JP2011168180A - Power-assisted bicycle - Google Patents

Power-assisted bicycle Download PDF

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JP2011168180A
JP2011168180A JP2010034147A JP2010034147A JP2011168180A JP 2011168180 A JP2011168180 A JP 2011168180A JP 2010034147 A JP2010034147 A JP 2010034147A JP 2010034147 A JP2010034147 A JP 2010034147A JP 2011168180 A JP2011168180 A JP 2011168180A
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motor
electric
resin
drive unit
cover
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Satoshi Ozawa
聡 小澤
Masafumi Kawakami
将史 川上
Koichiro Tsuruoka
宏一郎 鶴岡
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Panasonic Corp
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Panasonic Corp
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Priority to JP2010034147A priority Critical patent/JP2011168180A/en
Priority to PCT/JP2010/007587 priority patent/WO2011101946A1/en
Publication of JP2011168180A publication Critical patent/JP2011168180A/en
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    • 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
    • H02K5/08—Insulating casings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B60L15/2054—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed by controlling transmissions or clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/20—Electric propulsion with power supplied within the vehicle using propulsion power generated by humans or animals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/52—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by DC-motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/66—Arrangements of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/80—Accessories, e.g. power sources; Arrangements thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
    • H02K11/014—Shields associated with stationary parts, e.g. stator cores
    • H02K11/0141—Shields associated with casings, enclosures or brackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2200/00—Type of vehicles
    • B60L2200/12—Bikes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2220/00—Electrical machine types; Structures or applications thereof
    • B60L2220/50—Structural details of electrical machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/12—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • B60L2240/423—Torque
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power-assisted bicycle which can prevent electromagnetic wave noise from being entered into or egressed out of a motor drive unit while being construction which covers a resin molded electric motor with a cover made of a resin. <P>SOLUTION: The power-assisted bicycle is configured so that the electric motor 8 is resin-molded and the resin molded electric motor 8 is covered with the motor cover 20 made of the resin and a conducting layer 20a is formed on internal surface of the motor cover 20. Thereby, the electromagnetic wave noise is intercepted by the conducting layer 20a and therefore the power-assisted bicycle can prevent the electromagnetic wave noise from being entered into or egressed out of the motor drive unit 9 through the motor cover 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は電動自転車、特に電動自転車のモータ駆動ユニットに関する。   The present invention relates to an electric bicycle, and more particularly to a motor drive unit of an electric bicycle.

バッテリによって作動する電動モータを有するモータ駆動ユニットを備え、ペダルに作用する踏力（人力駆動力）に、前記モータ駆動ユニットから出力する補助駆動力（アシスト力）を加えることで、上り坂等でも楽に走行可能な電動自転車は既に知られている。この種の従来の電動自転車におけるモータ駆動ユニットのケースは、十分な強度を確保するためにケース全体がアルミダイキャスト製のものが用いられていた。モータ駆動ユニットには、電動モータのほかに、ペダルからの力をチェーンに伝達する大ギアが取り付けられたクランク軸の軸受、電動モータからの出力トルクをモータ駆動ユニット外部へ伝達するための歯車部、駆動力を車輪に伝達するチェーンに噛み合い、歯車部から伝達された駆動力をチェーンに伝達する出力スプロケットなどが設けられている。   Equipped with a motor drive unit that has an electric motor operated by a battery. By adding an auxiliary drive force (assist force) output from the motor drive unit to the pedaling force (human power drive force) acting on the pedal, it is easy even on uphills. Electric bicycles that can run are already known. In order to secure sufficient strength, the case of the motor drive unit in this type of conventional electric bicycle has been made of an aluminum die-cast case as a whole. In addition to the electric motor, the motor drive unit includes a crankshaft bearing with a large gear that transmits the force from the pedal to the chain, and a gear section for transmitting the output torque from the electric motor to the outside of the motor drive unit. An output sprocket that meshes with the chain that transmits the driving force to the wheels and transmits the driving force transmitted from the gear portion to the chain is provided.

しかし、モータ駆動ユニットのケース（筐体部）として、上記のように全てアルミダイキャスト製などの金属製のものを用いると、製造コストが極めて高価となる欠点がある。また、ケース全体が金属であるため、モータ駆動ユニットとしての重量が大きくなり、ひいては電動自転車の軽量化の妨げとなる問題もある。   However, if a case made of a metal such as aluminum die-casting is used as the case (housing portion) of the motor drive unit, there is a disadvantage that the manufacturing cost becomes extremely expensive. In addition, since the entire case is made of metal, there is a problem that the weight of the motor drive unit is increased, which in turn hinders the weight reduction of the electric bicycle.

