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:
Feb. 27, 1979
Filed:
Dec. 08, 1977
Cormac G O'Neill, Laffayette, CA (US);
Physics International Company, San Leandro, CA (US);
Abstract
A fuel pump for providing fuel at relatively high pressure is activated by gas pressure, created during the compression stroke of an internal combustion engine. The pump includes a piston and a hollow plunger which are biased by a single spring in opposite directions. The piston, which is exposed to gases in the engine's cylinder, is urged, by the gas pressure in the cylinder during the compression stroke, to move upwardly. A limit is placed on the piston's upward stroke. When reaching the upward limit the pressure which is applied to fuel in a fuel chamber is only a function of the force applied by the spring to the plunger. When fuel ejection is enabled, the spring pushes the plunger toward the fuel chamber to eject the fuel therefrom. Toward the end of the exhaust stroke the piston moves toward the engine cylinder, forcing the plunger to move in the same direction until the latter's travel is limited by limiting means. Fuel is then injectable into the fuel chamber for subsequent ejection.