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US 2025/0122601 A1Published application
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
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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.
Claims14
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.
2 more elements
A method of manufacturing a cam ring and plate module for vehicle vacuum pumps, comprising:
- forming a molded body having the shape of a cam ring or a plate from an iron-based base material comprising molybdenum using a press die;
- and
- forming an oxide layer on a surface of the molded body by performing steam treatment on the molded body.
Dependencies are inferred from the claim text.