JP2011135722A - Electrolytic-corrosion preventing unit for wheel driving device, and wheel driving device - Google Patents

Electrolytic-corrosion preventing unit for wheel driving device, and wheel driving device Download PDF

Info

Publication number
JP2011135722A
JP2011135722A JP2009294087A JP2009294087A JP2011135722A JP 2011135722 A JP2011135722 A JP 2011135722A JP 2009294087 A JP2009294087 A JP 2009294087A JP 2009294087 A JP2009294087 A JP 2009294087A JP 2011135722 A JP2011135722 A JP 2011135722A
Authority
JP
Japan
Prior art keywords
contact body
rotor
motor
contact
corrosion prevention
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2009294087A
Other languages
Japanese (ja)
Other versions
JP5402619B2 (en
Inventor
Yasuyuki Matsuda
靖之 松田
Gen Kimura
玄 木村
Daisuke Gunji
大輔 郡司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP2009294087A priority Critical patent/JP5402619B2/en
Publication of JP2011135722A publication Critical patent/JP2011135722A/en
Application granted granted Critical
Publication of JP5402619B2 publication Critical patent/JP5402619B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2205/00—Specific aspects not provided for in the other groups of this subclass relating to casings, enclosures, supports
    • H02K2205/03—Machines characterised by thrust bearings

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the production costs of members used as electrolytic-corrosion countermeasures while solving the problem of electrolytic corrosion of a bearing supporting a rotor of a vehicle drive device. <P>SOLUTION: An electrolytic-corrosion preventing unit includes a contact body which allows electrical conduction with a motor rotor and whose tip partially or wholly has a conical or spherical surface, an elastic body for pressing the contact body to the rotor side, a storage part that stores the contact body and the elastic body, and is accommodated in a motor casing and made electrically conductive with a stator via the motor casing, and a conductive member that has a hollow cylindrical shape with one end fixed to the rotor shaft end and the other end contactable with the tip of the contact body. The contact body, the elastic body, and the storage part are made of a conductive material. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、車輪を駆動する装置における転がり軸受部の電食を防止するためのユニットであって、特に、インナーロータ型のモータを駆動源とする車輪駆動装置における転がり軸受部の電食を防止するためのユニット及びそれを用いたインナーロータ型のモータを備える車輪駆動装置に関するものである。 The present invention is a unit for preventing electric corrosion of a rolling bearing portion in a device for driving a wheel, and particularly for preventing electric corrosion of a rolling bearing portion in a wheel driving device using an inner rotor type motor as a drive source. The present invention relates to a wheel drive device including a unit for carrying out and an inner rotor type motor using the unit.

近年、車輪の内側若しくは近傍に駆動源としての電動モータを配置して車輪を駆動するタイプの車両の実用化が進みつつある。このような駆動用モータは一般にインホイールモータと呼ばれている。一般的なインホイールモータの構造の一例が特許文献１に開示されている。その構造は、モータ筐体にステータ（固定子）が固定され、ステータの内径側に半径方向に隙間をあけてロータ（回転子）が配置されており、いわゆるインナーロータ型モータとなっている。また、インホイールモータの駆動方式としては、モータの性能や制御性能を考慮し、インバータによって駆動するブラシレスＤＣモータが多く利用されている。 In recent years, vehicles of a type in which an electric motor as a drive source is disposed inside or in the vicinity of a wheel to drive the wheel are being put into practical use. Such a drive motor is generally called an in-wheel motor. An example of the structure of a general in-wheel motor is disclosed in Patent Document 1. In this structure, a stator (stator) is fixed to a motor housing, and a rotor (rotor) is disposed on the inner diameter side of the stator with a gap in the radial direction, which is a so-called inner rotor type motor. As a driving method for the in-wheel motor, a brushless DC motor driven by an inverter is often used in consideration of motor performance and control performance.

インバータによって駆動する方式では、ステータとロータの間の寄生容量等によってステータとロータ間に電位差が生じる。この電位差により、いわゆる軸電圧・軸電流が発生し、この軸電流がロータを支持している転がり軸受を通過すると、転がり軸受に損傷を与える場合がある。すなわち、一般的に「電食」と呼ばれる現象が生じる。具体的には、転がり軸受の外輪・内輪の転走面と転動体の接触部に局部的に電流が流れ、軌道面もしくは転動面が融解等して凹凸を生じ、これにより軸受の転走面や転動体表面が荒れてしまうので、騒音や振動の原因となるばかりでなく、過度の電食が発生すると軸受の寿命にも影響がある。 In the system driven by an inverter, a potential difference is generated between the stator and the rotor due to parasitic capacitance between the stator and the rotor. Due to this potential difference, so-called shaft voltage / shaft current is generated, and when this shaft current passes through the rolling bearing supporting the rotor, the rolling bearing may be damaged. That is, a phenomenon generally called “electric corrosion” occurs. Specifically, a current flows locally at the contact surface between the rolling surface of the outer and inner rings of the rolling bearing and the rolling element, and the raceway surface or rolling surface is melted to create irregularities, which causes the rolling of the bearing. Since the surface and the rolling element surface are roughened, it not only causes noise and vibration, but also excessive galvanic corrosion affects the bearing life.

転がり軸受部の電食を防止する目的の先行技術としては、特許文献２等に開示されている技術がある。これらは、軸受の外輪、内輪、転動体のいずれかを絶縁体で形成して軸受を絶縁する方法を開示している。 As a prior art for the purpose of preventing electric corrosion of the rolling bearing portion, there is a technology disclosed in Patent Document 2 and the like. These disclose a method of insulating a bearing by forming an outer ring, an inner ring, or a rolling element of the bearing with an insulator.

