JP2016182013A - Outer rotor type motor and manufacturing method of the same - Google Patents

Outer rotor type motor and manufacturing method of the same Download PDF

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JP2016182013A
JP2016182013A JP2015061994A JP2015061994A JP2016182013A JP 2016182013 A JP2016182013 A JP 2016182013A JP 2015061994 A JP2015061994 A JP 2015061994A JP 2015061994 A JP2015061994 A JP 2015061994A JP 2016182013 A JP2016182013 A JP 2016182013A
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rotor
yoke
shaft
press
piece
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JP6247655B2 (en
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令士 牧野
Reiji Makino
令士 牧野
正好 星野
Masayoshi Hoshino
正好 星野
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Shinano Kenshi Co Ltd
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Shinano Kenshi Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an outer rotor type motor that reduces a top surface deflection by improving the squareness between a rotor shaft and a rotor yoke.SOLUTION: The outer rotor type motor is so configured that a yoke opening side of a yoke top surface part 10c of a rotor yoke 10 formed in a cup shape is supported by overlapping with a receiving piece 16, a rotor shaft 9 is press fit into a shaft hole 10b from a yoke opening side by pressing a shaft hole outer peripheral edge part on the opposite side of a receiving piece support surface with a press piece 14, and the rotor shaft 9 is integrally assembled to the rotor yoke 10 by applying forging press to the shaft hole outer peripheral edge part with the press piece 14.SELECTED DRAWING: Figure 3

Description

本発明は、例えばOA機器、家電製品、産業機器などに用いられるアウターロータ型モータ及びその製造方法に関する。   The present invention relates to an outer rotor type motor used for, for example, OA equipment, home appliances, industrial equipment, and the like, and a manufacturing method thereof.

アウターロータ型のDCブラシレスモータの一例について説明する。
固定子の構造について説明する。筒状に形成されたハウジングの軸孔には、焼結金属よりなる筒状のメタル含油軸受が同軸状に組み付けられている。このハウジングの一端側外周には、外周側に向かって放射状に突設された極歯にコイルが巻かれた固定子コアが組み付けられる。固定子コアは樹脂塗装により絶縁された極歯に銅線を巻き付けてコイルが形成されている。また、ハウジングの他端側には取付板が一体に形成されている。取付板にはモータ基板が組み付けられている。
An example of an outer rotor type DC brushless motor will be described.
The structure of the stator will be described. A cylindrical metal oil-impregnated bearing made of sintered metal is coaxially assembled in a shaft hole of the housing formed in a cylindrical shape. A stator core in which a coil is wound around pole teeth projecting radially toward the outer peripheral side is assembled to the outer periphery on one end side of the housing. The stator core has a coil formed by winding a copper wire around pole teeth insulated by resin coating. A mounting plate is integrally formed on the other end side of the housing. A motor board is assembled to the mounting plate.

次に、回転子の一例について説明する。図6に示すように、カップ状に形成された回転子ヨーク51の中心部には真鍮などの合金を切削加工して形成された回転子ハブ52には、回転子軸53の一端側が圧入固定されている。この回転ハブ52にカップ状に形成された回転子ヨーク51がかしめられて一体に組み付けられている。回転子ヨーク51の内周面には、周方向に多極着磁されたリング状のマグネット54が組み付けられている。回転子は、回転子軸53を図示しない固定子ハウジングの軸孔に組み付けられた軸受の軸孔に挿入されて、マグネット54が固定子コアの極歯と対向配置されて組み付けられる。   Next, an example of the rotor will be described. As shown in FIG. 6, one end of a rotor shaft 53 is press-fitted and fixed to a rotor hub 52 formed by cutting an alloy such as brass at the center of a rotor yoke 51 formed in a cup shape. Has been. A rotor yoke 51 formed in a cup shape is caulked to the rotating hub 52 and assembled integrally. On the inner peripheral surface of the rotor yoke 51, a ring-shaped magnet 54 magnetized in the circumferential direction is assembled. The rotor is assembled by inserting a rotor shaft 53 into a shaft hole of a bearing assembled in a shaft hole of a stator housing (not shown), and a magnet 54 is arranged to face the pole teeth of the stator core.

或いは、図7に示すように、カップ状に形成された回転子ヨーク51の中心部には、カップ開口側に向けて筒状のボス部51aが起立形成されている。このボス部51aには、軸孔51b(貫通孔)が形成されている。軸孔51bには回転子軸53が圧入により一体に組み付けられている。回転子ヨーク51の内周壁には、周方向に多極着磁されたリング状のマグネット54が一体に組み付けられている。   Alternatively, as shown in FIG. 7, a cylindrical boss portion 51a is erected at the center of the rotor yoke 51 formed in a cup shape toward the cup opening side. A shaft hole 51b (through hole) is formed in the boss portion 51a. A rotor shaft 53 is integrally assembled in the shaft hole 51b by press-fitting. On the inner peripheral wall of the rotor yoke 51, a ring-shaped magnet 54 magnetized in the circumferential direction is integrally assembled.

