JPH01144466U

JPH01144466U -

Info

Publication number: JPH01144466U
Application number: JP3957388U
Authority: JP
Priority date: 1988-03-28
Filing date: 1988-03-28
Publication date: 1989-10-04

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例による燃料噴射ポン
プ３０の等圧弁３１の部分の要部縦断面図、第２
図は同、アイドリング時における燃料吸戻し状態
の要部断面図、第３図は同、その他の運転時にお
ける燃料吸戻し状態の要部断面図、第４図は同ア
イドリング時における従来の等圧弁２１および本
考案による燃料噴射ポンプ３０における等圧弁３
１の部分の模式的な説明図、第５図は同、高速運
転時における説明図、第６図は一般の燃料噴射ポ
ンプの高速運転時におけるカム回転角に対する噴
射管４内の圧力および噴射率のグラフ、第７図は
同、低速運転時のグラフ、第８図は従来のデリバ
リバルブ９を有する燃料噴射ポンプ１の縦断面図
、第９図は従来の等圧弁２１を有する燃料噴射ポ
ンプ２０の縦断面図、第１０図はノズル開弁圧に
対する残圧のグラフ、第１１図はノズル開弁圧に
対する噴射量のグラフである。１……燃料噴射ポンプ、２……デリバリバルブ
ホルダ、３……燃料出口、４……噴射管、５……
噴射ノズル、６……燃料噴射ポンプ本体、７……
デリバリチヤンバ、８……デリバリバルブシート
、９……デリバリバルブ、１０……デリバリバル
ブ９のロツド部、１１……デリバリバルブ９のシ
ート部、１２……デリバリバルブ９のリリーフバ
ルブ部、１３……デリバリバルブ９の羽根部、１
４……燃料吐出用通路、１５……スプリングスト
ツパ、１６……デリバリバルブセツトスプリング
、１７……デリバリバルブシートのシート面、１
８……アングライヒカツト、２０……燃料噴射ポ
ンプ、２１……等圧弁、２２……オリフイス、２
３……燃料吸戻し用通路、２４……チエツクボー
ル、２５……スプリング受け、２６……ボールシ
ート部材、２７……等圧弁セツトスプリング、２
８……切欠き、２９……Ｏリング、３０……燃料
噴射ポンプ、３１……等圧弁、３２……ボールシ
ート（第一のバルブボデイ）、３３……チエツク
ボール（第二のバルブボデイ）、３４……第一の
セツトスプリング、３５……オリフイス、３６…
…低速運転時用燃料吸戻し用通路、３７……スプ
リングシート、３８……第二のセツトスプリング
、ＰＯ１……ノズルの開弁圧の初期設定値、ＰＯ
２……ノズルの開弁圧の低下したある値、ｄ……
オリフイス３５の径、Ｄ……オリフイス２２の径
。 FIG. 1 is a vertical cross-sectional view of a main part of an equal pressure valve 31 of a fuel injection pump 30 according to an embodiment of the present invention, and FIG.
The figure is a cross-sectional view of the main part of the fuel sucking back state during idling, FIG. 21 and the equal pressure valve 3 in the fuel injection pump 30 according to the present invention
1 is a schematic explanatory diagram of part 1, FIG. 5 is an explanatory diagram of the same during high-speed operation, and FIG. 6 is a diagram showing the pressure inside the injection pipe 4 and the injection rate with respect to the cam rotation angle during high-speed operation of a general fuel injection pump. 7 is the same graph at low speed operation, FIG. 8 is a vertical cross-sectional view of the fuel injection pump 1 having a conventional delivery valve 9, and FIG. 9 is a graph of the fuel injection pump 20 having a conventional equal pressure valve 21. FIG. 10 is a graph of residual pressure versus nozzle opening pressure, and FIG. 11 is a graph of injection amount versus nozzle opening pressure. 1...Fuel injection pump, 2...Delivery valve holder, 3...Fuel outlet, 4...Injection pipe, 5...
Injection nozzle, 6...Fuel injection pump body, 7...
Delivery chamber, 8...Delivery valve seat, 9...Delivery valve, 10...Rod part of delivery valve 9, 11...Seat part of delivery valve 9, 12...Relief valve part of delivery valve 9, 13... ...Blade portion of delivery valve 9, 1
4... Fuel discharge passage, 15... Spring stopper, 16... Delivery valve set spring, 17... Seat surface of delivery valve seat, 1
8... Angle head cutter, 20... Fuel injection pump, 21... Equal pressure valve, 22... Orifice, 2
3... Fuel suction and return passage, 24... Check ball, 25... Spring receiver, 26... Ball seat member, 27... Equal pressure valve set spring, 2
8... Notch, 29... O-ring, 30... Fuel injection pump, 31... Equal pressure valve, 32... Ball seat (first valve body), 33... Check ball (second valve body), 34 ...First set spring, 35...Orifice, 36...
... Fuel suction and return passage for low speed operation, 37 ... Spring seat, 38 ... Second set spring, PO1 ... Initial setting value of nozzle opening pressure, PO
2... A certain value at which the nozzle opening pressure has decreased, d...
Diameter of orifice 35, D...Diameter of orifice 22.

Claims

[Scope of Claim for Utility Model Registration] An equal pressure valve device provided in a delivery valve that opens and closes a fuel outlet from a fuel injection pump to an injection pipe in a diesel engine, which opens and closes a fuel suction and return passage formed in the delivery valve; a first valve body forming an orifice and a fuel suction return passage for low speed operation; a second valve body that opens and closes the fuel suction return passage for low speed operation of the first valve body; and the first valve body. An equal pressure valve device for a fuel injection pump, comprising: a first set spring that biases the second valve body in the valve closing direction; and a second set spring that biases the second valve body in the valve closing direction.