JP2006217770A - Fastening structure of rotor core to shaft of motor - Google Patents

Fastening structure of rotor core to shaft of motor Download PDF

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JP2006217770A
JP2006217770A JP2005030489A JP2005030489A JP2006217770A JP 2006217770 A JP2006217770 A JP 2006217770A JP 2005030489 A JP2005030489 A JP 2005030489A JP 2005030489 A JP2005030489 A JP 2005030489A JP 2006217770 A JP2006217770 A JP 2006217770A
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shaft
rotor core
thin steel
motor
steel plate
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JP4602784B2 (en
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Tomohiro Kaneko
知博 金子
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Oriental Motor Co Ltd
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Oriental Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening structure of a rotor core to a shaft of a motor which are attached relieving a stress in a direction of an axial center, which is generated when the shaft is press fitted. <P>SOLUTION: In the fastening structure of the rotor core to the shaft of the motor, a plurality of thin steel plates with throughholes formed are laminated to form the rotor core of the motor, then the shaft is press fitted in a fitting hole formed at a center of the rotor core to attach, the throughholes 2a of the thin steel plates 2 are formed so that smaller diametrical portions r1 and larger diametrical portions r2 may be alternately formed along a circumferential direction, then the thin steel plates 2 are laminated to form the rotor core 1 so that the smaller diametrical portions r1 and the larger diametrical portions r2 of the throughholes 2a may be alternately formed in an axial direction. The shaft 4 with recessed and protruded portions 4a formed on an outer peripheral face is press fitted into the fitting hole 1a of the rotor core 1 to attach. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、モータのロータコアとシャフトの締結構造に関する。   The present invention relates to a fastening structure between a rotor core and a shaft of a motor.

一般に、モータの製造工程において、ロータの組立に際し、プレス加工により形成した中央部に貫通孔を有する複数枚の薄板鋼板を積層したロータコアに、シャフトを圧入してロータコアとシャフトを締結している。
近年、技術の向上に伴い、モータの低騒音・低振動化の要求が高まってきている。例えば、ロータコアにシャフトを圧入したモータにおいては、シャフトの傷付きによる軸受部の摺動音、含油メタルの油膜断絶によるロータコアの暴れ音、又、軸ずれによる騒音等が問題視されている。 In general, in a motor manufacturing process, when a rotor is assembled, a rotor core and a shaft are fastened by press-fitting a shaft into a rotor core in which a plurality of thin steel plates having a through-hole are stacked in a central portion formed by press working.
In recent years, with the improvement of technology, there has been an increasing demand for low noise and low vibration of motors. For example, in a motor in which a shaft is press-fitted into a rotor core, sliding noise of a bearing portion due to shaft damage, rotor core rampage due to oil film breakage of an oil-containing metal, noise due to shaft misalignment, and the like are regarded as problems.

このようなモータの騒音の防止対策の一つとして、例えば、シャフト圧入後のロータコアとシャフトとの軸ずれ及び傷付きの防止があげられる。図１０に示すように、モータのロータコアとして、円形状に形成された貫通孔５１を有する薄板鋼板５２を回転積層させてなるコア（ロータコア）５３がある。薄板鋼板５２は、鉄心単板からその外形が打ち抜かれ、その打ち抜き角度のまま略中央部に円形状の貫通孔５２が形成される。コア５３は、薄板鋼板５２を、その外形を基準として一定の回転角度で回転積層されて形成されている。その結果、形成されたコア５３の嵌合孔５４は、シャフト５５の軸方向に対して整列状態で形成されている。こうして形成されたコア５３の嵌合孔５４に、シャフト５５が圧入されている。   As one of measures for preventing such motor noise, for example, prevention of shaft misalignment and scratches between the rotor core and the shaft after press-fitting the shaft can be mentioned. As shown in FIG. 10, there is a core (rotor core) 53 formed by rotating and laminating thin steel plates 52 having through holes 51 formed in a circular shape as a rotor core of a motor. The thin steel plate 52 has an outer shape punched from a single iron core plate, and a circular through hole 52 is formed at a substantially central portion with the punching angle maintained. The core 53 is formed by rotating and laminating a thin steel plate 52 at a fixed rotation angle with reference to its outer shape. As a result, the formed fitting hole 54 of the core 53 is formed in an aligned state with respect to the axial direction of the shaft 55. A shaft 55 is press-fitted into the fitting hole 54 of the core 53 thus formed.

