Toroidal continuously variable transmission

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;
• A) an inner wheel orbital face formed on the inner wheel,
• B) an outer wheel orbital face formed on the outer wheel, and
• C) 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 first contact width being made between one of the following while a second contact width greater than the first contact width being made between the other of the following:
• a) the rolling element and the inner wheel orbital face, and
• b) the rolling element and the outer wheel orbital face.

A power roller for a toroidal continuously variable transmission, the power roller comprising:

• i) an inner wheel for transmitting a power of an input disc (3, 4) to an output disc,
• ii) an outer wheel held with a 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;
• A) an inner wheel orbital face formed on the inner wheel,
• B) an outer wheel orbital face formed on the outer wheel, and
• C) 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 first contact being made between one of the following while a second contact being made between the other of the following:
• a) the rolling element and the inner wheel orbital face, and
• b) the rolling element and the outer wheel orbital face.

A power roller for a toroidal continuously variable transmission, the power roller comprising:

• i) an inner wheel for transmitting a power of an input disc (3, 4) to an output disc,
• ii) an outer wheel held with a 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;
• A) an inner wheel orbital face formed on the inner wheel,
• B) an outer wheel orbital face formed on the outer wheel, and
• C) 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 first contact width being made between one of the following while a second contact width greater than the first contact width being made between the other of the following:
• a) the rolling element and the inner wheel orbital face, and
• b) the rolling element and the outer wheel orbital face.