초록 ▼

A toroidal-type continuously variable transmission has a casing; a rotary shaft; a pair of outside disks each including an axial-direction one-side surface and supported on the rotary shaft so as to be rotated in synchronization with the rotary shaft; an inside disk including axial-direction two-sid

A toroidal-type continuously variable transmission has a casing; a rotary shaft; a pair of outside disks each including an axial-direction one-side surface and supported on the rotary shaft so as to be rotated in synchronization with the rotary shaft; an inside disk including axial-direction two-side surfaces and rotatably supported on the periphery of the middle portion of the rotary shaft so as to be rotated with respect to the rotary shaft; support members disposed between the one side axial-direction surface and the axial-direction one-side surface so as to be swung and shifted about pivot shafts thereof; power rollers rotatably supported on the support members, the peripheral surface of the power rollers being contacted with the axial-direction two-side surface and the axial-direction one-side surface; and ball bearings for supporting the inside disk in such a manner that the inside disk is rotated with respect to the casing.

대표청구항 ▼

What is claimed is: 1. A continuously variable transmission comprising: a casing; a rotary shaft rotatably supported in an interior of the casing; a pair of outside disks each including an axial-direction one-side surface having an arc-shaped section and supported on the rotary shaft so as to be ro

What is claimed is: 1. A continuously variable transmission comprising: a casing; a rotary shaft rotatably supported in an interior of the casing; a pair of outside disks each including an axial-direction one-side surface having an arc-shaped section and supported on the rotary shaft so as to be rotated in synchronization with the rotary shaft, the respective axial-direction one-side surfaces being opposed to each other; an inside disk including axial-direction two-side surfaces each having an arc-shaped section and rotatably supported on the periphery of the middle portion of the rotary shaft so as to be rotated with respect to the rotary shaft, the axial-direction two-side surfaces being opposed to the axial-direction one-side surfaces of the two outside disks; support members disposed by two or more respectively between the one side axial-direction surface of the inside disk and the axial-direction one-side surface of the out side disk with respect to the axial direction of the toroidal-type continuously variable transmission so as to be swung and shifted about pivot shafts disposed on the two end portions thereof; power rollers each including a peripheral surface formed as a spherical-shaped convex surface, the power rollers respectively being rotatably supported on the support members, the peripheral surface of the power rollers being contacted with the axial-direction two-side surface of the inside disk and the axial-direction one-side surface of the outside disk; ball bearings having inner and outer races, with a preload applied thereto, for supporting the inside disk in such a manner that the inside disk is rotated with respect to the casing, and a member fixed to the inner surface of the casing, wherein the inside disk includes axial-direction two end portions and the ball bearings are thrust bearings which support the member fixed to the inner surface of the casing in such a manner that the member is rotated with respect to small-diameter side of the end portion of the inside disk; the thrust bearings are interposed between a retaining portion and the axial-direction two end portions; and a plurality of projecting strips extending from the outer bearing races and fitted to an inner surface of the retaining portion, and a plurality of projecting strips extending from the inner bearing races and fitted to the arc shaped portion of the inside disk. 2. The continuously variable transmission as set forth in claim 1, wherein the ball bearings are thrust angular ball bearings. 3. The continuously variable transmission as set forth in claim 1, wherein the inside disk is an integrally-formed output side disk, the outside disks are a pair of input side disks, an output gear is disposed on the outer peripheral edge portion of the output side disk, the middle portion of the rotary shaft is inserted through the inside-diameter side of the output side disk in such a manner that the output side disk is shifted in the axial direction thereof, the pair of input side disks are supported on the rotary shaft so as to be rotated in synchronization with the rotary shaft, one of the input side disks is supported on one end portion of the rotary shaft so as to be shifted in the axial direction thereof, and a pressing device for pressing against the one input side disk toward the other input side disk is disposed. 4. The continuously variable transmission as set forth in claim 1, wherein the inside disk is formed as a monolith. 5. The continuously variable transmission as set forth in claim 1, wherein the thrust bearings support the inside disk in an axial direction of the rotary shaft. 