JPH07299606A - Bearing dustproof structure - Google Patents
Bearing dustproof structureInfo
- Publication number
- JPH07299606A JPH07299606A JP6091611A JP9161194A JPH07299606A JP H07299606 A JPH07299606 A JP H07299606A JP 6091611 A JP6091611 A JP 6091611A JP 9161194 A JP9161194 A JP 9161194A JP H07299606 A JPH07299606 A JP H07299606A
- Authority
- JP
- Japan
- Prior art keywords
- bearing
- motor
- insulating member
- dustproof structure
- dust
- 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
Links
- 239000000428 dust Substances 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Turning (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Sealing Of Bearings (AREA)
Abstract
(57)【要約】
【目的】 本発明は、軸受の防塵構造に関するものであ
り、その目的は、絶縁部材の形状と軸受収納室周辺の形
状を工夫することで、粉塵の侵入を減らし軸受の寿命向
上を図ることである。
【構成】 モータの回転軸２の回転に追従して、段付軸
部と軸受内輪の間に挟持されている絶縁部材６も一体回
転する。この回転に伴って発生する遠心力と端部に形成
した複数個のフィン６ｄにより粉塵を効果的に吹き飛ば
すと共に付随効果としてモータ１の冷却をも行なう構成
となっている。
(57) [Abstract] [Object] The present invention relates to a dustproof structure of a bearing. An object of the present invention is to reduce the intrusion of dust by improving the shape of the insulating member and the shape of the periphery of the bearing storage chamber. It is to improve the life. [Structure] Following the rotation of the rotary shaft 2 of the motor, the insulating member 6 sandwiched between the stepped shaft portion and the bearing inner ring also rotates integrally. The centrifugal force generated by this rotation and the plurality of fins 6d formed at the ends effectively blow out the dust, and as a concomitant effect, it also cools the motor 1.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、モータの回転軸を軸支
する軸受の防塵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 dustproof structure of a bearing that supports a rotary shaft of a motor.
【０００２】[0002]
【従来の技術】従来を図４及び図５を用いて説明する。
従来の軸受防塵構造によれば、ダストシール８を軸受５
の外輪部５ｂとの間にわずかなスキマＢを確保しながら
内輪部５ａとモータの回転軸２の段付軸２ｃとの間で挟
持し、モータの回転軸２と一体回転することによってそ
の遠心力で粉塵を弾き飛ばす構造であった。しかし、ダ
ストシール８はゴム等の弾性体で形成されているのが一
般的であるため、一体回転に必要な挟持力を確保する手
段として内径部に鋼板等を固着させている。またダスト
シール８の外径寸法は軸受５の外径より若干小さく、軸
受収納室４に接触しないよう寸法決定されている。ま
た、ダストシール８の軸受側端面部８ａには周方向の溝
部８ｂが形成されており、ラビリンスシール効果による
粉塵の侵入を防ぐ構造となっていた。2. Description of the Related Art The prior art will be described with reference to FIGS.
According to the conventional bearing dustproof structure, the dust seal 8 is attached to the bearing 5
It is sandwiched between the inner ring portion 5a and the stepped shaft 2c of the motor rotation shaft 2 while ensuring a slight gap B between the outer ring portion 5b and the outer ring portion 5b of the motor. It was a structure that repels dust with force. However, since the dust seal 8 is generally formed of an elastic body such as rubber, a steel plate or the like is fixed to the inner diameter portion as a means for ensuring the clamping force required for integral rotation. The outer diameter of the dust seal 8 is slightly smaller than the outer diameter of the bearing 5, and is dimensioned so as not to come into contact with the bearing housing chamber 4. A circumferential groove 8b is formed on the bearing-side end surface 8a of the dust seal 8 to prevent dust from entering due to the labyrinth seal effect.
