Toroidal continuously variable transmission

摘要

The present invention provides a toroidal continuously variable transmission capable of reducing loss which occurs at a bearing and achieving range-widening at low cost with easy disc machinability.;In the toroidal continuously variable transmission, a bearing ring 100 of a ball bearing 6 is formed at a small end surface 3a of an inner disc 3. Further, at least a part of the bearing ring 100 is axially overlapped with a traction surface 12 which is a boundary surface between a power roller and the inner disc 3. Further, a position adjustment member 120 is inserted between support posts 8a, 8b and a bearing ring facing to the disc 3 (the other bearing ring of the ball bearing 6 opposed to the bearing ring 100 of the small end surface 3a).

主权项

1. A toroidal continuously variable transmission, comprising:
a casing; a rotary shaft which is rotatably supported in the casing; a pair of outer discs which is supported at both end portions of the rotary shaft rotatably as being synchronized with the rotary shaft in a state that respective axial-direction one-side surfaces each having an arc-shaped section are mutually opposed; an inner disc which is supported at a periphery of a middle portion of the rotary shaft as being rotatable relatively to the rotary shaft in a state that axial-direction two-side surfaces each having an arc-shaped section are opposed respectively to the axial-direction one-side surfaces of the outer discs; support members which are arranged by two or more respectively between the axial-direction two-side surface of the inner disc and the axial-direction one-side surface of each of the outer discs with respect to the axial direction as being swingable about pivot shafts located at twisted positions relatively to the rotary shaft; and power rollers which are rotatably supported respectively by the support members, each power roller including a peripheral surface as a spherically-shaped convex surface, as having the peripheral surface contacted to the axial-direction two-side surface of the inner disc and the axial-direction one-side surface of each of the outer discs, wherein a small end face of the inner disc is rotatably supported by ball bearings to a fixing member which is fixed to an inner surface of the casing, and a bearing ring of the ball bearing is formed at the small end surface of the inner disc and at least a part of the bearing ring is axially overlapped with a traction surface which is a boundary surface between the power roller and the inner disc.