JPWO2020179203A1 - Left and right wheel drive - Google Patents

Left and right wheel drive Download PDF

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JPWO2020179203A1
JPWO2020179203A1 JP2021503429A JP2021503429A JPWO2020179203A1 JP WO2020179203 A1 JPWO2020179203 A1 JP WO2020179203A1 JP 2021503429 A JP2021503429 A JP 2021503429A JP 2021503429 A JP2021503429 A JP 2021503429A JP WO2020179203 A1 JPWO2020179203 A1 JP WO2020179203A1
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motor
oil
drive device
wheel drive
output shaft
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JP7238961B2 (en
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直紀 谷口
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Mitsubishi Motors Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/02—Arrangement or mounting of electrical propulsion units comprising more than one electric motor
    • 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
    • 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
    • B60L9/00—Electric propulsion with power supply external to the vehicle
    • B60L9/16—Electric propulsion with power supply external to the vehicle using ac induction motors
    • B60L9/18—Electric propulsion with power supply external to the vehicle using ac induction motors fed from dc supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/20—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members
    • F16H1/22—Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members with a plurality of driving or driven shafts; with arrangements for dividing torque between two or more intermediate shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/06—Differential gearings with gears having orbital motion
    • F16H48/10—Differential gearings with gears having orbital motion with orbital spur gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H48/00—Differential gearings
    • F16H48/36—Differential gearings characterised by intentionally generating speed difference between outputs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • General Details Of Gearings (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

左右輪を駆動する二つのモータ（１，２）と、モータ（１，２）のトルク差を増幅して左右輪の各々に伝達する歯車機構（３）とを具備する左右輪駆動装置（１０）では、二つのモータ（１，２）が互いに離隔して対向配置され、歯車機構（３）が二つのモータ（１，２）よりも下方に配置される。左右輪駆動装置（１０）は、モータ（１，２）及び歯車機構（３）を収容する収容ケース（１Ｄ，２Ｄ，１５）と、二つのモータ（１，２）間であって収容ケース（１５）の上部に設けられたオイル注入口（１７ａ）と、注入口（１７ａ）から注入されたオイルを各モータ（１，２）に導くための第一経路（４）と、注入口（１７ａ）から注入されたオイルを下方へ落とし、少なくともモータ（１，２）から左右輪への動力伝達経路上に位置する歯車（２１〜２４）の一部にオイルを導くための第二経路（５）と、を備える。A left and right wheel drive device (10) including two motors (1, 2) for driving the left and right wheels and a gear mechanism (3) for amplifying the torque difference between the motors (1, 2) and transmitting the torque difference to each of the left and right wheels. ), The two motors (1, 2) are arranged so as to be separated from each other and face each other, and the gear mechanism (3) is arranged below the two motors (1, 2). The left and right wheel drive device (10) is a storage case (1D, 2D, 15) that houses the motors (1, 2) and the gear mechanism (3), and a storage case (1D, 2D, 15) between the two motors (1, 2). An oil injection port (17a) provided in the upper part of the 15), a first path (4) for guiding the oil injected from the injection port (17a) to each motor (1, 2), and an injection port (17a). ), The second path (5) for dropping the oil injected downward and guiding the oil to at least a part of the gears (21 to 24) located on the power transmission path from the motors (1, 2) to the left and right wheels. ) And.

Description

本発明は、車両の左右輪を駆動する二つのモータと、これらのモータのトルク差を増幅して左右輪の各々に伝達する歯車機構とを備えた左右輪駆動装置に関し、特に冷却及び潤滑用の構造に関する。 The present invention relates to a left and right wheel drive device including two motors for driving the left and right wheels of a vehicle and a gear mechanism that amplifies the torque difference between these motors and transmits the torque difference to each of the left and right wheels, particularly for cooling and lubrication. Regarding the structure of.

従来、独立した二つのモータからの駆動トルクを左右の駆動輪に伝達する際に、二つの駆動トルクの差（トルク差）を増幅して伝達する増幅機構を備えた車両が知られている。増幅機構を備えることで、大きなトルク差を左右輪に与えられるというメリットがある一方、駆動装置全体が大型化するというデメリットがある。例えば、二つのモータを車軸上に配置した場合には車幅方向の寸法増大を回避しにくい。このため、モータを車軸上には配置せず、モータからの駆動トルクの差を増幅機構に伝達するようにした車両駆動装置が提案されている（例えば特許文献１参照）。 Conventionally, a vehicle provided with an amplification mechanism for amplifying and transmitting the difference (torque difference) between two drive torques when transmitting the drive torques from two independent motors to the left and right drive wheels is known. By providing an amplification mechanism, there is an advantage that a large torque difference can be given to the left and right wheels, but there is a disadvantage that the entire drive device becomes large. For example, when two motors are arranged on the axle, it is difficult to avoid an increase in dimensions in the vehicle width direction. Therefore, there has been proposed a vehicle drive device in which the motor is not arranged on the axle and the difference in drive torque from the motor is transmitted to the amplification mechanism (see, for example, Patent Document 1).

特開２０１７−２０３５０３号公報Japanese Unexamined Patent Publication No. 2017-20503

ところで、駆動装置のハウジング内には、シャフトと軸受との摺動面の潤滑やロータ及びステータの冷却を担う潤滑油が封入される。この潤滑油は、ハウジング内の潤滑及び冷却が必要な箇所に適切に供給されないと、潤滑不良や冷却不良を招き、駆動装置としての機能を正常に発揮できないおそれがある。 By the way, the lubricating oil responsible for lubricating the sliding surfaces of the shaft and the bearing and cooling the rotor and the stator is sealed in the housing of the drive device. If this lubricating oil is not properly supplied to a portion of the housing that requires lubrication and cooling, poor lubrication or cooling may occur, and the function as a drive device may not be exhibited normally.

本件の左右輪駆動装置は、このような課題に鑑み案出されたもので、潤滑性能及び冷却性能を向上させることを目的の一つとする。なお、この目的に限らず、後述する発明を実施するための形態に示す各構成により導かれる作用効果であって、従来の技術によっては得られない作用効果を奏することも本件の他の目的である。 The left and right wheel drive device of this case was devised in view of such a problem, and one of the purposes is to improve the lubrication performance and the cooling performance. Not limited to this purpose, it is also an action and effect derived by each configuration shown in the embodiment for carrying out the invention described later, and it is also for another purpose of this case to exert an action and effect which cannot be obtained by the conventional technique. be.

（１）ここで開示する左右輪駆動装置は、車両の左右輪を駆動する第一モータ及び第二モータと、前記第一モータ及び前記第二モータのトルク差を増幅して前記左右輪の各々に伝達する歯車機構とを具備し、前記第一モータ及び前記第二モータが互いに離隔して対向配置され、前記歯車機構が前記第一モータ及び前記第二モータよりも下方に配置されている。この左右輪駆動装置は、前記第一モータ，前記第二モータ及び前記歯車機構を収容する収容ケースと、前記第一モータ及び前記第二モータの間であって前記収容ケースの上部に設けられ、前記収容ケース内にオイルを注入するための注入口と、前記注入口から注入された前記オイルを前記第一モータ及び前記第二モータに導くための第一経路と、前記注入口から注入された前記オイルを下方へ落とし、少なくとも前記第一モータ及び前記第二モータから前記左右輪への動力伝達経路上に位置する歯車の一部に前記オイルを導くための第二経路と、を備えている。 (1) The left and right wheel drive devices disclosed here are each of the left and right wheels by amplifying the torque difference between the first motor and the second motor that drive the left and right wheels of the vehicle and the first motor and the second motor. The first motor and the second motor are arranged so as to be separated from each other and face each other, and the gear mechanism is arranged below the first motor and the second motor. The left and right wheel drive devices are provided between the accommodating case accommodating the first motor, the second motor and the gear mechanism, and the first motor and the second motor, and are provided on the upper part of the accommodating case. An injection port for injecting oil into the storage case, a first path for guiding the oil injected from the injection port to the first motor and the second motor, and injection from the injection port. It is provided with a second path for dropping the oil downward and guiding the oil to at least a part of gears located on the power transmission path from the first motor and the second motor to the left and right wheels. ..

（２）前記第一モータ及び前記第二モータの各回転軸が同軸に配置されていることが好ましい。この場合、前記左右輪駆動装置は、前記各回転軸と同軸上かつ前記各回転軸間に位置するモータ軸と、前記第一モータ及び前記第二モータの間であって前記モータ軸の上部の空間において前記収容ケースの内方向へ凹設された凹部と、を備えており、前記注入口が前記凹部に設けられていることが好ましい。 (2) It is preferable that the rotation axes of the first motor and the second motor are coaxially arranged. In this case, the left and right wheel drive devices are a motor shaft located coaxially with each of the rotation shafts and between the rotation shafts, and between the first motor and the second motor, and above the motor shaft. It is preferable that the space is provided with a recess recessed inward in the storage case, and the injection port is provided in the recess.

（３）前記第一経路は、前記第一モータ及び前記第二モータの中空状の前記各回転軸における複数個所で放射状に穿孔された孔部を含むことが好ましい。
（４）前記第二経路は、前記注入口の下方において前記収容ケースと前記モータ軸の一端とにより形成されたスリット部を含むことが好ましい。(3) It is preferable that the first path includes holes radially perforated at a plurality of positions in each of the hollow rotating shafts of the first motor and the second motor.
(4) The second path preferably includes a slit portion formed by the accommodating case and one end of the motor shaft below the injection port.

