Assembly of internal combustion engine valve and valve seat
US10287933B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 17, 2014 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Dec 17, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L3/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In an assembly of a hollow poppet valve and a valve seat insert, the hollow poppet valve's head is integrally formed with a stem end, a hollow part is formed from the head to a stem, and coolant is filled into the hollow part along with an inert gas. The valve seat insert is formed of iron base sintered alloy and obtained by integrating two layers of a supporting material side layer and a valve contact face side layer. The hollow poppet valve is formed of a material having thermal conductivity of 5-45 (W/m·K) at 20-1000° C. The valve seat insert includes the supporting material side layer having thermal conductivity of 23-50 (W/m·K) at 20-300° C. and a valve contact face side layer having thermal conductivity of 10-22 (W/m·K) at 20-300° C. This enables a valve temperature decrease throughout an engine's entire RPM range compared with the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.