このような欠点や問題に対処すべく、特許文献１などに開示されているように、電動モータの配設部分を、金属製のケースで覆うことなく、樹脂モールドすることが行われている。つまり、電動モータの配設部分については、電動モータの配設部分には外部から大きな力が作用することがなく、多大な強度を確保しなくても済むため、この電動モータの部分などを、金属製のケースで覆うことなく、樹脂モールドしているものである。なお、樹脂モールド部が外部に露出すると体裁が悪かったり、走行時に走行路に落ちているものなどに当たって損傷するおそれがあったりするので、樹脂モールドされた電動モータは樹脂製のカバーで覆われる。   In order to deal with such drawbacks and problems, as disclosed in Patent Document 1 and the like, resin molding is performed without covering the portion where the electric motor is disposed with a metal case. In other words, for the electric motor arrangement part, a large force does not act on the electric motor arrangement part from the outside, and it is not necessary to secure a great strength. It is resin-molded without being covered with a metal case. If the resin mold part is exposed to the outside, the appearance may be bad, or it may be damaged by hitting something that has fallen on the travel path during traveling, etc. Therefore, the resin-molded electric motor is covered with a resin cover.

このように、電動モータを樹脂モールドするとともに、この樹脂モールドされた電動モータを樹脂製のカバーで覆うことで、モータ駆動ユニットのケースを全て金属製とする場合と比較して、製造コストの低減化を図ることができる。また、モータ駆動ユニットの重量を小さくできて、電動自転車の軽量化を促進できる。   In this way, the electric motor is resin-molded, and the resin-molded electric motor is covered with a resin cover, thereby reducing the manufacturing cost compared to the case where the motor drive unit case is entirely made of metal. Can be achieved. Further, the weight of the motor drive unit can be reduced, and the weight reduction of the electric bicycle can be promoted.

特開２００３−２１９６０３号公報JP 2003-219603 A

しかしながら、電動モータを樹脂モールドするとともに、この樹脂モールドされた電動モータを樹脂製のカバーで覆っただけの構造であると、電動モータなどから発生する電磁波ノイズが樹脂製のカバーを通して電動自転車より外部に洩れたり、外部からの電磁波ノイズが樹脂製のカバーを通してモータ駆動ユニット内に侵入したりするおそれがあり、電動自転車としての信頼性が低下するという課題を生じる。   However, if the electric motor is resin-molded and the resin-molded electric motor is simply covered with a resin cover, electromagnetic noise generated from the electric motor or the like is external to the electric bicycle through the resin cover. Or electromagnetic noise from the outside may enter the motor drive unit through the resin cover, causing a problem that the reliability of the electric bicycle is lowered.

本発明は上記課題を解決するもので、電動モータを樹脂モールドするとともに、この樹脂モールドされた電動モータを樹脂製のカバーで覆う構造でありながら、電動モータなどから発生する電磁波ノイズが樹脂製のカバーを通して電動自転車より外部に洩れたり、外部からの電磁波ノイズが樹脂製のカバーを通してモータ駆動ユニット内に侵入したりすることを防止できる電動自転車を提供することを目的とする。   The present invention solves the above-mentioned problems. While the electric motor is resin-molded and the resin-molded electric motor is covered with a resin cover, electromagnetic noise generated from the electric motor or the like is made of resin. An object of the present invention is to provide an electric bicycle that can prevent leakage from the electric bicycle through the cover and electromagnetic noise from the outside to enter the motor drive unit through the resin cover.

上記課題を解決するために本発明の電動自転車は、補助駆動力を発生する電動モータを有するモータ駆動ユニットと、電動モータに駆動用の電力を供給するバッテリとを備えた電動自転車であって、電動モータが樹脂モールドされ、樹脂モールドされた電動モータが樹脂製のモータカバーで覆われ、前記モータカバーの内面に導電層が形成されていることを特徴とする。なお、導電層は、モータカバーの内面に導電塗装により形成すると好適である。   In order to solve the above problems, an electric bicycle of the present invention is an electric bicycle including a motor drive unit having an electric motor that generates an auxiliary driving force, and a battery that supplies electric power for driving to the electric motor, The electric motor is resin-molded, the resin-molded electric motor is covered with a resin motor cover, and a conductive layer is formed on the inner surface of the motor cover. The conductive layer is preferably formed on the inner surface of the motor cover by conductive coating.