（５）前記左右輪駆動装置は、一端側に前記歯車機構が配置され、他端側に前記左右輪の一方が配置された出力軸と、前記動力伝達経路上に位置し、前記出力軸の外周面の一部に摺動可能に外嵌される円筒部を有する出力歯車と、前記円筒部を径方向に貫設した少なくとも一つの第一貫通孔と、前記出力軸の前記外周面及び前記円筒部の内周面の間で軸方向に延設された隙間とを含み、前記歯車機構に含まれる軸受に前記オイルを導くための第三経路と、を備えていることが好ましい。 (5) In the left and right wheel drive device, the gear mechanism is arranged on one end side, and one of the left and right wheels is arranged on the other end side, and the output shaft is located on the power transmission path of the output shaft. An output gear having a cylindrical portion slidably fitted to a part of the outer peripheral surface, at least one first through hole through which the cylindrical portion is radially penetrated, the outer peripheral surface of the output shaft, and the said. It is preferable to include a gap extending in the axial direction between the inner peripheral surfaces of the cylindrical portion, and to provide a third path for guiding the oil to the bearing included in the gear mechanism.

（６）前記出力軸は、中空円筒状に形成されていることが好ましい。この場合、前記第三経路は、前記出力軸を径方向に貫設した少なくとも一つの第二貫通孔を含むことが好ましい。
（７）前記左右輪駆動装置は、前記収容ケースの下部に設けられ、前記オイルを貯留する貯留部を備えることが好ましい。この場合、前記オイルの流れが停止したときの最高油面が前記出力軸の回転中心以上に設定されており、前記第一貫通孔が、前記円筒部の周方向に等間隔で複数箇所に形成されていることが好ましい。(6) The output shaft is preferably formed in a hollow cylindrical shape. In this case, the third path preferably includes at least one second through hole penetrating the output shaft in the radial direction.
(7) It is preferable that the left and right wheel drive devices are provided in the lower part of the storage case and include a storage unit for storing the oil. In this case, the maximum oil level when the oil flow is stopped is set above the rotation center of the output shaft, and the first through holes are formed at a plurality of locations at equal intervals in the circumferential direction of the cylindrical portion. It is preferable that it is.

（８）前記左右輪駆動装置は、前記収容ケースの下部に設けられ、前記オイルを貯留する貯留部と、前記貯留部に形成され、前記オイルを外部に吸引するための吸引口と、を備えていることが好ましい。この場合、前記オイルの循環中における最低油面が、前記吸引口よりも上方に設定されていることが好ましい。 (8) The left and right wheel drive device is provided at the lower part of the storage case, and includes a storage portion for storing the oil and a suction port formed in the storage portion for sucking the oil to the outside. Is preferable. In this case, it is preferable that the lowest oil level in the circulation of the oil is set above the suction port.

開示の左右輪駆動装置によれば、二種類のオイルの通り道を設けることで、効率良く左右のモータ及び歯車機構のそれぞれにオイルを供給できる。これにより、潤滑性能及び冷却性能を高めることができる。 According to the disclosed left and right wheel drive devices, oil can be efficiently supplied to each of the left and right motors and gear mechanisms by providing two types of oil passages. Thereby, the lubrication performance and the cooling performance can be improved.

実施形態に係る左右輪駆動装置の構成を説明するための模式図である。It is a schematic diagram for demonstrating the structure of the left-right wheel drive device which concerns on embodiment. 実施形態に係る左右輪駆動装置を例示するスケルトン図である。It is a skeleton diagram which illustrates the left-right wheel drive device which concerns on embodiment. 図１のＡ−Ａ矢視断面図である。FIG. 1 is a cross-sectional view taken along the line AA of FIG. 図１の左右輪駆動装置の注入口周辺を拡大して示す模式的な断面図である。FIG. 3 is a schematic cross-sectional view showing the periphery of the injection port of the left and right wheel drive device of FIG. 1 in an enlarged manner. 図１の左右輪駆動装置の貯留部周辺を拡大して示す模式的な断面図である。FIG. 3 is a schematic cross-sectional view showing the periphery of the storage portion of the left and right wheel drive devices of FIG. 1 in an enlarged manner.

図面を参照して、実施形態としての左右輪駆動装置について説明する。以下に示す実施形態はあくまでも例示に過ぎず、以下の実施形態で明示しない種々の変形や技術の適用を排除する意図はない。本実施形態の各構成は、それらの趣旨を逸脱しない範囲で種々変形して実施することができる。また、必要に応じて取捨選択することができ、あるいは適宜組み合わせることができる。 The left and right wheel drive device as an embodiment will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed, or it can be combined as appropriate.

［１．全体構成］
本実施形態の左右輪駆動装置（以下「駆動装置１０」という）を図１に示す。この駆動装置１０は、ＡＹＣ（アクティブヨーコントロール）機能を持った車両用のディファレンシャル装置であり、左右輪の間に介装される。ＡＹＣ機能とは、左右駆動輪における駆動力（駆動トルク）の分担割合を主体的に制御することでヨーモーメントの大きさを調節し、これを以て車両のヨー方向の姿勢を安定させる機能である。本実施形態の駆動装置１０は、ＡＹＣ機能だけでなく、回転力を左右輪に伝達して車両を走行させる機能と、車両旋回時に発生する左右輪の回転数差を受動的に吸収する機能とを併せ持つ。[1. overall structure]
The left and right wheel drive device (hereinafter referred to as “drive device 10”) of the present embodiment is shown in FIG. The drive device 10 is a differential device for a vehicle having an AYC (active yaw control) function, and is interposed between the left and right wheels. The AYC function is a function that adjusts the magnitude of the yaw moment by independently controlling the sharing ratio of the driving force (driving torque) in the left and right drive wheels, thereby stabilizing the posture of the vehicle in the yaw direction. The drive device 10 of the present embodiment has not only the AYC function but also a function of transmitting a rotational force to the left and right wheels to drive the vehicle and a function of passively absorbing the difference in the number of rotations of the left and right wheels generated when the vehicle turns. Also have.

駆動装置１０は、左右輪を駆動する第一モータ１及び第二モータ２と、第一モータ１及び第二モータ２の回転速度を減速しながら伝達する減速ギヤ列と、第一モータ１及び第二モータ２のトルク差を増幅して左右輪の各々に伝達する歯車機構３とを備える。第一モータ１は車両の左側に配置され、第二モータ２は右側に配置される。これらの第一モータ１及び第二モータ２は、図示しないバッテリの電力で駆動される交流モータであり、好ましくは出力特性がほぼ同一とされる。左右駆動輪のトルクは可変であり、第一モータ１と第二モータ２とのトルク差が、歯車機構３において増幅されて左右輪の各々に伝達される。 The drive device 10 includes a first motor 1 and a second motor 2 that drive the left and right wheels, a reduction gear train that transmits while decelerating the rotational speeds of the first motor 1 and the second motor 2, and the first motor 1 and the first motor 2. (2) A gear mechanism 3 that amplifies the torque difference of the motor 2 and transmits it to each of the left and right wheels is provided. The first motor 1 is located on the left side of the vehicle and the second motor 2 is located on the right side. These first motor 1 and second motor 2 are AC motors driven by the electric power of a battery (not shown), and preferably have substantially the same output characteristics. The torque of the left and right drive wheels is variable, and the torque difference between the first motor 1 and the second motor 2 is amplified by the gear mechanism 3 and transmitted to each of the left and right wheels.

第一モータ１には、回転軸１Ａと一体で回転するロータ１Ｂと、モータハウジング１Ｄ（収容ケース）に固定されたステータ１Ｃとが設けられる。同様に、第二モータ２には、回転軸２Ａと一体で回転するロータ２Ｂと、モータハウジング２Ｄ（収容ケース）に固定されたステータ２Ｃとが設けられる。第一モータ１及び第二モータ２は、二つの回転軸１Ａ，２Ａがいずれも車幅方向に延びる姿勢で、互いに離隔して対向配置される。各回転軸１Ａ，２Ａは回転中心Ｃ１が一致するように同軸上に配置される。 The first motor 1 is provided with a rotor 1B that rotates integrally with the rotating shaft 1A and a stator 1C fixed to the motor housing 1D (accommodation case). Similarly, the second motor 2 is provided with a rotor 2B that rotates integrally with the rotating shaft 2A and a stator 2C fixed to the motor housing 2D (accommodation case). The first motor 1 and the second motor 2 are arranged so as to be separated from each other and face each other in a posture in which the two rotating shafts 1A and 2A both extend in the vehicle width direction. The rotation axes 1A and 2A are arranged coaxially so that the rotation centers C1 coincide with each other.

