Patent ID: 9683638
Date: 2017-06-20
CPC Classifications: F16H,Y10T

Claim:
1. A continuously variable gear transmission comprising: a housing; an input shaft connected to an input disc; an output shaft connected to an output disc; a plurality of traction balls each having a radius (r) and being distributed radially around the input and output discs; a rotatable pre-spanning ring, said traction balls each being mounted for rotation around a rotation axis, the angle of the rotation axes being controlled for controlling the transmission ratio of the gear transmission, said traction balls having three-point contact with the input disc, the output disc, and the pre-spanning ring, respectively, the pre-spanning ring being mounted axially displaceable and having a curvature of the surface in contact with the traction balls, said curvature being larger than the radius (r) of the traction balls; and a disengagement mechanism for disengaging the input disc from the traction balls, the disengagement being performed with the transmission in a low gearing position, the disengagement mechanism comprising ramps provided on an iris plate, said ramps forcing the input disc to a position out of engagement with the traction balls.