JP2006258289A - In-wheel motor drive unit - Google Patents

In-wheel motor drive unit Download PDF

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JP2006258289A
JP2006258289A JP2006027135A JP2006027135A JP2006258289A JP 2006258289 A JP2006258289 A JP 2006258289A JP 2006027135 A JP2006027135 A JP 2006027135A JP 2006027135 A JP2006027135 A JP 2006027135A JP 2006258289 A JP2006258289 A JP 2006258289A
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wheel
drive device
motor drive
eccentric
electric motor
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JP4799199B2 (en
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Tsuguto Nakaseki
嗣人 中関
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NTN Corp
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NTN Toyo Bearing Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B60L15/2036—Electric differentials, e.g. for supporting steering vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/40—Electrical machine applications
    • B60L2220/44—Wheel Hub motors, i.e. integrated in the wheel hub
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/423—Torque
    • 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
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact in-wheel motor drive unit capable of getting the large reduction ratio and having the strong speed reduction mechanism to the vibration and the compact arrangement construction of the speed reduction mechanism. <P>SOLUTION: The reduction gear that couples a rotating shaft 2 of an electric motor 1 with a hub 21 of a wheel is downsized and can get the big reduction gear ratio and becomes strong against the vibration by making it a cyclo-reduction gear 11 to transmit the eccentric movement of two pieces of curve plates 12a, 12b fixed to two eccentric parts 2a, 2b of the rotating shaft 2 of the electric motor 1 to the hub 21 as the rotating movement. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、電動モータの出力軸と車輪のハブとを減速機を介して同軸上に連結したインホイールモータ駆動装置に関する。   The present invention relates to an in-wheel motor drive device in which an output shaft of an electric motor and a wheel hub are coaxially connected via a reduction gear.

従来のインホイールモータ駆動装置は、例えば、特開２００５−７９１４号公報（特許文献１）に記載されている。同公報に記載されているインホイールモータ駆動装置は、駆動力を発生させるモータと、タイヤを接続するホイールハブと、モータおよびホイールハブの間に、モータの回転を減速してタイヤに伝達する減速機とを備える。この減速機は、歯数の異なる複数の歯車を組み合わせてなる平行軸歯車機構を採用している。   A conventional in-wheel motor drive device is described in, for example, Japanese Patent Application Laid-Open No. 2005-7914 (Patent Document 1). The in-wheel motor drive device described in the publication includes a motor that generates a driving force, a wheel hub that connects a tire, and a deceleration that decelerates the rotation of the motor and transmits it to the tire between the motor and the wheel hub. Equipped with a machine. This reduction gear employs a parallel shaft gear mechanism formed by combining a plurality of gears having different numbers of teeth.

このような電動モータの出力軸と車輪のハブとを減速機を介して連結したインホイールモータ駆動装置は、プロペラシャフトやデファレンシャル等の大がかりな動力伝達機構が不要となるので、車両の軽量化やコンパクト化等の面から注目されている。しかしながら、車両のばね下に取り付けられるインホイールモータ駆動装置は、ばね下重量の増加によって乗り心地が悪くなる難点があり、未だ実用化には至っていない。   Such an in-wheel motor drive device in which the output shaft of the electric motor and the wheel hub are connected via a speed reducer eliminates the need for a large-scale power transmission mechanism such as a propeller shaft and a differential, thereby reducing the weight of the vehicle. It is attracting attention in terms of compactness. However, the in-wheel motor drive device attached to the unsprung portion of the vehicle has a drawback that the ride comfort becomes worse due to the increase of the unsprung weight, and has not yet been put into practical use.

電動モータの出力トルクとモータ容積（重量）はほぼ比例関係にあり、小さなモータ容積で車両の車輪を駆動するのに足る大きな出力を得るためには、高速回転化が避けられず、電動モータの出力軸とハブとの間に減速機を組み込む必要がある。このため、組み込む減速機の重量が大きくなっては意味がないので、インホイールモータ駆動装置では、コンパクトで大きな減速比の得られる減速機構と当該減速機構のコンパクトな配置構造が求められている。   The output torque of the electric motor and the motor volume (weight) are almost proportional, and in order to obtain a large output sufficient to drive the wheels of the vehicle with a small motor volume, high-speed rotation is inevitable. It is necessary to incorporate a reduction gear between the output shaft and the hub. For this reason, since the weight of the speed reducer to be incorporated is meaningless, the in-wheel motor drive device is required to have a compact speed reduction mechanism capable of obtaining a large speed reduction ratio and a compact arrangement structure of the speed reduction mechanism.

また、電気自動車用減速装置として、電動モータの出力軸と車輪のハブとの間に減速機として遊星歯車減速機を組み込んだものがある（例えば、特許文献２参照）。特許文献２に記載されたものは、電動モータと減速機がばね下に取り付けられるインホイールモータ駆動装置ではないが、遊星歯車減速機を２段に設け、２段目の遊星歯車減速機からの出力をドライブシャフトを介してばね下の左右の車輪に分配している。
特開２００５−７９１４号公報 特開平５−３３２４０１号公報（第１−３図） In addition, as a reduction device for an electric vehicle, there is one in which a planetary gear reduction device is incorporated as a reduction device between an output shaft of an electric motor and a wheel hub (see, for example, Patent Document 2). Although what is described in Patent Document 2 is not an in-wheel motor drive device in which the electric motor and the speed reducer are mounted under the spring, the planetary gear speed reducer is provided in two stages, and the output from the second stage planetary gear speed reducer is Output is distributed to the left and right unsprung wheels via the drive shaft.
JP 2005-7914 A Japanese Patent Laid-Open No. 5-332401 (Fig. 1-3)

上記の各公報に記載された減速機に採用されている平行軸歯車機構や遊星歯車機構の減速比は、歯車の強度等の観点から前者が１／２〜１／３、後者が１／３〜１／６程度に設定されるのが一般的である。これは、インホイールモータ駆動装置に搭載する減速機の減速比としては不十分であり、十分な減速比を得るためには、減速機を多段構成とする必要がある。これは、減速機の重量およびサイズの増大を招き、コンパクト化が必要なインホイールモータ駆動装置には不適切である。   The reduction ratios of the parallel shaft gear mechanism and the planetary gear mechanism employed in the reduction gears described in the above publications are 1/2 to 1/3 for the former and 1/3 for the latter from the viewpoint of gear strength and the like. Generally, it is set to about １ ／. This is insufficient as a reduction ratio of a reduction gear mounted on the in-wheel motor drive device, and the reduction gear needs to have a multistage configuration in order to obtain a sufficient reduction ratio. This leads to an increase in the weight and size of the speed reducer, and is inappropriate for an in-wheel motor drive device that needs to be made compact.

また、特許文献２に記載された遊星歯車減速機は平行軸歯車と比較すると大きな減速比を得ることができるが、遊星歯車減速機はサンギヤ、リングギヤ、ピニオンギヤおよびピニオンギヤのキャリヤとで構成されるので、部品点数が多くコンパクト化が難しい問題がある。   Further, the planetary gear reducer described in Patent Document 2 can obtain a large reduction ratio as compared with the parallel shaft gear. There is a problem that the number of parts is large and it is difficult to make it compact.

そこで、本発明の課題は、コンパクトで大きな減速比が得られる減速機構と当該減速機構のコンパクトな配置構造を有するインホイールモータ駆動装置を提供することである。   SUMMARY OF THE INVENTION An object of the present invention is to provide an in-wheel motor drive device having a compact reduction mechanism that can obtain a large reduction ratio and a compact arrangement structure of the reduction mechanism.

上記の課題を解決するために、本発明に係るインホイールモータ駆動装置は、電動モータと車両の車輪軸受との間に減速機構を介在したインホイールモータ駆動装置であって、電動モータの出力部にサイクロイド減速機構の偏心部を形成し、偏心部に曲線板を装着し、曲線板の偏心運動を車輪軸受へ回転運動として伝達する構成とした。   In order to solve the above-described problems, an in-wheel motor drive device according to the present invention is an in-wheel motor drive device in which a reduction mechanism is interposed between an electric motor and a wheel bearing of a vehicle, and an output portion of the electric motor. The eccentric part of the cycloid reduction mechanism is formed on the curved part, and a curved plate is attached to the eccentric part, and the eccentric movement of the curved plate is transmitted to the wheel bearing as a rotational movement.

