JP4926226B2 - Electric motor - Google Patents

Electric motor Download PDF

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JP4926226B2
JP4926226B2 JP2009248974A JP2009248974A JP4926226B2 JP 4926226 B2 JP4926226 B2 JP 4926226B2 JP 2009248974 A JP2009248974 A JP 2009248974A JP 2009248974 A JP2009248974 A JP 2009248974A JP 4926226 B2 JP4926226 B2 JP 4926226B2
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cylindrical portion
holding portion
seal
seal holding
output shaft
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JP2011097734A (en
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洋 白坂
和彦 吉田
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Kitashiba Electric Co Ltd
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Kitashiba Electric Co Ltd
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Description

本発明は、エンジンケースの外部に設けた回転駆動部からエンジンケースの内部に出力軸を延出する電動モータに関する。   The present invention relates to an electric motor that extends an output shaft into the interior of an engine case from a rotary drive provided outside the engine case.

例えば、多気筒エンジンの各気筒に設けられた吸気バルブのバルブリフト量を変更する機構では、この機構の駆動源として電動モータを用いることが知られている（例えば、特許文献１参照）。   For example, in a mechanism that changes the valve lift amount of an intake valve provided in each cylinder of a multi-cylinder engine, it is known to use an electric motor as a drive source of this mechanism (see, for example, Patent Document 1).

この種の電動モータは、ロータや整流子を収容したヨークに組み付けられたブラケットとを備え、このブラケットを介してエンジンケースに取り付けられる。ブラケットには、ロータの出力軸を回転自在に支持するベアリングや整流子に接触するブラシが支持されている。エンジンケースには、複数の吸気バルブや、各バルブリフタを押圧するカムを備えるカムシャフト等のエンジン作動部が収容されており、ロータの出力軸はブラケットを貫通して、エンジン作動部を収容するエンジンケースの内部に延出される。   This type of electric motor includes a bracket assembled to a yoke that houses a rotor and a commutator, and is attached to the engine case via the bracket. The bracket supports a bearing that rotatably supports the output shaft of the rotor and a brush that contacts the commutator. The engine case houses an engine operating part such as a camshaft having a plurality of intake valves and a cam that presses each valve lifter, and the rotor output shaft passes through the bracket to accommodate the engine operating part. Extends inside the case.

ところで、電動モータをエンジンケースに取り付けたとき、ロータの出力軸の延出により、ヨークの内部とエンジンケースの内部とが連通状態となり、エンジンケース内部の作動油がブラケットを経てヨーク内部に浸入する場合がある。そして、エンジンの作動油がヨーク内部に浸入すると、整流子やブラシに作動油が付着してスパークの異常発生等により整流子やブラシが損傷（激しく磨耗）するだけでなく、ロータの回転が阻害されて出力軸を高精度に回転させることができなくなり、吸気バルブのバルブリフト量を変更するための高精度な制御が行えなくなる。   By the way, when the electric motor is attached to the engine case, the extension of the output shaft of the rotor brings the inside of the yoke into communication with the inside of the engine case, and the hydraulic oil in the engine case enters the yoke through the bracket. There is a case. When engine hydraulic fluid enters the yoke, the hydraulic fluid adheres to the commutator and brush, causing not only damage to the commutator and brush due to the occurrence of spark abnormalities, but also impeding rotor rotation. As a result, the output shaft cannot be rotated with high accuracy, and high-precision control for changing the valve lift amount of the intake valve cannot be performed.

このため、ブラケットと出力軸との間の空隙を遮蔽するための環状のシール部材を設け、ヨーク内部への作動油の浸入を防止することが行われている。即ち、ブラケットに出力軸を包囲する筒状のシール保持部を設け、シール保持部内にシール部材を圧入すると共に出力軸に外挿する（例えば、特許文献２参照）。   For this reason, an annular seal member for shielding the gap between the bracket and the output shaft is provided to prevent the working oil from entering the yoke. That is, a cylindrical seal holding portion that surrounds the output shaft is provided on the bracket, and a seal member is press-fitted into the seal holding portion and extrapolated to the output shaft (for example, see Patent Document 2).

