JPH0985618A - Rotor mounting structure for motor-driven tool - Google Patents

Rotor mounting structure for motor-driven tool

Info

Publication number
JPH0985618A
JPH0985618A JP25141295A JP25141295A JPH0985618A JP H0985618 A JPH0985618 A JP H0985618A JP 25141295 A JP25141295 A JP 25141295A JP 25141295 A JP25141295 A JP 25141295A JP H0985618 A JPH0985618 A JP H0985618A
Authority
JP
Japan
Prior art keywords
nut
lock nut
spindle
base
grindstone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP25141295A
Other languages
Japanese (ja)
Inventor
Masayoshi Kondo
昌義 近藤
Kunio Amano
邦男 天野
Hideki Okubo
秀喜 大久保
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Makita Corp
Original Assignee
Makita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Makita Corp filed Critical Makita Corp
Priority to JP25141295A priority Critical patent/JPH0985618A/en
Publication of JPH0985618A publication Critical patent/JPH0985618A/en
Pending legal-status Critical Current

Links

Landscapes

  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent a rotor fixing nut member from being tightened excessively and improve workability for changing a rotor. SOLUTION: A grinding wheel 11 mounted on the spindle 4 of a grinder 1 is clamped and fixed with an inner flange 12 and a lock nut 13. Regarding this lock nut 13, a nut part 15 with a screw hole for being screwed to a screw part 10 has a ring type groove 16 at the side of the grinding wheel 11, and this ring type groove 16 is internally provided with a thrust needle bearing 20 formed out of a ring type flat washer 17, a lock nut base 18 and a needle gauge 19 laid between the washer 17 and the base 18. Also, the lock nut base 18 projects from the nut part 15 toward the grinding wheel 11 and comes in contact therewith. When the spindle 4 rotates in a direction for tightening the lock nut 13, the lock nut base 18 slides on the nut part 15, thereby preventing the nut part 15 from being tightened excessively beyond proper tightening torque.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、例えば円盤状の砥
石を回転させて研磨作業を行うグラインダ等の電動工具
において、前記砥石等の回転体をスピンドルに取り付け
る構造に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a rotating body such as a grindstone is attached to a spindle in an electric tool such as a grinder for rotating a disk-shaped grindstone for polishing work.

【0002】[0002]

【従来の技術】従来の取付構造において、例えばグライ
ンダでは、スピンドルの先端に貫通させた円盤状の砥石
を挟んで本体側にインナフランジ、反対側にナット部材
としてのアウタフランジを夫々設け、アウタフランジを
スピンドル先端へ螺着することで、砥石をインナフラン
ジとアウタフランジとで挟持してスピンドルと一体化さ
せている。又取り外しの際は、アウタフランジに設けた
透孔へスパナのピンを挿入し、スパナでアウタフランジ
を回転させてスピンドルから取り外し、砥石等の交換を
可能としていた。
2. Description of the Related Art In a conventional mounting structure, for example, in a grinder, an inner flange is provided on the main body side and an outer flange as a nut member is provided on the opposite side with a disk-shaped grindstone penetrating the tip of a spindle interposed therebetween. By screwing to the spindle tip, the grindstone is sandwiched between the inner flange and the outer flange and integrated with the spindle. Further, at the time of removal, a pin of a spanner is inserted into a through hole provided in the outer flange, and the outer flange is rotated by the spanner to remove it from the spindle so that a grindstone or the like can be replaced.

【0003】[0003]

【発明が解決しようとする課題】しかし上記グラインダ
等の電動工具では、スピンドルはアウタフランジを締め
込む方向に回転するため、電動工具の駆動に伴うスピン
ドルの回転によって、アウタフランジは一層強く締め付
けられることになる。従って摩耗した砥石等を交換する
際、スパナを使用してもアウタフランジを回転させて取
り外すのに強い力が必要となり、作業性が非常に悪くな
っていた。
However, in the electric tool such as the grinder, the spindle rotates in the direction in which the outer flange is tightened. Therefore, the outer flange is tightened more strongly by the rotation of the spindle accompanying the driving of the electric tool. become. Therefore, when exchanging a worn grindstone or the like, a strong force is required to rotate and remove the outer flange even if a spanner is used, resulting in extremely poor workability.

