Reusability determination method for gear and reusability determination system for gear
US12007299B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2020 |
| Grant date | Jun 11, 2024 |
| Priority date | — |
| Expiry date | Oct 28, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is a reusability determination method for a gear that makes it possible to determine reusability of a gear during or after use to increase the reuse ratio. The reusability determination method for a gear of the present invention includes a step of measuring a content of retained γ phases in the gear, a step of calculating a change rate of the content of the retained γ phases, a step of measuring residual stress applied to the gear, a residual stress ratio calculation step of calculating a residual stress ratio to residual stress in an initial state of the gear, and a reusability determination step of determining whether or not the gear is reusable on the basis of results of the calculation in the retained γ phase change rate calculation step and the residual stress ratio calculation step. In the reusability determination step, it is determined that the gear is reusable where the state of the gear corresponds to a first phase P1 or a second phase P2 from among the first phase P1, the second phase P2, and a third phase P3, and it is determined that the gear is not reusable where the state of the gear corresponds to the third phase P3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.