Injection valve for injecting fuel, into mixture processing apparatus in fuel injection or exhaust system of internal-combustion engine, has blowhole formed in ceramic body using laser which transmits pulses with extremely small pulse time

摘要

The valve has a blowhole (18) formed in a ceramic body i.e. injection-perforated disk (17), using a laser i.e. ultrashort pulse laser, which transmits pulses with extremely less pulse time. A surface of a perforated wall enclosing the blowhole has a homogenous fine structure depending on wavelengths and polarization of laser in micro and submicrometer range. The fine structure overlays a macrostructure lying in the micrometer range. The blowhole has an edge enclosing inlet and an outlet that are sharp-edged and burr-free. The disk is manufactured by injection molding method. An independent claim is also included for a method for forming a blowhole in a ceramic body i.e. valve seat body, or an injection-perforated disk of an injection valve.