JP6006947B2 - Magnet fixed spring - Google Patents
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Description
本発明は、円筒状のモータハウジングの内周面に沿って配置された複数の円弧状の永久磁石に対し、隣接する該永久磁石の相対向する端面の少なくとも一方の端面間において該端面を離反させる方向に付勢する磁石固定ばねに関する。 According to the present invention, with respect to a plurality of arc-shaped permanent magnets arranged along the inner peripheral surface of a cylindrical motor housing, the end surfaces are separated from each other between at least one of the opposing end surfaces of the adjacent permanent magnets. The present invention relates to a magnet fixing spring that is biased in a direction to be moved.
従来、この種の磁石固定ばねとしては、下記特許文献１に示すように、Ｕ字形の弾性線状部材の一方の脚部を直線上とすると共に、他方の脚部をくの字状に折り曲げたばねが知られている。（下記特許文献１ 段落００１２〜００１５、［図２］参照）。 Conventionally, as this type of magnet fixing spring, as shown in Patent Document 1 below, one leg portion of a U-shaped elastic linear member is linear, and the other leg portion is bent into a dogleg shape. Taspring is known. (See Patent Document 1, paragraphs 0012 to 0015, [FIG. 2] below).
かかる従来の磁石固定ばねでは、Ｕ字形状の加工精度を高めることなく、一方の脚部を全面で永久磁石と当接させることができ、軸方向に対して傾斜して固定され、両方の脚部が永久磁石と点接触状態となることを回避することができる。 In such a conventional magnet fixing spring, one leg portion can be brought into contact with the permanent magnet over the entire surface without increasing the U-shaped machining accuracy, and is fixed while being inclined with respect to the axial direction. It can be avoided that the portion is in a point contact state with the permanent magnet.
ここで、この種の磁石固定ばねは、治具を用いて隣接する永久磁石に挿入して固定するところ、かかる従来の磁石固定ばねでは、Ｕ字形状を無理に非対称としたために、治具にばねを一時的に保持しようとしても、バランスを崩して落下してしまうという問題があった。 Here, this kind of magnet fixing spring is inserted into an adjacent permanent magnet and fixed by using a jig. In such a conventional magnet fixing spring, the U-shape is forcibly asymmetrical. Even if the spring is temporarily held, there is a problem that the balance is lost and the spring is dropped.
特に、磁石固定ばねによる永久磁石の固定は、通常、組立て機械が用いられる。そのため、かかる機械による組立工程では、まず、第１には、ばねを治具まで送るパーツフィーダーで正しくばねを治具に送れないという問題が生じていた。さらに、治具にばねが送られても、ばねを一時的に固定してモータハウジング内の所定位置に挿入する際に、ばねが落下したり、一方の脚部が全面で永久磁石と当接する正しい挿入位置とならないという問題が生じていた。 In particular, an assembly machine is usually used for fixing a permanent magnet by a magnet fixing spring. Therefore, in the assembly process by such a machine, firstly, there has been a problem that the spring cannot be correctly fed to the jig by the parts feeder that sends the spring to the jig. Furthermore, even if the spring is sent to the jig, when the spring is temporarily fixed and inserted into a predetermined position in the motor housing, the spring falls or one leg part comes into contact with the permanent magnet over the entire surface. There was a problem that the insertion position was not correct.
以上の事情に鑑みて、本発明は、機械によるモータの組立工程に組み込むことが可能な磁石固定ばねを提供することを目的とする。 In view of the above circumstances, an object of the present invention is to provide a magnet fixing spring that can be incorporated into a motor assembly process using a machine.
