JP2010074880A - Stepping motor - Google Patents

Stepping motor Download PDF

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Publication number
JP2010074880A
JP2010074880A JP2008236346A JP2008236346A JP2010074880A JP 2010074880 A JP2010074880 A JP 2010074880A JP 2008236346 A JP2008236346 A JP 2008236346A JP 2008236346 A JP2008236346 A JP 2008236346A JP 2010074880 A JP2010074880 A JP 2010074880A
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Japan
Prior art keywords
stepping motor
bearing
groove
flange portion
bottomed cylindrical
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Pending
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JP2008236346A
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Japanese (ja)
Inventor
Takatoshi Horiuchi
崇利 堀内
Yasushi Suzuki
靖 鈴木
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Sanyo Electric Co Ltd
Nidec Seimitsu Corp
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Sanyo Electric Co Ltd
Sanyo Seimitsu Co Ltd
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Application filed by Sanyo Electric Co Ltd, Sanyo Seimitsu Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP2008236346A priority Critical patent/JP2010074880A/en
Priority to KR1020090058087A priority patent/KR20100032293A/en
Priority to CN200910159882A priority patent/CN101677205A/en
Publication of JP2010074880A publication Critical patent/JP2010074880A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/10—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type
    • H02K37/12—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets
    • H02K37/14—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of permanent magnet type with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
    • H02K37/24—Structural association with auxiliary mechanical devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/163—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at only one end of the rotor

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stepping motor high in strength against bearing retainer coming-off and having a bearing retainer structure that enables cost reduction. <P>SOLUTION: The motor body 1 of the stepping motor integrally has a hat-shaped bearing retainer 20 of a sheet metal press molding, integrally including: a bottomed cylindrical portion 21; and a flange portion 22. The bottomed cylindrical portion 21 houses a pivot bearing 12 for rotatably supporting the axial end of a sleeve S with a motor shaft 2 press-fit therein so as to be slid in a thrust direction. It thereby retains a coil spring 13 placed in an annular groove T on the opposite side to a ball holding hole 12a in the pivot bearing 12. The flange portion 22 is lapped on the end face portion 11a of a B-phase outer yoke 11 that is protruded outward in the radial direction on the opening side of the bottomed cylindrical portion 21 and includes an outer stator and is welded and fixed there. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ステッピングモータ等に関し、特に、軸受ハウジング及び軸受押えの構造に関する。   The present invention relates to a stepping motor and the like, and more particularly, to a structure of a bearing housing and a bearing retainer.

特開２００６−１７４５９５に示すＰＭ型ステッピングモータのアウターステータを構成するヨークの後端面部には真鍮製の軸受ハウジングが設けられており、軸受ハウジングの中央貫通孔にはインナーロータの軸端を鋼球を介して回転可能に支持するためのピボット軸受が入り込み、このピボット軸受の後端側の環状溝にコイルスプリングを収めた後、軸受ハウジングの外周溝に嵌り込む４つの爪状のバネ片を一体的に持つバネ材から成るキャップで中央貫通孔を塞いでいる。このキャップは回転軸からのスラスト力に対してピボット軸受を押える軸受押えとして機能している。
特開２００６−１７４５９５（図３） A bearing housing made of brass is provided on the rear end surface portion of the yoke constituting the outer stator of the PM type stepping motor disclosed in Japanese Patent Application Laid-Open No. 2006-174595, and the shaft end of the inner rotor is connected to the center through hole of the bearing housing. A pivot bearing for rotatably supporting through a ball enters, and after storing a coil spring in an annular groove on the rear end side of the pivot bearing, four claw-shaped spring pieces fitted into the outer peripheral groove of the bearing housing are provided. The central through hole is closed with a cap made of an integral spring material. This cap functions as a bearing retainer that retains the pivot bearing against the thrust force from the rotating shaft.
JP 2006-174595 (FIG. 3)

上記のピボット軸受の軸受け押え構造においては、次のような問題点があった。第１に、キャップ自体は複数のバネ片で軸受ハウジングの外周溝に外嵌して弾力的に固定されるため、回転軸に加わるスラスト力が高まると、バネ片が弾性変形して外周溝から外れ易く、軸受押えの外れ耐力が弱い。第２に、鋼球及びピボット軸受を収容するための切削加工品の軸受ハウジングを必要とし、低コスト化の障害となっている。   The bearing holding structure for the pivot bearing has the following problems. First, since the cap itself is elastically fixed by being externally fitted to the outer peripheral groove of the bearing housing with a plurality of spring pieces, when the thrust force applied to the rotating shaft is increased, the spring piece is elastically deformed and is removed from the outer peripheral groove. It is easy to come off, and the bearing holder's come-off resistance is weak. Secondly, a machined housing for housing steel balls and a pivot bearing is required, which is an obstacle to cost reduction.

