| 摘要 |
<p>A centrifugal advance mechanism wherein the degree of advance of the output shaft of the mechanism relative to the input shaft of the mechanism increases, as a result of smoothly increasing speed, in a stepwise manner, the mechanism including a first plate (13) rotatable with the input shaft (11) and a second plate (18) rotatable relative to both the input shaft (11) and the output shaft (12). A cam member (21) is coupled to the output shaft (12) to rotate therewith, and is engaged by centrifugal weights pivoted on the first shaft (11). A first tension spring (26) acts between the input shaft and the output shaft to urge the output shaft to a rest position, and a second tension spring (27) acts between the output shaft (12) and the second plate (18) to urge the second plate (18) to a rest position relative to the output shaft (12). The second plate (18) and the first plate (13) include co-acting abutment means (29, 15) to limit movement of the second plate (18) with the output shaft (12) relative to the input shaft (11). Before co-operation of the abutment means (15, 29) the shaft (12) is moved relative to the shaft (11) against the action of the spring (26), whereas after co-operation of the abutment means (15, 29) movement of the shaft (12) relative to the shaft (11) takes place against the combined action of the springs (26,27.)</p> |