【0004】[0004]

【課題を解決するための手段】そこで本発明は、上記ス
ピンドルの回転によるアウタフランジ等のナット部材の
過度の締め付けをなくして、回転体交換等の作業性を好
適とする電動工具における回転体の取付構造を提供する
もので、その構成は、前記ナット部材と回転体との間
に、スラスト軸受を介在させたことを特徴とするもので
ある。又前記スラスト軸受を、ころがり又はすべり軸受
とするのが望ましい。又前記ナット部材に、前記スラス
ト軸受の外周を覆うカバー部を設けると共に、スラスト
軸受に、前記カバー部との間をシールするシール部材を
設けるのが望ましい。
Therefore, the present invention eliminates the excessive tightening of nut members such as the outer flange due to the rotation of the spindle, thereby facilitating the workability such as the replacement of the rotating body. The present invention provides a mounting structure, which is characterized in that a thrust bearing is interposed between the nut member and the rotating body. Further, it is desirable that the thrust bearing is a rolling or sliding bearing. Further, it is desirable that the nut member is provided with a cover portion that covers the outer periphery of the thrust bearing, and that the thrust bearing is provided with a seal member that seals between the thrust bearing and the cover portion.

【0005】[0005]

【発明の実施の形態】以下本発明の実施の形態を図面に
基づいて説明する。図1はグラインダ1の先端部の説明
図で、ギヤハウジング2内に突出するモータ軸3は、ス
ピンドル4と一体のベベルギヤ5と噛合して、ニードル
ベアリング6、ボールベアリング7によってモータ軸3
と直交状に軸支されるスピンドル4を回転させる。スピ
ンドル4におけるベアリングボックス8からの突出部分
は、大径の二面幅部9とその先端側のネジ部10とに形
成され、スピンドル4に貫通される円盤状の砥石11
は、二面幅部9に嵌合するインナフランジ12と、ネジ
部10に螺合されるロックナット13との間で挟持固定
される。又図2はロックナット13の詳細を示すもの
で、スピンドル4のネジ部10に螺合されるネジ孔14
を有した円盤状のナット部15は、砥石11側にリング
状の溝16を備え、その溝16内に、同じくリング状の
フラットワッシャ17、ロックナットベース18と、両
者の間に配置されるニードルゲージ19とからなるスラ
ストニードルベアリング20を設けている。特にここで
はロックナットベース18が、ナット部15から砥石1
1側へ突出した状態となって、このロックナットベース
18が常に砥石11と当接することになる。同時にこの
ロックナットベース18の外径はインナフランジ12の
外径と略一致しており、砥石11を挟持する当接部分の
均等化が図られている。更に溝16への収納により、ス
ラストニードルベアリング20の周囲にはカバー部21
が周設されることになる。尚22は、ナット部15とロ
ックナットベース18との間に設けられるシール部材と
してのOリング、23,23は、レンチ24のピン24
a,24aが挿入される挿入孔である。
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of the tip of the grinder 1. The motor shaft 3 protruding into the gear housing 2 meshes with a bevel gear 5 integrated with the spindle 4, and the motor shaft 3 is driven by a needle bearing 6 and a ball bearing 7.
The spindle 4 which is axially supported is rotated. A protruding portion of the spindle 4 from the bearing box 8 is formed in a large-diameter double-width portion 9 and a screw portion 10 on the tip side thereof, and a disc-shaped grindstone 11 that is penetrated by the spindle 4
Is clamped and fixed between an inner flange 12 that fits in the two-sided width portion 9 and a lock nut 13 that is screwed into the screw portion 10. 2 shows the details of the lock nut 13, which has a screw hole 14 screwed into the screw portion 10 of the spindle 4.
The disk-shaped nut portion 15 having a ring-shaped groove 16 is provided on the grindstone 11 side, and the ring-shaped flat washer 17 and the lock nut base 18 are arranged in the groove 16 and between them. A thrust needle bearing 20 including a needle gauge 19 is provided. Particularly, here, the lock nut base 18 moves from the nut portion 15 to the grindstone 1.
The lock nut base 18 comes into contact with the grindstone 11 at all times in the state of protruding to the 1 side. At the same time, the outer diameter of the lock nut base 18 is substantially the same as the outer diameter of the inner flange 12, and the abutting portion that holds the grindstone 11 is made uniform. Further, by being housed in the groove 16, the cover portion 21 is provided around the thrust needle bearing 20.
Will be installed around. Reference numeral 22 is an O-ring as a seal member provided between the nut portion 15 and the lock nut base 18, and 23 and 23 are pins 24 of the wrench 24.
a and 24a are insertion holes.

