JP5339806B2 - Structure for fixing motor shaft and pinion gear, and geared motor having the structure - Google Patents

Structure for fixing motor shaft and pinion gear, and geared motor having the structure Download PDF

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JP5339806B2
JP5339806B2 JP2008191842A JP2008191842A JP5339806B2 JP 5339806 B2 JP5339806 B2 JP 5339806B2 JP 2008191842 A JP2008191842 A JP 2008191842A JP 2008191842 A JP2008191842 A JP 2008191842A JP 5339806 B2 JP5339806 B2 JP 5339806B2
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motor
motor shaft
pinion gear
shaft
gear
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JP2010035263A (en
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衛 大塚
克 佐々木
剛 佐藤
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Oriental Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure for motor shafts and pinion gears wherein the strength of fixture between a motor shaft and a pinion gear is high and its axial length is reduced, and to provide a geared motor equipped with this structure. <P>SOLUTION: The fixing structure is for a motor shaft and a pinion gear, in a motor provided on the motor shaft with the pinion gear. An axial hole 28 is formed at the chip of the motor shaft 24 on its central axis line; an axial shank 40a is protruded in the center of the pinion gear 40; and the shank 40a is press-fit into the hole 28 in the motor shaft 24, and the pinion gear 40 is thereby fixed on the motor shaft 24. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、モータシャフトとピニオンギヤの固定構造、およびその構造を備えたギヤードモータに関する。   The present invention relates to a structure for fixing a motor shaft and a pinion gear, and a geared motor having the structure.

従来のモータのモータシャフトとピニオンギヤの固定構造としては、たとえば実用新案登録２５６３５６９号（特許文献１参照）が知られている。
特許文献１には、小形モータのモータシャフト（回転軸）にピニオンギヤ（駆動歯車）の円形穴よりわずかに小さい円柱部を設けるとともに、ピニオンギヤには円形穴を設け、モータシャフトの円柱部をピニオンギヤの円形穴に挿入してモータシャフトとピニオンギヤとを固定する構造が開示されている。
実用新案登録第２５６３５６９号公報 As a conventional structure for fixing the motor shaft and pinion gear of a motor, for example, Utility Model Registration No. 2563569 (see Patent Document 1) is known.
In Patent Document 1, a cylindrical portion slightly smaller than the circular hole of the pinion gear (drive gear) is provided on the motor shaft (rotary shaft) of the small motor, the circular hole is provided in the pinion gear, and the cylindrical portion of the motor shaft is connected to the pinion gear. A structure in which a motor shaft and a pinion gear are fixed by being inserted into a circular hole is disclosed.
Utility Model Registration No. 2563569

特許文献１に開示されている従来技術では、モータシャフト側に円柱部を、ピニオンギヤ側に円形穴を設け、両者を嵌め合わせてモータシャフトとピニオンギヤとを固定するようにしているため、ピニオンギヤに圧入による歪みが発生しやすいという問題がある。
このピニオンギヤの圧入による歪みの発生を小さくするため、特許文献１では、モータシャフトの円柱部にピニオンギヤの円柱穴より大きい筋目ローレット部を備える構造とし、ピニオンギヤをモータシャフトの円柱部に圧入したとき、筋目ローレット部がピニオンギヤのフランジ部の円形穴部のみで固定されるような構成としている。
しかしながら、この構成では、ピニオンギヤにフランジ部を設けることが必須であり、そのため軸方向の長さが長くなってしまうという問題がある。逆に、軸方向の長さを短くするためフランジ部の長さを短くすると、圧入部が小さくなってしまい、圧入強度が小さくなり、モータシャフトとピニオンギヤの固定強度が小さくなるという問題がある。 In the prior art disclosed in Patent Document 1, a cylindrical portion is provided on the motor shaft side, a circular hole is provided on the pinion gear side, and both are fitted to fix the motor shaft and the pinion gear. There is a problem that distortion due to the above occurs easily.
In order to reduce the occurrence of distortion due to the press-fitting of the pinion gear, in Patent Document 1, the cylindrical portion of the motor shaft is provided with a structure knurled portion larger than the cylindrical hole of the pinion gear, and when the pinion gear is press-fitted into the cylindrical portion of the motor shaft, The streak knurled portion is configured to be fixed only by the circular hole portion of the flange portion of the pinion gear.
However, in this configuration, it is essential to provide the pinion gear with a flange portion, and there is a problem that the axial length becomes long. Conversely, if the length of the flange portion is shortened in order to shorten the axial length, the press-fit portion becomes small, the press-fit strength becomes small, and the fixing strength of the motor shaft and the pinion gear becomes small.