【０００３】[0003]
【発明が解決しようとする課題】従来の防塵構造は、ダ
ストシールの遠心力と径方向のクリアランス、及び、端
面の溝部によるラビリンスシール効果のみで行なってい
るため、比較的粗い粉塵に対しては有効であるものの、
コンクリート、石こう等の微粉末状の粉塵に対しては完
全な粉塵効果を得ることができず、その結果、軸受の寿
命が短くなるという欠点があった。また、鋼板とゴム材
を結合させる構造のため製造コスト高になるという欠点
があった。The conventional dustproof structure is effective for relatively coarse dust because it is performed only by the centrifugal force and radial clearance of the dust seal and the labyrinth seal effect by the groove portion of the end face. Although,
A perfect dust effect cannot be obtained with respect to fine powder dust such as concrete and gypsum, and as a result, the life of the bearing is shortened. In addition, there is a drawback that the manufacturing cost becomes high due to the structure in which the steel plate and the rubber material are bonded together.
【０００４】本発明の目的は、上記従来技術の欠点を無
くし、安価で防塵性能の高い軸受防塵装置を提供するこ
とである。An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a bearing dustproof device which is inexpensive and has high dustproof performance.
【０００５】[0005]
【課題を解決するための手段】上記目的は、絶縁部材の
側面に複数個のフィンを形成し、粉塵を強制的に弾き飛
ばすとともに、粉塵の軸受収納側への侵入経路上に少な
くとも１箇所以上の段差を設けることにより侵入経路を
複雑化することで達成される。また、絶縁部材を比較的
剛性の強いプラスチック材料にすることで製造コストが
安くなり、上記目的が達成される。The above-mentioned object is to form a plurality of fins on the side surface of an insulating member to forcibly blow off dust, and at least at one or more locations on the path of entry of dust to the bearing housing side. This is achieved by complicating the intrusion route by providing the step. Further, by using a plastic material having a relatively high rigidity as the insulating member, the manufacturing cost can be reduced and the above object can be achieved.
【０００６】[0006]
【作用】上記のように構成された防塵構造は、絶縁部材
の一体回転による遠心力作用の他に、端面に形成した複
数個のフィンにより粉塵を吹き飛ばすように動作し、ま
た、軸受収納室との空間部に形成した段差部によって侵
入経路を複雑化することで粉塵が軸受側へ侵入するチャ
ンスを極端に減らすように動作する。The dustproof structure constructed as described above has a function of centrifugal force due to the integral rotation of the insulating member, and a plurality of fins formed on the end face to blow away the dust. By making the intrusion route complicated by the stepped portion formed in the space portion, the operation is performed to extremely reduce the chance of dust invading the bearing side.
【０００７】[0007]
【実施例】以下、本発明による一実施例を電気ディスク
グラインダを用いて説明する。本発明による軸受の防塵
構造は、図１乃至図３に示すようにモータ１、モータ１
を支持しているモータの回転軸２、モータ１を収納して
いるハウジング３、ハウジング３内に形成された軸受収
納室４、軸受収納室４内に配設され、モータの回転軸２
を軸支する軸受５、軸受５とモータの回転軸２の間で挟
持された絶縁部材６によって構成されている。以下詳細
について説明する。モータの回転軸２は二重絶縁構造に
対応するため、金属部外周に絶縁用樹脂２ａが固着され
ている。従って、軸受５の軸支部２ｂとの間に段付軸部
２ｃが形成される形状になっている。絶縁用樹脂２ａは
熱硬化性樹脂を使用しているが、耐衝撃性に対する強度
が弱いという欠点があるため、直接角部２ｄに力がかか
らないよう段付軸部２ｃとの間に適度なスキマＡ1 を与
えている。軸受５は寿命向上を図るため、大きなサイズ
を選択している。そのため、軸受５の内径が大きくな
り、図３に示すようにＡ2寸法が小さくなっている。絶
縁部材６は段付軸部２Ｃと軸受５の間で挟持されている
が、前述したようにＡ2 寸法が小さくなっていることも
あって、挟持のみの固定では固着力が不安定となる。従
って、図２に示すように内径部６ａに軸方向に沿って筋
状の突起部Ａ６ｂを形成し、絶縁用樹脂２ａの外周面と
適度な締め代をもって固着できるようにしている。更
に、軸受５側の端面部には軸受５の内輪部５ａと接触す
る位置に突起部６ｃを形成し、軸方向にも適度な締め代
を与えることができるようにしている。以上により、絶
縁部材６はモータの回転軸２に対して従来技術より確実
に固着されるため、モータ１との一体回転に対し何の支
障もなくできるようになっている。またモータ１側への
端面部には複数個のフィン６ｄが形成されている。フィ
ンは、図２に示すようにモータの回転軸２の回転方向に
影響されないよう中心から外周に向かって放射状に広が
る形状にしている。これによって粉塵が絶縁部材６の方
に入ってきても強制的に吹き飛ばし、軸受５側に侵入す
るのを防止している。更に、外径部は段付とし、段差部
６ｆが形成される形状になっている。軸受収納室４の端
面４ａは軸受５の端面５ｃとの間に比較的大きなスペー
スＤが確保できるようにしており、前述した絶縁部材６
の段差部６ｆとの間にわずかなスキマＥができるよう寸
