JP2016101088A - motor - Google Patents

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JP2016101088A
JP2016101088A JP2015224972A JP2015224972A JP2016101088A JP 2016101088 A JP2016101088 A JP 2016101088A JP 2015224972 A JP2015224972 A JP 2015224972A JP 2015224972 A JP2015224972 A JP 2015224972A JP 2016101088 A JP2016101088 A JP 2016101088A
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Prior art keywords
resin
output shaft
motor
gear
main body
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慶国 覃
Qing Guo Qin
慶国 覃
西村　清志
Kiyoshi Nishimura
清志 西村
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Nidec Sankyo Electronics Dongguan Corp
Nidec Instruments Corp
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Nidec Sankyo Electronics Dongguan Corp
Nidec Sankyo Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a motor capable of securing the strength of the whole output shaft, reducing a vibration noise, and suppressing a sliding loss of the output shaft.SOLUTION: A motor 1 comprises: a motor main body part 10; an output shaft S; a deceleration gear part 20; a case main body 310; and an end plate 320 formed with a bearing part 321 that rotatably supports the output shaft S. The output shaft S comprises: a resin cylindrical part ST that configures a bearing surface sliding with the bearing part 321 of the end plate 320; a resin gear part SC engaged with an output side gear 211 of the deceleration gear part 20; and a metal shaft part SZ formed integrally with the cylindrical part ST and the gear part SC. The shaft part SZ has: a first portion P1 overlapped with the cylindrical part ST in a radial direction; and a second portion P2 that protrudes from the cylindrical part ST to the other side in an axial direction. A boundary part J between the second portion P2 and the cylindrical part ST is provided radially inside an outer peripheral edge of the cylindrical part ST.SELECTED DRAWING: Figure 2

Description

本発明は、モータに関し、特に、減速歯車部を備えるモータに関する。   The present invention relates to a motor, and more particularly to a motor including a reduction gear unit.

従来、モータ本体部と、出力軸と、モータ本体部の動力を減速して出力軸に伝達する複数の歯車を備えた減速歯車部と、モータ本体部と減速歯車部が収容されるケース本体と、ケース本体の一端を塞ぐようにケース本体に固定され、出力軸を回転可能に支持する軸受部が形成されている端板とを備えるモータが知られている（特許文献１参照）。モータにおいて、出力軸として、全体が樹脂からなるものが良く使われている。   Conventionally, a motor main body portion, an output shaft, a reduction gear portion including a plurality of gears that reduce the power of the motor main body portion and transmit it to the output shaft, a case main body in which the motor main body portion and the reduction gear portion are accommodated, A motor is known that includes an end plate that is fixed to a case body so as to close one end of the case body and that has a bearing portion that rotatably supports an output shaft (see Patent Document 1). In motors, an output shaft made of resin as a whole is often used.

特開２０１３−１３２０９０号公報JP 2013-1332090 A

しかしながら、モータの小型化が要求され、出力軸の直径が小さくなる場合、樹脂製の出力軸は、実際の使用において強度の不足により破損する可能性が高い。   However, when downsizing of the motor is required and the diameter of the output shaft is reduced, the resin-made output shaft is likely to be damaged due to insufficient strength in actual use.

そこで、強度不足による出力軸の破損を回避するために、従来、図９に示すような出力軸を採用することがある。この種の出力軸は、一体に形成された金属製の軸部ＳＺ０と樹脂製の筒部ＳＴ０とを備えており、金属製の軸部は、その軸線Ｌ’方向における中間部に、環状のフランジＳＺ０１を複数備えている。樹脂製の筒部ＳＴ０は、金属製の軸部の軸線Ｌ’方向における中間部を包囲するように形成され、ケース本体の一端を塞ぐ端板の軸受部と摺動する軸受面を構成している。また、金属製の軸部ＳＺ０は、樹脂製の筒部ＳＴ０と軸線Ｌ’方向において隣接する部分の外径が、樹脂製の筒部ＳＴ０の外径と同じである（図９における寸法ＷＬを参照）。   In order to avoid damage to the output shaft due to insufficient strength, an output shaft as shown in FIG. This type of output shaft includes an integrally formed metal shaft portion SZ0 and a resin tube portion ST0, and the metal shaft portion has an annular shape at an intermediate portion in the direction of the axis L ′. A plurality of flanges SZ01 are provided. The resin cylinder portion ST0 is formed so as to surround an intermediate portion of the metal shaft portion in the direction of the axis L ′, and constitutes a bearing surface that slides with a bearing portion of an end plate that closes one end of the case body. Yes. Further, in the metal shaft portion SZ0, the outer diameter of the portion adjacent to the resin tube portion ST0 in the axis L ′ direction is the same as the outer diameter of the resin tube portion ST0 (the dimension WL in FIG. reference).

しかしながら、図９に示す出力軸を採用した場合、実際の使用時に出力軸がその軸線方向において移動する可能性があることや、製造・組付の誤差などにより、金属製の軸部において樹脂製の筒部と軸線方向において隣接する部分が、端板に形成された軸受部に接触し、振動ノイズが発生しやすい。また、樹脂製の筒部の成形時に該樹脂製の筒部と金属製の軸部との境界で発生するバリにより、軸の摺動ロスを招きやすい。   However, when the output shaft shown in FIG. 9 is adopted, there is a possibility that the output shaft may move in the axial direction during actual use, or due to manufacturing / assembly errors, etc., the resin shaft is made of resin. A portion adjacent to the cylindrical portion in the axial direction comes into contact with the bearing portion formed on the end plate, and vibration noise is likely to occur. In addition, a sliding loss of the shaft tends to be caused by burrs generated at the boundary between the resin cylindrical portion and the metal shaft portion when the resin cylinder portion is molded.

上記問題点に鑑みて、本発明の課題は、出力軸の全体の強度を確保できるとともに、振動ノイズを低減できるとともに、出力軸の摺動ロスを抑制できるモータを提供することにある。   In view of the above problems, an object of the present invention is to provide a motor that can ensure the overall strength of the output shaft, reduce vibration noise, and suppress sliding loss of the output shaft.