以上のように、図6に示すように、回転子軸53は回転子ハブ52に圧入した後、回転子ハブ52を回転子ヨーク51とかしめ固定されるか、図7に示すように回転子軸53は直接回転子ヨーク51に圧入固定されている。
また、回転子に搭載されるポリゴンミラーの面倒れや上下振動を防ぐため、予め回転子軸と直交する方向に一体形成されたヨーク部にマグネットを組み付けたスキャナモータも提案されている(特許文献1参照)。或いは、回転子ヨークに対する軸直角度が低下するのを防ぐため、シャフトとカップ状バックヨークを圧入結合した後、これらをダイキャスト結合したブラシレスモータも提案されている(特許文献2参照)。
As described above, as shown in FIG. 6, after the rotor shaft 53 is press-fitted into the rotor hub 52, the rotor hub 52 is caulked and fixed to the rotor yoke 51, or as shown in FIG. The shaft 53 is directly press-fitted and fixed to the rotor yoke 51.
In addition, a scanner motor has been proposed in which a magnet is assembled to a yoke unit integrally formed in advance in a direction orthogonal to the rotor axis in order to prevent surface tilt and vertical vibration of a polygon mirror mounted on the rotor (Patent Document). 1). Alternatively, a brushless motor has also been proposed in which a shaft and a cup-shaped back yoke are press-fitted and then die-cast to prevent a reduction in the perpendicularity to the rotor yoke (see Patent Document 2).

特開平7−241056号公報Japanese Patent Laid-Open No. 7-241056 特開2013−29086号公報JP 2013-29086 A

図6に示す回転子軸53を回転子ハブ52に圧入した後、回転子ハブ52を回転子ヨーク51とかしめ固定する場合には、部品点数が多いためコスト高になるうえに回転子ハブ52の切削加工や回転子ハブ52と回転子軸53の圧入プレス加工、更には回転子ハブ52と回転子ヨーク51とのかしめ加工など工数が多く製造コストが嵩むという課題がある。   When the rotor shaft 53 shown in FIG. 6 is press-fitted into the rotor hub 52 and then the rotor hub 52 is caulked and fixed to the rotor yoke 51, the number of parts is large and the cost is increased. There is a problem that the manufacturing cost is increased due to a large number of man-hours such as cutting of the above, press-fitting of the rotor hub 52 and the rotor shaft 53, and caulking of the rotor hub 52 and the rotor yoke 51.

また、図7に示す回転子軸53を直接回転子ヨーク51に圧入固定する場合には、回転子軸53基準の回転子ヨーク51の直角度は軸孔51bとヨーク天面部51cとの直角度に依存してしまい組み立て規格を満たすことができない。これは、圧入治具により回転子ヨーク51のヨーク天面部51cをクランプして、ヨーク天面部51cと軸孔51bとの直角度を弾性変形により強制しているため、圧入後に回転子ヨーク51がスプリングバックしてもとの形態に戻ってしまうことが考えられる。   When the rotor shaft 53 shown in FIG. 7 is directly press-fitted and fixed to the rotor yoke 51, the perpendicularity of the rotor yoke 51 with respect to the rotor shaft 53 is the perpendicularity between the shaft hole 51b and the yoke top surface portion 51c. The assembly standard cannot be satisfied. This is because the yoke top surface portion 51c of the rotor yoke 51 is clamped by a press-fitting jig, and the perpendicularity between the yoke top surface portion 51c and the shaft hole 51b is forced by elastic deformation. It may be possible to return to the original form even after springback.

また、特許文献1のように回転子軸と直交するヨーク部を一体形成するのは、加工コストが嵩み現実的ではないうえに、特許文献2のようにシャフトとカップ状バックヨークを圧入結合した後、これらをダイキャスト結合する場合には、工数が増えるうえにプレス装置のみならず金型鋳造設備を要し設備コストが嵩む。   In addition, it is not practical to integrally form a yoke portion orthogonal to the rotor shaft as in Patent Document 1, and it is not practical because of the high processing cost. In addition, the shaft and the cup-shaped back yoke are press-fitted together as in Patent Document 2. Then, when these are die-casted, man-hours are increased, and not only a press device but also a die casting facility is required, resulting in an increase in equipment cost.

本発明はこれらの課題を解決すべくなされたものであり、その目的とするところは、回転子軸と回転子ヨークとの直角度を向上させて天面振れを減少させたアウターロータ型モータ及び回転性能を向上させたアウターロータ型モータを安価に量産可能なアウターロータ型モータの製造方法を提供することにある。   The present invention has been made to solve these problems, and an object of the present invention is to provide an outer rotor type motor in which the perpendicularity between the rotor shaft and the rotor yoke is improved to reduce the top runout, and An object of the present invention is to provide a method for manufacturing an outer rotor type motor capable of mass-producing an outer rotor type motor with improved rotational performance at low cost.

本発明は上記目的を達成するため、次の構成を備える。
カップ状に成形された回転子ヨークの中心部に形成された軸孔に回転子軸が圧入された回転子が、固定子ハウジングに設けられた軸受を介して前記回転子軸が回転可能に軸支されたアウターロータ型モータであって、前記回転子ヨークをヨーク天面部のヨーク開口側を受け駒に重ねて支持され、当該ヨーク天面部の受け駒支持面と反対側の軸孔外周縁部を押し駒により押圧されて前記ヨーク開口側から前記回転子軸が前記軸孔に圧入され、かつ前記押し駒によって前記軸孔外周縁部を鍛造されて前記回転子ヨークに前記回転子軸が一体に組み付けられていることを特徴とする。
In order to achieve the above object, the present invention comprises the following arrangement.
A rotor in which a rotor shaft is press-fitted into a shaft hole formed in a central portion of a rotor yoke formed in a cup shape is configured such that the rotor shaft can rotate via a bearing provided in a stator housing. A supported outer rotor type motor, wherein the rotor yoke is supported by being overlapped with a receiving piece on the yoke opening side of the yoke top surface portion, and the outer peripheral edge portion of the shaft hole opposite to the receiving piece support surface of the yoke top surface portion The rotor shaft is pressed into the shaft hole from the yoke opening side, and the outer peripheral edge of the shaft hole is forged by the push piece so that the rotor shaft is integrated with the rotor yoke. It is characterized by being assembled in.