この構成によれば、モータカバーの内面に導電層が形成されているので、電動モータなどから電磁波ノイズが発生した場合でも、この電磁波ノイズが、導電層により遮断され、樹脂製のモータカバーを通して電動自転車から外部に洩れ出ることを防止できる。また、外部からの電磁波ノイズがモータカバーから侵入しようとしても、モータカバー内面の導電層により遮断され、外部からの電磁波ノイズがモータ駆動ユニット内に侵入することを防止できる。   According to this configuration, since the conductive layer is formed on the inner surface of the motor cover, even when electromagnetic noise is generated from an electric motor or the like, the electromagnetic noise is blocked by the conductive layer and is electrically driven through the resin motor cover. It can prevent leakage from the bicycle to the outside. Further, even if electromagnetic noise from the outside tries to enter from the motor cover, it is blocked by the conductive layer on the inner surface of the motor cover, and it is possible to prevent the electromagnetic noise from the outside from entering the motor drive unit.

また、本発明の電動自転車は、補助駆動力を発生する電動モータを有するモータ駆動ユニットと、電動モータに駆動用の電力を供給するバッテリとを備えた電動自転車であって、電動モータが樹脂モールドされ、樹脂モールドされた電動モータが樹脂製のモータカバーで覆われ、樹脂モールドされた前記電動モータと前記モータカバーとの間に金属製で薄肉の薄肉金属材が介装されていることを特徴とする。   The electric bicycle of the present invention is an electric bicycle including a motor drive unit having an electric motor that generates an auxiliary driving force, and a battery that supplies driving electric power to the electric motor, and the electric motor is a resin mold. The resin-molded electric motor is covered with a resin-made motor cover, and a metal-made thin metal material is interposed between the resin-molded electric motor and the motor cover. And

この構成によれば、電動モータなどから発せられる電磁波ノイズが、前記電動モータと前記モータカバーとの間に介装されている薄肉金属材により遮断され、樹脂製のモータカバーを通して電動自転車から外部に洩れることを防止できる。また、外部からの電磁波ノイズがモータカバーから侵入しようとしても、前記薄肉金属材により遮断され、外部からの電磁波ノイズがモータ駆動ユニット内に侵入することを防止できる。   According to this configuration, electromagnetic noise generated from an electric motor or the like is blocked by the thin metal material interposed between the electric motor and the motor cover, and is passed from the electric bicycle to the outside through the resin motor cover. It can prevent leaking. Further, even if electromagnetic noise from the outside tries to enter from the motor cover, it is blocked by the thin metal material, and electromagnetic noise from outside can be prevented from entering the motor drive unit.

ここで、前記導電層や前記薄肉金属材を、モータ駆動ユニットの金属製のケース体に接触する状態でモータカバーを取り付けることで、前記導電層や前記薄肉金属材を、モータ駆動ユニットの金属製のケース体やモータ駆動ユニットが取り付けられている電動自転車のフレームに電気的にアースすることができて、電磁波ノイズを良好に吸収することができる。   Here, the conductive layer and the thin metal material are attached to the motor case in a state where the conductive layer and the thin metal material are in contact with the metal case body of the motor drive unit. The case body and the frame of the electric bicycle to which the motor drive unit is attached can be electrically grounded, and electromagnetic noise can be absorbed well.

なお、モータカバーにおける金属製のケース体への取付部の取付接触面にも導電層を形成させると、導電層が金属製のケース体に良好に密着して、アース性能が向上する。   If the conductive layer is also formed on the attachment contact surface of the attachment portion of the motor cover to the metal case body, the conductive layer adheres well to the metal case body, and the ground performance is improved.

本発明によれば、モータカバーの内面に導電層を形成したり、樹脂モールドされた電動モータとモータカバーとの間に薄肉金属材を介装したりすることにより、比較的簡単な構成で、製造コストの増加を最小限に抑えながら、電動モータなどから発生する電磁波ノイズが樹脂製のモータカバーを通して電動自転車より外部に洩れたり、外部からの電磁波ノイズがモータ駆動ユニット内に侵入することを確実に防止できる。この結果、電動モータなどから電磁波ノイズが発生した場合でも、電動自転車より外部に洩れることがないので、外部の機器などに悪影響を及ぼすことが確実に防止できるとともに、外部からの電磁波ノイズがモータ駆動ユニット内に侵入することによる誤動作なども確実に防止することができて、電動自転車としての信頼性が向上する。   According to the present invention, by forming a conductive layer on the inner surface of the motor cover, or by interposing a thin metal material between the resin-molded electric motor and the motor cover, with a relatively simple configuration, Ensure that electromagnetic noise generated from electric motors, etc. leaks from the electric bicycle through the resin motor cover, and electromagnetic noise from outside enters the motor drive unit while minimizing the increase in manufacturing cost. Can be prevented. As a result, even if electromagnetic noise is generated from an electric motor, etc., it will not leak outside from the electric bicycle, so it can be surely prevented from adversely affecting external devices, etc. A malfunction caused by entering the unit can be reliably prevented, and the reliability as an electric bicycle is improved.

