INJECTOR

PROBLEM TO BE SOLVED: To reduce wear of a sliding part by absorbing axial deviation and deflection deformation between two members in a back pressure control valve consisting of the two members of a long column-like control piston 15 and a needle 43. SOLUTION: A fuel injection valve 1 includes a nozzle body 40 for slidably supporting the needle 43 for opening an injection hole 49, a valve body 20 having an end surface exposed to a pressure control chamber 61 separated by a sleeve 14 where a fuel pressure is controlled and having a control piston 15 penetrating through a fuel chamber 42 filled with a high-pressure fuel and an opening and closing valve mechanism 5 for releasing the fuel pressure of a pressure control chamber 61. An end side of the control piston 15 and another end side of the needle 43 are integrally held in an axial core direction by a connection mechanism via a shim 77 for allowing axial deviation in a direction perpendicular to the axial core direction and deflection deformation along the axial core direction 7. COPYRIGHT: (C)2011,JPO&INPIT