歯車機構３は、所定の増幅率でトルク差を増幅する機能を持ち、例えば差動機構や遊星歯車機構等で構成される。図２に、遊星歯車機構で構成された歯車機構３の一例を示す。この歯車機構３は、サンギヤ３Ｓ１及びリングギヤ３Ｒが入力要素であり、サンギヤ３Ｓ２及びキャリア３Ｃが出力要素であるダブルピニオン遊星歯車である。サンギヤ３Ｓ１には第一モータ１からのトルクが入力され、リングギヤ３Ｒには第二モータ２からのトルクが入力される。入力要素は後述する出力歯車２４と一体回転するよう設けられ、出力要素は後述する出力軸１３と一体回転するように設けられる。 The gear mechanism 3 has a function of amplifying a torque difference at a predetermined amplification factor, and is composed of, for example, a differential mechanism, a planetary gear mechanism, or the like. FIG. 2 shows an example of a gear mechanism 3 configured by a planetary gear mechanism. The gear mechanism 3 is a double pinion planetary gear in which the sun gear 3S1 and the ring gear 3R are input elements, and the sun gear 3S2 and the carrier 3C are output elements. The torque from the first motor 1 is input to the sun gear 3S1, and the torque from the second motor 2 is input to the ring gear 3R. The input element is provided so as to rotate integrally with the output gear 24 described later, and the output element is provided so as to rotate integrally with the output shaft 13 described later.

図５に示すように、本実施形態の歯車機構３には、三つの軸受３４〜３６が含まれる。各軸受３４〜３６は、遊星歯車機構の要素（歯車）の軸方向に働く力を受け止めるスラストベアリングである。なお、歯車機構３の構成はこれに限られず、様々な構成の遊星歯車機構や遊星歯車機構以外の機構を採用可能である。 As shown in FIG. 5, the gear mechanism 3 of the present embodiment includes three bearings 34 to 36. Each bearing 34 to 36 is a thrust bearing that receives an axial force acting on an element (gear) of the planetary gear mechanism. The configuration of the gear mechanism 3 is not limited to this, and various configurations other than the planetary gear mechanism and the planetary gear mechanism can be adopted.

図１及び図２に示すように、本実施形態の駆動装置１０には、いずれも平行に配置された三つの軸が二組設けられ、これら三つの軸に二段階で減速する減速ギヤ列が設けられる。以下、三つの軸を、各モータ１，２から左右輪への動力伝達経路の上流側から順に、モータ軸１１，カウンタ軸１２，出力軸１３と呼ぶ。これらの軸１１〜１３は二つずつ設けられる。図１に示すように、左右に位置する二つのモータ軸１１，二つのカウンタ軸１２，二つの出力軸１３は、それぞれが同様に（左右対称に）構成される。また、これらの軸１１〜１３に設けられる減速ギヤ列も左右で同様に（左右対称に）構成される。 As shown in FIGS. 1 and 2, the drive device 10 of the present embodiment is provided with two sets of three shafts arranged in parallel, and a reduction gear train for decelerating in two stages is provided on these three shafts. It will be provided. Hereinafter, the three shafts will be referred to as a motor shaft 11, a counter shaft 12, and an output shaft 13 in this order from the upstream side of the power transmission path from the motors 1 and 2 to the left and right wheels. Two of these shafts 11 to 13 are provided. As shown in FIG. 1, the two motor shafts 11, the two counter shafts 12, and the two output shafts 13 located on the left and right are configured in the same manner (symmetrically). Further, the reduction gear trains provided on these shafts 11 to 13 are similarly (symmetrically) configured on the left and right sides.

モータ軸１１は、回転中心Ｃ１を持つ中空円筒形状に形成され、左右のモータ１，２の各回転軸１Ａ，２Ａと同軸上に位置する。本実施形態のモータ軸１１は回転軸１Ａ，２Ａと一体で設けられているが、これらが別体で設けられて接合，連結されたものであってもよい。モータ軸１１には、モータ歯車２１が介装される。モータ軸１１は、第一モータ１及び第二モータ２の間に位置し、互いに離隔する二つの軸受３１（図４に一方のみを示す）により回転自在に支持される。 The motor shaft 11 is formed in a hollow cylindrical shape having a rotation center C1 and is located coaxially with the rotation shafts 1A and 2A of the left and right motors 1 and 2. The motor shaft 11 of the present embodiment is provided integrally with the rotating shafts 1A and 2A, but these may be provided separately and joined or connected. A motor gear 21 is interposed in the motor shaft 11. The motor shaft 11 is located between the first motor 1 and the second motor 2 and is rotatably supported by two bearings 31 (only one is shown in FIG. 4) that are separated from each other.

カウンタ軸１２は、回転中心Ｃ２を持つ中空円筒状に形成され、モータ軸１１と平行に配置される。カウンタ軸１２には、モータ歯車２１と噛合する第一中間歯車２２と、第一中間歯車２２よりも小径の第二中間歯車２３とが介装される。左側の第二中間歯車２３は、左側の第一中間歯車２２よりも第一モータ１側（左側）に配置され、右側の第二中間歯車２３は、右側の第一中間歯車２２よりも第二モータ２側（右側）に配置される。すなわち、大径の第一中間歯車２２の方が小径の第二中間歯車２３よりも車幅方向内側に配置される。なお、これらの中間歯車２２，２３は互いに近接配置されることが好ましい。また、モータ歯車２１と第一中間歯車２２とで、一段目の減速ギヤ列が構成される。 The counter shaft 12 is formed in a hollow cylindrical shape having a rotation center C2, and is arranged in parallel with the motor shaft 11. The counter shaft 12 is interposed with a first intermediate gear 22 that meshes with the motor gear 21 and a second intermediate gear 23 having a diameter smaller than that of the first intermediate gear 22. The second intermediate gear 23 on the left side is arranged on the first motor 1 side (left side) of the first intermediate gear 22 on the left side, and the second intermediate gear 23 on the right side is second than the first intermediate gear 22 on the right side. It is arranged on the motor 2 side (right side). That is, the large-diameter first intermediate gear 22 is arranged inside the vehicle width direction of the small-diameter second intermediate gear 23. It is preferable that these intermediate gears 22 and 23 are arranged close to each other. Further, the motor gear 21 and the first intermediate gear 22 form a first-stage reduction gear train.

カウンタ軸１２は、第一モータ１及び第二モータ２の間に位置し、互いに離隔する二つの軸受３２（図４に一方のみを示す）により回転自在に支持される。また、図３に示すように、カウンタ軸１２は側面視で、第一中間歯車２２が第一モータ１及び第二モータ２の外周面１ｆ，２ｆよりも径方向内側に位置するように配置される。つまり、カウンタ軸１２上の歯車２２，２３は、車両側方から見ると、モータ１，２と完全に重なっている。さらに本実施形態のカウンタ軸１２は、側面視で、モータ軸１１と出力軸１３とを結ぶ仮想的な直線Ｌ（二点鎖線）よりも車両下方に配置される。 The counter shaft 12 is located between the first motor 1 and the second motor 2 and is rotatably supported by two bearings 32 (only one is shown in FIG. 4) that are separated from each other. Further, as shown in FIG. 3, the counter shaft 12 is arranged so that the first intermediate gear 22 is located radially inside the outer peripheral surfaces 1f and 2f of the first motor 1 and the second motor 2 in a side view. NS. That is, the gears 22 and 23 on the counter shaft 12 completely overlap with the motors 1 and 2 when viewed from the vehicle side. Further, the counter shaft 12 of the present embodiment is arranged below the vehicle from the virtual straight line L (dashed-dotted line) connecting the motor shaft 11 and the output shaft 13 in a side view.

図１に示すように、出力軸１３は、回転中心Ｃ３を持つ中空円筒状に形成され、モータ軸１１と平行に配置される。出力軸１３には、第二中間歯車２３と噛合する出力歯車２４が介装される。第二中間歯車２３と出力歯車２４とで、二段目の減速ギヤ列が構成される。これらの各歯車２１〜２４は、左右のモータ１，２から左右輪への動力伝達経路上に位置する。 As shown in FIG. 1, the output shaft 13 is formed in a hollow cylindrical shape having a rotation center C3 and is arranged in parallel with the motor shaft 11. An output gear 24 that meshes with the second intermediate gear 23 is interposed in the output shaft 13. The second intermediate gear 23 and the output gear 24 form a second-stage reduction gear train. Each of these gears 21 to 24 is located on the power transmission path from the left and right motors 1 and 2 to the left and right wheels.

本実施形態の出力歯車２４は、外歯が形成された歯部２４ａと一体で設けられた円筒部２４ｂを有し、円筒部２４ｂが出力軸１３の外周面の一部に摺動可能に外嵌されることで出力軸１３に介装される。出力歯車２４は、例えば弦巻線状の歯筋を有するはすば歯車であり、駆動装置１０に内装される最大径のギヤである。なお、出力軸１３の外周面と円筒部２４ｂの内周面との間には、後述する隙間６ｂ（図５参照）が設けられる。 The output gear 24 of the present embodiment has a cylindrical portion 24b provided integrally with the tooth portion 24a on which the external teeth are formed, and the cylindrical portion 24b is slidable on a part of the outer peripheral surface of the output shaft 13. By being fitted, it is interposed in the output shaft 13. The output gear 24 is, for example, a helical gear having a string winding-shaped tooth line, and is a gear having the maximum diameter built in the drive device 10. A gap 6b (see FIG. 5), which will be described later, is provided between the outer peripheral surface of the output shaft 13 and the inner peripheral surface of the cylindrical portion 24b.

出力軸１３の一端側（車幅方向内側）には歯車機構３が配置され、出力軸１３の他端側（車幅方向外側）には左右輪の一方が配置される。つまり、駆動装置１０では、左右のモータ１，２が、左右輪が設けられる出力軸１３上に配置されず、出力軸１３からオフセットして配置される。なお、図１には左右輪の図示を省略し、左右輪に連結されるジョイント部１４を図示している。 The gear mechanism 3 is arranged on one end side (inside in the vehicle width direction) of the output shaft 13, and one of the left and right wheels is arranged on the other end side (outside in the vehicle width direction) of the output shaft 13. That is, in the drive device 10, the left and right motors 1 and 2 are not arranged on the output shaft 13 on which the left and right wheels are provided, but are arranged offset from the output shaft 13. Note that FIG. 1 omits the illustration of the left and right wheels, and shows the joint portion 14 connected to the left and right wheels.

