Magnetic gear device having a plurality of magnetic bodies arranged in a particular configuration

Patent metadata

Field	Value
Publication number	US-9729040-B2
Application number	US-201214232183-A
Country	US
Kind code	B2
Filing date	Jun 27, 2012
Priority date	Jul 15, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The magnetic gear device is equipped with a first magnet row in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in a specific direction; a second magnet row which is opposed to the first magnet row and in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in the specific direction at a pitch shorter (or longer) than that of the first magnet row; and a magnetic body row which is disposed between the first magnet row and the second magnet row and in which a plurality of magnetic bodies are arranged at substantially equal intervals in the specific direction, wherein a distance between the plurality of magnetic bodies and the second magnet row in the opposing direction is shorter (or longer) than a distance between the plurality of magnetic bodies and the first magnet row.

First claim

The invention claimed is:

1. A magnetic gear device, comprising:
a first magnet row in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in a specific direction;
a second magnet row which is opposed radially outward to the first magnet row and in which a plurality of magnetic pole pairs are arranged at substantially equal intervals in the specific direction at a pitch shorter than that of the first magnet row; and
a magnetic body row which is disposed between the first magnet row and the second magnet row and in which a plurality of magnetic bodies are arranged at substantially equal intervals in the specific direction,
wherein a distance between the plurality of magnetic bodies and the second magnet row is shorter than a distance between the plurality of magnetic bodies and the first magnet row, wherein
the magnetic body row holds the plurality of magnetic bodies and is equipped with a partition for separating the first magnet row from the second magnet row, and
the plurality of magnetic bodies are held in the partition so as to be exposed to a side of the second magnet row.

2. The magnetic gear device according to claim 1 , wherein the magnetic body row is equipped with connection sections, each of which is used to connect adjacent ones of the plurality of magnetic bodies with each other, and the plurality of magnetic bodies and the connection sections are integrally formed.

3. The magnetic gear device according to claim 2 , wherein the distance between the connection section and the first magnet row is shorter than the distance between the connection section and the second magnet row.

4. The magnetic gear device according to claim 1 , wherein each of the plurality of magnetic bodies includes a laminated steel plate.

5. The magnetic gear device according to claim 1 , wherein one of the first magnet row and the second magnet row includes a sintered magnet and the other includes a bonded magnet.

6. The magnetic gear device according to claim 1 , wherein each of the first magnet row, the second magnet row and the magnetic body row has a cylindrical shape, and the specific direction is a circumferential direction of the first magnet row, the second magnet row and the magnetic body row.

7. The magnetic gear device according to claim 1 , wherein each of the first magnet row, the second magnet row and the magnetic body row has a disc shape, and the specific direction is the circumferential direction of the first magnet row, the second magnet row and the magnetic body row.

8. The magnetic gear device according to claim 1 , wherein the first magnet row, the second magnet row and the magnetic body row have a long plate shape, and the specific direction is a longitudinal direction of the first magnet row, the second magnet row and the magnetic body row.

9. The magnetic gear device according to claim 1 , wherein each of the first magnet row, the second magnet row and the magnetic body row has a cylindrical shape, and the specific direction is a direction of a central axis of the first magnet row, the second magnet row and the magnetic body row.

10. The magnetic gear device according to claim 3 , further comprising holding members provided between the magnetic bodies.

Assignees

• Sutani Junichi
• Ohhashi Hiromitsu
• Mita Masahiro
• Hitachi Metals Ltd

Inventors

• Sutani Junichi
• Ohhashi Hiromitsu
• Mita Masahiro

Classifications

• H02K49/10

  of the permanent-magnet type · CPC title

• H02K49/102 Primary

  Magnetic gearings, i.e. assembly of gears, linear or rotary, by which motion is magnetically transferred without physical contact (magnetized gearings with physical contact F16H13/12, F16H49/005) · CPC title

• F16H49/00 Primary

  Other gearings · CPC title