第１発明の磁石固定ばねは、
１本の弾性線状のばね材を加工してなるばねであって、円筒状のモータハウジングの内周面に沿って配置された複数の円弧状の永久磁石に対し、隣接する該永久磁石の相対向する端面の少なくとも一方の端面間において該端面を離反させる方向に付勢する磁石固定ばねにおいて、
前記１本のばね材の中間位置に設けられ、その左右が第１脚部および第２脚部である第１屈曲部と、
前記第１脚部の前記第１屈曲部側の位置に設けられ、該第１屈曲部の屈曲方向と同じ方向に該第１脚部を屈曲させた第１脚部側第２屈曲部と、
前記第２脚部の前記第１屈曲部側の位置に設けられ、該第１屈曲部の屈曲方向と同じ方向に該第２脚部を屈曲させた第２脚部側第２屈曲部と、
前記第１脚部の前記第１脚部側第２屈曲部とその端部との間に設けられ、前記第１屈曲部の屈曲方向と同じ方向に該第１脚部を屈曲させた第３屈曲部と
を備え、
前記第１脚部側第２屈曲部における屈曲角に対して前記第２脚部側第２屈曲部における屈曲角がより屈曲すると共に、当該ばねの重心位置が前記第１屈曲部を通り該第１脚部側第２屈曲部および該第２脚部側第２屈曲部が線対称となる対称軸上に配置されるように前記第３屈曲部が屈曲していることを特徴とする。
The magnet fixing spring of the first invention is
A spring formed by processing a single elastic linear spring material, and a plurality of arc-shaped permanent magnets arranged along the inner peripheral surface of a cylindrical motor housing. In a magnet fixing spring that biases in a direction to separate the end faces between at least one of the opposing end faces,
Provided at an intermediate position of said one spring member, and the left and right first bent portion is a first leg and a second leg,
A first leg-side second bent portion that is provided at a position on the first bent portion side of the first leg portion and bent the first leg portion in the same direction as the bent direction of the first bent portion;
A second leg-side second bent portion that is provided at a position on the first bent portion side of the second leg portion and bent the second leg portion in the same direction as the bent direction of the first bent portion;
A third leg provided between the first leg side second bent part of the first leg part and the end part thereof, wherein the first leg part is bent in the same direction as the bending direction of the first bent part. With a bent portion,
With bending angle of the second leg-side second bend relative to the bending angle in the first leg side second bent portion is further bent, through the center of gravity position of the spring the first bent portion the first The third bent portion is bent so that the one leg-side second bent portion and the second leg-side second bent portion are arranged on a symmetrical axis that is line-symmetric.
かかる第１発明の磁石固定ばねによれば、第１脚部には、第１脚部側第２屈曲部とその端部との間には第３屈曲部が形成されているため、第１脚部と第２脚部との対称性を崩して、一方の脚部を全面で永久磁石と当接させることができ、両方の脚部が永久磁石と点接触状態となることを回避することができる。 According to the magnet fixing spring of the first aspect of the present invention, the first leg portion is formed with the third bent portion between the first leg-side second bent portion and the end portion thereof. The symmetry between the leg and the second leg can be broken, and one leg can be brought into contact with the permanent magnet over the entire surface, so that both legs can be prevented from being in point contact with the permanent magnet. Can do.
このとき、第１脚部側第２屈曲部における屈曲角に対して第２脚部側第２屈曲部における屈曲角がより屈曲すると共に、当該ばねの重心位置が第１屈曲部を通り第１脚部側第２屈曲部および第２脚部側第２屈曲部が線対称となる対称軸上に配置されるように第３屈曲部が屈曲している。 At this time, the bending angle at the second leg-side second bending portion is further bent with respect to the bending angle at the first leg-side second bending portion, and the center of gravity of the spring passes through the first bending portion to be the first. The third bent portion is bent so that the leg-side second bent portion and the second leg-side second bent portion are arranged on the symmetry axis that is line-symmetric.
すなわち、第１脚部と第２脚部とは、形状上の対称性は崩れているものの、その重心がその対称軸となる中心線上にあり、重心安定性が保たれている。そのため、機械による組立工程でも、ふらつきを抑制して、ばねを治具まで送るパーツフィーダーにおいてばねを治具に安定して送ることができ、さらに、治具にばねが送られた後も、ばねを一時的に固定してモータハウジング内の所定位置にばねを正しく挿入することができる。 That is, the first leg and the second leg are not symmetrical in shape, but the center of gravity is on the center line that is the axis of symmetry, and the center of gravity stability is maintained. Therefore, even in the assembly process by the machine, it is possible to stably send the spring to the jig in the parts feeder that suppresses the wobble and sends the spring to the jig, and even after the spring is sent to the jig Can be temporarily fixed and the spring can be correctly inserted into a predetermined position in the motor housing.
このように、第１発明の磁石固定ばねによれば、機械によるモータの組立工程に組み込むことが可能となる。 Thus, according to the magnet fixing spring of the first invention, it can be incorporated in the assembly process of the motor by the machine.
