JP2012202547A - Bearing structure of outer rotor type in-wheel motor - Google Patents

Bearing structure of outer rotor type in-wheel motor Download PDF

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JP2012202547A
JP2012202547A JP2011070790A JP2011070790A JP2012202547A JP 2012202547 A JP2012202547 A JP 2012202547A JP 2011070790 A JP2011070790 A JP 2011070790A JP 2011070790 A JP2011070790 A JP 2011070790A JP 2012202547 A JP2012202547 A JP 2012202547A
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bearing
outer rotor
wheel motor
rotor type
motor
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Hiroshi Yoshida
寛 吉田
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SIM-DRIVE CORP
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SIM-DRIVE CORP
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To form a bearing for an outer rotor type in-wheel motor in a small and light construction, wherein: ride quality of the vehicle equipped with such bearings is improved when the vehicle is traveling on a poor conditioned road; and the traveling performance of the vehicle is improved.SOLUTION: The bearing structure of the outer rotor type in-wheel motor to be mounted on an electric vehicle is configured so that: a bearing box 3 is installed inside the bore part of a stator 11 in an integrated structure; inside the bearing box 3, a double-row angular ball bearing 2 and a rotation sensor 4 are arranged in series in the axial direction; and the axle 12a of the outer rotor part 12 is supported via the angular ball bearing 2.

Description

本発明は、電気自動車に装備されるアウタロータ式インホイールモータの軸受構造に関する。   The present invention relates to a bearing structure for an outer rotor type in-wheel motor installed in an electric vehicle.

図３は従来の車輪軸受装置を示しており、これは車輪固定用のフランジ１００ａを有するハブ１００の外輪軌道と、懸架装置に支持される取付部を外周面に有する外輪相当部１０１の内輪軌道の間に、玉列（ボール列）１０２、１０２を適宜な間隔を開けて設置し、外輪相当部１０１の内側にハブ１００を回転自在に支持した構成のものである（例えば特許文献１参照）。   FIG. 3 shows a conventional wheel bearing device, which is an outer ring raceway of a hub 100 having a wheel fixing flange 100a and an inner ring raceway of an outer ring equivalent portion 101 having a mounting portion supported by a suspension device on an outer peripheral surface. In this structure, ball rows (ball rows) 102 and 102 are installed at appropriate intervals, and the hub 100 is rotatably supported inside the outer ring equivalent portion 101 (see, for example, Patent Document 1). .

特開２００３−２３２３４３号公報JP 2003-232343 A

前記図示したようなモータ軸受では、ラジアル荷重を受けるために前記二つの単列玉軸受１０２、１０２を配置する場合が多いが、その軸受でタイヤ反力を支持する車輪軸受を兼ねると、軸力を支持するために、前記軸受１０２、１０２として負荷容量が大きな大型のものを用いる必要があり、両軸受１０２、１０２の配置間隔も大きく確保する必要がある。   In the motor bearing as shown in the figure, the two single-row ball bearings 102 and 102 are often arranged to receive a radial load. However, if the bearing also serves as a wheel bearing that supports the tire reaction force, the axial force In order to support the bearing, it is necessary to use a large bearing having a large load capacity as the bearings 102 and 102, and it is necessary to ensure a large arrangement interval between the bearings 102 and 102.

前記構成のモータ軸受をアウタロータ式インホイールモータに適用した場合、モータの車軸と車輪から大きな力がかかっても固定子部とアウタロータ部の電磁素子間の間隔が一定に保持されるようにするには、スラスト方向の荷重を支えるために大型の玉軸受を用いなければならず、且つ単列玉軸受の配置間隔を大きく広げる必要があることに変わりはなく、必然的にモータ軸受は大型にならざるを得ない。インホイールモータを装備した電気自動車にあっては、モータ軸受が大型且つ重量の場合、ばね下重量に起因する悪路における乗り心地が悪化してしまい、また、懸架装置において操舵軸（キングピン軸）と車両中心間の距離（キングピンオフセット）が大きくなって車両の走行性能を低下させる。車両の走行性を向上するには、キングピンオフセットを小さくして駆動力、制動力及び路面外乱による車両の回頭を抑制する必要がある。   When the motor bearing having the above configuration is applied to an outer rotor type in-wheel motor, the gap between the electromagnetic elements of the stator portion and the outer rotor portion is kept constant even when a large force is applied from the axle and wheels of the motor. However, large ball bearings must be used to support the load in the thrust direction, and the arrangement interval of the single row ball bearings must be greatly increased. I must. In an electric vehicle equipped with an in-wheel motor, if the motor bearing is large and heavy, the riding comfort on the rough road due to unsprung weight deteriorates, and the steering shaft (kingpin shaft) in the suspension system The distance between the vehicle and the center of the vehicle (kingpin offset) is increased and the running performance of the vehicle is degraded. In order to improve the running performance of the vehicle, it is necessary to reduce the turning of the vehicle due to the driving force, the braking force, and the road surface disturbance by reducing the kingpin offset.

