Patent ID: 6527671
Filing Date: 2003-03-04
Classification: F16H,Y10T

Abstract:
A planetary gear transmission with a variable transmission ratio, without a ring gear wheel, including:a first sun gear arranged on a first operating shaft and at least one first planetary gear connectable thereto; a second sun gear arranged on a second operating shaft and at least one second planetary gear connectable thereto; planetary shafts rigidly attaching each of the second planetary gears to one of the first planetary gears, in which case the first and second planetary gears form first planetary gear pairs, where the planetary gears rotate at the same angular velocity; and a planetary carrier common to the first and second planetary gears; the planetary gear transmission comprising, as a combination:at least one coupling means for taking out at least some rotary force from the planetary gear transmission, and/or for feeding the rotary force into the planetary gear transmission, via said first or second operating shaft, or via the planetary carrier; and at least one operation means for controlling the rotation velocity of the planetary carrier at least to a first mode, where the planetary carrier is locked to be stationary, and to a second mode, where the planetary carrier is freely rotable, wherein said coupling means are ring toothings of the planetary carrier with respective countergear wheels, or direct couplings; and said operation means are steplessly braking and accelerating mechanisms, by means of which the rotation velocity of the planetary carrier is controlled between any of the velocities: a zero velocity, and the same velocity as that of the first operating shaft in a first direction, and a higher velocity than that of the first operating shaft in said first direction, and other velocity in an opposite second direction.