JP2010121701A - In-wheel motor driving device - Google Patents

In-wheel motor driving device Download PDF

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JP2010121701A
JP2010121701A JP2008295550A JP2008295550A JP2010121701A JP 2010121701 A JP2010121701 A JP 2010121701A JP 2008295550 A JP2008295550 A JP 2008295550A JP 2008295550 A JP2008295550 A JP 2008295550A JP 2010121701 A JP2010121701 A JP 2010121701A
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motor
filter
wheel
rotation
output shaft
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Ken Yamamoto
山本  憲
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Ntn Corp
Ntn株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-wheel motor driving device in which a filter can be installed while restricting space. <P>SOLUTION: This in-wheel motor driving device 21 has a motor part A for rotatingly driving motor side rotary members 25 and 35, a speed reduction part B for transmitting rotation of the motor side rotary members 25 and 35 to a wheel side rotary member 28, and a wheel hub 32 fixed and connected to the wheel side rotary member 28. The speed reduction part B has eccentric members 25a and 25b eccentrically joined from the axis O of the motor side rotary members 25 and 35, curved plates 26a and 26b relatively rotatably installing the inner periphery on the outer periphery of the eccentric members 25a and 25b and making a revolving motion around the axis O in response to rotation of the motor side rotary members 25 and 35, an outer pin 27 engaging with an outer peripheral part of the curved plates 26a and 26b, and an inner pin 31 joined to the wheel side rotary member 28. The motor side rotary members 25 and 35 have an axial oil passage 57 for supplying lubricating oil to the speed reduction part B, and a filter member 67 for filtering the lubricating oil. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、インホイールモータ駆動装置の内部潤滑に関する。   The present invention relates to internal lubrication of an in-wheel motor drive device.

従来のインホイールモータ駆動装置は、例えば、特開2008−44537号公報(特許文献1)に記載されている。特許文献1のインホイールモータ駆動装置は、駆動モータと、この駆動モータから駆動力を入力されて回転数を減速して車輪側に出力する減速機と、減速機の出力軸と結合する車輪のハブ部材とが同軸かつ直列に配列されている。この減速機はサイクロイド減速機構であることから、従来の減速機として一般的な遊星歯車式減速機構と比較して高減速比が得られる。したがって、駆動モータの要求トルクを小さくすることができ、インホイールモータ駆動装置のサイズおよび重量を低減することができるという点で頗る有利である。また、このインホイールモータ駆動装置は、外周係合部材がケーシングに針状ころ軸受によって回転自在に支持されている。したがって、公転部材と外周係合部材との接触抵抗を大いに低減することができ、減速機のトルク損失を防止することができる点で頗る有利である。
特開2008−44537号公報
A conventional in-wheel motor drive device is described in, for example, Japanese Patent Application Laid-Open No. 2008-44537 (Patent Document 1). The in-wheel motor drive device of Patent Document 1 includes a drive motor, a speed reducer that receives a driving force from the drive motor and decelerates the number of rotations to output to the wheel side, and a wheel coupled to the output shaft of the speed reducer. The hub members are arranged coaxially and in series. Since this speed reducer is a cycloid speed reduction mechanism, a high speed reduction ratio can be obtained as compared with a planetary gear speed reduction mechanism that is general as a conventional speed reducer. Therefore, the required torque of the drive motor can be reduced, which is advantageous in that the size and weight of the in-wheel motor drive device can be reduced. In this in-wheel motor drive device, the outer peripheral engagement member is rotatably supported by the casing by a needle roller bearing. Therefore, the contact resistance between the revolution member and the outer peripheral engagement member can be greatly reduced, and the torque loss of the reduction gear can be prevented.
JP 2008-44537 A

このサイクロイド減速機構を潤滑するにあたり、サイクロイド減速機構の回転要素を潤滑油に浸しておく油浴潤滑方式を採用すれば、回転要素の回転による遠心力で潤滑油が半径方向外方へ飛ばされ、回転中心付近で潤滑油が不足する傾向にあり、高回転時には軸受の焼付き等、早期損傷の虞がある。そこで、ポンプで潤滑油を回転中心に圧送することにより回転要素を潤滑する軸心給油方式を採用することが考えられる。軸心給油方式の場合、潤滑油はサイクロイド減速機構の内部を循環するところ、摩耗粉、金属粉などのスラッジおよび不純物が潤滑油に混入する。このため、潤滑油から不純物を除去するためのフィルタが必要となる。   In lubricating this cycloid reduction mechanism, if an oil bath lubrication method in which the rotating element of the cycloid reduction mechanism is immersed in the lubricating oil is adopted, the lubricating oil is blown outward in the radial direction by the centrifugal force due to the rotation of the rotating element, Lubricating oil tends to be insufficient in the vicinity of the rotation center, and there is a risk of early damage such as seizure of the bearing at high rotation. In view of this, it is conceivable to adopt an axial oil supply system in which the rotating element is lubricated by pumping the lubricating oil to the center of rotation. In the case of the shaft center oil supply system, the lubricating oil circulates in the cycloid reduction mechanism, and sludge such as wear powder and metal powder and impurities are mixed into the lubricating oil. For this reason, a filter for removing impurities from the lubricating oil is required.

一方で、インホイールモータ駆動装置は、車輪のロードホイール内に設けられて車輪を個々に駆動するため、小型化および軽量化の要求が厳しい。フィルタを、特許文献1に記載のインホイールモータ駆動装置の外側に取り付けることとすれば、インホイールモータ駆動装置が大型化してしまう。つまり、インホイールモータ駆動装置へのフィルタの取り付けにおいては、取付スペースの問題がある。   On the other hand, since the in-wheel motor drive device is provided in the road wheel of the wheel and individually drives the wheel, there is a severe demand for reduction in size and weight. If the filter is attached to the outside of the in-wheel motor drive device described in Patent Document 1, the in-wheel motor drive device will be enlarged. That is, there is a problem of installation space in attaching the filter to the in-wheel motor drive device.

本発明は、上述の実情に鑑み、スペース上何ら制約を受けることなく、フィルタを取り付けることができるインホイールモータ駆動装置を提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide an in-wheel motor drive device to which a filter can be attached without being restricted in space.

この目的のため本発明によるインホイールモータ駆動装置は、モータ側回転部材を回転駆動するモータ部と、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る。そして減速部は、モータ側回転部材の軸線から偏心してモータ側回転部材の一端に結合した円盤形状の偏心部材と、内周が偏心部材の外周に相対回転可能に取り付けられ、モータ側回転部材の回転に伴って軸線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、車輪側回転部材と結合し、公転部材の自転運動を取り出す内側係合部材とを有し、モータ側回転部材は、潤滑油を減速部に供給する油路と、該油路に内装されて潤滑油を濾過するフィルタ部材とを有する。   For this purpose, an in-wheel motor driving device according to the present invention includes a motor unit that rotationally drives a motor-side rotating member, a speed-reducing unit that decelerates the rotation of the motor-side rotating member and transmits the rotation to the wheel-side rotating member, and wheel-side rotation. And a wheel hub fixedly connected to the member. The speed reducer is attached to a disc-shaped eccentric member eccentric from the axis of the motor-side rotating member and coupled to one end of the motor-side rotating member, and an inner periphery is attached to the outer periphery of the eccentric member so as to be relatively rotatable. A revolving member that revolves around the axis as it rotates, a peripheral engaging member that engages with the outer periphery of the revolving member to cause the revolving member to rotate, and a wheel-side revolving member that is revolved. An internal engagement member that extracts the rotation of the member, and the motor-side rotation member includes an oil passage that supplies lubricating oil to the speed reduction unit, and a filter member that is built in the oil passage and filters the lubricating oil. .

かかる本発明によれば、潤滑油を減速部に供給する油路と、該油路に内装されて潤滑油を濾過するフィルタ部材とを有することから、フィルタ部材をインホイールモータ駆動装置の内部に取り付けることが可能になり、取付スペースの問題が解消する。   According to the present invention, the filter member is provided inside the in-wheel motor drive device because the oil passage for supplying the lubricant to the speed reduction unit and the filter member that is installed in the oil passage and filters the lubricant are provided. It becomes possible to install, and the problem of installation space is solved.