特開２００４−２７０６０８（図１）JP-A-2004-270608 (FIG. 1) 特開２００３−１９９２８２号公報（図１）Japanese Patent Laying-Open No. 2003-199282 (FIG. 1)

しかし、シール部材を保持したシール保持部は、その先端がエンジンケースの内部で開放されているため、エンジンケースからブラケットに伝達される振動等の影響により、シール保持部からシール部材が抜け出すおそれがある。   However, since the tip of the seal holding portion holding the seal member is open inside the engine case, the seal member may come out of the seal holding portion due to the influence of vibration transmitted from the engine case to the bracket. is there.

また、シール保持部からシール部材の抜け出しを防止するために、例えば、図３に示すように、シール保持部３０の先端側（エンジンケースへの取り付け側）を延長させ、この延長部３１に抜け止め部材３２を設けることが考えられる。抜け止め部材３２としてはＣ型の止め輪（スナップリング）を採用することができ、延長部３１の内周面全周に溝部３３を形成して、この溝部３３に抜け止め部材３２を嵌合させればよい。これによれば、構造簡単で、しかもシール保持部３０からのシール部材３４の抜け出しを確実に防止することができる。   Further, in order to prevent the seal member from coming out of the seal holding portion, for example, as shown in FIG. 3, the distal end side (attachment side to the engine case) of the seal holding portion 30 is extended, and the extension portion 31 is pulled out. It is conceivable to provide the stop member 32. A C-shaped retaining ring (snap ring) can be adopted as the retaining member 32, and a groove portion 33 is formed on the entire inner peripheral surface of the extension portion 31, and the retaining member 32 is fitted into the groove portion 33. You can do it. According to this, the structure is simple, and the seal member 34 can be reliably prevented from coming out of the seal holding portion 30.

しかし、シール保持部３０を延長させた延長部３１を設けると、シール部材３４をシール保持部３０に圧入する際に、延長部３１からシール保持部３０に至る比較的長い距離にわたる内周面への摺接や、溝部３３により延長部３１の内周面に形成されている角部３５への摺接によりシール部材３４の外周面が損傷してシール性が極度に低下する不都合がある。   However, when the extension portion 31 that extends the seal holding portion 30 is provided, when the seal member 34 is press-fitted into the seal holding portion 30, the inner peripheral surface over a relatively long distance from the extension portion 31 to the seal holding portion 30 is provided. There is a disadvantage that the outer peripheral surface of the seal member 34 is damaged due to the sliding contact of the groove member 33 and the sliding contact with the corner portion 35 formed on the inner peripheral surface of the extension portion 31 by the groove portion 33, and the sealing performance is extremely lowered.

上記の点に鑑み、本発明は、シール部材によるシール性を損なうことなくシール保持部からのシール部材の抜け出しを確実に防止した電動モータを提供することを目的とする。   In view of the above points, an object of the present invention is to provide an electric motor that reliably prevents the sealing member from coming out of the seal holding portion without impairing the sealing performance of the sealing member.