そこで、上記問題点に鑑み、本発明の課題は、軸受押えの外れ耐力が頗る高く、しかも低コスト化を図れる軸受け押え構造を備えたステッピングモータを提供することにある。   Therefore, in view of the above problems, an object of the present invention is to provide a stepping motor having a bearing retainer structure that has a high bearing detachment proof strength and can reduce costs.

上記課題を解決するため、本発明に係るステッピングモータは、インナーロータの軸端を回転自在に支持するための軸受をスラスト方向にスライド可能に収容して軸受の軸端側とは反対側の環状溝に入れたコイルスプリングを押える有底筒部と、この有底筒部の筒口側で径方向外方に張り出てアウターステータの端面部に重ねて溶接固定した鍔部とを一体的に有する板金プレス成形品の軸受押えを備えて成ることを特徴とする。なお、この軸受はスラスト軸受でもピボット軸受でも良い。   In order to solve the above-mentioned problems, a stepping motor according to the present invention accommodates a bearing for rotatably supporting the shaft end of an inner rotor so as to be slidable in the thrust direction, and has an annular shape opposite to the shaft end side of the bearing. A bottomed tube portion that holds the coil spring in the groove and a flange portion that protrudes radially outward on the tube opening side of the bottomed tube portion and is welded and overlapped on the end surface portion of the outer stator are integrally provided. A bearing press for a sheet metal press-formed product is provided. This bearing may be a thrust bearing or a pivot bearing.

この板金プレス成形品の軸受押えは、軸受ハウジングとしての有底筒部内に軸受及びコイルスプリングを収容し、鍔部でヨークの端面部に溶接固定してあるため、インナーロータに加わるスラスト力が非常に強くても外れ難い。また切削加工品の軸受ハウジングを削減できるため、低コスト化を図ることができる。   This sheet metal press-molded bearing retainer contains a bearing and a coil spring in a bottomed cylindrical part as a bearing housing, and is welded and fixed to the end face of the yoke at the flange, so the thrust force applied to the inner rotor is extremely high It is hard to come off even if it is strong. In addition, since the bearing housing of the machined product can be reduced, the cost can be reduced.

ここで、有底筒部の筒口の縁は鍔部から突出してアウターステータの内周面側にまで進入して成る環状突起である場合、環状突起の部分だけ有底筒部が余分に深くなり、有底筒部内で嵌め合い長さを長くしたスラスト軸受を使用でき、スラスト軸受の軸方向に対する傾きを抑えることができるので、回転軸のすりこぎ運動を抑制できる。   Here, when the edge of the tube opening of the bottomed tube portion is an annular protrusion that protrudes from the flange and enters the inner peripheral surface side of the outer stator, the bottomed tube portion becomes excessively deep only by the portion of the annular protrusion. Since the thrust bearing having a long fitting length in the bottomed cylinder portion can be used and the inclination of the thrust bearing with respect to the axial direction can be suppressed, the revolving motion of the rotating shaft can be suppressed.

この環状突起の部分を持つ軸受ハウジングとしては、筒口の縁に突き曲げ加工を施すことにより、環状突起から鍔部の内周側にかけて端面部のうちアウターステータの内周面側隅部に重なるテーパー部を有する構成とすることができる。また、鍔部のうち端面部と重なる面側を押し潰すことにより、鍔部の板厚は環状突起を除いた部分で有底筒部の板厚よりも薄くしても良い。   The bearing housing having the annular protrusion has a taper that overlaps the inner peripheral surface side corner of the outer stator of the end surface from the annular protrusion to the inner peripheral side of the flange portion by bending the edge of the tube opening. It can be set as the structure which has a part. Further, by crushing the side of the flange that overlaps the end surface portion, the thickness of the flange may be made thinner than the thickness of the bottomed cylindrical portion at the portion excluding the annular protrusion.

