Heat treatment method for tubular shaft for drive shaft having ball spline structure and tubular shaft manufactured thereby
US12305251B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Dec 31, 2020 |
| Grant date | May 20, 2025 |
| Priority date | — |
| Expiry date | Mar 3, 2042 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/25
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
in a heat treatment method for a tubular shaft for a drive shaft having a ball spline structure for a plunging and an undercut region with a reduced diameter, a carburizing-austempering is performed such that a deep portion hardness of the undercut region is a value between HRC 35 to HRC 50.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.