上記課題を解決するために、本発明の第１態様のモータは、
モータ本体部と、出力軸と、前記モータ本体部の動力を減速して前記出力軸に伝達する少なくとも一つの歯車を備えた減速歯車部と、前記モータ本体部と前記減速歯車部が収容されるケース本体と、前記ケース本体の一端を塞ぐように前記ケース本体に固定され、前記出力軸を回転可能に支持する軸受部が形成されている端板と、を備えるモータにおいて、
前記出力軸は、
前記出力軸の軸線方向に延伸するとともに、前記端板の前記軸受部と摺動する軸受面を
構成する樹脂製の筒部と、
前記樹脂製の筒部の前記軸線方向における一方側に形成され、前記少なくとも一つの歯車のうちの出力側歯車に噛み合う樹脂製の歯車部と、
前記樹脂製の筒部及び前記樹脂製の歯車部と一体的に形成されており、前記軸線方向に垂直する径方向において前記樹脂製の筒部に径方向の内側で重なる第１部分、および前記樹脂製の筒部から前記軸線方向における他方側へ突出する第２部分を有する金属製の軸部と、
を備え、
前記第２部分と前記樹脂製の筒部との境界部は、前記樹脂製の筒部の外周縁よりも径方向の内側にあることを特徴とする。 In order to solve the above-described problem, the motor according to the first aspect of the present invention includes:
A motor main body portion, an output shaft, a reduction gear portion including at least one gear for reducing the power of the motor main body portion and transmitting it to the output shaft, and the motor main body portion and the reduction gear portion are accommodated. In a motor comprising: a case main body; and an end plate that is fixed to the case main body so as to close one end of the case main body and that has a bearing portion that rotatably supports the output shaft.
The output shaft is
A resin-made cylindrical portion that extends in the axial direction of the output shaft and constitutes a bearing surface that slides with the bearing portion of the end plate;
A resin gear portion that is formed on one side in the axial direction of the resin cylinder portion and meshes with an output side gear of the at least one gear;
A first portion that is integrally formed with the resin cylinder portion and the resin gear portion, and overlaps the resin cylinder portion in the radial direction in a radial direction perpendicular to the axial direction; and A metal shaft portion having a second portion protruding from the resin tube portion to the other side in the axial direction;
With
A boundary portion between the second portion and the resin tube portion is located on an inner side in a radial direction with respect to an outer peripheral edge of the resin tube portion.

ここで、「軸線方向に垂直する径方向において樹脂製の筒部と重なる」とは、軸線方向に垂直する径方向に沿って見る際に樹脂製の筒部と重なることを意味する。   Here, “overlap with the resin cylinder in the radial direction perpendicular to the axial direction” means that it overlaps with the resin cylinder when viewed along the radial direction perpendicular to the axial direction.

本発明の第１態様のモータによれば、出力軸は、樹脂製の筒部と、樹脂製の歯車部と、該樹脂製の筒部及び樹脂製の歯車部と一体に形成された金属製の軸部とを備え、金属製の軸部は、軸線方向に垂直する径方向において前記樹脂製の筒部と重なる第１部分と、前記樹脂製の筒部から前記軸線方向における他方側へ突出する第２部分とを有するので、全体が樹脂からなる従来の出力軸に比べて、出力軸の全体の強度を効果的に向上させることが可能となる。また、金属製の軸部の第２部分と樹脂製の筒部との境界部は、樹脂製の筒部の外周縁よりも内側にあるので、たとえ出力軸がその軸線方向に移動したり、製造・組付け誤差が発生したりして、金属製の軸部が軸線方向に垂直する径方向から見て端板の軸受部と重なる位置まで移動しても、金属製の軸部は、端板の軸受部と接触することがなく、金属製の軸部の第２部分と端板に形成された軸受部との接触により振動ノイズが発生することを回避できる。また、たとえ樹脂製の筒部の成形時に該樹脂製の筒部と金属製の軸部の第２部分との境界でバリが発生しても、出力軸の摺動ロスを招くことが無い。   According to the motor of the first aspect of the present invention, the output shaft is made of a metal that is formed integrally with a resin-made cylinder part, a resin-made gear part, and the resin-made cylinder part and the resin-made gear part. The metal shaft portion protrudes from the resin tube portion to the other side in the axial direction, the first portion overlapping the resin tube portion in the radial direction perpendicular to the axial direction. Therefore, the overall strength of the output shaft can be effectively improved as compared with the conventional output shaft made entirely of resin. Moreover, since the boundary part between the second part of the metal shaft part and the resin cylinder part is inside the outer peripheral edge of the resin cylinder part, even if the output shaft moves in the axial direction, Even if a manufacturing / assembly error occurs and the metal shaft moves to a position where it overlaps with the bearing portion of the end plate when viewed from the radial direction perpendicular to the axial direction, the metal shaft It is possible to avoid occurrence of vibration noise due to contact between the second portion of the metal shaft portion and the bearing portion formed on the end plate without contact with the bearing portion of the plate. Further, even if burrs are generated at the boundary between the resin cylinder portion and the second portion of the metal shaft portion when the resin cylinder portion is molded, there is no sliding loss of the output shaft.

本発明の第２態様のモータは、上記第１態様のモータにおいて、前記第１部分は、大径部と、該大径部より小径の接続部とを備え、前記大径部と接続部とは、前記軸線方向において繋がっており、前記接続部は、前記第２部分に繋がっており、前記大径部と接続部との間に形成された段差面の全体は、前記樹脂製の筒部によって覆われている。   The motor according to a second aspect of the present invention is the motor according to the first aspect, wherein the first portion includes a large-diameter portion and a connection portion having a smaller diameter than the large-diameter portion, and the large-diameter portion and the connection portion. Are connected in the axial direction, the connecting portion is connected to the second portion, and the entire step surface formed between the large-diameter portion and the connecting portion is the resin cylindrical portion. Covered by.

本発明の第２態様のモータによれば、樹脂製の筒部の成形時に該樹脂製の筒部と金属製の軸部の第２部分との境界で発生するバリによる出力軸の摺動ロスを回避するのに、一層有利である。   According to the motor of the second aspect of the present invention, the sliding loss of the output shaft due to the burr generated at the boundary between the resin tube portion and the second portion of the metal shaft portion when the resin tube portion is molded. It is more advantageous to avoid this.

本発明の第３態様のモータは、上記第１または第２態様のモータにおいて、前記樹脂製の筒部は、少なくとも前記軸受部の内周面に径方向の内側で重なる前記第１部分の外周面を覆っている。   The motor according to a third aspect of the present invention is the motor according to the first or second aspect, wherein the cylindrical portion made of resin overlaps at least the inner peripheral surface of the bearing portion on the inner side in the radial direction. Covers the surface.