歯車機構３は、第一モータ１及び第二モータ２の下方に位置し、第一モータ１側の出力歯車２４と第二モータ２側の出力歯車２４との間に配置される。歯車機構３が遊星歯車機構である場合には、歯車機構３の出力要素と出力軸１３とが一体回転するよう設けられる。例えば図２に示すように、歯車機構３の出力要素（サンギヤ３Ｓ２，キャリア３Ｃ）と出力軸１３とが一体回転するように設けられる。なお、出力軸１３と歯車機構３との連結方法は図２に示すものに限られない。 The gear mechanism 3 is located below the first motor 1 and the second motor 2, and is arranged between the output gear 24 on the first motor 1 side and the output gear 24 on the second motor 2 side. When the gear mechanism 3 is a planetary gear mechanism, the output element of the gear mechanism 3 and the output shaft 13 are provided so as to rotate integrally. For example, as shown in FIG. 2, the output element (sun gear 3S2, carrier 3C) of the gear mechanism 3 and the output shaft 13 are provided so as to rotate integrally. The method of connecting the output shaft 13 and the gear mechanism 3 is not limited to that shown in FIG.

図１に示すように、出力軸１３は、互いに離隔する二つの軸受３３により軸支される。本実施形態の出力軸１３は、出力軸１３に外嵌された円筒部２４ｂが軸受３３により軸支されることで、ケーシング１５（収容ケース）に対して回転可能に軸支される。一端側（車幅方向内側）の軸受３３は歯部２４ａに近接配置され、他端側（車幅方向外側）の軸受３３は円筒部２４ｂの端部に配置される。このように二つの軸受３３の間隔を広く確保することで、出力軸１３が安定する。なお、出力軸１３の外周面と円筒部２４ｂの内周面とは、他端側の軸受３３の径方向内側において摺動接触する。 As shown in FIG. 1, the output shaft 13 is pivotally supported by two bearings 33 that are separated from each other. The output shaft 13 of the present embodiment is rotatably supported with respect to the casing 15 (accommodation case) by supporting the cylindrical portion 24b externally fitted to the output shaft 13 by a bearing 33. The bearing 33 on one end side (inside in the vehicle width direction) is arranged close to the tooth portion 24a, and the bearing 33 on the other end side (outside in the vehicle width direction) is arranged at the end of the cylindrical portion 24b. By ensuring a wide distance between the two bearings 33 in this way, the output shaft 13 is stabilized. The outer peripheral surface of the output shaft 13 and the inner peripheral surface of the cylindrical portion 24b are in sliding contact with each other on the radial inner side of the bearing 33 on the other end side.

出力軸１３の車幅方向外側の端部には、ジョイント部１４が設けられる。本実施形態のジョイント部１４は、第一モータ１及び第二モータ２の端面１ｅ，２ｅよりも車幅方向外側に配置される。言い換えると、ジョイント部１４が各モータ１，２の端面１ｅ，２ｅよりも車幅方向外側に位置するように、出力軸１３の長さが設定される。また、図３に示すように、出力軸１３は側面視で、出力歯車２４の一部が第一モータ１及び第二モータ２と重なるように配置される。 A joint portion 14 is provided at an end portion of the output shaft 13 on the outer side in the vehicle width direction. The joint portion 14 of the present embodiment is arranged outside the end faces 1e and 2e of the first motor 1 and the second motor 2 in the vehicle width direction. In other words, the length of the output shaft 13 is set so that the joint portion 14 is located outside the end faces 1e and 2e of the motors 1 and 2 in the vehicle width direction. Further, as shown in FIG. 3, the output shaft 13 is arranged so that a part of the output gear 24 overlaps with the first motor 1 and the second motor 2 in a side view.

図１に示すように、本実施形態のケーシング１５は、第一モータ１及び第二モータ２の各モータハウジング１Ｄ，２Ｄに連結され、各軸１１〜１３や歯車機構３等を収容するものである。ケーシング１５は一体ものであってもよいし、複数のパーツが組み合わされて構成されたものであってもよい。ケーシング１５の上面は、各モータハウジング１Ｄ，２Ｄの外周面１ｆ，２ｆよりも回転中心Ｃ１側に位置する。これにより、駆動装置１０には、第一モータ１及び第二モータ２の間であってケーシング１５の上部に位置する凹部１６が設けられる。凹部１６は、左右のモータ１，２の間であってモータ軸１１の上方に空間を形成する部位であり、ケーシング１５の内方向へ凹設された部位ともいえる。 As shown in FIG. 1, the casing 15 of the present embodiment is connected to the motor housings 1D and 2D of the first motor 1 and the second motor 2, and accommodates the shafts 11 to 13 and the gear mechanism 3 and the like. be. The casing 15 may be an integral piece or may be formed by combining a plurality of parts. The upper surface of the casing 15 is located closer to the rotation center C1 than the outer peripheral surfaces 1f and 2f of the motor housings 1D and 2D. As a result, the drive device 10 is provided with a recess 16 located between the first motor 1 and the second motor 2 and located above the casing 15. The recess 16 is a portion between the left and right motors 1 and 2 that forms a space above the motor shaft 11, and can be said to be a portion recessed inward in the casing 15.

本実施形態のケーシング１５には、図４に示すように、左右のモータ軸１１及び左右のカウンタ軸１２を区画する仕切壁１５ａが設けられる。モータ軸１１及びカウンタ軸１２の各一端側（車幅方向内側）を支持する軸受３１，３２は、仕切壁１５ａに固定されている。 As shown in FIG. 4, the casing 15 of the present embodiment is provided with a partition wall 15a for partitioning the left and right motor shafts 11 and the left and right counter shafts 12. The bearings 31 and 32 that support each one end side (inside in the vehicle width direction) of the motor shaft 11 and the counter shaft 12 are fixed to the partition wall 15a.

［２．潤滑・冷却構造］
ところで、各モータ１，２のロータ１Ｂ，２Ｂ及びステータ１Ｃ，２Ｃは作動に伴い発熱するため、冷却が必要である。また、各軸１１〜１３を支持する軸受３１〜３３や歯車機構３内の軸受３４〜３６は、滑らかに動作するために潤滑が必要である。したがって、駆動装置１０には、冷却及び潤滑のためのオイルを注入するための注入口１７ａを含む注入部１７と、注入されたオイルをモータ１，２や軸受３１〜３６に導くための経路４〜６と、オイルを貯留するための貯留部１８とが設けられる。[2. Lubrication / cooling structure]
By the way, the rotors 1B and 2B and the stators 1C and 2C of the motors 1 and 2 generate heat as they operate, and therefore need to be cooled. Further, the bearings 31 to 33 that support the shafts 11 to 13 and the bearings 34 to 36 in the gear mechanism 3 need to be lubricated in order to operate smoothly. Therefore, the drive device 10 has an injection unit 17 including an injection port 17a for injecting oil for cooling and lubrication, and a path 4 for guiding the injected oil to the motors 1 and 2 and the bearings 31 to 36. ~ 6 and a storage unit 18 for storing oil are provided.

図３に示すように、注入部１７は、ケーシング１５の上部に二つ設けられた筒状の部位であり、一端にオイルが注入される開口（入口）である注入口１７ａを有する。図４に示すように、注入部１７はケーシング１５に形成され、後述する第一経路４の内部空間４ａと連通する。各注入口１７ａから注入されたオイルは、各モータハウジング１Ｄ，２Ｄの内部及びケーシング１５の内部に供給される。 As shown in FIG. 3, the injection portion 17 is two cylindrical portions provided on the upper part of the casing 15, and has an injection port 17a at one end, which is an opening (inlet) into which oil is injected. As shown in FIG. 4, the injection portion 17 is formed in the casing 15 and communicates with the internal space 4a of the first path 4, which will be described later. The oil injected from each injection port 17a is supplied to the inside of each of the motor housings 1D and 2D and the inside of the casing 15.

図１に示すように、本実施形態の注入口１７ａは、二つのモータハウジング１Ｄ，２Ｄの間の空間（凹部１６内）に配置されており、凹部１６に形成された突起部に設けられる。なお、二つの注入口１７ａのうちの一方から注入されたオイルは第一モータ１側（左側）へ導かれ、他方から注入されたオイルは第二モータ２側（右側）へ導かれる。図１及び図４では、二つの注入部１７が紙面に直交する方向に二つ並設されている場合を例示しているが、二つの注入部１７が車幅方向に並設されていてもよい。 As shown in FIG. 1, the injection port 17a of the present embodiment is arranged in the space (inside the recess 16) between the two motor housings 1D and 2D, and is provided in the protrusion formed in the recess 16. The oil injected from one of the two injection ports 17a is guided to the first motor 1 side (left side), and the oil injected from the other is guided to the second motor 2 side (right side). In FIGS. 1 and 4, two injection portions 17 are arranged side by side in the direction orthogonal to the paper surface, but even if the two injection portions 17 are arranged side by side in the vehicle width direction. good.

