JP2021150974A - Motor assembly - Google Patents

Motor assembly Download PDF

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Publication number
JP2021150974A
JP2021150974A JP2020045209A JP2020045209A JP2021150974A JP 2021150974 A JP2021150974 A JP 2021150974A JP 2020045209 A JP2020045209 A JP 2020045209A JP 2020045209 A JP2020045209 A JP 2020045209A JP 2021150974 A JP2021150974 A JP 2021150974A
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Prior art keywords
motor
housing
drive shaft
conductive
inverter
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JP2020045209A
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JP6901018B1 (en
Inventor
貴彦 大石
Takahiko Oishi
貴彦 大石
好晴 内藤
Yoshiharu Naito
好晴 内藤
洋平 ▲高▼橋
洋平 ▲高▼橋
Yohei Takahashi
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Priority to JP2020045209A priority Critical patent/JP6901018B1/en
Priority to PCT/JP2021/008503 priority patent/WO2021187143A1/en
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Publication of JP6901018B1 publication Critical patent/JP6901018B1/en
Publication of JP2021150974A publication Critical patent/JP2021150974A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • 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

Abstract

To provide a motor assembly which enables the layout of a ground component in a vehicle body to be set easily and can inhibit radio noise efficiently.SOLUTION: A motor assembly for an electric vehicle includes: a motor; an inverter which controls the motor; a speed reducer which is connected to a rotary shaft of the motor and transmits power of the motor to one side of a drive shaft; and a housing which houses the motor, the inverter, and the speed reducer therein. The housing has a support part which rotatably supports the other side of the drive shaft at the outer side of the housing and electrically connects the drive shaft with a vehicle body.SELECTED DRAWING: Figure 2

Description

本発明は、電動車両用のモータ組立体に関する。 The present invention relates to a motor assembly for an electric vehicle.

近年、環境負荷低減の観点から、ＥＶ，ＨＥＶ，ＰＨＥＶ，ＦＣＶ等のように動力源としてモータを搭載した電動車両の開発や普及が進んでいる。
この種の電動車両に関しては、モータを制御するインバータを発生源とする高周波ノイズ（ラジオノイズ）がモータの駆動系をアンテナとして外部へ放射され、これによりラジオの受信等に悪影響を及ぼすことが知られている。上記のラジオノイズの対策として、モータからの動力を受ける減速機内の動力伝達経路上に、車体に対して電気的に接続された摺接ブラシを設ける構成が提案されている。 In recent years, from the viewpoint of reducing the environmental load, electric vehicles equipped with a motor as a power source, such as EVs, HEVs, PHEVs, and FCVs, have been developed and popularized.
Regarding this type of electric vehicle, it is known that high-frequency noise (radio noise) generated by the inverter that controls the motor is radiated to the outside using the drive system of the motor as an antenna, which adversely affects radio reception and the like. Has been done. As a countermeasure against the above radio noise, a configuration has been proposed in which a sliding contact brush electrically connected to the vehicle body is provided on the power transmission path in the speed reducer that receives power from the motor.

特開２０１４−１４７２９３号公報Japanese Unexamined Patent Publication No. 2014-147293

減速機に摺接ブラシを設けて接地する構成では、摺接ブラシの導電性を確保するために、減速機の潤滑油から摺接ブラシをシールすることが求められる。また、ラジオノイズを効率的に低減させるためには、車体と接地する位置をノイズの発生源であるインバータからできるだけ遠い位置とすることが好ましい。 In a configuration in which a sliding contact brush is provided on the speed reducer and grounded, it is required to seal the sliding contact brush from the lubricating oil of the speed reducer in order to ensure the conductivity of the sliding contact brush. Further, in order to efficiently reduce radio noise, it is preferable that the position where the vehicle is in contact with the vehicle body is as far as possible from the inverter which is the source of noise.

本発明は、上記の状況に鑑みてなされたものであって、車体への接地部品のレイアウトが容易で、ラジオノイズを効率的に抑制できるモータ組立体を提供する。 The present invention has been made in view of the above circumstances, and provides a motor assembly capable of easily laying out grounding parts on a vehicle body and efficiently suppressing radio noise.