特開２００５−８１８７１号公報JP 2005-81871 A 特開２００７−１６８４６号公報JP 2007-16846 A

しかし、転がり軸受の構成要素である外輪、内輪、転動体に適用できる絶縁体、絶縁材料として、現実的に使用できる材料は樹脂もしくはセラミックに限定されてしまう。樹脂では転がり軸受に基本的に求められる強度が、金属材料によるものに比べて劣ってしまう。またセラミックは高価であるという問題がある。 However, the material that can be practically used as the insulator and insulating material that can be applied to the outer ring, inner ring, and rolling element, which are components of the rolling bearing, is limited to resin or ceramic. With resin, the strength required for a rolling bearing is inferior to that of a metal material. In addition, there is a problem that ceramic is expensive.

そこで、本発明は、転がり軸受には特段の変更が必要なく通常のものが使用される態様においても、軸電圧・軸電流による転がり軸受の電食の発生を簡便な手段で効果的に防止できる車輪駆動装置の電食防止ユニットを提供することを課題とする。併せて、当該電食防止ユニットを備え転がり軸受の電食の発生が防止された車輪駆動装置を提供することを目的とする。 Therefore, the present invention can effectively prevent the occurrence of electrolytic corrosion of the rolling bearing due to the shaft voltage / shaft current even in an aspect where a rolling bearing does not require any particular change and is used normally. It is an object of the present invention to provide an electrolytic corrosion prevention unit for a wheel drive device. In addition, an object of the present invention is to provide a wheel drive device that includes the electrolytic corrosion prevention unit and prevents the occurrence of electrolytic corrosion of a rolling bearing.

本発明の第一の発明は、車輪駆動装置用電食防止ユニットであり、モータのロータと電気的に導通させるための接触体であって、その先端部の少なくとも一部が、円形の断面形状を有する円錐面もしくは球面であるものと、接触体をロータ側へ押圧するための弾性体と、接触体と弾性体とを収容する収納部であって、モータ筐体に設けられ、モータ筐体を介してステータと電気的に導通しているものと、一方がロータ軸端に固定し、他方が接触体先端部と接触可能な中空円筒状端部を有する導電部材と、を備え、接触体と弾性体と収納部が導電性の材料で作られていることを特徴とするものである。これにより、接触体と弾性体とは、収納体に収容されるユニット化した構造となっているので、ユニット全体としての取り付け・交換を容易に行うことができる。さらに、ロータ回転の際、導電部材の端部と接触体先端部とは、リング状に線接触することができ、ロータ回転による接触体の磨耗が発生しても長時間に安定な接触状態を維持することができる。 A first aspect of the present invention is an electric corrosion prevention unit for a wheel drive device, which is a contact body for electrically conducting with a rotor of a motor, and at least a part of a tip portion thereof has a circular cross-sectional shape. A conical surface or a spherical surface, an elastic body for pressing the contact body toward the rotor, and a storage section for housing the contact body and the elastic body, the motor housing being provided in the motor housing And a conductive member having a hollow cylindrical end that is fixed to the rotor shaft end and that can be brought into contact with the tip of the contact body. The elastic body and the storage portion are made of a conductive material. Thereby, since the contact body and the elastic body have a unitized structure accommodated in the storage body, the attachment and exchange as the whole unit can be easily performed. Furthermore, when the rotor rotates, the end of the conductive member and the tip of the contact body can be in line contact with each other in a ring shape, and a stable contact state can be obtained for a long time even if the contact body wears due to rotor rotation. Can be maintained.

本発明の導電部材は、その内径が、接触体先端部の外径の最も大きい部分より小さいことが好ましい。これにより、ロータ回転中、導電部材の被接触部と接触体の柱状外径面とは接触しまうことを防止でき、接触体の先端部との接触状態を確保することができる。 The conductive member of the present invention preferably has an inner diameter smaller than a portion having the largest outer diameter of the contact body tip. Thereby, it can prevent that the to-be-contacted part of an electrically-conductive member and the columnar outer diameter surface of a contact body contact during a rotor rotation, and can ensure the contact state with the front-end | tip part of a contact body.

また、導電部材の外径面には、接触体の磨耗屑を排出可能な開口部を備えることが好ましい。これにより、接触体の磨耗粉や磨耗破片のような磨耗屑は、接触体と導電部材の相対運動による遠心力で常に開口部から排出でき、磨耗屑の付着又は滞留による接触不良の発生を抑制できる。 Moreover, it is preferable to provide the opening part which can discharge | emit the abrasion waste of a contact body in the outer-diameter surface of an electrically-conductive member. As a result, wear debris such as contact powder and wear debris can always be discharged from the opening by centrifugal force due to the relative movement of the contact body and the conductive member, and the occurrence of poor contact due to the attachment or retention of wear debris is suppressed. it can.

本発明の第二の発明は、前記第一の発明の電食防止ユニットを備える車輪駆動装置である。すなわち、第二の発明に係る車輪駆動装置は第一の発明の電食防止ユニットを備え、電食防止ユニットの一方が導電部材によりモータのロータと電気的に導通し、他方が収納体によりモータのステータと電気的に導通することを特徴とする車輪駆動装置である。 2nd invention of this invention is a wheel drive device provided with the electrolytic corrosion prevention unit of said 1st invention. That is, the wheel drive device according to the second invention includes the electrolytic corrosion prevention unit of the first invention, one of the electrolytic corrosion prevention units is electrically connected to the rotor of the motor by the conductive member, and the other is the motor by the housing. The wheel drive device is electrically connected to the stator of the wheel.

