JPH0821334A - Fuel injection device of diesel engine - Google Patents

Fuel injection device of diesel engine

Info

Publication number
JPH0821334A
JPH0821334A JP15334094A JP15334094A JPH0821334A JP H0821334 A JPH0821334 A JP H0821334A JP 15334094 A JP15334094 A JP 15334094A JP 15334094 A JP15334094 A JP 15334094A JP H0821334 A JPH0821334 A JP H0821334A
Authority
JP
Japan
Prior art keywords
fuel injection
plunger
pump
injection pump
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15334094A
Other languages
Japanese (ja)
Other versions
JP2952746B2 (en
Inventor
Yasushi Matsuda
康 松田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP6153340A priority Critical patent/JP2952746B2/en
Publication of JPH0821334A publication Critical patent/JPH0821334A/en
Application granted granted Critical
Publication of JP2952746B2 publication Critical patent/JP2952746B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00Engines characterised by air compression and subsequent fuel addition
    • F02B3/06Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE:To prevent disorder of the injection beginning timing of the fuel injection pump in a fuel injection device of a diesel engine by lifting a plunger while maintaining the condition of an automatic expanding/contracting mechanism after the operation. CONSTITUTION:The descent of a plunger 9 is stopped based on the fact that an engaging part 15 is received with a stopper part 14 in a fuel injection pump 5, and under the condition of maintaining this stop condition, a tappet 11 is stuck to the base circle part 17 of a cam part by expansion/contraction of an automatic expanding/contracting mechanism 16. Hereby, the bottom dead center of the plunger 9 is decided only based on the fact that the engaging part 15 is received with the stopper part 14, even if there is an error in a separated measure 20 from the flange part 6 of the fuel injection pump 5 for a pump receiving case 1 to the base circle part 17 of the cam part 10, relative position between the fuel through hole 12 of a sleeve 8 and the top face 19 of the plunger 9 at the bottom dead center is always fixed, and there is no possibility generating disorder in the prestroke 18 of the plunger 9.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ディーゼルエンジンの
燃料噴射装置に関し、詳しくは、燃料噴射ポンプの噴射
開始時期の狂いを防止できるものに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for a diesel engine, and more particularly to a device capable of preventing the injection start timing of a fuel injection pump from being misaligned.

【0002】[0002]

【従来技術】ディーゼルエンジンの燃料噴射装置の従来
技術として図3に示すものがある。これは、本発明と同
様、次のような基本構造を備えている。すなわち、ホン
プ収容ケース101内に噴射ポンプカム軸102を架設
し、ポンプ収容ケース101のケース壁103にポンプ
差し込み口104をあけ、このポンプ差し込み口104
からポンプ収容ケース101内に燃料噴射ポンプ105
を差し込み、燃料噴射ポンプ105のフランジ部106
をポンプ差し込み口104の開口周縁部107に着座さ
せて組み付けてある。
2. Description of the Related Art A conventional fuel injection device for a diesel engine is shown in FIG. Like the present invention, it has the following basic structure. That is, the injection pump cam shaft 102 is installed in the hoop housing case 101, the pump insertion port 104 is opened in the case wall 103 of the pump housing case 101, and the pump insertion port 104 is formed.
From the fuel injection pump 105 into the pump housing case 101
And the flange portion 106 of the fuel injection pump 105.
Is attached to the opening peripheral edge portion 107 of the pump insertion port 104 and assembled.

【0003】そして、燃料噴射ポンプ105にスリーブ
108を内設し、スリーブ108にプランジャ109を
内嵌し、噴射ポンプカム軸102のカム部110からタ
ペット111を介してプランジャ109を昇降駆動でき
るように構成し、スリーブ108の周側壁に燃料通過口
112をあけ、プランジャ109の周側面に燃料噴射量
を調節する斜溝113を形成して構成してある。
A sleeve 108 is provided in the fuel injection pump 105, a plunger 109 is fitted in the sleeve 108, and the plunger 109 can be vertically moved from a cam portion 110 of the injection pump cam shaft 102 via a tappet 111. Then, the fuel passage port 112 is opened in the peripheral side wall of the sleeve 108, and the inclined groove 113 for adjusting the fuel injection amount is formed in the peripheral side surface of the plunger 109.