本発明の第３態様のモータによれば、金属製の軸部と端板に形成された軸受部との接触により振動ノイズが発生することをより効果的に回避できる。   According to the motor of the third aspect of the present invention, it is possible to more effectively avoid the generation of vibration noise due to the contact between the metal shaft portion and the bearing portion formed on the end plate.

本発明の第４態様のモータは、上記第３態様のモータにおいて、前記樹脂製の筒部は、前記第１部分の外周面の全体を覆っている。   The motor according to a fourth aspect of the present invention is the motor according to the third aspect, wherein the resin cylindrical portion covers the entire outer peripheral surface of the first portion.

本発明の第４態様のモータによれば、樹脂製の筒部の形成が容易になる。   According to the motor of the fourth aspect of the present invention, it is easy to form a resin cylinder.

本発明の第５態様のモータは、上記第１態様のモータにおいて、前記第１部分の外径は、前記軸線方向において同じである。   The motor according to a fifth aspect of the present invention is the motor according to the first aspect, wherein the outer diameter of the first portion is the same in the axial direction.

本発明の第５態様のモータによれば、金属製の軸部の第１部分の外径が出力軸の軸線方向において同じであるため、金属製の軸部の軸線方向中間部に複数のフランジが形成された場合に比べて、たとえ樹脂製の筒部が成形の冷却時に出力軸の径方向において収縮したとしても、軸線方向の全体において収縮後の樹脂製の筒部の外径の均一性を確保するのに有利であり、樹脂製の筒部と端板の軸受部とが軸線方向において不均一に接触することにより振動ノイズや出力軸の摺動ロスが発生するのを回避するのに有利である。   According to the motor of the fifth aspect of the present invention, since the outer diameter of the first portion of the metal shaft portion is the same in the axial direction of the output shaft, a plurality of flanges are provided at the axial direction intermediate portion of the metal shaft portion. Even if the resin cylinder part shrinks in the radial direction of the output shaft when cooling the molding, the outer diameter uniformity of the resin cylinder part after shrinkage is reduced in the whole axial direction compared to the case where is formed To avoid vibration noise and output shaft sliding loss due to non-uniform contact between the resin cylinder and the end plate bearing in the axial direction. It is advantageous.

本発明によれば、出力軸の全体の強度を確保できるとともに、振動ノイズを低減でき、出力軸の摺動ロスを抑制できるモータを提供することが可能となる。   According to the present invention, it is possible to provide a motor that can ensure the overall strength of the output shaft, reduce vibration noise, and suppress sliding loss of the output shaft.

本発明の実施形態にかかるモータの全体構造を示す斜視図である。1 is a perspective view showing an overall structure of a motor according to an embodiment of the present invention. 図１に示すモータの内部構造を説明するための縦方向断面図である。FIG. 2 is a longitudinal sectional view for explaining the internal structure of the motor shown in FIG. 1. 本発明の実施形態にかかるモータの各内部部材の概略構造を概略的に示す分解図である。It is an exploded view showing roughly the schematic structure of each internal member of the motor concerning the embodiment of the present invention. 本発明の実施形態にかかるモータの出力軸の構造を示す斜視図である。It is a perspective view which shows the structure of the output shaft of the motor concerning embodiment of this invention. 図４に示すモータの出力軸の構造を示す縦方向断面図である。FIG. 5 is a longitudinal sectional view showing the structure of the output shaft of the motor shown in FIG. 4. 本発明の実施形態にかかるモータの出力軸の変形例を示す斜視図である。It is a perspective view which shows the modification of the output shaft of the motor concerning embodiment of this invention. 図６に示すモータの出力軸の構造を示す縦方向断面図である。FIG. 7 is a longitudinal sectional view showing the structure of the output shaft of the motor shown in FIG. 6. 本発明の実施形態にかかるモータの出力軸の他の変形例を示す斜視図である。It is a perspective view which shows the other modification of the output shaft of the motor concerning embodiment of this invention. 従来技術のモータに採用された出力軸の構造を示す縦方向断面図である。It is longitudinal direction sectional drawing which shows the structure of the output shaft employ | adopted as the motor of the prior art.

以下、本発明の実施の形態にかかるモータ１について図面を参照して詳しく説明する。
また、以下の説明では、モータ１の出力軸Ｓが位置する側を「出力側」（出力軸の軸線Ｌ方向の他方側に対応）といい、上記出力側の反対側を「反出力側」（出力軸の軸線Ｌ方向の一方側に対応）という。 Hereinafter, a motor 1 according to an embodiment of the present invention will be described in detail with reference to the drawings.
Moreover, in the following description, the side where the output shaft S of the motor 1 is located is referred to as “output side” (corresponding to the other side of the output shaft in the axis L direction), and the opposite side of the output side is “anti-output side”. (It corresponds to one side of the axis L direction of the output shaft).

（モータの概略構造）
図１は、本発明の実施形態にかかるモータ１の全体の構造を示す斜視図である。図２は、図１に示すモータ１の内部構造を説明するための縦方向断面図である。図３は、本発明の実施形態にかかるモータ１の各内部部材の概略構造を概略的に示す分解図である。 (Schematic structure of the motor)
FIG. 1 is a perspective view showing the overall structure of a motor 1 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view for explaining the internal structure of the motor 1 shown in FIG. FIG. 3 is an exploded view schematically showing a schematic structure of each internal member of the motor 1 according to the embodiment of the present invention.

本実施形態にかかるモータ１は、減速機付きのステッピングモータであり、図１に示すように、略円柱状の外形を有している。また、図２および図３に示すように、該モータ１は、モータ本体部１０と、出力軸Ｓと、モータ本体部１０の動力を減速して出力軸Ｓに伝達する複数の歯車を有する減速歯車部２０と、モータ本体部１０及び減速歯車部２０が収容されるケース本体３１０、および端板３２０からなるケース３０と、モータ１の端子部を覆うカバー部材４０と、を備える。   The motor 1 according to this embodiment is a stepping motor with a reduction gear, and has a substantially cylindrical outer shape as shown in FIG. As shown in FIGS. 2 and 3, the motor 1 has a motor main body 10, an output shaft S, and a reduction gear having a plurality of gears that reduce the power of the motor main body 10 and transmit it to the output shaft S. A gear unit 20, a case main body 310 in which the motor main body unit 10 and the reduction gear unit 20 are accommodated, a case 30 including an end plate 320, and a cover member 40 that covers the terminal unit of the motor 1 are provided.

