CPC B22F 5/08 (2013.01) [B22F 1/00 (2013.01); B22F 3/162 (2013.01); F16H 55/06 (2013.01); F16H 55/17 (2013.01); B22F 2301/35 (2013.01)] | 11 Claims |
1. A sintered gear of annular shape, the sintered gear having a composition including a metal, wherein
the sintered gear has a plurality of pores in a surface thereof,
the sintered gear has a relative density of 93% or more and 99.5% or less,
the sintered gear has a periodic concave and convex shape for containing a lubricant at a tooth bottom thereof, and
a periodicity of the concave and convex shape has a length of 1 mm or more.
|