JPH0411255U

JPH0411255U -

Info

Publication number: JPH0411255U
Application number: JP5222490U
Authority: JP
Priority date: 1990-05-21
Filing date: 1990-05-21
Publication date: 1992-01-30

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例による分配型燃料噴
射ポンプ１の要部拡大縦断面図、第２図ないし第
４図は同、作用を説明するための流路切換え弁３
２の部分の要部拡大断面図であつて、第２図はア
イドリング運転時の説明図、第３図は低速・中速
運転時の説明図、第４図は高速運転時の説明図、
第５図は同、回転数と静的送油率（ＧＩＲ）との
関係を示すグラフ、第６図はカム角度とカムリフ
トとの関係を示すグラフである。１……分配型燃料噴射ポンプ、２……ポンプハ
ウジング、３……分配ヘツド部、４……プランジ
ヤバレル、５……ポンプ室、６……プランジヤ、
６Ａ……プランジヤ６の段部、７……第１のプラ
ンジヤ室（圧送室）、８……カムデイスク、９…
…カムローラ、１０……コントロールスリーブ、
１１……吸入スリツト、１２……センタ孔、１３
……第１の分配スリツト、１４……第１のカツト
オフポート、１５……第２の分配スリツト、１６
……第２のカツトオフポート、１７……均圧スリ
ツト、１８……ポンプ室、１９……燃料通路、２
０……吸入ポート、２１……第１の分配ポート、
２２……第２の分配ポート、２３……環状の第２
のプランジヤ室（圧送室）、２４……逆止弁、２
５……リリーフ弁、２６……デリバリバルブ、２
７……バルブ収容室、２８……連通孔、２９……
第１の送油ポート、３０……第２の送油ポート、
３１……送油通路、３２……流路切換え弁、３３
……スプール型のバルブボデイ、３４……バルブ
スプリング、３５……調整シム、３６……リーク
燃料コネクタ、３７……タンク、３８……第１の
ランド、３９……第２のランド、４０……第３の
ランド、４１……第１の環状溝、４２……第２の
環状溝、Ｌ……高速時に第２のプランジヤ室２３
内の圧力によりダンパ効果を持たせるための段差
。 FIG. 1 is an enlarged vertical cross-sectional view of main parts of a distribution type fuel injection pump 1 according to an embodiment of the present invention, and FIGS.
FIG. 2 is an explanatory diagram of idling operation, FIG. 3 is an explanatory diagram of low-speed/medium-speed operation, and FIG. 4 is an explanatory diagram of high-speed operation.
FIG. 5 is a graph showing the relationship between the rotational speed and static oil transfer rate (GIR), and FIG. 6 is a graph showing the relationship between the cam angle and cam lift. DESCRIPTION OF SYMBOLS 1... Distribution type fuel injection pump, 2... Pump housing, 3... Distribution head part, 4... Plunger barrel, 5... Pump chamber, 6... Plunger,
6A... Step portion of plunger 6, 7... First plunger chamber (pressure feeding chamber), 8... Cam disc, 9...
...Cam roller, 10...Control sleeve,
11... Suction slit, 12... Center hole, 13
...first distribution slit, 14 ...first cut-off port, 15 ...second distribution slit, 16
... second cut-off port, 17 ... pressure equalization slit, 18 ... pump chamber, 19 ... fuel passage, 2
0... Suction port, 21... First distribution port,
22... second distribution port, 23... annular second
Plunger chamber (pressure feeding chamber), 24...Check valve, 2
5... Relief valve, 26... Delivery valve, 2
7...Valve accommodation chamber, 28...Communication hole, 29...
1st oil feeding port, 30... 2nd oil feeding port,
31... Oil feed passage, 32... Flow path switching valve, 33
... Spool type valve body, 34 ... Valve spring, 35 ... Adjustment shim, 36 ... Leak fuel connector, 37 ... Tank, 38 ... First land, 39 ... Second land, 40 ... Third land, 41...first annular groove, 42...second annular groove, L...second plunger chamber 23 at high speed
A step to create a damper effect due to the internal pressure.

Claims

[Claims for Utility Model Registration] A pump housing that forms a pump chamber and has a distribution head portion to which a delivery valve is attached, a suction port for fuel from the pump chamber that is attached to the pump housing, and a distribution head for this fuel. A distribution type fuel injection pump comprising: a plunger barrel having a port formed therein; and a plunger provided reciprocally and slidably within the plunger barrel and having a fuel suction slit, a distribution slit, and a cut-off port formed therein, the plunger comprising: A first pumping chamber and a second pumping chamber are formed in the barrel, and a first distribution port communicating with the first pumping chamber and a second distribution port communicating with the second pumping chamber are connected to the plunger barrel. A flow path switching valve is provided between the first and second distribution ports and the delivery valve, and the flow path switching valve is operated according to the pump rotation speed to control the first distribution port. A distribution type fuel injection pump characterized in that the port and the second distribution port can be switched by the flow path switching valve.