本発明は、こうした従来の問題点を解決し、モータシャフトとピニオンギヤの固定強度が高く、かつ軸方向長さも短くなるようなモータシャフトとピニオンギヤの固定構造を提供することを目的とする。
本発明の他の目的は、モータシャフトとピニオンギヤとの嵌合によって、モータシャフトの外周部を膨張させることによって、モータの出力軸側の軸受けが軸方向に移動することを防止し、該軸受けの固定強度をより強くすることにある。
さらに本発明の他の目的は、前記固定構造を備えたギヤードモータを提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a motor shaft and pinion gear fixing structure that solves these conventional problems and has a high fixing strength between the motor shaft and the pinion gear and a short axial length.
Another object of the present invention is to prevent the bearing on the output shaft side of the motor from moving in the axial direction by expanding the outer periphery of the motor shaft by fitting the motor shaft and the pinion gear. The purpose is to increase the fixing strength.
Furthermore, the other object of this invention is to provide the geared motor provided with the said fixing structure.

本発明は、上記課題を解決するため、ピニオンギヤをモータシャフトに備えたモータのモータシャフトとピニオンギヤの固定構造において、前記モータシャフトの先端部中心軸線上に軸方向の孔部を形成し、かつ前記ピニオンギヤの中心に軸方向の軸部を突設し、該軸部の外径がモータシャフトの孔部の内径より大きく形成され、前記軸部を前記モータシャフトの孔部に圧入して前記モータシャフトに前記ピニオンギヤを固定し、
前記ピニオンギヤの軸部を前記モータのモータシャフトに形成した孔部に圧入することによって前記孔部の周壁を、外周側に拡張させ、該モータのモータシャフト先端部を回動可能に支持する軸受けの離脱を防ぐことことにある。
また、本発明は、モータに歯車減速機を一体に組付け、モータシャフトの先端部を前記減速機のギヤケース内に導入し、モータシャフトの先端部に装着されたピニオンギヤを前記ギヤケース内の歯車機構に噛合させて減速するギヤードモータであって、モータケース内のモータシャフトの先端部中心軸線上に軸方向の孔部を形成し、中心に外径が前記モータシャフトの孔部の内径より大きい軸部を軸方向に突設したピニオンギヤを、前記軸部を前記モータシャフトの孔部に圧入して組付けるとともに、該ピニオンギヤを、前記減速機のギヤケース内に組み付けられた歯車機構に噛合させて、減速した回転を取り出すようにしたことにある。
さらに、前記モータシャフトと減速機の出力軸を同一軸線上に配置し、前記ピニオンギヤを太陽歯車とする遊星歯車機構を前記ギヤケース内に配設したことにある。 In order to solve the above-mentioned problems, the present invention provides a motor shaft and pinion gear fixing structure of a motor having a pinion gear on the motor shaft, wherein an axial hole is formed on the center axis of the tip of the motor shaft, and A shaft portion in the axial direction projects from the center of the pinion gear, the outer diameter of the shaft portion is formed larger than the inner diameter of the hole portion of the motor shaft, and the shaft portion is press-fitted into the hole portion of the motor shaft. The pinion gear is fixed to
The shaft of the pinion gear is press-fitted into a hole formed in the motor shaft of the motor, thereby expanding the peripheral wall of the hole to the outer peripheral side, and a bearing that rotatably supports the motor shaft tip of the motor. It is to prevent withdrawal .
The present invention also provides a gear reducer integrally assembled with the motor, the tip of the motor shaft is introduced into the gear case of the reducer, and a pinion gear attached to the tip of the motor shaft is connected to the gear mechanism in the gear case. A geared motor that meshes with the motor and decelerates, wherein an axial hole is formed on the central axis of the front end of the motor shaft in the motor case, and the outer diameter is larger than the inner diameter of the hole of the motor shaft at the center. A pinion gear having a protruding portion in the axial direction is assembled by press-fitting the shaft portion into the hole of the motor shaft, and the pinion gear is engaged with a gear mechanism assembled in the gear case of the speed reducer, This is because the decelerated rotation is taken out.
Further, the planetary gear mechanism in which the motor shaft and the output shaft of the speed reducer are arranged on the same axis and the pinion gear is a sun gear is arranged in the gear case.