【0004】このような基本構造を備えた燃料噴射装置
では、噴射ポンプカム軸102のカム部110のリフト
によってプランジャ109が上昇し、燃料噴射が行われ
る。すなわち、プランジャ109が下死点から燃料通過
口112を塞ぐまでのプレストローク118が終了した
時点で燃料噴射が開始され、プランジャ109の斜溝1
13が燃料通過口112と連通した時点で燃料噴射が終
了する。プランジャ109のプレストローク118は、
下死点におけるプランジャ109の頂面119とスリー
ブ108の燃料通過口112との相対位置によって定ま
る。
In the fuel injection device having such a basic structure, the plunger 109 is lifted by the lift of the cam portion 110 of the injection pump cam shaft 102 to inject fuel. That is, fuel injection is started at the time when the pre-stroke 118 from the bottom dead center of the plunger 109 to the closing of the fuel passage port 112 is completed, and the oblique groove 1 of the plunger 109 is started.
Fuel injection ends when 13 communicates with the fuel passage port 112. The pre-stroke 118 of the plunger 109 is
It is determined by the relative position between the top surface 119 of the plunger 109 and the fuel passage port 112 of the sleeve 108 at the bottom dead center.

【0005】図3に示す従来技術では、プランジャ10
9のプレストローク118の設定に狂いが生じやすい。
その理由は次の通りである。すなわち、この従来技術で
は、スリーブ108の燃料通過口112の位置はポンプ
差し込み口104の開口周縁部107への燃料噴射ポン
プ105のフランジ部106の取り付け状態によって定
まり、プランジャ109の下死点はタペット111がカ
ム部110の基礎円部分117に受け止められることに
基づいて定まる構造になっている。
In the prior art shown in FIG. 3, the plunger 10 is used.
The setting of the prestroke 118 of 9 is likely to be wrong.
The reason is as follows. That is, in this conventional technique, the position of the fuel passage port 112 of the sleeve 108 is determined by the attachment state of the flange portion 106 of the fuel injection pump 105 to the opening peripheral portion 107 of the pump insertion port 104, and the bottom dead center of the plunger 109 is the tappet. The structure is determined based on the fact that 111 is received by the base circle portion 117 of the cam portion 110.

【0006】このため、燃料噴射ポンプ105のフラン
ジ部106からカム部110の基礎円部分117までの
離隔寸法120が常に一定であれば、下死点におけるプ
ランジャ109の頂面119とスリーブ108の燃料通
過口112との相対位置は常に一定し、プランジャ10
9のプレストローク118に狂いが生じる余地はない
が、実際には、ポンプ収容ケース101や燃料噴射カム
軸102の製造誤差等に基づいて上記離隔寸法120に
誤差が生じるため、プレストローク118に狂いが生じ
る。
Therefore, if the separation dimension 120 from the flange portion 106 of the fuel injection pump 105 to the base circular portion 117 of the cam portion 110 is always constant, the fuel of the top surface 119 of the plunger 109 and the fuel of the sleeve 108 at bottom dead center is maintained. The relative position to the passage port 112 is always constant, and the plunger 10
Although there is no room for deviation in the prestroke 118 of No. 9, in reality, there is an error in the above-mentioned separation dimension 120 based on manufacturing errors of the pump housing case 101 and the fuel injection cam shaft 102, etc. Occurs.

【0007】プレストローク118が狂うと、燃料の噴
射開始時期が狂い、排気ガス成分や出力が変わってくる
不都合があるため、この従来技術では、厚さの異なる複
数種の修正用シム121を用意しておき、噴射テストに
より噴射開始時期の狂いを確かめながら、適当な厚さの
修正用シム121を選択して、フランジ部106と開口
周縁部107との間に挟み、上記離隔寸法120の誤差
を修正して、噴射開始時期の狂いを修正している。
If the pre-stroke 118 goes wrong, the fuel injection start timing will go wrong, and the exhaust gas component and output will change. Therefore, in this conventional technique, a plurality of types of correction shims 121 having different thicknesses are prepared. Incidentally, while confirming the deviation of the injection start timing by the injection test, the correction shim 121 having an appropriate thickness is selected and sandwiched between the flange portion 106 and the opening peripheral edge portion 107, and the error of the separation dimension 120 is increased. Is corrected to correct the deviation of the injection start timing.

