SELF-ADJUSTING CLUTCH OR BRAKE

• US 3,857,468 A
• Filed: 04/05/1973
• Issued: 12/31/1974
• Est. Priority Date: 04/05/1973
• Status: Expired due to Term

• Current Assignee: Mitsuo Sakurai, Yoshihisa Iritono
• Original Assignee: Mitsuo Sakurai, Yoshihisa Iritono
• Inventors: Iritono, Yoshihisa, Sakurai, Mitsuo
• Primary Examiner(s): Herrmann, Allan D.
• Application Number:
  US05/348,151
• Time in Patent Office: 635 Days
• Field of Search: 192/70.25,84C,111A 188/71.8,196P
• US Class Current: 192/84.51
• CPC Class Codes: F16D 27/112 with flat friction surfaces, e.g. discs

Abstract

In an electromagnetic device of the type wherein a driven member is attracted against a friction disc by means of an electromagnet, an annular spring seat is secured on the side of the driven member opposite the friction disc, and the radially inner end of the spring seat is bent to define an annular space between the spring seat, the driven shaft and the driven member, a slide ring having a friction member which is adapted to frictionally engage the driven shaft is disposed in the annular space and a restoring spring is interposed between the spring seat and the slide ring whereby when the driven member is brought into frictional engagement with the friction disc, the slide ring is moved toward the friction disc by the slide spring thus maintaining the gap between the friction disc and the driven member always at a definite value irrespective of the wear of the friction disc.

Claims

1. An electromagnetic device comprising a friction disc mounted on a drive shaft, a driven member mounted on a driven shaft to be slidable in the axial direction, said driven member confronting said friction disc with a definite gap therebetween in an inoperated condition, an electromagnet to attract said driven member into engagement with said friction member, characterized in that there are provided an annular spring seat secured to the side of said driven member opposite said friction disc, the radially inner end of said spring seat being beNt to define an annular space between said driven member, said driven shaft and said spring seat, a slide ring contained in said annular space, said slide ring being provided with a friction member adapted to frictionally engage said driven shaft, and a spring interposed between said spring seat and said slide ring, whereby when said driven member is brought into frictional engagement with said friction disc, said slide ring is moved toward said friction disc by said spring seat.

2. The electromagnetic device according to claim 1 wherein a plurality of axial splines are formed on the outer surface of said driven shaft and said driven member is provided with a gear on its inner periphery which meshes with said splines.

3. The electromagnetic device according to claim 2 wherein radially extending shoulders are formed on the outer ends of said splines to limit the outward movement of said spring seat.

4. The electromagnetic device according to claim 1 wherein said slide ring is cut in the radial direction in at least one position.

5. The electromagnetic device according to claim 1 wherein said slide ring is a continuous ring.

6. The electromagnetic device according to claim 1 wherein said friction member takes the form of a circular band which is secured to the inner surface of said slide ring.

7. The electromagnetic device according to claim 1 wherein said friction member takes the form of a ring having a circular cross-section and received in a groove on the inner surface of said slide ring.