ところで、コア５３の嵌合孔５４にシャフト５５を圧入する工程において、シャフト５５の傷付き防止、廻りトルクの確保等により、嵌合孔５４の孔系は非常に厳しい精度が要求される。そして、コア５３を構成する複数の薄板鋼板５２は、それぞれ個別加工により貫通孔５１が形成されている。このため、上記のように外形を基準として複数の薄板鋼板５２を積層した場合、各薄板鋼板５２の貫通孔５１のバラツキ（孔形状及び孔位置）が発生する。このバラツキは、シャフト５５の嵌合に影響を与え、コア５３の嵌合孔５４の孔径を制御することは困難になる。このため、その嵌合孔５４にシャフト５５を圧入する際にそのシャフト５５の表面に傷付きが発生する虞があった（特許文献１参照）。   By the way, in the process of press-fitting the shaft 55 into the fitting hole 54 of the core 53, the hole system of the fitting hole 54 is required to have extremely strict accuracy in order to prevent the shaft 55 from being damaged and to secure a rotating torque. And the through-hole 51 is formed in the some thin steel plate 52 which comprises the core 53 by each individual processing. For this reason, when the some thin steel plate 52 is laminated | stacked on the basis of an external shape as mentioned above, the variation (hole shape and hole position) of the through-hole 51 of each thin plate steel plate 52 generate | occur | produces. This variation affects the fitting of the shaft 55, and it becomes difficult to control the diameter of the fitting hole 54 of the core 53. For this reason, when the shaft 55 is press-fitted into the fitting hole 54, the surface of the shaft 55 may be damaged (see Patent Document 1).

一方、図１１に示すように、コア１００を形成する薄板鋼板１０１の貫通孔１０１ａに直線部を形成した先行技術（特許文献２参照）が知られている。   On the other hand, as shown in FIG. 11, a prior art (see Patent Document 2) in which a straight portion is formed in a through hole 101a of a thin steel plate 101 forming a core 100 is known.

この貫通孔１０１ａは、図１２に示すように、内周面に半径ｒの円の円弧の一部を構成する円弧部Ａと直線部Ｂとを有している。円弧部Ａと直線部Ｂとは、周方向に４５度ずつの間隔をあけて周方向に交互に形成されている。直線部Ｂは両側の円弧部Ａの端部を連結するように形成されており、半径ｒの仮想円の内側に張り出た形になっている。   As shown in FIG. 12, the through-hole 101a has an arc portion A and a straight portion B that constitute a part of a circular arc having a radius r on the inner peripheral surface. The arc portions A and the straight portions B are alternately formed in the circumferential direction with an interval of 45 degrees in the circumferential direction. The straight line portion B is formed so as to connect the ends of the circular arc portions A on both sides, and has a shape projecting inside a virtual circle having a radius r.

そして、薄板鋼板１０１の貫通孔１０１ａを積層して形成されたコア１００の嵌入穴１００ａにシャフト１０２の嵌入部１０２ａを圧入して組み付けられる。
特開２００４−２３８４８号公報 特許第３４２３４８５号公報 Then, the fitting portion 102a of the shaft 102 is press-fitted and assembled into the fitting hole 100a of the core 100 formed by laminating the through holes 101a of the thin steel plate 101.
Japanese Patent Laid-Open No. 2004-23848 Japanese Patent No. 3423485

