Damper spring
US12338516B2 · kind B2 · utility
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2References
4Claims
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Key dates
| Filing date | Feb 19, 2021 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Mar 18, 2042 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F1/021
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A damper spring which has an excellent fatigue limit is provided. A chemical composition of the damper spring according to the present embodiment contains in mass %, C: 0.50 to 0.80%, Si: 1.20 to less than 2.50%, Mn: 0.25 to 1.00%, P: 0.020% or less, S: 0.020% or less, Cr: 0.40 to 1.90%, V: 0.05 to 0.60%, and N: 0.0100% or less, with the balance being Fe and impurities. In the damper spring, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 5000 to 80000 pieces/μm3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.