本発明の実施の形態に係る電動自転車の側面図The side view of the electric bicycle concerning an embodiment of the invention 同電動自転車のモータ駆動ユニットの平面断面図Plan sectional view of the motor drive unit of the electric bicycle 同モータ駆動ユニットの斜視図Perspective view of the motor drive unit （ａ）〜（ｃ）は同モータ駆動ユニットのモータカバーの平面図、正面図、図４（ｂ）のIVc−IVc線矢視断面図(A)-(c) is a top view of a motor cover of the motor drive unit, a front view, and a sectional view taken along line IVc-IVc in FIG. 4 (b). （ａ）は同モータカバーの要部拡大断面図、（ｂ）は同モータカバーの取付用リブの斜視図(A) is an enlarged sectional view of the main part of the motor cover, (b) is a perspective view of a mounting rib of the motor cover. （ａ）および（ｂ）は、本発明の他の実施の形態に係る電動自転車のモータカバー、薄肉金属材、第２の金属ケースの要部を示す図(A) And (b) is a figure which shows the principal part of the motor cover of an electric bicycle which concerns on other embodiment of this invention, a thin metal material, and a 2nd metal case.

以下、本発明の実施の形態に係る電動自転車について図面に基づき説明する。
図１、図２において、１は電動自転車であり、この電動自転車１には、ヘッドパイプ２ａ、メインパイプ２ｂ、立パイプ２ｄ、チェーンステー２ｅ、後述するモータ駆動ユニット９を支持するための複数の支持ブラケット３２（一部のみ図２に示す）などからなる金属製のフレーム２と、前車輪３および後車輪４と、ハンドル５と、クランク６（クランク軸６ａ）およびペダル７と、補助駆動力（アシスト力）を発生させる電動モータ８などを有するモータ駆動ユニット９と、電動モータ８に駆動用の電力を供給する二次電池からなるバッテリ１０と、ペダル７からの踏力（人力駆動力）やモータ駆動ユニット９からの補助駆動力（アシスト力）を後車輪４に伝達するチェーン１１等が設けられている。 Hereinafter, an electric bicycle according to an embodiment of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes an electric bicycle. The electric bicycle 1 includes a plurality of head pipes 2a, a main pipe 2b, a standing pipe 2d, a chain stay 2e, and a plurality of motor driving units 9 for supporting a motor drive unit 9 described later. A metal frame 2 including a support bracket 32 (only a part of which is shown in FIG. 2), a front wheel 3 and a rear wheel 4, a handle 5, a crank 6 (crankshaft 6a) and a pedal 7, and auxiliary driving force A motor drive unit 9 having an electric motor 8 for generating (assist force), a battery 10 composed of a secondary battery that supplies drive power to the electric motor 8, and a pedaling force (manpower driving force) from the pedal 7; A chain 11 and the like for transmitting auxiliary drive force (assist force) from the motor drive unit 9 to the rear wheel 4 are provided.

モータ駆動ユニット９は、樹脂モールドされた電動モータ８と、この樹脂モールドされた電動モータ８を覆うＡＥＳ（アクリロニトリル−エチレン−スチレン）樹脂などからなる樹脂製のモータカバー２０と、電動モータ８の出力軸８ａに形成された減速用小ギア１２と、この減速用小ギア１２に噛み合う減速用大ギア１３と、減速用大ギア１３の出力部である補助駆動力出力軸１４に取り付けられてチェーン１１と噛み合う補助駆動力出力ギア１５と、電動自転車の各種の制御を行う制御基板（制御部）１６と、クランク軸６ａを回転自在に支持するクランク軸受１７と、電動モータ８の出力軸８ａを回転自在に支持するモータ軸受１８と、補助駆動力出力軸１４を回転自在に支持する補助駆動力出力軸受１９と、クランク軸６ａに対して所定間隔を保った状態で配設され、ペダルを介してクランク軸に付与された人力（踏力）を検出する人力検出手段としてのトルクセンサユニット２２と、電動モータ８以外の前記構成要素（減速用大ギア１３、補助駆動力出力軸１４、制御部１６、クランク軸６ａの中央寄り部分、トルクセンサユニット２２、補助駆動力出力軸受１９、クランク軸受１７など）を収容するそれぞれ金属製のケース体としての第１金属ケース２３および第２金属ケース２４などを備えている。また、モータ駆動ユニット９から突出するクランク軸６ａの右側部分には、クランク軸６ａに作用した人力駆動力（踏力）をチェーン１１に伝達する大ギア２５が取り付けられている。   The motor drive unit 9 includes a resin-molded electric motor 8, a resin motor cover 20 made of AES (acrylonitrile-ethylene-styrene) resin or the like covering the resin-molded electric motor 8, and an output of the electric motor 8. A chain 11 is attached to a speed reduction small gear 12 formed on the shaft 8a, a speed reduction large gear 13 meshing with the speed reduction small gear 12, and an auxiliary driving force output shaft 14 which is an output portion of the speed reduction large gear 13. Auxiliary driving force output gear 15 that meshes with each other, a control board (control unit) 16 that performs various controls of the electric bicycle, a crank bearing 17 that rotatably supports the crankshaft 6a, and an output shaft 8a of the electric motor 8 that rotates. A motor bearing 18 that freely supports, an auxiliary driving force output bearing 19 that rotatably supports the auxiliary driving force output shaft 14, and the crankshaft 6a. Torque sensor unit 22 as human power detecting means that is arranged in a state of maintaining a constant interval and detects human power (stepping force) applied to the crankshaft via a pedal, and the above-described components (for deceleration) other than electric motor 8 Large metal 13, auxiliary driving force output shaft 14, control unit 16, part near the center of crankshaft 6a, torque sensor unit 22, auxiliary driving force output bearing 19, crank bearing 17 and the like as respective metal case bodies The first metal case 23 and the second metal case 24 are provided. In addition, a large gear 25 that transmits a manual driving force (stepping force) acting on the crankshaft 6 a to the chain 11 is attached to the right portion of the crankshaft 6 a protruding from the motor drive unit 9.