法決定されている。この段差部６ｆは、フィン６ｄによ
って吹き飛ばしきれなかったわずかな量の粉塵に対し再
度遠心力で吹き飛ばすとともに軸受５側への空間経路を
複雑化することによって侵入するチャンスを大幅に減ら
している。それでも侵入してきた粉塵に対しては軸受側
端部に従来技術と同じ周方向溝６ｅを２箇所形成し、同
等のラビリンスシール効果によってほぼ完全に粉塵の侵
入を遮断できるようにしている。更に、絶縁部材６に形
成したフィン６ｄは、その回転によって発生する送風に
よって近傍に配置されているコンミテーター７を強制的
に冷却する機能も兼ねている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to an electric disk grinder. The bearing dustproof structure according to the present invention includes a motor 1 and a motor 1 as shown in FIGS.
A rotary shaft 2 of a motor supporting the motor, a housing 3 accommodating the motor 1, a bearing housing chamber 4 formed in the housing 3, a rotary shaft 2 of the motor disposed in the bearing housing chamber 4.
Is formed of a bearing 5 that rotatably supports and an insulating member 6 that is sandwiched between the bearing 5 and the rotating shaft 2 of the motor. The details will be described below. Since the rotating shaft 2 of the motor corresponds to the double insulating structure, the insulating resin 2a is fixed to the outer periphery of the metal portion. Therefore, the stepped shaft portion 2c is formed between the bearing 5 and the shaft support portion 2b. Although the insulating resin 2a uses a thermosetting resin, it has a weakness with respect to impact resistance. Therefore, an appropriate gap is provided between the stepped shaft portion 2c and the corner portion 2d so that no force is directly applied to the corner portion 2d. I am giving A 1 . A large size is selected for the bearing 5 in order to improve the life. Therefore, the inner diameter of the bearing 5 becomes large, and the A 2 dimension becomes small as shown in FIG. The insulating member 6 is sandwiched between the stepped shaft portion 2C and the bearing 5. However, since the A 2 size is small as described above, the fixing force becomes unstable if only sandwiched. . Therefore, as shown in FIG. 2, a streak-like projection A6b is formed in the inner diameter portion 6a along the axial direction so that it can be fixed to the outer peripheral surface of the insulating resin 2a with an appropriate tightening margin. Further, a protrusion 6c is formed on the end surface portion on the bearing 5 side at a position in contact with the inner ring portion 5a of the bearing 5 so that an appropriate tightening margin can be given in the axial direction. As described above, the insulating member 6 is more securely fixed to the rotary shaft 2 of the motor as compared with the prior art, so that the integral rotation with the motor 1 can be performed without any trouble. Further, a plurality of fins 6d are formed on the end surface portion toward the motor 1 side. As shown in FIG. 2, the fins are shaped so as to spread radially from the center toward the outer periphery so as not to be affected by the rotation direction of the rotary shaft 2 of the motor. As a result, even if dust enters the insulating member 6, it is forcibly blown off and prevented from entering the bearing 5 side. Further, the outer diameter portion is stepped so that the stepped portion 6f is formed. The end surface 4a of the bearing housing chamber 4 is arranged so that a relatively large space D can be secured between the end surface 4a and the end surface 5c of the bearing 5.
