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Component parts of a toroidal-type continuously variable transmission having improved life

  • US 5,855,531 A
  • Filed: 11/08/1996
  • Issued: 01/05/1999
  • Est. Priority Date: 01/18/1994
  • Status: Expired due to Term
First Claim
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1. A toroidal-type continuously variable transmission comprising:

  • an input side disk disposed on an input shaft;

    an output side disk disposed on an output shaft; and

    a pair of power roller bearings disposed between the input and output side disks, each of the bearings including an inner race, an outer race, and a plurality of rolling elements interposed between the inner and outer races and transmitting motive power of the input shaft to the output shaft while engaging the inner race with the input and output side disks, wherein each of the rolling elements has a residual compressive stress ranging from 19 to 74 kgf/mm2 in its rolling surface, and wherein each of the rolling elements has carbon and nitrogen dissolved in a surface layer of its rolling surface by means of a carbonitriding treatment.

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