上述したアウターロータ型モータを用いれば、回転子軸が回転子ヨークの軸孔に圧入され、かつ軸孔外周縁部を押し駒によって鍛造されて回転子ヨークに回転子軸が一体に組み付けられているので、回転子軸と回転子ヨークの軸直角度が高く、鍛造プレスによりスプリングバックなどの弾性変形を防いで回転安定性の高いアウターロータ型モータを提供することができる。   If the outer rotor type motor described above is used, the rotor shaft is press-fitted into the shaft hole of the rotor yoke, and the outer peripheral edge of the shaft hole is forged by the pushing piece, and the rotor shaft is assembled integrally with the rotor yoke. Therefore, it is possible to provide an outer rotor type motor having a high rotational stability by preventing the elastic deformation of the spring back and the like by a forging press with a high perpendicularity of the rotor shaft and the rotor yoke.

カップ状に成形された回転子ヨークの中心部に形成された軸孔に回転子軸が圧入された回転子が、固定子ハウジングに設けられた軸受を介して前記回転子軸が回転可能に軸支されたアウターロータ型モータの製造方法であって、回転子軸を筒状ブッシュに挿入して直立姿勢で保持する工程と、前記筒状ブッシュの外周側に同心状に配置された受け駒に、前記回転子ヨークをヨーク開口側から重ね合わせてヨーク天面部を受け部によって支持する工程と、前記ヨーク天面部の上方に配置された押し駒によって前記回転子ヨークを前記受け駒と共に押し下げることで前記軸孔に前記回転子軸を相対的に上昇させて圧入する工程と、前記回転子軸を前記軸孔に圧入したまま前記押し駒と前記受け駒によって前記ヨーク天面部をクランプしたまま前記押し駒による更なる押圧により前記軸孔外周縁部を鍛造する工程と、を含むことを特徴とする。   A rotor in which a rotor shaft is press-fitted into a shaft hole formed in a central portion of a rotor yoke formed in a cup shape is configured such that the rotor shaft can rotate via a bearing provided in a stator housing. A method of manufacturing a supported outer rotor type motor, comprising: a step of inserting a rotor shaft into a cylindrical bush and holding it in an upright position; and a receiving piece arranged concentrically on the outer peripheral side of the cylindrical bush A step of superimposing the rotor yoke from the yoke opening side and supporting the yoke top surface portion by the receiving portion, and pushing down the rotor yoke together with the receiving piece by a pushing piece disposed above the yoke top surface portion. A step of relatively raising and pressing the rotor shaft into the shaft hole; and the yoke top surface portion is clamped by the push piece and the receiving piece while the rotor shaft is press-fitted into the shaft hole. Characterized in that by further pressing by to pieces and a step of forging the shaft Anagai periphery.

上記アウターロータ型モータの製造方法を用いれば、押し駒と受け駒によって回転子ヨークの軸孔に回転子軸を圧入する圧入工程に続いて、押し駒と受け駒によってヨーク天面部をクランプしたまま押し駒の更なる押圧により軸孔外周縁部を鍛造することにより、回転子軸と回転子ヨークとの直角度を向上させて天面振れを減少させるとともに、加工後のスプリングバック等の弾性変形を防いで加工精度を維持することができる。また、同一のプレス設備を用いて1回のプレス動作で回転子軸と回転子ヨークを組み立てることができるので、回転子を安価に効率良く量産することができる。   If the manufacturing method of the outer rotor type motor is used, the yoke top surface portion is clamped by the pressing piece and the receiving piece, after the press-fitting step of pressing the rotor shaft into the shaft hole of the rotor yoke by the pushing piece and the receiving piece. By forging the outer peripheral edge of the shaft hole by further pressing of the push piece, the perpendicularity between the rotor shaft and the rotor yoke is improved to reduce the top runout and elastic deformation such as spring back after processing. The processing accuracy can be maintained by preventing. Further, since the rotor shaft and the rotor yoke can be assembled by a single press operation using the same press equipment, the rotor can be mass-produced efficiently at low cost.

また、前記押し駒には、前記回転子軸の軸端面に当接する中子が押し駒本体より所定量突出するように付勢支持されており、前記押し駒本体の前記ヨーク天面部への押圧によって前記中子が前記回転子軸の軸端面に当接したまま前記受け駒が相対移動することにより前記中子が前記回転子軸によって前記押し駒本体内へ押し込まれて圧入されるのが好ましい。
更には、前記回転子軸を前記ヨーク天面部と端面を揃えるまで軸孔に圧入する際に、前記中子が前記押し駒本体内に収納される突出量吸収分だけ前記ヨーク天面部の軸孔外周縁部を前記押し駒によって鍛造するのが好ましい。
これにより、押し駒本体より突出して付勢支持される中子の突出量を調整しておくことで、1回のプレス動作により回転子ヨークへの回転子軸の圧入と回転子ヨークのヨーク天面部に対する鍛造が同じタイミングで実現できるので、回転子の天面振れの少ない回転性能を向上させたアウターロータ型モータを安価な製造設備でコストを削減して量産することができる。
Further, the push piece is biased and supported so that a core contacting the shaft end surface of the rotor shaft protrudes from the push piece main body by a predetermined amount, and the push piece main body is pressed against the yoke top surface portion. It is preferable that the core is pushed into the push piece main body by the rotor shaft and press-fitted by the relative movement of the receiving piece while the core is in contact with the shaft end surface of the rotor shaft. .
Further, when the rotor shaft is press-fitted into the shaft hole until the end surface of the yoke top surface is aligned, the shaft hole of the yoke top surface portion is absorbed by the amount of protrusion that the core is housed in the push piece body. It is preferable that the outer peripheral edge is forged by the pushing piece.
As a result, by adjusting the protrusion amount of the core that protrudes from the main body of the pushing piece and is urged and supported, the rotor shaft is press-fitted into the rotor yoke by one press operation and the yoke ceiling of the rotor yoke is adjusted. Since the forging of the surface portion can be realized at the same timing, the outer rotor type motor with improved rotational performance with less rotor top surface swing can be mass-produced at low cost with low-cost manufacturing equipment.

