JP4516418B2 - motor - Google Patents

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JP4516418B2
JP4516418B2 JP2004362881A JP2004362881A JP4516418B2 JP 4516418 B2 JP4516418 B2 JP 4516418B2 JP 2004362881 A JP2004362881 A JP 2004362881A JP 2004362881 A JP2004362881 A JP 2004362881A JP 4516418 B2 JP4516418 B2 JP 4516418B2
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washer
commutator
peripheral surface
bearing
oil
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JP2006174587A (en
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研二 小林
一昭 辻田
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Asmo Co Ltd
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Asmo Co Ltd
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Description

本発明はモータに係り、詳しくはモータの回転軸を支持する軸受に含浸された潤滑油の飛散を防止する油飛散防止用ワッシャに関する。   The present invention relates to a motor, and more particularly, to an oil splattering washer that prevents scattering of lubricating oil impregnated in a bearing that supports a rotating shaft of the motor.

従来、特許文献１にて開示されているように、有底筒状のヨークハウジングと該ヨークハウジングの開口部を閉塞するエンドハウジングとから構成されたモータハウジングの軸方向両端部には、該モータハウジングの内部に収容されたロータの回転軸を回転可能に支持する軸受が設けられている。この軸受は潤滑油を有しており、軸受と回転軸との摺動部に潤滑油が入り込むことにより、回転軸の回転が良好に維持されている。   Conventionally, as disclosed in Patent Document 1, the motor housing composed of a bottomed cylindrical yoke housing and an end housing that closes the opening of the yoke housing is provided at both ends in the axial direction of the motor housing. A bearing is provided for rotatably supporting a rotating shaft of a rotor housed in the housing. This bearing has lubricating oil, and the rotation of the rotating shaft is well maintained by the lubricating oil entering the sliding portion between the bearing and the rotating shaft.

また、この種のモータには、軸受の潤滑油がコア及び整流子に付着することを防止するために、軸受とコアとの間（モータによっては軸受と整流子との間）に油飛散防止用ワッシャが設けられている。この油飛散防止用ワッシャとしては、例えば特許文献２にて開示されているものがある。特許文献２にて開示されている油飛散防止ワッシャは、略円板状をなしており、その径方向中央部に嵌入孔が形成されている。この嵌入孔に回転軸が圧入されることにより、油飛散防止ワッシャは回転軸に対して固定される。
特開平８−９８４４９号公報 特開平５−４９２０３号公報 Also, in this type of motor, in order to prevent the lubricating oil of the bearing from adhering to the core and the commutator, oil scattering is prevented between the bearing and the core (between the bearing and the commutator depending on the motor). Washers are provided. As this oil scattering prevention washer, there is one disclosed in Patent Document 2, for example. The oil scattering prevention washer disclosed in Patent Document 2 has a substantially disk shape, and an insertion hole is formed in the central portion in the radial direction. The oil scattering prevention washer is fixed to the rotating shaft by press-fitting the rotating shaft into the fitting hole.
JP-A-8-98449 JP-A-5-49203

しかしながら、特許文献２にて開示されているような油飛散防止用ワッシャは、回転軸に対して圧入固定されたとしても、油飛散防止用ワッシャの内周面（嵌入孔の内周面）と回転軸の外周面との間に毛細管現象によって軸受の潤滑油が浸入してしまう。そして、油飛散防止用ワッシャの内周面と回転軸の外周面との間に浸入した潤滑油は、油飛散防止用ワッシャの軸受側からコア及び整流子側に到達し、コアや整流子に付着してしまうという問題があった。例えば、潤滑油が整流子に付着すると、該整流子に摺接される給電用ブラシが異常摩耗する虞がある。また、異常摩耗したブラシの粉が整流子を構成する整流子片間に堆積すると、隣接する整流子片同士がショートしてしまう虞がある。   However, even if the oil scattering prevention washer disclosed in Patent Document 2 is press-fitted and fixed to the rotating shaft, the oil scattering prevention washer has an inner peripheral surface (an inner peripheral surface of the insertion hole) and Lubricating oil of the bearing infiltrates between the outer peripheral surface of the rotating shaft and capillary action. The lubricating oil that has entered between the inner peripheral surface of the oil splatter washer and the outer peripheral surface of the rotating shaft reaches the core and commutator side from the bearing side of the oil splatter washer, and reaches the core and commutator. There was a problem of adhering. For example, when lubricating oil adheres to the commutator, the power supply brush that is in sliding contact with the commutator may be abnormally worn. In addition, if the abnormally worn brush powder accumulates between the commutator pieces constituting the commutator, adjacent commutator pieces may be short-circuited.

本発明は、こうした実情に鑑みてなされたものであって、その目的は、軸受の潤滑油が整流子やコアに付着することを抑制することができるモータを提供することにある。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a motor that can suppress adhesion of lubricating oil of a bearing to a commutator and a core.

上記課題を解決するため、請求項１に記載の発明は、モータハウジングに設けられ潤滑油が含浸された軸受と、巻線が巻回されたコアが固定され、前記軸受によって回転可能に支持された回転軸と、前記回転軸に固定される支持部材を備えるとともに、該支持部材の外周面に配設され給電用ブラシが摺接される複数の整流子片を備えた整流子と、前記整流子と前記軸受との間に介在され前記回転軸と一体回転する油飛散防止用ワッシャとを備えたモータであって、前記油飛散防止用ワッシャは、径方向中央部に前記回転軸の外径より大きい内径を有する貫通孔を備えるとともに、前記整流子の径方向外側から複数の前記整流子片に当接して複数の前記整流子片を前記支持部材に固定する固定部を備えたワッシャ本体と、前記ワッシャ本体の径方向内側であって前記貫通孔の内周面側に形成され、前記回転軸が圧入される圧入孔を備え前記回転軸の外周面に対して密着する環状の内環部とを備え、合成樹脂よりなる前記ワッシャ本体とエラストマよりなる前記内環部とが二色成形により一体に形成されている。 To solve the above problems, a first aspect of the present invention, a bearing lubricating oil provided in the motor housing is impregnated core the windings is wound is fixed, rotatably supported by said bearings A commutator including a rotating shaft and a support member fixed to the rotating shaft, and a plurality of commutator pieces disposed on the outer peripheral surface of the support member and in contact with the power feeding brush; An oil scattering prevention washer interposed between the commutator and the bearing and rotating integrally with the rotating shaft, wherein the oil scattering preventing washer is arranged at a central portion in the radial direction of the rotating shaft. A washer having a through hole having an inner diameter larger than the outer diameter, and a fixing portion that contacts the plurality of commutator pieces from the radially outer side of the commutator and fixes the plurality of commutator pieces to the support member. a body, the diameter of the washer body It is formed on the inner peripheral surface side of the through hole a direction inwardly, and an inner annular portion of the annular said rotary shaft seals against the outer peripheral surface of the rotary shaft comprises a press-fitting hole to be press-fitted, synthetic resin The washer main body and the inner ring portion made of elastomer are integrally formed by two-color molding .