ここで好ましくは、モータ側回転部材は、モータ部の内部に回転自在に設けられたモータ出力軸と、減速部の内部に回転自在に設けられて、モータ出力軸の一方端部と結合する減速部入力軸とを含み、フィルタ部材はモータ出力軸に設けられたモータ出力軸油路に内装される。かかる実施形態によれば、フィルタ部材は、モータ出力軸に設けられたモータ出力軸油路に内装されることから、減速部の外にフィルタ部材を取り付けることが可能になり、モータ部からフィルタ部材を交換することが可能になる。したがって、メンテナンス効率が向上する。   Preferably, the motor-side rotating member is a motor output shaft that is rotatably provided inside the motor unit, and a speed reducer that is rotatably provided inside the speed reducer and is coupled to one end of the motor output shaft. The filter member is housed in a motor output shaft oil passage provided on the motor output shaft. According to this embodiment, since the filter member is built in the motor output shaft oil passage provided on the motor output shaft, the filter member can be attached to the outside of the speed reduction unit. Can be exchanged. Accordingly, maintenance efficiency is improved.

本発明は一実施形態に限定されるものではないが、フィルタ部材は減速部入力軸から遠い側にあるモータ出力軸の他方端部と螺合してもよい。かかる実施形態によれば、モータ部の外方からフィルタ部材を容易に交換することができる。   Although the present invention is not limited to one embodiment, the filter member may be screwed with the other end portion of the motor output shaft on the side far from the speed reduction portion input shaft. According to this embodiment, the filter member can be easily replaced from the outside of the motor unit.

好ましくは、フィルタ部材はモータ出力軸の前進回転方向と逆方向に回転してモータ出力軸の他方端部と螺合する、かかる実施形態によれば、モータ出力軸の前進回転中に螺合が緩むことを防止することができる。   Preferably, the filter member rotates in the direction opposite to the forward rotation direction of the motor output shaft and is screwed with the other end portion of the motor output shaft. According to such an embodiment, the screw engagement is performed during the forward rotation of the motor output shaft. It is possible to prevent loosening.

好ましくは、モータ部はモータ部の外郭を形成するモータケーシングを有し、モータケーシングはモータ出力軸の他方端部と対面する位置に蓋部を備える。かかる実施形態によれば、モータケーシングの蓋部を開閉することにより、フィルタ部材を交換することが可能になる。したがって、メンテナンス効率が向上する。   Preferably, the motor unit includes a motor casing that forms an outline of the motor unit, and the motor casing includes a lid at a position facing the other end of the motor output shaft. According to this embodiment, the filter member can be exchanged by opening and closing the lid of the motor casing. Accordingly, maintenance efficiency is improved.

本発明は一実施形態に限定されるものではないが、フィルタ部材はモータ側回転部材と同軸に固定された円筒形状を有してもよい。円筒形状は、横断面が円筒である他、星形や多角形等、仮想の内接円および外接円が円であるものも含む。かかる実施形態によれば、モータ側回転部材の回転時の遠心力を利用して、潤滑油をフィルタ部材に半径方向外方へ通じさせることが可能になり、潤滑油を円滑に流すことができる。   Although the present invention is not limited to one embodiment, the filter member may have a cylindrical shape fixed coaxially with the motor-side rotating member. Cylindrical shapes include those in which a virtual inscribed circle and circumscribed circle are circles, such as a star shape and a polygon, in addition to a cylindrical cross section. According to such an embodiment, it becomes possible to cause the lubricating oil to pass through the filter member radially outward using the centrifugal force during rotation of the motor side rotating member, and to smoothly flow the lubricating oil. .

好ましくは、油路はモータ側回転部材に沿って延在し、フィルタ部材は案内部を介して油路の内壁から離れた位置で支持され、フィルタ部材の内周が、外部から潤滑油を受け入れ、フィルタ部材の外周と油路の内壁との隙間が、減速部へ潤滑油を供給する。かかる実施形態によれば、案内部がフィルタ部材を支持することから、フィルタ部材がモータ側回転部材とともに高速回転しても、遠心力でフィルタ部材が変位ないし変形する虞を回避することができる。また、フィルタ部材の内周で不純物を捕捉することが可能になり、フィルタ部材の交換とともに不純物を油路から除去することができる。   Preferably, the oil passage extends along the motor-side rotating member, the filter member is supported at a position away from the inner wall of the oil passage through the guide portion, and the inner periphery of the filter member receives the lubricating oil from the outside. The gap between the outer periphery of the filter member and the inner wall of the oil passage supplies lubricating oil to the speed reduction unit. According to this embodiment, since the guide portion supports the filter member, it is possible to avoid the possibility that the filter member is displaced or deformed by centrifugal force even when the filter member rotates at a high speed together with the motor-side rotating member. Moreover, it becomes possible to capture | acquire an impurity by the inner periphery of a filter member, and an impurity can be removed from an oil path with replacement | exchange of a filter member.

本発明は一実施形態に限定されるものではなく、フィルタ部材は、紙製、繊維の集合体、顆粒の集合体等どのようなものであってもよいが、磁化された金属製であってもよい。磁化された金属製は、鉄系、コバルト系の金属のような磁化可能な金属である。かかる実施形態によれば、金属の不純物を容易に捕捉することができる。また、フィルタ部材の強度が大きくなり、高速回転時の遠心力に対する信頼性が向上する。   The present invention is not limited to one embodiment, and the filter member may be any material such as paper, fiber aggregate, granule aggregate, etc. Also good. The magnetized metal is a magnetizable metal such as an iron-based or cobalt-based metal. According to this embodiment, metal impurities can be easily captured. Further, the strength of the filter member is increased, and the reliability with respect to centrifugal force during high-speed rotation is improved.

あるいは、案内部はフィルタ部材の外郭を形成するフィルタカバーと一体結合し、これら案内部およびフィルタカバーは樹脂製であってもよい。かかる実施形態によれば、フィルタカバーを射出成形によって容易に製作することが可能となり、コスト上有利である。   Alternatively, the guide portion may be integrally coupled with a filter cover that forms the outer shell of the filter member, and the guide portion and the filter cover may be made of resin. According to this embodiment, the filter cover can be easily manufactured by injection molding, which is advantageous in terms of cost.

あるいは、案内部は前記フィルタ部材の外郭を形成するフィルタカバーと一体結合し、これら案内部およびフィルタカバーは軽金属製であってもよい。軽金属は、アルミニウム、マグネシウム等である。かかる実施形態によれば、フィルタ部材の強度が大きくなり、高速回転時の遠心力に対する信頼性が向上する。   Alternatively, the guide portion may be integrally coupled with a filter cover that forms the outline of the filter member, and the guide portion and the filter cover may be made of light metal. The light metal is aluminum, magnesium or the like. According to this embodiment, the strength of the filter member is increased, and the reliability with respect to centrifugal force during high-speed rotation is improved.

本発明は一実施形態に限定されるものではなく、潤滑油の供給が軸心給油方式あれば他の循環方式であってもよいが、潤滑油を吐出するポンプをさらに備え、潤滑油の循環経路が、ポンプから、油路と、フィルタ部材と、減速部とを順次流れるよう構成されてもよい。かかる実施形態によれば、フィルタ部材を経由した清浄な潤滑油で減速部を潤滑することができる。なお、減速部を潤滑後、潤滑油はオイル溜まりに集められ、次にポンプへ戻されてもよいし、他の部材を潤滑した後にオイル溜まりに集められてもよい。また、潤滑油の循環経路の一部をウォータージャケット内に配設して、潤滑油を冷却してもよい。   The present invention is not limited to one embodiment, and any other circulation system may be used as long as the lubrication oil supply is an axial lubrication system. A path | route may be comprised so that an oil path, a filter member, and a deceleration part may flow sequentially from a pump. According to this embodiment, the speed reduction part can be lubricated with clean lubricating oil that has passed through the filter member. The lubricating oil may be collected in the oil reservoir after lubricating the speed reducing portion, and then returned to the pump, or may be collected in the oil reservoir after lubricating other members. Further, the lubricating oil may be cooled by disposing a part of the circulation path of the lubricating oil in the water jacket.

このように本発明は、モータ側回転部材は、潤滑油を減速部に供給する油路と、該油路に内装されて潤滑油を濾過するフィルタ部材とを有することから、フィルタ部材をインホイールモータ駆動装置の内部に取り付けることが可能になり、取付スペースの問題が解消する。したがって、インホイールモータ駆動装置が車両の車輪を個々に駆動する場合であっても、車輪のロードホイール内部にインホイールモータ駆動装置を何ら障害なく配置することができる。   Thus, in the present invention, the motor-side rotating member has an oil passage that supplies lubricating oil to the speed reduction unit and a filter member that is built in the oil passage and filters the lubricating oil. It becomes possible to install the motor drive device, and the problem of installation space is solved. Therefore, even when the in-wheel motor driving device drives the wheels of the vehicle individually, the in-wheel motor driving device can be arranged inside the road wheel of the wheels without any obstacles.