図５に示すように、貯留部１８は、ケーシング１５の下部に設けられ、下方に落下してきたオイルを貯留する容器形状の部位である。貯留部１８には吸引口１９が設けられ、吸引口１９にはオイル通路（図示略）が接続される。吸引口１９は、貯留部１８内のオイルを外部のオイル通路に吸引するための開口である。オイル通路に吸引されたオイルは、オイル通路上に介装されたオイルポンプ及びオイルクーラ（何れも図示略）を介して再び注入口１７ａから注入される。 As shown in FIG. 5, the storage portion 18 is provided in the lower part of the casing 15 and is a container-shaped portion for storing the oil that has fallen downward. A suction port 19 is provided in the storage portion 18, and an oil passage (not shown) is connected to the suction port 19. The suction port 19 is an opening for sucking the oil in the storage portion 18 into the external oil passage. The oil sucked into the oil passage is injected again from the injection port 17a via an oil pump and an oil cooler (both not shown) interposed on the oil passage.

貯留部１８に貯留されるオイルの油面（液面）の高さ位置は、オイルの流れが停止したときに最も高くなり、オイルの循環中に最も低くなる。以下、油面の高さが最も高い位置を「最高油面Ｈ１」と呼び、油面の高さが最も低い位置を「最低油面Ｈ２」と呼ぶ。本実施形態の駆動装置１０では、図５中に破線で示すように、最高油面Ｈ１が出力軸１３の回転中心Ｃ３以上に設定される。また、図５中に点線で示すように、最低油面Ｈ２が吸引口１９よりも上方に設定される。 The height position of the oil level (liquid level) of the oil stored in the storage unit 18 is the highest when the oil flow is stopped and the lowest during the oil circulation. Hereinafter, the position where the oil level is the highest is referred to as "highest oil level H1", and the position where the oil level is the lowest is referred to as "lowest oil level H2". In the drive device 10 of the present embodiment, as shown by the broken line in FIG. 5, the maximum oil level H1 is set to the rotation center C3 or higher of the output shaft 13. Further, as shown by a dotted line in FIG. 5, the minimum oil level H2 is set above the suction port 19.

本実施形態の駆動装置１０では、オイルを導くための経路が大きく分けて三つ存在する。図１及び図４に示すように、第一経路４は、注入口１７ａから注入されたオイルを第一モータ１及び第二モータ２に導くための経路であり、おもに各モータ１，２のロータ１Ｂ，２Ｂ及びステータ１Ｃ，２Ｃを冷却する機能を持つ。第二経路５は、注入口１７ａから注入されたオイルを下方へ落とす経路であり、少なくとも動力伝達経路上に位置する歯車２１〜２４の一部にそのオイルを導く。 In the drive device 10 of the present embodiment, there are roughly three paths for guiding the oil. As shown in FIGS. 1 and 4, the first path 4 is a path for guiding the oil injected from the injection port 17a to the first motor 1 and the second motor 2, and is mainly a rotor of each of the motors 1 and 2. It has a function of cooling 1B, 2B and stators 1C, 2C. The second path 5 is a path for dropping the oil injected from the injection port 17a downward, and guides the oil to at least a part of the gears 21 to 24 located on the power transmission path.

第三経路６は、図１及び図５に示すように、歯車機構３に含まれる軸受３４〜３６にオイルを導くための経路であり、右側の第三経路６だけ二系統に分岐する。これらの経路４〜６はいずれも、駆動装置１０内の左右それぞれに設けられるが、図１ではわかりやすいように、右側の第一経路４と右側の第二経路５とを白抜き矢印で示す。また、左側の第三経路６と、右側の第三経路６のうちの一系統とを白抜き矢印で示す。なお、図４も同様に、右側の第一経路４と右側の第二経路５とを白抜き矢印で示し、左側の第一経路４及び左側の第二経路５は図示を省略する。 As shown in FIGS. 1 and 5, the third path 6 is a path for guiding oil to the bearings 34 to 36 included in the gear mechanism 3, and only the third path 6 on the right side branches into two systems. All of these paths 4 to 6 are provided on the left and right sides of the drive device 10, but for easy understanding in FIG. 1, the first path 4 on the right side and the second path 5 on the right side are indicated by white arrows. Further, the third path 6 on the left side and one of the third paths 6 on the right side are indicated by white arrows. Similarly, in FIG. 4, the first route 4 on the right side and the second route 5 on the right side are indicated by white arrows, and the first route 4 on the left side and the second route 5 on the left side are not shown.

図１に示すように、本実施形態の第一経路４は、モータ軸１１の内部空間と、第一モータ１及び第二モータ２の各回転軸１Ａ，２Ａの内部空間と、各回転軸１Ａ，２Ａにおける複数個所で放射状に穿孔された孔部４ｂとから構成される。本実施形態では、左のモータ軸１１と回転軸１Ａとが一体で設けられていることから、モータ軸１１の内部空間及び回転軸１Ａの内部空間も一体で（連通して）設けられる。以下、二つの内部空間を一つの空間とみなし、「内部空間４ａ」と呼ぶ。同様に、右のモータ軸１１と回転軸２Ａとが一体で設けられていることから、モータ軸１１の内部空間及び回転軸２Ａの内部空間も一体で（連通して）設けられる。この右側の二つの内部空間も一つの空間とみなし、「内部空間４ａ」と呼ぶ。 As shown in FIG. 1, the first path 4 of the present embodiment includes the internal space of the motor shaft 11, the internal space of the rotating shafts 1A and 2A of the first motor 1 and the second motor 2, and each rotating shaft 1A. , 2A is composed of holes 4b that are radially perforated at a plurality of locations. In the present embodiment, since the left motor shaft 11 and the rotating shaft 1A are integrally provided, the internal space of the motor shaft 11 and the internal space of the rotating shaft 1A are also provided integrally (in communication with each other). Hereinafter, the two internal spaces are regarded as one space and are referred to as "internal space 4a". Similarly, since the right motor shaft 11 and the rotating shaft 2A are integrally provided, the internal space of the motor shaft 11 and the internal space of the rotating shaft 2A are also provided integrally (in communication with each other). The two internal spaces on the right side are also regarded as one space and are called "internal space 4a".

各内部空間４ａの一端（車幅方向内側の端部）は各注入部１７の下端と連通して設けられ、各内部空間４ａの他端はモータハウジング１Ｄ，２Ｄ内において開放されている。孔部４ｂは、例えばロータ１Ｂ，２Ｂと接する位置において回転軸１Ａ，２Ａを径方向に貫通して設けられる。孔部４ｂは周方向に等間隔で複数配置されることが好ましい。例えば、９０度ずつ位相をずらした四箇所や、４５度ずつ位相をずらした八箇所に孔部４ｂが配置されることが好ましい。 One end of each internal space 4a (the end on the inner side in the vehicle width direction) is provided so as to communicate with the lower end of each injection unit 17, and the other end of each internal space 4a is open in the motor housings 1D and 2D. The hole portion 4b is provided so as to penetrate the rotating shafts 1A and 2A in the radial direction at a position in contact with the rotors 1B and 2B, for example. It is preferable that a plurality of holes 4b are arranged at equal intervals in the circumferential direction. For example, it is preferable that the hole portions 4b are arranged at four locations that are out of phase by 90 degrees or eight locations that are out of phase by 45 degrees.

各注入口１７ａから注入され、各注入部１７を通って各第一経路４の内部空間４ａに入り込んだオイルは、内部空間４ａを通ってモータハウジング１Ｄ，２Ｄの端面１ｅ，２ｅ側へ導かれる。このとき、回転軸１Ａ，２Ａが回転していれば、内部空間４ａ内のオイルは遠心力によって孔部４ｂ内に導かれ、ロータ１Ｂ，２Ｂ及びステータ１Ｃ，２Ｃに向かって放射状に散る。また、孔部４ｂ内に導かれなかったオイルは、内部空間４ａの他端からモータハウジング１Ｄ，２Ｄ内に流れ落ちる。 The oil injected from each injection port 17a and entering the internal space 4a of each first path 4 through each injection portion 17 is guided to the end faces 1e and 2e of the motor housings 1D and 2D through the internal space 4a. .. At this time, if the rotating shafts 1A and 2A are rotating, the oil in the internal space 4a is guided into the hole 4b by the centrifugal force and is radially dispersed toward the rotors 1B and 2B and the stators 1C and 2C. Further, the oil that is not guided into the hole 4b flows down from the other end of the internal space 4a into the motor housings 1D and 2D.

図４に示すように、第二経路５は、注入部１７の他端と第一経路４との境界部近傍に連通して設けられる。本実施形態の第二経路５は、注入口１７ａの下方においてケーシング１５の仕切壁１５ａ及びモータ軸１１の一端（車幅方向内側）により形成されたスリット部５ａから構成される。各注入口１７ａから注入され、各注入部１７を通って各第一経路４の内部空間４ａに入り込んだオイルの一部は、各スリット部５ａを通って下方に落下する。本実施形態では、第二経路５（スリット部５ａ）から下方に落下したオイルが、カウンタ軸１２上の第一中間歯車２２や軸受３１，３２等を潤滑し、さらに下方へと落下する。 As shown in FIG. 4, the second path 5 is provided so as to communicate with each other in the vicinity of the boundary portion between the other end of the injection portion 17 and the first path 4. The second path 5 of the present embodiment is composed of a partition wall 15a of the casing 15 and a slit portion 5a formed by one end (inside in the vehicle width direction) of the motor shaft 11 below the injection port 17a. A part of the oil that has been injected from each injection port 17a and has entered the internal space 4a of each first path 4 through each injection portion 17 falls downward through each slit portion 5a. In the present embodiment, the oil that has fallen downward from the second path 5 (slit portion 5a) lubricates the first intermediate gear 22 and the bearings 31, 32 and the like on the counter shaft 12, and further drops downward.