さらに、本発明の車輪駆動装置の構造の好ましい一例として、モータ筐体と、モータ筐体内部に固定されるステータと、ステータの内周面に設けられるロータと、ロータ３０と同心に連結されており軸受で回転自在に支持されている中空シャフト４０と、中空シャフト４０の内径側に配置される遊星減速機５０と、中空シャフトと前記減速装置のサンギアとを連結し、車輪取り付け側の反対側へ延伸している軸を有する連結部材と、を備え、電食防止ユニットは一方がロータ軸端の連結部材に固定し、他方がモータ筐体に固定することで、ロータとステータを電気的に導通する形態が挙げられる。 Furthermore, as a preferable example of the structure of the wheel drive device of the present invention, a motor housing, a stator fixed inside the motor housing, a rotor provided on the inner peripheral surface of the stator, and the rotor 30 are concentrically connected. A hollow shaft 40 rotatably supported by a cage bearing, a planetary speed reducer 50 disposed on the inner diameter side of the hollow shaft 40, a hollow shaft and the sun gear of the speed reducer are connected, and the opposite side of the wheel mounting side A galvanic corrosion prevention unit, one of which is fixed to the connecting member at the end of the rotor shaft and the other is fixed to the motor housing, thereby electrically connecting the rotor and the stator. The form which conducts is mentioned.

電食防止ユニットを上述のようにモータ内に配置すると、モータや減速機が配置される空間と電食防止ユニットが配置される空間を隔離することができ、電食防止ユニット交換の際、モータ全体を分解することなく、容易に交換作業を行うことができる。 When the electric corrosion prevention unit is arranged in the motor as described above, the space where the motor and the speed reducer are arranged can be separated from the space where the electric corrosion prevention unit is arranged. The replacement work can be easily performed without disassembling the whole.

本発明の第一の発明に係る電食防止ユニットによれば、ロータとステータが電食防止ユニットを介して電気的に導通することにより、車両駆動装置の回転軸を支持するころがり軸受に軸電流が流れることが抑制されるため、転がり軸受に発生する電食を防止することができる。接触体と弾性体とは、収納体に収容されるユニット化した構造となっているので、ユニット全体としての取り付け・交換を容易に行うことができる。さらに、電食防止ユニットの接触体と、導電部材とは、リング状に線接触することができ、ロータ回転による接触体の磨耗が発生しても長時間に安定な接触状態を維持することができる。本発明の第二の発明に係る車輪駆動装置によれば、電食による軸受の損傷が抑制された車輪駆動装置を得ることができる。 According to the electrolytic corrosion preventing unit of the first aspect of the present invention, the rotor and the stator are electrically connected via the electrolytic corrosion preventing unit, whereby the shaft current is applied to the rolling bearing that supports the rotating shaft of the vehicle drive device. Therefore, it is possible to prevent electrolytic corrosion generated in the rolling bearing. Since the contact body and the elastic body have a unitized structure that is housed in the housing body, the attachment and replacement of the entire unit can be easily performed. Furthermore, the contact body of the electrolytic corrosion prevention unit and the conductive member can be in line contact with each other in a ring shape, and can maintain a stable contact state for a long time even if wear of the contact body due to rotor rotation occurs. it can. With the wheel drive device according to the second aspect of the present invention, it is possible to obtain a wheel drive device in which damage to the bearing due to electrolytic corrosion is suppressed.

第１の発明に係る電食防止ユニットの分解構造を示す斜視図である。It is a perspective view which shows the decomposition | disassembly structure of the electrolytic corrosion prevention unit which concerns on 1st invention. 第２の発明に係る車輪駆動装置の一例を示す断面図である。It is sectional drawing which shows an example of the wheel drive device which concerns on 2nd invention. 第２の発明に係る車輪駆動装置の電食防止ユニット取付け位置を説明する為の要部拡大図である。It is a principal part enlarged view for demonstrating the electric corrosion prevention unit attachment position of the wheel drive device which concerns on 2nd invention.

先ず、本発明の第一の発明に係る電食防止ユニット１００の構造について、図１を参照して説明する。電食防止ユニット１００は、プラグ状の収納体１１０と、弾性体１２０と、接触体１３０と、導電部材１４０により構成されている。収納体１１０と弾性体１２０と接触体１３０と導電部材１４０のいずれも導電材料で作られている。特に、接触体１３０は、接触する相手の接触部を傷つけないように、摺動性に優れ、ある程度の柔軟性を有するカーボンのような導電性材料で作られることが好ましい。 First, the structure of the electrolytic corrosion prevention unit 100 according to the first aspect of the present invention will be described with reference to FIG. The electrolytic corrosion prevention unit 100 includes a plug-shaped storage body 110, an elastic body 120, a contact body 130, and a conductive member 140. The storage body 110, the elastic body 120, the contact body 130, and the conductive member 140 are all made of a conductive material. In particular, the contact body 130 is preferably made of a conductive material such as carbon having excellent slidability and a certain degree of flexibility so as not to damage the contact portion of the contact partner.

弾性体１２０は、完全に止まり穴１１１に収容されるよう、伸縮しない自然長の状態では、止まり穴１１１の深さよりも短い。本実施形態の弾性体１２０は、コイルばねを利用しているが、それ以外のばね、たとえば板ばね、皿ばね等、又は導電性ゴム等の弾性部材を利用することができる。 The elastic body 120 is shorter than the depth of the blind hole 111 in a natural length state in which the elastic body 120 does not expand and contract so as to be completely accommodated in the blind hole 111. The elastic body 120 of the present embodiment uses a coil spring, but other springs such as a plate spring, a disc spring, or an elastic member such as conductive rubber can be used.

