気感応素子とが干渉するようなことがないものである。   In order to solve the above-described problems, an impact tool according to the present invention includes a motor and an impact mechanism that generates impact impact from the rotation of the motor, and also includes a rotation speed sensor for detecting the motor rotation speed. In the present invention, the rotational speed sensor is characterized by comprising a magnet magnetized radially and attached to the rotating shaft of the motor, and a magnetic sensitive element arranged on the outer periphery of the magnet. Even if the rotating shaft of the motor itself vibrates in the axial direction, the magnet and the magnetic sensitive element do not interfere with each other.

上記磁気感応素子はモータを収めたハウジングによってモータの回転軸の軸方向と交差する方向において挟持固定されていることが、磁気感応素子の位置ずれや振動による回転数検出精度の低下の防止の点で好ましい。   The magnetic sensitive element is sandwiched and fixed in a direction intersecting the axial direction of the motor rotation shaft by a housing that houses the motor, to prevent a decrease in rotational speed detection accuracy due to positional deviation or vibration of the magnetic sensitive element. Is preferable.

また、磁石とモータの磁気回路部との間にモータの回転軸を受ける磁性体製の軸受が位置していると、磁気回路部の磁気的影響を受けることなく回転数検出を行うことができる。   In addition, when a magnetic bearing that receives the rotation shaft of the motor is positioned between the magnet and the magnetic circuit portion of the motor, the rotational speed can be detected without being affected by the magnetic effect of the magnetic circuit portion. .

本発明は、モータの回転軸自体が軸方向に振動しても磁石と磁気感応素子とが干渉するようなことがなく、このために回転数検出に関して高い安定性を有するものであり、しかも周波数ジェネレータの場合に比して部品点数も少なくて小型軽量化に有利なものである。   The present invention does not cause interference between the magnet and the magnetically sensitive element even when the rotation shaft of the motor itself vibrates in the axial direction. For this reason, the present invention has high stability with respect to rotation speed detection and has a high frequency. Compared to the generator, the number of parts is small, which is advantageous for reducing the size and weight.

以下、本発明を添付図面に示す実施形態に基いて説明する。図示例のインパクト工具はグリップ部１０の下端に電池パック２を着脱自在に装着している本体１内に駆動源であるモータ３とその出力を減速する減速器４並びにインパクト機構部５を配したもので、グリップ部１０の根元部にはトリガーレバー１１を備えたスイッチ１２を内蔵している。図中６は出力軸、１３は設定状態の表示及び回転数設定値等の変更用の表示設定部、１４は制御回路部である。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. In the illustrated impact tool, a motor 3 as a drive source, a speed reducer 4 for decelerating its output, and an impact mechanism 5 are arranged in a main body 1 in which a battery pack 2 is detachably attached to the lower end of a grip 10. A switch 12 having a trigger lever 11 is built in the base of the grip portion 10. In the figure, 6 is an output shaft, 13 is a display setting section for displaying a setting state and changing a rotational speed setting value, and 14 is a control circuit section.

上記モータ３は本体１のハウジングをモータケースとするビルトインタイプのもので、その回転軸３１の一端側は上記減速器４に接続されているが、他端には図３に示すように放射状に着磁された磁石７０が取り付けられている。また該磁石７０の外周位置には本体１の二つ割とされているハウジングで挟持固定された磁気感応素子７１が配設されて、磁石７０と磁気感応素子７１とで回転数センサー７が構成されている。   The motor 3 is of a built-in type having the housing of the main body 1 as a motor case, and one end side of the rotating shaft 31 is connected to the speed reducer 4, but the other end is radially formed as shown in FIG. A magnetized magnet 70 is attached. Further, a magnetic sensitive element 71 sandwiched and fixed by a housing that is divided into two parts of the main body 1 is disposed at the outer peripheral position of the magnet 70, and the rotational speed sensor 7 is constituted by the magnet 70 and the magnetic sensitive element 71. Has been.

