US 12,312,664 B2
Cam ring and plate module for vehicle vacuum pumps, and method of manufacturing the same
Hak Soo Kim, Seoul (KR); Go Woon Jung, Hwaseong-si (KR); Jin Hyeon Lee, Seongnam-si (KR); Seung Yong Shin, Gyeongju-si (KR); Seung Woo Lee, Gumi-si (KR); and O Su Jang, Pohang-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and YOUNGSHIN PRECISION CO., LTD., Gyeongju-si (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); KIA CORPORATION, Seoul (KR); and YOUNGSHIN PRECISION CO., LTD., Gyeongju-si (KR)
Filed on Jan. 25, 2024, as Appl. No. 18/422,722.
Claims priority of application No. 10-2023-0137411 (KR), filed on Oct. 16, 2023.
Prior Publication US 2025/0122601 A1, Apr. 17, 2025
Int. Cl. C22C 38/22 (2006.01); C23C 8/18 (2006.01); F04C 18/344 (2006.01)
CPC C22C 38/22 (2013.01) [C23C 8/18 (2013.01); F04C 18/344 (2013.01); F04C 2220/12 (2013.01); F05C 2201/0409 (2013.01); F05C 2201/0436 (2013.01); F05C 2201/0439 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A cam ring and plate module for vehicle vacuum pumps, comprising:
a cam ring comprising an accommodation space configured to receive a rotor and a plurality of vanes, and a diaphragm configured to surround the accommodation space;
an upper plate positioned at one side of the cam ring and configured to seal the accommodation space; and
a lower plate positioned at an opposite side of the cam ring and configured to seal the accommodation space;
wherein the cam ring, the upper plate, and the lower plate each comprise an iron-based base material comprising molybdenum; and
wherein the cam ring, the upper plate, and the lower plate each comprise an oxide layer comprising magnetite (Fe3O4) formed on surfaces thereof.