そして、環状溝が溝口から溝底にかけて溝幅が次第に減少する勾配溝である場合、コイルスプリングが強く圧縮されても、コイルスプリングの一端側が溝底に当接すると共にその他端側が有底筒部の底面に当接し、コイルスプリングは両端途中が勾配溝の溝内面に接触して偏って変形するのを防げるため、回転軸のすりこぎ運動を抑制できる。   When the annular groove is a gradient groove whose groove width gradually decreases from the groove opening to the groove bottom, even if the coil spring is strongly compressed, one end side of the coil spring contacts the groove bottom and the other end side is the bottomed cylindrical portion. Since the coil spring abuts against the bottom surface and the middle of both ends is in contact with the groove inner surface of the gradient groove and is prevented from being deflected and deformed, the revolving motion of the rotating shaft can be suppressed.

本発明では、板金プレス成形品の軸受押えは、軸受ハウジングとしての有底筒部内にピボット軸受及びコイルスプリングを収容し、鍔部でアウターステータの端面部に溶接固定してあるため、インナーロータに加わるスラスト力が非常に強くても外れ難い。また切削加工品の軸受ハウジングを削減できるため、低コスト化を図ることができる。   In the present invention, the bearing retainer of the sheet metal press-molded product accommodates the pivot bearing and the coil spring in the bottomed cylindrical portion as the bearing housing, and is welded and fixed to the end surface portion of the outer stator at the flange portion. Even if the thrust force applied is very strong, it is difficult to come off. In addition, since the bearing housing of the machined product can be reduced, the cost can be reduced.

次に、本発明の実施形態を添付図面に基づいて説明する。   Next, embodiments of the present invention will be described with reference to the accompanying drawings.

図１は本発明の実施例１に係るリードスクリュー・モータを示す断面図、図２は同リードスクリュー・モータの組立斜視図、図３は同リードスクリュー・モータの要部を示す組立斜視図である。   1 is a cross-sectional view showing a lead screw motor according to a first embodiment of the present invention, FIG. 2 is an assembly perspective view of the lead screw motor, and FIG. 3 is an assembly perspective view showing an essential part of the lead screw motor. is there.

本例のリードスクリュー・モータは、ステッピングモータ本体１と、これから突出して周面にリードスクリュウ溝（図示せず）が形成されたモータシャフト２と、ステッピングモータ本体１のＡ相アウターヨーク６の端面部６ａに溶接固定されたフレーム３と、このフレーム３に取着し、シャフト２の先端縮径部２ａを鋼球Ｂ１を介して回転自在に支承するピボット軸受４とを有する。 The lead screw motor of this example includes a stepping motor main body 1, a motor shaft 2 projecting therefrom and having a lead screw groove (not shown) formed on the peripheral surface, and an end surface of an A-phase outer yoke 6 of the stepping motor main body 1. a frame 3 which is welded to the section 6a, and attached to the frame 3, and a pivot bearing 4 a tip reduced portion 2a of the shaft 2 is rotatably supported through a steel ball B 1.

ステッピングモータ本体１はＰＭ型ステッピングモータで、そのインナーロータとしては、円環状ロータ磁石Ｍ１，Ｍ２と、モータシャフト２を一方端から圧入した軸孔Ｈを持ち円環状ロータ磁石Ｍ１，Ｍ２が外嵌した樹脂製のスリーブＳとを有する。 The stepping motor main body 1 is a PM type stepping motor, and as its inner rotor, there are annular rotor magnets M 1 and M 2 and a shaft hole H into which the motor shaft 2 is press-fitted from one end, and the annular rotor magnets M 1 and M 2 has a resin sleeve S fitted on the outside.