本発明の一態様である電動車両用のモータ組立体は、モータと、モータを制御するインバータと、モータの回転軸に接続され、モータの動力を駆動軸の一方側に伝達する減速機と、モータ、インバータおよび減速機を内部に収容する筐体と、を備える。筐体は、駆動軸の他方側を筐体外側で回転可能に支持するとともに駆動軸を車体と電気的に接続させる支持部を有する。 The motor assembly for an electric vehicle, which is one aspect of the present invention, includes a motor, an inverter that controls the motor, a speed reducer that is connected to the rotation shaft of the motor and transmits the power of the motor to one side of the drive shaft. It includes a housing that houses a motor, an inverter, and a speed reducer inside. The housing has a support portion that rotatably supports the other side of the drive shaft on the outside of the housing and electrically connects the drive shaft to the vehicle body.

上記のモータ組立体において、支持部は、駆動軸を車体と電気的に接続させる導電性ベアリングを有してもよい。
また、上記の導電性ベアリングは、内輪と外輪の間に配置された導電性のシール部材を有していてもよい。
また、上記の導電性ベアリングは、導電性のグリスがベアリング内に封入されていてもよい。
上記のモータ組立体において、筐体は導電性を有してもよく、導電性ベアリングは、筐体と電気的に接続されてもよい。 In the above motor assembly, the support may have conductive bearings that electrically connect the drive shaft to the vehicle body.
Further, the above-mentioned conductive bearing may have a conductive sealing member arranged between the inner ring and the outer ring.
Further, in the above-mentioned conductive bearing, conductive grease may be sealed in the bearing.
In the above motor assembly, the housing may be conductive and the conductive bearings may be electrically connected to the housing.

上記のモータ組立体において、インバータは、モータの回転軸の反負荷側に配置されてもよく、減速機は、モータの回転軸の負荷側に接続されてもよい。また、支持部は、駆動軸の軸方向において、筐体のインバータが収容される部位に配置されていてもよい。 In the above motor assembly, the inverter may be arranged on the opposite load side of the rotating shaft of the motor, and the speed reducer may be connected to the load side of the rotating shaft of the motor. Further, the support portion may be arranged at a portion where the inverter of the housing is housed in the axial direction of the drive shaft.

本発明の一態様のモータ組立体によれば、車体への接地部品のレイアウトが容易になるとともに、ラジオノイズを効率的に抑制できる。 According to the motor assembly of one aspect of the present invention, the layout of the grounding component on the vehicle body can be facilitated, and radio noise can be efficiently suppressed.

本実施形態のモータ組立体の一例を示す斜視図である。It is a perspective view which shows an example of the motor assembly of this embodiment. 図１のモータ組立体の内部構造を模式的に示す図である。It is a figure which shows typically the internal structure of the motor assembly of FIG. 筐体の支持部の構成を示す拡大図である。It is an enlarged view which shows the structure of the support part of a housing.

以下、本発明の実施形態について図面を参照して説明する。
実施形態では説明を分かり易くするため、本発明の主要部以外の構造や要素については、簡略化または省略して説明する。また、図面において、同じ要素には同じ符号を付す。なお、図面に示す各要素の形状、寸法などは模式的に示したもので、実際の形状、寸法などを示すものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the embodiment, in order to make the description easy to understand, the structures and elements other than the main part of the present invention will be described in a simplified or omitted manner. Further, in the drawings, the same elements are designated by the same reference numerals. It should be noted that the shapes, dimensions, etc. of each element shown in the drawings are schematically shown, and do not indicate the actual shapes, dimensions, etc.

図１は、本実施形態の電動車両用のモータ組立体１の一例を示す斜視図である。図２は、図１のモータ組立体１の内部構造を模式的に示す図である。図面において、モータの回転軸の延長方向（軸方向Ａｘ）を矢印で示す。 FIG. 1 is a perspective view showing an example of a motor assembly 1 for an electric vehicle according to the present embodiment. FIG. 2 is a diagram schematically showing an internal structure of the motor assembly 1 of FIG. In the drawings, the extension direction (axial direction Ax) of the rotation axis of the motor is indicated by an arrow.