すなわち、減速機を、電動モータの出力軸の偏心部に装着した曲線板の偏心運動を回転運動としてハブに伝達するサイクロ減速機とすることにより、コンパクトで大きな減速比が得られる減速機構と当該減速機構のコンパクトな配置構造を有するインホイールモータ駆動装置を提供できるようにした。   That is, the speed reducer is a cyclo speed reducer that transmits the eccentric motion of the curved plate attached to the eccentric portion of the output shaft of the electric motor to the hub as a rotational motion, and the speed reduction mechanism capable of obtaining a compact and large reduction ratio and An in-wheel motor drive device having a compact arrangement structure of the speed reduction mechanism can be provided.

前記サイクロ減速機は、外形がなだらかな波状のトロコイド系曲線で形成された曲線板の偏心運動を、その外周に同心円上に固定した複数の外ピンで案内するとともに、回転運動を伝達される出力部材に同心円上に取り付けた複数の内ピンを、曲線板の内部に同心円上に設けた複数の貫通孔に嵌挿係合して、この内ピンと貫通孔の係合によって曲線板の偏心運動を出力部材に回転運動として伝達するものであり、部品点数が少なくコンパクトに設計でき、１段で１／１０以上の大きな減速比を得ることができる。   The cyclo reducer guides the eccentric motion of a curved plate formed of a wavy trochoidal curve with a gentle outer shape with a plurality of outer pins fixed concentrically on the outer periphery thereof, and outputs the rotational motion transmitted A plurality of inner pins attached concentrically to the member are fitted into and engaged with a plurality of through holes provided concentrically inside the curved plate, and the eccentric movement of the curved plate is caused by the engagement of the inner pins and the through holes. It is transmitted to the output member as a rotational motion, can be designed compactly with a small number of parts, and a large reduction ratio of 1/10 or more can be obtained in one stage.

前記曲線板を複数枚装着し、これらの複数枚の曲線板を、互いに偏心運動を打ち消す位相で装着することにより、曲線板の偏心運動に伴う振動を抑制することができる。   By mounting a plurality of the curved plates and mounting the plurality of curved plates at a phase that cancels the eccentric motion, vibrations associated with the eccentric motion of the curved plates can be suppressed.

前記電動モータの出力軸に、前記曲線板の偏心運動を打ち消す位相でカウンタウェイトを装着することにより、曲線板の偏心運動に伴う重心まわりの振動を抑制することができる。   By mounting a counterweight on the output shaft of the electric motor at a phase that cancels the eccentric motion of the curved plate, vibration around the center of gravity due to the eccentric motion of the curved plate can be suppressed.

前記サイクロ減速機の曲線板の外周を案内する複数の外ピンと、前記曲線板の内部に設けた複数の貫通孔に嵌挿係合される複数の内ピンとに軸受を嵌着し、これらの軸受の外輪を、それぞれ前記曲線板の外周と前記各貫通孔の内周とに転接させることにより、外ピンと曲線板の外周との接触抵抗、および内ピンと貫通孔の内周との接触抵抗を低減し、曲線板の偏心運動を回転運動としてスムーズにハブに伝達することができる。   The bearings are fitted to a plurality of outer pins that guide the outer periphery of the curved plate of the cyclo reducer and a plurality of inner pins that are fitted and engaged with a plurality of through holes provided in the curved plate. Of the outer ring and the inner periphery of each of the through-holes, respectively, so that the contact resistance between the outer pin and the outer periphery of the curved plate and the contact resistance between the inner pin and the inner periphery of the through-hole are reduced. The eccentric motion of the curved plate can be smoothly transmitted to the hub as a rotational motion.

上述したインホイールモータ駆動装置は、電気自動車に好適である。   The above-described in-wheel motor drive device is suitable for an electric vehicle.

この発明に係るインホイールモータ駆動装置は、電動モータ側回転部材を回転駆動するモータ部と、電動モータ側回転部材の回転を減速して車輪側回転部材に伝達する減速部と、車輪側回転部材に固定連結された車輪ハブとを備え、電動モータ側回転部材は偏心部を有する。そして、減速部は、偏心部に回転自在に保持されて、電動モータ側回転部材の回転に伴ってその回転軸心を中心とする公転運動を行う公転部材と、公転部材の外周部に係合して公転部材の自転運動を生じさせる外周係合部材と、公転部材の自転運動を、電動モータ側回転部材の回転軸心を中心とする回転運動に変換して車輪側回転部材に伝達する運動変換機構とを含む。また、具体的には、公転部材はその外周部に複数の波形を有し、外周係合部材は、公転部材の公転軌道上に配置された複数の外ピンを有するのが好ましい。   An in-wheel motor drive device according to the present invention includes a motor unit that rotationally drives an electric motor side rotation member, a speed reduction unit that decelerates the rotation of the electric motor side rotation member and transmits the rotation to the wheel side rotation member, and a wheel side rotation member A wheel hub fixedly connected to the electric motor, and the electric motor side rotating member has an eccentric portion. The speed reduction portion is rotatably held by the eccentric portion, and engages with a revolution member that performs a revolving motion around the rotation axis as the electric motor side rotation member rotates, and an outer peripheral portion of the revolution member. The outer peripheral engagement member that causes the rotation of the revolving member and the rotation of the revolving member that is converted into a rotation about the rotation axis of the electric motor side rotation member and transmitted to the wheel side rotation member Conversion mechanism. Specifically, it is preferable that the revolution member has a plurality of corrugations on its outer peripheral portion, and the outer periphery engagement member has a plurality of outer pins arranged on the revolution track of the revolution member.

上記構成を有する減速部は、コンパクトで高減速比が得られるので、モータ部を小型、軽量化することができる。その結果、軽量で、駆動輪に十分なトルクを供給することができるインホイールモータ駆動装置を得ることができる。   Since the speed reduction part which has the said structure is compact and a high reduction ratio is obtained, a motor part can be reduced in size and weight. As a result, it is possible to obtain an in-wheel motor drive device that is lightweight and can supply sufficient torque to the drive wheels.

好ましくは、外ピンは公転部材の外周部に当接する転がり軸受を含む。これにより、公転部材と外ピンとの接触抵抗を低減することができるので、減速部での伝達効率が向上する。   Preferably, the outer pin includes a rolling bearing that abuts on the outer peripheral portion of the revolution member. Thereby, since the contact resistance of a revolution member and an outer pin can be reduced, the transmission efficiency in a deceleration part improves.

好ましくは、電動モータ側回転部材の偏心部は、偏心運動による遠心力を互いに打消し合う位相で配置された第１偏心部と、第２偏心部とを含み、公転部材は、第１偏心部に回転自在に保持された第１公転部材と、第１公転部材と同じ外周形状を有して第２偏心部に回転自在に保持された第２公転部材とを含む。   Preferably, the eccentric part of the electric motor side rotating member includes a first eccentric part and a second eccentric part arranged in a phase where the centrifugal forces due to the eccentric motion cancel each other, and the revolution member is the first eccentric part. And a second revolving member having the same outer peripheral shape as that of the first revolving member and rotatably held by the second eccentric portion.

偏心部は、回転時に偏った遠心力を発生させる。そこで、例えば、第１偏心部と第２偏心部とを１８０°位相を変えて配置することにより、第１公転部材と第２公転部材とが互いの遠心力を打ち消しあうので、インホイールモータ駆動装置の振動を抑制することができる。   The eccentric part generates an eccentric centrifugal force during rotation. Therefore, for example, by arranging the first eccentric part and the second eccentric part with a phase difference of 180 °, the first revolving member and the second revolving member cancel each other's centrifugal force. The vibration of the apparatus can be suppressed.

