Electromagnetic clutch and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9777780-B2
Application number	US-201314655302-A
Country	US
Kind code	B2
Filing date	Dec 10, 2013
Priority date	Dec 26, 2012
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A ring insertion groove is formed between adjacent two of circular plates, which are made of a magnetic material and are arranged concentric with each other, and a ring, which is made of a non-magnetic material and has a larger deformation resistance in comparison to the magnetic material of the plates, is press fitted into the ring insertion groove. Thereafter, a peripheral part around an opening of the ring insertion groove is plastically flowed, so that a compression stress is left in the ring.

First claim

What is claimed is:

1. An electromagnetic clutch comprising:
a driving-side rotatable body that is rotated by a rotational drive force outputted from a drive source; and
a driven-side rotatable body that is rotated by the rotational drive force transmitted from the driving-side rotatable body when the driven-side rotatable body is attracted to and is coupled with the driving-side rotatable body with an electromagnetic force, wherein:
at least one of the driven-side rotatable body and the driving-side rotatable body includes:
a plurality of plates, which are respectively configured into a circular plate form and are made of a magnetic material, wherein the plurality of plates is concentric with each other; and
a ring, which is made of a non-magnetic material having a deformation resistance that is larger than a deformation resistance of the magnetic material of the plurality of plates, wherein the ring is placed between adjacent two of the plurality of plates;

the adjacent two of the plurality of plates and the ring are joined together while the magnetic material of each of the adjacent two of the plurality of plates is plastically deformed to leave a compression stress in the ring; and
the adjacent two of the plurality of plates clamp a radially outer portion and a radially inner portion of the ring, which are opposed to each other in a radial direction of a rotational axis of the driving-side rotatable body and of the driven-side rotatable body, from two opposite radial sides of the ring in the radial direction and also from two opposite axial sides of the ring in an axial direction of the rotational axis, so that the ring joins between the adjacent two of the plurality of plates in a state where the compression stress is left in the ring.

2. The electromagnetic clutch according to claim 1 , wherein the ring is cut at one circumferential location of the ring.

3. The electromagnetic clutch according to claim 1 , wherein a cross section of the ring, which is perpendicular to a circumferential direction, is configured into a shape of an ellipse or polygon.

4. The electromagnetic clutch according to claim 1 , wherein a cross section of the ring, which is perpendicular to a circumferential direction, is configured into a shape of a circle.

5. The electromagnetic clutch according to claim 1 , wherein the ring is divided into a plurality of pieces along a circumferential direction.

6. The electromagnetic clutch according to claim 1 , wherein a contact part between the adjacent two of the plurality of plates and the ring is coated by electropainting.

Assignees

• Denso Corp

Inventors

• Yamagami Yousuke
• Ueda Motohiko
• Ookuma Tooru
• Tabuchi Yasuo
• Mizuguchi Tomoyuki
• Mizutori Kazunori
• Tamatsu Yasuhiro

Classifications

• F16D27/112 Primary

  with flat friction surfaces, e.g. discs · CPC title

• F16D27/004 Primary

  with permanent magnets combined with electromagnets · CPC title

• F16D2027/008

  Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path · CPC title

• B23P2700/50

  Other automobile vehicle parts, i.e. manufactured in assembly lines · CPC title

• B23P11/00

  Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  (connecting sheet metal or metal tubes, rods or profiles B21D39/00; riveting B21J; soldering, unsoldering, welding B23K; hand tools for connecting wire or strip B25B25/00; connecting metal parts by adhesives F16B11/00) · CPC title