本発明は従来技術の有するこのような問題点に鑑み、アウタロータ式インホイールモータの軸受を小型且つ軽量に構成し、これを搭載した車両の悪路における乗り心地を改善し、車両の走行性を向上させることを課題とする。   In view of the above-described problems of the prior art, the present invention has a smaller and lighter bearing for the outer rotor type in-wheel motor, improves the riding comfort on the rough road of the vehicle on which the bearing is mounted, and improves the running performance of the vehicle. The problem is to improve.

前記課題を解決するため本発明は、電気自動車に装備されるアウタロータ式インホイールモータの軸受構造において、固定子部の内径部に複列アンギュラ玉軸受を配置し、この複列アンギュラ玉軸受を介してアウタロータ部の車軸を支持した構成を有することを特徴とする。   In order to solve the above problems, the present invention provides a bearing structure for an outer rotor type in-wheel motor equipped in an electric vehicle, wherein a double-row angular contact ball bearing is disposed on the inner diameter portion of the stator portion, and the double-row angular contact ball bearing is interposed therebetween. And having a configuration in which the axle of the outer rotor portion is supported.

また、前記構成の軸受構造において、固定子部の内径部に軸受箱を一体に設け、この軸受箱の内部に複列アンギュラ玉軸受とアウタロータ部の回転角を検出する回転センサとを軸方向に直列に配置した構成を有することを特徴とする。   Further, in the bearing structure having the above-described configuration, a bearing housing is integrally provided on the inner diameter portion of the stator portion, and a double-row angular contact ball bearing and a rotation sensor for detecting the rotation angle of the outer rotor portion are axially provided inside the bearing housing. It has the structure arrange | positioned in series, It is characterized by the above-mentioned.

本発明の軸受構造によれば、回転抵抗の小さい複列アンギュラ玉軸受をモータ軸受に配置してアウタロータ部が固定子部内に回転自在に支持されるように設けてあるので、モータ反力とタイヤ反力の双方の荷重を複列アンギュラ玉軸受で受けて支持することができ、従来のものよりもモータ軸受を小型且つ軽量に構成することが可能である。本発明の軸受構造を搭載した車両では、ばね下重量が軽減されるので、悪路における乗り心地を改善し、車室内居住性を向上させることができる。
また、固定子部の内径部に一体に設けた軸受箱内に前記複列アンギュラ玉軸受と回転センサとを軸方向に並べてコンパクトに収納して設置することができ、また、この軸受箱は固定子部内に納まる大きさに設定することができるので、これを搭載した車両では懸架装置におけるキングピンオフセットの軽減が図られ、車両の直進性を向上させて良好な走行性及び操舵性を得ることができる。 According to the bearing structure of the present invention, the double row angular contact ball bearing having a small rotational resistance is disposed on the motor bearing so that the outer rotor portion is rotatably supported in the stator portion. Both loads of the reaction force can be received and supported by the double-row angular contact ball bearing, and the motor bearing can be made smaller and lighter than the conventional one. In the vehicle equipped with the bearing structure of the present invention, the unsprung weight is reduced, so that the riding comfort on rough roads can be improved and the comfort in the passenger compartment can be improved.
In addition, the double row angular contact ball bearings and the rotation sensor can be stored in a compact arrangement in a bearing box provided integrally with the inner diameter part of the stator part, and the bearing box is fixed. Since it can be set to a size that can be accommodated in the child part, in a vehicle equipped with this, the kingpin offset in the suspension device can be reduced, and the straightness of the vehicle can be improved to obtain good traveling performance and steering performance. it can.