図２及び図３に示すように、モータ本体部１０は、回転軸１１１と回転軸１１１に固定された駆動用マグネット１１２とを有するロータ１１０と、ステータコア１２１とコイルボビン１２２とを有するステータ１２０と、を備えており、ステータコア１２１は、駆動用マグネット１１２の外周面に対向配置されたティース１２３Ａ、１２３Ｂを有し、コイルボビン１２２には、ティース１２３Ａ、１２３Ｂの外周側に配置された駆動用コイル１２４が巻き付けられている。   As shown in FIGS. 2 and 3, the motor body 10 includes a rotor 110 having a rotating shaft 111 and a driving magnet 112 fixed to the rotating shaft 111, a stator 120 having a stator core 121 and a coil bobbin 122, The stator core 121 has teeth 123A and 123B disposed opposite to the outer peripheral surface of the drive magnet 112, and the coil bobbin 122 has a drive coil 124 disposed on the outer peripheral side of the teeth 123A and 123B. It is wound.

図２及び図３に示すように、減速歯車部２０は、出力側歯車２１１を備えた複数の歯車
からなり回転軸１１１に接続される歯車列２１０と、歯車列２１０の各歯車を回転可能に支持するための支持軸２２１が固定された支持板２２０とを備える。 As shown in FIGS. 2 and 3, the reduction gear unit 20 is composed of a plurality of gears having an output side gear 211 and is connected to the rotation shaft 111, and each gear of the gear train 210 is rotatable. And a support plate 220 to which a support shaft 221 for supporting is fixed.

図１、図２及び図３に示すように、ケース３０では、ケース本体３１０が底部３１１と筒部３１２を有する略有底円筒状に形成され、筒部３１２には、端子部を配置するための切り欠き部３１３が形成されている。端板３２０は、ケース本体３１０の一端（図１における上端）を塞ぐようにケース本体３１０に固定されている。   As shown in FIGS. 1, 2, and 3, in the case 30, the case main body 310 is formed in a substantially bottomed cylindrical shape having a bottom portion 311 and a tubular portion 312, and a terminal portion is disposed on the tubular portion 312. The notch 313 is formed. The end plate 320 is fixed to the case body 310 so as to close one end (the upper end in FIG. 1) of the case body 310.

図３に示すように、ケース本体３１０の底部３１１には、上側に立ち上がるように複数のティース１２３が形成されている。   As shown in FIG. 3, a plurality of teeth 123 are formed on the bottom 311 of the case main body 310 so as to rise upward.

図２及び図３に示すように、ケース本体３１０の上端部には、底部３１１側へ凹むような略矩形形状の凹部３１４が形成されている。本実施形態では、凹部３１４は、周方向における三箇所に形成されている。凹部３１４は、端板３２０の凸部３２５及び二つの取り付け用突部３２４を配置するための部分であって、周方向における端板３２０の移動を防止するための周方向ストッパを構成する。   As shown in FIGS. 2 and 3, a substantially rectangular recess 314 that is recessed toward the bottom 311 is formed at the upper end of the case main body 310. In the present embodiment, the recesses 314 are formed at three locations in the circumferential direction. The concave portion 314 is a portion for arranging the convex portion 325 of the end plate 320 and the two mounting projections 324, and constitutes a circumferential stopper for preventing the movement of the end plate 320 in the circumferential direction.

図１及び図３に示すように、端板３２０は、平板状に形成され、端板３２０には、出力軸Ｓを回転可能に支持する軸受部３２１と、ケース本体３１０の底部３１１に設置された固定軸３１５を支持する軸支持部３２２と、支持軸２２１が嵌合する孔部３２３とが形成されている。さらに、図１及び図３に示すように、端板３２０には、ケース本体３１０の外周側へ突出するように二つの取り付け用突部３２４が形成され、この二つの取り付け用突部３２４は、モータ１を他の各種の設備に取り付けるために用いられている。また、端板３２０には、ケース本体３１０の上端部に形成された凹部３１４と嵌合する凸部３２５が形成されている。端板３２０には、支持板２２０の支持突起に形成された位置決め用突起２２３１と嵌合することで周方向での位置決めを行うための貫通孔３２６が更に形成されている。   As shown in FIGS. 1 and 3, the end plate 320 is formed in a flat plate shape. The end plate 320 is installed on a bearing portion 321 that rotatably supports the output shaft S and a bottom portion 311 of the case main body 310. A shaft support portion 322 for supporting the fixed shaft 315 and a hole portion 323 into which the support shaft 221 is fitted are formed. Further, as shown in FIGS. 1 and 3, the end plate 320 is formed with two attachment projections 324 so as to protrude toward the outer peripheral side of the case main body 310, and the two attachment projections 324 are It is used to attach the motor 1 to various other facilities. Further, the end plate 320 is formed with a convex portion 325 that fits into a concave portion 314 formed at the upper end portion of the case main body 310. The end plate 320 is further formed with a through hole 326 for positioning in the circumferential direction by fitting with a positioning projection 2231 formed on the support projection of the support plate 220.

図２及び図３に示すように、ステータ１２０は、出力軸Ｓの軸線（図５における符号Ｌを参照）方向において重ねて配置された二つのステータ組を備え、各ステータ組は、ステータコア１２１（アウターステータコア１２１Ａとインナーステータコア１２１Ｂ）が軸線Ｌ方向に対向するように配置されている。アウターステータコア１２１Ａとインナーステータコア１２１Ｂとは、何れも、円環状のフランジ部１２１１Ａ、１２１１Ｂと、フランジ部１２１１Ａ、１２１１Ｂの内周縁から軸線Ｌ方向に沿って折れ曲がるティース１２３Ａ、１２３Ｂを備えており、アウターステータコア１２１Ａとインナーステータコア１２１Ｂが軸線Ｌ方向に沿って配置された状態で、アウターステータコア１２１Ａのティース１２３Ａとインナーステータコア１２１Ｂのティース１２３Ｂが周方向において交互に配置されている。また、本実施形態では、ケース本体３１０は、反出力側のステータ組のアウターステータコア１２１Ａを構成する（図３を参照）。つまり、ケース本体３１０は、ケース本体３１０の底部３１１に、上側へ立ち上がるように複数のティース１２３を形成することにより、反出力側のステータ組のアウターステータコア１２１Ａとして機能する。   As shown in FIGS. 2 and 3, the stator 120 includes two stator sets arranged so as to overlap each other in the direction of the axis of the output shaft S (see symbol L in FIG. 5), and each stator set includes a stator core 121 ( The outer stator core 121A and the inner stator core 121B) are disposed so as to face each other in the direction of the axis L. Each of the outer stator core 121A and the inner stator core 121B includes annular flange portions 1211A and 1211B, and teeth 123A and 123B that are bent along the axis L direction from the inner peripheral edge of the flange portions 1211A and 1211B. The teeth 123A of the outer stator core 121A and the teeth 123B of the inner stator core 121B are alternately arranged in the circumferential direction in a state where 121A and the inner stator core 121B are arranged along the axis L direction. In the present embodiment, the case main body 310 constitutes the outer stator core 121A of the stator assembly on the non-output side (see FIG. 3). That is, the case body 310 functions as the outer stator core 121A of the stator assembly on the counter-output side by forming a plurality of teeth 123 so as to rise upward at the bottom 311 of the case body 310.