接触体１３０は、その末端部が弾性体１２０に付勢されるとともに、円錐状の先端部１３１が止まり穴１１１に露出するよう挿入され、収納体１１０の軸方向に進退できる。接触体１３０の先端部１３１は図１に示すような円錐面となっている。また、接触体１３０の先端部が導電部材１４０と接触する部分のみ円錐状であってよい。その他、接触体１３０の先端部又はその一部が、縦断面円形の曲面状、たとえば球面状であってもよい。 The contact body 130 is urged by the elastic body 120 at the end thereof, and is inserted so that the conical tip 131 is exposed in the blind hole 111, and can advance and retreat in the axial direction of the storage body 110. The tip 131 of the contact body 130 has a conical surface as shown in FIG. Further, only the portion where the tip of the contact body 130 is in contact with the conductive member 140 may be conical. In addition, the tip of the contact body 130 or a part thereof may be a curved surface with a circular longitudinal section, for example, a spherical shape.

収納体１１０は、弾性体１２０と接触体１３０を収納するものである。その外径面に、モータへ取り付けるための図示しないおねじが形成されており、その内径面の一端から止まり穴１１１（収納部）が形成されている。 The storage body 110 stores the elastic body 120 and the contact body 130. A male screw (not shown) for attaching to the motor is formed on the outer diameter surface, and a blind hole 111 (housing portion) is formed from one end of the inner diameter surface.

接触体１３０と収納体１１０の形状についは、本実施形態では、接触体１３０は、円錐台状先端部を有する円柱状となっており、収納体１１０の内径面に形成される止まり穴１１１もそれに対応する円筒状となっている。 Regarding the shapes of the contact body 130 and the storage body 110, in this embodiment, the contact body 130 has a columnar shape having a truncated cone-shaped tip, and a blind hole 111 formed on the inner diameter surface of the storage body 110 is also provided. It has a corresponding cylindrical shape.

さらに、止まり穴１１１と接触体１３０との径方向の間に、接触体１３０がなめらかに押圧方向に摺動可能な程度のわずかな隙間を設定されており、接触体１３０が軸を回転中心として回転可能となっている。 Further, a slight gap is set between the blind hole 111 and the contact body 130 in a radial direction so that the contact body 130 can smoothly slide in the pressing direction. It can be rotated.

その他、本実施形態の収納体１１０と接触体１３０は一体化の構造にしてもよい。この場合、収納体１１０と接触体１３０の中心軸を一致する必要がある。 In addition, the storage body 110 and the contact body 130 of the present embodiment may be integrated. In this case, it is necessary to match the central axes of the storage body 110 and the contact body 130.

導電部材１４０の一方がロータ軸端に固定する取付け部１４１を有し、取付け部１４１におねじを備えている。導電部材１４０の他方が、接触体１３０の先端部１３１と接触する端部１４２を有する。端部１４２は中空円筒状となっており、その内径が接触体１３０の外径のもっとも大きい部分より小さい。これにより、中空円筒状端部１４２の内径面が接触体中部の柱状外径面に当たらず、端部１４２と先端部１３１は線接触することができるので、回転中に接触体の柱状外径面が磨耗され外径が小さくなり接触不良になることを防止できる。特に限定しないが、本実施形態では、端部１４２の内径大きさは、接触体１３０の円錐面先端部１３１大径の７５％程度に設計している。 One of the conductive members 140 has an attachment portion 141 that is fixed to the rotor shaft end, and the attachment portion 141 is provided with a screw. The other side of the conductive member 140 has an end 142 that contacts the tip 131 of the contact body 130. The end 142 has a hollow cylindrical shape, and an inner diameter thereof is smaller than a portion having the largest outer diameter of the contact body 130. Thereby, the inner diameter surface of the hollow cylindrical end portion 142 does not hit the columnar outer diameter surface of the middle part of the contact body, and the end portion 142 and the tip end portion 131 can be in line contact with each other. It can be prevented that the surface is worn and the outer diameter is reduced to cause poor contact. Although not particularly limited, in the present embodiment, the inner diameter of the end 142 is designed to be about 75% of the large diameter of the conical surface tip 131 of the contact body 130.

さらに、端部１４２の縁部は、接触体１３０の円錐の開き角と同じ角度で面取りされることが好ましい。このようにすると、接触体１３０の磨耗を低減することができる。そのほか、導電部材１４０の中間部には、レゾルバロータ軸端と接触する押圧部１４３を配設してもよい。押圧部１４３があると、レゾルバロータ軸端との摩擦を増大し、ロータ回転による導電部材１４０の脱落を抑制できる。 Furthermore, the edge of the end 142 is preferably chamfered at the same angle as the cone opening angle of the contact body 130. If it does in this way, wear of contact object 130 can be reduced. In addition, a pressing portion 143 that comes into contact with the resolver rotor shaft end may be disposed at the intermediate portion of the conductive member 140. When the pressing portion 143 is present, friction with the resolver rotor shaft end is increased, and dropping of the conductive member 140 due to rotation of the rotor can be suppressed.

そのほか、ロータ回転の際、接触体１３０の先端部が磨耗され、磨耗屑を生じるので、中空円筒の外径面には、磨耗屑を排出する為の孔１４４を設けることが好ましい。 In addition, when the rotor rotates, the tip of the contact body 130 is worn and wear debris is generated. Therefore, it is preferable to provide a hole 144 for discharging the wear debris on the outer diameter surface of the hollow cylinder.

