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US 12,312,664 B2Granted
Cam ring and plate module for vehicle vacuum pumps, and method of manufacturing the same
AssigneesHyundai Motor Company, Kia Corporation, Youngshin Precision Co., Ltd.
InventorsHak Soo Kim, Go Woon Jung, Jin Hyeon Lee, Seung Yong Shin, Seung Woo Lee, O Su Jang
Life of this patent
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Abstract
A cam ring and plate module for vehicle vacuum pumps in which, when an oxide layer formed through steam treatment comes into contact with a carbon or graphite material, a uniform carbon layer is stacked on the oxide layer so as to improve corrosion resistance, wear resistance, hardness and seal resistance.
Claims5
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.
4 more elements
Dependencies are inferred from the claim text.