図２に示すように、モータ組立体１は、モータ２と、インバータ３と、減速機４と、筐体５と、駆動シャフト６とを備えている。モータ２、インバータ３および減速機４は、いずれも筐体５の内部に収容されている。なお、駆動シャフト６は駆動軸の一例である。 As shown in FIG. 2, the motor assembly 1 includes a motor 2, an inverter 3, a speed reducer 4, a housing 5, and a drive shaft 6. The motor 2, the inverter 3, and the speed reducer 4 are all housed inside the housing 5. The drive shaft 6 is an example of a drive shaft.

モータ２は、コイル（不図示）が巻回されたステータ７と、永久磁石（不図示）が配置されたロータ８と、回転軸に沿ってロータ８の鉄心に嵌入されたモータシャフト９と、を備える。本実施形態のモータ２はインナーロータ型のモータであって、ロータ８の外周には僅かなエアギャップを隔ててステータ７が配置される。モータ２においては、コイルの電流制御によりステータ７の磁界を順番に切り替えることで、ロータ８の磁界との吸引力または反発力により、モータシャフト９を中心としてロータ８が回転する。また、モータシャフト９は、負荷側および反負荷側に配置された軸受１０ａ、１０ｂにより回転自在に支持されている。 The motor 2 includes a stator 7 in which a coil (not shown) is wound, a rotor 8 in which a permanent magnet (not shown) is arranged, and a motor shaft 9 fitted in an iron core of the rotor 8 along a rotation axis. To be equipped. The motor 2 of the present embodiment is an inner rotor type motor, and the stator 7 is arranged on the outer periphery of the rotor 8 with a slight air gap. In the motor 2, the magnetic field of the stator 7 is sequentially switched by controlling the current of the coil, so that the rotor 8 rotates about the motor shaft 9 by the attractive force or the repulsive force with the magnetic field of the rotor 8. Further, the motor shaft 9 is rotatably supported by bearings 10a and 10b arranged on the load side and the non-load side.

インバータ３は、モータ２を制御するためのコントローラであって、モータシャフト９の反負荷側に配置されている。インバータ３は、例えば、高速スイッチング素子（ＩＧＢＴなど）、ゲート基板、コンデンサ、放電抵抗および制御基板などの要素を含む。インバータ３は、力行時にはバッテリ（不図示）からの直流電圧を交流に変換してモータ２のコイルに供給し、回生時にはモータ２からの交流をバッテリへの直流に変換する機能を担う。 The inverter 3 is a controller for controlling the motor 2 and is arranged on the opposite load side of the motor shaft 9. The inverter 3 includes elements such as a high-speed switching element (such as an IGBT), a gate substrate, a capacitor, a discharge resistor, and a control substrate. The inverter 3 has a function of converting a DC voltage from a battery (not shown) into an alternating current and supplying it to the coil of the motor 2 at the time of power running, and converting an alternating current from the motor 2 into a direct current to the battery at the time of regeneration.

減速機４は、モータシャフト９の負荷側に接続され、モータ２の動力を駆動シャフト６の一方側に伝達する動力伝達機構である。 The speed reducer 4 is a power transmission mechanism that is connected to the load side of the motor shaft 9 and transmits the power of the motor 2 to one side of the drive shaft 6.