第２発明の磁石固定ばねは、第１発明において、
前記第１屈曲部、前記第１脚部側第２屈曲部および前記第２脚部側第２屈曲部並びに前記第３屈曲部は、すべて鈍角であって、前記第１脚部および前記第２脚部の端部が前記対称軸に対して外向きとなっていることを特徴とする。
The magnet fixing spring of the second invention is the first invention,
The first bent portion, the first leg portion-side second bent portion, the second leg portion-side second bent portion, and the third bent portion are all obtuse angles, and the first leg portion and the second bend portion. The end of the leg is outward with respect to the axis of symmetry.
第２発明の磁石固定ばねによれば、第１〜第３屈曲部がすべて鈍角であり、第１脚部および第２脚部の端部が外向きとなっているため、第１脚部と第２脚部との間にパーツフィーダーの支持部や治具等を容易に挿入して配置することができる。これにより、より機械によるモータの組立工程に適した磁石固定ばねを提供することができる。 According to the magnet fixing spring of the second invention, the first to third bent portions are all obtuse angles, and the end portions of the first leg portion and the second leg portion are facing outward. A support part, a jig or the like of the parts feeder can be easily inserted and arranged between the second leg part. Thereby, the magnet fixing spring more suitable for the assembly process of the motor by a machine can be provided.
図１を参照して、本実施形態の磁石固定ばねについて説明する。 With reference to FIG. 1, the magnet fixed spring of this embodiment is demonstrated.
磁石固定ばねは、１本の弾性線状のばね材を加工してなるばねであって、第１屈曲部１と、第１屈曲部１により２つに分けられる第１脚部１１および第２脚部１２と、第１脚部１１および第２脚部１２のそれぞれに形成された第１脚部側第２屈曲部２および第２脚部側第２屈曲部２´と、第１脚部１１に形成された第３屈曲部３とを備える。 The magnet fixing spring is a spring formed by processing one elastic linear spring material, and includes a first bent portion 1, a first leg portion 11 divided into two parts by the first bent portion 1, and a second bent portion 1. Leg 12, first leg side second bent part 2 and second leg side second bent part 2 ' formed on each of first leg part 11 and second leg part 12, and first leg part And a third bent portion 3 formed on the head 11.
磁石固定ばねを構成するばね材は、例えば、金属製の線状部材であって、後述する所定の弾性力で磁石を付勢する。なお、ばね材の材質は金属に限られず、要求される弾性力や強度を満たすものであれば合成樹脂やセラミック素材等であってもよい。 The spring material constituting the magnet fixing spring is, for example, a metal linear member, and urges the magnet with a predetermined elastic force described later. The material of the spring material is not limited to metal, and may be a synthetic resin or a ceramic material as long as it satisfies the required elastic force and strength.
第１屈曲部１は、１本のばね材をその中間位置で屈曲させて、第１脚部１１および第２脚部１２を形成する。第１屈曲部１による第１脚部１１と第２脚部１２との間の角度は、約１５０度の鈍角であり、第１脚部１１および第２脚部１２はその端部が外向きとなっている。 The first bent portion 1 forms a first leg portion 11 and a second leg portion 12 by bending one spring material at an intermediate position thereof. The angle between the first leg portion 11 and the second leg portion 12 by the first bent portion 1 is an obtuse angle of about 150 degrees, and the end portions of the first leg portion 11 and the second leg portion 12 face outward. It has become.
第１脚部側第２屈曲部２は、第１脚部１１の第１屈曲部１側の部位であり、これに対応した第２脚部側第２屈曲部２´は、第２脚部１２の第１屈曲部１側の部位とをそれぞれ鈍角に屈曲させて、第１脚部１１および第２脚部１２をそれぞれ所定の開口角とする。所定の開口角度としては、後述するパーツフィーダーの支持部や治具等が第１脚部１１と第２脚部１２との間に挿入し易い角度である。 Second bend 2 is first leg portion is a portion of the first bending portion 1 side of the first leg 11, second bend the second leg portion 2 'corresponding to this, the second leg The first leg portion 11 and the second leg portion 12 are each set to a predetermined opening angle by bending the twelve portions of the first bent portion 1 side at an obtuse angle. The predetermined opening angle is an angle at which a support part, a jig or the like of a parts feeder described later can be easily inserted between the first leg part 11 and the second leg part 12.
例えば、第１脚部１１と第２脚部１２とは、それぞれ第１屈曲部１を通り第１脚部側第２屈曲部２、第２脚部側第２屈曲部２´が線対称となる対称軸ｍに対して開口角を有している。 For example, the first leg portion 11 and the second leg portion 12 pass through the first bent portion 1, respectively, and the first leg side second bent portion 2 and the second leg side second bent portion 2 ′ are line symmetrical. and with respect to the symmetry axis m has an opening angle made.