好ましくは、公転部材の偏心運動による慣性モーメントを打消す位相で電動モータ側回転部材に装着したカウンタウェイトをさらに備える。偏心部は、偏った遠心力と共に慣性モーメントを発生させる。そこで、公転部材の慣性モーメントを打ち消す位相でカウンタウェイトを配置することにより、インホイールモータ駆動装置の振動を抑制することができる。   Preferably, a counterweight attached to the electric motor side rotating member at a phase that cancels out the moment of inertia due to the eccentric motion of the revolving member is further provided. The eccentric portion generates a moment of inertia together with the eccentric centrifugal force. Therefore, the vibration of the in-wheel motor drive device can be suppressed by arranging the counterweight at a phase that cancels the moment of inertia of the revolving member.

運動変換機構は、例えば、公転部材と車輪側回転部材のうちの一方に設けられた内ピンと、公転部材と車輪側回転部材のうちの他方に形成され、うちピンの外径より所定部だけ径が大きい内ピンを受入れる穴とを有する。例えば、穴は公転部材に設けられ、内ピンは車輪側回転部材に保持されている。上記構成の運動変換機構とすることにより、公転部材の自転運動を車輪側回転部材に伝達することができる。   The motion conversion mechanism is formed, for example, on an inner pin provided on one of the revolving member and the wheel side rotating member and on the other of the revolving member and the wheel side rotating member, of which the diameter is a predetermined portion from the outer diameter of the pin. Has a hole for receiving a large inner pin. For example, the hole is provided in the revolving member, and the inner pin is held by the wheel side rotating member. By setting it as the motion conversion mechanism of the said structure, the rotation motion of a revolution member can be transmitted to a wheel side rotation member.

好ましくは、穴は公転部材の自転軸心を中心とする円周軌道上に複数個設けられ、内ピンは、車輪側回転部材の回転軸心を中心とする円周軌道上に複数個設けられている。この減速部は、作動原理の観点からは１個の穴と１個の内ピンとで構成することが可能である。しかし、穴の壁面と内ピンとは、接触状態と非接触状態とを繰り返しながら回転するので、複数の穴と複数の内ピンとを設けることにより、モータ部の駆動力を車輪側回転部材に円滑に伝達することが可能となる。   Preferably, a plurality of holes are provided on a circumferential track centering on the rotation axis of the revolution member, and a plurality of inner pins are provided on a circumferential track centering on the rotation axis of the wheel side rotation member. ing. This speed reduction part can be composed of one hole and one inner pin from the viewpoint of the operating principle. However, the wall surface of the hole and the inner pin rotate while repeating a contact state and a non-contact state, so that by providing a plurality of holes and a plurality of inner pins, the driving force of the motor unit is smoothly applied to the wheel side rotating member. It is possible to communicate.

好ましくは、内ピンは穴の壁面に当接する転がり軸受を含む。これにより、回転時の公転部材と内ピンとの接触抵抗を低減することができるので、減速部の伝達効率を向上することができる。   Preferably, the inner pin includes a rolling bearing that contacts the wall surface of the hole. Thereby, since the contact resistance of the revolution member and inner pin at the time of rotation can be reduced, the transmission efficiency of a deceleration part can be improved.

好ましくは、上記構成のインホイールモータ駆動装置は、車輪ハブの外周には軸方向に間隔を空けて複列の内輪軌道面が形成され、車輪ハブの径方向外側に車輪ハブと同軸に配置され、複列の内輪軌道面に各々対向するよう複列の外輪軌道面が形成された外方部材と、内輪軌道面と外輪軌道面との間に転動可能に収容された転動体とを備える車輪ハブ軸受を有する。これにより、車輪ハブをインホイールモータ駆動装置に対して回転自在に支持することができる。   Preferably, in the in-wheel motor drive device having the above-described configuration, double-row inner ring raceway surfaces are formed on the outer periphery of the wheel hub at intervals in the axial direction, and are arranged coaxially with the wheel hub on the outer side in the radial direction of the wheel hub. An outer member having a double-row outer ring raceway surface formed to face the double-row inner ring raceway surface, and a rolling element housed in a rollable manner between the inner ring raceway surface and the outer ring raceway surface. Has a wheel hub bearing. Thereby, a wheel hub can be rotatably supported with respect to an in-wheel motor drive device.

本発明のインホイールモータ駆動装置は、電動モータの出力軸と車両の車輪のハブとを連結する減速機を、電動モータの出力軸の偏心部に装着した曲線板の偏心運動を回転運動としてハブに伝達するサイクロ減速機としたので、コンパクトで大きな減速比が得られるものとすることができる。   The in-wheel motor drive device according to the present invention has a reduction gear for connecting an output shaft of an electric motor and a hub of a vehicle wheel as a hub by using an eccentric motion of a curved plate mounted on an eccentric portion of the output shaft of the electric motor as a rotational motion. Therefore, it is possible to obtain a compact and large reduction ratio.

前記曲線板を複数枚装着し、これらの複数枚の曲線板を、互いに偏心運動を打ち消す位相で装着することにより、曲線板の偏心運動に伴う振動を抑制することができる。   By mounting a plurality of the curved plates and mounting the plurality of curved plates at a phase that cancels the eccentric motion, vibrations associated with the eccentric motion of the curved plates can be suppressed.

前記電動モータの出力軸に、曲線板の偏心運動を打ち消す位相でカウンタウェイトを装着することにより、曲線板の偏心運動に伴う重心まわりの振動を抑制することができる。   By attaching a counterweight to the output shaft of the electric motor at a phase that cancels the eccentric motion of the curved plate, vibration around the center of gravity due to the eccentric motion of the curved plate can be suppressed.

前記サイクロ減速機の曲線板の外周を案内する複数の外ピンと、曲線板の内部に設けた複数の貫通孔に嵌挿係合される複数の内ピンとに軸受を嵌着し、これらの軸受の外輪を、それぞれ曲線板の外周と各貫通孔の内周とに転接させることにより、外ピンと曲線板の外周との接触抵抗、および内ピンと貫通孔の内周との接触抵抗を低減し、曲線板の偏心運動を回転運動としてスムーズにハブに伝達することができる。   The bearings are fitted into a plurality of outer pins that guide the outer periphery of the curved plate of the cyclo reducer and a plurality of inner pins that are fitted and engaged with a plurality of through holes provided inside the curved plate. By rolling the outer ring to the outer periphery of each curved plate and the inner periphery of each through hole, the contact resistance between the outer pin and the outer periphery of the curved plate, and the contact resistance between the inner pin and the inner periphery of the through hole are reduced. The eccentric motion of the curved plate can be smoothly transmitted to the hub as a rotational motion.

以下、図面に基づき、本発明の実施形態を説明する。このインホイールモータ駆動装置は電気自動車用のものであり、図１（ａ）に示すように、電動モータ１の回転軸２が、サイクロ減速機１１を介して車輪のハブ２１と同軸上に連結されている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. This in-wheel motor drive device is for an electric vehicle. As shown in FIG. 1A, the rotating shaft 2 of the electric motor 1 is coaxially connected to a wheel hub 21 via a cyclo reducer 11. Has been.

前記電動モータ１は、そのケーシング１ａにアキシヤルギャップを設けて固定したステータ３の間で、ロータ４を回転軸２に取り付けたものである。回転軸２は一端側を軸受５でケーシング１ａに支持され、サイクロ減速機１１のケーシング１１ａに挿通された他端側をハブ２１の中心孔に軸受６で支持されており、ケーシング１１ａに挿通された部分に２つの偏心部２ａ、２ｂが軸方向へ並べて設けられている。   The electric motor 1 has a rotor 4 attached to a rotary shaft 2 between a stator 3 fixed with an axial gap provided in a casing 1a. One end side of the rotary shaft 2 is supported by the casing 1a with the bearing 5, and the other end side inserted into the casing 11a of the cyclo reducer 11 is supported with the bearing 6 in the center hole of the hub 21, and is inserted into the casing 11a. Two eccentric portions 2a and 2b are provided side by side in the axial direction.