（出力軸の構造）
図４は、本発明の実施形態にかかるモータ１の出力軸Ｓの構造を示す斜視図である。図５は、図４に示すモータ１の出力軸Ｓの構成を示す縦方向断面図である。 (Output shaft structure)
FIG. 4 is a perspective view showing the structure of the output shaft S of the motor 1 according to the embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing the configuration of the output shaft S of the motor 1 shown in FIG.

図４及び図５に示すように、出力軸Ｓは、樹脂製の筒部ＳＴと、樹脂製の歯車部ＳＣと、樹脂製の筒部ＳＴ及び樹脂製の歯車部ＳＣと一体に形成された金属製の軸部ＳＺとを備えている。より具体的には、出力軸Ｓの軸線Ｌ方向に延伸するとともに、端板３２０の軸
受部３２１（図２参照）と摺動する軸受面を構成する樹脂製の筒部ＳＴと、樹脂製の筒部ＳＴの軸線Ｌ方向における一方側（反出力側に対応、図５の下側）に形成され、減速歯車部２０の複数の歯車における出力側歯車２１１（図２参照）に噛み合う樹脂製の歯車部ＳＣと、樹脂製の筒部ＳＴ及び樹脂製の歯車部ＳＣと一体的に形成されており、軸線Ｌ方向に垂直する径方向において樹脂製の筒部ＳＴと重なる第１部分Ｐ１、および樹脂製の筒部ＳＴから軸線Ｌ方向における他方側（出力側に対応、図５の上側）へ突出する第２部分Ｐ２を有する金属製の軸部ＳＺと、を備えている。金属製の軸部ＳＺの第２部分Ｐ２と樹脂製の筒部ＳＴとの境界部Ｊは、樹脂製の筒部ＳＴの外周縁よりも内側にある。 As shown in FIGS. 4 and 5, the output shaft S is integrally formed with the resin cylinder portion ST, the resin gear portion SC, the resin cylinder portion ST, and the resin gear portion SC. And a metal shaft portion SZ. More specifically, a resin cylinder portion ST that extends in the direction of the axis L of the output shaft S and forms a bearing surface that slides with the bearing portion 321 (see FIG. 2) of the end plate 320, and a resin Resin-made which is formed on one side (corresponding to the counter-output side, lower side in FIG. 5) in the axis L direction of the cylindrical portion ST and meshes with the output side gear 211 (see FIG. 2) of the plurality of gears of the reduction gear portion 20. Gear portion SC, resin-made cylinder portion ST, and resin-made gear portion SC are formed integrally with first portion P1, which overlaps with resin-made cylinder portion ST in the radial direction perpendicular to the axis L direction, and And a metal shaft portion SZ having a second portion P2 protruding from the resin tube portion ST to the other side in the axis L direction (corresponding to the output side, the upper side in FIG. 5). A boundary portion J between the second portion P2 of the metal shaft portion SZ and the resin tube portion ST is located inside the outer peripheral edge of the resin tube portion ST.

ここで、樹脂製の筒部ＳＴは、金属製の軸部ＳＺの第１部分Ｐ１の外周面全体を覆い、金属製の軸部ＳＺの第２部分Ｐ２の外周縁全体は、樹脂製の筒部ＳＴの外周縁よりも径方向の内側にある。   Here, the resin tube portion ST covers the entire outer peripheral surface of the first portion P1 of the metal shaft portion SZ, and the entire outer peripheral edge of the second portion P2 of the metal shaft portion SZ is formed of a resin tube. It is on the inner side in the radial direction than the outer peripheral edge of the part ST.

また、金属製の軸部ＳＺは、段付き軸であり、大径部ＤＤと、大径部ＤＤより小径の小径部ＤＸ１とを備え、大径部ＤＤと小径部ＤＸ１とは、金属製の軸部ＳＺの軸線Ｌ方向において繋がっている。大径部ＤＤは、円柱状であり、金属製の軸部ＳＺの軸線Ｌ方向における中央部にある。小径部ＤＸ１は、円柱の周方向の一部が切り取られて平坦面ＰＴが形成された形状となっており、大径部ＤＤに対して、金属製の軸部ＳＺの軸線Ｌ方向における他方側にある。   The metal shaft portion SZ is a stepped shaft and includes a large diameter portion DD and a small diameter portion DX1 having a smaller diameter than the large diameter portion DD. The large diameter portion DD and the small diameter portion DX1 are made of metal. It is connected in the axis L direction of the shaft portion SZ. The large-diameter portion DD has a columnar shape and is in the center portion in the axis L direction of the metal shaft portion SZ. The small-diameter portion DX1 has a shape in which a part of the cylinder in the circumferential direction is cut off to form a flat surface PT, and the other side in the axis L direction of the metal shaft portion SZ with respect to the large-diameter portion DD. It is in.