【0008】[0008]

【発明が解決しようとする課題】上記従来技術では、次
の問題〜がある(図3参照)。 燃料噴射ポンプ105のフランジ部106とポンプ差
し込み口104の開口周縁部107との間に修正用シム
121を挟んで、噴射開始時期の修正を行うが、フラン
ジ部106を開口周縁部107に取り付けるネジ具12
2の締め付け圧の程度等によって修正用シム121の厚
さが変動するため、噴射開始時期の修正を正確に行うこ
とは困難である。
The above-mentioned prior art has the following problems (see FIG. 3). A correction shim 121 is inserted between the flange portion 106 of the fuel injection pump 105 and the opening peripheral edge portion 107 of the pump insertion port 104 to correct the injection start timing, but a screw for attaching the flange portion 106 to the opening peripheral edge portion 107 is used. Ingredient 12
Since the thickness of the correction shim 121 varies depending on the degree of the tightening pressure of 2, etc., it is difficult to accurately correct the injection start timing.

【0009】噴射テストにより噴射開始時期の狂いを
確認したうえで、修正用シム121をフランジ部106
と開口周縁部107との間に挟み込むので、噴射テスト
後に燃料噴射ポンプ105の取り外しと再取り付けを必
要とし、噴射開始時期の修正作業が繁雑である。
After confirming the deviation of the injection start timing by the injection test, the correction shim 121 is attached to the flange portion 106.
Since it is sandwiched between the fuel injection pump 105 and the opening peripheral portion 107, it is necessary to remove and reattach the fuel injection pump 105 after the injection test, and the work of correcting the injection start timing is complicated.

【0010】複数種の修正用シム121を用意してお
く必要があるため、部品管理が繁雑になる。
Since it is necessary to prepare a plurality of types of correction shims 121, parts management becomes complicated.

【0011】本発明の課題は、ディーゼルエンジンの燃
料噴射装置において、燃料噴射ポンプの噴射開始時期の
狂いを防止できるものを提供することにある。
An object of the present invention is to provide a fuel injection device for a diesel engine, which can prevent deviation of the injection start timing of the fuel injection pump.

【0012】[0012]

【課題を解決するための手段】本発明は、図1に例示す
るように、ホンプ収容ケース1内に噴射ポンプカム軸2
を架設し、ポンプ収容ケース1のケース壁3にポンプ差
し込み口4をあけ、このポンプ差し込み口4からポンプ
収容ケース1内に燃料噴射ポンプ5を差し込み、燃料噴
射ポンプ5のフランジ部6をポンプ差し込み口4の開口
周縁部7に着座させて組み付け、燃料噴射ポンプ5にス
リーブ8を内設し、スリーブ8にプランジャ9を内嵌
し、噴射ポンプカム軸2のカム部10からタペット11
を介してプランジャ9を昇降駆動できるように構成し、
スリーブ8の周側壁に燃料通過口12をあけ、プランジ
ャ9の周側面に燃料噴射量を調節する斜溝13を形成し
て構成した、ディーゼルエンジンの燃料噴射装置におい
て、次のようにしたことを特徴とする。
The present invention, as illustrated in FIG. 1, includes an injection pump cam shaft 2 in a hoop housing case 1.
A pump insertion port 4 is opened in the case wall 3 of the pump housing case 1, the fuel injection pump 5 is inserted into the pump housing case 1 through the pump insertion port 4, and the flange portion 6 of the fuel injection pump 5 is inserted into the pump. The fuel injection pump 5 is internally fitted with a sleeve 8, the plunger 9 is fitted in the sleeve 8, and the cam portion 10 of the injection pump cam shaft 2 is tapped to the tappet 11.
It is configured so that the plunger 9 can be driven up and down via
In the fuel injection device of the diesel engine, which is configured by forming the fuel passage port 12 on the peripheral side wall of the sleeve 8 and forming the oblique groove 13 for adjusting the fuel injection amount on the peripheral side surface of the plunger 9, the following is performed. Characterize.

【0013】すなわち、燃料噴射ポンプ5内にストッパ
部14を設け、プランジャ9に係合部15を設け、スト
ッパ部14に係合部15が受け止められることに基づい
て、プランジャ9の下降が停止されるように構成し、プ
ランジャ9とタペット11との間に自動伸縮機構16を
介在させ、係合部15をストッパ部14に受け止めさせ
たまま、タペット11をカム部10の基礎円部分17に
密着させるように、自動伸縮機構16が伸縮作動し、自
動伸縮機構16が伸縮作動後の状態を維持したままカム
部10でリフトされるように構成したことを特徴とす
る。
That is, since the stopper portion 14 is provided in the fuel injection pump 5, the engaging portion 15 is provided in the plunger 9, and the engaging portion 15 is received by the stopper portion 14, the descent of the plunger 9 is stopped. With the automatic expansion mechanism 16 interposed between the plunger 9 and the tappet 11, the tappet 11 is brought into close contact with the basic circular portion 17 of the cam portion 10 while the engaging portion 15 is being received by the stopper portion 14. As described above, the automatic expansion and contraction mechanism 16 is expanded and contracted, and the automatic expansion and contraction mechanism 16 is lifted by the cam portion 10 while maintaining the state after the expansion and contraction operation.