第３屈曲部３は、第１脚部１１の第２脚部とその端部との間に形成されて、第１脚部１１を僅かに屈曲させる。第３屈曲部３の屈曲角は鈍角であり、第１脚部１１は、例えば、約５度前後屈曲している。 The 3rd bending part 3 is formed between the 2nd leg part of the 1st leg part 11, and its edge part, and bends the 1st leg part 11 slightly. The bending angle of the third bent portion 3 is an obtuse angle, and the first leg portion 11 is bent, for example, about 5 degrees.
ここで、第１屈曲部１、第１脚部側第２屈曲部２、第２脚部側第２屈曲部２´および第３屈曲部３の位置および角度は、当該ばねの重心位置が対称軸ｍ上に配置されるように調整されている。すなわち、第１脚部側第２屈曲部２における屈曲角に対して第２脚部側第２屈曲部２´における屈曲角がより屈曲すると共に、当該ばねの重心位置が第１屈曲部１を通り第１脚部側第２屈曲部２および第２脚部側第２屈曲部２´が線対称となる対称軸ｍ上に配置されるように第３屈曲部３が屈曲している。 Here, the positions and angles of the first bent portion 1, the first leg side second bent portion 2 , the second leg side second bent portion 2 ', and the third bent portion 3 are symmetrical with respect to the center of gravity of the spring. It is adjusted so as to be arranged on the axis m. That is, the bending angle at the second leg-side second bending portion 2 ′ is further bent with respect to the bending angle at the first leg-side second bending portion 2, and the center of gravity of the spring causes the first bending portion 1 to be bent. The third bent portion 3 is bent so that the first leg-side second bent portion 2 and the second leg-side second bent portion 2 ′ are arranged on the axis of symmetry m having line symmetry.
以上のように構成された磁石固定ばねは、まずパーツフィーダーの帯状の支持部（図示省略）に第１脚部１１および第２脚部１２（正確には、第１脚部１１は第１屈曲部１と第１脚部側第２屈曲部２の間の部位、第２脚部１２は、対応する第１屈曲部１と第２脚部側第２屈曲部２´の間の部位）を掛けて、起立状態で支持される。 In the magnet fixing spring configured as described above, first, the first leg portion 11 and the second leg portion 12 (precisely, the first leg portion 11 is bent first) on the belt-like support portion (not shown) of the parts feeder. A portion between the portion 1 and the first leg-side second bent portion 2, and a second leg portion 12 is a corresponding portion between the first bent portion 1 and the second leg-side second bent portion 2 ′ ). Hanging and supported in an upright state.
このとき、磁石固定ばねは、第３屈曲部３により、形状上の対称性は崩れているものの、その重心がその対称軸ｍ上にあり、重心安定性が保たれている。そのため、ばねを治具まで送るパーツフィーダーにおいて、ふらつきを抑制して、ばねを治具まで送るパーツフィーダーにおいてばねを治具に安定して送ることができる。 At this time, although the symmetry of the shape of the magnet fixing spring is broken by the third bent portion 3, the center of gravity is on the axis of symmetry m, and the center of gravity stability is maintained. Therefore, in the parts feeder that sends the spring to the jig, the fluctuation can be suppressed, and the spring can be stably sent to the jig in the parts feeder that sends the spring to the jig.
また、第１屈曲部１、第１脚部側第２屈曲部２、第２脚部側第２屈曲部２´および第３屈曲部３は、すべて鈍角となっており、第１脚部１１および第２脚部１２はいずれも対称軸ｍに対して外向きとなっているため、パーツフィーダーの帯状の支持部に支持させ易い。 Further, the first bent portion 1, the first leg side second bent portion 2 , the second leg side second bent portion 2 ′, and the third bent portion 3 are all obtuse angles, and the first leg portion 11. Since both the second leg portion 12 and the second leg portion 12 face outward with respect to the symmetry axis m, the second leg portion 12 can be easily supported by the belt-like support portion of the parts feeder.