また、モータ駆動ユニット９を支持するための複数の支持ブラケット３２（一部のみ図２に示す）が、例えば、メインパイプ２ｂの後端部などから垂下する姿勢で取り付けられているとともに、この支持ブラケット３２が、例えばメインパイプ２ｂの後端部とチェーンステー２ｅの前端部とを連結する姿勢で取り付けられている。そして、これらの支持ブラケット３２ならびに、この支持ブラケット３２と第１金属ケース２３と第２金属ケース２４とを連結する連結ボルト２６および連結ナット３３などを介して、モータ駆動ユニット９が、フレーム２におけるメインパイプ２ｂの後端部近傍箇所から吊り下げられた姿勢で取り付けられている。このようにこの実施の形態では、モータ駆動ユニット９が電動自転車１における前後方向の中央部の下部に配設されている。   In addition, a plurality of support brackets 32 (a part of which is shown in FIG. 2) for supporting the motor drive unit 9 are attached in a posture that hangs down from the rear end of the main pipe 2b, for example, and this support For example, the bracket 32 is attached in a posture to connect the rear end portion of the main pipe 2b and the front end portion of the chain stay 2e. The motor drive unit 9 is attached to the frame 2 via the support bracket 32 and the connection bolt 26 and the connection nut 33 that connect the support bracket 32 to the first metal case 23 and the second metal case 24. The main pipe 2b is attached in a posture suspended from the vicinity of the rear end portion thereof. As described above, in this embodiment, the motor drive unit 9 is disposed in the lower part of the central portion of the electric bicycle 1 in the front-rear direction.

さらに、結合ボルトおよび結合ナット２７（図２、図３参照）を介して、電動モータ８を収容したモータカバー２０が第２金属ケース２４に結合されて固定されている。ここで特に、モータカバー２０は、内面のほぼ全面が導電塗装されて、薄肉の導電層２０ａが形成されている。また、モータカバー２０には、第２金属ケース２４への取付用リブ２０ｂが複数箇所に形成されており、取付用リブ２０ｂには、結合ボルト２７が挿通される挿通孔２０ｃが形成されている。そして、取付用リブ２０ｂの取付接触面としての内面（裏面）にも導電層２０ａが形成されており、結合ボルト２７による結合時に取付用リブ２０ｂが第２金属ケース２４の取付部分に良好に密着し、導電層２０ａが第２金属ケース２４に良好に接触するよう図られている。なお、必要に応じて、モータカバー２０の内面にも、モータカバー２０の剛性を高めたり、装着位置をより正確に規制したりするために、適宜リブを形成してもよい。また、モータカバー２０の内面に両面粘着テープ２８（図４（ｃ）参照）を介装して、モータカバー２０と電動モータ８のモールド部分との密着性を向上させてもよい。また、この実施の形態では、モータカバー２０の取付用リブ２０ｂにおける結合ボルトおよび結合ナット２７の取付部２０ｂ’（図５（ｂ）参照）が窪まされて、結合ボルトおよび結合ナット２７がモータカバー２０よりあまり突出しないよう図られて、足や衣服などが引っ掛かることを低減している。また、導電層２０ａの厚みは例えば１５μｍ以上であれば好ましい。   Further, the motor cover 20 that houses the electric motor 8 is coupled and fixed to the second metal case 24 via a coupling bolt and a coupling nut 27 (see FIGS. 2 and 3). Here, in particular, the motor cover 20 has a thin conductive layer 20a formed by conductively coating almost the entire inner surface. The motor cover 20 has a plurality of mounting ribs 20b to the second metal case 24, and the mounting ribs 20b have insertion holes 20c through which the coupling bolts 27 are inserted. . The conductive layer 20a is also formed on the inner surface (back surface) as the mounting contact surface of the mounting rib 20b, and the mounting rib 20b adheres well to the mounting portion of the second metal case 24 when coupled by the coupling bolt 27. In addition, the conductive layer 20 a is intended to make good contact with the second metal case 24. If necessary, ribs may be appropriately formed on the inner surface of the motor cover 20 in order to increase the rigidity of the motor cover 20 or more accurately regulate the mounting position. Further, a double-sided adhesive tape 28 (see FIG. 4C) may be interposed on the inner surface of the motor cover 20 to improve the adhesion between the motor cover 20 and the mold portion of the electric motor 8. Further, in this embodiment, the coupling bolt and the coupling nut 27 of the mounting rib 20b of the motor cover 20 and the mounting portion 20b '(see FIG. 5B) of the coupling nut 27 are recessed, so that the coupling bolt and the coupling nut 27 become the motor cover. It is designed so as not to protrude more than 20, so that the foot or clothes are not caught. Further, the thickness of the conductive layer 20a is preferably 15 μm or more, for example.

