Patent ID: 6886758
Filing Date: 2005-05-03
Classification: F02M

Abstract:
1. A direct injection fuel injector having a fuel inlet, a fuel outlet, and a fuel passageway extending from the fuel inlet to the fuel outlet along a longitudinal axis, the fuel injector comprising: a body having an inlet portion, an outlet portion, a neck portion disposed between the inlet portion and the outlet portion, the neck portion including a metallic cylindrical annulus that provides a body passage extending from the inlet portion to the outlet portion along the longitudinal axis of the fuel injector; an armature proximate the inlet portion of the body; a cylindrical needle operatively connected to the armature; a seat disposed at the outlet portion of the body, the seat having a passageway providing a fuel distribution outlet through the passageway, the seat including a circumferential portion disposed within the body and directly connected to the interior surface of the body so that the circumferential portion extending along the longitudinal axis within the body is contiguous to the interior surface; and a swirl generator proximate the seat, the swirl generator having a guide disk contiguous to a flat disk, each of the guide disk and flat disk having a first surface generally parallel to a second surface extending from an outer perimeter to a central aperture of respective disks, the flat disk having a central aperture and an equal number of apertures axially in-line with apertures angularly spaced in the guide disk and having a slot means extending from each of said angularly spaced apertures tangentially to said central aperture so that the seat with the swirl generator forms an assembly welded to the body as fuel flows through the apertures in the guide disk and is metered and directed in a tangential direction to the central aperture in the flat disk; wherein the cylindrical annulus of the body includes an inner diameter that is greater than a diameter of the cylindrical needle so as to define the body passage, which maintains an operative relationship between the body and the needle when the body is exposed to operating temperatures of a cylinder of an engine.