以下、本発明の実施の形態を、図面に示す実施例に基づき詳細に説明する。図1は、本実施例のインホイールモータ駆動装置を示す縦断面図である。図2は、図1のII−IIにおける横断面図である。   Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings. FIG. 1 is a longitudinal sectional view showing an in-wheel motor drive device of the present embodiment. 2 is a cross-sectional view taken along the line II-II in FIG.

車両減速部の一例としてのインホイールモータ駆動装置21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からの出力を図示しない駆動輪に伝える車輪ハブ軸受部Cとを備える。モータ部Aはモータ部の外郭を形成するモータケーシング22a、ポンプケーシング22p、および端部ケーシング22tに収納され、減速部Bは減速部の外郭を形成する減速部ケーシング22bに収納され、車輪ハブ軸受部Cは減速部ケーシング22bに固定された軸受部ケーシング22cに回転自在に支持されて、例えば電気自動車のホイールハウジング内に取り付けられる。あるいは鉄道車両の台車に取り付けられる。これらモータケーシング22a、ポンプケーシング22p、端部ケーシング22t、減速部ケーシング22b、および軸受部ケーシング22cは1個のケーシング22を構成する。   An in-wheel motor drive device 21 as an example of a vehicle speed reduction unit is not shown in the figure, 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 an output from the speed reduction part B And a wheel hub bearing portion C for transmitting to the drive wheels. The motor part A is housed in a motor casing 22a, a pump casing 22p, and an end casing 22t that form the outer part of the motor part, and the speed reducing part B is housed in a speed reducing part casing 22b that forms the outer part of the speed reducing part. The part C is rotatably supported by a bearing part casing 22c fixed to the speed reduction part casing 22b, and is attached, for example, in a wheel housing of an electric vehicle. Or it is attached to the bogie of a railway vehicle. The motor casing 22 a, the pump casing 22 p, the end casing 22 t, the speed reduction section casing 22 b, and the bearing section casing 22 c constitute one casing 22.

モータ部Aは、モータケーシング22aに固定されるステータ23と、ステータ23の内側に径方向に開いた隙間を介して対面する位置に配置されるロータ24と、ロータ24の内側に固定連結されてロータ24と一体回転するモータ出力軸35とを備えるラジアルギャップモータである。あるいはアキシャルギャップモータであってもよい。   The motor part A is fixedly connected to the stator 23 fixed to the motor casing 22a, the rotor 24 arranged at a position facing the stator 23 through a gap opened radially in the stator 23, and the rotor 24 inside. It is a radial gap motor including a motor output shaft 35 that rotates integrally with the rotor 24. Alternatively, an axial gap motor may be used.

ケーシング22の一部であるポンプケージング22pは、モータ部Aの一方端で減速部Bとの境界を形成するとともに、軸受62を介してモータ出力軸35の一方端部を回転自在に支持する。さらにポンプケージング22pは、オイルポンプ51を備える。ケーシング22の一部である端部ケーシング22tは、モータ部Aの他方端でモータ部Aの端面を形成するとともに、軸受63を介してモータ出力軸35の他方端部を回転自在に支持する。端部ケーシング22tはモータ部Aの端部であるとともに、インホイールモータ駆動装置21の端部でもある。   The pump casing 22 p which is a part of the casing 22 forms a boundary with the speed reduction part B at one end of the motor part A, and rotatably supports one end part of the motor output shaft 35 via the bearing 62. Further, the pump casing 22 p includes an oil pump 51. The end casing 22t which is a part of the casing 22 forms the end face of the motor part A at the other end of the motor part A, and rotatably supports the other end part of the motor output shaft 35 via the bearing 63. The end casing 22t is an end portion of the motor portion A and also an end portion of the in-wheel motor drive device 21.

モータ出力軸35の一端は、減速部Bの内部に回転自在に設けられた減速部入力軸25と結合する。モータ部Aから遠い側にある減速部入力軸25の一端は、軸受64を介して、後述する車輪ハブ32に回転自在に支持される。またモータ部Aに近い側にある減速部入力軸25の他端はモータ出力軸35の一端と結合する。これら両端間の中程で、減速部入力軸25の外周には、偏心部材25a,25bが形成される。2つの円盤形状の偏心部材25a,25bは、偏心運動による遠心力で発生する振動を互いに打ち消し合うために、周方向180°位相を変えて設けられている。モータ出力軸35および減速部入力軸25は、モータ部Aの駆動力を減速部Bに伝達するモータ側回転部材を構成する。   One end of the motor output shaft 35 is coupled to a speed reducing portion input shaft 25 that is rotatably provided inside the speed reducing portion B. One end of the speed reduction part input shaft 25 on the side far from the motor part A is rotatably supported by a wheel hub 32 described later via a bearing 64. Further, the other end of the speed reducer input shaft 25 on the side close to the motor portion A is coupled to one end of the motor output shaft 35. In the middle between these two ends, eccentric members 25a and 25b are formed on the outer periphery of the speed reducing portion input shaft 25. The two disc-shaped eccentric members 25a and 25b are provided with a 180 ° phase change in the circumferential direction in order to cancel each other the vibrations generated by the centrifugal force due to the eccentric motion. The motor output shaft 35 and the speed reduction part input shaft 25 constitute a motor side rotation member that transmits the driving force of the motor part A to the speed reduction part B.

減速部Bは、減速部ケーシング22bと、減速部入力軸25と、減速部入力軸25に結合した偏心部材25a,25bと、偏心部材25a,25bに回転自在に保持される公転部材としての曲線板26a,26bと、曲線板26a,26b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27と、車輪側回転部材28と、車輪側回転部材28と結合し、曲線板26a,26bの自転運動を取り出す内側係合部材としての内ピン31と、曲線板26a,26bの隙間に取り付けられてこれら曲線板26a,26bの端面に当接して曲線板の傾きを防止するセンターカラー29と、補強部材66とを有する。   The speed reduction part B is a speed reduction part casing 22b, a speed reduction part input shaft 25, eccentric members 25a and 25b coupled to the speed reduction part input shaft 25, and a curve as a revolving member held rotatably by the eccentric members 25a and 25b. The curved plates 26a, 26b, a plurality of outer pins 27 as outer peripheral engaging members that engage with the outer peripheral portions of the curved plates 26a, 26b, the wheel-side rotating member 28, and the wheel-side rotating member 28 are coupled to each other. , 26b, an inner pin 31 serving as an inner engagement member for taking out the rotation movement, and a center collar which is attached to a gap between the curved plates 26a, 26b and abuts against the end faces of these curved plates 26a, 26b to prevent the curved plate from tilting. 29 and a reinforcing member 66.

車輪側回転部材28は、フランジ部28aと軸部28bとを有する。フランジ部28aの端面には、車輪側回転部材28の回転軸線Oを中心とする円周上の等間隔に内ピン31を固定する穴が形成されている。軸部28bの外径面には、車輪ハブ32が固定されている。   The wheel side rotation member 28 includes a flange portion 28a and a shaft portion 28b. Holes for fixing the inner pins 31 at equal intervals on the circumference centering on the rotation axis O of the wheel side rotation member 28 are formed in the end face of the flange portion 28a. A wheel hub 32 is fixed to the outer diameter surface of the shaft portion 28b.

図2を参照して、曲線板26b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30a,30bを有する。貫通孔30aは、曲線板26bの自転軸心Xを中心とする円周上に等間隔に複数個設けられており、内ピン31を受入れる。また、貫通孔30bは、曲線板26bの中心Xに設けられており、曲線板26bの内周になる。曲線板26bは、偏心部材25bの外周に相対回転可能に取り付けられる。   Referring to FIG. 2, the curved plate 26 b has a plurality of corrugations composed of trochoidal curves such as epitrochoids on the outer periphery, and a plurality of through holes 30 a and 30 b penetrating from one end face to the other end face. Have A plurality of through holes 30a are provided at equal intervals on the circumference centering on the rotation axis X of the curved plate 26b, and receive the inner pins 31. The through hole 30b is provided at the center X of the curved plate 26b, and is the inner periphery of the curved plate 26b. The curved plate 26b is attached to the outer periphery of the eccentric member 25b so as to be relatively rotatable.

