To accurately adjust an injection hole shielding area continuously by connecting a rotary valve and a rotary shaft together via a adjusting mechanism in a device in which the rotary valve is housed in a hole formed in a nozzle tip part and an injection hole is made variable.
A nozzle body 3 includes a hole 34 composed of a linear cylindrical wall 340 extended from the end of a conical sheet surface 303 following the same and a conical wall 341 followingly provided in a lower end. A rotary valve 7 rotary-driven is installed in this hole 34. This rotary valve 7 is connected to a joint pin 8b via an adjusting mechanism composed of an oldum coupling 10 firmly connected to the rotary valve 7 by forming a gap with this valve 7 during the closing of a needle valve 4 and eliminating this gap during the opening of the needle valve 4, and thus the shielding area of an injection hole 35 is adjusted continuously.
NOZAKI MASAYA
MIYAMOTO TAKESHI
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