Patent ID: 9279475
Filing Date: 2016-03-08
CPC Classification: F16G,F16H

Claim Text:
1. An element for a metallic belt used in a belt-type continuously variable transmission, the belt-type continuously variable transmission including: a drive pulley and a driven pulley each of which has a pulley groove defined by a fixed pulley half and a movable pulley half; and a belt including an element and wound around the pulley groove of each of the drive pulley and the driven pulley, a constant-angle inclined generatrix portion in which a generatrix is inclined at a constant angle to widen the pulley groove radially outward being formed on a radial inner side of a region of a surface of contact, with the element, of at least the fixed pulley half out of the fixed pulley half and the movable pulley half, a curved generatrix portion in which the generatrix is curved to gradually increase an inclination angle while widening the pulley groove radially outward being formed on a radial outer side of the region of the surface of contact, the belt-type continuously variable transmission configured to change a gear ratio by: moving the movable pulley half of one pulley out of the drive pulley and the driven pulley away from the fixed pulley half of the pulley to increase a width of the pulley groove of the pulley; and moving the movable pulley half of the other pulley out of the drive pulley and the driven pulley closer to the fixed pulley half of the other pulley to decrease a width of the pulley groove of the other pulley, a belt radial outer portion of a side edge of the element of the belt that contacts the drive pulley and the driven pulley is linearly shaped to follow the constant-angle inclined generatrix portion, and a belt radial inner portion of the side edge of the element is a curved shape curved to taper radially inward to gradually increase an inclination angle, and when the element contacts the constant-angle inclined generatrix portion, the element is in line contact with the radial outer side portion which is linearly shaped, and when the element contacts the curved generatrix portion, the element is in point contact with the radial inner side portion which is curved.