しかしながら、上記先行技術によると、コア１００の嵌入穴１００ａは薄板鋼板１０１の貫通孔１０１ａを積層して構成されるので、シャフト１０２の嵌入部１０２ａを圧入する際にコア１００の嵌入穴１００ａに接触する接触面は連続した形状になっていることから、シャフト１０２の嵌入部１０２ａの圧入方向に薄板鋼板１０１がたわまないので、過大な圧力を加えないと圧入することはできず、圧入した場合でも、コア１００またはシャフト１０２の嵌入部１０２ａに傷(焼き付き)が生じたり、シャフト１０２の嵌入部１０２ａが変形する虞があった。   However, according to the above prior art, the insertion hole 100a of the core 100 is configured by laminating the through-holes 101a of the thin steel plate 101. Therefore, when the insertion part 102a of the shaft 102 is press-fitted, the insertion hole 100a contacts the core 100. Since the contact surface to be formed has a continuous shape, the thin steel plate 101 does not bend in the press-fitting direction of the fitting portion 102a of the shaft 102, so press-fitting is not possible unless excessive pressure is applied. Even in this case, there is a possibility that the core 100 or the fitting portion 102a of the shaft 102 may be damaged (burned) or the fitting portion 102a of the shaft 102 may be deformed.

本発明は上記課題を解決し、シャフト圧入時に発生する応力を軸心方向に逃がして組付けることができるモータのロータコアとシャフトの締結構造を提供することを目的とする。   An object of the present invention is to solve the above-mentioned problems and to provide a fastening structure between a rotor core and a shaft of a motor that can be assembled by releasing stress generated during shaft press-fitting in the axial direction.

本発明は上記課題を解決するため、貫通孔を形成した複数枚の薄板鋼板を積層してモータのロータコアを形成し、このロータコアの中央に形成される嵌入穴にシャフトを圧入して組付けるモータのロータコアとシャフトの締結構造において、小径部と大径部が円周方向に沿って交互に形成されるようにして上記薄板鋼板の貫通孔を形成し、これら貫通孔の小径部と大径部が軸方向に交互に配置されるように上記薄板鋼板を積層して上記ロータコアを形成し、このロータコアの嵌入穴に、外周面に凹凸部を形成したシャフトを圧入して組付けたことにある。   In order to solve the above-mentioned problems, the present invention forms a rotor core of a motor by laminating a plurality of thin steel plates with through holes formed therein, and a motor that is assembled by press-fitting a shaft into a fitting hole formed at the center of the rotor core. In the fastening structure of the rotor core and the shaft, the through holes of the thin steel plate are formed so that the small diameter portions and the large diameter portions are alternately formed along the circumferential direction, and the small diameter portions and the large diameter portions of these through holes are formed. The thin steel plates are laminated to form the rotor core so as to be alternately arranged in the axial direction, and a shaft having a concavo-convex portion formed on the outer peripheral surface thereof is press-fitted and assembled into the insertion hole of the rotor core. .

本発明によれば、ロータコアの嵌入穴にシャフトを圧入して組付けるシャフト圧入時に発生する応力を軸心方向に逃がして組付けることができるので、ロータコアおよびシャフトに変形を生じることなく組付けることができる。   According to the present invention, since the stress generated when the shaft is press-fitted and fitted in the fitting hole of the rotor core can be released in the axial direction, the rotor core and the shaft can be assembled without causing deformation. Can do.

よって、組付けが容易で、かつ安価な部品を提供することができる。シャフトに接触している薄板鋼板に撓みが生じることで、接触面には常に圧力がかかり、より強固なシャフトへの拘束ができる。   Therefore, it is possible to provide an inexpensive part that is easy to assemble. By bending the thin steel plate in contact with the shaft, pressure is always applied to the contact surface, and the shaft can be restrained more firmly.

以下、図示の実施の形態を図面を参照しながら詳細に説明する。   Hereinafter, the illustrated embodiment will be described in detail with reference to the drawings.