The dimension is determined so that a slight clearance E is formed between the stepped portion 6f and the stepped portion 6f. The stepped portion 6f repulsively blows off a small amount of dust that could not be blown off by the fins 6d by centrifugal force again and complicates the spatial path to the bearing 5 side, thereby greatly reducing the chance of intrusion. Still, with respect to the dust that has entered, two circumferential grooves 6e, which are the same as those in the prior art, are formed at the end portion on the bearing side so that the dust can be almost completely blocked by the equivalent labyrinth seal effect. Further, the fins 6d formed on the insulating member 6 also have a function of forcibly cooling the commutator 7 arranged in the vicinity by the air flow generated by the rotation thereof.
【０００８】以上のように説明した絶縁部材６は複雑な
形状となってしまうが、これは比較的強度の高いプラス
チック材を選定し、射出成形できるようにすることで従
来の欠点でもあったコスト高を解消し製造コストの安い
防塵装置を提供することができる。The insulating member 6 described above has a complicated shape. However, this is a cost which was a drawback of the prior art because a plastic material having a relatively high strength is selected and injection molding is performed. It is possible to provide a dustproof device that eliminates the high cost and has a low manufacturing cost.
【０００９】[0009]
【発明の効果】本発明によれば、絶縁部材の端部に複数
個のフィンを形成したのでモータの回転軸の回転に追従
して発生する遠心力と前記フィンによって粉塵を効果的
に吹き飛ばすことができ且つ絶縁部材の外径部と軸受収
納室との空間上に段差を形成したので、軸受側へ侵入す
る粉塵の量を大幅に低減できるので軸受の寿命向上が図
れる。またフィンの回転によって生ずる送風によりモー
タを冷却することができモータの寿命向上、能力向上を
図ることができる。更に絶縁部材を比較的強度の高いプ
ラスチック材にすることで複雑な形状ができると共に製
造コストを大幅に低減することができる。According to the present invention, since a plurality of fins are formed at the end of the insulating member, the centrifugal force generated following the rotation of the rotary shaft of the motor and the fins effectively blow dust. In addition, since a step is formed in the space between the outer diameter portion of the insulating member and the bearing housing chamber, the amount of dust that enters the bearing side can be greatly reduced, and the life of the bearing can be improved. Further, the motor can be cooled by the air blown by the rotation of the fins, so that the life of the motor and the performance thereof can be improved. Further, by forming the insulating member from a plastic material having a relatively high strength, a complicated shape can be formed and the manufacturing cost can be significantly reduced.
【図１】 本発明の軸受防塵構造の一実施例を示す縦断
側面図である。FIG. 1 is a vertical sectional side view showing an embodiment of a bearing dustproof structure of the present invention.
【図２】 本発明の軸受防塵構造の一実施例を示す正面
図及び断面図である。FIG. 2 is a front view and a sectional view showing an embodiment of the bearing dustproof structure of the present invention.
【図３】 本発明の軸受防塵構造の一実施例を示す側面
図である。FIG. 3 is a side view showing an embodiment of the bearing dustproof structure of the present invention.
【図４】 従来技術の軸受防塵構造を示す縦断側面図で
ある。FIG. 4 is a vertical cross-sectional side view showing a conventional bearing dustproof structure.
【図５】 従来技術の軸受防塵構造を示す正面図及び断
面図である。5A and 5B are a front view and a cross-sectional view showing a conventional bearing dustproof structure.
１はモータ、２はモータの回転軸、３は段付軸部、４ａ
は端面、５は軸受、６は絶縁部材、６ａは内径部、６ｂ
は突起部Ａ、６ｃは突起部、６ｄはフィン、６ｅは溝、
６ｆは段差部、７はコンミテーターである。1 is a motor, 2 is a rotation shaft of the motor, 3 is a stepped shaft portion, 4a
Is an end face, 5 is a bearing, 6 is an insulating member, 6a is an inner diameter portion, 6b
Is a projection A, 6c is a projection, 6d is a fin, 6e is a groove,
6f is a stepped portion, and 7 is a commutator.