ステッピングモータ本体１のアウターステータとしては、端面部６ａから切り起した極歯Ｋ１を持ち筒状ケース半体としても機能するＡ相アウターヨーク６と、Ａ相コイルボビン７ａにＡ相コイル巻線７ｂが巻装され、Ａ相アウターヨーク６の周壁部６ｂと極歯Ｋ１との間に収容されるＡ相コイル７と、極歯Ｋ１と交互に配列された極歯Ｋ２を切り起したＡ相インナーヨーク８と、極歯Ｋ３を持ちＡ相インナーヨーク８と背合わせ状態のＢ相インナーヨーク９と、Ｂ相コイルボビン１０ａにＢ相コイル巻線１０ｂが巻装され、Ｂ相インナーヨーク９の極歯Ｋ３が内嵌するＢ相コイル１０と、極歯Ｋ３と交互に配列された極歯Ｋ４が切り起された端面部１１ａ及び周壁部１１ｂから成り筒状ケース半体としても機能するＢ相アウターヨーク１１とを有する。 A stepping motor as the main body 1 of the outer stator, an A-phase outer yoke 6 which also functions as a has cylindrical case halves pole teeth K 1 cut and raised from the end face 6a, A to A-phase coil bobbin 7a-phase coil 7b There is wound, the a-phase coil 7 is housed between the peripheral wall portion 6b and the pole teeth K 1 of the a-phase outer yoke 6, and cutting and raising the pole teeth K 2 arranged alternately with the pole teeth K 1 A B-phase inner yoke 8, a B-phase inner yoke 9 having pole teeth K 3 and back-to-back with the A-phase inner yoke 8, and a B-phase coil bobbin 10 a are wound with a B-phase coil winding 10 b, and a B-phase inner yoke and B-phase coil 10 pole teeth K 3 are fitted into the 9, as made tubular case half body from the end face 11a and the peripheral wall portion 11b pole teeth K 4 arranged alternately with the pole teeth K 3 is cut and raised B-phase outer yaw that works And a 11.

このステッピングモータ本体１においては、スリーブＳの他方端を鋼球Ｂ２を介して回転自在に支持する抱球穴１２ａを持つピボット軸受１２が設けられ、このピボット軸受１２を支持する軸受押え２０が設けられている。この軸受押え２０はハット状の板金プレス成形品で、有底筒部２１と、この有底筒部２１の筒口側で径方向外方に張り出た鍔部２２とを一体的に有する。有底筒部２１は、ピボット軸受１２をスラスト方向にスライド可能に収容する周壁部２１ａとピボット軸受１２の回転軸側とは反対側の円環状溝Ｔに入れたコイルスプリング１３を押える底板部２１ｂとから成り、鍔部２２はＢ相アウターヨーク１１の端面部１１ａに重ねて溶接固定されている。鍔部２２の位置決め凹部Ｙと端面部１１ａの位置決め突部Ｘとの嵌め合い部分でスポット溶接されている。そして、ピボット軸受１２の円環状溝Ｔは溝口から溝底にかけて溝幅が次第に減少する勾配溝となっている。 In the stepping motor main body 1, the other end of the sleeve S pivot bearing 12 is provided with a抱球holes 12a for rotatably supported via the steel balls B 2, bearing retainer 20 supporting the pivot bearing 12 is Is provided. The bearing retainer 20 is a hat-shaped sheet metal press-molded product, and integrally includes a bottomed cylindrical portion 21 and a flange portion 22 that protrudes radially outward on the tube opening side of the bottomed cylindrical portion 21. The bottomed tube portion 21 includes a peripheral wall portion 21a that accommodates the pivot bearing 12 so as to be slidable in the thrust direction, and a bottom plate portion 21b that presses the coil spring 13 that is placed in the annular groove T on the opposite side of the rotation axis side of the pivot bearing 12. The flange portion 22 is overlapped on the end surface portion 11a of the B-phase outer yoke 11 and fixed by welding. Spot welding is performed at a fitting portion between the positioning recess Y of the flange portion 22 and the positioning protrusion X of the end surface portion 11a. The annular groove T of the pivot bearing 12 is a gradient groove whose groove width gradually decreases from the groove opening to the groove bottom.

なお、ｈ１は底板２１ｂの中心に形成された空気抜き孔、ｈ２はＢ相アウターヨーク１１の端面部１１ａの小孔ｈ３と合致させる位置決め孔である。 Incidentally, h 1 is an air vent hole formed in the center of the bottom plate 21b, h 2 is a positioning hole to match the small hole h 3 of the end surface portion 11a of the B-phase outer yoke 11.