本発明を適用した一実施形態のアウタロータ式インホイールモータの概略断面図である。It is a schematic sectional drawing of the outer rotor type in-wheel motor of one embodiment to which the present invention is applied. 本発明で用いる複列アンギュラ玉軸受の一例の断面図である。It is sectional drawing of an example of the double row angular contact ball bearing used by this invention. 従来の車輪軸受装置の断面図である。It is sectional drawing of the conventional wheel bearing apparatus.

本発明の好適な一実施形態を、図面を参照して説明する。
図１は本発明のモータ軸受構造を適用したアウタロータ式インホイールモータ（以下、「モータ」という）の概略断面を示しており、このモータ１は、図示されない懸架装置を介して車体に取付けられる固定子部１１の内径部に、複列アンギュラ玉軸受２を配置し、この複列アンギュラ玉軸受２を介してアウタロータ部１２の車軸１２ａを連結して、固定子部１１の外周側に配設されたアウタロータ部１２を回転自在に支持して構成されている。 A preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic cross section of an outer rotor type in-wheel motor (hereinafter referred to as “motor”) to which the motor bearing structure of the present invention is applied. The motor 1 is fixed to a vehicle body via a suspension device (not shown). A double-row angular contact ball bearing 2 is arranged on the inner diameter portion of the child portion 11, and the axle 12 a of the outer rotor portion 12 is connected via the double-row angular ball bearing 2 to be arranged on the outer peripheral side of the stator portion 11. The outer rotor portion 12 is rotatably supported.

より詳しくは、固定子部１１内には周方向に多数のコイル１１ａが列設して巻かれ、アウタロータ部１２には同じく周方向に多数のマグネット１２ｂが列設されており、これらコイル１１ａの外周面とマグネット１２ｂの内周面とは僅かな間隙を挟んで対向させてある。なお、図示されない車輪のホイールは、アウタロータ部１２の側面に設けたロータヨーク１２ｃに締結される。   More specifically, a large number of coils 11a are arranged in a row in the circumferential direction in the stator portion 11, and a large number of magnets 12b are arranged in the circumferential direction in the outer rotor portion 12 as well. The outer peripheral surface and the inner peripheral surface of the magnet 12b are opposed to each other with a slight gap therebetween. A wheel of a wheel (not shown) is fastened to a rotor yoke 12 c provided on the side surface of the outer rotor portion 12.

固定子部１１の内径部には、リング状の軸受箱３が当該内径部内周面に一体に取付けられており、この軸受箱３内に前記複列アンギュラ玉軸受２を収納してある。ここで複列アンギュラ玉軸受２は、例えば図２に示されるように、外輪２１と内輪２２の間に複数個の転動体である玉２３、２３を所定の間隔を開けて二列に並置し、それぞれの列の玉２３、２３が接触しないように保持器２４によって一定の間隔に保持した構成のものを用いることができる。   A ring-shaped bearing box 3 is integrally attached to the inner peripheral surface of the inner diameter portion of the inner diameter portion of the stator portion 11, and the double row angular ball bearing 2 is accommodated in the bearing box 3. Here, for example, as shown in FIG. 2, the double row angular ball bearing 2 has a plurality of rolling elements balls 23, 23 arranged in parallel in two rows between an outer ring 21 and an inner ring 22. In addition, a configuration in which the balls 23, 23 in the respective rows are held at a constant interval by the holder 24 so that they do not come into contact with each other can be used.

また、前記軸受箱３内には、複列アンギュラ玉軸受２とともに回転センサ４が軸方向に直列に配置されており、当該回転センサ４でアウタロータ部１２の回転角を検出し、図示されないモータコントローラへと信号出力するように設けてある。   A rotation sensor 4 is arranged in series in the axial direction together with the double-row angular ball bearing 2 in the bearing box 3, and the rotation sensor 4 detects the rotation angle of the outer rotor portion 12, and a motor controller (not shown). It is provided to output a signal.