図５に示すように、第三経路６は、円筒部２４ｂを径方向に貫設した少なくとも一つの第一貫通孔６ａと、出力軸１３の外周面及び円筒部２４ｂの内周面の間で軸方向に延設された隙間６ｂとを含んで構成される。本実施形態の第三経路６は、出力軸１３を径方向に貫設した少なくとも一つの第二貫通孔６ｃと、出力軸１３の内部空間６ｄとをさらに含んで構成される。本実施形態の駆動装置１０では、右側の出力軸１３にだけ第二貫通孔６ｃが設けられる。なお、第一貫通孔６ａ及び第二貫通孔６ｃの軸方向位置は互いに略一致して設けられる。 As shown in FIG. 5, the third path 6 is formed between at least one first through hole 6a having a cylindrical portion 24b pierced in the radial direction, an outer peripheral surface of the output shaft 13, and an inner peripheral surface of the cylindrical portion 24b. It is configured to include a gap 6b extending in the axial direction. The third path 6 of the present embodiment is further configured to further include at least one second through hole 6c penetrating the output shaft 13 in the radial direction and an internal space 6d of the output shaft 13. In the drive device 10 of the present embodiment, the second through hole 6c is provided only on the output shaft 13 on the right side. The axial positions of the first through hole 6a and the second through hole 6c are provided so as to substantially coincide with each other.

第一貫通孔６ａは、出力歯車２４（出力軸１３）の回転が停止しているときに、貯留部１８を含むケーシング１５の下部に溜まったオイルを隙間６ｂに導くための連通口である。本実施形態の駆動装置１０では、第一貫通孔６ａが円筒部２４ｂの周方向に等間隔で複数箇所に形成されている。例えば、９０度ずつ位相をずらして四箇所に第一貫通孔６ａが形成される。これにより、オイルの流れが止まって油面が上昇した状態では、少なくとも一つの第一貫通孔６ａがオイル内に浸かることになるため、第一貫通孔６ａ内にオイルが入り込む。 The first through hole 6a is a communication port for guiding the oil accumulated in the lower part of the casing 15 including the storage portion 18 to the gap 6b when the rotation of the output gear 24 (output shaft 13) is stopped. In the drive device 10 of the present embodiment, the first through holes 6a are formed at a plurality of locations at equal intervals in the circumferential direction of the cylindrical portion 24b. For example, the first through holes 6a are formed at four locations with the phase shifted by 90 degrees. As a result, when the flow of oil is stopped and the oil level is raised, at least one first through hole 6a is immersed in the oil, so that the oil enters the first through hole 6a.

隙間６ｂは、第一貫通孔６ａに入り込んだオイルを、歯車機構３に含まれる軸受３４，３５に導く通路として機能する。すなわち、第一貫通孔６ａから隙間６ｂに導かれたオイルは、隙間６ｂを通じて一端側（車幅方向内側）に位置する軸受３４，３５に供給される。一方、第二貫通孔６ｃは、第一貫通孔６ａに入りこんだオイルを出力軸１３の内部空間６ｄに導くための連通口である。出力軸１３の内部空間６ｄに導かれたオイルは、一端側に（車幅方向内側）に位置する軸受３６に供給される。なお、第二貫通孔６ｃは、出力軸１３の周方向に等間隔で複数箇所に形成されており、例えば第一貫通孔６ａと同様に、９０度ずつ位相をずらして四箇所に配置される。 The gap 6b functions as a passage for guiding the oil that has entered the first through hole 6a to the bearings 34 and 35 included in the gear mechanism 3. That is, the oil guided from the first through hole 6a to the gap 6b is supplied to the bearings 34 and 35 located on one end side (inside in the vehicle width direction) through the gap 6b. On the other hand, the second through hole 6c is a communication port for guiding the oil that has entered the first through hole 6a to the internal space 6d of the output shaft 13. The oil guided to the internal space 6d of the output shaft 13 is supplied to the bearing 36 located on one end side (inside in the vehicle width direction). The second through holes 6c are formed at a plurality of locations at equal intervals in the circumferential direction of the output shaft 13, and are arranged at four locations with a phase shift of 90 degrees, for example, like the first through holes 6a. ..

［３．作用，効果］
（１）上述した駆動装置１０では、左右のモータ１，２及び歯車機構３を収容する収容ケーシング（モータハウジング１Ｄ，２Ｄ及びケーシング１５）内に注入されるオイルが、複数の経路を通じて各所に導かれる。上述した駆動装置１０には、注入口１７ａから注入されたオイルを左右のモータ１，２に導くための第一経路４と、注入口１７ａから注入されたオイルを下方へ落とし、歯車２１〜２４の少なくとも一部に導く第二経路５とが設けられる。このように、二系統のオイル導通路（第一経路４，第二経路５）を設けることで、効率良く左右のモータ１，２及び歯車機構３のそれぞれにオイルを供給できる。これにより、潤滑性能及び冷却性能を高めることができる。[3. Action, effect]
(1) In the drive device 10 described above, the oil injected into the accommodating casings (motor housings 1D, 2D and casing 15) accommodating the left and right motors 1 and 2 and the gear mechanism 3 is guided to various places through a plurality of paths. Be taken. In the drive device 10 described above, the first path 4 for guiding the oil injected from the injection port 17a to the left and right motors 1 and 2 and the oil injected from the injection port 17a are dropped downward to the gears 21 to 24. A second path 5 leading to at least a part of the above is provided. By providing the two oil conduction paths (first path 4, second path 5) in this way, oil can be efficiently supplied to each of the left and right motors 1 and 2 and the gear mechanism 3. Thereby, the lubrication performance and the cooling performance can be improved.

（２）上述した駆動装置１０では、二つのモータ１，２の回転軸１Ａ，２Ａ間にモータ軸１１が配置される（各モータ１，２から内方向にモータ軸１１が延びている）ため、二つのモータ１，２間であってモータ軸１１の上方に空間が生まれる。この空間に凹部１６を設け、この凹部１６にオイルを注入するための注入口１７ａが設けられるため、駆動装置１０の小型化を図ることができる。 (2) In the drive device 10 described above, the motor shaft 11 is arranged between the rotation shafts 1A and 2A of the two motors 1 and 2 (the motor shaft 11 extends inward from each of the motors 1 and 2). , A space is created above the motor shaft 11 between the two motors 1 and 2. Since the recess 16 is provided in this space and the injection port 17a for injecting oil is provided in the recess 16, the size of the drive device 10 can be reduced.

（３）上述した第一経路４には、回転軸１Ａ，２Ａの複数箇所において放射状に穿孔された孔部４ｂが含まれる。このため、上述した第一経路４では、注入口１７ａから注入されたオイルが内部空間４ａ内を通り、遠心力によって孔部４ｂ内に導かれて放射状に散ることで、ロータ１Ｂ，２Ｂ及びステータ１Ｃ，２Ｃに供給される。したがって、回転軸１Ａ，２Ａの遠心力を利用して、効率良く二つのモータ１，２にオイルを供給することができる。これにより、潤滑性能及び冷却性能を高めることができる。 (3) The above-mentioned first path 4 includes holes 4b that are radially perforated at a plurality of locations of the rotating shafts 1A and 2A. Therefore, in the above-mentioned first path 4, the oil injected from the injection port 17a passes through the internal space 4a, is guided into the hole 4b by the centrifugal force, and is dispersed radially, so that the rotors 1B and 2B and the stator are scattered. It is supplied to 1C and 2C. Therefore, oil can be efficiently supplied to the two motors 1 and 2 by utilizing the centrifugal force of the rotating shafts 1A and 2A. Thereby, the lubrication performance and the cooling performance can be improved.

（４）また、上述した第二経路５によれば、注入口１７ａの下方に設けられたスリット部５ａを通じてオイルを下方に落とすことができるため、重力を利用してオイルを歯車２１〜２４の少なくとも一部に導くことができる。これにより、潤滑性能及び冷却性能を高めることができる。 (4) Further, according to the second path 5 described above, the oil can be dropped downward through the slit portion 5a provided below the injection port 17a, so that the oil can be dropped on the gears 21 to 24 by using gravity. It can lead to at least a part. Thereby, the lubrication performance and the cooling performance can be improved.