減速機４は、例えば、インプットシャフト４ａ（モータシャフト）、カウンターシャフト４ｂ、アウトプットシャフト４ｃ（駆動シャフト）、インプットギヤ４ｄ、第１カウンターギヤ４ｅ、第２カウンターギヤ４ｆ、ドライブギヤ４ｇおよびデファレンシャルギヤ４ｈを有する。インプットシャフト４ａにはインプットギヤ４ｄが設けられる。カウンターシャフト４ｂには、第１カウンターギヤ４ｅおよび第２カウンターギヤ４ｆが設けられる。アウトプットシャフト４ｃには、ドライブギヤ４ｇおよびデファレンシャルギヤ４ｈが設けられる。 The speed reducer 4 includes, for example, an input shaft 4a (motor shaft), a counter shaft 4b, an output shaft 4c (drive shaft), an input gear 4d, a first counter gear 4e, a second counter gear 4f, a drive gear 4g, and a differential gear 4h. Has. The input shaft 4a is provided with an input gear 4d. The counter shaft 4b is provided with a first counter gear 4e and a second counter gear 4f. The output shaft 4c is provided with a drive gear 4g and a differential gear 4h.

モータシャフト９であるインプットシャフト４ａは、モータ２の動力によって回転する。インプットシャフト４ａのインプットギヤ４ｄは、カウンターシャフト４ｂの第１カウンターギヤ４ｅと噛み合う。また、カウンターシャフト４ｂの第２カウンターギヤ４ｆは、アウトプットシャフト４ｃのドライブギヤ４ｇと噛み合う。第１カウンターギヤ４ｅの駆動力は、カウンターシャフト４ｂの第２カウンターギヤ４ｆとアウトプットシャフト４ｃのドライブギヤ４ｇの組み合わせにより減速（加速）されて、駆動シャフト６であるアウトプットシャフト４ｃから出力される。 The input shaft 4a, which is the motor shaft 9, is rotated by the power of the motor 2. The input gear 4d of the input shaft 4a meshes with the first counter gear 4e of the counter shaft 4b. Further, the second counter gear 4f of the counter shaft 4b meshes with the drive gear 4g of the output shaft 4c. The driving force of the first counter gear 4e is decelerated (accelerated) by the combination of the second counter gear 4f of the counter shaft 4b and the drive gear 4g of the output shaft 4c, and is output from the output shaft 4c which is the drive shaft 6.

図１に示すように、駆動シャフト６は、モータ２の軸方向Ａｘと平行な方向に延びるハーフシャフトである。駆動シャフト６は、一方側が減速機４に接続され、他方側には等速ジョイント１１を介して駆動輪（不図示）が取り付けられる。この駆動シャフト６は、筐体５に設けられた後述の支持部２０によってその他方側が回転可能に支持されている。 As shown in FIG. 1, the drive shaft 6 is a half shaft extending in a direction parallel to the axial direction Ax of the motor 2. One side of the drive shaft 6 is connected to the speed reducer 4, and drive wheels (not shown) are attached to the other side via a constant velocity joint 11. The drive shaft 6 is rotatably supported on the other side by a support portion 20 provided on the housing 5, which will be described later.

筐体５は、モータ２を収容する第１筐体部１２と、インバータ３を収容する第２筐体部１３と、減速機４を収容する第３筐体部１４とを有する。筐体５は、第１筐体部１２、第２筐体部１３および第３筐体部１４を組み付けて一体化され、電動車両の車体（不図示）に取り付けられる。 The housing 5 has a first housing portion 12 for accommodating the motor 2, a second housing portion 13 for accommodating the inverter 3, and a third housing portion 14 for accommodating the speed reducer 4. The housing 5 is integrated by assembling the first housing portion 12, the second housing portion 13, and the third housing portion 14, and is attached to the vehicle body (not shown) of the electric vehicle.

また、第１筐体部１２、第２筐体部１３および第３筐体部１４は、例えばアルミニウム合金などの導電性を有する金属を鋳造してそれぞれ形成されており、いずれも導電性を有している。そのため、筐体５は、車体との取付部（不図示）を介して車体と電気的に接続され、車体と等しく接地電位となる。なお、必要に応じて、筐体５と車体をアース線で電気的に接続してもよい。 Further, the first housing portion 12, the second housing portion 13, and the third housing portion 14 are each formed by casting a conductive metal such as an aluminum alloy, and all of them have conductivity. doing. Therefore, the housing 5 is electrically connected to the vehicle body via a mounting portion (not shown) with the vehicle body, and has a ground potential equal to that of the vehicle body. If necessary, the housing 5 and the vehicle body may be electrically connected by a ground wire.