【0006】以上の如く構成されたグラインダ1は、砥
石11の装着は、従来と同様にインナフランジ12、砥
石11の順でスピンドル4へ取り付け、最後にネジ部1
0へロックナット13を螺合させて手で締め付けるだけ
で良い(手締めによる仮締め)。この手締めの後、モー
タを駆動させてスピンドル4を回転させると、砥石11
の適正締付トルクに達するまでは、ネジ部10の摩擦抵
抗がスラストニードルベアリング20部分での摩擦抵抗
より小さいので、スピンドル4はロックナット13を締
め込む方向に回転し、適正締付トルクまで増し締めがな
されることになり、ここで砥石11の取付が完了する。
そして研磨作業を行う際には、スピンドル4はロックナ
ット13を更に締め込む方向へ回転する(例えば砥石1
1に過負荷が加わったとき等)が、スラストニードルベ
アリング20により、砥石11と当接するロックナット
ベース18がナット部15に対して滑って、ナット部1
5の締め込み方向への回転を防止するから、ロックナッ
ト13の適正締付トルク以上の過度の締め付けはなくな
り、摩耗した砥石11の取り外しをレンチ24等で無理
なく行うことができる。又ここでは特にスラストニード
ルベアリング20の採用により、ロックナット13の軸
方向の幅を最小限に抑えることができるから、ロックナ
ット13に軸受けを組み込んでも砥石11からの突出部
分が大きくならず、ロックナット13が作業の邪魔にな
ることがない。更にカバー部21とOリング22によっ
て、スラストニードルベアリング20への塵埃の進入を
抑えることもできるのである。
In the grinder 1 constructed as described above, the grindstone 11 is mounted on the spindle 4 in the order of the inner flange 12 and the grindstone 11 as in the conventional case, and finally the screw part 1 is attached.
It is sufficient to screw the lock nut 13 to 0 and tighten it by hand (temporary tightening by hand). After this manual tightening, the motor is driven to rotate the spindle 4, and the grindstone 11
Since the frictional resistance of the threaded portion 10 is smaller than the frictional resistance of the thrust needle bearing 20 until the appropriate tightening torque is reached, the spindle 4 rotates in the direction of tightening the lock nut 13 to increase the appropriate tightening torque. The tightening is done, and the attachment of the grindstone 11 is completed here.
When performing the polishing operation, the spindle 4 rotates in the direction in which the lock nut 13 is further tightened (for example, the grindstone 1
1 is overloaded), the thrust needle bearing 20 causes the lock nut base 18 that abuts the grindstone 11 to slide with respect to the nut portion 15,
Since the rotation of 5 in the tightening direction is prevented, excessive tightening of the lock nut 13 beyond the appropriate tightening torque is eliminated, and the worn grindstone 11 can be removed with a wrench 24 or the like without difficulty. Further, here, in particular, since the axial width of the lock nut 13 can be minimized by adopting the thrust needle bearing 20, even if a bearing is incorporated in the lock nut 13, the protruding portion from the grindstone 11 does not become large, and the lock nut 13 is locked. The nut 13 does not interfere with the work. Further, the cover portion 21 and the O-ring 22 can prevent dust from entering the thrust needle bearing 20.

【0007】尚ロックナットと砥石との間に介在される
スラスト軸受は、ころがり軸受としては上記ニードルベ
アリング以外にボールベアリング等の採用も可能で、す
べり軸受として、テフロンシート、ナイロンシート等も
使用できる。又これらのスラスト軸受を介在させる形態
も、上記のようにロックナットへの組み込み以外に、別
体のスラスト軸受を砥石とナット部材との間で挟むよう
に設けても良い。
As the thrust bearing interposed between the lock nut and the grindstone, a ball bearing can be adopted as the rolling bearing in addition to the above needle bearing, and a Teflon sheet, a nylon sheet or the like can be used as the sliding bearing. . Also, in the form in which these thrust bearings are interposed, in addition to the incorporation into the lock nut as described above, a separate thrust bearing may be provided so as to be sandwiched between the grindstone and the nut member.

【0008】[0008]

【発明の効果】以上本発明によれば、電動工具の運転に
よるナット部材の適正締付トルク以上の締まり過ぎはな
くなり、砥石等の回転体の取り外し作業が簡単に行え
る。又スラスト軸受をころがり又はすべり軸受とすれ
ば、ナット部材に軸受を組み込んでもナット部材の軸方
向の幅を最小限に抑えることができ、作業の邪魔になる
ことはない。更にナット部材にカバー部を、スラスト軸
受とカバー部材との間にシール部材を夫々設ければ、好
適な防塵効果も得られる。
As described above, according to the present invention, excessive tightening of the nut member beyond the proper tightening torque due to the operation of the electric tool is eliminated, and the work of removing the rotating body such as the grindstone can be easily performed. Further, if the thrust bearing is a rolling or sliding bearing, the axial width of the nut member can be minimized even if the bearing is incorporated into the nut member, which does not interfere with the work. Further, by providing the nut member with the cover portion and the seal member between the thrust bearing and the cover member, a suitable dustproof effect can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】グラインダの説明図である。FIG. 1 is an explanatory diagram of a grinder.

【図2】ロックナットの説明図である。FIG. 2 is an explanatory diagram of a lock nut.

