Continuously variable transmission

A continuously variable transmission configured to transmit a rotational driving force of one pulley to another pulley by a driving-force transmitting medium wound between the two pulleys wherein each of the two pulleys is configured to vary a groove width thereof,

• the continuously variable transmission comprising:
• an engagement-receiving portion provided to the driving-force transmitting medium on a side of the driving-force transmitting medium on which the driving-force transmitting medium is wound on the pulleys;
• and
• a movable engaging portion provided to a shaft portion of at least one of the two pulleys, wherein the movable engaging portion is movable in a radial direction of the shaft portion to protrude from and escape into the shaft portion, wherein the movable engaging portion is configured to protrude from the shaft portion to engage with the engagement-receiving portion at least one of when a pulley-ratio region is in a setting for highest speed and when the pulley-ratio region is in a setting for lowest speed,
• wherein the engagement-receiving portion is formed as a concave portion having an inclined surface, and the moveable engaging portion is formed with an inclined surface for contact with the inclined surface of the concave portion,
• wherein the movable engaging portion is configured to move in the radial direction of the shaft portion to generate a slope friction force between the inclined surface of the concave portion of the driving-force transmitting medium and the inclined surface of the moveable engaging portion to thereby reduce a slip rate between the driving-force transmitting medium and the at least one of the two pulleys, when a pulley-ratio region between the two pulleys is larger than the setting for highest speed, and
• wherein the movable engaging portion is configured to engage with the driving-force transmitting medium to prevent the at least one of the two pulleys and the driving-force transmitting medium from slipping on each other and/or from approaching slipping on each other, when the pulley-ratio region is in the setting for highest speed.