なお、本実施形態では、接触体１３０が弾性体１２０の押圧方向の一端と一体に接続されている形となっているが、接触体１３０と弾性体１２０を別体にしてもよい。 In the present embodiment, the contact body 130 is integrally connected to one end of the elastic body 120 in the pressing direction, but the contact body 130 and the elastic body 120 may be separated.

本実施形態によれば、電食防止ユニットは、一方が導電部材によりモータ回転軸と接触し、他方が収容体によりモータ筐体に取付けられることで、モータのロータとモータ筐体を電気的に導通させ、回転軸を支持する軸受の電食を防止できる。また、接触体と弾性体とは、収納体に収容されるユニット化した構造となっているので、ユニット全体としての取り付け・交換を容易に行うことができる。 According to this embodiment, one of the electrolytic corrosion prevention units is in contact with the motor rotation shaft by the conductive member, and the other is attached to the motor casing by the container, so that the motor rotor and the motor casing are electrically connected. It is possible to prevent electrical corrosion of the bearing supporting the rotating shaft. Further, since the contact body and the elastic body have a unitized structure accommodated in the storage body, the attachment and replacement as the entire unit can be easily performed.

次に、本発明の第二の発明に係る電食防止ユニット１００を備えるインホイールモータ１０００について、図２、３を参照して説明する。 Next, an in-wheel motor 1000 including the electrolytic corrosion prevention unit 100 according to the second aspect of the present invention will be described with reference to FIGS.

図２に示すように、本実施形態のインホイールモータ１０００は、インナーロータ型ラジアルギャップ式のものである。インホイールモータ１０００は、モータ筐体部分に該当するモータケース１０と、モータケース１０内部に固定されるステータ２０（固定子）と、ステータ２０の内周面側に設けられるロータ３０（回転子）と、ロータ３０と同心に連結されており軸受で回転自在に支持されている中空シャフト４０と、中空シャフト４０の内径側に配置される遊星減速機５０と、中空シャフト４０と遊星減速機５０のサンギア５１軸とを連結する連結部材４１と、を備える。 As shown in FIG. 2, the in-wheel motor 1000 of this embodiment is of an inner rotor type radial gap type. The in-wheel motor 1000 includes a motor case 10 corresponding to a motor housing portion, a stator 20 (stator) fixed inside the motor case 10, and a rotor 30 (rotor) provided on the inner peripheral surface side of the stator 20. A hollow shaft 40 concentrically connected to the rotor 30 and rotatably supported by bearings, a planetary reduction gear 50 disposed on the inner diameter side of the hollow shaft 40, and the hollow shaft 40 and the planetary reduction gear 50. And a connecting member 41 that connects the sun gear 51 shaft.

まず、本実施形態における車輪駆動装置の各部品の取り付け位置、およびそれらの役割について、説明する。 First, the attachment position of each component of the wheel drive device in this embodiment and their role will be described.

モータケース１０ａ,１０ｂ,１０ｃ３つの部分からに構成されているモータケース１０は、図示しないボルトによって締結されおり、Ｏリングにより外界からモータ内部を密封している。 The motor case 10 constituted by three parts of the motor cases 10a, 10b, and 10c is fastened by a bolt (not shown), and the inside of the motor is sealed from the outside by an O-ring.

ロータ３０は、冷しばめや焼きばめのような収縮締結方法で、中空シャフト４０に取り付けられている。 The rotor 30 is attached to the hollow shaft 40 by a shrinkage fastening method such as cold fitting or shrink fitting.

遊星減速機５０は、中空シャフト４０の内径部分に配置され、ロータの回転を減速して駆動軸７０を回転させる。遊星減速機５０のリングギヤ５２は減速機ケース１５に取り付けられる。 The planetary speed reducer 50 is disposed on the inner diameter portion of the hollow shaft 40 and decelerates the rotation of the rotor to rotate the drive shaft 70. The ring gear 52 of the planetary reduction gear 50 is attached to the reduction gear case 15.

ホイール側フランジ３１０と、モータ側フランジ３２０を備えるハブ軸受３００は、減速機ケース１５の内径部に、複数のハブボルト５００により締結されている。ホイール側フランジ３１０は、ハブボルト３４０と、図示しないホイールナットにて、図示しないブレーキディスクと、図示しないホイールと締結される。また、ホイール側フランジ３１０と、図示しないブレーキディスクと、図示しないホイールは、複列の鋼球（転動体）を介して、インホイールモータ１０００に対して回転自在に支持される。 The hub bearing 300 including the wheel side flange 310 and the motor side flange 320 is fastened to the inner diameter portion of the speed reducer case 15 by a plurality of hub bolts 500. The wheel side flange 310 is fastened to a brake disk (not shown) and a wheel (not shown) by a hub bolt 340 and a wheel nut (not shown). Further, the wheel side flange 310, a brake disk (not shown), and a wheel (not shown) are rotatably supported by the in-wheel motor 1000 via double rows of steel balls (rolling elements).

中空シャフト４０の回転角と回転角速度とは、レゾルバ６０によって検出される。検出された中空シャフト４０の回転角と回転角速度は、モータドライバで利用される。 The rotation angle and the rotation angular velocity of the hollow shaft 40 are detected by the resolver 60. The detected rotation angle and rotation angular velocity of the hollow shaft 40 are used by the motor driver.

レゾルバ６０は、レゾルバケース６５によって、外界とモータ内部との両側から密封されている。また、レゾルバケース６５には、電食防止ユニット１００を取り付けるためのねじ穴が形成されており、電食防止ユニット１００をモータ回転軸の軸中心に取り付ける為に、該ねじ穴の中心軸の位置は、ロータ３０の回転軸と一致している。 The resolver 60 is sealed from both sides of the outside world and the inside of the motor by a resolver case 65. Further, the resolver case 65 is formed with a screw hole for attaching the electrolytic corrosion prevention unit 100. In order to attach the electrolytic corrosion prevention unit 100 to the shaft center of the motor rotation shaft, the position of the central axis of the screw hole is determined. Is coincident with the rotation axis of the rotor 30.

