JP2014199021A5

JP2014199021A5 -

Info

Publication number: JP2014199021A5
Application number: JP2013074209A
Authority: JP
Filing date: 2013-03-29
Publication date: 2016-04-28
Anticipated expiration: 2033-03-29

Description

上記発明において、前記燃料噴射孔は、前記ハウジングにて軸方向に上段燃料噴射孔と下段燃料噴射孔が設けられ、前記スプール弁内部に、前記スプール弁の下方の空間に燃料を供給する第２燃料供給路が形成され、前記燃料供給路の開放時に、前記燃料油導入空間が前記溝部と連通し、かつ、前記燃料油導入空間が前記上段燃料噴射孔と連通する位置に移動するとともに前記スプール弁の下方の空間は、前記溝部と連通し、かつ、前記スプール弁の下方の空間が前記下段燃料噴射孔と連通してもよい。 In the above invention, the fuel injection hole is provided with an upper fuel injection hole and a lower fuel injection hole in the axial direction in the housing, and the fuel is supplied to the space below the spool valve inside the spool valve . A fuel supply path is formed, and when the fuel supply path is opened, the fuel oil introduction space communicates with the groove, and the fuel oil introduction space moves to a position where it communicates with the upper fuel injection hole. A space below the valve may communicate with the groove, and a space below the spool valve may communicate with the lower fuel injection hole.

以下に、本発明に係る実施形態について、図面を参照して説明する。
［第１実施形態］
本発明の第１実施形態に係る燃料噴射装置１０について説明する。燃料噴射装置１０は、例えば２サイクル型の船舶用大型ディーゼル機関等の内燃機関に適用される。
燃料噴射装置１０は、円筒形状を有するハウジング１４が内燃機関のシリンダヘッド１２に設置される。図１は、本発明の第１実施形態に係る燃料噴射装置を示す概略図及び縦断面図であり、ニードル弁２６の閉弁時を示す。図２は、ニードル弁２６の開弁時を示す。
Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
A fuel injection device 10 according to a first embodiment of the present invention will be described. The fuel injection device 10 is applied to an internal combustion engine such as a two-cycle marine large diesel engine.
In the fuel injection device 10, a cylindrical housing 14 is installed on a cylinder head 12 of an internal combustion engine. FIG. 1 is a schematic view and a longitudinal sectional view showing a fuel injection device according to a first embodiment of the present invention, and shows a state in which a needle valve 26 is closed. Figure 2 shows the time valve opening of the needle valve 26.

Claims

A housing in which a fuel supply path is formed and a fuel injection hole is formed at the tip;
A needle valve that is disposed inside the housing and opens and closes the fuel supply path in accordance with fuel oil pressure;
A spool valve provided at a tip of the needle valve and having an outer peripheral surface sliding in contact with an inner peripheral surface of the housing;
A groove formed at a position different from the fuel injection hole on the inner peripheral surface of the housing, and communicated with the fuel supply path;
With
A fuel oil introduction space through which fuel oil flows is formed in the spool valve,
When the fuel supply path is opened, the fuel oil introduction space communicates with the groove, and the fuel oil introduction space moves to a position where it communicates with the fuel injection hole.
A fuel injection device in which an outer peripheral surface of the spool valve faces the fuel injection hole and the fuel oil introduction space moves to a position not communicating with the fuel injection hole when the fuel supply path is closed.

2. The fuel injection device according to claim 1, wherein an upper outer peripheral surface of the spool valve is always in contact with an inner peripheral surface of the housing in an opening / closing operation of the fuel supply path.

The fuel injection device according to claim 1 or 2, wherein the fuel oil introduction space is formed in an annular shape by the spool valve.

The fuel injection hole is provided with an upper fuel injection hole and a lower fuel injection hole in the housing in the axial direction,
A second fuel supply path for supplying fuel to a space below the spool valve is formed inside the spool valve,
When the fuel supply path is opened, the fuel oil introduction space communicates with the groove, and the fuel oil introduction space moves to a position where it communicates with the upper fuel injection hole. The fuel injection device according to any one of claims 1 to 3, wherein a space below the spool valve communicates with the groove and communicates with the lower fuel injection hole.

The said groove part is formed in multiple numbers by the internal peripheral surface of the said housing, The said multiple groove parts are provided in the internal peripheral surface of the said housing at equal intervals. Fuel injection device.

The fuel injection device according to any one of claims 1 to 5, wherein the groove portion and the fuel injection hole are formed at a distance equal to or larger than a diameter of the fuel injection hole.

A diesel engine comprising the cylinder head provided with the fuel injection device according to any one of claims 1 to 6.