ここで、金属製の軸部ＳＺにおいて、大径部ＤＤの一部は、樹脂製の筒部ＳＴに対して軸線Ｌ方向における他方側に突出し、大径部ＤＤと小径部ＤＸ１との間に形成された段差面ＴＪの全体は樹脂製の筒部ＳＴから露出している。換言すると、金属製の軸部ＳＺの第２部分Ｐ２は、大径部ＤＤの一部を含んでいる。そのため、境界部Ｊは、大径部ＤＤと樹脂製の筒部ＳＴとの境界部でもあり、円形となっている。   Here, in the metal shaft portion SZ, a part of the large diameter portion DD projects to the other side in the axis L direction with respect to the resin tube portion ST, and between the large diameter portion DD and the small diameter portion DX1. The entire formed step surface TJ is exposed from the resin tube portion ST. In other words, the second portion P2 of the metal shaft portion SZ includes a part of the large diameter portion DD. Therefore, the boundary portion J is also a boundary portion between the large diameter portion DD and the resin tubular portion ST, and has a circular shape.

本実施形態において、金属製の軸部ＳＺは、大径部ＤＤに対して軸線Ｌ方向における一方側に位置し且つ大径部ＤＤよりも小径の延伸部ＤＸ２を備えている。この延伸部ＤＸ２の軸線Ｌ方向における中間部には、フランジＴが形成されており、樹脂製の歯車部ＳＣは、フランジＴの全体を覆う。   In the present embodiment, the metal shaft portion SZ includes an extending portion DX2 that is located on one side in the axis L direction with respect to the large diameter portion DD and has a smaller diameter than the large diameter portion DD. A flange T is formed in an intermediate portion of the extending portion DX2 in the axis L direction, and the resin gear portion SC covers the entire flange T.

（本実施形態の効果）
本発明の実施形態にかかるモータ１によれば、出力軸Ｓは、樹脂製の筒部ＳＴと、樹脂製の歯車部ＳＣと、該樹脂製の筒部ＳＴ及び樹脂製の歯車部ＳＣと一体に形成された金属製の軸部ＳＺとを備え、金属製の軸部ＳＺは、軸線Ｌ方向に垂直する径方向において樹脂製の筒部ＳＴと重なる第１部分Ｐ１と、樹脂製の筒部ＳＴから軸線Ｌ方向における他方側へ突出する第２部分Ｐ２とを有するので、全体が樹脂からなる従来の出力軸に比べて、出力軸Ｓの全体の強度を効果的に向上させることが可能となる。 (Effect of this embodiment)
According to the motor 1 according to the embodiment of the present invention, the output shaft S is integrated with the resin cylinder portion ST, the resin gear portion SC, and the resin cylinder portion ST and the resin gear portion SC. The metal shaft portion SZ includes a first portion P1 that overlaps the resin tube portion ST in the radial direction perpendicular to the axis L direction, and a resin tube portion. Since the second portion P2 projecting from the ST to the other side in the axis L direction is provided, it is possible to effectively improve the overall strength of the output shaft S compared to a conventional output shaft made entirely of resin. Become.

また、金属製の軸部ＳＺの第２部分Ｐ２と樹脂製の筒部ＳＴとの境界部Ｊは、樹脂製の筒部ＳＴの外周縁よりも内側にあるので、たとえ出力軸Ｓがその軸線Ｌ方向に移動したり、製造・組付け誤差が発生したりして、金属製の軸部ＳＺが軸線Ｌ方向に垂直する径方向から見て端板３２０の軸受部３２１と重なる位置まで移動しても、金属製の軸部ＳＺは、端板３２０の軸受部３２１と接触することがない。そのため、金属製の軸部ＳＺの第２部分Ｐ２と端板３２０に形成された軸受部３２１との接触により振動ノイズが発生することを回避できる。また、たとえ樹脂製の筒部ＳＴの成形時に樹脂製の筒部ＳＴと金属製の軸部ＳＺの第２部分Ｐ２との境界でバリが発生しても、出力軸Ｓの摺動ロスを招くことが無い。   Further, since the boundary portion J between the second portion P2 of the metal shaft portion SZ and the resin tube portion ST is inside the outer peripheral edge of the resin tube portion ST, the output shaft S has its axis line. The metal shaft portion SZ moves to a position where it overlaps with the bearing portion 321 of the end plate 320 when viewed from the radial direction perpendicular to the axis L direction due to movement in the L direction or production / assembly errors. However, the metal shaft portion SZ does not come into contact with the bearing portion 321 of the end plate 320. Therefore, generation of vibration noise due to contact between the second portion P2 of the metal shaft portion SZ and the bearing portion 321 formed on the end plate 320 can be avoided. Further, even if burrs occur at the boundary between the resin tube portion ST and the second portion P2 of the metal shaft portion SZ when the resin tube portion ST is molded, a sliding loss of the output shaft S is caused. There is nothing.

さらに、本発明の実施形態にかかるモータ１によれば、樹脂製の筒部ＳＴが金属製の軸
部ＳＺの第１部分Ｐ１の外周面全体を覆うので、樹脂製の筒部ＳＴを容易に形成できる。 Furthermore, according to the motor 1 according to the embodiment of the present invention, since the resin cylinder portion ST covers the entire outer peripheral surface of the first portion P1 of the metal shaft portion SZ, the resin cylinder portion ST can be easily formed. Can be formed.

また、本発明の実施形態にかかるモータ１によれば、樹脂製の筒部ＳＴと出力軸Ｓの径方向において重なる金属製の軸部ＳＺの第１部分Ｐ１が、同じ直径の大径部ＤＤの一部からなるので、たとえ樹脂製の筒部ＳＴが成形の冷却時に出力軸Ｓの径方向において収縮したとしても、軸線Ｌ方向の全体において収縮後の樹脂製の筒部ＳＴの外径の均一性を確保するのに有利である。したがって、樹脂製の筒部ＳＴと端板３２０の軸受部３２１とが軸線Ｌ方向において不均一に接触することにより振動ノイズや出力軸の摺動ロスが発生するのを回避するのに有利である。   Further, according to the motor 1 according to the embodiment of the present invention, the first portion P1 of the metal shaft portion SZ that overlaps the resin tube portion ST and the output shaft S in the radial direction is the large diameter portion DD having the same diameter. Therefore, even if the resin cylindrical portion ST contracts in the radial direction of the output shaft S during the cooling of molding, the outer diameter of the resin cylindrical portion ST after contraction in the entire axis L direction is reduced. It is advantageous to ensure uniformity. Therefore, it is advantageous to avoid the occurrence of vibration noise and sliding loss of the output shaft due to the non-uniform contact between the resin tubular portion ST and the bearing portion 321 of the end plate 320 in the direction of the axis L. .

