| 摘要 |
PROBLEM TO BE SOLVED: To provide a new structure requiring no chain guard without an advantage of a notch chain, concerning a wheel for a chain transmission device.SOLUTION: A chain has a bottom surface opening structure between a pair of platy portions 38 of a link, can be driven by engaging a sprocket tooth from a bottom surface opening portion of the link 16, and is equipped with notches 50 on a link bottom surface so as to enable the engagement with driving pins 62. A wheel disposes the driving pins 62 at equal intervals in a circumferential direction with the same pitch as a chain pitch between a pair of driving pin supporting plates 57 and 58. Between the driving pin supporting plates 57 and 58, sprocket disc 60 is disposed, and on an outer peripheral side of the driving pins 62, tooth portions 60A of the same pitch as the chain pitch are provided. The tooth portions 60A is engaged with barrels 44 of the chain, and simultaneously, the driving pins 62 are engaged with the notches 50 of the chain. |