請求項１に記載の本発明のモータシャフトとピニオンギヤの固定構造によれば、モータシャフトとピニオンギヤとを強固に固定できると共に、軸方向の寸法を短くできる。
また、モータシャフトとピニオンギヤとの嵌合によって、モータシャフトの外周部を拡張させ、モータの出力軸側の軸受けの内輪部をより強固に固定させることができる。
さらに、請求項２に記載の本発明によれば、ギヤケースの軸方向の寸法を短縮させて減速機を組付けることができるので、ギヤードモータの小型化を図ることができる。
またさらに、請求項３に記載の本発明によれば、モータシャフトと減速機の出力軸を同一軸線上に配置して、出力を取り出せるので、他の機器に対するレイアウトが容易である。 According to the fixing structure of the motor shaft and the pinion gear according to the first aspect of the present invention, the motor shaft and the pinion gear can be firmly fixed and the axial dimension can be shortened.
Further, by fitting the motor shaft and the pinion gear, the outer peripheral portion of the motor shaft can be expanded, and the inner ring portion of the bearing on the output shaft side of the motor can be more firmly fixed.
Furthermore, according to the second aspect of the present invention, since the reduction gear can be assembled by reducing the axial dimension of the gear case, the geared motor can be miniaturized.
Furthermore, according to the third aspect of the present invention, the motor shaft and the output shaft of the speed reducer are arranged on the same axis and the output can be taken out, so that the layout for other devices is easy.

以下、本発明の実施の形態を、図面を参照しながら詳細に説明する。
図１は本発明のモータシャフトとピニオンギヤの固定構造を有するギヤードモータを示す断面図、図２は図１の部分拡大断面図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing a geared motor having a structure for fixing a motor shaft and a pinion gear according to the present invention, and FIG. 2 is a partially enlarged sectional view of FIG.

図１において、ギヤードモータ１０は、モータ本体２０と減速機３０で構成されている。モータ２０は、ハウジング２１とフランジ２２でモータケース２３を構成し、減速機３０は、後述する遊星歯車機構を内蔵したギヤケース３１で構成されている。   In FIG. 1, the geared motor 10 includes a motor body 20 and a speed reducer 30. The motor 20 comprises a motor case 23 with a housing 21 and a flange 22, and the speed reducer 30 comprises a gear case 31 incorporating a planetary gear mechanism described later.

前記モータケース２３内には、軸線上にモータシャフト２４が回転自在に支持されており、モータシャフト２４を支持する軸受け２５，２６が前記フランジ２２とボス部２７に設けられている。モータシャフト２４は、回転子巻線が施されて回転子を構成し、図示しない固定子との間で回転磁界を発生して回転駆動されるものである。   A motor shaft 24 is rotatably supported on the axis within the motor case 23, and bearings 25 and 26 that support the motor shaft 24 are provided on the flange 22 and the boss portion 27. The motor shaft 24 is provided with a rotor winding to constitute a rotor, and is rotated by generating a rotating magnetic field with a stator (not shown).

前記モータシャフト２４の先端部２４ａは、前記ギヤケース３１内に延出されており、このモータシャフト２４の先端部中心軸線上には、軸方向の孔部２８が形成されている。   A front end 24 a of the motor shaft 24 extends into the gear case 31, and an axial hole 28 is formed on the center axis of the front end of the motor shaft 24.