（変形例１）
上記の実施形態では、大径部ＤＤの一部が樹脂製の筒部ＳＴに対して軸線Ｌ方向の他方側へ突出しているが、これに限らず、例えば、図６及び図７に示すように、大径部ＤＤの全体が樹脂製の筒部ＳＴによって覆われている構造を採用してもよい。つまり、大径部ＤＤと小径部ＤＸ１の間に形成された段差面ＴＪの全体が樹脂製の筒部ＳＴによって覆われている構造を採用してもよい。この時、金属製の軸部ＳＺの第１部分Ｐ１と樹脂製の筒部ＳＴの境界部Ｊ’は、小径部ＤＸ１と樹脂製の筒部ＳＴとからなり、Ｄ字形状を呈する。ここで、樹脂製の筒部ＳＴによって覆われる小径部ＤＸ１の一部は、本発明における接続部ＬＪに相当する。 (Modification 1)
In the above embodiment, a part of the large-diameter portion DD protrudes toward the other side in the axis L direction with respect to the resin-made cylindrical portion ST. However, the present invention is not limited to this, for example, as shown in FIGS. Alternatively, a structure in which the entire large-diameter portion DD is covered with the resin-made cylinder portion ST may be employed. That is, a structure in which the entire step surface TJ formed between the large diameter portion DD and the small diameter portion DX1 is covered with the resin cylindrical portion ST may be employed. At this time, the boundary portion J ′ between the first portion P1 of the metal shaft portion SZ and the resin tube portion ST is composed of the small diameter portion DX1 and the resin tube portion ST, and has a D-shape. Here, a part of the small diameter portion DX1 covered with the resin tube portion ST corresponds to the connection portion LJ in the present invention.

この構造を採用した場合、樹脂製の筒部の成形時に該樹脂製の筒部と金属製の軸部の第２部分との境界で発生するバリによる出力軸の摺動ロスを回避するのに、一層有利である。   When this structure is adopted, the sliding loss of the output shaft due to the burr generated at the boundary between the resin tube portion and the second portion of the metal shaft portion when molding the resin tube portion is avoided. More advantageous.

（変形例２）
上記の実施形態では、大径部ＤＤの一部が樹脂製の筒部ＳＴに対して軸線Ｌ方向の他方側へ突出しているが、これに限らず、例えば、図８に示すように、軸線Ｌ方向における大径部の端面（図８における上側端面）と軸線Ｌ方向における樹脂製の筒部ＳＴの端面（図８における上側端面）とが面一（同一面）になる構造を採用してもよい。 (Modification 2)
In the above embodiment, a part of the large-diameter portion DD protrudes toward the other side in the axis L direction with respect to the resin-made cylinder portion ST. However, the present invention is not limited to this, for example, as shown in FIG. Adopting a structure in which the end surface of the large-diameter portion in the L direction (upper end surface in FIG. 8) and the end surface (upper end surface in FIG. 8) of the resin tube portion ST in the axis L direction are flush with each other (same surface). Also good.

（他の実施の形態）
以上、本発明の具体的な実施形態を説明したが、前記の具体的な実施形態が本発明への限定をなしておらず、当業者は、本発明の範囲を超えることなく、前記の開示内容を基に様々な変更を行うことができる。 (Other embodiments)
Although specific embodiments of the present invention have been described above, the specific embodiments are not intended to limit the present invention, and those skilled in the art will be able to make the above disclosure without exceeding the scope of the present invention. Various changes can be made based on the content.

例えば、上記の実施形態では、減速歯車部は複数の歯車を備えているが、これに限らず、減速歯車部が少なくとも出力側の歯車を備えればよい。   For example, in the above-described embodiment, the reduction gear unit includes a plurality of gears. However, the present invention is not limited thereto, and the reduction gear unit may include at least an output-side gear.

また、上記の実施形態では、樹脂製の筒部は金属製の軸部の第１部分の外周面全体を覆うが、これに限らず、樹脂製の筒部が金属製の軸部の第１部分の外周面全体を覆わなくてもよい。然しながら、樹脂製の筒部が、少なくとも軸受部の内周面と径方向において重なる第１部分の外周面を覆うことは、好ましくて、このようにすれば、金属製の軸部と端板に形成された軸受部との接触により振動ノイズが発生することをより効果的に回避できる。   Moreover, in said embodiment, although the resin-made cylinder part covers the whole outer peripheral surface of the 1st part of metal shaft parts, it is not restricted to this but a resin-made cylinder part is the 1st of metal shaft parts. It is not necessary to cover the entire outer peripheral surface of the part. However, it is preferable that the resin cylindrical portion covers at least the outer peripheral surface of the first portion that overlaps with the inner peripheral surface of the bearing portion in the radial direction. In this way, the metal shaft portion and the end plate are covered. Generation of vibration noise due to contact with the formed bearing portion can be more effectively avoided.

また、上記の実施形態では、金属製の軸部ＳＺの第２部分Ｐ２の外周縁全体が樹脂製の筒部ＳＴの外周縁よりも径方向の内側にあるが、これに限らず、実際の要求に応じて、軸線Ｌ方向において第１部分Ｐ１の端部から離れる金属製の軸部ＳＺの第２部分Ｐ２の径方向寸法を調整してもよい。   Further, in the above embodiment, the entire outer peripheral edge of the second portion P2 of the metal shaft portion SZ is located on the inner side in the radial direction with respect to the outer peripheral edge of the resin cylindrical portion ST. As required, the radial dimension of the second portion P2 of the metallic shaft portion SZ that is separated from the end portion of the first portion P1 in the axis L direction may be adjusted.

また、上記の実施形態では、金属製の軸部は、大径部に対して軸線方向における一方側に位置し且つ大径部よりも小径の延伸部を備え、この延伸部の中間部にフランジが形成されているが、該延伸部の構造、形状及び寸法がこれに限らず、該延伸部が省略されてもよい。   Further, in the above-described embodiment, the metal shaft portion includes an extending portion that is located on one side in the axial direction with respect to the large diameter portion and has a smaller diameter than the large diameter portion, and a flange is provided at an intermediate portion of the extending portion. However, the structure, shape, and dimensions of the extending portion are not limited thereto, and the extending portion may be omitted.

また、フランジＴは全周に形成されていても良いし、周方向の一部、あるいは複数のフランジが間欠的に形成されていてもよい。また、軸方向に複数のフランジを設けてもよい。   Further, the flange T may be formed on the entire circumference, or a part of the circumferential direction or a plurality of flanges may be formed intermittently. A plurality of flanges may be provided in the axial direction.