図１において、１は、モータのロータコアで、図２に示すように貫通孔２ａを形成した複数枚の薄板鋼板２を積層して形成されている。薄板鋼板２は、図３に示すように、鉄板等の板材をプレス成形により打ち抜いてリング状に成形したもので、内側の貫通孔２ａには小径部ｒ１と大径部ｒ２が円周方向に沿って交互に形成されている。薄板鋼板２の貫通孔２ａは大径部ｒ２によって形成される溝部３ａと小径部ｒ１によって形成される凸部３ｂが円周方向に交互に、それぞれ９個ずつ形成されている。この薄板鋼板２を、例えば１８０°回転させて積み重ねることにより、溝部３ａの位置が１枚おきに一致するように配置される。   In FIG. 1, reference numeral 1 denotes a rotor core of a motor, which is formed by laminating a plurality of thin steel plates 2 having through holes 2a as shown in FIG. As shown in FIG. 3, the thin steel plate 2 is formed by punching a plate material such as an iron plate into a ring shape by press forming, and a small-diameter portion r1 and a large-diameter portion r2 are arranged in the circumferential direction in the inner through-hole 2a. It is formed alternately along. The through-hole 2a of the thin steel plate 2 is formed with nine groove portions 3a formed by the large diameter portion r2 and nine convex portions 3b formed by the small diameter portion r1 alternately in the circumferential direction. For example, by rotating the thin steel plates 2 by rotating 180 ° and stacking them, the positions of the grooves 3a are arranged so as to coincide with each other.

こうしてロータコア１は、軸方向に小径部ｒ１の凸部３ｂと大径部ｒ２の溝部３ａが交互に並ぶようにして複数枚の薄板鋼板２を、積層して形成されている(図２参照)。   Thus, the rotor core 1 is formed by laminating a plurality of thin steel plates 2 so that the convex portions 3b of the small diameter portion r1 and the groove portions 3a of the large diameter portion r2 are alternately arranged in the axial direction (see FIG. 2). .

４は、複数枚の薄板鋼板２の貫通孔２ａによって形成されるロータコア１の嵌入穴１ａに圧入して装着されたモータシャフトであり、このモータシャフト４は、ロータコア１の嵌入穴１ａに組付ける部分の外周面に、ローレット加工等によって凹凸部４ａが形成されている。モータシャフト４は、図４および図５に示すように、凹凸部４ａが薄板鋼板２の小径部ｒ１の凸部３ｂを撓ませて圧入され、凹凸部４ａが凸部３ｂに係合して組み付けられている。   Reference numeral 4 denotes a motor shaft that is press-fitted into a fitting hole 1 a of the rotor core 1 formed by the through-holes 2 a of the plurality of thin steel plates 2. The motor shaft 4 is assembled to the fitting hole 1 a of the rotor core 1. An uneven portion 4a is formed on the outer peripheral surface of the portion by knurling or the like. As shown in FIGS. 4 and 5, the motor shaft 4 is press-fitted with the concavo-convex portion 4a deflecting the convex portion 3b of the small-diameter portion r1 of the thin steel plate 2, and the concavo-convex portion 4a is engaged with the convex portion 3b and assembled. It has been.

薄板鋼板２の小径部ｒ１の凸部３ｂは、モータシャフト４の凹凸部４ａに、図６（ａ）（ｂ）に示すように、しめしろが、引っ掛かる寸法になっており、溝部３ａはモータシャフト４及びモータシャフト４の凹凸部４ａを逃げる寸法となっている。   As shown in FIGS. 6A and 6B, the convex portion 3b of the small-diameter portion r1 of the thin steel plate 2 has such a size that the interference is caught on the concave and convex portion 4a of the motor shaft 4 as shown in FIGS. The dimension is such that the uneven portion 4 a of the shaft 4 and the motor shaft 4 escapes.

つぎに、モータのロータコアとシャフトの締結構造の作用を説明する。   Next, the operation of the fastening structure between the rotor core and the shaft of the motor will be described.

複数枚の薄板鋼板２を例えば１８０°回転させて、隣接する薄板鋼板２の凸部３ｂ同士が重ならないようにして積み重ね、これら薄板鋼板２を図示しないボルトおよびナットを介して挟持することでロータコア１が形成される。   A plurality of thin steel plates 2 are rotated by, for example, 180 °, stacked so that the convex portions 3b of adjacent thin steel plates 2 do not overlap, and the thin steel plates 2 are sandwiched via bolts and nuts (not shown) to form a rotor core. 1 is formed.

そして、ロータコア１の嵌入穴１ａにモータシャフト４を圧入すると、薄板鋼板２の小径部ｒ１の凸部３ｂは、モータシャフト４の凹凸部４ａより径が小さいので、この嵌め合い部分に、重なり部分、所謂、しめしろが発生する。   When the motor shaft 4 is press-fitted into the fitting hole 1a of the rotor core 1, the convex portion 3b of the small-diameter portion r1 of the thin steel plate 2 has a smaller diameter than the concave-convex portion 4a of the motor shaft 4, so that the overlapping portion overlaps the fitting portion. So-called interference occurs.