（５）上述した駆動装置１０では、出力軸１３の一端側に歯車機構３が配置されるとともに、出力軸１３の外周面の一部に摺動可能に外嵌された円筒部２４ｂを有する出力歯車２４が設けられる。つまり、歯車機構３が位置するシャフトが部分的に二重構造となっている。さらに上述した駆動装置１０には、円筒部２４ｂの内周面と出力軸１３の外周面との間に軸方向に延在する隙間６ｂが設けられ、この隙間６ｂに連通するように円筒部２４ｂを径方向に貫通する第一貫通孔６ａが設けられる。そして、これらの第一貫通孔６ａ及び隙間６ｂを含む第三経路６により、歯車機構３に含まれる軸受（例えば軸受３４〜３６）にオイルが導かれるため、潤滑性能を高めることができる。 (5) In the drive device 10 described above, the gear mechanism 3 is arranged on one end side of the output shaft 13, and the output has a cylindrical portion 24b slidably fitted on a part of the outer peripheral surface of the output shaft 13. A gear 24 is provided. That is, the shaft on which the gear mechanism 3 is located has a partially double structure. Further, the drive device 10 described above is provided with a gap 6b extending in the axial direction between the inner peripheral surface of the cylindrical portion 24b and the outer peripheral surface of the output shaft 13, and the cylindrical portion 24b communicates with the gap 6b. A first through hole 6a is provided to penetrate the through hole 6a in the radial direction. Then, oil is guided to the bearings (for example, bearings 34 to 36) included in the gear mechanism 3 by the third path 6 including the first through hole 6a and the gap 6b, so that the lubrication performance can be improved.

（６）さらに、上述した第三経路６には、出力軸１３を径方向に貫通した第二貫通孔６ｃが設けられるため、第二貫通孔６ｃを通じて出力軸１３の内部空間６ｄに入り込んだオイルも、歯車機構３の軸受（例えば軸受３４〜３６）に導くことができる。これにより、潤滑性能をより高めることができる。 (6) Further, since the second through hole 6c that penetrates the output shaft 13 in the radial direction is provided in the third path 6 described above, the oil that has entered the internal space 6d of the output shaft 13 through the second through hole 6c. Can also be guided to the bearing of the gear mechanism 3 (for example, bearings 34 to 36). This makes it possible to further improve the lubrication performance.

（７）また、上述した駆動装置１０では、貯留部１８に溜まるオイルの最高油面Ｈ１が出力軸１３の回転中心Ｃ３以上に設定されており、第一貫通孔６ａが円筒部２４ｂの周方向に等間隔で複数箇所に形成される。これにより、オイルの流れが止まって油面が上昇した状態では、少なくとも一つの第一貫通孔６ａがオイル内に浸かることになるため、第一貫通孔６ａ内にオイルが入り込み、隙間６ｂへとオイルが導かれる。したがって、歯車機構３の軸受（例えば軸受３４〜３６）の潤滑性能をより高めることができる。なお、出力軸１３の回転が止まった状態で油面が上昇し、第一貫通孔６ａ及び隙間６ｂを通じて歯車機構３の軸受３４〜３６へオイルが導かれると、車両始動時に軸受（例えば軸受３４〜３６）が十分に潤滑されていることから、始動時の潤滑性能も高めることができる。 (7) Further, in the drive device 10 described above, the maximum oil level H1 of the oil accumulated in the storage portion 18 is set at the rotation center C3 or higher of the output shaft 13, and the first through hole 6a is in the circumferential direction of the cylindrical portion 24b. It is formed in multiple places at equal intervals. As a result, when the flow of oil is stopped and the oil level is raised, at least one first through hole 6a is immersed in the oil, so that the oil enters the first through hole 6a and enters the gap 6b. Oil is guided. Therefore, the lubrication performance of the bearings of the gear mechanism 3 (for example, bearings 34 to 36) can be further improved. When the oil level rises while the rotation of the output shaft 13 is stopped and the oil is guided to the bearings 34 to 36 of the gear mechanism 3 through the first through hole 6a and the gap 6b, the bearing (for example, the bearing 34) is started when the vehicle is started. Since ~ 36) is sufficiently lubricated, the lubrication performance at the time of starting can be improved.

（８）上述した駆動装置１０では、貯留部１８に溜まるオイルの最低油面Ｈ２が、貯留部１８に設けられた吸引口１９よりも上方に設定されることから、吸引口１９に空気が入り込むことを防止できる。これにより、正常にオイルを流通させることができるため、潤滑性能及び冷却性能を高めることができる。 (8) In the drive device 10 described above, since the minimum oil level H2 of the oil accumulated in the storage unit 18 is set above the suction port 19 provided in the storage unit 18, air enters the suction port 19. Can be prevented. As a result, the oil can be circulated normally, so that the lubrication performance and the cooling performance can be improved.

［４．変形例］
上述した駆動装置１０の構成は一例であって、上述したものに限られない。例えば、側面視で、カウンタ軸１２がモータ軸１１と出力軸１３とを結ぶ直線Ｌよりも上方に配置されてもよいし、二つの中間歯車２２，２３の一部がモータ１，２と重ならないようにカウンタ軸１２が配置されてもよい。また、出力歯車２４がモータ１，２と重ならないように出力軸１３が配置されてもよいし、二つの中間歯車２２，２３の配置が上記と逆（大径の第一中間歯車２３がモータ１，２側に）配置されてもよい。[4. Modification example]
The configuration of the drive device 10 described above is an example, and is not limited to that described above. For example, in side view, the counter shaft 12 may be arranged above the straight line L connecting the motor shaft 11 and the output shaft 13, and a part of the two intermediate gears 22 and 23 overlaps with the motors 1 and 2. The counter shaft 12 may be arranged so as not to become. Further, the output shaft 13 may be arranged so that the output gear 24 does not overlap with the motors 1 and 2, and the arrangement of the two intermediate gears 22 and 23 is opposite to the above (the large diameter first intermediate gear 23 is the motor). It may be arranged (on the 1st and 2nd sides).

上述した駆動装置１０では、左右のモータ１，２の間に各モータ軸１１が配置されるように左右のモータ１，２が互いに離隔して対向配置されているが、モータ１，２の配置はこれに限られない。例えば、左右のモータ１，２の車幅方向外側に、モータ軸１１及びカウンタ軸１２が配置されてもよい。なお、駆動装置１０内に配置される歯車２１〜２４は一例であって、例えば中間歯車２２，２３の一方を省略し、他方にモータ歯車２１及び出力歯車２４が噛合する構成としてもよいし、歯車２１〜２４以外の歯車が設けられて三段以上の減速ギヤ列が構成されてもよい。 In the drive device 10 described above, the left and right motors 1 and 2 are arranged so as to be separated from each other so that the motor shafts 11 are arranged between the left and right motors 1 and 2, but the motors 1 and 2 are arranged. Is not limited to this. For example, the motor shaft 11 and the counter shaft 12 may be arranged outside the left and right motors 1 and 2 in the vehicle width direction. The gears 21 to 24 arranged in the drive device 10 are examples, and for example, one of the intermediate gears 22 and 23 may be omitted, and the motor gear 21 and the output gear 24 may be meshed with the other. Gears other than the gears 21 to 24 may be provided to form a reduction gear train having three or more stages.

上述した第一経路４，第二経路５，第三経路６の構成は一例である。例えば、放射状に穿孔される孔部４ｂを軸方向に複数配置してもよいし、スリット部５ａを複数箇所に形成してもよい。第一経路４は、注入口１７ａから注入されたオイルを二つのモータ１，２に導く構成であればよく、孔部４ｂを含むものに限られない。また、第二経路５は、注入口１７ａから注入されたオイルを下方へ落とし、動力伝達経路上に位置する歯車の一部に導く構成であればよく、スリット部５ａを含むものに限られない。また、歯車機構３に含まれる軸受（例えば軸受３４〜３６）に対して、第一経路４や第二経路５からオイルを導くことができれば、第三経路６の第二貫通孔６ｃを省略してもよいし、第三経路６自体を省略してもよい。なお、カウンタ軸１２及び出力軸１３は中空形状でなくてもよい。 The configuration of the first route 4, the second route 5, and the third route 6 described above is an example. For example, a plurality of holes 4b that are radially perforated may be arranged in the axial direction, or slit portions 5a may be formed at a plurality of locations. The first path 4 may be configured to guide the oil injected from the injection port 17a to the two motors 1 and 2, and is not limited to the one including the hole 4b. Further, the second path 5 may be configured to drop the oil injected from the injection port 17a downward and guide it to a part of the gears located on the power transmission path, and is not limited to the one including the slit portion 5a. .. Further, if oil can be guided from the first path 4 and the second path 5 to the bearings (for example, bearings 34 to 36) included in the gear mechanism 3, the second through hole 6c of the third path 6 is omitted. Alternatively, the third route 6 itself may be omitted. The counter shaft 12 and the output shaft 13 do not have to have a hollow shape.

上述したケーシング１５の形状や注入口１７ａの配置は特に限られない。例えば、ケーシング１５が一体ものではなく分割構造であってもよいし、凹部１６を省略してもよい。注入口１７ａは、少なくとも収容ケース（ケーシング１５，モータハウジング１Ｄ，２Ｄ）の上部に設けられていればよい。なお、上記の駆動装置１０では、二つのモータハウジング１Ｄ，２Ｄとケーシング１５とが連結されて一つの収容ケースを構成する場合を例示したが、収容ケースの構成はこれに限られない。また、オイルの最高油面Ｈ１及び最低油面Ｈ２が上述した高さ以外に設定されていてもよい。なお、ジョイント部１４が、モータ１，２の各端面１ｅ，２ｅよりも車幅方向内側に位置するように出力軸１３の車幅方向寸法が設定されていてもよい。 The shape of the casing 15 and the arrangement of the injection port 17a described above are not particularly limited. For example, the casing 15 may have a divided structure instead of being integrated, or the recess 16 may be omitted. The inlet 17a may be provided at least above the housing case (casing 15, motor housing 1D, 2D). In the above-mentioned drive device 10, the case where the two motor housings 1D and 2D and the casing 15 are connected to form one accommodation case is illustrated, but the configuration of the accommodation case is not limited to this. Further, the maximum oil level H1 and the minimum oil level H2 of the oil may be set to heights other than those described above. The dimension of the output shaft 13 in the vehicle width direction may be set so that the joint portion 14 is located inside the end faces 1e and 2e of the motors 1 and 2 in the vehicle width direction.

