JPH0269063U

JPH0269063U -

Info

Publication number: JPH0269063U
Application number: JP14827988U
Authority: JP
Priority date: 1988-11-14
Filing date: 1988-11-14
Publication date: 1990-05-25

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例を示す縦断面図、
第２図は第１図に示すスピル弁が取り付けられた
燃料噴射ノズルの縦断面図、第３図および第４図
はそれぞれこの考案の他の実施例を示す縦断面図
、第５図および第６図はそれぞれこの考案のさら
に他の実施例を示す要部の断面図、第７図は従来
の等圧弁の一例を示す縦断面図である。２……弁本体、４……ピストン、５……球弁（
弁体）、７……ばね（弾性部材）、２２……シリ
ンダ室、２４……リーク孔（リーク通路）、２５
……スピル溝（スピル通路）、４１……連通孔、
４２……弁座、４４……貫通孔、４５……スピル
孔（スピル通路）、４６……スピル溝（スピル通
路）。 FIG. 1 is a longitudinal sectional view showing an embodiment of this invention.
FIG. 2 is a vertical sectional view of a fuel injection nozzle equipped with the spill valve shown in FIG. 1, FIGS. 3 and 4 are longitudinal sectional views showing other embodiments of this invention, and FIGS. FIG. 6 is a sectional view of a main part showing still another embodiment of this invention, and FIG. 7 is a longitudinal sectional view showing an example of a conventional equal pressure valve. 2... Valve body, 4... Piston, 5... Ball valve (
Valve body), 7... Spring (elastic member), 22... Cylinder chamber, 24... Leak hole (leak passage), 25
... Spill groove (spill passage), 41 ... Communication hole,
42... Valve seat, 44... Through hole, 45... Spill hole (spill passage), 46... Spill groove (spill passage).

Claims

[Scope of utility model registration request]

A valve body having a cylinder chamber formed therein, an inlet chamber slidably provided in the cylinder chamber of the valve body and connected to a fuel pressurizing means, and an outlet chamber connected to a fuel injection nozzle. a piston having a communication hole formed therein for communicating the inflow chamber and the outflow chamber; and the piston is biased from the inflow chamber side toward the outflow chamber side, and the biasing force is used to bias the piston toward the outflow chamber side. an elastic member that positions the piston at a stop position, and opens the communication hole when the pressure in the inflow chamber is higher than the pressure in the outflow chamber, and opens the communication hole when the pressure in the inflow chamber is lower than the pressure in the outflow chamber. is provided with a valve body that closes the communication hole, one end of which is connected to the low pressure side of a fuel tank, etc., and the other end of which is opened to the inner circumferential surface of the cylinder chamber; a leak passage closed by a sliding surface of the piston when the piston is in the stop position, and communicated with the outflow chamber when the piston moves against the biasing force of the valve spring; is provided in at least one of the valve body and the piston, and the movement of the piston against the valve spring causes a connection between the leak passage and the outflow chamber before the leak passage communicates with the outflow chamber. 1. A spill valve for a fuel injection device, characterized in that a spill passage is formed which communicates with a chamber and has a flow passage area smaller than a communication area between the leak passage and the outflow chamber.