上述したアウターロータ型モータを用いれば、回転子軸と回転子ヨークとの直角度を向上させて天面振れを減少させたアウターロータ型モータを提供することができる。
また、回転性能を向上させたアウターロータ型モータを安価に量産することが可能なアウターロータ型モータの製造方法を提供することができる。
By using the outer rotor type motor described above, it is possible to provide an outer rotor type motor in which the perpendicularity between the rotor shaft and the rotor yoke is improved and the top runout is reduced.
In addition, it is possible to provide a method for manufacturing an outer rotor type motor capable of mass-producing an outer rotor type motor with improved rotational performance at low cost.

アウターロータ型DCブラシレスモータの断面説明図である。It is a section explanatory view of an outer rotor type DC brushless motor. 図1の回転子ヨークに回転子軸を組み付ける工程を示す状態説明図である。It is a state explanatory view showing the process of assembling the rotor shaft to the rotor yoke of FIG. 図2に続く回転子ヨークに回転子軸を組み付ける工程を示す状態説明図及び一部拡大断面図である。FIG. 3 is a state explanatory view and a partially enlarged sectional view showing a process of assembling the rotor shaft to the rotor yoke following FIG. 2. 鍛造加工の有無に対する回転子ヨークの天面振れ量の対比を示す表図である。It is a table | surface figure which shows the contrast of the top face runout amount of the rotor yoke with respect to the presence or absence of forging. 図4のデータをヒストグラムに表した表図である。FIG. 5 is a table showing the data of FIG. 4 in a histogram. 従来の回転子軸と回転子ヨークとの組み付け構造を示す断面説明図である。It is sectional explanatory drawing which shows the assembly | attachment structure of the conventional rotor shaft and a rotor yoke. 従来の回転子軸と回転子ヨークとの組み付け構造を示す断面説明図である。It is sectional explanatory drawing which shows the assembly | attachment structure of the conventional rotor shaft and a rotor yoke.

以下、本発明に係るアウターロータ型モータの実施形態について、添付図面を参照しながら説明する。本実施形態では、アウターロータ型DCブラシレスモータを用いて説明する。   Hereinafter, embodiments of an outer rotor type motor according to the present invention will be described with reference to the accompanying drawings. In this embodiment, an outer rotor type DC brushless motor will be described.

図1を参照して、アウターロータ型DCブラシレスモータの概略構成について説明する。固定子1の構造について説明する。筒状に形成されたハウジング2の軸孔2aには、焼結金属よりなる筒状のメタル含油軸受3が同軸状に組み付けられている。このハウジング2の一端側端部2b及び外周部に沿って固定子コア4がその中心孔4aに形成された段付き部4bを当接させて接着固定されている。固定子コア4は、積層コアであり、平面視で外周側に向かって放射状に突設された極歯4cの周囲にモータコイル5が巻かれている。   A schematic configuration of an outer rotor type DC brushless motor will be described with reference to FIG. The structure of the stator 1 will be described. A cylindrical metal oil-impregnated bearing 3 made of sintered metal is coaxially assembled in a shaft hole 2a of the housing 2 formed in a cylindrical shape. The stator core 4 is bonded and fixed along the one end side end 2b and the outer peripheral portion of the housing 2 by bringing a stepped portion 4b formed in the center hole 4a into contact therewith. The stator core 4 is a laminated core, and a motor coil 5 is wound around pole teeth 4c that project radially toward the outer periphery in a plan view.

また、ハウジング2の他端側は径方向外側に延設された基板受け部2cが形成されている。基板受け部2cにはモータ基板6が固定されている。モータ基板6には、ホール素子等を搭載したセンサ基板(図示せず)が設けられる。ハウジング2の他端側は中心孔に後述する回転子軸9が駆動伝達する取付部7が圧入され若しくはかしめられて組み付けられる。   Further, the other end side of the housing 2 is formed with a substrate receiving portion 2c extending outward in the radial direction. A motor substrate 6 is fixed to the substrate receiving portion 2c. The motor substrate 6 is provided with a sensor substrate (not shown) on which a Hall element or the like is mounted. The other end of the housing 2 is assembled by press-fitting or caulking a mounting portion 7 to which a rotor shaft 9 (described later) is driven and transmitted into a center hole.