（作用）
請求項１に記載の発明によれば、油飛散防止用ワッシャが備える環状（筒状を含む）の内環部が回転軸の外周面に対して密着するため、軸受から滲み出た潤滑油は、内環部の内周面と回転軸の外周面との間に浸入し難い。従って、軸受から滲み出た潤滑油が、内環部の内周面と回転軸の外周面との間を通って油飛散防止用ワッシャの軸受側から反軸受側に到達することが防止される。その結果、回転軸において油飛散防止用ワッシャの反軸受側に固定されたコアや整流子に軸受の潤滑油が付着することを抑制することができる。 (Function)
According to the first aspect of the present invention, since the annular (including cylindrical) inner ring portion of the washer for preventing oil scattering comes into close contact with the outer peripheral surface of the rotating shaft, the lubricating oil that has oozed out of the bearing is It is difficult to enter between the inner peripheral surface of the inner ring part and the outer peripheral surface of the rotating shaft. Accordingly, the lubricating oil that has oozed out of the bearing is prevented from passing from the bearing side of the oil scattering prevention washer to the anti-bearing side through between the inner circumferential surface of the inner ring portion and the outer circumferential surface of the rotating shaft. . As a result, the lubricating oil of the bearing can be prevented from adhering to the core and the commutator fixed to the anti-bearing side of the oil scattering preventing washer on the rotating shaft.

また、エラストマ（弾性材料）にて形成された内環部の内周面は、回転軸の外周面と密着し易い。従って、軸受から滲み出た潤滑油は、内環部の内周面と回転軸の外周面との間に浸入し難い。また、内環部がエラストマにて形成されると、回転軸の油飛散防止用ワッシャへの圧入が容易となる。更に、内環部がエラストマにて形成されると、油飛散防止用ワッシャの寸法管理（内径の寸法管理）が容易となる。 Moreover , the inner peripheral surface of the inner ring portion formed of an elastomer ( elastic material ) is likely to be in close contact with the outer peripheral surface of the rotating shaft. Therefore, the lubricating oil that has oozed out of the bearing is unlikely to enter between the inner peripheral surface of the inner ring portion and the outer peripheral surface of the rotary shaft. In addition, when the inner ring portion is formed of an elastomer, it is easy to press-fit the rotating shaft into the oil scattering prevention washer. Further, when the inner ring portion is formed of an elastomer , the size management (size management of the inner diameter) of the oil scattering prevention washer is facilitated.

また、内環部がエラストマよりなるため、回転軸の外周面に対する内環部の内周面の密着度が更に増し、軸受から滲み出た潤滑油は、内環部の内周面と回転軸の外周面との間に更に浸入し難くなる。また、内環部をエラストマにて形成すると、油飛散防止用ワッシャを製造する際、内環部を二色成形にて形成することが容易となる。 The inner since the ring portion is made of an elastomer, increasing the degree of adhesion of the inner circumferential surface of the inner ring portion with respect to the outer peripheral surface of the rotating shaft is further lubricating oil oozed from the bearing, the rotary shaft and the inner peripheral surface of the inner ring portion It becomes more difficult to infiltrate between the outer peripheral surfaces of the two. In addition, when the inner ring portion is formed of an elastomer, it is easy to form the inner ring portion by two-color molding when manufacturing an oil scattering prevention washer.

また、油飛散防止用ワッシャ（ワッシャ本体）が備える固定部によって、整流子片は支持部材に対してより安定して固定される。また、給電用ブラシが整流子片に摺接することによって整流子で振動が発生しても、その振動は固定部を介して内環部に伝達され、エラストマ（弾性材料）にて形成された内環部にて減衰される。 Further , the commutator piece is more stably fixed to the support member by the fixing portion provided in the oil scattering prevention washer (washer body) . Further, even if vibration occurs in the commutator due to the power supply brush sliding on the commutator piece, the vibration is transmitted to the inner ring portion via the fixed portion, and is formed by an elastomer ( elastic material ) . Damped at the ring.

本発明によれば、軸受の潤滑油が整流子やコアに付着することが抑制されるモータを提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the motor by which the lubricating oil of a bearing is suppressed from adhering to a commutator or a core can be provided.

（第１実施形態）
以下、本発明を具体化した第１実施形態を図１及び図２に従って説明する。
図１に示すように、モータ１は、固定子２と電機子（回転子）３とを備えている。固定子２は、有底筒状のヨークハウジング４と、該ヨークハウジング４の内周面に固着された複数の永久磁石５とを備えている。ヨークハウジング４の開口端は、エンドハウジング６によって閉塞されている。このエンドハウジング６とヨークハウジング４とからモータハウジング７が構成されている。 (First embodiment)
A first embodiment embodying the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the motor 1 includes a stator 2 and an armature (rotor) 3. The stator 2 includes a bottomed cylindrical yoke housing 4 and a plurality of permanent magnets 5 fixed to the inner peripheral surface of the yoke housing 4. The open end of the yoke housing 4 is closed by an end housing 6. The end housing 6 and the yoke housing 4 constitute a motor housing 7.

電機子３は、回転軸１１と、該回転軸１１に固定され巻線１２が巻回されたコア１３と、同回転軸１１に固定された整流子１４とから構成されている。
回転軸１１の両端側は、ヨークハウジング４の底部４ａの中央に固定された軸受１５と、エンドハウジング６の中央に固定された軸受１６とによって回転可能に支持されている。軸受１５，１６は略円筒状をなしており、潤滑油が含浸されている。これらの軸受１５，１６に回転軸１１の両端側が挿入され、軸受１５，１６の内周面と該内周面と摺接する回転軸１１の外周面１１ａとの間に潤滑油が入り込むことにより、回転軸１１の回転が良好に維持されている。尚、回転軸１１は、コア１３が前記永久磁石５と径方向に対向する位置に配置されると共に、エンドハウジング６側に整流子１４が配置されるように軸受１５，１６に支持されている。また、回転軸１１が軸受１５，１６に支持された状態では、回転軸１１の先端部（図１中、右側）がヨークハウジング４の底部４ａから外部に突出している。 The armature 3 includes a rotary shaft 11, a core 13 fixed to the rotary shaft 11 and wound with a winding 12, and a commutator 14 fixed to the rotary shaft 11.
Both end sides of the rotating shaft 11 are rotatably supported by a bearing 15 fixed at the center of the bottom portion 4 a of the yoke housing 4 and a bearing 16 fixed at the center of the end housing 6. The bearings 15 and 16 have a substantially cylindrical shape and are impregnated with lubricating oil. Both ends of the rotary shaft 11 are inserted into these bearings 15 and 16, and the lubricating oil enters between the inner peripheral surface of the bearings 15 and 16 and the outer peripheral surface 11a of the rotary shaft 11 in sliding contact with the inner peripheral surface. The rotation of the rotating shaft 11 is maintained well. The rotary shaft 11 is supported by bearings 15 and 16 so that the core 13 is disposed at a position facing the permanent magnet 5 in the radial direction and the commutator 14 is disposed on the end housing 6 side. . Further, in a state where the rotating shaft 11 is supported by the bearings 15 and 16, the tip end portion (right side in FIG. 1) of the rotating shaft 11 protrudes from the bottom portion 4 a of the yoke housing 4.