本発明は、ロータを収容するヨークと、エンジン作動部が収容されたエンジンケースの外面に前記ヨークを連結するブラケットとを備え、前記ロータの出力軸が、前記ブラケットを貫通して前記エンジンケースの内部に延出する電動モータにおいて、前記ブラケットは、前記出力軸を包囲して先端がエンジンケースの内部で開放する筒状部を備え、該筒状部は、前記出力軸に外挿される環状のシール部材を該筒状部の先端側から圧入して保持するシール保持部と、該シール保持部の先端に連設されて該シール保持部よりも内径が大きい大径筒部と、該大径筒部の内周壁に周方向に刻設された環状溝部と、該環状溝部に嵌合することにより大径筒部の内周壁に取り付けられて前記シール保持部からのシール部材の抜け出しを規制する抜け止め部材とを備えることを特徴とする。   The present invention includes a yoke that houses a rotor, and a bracket that connects the yoke to an outer surface of an engine case that houses an engine operating portion, and an output shaft of the rotor penetrates the bracket and In the electric motor extending inward, the bracket includes a cylindrical portion that surrounds the output shaft and has a tip opened inside the engine case, and the cylindrical portion is an annular shape that is extrapolated to the output shaft. A seal holding portion that press-fits and holds the seal member from the distal end side of the cylindrical portion, a large-diameter cylindrical portion that is connected to the distal end of the seal holding portion and has an inner diameter larger than the seal holding portion, and the large diameter An annular groove engraved in the circumferential direction on the inner peripheral wall of the cylindrical portion, and fitted to the annular groove to be attached to the inner peripheral wall of the large-diameter cylindrical portion, thereby restricting the seal member from coming out of the seal holding portion. Retaining part Characterized in that it comprises and.

上記構成により、シール保持部に保持されたシール部材は、大径筒部に設けられた抜け止め部材により、シール保持部からの抜け出しが防止される。これにより、シール保持部におけるシール部材の保持状態を確実に維持することができる。   With the above configuration, the seal member held by the seal holding portion is prevented from coming out of the seal holding portion by the retaining member provided in the large diameter cylindrical portion. Thereby, the holding | maintenance state of the sealing member in a seal holding part can be maintained reliably.

更に、本発明によれば、シール保持部の先端に大径筒部を連設し、この大径筒部の環状溝部に抜け止め部材を嵌合させて設けた。大径筒部は、シール保持部よりも内径が大きく形成されているので、シール部材をシール保持部に圧入するときに、シール部材は大径筒部の内周面に接触せず、環状溝部にも接触しない。従って、大径筒部の内周面や環状溝部への摺接によりシール部材の外周面が損傷することがなく、シール部材の高いシール性を維持して、ヨーク内部へのエンジン作動油の浸入を確実に防止することができる。   Further, according to the present invention, the large-diameter cylindrical portion is continuously provided at the tip of the seal holding portion, and the retaining member is fitted into the annular groove portion of the large-diameter cylindrical portion. Since the large-diameter cylindrical portion has an inner diameter larger than that of the seal holding portion, when the seal member is press-fitted into the seal holding portion, the seal member does not contact the inner peripheral surface of the large-diameter cylindrical portion, and the annular groove portion Also do not touch. Therefore, the outer peripheral surface of the seal member is not damaged by the sliding contact with the inner peripheral surface of the large-diameter cylindrical portion or the annular groove portion, and the high sealing performance of the seal member is maintained, and the engine hydraulic oil enters the inside of the yoke. Can be reliably prevented.

また、本発明においては、前記シール保持部と前記大径筒部との境界全周に、前記シール部材のシール保持部への圧入を案内する面取り部を設けることが好ましい。大径筒部はシール保持部よりも内径が大きく形成されているため、シール保持部と大径筒部との境界には段差が形成されるが、境界全周に面取り部を設けることにより、大径筒部からシール保持部へ向かうシール部材が面取り部に案内されるので、シール部材を損傷させることなく円滑に圧入することができる。しかも、大径筒部の内径がシール保持部よりも大きいことにより、前記面取り部の加工を容易に行うことが可能となり、高精度な面取り部が形成できる利点もある。   Moreover, in this invention, it is preferable to provide the chamfering part which guides the press injection to the seal holding part of the said seal member in the perimeter periphery of the said seal holding part and the said large diameter cylinder part. Since the inner diameter of the large diameter cylindrical portion is larger than that of the seal holding portion, a step is formed at the boundary between the seal holding portion and the large diameter cylindrical portion, but by providing a chamfered portion around the entire boundary, Since the seal member heading from the large-diameter cylindrical portion toward the seal holding portion is guided to the chamfered portion, it can be smoothly press-fitted without damaging the seal member. Moreover, since the inner diameter of the large-diameter cylindrical portion is larger than that of the seal holding portion, the chamfered portion can be easily processed, and there is an advantage that a highly accurate chamfered portion can be formed.