ここで、第２筐体部１３は、第１筐体部１２のモータ２の反負荷側（図２の右側）に配置されている。また、第３筐体部１４は、第１筐体部１２のモータ２の負荷側（図２の左側）に配置されている。そのため、第２筐体部１３および第３筐体部１４は、軸方向Ａｘにおいて第１筐体部１２を隔てて配置されている。 Here, the second housing portion 13 is arranged on the opposite load side (right side in FIG. 2) of the motor 2 of the first housing portion 12. Further, the third housing portion 14 is arranged on the load side (left side in FIG. 2) of the motor 2 of the first housing portion 12. Therefore, the second housing portion 13 and the third housing portion 14 are arranged so as to be separated from the first housing portion 12 in the axial direction Ax.

また、筐体５においてインバータ３を収容する第２筐体部１３には、駆動シャフト６の他方側を回転可能に支持する支持部２０が筐体外側に設けられている。支持部２０は、筐体５を介して駆動シャフト６を車体と電気的に接続し、駆動シャフト６を接地させる機能を担う。 Further, the second housing portion 13 that accommodates the inverter 3 in the housing 5 is provided with a support portion 20 that rotatably supports the other side of the drive shaft 6 on the outside of the housing. The support portion 20 has a function of electrically connecting the drive shaft 6 to the vehicle body via the housing 5 and grounding the drive shaft 6.

図３は、筐体５の支持部２０の構成を示す拡大図である。
第２筐体部１３の支持部２０は、導電性ベアリング２１を介して駆動シャフト６を回転可能に支持する構成である。なお、支持部２０において、導電性ベアリング２１よりも軸方向Ａｘの一方側にはダストカバー２２が配置され、導電性ベアリング２１よりも軸方向Ａｘの他方側にはシール部材２３が配置されている。 FIG. 3 is an enlarged view showing the configuration of the support portion 20 of the housing 5.
The support portion 20 of the second housing portion 13 has a configuration in which the drive shaft 6 is rotatably supported via the conductive bearing 21. In the support portion 20, the dust cover 22 is arranged on one side of the axial direction Ax from the conductive bearing 21, and the seal member 23 is arranged on the other side of the axial direction Ax from the conductive bearing 21. ..

導電性ベアリング２１は、例えば玉軸受であって、駆動シャフト６に臨む内輪２４と、第２筐体部１３に臨む外輪２５と、内輪２４と外輪２５の間に転動自在に配設された複数のボール２６とを有している。また、内輪２４と外輪２５の間には、ボール２６を隔てて軸方向の両側に、接触形のリップシール２７がそれぞれ配置されている。そして、内輪２４、外輪２５およびリップシール２７で囲まれた空間２８にはグリスが充填されている。グリスは、リップシール２７により導電性ベアリング２１の内部に封入され、内輪２４および外輪２５の軌道面とボール２６との接触面を潤滑する。 The conductive bearing 21 is, for example, a ball bearing, which is rotatably arranged between the inner ring 24 facing the drive shaft 6, the outer ring 25 facing the second housing portion 13, and the inner ring 24 and the outer ring 25. It has a plurality of balls 26. Further, between the inner ring 24 and the outer ring 25, contact-type lip seals 27 are arranged on both sides in the axial direction with the ball 26 interposed therebetween. The space 28 surrounded by the inner ring 24, the outer ring 25, and the lip seal 27 is filled with grease. The grease is sealed inside the conductive bearing 21 by the lip seal 27, and lubricates the contact surfaces between the raceway surfaces of the inner ring 24 and the outer ring 25 and the ball 26.

