JPS5862169U

JPS5862169U - Throttle type fuel injection valve for diesel engine

Info

Publication number: JPS5862169U
Application number: JP15690881U
Authority: JP
Inventors: 孝男鈴木
Original assignee: トヨタ自動車株式会社
Priority date: 1981-10-23
Filing date: 1981-10-23
Publication date: 1983-04-26
Also published as: JPS614065Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の噴射弁のニードル弁リフトの各段階を示
す図、第２図はニードル弁リフトに対する噴孔流量を模
式的に示したグラフ、第３図は本　　　′考案の一実施
例の一部拡大断面図、第４図は第３図の実施例の変形例
を示す図、第５図は本考案の他の実施例の一部拡大断面
図である。１０・・・ニードル弁、１２・・・ニードル弁のノズル
チップ、１４・・・ノズルボデー、１６・・・噴孔、１
８・・・円柱形切欠、２０．２８・・・形状記憶合金の
絞りリング、２７・・・副噴孔、２４・・・透孔、２６
・・・環状溝。＼Fig. 1 is a diagram showing each stage of the needle valve lift of a conventional injection valve, Fig. 2 is a graph schematically showing the injection hole flow rate with respect to the needle valve lift, and Fig. 3 is a diagram showing an embodiment of the present invention. FIG. 4 is a partially enlarged sectional view showing a modification of the embodiment of FIG. 3, and FIG. 5 is a partially enlarged sectional view of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 10... Needle valve, 12... Nozzle tip of needle valve, 14... Nozzle body, 16... Nozzle hole, 1
8...Cylindrical notch, 20.28...Shape memory alloy aperture ring, 27...Sub-nozzle hole, 24...Through hole, 26
...Annular groove. \

Claims

[Claims for Utility Model Registration] 1. A needle valve having a throttle type nozzle tube;
The nozzle tip is equipped with a nozzle body having a nozzle hole that is loosely penetrated, and the flow rate of the nozzle hole is regulated by the cross-sectional area of the annular gap between the outer peripheral surface of the nozzle chip and the inner peripheral surface of the nozzle hole. In a throttle-type fuel injection valve for a diesel engine, it is sensitive to the temperature at the lower part of the injection valve, and when the temperature is below a set value, it does not substantially interfere with the cross-sectional size of the clearance; when the temperature is above the set value, A shape memory alloy aperture ring that can reduce the cross-sectional area of the gap is provided at the bottom of the injection valve, thereby making it possible to reduce the injection hole flow rate during the initial stroke of the needle valve lift when the engine is under high load. Throttle type fuel injection valve for diesel engines. 2. The fuel injection valve according to claim 1, wherein the nozzle body has a cylindrical notch concentric with the nozzle hole provided in the lower edge of the nozzle body, and the aperture ring is disposed within the notch. 3 The nozzle body has a sub-nozzle hole substantially parallel to the nozzle hole,
The throttle ring has a through hole aligned with the sub-nozzle hole, and the throttle ring is configured to reduce the cross-sectional area of the through hole when the temperature is above the set value. A fuel injection valve according to claim 2 of the utility model registration claim. 4. The fuel injection valve according to claim 1, wherein an annular groove is provided on the outer peripheral surface of the nozzle tip, and the aperture ring is disposed within the annular groove.