図２に示すように、前記整流子１４は、合成樹脂よりなる支持部材２１と、複数の整流子片２２とを備えている。支持部材２１は、円筒状の支持部材本体２３と、該支持部材本体２３の軸受１６側の端面２３ａから突設され支持部材本体２３より小さい外径を有する円筒状の縮径部２４とから構成されている。この支持部材２１は、径方向中央部に設けられた固定孔２５に回転軸１１が圧入されることにより、回転軸１１に対して固定されている。   As shown in FIG. 2, the commutator 14 includes a support member 21 made of a synthetic resin and a plurality of commutator pieces 22. The support member 21 includes a cylindrical support member main body 23 and a cylindrical reduced diameter portion 24 that protrudes from the end surface 23 a on the bearing 16 side of the support member main body 23 and has an outer diameter smaller than that of the support member main body 23. Has been. The support member 21 is fixed with respect to the rotation shaft 11 by press-fitting the rotation shaft 11 into a fixing hole 25 provided at a central portion in the radial direction.

支持部材本体２３の外周面には、複数の前記整流子片２２が周方向に並んで固着されている。詳しくは、各整流子片２２は、その軸受１６側（反コア１３側）の端部が、支持部材本体２３の軸受１６側の端面２３ａよりも縮径部２４側に突出するようにして支持部材本体２３の外周面に固着されている。また、各整流子片２２は、周方向に隣接する整流子片２２間に間隙を有して支持部材本体２３の外周面に固着されている。   A plurality of commutator pieces 22 are fixed to the outer peripheral surface of the support member main body 23 side by side in the circumferential direction. Specifically, each commutator piece 22 is supported such that the end portion on the bearing 16 side (anti-core 13 side) protrudes toward the reduced diameter portion 24 side from the end surface 23a on the bearing 16 side of the support member body 23. The member body 23 is fixed to the outer peripheral surface. Each commutator piece 22 is fixed to the outer peripheral surface of the support member main body 23 with a gap between the commutator pieces 22 adjacent in the circumferential direction.

図１に示すように、これらの整流子片２２には給電用ブラシ２７が摺接される。この給電用ブラシ２７は、エンドハウジング６に保持されると共に、図示しない給電用ターミナルに接続されている。そして、給電用ターミナルから給電用ブラシ２７及び整流子１４を介して電機子３に電流が供給されると、電機子３に回転磁界が発生し、電機子３が回転する。   As shown in FIG. 1, a power supply brush 27 is slidably contacted with these commutator pieces 22. The power supply brush 27 is held by the end housing 6 and is connected to a power supply terminal (not shown). When a current is supplied from the power supply terminal to the armature 3 via the power supply brush 27 and the commutator 14, a rotating magnetic field is generated in the armature 3 and the armature 3 rotates.

前記軸受１６と整流子１４との間には、油飛散防止用ワッシャ３１が介在されている。図２に示すように、この油飛散防止用ワッシャ３１は、ワッシャ本体３２と、該ワッシャ本体３２の径方向内側に備えられた内環部３３とから構成されている。   Between the bearing 16 and the commutator 14, an oil scattering preventing washer 31 is interposed. As shown in FIG. 2, the oil scattering preventing washer 31 includes a washer body 32 and an inner ring portion 33 provided on the radially inner side of the washer body 32.

ワッシャ本体３２は、略円環状をなしており、合成樹脂（例えば、ＰＡ（ポリアミド樹脂）やナイロン系の合成樹脂等）よりなる。ワッシャ本体３２の外径は、軸受１６の外径よりも小さく形成されている。また、ワッシャ本体３２の整流子１４側の端部は、軸方向に沿って整流子１４側に向かうに連れて徐々に縮径したテーパ状をなしている。更に、ワッシャ本体３２の軸受１６側の端部は、軸方向に沿って軸受１６に向かうに連れて徐々に縮径したテーパ状をなしている。   The washer body 32 has a substantially annular shape and is made of a synthetic resin (for example, PA (polyamide resin), nylon-based synthetic resin, or the like). The outer diameter of the washer body 32 is formed smaller than the outer diameter of the bearing 16. Further, the end of the washer body 32 on the side of the commutator 14 has a tapered shape with a diameter gradually reduced toward the commutator 14 side along the axial direction. Further, the end of the washer body 32 on the bearing 16 side has a tapered shape with a diameter gradually reduced toward the bearing 16 along the axial direction.

ワッシャ本体３２の整流子１４側の端面３２ａには、その径方向中央部に固定凹部３４が凹設されている。ワッシャ本体３２において、固定凹部３４の側壁を構成する円環状の部分が固定部３５となっている。固定部３５の軸方向の長さは、縮径部２４の軸方向の長さと等しいかそれより若干長く形成されている。また、固定部３５の内径（固定凹部３４の内径）は、整流子１４の外径と等しく形成されている。そして、油飛散防止用ワッシャ３１は、固定凹部３４の底面３４ａに縮径部２４の先端面２４ａが当接するように回転軸１１に対して固定されており、これによって整流子片２２の縮径部２４側に突出した部分が固定凹部３４内に収容される。同時に、固定部３５の内周面３５ａが整流子片２２の径方向外側の面２２ａに当接し、固定部３５は整流子片２２を支持部材２１に対して固定する。   A fixed recess 34 is formed in the radial center of the end surface 32a of the washer body 32 on the commutator 14 side. In the washer main body 32, an annular portion constituting the side wall of the fixed recess 34 is a fixed portion 35. The axial length of the fixed portion 35 is formed to be equal to or slightly longer than the axial length of the reduced diameter portion 24. Further, the inner diameter of the fixed portion 35 (the inner diameter of the fixed recess 34) is formed to be equal to the outer diameter of the commutator 14. The oil splatter prevention washer 31 is fixed to the rotary shaft 11 so that the tip surface 24a of the reduced diameter portion 24 abuts the bottom surface 34a of the fixed recess 34, thereby reducing the diameter of the commutator piece 22. A portion protruding toward the portion 24 is accommodated in the fixed recess 34. At the same time, the inner peripheral surface 35 a of the fixing portion 35 comes into contact with the radially outer surface 22 a of the commutator piece 22, and the fixing portion 35 fixes the commutator piece 22 to the support member 21.