前記モータシャフト２４の孔部２８には、図２に示すようにモータシャフト２４先端部２４ａの外径と略等しい外径のピニオンギヤ４０が軸部４１を介して装着されている。ピニオンギヤ４０の軸部４１は、ピニオンギヤ４０の中心に軸方向に突出して設けられたもので、前記モータシャフト２４の孔部２８の内径より軸部４１の外径が僅かに大きく形成されている。前記モータシャフト２４の孔部２８は、ピニオンギヤ４０の軸部４１を圧入することで、周囲の壁面２９が僅かに拡張して、前記モータシャフト２４の先端部２４ａを支持する軸受け２５の内輪２５ａ側内周面に密着するように形成されている。ピニオンギヤ４０の外径は、モータシャフト２４の外径よりも大きくても、小さくても良く、ピニオンギヤ４０に設けられた歯数と、ピニオンギヤ４０に噛み合うギヤの歯数とのギヤ比を考慮して設定されている。   As shown in FIG. 2, a pinion gear 40 having an outer diameter substantially equal to the outer diameter of the tip 24 a of the motor shaft 24 is attached to the hole portion 28 of the motor shaft 24 through a shaft portion 41. The shaft portion 41 of the pinion gear 40 is provided so as to protrude in the axial direction at the center of the pinion gear 40, and the outer diameter of the shaft portion 41 is slightly larger than the inner diameter of the hole portion 28 of the motor shaft 24. The hole portion 28 of the motor shaft 24 is formed by press-fitting the shaft portion 41 of the pinion gear 40 so that the surrounding wall surface 29 slightly expands, and the inner ring 25a side of the bearing 25 that supports the tip portion 24a of the motor shaft 24 is supported. It is formed so as to be in close contact with the inner peripheral surface. The outer diameter of the pinion gear 40 may be larger or smaller than the outer diameter of the motor shaft 24, taking into consideration the gear ratio between the number of teeth provided on the pinion gear 40 and the number of teeth of the gear meshing with the pinion gear 40. Is set.

前記減速機３０のギヤケース３１には、ピニオンギヤ４０の回転を減速して出力軸５０に伝達する遊星歯車機構６０が内蔵されている。この遊星歯車機構６０は、ピニオンギヤ４０を太陽歯車とし、このピニオンギヤ４０に噛み合う遊星歯車６１がギヤケース３１内壁面に取付けられた外輪歯車６２に噛み合いながら公転運動するとともに、遊星歯車６１を支持する遊星キャリア６３に対して自転運動するものである。外輪歯車６２は、外輪歯車６２の周縁に沿って軸方向に設けられたねじ孔６２ａに螺合するねじ６４を介してギヤケース３１に固定されている。また、前記遊星キャリア６３は、出力軸５０に設けられた円板５１の周縁部に支持されており、遊星歯車６１の公転運動を円板５１を通して出力軸５０に伝達し、出力軸５０から回転を取り出すものである。出力軸５０および円板５１は、ギヤケース３１内に装着された軸受け３２，３３を介してそれぞれ回転自在にギヤケース３１に支持されており、ギヤケース３１の外部に導出した出力軸５０の先端部から減速した回転を取り出すようにしている。ピニオンギヤ４０の歯数をａとし、外輪歯車６２の歯数をｃとすると、ａ+ｃ／ａの歯数比に減速された回転が取り出されることになる。   The gear case 31 of the speed reducer 30 incorporates a planetary gear mechanism 60 that decelerates the rotation of the pinion gear 40 and transmits it to the output shaft 50. The planetary gear mechanism 60 uses the pinion gear 40 as a sun gear, and the planetary gear 61 meshing with the pinion gear 40 revolves while meshing with the outer ring gear 62 attached to the inner wall surface of the gear case 31 and also supports the planetary gear 61. It rotates with respect to 63. The outer ring gear 62 is fixed to the gear case 31 via a screw 64 that is screwed into a screw hole 62 a provided in the axial direction along the periphery of the outer ring gear 62. Further, the planet carrier 63 is supported on a peripheral portion of a disc 51 provided on the output shaft 50, transmits the revolution movement of the planetary gear 61 to the output shaft 50 through the disc 51, and rotates from the output shaft 50. To take out. The output shaft 50 and the disc 51 are rotatably supported by the gear case 31 via bearings 32 and 33 mounted in the gear case 31, respectively, and decelerate from the front end portion of the output shaft 50 led out of the gear case 31. I try to take out the rotation. Assuming that the number of teeth of the pinion gear 40 is a and the number of teeth of the outer ring gear 62 is c, the rotation reduced to the gear number ratio of a + c / a is taken out.