本発明の実施形態の電動モータを示す断面図。Sectional drawing which shows the electric motor of embodiment of this invention. 図１の要部の拡大図。The enlarged view of the principal part of FIG. 従来のブラケットの一部を示す断面図。Sectional drawing which shows a part of conventional bracket.

本実施形態の電動モータは、図１に示すように、一端が開放され他端が閉塞された筒状のケースとなる金属製ヨーク１と、ヨーク１の開放された端部に設けられたブラケット２と、ヨーク１の内側に固定された永久磁石３と、永久磁石３の内側に設けられたロータ４（電機子）と、ロータ４に設けられた出力軸５とを備えている。   As shown in FIG. 1, the electric motor of the present embodiment includes a metal yoke 1 that forms a cylindrical case with one end open and the other end closed, and a bracket provided at the open end of the yoke 1. 2, a permanent magnet 3 fixed inside the yoke 1, a rotor 4 (armature) provided inside the permanent magnet 3, and an output shaft 5 provided on the rotor 4.

出力軸５は、ヨーク１の閉塞された端部に保持された第１ベアリング６と、ブラケット２に組み付けられた第２ベアリング７とによって回転自在に支持されている。   The output shaft 5 is rotatably supported by a first bearing 6 held at the closed end of the yoke 1 and a second bearing 7 assembled to the bracket 2.

ロータ４は、電流により磁力を発生させる巻線を備えており、永久磁石３の磁力がロータ４の回転方向に作用して出力軸５が回転駆動される。ロータ４の巻線には、出力軸５に取り付けられた整流子８が電気的に接続されている。   The rotor 4 is provided with a winding that generates a magnetic force by an electric current, and the magnetic force of the permanent magnet 3 acts in the rotation direction of the rotor 4 so that the output shaft 5 is rotationally driven. A commutator 8 attached to the output shaft 5 is electrically connected to the winding of the rotor 4.

ブラケット２には、出力軸５が挿通された第２ベアリング７をばねワッシャ９と共に保持するベアリング保持部１０と、ベアリング保持部１０に隣接する位置に、支持板１１を介してブラシ１２を支持するブラシ支持部１３とを備えている。ブラシ１２は回転時の整流子８に弾発的に接触することにより整流子８を介してロータ４の巻線に電気的に接続される。また、ブラケット２には、図示しない電源（制御電圧を供給するコントローラ等）に接続するコネクタ１４を挿着するコネクタ装着部１５が形成されている。   The bracket 2 supports the brush 12 via a support plate 11 at a position adjacent to the bearing holding portion 10 and the bearing holding portion 10 that holds the second bearing 7 through which the output shaft 5 is inserted together with the spring washer 9. And a brush support portion 13. The brush 12 is electrically connected to the winding of the rotor 4 through the commutator 8 by elastically contacting the commutator 8 during rotation. Further, the bracket 2 is formed with a connector mounting portion 15 into which a connector 14 connected to a power source (not shown) (such as a controller that supplies a control voltage) is inserted.