一方、ワッシャ本体３２の軸受１６側の端面３２ｂは軸受１６に当接しており、この端面３２ｂの径方向中央部には油だまり部３６が凹設されている。油だまり部３６の内径は、回転軸１１の外径よりも大きく形成されている。   On the other hand, the end surface 32b of the washer body 32 on the bearing 16 side is in contact with the bearing 16, and an oil sump portion 36 is recessed at the radial center of the end surface 32b. The inner diameter of the oil sump 36 is formed larger than the outer diameter of the rotating shaft 11.

また、ワッシャ本体３２には、固定凹部３４の底面３４ａから油だまり部３６の底面３６ａまで貫通した貫通孔３７が形成されている。貫通孔３７の内径は、回転軸１１の外径よりも大きく形成されている。   Further, the washer body 32 is formed with a through hole 37 penetrating from the bottom surface 34 a of the fixed recess 34 to the bottom surface 36 a of the oil sump portion 36. The inner diameter of the through hole 37 is formed larger than the outer diameter of the rotating shaft 11.

前記内環部３３は、円環状をなしており、貫通孔３７の内周面に形成されている。内環部３３の軸方向の幅は、貫通孔３７の軸方向の幅と等しく形成されている。また、内環部３３の径方向中央部に備えられた圧入孔３９の内径は、回転軸１１の外径よりも小さく形成されている。このような内環部３３は、弾性材料としてのエラストマよりなり、ワッシャ本体３２の貫通孔３７の内周面に一体に成形されている。本実施形態では、内環部３３とワッシャ本体３２とは二色成形により一体に成形されている。そして、油飛散防止用ワッシャ３１は、内環部３３の圧入孔３９に回転軸１１が圧入されることにより、回転軸１１に対して固定されている。   The inner ring portion 33 has an annular shape and is formed on the inner peripheral surface of the through hole 37. The width of the inner ring portion 33 in the axial direction is formed to be equal to the width of the through hole 37 in the axial direction. Further, the inner diameter of the press-fitting hole 39 provided at the radial center portion of the inner ring portion 33 is formed smaller than the outer diameter of the rotating shaft 11. Such an inner ring portion 33 is made of an elastomer as an elastic material, and is integrally formed on the inner peripheral surface of the through hole 37 of the washer body 32. In the present embodiment, the inner ring portion 33 and the washer body 32 are integrally formed by two-color molding. The oil scattering preventing washer 31 is fixed to the rotating shaft 11 by press-fitting the rotating shaft 11 into the press-fitting hole 39 of the inner ring portion 33.

上記のように構成されたモータ１では、油飛散防止用ワッシャ３１において、回転軸１１が圧入される内環部３３は、エラストマにて形成されている。そのため、内環部３３の内周面３３ａは、従来の油飛散防止ワッシャの内周面よりも回転軸１１の外周面１１ａに密着する。従って、軸受１６から滲み出た潤滑油が、内環部３３の内周面３３ａと回転軸１１の外周面１１ａとの間を通って、油飛散防止用ワッシャ３１の軸受１６側から整流子１４側に到達することが防止される。   In the motor 1 configured as described above, in the oil scattering prevention washer 31, the inner ring portion 33 into which the rotary shaft 11 is press-fitted is formed of an elastomer. Therefore, the inner peripheral surface 33a of the inner ring portion 33 is more closely attached to the outer peripheral surface 11a of the rotary shaft 11 than the inner peripheral surface of the conventional oil scattering prevention washer. Therefore, the lubricating oil that has oozed out of the bearing 16 passes between the inner peripheral surface 33a of the inner ring portion 33 and the outer peripheral surface 11a of the rotating shaft 11, and from the bearing 16 side of the oil scattering preventing washer 31 to the commutator 14. Reaching the side is prevented.

上記したように、本実施形態によれば、以下の効果を有する。
（１）油飛散防止用ワッシャ３１が備える内環部３３はエラストマよりなるため、その内周面３３ａが回転軸１１の外周面に密着する。そのため、軸受１６から滲み出た潤滑油は、内環部３３の内周面３３ａと回転軸１１の外周面との間に浸入し難い。従って、軸受１６から滲み出た潤滑油が、内環部３３の内周面３３ａと回転軸１１の外周面１１ａとの間を通って油飛散防止用ワッシャ３１の軸受１６側から整流子１４側に到達することが防止される。その結果、回転軸１１において油飛散防止用ワッシャ３１の反軸受１６側に固定されたコア１３や整流子１４に軸受１６の潤滑油が付着することを抑制することができる。 As described above, the present embodiment has the following effects.
(1) Since the inner ring portion 33 provided in the oil scattering preventing washer 31 is made of an elastomer, the inner peripheral surface 33 a thereof is in close contact with the outer peripheral surface of the rotating shaft 11. Therefore, the lubricating oil that has oozed out from the bearing 16 is unlikely to enter between the inner peripheral surface 33 a of the inner ring portion 33 and the outer peripheral surface of the rotary shaft 11. Accordingly, the lubricating oil that has oozed out of the bearing 16 passes between the inner peripheral surface 33a of the inner ring portion 33 and the outer peripheral surface 11a of the rotary shaft 11 from the bearing 16 side of the oil scattering prevention washer 31 to the commutator 14 side. Reaching is prevented. As a result, it is possible to suppress the lubricant of the bearing 16 from adhering to the core 13 and the commutator 14 that are fixed to the anti-bearing 16 side of the oil scattering preventing washer 31 in the rotating shaft 11.

（２）内環部３３は弾性材料（エラストマ）にて形成されているため、回転軸１１の内環部３３の圧入孔３９への圧入が容易となる。更に、内環部３３が弾性材料にて形成されているため、油飛散防止用ワッシャ３１の寸法管理（内径の寸法管理）が容易となる。よって、油飛散防止用ワッシャ３１を備えたモータ１の製造コストの増大を抑えることができる。   (2) Since the inner ring portion 33 is formed of an elastic material (elastomer), it is easy to press-fit the inner ring portion 33 of the rotary shaft 11 into the press-fitting hole 39. Furthermore, since the inner ring portion 33 is formed of an elastic material, the size management (size management of the inner diameter) of the oil scattering prevention washer 31 is facilitated. Therefore, it is possible to suppress an increase in manufacturing cost of the motor 1 provided with the oil scattering preventing washer 31.

（３）内環部３３は、弾性材料としてのエラストマにて形成されているため、回転軸１１と内環部３３との間のしめしろをより大きく設定することができる。従って、しめしろをより大きく設定すると、内環部３３の内周面３３ａと回転軸１１の外周面１１ａとをより密着させることができ、内環部３３の内周面３３ａと回転軸１１の外周面１１ａとの間に軸受１６の潤滑油が浸入することをより防止することができる。   (3) Since the inner ring portion 33 is formed of an elastomer as an elastic material, the interference between the rotating shaft 11 and the inner ring portion 33 can be set larger. Therefore, when the interference is set larger, the inner peripheral surface 33a of the inner ring portion 33 and the outer peripheral surface 11a of the rotary shaft 11 can be brought into close contact with each other. It is possible to further prevent the lubricating oil of the bearing 16 from entering between the outer peripheral surface 11a.