次に図1において回転子8の構造について説明する。回転子軸9の一端側は、カップ状に形成された回転子ヨーク10の中心部に開口側に起立形成された筒状のボス部10aの軸孔10b(貫通孔)に圧入固定されている。この回転子軸9は、後述するように回転子ヨーク10の軸孔10bに対して圧入プレスされ、更にヨーク天面部10cの軸孔10bの外周縁部を鍛造プレスされて一体に組み付けられている。   Next, the structure of the rotor 8 will be described with reference to FIG. One end side of the rotor shaft 9 is press-fitted and fixed into a shaft hole 10b (through hole) of a cylindrical boss portion 10a that is erected on the opening side at the center portion of a rotor yoke 10 formed in a cup shape. . As will be described later, the rotor shaft 9 is press-fitted into the shaft hole 10b of the rotor yoke 10, and the outer peripheral edge portion of the shaft hole 10b of the yoke top surface portion 10c is forged pressed and assembled together. .

回転子ヨーク10は金属磁性体(例えば亜鉛めっき鋼板)を絞り加工してカップ状に成形したものが用いられる。この回転子ヨーク10の内周面には、周方向にN極S極が交互に多極着磁されたリング状のマグネット11が組み付けられている。マグネット11の軸方向の長さは固定子コア4の極歯4cの軸方向の長さより大きなサイズのものが用いられる。固定子1を組立てた後、回転子8の回転子軸9がメタル含油軸受3を挿通して嵌め込まれる。このとき、固定子コア4の極歯4cとマグネット11が対向するように組み付けられる。回転子8は、マグネット11が対向する固定子極歯4cと磁気吸引されて組み付けられ、回転子軸10がハウジング2にメタル含油軸受3を介して回転可能に軸支されている。   The rotor yoke 10 is formed by drawing a metal magnetic material (for example, a galvanized steel plate) into a cup shape. A ring-shaped magnet 11 in which N poles and S poles are alternately magnetized in the circumferential direction is assembled on the inner peripheral surface of the rotor yoke 10. The magnet 11 has a length in the axial direction larger than the length in the axial direction of the pole teeth 4 c of the stator core 4. After assembling the stator 1, the rotor shaft 9 of the rotor 8 is inserted through the metal oil-impregnated bearing 3. At this time, the stator core 4 is assembled so that the pole teeth 4c and the magnet 11 face each other. The rotor 8 is magnetically attracted and assembled with the stator pole teeth 4 c facing the magnet 11, and the rotor shaft 10 is rotatably supported by the housing 2 via the metal oil-impregnated bearing 3.

ここで回転子8の回転子軸9と回転子ヨーク10との組み付け工程について図2及び図3を参照して説明する。
先ず、プレス用ダイセットの一例について説明する。図示しないダイプレートに対してパンチプレートがガイドポストにガイドされてプレス動作(接離動)するようになっている。また、ダイプレートとパンチプレートとの間には中間プレート17(ストリッパプレート)がガイドポストにコイルばね等によってダイプレート上に付勢支持されている。
Here, the assembly process of the rotor shaft 9 of the rotor 8 and the rotor yoke 10 will be described with reference to FIGS.
First, an example of a press die set will be described. A punch plate is guided by a guide post with respect to a die plate (not shown) so as to perform a pressing operation (contact / separation movement). An intermediate plate 17 (stripper plate) is urged and supported on the guide plate by a coil spring or the like between the die plate and the punch plate.

図2(A)において、図示しないダイプレートには、受けブロック13が設けられている。この受けブロック13は、起立姿勢の回転子軸9の端部を支持する。また図示しないパンチプレートには、押し駒14が設けられている。押し駒14は、押し駒本体14a内に、中子14bが挿入されている。中子14bは、先端部が押し駒本体14aの押圧面14cよりに突出するようにコイルばね14dにより付勢支持されている。中子14bは、後述するように回転子軸9の軸端面と当接する。   In FIG. 2A, a receiving block 13 is provided on a die plate (not shown). The receiving block 13 supports the end portion of the rotor shaft 9 in a standing posture. A push plate 14 is provided on a punch plate (not shown). The push piece 14 has a core 14b inserted in the push piece main body 14a. The core 14b is urged and supported by a coil spring 14d so that the tip portion protrudes from the pressing surface 14c of the pressing piece main body 14a. The core 14b contacts the shaft end surface of the rotor shaft 9 as will be described later.

中間プレート17には、筒状ブッシュ15及び該筒状ブッシュ15の周囲に受け駒16が同心状に配置されている。筒状ブッシュ15は、受け駒16の中心孔(貫通孔)16aの下方に支持されている。筒状ブッシュ15は回転子軸9を受けブロック13上に起立姿勢で保持する。受け駒16にはカップ状の回転子ヨーク10をヨーク開口側から重ね合わせ(図2(B)参照)、ヨーク天面部10cが受け部16bで支持されるように装着される(図2(C)参照)。尚、回転子ヨーク10の中心部にヨーク開口側に突設されたボス部10aは、受け駒16の中心孔16a内に挿入されるため受け部16bと干渉することはない。   In the intermediate plate 17, a cylindrical bush 15 and a receiving piece 16 are arranged concentrically around the cylindrical bush 15. The cylindrical bush 15 is supported below the center hole (through hole) 16 a of the receiving piece 16. The cylindrical bush 15 receives the rotor shaft 9 and holds it on the block 13 in a standing posture. A cup-shaped rotor yoke 10 is stacked on the receiving piece 16 from the yoke opening side (see FIG. 2B), and the yoke top surface portion 10c is mounted so as to be supported by the receiving portion 16b (FIG. 2C )reference). Note that the boss portion 10a protruding from the yoke opening side at the center of the rotor yoke 10 is inserted into the center hole 16a of the receiving piece 16, so that it does not interfere with the receiving portion 16b.

