Piaggio&c. S.p.a.

Giacomo Freschi

Walter Mariotti

Paolo Nesti

Matteo Puccioni

A continuously variable transmission device () for a two-wheel, three-wheel or four-wheel motorcycle includes a cam system () operating between a fixed bushing () and a mobile bushing (). The device is configured to obstruct the approach between the active surfaces () or to facilitate the approach of the active surfaces.

Continuously variable transmission device with a device for varying the gear shift curve

A CVT transmission device () comprises a drive pulley () provided with a mobile bushing (), a fixed bushing (), a cam system () comprising at least one driven cam portion () of mobile bushing () and a cam portion () of the fixed bushing (). The mobile bushing () comprises a main wall () annular with respect to the axis of rotation (X), having an inner surface () which delimits a housing compartment () and said driven cam portion () protrudes radially internally from said inner surface (). The drive cam portion () of the fixed bushing () is suitable to penetrate axially in said housing compartment of the mobile bushing ().

Continuously variable transmission device with device for varying the transmission curve

A continuously variable transmission device () for a two-, three- or four-wheel motorcycle comprises a gear shift regulation device provided with a slide () axially slidable and suitable to engage special rollers () to hold them during the gear shift. A mobile bushing () is suitable to influence the slide () to cause its translation from a rearward position to a forward limit position to engage the special rollers ().

Continuously variable transmission device with gear regulation device

A continuously variable transmission device () for a two-wheel, three-wheel or four-wheel motorcycle includes a gear shift regulation device suitable to operate on special rollers () through an adjustable axial action independently of the number of engine revolutions. The device influences the centrifugal movement of the rollers () and thus influences the gear shift.

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Pisa, Italy

Giacomo Freschi