Fuel metering check valve arrangement for a time-pressure controlled unit fuel injector

US6116273A · kind A · utility

Assignee

• CUMMINS ENGINE COMPANY · US

Inventors

• Yul J. Tarr · Columbus, US
• Lester L. Peters · Columbus, US
• Bai Mao Yen · Columbus, US
• Laszlo D. Tikk · Columbus, US
• Ivar L. Johnson · Columbus, US
• Daniel G. Burns · Isle of Palms, US
• Mustahsen Gull · Columbus, US
• Harry L. Wilson · Columbus, US
• George L. Muntean · Columbus, US

Key dates

• Filing date: Dec 8, 1997
• Grant date: Sep 12, 2000
• Expiry date: Dec 8, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7927
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Check valves (500) are incorporated into a fuel injector so as to form a controlling orifice in the system between the solenoid vales which direct fuel to the respective injection and timing chambers of the fuel injector and the chambers themselves. The precision fuel metering capability of the valve (500) is determined by an annular clearance created between the plunger (512) of the valve and the valve body (510) when the valve is in its maximum stroke. For achieving a bi-stable operation of the valve, the ratio of the plunger valve seat (510d) area to the maximum plunger valve (512b) area and the spring (514) are key parameters. The check valves (500) are formed as cartridge type check valves that can be calibrated outside of the injector prior to the installation thereof.