こうして、モータシャフト４は凹凸部４ａが、薄板鋼板２の小径部ｒ１の凸部３ｂを撓ませながら凸部３ｂに係合して固定される（図６（ａ）（ｂ）参照）。   In this way, the motor shaft 4 is fixed by engaging the convex portion 3b with the concave and convex portion 4a bending the convex portion 3b of the small diameter portion r1 of the thin steel plate 2 (see FIGS. 6A and 6B).

図２のロータコア１に、図１のようにモータシャフト４を圧入すると、薄板鋼板２の小径部ｒ１の凸部３ｂにモータシャフト４の凹凸部４ａが接触する。図５の斜線部はモータシャフト４の凹凸部４ａが接触している箇所を示している。   When the motor shaft 4 is press-fitted into the rotor core 1 of FIG. 2 as shown in FIG. 1, the concavo-convex part 4 a of the motor shaft 4 comes into contact with the convex part 3 b of the small diameter part r 1 of the thin steel plate 2. The hatched portion in FIG. 5 indicates a portion where the uneven portion 4a of the motor shaft 4 is in contact.

薄板鋼板２は1枚ごとにモータシャフト４の凹凸部４ａと接触/非接触の状態で積層されている為、モータシャフト４と接触している薄板鋼板２は、軸方向へ自由に撓むことが出来る。圧入による応力は、図６（ａ）のように薄板鋼板２がたわむことで吸収され、又は図６（ｂ）のように、変形して逃げることで圧入され、圧入圧力は低減出来る。こうして、モータシャフト４とロータコア１に焼き付きは発生せず、曲がり等の変形が生じない。   Since each thin steel plate 2 is laminated in contact / non-contact with the concavo-convex portion 4a of the motor shaft 4, the thin steel plate 2 in contact with the motor shaft 4 is free to bend in the axial direction. I can do it. The stress due to the press-fitting is absorbed by the bending of the thin steel plate 2 as shown in FIG. 6A, or the press-fitting pressure can be reduced by deforming and escaping as shown in FIG. 6B. Thus, seizure does not occur in the motor shaft 4 and the rotor core 1, and deformation such as bending does not occur.

図７ないし図９は、図１ないし図４と同一部分は同符号を付して示す本発明の他の実施の形態で、薄板鋼板２の溝の数を変えたものである。   7 to 9 show another embodiment of the present invention in which the same parts as those in FIGS. 1 to 4 are indicated by the same reference numerals, and the number of grooves in the thin steel plate 2 is changed.

薄板鋼板２の積層については、回転させて積層しなくても、金型上で形状の異なる内径の薄板鋼板２を交互に打抜き、これを積層して形成してもよい。   The lamination of the thin steel plates 2 may be formed by alternately punching the thin steel plates 2 having different inner diameters on the mold and laminating them without being rotated and laminated.

回転積層する場合、内径に設ける溝は奇数/偶数どちらでもよく、連続する薄板鋼板２の凸部３ｂ同士が重ならないように、回転させて、分割数にあわせ、溝数を決めればよい(図７および図８参照)。   When rotating and laminating, the number of grooves provided on the inner diameter may be either odd or even, and the number of grooves may be determined according to the number of divisions by rotating so that the convex portions 3b of the continuous thin steel plate 2 do not overlap each other (see FIG. 7 and FIG. 8).

図７（ａ）に示すように、５個の奇数の溝３ａが形成された薄板鋼板２を使用する場合は、薄板鋼板２を例えば１８０°回転させて積層させることで、溝３ａの位置と、凸部３ｂの位置が隣同士で異なるように積層されることになる(図７（ｂ）（ｃ）参照)。   As shown in FIG. 7A, in the case of using the thin steel plate 2 in which five odd-numbered grooves 3a are formed, the thin steel plate 2 is rotated by, for example, 180.degree. The protrusions 3b are stacked so that the positions of the protrusions 3b are different from each other (see FIGS. 7B and 7C).