図2(A)に示すように、中間プレート17の受け駒16の中心孔16a内に同心状に設けられた筒状ブッシュ15に回転子軸9を上方から挿入する。回転子軸9の下端部は受けブロック13に支持されて筒状ブッシュ15に直立姿勢で保持される。   As shown in FIG. 2A, the rotor shaft 9 is inserted from above into a cylindrical bush 15 provided concentrically in the center hole 16a of the receiving piece 16 of the intermediate plate 17. The lower end portion of the rotor shaft 9 is supported by the receiving block 13 and is held on the cylindrical bush 15 in an upright posture.

次いで、図2(B)に示すように、受け駒16にカップ状に成形された回転子ヨーク10をヨーク開口側からセットし、中心孔16aの周縁部に設けられた受け部16bによってヨーク天面部10cを支持する。   Next, as shown in FIG. 2 (B), the rotor yoke 10 formed in a cup shape on the receiving piece 16 is set from the yoke opening side, and the yoke ceiling is formed by the receiving portion 16b provided at the peripheral portion of the center hole 16a. The surface portion 10c is supported.

図2(C)に示すように、回転子ヨーク10の上方に配置された押し駒14を下動させて、中子14bを軸孔10bに挿入すると共に押し駒本体14aの押圧面14cをヨーク天面部10cに押し当てたまま、押し駒14を押し下げることによって、回転子ヨーク10を受け駒16と共に中間プレート17の付勢に抗して押し下げる。このとき、軸孔10bには回転子軸9の上端がヨーク開口側(下方側)から挿入されており回転子軸9が相対的に押し上げられるため軸端面が中子14bと当接して、当該中子14bをコイルばね14d(図2(A)参照)の付勢力に抗して押し駒本体14a内に押し戻しながら軸孔10b内に回転子軸9が圧入されてゆく(圧入工程)。   As shown in FIG. 2 (C), the push piece 14 disposed above the rotor yoke 10 is moved downward to insert the core 14b into the shaft hole 10b and the push face 14c of the push piece main body 14a to the yoke. The rotor yoke 10 is pushed down against the biasing of the intermediate plate 17 together with the receiving piece 16 by pushing down the pushing piece 14 while being pressed against the top surface portion 10c. At this time, since the upper end of the rotor shaft 9 is inserted into the shaft hole 10b from the yoke opening side (lower side) and the rotor shaft 9 is relatively pushed up, the shaft end surface comes into contact with the core 14b, The rotor shaft 9 is press-fitted into the shaft hole 10b while the core 14b is pushed back into the pushing piece main body 14a against the urging force of the coil spring 14d (see FIG. 2A) (press-fitting process).

次に、図3(A)に示すように、回転子軸9を軸孔10b圧入したまま、押し駒14の押圧面14cと受け駒16の受け部16bによって回転子ヨーク10のヨーク天面部10cをクランプしたまま、押し駒14による更なる押圧により軸孔10bの外周縁部を鍛造する(鍛造工程)。   Next, as shown in FIG. 3A, the yoke top surface portion 10c of the rotor yoke 10 is pressed by the pressing surface 14c of the push piece 14 and the receiving portion 16b of the receiving piece 16 while the rotor shaft 9 is press-fitted in the shaft hole 10b. The outer peripheral edge portion of the shaft hole 10b is forged by further pressing by the push piece 14 while being clamped (forging process).

具体的には、図3(B)の拡大図に示すように、ヨーク天面部10cを受け部16bで受けたまま、押し駒本体14a(押圧面14c)のヨーク天面部10cへの更なる押圧によって押圧面14cと接するヨーク天面部10cが下方へ押し下げられる。これにより、中子14bが回転子軸9に当接したまま相対的に押し駒本体14a内へ押し込まれ、回転子軸9をヨーク天面部10cと端面を揃えるまで軸孔10bに圧入する。このとき、中子14bが押し駒本体14a内に収納される突出量吸収分(例えば30μm程度)だけヨーク天面部10cの軸孔10bの外周縁部を押し駒14(押圧面14c)によって鍛造する。実験によれば、ヨーク天面部10cに、軸孔10bと同心円状の打痕がわずかに残る。   Specifically, as shown in the enlarged view of FIG. 3B, while the yoke top surface portion 10c is received by the receiving portion 16b, the pressing piece main body 14a (pressing surface 14c) is further pressed to the yoke top surface portion 10c. As a result, the yoke top surface portion 10c in contact with the pressing surface 14c is pushed downward. As a result, the core 14b is relatively pushed into the pushing piece main body 14a while being in contact with the rotor shaft 9, and the rotor shaft 9 is press-fitted into the shaft hole 10b until the end surface of the yoke top surface portion 10c is aligned. At this time, the outer peripheral edge portion of the shaft hole 10b of the yoke top surface portion 10c is forged by the push piece 14 (pressing surface 14c) by the amount of protrusion absorption (for example, about 30 μm) that the core 14b is accommodated in the push piece main body 14a. . According to the experiment, a slight dent concentric with the shaft hole 10b remains on the yoke top surface portion 10c.