【符号の説明】[Explanation of symbols]

1・・グラインダ、2・・ギヤハウジング、3・・モー
タ軸、4・・スピンドル、10・・ネジ部、11・・砥
石、12・・インナフランジ、13・・ロックナット、
15・・ナット部、16・・溝、17・・フラットワッ
シャ、18・・ロックナットベース、19・・ニードル
ゲージ、20・・スラストニードルベアリング、21・
・カバー部、22・・Oリング。
1 ... Grinder, 2 Gear housing, 3 Motor shaft, 4 Spindle, 10 Screw part, 11 Grindstone, 12 inner flange, 13 lock nut,
15 ・ ・ Nut part, 16 ・ ・ Groove, 17 ・ ・ Flat washer, 18 ・ ・ Lock nut base, 19 ・ ・ Needle gauge, 20 ・ ・ Thrust needle bearing, 21 ・
・ Cover, 22 ・ ・ O-ring.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 本体から突出したスピンドルに直交状に
貫通される回転体を、前記スピンドルに設けられる本体
側のインナフランジと、スピンドル先端に螺合されるナ
ット部材とで挟持固定可能とした電動工具における回転
体の取付構造であって、 前記ナット部材と回転体との相互間に、スラスト軸受を
介在させたことを特徴とする電動工具における回転体の
取付構造。
1. An electric motor in which a rotating body penetrating a spindle protruding from a main body in an orthogonal direction can be clamped and fixed by an inner flange on the main body side provided on the spindle and a nut member screwed to a tip end of the spindle. A rotating body mounting structure for a tool, wherein a thrust bearing is interposed between the nut member and the rotating body.
【請求項2】 前記スラスト軸受が、ころがり又はすべ
り軸受である請求項1に記載の電動工具における回転体
の取付構造。
2. The mounting structure for a rotating body in an electric tool according to claim 1, wherein the thrust bearing is a rolling or sliding bearing.
【請求項3】 前記ナット部材に、前記スラスト軸受の
外周を覆うカバー部を設けると共に、スラスト軸受に、
前記カバー部との間をシールするシール部材を設けた請
求項1又は2に記載の電動工具における回転体の取付構
造。
3. The nut member is provided with a cover portion for covering the outer circumference of the thrust bearing, and the thrust bearing is provided with:
The mounting structure for a rotating body in an electric power tool according to claim 1, further comprising a sealing member that seals between the cover and the cover.
JP25141295A 1995-09-28 1995-09-28 Rotor mounting structure for motor-driven tool Pending JPH0985618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25141295A JPH0985618A (en) 1995-09-28 1995-09-28 Rotor mounting structure for motor-driven tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25141295A JPH0985618A (en) 1995-09-28 1995-09-28 Rotor mounting structure for motor-driven tool

Publications (1)

Publication Number Publication Date
JPH0985618A true JPH0985618A (en) 1997-03-31

Family

ID=17222465

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25141295A Pending JPH0985618A (en) 1995-09-28 1995-09-28 Rotor mounting structure for motor-driven tool

Country Status (1)

Country Link
JP (1) JPH0985618A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4707913B2 (en) * 1999-11-12 2011-06-22 三京ダイヤモンド工業株式会社 Attachment member for rotary blade to electric tool and the like, and rotary blade formed by attaching the attachment member
KR101246803B1 (en) * 2010-11-17 2013-03-26 양산기공 주식회사 The rocking structure of grinder wheel
JP2014161948A (en) * 2013-02-25 2014-09-08 Disco Abrasive Syst Ltd Grinding device and method of mounting grinding wheel
CN104225976A (en) * 2014-10-14 2014-12-24 淮北市一环矿山机械有限公司 Lifting device buffer
CN111791118A (en) * 2020-07-23 2020-10-20 罗静婷 Non ferrous metal product grinding device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4707913B2 (en) * 1999-11-12 2011-06-22 三京ダイヤモンド工業株式会社 Attachment member for rotary blade to electric tool and the like, and rotary blade formed by attaching the attachment member
KR101246803B1 (en) * 2010-11-17 2013-03-26 양산기공 주식회사 The rocking structure of grinder wheel
JP2014161948A (en) * 2013-02-25 2014-09-08 Disco Abrasive Syst Ltd Grinding device and method of mounting grinding wheel
CN104225976A (en) * 2014-10-14 2014-12-24 淮北市一环矿山机械有限公司 Lifting device buffer
CN104225976B (en) * 2014-10-14 2015-10-28 淮北市一环矿山机械有限公司 Lifting device buffer
CN111791118A (en) * 2020-07-23 2020-10-20 罗静婷 Non ferrous metal product grinding device
CN111791118B (en) * 2020-07-23 2021-11-16 罗静婷 Non ferrous metal product grinding device

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