US 6,206,801 B1Granted

Continuously variable transmission

AssigneeNsk Ltd.

InventorsKoji Ishikawa, Hiroyuki Ito, Hisashi Machida, Nobuo Goto, Makoto Fujinami, Hiroshi Kato

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Abstract

A continuously variable transmission provided with a rotary shaft characterized in that a ball spline is formed between an inner peripheral surface of a first disc and an outer peripheral surface of an intermediate portion of a rotary shaft, a restraining members for limiting displacement of balls of a ball spline is provided on an inner side of the inner peripheral surface of the first disc, a small-diametered portion is formed on the outer peripheral surface of the intermediate portion of the rotary shaft and between the first disc and a second disc, and the restraining members is mountable through the small-diametered portion with the restraining members and the small-diametered portion axially aligned with each other.

Claims16

Dependent claims

A continuously variable transmission, comprising a rotary shaft, a first disc supported around an intermediate portion of said rotary shaft for axial movement relative thereto but against rotation relative to said rotary shaft, a second disc supported for rotation relative to said rotary shaft with an inner side thereof opposed to an inner side of said first disc, a trunnion rockable about a pivot axis transverse to said rotary shaft, a power roller mounted to said trunnion and held between the inner sides of said first and second discs, and a loading-cam pressing device operative to rotatively drive said first disc while pressing said first disc toward said second disc,

characterized in that a ball spline is formed between an inner peripheral surface of said first disc and an outer peripheral surface of the intermediate portion of said rotary shaft, a restraining device limiting displacement of balls of said ball spline is provided toward an inner axial end of said first disc and include a restraining member mounted to the inner peripheral surface of said first disc, a small-diametered portion is formed on an outer peripheral surface of the intermediate portion of said rotary shaft between said first and second discs, and
said small-diametered portion and said first are arranged such that said restraining member is mountable to the inner peripheral surface of said first disc by insertion bet ween said small-diametered portion and said inner peripheral surface of said first disc, with a mounting position of said restraining member and said small-diametered portion aligned with each other along an axis of said rotary shaft.

A pre-assembled input side disc unit for use in assembling a continuously variable transmission, comprising an input shaft having a flange portion on one axial end portion thereof, a cam plate supported on an inner side of said flange portion and having an inner side formed as a drive side cam surface, an input side disc having an outer side opposed to said drive side cam surface formed as a driven side cam surface and having an axially opposite inner side formed as a concave surface having an arcuate cross-sectional shape, said input side disc being supported toward one end of said input shaft for axial displacement relative to said input shaft but against rotation relative to said input shaft, a plurality of rollers held between said drive side cam surface and said driven side cam surface, and a holder holding said plurality of rollers for rolling,

characterized in that said input side disc is supported around said input shaft through a ball spline having a plurality of balls inserted between a first ball spline groove formed in an inner peripheral surface of said input side disc and a second ball spline groove formed in an outer peripheral surface of said input shaft, a restraining device limiting displacement of balls of said ball spline is provided toward an inner axial end of said first disc and includes a restraining member mounted to the inner peripheral surface of said first disc, a small-diametered portion is formed on an outer peripheral surface of the intermediate portion of said input shaft between said first and second discs, and
said small-diametered a portion and said first disc are arranged such that said restraining member is mountabled to the inner peripheral surface of said first disc by insertion between said small-diametered portion and said inner peripheral surface of said first disc, with a mounting position of said restraining member and said small-diametered portion aligned with each other along an axis of said input shaft.

Dependencies are inferred from the claim text.