JPS6426061A - Pulley for v-belt transmission - Google Patents

Abstract

PURPOSE:To inhibit hindrance from being caused to power transmission by forming a sectional form of a driving side pulley so as to make the widening degree at the more radial outside than a contact position with a V-belt at the time of equal velocity larger than that at the radial inside. CONSTITUTION:When a transmission ratio is up to 1, namely, less than the equal velocity, it acts in the same manner as in the past. At the time of accelerating in the range that the transmission ratio exceeds 1, even if travel of a movable pulley 2a of a driving side pulley 2 is the same value as a conventional device, a turning radius of a V-belt 5 in a contact state with the driving side pulley 2 becomes smaller than in case of the conventional device, and an increased rate of rotational frequency of a driven side pulley 4 to the travel of the movable pulley 2a at the driving side pulley 2 becomes lessened. Consequently, a sudden increase in the rotational frequency of the driven side pulley 4 is checked, and since it is increased at a constant rate, a sudden increase of load to a driving source is eliminated, so that smooth power transmission is carried out to a driven accessory from the driving source.