このように本例において、板金プレス成形品の軸受押え２０は、軸受ハウジングとしての有底筒部２１内にピボット軸受１２及びコイルスプリング１３を収容し、鍔部２２でＢ相アウターヨーク１１の端面部１１ａに溶接固定してあるため、シャフト２に加わるスラスト力が非常に強くても外れ難い。また切削加工品の軸受ハウジングを削減できるため、低コスト化を図ることができる。更に、円環状溝Ｔが溝口から溝底にかけて溝幅が次第に減少する勾配溝であるため、コイルスプリング１３が強く圧縮されても、コイルスプリング１３の一端側が溝底に当接すると共にその他端側が底板２１ｂに当接し、コイルスプリング１３は両端途中が勾配溝の溝内面に接触して偏って変形するのを防げるため、モータシャフト２のすりこぎ運動を抑制できる。   Thus, in this example, the bearing retainer 20 of the sheet metal press-molded product houses the pivot bearing 12 and the coil spring 13 in the bottomed cylindrical portion 21 as the bearing housing, and the end surface of the B-phase outer yoke 11 at the flange portion 22. Since it is fixed to the portion 11a by welding, it is difficult to come off even if the thrust force applied to the shaft 2 is very strong. In addition, since the bearing housing of the machined product can be reduced, the cost can be reduced. Further, since the annular groove T is a gradient groove whose groove width gradually decreases from the groove opening to the groove bottom, even if the coil spring 13 is strongly compressed, one end side of the coil spring 13 contacts the groove bottom and the other end side is the bottom plate. Since the coil spring 13 contacts the inner surface of the gradient groove and is prevented from being biased and deformed, the coil spring 13 can be restrained from squeezing motion.

図４は本発明の実施例２に係るリードスクリュー・モータを示す部分断面図で、図４において図１に示す部分と同一部分には同一参照符合を付し、その説明は省略する。   4 is a partial sectional view showing a lead screw motor according to Embodiment 2 of the present invention. In FIG. 4, the same parts as those shown in FIG.

本例の実施例１と異なる点は、有底筒部２１の筒口縁が鍔部２２からスリーブＳの他端側へ突出してＢ相アウターヨーク１１の内周面１１ｃ側にまで進入して成る円環状突起Ｃとなっており、軸受押え２０のプレス加工時において筒口縁に突き曲げ加工を施すことにより、円環状突起Ｃから鍔部２２の内周側にかけては端面部１１ａのうちＢ相アウターヨーク１１の内周面側隅部Ｎに重なるテーパー部Ｐとなっている。円環状突起Ｃの部分だけ有底筒部２１が余分に深くなり、有底筒部２１内で嵌め合い長さを長くしたピボット軸受１２を使用でき、ピボット軸受１２の軸方向に対する傾きを抑えることができるので、モータシャフト２のすりこぎ運動を抑制できる。   The difference from Example 1 of the present example is that the bottom edge of the bottomed tube portion 21 protrudes from the flange portion 22 to the other end side of the sleeve S and enters the inner peripheral surface 11c side of the B-phase outer yoke 11. An annular projection C is formed, and the cylindrical mouth edge is subjected to a bending process when the bearing retainer 20 is pressed, so that the B-phase outer of the end surface portion 11a extends from the annular projection C to the inner peripheral side of the flange portion 22. A tapered portion P is formed to overlap the inner peripheral surface side corner N of the yoke 11. The bottomed cylindrical portion 21 is excessively deepened only by the annular projection C, and the pivot bearing 12 having a long fitting length in the bottomed cylindrical portion 21 can be used, and the tilt of the pivot bearing 12 with respect to the axial direction can be suppressed. Therefore, the plowing motion of the motor shaft 2 can be suppressed.

図５は本発明の実施例３に係るリードスクリュー・モータを示す部分断面図で、図５において図４に示す部分と同一部分には同一参照符合を付し、その説明は省略する。   FIG. 5 is a partial sectional view showing a lead screw motor according to Embodiment 3 of the present invention. In FIG. 5, the same parts as those shown in FIG.