上記構成によれば、モータカバー２０の内面に導電層２０ａが形成されているので、電動モータ８などから発生する電磁波ノイズが導電層２０ａにより遮断され、樹脂製のモータカバー２０を通して電動自転車１より外部に洩れることを防止できる。また、外部からの電磁波ノイズがモータカバー２０から侵入しようとしても、モータカバー２０内面の導電層２０ａにより前記電磁波ノイズが遮断され、モータ駆動ユニット９内に侵入することを防止できる。この結果、電動モータ８などから電磁波ノイズが発生した場合でも、電動自転車１（モータ駆動ユニット９）より外部に洩れることがないので、外部の機器などに悪影響を及ぼすことが確実に防止できるとともに、外部からの電磁波ノイズがモータ駆動ユニット９内に侵入することによる誤動作なども確実に防止することができて、電動自転車１としての信頼性が向上する。これにより、いわゆるＥＭＣ（電磁環境両立性）性能を十分に満足する電動自転車１を得られる。   According to the above configuration, since the conductive layer 20 a is formed on the inner surface of the motor cover 20, electromagnetic noise generated from the electric motor 8 and the like is blocked by the conductive layer 20 a and passes through the resin motor cover 20 from the electric bicycle 1. It can prevent leaking outside. Further, even if electromagnetic noise from the outside tries to enter from the motor cover 20, the electromagnetic noise is blocked by the conductive layer 20 a on the inner surface of the motor cover 20 and can be prevented from entering the motor drive unit 9. As a result, even when electromagnetic noise is generated from the electric motor 8 or the like, the electric bicycle 1 (the motor drive unit 9) does not leak to the outside, so that adverse effects on external devices can be reliably prevented, A malfunction caused by electromagnetic noise from the outside entering the motor drive unit 9 can be reliably prevented, and the reliability of the electric bicycle 1 is improved. Thereby, the electric bicycle 1 which fully satisfies what is called EMC (electromagnetic environment compatibility) performance can be obtained.

なお、導電層２０ａの形成方法としては、上述したように、金属成分を含有する塗装材料を塗装することによる、いわゆる導電塗装により形成すると極めて良好に薄肉かつ均一な導電層２０ａを比較的安価かつ良好に形成することができる。しかしながら、これに限るものではなく、メッキ処理などにより導電層２０ａを形成してもよい。   As described above, the conductive layer 20a is formed by applying a coating material containing a metal component, as described above, so that a thin and uniform conductive layer 20a can be formed relatively well and inexpensively when formed by so-called conductive coating. It can be formed satisfactorily. However, the present invention is not limited to this, and the conductive layer 20a may be formed by plating or the like.

また、上記構成によれば、樹脂製のモータカバー２０の内面に薄肉の導電層２０ａを形成するだけなので、モータカバー全体を金属製とする場合と比較して、軽量かつ安価にモータカバー２０を製造することができる。   In addition, according to the above configuration, since the thin conductive layer 20a is only formed on the inner surface of the resin motor cover 20, the motor cover 20 can be reduced in weight and at a lower cost than when the entire motor cover is made of metal. Can be manufactured.