（４）内環部３３はエラストマよりなるため、ワッシャ本体３２と内環部３３との二色成形を容易に行うことができる。また、ワッシャ本体３２と内環部３３とは二色成形により一体成形されているため、油飛散防止用ワッシャ３１の組付けを容易に行うことができる。その結果、モータ１の製造コストの増大をより抑えることができる。   (4) Since the inner ring portion 33 is made of an elastomer, two-color molding of the washer body 32 and the inner ring portion 33 can be easily performed. Further, since the washer body 32 and the inner ring portion 33 are integrally formed by two-color molding, the oil scattering prevention washer 31 can be easily assembled. As a result, an increase in manufacturing cost of the motor 1 can be further suppressed.

（５）油飛散防止用ワッシャ３１が備える固定部３５によって、整流子１４は、例えば接着剤のみで固定された場合よりも、より安定して支持部材２１に対して固定される。また、給電用ブラシ２７が整流子片２２に摺接することによって整流子１４で振動が発生しても、その振動は固定部３５を介して内環部３３に伝達され、弾性材料（本実施形態ではエラストマ）にて形成された内環部３３にて減衰される。従って、整流子１４が振動しても、その振動は回転軸１１に伝達され難い。その結果、モータ１の振動を抑制することができる。   (5) The commutator 14 is more stably fixed to the support member 21 than the case where the commutator 14 is fixed only by an adhesive, for example, by the fixing portion 35 provided in the oil splattering washer 31. Further, even when vibration is generated in the commutator 14 by the sliding contact of the power supply brush 27 with the commutator piece 22, the vibration is transmitted to the inner ring portion 33 through the fixing portion 35, and an elastic material (this embodiment) Is attenuated by the inner ring portion 33 formed of elastomer. Therefore, even if the commutator 14 vibrates, the vibration is hardly transmitted to the rotating shaft 11. As a result, vibration of the motor 1 can be suppressed.

（第２実施形態）
以下、本発明を具体化した第２実施形態を図３（ａ）（ｂ）に従って説明する。尚、上記第１実施形態と同一の構成については同一の符号を付してその説明を省略する。 (Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. In addition, about the structure same as the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

本第２実施形態のモータは、上記第１実施形態のモータ１に備えられた油飛散防止用ワッシャ３１に代えて、図３（ａ）に示す油飛散防止用ワッシャ４１を備えて構成されている。   The motor of the second embodiment is configured to include an oil scattering prevention washer 41 shown in FIG. 3A in place of the oil scattering prevention washer 31 provided in the motor 1 of the first embodiment. Yes.

図３（ｂ）に示すように、油飛散防止用ワッシャ４１は略円環状をなしており、合成樹脂（例えば、ＰＡ（ポリアミド樹脂）やナイロン系の合成樹脂等）よりなる。油飛散防止用ワッシャ４１の外径は、軸受１６（図１参照）の外径よりも小さく形成されている。また、油飛散防止用ワッシャ４１の整流子１４側の端部は、軸方向に沿って整流子１４側に向かうに連れて徐々に縮径したテーパ状をなしている。更に、油飛散防止用ワッシャ４１の軸受１６側の端部は、軸方向に沿って軸受１６に向かうに連れて徐々に縮径したテーパ状をなしている。   As shown in FIG. 3B, the oil scattering preventing washer 41 has a substantially annular shape and is made of a synthetic resin (for example, PA (polyamide resin), nylon-based synthetic resin, or the like). The outer diameter of the oil scattering preventing washer 41 is smaller than the outer diameter of the bearing 16 (see FIG. 1). Further, the end portion on the commutator 14 side of the oil scattering prevention washer 41 has a tapered shape with a diameter gradually reduced toward the commutator 14 side along the axial direction. Further, the end portion of the oil scattering prevention washer 41 on the bearing 16 side has a tapered shape with a diameter gradually reduced toward the bearing 16 along the axial direction.

油飛散防止用ワッシャ４１の整流子１４側の端面４１ａには、固定凹部３４が凹設されている。油飛散防止用ワッシャ４１は、固定凹部３４の底面３４ａに縮径部２４の先端面２４ａが当接するように回転軸１１に対して固定されている。一方、油飛散防止用ワッシャ４１の軸受１６側の端面４１ｂには、油だまり部３６が凹設されている。   A fixed recess 34 is formed in the end face 41a on the commutator 14 side of the oil scattering preventing washer 41. The oil splatter prevention washer 41 is fixed to the rotary shaft 11 so that the tip surface 24a of the reduced diameter portion 24 abuts the bottom surface 34a of the fixed recess 34. On the other hand, an oil sump portion 36 is recessed in the end face 41 b of the oil scattering prevention washer 41 on the bearing 16 side.

また、図３（ａ）に示すように、油飛散防止用ワッシャ４１には、固定凹部３４の底面３４ａから油だまり部３６の底面３６ａまで貫通した嵌入孔４２が形成されている。嵌入孔４２の内径は、回転軸１１の外径よりも若干小さく形成されている。   Further, as shown in FIG. 3A, the oil scattering prevention washer 41 is formed with a fitting hole 42 penetrating from the bottom surface 34 a of the fixed recess 34 to the bottom surface 36 a of the oil reservoir 36. The inner diameter of the fitting hole 42 is formed slightly smaller than the outer diameter of the rotating shaft 11.

嵌入孔４２の油だまり部３６側の端部４２ａには、該端部４２ａから嵌入孔４２と連通するように密着筒部４３（密着部）が延設されている。この密着筒部４３は、嵌入孔４２の端部４２ａから、軸方向に沿って（嵌入孔４２の軸線と密着筒部４３の軸線とが一致するように）延設されている。密着筒部４３は、基端から先端に向かうに連れて徐々に縮径された筒状をなしており、その先端部は、油飛散防止用ワッシャ４１の油だまり部３６側の端面４１ｂよりも軸受１６側に突出している（図３（ｂ）参照）。そして、密着筒部４３の内周面により形成された圧入孔４４の内径は、密着筒部４３の基端から先端に向かうに連れて徐々に小さくなっている。また、密着筒部４３の基端部における圧入孔４４の内径は、嵌入孔４２の内径と等しく形成されている。密着筒部４３の径方向の厚さは、油飛散防止用ワッシャ４１において嵌入孔４２が形成されている部分の径方向の厚さよりも薄く形成されている。このような密着筒部４３は弾性変形可能であり、油飛散防止用ワッシャ４１は、嵌入孔４２及び圧入孔４４に回転軸１１が圧入されることにより、回転軸１１に対して固定されている。   A close-contact cylinder portion 43 (a close-contact portion) extends from the end portion 42a of the insertion hole 42 on the oil pool portion 36 side so as to communicate with the insertion hole 42 from the end portion 42a. The close contact cylinder portion 43 extends from the end portion 42 a of the insertion hole 42 along the axial direction (so that the axis line of the insertion hole 42 and the axis line of the close contact cylinder portion 43 coincide with each other). The close-contact cylinder portion 43 has a cylindrical shape that is gradually reduced in diameter from the proximal end toward the distal end, and the distal end portion is more than the end surface 41b on the oil sump portion 36 side of the oil scattering prevention washer 41. It protrudes to the bearing 16 side (see FIG. 3B). The inner diameter of the press-fitting hole 44 formed by the inner peripheral surface of the close-contact cylinder portion 43 is gradually reduced from the proximal end to the distal end of the close-contact cylinder portion 43. Further, the inner diameter of the press-fitting hole 44 at the proximal end portion of the close-contact cylinder portion 43 is formed to be equal to the inner diameter of the fitting hole 42. The thickness in the radial direction of the contact cylinder portion 43 is formed to be thinner than the thickness in the radial direction of the portion where the insertion hole 42 is formed in the oil scattering prevention washer 41. The close contact cylinder portion 43 can be elastically deformed, and the oil scattering prevention washer 41 is fixed to the rotation shaft 11 by press-fitting the rotation shaft 11 into the fitting hole 42 and the press-fitting hole 44. .

