Fuel injection nozzles

Claim 1

A fuel injection nozzle of the inwardly opening type comprising an elongated valve member movable in a bore and a nozzle body, said valve member being shaped at one end for cooperation with a seating, a first spring abutment mounted on said valve member at the other end thereof, a first coiled compression spring having one end engaging said first spring abutment to bias said valve member into engagement with said seating to prevent flow of fuel from an inlet to and outlet, said first coiled compression spring being housed within a holder to which said nozzle body is secured, said valve member being lifted from said seating by fuel under pressure supplied to an inlet, a second coiled compression spring housed within an insert which is adjustably mounted in a holder, a second spring abutment located in said insert adjacent a base wall thereof, and engaged by on end of said second spring, an aperture formed in said base wall, an abutment rod loosely located between said spring abutments to define a gap in the closed position of the valve member, the initial movement of said valve member being against the action of said first spring until said gap is closed, and further movement of said valve member being against the action of said first and said second springs, said abutment rod at one end being guided by the surfaces of said opening in the base wall of said insert, and at a distance from said one end by guide means located apart from said insert.