オイルパン９０は、インホイールモータ１０００の冷却油兼潤滑油を一定量保持し、図示しないオイルの戻り流路に空気が入らないようになっている。オイルパン９０には、内部の潤滑油兼冷却油を抜き取るためのドレンプラグ９５が取付けられており、メインテナンスする際に、簡単にインホイールモータ１０００内部の油を抜き取ることが出来る。 The oil pan 90 holds a certain amount of the cooling oil / lubricating oil of the in-wheel motor 1000 so that air does not enter an oil return passage (not shown). The oil pan 90 is provided with a drain plug 95 for extracting internal lubricating oil and cooling oil, and the oil in the in-wheel motor 1000 can be easily extracted during maintenance.

次に、電食防止ユニット１００の取り付け、およびインホイールモータ１０００の内部における電食防止ユニット１００による電食防止構造について、図３を参照しながら説明する。 Next, the attachment of the electrolytic corrosion prevention unit 100 and the electrolytic corrosion prevention structure by the electrolytic corrosion prevention unit 100 inside the in-wheel motor 1000 will be described with reference to FIG.

電食防止ユニット１００は、一方に前述した収納体１１０にて、レゾルバケース６５ｂの前述のねじ穴に取り付けられており、他方に前述した導電部材１４０にて、連結部材４１の軸端に固定されている。電食防止ユニット１００の各部品は導電性材料で作られるので、電食防止ユニット１００をモータ１０００に取り付けると、ロータ３０およびモータ筐体（レゾルバケース６５とモータケース１０）は電気的導通状態となり、ステータ２０とロータ３０が導電して等電位になるので、ロータ３０を支持するアンギュラ玉軸受６１に電流が流れず、アンギュラ玉軸受６１の電食発生を防止することができる。 The electrolytic corrosion prevention unit 100 is attached to the above-described screw hole of the resolver case 65b by the storage body 110 described above on one side, and fixed to the shaft end of the connecting member 41 by the above-described conductive member 140 on the other side. ing. Since each part of the electric corrosion prevention unit 100 is made of a conductive material, when the electric corrosion prevention unit 100 is attached to the motor 1000, the rotor 30 and the motor housing (the resolver case 65 and the motor case 10) are in an electrically conductive state. Since the stator 20 and the rotor 30 conduct and become equipotential, no current flows through the angular ball bearing 61 that supports the rotor 30, and the occurrence of electrolytic corrosion of the angular ball bearing 61 can be prevented.

また、電食防止ユニット１００はその導電機能を働く為、インホイールモータ１０００が回転中、接触体１３０の先端部１３１と導電部材１４０の端部１４２との接触状態を維持する必要がある。しかし、接触体１３０は、前述のように消耗部品なので、導電部材１４０と接触体１３０が接触の状態でモータ回転し続けると、接触体１３０が磨耗され、導電部材１４０と接触できない状態となる。そこで、本発明は、弾性体１２０を用いて、接触体１３０を導電部材１４０に押し付け、接触状態を長時間に維持できる。 In addition, since the electric corrosion prevention unit 100 performs its conductive function, it is necessary to maintain the contact state between the tip portion 131 of the contact body 130 and the end portion 142 of the conductive member 140 while the in-wheel motor 1000 is rotating. However, since the contact body 130 is a consumable part as described above, if the motor continues to rotate while the conductive member 140 and the contact body 130 are in contact with each other, the contact body 130 is worn and cannot be brought into contact with the conductive member 140. Therefore, according to the present invention, the contact body 130 can be pressed against the conductive member 140 using the elastic body 120, and the contact state can be maintained for a long time.

接触体１３０の磨耗がさらに進行した時は、電食防止ユニット１００全体もしくは接触体１３０を交換することになる。電食防止ユニット１００はモータ筐体部分に該当するレゾルバケース６５にねじで連結されているので、容易に取り外し、交換が可能である。 When the wear of the contact body 130 further proceeds, the entire electrolytic corrosion prevention unit 100 or the contact body 130 is replaced. Since the electrolytic corrosion prevention unit 100 is connected to the resolver case 65 corresponding to the motor housing portion with a screw, it can be easily removed and replaced.

さらに、連結部材４１の軸がレゾルバケース６５を貫通する部分には、密封部材であるシールを設けている。これにより、接触体１３０の磨耗粉がモータや減速機の配置されている空間に侵入するのを防ぐことができる。 Further, a seal as a sealing member is provided at a portion where the shaft of the connecting member 41 passes through the resolver case 65. Thereby, it can prevent that the abrasion powder of the contact body 130 penetrate | invades into the space where the motor and the reduction gear are arrange | positioned.

その他、本実施形態では、中空シャフト４０と連結部材４１と導電部材１４０とは、別体となっているが、上述３つの部品のいずれか二つ若しくはすべてが一体の部品となってもよい。 In addition, in this embodiment, although the hollow shaft 40, the connection member 41, and the electrically-conductive member 140 are separate bodies, any two or all of the above-mentioned three components may be integrated.

