Internal combustion engines
US4995358A · kind A · utility
3Cited by
2References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1990 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Apr 11, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A dual duct porting system comprises a pair of juxtaposed bent, side entry supply ducts (14, 15) merging into a single supply passage (16) encircling a valve stem (13). Each supply duct (14, 15) has eddy creating means (20) provided at a radially inner region of the duct bend and an outwardly bulging portion (21) at a radially outer region of the duct bend to provide a flow in the merged passage (16) which is more evenly spread around the valve head to be shed therefrom as evenly distributed toroidal vortices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.