Claims (4)
軸受防塵構造において、前記モータの回転軸と一体回転
し且つ側面に複数個のフィンを形成した絶縁部材を前記
軸受と前記モータの回転軸に形成した段付軸部との間に
配設したことを特徴とする軸受防塵構造。1. A bearing dustproof structure in which a rotating shaft of a motor is rotatably supported by a bearing, and an insulating member that rotates integrally with the rotating shaft of the motor and has a plurality of fins formed on its side surface is used to rotate the bearing and the motor. A bearing dustproof structure characterized by being arranged between a stepped shaft portion formed on a shaft.
室との空間上に少なくとも１箇所以上の段差を設けたこ
とを特徴とする請求項１記載の軸受防塵構造。2. The bearing dustproof structure according to claim 1, wherein at least one step is provided in the space between the outer diameter portion of the insulating member and the bearing accommodating chamber.
し、前記モータの回転軸の軸上に固着したことを特徴と
する請求項１乃至請求項２記載の軸受防塵構造。3. The bearing dustproof structure according to claim 1, wherein a protrusion is formed on the inner diameter of the insulating member, and the protrusion is fixed on the shaft of the rotating shaft of the motor.
おいて、前記絶縁部材の端面部に突起部を形成したこと
を特徴とする請求項１乃至請求項３記載の軸受防塵構
造。4. The bearing dustproof structure according to claim 1, wherein a protrusion is formed on an end surface portion of the insulating member at a position where it contacts the end surface of the inner ring of the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6091611A JPH07299606A (en) | 1994-04-28 | 1994-04-28 | Bearing dustproof structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6091611A JPH07299606A (en) | 1994-04-28 | 1994-04-28 | Bearing dustproof structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07299606A true JPH07299606A (en) | 1995-11-14 |
Family
ID=14031372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6091611A Pending JPH07299606A (en) | 1994-04-28 | 1994-04-28 | Bearing dustproof structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07299606A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007152525A (en) * | 2005-12-07 | 2007-06-21 | Makita Corp | Grinder |
| JP2014124745A (en) * | 2012-12-27 | 2014-07-07 | Ryobi Ltd | Electric tool |
| JP2014144511A (en) * | 2013-01-30 | 2014-08-14 | Ryobi Ltd | Electric power tool |
| WO2016002542A1 (en) * | 2014-06-30 | 2016-01-07 | 日立工機株式会社 | Electric tool |
| JP2017017769A (en) * | 2015-06-26 | 2017-01-19 | 日立工機株式会社 | Electric tool |
| CN113477953A (en) * | 2021-05-20 | 2021-10-08 | 深圳市爱贝科精密工业股份有限公司 | Central air outlet mechanism for mechanical shaft |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5553781Y2 (en) * | 1974-05-04 | 1980-12-12 | ||
| JPS55177549U (en) * | 1979-06-07 | 1980-12-19 | ||
| JPH02110764U (en) * | 1989-02-23 | 1990-09-05 |
-
1994
- 1994-04-28 JP JP6091611A patent/JPH07299606A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5553781Y2 (en) * | 1974-05-04 | 1980-12-12 | ||
| JPS55177549U (en) * | 1979-06-07 | 1980-12-19 | ||
| JPH02110764U (en) * | 1989-02-23 | 1990-09-05 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007152525A (en) * | 2005-12-07 | 2007-06-21 | Makita Corp | Grinder |
| JP2014124745A (en) * | 2012-12-27 | 2014-07-07 | Ryobi Ltd | Electric tool |
| JP2014144511A (en) * | 2013-01-30 | 2014-08-14 | Ryobi Ltd | Electric power tool |
| WO2016002542A1 (en) * | 2014-06-30 | 2016-01-07 | 日立工機株式会社 | Electric tool |
| JP2017017769A (en) * | 2015-06-26 | 2017-01-19 | 日立工機株式会社 | Electric tool |
| CN113477953A (en) * | 2021-05-20 | 2021-10-08 | 深圳市爱贝科精密工业股份有限公司 | Central air outlet mechanism for mechanical shaft |
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