本例では、軸受押え２０のプレス加工時において鍔部２２のうち端面部１１ａと重なる面側を押し潰すことにより、鍔部２２の板厚ｔ２は円環状突起Ｃを除いた部分で有底筒部２１の板厚ｔ１よりも薄くなっており、実施例２の如きテーパー部Ｐは形成されていない。本例においても、円環状突起Ｃの部分だけ有底筒部２１が余分に深くなり、有底筒部２１内で嵌め合い長さを長くしたピボット軸受１２を使用でき、ピボット軸受１２の軸方向に対する傾きを抑えることができるので、モータシャフト２のすりこぎ運動を抑制できる。 In this example, by crushing the side overlapping the out end face portion 11a of the flange portion 22 at the time of press working of the bearing retainer 20, partially bottomed plate thickness t 2 of the flange portion 22 excluding the annular protrusion C It is thinner than the plate thickness t 1 of the cylindrical portion 21, and the tapered portion P as in the second embodiment is not formed. Also in this example, the bottomed cylindrical portion 21 becomes excessively deep only in the portion of the annular projection C, and the pivot bearing 12 having a long fitting length in the bottomed cylindrical portion 21 can be used. Since the inclination with respect to can be suppressed, it is possible to suppress the plowing motion of the motor shaft 2.

本発明の実施例１に係るリードスクリュー・モータを示す断面図である。It is sectional drawing which shows the lead screw motor which concerns on Example 1 of this invention. 同リードスクリュー・モータの組立斜視図である。It is an assembly perspective view of the lead screw motor. 同リードスクリュー・モータの要部を示す組立斜視図である。It is an assembly perspective view which shows the principal part of the lead screw motor. 本発明の実施例２に係るリードスクリュー・モータを示す部分断面図である。It is a fragmentary sectional view which shows the lead screw motor which concerns on Example 2 of this invention. 本発明の実施例３に係るリードスクリュー・モータを示す部分断面図である。It is a fragmentary sectional view which shows the lead screw motor which concerns on Example 3 of this invention.

符号の説明Explanation of symbols

１…ステッピングモータ本体
２…モータシャフト
２ａ…先端縮径部
３…フレーム
４，１２…ピボット軸受
６…Ａ相アウターヨーク
６ａ，１１ａ…端面部
６ｂ，１１ｂ，２１ａ…周壁部
７…Ａ相コイル
７ａ…Ａ相コイルボビン
７ｂ…Ａ相コイル巻線
８…Ａ相インナーヨーク
９…Ｂ相インナーヨーク
１０…Ｂ相コイル
１０ａ…Ｂ相コイルボビン
１０ｂ…Ｂ相コイル巻線
１１…Ｂ相アウターヨーク
１１ｃ…内周面
１２ａ…抱球穴
１３…コイルスプリング
２０…軸受押え
２１…有底筒部
２１ｂ…底板部
２２…鍔部
Ｂ１，Ｂ２…鋼球
Ｃ…円環状突起
Ｈ…軸孔
ｈ１…空気抜き孔
ｈ２…位置決め孔
ｈ３…小孔
Ｋ１〜Ｋ４…極歯
Ｍ１，Ｍ２…円環状ロータ磁石
Ｎ…内周面側隅部
Ｐ…テーパー部
Ｓ…スリーブ
Ｔ…円環状溝
ｔ１…有底筒部の板厚
ｔ２…鍔部の板厚
Ｘ…位置決め突部
Ｙ…位置決め凹部 DESCRIPTION OF SYMBOLS 1 ... Stepping motor main body 2 ... Motor shaft 2a ... Tip diameter reducing part 3 ... Frame 4, 12 ... Pivot bearing 6 ... A phase outer yoke 6a, 11a ... End surface part 6b, 11b, 21a ... Peripheral wall part 7 ... A phase coil 7a A phase coil bobbin 7b A phase coil winding 8 A phase inner yoke 9 B phase inner yoke 10 B phase coil 10a B phase coil bobbin 10b B phase coil winding 11 B phase outer yoke 11c Inner circumference surface 12a ...抱球holes 13 ... coil spring 20 ... bearing retainer 21 ... bottomed cylindrical portion 21b ... bottom plate portion 22 ... flange portion B 1, B 2 ... steel balls C ... annular projection H ... axial hole h 1 ... air vent hole h 2 ... positioning hole h 3 ... small holes K 1 to K 4 ... pole teeth M 1 and M 2 ... annular rotor magnet N ... inner peripheral surface side corner P ... taper part S ... sleeve T ... annular groove t 1 ... bottomed cylindrical portion of the plate thickness t Thickness X ... positioning protrusion Y ... positioning recess ... flange portion