また、図８（ａ）に示すように、６個の偶数の溝３ａが形成された薄板鋼板２を使用する場合は、薄板鋼板２を９０°回転させて積層させることで、溝３ａの位置と、凸部３ｂの位置が隣同士で異なるように積層されることになる(図８（ｂ）（ｃ）参照)。   Further, as shown in FIG. 8 (a), when using the thin steel plate 2 on which six even-numbered grooves 3a are formed, the position of the groove 3a is determined by rotating the thin steel plate 2 by 90.degree. Then, the protrusions 3b are stacked so that the positions of the protrusions 3b are different from each other (see FIGS. 8B and 8C).

薄板鋼板２の内径に溝を設ける事が出来ない場合は、図９（ａ）（ｂ）に示すように、小径の貫通孔２ｂと、大径の貫通孔２ｃを形成した薄板鋼板２を交互に積層してもよい。   When a groove cannot be provided in the inner diameter of the thin steel plate 2, as shown in FIGS. 9 (a) and 9 (b), the thin steel plates 2 having the small diameter through holes 2b and the large diameter through holes 2c are alternately arranged. May be laminated.

上記実施の形態によるモータのロータコアとシャフトの締結構造によれば、以下に列挙する効果が得られる。   According to the fastening structure of the rotor core and the shaft of the motor according to the above embodiment, the following effects can be obtained.

薄板鋼板２は1枚ごとにモータシャフト４の凹凸部４ａと接触/非接触の状態で積層されている為、モータシャフト４と接触している薄板鋼板２は、軸方向へ自由に撓むことが出来るので、部品に変形が生じない。よって、部品の高精度化や後加工がなくなるかとから、安価な部品を提供することができる。   Since each thin steel plate 2 is laminated in contact / non-contact with the concavo-convex portion 4a of the motor shaft 4, the thin steel plate 2 in contact with the motor shaft 4 is free to bend in the axial direction. Can be made, so the parts will not be deformed. Therefore, it is possible to provide an inexpensive component because it is possible to improve the accuracy of the component and eliminate post-processing.

薄板鋼板２の凸部３ｂがたわむことで吸収され、又は凸部３ｂが変形して逃げることで圧入されるので、圧入圧力は低減出来る。こうして、モータシャフト４とロータコア１に焼き付きは発生せず、曲がり等の変形が生じない。
シャフト４に接触している薄板鋼板２にタワミ(弾性変形)が生じる事で、常に接触面には圧力がかかり(スプリングバック)、より強固なシャフト４ヘの拘束が出来る。 Since the convex portion 3b of the thin steel plate 2 is absorbed when it is bent, or the convex portion 3b is deformed and escapes, it is press-fitted, so that the press-fitting pressure can be reduced. Thus, seizure does not occur in the motor shaft 4 and the rotor core 1, and deformation such as bending does not occur.
When the sheet steel plate 2 in contact with the shaft 4 is distorted (elastically deformed), pressure is always applied to the contact surface (spring back), and the shaft 4 can be restrained more firmly.

安価な部品を提供・交互に積層する為、ローターコア１に単純な溝が形成されない為、切削加工等で生じる加エクズ等(切粉)が、内部に入り込まないことからロックや異音の不具合を生じない。   Since inexpensive parts are provided and laminated alternately, no simple grooves are formed in the rotor core 1, so that extruding (chips) generated by cutting or the like does not enter the interior, causing problems with locks and abnormal noise. Does not occur.

シャフト４が接触するロータコア１内径部の凸部３ｂは、円形の一部である為、ゲージ等での寸法管理がしやすく真円度管理もしやすい。
シャフト４とローターコア１の接触部に焼き付きが生じず、しかもローターコア１内径全周がたわみの作用でシャフト４に接触する為、シャフト４とロータコア１の軸ずれを抑える事が出来ることから、振動の低減を行うことができる。 Since the convex part 3b of the inner diameter part of the rotor core 1 with which the shaft 4 comes into contact is a part of a circle, it is easy to manage the dimensions with a gauge or the like and to manage the roundness.
Since the seizure does not occur in the contact portion between the shaft 4 and the rotor core 1 and the entire inner circumference of the rotor core 1 is in contact with the shaft 4 due to the deflection, the axial deviation between the shaft 4 and the rotor core 1 can be suppressed. Vibration can be reduced.