本実施形態によれば、電食防止ユニット１００は、一方、接触体１３０が導電部材１４０と接触することで、ロータ３０と電気的に導通し、他方、収納体１１０がレゾルバケース６５を介してステータ２０と電気的導通する。これにより、ステータ２０とロータ３０が導電して等電位となり、アンギュラ玉軸受６１の電食発生を防止する。また、電食防止ユニット１００はレゾルバケース６５近傍に固定されるので、接触体を交換する際に、インホイールモータ１０００から電食防止ユニットの取り外しが容易となり、接触体の交換作業が簡単である。 According to the present embodiment, the electrolytic corrosion prevention unit 100 is electrically connected to the rotor 30 when the contact body 130 is in contact with the conductive member 140, and the storage body 110 is interposed via the resolver case 65. It is electrically connected to the stator 20. As a result, the stator 20 and the rotor 30 conduct and become equipotential, and the electrolytic corrosion of the angular ball bearing 61 is prevented. In addition, since the electrolytic corrosion prevention unit 100 is fixed in the vicinity of the resolver case 65, when replacing the contact body, it is easy to remove the electrolytic corrosion prevention unit from the in-wheel motor 1000, and the contact body replacement operation is simple. .

なお、本発明の電食防止ユニットは、本実施形態の上述モータ構造のみに用いることに限定されず、各種のインナーロータ式ブラシレスＤＣモータへの転用についても、本発明の権利範囲に属するものである。 The electrolytic corrosion prevention unit of the present invention is not limited to use only in the above-described motor structure of the present embodiment, and diversion to various inner rotor type brushless DC motors also belongs to the scope of the present invention. is there.

その他、本発明は上述の第１，２実施形態に限定するものではなく、本発明の技術的思想から、脱逸しない転用・改良された技術内容についても、本発明の権利範囲に属するものである。 In addition, the present invention is not limited to the first and second embodiments described above, and diverted and improved technical contents that do not escape from the technical idea of the present invention belong to the scope of the right of the present invention. is there.

本発明の車輪駆動装置用電食防止ユニットもしくは車輪駆動装置は、各種の車両、特に、電動スクーター、電気自動車、ハイブリッド自動車、四輪あるいはそれ以上の多輪駆動車両等に好適に使用できる。 The electric corrosion prevention unit for a wheel drive device or the wheel drive device of the present invention can be suitably used for various vehicles, in particular, electric scooters, electric vehicles, hybrid vehicles, four-wheel or more multi-wheel drive vehicles, and the like.

１０ モータ
２０ ステータ（固定子）
３０ ロータ（回転子）
４０ 中空シャフト
４１ 連結部材
４１１ フランジ部
４１２ 中空部
５０ 遊星減速機
５１ サンギア
５２ リングギア
６１ アンギュラ玉軸受
７０ 駆動軸
１００ 電食防止ユニット
１１０ 収納体
１１１ レゾルバケース取り付け部
１１１ 止まり穴（収納部）
１２０ 弾性体
１３０ 接触体
１３１ 先端部
１４０ 導電部材
１４１ 取り付け部
１４２ 端部
１４３ 押圧部
１４４ 孔（開口部） 10 Motor 20 Stator (stator)
30 Rotor
40 hollow shaft 41 connecting member 411 flange portion 412 hollow portion 50 planetary speed reducer 51 sun gear 52 ring gear 61 angular ball bearing 70 drive shaft 100 electric corrosion prevention unit 110 storage body 111 resolver case mounting portion 111 blind hole (storage portion)
120 Elastic body 130 Contact body 131 Tip portion 140 Conductive member 141 Mounting portion 142 End portion 143 Pressing portion 144 Hole (opening)

Claims (4)

モータのロータと電気的に導通させるための接触体であって、その先端部の少なくとも一部が、円形の断面形状を有する円錐面もしくは球面であるものと、
前記接触体をロータ側へ押圧するための弾性体と、
前記接触体と前記弾性体とを収容する収納部であって、モータ筐体に設けられ、前記モータ筐体を介してステータと電気的に導通しているものと、
一方がロータ軸端に固定し、他方が前記接触体先端部と接触可能な中空円筒状端部を有する導電部材と、を備え、
前記接触体と、前記弾性体と、前記収納部とが導電性の材料で作られていることを特徴とする車輪駆動装置用電食防止ユニット。 A contact body for electrical conduction with the rotor of the motor, at least a part of the tip of which is a conical surface or a spherical surface having a circular cross-sectional shape;
An elastic body for pressing the contact body toward the rotor;
A housing portion for housing the contact body and the elastic body, provided in a motor housing, and electrically connected to a stator via the motor housing;
A conductive member having one end fixed to the rotor shaft end and the other end having a hollow cylindrical end that can contact the contact body tip;
The electric corrosion prevention unit for a wheel drive device, wherein the contact body, the elastic body, and the storage portion are made of a conductive material. 前記導電部材の内径が、前記先端部の外径の最も大きい部分より小さいことを特徴とする請求項１に記載の電食防止ユニット。 2. The electrolytic corrosion prevention unit according to claim 1, wherein an inner diameter of the conductive member is smaller than a portion having the largest outer diameter of the tip portion. 前記導電部材の外径面には、前記接触体の磨耗屑を排出可能な開口部を有することを特徴とする請求項１又は請求項に記載の電食防止ユニット。 2. The electrolytic corrosion prevention unit according to claim 1, wherein an outer diameter surface of the conductive member has an opening through which wear debris of the contact body can be discharged. 請求項１〜３のいずれか１項に記載の電食防止ユニットを備える車輪駆動装置。 A wheel drive device comprising the electrolytic corrosion prevention unit according to any one of claims 1 to 3.
JP2009294087A 2009-12-25 2009-12-25 Electric corrosion prevention unit for wheel drive device and wheel drive device Expired - Fee Related JP5402619B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009294087A JP5402619B2 (en) 2009-12-25 2009-12-25 Electric corrosion prevention unit for wheel drive device and wheel drive device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009294087A JP5402619B2 (en) 2009-12-25 2009-12-25 Electric corrosion prevention unit for wheel drive device and wheel drive device

