In the poppet valve gear for high tension fluid path opening and closing where it can provide

摘要

PROBLEM TO BE SOLVED: To provide a poppet valve device including a poppet valve installed, in particular on an electronically controlled fuel injection device, for opening and closing a liquid passage in a minute time, capable of precluding such occurrences even when the liquid pressure becomes very high, as cracking in a high pressure passage in the valve, cavitational erosion of valve members, an increase in working (sliding) resistance of a valve element, and bouncing of the valve element.;SOLUTION: The poppet valve device is structured so that axially directed passages leading to a high pressure chamber are formed in a plurality of adjoining passage holes and arranged in positions symmetrical about the axial center line of the poppet valve in such an arrangement as having the same diameter and approximately the same pipeline length, and is arranged so that the width of an annular gap formed by the periphery of the intermediate drum part of a poppet valve member and the inside surface of an annular projection furnished with a valve seat of a valve seat member is narrowed. The tip of the poppet valve member and the poppet valve mounting bottom surface are formed so that a fuel inlet to the axial hole of the poppet valve member for releasing the fuel when the poppet valve member sinks at the time of valve opening and abuts to the poppet valve device mounting bottom surface is narrowed, and thereby mounting on the electronically controlled fuel injection device is performed.;COPYRIGHT: (C)2005,JPO&NCIPI