前記サイクロ減速機１１は、図２に示すように、外形がなだらかな波状のトロコイド系曲線で形成された２枚の曲線板１２ａ、１２ｂを、それぞれ軸受１３を介して回転軸２の各偏心部２ａ、２ｂに装着し、その偏心運動を外周側でケーシング１１ａに同心円上に固定された複数の外ピン１４で案内するとともに、連結部材１５に同心円上に取り付けられた複数の内ピン１６を、各曲線板１２ａ、１２ｂの内部に同心円上に設けた複数の貫通孔１７に嵌挿係合して、これらの内ピン１６と貫通孔１７の係合によって各曲線板１２ａ、１２ｂの偏心運動を連結部材１５に回転運動として伝達するものである。   As shown in FIG. 2, the cyclo reducer 11 includes two curved plates 12 a and 12 b formed with wavy trochoidal curves having a gentle outer shape, and each eccentric portion of the rotary shaft 2 via a bearing 13. 2a, 2b, and the eccentric movement is guided by a plurality of outer pins 14 concentrically fixed to the casing 11a on the outer peripheral side, and a plurality of inner pins 16 attached concentrically to the connecting member 15 are provided. The curved plates 12a and 12b are fitted into and engaged with a plurality of through holes 17 provided concentrically within the curved plates 12a and 12b, and the eccentric movement of the curved plates 12a and 12b is caused by the engagement of the inner pins 16 and the through holes 17. It is transmitted to the connecting member 15 as a rotational motion.

図１（ｂ）に示すように、前記２枚の曲線板１２ａ、１２ｂは、互いの偏心運動が打ち消されるように１８０°位相をずらして各偏心部２ａ、２ｂに装着されている。また、図１（ｂ）に示すように、各偏心部２ａ、２ｂの両側の回転軸２には、各曲線板１２ａ、１２ｂの偏心運動による振動を打ち消すように、各偏心部２ａ、２ｂの偏心方向と逆側にカウンタウェイト１８が装着されており、２枚の曲線板１２ａ、１２ｂ間の中心点をＧとし、中心点Ｇと各曲線板１２ａ、１２ｂ中心との距離をＬ１、中心点Ｇと各カウンタウェイト１８との距離をＬ２とし、中心点Ｇより右側の曲線板１２ａおよびカウンタウェイト１８の質量をｍ１、中心点Ｇより左側の曲線板１２ｂおよびカウンタウェイト１８の質量をｍ２とし、これらの偏心量をそれぞれε１、ε２とすると、Ｌ１×ｍ１×ε１＝Ｌ２×ｍ２×ε２を満たす関係となっている。   As shown in FIG. 1B, the two curved plates 12a and 12b are attached to the eccentric portions 2a and 2b with a phase difference of 180 ° so that the eccentric motions are canceled out. Further, as shown in FIG. 1 (b), the rotary shafts 2 on both sides of the eccentric parts 2a and 2b have the eccentric parts 2a and 2b so as to cancel vibrations caused by the eccentric movements of the curved plates 12a and 12b. A counterweight 18 is mounted on the opposite side to the eccentric direction, and the center point between the two curved plates 12a and 12b is G, and the distance between the central point G and the center of each curved plate 12a and 12b is L1, and the central point. The distance between G and each counterweight 18 is L2, the mass of the curved plate 12a and the counterweight 18 on the right side from the center point G is m1, the mass of the curved plate 12b and the counterweight 18 on the left side of the center point G is m2, When these eccentricity amounts are ε1 and ε2, respectively, the relationship satisfies L1 × m1 × ε1 = L2 × m2 × ε2.

図３に示すように、前記各外ピン１４と内ピン１６には軸受１９、２０が嵌着され、それらの外輪１９ａ、２０ａがそれぞれ各曲線板１２ａ、１２ｂの外周と各貫通孔１７の内周とに転接するようになっている。したがって、外ピン１４と各曲線板１２ａ、１２ｂの外周との接触抵抗、および内ピン１６と各貫通孔１７の内周との接触抵抗を低減し、各曲線板１２ａ、１２ｂの偏心運動を回転運動としてスムーズに連結部材１５に伝達することができる。   As shown in FIG. 3, bearings 19 and 20 are fitted to the outer pins 14 and the inner pins 16, and the outer rings 19a and 20a are respectively connected to the outer circumferences of the curved plates 12a and 12b and the through holes 17 respectively. It comes in contact with the lap. Therefore, the contact resistance between the outer pin 14 and the outer periphery of each curved plate 12a, 12b and the contact resistance between the inner pin 16 and the inner periphery of each through hole 17 are reduced, and the eccentric motion of each curved plate 12a, 12b is rotated. The movement can be smoothly transmitted to the connecting member 15.

前記ハブ２１は、図１（ａ）に示したように、サイクロ減速機１１の連結部材１５にボルト２２で連結された筒部２１ａと、ボルト２３で車輪に連結されるフランジ部２１ｂとを有し、筒部２１ａおよび筒部２１ａに外嵌された内輪２４と、サイクロ減速機１１のケーシング１１ａにボルト２５で固定された外輪２６と、これらの間に２列に配列されたボール２７とで軸受部が形成されており、連結部材１５の回転運動を車輪に伝達する。なお、前記回転軸２の先端側を軸受６で支持するハブ２１の中心孔には、サイクロ減速機１１側をシールするシール部材２８が取り付けられている。   As shown in FIG. 1A, the hub 21 has a cylindrical portion 21a connected to the connecting member 15 of the cyclo reducer 11 with bolts 22 and a flange portion 21b connected to the wheels with bolts 23. The inner ring 24 that is externally fitted to the cylindrical portion 21a, the outer ring 26 that is fixed to the casing 11a of the cyclo reducer 11 with bolts 25, and the balls 27 that are arranged in two rows therebetween. A bearing portion is formed and transmits the rotational motion of the connecting member 15 to the wheels. A seal member 28 that seals the cyclo reducer 11 side is attached to the center hole of the hub 21 that supports the distal end side of the rotary shaft 2 with the bearing 6.

上述した実施形態では、サイクロ減速機の曲線板を１８０°の偏心位相で２枚設けたが、この曲線板の枚数は任意に設定することができ、例えば、曲線板を３枚設ける場合は、１２０°の偏心位相とすればよい。   In the above-described embodiment, two curved plates of the cyclo reducer are provided with an eccentric phase of 180 °, but the number of the curved plates can be arbitrarily set. For example, when three curved plates are provided, The eccentric phase may be 120 °.

以下、上記の説明と部分的に重複するかもしれないが、図１〜図３を参照して、この発明の一実施形態に係るインホイールモータ駆動装置について再度詳しく説明する。   Hereinafter, although it may partially overlap with the above description, the in-wheel motor drive device according to the embodiment of the present invention will be described again in detail with reference to FIGS.

図１に示すインホイールモータ駆動装置は、駆動力を発生させるモータ部Ａと、モータ部Ａの回転を減速して出力する減速部Ｂと、減速部Ｂからの出力を車輪ホイール２９に伝える車輪ハブ軸受部Ｃとを備え、モータ部Ａと減速部Ｂとはケーシングに収納されている。   The in-wheel motor drive device shown in FIG. 1 includes a motor part A that generates a driving force, a speed reduction part B that decelerates and outputs the rotation of the motor part A, and a wheel that transmits the output from the speed reduction part B to the wheel wheel 29. A hub bearing portion C is provided, and the motor portion A and the speed reduction portion B are accommodated in a casing.

モータ部Ａは、ケーシング１ａ内部に、回転軸２と、回転軸２に嵌合して一体回転するロータ４と、ロータ４と軸方向に隙間を設けてケーシング１ａに固定されるステータ３とを備えるアキシアルギャップモータである。   The motor unit A includes a rotating shaft 2, a rotor 4 that fits and rotates integrally with the rotating shaft 2, and a stator 3 that is fixed to the casing 1 a with a gap in the axial direction. An axial gap motor provided.