Publications (2)

Publication Number Publication Date
JP2011135722A true JP2011135722A (en) 2011-07-07
JP5402619B2 JP5402619B2 (en) 2014-01-29

Family

ID=44347859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009294087A Expired - Fee Related JP5402619B2 (en) 2009-12-25 2009-12-25 Electric corrosion prevention unit for wheel drive device and wheel drive device

Country Status (1)

Country Link
JP (1) JP5402619B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016171642A (en) * 2015-03-12 2016-09-23 Ntn株式会社 Motor drive unit
CN106464066A (en) * 2014-09-09 2017-02-22 株式会社Ｔｏｐ Motor
CN109194039A (en) * 2018-09-30 2019-01-11 广州小鹏汽车科技有限公司 A kind of motor shaft current eliminates structure and motor
CN112186975A (en) * 2019-07-02 2021-01-05 中车株洲电力机车研究所有限公司 Motor shaft current eliminating structure and motor
CN113949220A (en) * 2021-09-15 2022-01-18 浙江中车尚驰电气有限公司 Plug screw formula axle current protection electric installation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018204754A (en) 2017-06-08 2018-12-27 Ntn株式会社 Wheel bearing device with generator
JP7140608B2 (en) 2017-10-17 2022-09-21 Ntn株式会社 Power unit for vehicle and bearing unit for wheel with generator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195963U (en) * 1983-06-09 1984-12-26 トヨタ自動車株式会社 Rotating shaft grounding device
JP2002238205A (en) * 2001-02-13 2002-08-23 Tsurumi Mfg Co Ltd Electrolytic corrosion preventing device of submersible rotating machine
JP2005012982A (en) * 2003-06-23 2005-01-13 Toshiba Plant Systems & Services Corp Brush holder of rotating machine
JP2007016846A (en) * 2005-07-06 2007-01-25 Ntn Corp Bearing device for in-wheel motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195963U (en) * 1983-06-09 1984-12-26 トヨタ自動車株式会社 Rotating shaft grounding device
JP2002238205A (en) * 2001-02-13 2002-08-23 Tsurumi Mfg Co Ltd Electrolytic corrosion preventing device of submersible rotating machine
JP2005012982A (en) * 2003-06-23 2005-01-13 Toshiba Plant Systems & Services Corp Brush holder of rotating machine
JP2007016846A (en) * 2005-07-06 2007-01-25 Ntn Corp Bearing device for in-wheel motor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106464066A (en) * 2014-09-09 2017-02-22 株式会社Ｔｏｐ Motor
JPWO2016039058A1 (en) * 2014-09-09 2017-04-27 株式会社Ｔｏｐ motor
EP3157141A4 (en) * 2014-09-09 2018-02-28 Top Co., Ltd. Motor
US10218243B2 (en) 2014-09-09 2019-02-26 Top Co., Ltd. Motor structure for electrolytic corrosion protection of bearing
CN106464066B (en) * 2014-09-09 2019-03-26 株式会社Ｔｏｐ Motor
JP2016171642A (en) * 2015-03-12 2016-09-23 Ntn株式会社 Motor drive unit
CN109194039A (en) * 2018-09-30 2019-01-11 广州小鹏汽车科技有限公司 A kind of motor shaft current eliminates structure and motor
CN112186975A (en) * 2019-07-02 2021-01-05 中车株洲电力机车研究所有限公司 Motor shaft current eliminating structure and motor
CN113949220A (en) * 2021-09-15 2022-01-18 浙江中车尚驰电气有限公司 Plug screw formula axle current protection electric installation
CN113949220B (en) * 2021-09-15 2023-11-03 浙江中车尚驰电气有限公司 Screw plug type shaft current protection conductive device

Also Published As

Publication number Publication date
JP5402619B2 (en) 2014-01-29

Similar Documents

Publication Publication Date Title
JP5402619B2 (en) Electric corrosion prevention unit for wheel drive device and wheel drive device
CN103963567B (en) Bearing device for axle
JP2011135720A (en) Electrolytic-corrosion preventing unit for wheel driving device, and the wheel driving device
JP2015020707A (en) Wheel bearing device with built-in type in-wheel motor
JP3970890B2 (en) Wheel bearing device
JP2011111098A (en) Unit of preventing electric corrosion for wheel driving device and inner rotor type wheel driving device
JP2007271055A (en) Hub unit
JP2008057712A (en) Wheel bearing device
CN101529106B (en) Bearing device for wheel
JP6007655B2 (en) Wheel bearing device
CN204425085U (en) A kind of electric motor end cap protector being applicable to dirty environment
JP4823269B2 (en) Wheel bearing device
JP2007187218A (en) Bearing device for wheel
JP2008173995A (en) Bearing device for wheel
JP2016109293A (en) Rolling bearing unit for wheel support
CN112659812B (en) Hub unit bearing with generator
JP4567616B2 (en) Electric motor
JP5708403B2 (en) Sealing device for bearing
JP5030187B2 (en) Grease filling method for wheel bearing device
JP2007100715A (en) Bearing device for vehicle
JP5099875B2 (en) Wheel bearing device
JP2017065296A (en) Bearing device for wheel
KR20120010785A (en) Multiple bearing unit with integrating a housing
JP2007153051A (en) Bearing device for wheel
JP2013044363A (en) Rolling bearing

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20120810

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20120810

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20130912

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20131001

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20131014

R150 Certificate of patent or registration of utility model

Ref document number: 5402619

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees