# US 7,465,249 B2 · Toroidal type continuously variable transmission

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- Number: US 7,465,249 B2
- Document ID: US7465249B2
- Status: Granted
- Kind: B2
- Application number: 11/258,516
- Filed: 2005-10-26
- Published: 2006-06-08
- Granted: 2008-12-16
- Earliest claimed: 2004-10-26
- Assignees: Nsk Ltd.
- Inventors: Hiroki Nishii; Eiji Inoue
- Web page: https://patentgrep.com/patent/US7465249B2

## CPC

- F16H 15/38: with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces
- F16H: GEARING

## Abstract

A toroidal type continuously variable transmission has an input shaft to which a rotation torque is input, an input side disk and an output side disk that are concentrically and rotatably supported by the input shaft in a state that an inner peripheral surface of the input side disk opposes to an inner peripheral surface of the output side disk, a power roller held between the input side disk and the output side disk and a hydraulic loading device applying predetermined pressing force so that the power roller is pressed between the input and output side disks. Fine grooves are formed on at least a radially inner part of the inner peripheral surface of the input side disk and at least radially outer part of the inner peripheral surface of the output side disk, respectively.

## Claims

### Claim 1

A toroidal type continuously variable transmission comprising:
an input shaft to which a rotation torque is input;
an input side disk and an output side disk that are concentrically and rotatably supported by the input shaft in a state that an inner peripheral surface of the input side disk opposes to an inner peripheral surface of the output side disk;
a power roller held between the input side disk and the output side disk; and
a hydraulic loading device applying predetermined pressing force so that the power roller is pressed between the input side disk and the output side disk,
wherein fine grooves are formed on at least a radially inner part of the inner peripheral surface of the input side disk and at least a radially outer part of the inner peripheral surface of the output side disk, respectively.

### Claim 2

A toroidal type continuously variable transmission apparatus comprising:
a toroidal type continuously variable transmission comprising:
an input shaft to which a rotation torque is input;
an input side disk and an output side disk that are concentrically and rotatably supported by the input shaft in a state that an inner peripheral surface of the input side disk opposes to an inner peripheral surface of the output side disk;
a power roller held between the input side disk and the output side disk; and
a hydraulic loading device applying predetermined pressing force so that the power roller is pressed between the input side disk and the output side disk; and
a planetary gear transmission unit adopted to switch a pluralities of speed mode,
wherein fine grooves are formed on around speed mode changing areas of respective the inner peripheral surfaces of the input side disk and the output side disk, and
wherein the speed mode switching areas contact with the power roller when the planetary gear transmission unit switches the speed mode.

### Claim 3 (depends on 2)

The toroidal type continuously variable transmission apparatus as set forth in claim 2, wherein the fine grooves are formed on a radial outer part of the inner peripheral surface of the input side disk and on a radial inner part of the inner peripheral surface of the output side disk, respectively.

### Claim 4 (depends on 2)

The toroidal type continuously variable transmission apparatus as set forth in claim 2, wherein the planetary gear transmission unit is connected with the input side disk and the output side disk.

### Claim 5 (depends on 1)

The toroidal type continuously variable transmission as set forth in claim 1, wherein depth of the fine groove is 1 μm or more and 10 μm or less.

### Claim 6 (depends on 1)

The toroidal type continuously variable transmission as set forth in claim 1, wherein pitch of the fine grooves is 100 μm or more and 300 μm or less.

### Claim 7 (depends on 2)

The toroidal type continuously variable transmission apparatus as set forth in claim 2, wherein depth of the fine groove is 1 μm or more and 10 μm or less.

### Claim 8 (depends on 2)

The toroidal type continuously variable transmission apparatus as set forth in claim 2, wherein pitch of the fine grooves is 100 μm or more and 300 μm or less.