JP2003136435A - Electrically-driven tool - Google Patents
Electrically-driven toolInfo
- Publication number
- JP2003136435A JP2003136435A JP2001334501A JP2001334501A JP2003136435A JP 2003136435 A JP2003136435 A JP 2003136435A JP 2001334501 A JP2001334501 A JP 2001334501A JP 2001334501 A JP2001334501 A JP 2001334501A JP 2003136435 A JP2003136435 A JP 2003136435A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- seal
- casing
- seal washer
- member fixed
- 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.)
- Granted
Links
Landscapes
- Portable Power Tools In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、高速回転する駆動
軸と従動軸を備え、それぞれの軸の支持部にベアリング
と低粘度の潤滑剤が外部へ流出させないためのシール手
段を備えた伝動装置ケーシングを有する手持ち式電動工
具、特にディスクグラインダの伝動装置ケーシングのシ
ール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 transmission device having a drive shaft and a driven shaft that rotate at high speed, and a bearing portion and a seal means for preventing a low-viscosity lubricant from flowing out to a support portion of each shaft. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held power tool having a casing, and more particularly to a seal structure for a transmission casing of a disc grinder.
【０００２】[0002]
【従来の技術】従来のディスクグラインダは、図５及び
図６に示すように駆動軸であるモータ軸２にベアリング
３とカバー５を有し、ケーシング４にネジ１３により固
定されている。ベアリング３の内側には、フェルト製の
シール円板９とこのシール円板９の外周と両側面を覆い
シール円板９を所定量圧縮する鉄製のケース１４とから
なるシールパッキン１５がケーシング４に圧入されてお
り、且つシール円板９がモータ軸２に接触するよう構成
することでケーシング４のシール手段となっていた。つ
まり、シールパッキン１５のケース１４をケーシング４
に圧入することでシールパッキン１５とケーシング４の
間をシールし、シール円板９を所定量圧縮し潤滑剤を所
定量吸収することで潤滑剤の透過を防止し、シール円板
９がモータ軸２に接触することでシール円板９とモータ
軸２の間をシールしていた。2. Description of the Related Art As shown in FIGS. 5 and 6, a conventional disc grinder has a bearing 3 and a cover 5 on a motor shaft 2 which is a drive shaft, and is fixed to a casing 4 by screws 13. Inside the bearing 3, a seal packing 15 composed of a felt-made sealing disc 9 and an iron case 14 that covers the outer periphery and both side surfaces of the sealing disc 9 and compresses the sealing disc 9 by a predetermined amount is installed in the casing 4. It was press-fitted and constituted so that the seal disk 9 was brought into contact with the motor shaft 2 to serve as a sealing means for the casing 4. That is, the case 14 of the seal packing 15 is attached to the casing 4
The seal packing 15 and the casing 4 are sealed by being press-fitted into the seal disk 15. The seal disk 9 is compressed by a predetermined amount and the lubricant is absorbed by a predetermined amount to prevent the permeation of the lubricant. By contacting with 2, the seal disk 9 and the motor shaft 2 were sealed.
【０００３】[0003]
【発明が解決しようとする課題】上記シール手段（シー
ル円板９とケース１４からなるシールパッキン１５）
は、シール円板９を所定量圧縮してケース１４で固定
し、且つケース１４外周を圧入に対応する高精度とする
こと、そしてケーシング４も圧入に対応する高精度とし
ているため製造上コスト高となっていた。更にシールパ
ッキン１５をケーシング４に圧入するため、モータ軸２
をケーシング４に組込んだ後に狭いケーシング４内でピ
ニオン６を組立てナット７で固定する必要があり組立に
時間がかかり製造コスト高となっていた。The above-mentioned sealing means (seal packing 15 consisting of the sealing disc 9 and the case 14)
Is high in manufacturing cost because the seal disk 9 is compressed by a predetermined amount and fixed by the case 14, and the outer circumference of the case 14 is made highly accurate to be press-fitted, and the casing 4 is also made highly accurate to be press-fitted. It was. Further, since the seal packing 15 is press-fitted into the casing 4, the motor shaft 2
It is necessary to assemble the pinion 6 in the narrow casing 4 after fixing it to the casing 4 and fix the pinion 6 with the nut 7, which requires a long time for assembling, resulting in a high manufacturing cost.
【０００４】本発明の目的は、上記問題を解消し、組立
性に優れた安価なシール手段を有する電動工具を提供す
ることである。An object of the present invention is to solve the above problems and to provide an electric power tool having an inexpensive sealing means which is excellent in assemblability.