そして、磁石固定ばねは、図２（ａ）に示すように、支持部の傾斜角および微小振動により、起立状態のまま、モータの組立機械の治具Ｘに送られて、治具Ｘの係合部Ｙに係合して支持される。 As shown in FIG. 2 (a), the magnet fixing spring is sent to the jig X of the motor assembly machine in an upright state due to the inclination angle and minute vibration of the support portion, and the jig X is engaged. The joint Y is engaged and supported.
次いで、治具Ｘの係合部Ｙに係合して支持された磁石固定ばねは、図２（ｂ）に示すように、この状態のまま、起立状態となっているモータハウジングＺの下方（エンドカバー側）から上方（フロントカバー側）に向って、永久磁石Ｗ１，Ｗ２の間に挿入される。 Next, the magnet fixing spring that is supported by being engaged with the engaging portion Y of the jig X, as shown in FIG. It is inserted between the permanent magnets W1, W2 from the end cover side to the upper side (front cover side).
このとき、磁石固定ばねは、第３屈曲部３により、形状上の対称性は崩れているものの、その重心がその対称軸ｍ上にあり、重心安定性が保たれているため、ばねが治具に送られた後も、ばねを治具に一時的に固定してモータハウジング内の所定位置にばねを正しく挿入することができる。 At this time, the symmetry of the magnet fixing spring is broken by the third bent portion 3, but the center of gravity is on the axis of symmetry m and the stability of the center of gravity is maintained. Even after being sent to the tool, the spring can be temporarily fixed to the jig and the spring can be correctly inserted into a predetermined position in the motor housing.
また、第１屈曲部１、第１脚部側第２屈曲部２、第２脚部側第２屈曲部２´および第３屈曲部３は、すべて鈍角となっており、第１脚部１１および第２脚部１２はいずれも対称軸ｍに対して外向きとなっているため、ここでも治具の先端部を第１脚部１１と第２脚部１２の間に容易に挿入することができ、支持も容易となっている。 Further, the first bent portion 1, the first leg side second bent portion 2 , the second leg side second bent portion 2 ′, and the third bent portion 3 are all obtuse angles, and the first leg portion 11. Since both the second leg portion 12 and the second leg portion 12 face outward with respect to the axis of symmetry m, the tip of the jig can be easily inserted between the first leg portion 11 and the second leg portion 12 here as well. Can be supported easily.
なお、モータハウジング内のフロントカバー側には、モータハウジングの形状に沿った円形の溝部Ｖが形成されており、第１屈曲部１が溝部Ｖに嵌まり込むようにして当接する。 A circular groove V is formed along the shape of the motor housing on the front cover side in the motor housing, and the first bent portion 1 is brought into contact with the groove V so as to be fitted.
さらに、磁石固定ばねは、第１脚部１１の第１脚部側第２屈曲部２とその端部との間に第３屈曲部３が形成されているため、第１脚部１１と第２脚部１２との対称性が崩れており、例えば、第２脚部１２を全面で永久磁石と当接させることができ、両方の脚部１１，１２が永久磁石と点接触状態となることを回避することができる。 Further, the magnet fixing spring has the third bent portion 3 formed between the first leg portion-side second bent portion 2 of the first leg portion 11 and the end portion thereof, so that the first leg portion 11 and the first leg portion 11 The symmetry with the two leg portions 12 is broken, for example, the second leg portion 12 can be brought into contact with the permanent magnet over the entire surface, and both the leg portions 11 and 12 are in a point contact state with the permanent magnet. Can be avoided.
モータハウジング内に挿入された磁石固定ばねは、例えば、図３に示すように、円筒状のモータハウジングの内周面に沿って配置された２つ円弧状の永久磁石に対し、隣接する該永久磁石の相対向する端面の少なくとも一方の端面間において該端面を離反させる方向に付勢して、永久磁石を固定する。なお、本実施形態では、２つの永久磁石の他方の端面側には、これに係合する凸部がモータハウジングに形成されているが、他方の端面側も磁石固定ばねにより付勢して固定してもよい。 For example, as shown in FIG. 3, the magnet fixing spring inserted in the motor housing is adjacent to the two permanent magnets arranged along the inner peripheral surface of the cylindrical motor housing. The permanent magnet is fixed by urging the end faces between at least one of the opposing end faces of the magnet in a direction to separate the end faces. In the present embodiment, the other end face side of the two permanent magnets is formed with a convex portion that engages with the motor housing, but the other end face side is also urged and fixed by the magnet fixing spring. May be.
