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Shaft and manufacturing method thereof

  • US 20040063506A1
  • Filed: 09/30/2003
  • Published: 04/01/2004
  • Est. Priority Date: 09/30/2002
  • Status: Active Grant
First Claim
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1. A shaft having a shank with a splined portion that is spline engaged with a fitting member, and with an external diameter portion that is formed with a distance of separation from the splined portion, both the splined portion and the external diameter portion being formed in an outer peripheral surface of the shank, comprising:

  • any one of a curved portion, a plurality of curved portions, and a plurality of curved portions and at least one straight portion, that extend continuously so as to connect a cut back portion formed at an end portion of a groove portion of the splined portion and the external diameter portion.

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