これにより、押し駒本体14aより突出して付勢支持される中子14bの突出量を調整しておくことで、1回のプレス動作により回転子ヨーク10への回転子軸9の圧入プレスと回転子ヨーク10のヨーク天面部10cに対する鍛造プレスが同じタイミングで実現できるので、回転子8の天面振れの少ない回転性能を向上させたアウターロータ型モータを安価な製造設備でコストを削減して量産することができる。   Thus, by adjusting the protrusion amount of the core 14b that protrudes from the push piece main body 14a and is urged and supported, the press-fitting press and rotation of the rotor shaft 9 to the rotor yoke 10 is performed by one press operation. Since the forging press for the yoke top surface portion 10c of the child yoke 10 can be realized at the same timing, the outer rotor type motor with improved rotational performance with little top surface deflection of the rotor 8 is mass-produced with low cost manufacturing equipment. can do.

ちなみに、回転子軸9の圧入プレスのみ行った回転子ヨーク10のサンプル30個と圧入プレス及び鍛造プレスを行った回転子ヨーク10のサンプル30個の圧入前後の天面振れを表にまとめたものを図4に示す。いずれの場合も回転子軸9の圧入前より圧入後の回転子ヨーク10の方が天面振れが減少していることがわかる。また、鍛造プレスを伴ったサンプルの方が圧入プレスのみ行ったサンプルより天面振れの度合いがより低くなっていることがわかる。   By the way, the top runout before and after press-fitting of 30 samples of the rotor yoke 10 subjected only to the press-fitting press of the rotor shaft 9 and 30 samples of the rotor yoke 10 subjected to the press-fitting press and forging press are summarized in a table. Is shown in FIG. In any case, it can be seen that the top runout is reduced in the rotor yoke 10 after press-fitting than before the rotor shaft 9 is press-fitted. It can also be seen that the sample with the forging press has a lower degree of top runout than the sample with only the press-fitting press.

図5(A)(B)は、図4のデータをヒストグラム(度数分布表)として表した図である。図5(A)は圧入プレスのみ行った回転子ヨーク10のサンプル30個のヒストグラムであり、図5(B)は圧入プレス及び鍛造プレスを行った回転子ヨーク10のサンプル30個のヒストグラムである。
この結果、圧入プレスのみ行った回転子ヨーク10の場合、回転子軸9の圧入前後の天面振れが平均値で30μm程度から16μm程度に改善するのに対し、圧入プレス及び鍛造プレスを行った回転子ヨーク10の場合、回転子軸9の圧入前後の天面振れが平均値で37μm程度から10μm程度に改善し、天面振れの度合いが著しく改善していることが判明した。
5A and 5B are diagrams showing the data of FIG. 4 as a histogram (frequency distribution table). FIG. 5A is a histogram of 30 samples of the rotor yoke 10 subjected only to press-fitting press, and FIG. 5B is a histogram of 30 samples of the rotor yoke 10 subjected to press-fitting press and forging press. .
As a result, in the case of the rotor yoke 10 subjected only to the press-fitting press, the top runout before and after the press-fitting of the rotor shaft 9 is improved from about 30 μm to about 16 μm on the average, whereas the press-fitting press and the forging press were performed. In the case of the rotor yoke 10, the top runout before and after the press-fitting of the rotor shaft 9 was improved from an average of about 37 μm to about 10 μm, and it was found that the top runout was remarkably improved.

以上より、アウターロータ型モータの回転子8においては、鍛造プレス方法を用いることで、回転子軸9と回転子ヨーク10の軸直角度が良くなり、回転安定性を高めることができる。
また、同一のプレス設備を用いて1回のプレス動作で回転子軸9と回転子ヨーク10を組み立てることができるので、回転子8を安価に効率良く量産することができる。
As described above, in the rotor 8 of the outer rotor type motor, by using the forging press method, the axis perpendicularity between the rotor shaft 9 and the rotor yoke 10 is improved, and the rotation stability can be improved.
Further, since the rotor shaft 9 and the rotor yoke 10 can be assembled by a single press operation using the same press equipment, the rotor 8 can be mass-produced efficiently at low cost.

上記アウターロータ型DCブラシレスモータは、OA機器、家電製品、産業機器など幅広い機器の駆動源として用いられる。   The outer rotor type DC brushless motor is used as a drive source for a wide range of equipment such as OA equipment, home appliances, and industrial equipment.

1 固定子 2 ハウジング 2a 軸孔 2b 端部 2c 基板受け部 3 メタル含油軸受 4 固定子コア 4a 中心孔 4b 段付き部 4c 極歯 5 モータコイル 6 モータ基板 7 取付部 8 回転子 9 回転子軸 10 回転子ヨーク 10a ボス部 10b 軸孔 10c ヨーク天面部 11 マグネット 13 受けブロック 14 押し駒 14a 押し駒本体 14b 中子 14c 押圧面 14d コイルばね 15 筒状ブッシュ 16 受け駒 16a 中心孔 16b 受け部 17 中間プレート   DESCRIPTION OF SYMBOLS 1 Stator 2 Housing 2a Shaft hole 2b End 2c Substrate receiving part 3 Metal oil-impregnated bearing 4 Stator core 4a Center hole 4b Stepped part 4c Pole teeth 5 Motor coil 6 Motor board 7 Mounting part 8 Rotor 9 Rotor shaft 10 Rotor yoke 10a Boss portion 10b Shaft hole 10c Yoke top surface portion 11 Magnet 13 Receiving block 14 Pushing piece 14a Pushing piece main body 14b Core 14c Pressing surface 14d Coil spring 15 Cylindrical bush 16 Receiving piece 16a Center hole 16b Receiving portion 17 Intermediate plate

Claims (4)