以上詳しく説明したように、本実施形態の磁石固定ばねによれば、第３屈曲部３により、形状上の対称性は崩れているものの、その重心がその対称軸ｍ上にあり、重心安定性が保たれているため、機械によるモータの組立工程に組み込むことが可能となる。 As described above in detail, according to the magnet fixing spring of this embodiment, although the symmetry on the shape is broken by the third bent portion 3, the center of gravity is on the symmetry axis m, and the center of gravity stability Therefore, it can be incorporated into a motor assembly process by a machine.
１…第１屈曲部、２…第１脚部側第２屈曲部、２´…第２脚部側第２屈曲部、３…第３屈曲部、１１…第１脚部、１２…第２脚部、ｍ…対称軸、Ｘ…治具、Ｙ…係合部、Ｚ…モータハウジング、Ｗ１，Ｗ２…永久磁石。
DESCRIPTION OF SYMBOLS 1 ... 1st bending part, 2 ... 1st leg part side 2nd bending part, 2 '... 2nd leg part side 2nd bending part, 3 ... 3rd bending part, 11 ... 1st leg part, 12 ... 2nd Leg part, m ... symmetry axis, X ... jig, Y ... engagement part, Z ... motor housing, W1, W2 ... permanent magnet.
Claims (2)
前記１本のばね材の中間位置に設けられ、その左右が第１脚部および第２脚部である第１屈曲部と、
前記第１脚部の前記第１屈曲部側の位置に設けられ、該第１屈曲部の屈曲方向と同じ方向に該第１脚部を屈曲させた第１脚部側第２屈曲部と、
前記第２脚部の前記第１屈曲部側の位置に設けられ、該第１屈曲部の屈曲方向と同じ方向に該第２脚部を屈曲させた第２脚部側第２屈曲部と、
前記第１脚部の前記第１脚部側第２屈曲部とその端部との間に設けられ、前記第１屈曲部の屈曲方向と同じ方向に該第１脚部を屈曲させた第３屈曲部と
を備え、
前記第１脚部側第２屈曲部における屈曲角に対して前記第２脚部側第２屈曲部における屈曲角がより屈曲すると共に、当該ばねの重心位置が前記第１屈曲部を通り該第１脚部側第２屈曲部および該第２脚部側第２屈曲部が線対称となる対称軸上に配置されるように前記第３屈曲部が屈曲していることを特徴とする磁石固定ばね。 A spring formed by processing a single elastic linear spring material, and a plurality of arc-shaped permanent magnets arranged along the inner peripheral surface of a cylindrical motor housing. In a magnet fixing spring that biases in a direction to separate the end faces between at least one of the opposing end faces,
Provided at an intermediate position of said one spring member, and the left and right first bent portion is a first leg and a second leg,
A first leg-side second bent portion that is provided at a position on the first bent portion side of the first leg portion and bent the first leg portion in the same direction as the bent direction of the first bent portion;
A second leg-side second bent portion that is provided at a position on the first bent portion side of the second leg portion and bent the second leg portion in the same direction as the bent direction of the first bent portion;
A third leg provided between the first leg side second bent part of the first leg part and the end part thereof, wherein the first leg part is bent in the same direction as the bending direction of the first bent part. With a bent portion,
With bending angle of the second leg-side second bend relative to the bending angle in the first leg side second bent portion is further bent, through the center of gravity position of the spring the first bent portion the first Magnet fixing, wherein the third bent portion is bent such that the second bent portion on the one leg side and the second bent portion on the second leg side are arranged on an axis of symmetry. Spring.
前記第１屈曲部、前記第１脚部側第２屈曲部および前記第２脚部側第２屈曲部並びに前記第３屈曲部は、すべて鈍角であって、前記第１脚部および前記第２脚部の端部が前記対称軸に対して外向きとなっていることを特徴とする磁石固定ばね。 The magnet fixing spring according to claim 1,
The first bent portion, the first leg portion-side second bent portion, the second leg portion-side second bent portion, and the third bent portion are all obtuse angles, and the first leg portion and the second bend portion. The magnet fixing spring, wherein an end of the leg is directed outward with respect to the axis of symmetry.
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| JPS6445478U (en) * | 1987-09-10 | 1989-03-20 | ||
| GB2209880B (en) * | 1987-09-16 | 1991-11-06 | Johnson Electric Ind Mfg | Magnet retainer in an electric motor |
| JP2001178032A (en) * | 1999-12-22 | 2001-06-29 | Asmo Co Ltd | Magnet-fixing spring |
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