# US 2017/0284518 A1 · Speed increaser

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- Number: US 2017/0284518 A1
- Document ID: US20170284518A1
- Status: Published application
- Kind: A1
- Application number: 15/462,247
- Filed: 2017-03-17
- Published: 2017-10-05
- Earliest claimed: 2016-03-31
- Assignees: Kabushiki Kaisha Toyota Jidoshokki
- Applicants: Kabushiki Kaisha Toyota Jidoshokki
- Inventors: Ryosuke FUKUYAMA; Kaho TAKEUCHI
- Web page: https://patentgrep.com/patent/US20170284518A1

## CPC

- F16H 13/08: with balls or with rollers acting in a similar manner
- F04D 17/10: for compressing or evacuating
- F04D 25/028: {the driving means being a planetary gear}
- F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence)
- F16H 13/06: with members having orbital motion
- F16H: GEARING
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A speed increaser includes an annular peripheral wall rotatable with a rotation of the low-speed shaft, a high-speed shaft disposed within the peripheral wall and having a rotation axis extending in the same direction as that of the peripheral wall, and three rollers disposed within the peripheral wall and in contact with both the peripheral wall and the high-speed shaft. The three rollers are disposed at different positions along the rotation axis of the high-speed shaft with rotation axes of the three rollers extending in the same direction as the rotation axis of the high-speed shaft, and the rotation axes of the three rollers are spaced in a circumferential direction of the high-speed shaft. The three rollers are disposed so that at least part of contact areas between the high-speed shaft and the rollers is free from overlapping with each other along the rotation axis of the high-speed shaft.

## Claims

### Claim 1

A speed increaser comprising:
an annular peripheral wall disposed coaxially with a low-speed shaft and rotatable with a rotation of the low-speed shaft;
a high-speed shaft disposed within the peripheral wall and having a rotation axis extending in the same direction as a rotation axis of the peripheral wall; and
three rollers disposed within the peripheral wall and in contact with both the peripheral wall and the high-speed shaft,
wherein the three rollers are disposed at different positions along the rotation axis of the high-speed shaft with rotation axes of the three rollers extending in the same direction as the rotation axis of the high-speed shaft, and the rotation axes of the three rollers are spaced in a circumferential direction of the high-speed shaft, and
wherein the three rollers are disposed so that at least part of contact areas between the high-speed shaft and the rollers is free from overlapping with each other along the rotation axis of the high-speed shaft.

### Claim 2 (depends on 1)

The speed increaser according to claim 1, wherein the rotation axis of the high-speed shaft is offset from a rotation axis of the low-speed shaft and the rotation axis of the peripheral wall, wherein the three rollers include at least one fixed roller and at least one movable roller that is movable with the rotation of the peripheral wall, and wherein the movable roller is arranged to move in a direction in which a force applied from the peripheral wall and the high-speed shaft to the movable roller increases with the rotation of the peripheral wall rotated by the rotation of the low-speed shaft.

### Claim 3

An electric compressor comprising:
an electric motor driving to rotate a low-speed shaft;
a speed increaser including a high-speed shaft and transmitting a rotation of the low-speed shaft to the high-speed shaft, and
a compression part connected to the high-speed shaft and compressing a fluid with a rotation of the high-speed shaft,
wherein the speed increaser includes an annular peripheral wall disposed coaxially with the low-speed shaft and rotatable with a rotation of the low-speed shaft, the high-speed shaft disposed within the peripheral wall and having a rotation axis extending in the same direction as a rotation axis of the peripheral wall, and three rollers disposed within the peripheral wall and in contact with both the peripheral wall and the high-speed shaft,
wherein the three rollers are disposed at different positions along the rotation axis of the high-speed shaft with rotation axes of the three rollers extending in the same direction as the rotation axis of the high-speed shaft, and the rotation axes of the three rollers are spaced in a circumferential direction of the high-speed shaft, and
wherein the three rollers are disposed so that at least part of contact areas between the high-speed shaft and the rollers is free from overlapping with each other along the rotation axis of the high-speed shaft.