上記のように構成されたモータにおいて、油飛散防止用ワッシャ４１が備える密着筒部４３は、基端から先端に向かうにつれて徐々に縮径されており、その内径（圧入孔４４の内径）は、密着筒部４３の基端においては嵌入孔４２の直径と等しいが、先端に向かうに連れて徐々に小さくなっている。そのため、密着筒部４３では、基端から先端に向かうに連れて徐々に回転軸１１の外周面１１ａとの密着度が増していく。従って、密着筒部４３を備えない従来の油飛散防止用ワッシャよりも、回転軸１１の外周面との密着度が増す。その結果、軸受１６から滲み出た潤滑油が、密着筒部４３の内周面４３ａと回転軸１１の外周面１１ａとの間に浸入し、油飛散防止用ワッシャ４１の軸受１６側から整流子１４側に到達することが防止される。   In the motor configured as described above, the close contact cylinder portion 43 provided in the oil scattering prevention washer 41 is gradually reduced in diameter from the proximal end toward the distal end, and the inner diameter (the inner diameter of the press-fit hole 44) is At the proximal end of the contact cylinder portion 43, the diameter is equal to the diameter of the fitting hole 42, but gradually decreases toward the distal end. Therefore, in the close contact cylinder portion 43, the close contact degree with the outer peripheral surface 11a of the rotating shaft 11 gradually increases from the proximal end toward the distal end. Therefore, the degree of adhesion with the outer peripheral surface of the rotating shaft 11 is increased as compared with the conventional oil scattering prevention washer that does not include the tightly adhered cylinder portion 43. As a result, the lubricating oil that has oozed out of the bearing 16 enters between the inner peripheral surface 43a of the tightly contacting cylinder portion 43 and the outer peripheral surface 11a of the rotating shaft 11, and the commutator from the bearing 16 side of the washer 41 for preventing oil scattering. Reaching the 14th side is prevented.

上記したように、本第２実施形態によれば、以下の効果を有する。
（１）密着筒部４３は、その先端における内径が嵌入孔４２の内径よりも小さくなるように基端から先端に向かって徐々に縮径されている。従って、油飛散防止用ワッシャ４１に回転軸１１が圧入された状態においては、回転軸１１の外周面１１ａに対する密着度は、嵌入孔４２の内周面よりも密着筒部４３の内周面の方が大きい。即ち、密着筒部４３では、回転軸１１への密着度が従来の油飛散防止用ワッシャよりも大きい。そのため、軸受１６から滲み出た潤滑油は、密着筒部４３の内周面と回転軸１１の外周面１１ａとの間に浸入し難い。従って、軸受１６から滲み出た潤滑油が、油飛散防止用ワッシャ４１の内周面（密着筒部４３の内周面及び嵌入孔４２の内周面）を通って油飛散防止用ワッシャ４１の軸受１６側から整流子１４側に到達することが防止される。その結果、回転軸１１において油飛散防止用ワッシャ４１の反軸受１６側に固定されたコア１３や整流子１４に軸受１６の潤滑油が付着することを抑制することができる。 As described above, the second embodiment has the following effects.
(1) The close contact cylinder portion 43 is gradually reduced in diameter from the proximal end toward the distal end so that the inner diameter at the distal end is smaller than the inner diameter of the insertion hole 42. Therefore, in a state where the rotary shaft 11 is press-fitted into the oil scattering prevention washer 41, the degree of adhesion of the rotary shaft 11 to the outer peripheral surface 11 a is higher than that of the inner peripheral surface of the fitting hole 42. Is bigger. That is, in the close contact cylinder portion 43, the close contact degree with the rotary shaft 11 is larger than that of the conventional oil splatter prevention washer. Therefore, the lubricating oil that has oozed out from the bearing 16 is unlikely to enter between the inner peripheral surface of the close contact cylinder portion 43 and the outer peripheral surface 11 a of the rotary shaft 11. Accordingly, the lubricating oil that has oozed out of the bearing 16 passes through the inner peripheral surface of the oil scattering prevention washer 41 (the inner peripheral surface of the tightly fitting cylinder portion 43 and the inner peripheral surface of the fitting hole 42). Reaching the commutator 14 side from the bearing 16 side is prevented. As a result, it is possible to suppress the lubricant of the bearing 16 from adhering to the core 13 and the commutator 14 that are fixed to the anti-bearing 16 side of the oil scattering prevention washer 41 in the rotating shaft 11.

また、密着筒部４３は、嵌入孔４２の開口部から軸方向に沿って延設されていることから、密着筒部４３を備えた油飛散防止用ワッシャ４１は、回転軸１１の外周面１１ａと当接する部分の軸方向の長さが従来の油飛散防止用ワッシャよりも長い。従って、たとえ油飛散防止用ワッシャ４１の内周面と回転軸１１の外周面１１ａとの間に潤滑油が浸入したとしても、油飛散防止用ワッシャ４１の整流子１４側の端部まで到達することを防止することができる。   Further, since the close contact cylinder portion 43 extends in the axial direction from the opening portion of the fitting hole 42, the oil scattering prevention washer 41 provided with the close contact cylinder portion 43 is provided on the outer peripheral surface 11 a of the rotating shaft 11. The length in the axial direction of the portion in contact with the oil is longer than that of a conventional washer for preventing oil scattering. Therefore, even if the lubricating oil enters between the inner peripheral surface of the oil scatter preventing washer 41 and the outer peripheral surface 11a of the rotating shaft 11, the oil scatter preventing washer 41 reaches the end on the commutator 14 side. This can be prevented.