【０００５】[0005]
【課題を解決するための手段】上記目的は、フェルトな
どの低粘度の潤滑剤を吸収・放出可能な材料からなるド
ーナッツ状のシール円板とシールワッシャを設け、軸を
ケーシングに組立てることによりシール円板内周が軸ま
たは軸に固定された部材と密に接触し、且つシール円板
外周がケーシングの支持部外周に密に接触し、更にシー
ル円板が回転不能となるようにシールワッシャとベアリ
ングにより所定量軸方向に押圧されることにより達成さ
れる。The above object is to provide a donut-shaped seal disk and a seal washer made of a material capable of absorbing and releasing a low-viscosity lubricant such as felt, and to seal the shaft by assembling it in a casing. A seal washer is provided so that the inner circumference of the disk comes into close contact with the shaft or a member fixed to the shaft, the outer circumference of the seal disk comes into close contact with the outer circumference of the supporting portion of the casing, and the seal disk becomes non-rotatable. This is achieved by axially pressing a predetermined amount by the bearing.
【０００６】また、軸または軸に固定された部材に凸部
を設け、軸または軸に固定された部材にシールワッシャ
とシール円板とベアリングを組立てた状態で凸部により
シールワッシャを介してシール円板が軸方向に押圧さ
れ、ケーシングに組立てることにより更にシール円板が
軸方向に押圧され、シールワッシャが凸部から所定量離
れることにより達成される。Further, the shaft or the member fixed to the shaft is provided with a convex portion, and the seal washer, the seal disk and the bearing are assembled to the shaft or the member fixed to the shaft, and the convex portion seals through the seal washer. This is achieved by pressing the disk in the axial direction and further assembling it into the casing to further press the sealing disk in the axial direction and separating the seal washer from the convex portion by a predetermined amount.
【０００７】[0007]
【発明の実施の形態】本実施例におけるシール手段を備
えた伝動装置ケーシングを有する手持ち式電動工具を図
〜図４を用いて説明する。モータ１の駆動により回転す
るモータ軸２にベアリング３が圧入されており、モータ
軸２をベアリング３を介してケーシング４に固定するカ
バー５が設けられている。モータ軸２の先端にはピニオ
ン６がナット７により固定されている。ピニオン６のボ
ス部外周６ａには、シールワッシャ８とフェルト製のシ
ール円板９が設けられている。モータ軸２はケーシング
４内に貫通しており、ケーシング４内にはピニオン６と
噛み合うギヤ１０が従動軸１１に固定されており、図示
しない潤滑剤１２が充填されている。また、ケーシング
４内には、シールワッシャ８とシール円板９に対応する
保持部４ａが設けられている。BEST MODE FOR CARRYING OUT THE INVENTION A hand-held electric power tool having a transmission casing having a sealing means in this embodiment will be described with reference to FIGS. A bearing 3 is press-fitted into a motor shaft 2 that is rotated by driving the motor 1, and a cover 5 that fixes the motor shaft 2 to the casing 4 via the bearing 3 is provided. A pinion 6 is fixed to the tip of the motor shaft 2 by a nut 7. A seal washer 8 and a felt-made seal disk 9 are provided on the outer periphery 6 a of the boss portion of the pinion 6. The motor shaft 2 penetrates into the casing 4, and a gear 10 meshing with the pinion 6 is fixed to the driven shaft 11 in the casing 4 and filled with a lubricant 12 not shown. Further, in the casing 4, a holding portion 4a corresponding to the seal washer 8 and the seal disc 9 is provided.
【０００８】上記構成において、図２に示すようにモー
タ軸２にベアリング３，カバー５，ピニオン６，ナット
７，シールワッシャ８及びシール円板９を組立てた状態
でケーシング４に挿入し、カバー５をネジ１３で固定す
ると、ケーシング４の保持部４ａの側面にシールワッシ
ャ８が接触し固定されと共に、シール円板９の外周が保
持部４ａの内周に接触し、且つシールワッシャ８とベア
リング３によりシール円板９が所定量圧縮(本実施例で
は６ｍｍから３ｍｍに圧縮)されることにより、更にシ
ール円板９がピニオン６のボス部外周６ａ及び保持部４
ａの内周に密に接触し回転不能に固定される。In the above structure, as shown in FIG. 2, the bearing 3, the cover 5, the pinion 6, the nut 7, the seal washer 8 and the seal disk 9 are assembled to the motor shaft 2 and then inserted into the casing 4 to cover the cover 5 When the screw is fixed with the screw 13, the seal washer 8 contacts and is fixed to the side surface of the holding portion 4a of the casing 4, the outer circumference of the seal disc 9 contacts the inner circumference of the holding portion 4a, and the seal washer 8 and the bearing 3 The seal disk 9 is compressed by a predetermined amount (compressed from 6 mm to 3 mm in the present embodiment) by the seal disk 9, and the seal disk 9 is further compressed by the boss outer circumference 6a of the pinion 6 and the holding portion 4.
