A spray hole profile

摘要

A fuel injector for an internal combustion engine comprising a nozzle body (3) having at least one spray hole (1). The at least one spray hole (1) has a hole entry (9) on the inside of the nozzle body and a hole exit (11) on the outside of the nozzle body (3). The spray hole (1) is provided with a hole entry section (15) which, starting from the hole entry (9), has a flow area which decreases from a relatively larger flow area at the hole entry (9) to a relatively small flow area at the intersection between the end of the hole entry section (15) and the start of a hole exit section (17). The hole exit section (17), starting from the intersection with the hole entry section (15), has a flow area which increases from a relatively small flow area at the intersection with the hole entry section (15) to a relatively larger flow area at the hole exit (11).