ヨーク１とブラケット２とは、複数のボルト１６により図中一部を示すエンジンケース１７に連結される。ブラケット２は、エンジンケース１７に連結されたときにエンジンケース１７の内部に突出する筒状部１８を備えている。筒状部１８は、出力軸５を包囲して先端がエンジンケース１７の内部で開放されている。筒状部１８と共にエンジンケース１７の内部に延出する出力軸５の先端には、カップリング等の連結部材を介してエンジンケース１７の内部に設けられた図示しないエンジン作動部（多気筒エンジンの各気筒に設けられた吸気バルブのバルブリフト量を変更する機構等）の作動軸等に連結される。   The yoke 1 and the bracket 2 are connected by a plurality of bolts 16 to an engine case 17 partially shown in the figure. The bracket 2 includes a cylindrical portion 18 that protrudes into the engine case 17 when connected to the engine case 17. The cylindrical portion 18 surrounds the output shaft 5 and has a tip opened inside the engine case 17. At the tip of the output shaft 5 that extends into the engine case 17 together with the cylindrical portion 18, an engine operating portion (not shown) (not shown) provided inside the engine case 17 via a coupling member such as a coupling. It is connected to an operating shaft or the like of a mechanism that changes the valve lift amount of the intake valve provided in each cylinder.

図１に示すように、ブラケット２の筒状部１８は、防油性を有するシール部材１９を保持するシール保持部２０を備えている。シール部材１９は、シリコンゴム等の弾性体により環状に形成されており、出力軸５を回転自在として出力軸５の外周面に密着する内壁部２１と、この内壁部２１を出力軸５に圧接させるばねリング２２と、シール保持部２０の内周面に強固に密着する外壁部２３とを備えている。そして、シール部材１９は、出力軸５に外挿された状態（即ち出力軸５を挿通した状態）で、シール保持部２０に保持される。   As shown in FIG. 1, the cylindrical portion 18 of the bracket 2 includes a seal holding portion 20 that holds an oil-proof seal member 19. The seal member 19 is formed in an annular shape by an elastic body such as silicon rubber, and has an inner wall 21 that is in close contact with the outer peripheral surface of the output shaft 5 with the output shaft 5 being rotatable, and the inner wall 21 is pressed against the output shaft 5. A spring ring 22 is provided, and an outer wall portion 23 that is firmly attached to the inner peripheral surface of the seal holding portion 20. The seal member 19 is held by the seal holder 20 in a state of being extrapolated to the output shaft 5 (that is, a state of being inserted through the output shaft 5).

また、シール保持部２０の先端には、シール保持部２０よりも内径が大きい大径筒部２４が一体に連設されている。大径筒部２４の内周壁には、その全周に環状溝部２５が刻設されている。   Further, a large-diameter cylindrical portion 24 having an inner diameter larger than that of the seal holding portion 20 is integrally provided at the tip of the seal holding portion 20. On the inner peripheral wall of the large diameter cylindrical portion 24, an annular groove portion 25 is formed on the entire periphery.

環状溝部２５にはＣ型のばね板材により形成されたスナップリング２６（抜け止め部材）が嵌合されている。スナップリング２６は、大径筒部２４の内側に張出して設けられ、これによって、シール保持部２０に圧入されているシール部材１９が、シール保持部２０から抜け出すのを防止している。更に、スナップリング２６のシール部材１９側には平ワッシャ２７が遊挿状態で設けられ、スナップリング２６がＣ型であることによる不連続部分の隙間を平ワッシャ２７が閉塞している。   The annular groove 25 is fitted with a snap ring 26 (a retaining member) formed of a C-shaped spring plate material. The snap ring 26 is provided so as to protrude inside the large-diameter cylindrical portion 24, thereby preventing the seal member 19 press-fitted into the seal holding portion 20 from coming out of the seal holding portion 20. Further, a flat washer 27 is provided in a loosely inserted state on the seal member 19 side of the snap ring 26, and the flat washer 27 closes a gap in a discontinuous portion due to the snap ring 26 being C-shaped.

