Method for manufacturing a leaf spring
US7284308B2 · kind B2 · utility
7Cited by
9References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2002 |
| Grant date | Oct 23, 2007 |
| Priority date | — |
| Expiry date | May 3, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49863
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Leaf springs have improved durability in spite of using inexpensive spring steel such as SUP9 and SUP11 as materials. While a spring main body, made of the spring steel in which Brinell hardness is under 555 HBW and not less than 388 HBW (corresponding to a diameter of under 2.70 mm of hardness and not less than 3.10mm of hardness on a Brinell ball mark), is maintained at 150 to 400° C., the load is applied in the direction in which the spring main body is to be used, and the first shotpeening is performed at the plane where the tensile stress acts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.