| CPC B62M 1/36 (2013.01) [B62M 9/105 (2013.01); B62M 2009/007 (2013.01)] | 22 Claims |
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1. A crank assembly for a human-powered vehicle, the crank assembly comprising:
a crank arm having an axially outwardly facing crank-surface and an axially inwardly facing crank-surface provided on a reverse side of the axially outwardly facing crank-surface in an axial direction with respect to a rotational center axis of the crank assembly, the axially inwardly facing crank-surface being configured to face toward an axial center plane of the human powered vehicle in the axial direction in a mounted state where the crank assembly is mounted to the human powered vehicle;
a front sprocket unit having an axially outwardly facing sprocket-surface and an axially inwardly facing sprocket-surface provided on a reverse side of the axially outwardly facing sprocket-surface in the axial direction, the axially inwardly facing sprocket-surface being configured to face toward the axial center plane of the human powered vehicle in the axial direction in the mounted state, the front sprocket unit including:
a sprocket body; and
a plurality of sprocket teeth extending radially outwardly from the sprocket body in a radial direction with respect to the rotational center axis; and
at least one chain-drop control protrusion configured to inhibit a drive chain from getting into a space provided radially inwardly from the at least one control protrusion and between the crank arm and the front sprocket unit in the axial direction, the at least one chain-drop control protrusion being configured to be provided to at least one of the axially inwardly facing crank-surface of the crank arm and the axially outwardly facing sprocket-surface of the front sprocket unit, the at least one chain-drop control protrusion having a through bore, an entirety of the at least one chain-drop control protrusion is disposed radially inwardly from an outermost tip of the plurality of sprocket teeth.
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