フランジ部28aから離れた側にある内ピン31の端部には、補強部材66が設けられている。補強部材66は、内ピン31先端と結合する円環形状の円環部66bと、円環部66bの内径面から軸方向にモータ部Aへ延びる円筒部66cとを含む。曲線板26a、26bから一部の内ピン31に負荷される荷重は円環部66bを介して全ての内ピン31によって支持されるため、内ピン31に作用する応力を低減させ耐久性を向上させることができる。円筒部66cの先端は、オイルポンプ51と駆動結合する。   A reinforcing member 66 is provided at the end of the inner pin 31 on the side away from the flange portion 28a. The reinforcing member 66 includes an annular ring part 66b coupled to the tip of the inner pin 31, and a cylindrical part 66c extending axially from the inner diameter surface of the annular part 66b to the motor part A. Since the load applied to some of the inner pins 31 from the curved plates 26a and 26b is supported by all the inner pins 31 via the annular portion 66b, the stress acting on the inner pins 31 is reduced and the durability is improved. Can be made. The tip of the cylindrical portion 66 c is drivingly coupled to the oil pump 51.

曲線板26bは、転がり軸受41によって偏心部材25bに対して回転自在に支持されている。この転がり軸受41は、その内径面が偏心部材25bの外径面に嵌合し、その外径面に外側軌道面を有する内輪部材42と、外側軌道面および貫通孔30bの孔壁面の間に配置される複数のころ44と、周方向で隣り合うころ44の間隔を保持する保持器(図示省略)とを備える円筒ころ軸受である。あるいは深溝玉軸受であってもよい。曲線板26aについても同様である。   The curved plate 26b is rotatably supported by the rolling bearing 41 with respect to the eccentric member 25b. The rolling bearing 41 has an inner diameter surface fitted to the outer diameter surface of the eccentric member 25b, and an inner ring member 42 having an outer raceway surface on the outer diameter surface, and the outer raceway surface and the hole wall surface of the through hole 30b. It is a cylindrical roller bearing provided with a plurality of rollers 44 to be arranged and a cage (not shown) that holds the interval between the rollers 44 adjacent in the circumferential direction. Alternatively, it may be a deep groove ball bearing. The same applies to the curved plate 26a.

外ピン27は、モータ側回転部材の回転軸線Oを中心とする円周軌道上に等間隔に設けられる。そして、曲線板26a,26bが公転運動すると、外周の曲線形状の波形と外ピン27とが係合して、曲線板26a,26bに自転運動を生じさせる。   The outer pins 27 are provided at equal intervals on a circumferential track around the rotation axis O of the motor side rotation member. Then, when the curved plates 26a, 26b revolve, the outer curved shape and the outer pin 27 engage with each other, causing the curved plates 26a, 26b to rotate.

なお、ケーシング22に配設された外ピン27は、減速部Bのケーシング22に直接保持されていてもよいが、好ましくはケーシング22の内壁に嵌合固定されている外ピン保持部45に保持されている。より具体的には、軸線方向両端部を外ピン保持部45に設けられた針状ころ軸受27aによって回転自在に支持されている。このように、外ピン27を外ピン保持部45に回転自在に取り付けることにより、曲線板26a,26bとの係合による接触抵抗を低減することができる。 インホイールモータ駆動装置21の軽量化の観点から、ケーシング22は、アルミ合金やマグネシウム合金等の軽金属で形成する。一方、高い強度が求められる外ピン保持部45は、炭素鋼で形成するのが望ましい。   The outer pin 27 disposed in the casing 22 may be directly held by the casing 22 of the speed reduction portion B, but is preferably held by the outer pin holding portion 45 fitted and fixed to the inner wall of the casing 22. Has been. More specifically, both end portions in the axial direction are rotatably supported by needle roller bearings 27 a provided on the outer pin holding portion 45. Thus, by attaching the outer pin 27 to the outer pin holding portion 45 so as to be rotatable, the contact resistance due to the engagement with the curved plates 26a, 26b can be reduced. From the viewpoint of reducing the weight of the in-wheel motor drive device 21, the casing 22 is formed of a light metal such as an aluminum alloy or a magnesium alloy. On the other hand, it is desirable to form the outer pin holding part 45, which requires high strength, from carbon steel.

車輪ハブ軸受部Cは、車輪側回転部材28に固定連結された車輪ハブ32と、車輪ハブ32を回転自在に保持する車輪ハブ軸受33と、車輪ハブ軸受33を支持する軸受部ケーシング22cとを備える。車輪ハブ軸受33は複列アンギュラ玉軸受であって、その外輪が軸受部ケーシング22cの内径面に嵌合固定され、その内輪が車輪ハブ32の外径面に嵌合固定される。車輪ハブ32は、円筒形状の中空部32aとフランジ部32bとを有する。フランジ部32bにはボルト32cによって図示しない駆動輪が固定連結される。   The wheel hub bearing portion C includes a wheel hub 32 fixedly connected to the wheel-side rotating member 28, a wheel hub bearing 33 that rotatably holds the wheel hub 32, and a bearing portion casing 22c that supports the wheel hub bearing 33. Prepare. The wheel hub bearing 33 is a double-row angular ball bearing, and its outer ring is fitted and fixed to the inner diameter surface of the bearing casing 22 c, and its inner ring is fitted and fixed to the outer diameter surface of the wheel hub 32. The wheel hub 32 has a cylindrical hollow portion 32a and a flange portion 32b. A driving wheel (not shown) is fixedly connected to the flange portion 32b by a bolt 32c.

上記構成のインホイールモータ駆動装置21の作動原理を詳しく説明する。   The operation principle of the in-wheel motor drive device 21 having the above configuration will be described in detail.

モータ部Aは、例えば、ステータ23のコイルに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、永久磁石または磁性体によって構成されるロータ24が回転する。   The motor unit A receives, for example, an electromagnetic force generated by supplying an alternating current to the coil of the stator 23, and the rotor 24 composed of a permanent magnet or a magnetic material rotates.

これにより、ロータ24に接続されたモータ出力軸35が回転すると、曲線板26a,26bはモータ側回転部材の回転軸線Oを中心として公転運動する。このとき、外ピン27が、曲線板26a,26bの曲線形状の波形と転がり接触するよう係合して、曲線板26a,26bをモータ側回転部材の回転とは逆向きに自転運動させる。   Accordingly, when the motor output shaft 35 connected to the rotor 24 rotates, the curved plates 26a and 26b revolve around the rotation axis O of the motor side rotation member. At this time, the outer pin 27 is engaged so as to be in rolling contact with the curved waveform of the curved plates 26a and 26b, thereby causing the curved plates 26a and 26b to rotate in the direction opposite to the rotation of the motor side rotating member.

貫通孔30aに挿通される内ピン31は、貫通孔30aの内径よりも十分に細く、曲線板26a,26bの自転運動に伴って貫通孔30aの孔壁面と当接する。これにより、曲線板26a,26bの公転運動が内ピン31に伝わらず、曲線板26a,26bの自転運動のみが車輪側回転部材28を介して車輪ハブ軸受部Cに伝達される。   The inner pin 31 inserted through the through hole 30a is sufficiently thinner than the inner diameter of the through hole 30a, and comes into contact with the hole wall surface of the through hole 30a as the curved plates 26a and 26b rotate. As a result, the revolving motion of the curved plates 26 a and 26 b is not transmitted to the inner pin 31, but only the rotational motion of the curved plates 26 a and 26 b is transmitted to the wheel hub bearing portion C via the wheel-side rotating member 28.

このとき、軸線Oと同軸に配置された車輪側回転部材28は、減速部Bの出力軸として曲線板26a,26bの自転を取り出し、減速部入力軸25の回転が減速部Bによって減速されて車輪側回転部材28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、駆動輪に必要なトルクを伝達することが可能となる。   At this time, the wheel-side rotating member 28 arranged coaxially with the axis O takes out the rotation of the curved plates 26a and 26b as the output shaft of the speed reduction part B, and the rotation of the speed reduction part input shaft 25 is decelerated by the speed reduction part B. Since it is transmitted to the wheel side rotation member 28, even when the low torque, high rotation type motor unit A is employed, it is possible to transmit the torque required for the drive wheels.

なお、上記構成の減速部Bの減速比は、外ピン27の数をZ、曲線板26a,26bの波形の数をZとすると、(Z−Z)/Zで算出される。図2に示す実施形態では、Z=12、Z=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 portion B having the above-described configuration is calculated as (Z A −Z B ) / Z B where Z A is the number of outer pins 27 and Z B is the number of waveforms of the curved plates 26a and 26b. 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21を得ることができる。また、外ピン27を外ピン保持部45に対して回転自在とし、内ピン31の曲線板26a,26bに当接する位置に針状ころ軸受31aを設けたことにより、摩擦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 speed reduction ratio without using a multi-stage configuration, the in-wheel motor drive device 21 having a compact and high speed reduction ratio can be obtained. Since the outer pin 27 is rotatable with respect to the outer pin holding portion 45 and the needle roller bearing 31a is provided at a position where the outer pin 27 comes into contact with the curved plates 26a and 26b of the inner pin 31, the frictional resistance is reduced. The transmission efficiency of the deceleration part B is improved.

