The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1989
Filed:
Jun. 23, 1988
Robin J Bremmer, Columbus, IN (US);
Roscoe A Baker, Columbus, IN (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
A tamper-proof dual spring controlled air fuel control for a compression ignition type internal combustion engine is provided wherein fuel is supplied to the engine cylinders in response to the pressure of the air in the intake manifold. A pair of oppositely biased springs controls the movement of a stem valve in response to intake manifold air pressure exerted on a flexible diaphragm located between the oppositely biased springs. The stem valve includes a plunger within a barrel in the air fuel control housing in the engine fuel pump. The cross-sectional profiles of the plunger and barrel are designed to meter precisely a controlled amount of fuel to the engine fuel supply system as the intake air pressure increases and to reduce this metered flow as the intake air pressure decreases. Two plunger and barrel assembly embodiments having different profiles are provided. A class fit between the barrel and plunger of the present air fuel control wherein the clearance must not exceed 0.000075 to 0.000125 inches and pressure regulating means located in the plunger substantially eliminate fuel leakage from the barrel. Internal venting means are provided to direct any minimal amount of fuel which might leak to the engine crankcase.