Continuously variable transmission appartus

A continuously variable transmission apparatus, comprising:

• an input shaft;
• a toroidal-type continuously variable transmission disposed concentrically with the input shaft, including an input portion and an output portion and using the input shaft as the input portion thereof;
• a rotation transmission shaft disposed in parallel to the input shaft;
• first, second and third planetary-gear-type transmissions disposed concentrically with each other on the periphery of the rotation transmission shaft;
• the first planetary-gear-type transmission including a first sun gear, a first ring gear, a plurality of first planetary gears meshingly engaged with the first sun and ring gears, and a first carrier supporting the respective first planetary gears so as to be rotated;
• the second planetary-gear-type transmission including a second sun gear, a second ring gear, a plurality of second planetary gears meshingly engaged with the second sun and ring gears, and a second carrier supporting the respective second planetary gears so as to be rotated;
• the third planetary-gear-type transmission including a third sun gear, a third ring gear, a plurality of third planetary gears meshingly engaged with the third sun and ring gears, and a third carrier supporting the respective third planetary gears so as to be rotated;
• an output gear disposed concentrically with the rotation transmission shaft;
• a first power transmission mechanism for transmitting the rotation of the input shaft to the first carrier constituting the first planetary-gear-type transmission;
• a second power transmission mechanism for transmitting the rotation between the output portion of the toroidal-type continuously variable transmission and the rotation transmission shaft;
• a third power transmission mechanism for transmitting the rotation of the input shaft to the third ring gear constituting the third planetary-gear-type transmission;
• a low-speed clutch for permitting and prohibiting the transmission of the power between the input shaft and the first planetary-gear-type transmission;
• and,
• a high-speed clutch for permitting and prohibiting the transmission of the power between the input shaft and the third carrier,
• wherein the second and third sun gears are rotated together with the rotation transmission shaft, the first and second ring gears constituting the first and second planetary- gear-type transmissions respectively are connected with each other, the second carrier constituting the second planetary-gear-type transmission is connected with not only the output shaft but also the third ring gear constituting the third planetary-gear-type transmission, and, in a state where the low-speed clutch is connected and the connection of the high-speed clutch is cut off, in accordance with the control of the transmission ratio of the toroidal-type continuously variable transmission, the output shaft is stopped while the input shaft is rotating.