本実施例に係るインホイールモータ駆動装置21を電気自動車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 21 according to this embodiment in an electric vehicle, the unsprung weight can be suppressed. As a result, an electric vehicle with excellent running stability can be obtained.

また、本実施例においては、減速部Bの曲線板26a,26b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。   In the present embodiment, two curved plates 26a and 26b of the speed reduction portion B are provided with 180 ° phase shifts. However, the number of the curved plates can be arbitrarily set. In the case of providing a sheet, it is preferable to change the phase by 120 °.

また、本実施例における運動変換機構は、車輪側回転部材28に固定された内ピン31と、曲線板26a,26bに設けられた貫通孔30a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32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、車輪側回転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 a present Example showed the example comprised by the inner pin 31 fixed to the wheel side rotation member 28, and the through-hole 30a provided in the curve boards 26a and 26b, Without limitation, any configuration capable of transmitting the rotation of the speed reduction unit B to the wheel hub 32 can be employed. 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 wheel side rotation member.

なお、本実施例における作動の説明は、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モータ部Aから駆動輪に伝達される。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 description of the operation in the present embodiment has been made by paying attention to the rotation of each member, but in reality, power including torque is transmitted from the motor unit A to the drive wheels. Therefore, the power decelerated as described above is converted into high torque.

また、本実施例における作動の説明では、モータ部Aに電力を供給してモータ部Aを駆動させ、モータ部Aからの動力を駆動輪に伝達させたが、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、駆動輪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モータ部Aに伝達し、モータ部A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、後でモータ部A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 description of the operation in the present embodiment, power is supplied to the motor unit A to drive the motor unit A, and the power from the motor unit A is transmitted to the drive wheels. When decelerating or going down a hill, the power from the driving wheel side may be converted into high-rotation and low-torque rotation by the deceleration unit B and transmitted to the motor unit A, and the motor unit A may generate power. . Furthermore, the electric power generated here may be stored in a battery and used later for driving the motor unit A or for operating other electric devices provided in the vehicle.

次に、図1に沿って、減速部Bの潤滑構造につき詳しく説明する。モータ部Aと減速部Bとの間に位置するポンプケーシング22pには、オイルポンプ51が設けられている。ポンプケーシング22pに設けられた吸入油路52は、オイルポンプ51の吸入口と減速部Bの下部に設けられたオイル溜まり53とを接続する。ポンプケーシング22pに設けられた吐出油路54は、一端でオイルポンプ51の吐出口と接続し、他端でモータケーシング22aに設けられた冷却油路55と接続する。冷却油路55は、モータケーシング22aに設けられたウォータージャケット61と交差する。ウォータージャケット61は冷却水入口61iと、冷却水入出口61oと、モータ部Aを周回するよう配設された通路61wを備える。冷却水入口61iから流入した冷却水は、通路61wを流れる過程でモータ部Aおよび冷却油路55を流れる潤滑油を冷却し、冷却水入出口61oから流出する。   Next, the lubricating structure of the speed reduction part B will be described in detail with reference to FIG. An oil pump 51 is provided in the pump casing 22p located between the motor part A and the speed reduction part B. The suction oil passage 52 provided in the pump casing 22p connects the suction port of the oil pump 51 and the oil reservoir 53 provided in the lower part of the speed reduction part B. The discharge oil passage 54 provided in the pump casing 22p is connected to the discharge port of the oil pump 51 at one end and is connected to the cooling oil passage 55 provided in the motor casing 22a at the other end. The cooling oil passage 55 intersects with a water jacket 61 provided in the motor casing 22a. The water jacket 61 includes a cooling water inlet 61i, a cooling water inlet / outlet 61o, and a passage 61w disposed around the motor portion A. The cooling water flowing in from the cooling water inlet 61i cools the lubricating oil flowing through the motor part A and the cooling oil passage 55 in the process of flowing through the passage 61w, and flows out from the cooling water inlet / outlet 61o.

冷却油路55の他端は、端部ケーシング22tに設けられた連絡油路56と接続する。連絡油路56は、管状のモータ出力軸35および減速部入力軸25の内部に設けられて軸線Oに沿って延びる軸線油路57と接続する。軸線油路57は、モータ部Aで、フィルタ部材67を内装され、減速部Bで、軸線Oから偏心部材25a内を径方向外側に向かって延びる潤滑油路58aと、軸線Oから偏心部材25b内を径方向外側に向かって延びる潤滑油路58bとに分岐する。潤滑油路58a,58bの径方向外側端は、転がり軸受41の内輪部材42を貫通するよう外周軌道面42aに設けられた孔43と接続する。   The other end of the cooling oil passage 55 is connected to a communication oil passage 56 provided in the end casing 22t. The communication oil passage 56 is provided inside the tubular motor output shaft 35 and the speed reduction unit input shaft 25 and is connected to an axial oil passage 57 extending along the axis O. The axial oil passage 57 includes a motor part A and a filter member 67. The reduction oil part B includes a lubricating oil path 58a extending radially outward from the axis O in the eccentric member 25a, and an eccentric member 25b extending from the axis O. The inside branches into a lubricating oil passage 58b extending radially outward. The radially outer ends of the lubricating oil passages 58 a and 58 b are connected to a hole 43 provided in the outer raceway surface 42 a so as to penetrate the inner ring member 42 of the rolling bearing 41.

補強部材66の円筒部66cによって駆動されるオイルポンプ51は、例えばサイクロイドポンプで構成され、オイル溜まり53に貯留した潤滑油を吸入油路52で吸入し、吐出油路54に潤滑油を吐出する。潤滑油は、吐出油路54と冷却油路55とを順次通過して冷却される。次に潤滑油は、連絡油路56と、軸線油路57とを順次通過し、軸線油路57に内装されたフィルタ部材67によって濾過される。濾過によって不純物を取り除かれた潤滑油は、減速部Bで潤滑油路58a、58bにそれぞれ分岐して径方向外方へ流れ、偏心部材25aに設けられた転がり軸受41と、偏心部材25bに設けられた転がり軸受41とをそれぞれ潤滑する。また、潤滑油は遠心力の作用によって径方向外方へ流れるため、曲線板26a、26bと、外ピン27とをそれぞれ潤滑する。その後、潤滑油は落下して、減速部Bの下部に設けられたオイル溜まり53に貯留する。潤滑油の循環経路は以上のように構成される。   The oil pump 51 driven by the cylindrical portion 66c of the reinforcing member 66 is constituted by a cycloid pump, for example. The oil pump 51 sucks the lubricating oil stored in the oil reservoir 53 through the suction oil passage 52 and discharges the lubricating oil into the discharge oil passage 54. . The lubricating oil sequentially passes through the discharge oil passage 54 and the cooling oil passage 55 and is cooled. Next, the lubricating oil sequentially passes through the communication oil passage 56 and the axial oil passage 57 and is filtered by the filter member 67 built in the axial oil passage 57. The lubricating oil from which impurities have been removed by filtration branches into the lubricating oil passages 58a and 58b in the speed reduction portion B and flows radially outward, and is provided in the rolling bearing 41 provided in the eccentric member 25a and the eccentric member 25b. Each of the produced rolling bearings 41 is lubricated. Further, since the lubricating oil flows radially outward by the action of centrifugal force, the curved plates 26a and 26b and the outer pin 27 are lubricated. Thereafter, the lubricating oil falls and is stored in an oil reservoir 53 provided at the lower portion of the speed reduction portion B. The lubricating oil circulation path is configured as described above.

図3は、フィルタ部材67の縦断面図である。フィルタ部材67は円筒形状を有し、内周67i側が不純物を含む潤滑油を受け入れ、外周側から濾過された潤滑油が流出する。フィルタ部材67は濾紙製、ガラス製、金属製等、材質は問わない。金属製の場合、好ましくは、磁化された金属製で構成されるのがよい。これにより、摩耗粉などの金属の不純物を捕捉することができる。   FIG. 3 is a longitudinal sectional view of the filter member 67. The filter member 67 has a cylindrical shape, the inner periphery 67i side receives lubricating oil containing impurities, and the filtered lubricating oil flows out from the outer peripheral side. The filter member 67 may be made of any material such as filter paper, glass, or metal. When made of metal, it is preferably made of magnetized metal. Thereby, metal impurities, such as abrasion powder, can be captured.

