JPS62148773U

JPS62148773U -

Info

Publication number: JPS62148773U
Application number: JP3598386U
Authority: JP
Priority date: 1986-03-12
Filing date: 1986-03-12
Publication date: 1987-09-19

Description

[Brief explanation of the drawing]

第１図乃至第４図は本考案の一実施例を示し、
第１図は本実施例のパイロツト噴射装置の構成を
表わす断面図、第２図はこのパイロツト噴射装置
に用いられる燃料噴射ポンプの構成を表わす断面
図、第３図ａ〜ｅはリリース孔の形状を示す断面
図、第４図ａ〜ｄは、アキユムレートピストンの
移動量と移動速度の関係を示すグラフである。１……燃料噴射ポンプ、１７……加圧室、２０
……パイロツト噴射装置、４３……アキユムレー
トピストン、４４……シリンダ、４５……ストツ
パ、４６……スプリング、５５……背後室、５６
……ダンピングシリンダ、５７……ダンピングピ
ストン、６２……リリース孔。 1 to 4 show an embodiment of the present invention,
Fig. 1 is a sectional view showing the configuration of the pilot injection device of this embodiment, Fig. 2 is a sectional view showing the configuration of the fuel injection pump used in this pilot injection device, and Figs. 3 a to e show the shape of the release hole. 4A to 4D are graphs showing the relationship between the amount of movement and the speed of movement of the accumulation piston. 1... Fuel injection pump, 17... Pressurization chamber, 20
... Pilot injection device, 43 ... Accumulate piston, 44 ... Cylinder, 45 ... Stopper, 46 ... Spring, 55 ... Back chamber, 56
...damping cylinder, 57 ... damping piston, 62 ... release hole.

Claims

[Scope of Claim for Utility Model Registration] A cylinder connected to a pressurizing chamber of a fuel injection pump through a communication hole, and an accumulator that is inserted into the cylinder and is pressed and moved by the fuel pressure in the pressurizing chamber. a piston; a rear chamber provided in communication with the rear of the cylinder; a spring provided in the rear chamber to press and bias the accumulation piston toward the pressurizing chamber via a pressure pin; a stopper for restricting the amount of movement of the umrate piston by fuel pressure in the pressurizing chamber; and a pilot injection device for performing pilot injection before main fuel injection of the fuel injection pump, wherein the rear chamber is provided with a damping cylinder that communicates with the fuel low pressure chamber via a return passage, and a damping piston interlocked with the accumulation piston is inserted into the damping cylinder via the pressure pin, and further a part of the damping cylinder is provided with a damping cylinder that communicates with the fuel low pressure chamber through a return passage. A pilot injection device for a fuel injection pump, characterized in that a release hole is formed that is opened and closed by the damping piston and allows the fuel in the rear chamber to flow into the damping cylinder.