また、モータカバー２０を第２金属ケース２４に取り付ける取付用リブ２０ｂの内面（裏面）にも導電層２０ａが形成されているので、モータカバー２０を第２金属ケース２４に取り付けた際に、導電層２０ａが第２金属ケース２４に良好に接触し、この第２金属ケース２４や、第２金属ケース２４と合わせて取り付けられる第１金属ケース２３は、金属製のフレーム２に取り付けられているので、これらの第１、第２の金属ケース２３、２４やフレーム２に電気的にアースすることができて、電磁波ノイズを良好に吸収することができる。   Further, since the conductive layer 20a is also formed on the inner surface (rear surface) of the mounting rib 20b for attaching the motor cover 20 to the second metal case 24, the conductive layer 20a is electrically conductive when the motor cover 20 is attached to the second metal case 24. Since the layer 20a is in good contact with the second metal case 24, the second metal case 24 and the first metal case 23 attached together with the second metal case 24 are attached to the metal frame 2. The first and second metal cases 23 and 24 and the frame 2 can be electrically grounded, and electromagnetic wave noise can be absorbed well.

次に、本発明の他の実施の形態について説明する。
図６（ａ）、（ｂ）に示すように、本実施の形態では、モータカバー２０の内面に導電層２０ａを形成する代わりに、モータカバー２０自体は内面も含めて、単なる樹脂で形成する一方、樹脂モールドされた電動モータ８とモータカバー２０との間に金属製で薄肉の薄肉金属材３０を介装している。すなわち、アルミ箔などの薄肉の金属材からなる薄肉金属材３０を、電動モータ８（図６では、電動モータ８の外郭部となる、モータカバー２０および薄肉金属材３０と第２金属ケース２４とのみを示す）とモータカバー２０との間に介装する。なお、薄肉金属材３０の配設方法としては、プレス成形などにより、予め、モータカバー２０の内面に薄肉金属材３０を圧着したり、薄肉金属材３０を電動モータ８の樹脂モールド部分に被せた上で、モータカバー２０を取り付けたりしてもよい。 Next, another embodiment of the present invention will be described.
As shown in FIGS. 6A and 6B, in this embodiment, instead of forming the conductive layer 20a on the inner surface of the motor cover 20, the motor cover 20 itself including the inner surface is formed of simple resin. On the other hand, a thin metal material 30 made of metal is interposed between the resin-molded electric motor 8 and the motor cover 20. That is, the thin metal material 30 made of a thin metal material such as aluminum foil is replaced with the electric motor 8 (in FIG. 6, the motor cover 20, the thin metal material 30 and the second metal case 24 which are the outer portions of the electric motor 8 Between the motor cover 20 and the motor cover 20. As a method for arranging the thin metal material 30, the thin metal material 30 is previously pressure-bonded to the inner surface of the motor cover 20 by press molding or the resin mold portion of the electric motor 8 is covered with the thin metal material 30. The motor cover 20 may be attached above.

この構成によっても、上記実施の形態と同様な作用効果を得ることができる。なお、図示しないが、この実施の形態でも、モータカバー２０における第２金属ケース２４への取付部である取付用リブ２０ｂの取付接触面としての内面（裏面）に相当する箇所にも薄肉金属材３０を配設することで、モータカバー２０を第２金属ケース２４に取り付けた際に、薄肉金属材３０が第２金属ケース２４に良好に接触し、第１、第２の金属ケース２３、２４やフレーム２に電気的に良好にアースすることができる。   Also with this configuration, it is possible to obtain the same operational effects as the above-described embodiment. Although not shown, even in this embodiment, a thin metal material is also provided at a portion corresponding to the inner surface (back surface) as the mounting contact surface of the mounting rib 20b that is the mounting portion of the motor cover 20 to the second metal case 24. By arranging 30, when the motor cover 20 is attached to the second metal case 24, the thin metal material 30 makes good contact with the second metal case 24, and the first and second metal cases 23, 24 are arranged. And the frame 2 can be electrically grounded satisfactorily.

また、上記実施の形態では、モータ駆動ユニット９が電動自転車１における前後方向の中央部の下部に配設されている場合を述べ、この場合には、電動自転車１の重心の近傍にモータ駆動ユニット９が配設されるため、安定性や操舵性が優れる利点があるが、これに限るものではない。   Moreover, in the said embodiment, the case where the motor drive unit 9 is arrange | positioned in the lower part of the center part of the front-back direction in the electric bicycle 1 is described, In this case, the motor drive unit is located in the vicinity of the center of gravity of the electric bicycle 1. 9 is provided, there is an advantage that stability and steering performance are excellent, but the present invention is not limited to this.