Claims (5)

インナーロータの軸端を回転自在に支持するための軸受をスラスト方向にスライド可能に収容して前記軸受の前記軸端側とは反対側の環状溝に入れたコイルスプリングを押える有底筒部と、この有底筒部の筒口側で径方向外方に張り出てアウターステータの端面部に重ねて溶接固定した鍔部とを一体的に有する板金プレス成形品の軸受押えを備えて成ることを特徴とするステッピングモータ。 A bottomed cylindrical portion for holding a bearing for rotatably supporting the shaft end of the inner rotor so as to be slidable in a thrust direction and holding a coil spring placed in an annular groove opposite to the shaft end side of the bearing; A sheet metal press-molded bearing retainer integrally having a flange portion projecting radially outward on the tube opening side of the bottomed tubular portion and overlapping and welded to the end surface portion of the outer stator. Feature stepping motor. 請求項１に記載のステッピングモータにおいて、前記筒口の縁は前記鍔部から突出して前記アウターステータの内周面側にまで進入して成る環状突起であることを特徴とするステッピングモータ。 2. The stepping motor according to claim 1, wherein an edge of the cylindrical opening is an annular protrusion that protrudes from the flange portion and enters the inner peripheral surface of the outer stator. 請求項２に記載のステッピングモータにおいて、前記軸受押えは、前記環状突起から前記鍔部の内周側にかけて前記端面部のうち前記アウターステータの内周面側隅部に重なるテーパー部を有して成ることを特徴とするステッピングモータ。 3. The stepping motor according to claim 2, wherein the bearing retainer has a tapered portion that overlaps an inner peripheral surface side corner of the outer stator among the end surface portions from the annular protrusion to an inner peripheral side of the flange portion. Stepping motor characterized by comprising. 請求項２に記載のステッピングモータにおいて、前記鍔部の板厚は前記環状突起を除いた部分で前記有底筒部の板厚よりも薄いことを特徴とするステッピングモータ。 3. The stepping motor according to claim 2, wherein a thickness of the flange portion is smaller than a thickness of the bottomed cylindrical portion at a portion excluding the annular protrusion. 請求項１乃至請求項４のいずれか一項に記載のステッピングモータにおいて、前記環状溝は溝口から溝底にかけて溝幅が次第に減少する勾配溝であることを特徴とするステッピングモータ。 5. The stepping motor according to claim 1, wherein the annular groove is a gradient groove in which a groove width gradually decreases from a groove opening to a groove bottom.
JP2008236346A 2008-09-16 2008-09-16 Stepping motor Pending JP2010074880A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2008236346A JP2010074880A (en) 2008-09-16 2008-09-16 Stepping motor
KR1020090058087A KR20100032293A (en) 2008-09-16 2009-06-29 Stepping motor
CN200910159882A CN101677205A (en) 2008-09-16 2009-07-16 Step motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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JP2012023897A (en) * 2010-07-15 2012-02-02 Nidec Sankyo Corp Motor

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CN105065175B (en) * 2015-09-10 2017-09-01 浙江正盛轴瓦有限责任公司 Water pilot bearing keeps off oil machine structure
CN114430223B (en) * 2022-04-02 2022-06-21 新思考电机有限公司 Stepping motor for lens drive, method, lens drive device, and image pickup apparatus
CN115224905B (en) * 2022-08-30 2024-02-06 常州市江华电机电器有限公司 Heat dissipation stepper motor

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JP2006174595A (en) * 2004-12-15 2006-06-29 Nidec Copal Corp Stepping motor

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US6317287B1 (en) * 1995-04-07 2001-11-13 Copal Company Limited Motor with output shaft having lead screw portion and pre-load generating mechanism
JP3723796B2 (en) * 2002-10-11 2005-12-07 三菱電機株式会社 Actuator for operation of shift control valve of automatic transmission
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JPH08308167A (en) * 1995-05-12 1996-11-22 Copal Co Ltd Motor with lead screw
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JP2006174595A (en) * 2004-12-15 2006-06-29 Nidec Copal Corp Stepping motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012023897A (en) * 2010-07-15 2012-02-02 Nidec Sankyo Corp Motor

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KR20100032293A (en) 2010-03-25

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