Fuel injector nozzles

A fuel injector nozzle having a port through which at least fuel is delivered to an engine, said nozzle further comprising a flow control body arranged external to said port and having an external control surface arranged downstream from said port, said external control surface being configured and positioned to promote the fluid spray established by fluid issuing from the port to, at least in part, follow a path determined by the shape of said external control surface, whereby, in use, said nozzle includes a relatively cool region adjacent said port arising as a consequence of fuel located internally of said nozzle and a relatively hot region on said flow control body arising as a consequence of exposure to relatively high combustion chamber temperatures, said cool region and said hot region giving rise to a thermal gradient region therebetween, and wherein at least a portion of said flow control body includes a thermal insulating region, said insulating region being located intermediate at least a portion of said cool region and at least a portion of said hot region such that said thermal gradient region is controlled so as to be contained internal to an said external control surface of the flow control body.

An injector nozzle through which fluid is delivered, said nozzle comprising a port having an internal surface and a valve member having a complementary external surface, said valve member being movable relative to the port to respectively provide a passage between said surfaces for the delivery of fluid in the form of a spray or sealed contact therebetween to prevent the delivery of fluid, and said injector nozzle having a fluid flow control body located beyond an extremity of the port, said flow control body having a control surface arranged downstream from the port in the direction of fluid delivery, said control surface being configured and positioned to promote the fluid spray established by the fluid issuing from the port to, in part, follow a path determined by the shape of said control surface, wherein said flow control body includes an insulating region arranged so as to restrict the transfer of heat from the control surface to the nozzle and wherein the insulating region of the flow control body is arranged to have a generally “L-shaped” cross-section.

An injector nozzle through which fluid is delivered, said nozzle comprising a port having an internal surface and a valve member having a complementary external surface, said valve member being movable relative to the port to respectively provide a passage between said surfaces for the delivery of fluid in the form of a spray or sealed contact therebetween to prevent the delivery of fluid, and said injector nozzle having a fluid flow control body located beyond an extremity of the port, said flow control body having a control surface arranged downstream from the port in the direction of fluid delivery, said control surface being configured and positioned to promote the fluid spray established by the fluid issuing from the port to in part follow a path determined by the shape of said control surface, wherein said flow control body includes a sleeve member formed intermediate said flow control surface and an insulating region and wherein at least a portion of said insulating region extends between an end face of said valve member and a portion of said flow control surface closest to said end face of said valve member.

An injector nozzle through which fluid is delivered, said nozzle comprising a port having an internal surface and a valve member having a complementary external surface, said valve member being movable relative to the port to respectively provide a passage between said surfaces for the delivery of fluid in the form of a spray or sealed contact therebetween to prevent the delivery of fluid, and said injector nozzle having a fluid flow control body located beyond an extremity of the port, said flow control body having a control surface arranged downstream from the port in the direction of movement of the valve member, said control surface being configured and positioned to promote the fluid spray established by the fluid issuing from the port to, at least in part, follow a path determined by the shape of said control surface, wherein said flow control body includes an insulating region at least a portion of which is located between an end face of the valve member and a portion of the control surface closest to said end face of said valve member and said insulating region arranged so as to restrict the transfer of heat between the control surface and the valve member whereby, in operation, said portion of said control surface closest to said end face of the valve member is maintained substantially at temperatures above carbon deposit formation temperatures.