フィルタ部材67の軸線方向基端には雄ねじ部68が固定されている。雄ねじ部68の中心には、フィルタ部材67の内周67iに包囲された内空領域と接続する貫通孔68hが設けられている。また、フィルタ部材67の軸線方向先端には案内部69が固定されている。案内部69はでフィルタ部材67の内周67iに包囲された内空領域の軸線方向先端を封止する。   A male screw portion 68 is fixed to the base end in the axial direction of the filter member 67. In the center of the male screw portion 68, a through hole 68h connected to the inner space region surrounded by the inner periphery 67i of the filter member 67 is provided. A guide portion 69 is fixed to the tip end of the filter member 67 in the axial direction. The guide portion 69 seals the tip in the axial direction of the inner space region surrounded by the inner periphery 67 i of the filter member 67.

図4は案内部69を軸線方向からみた背面図である。案内部69の外周には、支持突起71が周方向等間隔に4箇所設けられている。支持突起71は外径方向に突出し、支持突起71の4箇所すべての先端が共通する円弧を形成する。図1に示すようにフィルタ部材67が軸線油路57に内装された状態で、支持突起71は軸線油路57の壁面と接触することから、フィルタ部材67の外周面が軸線油路57の壁面から離れて位置する。隣り合う支持突起71,71間に位置する空間は、フィルタ部材67の外周面と、減速部入力軸25の軸線油路25とを連通する。   FIG. 4 is a rear view of the guide portion 69 as seen from the axial direction. Four support protrusions 71 are provided on the outer periphery of the guide portion 69 at equal intervals in the circumferential direction. The support protrusion 71 protrudes in the outer diameter direction, and forms a circular arc in which all four tips of the support protrusion 71 are common. As shown in FIG. 1, the support protrusion 71 is in contact with the wall surface of the axial oil passage 57 in a state where the filter member 67 is housed in the axial oil passage 57, so that the outer peripheral surface of the filter member 67 is the wall surface of the axial oil passage 57. Located away from. A space located between the adjacent support protrusions 71 and 71 communicates the outer peripheral surface of the filter member 67 and the axial oil passage 25 of the speed reduction portion input shaft 25.

モータ出力軸35の端部ケーシング22t側の端部には、軸線油路57の内部に雌ねじ70が刻設されており、雄ねじ部68を雌ねじ70に螺合させてフィルタ部材67が軸線油路57に内装固定される。   A female screw 70 is engraved inside the axial oil passage 57 at the end of the motor output shaft 35 on the end casing 22t side, and the male screw portion 68 is screwed into the female screw 70 so that the filter member 67 is connected to the axial oil passage. The interior is fixed to 57.

なお、フィルタ部材67を軸線油路57に固定するに際しては、フィルタ部材67をモータ出力軸35の前進回転方向と逆方向に回転させて螺合させる。これに対し、フィルタ部材67を軸線油路57から取り外すに際しては、フィルタ部材67をモータ出力軸35の前進回転方向と同じ方向に回転させて螺合を解除する。   When the filter member 67 is fixed to the axial oil passage 57, the filter member 67 is rotated and screwed in the direction opposite to the forward rotation direction of the motor output shaft 35. On the other hand, when removing the filter member 67 from the axial oil passage 57, the filter member 67 is rotated in the same direction as the forward rotation direction of the motor output shaft 35 to release the screwing.

案内部69を介して軸線油路57の内壁から離れた位置で支持されたフィルタ部材67の内周67iに位置する内周面は、外部の連絡油路56から貫通孔68hを経て潤滑油を受け入れる。受け入れられた潤滑油はフィルタ部材67を外径方向に浸透して、フィルタ部材67の内周面から外周面へ移動し、濾過される。フィルタ部材67の外周面と軸線油路57の内壁との隙間は、濾過された潤滑油を減速部Bへ供給する。このためフィルタ部材67の内周67iには、濾過によって捕捉された潤滑油の不純物が付着する。   The inner peripheral surface located on the inner periphery 67i of the filter member 67 supported at a position away from the inner wall of the axial oil passage 57 via the guide portion 69 is supplied with lubricating oil from the external communication oil passage 56 through the through hole 68h. accept. The received lubricating oil penetrates the filter member 67 in the outer diameter direction, moves from the inner peripheral surface of the filter member 67 to the outer peripheral surface, and is filtered. A gap between the outer peripheral surface of the filter member 67 and the inner wall of the axial oil passage 57 supplies the filtered lubricating oil to the speed reduction unit B. For this reason, the impurities of the lubricating oil captured by filtration adhere to the inner periphery 67i of the filter member 67.

図5は、フィルタ部材67を図3のV−Vで断面とし、軸線方向からみた状態を示す横断面図である。フィルタ部材67は濾過効率を高めるために多角の星形に形成されている。なお、フィルタ部材67の円筒形状は、横断面が円筒である他、星形や多角形等、仮想の内接円および外接円が円であるものも含む。   FIG. 5 is a cross-sectional view of the filter member 67 taken along line V-V in FIG. 3 and viewed from the axial direction. The filter member 67 is formed in a polygonal star shape in order to increase the filtration efficiency. The cylindrical shape of the filter member 67 includes a cylinder whose cross section is a cylinder, and a virtual inscribed circle and a circumscribed circle such as a star shape and a polygon shape are circles.

次に本発明の変形例を説明する。図6は本発明の変形例を示す縦断面図である。この変形例につき、上述した実施例と共通する構成については同一の符号を付して説明を省略し、異なる構成について以下に説明する。この変形例では図6に示すように、端面ケーシング22tの中心に貫通孔72と、貫通孔72を閉塞する蓋73を設ける。貫通孔72は、モータ出力軸35と同軸に形成される。蓋73は端部ケーシング22tに外側からねじ固定され、フィルタ部材67の基端と対向する。この変形例によれば、フィルタ部材67を交換する際、蓋73を取り外して容易に作業することができる。   Next, a modification of the present invention will be described. FIG. 6 is a longitudinal sectional view showing a modification of the present invention. With respect to this modification, the same reference numerals are given to the configurations common to the above-described embodiments, and the description thereof will be omitted, and different configurations will be described below. In this modification, as shown in FIG. 6, a through hole 72 and a lid 73 for closing the through hole 72 are provided at the center of the end surface casing 22t. The through hole 72 is formed coaxially with the motor output shaft 35. The lid 73 is screwed to the end casing 22t from the outside and faces the base end of the filter member 67. According to this modification, when replacing the filter member 67, the lid 73 can be removed and the operation can be easily performed.

フィルタ部材67は、雄ねじ部68と案内部69との間に、案内リブ74をさらに備えていてもよい。図7は、変形例のフィルタ部材67の側面図である。フィルタ部材67の外周は、樹脂製のフィルタカバー75で包囲され、フィルタカバー75の内周には、濾紙からなるフィルタ材料が図5に示す円筒形状の態様で設けられている。フィルタカバー75の外周には、案内リブ74が周方向および軸線方向に間隔を開けて複数形成される。案内リブ74は、外径方向に突出した形状であり、軸線油路57の内壁と接触して、フィルタ部材の外周面を軸線油路57の内壁から離隔する。なお、フィルタカバー75には多数の孔76が配置され、潤滑油が孔76から外径方向へ流出することができる。   The filter member 67 may further include a guide rib 74 between the male screw portion 68 and the guide portion 69. FIG. 7 is a side view of a filter member 67 according to a modification. The outer periphery of the filter member 67 is surrounded by a resin filter cover 75, and a filter material made of filter paper is provided on the inner periphery of the filter cover 75 in a cylindrical shape shown in FIG. A plurality of guide ribs 74 are formed on the outer periphery of the filter cover 75 at intervals in the circumferential direction and the axial direction. The guide rib 74 has a shape protruding in the outer diameter direction, contacts the inner wall of the axial oil passage 57, and separates the outer peripheral surface of the filter member from the inner wall of the axial oil passage 57. A large number of holes 76 are arranged in the filter cover 75, and the lubricating oil can flow out from the holes 76 in the outer diameter direction.

次に本発明の他の実施例のフィルタ部材を、図8の側面図に基づき説明する。フィルタ部材67は、メッシュ形状の金属製である。好ましくは鉄系、コバルト系の金属のような磁化可能な金属で形成され、磁気を帯びている。これにより、鉄粉などの不純物を容易に吸着して、潤滑油を濾過する。フィルタ部材67は軸線方向中間部で案内リブ74を周方向4箇所備える。   Next, the filter member of the other Example of this invention is demonstrated based on the side view of FIG. The filter member 67 is made of mesh-shaped metal. Preferably, it is made of a magnetizable metal such as an iron-based or cobalt-based metal and is magnetic. Thereby, impurities, such as iron powder, are easily adsorbed and the lubricating oil is filtered. The filter member 67 includes guide ribs 74 at four locations in the circumferential direction in the middle portion in the axial direction.