本実施形態において内輪２４および外輪２５は、それぞれ導電性を有する金属材で形成されている。また、リップシール２７は、例えば、導電性を有する粉末（カーボンブラックや金属粒子など）を含有した樹脂などの導電性材料で形成され、内輪２４および外輪２５と接触する。上記の構成によれば、導電性のリップシール２７を介して内輪２４と外輪２５が導電状態になるので、駆動シャフト６と第２筐体部１３を電気的に接続して駆動シャフト６を車体に接地させることができる。なお、本実施形態において導電性のリップシール２７を適用する場合、導電性を有しないが耐熱性が高い仕様のグリスを導電性ベアリング２１に適用することができる。 In the present embodiment, the inner ring 24 and the outer ring 25 are each made of a conductive metal material. Further, the lip seal 27 is formed of, for example, a conductive material such as a resin containing a conductive powder (carbon black, metal particles, etc.), and comes into contact with the inner ring 24 and the outer ring 25. According to the above configuration, the inner ring 24 and the outer ring 25 are brought into a conductive state via the conductive lip seal 27. Therefore, the drive shaft 6 and the second housing portion 13 are electrically connected to connect the drive shaft 6 to the vehicle body. Can be grounded to. When the conductive lip seal 27 is applied in the present embodiment, grease having a specification that does not have conductivity but has high heat resistance can be applied to the conductive bearing 21.

また、本実施形態において、導電性ベアリング２１内に封入されるグリスとして、例えば、導電性を有する粉末（カーボンブラックや金属粒子など）が添加された導電性グリスを適用してもよい。上記の構成によれば、導電性のグリスを介して内輪２４と外輪２５が導電状態になるので、駆動シャフト６と第２筐体部１３を電気的に接続して駆動シャフト６を車体に接地させることができる。なお、本実施形態において導電性グリスを適用する場合、リップシールは上記のように導電性のものを適用してもよく、導電性を有しないものを適用してもよい。 Further, in the present embodiment, as the grease sealed in the conductive bearing 21, for example, conductive grease to which conductive powder (carbon black, metal particles, etc.) is added may be applied. According to the above configuration, since the inner ring 24 and the outer ring 25 are brought into a conductive state via the conductive grease, the drive shaft 6 and the second housing portion 13 are electrically connected to ground the drive shaft 6 to the vehicle body. Can be made to. When the conductive grease is applied in the present embodiment, the lip seal may be a conductive one as described above, or a non-conductive one may be applied.

ここで、モータ２を少なくとも動力源の一部として備える電動車両では、インバータ３を発生源とした高周波ノイズが、モータ２の駆動系をアンテナとして外部へ放射される事象が生じうる。 Here, in an electric vehicle including the motor 2 as at least a part of the power source, an event may occur in which high-frequency noise originating from the inverter 3 is radiated to the outside using the drive system of the motor 2 as an antenna.

具体的には、スイッチング素子により電流の向きを変えるインバータ３の位相制御において、ターンオンする際に電流（電圧）の急峻な立ち上がり波形が生じる。すると、インバータ３から高周波のクリックノイズ（高周波ノイズ）が発生する。上記の高周波ノイズは、電源ケーブルとモータコイルを経てインバータ３からモータシャフト９に伝わる。そして、更にモータシャフト９から減速機４のインプットギヤ４ｄと、カウンターシャフト４ｂと、デファレンシャルギヤ４ｈと、駆動シャフト６を経て駆動輪により絶縁されたサスペンションに伝播する。上記のような高周波ノイズの伝導経路はアンテナとして機能する。その結果として、高周波ノイズが外部へ放射され、例えば、ラジオの受信等に悪影響を及ぼすなどの電波障害が発生しうる。 Specifically, in the phase control of the inverter 3 that changes the direction of the current by the switching element, a steep rising waveform of the current (voltage) is generated at the time of turning on. Then, high-frequency click noise (high-frequency noise) is generated from the inverter 3. The above-mentioned high-frequency noise is transmitted from the inverter 3 to the motor shaft 9 via the power cable and the motor coil. Then, it further propagates from the motor shaft 9 to the suspension insulated by the drive wheels via the input gear 4d of the reduction gear 4, the counter shaft 4b, the differential gear 4h, and the drive shaft 6. The high-frequency noise conduction path as described above functions as an antenna. As a result, high-frequency noise is radiated to the outside, which may cause radio interference such as adversely affecting radio reception and the like.

