PROBLEM TO BE SOLVED: To miniaturize a power unit for an electric power-assisted vehicle, the power unit having new structure in which a first one-way clutch between a hub case and a speed change ring gear and a second one-way clutch between the speed change gear and a speed change carrier are arranged in series on the speed change ring gear at positions which are shifted axially from each other.SOLUTION: A speed change mechanism part T comprises: a speed change sun gear 23 capable of being switched between a fixed state and a relatively rotatable state relative to a hub shaft 11; a speed change carrier 22 to which pedal effort is input; a first one-way clutch C1 transmitting power from a speed change ring gear 25 only to the side of the hub case H; a second one-way clutch C2 interposed between a carrier extension part 22Ba and the speed change ring gear 25 and transmitting power from the carrier extension part only to the side of the speed change ring gear; and a hub supporting bearing B2 between the carrier extension part and hub case H, at least a part of the bearing B2 being located at the axially same position as at least a part of the second one-way clutch C2.SELECTED DRAWING: Figure 1
【課題】電動補助車両用動力ユニットにおいて、ハブケース及び変速リングギヤ間の第1ワンウェイクラッチと、変速リングギヤ及び変速キャリア間の第2ワンウェイクラッチとが、互いに軸方向にずれた位置で変速リングギヤ上に直列配置される新規構造に関連して動力ユニットの小型化を図る。【解決手段】変速機構部Tは、ハブ軸11に対し固定状態と相対回転可能状態とに切換え可能な変速サンギヤ23と、踏力が入力される変速キャリア22と、変速リングギヤ25からハブケースH側へのみ動力伝達する第1ワンウェイクラッチC1と、キャリア延出部22Baと変速リングギヤ25間に介装されてキャリア延出部から変速リングギヤ側へのみ動力伝達する第2ワンウェイクラッチC2と、キャリア延出部とハブケースH間のハブ支持用軸受B2とを備え、軸受B2の少なくとも一部が第2ワンウェイクラッチC2の少なくとも一部と軸方向で同一位置にある。【選択図】 図1
POWER UNIT FOR ELECTRIC POWER-ASSISTED VEHICLE
電動補助車両用動力ユニット
2018-10-11
Patent
Elektronische Ressource
Japanisch
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