モータ３が回転する時の磁石７０の磁界の切り替わりが磁気感応素子７１から方形波として出力されるものであり、制御回路部１４は方形波信号の周期を計算することでモータ３の回転数を検出し、この検出結果に基づいてスイッチング素子１５をたとえばＰＷＭ制御駆動することでモータ３の回転数を制御してインパクトの打撃力を調整する。図３中の７２は磁気検出素子（図示例はホール素子）７１から導出されて前記制御回路部１４に接続されているリード線である。   The switching of the magnetic field of the magnet 70 when the motor 3 rotates is output as a square wave from the magnetic sensing element 71, and the control circuit unit 14 calculates the rotation speed of the motor 3 by calculating the period of the square wave signal. Based on the detection result, the rotational speed of the motor 3 is controlled by, for example, PWM control driving of the switching element 15 to adjust the impact striking force. Reference numeral 72 in FIG. 3 denotes a lead wire that is derived from a magnetic detection element 71 (in the illustrated example, a Hall element) and is connected to the control circuit unit 14.

磁気感応素子７１は磁石７０の外周に配置されており、モータ３の回転軸３１自体が軸方向に振動しても、磁石７０と磁気感応素子７１とが干渉するようなことはなく、また磁石７０の位置が軸方向に変化しても、回転数検出は放射状に着磁された磁石７０の回転による磁界の切り替わりを基に行っているために、回転数検出に支障が生じることはない。また、左右に二つ割の本体１のハウジングで磁気感応素子７１を回転軸３１と交差する方向において挟持しているために、磁気感応素子７１が振動の影響で左右方向に動いてしまうこともなく、このために高い回転数検出精度を得ることができる。   The magnetic sensitive element 71 is arranged on the outer periphery of the magnet 70, and even if the rotating shaft 31 itself of the motor 3 vibrates in the axial direction, the magnet 70 and the magnetic sensitive element 71 do not interfere with each other. Even if the position of 70 changes in the axial direction, the rotation speed detection is performed based on the switching of the magnetic field due to the rotation of the radially magnetized magnets 70, so that the rotation speed detection is not hindered. Further, since the magnetic sensitive element 71 is sandwiched in the direction intersecting the rotating shaft 31 by the housing of the main body 1 that is divided into two on the left and right, the magnetic sensitive element 71 may move in the horizontal direction due to the influence of vibration. For this reason, high rotational speed detection accuracy can be obtained.

ここで、磁石７０はモータ３の回転軸３１の端部に取り付けて、モータ３における磁気回路部と磁石７０との間に軸受３０が位置するようにしているのは、図６に示すように、磁気回路部の磁力線が磁性体からなる軸受３０を通過して回転数センサー７側に影響が及ばないようにしているためである。   Here, the magnet 70 is attached to the end of the rotating shaft 31 of the motor 3 so that the bearing 30 is positioned between the magnetic circuit portion and the magnet 70 in the motor 3, as shown in FIG. This is because the lines of magnetic force of the magnetic circuit section pass through the bearing 30 made of a magnetic material so as not to affect the rotation speed sensor 7 side.

なお、回転数センサー７はどのような目的で設けたものであってもよいのはもちろんである。たとえば回転数の変化によってインパクトの打撃を検出し、その打撃数を設定回数カウントして所定数に達すればモータへの電力を遮断することでインパクトの締め付け力制御を行うものでもよく、またモータ３の回転数表示のために設けただけのものであってもよい。   Of course, the rotational speed sensor 7 may be provided for any purpose. For example, the impact hitting may be detected based on a change in the rotation speed, and the impact tightening force control may be performed by cutting off the electric power to the motor if the hit count reaches a predetermined number and reaches a predetermined number. It may be provided only for displaying the number of rotations.

本発明の実施の形態の一例の縦断面図である。It is a longitudinal cross-sectional view of an example of embodiment of this invention. 同上の部分拡大縦断面図である。It is a partial expanded longitudinal cross-sectional view same as the above. 同上の横断面図である。It is a cross-sectional view same as the above. 同上の概略図である。It is a schematic diagram same as the above. 同上のブロック図である。It is a block diagram same as the above. 同上のモータの磁力線についての説明図である。It is explanatory drawing about the magnetic force line of a motor same as the above.

