Fuel valve for air-vapor mixer
US4699630A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1983 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Jan 14, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved fuel valve for an air-vapor mixer device for the fuel supply system of an internal combustion engine with which it is in thermal contact is disclosed. The valve operates in a fuel metering orifice and is composed of an acetal copolymer resin having a high coefficient of expansion. When the valve is cool, the metering orifice provides a richer mixture of fuel to air for cold starting and idling. As the engine warms up, the fuel valve expands through thermal contact with the engine and as a result of its high coefficient of expansion decreases the effective size of the orifice to lean the mixture and thereby provide better fuel economy and reduced pollutants. For mid-range control the fuel valve has a section of generally frustoconical configuration provided with circumferential steps that lean out mid-range mixtures for average operating conditions and produce an optimal admixture of fuel and air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.