尚、本発明の実施形態は、以下のように変更してもよい。
○上記第１実施形態では、油飛散防止用ワッシャ３１は、固定部３５及び油だまり部３６を備えているが、これらを備えない構成であってもよい。例えば、図４に示す油飛散防止用ワッシャ５１は、円板状をなす合成樹脂（ＰＡ（ポリアミド樹脂）やナイロン系の合成樹脂等）製のワッシャ本体５２と、該ワッシャ本体５２の径方向内側に備えられ弾性材料（多例えばエラストマ）よりなる内環部５３とから構成されている。ワッシャ本体５２の径方向中央部には、貫通孔５４が形成されている。内環部５３は、回転軸１１が圧入される圧入孔５５を備えた円環状をなしており、ワッシャ本体５２の貫通孔５４の内周面に一体に成形されている。このように構成された油飛散防止用ワッシャ５１は、整流子５６との間に間隙を有して回転軸１１に固定されている。また、油飛散防止用ワッシャ５１と軸受１６との間には、両者に当接するようにしてワッシャ５７が介在されている。このワッシャ５７は、油飛散防止用ワッシャ５１と軸受１６との間の摺動音を抑制するために設けられており、径方向中央に形成された挿入孔５８の内径は、回転軸１１の外径よりも若干大きく形成されている。このように構成しても、内環部５３の内周面５３ａと回転軸１１の外周面１１ａとが密着するため、軸受１６から滲み出た潤滑油が内環部５３の内周面５３ａと回転軸１１の外周面１１ａとの間に浸入し難い。従って、回転軸１１において油飛散防止用ワッシャ５１の反軸受１６側に固定されたコアや整流子５６に軸受１６の潤滑油が付着することを抑制することができる。尚、ワッシャ５７は省略してもよい。 In addition, you may change embodiment of this invention as follows.
In the first embodiment, the oil scattering preventing washer 31 includes the fixed portion 35 and the oil pool portion 36, but may be configured without these. For example, the oil scattering prevention washer 51 shown in FIG. 4 includes a washer body 52 made of a synthetic resin (PA (polyamide resin), nylon synthetic resin, etc.) having a disk shape, and a radially inner side of the washer body 52. And an inner ring portion 53 made of an elastic material (multiple, for example, elastomer). A through hole 54 is formed in the central portion of the washer body 52 in the radial direction. The inner ring portion 53 has an annular shape including a press-fit hole 55 into which the rotary shaft 11 is press-fit, and is integrally formed on the inner peripheral surface of the through hole 54 of the washer body 52. The oil scattering prevention washer 51 thus configured is fixed to the rotating shaft 11 with a gap between the commutator 56. Further, a washer 57 is interposed between the oil scattering preventing washer 51 and the bearing 16 so as to be in contact with both. The washer 57 is provided in order to suppress sliding noise between the oil scattering preventing washer 51 and the bearing 16, and the inner diameter of the insertion hole 58 formed at the center in the radial direction is outside the rotating shaft 11. It is formed slightly larger than the diameter. Even in this configuration, the inner peripheral surface 53a of the inner ring portion 53 and the outer peripheral surface 11a of the rotating shaft 11 are in close contact with each other, so that the lubricating oil that has oozed out from the bearing 16 and the inner peripheral surface 53a of the inner ring portion 53 are in contact with each other. It is difficult to enter between the outer peripheral surface 11 a of the rotating shaft 11. Therefore, it is possible to suppress the lubricating oil of the bearing 16 from adhering to the core and the commutator 56 that are fixed to the anti-bearing 16 side of the oil scattering preventing washer 51 in the rotating shaft 11. The washer 57 may be omitted.

○図４に示すワッシャ５７に上記第２実施形態の密着筒部４３を設けて、ワッシャ５７を図５（ａ）（ｂ）に示すような油飛散防止用ワッシャ６１としてもよい。油飛散防止用ワッシャ６１は、径方向中央部に嵌入孔６２を備えた円板状をなしている。そして、嵌入孔６２の軸受１６側の端部に密着筒部４３が設けられている。この場合、油飛散防止用ワッシャ６１は、密着筒部４３及び嵌入孔６２に回転軸１１が圧入されることにより回転軸１１に対して固定されており、回転軸１１と一体回転する。このように構成すると、モータは２枚の油飛散防止用ワッシャ５１，６１を備えるため、回転軸１１において、油飛散防止用ワッシャ５１，６１の反軸受１６側に固定されたコアや整流子５６に軸受１６の潤滑油が付着することをより抑制することができる。尚、油飛散防止用ワッシャ５１を省略して油飛散防止用ワッシャ６１のみを備える構成としてもよい。   The contact cylinder part 43 of the second embodiment may be provided on the washer 57 shown in FIG. 4, and the washer 57 may be an oil scattering prevention washer 61 as shown in FIGS. The oil scattering prevention washer 61 has a disk shape with a fitting hole 62 in the radial center. A close contact cylinder portion 43 is provided at the end of the fitting hole 62 on the bearing 16 side. In this case, the oil scattering preventing washer 61 is fixed to the rotating shaft 11 when the rotating shaft 11 is press-fitted into the tightly fitting cylinder portion 43 and the fitting hole 62, and rotates integrally with the rotating shaft 11. If comprised in this way, since the motor is equipped with the two oil-splash prevention washers 51 and 61, in the rotating shaft 11, the core fixed to the anti-bearing 16 side of the oil-splash prevention washers 51 and 61, and the commutator 56 It is possible to further prevent the lubricating oil of the bearing 16 from adhering to the surface. Note that the oil scattering prevention washer 51 may be omitted, and only the oil scattering prevention washer 61 may be provided.

○密着筒部４３は、嵌入孔４２の整流子１４側の端部に設けられてもよい。
○上記第１実施形態では、油飛散防止用ワッシャ３１は、二色成形によってワッシャ本体３２と内環部３３とが一体に形成されているが、これに限らない。例えば、接着剤を用いて内環部３３をワッシャ本体３２に固定してもよい。 The close contact cylinder portion 43 may be provided at the end of the fitting hole 42 on the commutator 14 side.
In the first embodiment, the oil scattering prevention washer 31 is formed integrally with the washer main body 32 and the inner ring portion 33 by two-color molding, but is not limited thereto. For example, the inner ring portion 33 may be fixed to the washer body 32 using an adhesive.

○内環部３３は、エラストマ以外の弾性材料にて形成されてもよい。
○上記第１実施形態では、内環部３３は、ワッシャ本体３２の内周面（貫通孔３７）に直接形成されているがこれに限らない。内環部３３は、ワッシャ本体の内周面側で回転軸１１が圧入されるように設けられていればよく、例えば、ワッシャ本体３２の内周面と内環部３３の外周面との間に環状の部材が介在されていてもよい。 The inner ring portion 33 may be formed of an elastic material other than elastomer.
In the first embodiment, the inner ring portion 33 is formed directly on the inner peripheral surface (through hole 37) of the washer body 32, but is not limited thereto. The inner ring portion 33 may be provided so that the rotary shaft 11 is press-fitted on the inner peripheral surface side of the washer main body. For example, the inner ring portion 33 is provided between the inner peripheral surface of the washer main body 32 and the outer peripheral surface of the inner ring portion 33. An annular member may be interposed therebetween.