前記ピニオンギヤ４０、遊星歯車６１、外輪歯車６２は、ピニオンギヤ４０を中心とする同心円状に配置され、遊星キャリア６３に軸受け６５を介して回転自在に支持された遊星歯車６１が、ピニオンギヤ４０の周囲を自転しながら公転運動するもので、ピニオンギヤ４０と出力軸５０が減速機３０の中心線上に対向して配置されている。   The pinion gear 40, the planetary gear 61, and the outer ring gear 62 are arranged concentrically around the pinion gear 40, and the planetary gear 61 that is rotatably supported by the planetary carrier 63 via the bearing 65 is disposed around the pinion gear 40. The revolving motion is performed while rotating, and the pinion gear 40 and the output shaft 50 are disposed on the center line of the speed reducer 30 so as to face each other.

前記モータシャフトとピニオンギヤの固定構造によると、モータシャフト２４の先端中心軸線上に、軸方向の孔部２８を形成し、この孔部２８にピニオンギヤ４０の軸部４１を圧入したので、モータシャフト２４の先端部２４ａの軸方向長さを短縮することができる。また、ピニオンギヤ４０の軸部４１の圧入によってモータシャフト２４の孔部２８の周壁２９を、外周側に拡張させているので、モータシャフト２４の先端部２４ａを回動可能に支持する軸受け２５のピニオンギヤ４０側への離脱を防ぐことができる。したがって、モータに減速機を組み付けたギヤードモータにおいても、ギヤケース３１の軸方向の寸法を短縮させて減速機３０を組付けることができるので、ギヤードモータの小型化を図ることができる。モータシャフト２４と減速機３０の出力軸５０を同一軸線上に配置して、出力を取り出せるので、他の機器に対するレイアウトが容易である。   According to the fixing structure of the motor shaft and the pinion gear, the axial hole portion 28 is formed on the tip central axis of the motor shaft 24, and the shaft portion 41 of the pinion gear 40 is press-fitted into the hole portion 28. It is possible to shorten the axial length of the distal end portion 24a. Further, since the peripheral wall 29 of the hole portion 28 of the motor shaft 24 is expanded to the outer peripheral side by press-fitting the shaft portion 41 of the pinion gear 40, the pinion gear of the bearing 25 that rotatably supports the tip portion 24a of the motor shaft 24. Separation to the 40 side can be prevented. Therefore, even in a geared motor in which a reduction gear is assembled to the motor, the reduction gear 30 can be assembled by shortening the axial dimension of the gear case 31, so that the geared motor can be reduced in size. Since the motor shaft 24 and the output shaft 50 of the speed reducer 30 are arranged on the same axis and the output can be taken out, layout for other devices is easy.

なお、本発明は、前記実施の形態のみに限定されるものではなく、例えば、ピニオンギヤ４０の軸部４１には、先端にローレット加工を施しても良く、また、ピニオンギヤ４０の材質とモータシャフト２４の材質に異なる金属を用いてモータシャフト２４の孔部２８の周壁２９を拡張させても良い。また、軸受け２５と孔部２８の位置関係は、図１のように軸受け２５の端部と孔部８の先端をほぼ一致させても良く、あるいは図２のように、軸受け２５の内輪２５ａと重なるように孔部２８を深く形成しても良い。など、その他、本発明の要旨を変更しない範囲内で適宜変更して実施しうることは言うまでもない。   The present invention is not limited to the above-described embodiment. For example, the shaft portion 41 of the pinion gear 40 may be knurled at the tip, and the material of the pinion gear 40 and the motor shaft 24 may be provided. The peripheral wall 29 of the hole portion 28 of the motor shaft 24 may be expanded using a different metal. Further, the positional relationship between the bearing 25 and the hole 28 may be such that the end of the bearing 25 and the tip of the hole 8 are substantially coincided as shown in FIG. 1, or the inner ring 25a of the bearing 25 as shown in FIG. The hole 28 may be formed deep so as to overlap. In addition, it goes without saying that the present invention can be appropriately modified and implemented without departing from the scope of the present invention.

本発明のモータシャフトとピニオンギヤの固定構造を有するギヤードモータを示す図である。It is a figure which shows the geared motor which has the fixing structure of the motor shaft and pinion gear of this invention. 図１の部分拡大断面図である。It is a partial expanded sectional view of FIG.

