PROBLEM TO BE SOLVED: To provide a pedal depression type bicycle drive device for enabling a powerful start and a smooth acceleration although it is light and compact and low in manufacture cost because of a simple construction, and a three-wheel bicycle having the drive device and excellent in a running stability and a turning property.SOLUTION: In a bicycle drive device, in which a drive member is rocked on a crank shaft by a step-in operation of a pedal so that a transmission member is wound on the outer circumference side face part of the crankshaft thereby to generate a drive power, the outer peripheral shape of the wind-up part of the drive member is generally shaped into an arcuate shape, and the rocking radius from that rocking center to an outer peripheral face part is formed to become gradually larger from the wind starting side to the wind ending side.SELECTED DRAWING: Figure 1
【課題】 シンプルな構造のため軽量コンパクトで製造コストが低廉でありながら、力強い発進と円滑な加速を可能とするペダル踏み込み式の自転車用駆動装置、及びこれを備え走行安定性と旋回性に優れる三輪自転車を提供する。【解決手段】 ペダルの踏み込み操作により駆動部材がクランク軸を中心に揺動してその外周側面部に伝達部材が巻き上げられ駆動力を発生する自転車用駆動装置において、駆動部材の巻き上げ部分の外周形状が略円弧形状であり、その揺動中心から外周側面部までの揺動半径が、巻き始め側から巻き終わり側に向かって徐々に大きくなるように形成されている。【選択図】 図1
BICYCLE DRIVE DEVICE, AND THREE-WHEEL BICYCLE HAVING THE DEVICE
自転車用駆動装置及びこれを備えた三輪自転車
2017-01-19
Patent
Elektronische Ressource
Japanisch
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