Patent ID: 7467750
Filing Date: 2008-12-23
Classification: F02M

Abstract:
1. Needle-spring locking device for pump-injectors (injectors) of fuel supply systems for internal combustion engines, specifically for diesels, which is mounted in the body of pump-injector (injector), wherein a bushing with pumping plunger is installed, driven by a cam or by hydraulically driven piston, said plunger's bushing having an upper cylindrical part, in which the plunger is moving, and a lower, larger-diameter part with a precision surface adjoining the precision surface of the body of nozzle, consisting also the nozzle needle and it's spring, a pump-injector body and nozzle body being pressed together by a tightening nut along said surfaces, said device distinguished by the fact that a cylindrical helical spring is mounted around the outer surface of the upper part of the plunger's bushing and a cylindrical aperture being formed in the lower, larger-diameter part of the bushing above the precision face, said aperture being perpendicular to the bushing axle, and a radial opening also formed in the bushing adjoining the center of said aperture; a cross-arm being mounted in said cylindrical aperture, and the face of the nozzle needle coming out to said radial opening;, one face of the spring stopping against said body, and the other face stopping upon ends of said cross-arm, its central section stopped against the face of the nozzle needle.