6. A continuously variable transmission apparatus comprising a combination of a continuously variable transmission unit and a planetary-gear transmission unit, and further comprising an input shaft connected to a rotary shaft of the continuously variable transmission unit and an output shaft connected to components of the planetary-gear transmission unit, a continuously variable transmission as the continuously variable transmission unit comprises: a casing; a rotary shaft rotatably supported in the interior of the casing; a pair of outside disks each including an axial-direction one-side surface having an arc-shaped section and rotatably supported on two ends of the rotary shaft so as to be rotated in synchronization with the rotary shaft, the respective axial-direction one-side surfaces being opposed to each other; an inside disk including axial-direction two-side surfaces each having an arc-shaped section and rotatably supported on the periphery of the middle portion of the rotary shaft so as to be rotated with respect to the rotary shaft, the axial-direction two-side surfaces being opposed to the axial-direction one-side surfaces of the two outside disks; support members disposed by two or more respectively between the one side axial-direction surface of the inside disk and the axial-direction one-side surface of the outside disk so as to be swung and shifted about pivot shafts disposed at positions twisted with respect to the rotary shaft; power rollers each including a peripheral surface formed as a spherical-shaped convex surface, the power rollers respectively being rotatably supported on the support members, the peripheral surfaces of the power rollers being contacted with the axial-direction surface of the inside disk and the axial-direction one-side surface of the outside disk; and, ball bearings having inner and outer races, with a preload applied thereto, for supporting the inside disk in such a manner that the inside disk is rotated with respect to the casing, and a member fixed to the inner surface of the casing, wherein the inside disk includes axial-direction two end portions and the ball bearings are thrust bearings which support the member fixed to the inner surface of the casing in such a manner that the member is rotated with respect to small-diameter side of the end portion of the inside disk, wherein the planetary-gear transmission unit includes switch unit for receiving power from the rotary shaft and the inside disk of the continuously variable transmission unit and also for switching the transmission passage of the power into two systems; the thrust bearings are interposed between a retaining portion and the axial-direction two end portions; and a plurality of projecting strips extending from the outer bearing races and fitted to an inner surface of the retaining portion, and a plurality of projecting strips extending from the inner bearing races and fitted to the arc shaped portion of the inside disk. 7. The continuously variable transmission apparatus as set forth in claim 6, wherein the inside disk is formed as a monolith. 8. The continuously variable transmission as set forth in claim 6, wherein the thrust bearings support the inside disk in an axial direction of the rotary shaft. 9. A continuously variable transmission apparatus comprising a combination of a continuously variable transmission unit and a planetary-gear transmission unit, and further comprising an input shaft connected to a rotary shaft of the continuously variable transmission unit and an output shaft connected to components of the planetary-gear transmission unit, a continuously variable transmission as the continuously variable transmission unit comprises: a casing; a rotary shaft rotatably supported in the interior of the casing; a pair of outside disks each including an axial-direction one-side surface having an arc-shaped section and rotatably supported on two ends of the rotary shaft so as to be rotated in synchronization with the rotary shaft, the respective axial-direction one-side surfaces being opposed to each other; an inside disk including axial-direction two-side surfaces each having an arc-shaped section and rotatably supported on the periphery of the middle portion of the rotary shaft so as to be rotated with respect to the rotary shaft, the axial-direction two-side surfaces being opposed to the axial-direction one-side surfaces of the two outside disks; support members disposed by two or more respectively between the one side axial-direction surface of the inside disk and the axial-direction one-side surface of the outside disk so as to be swung and shifted about pivot shafts disposed at positions twisted with respect to the rotary shaft; power rollers each including a peripheral surface formed as a spherical-shaped convex surface, the power rollers respectively being rotatably supported on the support members, the peripheral surfaces of the power rollers being contacted with the axial-direction surface of the inside disk and the axial-direction one-side surface of the outside disk; and, ball bearings for supporting the inside disk in such a manner that the inside disk is rotated with respect to the casing, wherein the planetary-gear transmission unit includes switch unit for receiving power from the rotary shaft and the inside disk of the continuously variable transmission unit and also for switching the transmission passage of the power into two systems, wherein the planetary-gear transmission unit comprises: a carrier concentrically connected and fixed to the pair of output side disks of the continuously variable transmission unit so as to be rotated together with the two output side disks; a plurality of first planetary gears rotatably supported on one of the axial-direction two-side surfaces of the carrier opposed to one of the outside disks; a first sun gear meshingly engaged with the first planetary gears; a plurality of second planetary gears rotatably supported on the other side surface of the carrier; a second sun gear rotatably disposed so as to be concentric with the disks, the second sun gear being meshingly engaged with the second planetary gears; a ring gear rotatably disposed so as to be concentric with the disks, the ring gear being meshingly engaged with the first planetary gears; and, wherein the switch unit selects a first mode for transmitting power taken out from the inside disk through the ring gear to the output shaft and a second mode for transmitting power taken out from the inside disk through the second sun gear to the output shaft.