１ 第一モータ
１Ａ 回転軸
１Ｄ モータハウジング（収容ケース）
２ 第二モータ
２Ａ 回転軸
２Ｄ モータハウジング（収容ケース）
３ 歯車機構
４ 第一経路
４ｂ 孔部
５ 第二経路
５ａ スリット部
６ 第三経路
６ａ 第一貫通孔
６ｂ 隙間
６ｃ 第二貫通孔
１０ 駆動装置（左右輪駆動装置）
１１ モータ軸
１３ 出力軸
１５ ケーシング（収容ケース）
１６ 凹部
１７ａ 注入口
１８ 貯留部
１９ 吸引口
２１ モータ歯車（歯車）
２２ 第一中間歯車（歯車）
２３ 第二中間歯車（歯車）
２４ 出力歯車（歯車）
２４ｂ 円筒部
３１，３２，３３，３４，３５，３６ 軸受
Ｃ１，Ｃ２，Ｃ３ 回転中心
Ｈ１ 最高油面
Ｈ２ 最低油面1 First motor 1A Rotating shaft 1D Motor housing (accommodation case)
2 Second motor 2A Rotating shaft 2D motor housing (accommodation case)
3 Gear mechanism 4 1st path 4b hole 5 2nd path 5a Slit 6 3rd path 6a 1st through hole 6b Gap 6c 2nd through hole 10 Drive device (left and right wheel drive device)
11 Motor shaft 13 Output shaft 15 Casing (accommodation case)
16 Recess 17a Injection port 18 Reservoir 19 Suction port 21 Motor gear (gear)
22 First Intermediate Gear (Gear)
23 Second Intermediate Gear (Gear)
24 Output gear (gear)
24b Cylindrical part 31,32,33,34,35,36 Bearings C1, C2, C3 Rotation center H1 Highest oil level H2 Lowest oil level

Claims (8)

車両の左右輪を駆動する第一モータ及び第二モータと、前記第一モータ及び前記第二モータのトルク差を増幅して前記左右輪の各々に伝達する歯車機構とを具備する左右輪駆動装置において、
前記第一モータ及び前記第二モータが互いに離隔して対向配置され、前記歯車機構が前記第一モータ及び前記第二モータよりも下方に配置されるとともに、
前記第一モータ，前記第二モータ及び前記歯車機構を収容する収容ケースと、
前記第一モータ及び前記第二モータの間であって前記収容ケースの上部に設けられ、前記収容ケース内にオイルを注入するための注入口と、
前記注入口から注入された前記オイルを前記第一モータ及び前記第二モータに導くための第一経路と、
前記注入口から注入された前記オイルを下方へ落とし、少なくとも前記第一モータ及び前記第二モータから前記左右輪への動力伝達経路上に位置する歯車の一部に前記オイルを導くための第二経路と、を備えた
ことを特徴とする、左右輪駆動装置。A left-right wheel drive device including a first motor and a second motor for driving the left and right wheels of a vehicle, and a gear mechanism for amplifying a torque difference between the first motor and the second motor and transmitting the torque difference to each of the left and right wheels. In
The first motor and the second motor are arranged so as to be separated from each other and face each other, the gear mechanism is arranged below the first motor and the second motor, and the gear mechanism is arranged below the first motor and the second motor.
A housing case for accommodating the first motor, the second motor, and the gear mechanism,
An injection port provided above the storage case between the first motor and the second motor and for injecting oil into the storage case.
A first path for guiding the oil injected from the injection port to the first motor and the second motor,
A second for dropping the oil injected from the inlet and guiding the oil to at least a part of the gears located on the power transmission path from the first motor and the second motor to the left and right wheels. Left and right wheel drive unit, characterized by having a route. 前記第一モータ及び前記第二モータの各回転軸が同軸に配置されているとともに、
前記各回転軸と同軸上かつ前記各回転軸間に位置するモータ軸と、
前記第一モータ及び前記第二モータの間であって前記モータ軸の上方に位置し、前記収容ケースの内方向へ凹設された凹部と、を備え、
前記注入口は、前記凹部に設けられている
ことを特徴とする、請求項１記載の左右輪駆動装置。The rotation axes of the first motor and the second motor are arranged coaxially, and
A motor shaft coaxial with each of the rotation shafts and located between the rotation shafts,
It is provided with a recess located between the first motor and the second motor and above the motor shaft and recessed inward in the housing case.
The left and right wheel drive device according to claim 1, wherein the injection port is provided in the recess. 前記第一経路は、前記第一モータ及び前記第二モータの中空状の前記各回転軸における複数個所で放射状に穿孔された孔部を含む
ことを特徴とする、請求項２記載の左右輪駆動装置。The left and right wheel drive according to claim 2, wherein the first path includes holes radially drilled at a plurality of positions in the hollow rotary shafts of the first motor and the second motor. Device. 前記第二経路は、前記注入口の下方において前記収容ケースと前記モータ軸の一端とにより形成されたスリット部を含む
ことを特徴とする、請求項２又は３記載の左右輪駆動装置。The left and right wheel drive device according to claim 2 or 3, wherein the second path includes a slit portion formed by the accommodating case and one end of the motor shaft below the injection port. 一端側に前記歯車機構が配置され、他端側に前記左右輪の一方が配置された出力軸と、
前記動力伝達経路上に位置し、前記出力軸の外周面の一部に摺動可能に外嵌される円筒部を有する出力歯車と、
前記円筒部を径方向に貫設した少なくとも一つの第一貫通孔と、前記出力軸の前記外周面及び前記円筒部の内周面の間で軸方向に延設された隙間とを含み、前記歯車機構に含まれる軸受に前記オイルを導くための第三経路と、を備えた
ことを特徴とする、請求項１〜４のいずれか１項に記載の左右輪駆動装置。An output shaft in which the gear mechanism is arranged on one end side and one of the left and right wheels is arranged on the other end side.
An output gear located on the power transmission path and having a cylindrical portion slidably fitted onto a part of the outer peripheral surface of the output shaft.
It includes at least one first through hole penetrating the cylindrical portion in the radial direction and a gap extending in the axial direction between the outer peripheral surface of the output shaft and the inner peripheral surface of the cylindrical portion. The left and right wheel drive device according to any one of claims 1 to 4, wherein the bearing included in the gear mechanism is provided with a third path for guiding the oil. 前記出力軸は、中空円筒状に形成され、
前記第三経路は、前記出力軸を径方向に貫設した少なくとも一つの第二貫通孔を含む
ことを特徴とする、請求項５記載の左右輪駆動装置。The output shaft is formed in a hollow cylindrical shape.
The left and right wheel drive device according to claim 5, wherein the third path includes at least one second through hole penetrating the output shaft in the radial direction. 前記収容ケースの下部に設けられ、前記オイルを貯留する貯留部を備え、
前記オイルの流れが停止したときの最高油面が前記出力軸の回転中心以上に設定されており、
前記第一貫通孔が、前記円筒部の周方向に等間隔で複数箇所に形成されている
ことを特徴とする、請求項５又は６記載の左右輪駆動装置。Provided at the bottom of the storage case and provided with a storage section for storing the oil.
The maximum oil level when the oil flow is stopped is set above the center of rotation of the output shaft.
The left and right wheel drive device according to claim 5, wherein the first through holes are formed at a plurality of locations at equal intervals in the circumferential direction of the cylindrical portion. 前記収容ケースの下部に設けられ、前記オイルを貯留する貯留部と、
前記貯留部に形成され、前記オイルを外部に吸引するための吸引口と、を備え、
前記オイルの循環中における最低油面が、前記吸引口よりも上方に設定されている
ことを特徴とする、請求項１〜７のいずれか１項に記載の左右輪駆動装置。A storage unit provided at the bottom of the storage case and storing the oil,
A suction port formed in the storage portion for sucking the oil to the outside is provided.
The left and right wheel drive device according to any one of claims 1 to 7, wherein the lowest oil level in the circulation of the oil is set above the suction port.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0165978U (en) * 1987-10-22 1989-04-27
JPH11240349A (en) * 1998-02-24 1999-09-07 Honda Motor Co Ltd Vihicular starting assist device
JP2017133564A (en) * 2016-01-26 2017-08-03 Ntn株式会社 Vehicular motor drive device
JP2018034713A (en) * 2016-09-01 2018-03-08 Ntn株式会社 In-wheel motor drive device
JP2018054053A (en) * 2016-09-30 2018-04-05 Ntn株式会社 Vehicle drive device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0165978U (en) * 1987-10-22 1989-04-27
JPH11240349A (en) * 1998-02-24 1999-09-07 Honda Motor Co Ltd Vihicular starting assist device
JP2017133564A (en) * 2016-01-26 2017-08-03 Ntn株式会社 Vehicular motor drive device
JP2018034713A (en) * 2016-09-01 2018-03-08 Ntn株式会社 In-wheel motor drive device
JP2018054053A (en) * 2016-09-30 2018-04-05 Ntn株式会社 Vehicle drive device

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