このように構成されたモータ１は、図示されない懸架装置で固定子部１１を支持し、アウタロータ部１２にホイールを締結して車体に取付けるとともに、車体に設置されるバッテリ、モータコントローラ、インバータなどの回路装置と電気的に接続される。そして、前記回路装置によりモータ１を作動させ、前記軸受箱３内に設置された角度センサ４でアウタロータ部１２の回転角を検出し、この角度センサ４からモータコントローラへと回転情報を出力し、受信した回転情報に応じてインバータから固定子部１１の各コイル１１ａに必要電力を供給して、駆動輪が目標回転数及び駆動トルクとなるようにモータ１が制御される。   The motor 1 configured as described above supports the stator portion 11 by a suspension device (not shown), fastens the wheel to the outer rotor portion 12 and attaches it to the vehicle body, and also includes a battery, a motor controller, an inverter, and the like installed on the vehicle body. Electrically connected to the circuit device. Then, the motor 1 is operated by the circuit device, the rotation angle of the outer rotor portion 12 is detected by the angle sensor 4 installed in the bearing housing 3, and rotation information is output from the angle sensor 4 to the motor controller. The necessary power is supplied from the inverter to each coil 11a of the stator unit 11 in accordance with the received rotation information, and the motor 1 is controlled so that the drive wheels have the target rotation speed and drive torque.

本形態のモータ１によれば、モータ軸受として回転抵抗の小さい複列アンギュラ玉軸受２を用いているので、モータ反力とタイヤ反力の双方の荷重を受けて支持することができ、モータ軸受は、軸方向の幅の狭い小型且つ軽量なものに構成することが可能である。モータ軸受が小型化されるので、懸架装置におけるキングピンオフセットを小さくすることができ、車両の走行性及び操舵性を良好なものにすることが可能である。   According to the motor 1 of the present embodiment, since the double-row angular ball bearing 2 having a low rotational resistance is used as the motor bearing, the motor bearing can be supported by receiving loads of both the motor reaction force and the tire reaction force. Can be configured to be small and lightweight with a narrow axial width. Since the motor bearing is reduced in size, the kingpin offset in the suspension device can be reduced, and the running performance and steering performance of the vehicle can be improved.

なお、図示したモータ１は本発明を適用した形態の一例を示すものであり、本発明のモータ軸受構造は図示した形態に限定されない。   The illustrated motor 1 shows an example of a form to which the present invention is applied, and the motor bearing structure of the present invention is not limited to the illustrated form.

１ モータ、１１ 固定子部、１１ａ コイル、１２ アウタロータ部、１２ａ 車軸、１２ｂ マグネット、１２ｃ ロータヨーク、２ 複列アングギュラ玉軸受、３ 軸受箱、４ 回転センサ


DESCRIPTION OF SYMBOLS 1 Motor, 11 Stator part, 11a Coil, 12 Outer rotor part, 12a Axle, 12b Magnet, 12c Rotor yoke, 2 Double row angular contact ball bearing, 3 Bearing box, 4 Rotation sensor


Claims (2)

電気自動車に装備されるアウタロータ式インホイールモータの軸受構造において、固定子部の内径部に複列アンギュラ玉軸受を配置し、この複列アンギュラ玉軸受を介してアウタロータ部の車軸を支持した構成を有することを特徴とするアウタロータ式インホイールモータの軸受構造。   In the outer rotor type in-wheel motor bearing structure equipped in the electric vehicle, a configuration in which a double-row angular contact ball bearing is disposed on the inner diameter portion of the stator portion and the axle of the outer rotor portion is supported via the double-row angular contact ball bearing. An outer rotor type in-wheel motor bearing structure comprising: 固定子部の内径部に軸受箱を一体に設け、この軸受箱の内部に複列アンギュラ玉軸受とアウタロータ部の回転角を検出する回転センサとを軸方向に直列に配置した構成を有することを特徴とする請求項１に記載のアウタロータ式インホイールモータの軸受構造。




A bearing box is integrally provided in the inner diameter part of the stator part, and a double row angular contact ball bearing and a rotation sensor for detecting the rotation angle of the outer rotor part are arranged in series in the axial direction inside the bearing box. The outer rotor type in-wheel motor bearing structure according to claim 1, wherein the outer rotor type in-wheel motor has a bearing structure.




JP2011070790A 2011-03-28 2011-03-28 Bearing structure of outer rotor type in-wheel motor Pending JP2012202547A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7498340B2 (en) 2019-05-31 2024-06-11 ミネベアミツミ株式会社 motor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004081581A (en) * 2002-08-27 2004-03-18 Abilit Corp Game machine
JP2008307917A (en) * 2007-06-12 2008-12-25 Mitsuba Corp Wheel drive device for vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004081581A (en) * 2002-08-27 2004-03-18 Abilit Corp Game machine
JP2008307917A (en) * 2007-06-12 2008-12-25 Mitsuba Corp Wheel drive device for vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7498340B2 (en) 2019-05-31 2024-06-11 ミネベアミツミ株式会社 motor

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