１…モータ、１０…モータ本体部、２０…減速歯車部、２１１…出力側歯車、３１０…ケース本体、３２１…軸受部、３２０…端板、ＤＤ…大径部、Ｊ、Ｊ’…境界部、ＬＪ…接続部、Ｐ１…第１部分、Ｐ２…第２部分、Ｓ…出力軸、ＳＣ…歯車部、ＳＴ…筒部、ＳＺ…軸部、ＴＪ…段差面 DESCRIPTION OF SYMBOLS 1 ... Motor, 10 ... Motor main-body part, 20 ... Reduction gear part, 211 ... Output side gear, 310 ... Case main body, 321 ... Bearing part, 320 ... End plate, DD ... Large diameter part, J, J '... Boundary part , LJ: connection part, P1 ... first part, P2 ... second part, S ... output shaft, SC ... gear part, ST ... cylinder part, SZ ... shaft part, TJ ... step surface

Claims (5)

モータ本体部と、出力軸と、前記モータ本体部の動力を減速して前記出力軸に伝達する少なくとも一つの歯車を備えた減速歯車部と、前記モータ本体部と前記減速歯車部が収容されるケース本体と、前記ケース本体の一端を塞ぐように前記ケース本体に固定され、前記出力軸を回転可能に支持する軸受部が形成されている端板と、を備えるモータにおいて、
前記出力軸は、
前記出力軸の軸線方向に延伸するとともに、前記端板の前記軸受部と摺動する軸受面を構成する樹脂製の筒部と、
前記樹脂製の筒部の前記軸線方向における一方側に形成され、前記少なくとも一つの歯車のうちの出力側歯車に噛み合う樹脂製の歯車部と、
前記樹脂製の筒部及び前記樹脂製の歯車部と一体的に形成されており、前記軸線方向に垂直する径方向において前記樹脂製の筒部に径方向の内側で重なる第１部分、および前記樹脂製の筒部から前記軸線方向における他方側へ突出する第２部分を有する金属製の軸部と、
を備え、
前記第２部分と前記樹脂製の筒部との境界部は、前記樹脂製の筒部の外周縁よりも径方向の内側にあることを特徴とするモータ。 A motor main body portion, an output shaft, a reduction gear portion including at least one gear for reducing the power of the motor main body portion and transmitting it to the output shaft, and the motor main body portion and the reduction gear portion are accommodated. In a motor comprising: a case main body; and an end plate that is fixed to the case main body so as to close one end of the case main body and that has a bearing portion that rotatably supports the output shaft.
The output shaft is
A resin-made cylindrical portion that extends in the axial direction of the output shaft and constitutes a bearing surface that slides with the bearing portion of the end plate;
A resin gear portion that is formed on one side in the axial direction of the resin cylinder portion and meshes with an output side gear of the at least one gear;
A first portion that is integrally formed with the resin cylinder portion and the resin gear portion, and overlaps the resin cylinder portion in the radial direction in a radial direction perpendicular to the axial direction; and A metal shaft portion having a second portion protruding from the resin tube portion to the other side in the axial direction;
With
The motor is characterized in that a boundary portion between the second portion and the resin-made cylinder portion is located radially inside the outer peripheral edge of the resin-made cylinder portion. 前記第１部分は、大径部と、該大径部より小径の接続部とを備え、
前記大径部と接続部とは、前記軸線方向において繋がっており、
前記接続部は、前記第２部分に繋がっており、
前記大径部と接続部との間に形成された段差面の全体は、前記樹脂製の筒部によって覆われていることを特徴とする請求項１に記載のモータ。 The first portion includes a large diameter portion and a connection portion having a smaller diameter than the large diameter portion,
The large diameter portion and the connection portion are connected in the axial direction,
The connecting portion is connected to the second portion;
2. The motor according to claim 1, wherein an entire step surface formed between the large diameter portion and the connection portion is covered with the resin cylinder portion. 前記樹脂製の筒部は、少なくとも前記軸受部の内周面に径方向の内側で重なる前記第１部分の外周面を覆っていることを特徴とする請求項１または２に記載のモータ。   3. The motor according to claim 1, wherein the resin-made cylindrical portion covers at least an outer peripheral surface of the first portion that overlaps at least an inner peripheral surface of the bearing portion in a radial direction. 4. 前記樹脂製の筒部は、前記第１部分の外周面の全体を覆っていることを特徴とする請求項３に記載のモータ。   The motor according to claim 3, wherein the cylindrical portion made of resin covers the entire outer peripheral surface of the first portion. 前記第１部分の外径は、前記軸線方向において同じであることを特徴とする請求項１に記載のモータ。   The motor according to claim 1, wherein an outer diameter of the first portion is the same in the axial direction.
JP2015224972A 2014-11-25 2015-11-17 motor Pending JP2016101088A (en)

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JP2020022277A (en) * 2018-08-01 2020-02-06 日本電産テクノモータ株式会社 motor
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CN110030364A (en) * 2019-04-19 2019-07-19 浙江美亚特精密机械有限公司 A kind of multiple field metal/resin gear and its manufacturing process and purposes

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JPS6341790U (en) * 1986-09-03 1988-03-18
JPH07290588A (en) * 1994-04-26 1995-11-07 Rhythm Watch Co Ltd Resin gear equipped with metal shaft and manufacture thereof
JPH1014170A (en) * 1996-06-19 1998-01-16 Sankyo Seiki Mfg Co Ltd Friction mechanism and compact motor with friction mechanism
JP2001012561A (en) * 1999-06-28 2001-01-16 Mitsubishi Material Cmi Kk Motor with clutch
JP2014035004A (en) * 2012-08-08 2014-02-24 Nidec Sankyo Corp Geared motor

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Publication number Priority date Publication date Assignee Title
JPS6341790U (en) * 1986-09-03 1988-03-18
JPH07290588A (en) * 1994-04-26 1995-11-07 Rhythm Watch Co Ltd Resin gear equipped with metal shaft and manufacture thereof
JPH1014170A (en) * 1996-06-19 1998-01-16 Sankyo Seiki Mfg Co Ltd Friction mechanism and compact motor with friction mechanism
JP2001012561A (en) * 1999-06-28 2001-01-16 Mitsubishi Material Cmi Kk Motor with clutch
JP2014035004A (en) * 2012-08-08 2014-02-24 Nidec Sankyo Corp Geared motor

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