ところで上述した実施例によれば、モータ側回転部材になるモータ出力軸35が、潤滑油を減速部Bに供給する軸線油路57と、この軸線油路57に内装されて潤滑油を濾過するフィルタ部材67とを有することから、フィルタ部材67をインホイールモータ駆動装置21の内部に取り付けることが可能になり、取付スペースの問題が解消する。この結果、インホイールモータ駆動装置の小型化という強い要求を満足させることができる。   By the way, according to the above-described embodiment, the motor output shaft 35 serving as the motor-side rotating member is installed in the axial oil passage 57 for supplying the lubricating oil to the speed reduction unit B, and is filtered in the axial oil passage 57. Since it has the filter member 67, it becomes possible to attach the filter member 67 inside the in-wheel motor drive device 21, and the problem of an installation space is eliminated. As a result, a strong demand for downsizing the in-wheel motor drive device can be satisfied.

また本実施例によれば、モータ回転部材は、モータ部Aの内部に回転自在に設けられたモータ出力軸35と、減速部Bの内部に回転自在に設けられて、モータ出力軸35の一方端部と結合する減速部入力軸25とを含み、フィルタ部材67はモータ出力軸35に設けられた軸線油路57に内装されることから、減速部Bの外にフィルタ部材67を取り付けることが可能になり、モータ部Aからフィルタ部材67を交換することが可能になる。したがって、メンテナンス効率が向上する。   In addition, according to the present embodiment, the motor rotating member is provided so that one of the motor output shaft 35 and the motor output shaft 35 provided rotatably inside the motor portion A and the motor output shaft 35 provided rotatably inside the speed reduction portion B are provided. Since the filter member 67 is included in the axial oil passage 57 provided on the motor output shaft 35, the filter member 67 can be attached outside the speed reduction portion B. It becomes possible, and it becomes possible to replace the filter member 67 from the motor part A. Accordingly, maintenance efficiency is improved.

また本実施例によれば、フィルタ部材67の雄ねじ部68が減速部入力軸25から遠い側にあるモータ出力軸35の他方端部と螺合することから、モータ部Aの外方からフィルタ部材67を容易に交換することができる。   Further, according to this embodiment, the male screw portion 68 of the filter member 67 is screwed with the other end portion of the motor output shaft 35 on the side far from the speed reduction portion input shaft 25, so that the filter member is formed from the outside of the motor portion A. 67 can be easily replaced.

また本実施例によれば、フィルタ部材67はモータ出力軸35の前進回転方向と逆方向に回転してモータ出力軸35の他方端部と螺合することから、モータ出力軸35の前進回転中に螺合が緩むことを防止することができる。   Further, according to this embodiment, the filter member 67 rotates in the direction opposite to the forward rotation direction of the motor output shaft 35 and is screwed with the other end portion of the motor output shaft 35, so that the motor output shaft 35 is rotating forward. Can be prevented from loosening.

また本実施例によれば、モータ部Aはモータ部の外郭を形成するモータケーシング22を有し、モータケーシング22はモータ出力軸35の他方端部と対面する位置に蓋73を備えることから、蓋73を開閉することにより、フィルタ部材67を交換することが可能になる。したがって、メンテナンス効率が向上する。   Further, according to the present embodiment, the motor part A has the motor casing 22 that forms the outline of the motor part, and the motor casing 22 includes the lid 73 at a position facing the other end of the motor output shaft 35. The filter member 67 can be exchanged by opening and closing the lid 73. Accordingly, maintenance efficiency is improved.

また本実施例によれば、フィルタ部材67はモータ側回転部材の軸線Oと同軸に固定された円筒形状を有することから、モータ側回転部材の回転時の遠心力を利用して、潤滑油をフィルタ部材に半径方向外方へ通じさせることが可能になり、潤滑油を円滑に流すことができる。   Further, according to the present embodiment, the filter member 67 has a cylindrical shape fixed coaxially with the axis O of the motor-side rotating member, so that the lubricating oil is applied by utilizing the centrifugal force during the rotation of the motor-side rotating member. It is possible to allow the filter member to communicate outward in the radial direction, and the lubricating oil can flow smoothly.

また本実施例によれば、軸線油路57がモータ側回転部材に沿って延在し、フィルタ部材67は案内部69や案内リブ74を介して軸線油路57の内壁から離れた位置で支持され、フィルタ部材67の内周67iが、外部の連絡油路56から潤滑油を受け入れ、フィルタ部材67の外周と軸線油路57の内壁との隙間が、減速部Bへ潤滑油を供給することから、フィルタ部材67がモータ出力軸35とともに高速回転しても、遠心力でフィルタ部材67が変位ないし変形する虞を回避することができる。また、フィルタ部材の内周67iで不純物を捕捉することが可能になり、フィルタ部材の交換とともに不純物を油路から除去することができる。   Further, according to this embodiment, the axial oil passage 57 extends along the motor-side rotating member, and the filter member 67 is supported at a position away from the inner wall of the axial oil passage 57 via the guide portion 69 and the guide rib 74. The inner periphery 67i of the filter member 67 receives the lubricating oil from the external communication oil passage 56, and the gap between the outer periphery of the filter member 67 and the inner wall of the axial oil passage 57 supplies the lubricating oil to the speed reduction unit B. Therefore, even if the filter member 67 rotates at a high speed together with the motor output shaft 35, it is possible to avoid the possibility that the filter member 67 is displaced or deformed by centrifugal force. Moreover, it becomes possible to capture | acquire an impurity with the inner periphery 67i of a filter member, and an impurity can be removed from an oil path with replacement | exchange of a filter member.

また本実施例によれば、図8に示すフィルタ部材67は、磁化された金属製である。これにより、金属の不純物を容易に捕捉することができる。また、フィルタ部材67の強度が大きくなり、高速回転時の遠心力に対する信頼性が向上する。   Further, according to this embodiment, the filter member 67 shown in FIG. 8 is made of magnetized metal. Thereby, metal impurities can be easily captured. Further, the strength of the filter member 67 is increased, and the reliability with respect to the centrifugal force during high-speed rotation is improved.

また本実施例によれば、図7に示すように、案内部としての案内リブ74はフィルタ部材67の外郭を形成するフィルタカバー75と一体結合し、これら案内リブ74およびフィルタカバー75は樹脂製であってもよい。これにより、フィルタカバー75を射出成形によって容易に製作することが可能となり、コスト上有利である。あるいは、これら案内リブ74およびフィルタカバー75は軽金属製であってもよい。これにより、フィルタ部材67の強度が大きくなり、高速回転時の遠心力に対する信頼性が向上する。   Further, according to the present embodiment, as shown in FIG. 7, the guide rib 74 as the guide portion is integrally coupled with the filter cover 75 that forms the outline of the filter member 67, and the guide rib 74 and the filter cover 75 are made of resin. It may be. Accordingly, the filter cover 75 can be easily manufactured by injection molding, which is advantageous in terms of cost. Alternatively, the guide rib 74 and the filter cover 75 may be made of light metal. This increases the strength of the filter member 67 and improves the reliability against centrifugal force during high-speed rotation.

また本実施例によれば、潤滑油を吐出するオイルポンプ51をさらに備え、潤滑油の循環経路が、オイルポンプ51から、軸線油路57と、フィルタ部材67と、減速部Bとを順次流れるよう構成されることから、フィルタ部材67を経由した清浄な潤滑油で減速部Bを潤滑することができる。なお、減速部Bを潤滑後、潤滑油は油溜まり53に集められ、次にオイルポンプ51へ戻されてもよいし、他の部材を潤滑した後に油溜まり53に集められてもよい。また、潤滑油の循環経路の一部をウォータージャケット61内に配設して、潤滑油を冷却してもよい。   In addition, according to the present embodiment, the oil pump 51 that discharges the lubricating oil is further provided, and the circulation path of the lubricating oil sequentially flows from the oil pump 51 through the axial oil passage 57, the filter member 67, and the speed reducing portion B. Therefore, the speed reduction unit B can be lubricated with clean lubricating oil that has passed through the filter member 67. The lubricating oil may be collected in the oil reservoir 53 and then returned to the oil pump 51 after lubricating the speed reducing portion B, or may be collected in the oil reservoir 53 after lubricating other members. Also, a part of the lubricating oil circulation path may be disposed in the water jacket 61 to cool the lubricating oil.

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.