なお、本発明は、上記実施の形態にのみ限定されるものではなく、例えば、モータシャフト４の凹凸部４ａはローレット加工に限らずスプライン加工を施しても良い。また、薄板鋼板２の貫通孔２ａの、大径部ｒ２によって形成される溝部３ａと小径部ｒ１２によって形成される凸部３ｂの数は、必要に応じて任意に設定することができ、薄板鋼板２の枚数も必要に応じて設定することができる。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得ることは言うまでもない。   In addition, this invention is not limited only to the said embodiment, For example, the uneven | corrugated | grooved part 4a of the motor shaft 4 may give not only a knurling process but a spline process. Moreover, the number of the groove part 3a formed by the large diameter part r2 and the convex part 3b formed by the small diameter part r12 of the through-hole 2a of the thin steel sheet 2 can be arbitrarily set as required. The number of sheets 2 can also be set as required. In addition, it goes without saying that the present invention can be appropriately modified and implemented within the scope not changing the gist of the present invention.

本発明によるモータのロータコアとシャフトの締結構造の実施の形態を示す断面図である。It is sectional drawing which shows embodiment of the fastening structure of the rotor core and shaft of a motor by this invention. 図１のロータコアを示す斜視図である。It is a perspective view which shows the rotor core of FIG. 図２のロータコアを構成する薄板鋼板の貫通孔の一部を示す概念図である。It is a conceptual diagram which shows a part of through-hole of the thin steel plate which comprises the rotor core of FIG. ロータコアとモータシャフトの締結部を示す拡大図である。It is an enlarged view which shows the fastening part of a rotor core and a motor shaft. モータシャフトがロータコアの凸部に接触する部分を示す概念図である。It is a conceptual diagram which shows the part which a motor shaft contacts the convex part of a rotor core. ロータコアに、モータシャフトを圧入した際の薄板鋼板の変形状態を示し、図６（ａ）は、薄板鋼板がたわむことで吸収される状態を示す断面図、図６（ｂ）は、薄板鋼板が変形して逃げることでモータシャフトが圧入される状態を示す断面図である。6A shows a deformed state of the thin steel plate when the motor shaft is press-fitted into the rotor core, FIG. 6A is a cross-sectional view showing a state in which the thin steel plate is absorbed, and FIG. 6B shows the thin steel plate. It is sectional drawing which shows the state in which a motor shaft is press-fit by deform | transforming and escaping. 本発明の他の実施の形態で、（ａ）は５個(奇数)の溝を形成した薄板鋼板を示す平面図、（ｂ）は（ａ）の薄板鋼板を積層して形成されるロータコアを示す平面図、（ｃ）は（ｂ）の縦断面図である。In another embodiment of the present invention, (a) is a plan view showing a thin steel plate in which five (odd) grooves are formed, and (b) is a rotor core formed by laminating the thin steel plates of (a). The top view to show, (c) is a longitudinal cross-sectional view of (b). 本発明の他の実施の形態で、（ａ）は６個(偶数)の溝を形成した薄板鋼板を示す平面図、（ｂ）は（ａ）の薄板鋼板を積層して形成されるロータコアを示す平面図、（ｃ）は（ｂ）の縦断面図である。In another embodiment of the present invention, (a) is a plan view showing a thin steel plate in which six (even) grooves are formed, and (b) is a rotor core formed by laminating the thin steel plates of (a). The top view to show, (c) is a longitudinal cross-sectional view of (b). 本発明の他の実施の形態で、（ａ）は径の異なる貫通孔を形成した薄板鋼板を積層して形成されるロータコアを示す平面図、（ｂ）は（ａ）の縦断面図である。In other embodiment of this invention, (a) is a top view which shows the rotor core formed by laminating | stacking the thin steel plate which formed the through-hole from which a diameter differs, (b) is a longitudinal cross-sectional view of (a). . 従来のロータコアとモータシャフトの締結部を示す分解斜視図である。It is a disassembled perspective view which shows the fastening part of the conventional rotor core and a motor shaft. 従来のロータコアとモータシャフトの締結部を示す分解斜視図である。It is an exploded perspective view which shows the fastening part of the conventional rotor core and a motor shaft. 図１１の薄板鋼板の貫通孔を示す概念図である。It is a conceptual diagram which shows the through-hole of the thin steel plate of FIG.