回転軸２は、モータ部Ａの駆動力を減速部Ｂに伝達するためにモータ部Ａから減速部Ｂにかけて配置され、減速部Ｂ内に偏心部２ａ，２ｂを有する。また、モータ部Ａの両端と減速部Ｂの左端で軸受５，６によって支持される。さらに、２つの偏心部２ａ，２ｂは、偏心運動による遠心力を互いに打ち消しあうために、１８０°位相を変えて設けられている。   The rotating shaft 2 is arranged from the motor part A to the speed reduction part B in order to transmit the driving force of the motor part A to the speed reduction part B, and has eccentric parts 2a and 2b in the speed reduction part B. Further, it is supported by bearings 5 and 6 at both ends of the motor part A and the left end of the speed reduction part B. Further, the two eccentric portions 2a and 2b are provided with a phase difference of 180 ° in order to cancel the centrifugal force caused by the eccentric motion.

減速部Ｂは、偏心部２ａ，２ｂに回転自在に支持される公転部材としての曲線板１２ａ，１２ｂと、ケーシング１１ａに固定され、曲線板１２ａ，１２ｂの外周部に係合する外周係合部材としての複数の外ピン１４と、曲線板１２ａ，１２ｂの自転運動を連結部材１５に伝達する運動変換機構と、カウンタウェイト１８とを備える。   The deceleration part B is a curved plate 12a, 12b as a revolving member supported rotatably by the eccentric parts 2a, 2b, and an outer peripheral engagement member fixed to the casing 11a and engaged with the outer peripheral part of the curved plates 12a, 12b. A plurality of outer pins 14, a motion conversion mechanism that transmits the rotational motion of the curved plates 12 a and 12 b to the connecting member 15, and a counterweight 18.

曲線板１２ａは、外周部にエピトロコイド等のトロコイド系曲線で構成される複数の波形を有し、一方側端面から他方側端面に貫通する複数の貫通孔１７が曲線板１２ａの自転軸心を中心とする円周軌道上に等間隔に設けられている。なお、曲線板１２ｂは、曲線板１２ａと同じ形状である。   The curved plate 12a has a plurality of waveforms composed of a trochoid curve such as epitrochoid on the outer peripheral portion, and a plurality of through holes 17 penetrating from one end surface to the other end surface have the rotation axis of the curved plate 12a. It is provided at equal intervals on a circumferential track that is the center. The curved plate 12b has the same shape as the curved plate 12a.

外ピン１４は、回転軸２の回転軸心を中心とする円周軌道上に等間隔に設けられる。これは、曲線板１２ａ，１２ｂの公転軌道と一致し、曲線板１２ａ，１２ｂが公転運動すると、曲線形状の波形と外ピン１４とが係合して、曲線板１２ａ，１２ｂに自転運動を生じさせる。また、曲線板１２ａ，１２ｂとの接触抵抗を低減するために、曲線板１２ａ，１２ｂの外周面に当接する位置に針状ころ軸受１４ａを有する。   The outer pins 14 are provided at equal intervals on a circumferential track centering on the rotation axis of the rotation shaft 2. This coincides with the revolution trajectory of the curved plates 12a and 12b, and when the curved plates 12a and 12b revolve, the curved waveform and the outer pin 14 engage with each other, causing the curved plates 12a and 12b to rotate. Let Further, in order to reduce the contact resistance with the curved plates 12a and 12b, a needle roller bearing 14a is provided at a position where the curved plates 12a and 12b come into contact with the outer peripheral surfaces.

カウンタウェイト１８は、円板状で、中心から外れた位置に回転軸２と嵌合する貫通孔を有し、曲線板１２ａ，１２ｂの回転によって生じる慣性モーメントを打ち消すために、各偏心部２ａ，２ｂの外側に偏心部と１８０°位相を変えて配置される。   The counterweight 18 has a disc shape and has a through hole that fits with the rotary shaft 2 at a position off the center. In order to cancel the moment of inertia caused by the rotation of the curved plates 12a and 12b, the counterweights 2a, It is arranged on the outer side of 2b while changing the phase of the eccentric part and 180 °.

運動変換機構は、連結部材１５に保持された複数の内ピン１６と曲線板１２ａ，１２ｂに設けられた貫通孔１７とで構成される。内ピン１６は、連結部材１５の回転軸心を中心とする円周軌道上に等間隔に設けられる。また、曲線板１２ａ，１２ｂとの接触抵抗を低減するために、曲線板１２ａ，１２ｂの貫通孔１７の内壁面に当接する位置に針状ころ軸受１６ａが設けられている。   The motion conversion mechanism includes a plurality of inner pins 16 held by the connecting member 15 and through holes 17 provided in the curved plates 12a and 12b. The inner pins 16 are provided at equal intervals on a circumferential track centering on the rotational axis of the connecting member 15. Further, in order to reduce the contact resistance with the curved plates 12a, 12b, needle roller bearings 16a are provided at positions where they contact the inner wall surfaces of the through holes 17 of the curved plates 12a, 12b.

ここで、減速部Ｂを中心として考えると、回転軸２は電動モータ側回転部材として、連結部材１５は車輪側回転部材としてそれぞれ機能する。   Here, considering the deceleration portion B as the center, the rotating shaft 2 functions as an electric motor side rotating member, and the connecting member 15 functions as a wheel side rotating member.

車輪ハブ軸受部Ｃは、車輪ハブ２１を回転自在に支持するものであり、内周面に間隔を空けて二列の外輪軌道面が形成された外輪２６と、各々の外輪軌道面に対向するように外周および外周に設置された別体の内輪２４に内輪軌道面が形成された車輪ハブ２１と、外輪軌道面と内輪軌道面との間に複列に配置された転動体としての複数のボール２７と、ボール２７を等配に保持する保持器（図示せず）とによって構成される。また、車輪ハブ２１は、車輪ホイール２９の取り付けに用いるため減速部Ｂの反対側端部寄りに形成されたフランジ部２１ｂを有すると共に、減速部Ｂへの塵埃の混入等を防止するために内径側にシール部材２８が設定されている。車輪ハブ２１は、一端をボルト２２によって連結部材１５に固定され、フランジ部２１ｂをボルト２３によって車輪ホイール２９に固定している。なお、外輪２６またはケーシング１１ａの外輪２６側の部分は、ナックル（図示せず）に固定される。   The wheel hub bearing portion C rotatably supports the wheel hub 21, and is opposed to the outer ring 26 in which two rows of outer ring raceway surfaces are formed on the inner peripheral surface with a space therebetween, and to each outer ring raceway surface. As described above, a plurality of rolling hubs arranged in a double row between the outer ring raceway surface and the inner ring raceway surface, and the wheel hub 21 in which the inner ring raceway surface is formed on the outer ring and the separate inner ring 24 installed on the outer circumference as described above. It is comprised by the ball | bowl 27 and the holder | retainer (not shown) which hold | maintains the ball | bowl 27 at equal distribution. The wheel hub 21 has a flange portion 21b formed near the opposite end of the speed reduction portion B for use in attaching the wheel wheel 29, and has an inner diameter for preventing dust from entering the speed reduction portion B. A seal member 28 is set on the side. One end of the wheel hub 21 is fixed to the connecting member 15 by a bolt 22, and the flange portion 21 b is fixed to the wheel wheel 29 by a bolt 23. The outer ring 26 or the portion of the casing 11a on the outer ring 26 side is fixed to a knuckle (not shown).

上記構成のインホイールモータ駆動装置の作動原理を詳しく説明する。   The operation principle of the in-wheel motor drive device having the above configuration will be described in detail.

モータ部Ａは、例えば、ステータ３のコイルに外部から交流電流を供給することによって生じる電磁力を受けて、永久磁石または直流電磁石によって構成されるロータ４が回転する。このとき、コイルに高周波数の電圧を印加する程、ロータ４は高速回転する。   The motor unit A receives, for example, electromagnetic force generated by supplying an alternating current to the coil of the stator 3 from the outside, and the rotor 4 configured by a permanent magnet or a direct current electromagnet rotates. At this time, the rotor 4 rotates at a higher speed as a high-frequency voltage is applied to the coil.

