| 摘要 |
<p>A bicycle crankset for mounting a plurality of chainrings (43, 44, 45) includes a crank arm (50) having a first end for mounting a pedal (40) and a second end having a boss (55) for mounting to a crank axle (46), a chainring retainer (51) for supporting at least one of the plurality of chainrings, and a reinforcement member (52). The chainring retainer (51) has a first engagement member (68) for engaging the boss (55), and the reinforcement member (52) includes a second engagement member (61) for engaging the boss (55). The chainring retainer (51) preferably includes a first centre ring (65) defining the first engagement member (68) and a plurality of first arms (66) extending radially outwardly from the first centre ring. Similarly, the reinforcement member (52) preferably includes a second centre ring (62) defining the second engagement member (61) and a plurality of second arms (63) extending radially outwardly from the second centre ring. The distal ends of the plurality of first arms (66) may be attached to corresponding distal ends of the plurality of second arms (63). Alternatively, the chainring retainer (51) may have a first peripheral ring (67) disposed at distal ends of the plurality of first arms (66), and the reinforcement member (52) may have a second peripheral ring (64) disposed at distal ends of the plurality of second arms (63). The first peripheral ring (67) may be secured to the second peripheral ring (64) over a part or whole circumference thereof. To provide good balance of the crankset, the plurality of first arms (66) may be offset from the plurality of second arms (63) by a half-pitch in the circumferential direction. <IMAGE></p> |
