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Electromagnetic clutch with asymmetric spoke patterns

  • US 6,302,251 B1
  • Filed: 03/02/2000
  • Issued: 10/16/2001
  • Est. Priority Date: 03/02/2000
  • Status: Expired due to Term
First Claim
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1. An electromagnetic clutch comprising, in combination,a friction disc pack having first and second interleaved pluralities of clutch discs and an electromagnetic operator including an electromagnetic coil, a rotor, an armature and a ball ramp assembly for providing a compressive force to said disc pack when said electromagnetic coil is energized, one of said rotor and said armature defining a first plurality of slots arranged in a first circular path and a second plurality of slots arranged in a second circular path circumferentially offset from said first plurality of slots, another of said rotor and said armature having a third plurality of slots distinct in number from said first plurality of slots and arranged in a third circular path, wherein a number of arcuate slots in said first and said second pluralities of slots and a number of arcuate slots in said third plurality slots is governed by an expression NR±

  • IO=NA where NR is the number of arcuate slots in each of said first and said second pluralities of slots, IO is an odd integer and NA is the number of slots in said third plurality of slots.

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