これにより、ロータ４に接続された回転軸２が回転すると、曲線板１２ａ，１２ｂは回転軸２の回転軸心を中心として公転運動する。このとき、外ピン１４が、曲線板１２ａ，１２ｂの曲線形状の波形と係合し、曲線板１２ａ，１２ｂは回転軸２の回転とは逆向きに自転運動する。曲線板１２ａ，１２ｂの貫通孔１７の内壁に接合するように設けられたうちピン１６は、貫通孔１７の内壁に押され、うちピン１６を保持する連結部材１５が回転する。ここで、貫通孔１７の直径はうちピン１６の外径（軸受２０の外輪２０ａを含む最大外径）より大きく設定され、これらの径の差分だけ内ピン１６に対して曲線板１２ａ，１２ｂが動けるようになっており、これらの径の差によって曲線板１２ａ，１２ｂの公転運動や各部在韓の寸法誤差を吸収している。したがって、曲線板１２ａ，１２ｂから連結部材１５への回転の伝達は、曲線板１２ａ，１２ｂの自転運動に相当する回転のみ伝達され、曲線板１２ａ，１２ｂの公転運動に相当する回転は遮断される。そして、連結部材１５の回転は車輪ハブ軸受部Ｃに伝達される。   Thereby, when the rotating shaft 2 connected to the rotor 4 rotates, the curved plates 12 a and 12 b revolve around the rotating shaft center of the rotating shaft 2. At this time, the outer pin 14 is engaged with the curved waveform of the curved plates 12a and 12b, and the curved plates 12a and 12b rotate in the direction opposite to the rotation of the rotary shaft 2. Of the curved plates 12a and 12b, the pin 16 provided to be joined to the inner wall of the through hole 17 is pushed by the inner wall of the through hole 17, and the connecting member 15 holding the pin 16 rotates. Here, the diameter of the through-hole 17 is set to be larger than the outer diameter of the pin 16 (the maximum outer diameter including the outer ring 20a of the bearing 20), and the curved plates 12a and 12b are compared with the inner pin 16 by the difference between these diameters. Because of the difference in the diameters, the revolving motion of the curved plates 12a and 12b and the dimensional errors in each part of Korea are absorbed. Therefore, the transmission of the rotation from the curved plates 12a and 12b to the connecting member 15 is transmitted only for the rotation corresponding to the rotation of the curved plates 12a and 12b, and the rotation corresponding to the revolution of the curved plates 12a and 12b is blocked. . The rotation of the connecting member 15 is transmitted to the wheel hub bearing portion C.

このとき、回転軸２の回転が減速部Ｂによって減速されて連結部材１５に伝達されるので、低トルク、高回転型のモータ部Ａを採用した場合でも、車輪ホイール２９に必要なトルクを伝達することが可能となる。   At this time, since the rotation of the rotating shaft 2 is decelerated by the deceleration unit B and transmitted to the connecting member 15, even when the low torque, high rotation type motor unit A is adopted, the necessary torque is transmitted to the wheel wheel 29. It becomes possible to do.

なお、上記構成の減速部Ｂの減速比は、外ピン１４の数をＺＡ、曲線板１２ａ，１２ｂの波形の数をＺＢとすると、（ＺＡ−ＺＢ）／ＺＢで算出される。図２に示す実施形態では、ＺＡ＝１２、ＺＢ＝１１であるので、減速比は１／１１と、非常に大きな減速比を得ることができる。 Note that the reduction ratio of the speed reduction unit B having the above configuration is calculated as (Z A −Z B ) / Z B where Z A is the number of outer pins 14 and Z B is the number of waveforms of the curved plates 12a and 12b. The In the embodiment shown in FIG. 2, since Z A = 12 and Z B = 11, the reduction ratio is 1/11, and a very large reduction ratio can be obtained.

このように、多段構成とすることなく大きな減速比を得ることができる減速部Ｂを採用することにより、コンパクトで高減速比のインホイールモータ駆動装置を得ることができる。また、外ピン１４および内ピン１６の曲線板１２ａ，１２ｂに当接する位置に針状ころ軸受１４ａ，１６ａを設けたことにより、接触抵抗が低減されるので、減速部Ｂの伝達効率が向上する。   In this way, by adopting the speed reduction unit B that can obtain a large reduction ratio without using a multi-stage configuration, a compact and high reduction ratio in-wheel motor drive device can be obtained. Further, the contact resistance is reduced by providing the needle roller bearings 14a and 16a at the positions where the outer pins 14 and the inner pins 16 come into contact with the curved plates 12a and 12b, so that the transmission efficiency of the speed reducing portion B is improved. .

上述の作動の説明は、各部材の回転に着目して行ったが、実際にはトルクを含む動力が電動モータ１車輪ホイール２９に伝達される。したがって、上述のように減速された動力は高トルクに変換されたものとなっている。   The above description of the operation has been made by paying attention to the rotation of each member, but in reality, power including torque is transmitted to the wheel 1 29 of the electric motor. Therefore, the power decelerated as described above is converted into high torque.

また、上述の作動の説明では、電動モータ１に電力を供給して電動モータ１を駆動させ、電動モータ１からの動力を車輪ホイール２９に伝達させたが、これとは逆に、車両が減速したり坂を下ったりするようなときは、車輪ホイール２９側からの動力を減速部Ｂで高回転低トルクの回転に変換して電動モータ１に伝達し、電動モータ１で発電しても良い。さらに、ここで発電した電力は、バッテリーに蓄電しておき、後で電動モータ１を駆動させたり、車両に備えられた他の電動機器等の作動に用いてもよい。   In the above description of the operation, power is supplied to the electric motor 1 to drive the electric motor 1 and the power from the electric motor 1 is transmitted to the wheel wheel 29. Conversely, the vehicle decelerates. When driving down or going down a hill, the power from the wheel / wheel 29 side may be converted into high-rotation / low-torque rotation by the speed reducer B and transmitted to the electric motor 1, and the electric motor 1 may generate power. . Furthermore, the electric power generated here may be stored in a battery and used later for driving the electric motor 1 or for operating other electric devices provided in the vehicle.

さらに、上述の実施形態の構成にブレーキを加えることもできる。例えば、図１の構成において、ケーシング１ａを図中右側（軸方向）に延長してロータ４の図中右側に空所ができるような構成とし、ロータ４と一体的に回転する回転部材とケーシング１ａに回転不能にかつ軸方向に移動可能なピストンと、このピストンを作動させるシリンダを配置して、車両停止時にピストンと回転部材とを勘合させてロータ４をロックするものとするパーキングブレーキであってもよい。   Furthermore, a brake can be added to the configuration of the above-described embodiment. For example, in the configuration of FIG. 1, the casing 1 a is extended to the right side (axial direction) in the drawing so that a space is formed on the right side of the rotor 4 in the drawing, and a rotating member and casing that rotate integrally with the rotor 4. This is a parking brake in which a piston that is non-rotatable and movable in the axial direction and a cylinder that operates the piston are arranged in 1a and the rotor 4 is locked by engaging the piston and the rotating member when the vehicle is stopped. May be.

または、ロータ４と一体的に回転する回転部材の一部に形成されたフランジおよびケーシング１ａ側に設置された摩擦板をケーシング１ａ側に設置されたシリンダで挟むディスクブレーキであってもよい。さらに、この回転部材の一部にドラムを形成すると共に、ケーシング１ａ側にブレーキシューを固定し、摩擦係合およびセルフエンゲージ作用で回転部材をロックするドラムブレーキを用いることができる。   Alternatively, it may be a disc brake in which a flange formed on a part of a rotating member that rotates integrally with the rotor 4 and a friction plate installed on the casing 1a side are sandwiched by a cylinder installed on the casing 1a side. Further, it is possible to use a drum brake in which a drum is formed on a part of the rotating member, a brake shoe is fixed to the casing 1a side, and the rotating member is locked by friction engagement and self-engagement.