一方、本実施形態のモータ組立体１は、筐体外側に設けた支持部２０の導電性ベアリング２１によって、駆動シャフト６の他方側を筐体外側で回転可能に支持するとともに、筐体５を介して駆動シャフト６を車体に接地させる。これにより、駆動シャフト６が車体と接地されるのでラジオノイズが抑制される。
インバータ３で発生した高周波ノイズは、モータシャフト９、減速機４および駆動シャフト６を経て導電性ベアリング２１に到達する。そのため、本実施形態によれば、筐体５内で接地する場合と比べると接地位置よりも上流側の伝導経路による抵抗を大きくすることができ、ラジオノイズをより効率的に抑制できる。 On the other hand, in the motor assembly 1 of the present embodiment, the other side of the drive shaft 6 is rotatably supported on the outside of the housing by the conductive bearing 21 of the support portion 20 provided on the outside of the housing, and the housing 5 is supported. The drive shaft 6 is grounded to the vehicle body via the vehicle. As a result, the drive shaft 6 is grounded to the vehicle body, so that radio noise is suppressed.
The high-frequency noise generated by the inverter 3 reaches the conductive bearing 21 via the motor shaft 9, the speed reducer 4, and the drive shaft 6. Therefore, according to the present embodiment, the resistance due to the conduction path on the upstream side of the grounding position can be increased as compared with the case of grounding in the housing 5, and the radio noise can be suppressed more efficiently.

また、本実施形態では、駆動シャフト６を筐体外側で支持する支持部２０に駆動シャフト６を接地させる機能を持たせているので、減速機４を収容する第３筐体部１４の内部に、摺動ブラシなどの接地部品を潤滑油からシールして組み込まずにすむ。そのため、車体への接地部品のレイアウトが容易になる。
さらに、本実施形態では、導電性ベアリング２１で駆動シャフト６を接地させて接地部品と軸受けを兼用できるので、モータ組立体１の構成をよりコンパクトにできる。また、接地部品と軸受けの兼用により、部品点数を削減してモータ組立体１の製造コストを低減することもできる。 Further, in the present embodiment, since the support portion 20 that supports the drive shaft 6 on the outside of the housing has a function of grounding the drive shaft 6, the inside of the third housing portion 14 that accommodates the speed reducer 4 is provided. , It is not necessary to seal the grounding parts such as sliding brushes from the lubricating oil and install them. Therefore, the layout of the grounding parts on the vehicle body becomes easy.
Further, in the present embodiment, since the drive shaft 6 can be grounded by the conductive bearing 21 and can be used as both the grounding component and the bearing, the configuration of the motor assembly 1 can be made more compact. Further, by using both the grounding component and the bearing, the number of components can be reduced and the manufacturing cost of the motor assembly 1 can be reduced.

本発明は、上記実施形態に限定されることなく、本発明の趣旨を逸脱しない範囲において、種々の改良並びに設計の変更を行ってもよい。
加えて、今回開示された実施形態は、全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。 The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
In addition, the embodiments disclosed this time should be considered to be exemplary and not restrictive in all respects. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

１…モータ組立体、２…モータ、３…インバータ、４…減速機、５…筐体、６…駆動シャフト、７…ステータ、８…ロータ、９…モータシャフト、１２…第１筐体部、１３…第２筐体部、１４…第３筐体部、２０…支持部、２１…導電性ベアリング、２４…内輪、２５…外輪、２６…ボール、２７…リップシール

1 ... motor assembly, 2 ... motor, 3 ... inverter, 4 ... reducer, 5 ... housing, 6 ... drive shaft, 7 ... stator, 8 ... rotor, 9 ... motor shaft, 12 ... first housing part, 13 ... 2nd housing, 14 ... 3rd housing, 20 ... Support, 21 ... Conductive bearing, 24 ... Inner ring, 25 ... Outer ring, 26 ... Ball, 27 ... Lip seal

