Lubrication pressue control of a power transmission device for helicopter
US11618556B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2019 |
| Grant date | Apr 4, 2023 |
| Priority date | — |
| Expiry date | May 27, 2040 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16N2280/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A transmission device includes a casing accommodating a transmission gear and having an oil sump for retaining oil. The oil in the oil sump flows from a lubrication pump through a lubrication passage and is injected to the transmission gear. A connection portion is provided in a part of the lubrication passage, which part is disposed outside the casing. A direction control valve is provided downstream of the lubrication pump and upstream of the connection portion in the lubrication passage with respect to a flow direction of the oil. The direction control valve is configured to open the lubrication passage when a hydraulic pressure in the lubrication passage exceeds a predetermined value and to close the lubrication passage when the hydraulic pressure is equal to or lower than the predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.