ELECTROMAGNETIC CLUTCH

• US 3,703,227 A
• Filed: 01/27/1971
• Issued: 11/21/1972
• Est. Priority Date: 01/30/1970
• Status: Expired due to Term

• Current Assignee: Ken Kikuchi, Riyouzou Tomozaki, Tadao Murakami, Yasushi Ohuchi
• Original Assignee: Ken Kikuchi, Riyouzou Tomozaki, Tadao Murakami, Yasushi Ohuchi
• Inventors: Murakami, Tadao, Kikuchi, Ken, Tomozaki, Riyouzou, Ohuchi, Yasushi
• Primary Examiner(s): Herrmann, Allan D.
• Application Number:
  US05/110,032
• Time in Patent Office: 664 Days
• Field of Search: 192/84C,11R
• US Class Current: 192/84.5
• CPC Class Codes: F16D 2027/008 Details relating to the magnetic circuit, or to the shape of the clutch parts to achieve a certain magnetic path
• CPC Class Codes: F16D 27/112 with flat friction surfaces, e.g. discs

Abstract

An electromagnetic clutch comprising a rotor having a beltreceiving groove for receiving the driving force from a prime mover, a magnetic circuit and a conductive plate; a stator having electromagnetic means disposed therein; and a clutch disc mounted on a rotary shaft of a rotary machine or the like; wherein said rotor is connected to the stator through a ball bearing, and said rotor and said stator in the assembled state have a through-hole formed therein for receiving the rotary shaft and further the armature plate of said clutch disc and said conductive plate are axially arranged with a slight gap therebetween, said rotor and said stator respectively being made up of a plurality of constituent elements including pressed elements and short pipes which are united together at their contacting surfaces by friction welding.

Claims

1. An electromagnetic clutch comprising a pulley having a cylindrical member made of a magnetic material and provided with a first rim at one end thereof, and a second rim adapted to be fitted over said cylindrical member to define a belt receiving groove in cooperation with said first rim;

a flange member made of a magnetic material and secured to at least one end of said cylindrical member to provide a clutch surface;

a sleeve extending from said flange member into said cylindrical member and being rotatable together with said pulley;

a stator including electromagnetic means disposed between the cylindrical member of said pulley and said sleeve, and forming part of a magnetic circuit for the magnetic vlux produced by said electromagnetic means per se, said electromagnetic means being excited from a predetermined power source;

a bearing engaging said stator and rotatably supporting said sleeve;

a shaft extending through said stator; and

a clutch disc provided on a hub secured to said shaft and having at least the surface thereof which is opposed by said clutch surface with a predetermined gap therebetween made of a magnetic material.

2. An electromagnetic clutch according to claim 1, wherein the cylindrical member of said pulley has a step formed at a portion thereof for blocking the second rim and the second rim is secured to said step by friction welding.

3. An electromagnetic clutch according to claim 1, wherein the cylindrical member of said pulley has a predetermined length and substantially encloses said stator thereby to minimize the magnetic circuit resistance.

4. An electromagnetic clutch according to claim 1, wherein said stator has a substantially U-shaped cross section and includes an outer member having a hole of predetermined diameter formed in the central portion of the bottom thereof, a first ring disposed in the inside of said outer member and secured to the bottom thereof, and a second ring secured to said outer member in the vicinity of said hole and having an outer diameter smaller than the inner diameter of said first ring, and said electromagnetic means is inserted in the space defined by the inner wall of said outer member and the outer wall of said first ring.