本発明は、補助駆動力を付与可能な各種の電動自転車に良好に適用できる。また、本発明の電動自転車としては、人力駆動力（踏力）が作用している際のみ、補助駆動力が付加されるものに限るものではなく、人力駆動力（踏力）がない場合にも、補助駆動力を付加して、電動自転車を移動できるものにも適用可能である。   The present invention can be satisfactorily applied to various types of electric bicycles capable of providing auxiliary driving force. In addition, the electric bicycle of the present invention is not limited to the case where the auxiliary driving force is added only when the human driving force (stepping force) is applied, and even when there is no human driving force (stepping force), The present invention can also be applied to an apparatus that can move an electric bicycle by adding an auxiliary driving force.

１ 電動自転車
２ フレーム
３ 前車輪
４ 後車輪
６ クランク
６ａ クランク軸
７ ペダル
８ 電動モータ
９ モータ駆動ユニット
１０ バッテリ
１１ チェーン
１６ 制御基板（制御部）
２０ モータカバー
２０ａ 導電層
２０ｂ 取付用リブ
２３ 第１金属ケース（ケース体）
２４ 第２金属ケース（ケース体）
３０ 薄肉金属材 DESCRIPTION OF SYMBOLS 1 Electric bicycle 2 Frame 3 Front wheel 4 Rear wheel 6 Crank 6a Crankshaft 7 Pedal 8 Electric motor 9 Motor drive unit 10 Battery 11 Chain 16 Control board (control part)
20 motor cover 20a conductive layer 20b mounting rib 23 first metal case (case body)
24 Second metal case (case body)
30 Thin metal materials

Claims (7)

補助駆動力を発生する電動モータを有するモータ駆動ユニットと、電動モータに駆動用の電力を供給するバッテリとを備えた電動自転車であって、
電動モータが樹脂モールドされ、樹脂モールドされた電動モータが樹脂製のモータカバーで覆われ、前記モータカバーの内面に導電層が形成されていることを特徴とする電動自転車。 An electric bicycle comprising a motor drive unit having an electric motor for generating an auxiliary drive force, and a battery for supplying drive electric power to the electric motor,
An electric bicycle, wherein an electric motor is resin-molded, the resin-molded electric motor is covered with a resin motor cover, and a conductive layer is formed on an inner surface of the motor cover. モータ駆動ユニットの金属製のケース体に、モータカバーの導電層が接触する状態でモータカバーが取り付けられていることを特徴とする請求項１記載の電動自転車。   The electric bicycle according to claim 1, wherein the motor cover is attached to a metal case body of the motor drive unit in a state where the conductive layer of the motor cover is in contact. モータカバーにおける金属製のケース体への取付部の取付接触面にも導電層が形成されていることを特徴とする請求項２に記載の電動自転車。   The electric bicycle according to claim 2, wherein a conductive layer is also formed on an attachment contact surface of an attachment portion of the motor cover to the metal case body. 導電層が導電塗装により形成されていることを特徴とする請求項１〜３の何れか１項に記載の電動自転車。   The electric bicycle according to any one of claims 1 to 3, wherein the conductive layer is formed by conductive coating. 補助駆動力を発生する電動モータを有するモータ駆動ユニットと、電動モータに駆動用の電力を供給するバッテリとを備えた電動自転車であって、
電動モータが樹脂モールドされ、樹脂モールドされた電動モータが樹脂製のモータカバーで覆われ、樹脂モールドされた前記電動モータと前記モータカバーとの間に金属製で薄肉の薄肉金属材が介装されていることを特徴とする電動自転車。 An electric bicycle comprising a motor drive unit having an electric motor for generating an auxiliary drive force, and a battery for supplying drive electric power to the electric motor,
The electric motor is resin-molded, the resin-molded electric motor is covered with a resin motor cover, and a metal thin thin metal material is interposed between the resin-molded electric motor and the motor cover. Electric bicycle characterized by that. モータ駆動ユニットの金属製のケース体に、薄肉金属材が接触する状態でモータカバーが取り付けられていることを特徴とする請求項５記載の電動自転車。   6. The electric bicycle according to claim 5, wherein a motor cover is attached to a metal case body of the motor drive unit in a state where the thin metal material is in contact therewith. モータ駆動ユニットが前後方向の中央部の下部に配設されていることを特徴とする請求項１〜６の何れか１項に記載の電動自転車。   The electric bicycle according to any one of claims 1 to 6, wherein the motor drive unit is disposed at a lower portion of a central portion in the front-rear direction.
JP2010034147A 2010-02-19 2010-02-19 Power-assisted bicycle Pending JP2011168180A (en)

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JP2010034147A JP2011168180A (en) 2010-02-19 2010-02-19 Power-assisted bicycle
PCT/JP2010/007587 WO2011101946A1 (en) 2010-02-19 2010-12-28 Electric bicycle

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