It comes into close contact with the inner periphery of a and is fixed so that it cannot rotate.
【０００９】従って、シール円板９内周とボス部外周６
ａ及びシール円板９外周と保持部４ａの内周がシールさ
れ、シール円板９を所定量圧縮し潤滑剤１２を所定量吸
収することで潤滑剤１２の透過を防止する組立て性の良
い安価なシール手段を得ることができる。Therefore, the inner circumference of the seal disk 9 and the outer circumference 6 of the boss portion
a and the outer circumference of the seal disk 9 and the inner circumference of the holding portion 4a are sealed, and the seal disk 9 is compressed by a predetermined amount and the lubricant 12 is absorbed by a predetermined amount to prevent the lubricant 12 from permeating. It is possible to obtain various sealing means.
【００１０】また、図３及び図４に示すようにピニオン
６のボス部外周６ａに凸部６ｂを設け、図４に示すよう
にモータ軸２にベアリング３，カバー５，ピニオン６，
ナット７，シールワッシャ８及びシール円板９を組立て
た状態で、凸部６ｂによりシールワッシャ８とベアリン
グ３によりシール円板９が所定量圧縮(本実施例では６
ｍｍから４．５ｍｍに圧縮)されるよう構成すると、ケ
ーシング４に挿入する際にシールワッシャ８及びシール
円板９が半径方向にずれるのを防止でき組立て性を向上
することができる。Further, as shown in FIGS. 3 and 4, a protrusion 6b is provided on the boss outer periphery 6a of the pinion 6, and as shown in FIG. 4, the motor shaft 2 is provided with a bearing 3, a cover 5, a pinion 6, and a pinion 6.
With the nut 7, the seal washer 8 and the seal disc 9 assembled, the seal washer 8 is compressed by the protrusion 6b and the seal disc 9 is compressed by the bearing 3 by a predetermined amount (6 in this embodiment).
If it is configured to be compressed from 4.5 mm to 4.5 mm, the seal washer 8 and the seal disc 9 can be prevented from being displaced in the radial direction when being inserted into the casing 4, and the assemblability can be improved.
【００１１】更にシールワッシャ８の内周とピニオン６
のボス部外周６ａのスキマをシールワッシャ８の外周と
ケーシング４の保持部４ａの内周のスキマより大きくす
ることにより、組立て時にシールワッシャ８が半径方向
にずれても、ピニオン６のボス部外周６ａに接触せず安
定したシール性を維持できる。Further, the inner periphery of the seal washer 8 and the pinion 6
By making the clearance of the outer periphery 6a of the boss portion larger than the clearance of the outer periphery of the seal washer 8 and the inner periphery of the holding portion 4a of the casing 4, even if the seal washer 8 shifts in the radial direction during assembly, the outer periphery of the boss portion of the pinion 6 A stable sealing property can be maintained without contacting 6a.
【００１２】[0012]
【発明の効果】本発明によれば、組立性に優れた安価な
シール手段を有する電動工具を提供することができる。According to the present invention, it is possible to provide an electric tool having an inexpensive sealing means which is excellent in assemblability.
【図１】 本発明における伝動装置ケーシングを有する
ディスクグラインダの一例を示す正面断面図である。FIG. 1 is a front sectional view showing an example of a disc grinder having a transmission casing according to the present invention.
【図２】 図１のモータ軸部を示す正面断面図である。2 is a front sectional view showing a motor shaft portion of FIG. 1. FIG.
【図３】 本発明における伝動装置ケーシングを有する
ディスクグラインダの一例を示す正面断面図である。FIG. 3 is a front sectional view showing an example of a disc grinder having a transmission casing according to the present invention.
【図４】 図３のモータ軸部を示す正面断面図である。FIG. 4 is a front sectional view showing a motor shaft portion of FIG.
【図５】 従来における伝動装置ケーシングを有するデ
ィスクグラインダの正面断面図である。FIG. 5 is a front sectional view of a conventional disk grinder having a transmission casing.
