Patent ID: 6832971
Filing Date: 2004-12-21
Classification: F16C,F16H

Abstract:
A toroidal continuously variable transmission comprising:1) a first input disc formed with a toroidal groove; 2) a second input disc formed with a toroidal groove; 3) an output disc formed with: a first toroidal groove opposed to the toroidal groove of the first input disc, and a second toroidal groove opposed to the toroidal groove of the second input disc; 4) a trunnion; and 5) a plurality of power rollers each of which is interposed in one of the positions including the following: I) between a wall of the toroidal groove of the first input disc and a wall of the first toroidal groove of the output disc, and II) between a wall of the toroidal groove of the second input disc and a wall of the second toroidal groove of the output disc, each of the power rollers being gyratorily held with the trunnion, each of the power rollers comprising: i) an inner wheel for transmitting a power of one of the first input disc and the second input disc to the output disc, ii) an outer wheel held with the trunnion, and iii) a power roller bearing for bearing the inner wheel in such a manner that the inner wheel rotates relative to the outer wheel, the power roller bearing comprising: â€ƒA) an inner wheel orbital face formed on the inner wheel, â€ƒB) an outer wheel orbital face formed on the outer wheel, and â€ƒC) a rolling element interposed between the inner wheel orbital face and the outer wheel orbital face, the rolling element being shaped substantially into a frustum of a cone, a point contact being made between one of the following while a line contact being made between the other of the following: â€ƒa) the rolling element and the inner wheel orbital face, and â€ƒb) the rolling element and the outer wheel orbital face.