符号の説明Explanation of symbols

１ ロータコア
１ａ 嵌入穴
２ 薄板鋼板
２ａ 貫通孔
３ａ 溝部
３ｂ 凸部
４ モータシャフト
４ａ 凹凸部
ｒ１ 小径部
ｒ２ 大径部 DESCRIPTION OF SYMBOLS 1 Rotor core 1a Insertion hole 2 Thin steel plate 2a Through-hole 3a Groove part 3b Convex part 4 Motor shaft 4a Concavity and convexity r1 Small diameter part r2 Large diameter part

Claims (3)

貫通孔を形成した複数枚の薄板鋼板を積層してモータのロータコアを形成し、このロータコアの中央に形成される嵌入穴にシャフトを圧入して組付けるモータのロータコアとシャフトの締結構造において、小径部と大径部が円周方向に沿って交互に形成されるようにして上記薄板鋼板の貫通孔を形成し、これら貫通孔の小径部と大径部が軸方向に交互に配置されるように上記薄板鋼板を積層して上記ロータコアを形成し、このロータコアの嵌入穴に、外周面に凹凸部を形成したシャフトを圧入して組付けたことを特徴とするモータのロータコアとシャフトの締結構造。 In the motor rotor core and shaft fastening structure in which a plurality of thin steel plates with through holes are laminated to form a rotor core of the motor and the shaft is press-fitted into the fitting hole formed at the center of the rotor core, the small diameter The through holes of the thin steel plate are formed so that the portions and the large diameter portions are alternately formed along the circumferential direction, and the small diameter portions and the large diameter portions of the through holes are alternately arranged in the axial direction. A structure for fastening a rotor core and a shaft of a motor, wherein the thin steel plate is laminated to form the rotor core, and a shaft having an uneven surface is press-fitted into the fitting hole of the rotor core and assembled. . 上記凹凸部としてシャフトにローレット加工を施したことを特徴とする請求項１に記載のモータのロータコアとシャフトの締結構造。 The fastening structure of the rotor core and shaft of the motor according to claim 1, wherein the shaft is knurled as the uneven portion. 上記凹凸部としてシャフトにスプライン加工を施したことを特徴とする請求項１に記載のモータのロータコアとシャフトの締結構造。 The fastening structure of the rotor core and shaft of the motor according to claim 1, wherein the shaft is splined as the uneven portion.
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WO2020148048A1 (en) * 2019-01-18 2020-07-23 Siemens Aktiengesellschaft Joining a laminated core to a shaft
EP3683933A1 (en) * 2019-01-18 2020-07-22 Siemens Aktiengesellschaft Joining of a stack of metal sheets on a shaft
JP2020162392A (en) * 2019-03-28 2020-10-01 アイシン精機株式会社 Rotary electric machine
FR3104849A1 (en) 2019-12-17 2021-06-18 Nidec Psa Emotors Rotating electric machine rotor
WO2021123539A1 (en) 2019-12-17 2021-06-24 Nidec Psa Emotors Rotor of a rotary electric machine
US11750052B2 (en) 2021-02-17 2023-09-05 Toyota Jidosha Kabushiki Kaisha Rotating electric machine rotor
DE102021205713A1 (en) 2021-05-31 2022-12-01 Valeo Eautomotive Germany Gmbh Rotor for an electric machine
CN113726053A (en) * 2021-11-02 2021-11-30 威晟汽车科技(宁波)有限公司 Rotor structure of automobile electronic water pump
WO2023194083A1 (en) 2022-04-07 2023-10-12 Robert Bosch Gmbh Rotor of an electric machine
DE102022203531A1 (en) 2022-04-07 2023-10-12 Robert Bosch Gesellschaft mit beschränkter Haftung Rotor of an electric machine

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