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  • Summary & Details

Motor Bearing Rattle in Electric Powertrains (First Report) Mechanism Investigation by Dynamic Analysis of the Motor and Reduction Gear Shafts

電動パワートレインのモータベアリング打音 (第1報)モータと減速機のシャフト挙動解析によるメカニズム解明

Detailed Information

Author(J)1) 近藤 慎平, 2) 小林 大介, 3) 中谷 貴典, 4) 井田 徹, 5) 浅原 康之, 6) 児島 剛, 7) 松尾 宏
Author(E)1) Shinpei Kondo, 2) Daisuke Kobayashi, 3) Takanori Nakatani, 4) Tooru Ida, 5) Yasuyuki Asahara, 6) Tsuyoshi Kozima, 7) Hiroshi Matsuo
Affiliation(J)1) 日産自動車, 2) 日産自動車, 3) 日産オートモーティブテクノロジー, 4) 日産自動車, 5) 日産自動車, 6) 日産自動車, 7) 日産自動車
Affiliation(E)1) Nissan Motor, 2) Nissan Motor, 3) Nissan Automotive Technology, 4) Nissan Motor, 5) Nissan Motor, 6) Nissan Motor, 7) Nissan Motor
Abstract(J)電気自動車では電動パワートレインの異音が顕在化しやすいが,そのメカニズムが明確になっていない.本報ではモータベアリング打音に着目し,動解析と実機検証から,その発生メカニズムは,ギヤ反力で傾いたモータシャフトの振れ回り軌跡がベアリングのラジアルガタ内を通過するときにガタ打ちする現象であることを示した.

Translation

Abstract(E)Although abnormal noise in electric powertrains is easily detected in electric vehicles, its underlying mechanism remains unclear. This paper focuses on knocking noise from motor bearings and, based on dynamic simulations and validation on an actual powertrain, shows that the knocking phenomenon occurs when the radial runout trajectory of the motor shaft, tilted by gear reaction forces, passes through the bearing's radial clearance.

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