本発明の実施例になるインホイールモータ駆動装置を示す縦断面図である。It is a longitudinal cross-sectional view which shows the in-wheel motor drive device which becomes an Example of this invention. 図1のII−IIにおける減速部の断面図である。It is sectional drawing of the deceleration part in II-II of FIG. 同実施例のフィルタ部材を示す縦断面図である。It is a longitudinal cross-sectional view which shows the filter member of the Example. 同実施例の案内部を軸線方向からみた背面図である。It is the rear view which looked at the guide part of the Example from the axial direction. 図3のV−Vで断面とし、軸線方向からみた状態を示すフィルタ部材の横断面図である。FIG. 5 is a cross-sectional view of the filter member showing a state viewed from the axial direction taken along the line VV of FIG. 3. 本発明の変形例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the modification of this invention. 変形例のフィルタ部材の側面図である。It is a side view of the filter member of a modification. 他の実施例のフィルタ部材の側面図である。It is a side view of the filter member of another Example.

符号の説明Explanation of symbols

21 インホイールモータ駆動装置、22 ケーシング、22a モータケーシング、22b 減速部ケーシング、22c 軸受部ケーシング、22p ポンプケーシング、22t 端部ケーシング、23 ステータ、24 ロータ、25 減速部入力軸、25a,25b 偏心部材、26a,26b 曲線板、27 外ピン、28 車輪側回転部材、31 内ピン、32 車輪ハブ、33 車輪ハブ軸受、35 モータ出力軸、41 転がり軸受、42 内輪部材、42a 外周軌道面、43 孔、44 ころ、51 オイルポンプ、52 吸入油路、53 オイル溜まり、54 吐出油路、55 冷却油路、56 連絡油路、57 軸線油路、58a,58b 潤滑油路、61 ウォータージャケット、62,63,64 軸受、66 補強部材、67 フィルタ部材、68 雄ねじ部、68h 貫通孔、69 案内部、70 雌ねじ、71 支持突起、72 貫通孔、73 蓋、74 案内リブ、75 フィルタカバー、76 孔。   21 in-wheel motor drive device, 22 casing, 22a motor casing, 22b reduction gear casing, 22c bearing casing, 22p pump casing, 22t end casing, 23 stator, 24 rotor, 25 reduction gear input shaft, 25a, 25b eccentric member 26a, 26b Curved plate, 27 Outer pin, 28 Wheel side rotating member, 31 Inner pin, 32 Wheel hub, 33 Wheel hub bearing, 35 Motor output shaft, 41 Rolling bearing, 42 Inner ring member, 42a Outer raceway surface, 43 holes , 44 roller, 51 oil pump, 52 suction oil passage, 53 oil pool, 54 discharge oil passage, 55 cooling oil passage, 56 communication oil passage, 57 axis oil passage, 58a, 58b lubricating oil passage, 61 water jacket, 62, 63, 64 Bearing, 66 Reinforcement member, 67 Filter Member, 68 Male thread part, 68h Through hole, 69 Guide part, 70 Female thread, 71 Support protrusion, 72 Through hole, 73 Lid, 74 Guide rib, 75 Filter cover, 76 hole.

Claims (11)

  1. モータ側回転部材を回転駆動するモータ部と、前記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、
    前記減速部は、前記モータ側回転部材の軸線から偏心してモータ側回転部材の一端に結合した円盤形状の偏心部材と、
    内周が前記偏心部材の外周に相対回転可能に取り付けられ、前記モータ側回転部材の回転に伴って前記軸線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前記公転部材の自転運動を生じさせる外周係合部材と、
    前記車輪側回転部材と結合し、前記公転部材の自転運動を取り出す内側係合部材とを有し、
    前記モータ側回転部材は、潤滑油を前記減速部に供給する油路と、該油路に内装されて潤滑油を濾過するフィルタ部材とを有する、インホイールモータ駆動装置。
    A motor unit that rotationally drives the motor side rotating member, a speed reducing unit that decelerates the rotation of the motor side rotating member and transmits the rotation to the wheel side rotating member, and a wheel hub fixedly connected to the wheel side rotating member,
    The speed reduction portion is a disc-shaped eccentric member that is eccentric from the axis of the motor-side rotating member and is coupled to one end of the motor-side rotating member;
    A revolving member that has an inner periphery attached to the outer periphery of the eccentric member so as to be relatively rotatable, and performs a revolving motion about the axis along with the rotation of the motor side rotating member;
    An outer periphery engaging member that engages with an outer peripheral portion of the revolving member to cause rotation of the revolving member;
    An inner engagement member that is coupled to the wheel-side rotation member and extracts the rotation of the revolution member;
    The motor-side rotating member includes an oil passage that supplies lubricating oil to the speed reduction unit, and a filter member that is built in the oil passage and filters the lubricating oil.
  2. 前記モータ側回転部材は、前記モータ部の内部に回転自在に設けられたモータ出力軸と、前記減速部の内部に回転自在に設けられて、前記モータ出力軸の一方端部と結合する減速部入力軸とを含み、
    前記フィルタ部材はモータ出力軸に設けられたモータ出力軸油路に内装される、請求項1に記載のインホイールモータ駆動装置。
    The motor-side rotation member includes a motor output shaft that is rotatably provided in the motor portion, and a speed reduction portion that is rotatably provided in the speed reduction portion and is coupled to one end portion of the motor output shaft. Including an input shaft,
    The in-wheel motor drive device according to claim 1, wherein the filter member is built in a motor output shaft oil passage provided on the motor output shaft.
  3. 前記フィルタ部材は、前記減速部入力軸から遠い側にあるモータ出力軸の他方端部と螺合する、請求項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 2, wherein the filter member is screwed with the other end portion of the motor output shaft on the side far from the input shaft of the speed reduction unit.
  4. 前記フィルタ部材は前記モータ出力軸の前進回転方向と逆方向に回転してモータ出力軸の他方端部と螺合する、請求項3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 3, wherein the filter member rotates in a direction opposite to the forward rotation direction of the motor output shaft and is screwed with the other end portion of the motor output shaft.
  5. 前記モータ部はモータ部の外郭を形成するモータケーシングを有し、
    前記モータケーシングは前記モータ出力軸の他方端部と対面する位置に蓋部を備える、請求項3または4に記載のインホイールモータ駆動装置。
    The motor unit has a motor casing that forms an outer shell of the motor unit;
    The in-wheel motor drive device according to claim 3 or 4, wherein the motor casing includes a lid at a position facing the other end of the motor output shaft.
  6. 前記フィルタ部材は前記モータ側回転部材と同軸に固定された円筒形状を有する、請求項1〜5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 5, wherein the filter member has a cylindrical shape fixed coaxially with the motor-side rotation member.
  7. 前記油路は前記モータ側回転部材に沿って延在し、
    前記フィルタ部材は案内部を介して前記油路の内壁から離れた位置で支持され、
    フィルタ部材の内周が、外部から潤滑油を受け入れ、
    フィルタ部材の外周と油路の内壁との隙間が、前記減速部へ潤滑油を供給する、請求項6に記載のインホイールモータ駆動装置。
    The oil passage extends along the motor-side rotating member,
    The filter member is supported at a position away from the inner wall of the oil passage through a guide portion,
    The inner circumference of the filter member accepts lubricating oil from the outside,
    The in-wheel motor drive device of Claim 6 with which the clearance gap between the outer periphery of a filter member and the inner wall of an oil path supplies lubricating oil to the said deceleration part.
  8. 前記フィルタ部材は、磁化された金属製である、請求項1〜7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 claim 1, wherein the filter member is made of magnetized metal.
  9. 前記案内部は、前記フィルタ部材の外郭を形成するフィルタカバーと一体結合し、これら案内部およびフィルタカバーは樹脂製である、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 guide part is integrally coupled to a filter cover that forms an outline of the filter member, and the guide part and the filter cover are made of resin.
  10. 前記案内部は前記フィルタ部材の外郭を形成するフィルタカバーと一体結合し、これら案内部およびフィルタカバーは軽金属製である、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 guide portion is integrally coupled to a filter cover that forms an outline of the filter member, and the guide portion and the filter cover are made of light metal.
  11. 潤滑油を吐出するポンプをさらに備え、
    潤滑油の循環経路が、前記ポンプから、前記油路と、前記フィルタ部材と、前記減速部とを順次流れるよう構成される、請求項1〜10のいずれかに記載のインホイールモータ駆動装置。
    A pump for discharging the lubricating oil;
    The in-wheel motor drive device in any one of Claims 1-10 comprised so that the circulation path of lubricating oil may flow sequentially through the said oil path, the said filter member, and the said deceleration part from the said pump.
JP2008295550A 2008-11-19 2008-11-19 In-wheel motor driving device Withdrawn JP2010121701A (en)

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