Needle lift damper device and a needle lift damping method a fuel injector

The present invention, in the fuel injector (8b), always aimed at obtaining a stable needle lift damping effect. And relief of the fuel pressure in the pressure control chamber (37) inside In the injector (8b) for lifting the needle valve (36), a needle valve (36) to slidably mounted damper member (62), the damper member (62) and damping chamber formed between the needle valve (36) and (63), and a leak passage for leaked squeezing fuel in the damping chamber (63) (64), increase of the damper member (62) position providing a stopper member (41) to limit. Damping chamber fuel within (63) squeezed by leak passage (64) by a leak, for damping the lift of the needle valve (36). Plays a needle valve (36) guide function of the damper member (62), is prevented with swinging of damper elements (62), always stable needle lift damping effect is obtained.