JPS6058865U

JPS6058865U - fuel injector

Info

Publication number: JPS6058865U
Application number: JP14236084U
Authority: JP
Inventors: ヘルムート・チエーケ
Original assignee: ローベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング
Priority date: 1983-09-24
Filing date: 1984-09-21
Publication date: 1985-04-24
Also published as: DE3334619A1; DE3334619C2; JPH0526300Y2

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]

図面は本考案の実施例を示すものであって、第１図は液
力式の補助ポンプを概略的に示した部分断面図、第２図
は貯蔵ピストン内での前噴射ピストンの支承形式の部分
断面図、第３図は前噴射ピストンの別の支承形式の部分
断面図である。１０・・・・・・前噴射補助ポンプ、１１・・・・・・
ケーシング、１２　ａ、　　１２　ｂ＝範囲、１３．　
１４−−−−−−シールねじ、１５，１５Ｉ・・・・・
・貯蔵ピストン、１６．１７・・・・・・流入孔、１８
・・・・・・低圧搬送ポンプ、１９、　２１．４４・・
・・・・横孔、１９Ｉ・・曲流入横通路、２０・・・・
・・作業室、２２，３３，２２ＩＩ、５１・・・・・・
孔、２３，２３Ｉ、２３ＩＩ・・・川筋噴射ピストン、
２３ａＩ・・・・・・前方部分、２３ｂＩ・・曲後方部
分、２４・・・・・・挿入体、２５・・・・・・支持ピ
ストン、２６．３１・・・・・・プレロードばね、２７
・・・・・・段部、２　８・・・・・・調節ねじ、２９
・・曲内側四角形縁部、３゜・・・・・・脚部分、３２
・・・・・・切欠き、３４・・・・・・孔部分、３５、
　３５１１・・・・・・閉鎖ねじ、３６・・・・・・環
状壁、３７・・・・・・流出横孔、３８・・・・・・前
噴射流出孔、３９・・・・・・前噴射ノズル、４０・・
・・・・主噴射ノズル、４１・・・・・・接続導管、４
２・・・・・・圧力流出部、４３・・・・・・圧力室、
４５・・・・・・縦孔、４６，４７ａ、５６・曲・制御
縁、４７・・・・・・環状溝、４８・・・・・・前方部
分、４９・・・・・・内孔部分範囲、５０・・・・・・
傾斜孔、５２・・・・・・移行層、５３・・・・・・ヘ
ッド部分、５４・・・・・・延長部、５５・・・・・・
ストッパ。The drawings show an embodiment of the invention, in which FIG. 1 is a schematic partial sectional view of a hydraulic auxiliary pump, and FIG. 2 shows the type of support for the pre-injection piston in the storage piston. FIG. 3 is a partial sectional view of another type of support for the front injection piston. 10... Front injection auxiliary pump, 11...
casing, 12 a, 12 b = range, 13.
14---Seal screw, 15, 15I...
・Storage piston, 16.17...Inflow hole, 18
...Low pressure transfer pump, 19, 21.44...
...Horizontal hole, 19I...Curved inflow side passage, 20...
...Work room, 22, 33, 22II, 51...
Hole, 23, 23I, 23II...river injection piston,
23aI...Front part, 23bI...Bending rear part, 24...Insert, 25...Support piston, 26.31...Preload spring, 27
...Stepped portion, 2 8...Adjustment screw, 29
...Curved inner square edge, 3゜...Leg part, 32
...Notch, 34... Hole part, 35,
3511... Closing screw, 36... Annular wall, 37... Outflow horizontal hole, 38... Front injection outflow hole, 39... Front injection nozzle, 40...
...Main injection nozzle, 41... Connection conduit, 4
2...Pressure outflow section, 43...Pressure chamber,
45... Vertical hole, 46, 47a, 56 Curved/control edge, 47... Annular groove, 48... Front part, 49... Inner hole Partial range, 50...
Inclined hole, 52...Transition layer, 53...Head portion, 54...Extension portion, 55...
Stopper.

Claims

[Scope of Claim for Utility Model Registration] 1. A fuel injection device for an internal combustion engine having a pre-injection mechanism and a main injection mechanism, which comprises a main injection nozzle 40 to which the main injection amount is supplied from a high-pressure injection pump, and a high-pressure injection pump. Hydraulic pre-injection auxiliary pump 1 driven by the conveying pressure of
0, and the pre-injection auxiliary pump has a piston and a working chamber placed in front of the piston and supplied with fuel from a low-pressure transfer pump, and the pre-injection amount is supplied from the working chamber. In the type that is pushed away toward the front injection nozzle, the front injection pistons 23, 23I, 2
3I is slidably mounted in a bore 22, 22I of a storage piston 15, 15I, 15II which is mounted displaceably in the casing 11 of the pre-injection auxiliary pump. 2 Storage pistons 15, 15I, 15II are working chambers 20.20II for pre-injection pistons 23, 23II, 23n
transverse passages or transverse holes 21, 19, 37 as inlet or outlet conduits to and to the pressure side of the back side of the pre-injection piston loaded by the conveying pressure of the high-pressure injection pump;
A fuel injection device according to claim 1, which has the following features. 3. Inside the storage pistons 15, 151, 15I are provided internal connecting conduits 44, 45, which are connected to the pressure chamber 43 formed by the casing 11 of the auxiliary pump, which is bounded by the storage piston. and the pressure chamber is connected to the main injection nozzle 40, furthermore such that the inner connecting conduit is opened by the control lip 46 of the pre-injection piston 23.23I, 23II itself during the pre-injection stroke. Scope of Claims for Utility Model Registration No. 1
The fuel injection device according to item 1 or 2. 4. The casing 11 of the hydraulic auxiliary pump is formed into a substantially cylindrical shape together with the seal screws 13 and 14 on both sides,
Furthermore, on the side opposite to the pressure chamber 43 of the storage piston, the position can be adjusted as a stop for the storage piston in order to measure the time interval between the pre-injection and the main injection and the pre-given suction capacity. Utility model registration claim 1 is provided with a support piston 25 fixed to a casing.
3. The fuel injection device according to any one of items 3 to 3. 5 Utility model registration in which the supporting piston 25 is part of the adjusting screw 28 or is the adjusting screw itself, and in the space between the adjusting screw 28 and the storage piston a preload spring 26 for the storage piston is arranged A fuel injection device according to claim 4. 6 Pre-injection start and pre-injection amount are pre-injection piston 23.
23I, 23II control edges 56, 47a. The fuel injection device according to any one of claims 1 to 5, defined by the control edges 56, 47a of 23I and 23II. 7. Any one of claims 1 to 6 of the utility model registration claim in which the front injection piston 23I is configured as stepped pistons 23aII and 23bI for pressure transmission.
The fuel injection device described in Section 1. 8. The fuel injection device according to any one of claims 1 to 7, wherein the stroke of the front injection piston is defined by the first and second thrusters 24, 36. 9 Utility model in which the first stop is formed by an insert 24 movably supported in the bore 22 of the storage piston 15 receiving the pre-injection piston 23, which insert is supported on the support piston 25. A fuel injection device according to registered claim 8. 10 The front injection piston 23II has a thick head portion 53
is in contact with the shoulder 52 of the inner bore 22I of the storage piston to the first stop so that the head oil covers the bearing hole 22I for the front injection piston 23n, and at the same time The fuel injection according to any one of claims 1 to 7 of the claims 1 to 7, which is adapted to come into contact with the front stomper 55 inside the inner hole of the storage piston due to the stroke limitation. Device.