Bicycle generator hub stator having annular member and three yokes, and bicycle generator hub

摘要

A bicycle generator hub stator has a hub shaft, an annular member and three yokes. The annular member includes a first axial end, a second axial end and a through hole extending between the first and second axial ends. The hub shaft extends through the through hole. The first and second yokes are non-rotatably arranged relative to the annular member. The third yoke is non-rotatably connected to both the annular member and the hub shaft. The first yoke includes a first extended section that extends in an axial direction from the first axial end to the second axial end of the annular member. The second yoke includes a second extended section that extends in the axial direction from the second axial end to the first axial end of the annular member. The third yoke is disposed in the through hole and magnetically couples the first and second yokes together.

主权项

1. A bicycle generator hub stator comprising:
a hub shaft having an axial groove formed as a second recess in an outer circumferential surface of the hub shaft, the axial groove extending in an axial direction from one axial end of the hub shaft toward the other axial end of the hub shaft such that the axial groove ends at a middle portion of the hub shaft; an annular member including a first axial end, a second axial end and a through hole extending between the first and second axial ends, the hub shaft extending through the through hole such that the middle portion of the hub shaft is disposed inside the through hole of the annular member; a first yoke including a first extended section that extends in the axial direction from the first axial end to the second axial end of the annular member and a first insertion section that extends in the axial direction from the first axial end toward the second axial end of the annular member to be inserted into the through hole of the annular member, the first yoke being non-rotatably arranged relative to the annular member; a second yoke including a second extended section that extends in the axial direction from the second axial end to the first axial end of the annular member and a second insertion section that extends in the axial direction from the second axial end toward the first axial end of the annular member to be inserted into the through hole of the annular member, the second yoke being non-rotatably arranged relative to the annular member; and a third yoke disposed in the through hole and nonrotatably connected to both the annular member and the hub shaft, the third yoke being disposed axially between tip ends of the first and second insertion sections and magnetically coupling the first and second yokes together, the third yoke having a second protrusion arranged in the axial groove at the middle portion of the hub shaft, the third yoke being a separate piece from the hub shaft, the annular member, the first yoke, and the second yoke with a maximum axial length of the third yoke being smaller than a maximum axial length of the through hole.