ところで、内ピン１６の外径寸法は貫通孔１７の内径寸法より小さく、内ピン１６と貫通孔１７の内周面とは接触状態と非接触状態とを繰り返しながら回転するので、モータ部Ａの回転を円滑に車輪ホイール２９に伝達する観点からは、内ピン１６を等間隔に複数設けることが望ましい。   By the way, the outer diameter dimension of the inner pin 16 is smaller than the inner diameter dimension of the through hole 17, and the inner pin 16 and the inner peripheral surface of the through hole 17 rotate while repeating a contact state and a non-contact state. From the viewpoint of smoothly transmitting the rotation to the wheel wheel 29, it is desirable to provide a plurality of inner pins 16 at equal intervals.

上記の実施形態に係るインホイールモータ駆動装置を電気自動車３１に採用することにより、ばね下重量を抑えることができる。その結果、走行安定性に優れた電気自動車を得ることができる。   By employing the in-wheel motor drive device according to the above embodiment in the electric vehicle 31, the unsprung weight can be suppressed. As a result, an electric vehicle with excellent running stability can be obtained.

上述した実施形態では、減速部Ｂの曲線板１２ａ，１２ｂを１８０°位相を変えて２枚設けたが、この曲線板の枚数は任意に設定することができ、例えば、曲線板を３枚設ける場合は、１２０°位相を変えて設けるとよい。また、カウンタウェイトは、曲線板と同数設ける必要があるので、曲線板を３枚設ける場合には、各曲線板それぞれと１８０°位相を変えて、３枚のカウンタウェイトを設ける必要がある。   In the above-described embodiment, two curved plates 12a and 12b of the deceleration unit B are provided with 180 ° phase shifts. However, the number of the curved plates can be arbitrarily set, for example, three curved plates are provided. In such a case, it is preferable to change the 120 ° phase. Further, since it is necessary to provide the same number of counter weights as the curved plates, when three curved plates are provided, it is necessary to provide three counter weights by changing the phase of each curved plate by 180 °.

また、上記の実施形態における運動変換機構は、連結部材１５に固定された内ピン１６と、曲線板１２ａ，１２ｂに設けられた貫通孔１７とで構成される例を示したが、これに限ることなく、減速部Ｂの回転を車輪ハブ２１に伝達可能な任意の構成とすることができる。例えば、曲線板に固定された内ピンと、出力部材に形成された穴とで構成される運動変換機構であってもよい。   Moreover, although the motion conversion mechanism in said embodiment showed the example comprised by the inner pin 16 fixed to the connection member 15, and the through-hole 17 provided in curve board 12a, 12b, it is restricted to this. Without any limitation, the rotation of the speed reduction unit B can be configured to be transmitted to the wheel hub 21. For example, it may be a motion conversion mechanism composed of an inner pin fixed to a curved plate and a hole formed in the output member.

また、上記の実施形態において、外ピン１４および内ピン１６に設けた軸受は、径方向の厚み寸法を小さくする観点から針状ころ軸受１４ａ，１６ａとした例を示したが、これに限ることなく、例えば、円筒ころ軸受、円錐ころ軸受、アンギュラ玉軸受、４点接触玉軸受、自動調心ころ軸受等、転動体がころであるか玉であるかを問わず、あらゆる転がり軸受を適用することができる。   Further, in the above embodiment, the example in which the bearings provided on the outer pin 14 and the inner pin 16 are needle roller bearings 14a and 16a from the viewpoint of reducing the thickness dimension in the radial direction has been shown. For example, cylindrical roller bearings, tapered roller bearings, angular contact ball bearings, 4-point contact ball bearings, self-aligning roller bearings, etc., regardless of whether the rolling element is a roller or a ball, any rolling bearing is applied. be able to.

また、上述した実施形態では、電動モータをステータとロータとの間にアキシヤルギャップを設けたものとしたが、電動モータはステータとロータとの間にラジアルギャップを設けたもの等、任意の型式のものを採用することができる。さらに、車輪のハブも実施形態のものに限定されることはなく、任意の型式のものを採用することができる。   In the above-described embodiments, the electric motor is provided with an axial gap between the stator and the rotor. However, the electric motor may be of any type such as a radial gap provided between the stator and the rotor. Can be adopted. Furthermore, the wheel hub is not limited to that of the embodiment, and any type of hub may be employed.

この発明は、電気自動車のみならず、電力から駆動力を得る全ての自動車に適用可能であり、例えば、ハイブリッドカー等への適用も可能である。   The present invention can be applied not only to electric vehicles but also to all vehicles that obtain driving force from electric power, and can also be applied to, for example, hybrid cars.

さらに、上述した実施形態では、モータ部Ａの回転を減速部Ｂに伝達する出力部材として、回転軸２の例を示したが、これに限ることなく、任意の形状とすることができる。例えば、回転軸とロータを一体構成としたフランジ形状の出力部材であってもよい。   Furthermore, although the example of the rotating shaft 2 was shown as an output member which transmits rotation of the motor part A to the deceleration part B in embodiment mentioned above, it can be set as arbitrary shapes, without restricting to this. For example, it may be a flange-shaped output member in which a rotating shaft and a rotor are integrated.

以上、図面を参照してこの発明の実施形態を説明したが、この発明は、図示した実施形態のものに限定されない。図示した実施形態に対して、この発明と同一の範囲内において、あるいは均等の範囲内において、種々の修正や変形を加えることが可能である。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

ａはインホイールモータ駆動装置の実施形態を示す縦断面図、ｂはａの要部を拡大した断面図a is a longitudinal sectional view showing an embodiment of the in-wheel motor drive device, and b is a sectional view in which a main part of a is enlarged. 図１のII−II線に沿った断面図Sectional view along the line II-II in FIG. 図２の要部を拡大して示す断面図Sectional drawing which expands and shows the principal part of FIG.

符号の説明Explanation of symbols

１ 電動モータ、１ａ ケーシング、２ 回転軸、２ａ，２ｂ 偏心部、３ ステータ、４ ロータ、５，６ 軸受、１１ サイクロ減速機、１１ａ ケーシング、１２ａ，１２ｂ 曲線板、１３ 軸受、１４ 外ピン、１４ａ，１６ａ 針状ころ軸受、１５ 連結部材、１６ 内ピン、１７ 貫通孔、１８ カウンタウェイト、１９，２０ 軸受、１９ａ，２０ａ 外輪、２１ ハブ、２１ａ 筒部、２１ｂ フランジ部、２２，２３ ボルト、２４ 内輪、２５ ボルト、２６ 外輪、２７ ボール、２８ シール部材、２９ 車輪ホイール。   DESCRIPTION OF SYMBOLS 1 Electric motor, 1a casing, 2 Rotating shaft, 2a, 2b Eccentric part, 3 Stator, 4 Rotor, 5, 6 Bearing, 11 Cyclo reducer, 11a Casing, 12a, 12b Curved plate, 13 Bearing, 14 Outer pin, 14a , 16a Needle roller bearing, 15 connecting member, 16 inner pin, 17 through hole, 18 counter weight, 19, 20 bearing, 19a, 20a outer ring, 21 hub, 21a cylinder part, 21b flange part, 22, 23 bolt, 24 Inner ring, 25 bolt, 26 outer ring, 27 ball, 28 seal member, 29 wheel.

