JPH0212058U

JPH0212058U -

Info

Publication number: JPH0212058U
Application number: JP8892788U
Authority: JP
Priority date: 1988-07-04
Filing date: 1988-07-04
Publication date: 1990-01-25

Description

[Brief explanation of drawings]

第１図は本考案一実施例のパイロツト噴射装置
の断面図、第２図は同じくそのパイロツト噴射装
置を備えた燃料噴射ポンプの概略構成図、第３図
、第４図、第５図は本考案のその他の実施例のパ
イロツト噴射装置の主要部断面図である。１……燃料噴射ポンプ、１０……プランジヤ室
、２０……パイロツト噴射装置、５１……アキユ
ームレートピストン、５１ａ……環状溝、５１ｂ
……螺旋溝、５２……アキユームレートピストン
ガイド、５２ａ……摺動部、６１……油溜り、６
２……低圧室、６３……背圧室。 Fig. 1 is a sectional view of a pilot injection device according to an embodiment of the present invention, Fig. 2 is a schematic configuration diagram of a fuel injection pump similarly equipped with the pilot injection device, and Figs. 3, 4, and 5 are illustrations of this invention. FIG. 7 is a cross-sectional view of the main parts of a pilot injection device according to another embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Fuel injection pump, 10... Plunger chamber, 20... Pilot injection device, 51... Accumulation rate piston, 51a... Annular groove, 51b
...Spiral groove, 52...Accumulation rate piston guide, 52a...Sliding part, 61...Oil reservoir, 6
2...Low pressure chamber, 63...Back pressure chamber.

Claims

[Scope of Claim for Utility Model Registration] An accumulation rate piston guide that communicates with a pressurizing chamber of a fuel injection pump and has a fuel filling part near the communication part; An accumulation rate piston that presses and moves inside the accumulation rate piston guide as fuel pressure increases in the pressurizing chamber; and a back pressure chamber that communicates with the accumulation rate piston guide and controls movement of the accumulation rate piston. A pilot injection device for a fuel injection pump comprising: an opening provided around the sliding surface of the accumulation rate piston that does not face the fuel filling section; and an opening communicating with the back pressure chamber. A pilot injection device for a fuel injection pump, characterized in that a passage is disposed in the accumulation rate piston.