また、シール保持部２０と大径筒部２４との境界の段差部２８にはその全周に面取り部２９が形成され、大径筒部２４を経てシール保持部２０に圧入されるシール部材１９を案内してシール部材１９の圧入を円滑に行うことができるようになっている。面取り部２９は、通常は、段差部２８を切削加工することにより形成されるが、大径筒部２４がシール保持部２０の内径よりも大きいことにより、段差部２８まで切削工具が挿入し易くなっており、加工作業性が高く且つ高精度な面取り部２９を得ることができる。   In addition, a chamfered portion 29 is formed on the entire circumference of the step portion 28 at the boundary between the seal holding portion 20 and the large diameter cylindrical portion 24, and the seal member 19 is press-fitted into the seal holding portion 20 through the large diameter cylindrical portion 24. Thus, the sealing member 19 can be smoothly press-fitted. The chamfered portion 29 is usually formed by cutting the stepped portion 28. However, since the large diameter cylindrical portion 24 is larger than the inner diameter of the seal holding portion 20, a cutting tool can be easily inserted up to the stepped portion 28. Therefore, the chamfered portion 29 having high workability and high accuracy can be obtained.

シール部材１９の圧入作業は、出力軸５が挿通された第２ベアリング７をブラケット２に組み付けた後に行われる。先ず、図２において仮想線で示すように、出力軸５の先端側からシール部材１９を装着させてシール保持部２０に向かって摺接させる。このとき、シール部材１９は大径筒部２４に接触することなく出力軸５に沿って押し込まれ、シール保持部２０と大径筒部２４との境界の面取り部２９に当接する。更に、シール部材１９を押し込むと、面取り部２９に案内されてシール部材１９が縮径方向に圧縮されつつ、シール保持部２０の内部に移動する。このように、大径筒部２４を設けたことによって筒状部１８の全長は長くなるものの、シール部材１９の外周面が筒状部１８の内周面に摺接するのは面取り部２９及びシール保持部２０のみであるので、摺接距離が短く、シール部材１９の損傷を防止することができる。   The press-fitting operation of the seal member 19 is performed after the second bearing 7 through which the output shaft 5 is inserted is assembled to the bracket 2. First, as indicated by phantom lines in FIG. 2, the seal member 19 is attached from the distal end side of the output shaft 5 and is brought into sliding contact with the seal holding portion 20. At this time, the seal member 19 is pushed along the output shaft 5 without coming into contact with the large-diameter cylindrical portion 24 and comes into contact with the chamfered portion 29 at the boundary between the seal holding portion 20 and the large-diameter cylindrical portion 24. Further, when the seal member 19 is pushed in, the seal member 19 is guided to the chamfered portion 29 and is moved in the seal holding portion 20 while being compressed in the diameter reducing direction. Thus, although the overall length of the cylindrical portion 18 is increased by providing the large-diameter cylindrical portion 24, the outer peripheral surface of the seal member 19 is in sliding contact with the inner peripheral surface of the cylindrical portion 18. Since only the holding portion 20 is provided, the sliding contact distance is short, and damage to the seal member 19 can be prevented.

次いで、スナップリング２６の組み付けるが、このときの作業を説明すれば、図２に示すように、平ワッシャ２７を大径筒部２４に投入した後、スナップリング２６を弾発的に縮径させて大径筒部２４の環状溝部２５に嵌合させる。これにより、スナップリング２６は大径筒部２４の内周面に固定され、万一、シール部材１９がシール保持部２０からの抜け出し方向に移動しても、シール部材１９は平ワッシャ２７を介してスナップリング２６に当接し、シール保持部２０からの抜け出しが確実に防止される。   Next, the snap ring 26 is assembled. To explain the operation at this time, as shown in FIG. 2, after the flat washer 27 is inserted into the large diameter cylindrical portion 24, the snap ring 26 is elastically reduced in diameter. And fitted into the annular groove 25 of the large-diameter cylindrical portion 24. As a result, the snap ring 26 is fixed to the inner peripheral surface of the large-diameter cylindrical portion 24, and even if the seal member 19 moves in the direction of withdrawal from the seal holding portion 20, the seal member 19 passes through the flat washer 27. Thus, it comes into contact with the snap ring 26 and is surely prevented from coming off from the seal holder 20.