Claims (15)

電動モータと車両の車輪軸受との間に減速機構を介在したインホイールモータ駆動装置であって、
前記電動モータの出力部にサイクロイド減速機構の偏心部を形成し、前記偏心部に曲線板を装着し、前記曲線板の偏心運動を車輪軸受へ回転運動として伝達する構成としたことを特徴とするインホイールモータ駆動装置。 An in-wheel motor drive device in which a reduction mechanism is interposed between an electric motor and a wheel bearing of a vehicle,
An eccentric part of a cycloid reduction mechanism is formed at the output part of the electric motor, a curved plate is attached to the eccentric part, and the eccentric movement of the curved plate is transmitted as a rotational motion to a wheel bearing. In-wheel motor drive device. 前記曲線板を複数枚装着し、これらの複数枚の曲線板を、互いに偏心運動を打ち消す位相で装着した請求項１に記載のインホイールモータ駆動装置。 2. The in-wheel motor drive device according to claim 1, wherein a plurality of the curved plates are mounted, and the plurality of curved plates are mounted in a phase that cancels out an eccentric motion. 前記電動モータの出力軸に、前記曲線板の偏心運動を打ち消す位相でカウンタウェイトを装着した請求項１または２に記載のインホイールモータ駆動装置。 The in-wheel motor drive device according to claim 1 or 2, wherein a counterweight is attached to an output shaft of the electric motor at a phase that cancels the eccentric motion of the curved plate. 前記サイクロ減速機の曲線板の外周を案内する複数の外ピンと、前記曲線板の内部に設けた複数の貫通孔に嵌挿係合される複数の内ピンとに軸受を嵌着し、これらの軸受の外輪を、それぞれ前記曲線板の外周と前記各貫通孔の内周とに転接させるようにした請求項１乃至３のいずれかに記載のインホイールモータ駆動装置。 The bearings are fitted to a plurality of outer pins that guide the outer periphery of the curved plate of the cyclo reducer and a plurality of inner pins that are fitted and engaged with a plurality of through holes provided in the curved plate. The in-wheel motor drive device according to any one of claims 1 to 3, wherein the outer ring is in rolling contact with the outer periphery of the curved plate and the inner periphery of each through hole. 前記車両が電気自動車である請求項１乃至４のいずれかに記載のインホイールモータ駆動装置。 The in-wheel motor drive device according to any one of claims 1 to 4, wherein the vehicle is an electric vehicle. 電動モータ側回転部材を回転駆動するモータ部と、
前記電動モータ側回転部材の回転を減速して車輪側回転部材に伝達する減速部と、
前記車輪側回転部材に固定連結された車輪ハブとを備え、
前記電動モータ側回転部材は偏心部を有し、
前記減速部は、
前記偏心部に回転自在に保持されて、前記電動モータ側回転部材の回転に伴ってその回転軸心を中心とする公転運動を行う公転部材と、
前記公転部材の外周部に係合して公転部材の自転運動を生じさせる外周係合部材と、
前記公転部材の自転運動を、前記電動モータ側回転部材の回転軸心を中心とする回転運動に変換して前記車輪側回転部材に伝達する運動変換機構とを含む、インホイールモータ駆動装置。 A motor unit that rotationally drives the electric motor side rotating member;
A speed reducer that decelerates the rotation of the electric motor side rotating member and transmits it to the wheel side rotating member;
A wheel hub fixedly connected to the wheel side rotating member;
The electric motor side rotating member has an eccentric part,
The deceleration part is
A revolving member that is rotatably held by the eccentric part and performs a revolving motion around its rotation axis as the electric motor side rotating member rotates,
An outer peripheral engagement member that engages with an outer peripheral portion of the revolution member and causes the revolution member to rotate.
An in-wheel motor drive device comprising: a motion conversion mechanism that converts the rotational motion of the revolving member into a rotational motion centered on a rotational axis of the electric motor-side rotating member and transmits the rotational motion to the wheel-side rotating member. 前記公転部材は、その外周部に複数の波形を有し、
前記外周係合部材は、前記公転部材の公転軌道上に配置された複数の外ピンを有する、請求項６に記載のインホイールモータ駆動装置。 The revolving member has a plurality of corrugations on its outer periphery,
The in-wheel motor drive device according to claim 6, wherein the outer peripheral engagement member has a plurality of outer pins arranged on a revolution track of the revolution member. 前記外ピンは、前記公転部材の外周部に当接する転がり軸受を含む、請求項７に記載のインホイールモータ駆動装置。 The in-wheel motor drive device according to claim 7, wherein the outer pin includes a rolling bearing that abuts on an outer peripheral portion of the revolving member. 前記電動モータ側回転部材の偏心部は、偏心運動による遠心力を互いに打消し合う位相で配置された第１偏心部と、第２偏心部とを含み、
前記公転部材は、前記第１偏心部に回転自在に保持された第１公転部材と、前記第１公転部材と同じ外周形状を有して前記第２偏心部に回転自在に保持された第２公転部材とを含む、請求項６〜８のいずれかに記載のインホイールモータ駆動装置。 The eccentric part of the electric motor side rotating member includes a first eccentric part and a second eccentric part arranged in a phase in which centrifugal forces due to eccentric motion cancel each other,
The revolving member has a first revolving member rotatably held by the first eccentric portion, and a second revolving member having the same outer peripheral shape as the first revolving member and rotatably held by the second eccentric portion. The in-wheel motor drive device in any one of Claims 6-8 containing a revolution member. 前記公転部材の偏心運動による慣性モーメントを打消す位相で前記電動モータ側回転部材に装着したカウンタウェイトをさらに備える、請求項６〜９のいずれかに記載のインホイールモータ駆動装置。 The in-wheel motor drive device in any one of Claims 6-9 further equipped with the counterweight with which the said electric motor side rotation member was mounted | worn with the phase which cancels the moment of inertia by the eccentric motion of the said revolution member. 前記運動変換機構は、前記公転部材と前記車輪側回転部材のうちの一方に設けられた内ピンと、前記公転部材と前記車輪側回転部材のうちの他方に形成され、前記内ピンの外径より所定分だけ径が大きい前記内ピンを受入れる穴とを有する、請求項６〜１０のいずれかに記載のインホイールモータ駆動装置。 The motion conversion mechanism is formed on an inner pin provided on one of the revolving member and the wheel-side rotating member, and on the other of the revolving member and the wheel-side rotating member, and is based on an outer diameter of the inner pin. The in-wheel motor drive device according to any one of claims 6 to 10, further comprising a hole for receiving the inner pin whose diameter is larger by a predetermined amount. 前記穴は、前記公転部材に設けられ、
前記内ピンは、前記車輪側回転部材に保持されている、請求項１１に記載のインホイールモータ駆動装置。 The hole is provided in the revolving member,
The in-wheel motor drive device according to claim 11 with which said inner pin is held by said wheel side rotation member. 前記穴は、前記公転部材の自転軸心中心とする円周軌道上に複数個設けられ、
前記内ピンは、前記車輪側回転部材の回転軸心を中心とする円周軌道上に複数個設けられている、請求項１２に記載のインホイールモータ駆動装置。 A plurality of the holes are provided on a circumferential track around the rotation axis of the revolving member,
The in-wheel motor drive device according to claim 12, wherein a plurality of the inner pins are provided on a circumferential track centering on a rotation axis of the wheel side rotation member. 前記内ピンは、前記穴の壁面に当接する転がり軸受を含む、請求項１１〜１３のいずれかに記載のインホイールモータ駆動装置。 The in-wheel motor drive device according to any one of claims 11 to 13, wherein the inner pin includes a rolling bearing that abuts against a wall surface of the hole. 前記車輪ハブの外周には、軸方向に間隔を空けて複列の内輪軌道面が形成され、前記車輪ハブの径方向外側に前記車輪ハブと同軸に配置され、前記複列の内輪軌道面に各々対向するよう複列の外輪軌道面が形成された外方部材と、前記内輪軌道面と前記外輪軌道面との間に転動可能に収容された転動体とを備える車輪ハブ軸受が設けられた、請求項６〜１４のいずれかに記載のインホイールモータ駆動装置。
A double-row inner ring raceway surface is formed on the outer periphery of the wheel hub with an interval in the axial direction, and is arranged coaxially with the wheel hub on the outer side in the radial direction of the wheel hub. A wheel hub bearing is provided that includes an outer member in which double-row outer ring raceway surfaces are formed so as to face each other, and a rolling element that is accommodated so as to roll between the inner ring raceway surface and the outer ring raceway surface. The in-wheel motor drive device according to any one of claims 6 to 14.
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