符号の説明Explanation of symbols

１ 本体
３ モータ
５ インパクト機構部
７ 回転数センサー
３１ 回転軸
７０ 磁石
７１ 磁気感応素子 DESCRIPTION OF SYMBOLS 1 Main body 3 Motor 5 Impact mechanism part 7 Rotational speed sensor 31 Rotating shaft 70 Magnet 71 Magnetic sensitive element

Claims (3)

モータとこのモータの回転からインパクト打撃を発生するインパクト機構部とを備えているとともにモータ回転数の検出用の回転数センサーを備えているインパクト工具において、上記回転数センサーは放射状に着磁されてモータの回転軸に取り付けられた磁石と、該磁石の外周に配置された磁気感応素子とからなることを特徴とするインパクト工具。   In an impact tool that includes a motor and an impact mechanism that generates impact impact from the rotation of the motor and includes a rotation speed sensor for detecting the rotation speed of the motor, the rotation speed sensor is radially magnetized. An impact tool comprising a magnet attached to a rotating shaft of a motor and a magnetic sensitive element arranged on the outer periphery of the magnet. 磁気感応素子はモータを収めたハウジングによってモータの回転軸の軸方向と交差する方向において挟持固定されていることを特徴とする請求項１記載のインパクト工具。   2. The impact tool according to claim 1, wherein the magnetically sensitive element is clamped and fixed in a direction intersecting the axial direction of the rotation shaft of the motor by a housing in which the motor is housed. 磁石とモータの磁気回路部との間にモータの回転軸を受ける磁性体製の軸受が位置していることを特徴とする請求項１または２記載のインパクト工具。   The impact tool according to claim 1 or 2, wherein a magnetic bearing for receiving a rotation shaft of the motor is located between the magnet and the magnetic circuit portion of the motor.
JP2004179919A 2004-06-17 2004-06-17 Impact tools Expired - Lifetime JP4407392B2 (en)

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JP4407392B2 JP4407392B2 (en) 2010-02-03

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018179587A1 (en) 2017-03-31 2018-10-04 パナソニックＩｐマネジメント株式会社 Power tool
WO2018220942A1 (en) 2017-05-30 2018-12-06 パナソニックＩｐマネジメント株式会社 Power tool
WO2018220941A1 (en) 2017-05-30 2018-12-06 パナソニックＩｐマネジメント株式会社 Power tool
JP2019042854A (en) * 2017-08-31 2019-03-22 パナソニックＩｐマネジメント株式会社 Electric tool
WO2019058664A1 (en) * 2017-09-25 2019-03-28 パナソニックＩｐマネジメント株式会社 Electric tool

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018179587A1 (en) 2017-03-31 2018-10-04 パナソニックＩｐマネジメント株式会社 Power tool
WO2018220942A1 (en) 2017-05-30 2018-12-06 パナソニックＩｐマネジメント株式会社 Power tool
WO2018220941A1 (en) 2017-05-30 2018-12-06 パナソニックＩｐマネジメント株式会社 Power tool
JP2018202500A (en) * 2017-05-30 2018-12-27 パナソニックＩｐマネジメント株式会社 Electric tool
JP2018202498A (en) * 2017-05-30 2018-12-27 パナソニックＩｐマネジメント株式会社 Electric tool
EP3632626A4 (en) * 2017-05-30 2020-07-01 Panasonic Intellectual Property Management Co., Ltd. Power tool
US11478916B2 (en) 2017-05-30 2022-10-25 Panasonic Intellectual Property Management Co., Ltd. Electric power tool
US11539272B2 (en) 2017-05-30 2022-12-27 Panasonic Intellectual Property Management Co., Ltd. Electric power tool
JP2019042854A (en) * 2017-08-31 2019-03-22 パナソニックＩｐマネジメント株式会社 Electric tool
WO2019058664A1 (en) * 2017-09-25 2019-03-28 パナソニックＩｐマネジメント株式会社 Electric tool
JP2019058961A (en) * 2017-09-25 2019-04-18 パナソニックＩｐマネジメント株式会社 Electric tool
JP7220362B2 (en) 2017-09-25 2023-02-10 パナソニックＩｐマネジメント株式会社 Electric tool

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