以上のように、本実施形態において説明した本発明の構成によれば、エンジン動作時の振動が電動モータに付与されても、シール保持部２０からのシール部材１９の抜け出しが確実に防止できる。しかも、大径筒部２４を設けることによって、シール部材１９の外周面を損傷させることなくシール部材１９をシール保持部２０に圧入することができる。従って、本発明による電動モータは、エンジンケース１７の内部の作動油が電動モータのヨーク１内部に浸入することを確実に防止して、整流子及びブラシの損傷や出力軸の回転精度の低下が防止できる。   As described above, according to the configuration of the present invention described in the present embodiment, even if vibration during engine operation is applied to the electric motor, the seal member 19 can be reliably prevented from coming off from the seal holding portion 20. In addition, by providing the large-diameter cylindrical portion 24, the seal member 19 can be pressed into the seal holding portion 20 without damaging the outer peripheral surface of the seal member 19. Therefore, the electric motor according to the present invention reliably prevents the hydraulic oil inside the engine case 17 from entering the yoke 1 of the electric motor, and the commutator and the brush are damaged and the rotation accuracy of the output shaft is reduced. Can be prevented.

１…ヨーク、２…ブラケット、４…ロータ、５…出力軸、１７…エンジンケース、１８…筒状部、１９…シール部材、２０…シール保持部、２４…大径筒部、２５…環状溝部、２６…スナップリング（抜け止め部材）、２９…面取り部。   DESCRIPTION OF SYMBOLS 1 ... Yoke, 2 ... Bracket, 4 ... Rotor, 5 ... Output shaft, 17 ... Engine case, 18 ... Cylindrical part, 19 ... Seal member, 20 ... Seal holding part, 24 ... Large diameter cylindrical part, 25 ... Annular groove part , 26 ... snap ring (retaining member), 29 ... chamfered portion.

Claims (2)

ロータを収容するヨークと、エンジン作動部が収容されたエンジンケースの外面に前記ヨークを連結するブラケットとを備え、前記ロータの出力軸が、前記ブラケットを貫通して前記エンジンケースの内部に延出する電動モータにおいて、
前記ブラケットは、前記出力軸を包囲して先端がエンジンケースの内部で開放する筒状部を備え、
該筒状部は、前記出力軸に外挿される環状のシール部材を該筒状部の先端側から圧入して保持するシール保持部と、該シール保持部の先端に連設されて該シール保持部よりも内径が大きい大径筒部と、該大径筒部の内周壁に周方向に刻設された環状溝部と、該環状溝部に嵌合することにより大径筒部の内周壁に取り付けられて前記シール保持部からのシール部材の抜け出しを規制する抜け止め部材とを備えることを特徴とする電動モータ。 A yoke for housing the rotor; and a bracket for connecting the yoke to an outer surface of the engine case in which the engine operating unit is housed. The output shaft of the rotor extends through the bracket and into the engine case. In the electric motor that
The bracket includes a cylindrical portion that surrounds the output shaft and has a tip opened inside the engine case;
The cylindrical portion includes a seal holding portion that presses and holds an annular seal member that is externally inserted to the output shaft from the distal end side of the cylindrical portion, and a seal holding portion that is continuously provided at the distal end of the seal holding portion. A large-diameter cylindrical portion having an inner diameter larger than that of the portion, an annular groove portion engraved in the circumferential direction on the inner peripheral wall of the large-diameter cylindrical portion, and being attached to the inner peripheral wall of the large-diameter cylindrical portion by fitting into the annular groove portion And an anti-removal member that restricts the removal of the seal member from the seal holding portion. 前記シール保持部と前記大径筒部との境界全周に、前記シール部材のシール保持部への圧入を案内する面取り部を設けたことを特徴とする請求項１記載の電動モータ。   The electric motor according to claim 1, wherein a chamfered portion that guides press-fitting of the seal member into the seal holding portion is provided around the entire boundary between the seal holding portion and the large-diameter cylindrical portion.
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