○上記各実施形態では、油飛散防止用ワッシャ３１，４１は、回転軸１１において整流子１４と軸受１６との間に固定されているがこれに限らない。例えば、回転軸１１においてコア１３と軸受１５との間に固定されてもよい。   In each of the above embodiments, the oil splatter prevention washers 31 and 41 are fixed between the commutator 14 and the bearing 16 on the rotating shaft 11, but are not limited thereto. For example, the rotary shaft 11 may be fixed between the core 13 and the bearing 15.

上記各実施形態から把握できる技術的思想を以下に記載する。
（イ）前記密着筒部は、前記嵌入孔の軸受側の端部に設けられていることを特徴とする。このように構成すると、油飛散防止用ワッシャの内周面と回転軸の外周面との間に潤滑油が浸入することをより防止することができる。 The technical idea that can be grasped from each of the above embodiments will be described below.
(B) pre-Symbol adhesion tubular section, characterized in that provided at the end of the bearing side of the insertion hole. If comprised in this way, it can prevent more that lubricating oil permeates between the internal peripheral surface of the washer for oil scattering prevention, and the outer peripheral surface of a rotating shaft.

第１実施形態のモータの断面図。Sectional drawing of the motor of 1st Embodiment. 第１実施形態のモータにおける整流子付近の部分拡大図。The elements on larger scale near the commutator in the motor of the first embodiment. （ａ）は第２実施形態の油飛散防止ワッシャの断面図、（ｂ）は第２実施形態のモータにおける整流子付近の部分拡大図。(A) is sectional drawing of the oil scattering prevention washer of 2nd Embodiment, (b) is the elements on larger scale near the commutator in the motor of 2nd Embodiment. 別の形態の油飛散防止用ワッシャを示す断面図。Sectional drawing which shows the washer for oil scattering prevention of another form. （ａ）は別の形態の油飛散防止用ワッシャを示す断面図、（ｂ）は図５（ａ）に示す油飛散防止用ワッシャを備えたモータにおける整流子付近の部分拡大図。(A) is sectional drawing which shows the washer for oil scattering prevention of another form, (b) is the elements on larger scale near the commutator in the motor provided with the oil scattering prevention washer shown to Fig.5 (a).

符号の説明Explanation of symbols

１…モータ、７…モータハウジング、１１…回転軸、１１ａ…回転軸の外周面、１２…巻線、１３…コア、１４，５６…整流子、１５，１６…軸受、２１…支持部材、２２…整流子片、２７…給電用ブラシ、３１，４１，５１，６１…油飛散防止用ワッシャ、３２，５２…ワッシャ本体、３３，５３…内環部、３５…固定部、３７，５４…貫通孔、３９，５５…圧入孔、４２，６２…嵌入孔、４２ａ…嵌入孔の端部、４３…密着筒部。   DESCRIPTION OF SYMBOLS 1 ... Motor, 7 ... Motor housing, 11 ... Rotating shaft, 11a ... Outer peripheral surface of rotating shaft, 12 ... Winding, 13 ... Core, 14, 56 ... Commutator, 15, 16 ... Bearing, 21 ... Support member, 22 ... Commutator piece, 27 ... Brush for power supply, 31, 41, 51, 61 ... Washer for preventing oil scattering, 32, 52 ... Washer body, 33, 53 ... Inner ring part, 35 ... Fixed part, 37, 54 ... Through Holes 39, 55 ... press-fitting holes, 42, 62 ... fitting holes, 42a ... end portions of the fitting holes, 43 ... contact cylinders.

Claims (1)

モータハウジングに設けられ潤滑油が含浸された軸受と、
巻線が巻回されたコアが固定され、前記軸受によって回転可能に支持された回転軸と、
前記回転軸に固定される支持部材を備えるとともに、該支持部材の外周面に配設され給電用ブラシが摺接される複数の整流子片を備えた整流子と、
前記整流子と前記軸受との間に介在され前記回転軸と一体回転する油飛散防止用ワッシャと
を備えたモータであって、
前記油飛散防止用ワッシャは、
径方向中央部に前記回転軸の外径より大きい内径を有する貫通孔を備えるとともに、前記整流子の径方向外側から複数の前記整流子片に当接して複数の前記整流子片を前記支持部材に固定する固定部を備えたワッシャ本体と、
前記ワッシャ本体の径方向内側であって前記貫通孔の内周面側に形成され、前記回転軸が圧入される圧入孔を備え前記回転軸の外周面に対して密着する環状の内環部と
を備え、合成樹脂よりなる前記ワッシャ本体とエラストマよりなる前記内環部とが二色成形により一体に形成されていることを特徴とするモータ。 A bearing provided in the motor housing and impregnated with lubricating oil;
Winding core wound is fixed, a rotation shaft which is rotatably supported by the bearing,
A commutator including a plurality of commutator pieces that are provided on the outer peripheral surface of the support member and that are in sliding contact with the power supply brush, the support member being fixed to the rotating shaft.
A motor interposed an oil scattering preventing washer which rotates integrally with the rotary shaft between the before and Symbol commutator bearings,
The oil scattering prevention washer is
A through hole having an inner diameter larger than the outer diameter of the rotating shaft is provided in a central portion in the radial direction, and a plurality of the commutator pieces are brought into contact with the plurality of commutator pieces from the radially outer side of the commutator. A washer body with a fixing part to be fixed to the
An annular inner ring formed inside the washer body in the radial direction and on the inner peripheral surface side of the through-hole, and having a press-fitting hole into which the rotary shaft is press-fitted , and closely contacting the outer peripheral surface of the rotary shaft ; A motor characterized in that the washer body made of synthetic resin and the inner ring portion made of elastomer are integrally formed by two-color molding .
JP2004362881A 2004-12-15 2004-12-15 motor Expired - Fee Related JP4516418B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000136829A (en) * 1998-11-02 2000-05-16 Nsk Ltd Rolling bearing with sealing plate, spindle motor incorporating this rolling bearing, and hard disk drive device incorporating this spindle motor
JP2001224148A (en) * 2000-02-08 2001-08-17 Asmo Co Ltd Bearing device of motor
JP2001258198A (en) * 2000-03-10 2001-09-21 Sanyo Electric Co Ltd Induction motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000136829A (en) * 1998-11-02 2000-05-16 Nsk Ltd Rolling bearing with sealing plate, spindle motor incorporating this rolling bearing, and hard disk drive device incorporating this spindle motor
JP2001224148A (en) * 2000-02-08 2001-08-17 Asmo Co Ltd Bearing device of motor
JP2001258198A (en) * 2000-03-10 2001-09-21 Sanyo Electric Co Ltd Induction motor

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