Prorauta

Petri Erkki Michael Makkonen

Pekka Hautala

Seppo Lauri Paalasmaa

A planetary gear transmission with a steplessly adjustable transmission ratio where the gear transmission comprises a first and second sun gear ( ) arranged on a first and second operating shaft ( ), and first ( ) and second planetary gears ( ) connectable thereto, each of which sun gears is rigidly attached by a shaft ( ) to the first planetary gears ( ), so that the first and second planetary gears form planetary gear pairs (B ). The gear transmission includes only one planetary carrier ( ). By means of coupling means ( ), the whole rotary force or part thereof is taken out of the planetary gear and/or fed therein, either via said first or second operating shaft ( ), or via an alternative planetary carrier. By using at least one operation means ( ), the planetary carrier rotation velocity (&phgr;) is controlled to remain locked stationary or to be freely rotatable.

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Helsinki, Finland

Petri Erkki Michael Makkonen