本発明の一態様である電動車両用のモータ組立体は、モータと、モータを制御するインバータと、モータの回転軸に接続され、モータの動力を駆動軸の一方側に伝達する減速機と、モータ、インバータおよび減速機を内部に収容する筐体と、を備える。筐体は、駆動軸を接地電位である車体と電気的に接続させるとともに、筐体の外側に露出した支持部を有する。駆動軸は、一方側が減速機に接続されて支持され、他方側が筐体の外側の位置で支持部により回転可能に支持される。
The motor assembly for an electric vehicle, which is one aspect of the present invention, includes a motor, an inverter that controls the motor, a speed reducer that is connected to the rotation shaft of the motor and transmits the power of the motor to one side of the drive shaft. It includes a housing that houses a motor, an inverter, and a speed reducer inside. Housing, a drive shaft causes connected to the vehicle body and electrically at ground potential, to have the supporting portion exposed to the outside of the housing. One side of the drive shaft is connected to and supported by the speed reducer, and the other side is rotatably supported by a support portion at a position outside the housing.

Claims (6)

電動車両用のモータ組立体であって、
モータと、
前記モータを制御するインバータと、
前記モータの回転軸に接続され、前記モータの動力を駆動軸の一方側に伝達する減速機と、
前記モータ、前記インバータおよび前記減速機を内部に収容する筐体と、を備え、
前記筐体は、前記駆動軸の他方側を筐体外側で回転可能に支持するとともに前記駆動軸を車体と電気的に接続させる支持部を有する
ことを特徴とするモータ組立体。 A motor assembly for electric vehicles
With the motor
The inverter that controls the motor and
A speed reducer connected to the rotating shaft of the motor and transmitting the power of the motor to one side of the drive shaft.
The motor, the inverter, and a housing for accommodating the speed reducer are provided.
The housing is a motor assembly characterized by having a support portion that rotatably supports the other side of the drive shaft on the outside of the housing and electrically connects the drive shaft to a vehicle body. 前記支持部は、前記駆動軸を車体と電気的に接続させる導電性ベアリングを有する
ことを特徴とする請求項１に記載のモータ組立体。 The motor assembly according to claim 1, wherein the support portion has a conductive bearing that electrically connects the drive shaft to the vehicle body. 前記導電性ベアリングは、内輪と外輪の間に配置された導電性のシール部材を有する
ことを特徴とする請求項２に記載のモータ組立体。 The motor assembly according to claim 2, wherein the conductive bearing has a conductive sealing member arranged between an inner ring and an outer ring. 前記導電性ベアリングは、導電性のグリスがベアリング内に封入されている
ことを特徴とする請求項２または請求項３に記載のモータ組立体。 The motor assembly according to claim 2 or 3, wherein the conductive bearing has conductive grease sealed in the bearing. 前記筐体は導電性を有し、
前記導電性ベアリングは、前記筐体と電気的に接続される
ことを特徴とする請求項１から請求項４のいずれか一項に記載のモータ組立体。 The housing is conductive and
The motor assembly according to any one of claims 1 to 4, wherein the conductive bearing is electrically connected to the housing. 前記インバータは、前記モータの回転軸の反負荷側に配置され、
前記減速機は、前記モータの回転軸の負荷側に接続され、
前記支持部は、前記駆動軸の軸方向において、前記筐体の前記インバータが収容される部位に配置されている
ことを特徴とする請求項１から請求項５のいずれか一項に記載のモータ組立体。

The inverter is arranged on the opposite load side of the rotating shaft of the motor.
The speed reducer is connected to the load side of the rotating shaft of the motor.
The motor according to any one of claims 1 to 5, wherein the support portion is arranged at a portion of the housing in which the inverter is housed in the axial direction of the drive shaft. Assembly.
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JP2012130217A (en) * 2010-12-17 2012-07-05 Daikin Ind Ltd Motor
JP2014147293A (en) * 2010-05-27 2014-08-14 Nissan Motor Co Ltd Power transmission device for electric vehicle

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014147293A (en) * 2010-05-27 2014-08-14 Nissan Motor Co Ltd Power transmission device for electric vehicle
JP2012130217A (en) * 2010-12-17 2012-07-05 Daikin Ind Ltd Motor

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