【図６】 図５のモータ軸部を示す正面断面図である。6 is a front sectional view showing a motor shaft portion of FIG.
２はモータ軸、３はベアリング、４はケーシング、４ａ
は保持部、５はカバー、６はピニオン、６ａはボス部外
周、６ｂは凸部，８はシールワッシャ、９はシール円板
である。2 is a motor shaft, 3 is a bearing, 4 is a casing, and 4a
Is a holding portion, 5 is a cover, 6 is a pinion, 6a is an outer periphery of a boss portion, 6b is a convex portion, 8 is a seal washer, and 9 is a sealing disc.
Claims (3)
それぞれの該軸の支持部にベアリング及び低粘度の潤滑
剤が外部へ流出しないためのシール手段とが配される電
動工具おいて、前記軸または前記軸に固定された部材に
フェルトなどの低粘度の潤滑剤を吸収放出可能な材料か
らなるシール円板とシールワッシャとを設け、前記軸を
ケーシングに組立ることにより前記シール円板の内周が
前記軸または前記軸に固定された部材と密接し、且つ前
記シール円板の外周が前記ケーシングの支持部外周に密
接し、更に前記シール円板が回転不能となるように前記
シールワッシャと前記ベアリングとにより所定量軸方向
に押圧されることを特徴とする電動工具。1. A drive shaft and a driven shaft that rotate at high speed,
In an electric tool in which a bearing and a sealing means for preventing low-viscosity lubricant from leaking to the outside are arranged on the support portions of the respective shafts, a low-viscosity felt such as felt is attached to the shaft or a member fixed to the shaft. By providing a seal disk made of a material capable of absorbing and releasing the lubricant and a seal washer, and assembling the shaft into a casing, the inner circumference of the seal disk is in close contact with the shaft or a member fixed to the shaft. In addition, the outer periphery of the seal disc is in close contact with the outer periphery of the support portion of the casing, and further, the seal washer and the bearing are pressed by a predetermined amount in the axial direction so that the seal disc cannot rotate. Characteristic power tool.
凸部を設け、前記軸または前記軸に固定された部材に前
記シールワッシャと前記シール円板と前記ベアリングを
組立てた状態で前記凸部により前記シールワッシャを介
して前記シール円板が軸方向に押圧され、前記ケーシン
グに組立てることにより更に前記シール円板が軸方向に
押圧され、前記シールワッシャが前記凸部から所定量離
れるよう構成したことを特徴とする請求項１記載の電動
工具。2. The convex portion is provided on the shaft or a member fixed to the shaft, and the convex portion is formed by assembling the seal washer, the seal disk, and the bearing on the shaft or the member fixed to the shaft. The seal disc is axially pressed by the portion via the seal washer, and the seal disc is further pressed in the axial direction by being assembled to the casing, and the seal washer is separated from the convex portion by a predetermined amount. The electric power tool according to claim 1, wherein
軸に固定された部材とのスキマを前記シールワッシャと
前記ケーシングの保持部外周とのスキマより大きく構成
したことを特徴とする請求項１または請求項２の何れか
記載の電動工具。3. The gap between the seal washer and the shaft or a member fixed to the shaft is larger than the gap between the seal washer and the outer periphery of the holding portion of the casing. Item 3. The power tool according to any one of items 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001334501A JP3855735B2 (en) | 2001-10-31 | 2001-10-31 | Electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001334501A JP3855735B2 (en) | 2001-10-31 | 2001-10-31 | Electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003136435A true JP2003136435A (en) | 2003-05-14 |
| JP3855735B2 JP3855735B2 (en) | 2006-12-13 |
Family
ID=19149617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001334501A Expired - Fee Related JP3855735B2 (en) | 2001-10-31 | 2001-10-31 | Electric tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3855735B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7398800B2 (en) | 2005-01-13 | 2008-07-15 | Max Co., Ltd. | Reinforcing bar binding machine |
| JP2014124727A (en) * | 2012-12-27 | 2014-07-07 | Ryobi Ltd | Working tool |
-
2001
- 2001-10-31 JP JP2001334501A patent/JP3855735B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7398800B2 (en) | 2005-01-13 | 2008-07-15 | Max Co., Ltd. | Reinforcing bar binding machine |
| JP2014124727A (en) * | 2012-12-27 | 2014-07-07 | Ryobi Ltd | Working tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3855735B2 (en) | 2006-12-13 |
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