Magnetic type rotation transmitting mechanism

Patent metadata

Field	Value
Publication number	US-10753450-B2
Application number	US-201616320520-A
Country	US
Kind code	B2
Filing date	Sep 30, 2016
Priority date	Sep 30, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A magnetic type rotation transmitting mechanism has a rotating plate made of a magnetic material, and a magnet to which the rotational movement of the rotating plate is transmitted through a magnetic coupling between the magnet and the rotating plate. When the rotating plate is rotated, a plurality of oblique edge portions formed on the outer peripheral edge of the rotating plate rotate while sequentially passing through a magnet-facing area. The oblique edge portions move in the direction of the rotation centerline of the rotating plate, the rotation centerline being perpendicular to the center axis line of the magnet. The magnet is rotated about the center axis line by a magnetic force occurring between the magnet and the oblique edge portions passing through the magnet-facing area. It is possible to realize a small and compact mechanism for extracting rotation.

First claim

The invention claimed is:

1. A magnetic type rotation transmitting mechanism comprising:
a disc-shaped or toroidal-shaped rotating plate made of a magnetic material; and
a magnet to which rotational movement of the rotating plate is transmitted through a magnetic coupling between the magnet and the rotating plate,
wherein
the rotating plate has an outer peripheral edge part, the outer peripheral edge part being provided with an oblique edge portion separated at one place in a circumferential direction, or a plurality of oblique edge portions separated at equiangular intervals in the circumferential direction;
the magnet is located at a position in an area including a passage route along which the oblique edge portion moves in accordance with rotation of the rotating plate, the position being at which the magnet faces the oblique edge portion with a prescribed gap;
the oblique edge portion is inclined from a first end to the other second end thereof in the circumferential direction with respect to a direction of a rotation centerline of the rotating plate;
where an orthogonal plane is a plane which is orthogonal to the rotation centerline and which passes through a center between the first and second ends of the oblique edge portion when viewed along a direction of the rotation centerline,
the magnet is disposed to rotate about a center axis line located on the orthogonal plane; and
the magnet is either formed with a plurality of magnetic poles along a circumferential direction about the center axis line thereof or formed with a plurality of magnetic poles along the direction of the center axis line thereof.

2. The magnetic type rotation transmitting mechanism according to claim 1 ,
wherein the oblique edge portion is inclined in a linear or curved fashion from the first end to the second end when viewed from a direction along the orthogonal plane.

3. The magnetic type rotation transmitting mechanism according to claim 2 ,
wherein an outer peripheral surface of the oblique edge portion has a shape from the first end to the second end, the shape being defined by a circular arc centered on the rotation centerline.

4. The magnetic type rotation transmitting mechanism according to claim 2 ,
wherein the magnet is a plate magnet formed with a pair of magnets in the direction of the center axis line; and
the oblique edge portion has a shape of an outer peripheral surface thereof, the shape being defined by a true circle centered on a position eccentric by a predetermined amount with respect to the rotation centerline.

5. The magnetic type rotation transmitting mechanism according to claim 1 ,
wherein the magnet is a cylindrical magnet formed with a plurality of magnetic poles in the circumferential direction about the center axis line; and
the oblique edge portion has an inclined shape inclined in a direction of the rotation centerline and an outer-peripheral-surface shape,
the inclined shape and the outer-peripheral-surface shape being determined so that a position of the oblique edge portion passing through an area in which the oblique edge portion faces the cylindrical magnet passes in a curved fashion along an outer peripheral surface of the cylindrical magnet toward a direction of the rotation centerline.

6. The magnetic type rotation transmitting mechanism according to claim 5 ,
wherein the oblique edge portion is inclined in a curved fashion from the first end to the second end when viewed from a direction along the orthogonal plane; and
the outer-peripheral-surface shape of the oblique edge portion is defined by a curve having a radius centered on the rotation centerline,
the radius being decreased from the first end to a midpoint located on the orthogonal plane and being increased from the midpoint to the second end.

7. The magnetic type rotation transmitting mechanism according to claim 6 ,
wherein the cylindrical magnet has an outer diameter dimension so that it can be disposed between the first end and the second end of the oblique edge portion; and
at least a part of the cylindrical magnet is disposed within a maximum outer diameter dimension of the rotating plate.

Assignees

• Harmonic Drive Systems

Inventors

• Kanayama Naoki
• Takeda Toru

Classifications

• H02K49/00

  Dynamo-electric clutches; Dynamo-electric brakes · CPC title

• F16H49/00

  Other gearings · CPC title

• H02K49/104

  Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element · CPC title

• F16H49/005 Primary

  Magnetic gearings with physical contact between gears · CPC title

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title