US 11,745,261 B2
Sintered gear
Tomoyuki Ishimine, Osaka (JP); Shigeki Egashira, Osaka (JP); Kazunari Shimauchi, Osaka (JP); and Takayuki Tashiro, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and SUMITOMO ELECTRIC SINTERED ALLOY, LTD., Takahashi (JP)
Appl. No. 17/638,200
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP); and Sumitomo Electric Sintered Alloy, Ltd., Takahashi (JP)
PCT Filed Aug. 30, 2019, PCT No. PCT/JP2019/034297
§ 371(c)(1), (2) Date Feb. 25, 2022,
PCT Pub. No. WO2021/038879, PCT Pub. Date Mar. 4, 2021.
Prior Publication US 2022/0299097 A1, Sep. 22, 2022
Int. Cl. B22F 5/08 (2006.01); B22F 3/16 (2006.01); F16H 55/06 (2006.01); F16H 55/17 (2006.01); B22F 1/00 (2022.01)
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
OG exemplary drawing
 
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.