Method for producing a ferromagnetic component for a torque sensor of a vehicle steering shaft, and torque sensor
US-2016379754-A1 · Dec 29, 2016 · US
Cam ring and plate module for vehicle vacuum pumps, and method of manufacturing the same
US12312664B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12312664-B2 |
| Application number | US-202418422722-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 25, 2024 |
| Priority date | Oct 16, 2023 |
| Publication date | May 27, 2025 |
| Grant date | May 27, 2025 |
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- Title
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Abstract
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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.
First claim
Opening claim text (preview).
The invention claimed is: 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 (Fe 3 O 4 ) formed on surfaces thereof. 2. The cam ring and plate module of claim 1 , wherein the iron-based base material comprises, based on 100 wt % of a total composition of the iron-based base material: 0.6 to 0.8 wt % of carbon (C); 0.7 to 1.0 wt % of chrome (Cr); 0.1 to 0.2 wt % of molybdenum (Mo); and a balance of iron (Fe) and other inevitable impurities. 3. The cam ring and plate module of claim 1 , wherein average surface roughness Ra of the oxide layer is equal to or more than 0.12 μm. 4. The cam ring and plate module of claim 1 , wherein the cam ring, the upper plate, and the lower plate each further comprise: a carbon layer stacked on the oxide layer. 5. The cam ring and plate module of claim 4 , wherein average surface roughness Ra of the carbon layer is less than 0.05 μm.
Assignees
Inventors
Classifications
Cast iron · CPC title
Iron · CPC title
Molybdenum · CPC title
Dry running · CPC title
with vanes reciprocating with respect to the inner member · CPC title
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Frequently asked questions
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- What does patent US12312664B2 cover?
- 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.
- Who is the assignee on this patent?
- Hyundai Motor Co Ltd, Kia Corp, Youngshin Prec Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C23C8/18. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue May 27 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).