カップ状に成形された回転子ヨークの中心部に形成された軸孔に回転子軸が圧入された回転子が、固定子ハウジングに設けられた軸受を介して前記回転子軸が回転可能に軸支されたアウターロータ型モータであって、
前記回転子ヨークをヨーク天面部のヨーク開口側を受け駒に重ねて支持され、当該ヨーク天面部の受け駒支持面と反対側の軸孔外周縁部を押し駒により押圧されて前記ヨーク開口側から前記回転子軸が前記軸孔に圧入され、かつ前記押し駒によって前記軸孔外周縁部を鍛造されて前記回転子ヨークに前記回転子軸が一体に組み付けられていることを特徴とするアウターロータ型モータ。
A rotor in which a rotor shaft is press-fitted into a shaft hole formed in a central portion of a rotor yoke formed in a cup shape is configured such that the rotor shaft can rotate via a bearing provided in a stator housing. A supported outer rotor type motor,
The rotor yoke is supported on the yoke opening side of the yoke top surface portion so as to overlap the receiving piece, and the outer peripheral edge portion of the shaft hole opposite to the receiving piece support surface of the yoke top surface portion is pressed by the pushing piece to the yoke opening side. The rotor shaft is press-fitted into the shaft hole, and the outer peripheral edge of the shaft hole is forged by the push piece, and the rotor shaft is integrally assembled with the rotor yoke. Rotor type motor.
カップ状に成形された回転子ヨークの中心部に形成された軸孔に回転子軸が圧入された回転子が、固定子ハウジングに設けられた軸受を介して前記回転子軸が回転可能に軸支されたアウターロータ型モータの製造方法であって、
回転子軸を筒状ブッシュに挿入して直立姿勢で保持する工程と、
前記筒状ブッシュの外周側に同心状に配置された受け駒に、前記回転子ヨークをヨーク開口側から重ね合わせてヨーク天面部を受け部によって支持する工程と、
前記ヨーク天面部の上方に配置された押し駒によって前記回転子ヨークを前記受け駒と共に押し下げることで前記軸孔に前記回転子軸を相対的に上昇させて圧入する工程と、
前記回転子軸を前記軸孔に圧入したまま前記押し駒と前記受け駒によって前記ヨーク天面部をクランプしたまま前記押し駒による更なる押圧により前記軸孔外周縁部を鍛造する工程と、を含むことを特徴とするアウターロータ型モータの製造方法。
A rotor in which a rotor shaft is press-fitted into a shaft hole formed in a central portion of a rotor yoke formed in a cup shape is configured such that the rotor shaft can rotate via a bearing provided in a stator housing. A method of manufacturing a supported outer rotor type motor,
Inserting the rotor shaft into the cylindrical bush and holding it in an upright position;
A step of superimposing the rotor yoke from the yoke opening side on a receiving piece disposed concentrically on the outer peripheral side of the cylindrical bush and supporting the yoke top surface portion by a receiving portion;
Pressing the rotor yoke together with the receiving piece by a pushing piece disposed above the yoke top surface portion so that the rotor shaft is relatively raised and press-fitted into the shaft hole;
Forging the outer peripheral edge of the shaft hole by further pressing with the push piece while clamping the yoke top surface portion with the push piece and the receiving piece while the rotor shaft is press-fitted into the shaft hole. A method of manufacturing an outer rotor type motor.
前記押し駒には、前記回転子軸の軸端面に当接する中子が押し駒本体より所定量突出するように付勢支持されており、前記押し駒本体の前記ヨーク天面部への押圧によって前記中子が前記回転子軸の軸端面に当接したまま前記受け駒が相対移動することにより前記中子が前記回転子軸によって前記押し駒本体内へ押し込まれて圧入される請求項2記載のアウターロータ型モータの製造方法。   The push piece is biased and supported so that a core contacting the shaft end surface of the rotor shaft protrudes a predetermined amount from the push piece main body, and the pressing piece main body is pressed against the yoke top surface portion. The core is pushed into the push-piece body by the rotor shaft and press-fitted by the relative movement of the receiving piece while the core is in contact with the shaft end surface of the rotor shaft. Manufacturing method of outer rotor type motor. 前記回転子軸を前記ヨーク天面部と端面を揃えるまで軸孔に圧入する際に、前記中子が前記押し駒本体内に収納される突出量吸収分だけ前記ヨーク天面部の軸孔外周縁部を前記押し駒によって鍛造する請求項3記載のアウターロータ型モータの製造方法。   When the rotor shaft is press-fitted into the shaft hole until the end surface of the yoke top surface is aligned, the outer periphery of the shaft hole of the yoke top surface portion is absorbed by the amount of protrusion that the core is accommodated in the push piece body. The method for manufacturing an outer rotor type motor according to claim 3, wherein the outer rotor type motor is forged by the push piece.
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Publication number Priority date Publication date Assignee Title
WO2018154931A1 (en) * 2017-02-22 2018-08-30 シナノケンシ株式会社 Centrifugal pump

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JP2004282912A (en) * 2003-03-17 2004-10-07 Japan Servo Co Ltd Brushless motor
JP2007295794A (en) * 2006-04-20 2007-11-08 Samsung Electro Mech Co Ltd Jig for rotor assembly

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JP2004282912A (en) * 2003-03-17 2004-10-07 Japan Servo Co Ltd Brushless motor
JP2007295794A (en) * 2006-04-20 2007-11-08 Samsung Electro Mech Co Ltd Jig for rotor assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018154931A1 (en) * 2017-02-22 2018-08-30 シナノケンシ株式会社 Centrifugal pump
CN109154309A (en) * 2017-02-22 2019-01-04 信浓绢糸株式会社 centrifugal pump

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