HYDRAULIC DISTRIBUTING VALVE Russian patent published in 2003 - IPC

FIELD: mechanical engineering; internal combustion engines. SUBSTANCE: invention relates to fuel injection devices of internal combustion engines. Proposed hydraulic distributing valve contains valve element with piston to control valve travel. Said piston is loaded by compression spring in direction of closing said valve element to hold the latter in contact with valve seat. Control piston, as movable wall, limits hydraulic connecting space which is limited from other side by drive piston of piezoelectric drive. In process of working stroke of piston, pressure in connecting space rises with resulting displacement of control piston to overcome resistance of compression spring in direction of valve opening. Device to increase pressing force is found in connecting space arranged between drive piston and piston to control valve element at least at one side of said space. Said device is installed on drive piston and/or on control piston. EFFECT: reduced leaks, simplified design, improved economy. 8 cl, 8 dwg