符号の説明Explanation of symbols

１０ ギヤードモータ
２０ モータ本体
２１ ハウジング
２２ フランジ
２３ モータケース
２４ モータシャフト
２４ａ 先端部
２５，２６ 軸受け
２７ ボス部
２８ 孔部
２９ 壁面
３０ 減速機
３１ ギヤケース
３２，３３ 軸受け
４０ ピニオンギヤ（太陽歯車）
４１ 軸部
５０ 出力軸
５１ 円板
６０ 遊星歯車機構
６１ 遊星歯車
６２ 外輪歯車
６３ 遊星キャリア DESCRIPTION OF SYMBOLS 10 Geared motor 20 Motor main body 21 Housing 22 Flange 23 Motor case 24 Motor shaft 24a Tip part 25, 26 Bearing 27 Boss part 28 Hole part 29 Wall surface 30 Reduction gear 31 Gear case 32, 33 Bearing 40 Pinion gear (sun gear)
41 Shaft 50 Output Shaft 51 Disc 60 Planetary Gear Mechanism 61 Planetary Gear 62 Outer Ring Gear 63 Planetary Carrier

Claims (3)

ピニオンギヤをモータシャフトに備えたモータのモータシャフトとピニオンギヤの固定構造において、
前記モータシャフトの先端部中心軸線上に軸方向の孔部を形成し、かつ前記ピニオンギヤの中心に軸方向の軸部を突設し、
該軸部の外径がモータシャフトの孔部の内径より大きく形成され、
前記軸部を前記モータシャフトの孔部に圧入して前記モータシャフトに前記ピニオンギヤを固定し、
前記ピニオンギヤの軸部を前記モータのモータシャフトに形成した孔部に圧入することによって前記孔部の周壁を、外周側に拡張させ、該モータのモータシャフト先端部を回動可能に支持する軸受けの離脱を防ぐことを特徴とするモータシャフトとピニオンギヤの固定構造。 In the fixing structure of the motor shaft and pinion gear of the motor equipped with the pinion gear on the motor shaft,
Forming an axial hole on the central axis of the tip of the motor shaft, and projecting an axial shaft at the center of the pinion gear;
The outer diameter of the shaft is formed larger than the inner diameter of the hole of the motor shaft,
The shaft portion is press-fitted into the hole of the motor shaft to fix the pinion gear to the motor shaft,
The shaft of the pinion gear is press-fitted into a hole formed in the motor shaft of the motor, thereby expanding the peripheral wall of the hole to the outer peripheral side, and a bearing that rotatably supports the motor shaft tip of the motor. Motor shaft and pinion gear fixing structure characterized by preventing separation . モータに歯車減速機を一体に組付け、モータシャフトの先端部を前記減速機のギヤケース内に導入し、モータシャフトの先端部に装着されたピニオンギヤを前記ギヤケース内の歯車機構に噛合させて減速するギヤードモータであって、
モータケース内のモータシャフトの先端部中心軸線上に軸方向の孔部を形成し、
中心に外径が前記モータシャフトの孔部の内径より大きい軸部を軸方向に突設したピニオンギヤを、前記軸部を前記モータシャフトの孔部に圧入して組付けるとともに、該ピニオンギヤを、前記減速機のギヤケース内に組み付けられた歯車機構に噛合させて、減速した回転を取り出すようにしたことを特徴とするギヤードモータ。 A gear reducer is assembled integrally with the motor, the tip of the motor shaft is introduced into the gear case of the reducer, and the pinion gear attached to the tip of the motor shaft is engaged with the gear mechanism in the gear case to reduce the speed. A geared motor,
An axial hole is formed on the central axis of the tip of the motor shaft in the motor case,
A pinion gear having an axially projecting shaft portion whose outer diameter is larger than the inner diameter of the hole portion of the motor shaft in the axial direction is assembled by press-fitting the shaft portion into the hole portion of the motor shaft. A geared motor characterized in that it is engaged with a gear mechanism assembled in a gear case of a reduction gear so as to take out a reduced speed rotation. 前記モータシャフトと減速機の出力軸を同一軸線上に配置し、前記ピニオンギヤを太陽歯車とする遊星歯車機構を前記ギヤケース内に配設したことを特徴とする請求項２に記載のギヤードモータ。 3. The geared motor according to claim 2, wherein a planetary gear mechanism in which the motor shaft and the output shaft of the speed reducer are arranged on the same axis and the pinion gear is a sun gear is arranged in the gear case.
JP2008191842A 2008-07-25 2008-07-25 Structure for fixing motor shaft and pinion gear, and geared motor having the structure Active JP5339806B2 (en)

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