US 11,852,139 B2
Outer ring for an oil pump and a method for manufacturing the same
Hak Soo Kim, Seoul (KR); Dong Sub Song, Ansan-si (KR); and Jung Beom Koo, Ansan-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and MYUNG HWA IND. CO., LTD., Ansan-si (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and MYUNG HWA IND. CO., LTD., Ansan-si (KR)
Filed on Aug. 10, 2022, as Appl. No. 17/884,646.
Claims priority of application No. 10-2021-0107521 (KR), filed on Aug. 13, 2021.
Prior Publication US 2023/0052262 A1, Feb. 16, 2023
Int. Cl. F04C 2/08 (2006.01); B22F 3/16 (2006.01); B22F 1/00 (2022.01)
CPC F04C 2/082 (2013.01) [B22F 1/09 (2022.01); B22F 3/16 (2013.01); B22F 2201/013 (2013.01); B22F 2201/02 (2013.01); B22F 2301/10 (2013.01); B22F 2301/35 (2013.01); F04C 2230/22 (2013.01); F04C 2240/20 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for manufacturing an outer ring for an oil pump, the method comprising:
mixing a pre-alloy powder with a copper mixture to prepare a mixed powder;
compacting the mixed powder into a compact;
sintering the compact to prepare a sintered body; and
sinter hardening the sintered body,
wherein the pre-alloy powder comprises:
1.35 wt. % to 1.65 wt. % of chromium;
0.16 wt. % to 0.24 wt. % of molybdenum;
0.10 wt. % to 0.25 wt. % of manganese; and
a balance of iron, and
wherein the copper mixture comprises:
15 wt. % to 18 wt. % of carbon;
8 wt. % to 9 wt. % of manganese sulfide;
55 wt. % to 57 wt. % of copper; and
19 wt. % to 20 wt. % of a lubricant.