PROBLEM TO BE SOLVED: To provide a bicycle speed change gear capable of appropriately changing the gear ratio and a bicycle assist system equipped with the speed change gear.SOLUTION: A bicycle speed change gear comprises a setting mechanism for setting shifting paths in transmission mechanisms that includes a first speed change mechanism and transmit rotation from an input body to an output body at gear ratios of three or more steps. The transmission mechanisms establish a first shifting path for transmitting the rotation at one of first and second gear ratios via speed change with the first speed change mechanism, and a second shifting path for transmitting the rotation at a greater gear ratio than the first and second gear ratios via speed change with a speed change mechanism different from the first speed change mechanism. The first shifting path includes a first planetary shifting path that is via speed change with a first planetary mechanism and is not via speed change with a second planetary mechanism, and a second planetary shifting path that is not via speed change with the first planetary mechanism and is via speed change with the second planetary mechanism. The setting mechanism sets the transmission mechanisms not to go through speed change with the first planetary mechanism in the second sifting path.SELECTED DRAWING: Figure 3
【課題】好適に変速比を変更できる自転車用変速機およびこの変速機を備える自転車用アシストシステムを提供する。【解決手段】自転車用変速機は第1変速機構を含み入力体からの回転を3段階以上の変速比で出力体に伝達する伝達機構における変速経路を設定する設定機構を備え、伝達機構は第1変速機構での変速を経由して第1変速比および第2変速比の一方で出力体に伝達する第1変速経路および第1変速経路において経由される変速機構とは異なる変速機構での変速を経由して第1変速比および第2変速比よりも大きい変速比で出力体に伝達する第2変速経路を形成し、第1変速経路は第1遊星機構での変速を経由し第2遊星機構での変速を経由しない第1遊星変速経路および第1遊星機構での変速を経由せず第2遊星機構での変速を経由する第2遊星変速経路を含み、設定機構は第2変速経路において第1遊星機構での変速を経由しないように伝達機構を設定する。【選択図】図3
BICYCLE SPEED CHANGE GEAR AND BICYCLE ASSIST SYSTEM WITH THE SAME
自転車用変速機およびこれを備える自転車用アシストシステム
2018-08-30
Patent
Elektronische Ressource
Japanisch
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