【0014】[0014]

【作用】本発明によれば、図1に例示するように、燃料
噴射ポンプ5内のストッパ部14に係合部15が受け止
められることに基づいてプランジャ9の下降が停止さ
れ、この停止状態が維持されたまま自動伸縮機構16の
伸縮によりタペット11がカム部10の基礎円部分17
に密着する。
According to the present invention, as illustrated in FIG. 1, the lowering of the plunger 9 is stopped on the basis of the engagement portion 15 being received by the stopper portion 14 in the fuel injection pump 5, and this stop state is While being maintained, the tappet 11 is expanded and contracted by the automatic expansion and contraction mechanism 16 so that the base circular portion 17 of the cam portion 10 is maintained.
Stick to.

【0015】このため、プランジャ9の下死点は、スト
ッパ部14にプランジャ9の係合部15が受け止められ
ることのみに基づいて定まり、ポンプ収容ケース1への
燃料噴射ポンプ5の取り付け状態とは無関係になる。こ
のため、燃料噴射ポンプ5のフランジ部6からカム部1
0の基礎円部分17までの離隔寸法20に誤差があって
も、スリーブ8の燃料通過口12と下死点におけるプラ
ンジャ9の頂面19の相対位置は常に一定し、プランジ
ャ9のプレストローク18に狂いが生じる余地がない。
カム部10によるリフト中、自動伸縮機構10は伸縮せ
ず、伸縮作動後の状態を維持する。
Therefore, the bottom dead center of the plunger 9 is determined only by the fact that the stopper portion 14 receives the engaging portion 15 of the plunger 9, and the mounting state of the fuel injection pump 5 in the pump housing case 1 is not determined. Get irrelevant. Therefore, from the flange portion 6 of the fuel injection pump 5 to the cam portion 1
Even if there is an error in the separation dimension 20 up to the base circle portion 17 of 0, the relative position between the fuel passage port 12 of the sleeve 8 and the top surface 19 of the plunger 9 at the bottom dead center is always constant, and the prestroke 18 of the plunger 9 There is no room for madness.
During the lift by the cam portion 10, the automatic expansion and contraction mechanism 10 does not expand and contract and maintains the state after the expansion and contraction operation.

【0016】[0016]

【発明の効果】本発明によれば、次の効果〜を奏す
る(図1参照)。 燃料噴射ポンプ5のフランジ部6からカム部10の基
礎円部分17までの離隔寸法20に誤差があっても、ス
リーブ8の燃料通過口12と下死点におけるプランジャ
9の頂面19の相対位置は常に一定し、プランジャ9の
プレストローク18に狂いが生じる余地はない。このた
め、プレストローク18の狂いに起因する噴射開始時期
の狂いが防止される。
According to the present invention, the following effects (1) to (3) are exhibited. Even if there is an error in the separation distance 20 from the flange portion 6 of the fuel injection pump 5 to the base circular portion 17 of the cam portion 10, the relative position of the fuel passage opening 12 of the sleeve 8 and the top surface 19 of the plunger 9 at the bottom dead center. Is always constant, and there is no room for deviation in the prestroke 18 of the plunger 9. Therefore, the deviation of the injection start timing due to the deviation of the prestroke 18 is prevented.

【0017】自動伸縮機構16は自動的に伸縮作動す
るため、人為的な修正作業は不要になる。
Since the automatic expansion / contraction mechanism 16 automatically expands / contracts, no manual correction work is required.

【0018】複数の修正用シムが不要になり、部品管
理が簡単になる。
Since a plurality of correction shims are unnecessary, parts management is simplified.

【0019】カム部10によるリフト中、自動伸縮機
構16は不要に伸縮しないため、自動伸縮機構16によ
って噴射状態が狂うことはない。
Since the automatic expansion and contraction mechanism 16 does not expand and contract unnecessarily during the lift by the cam portion 10, the automatic expansion and contraction mechanism 16 does not disturb the injection state.

【0020】[0020]

【実施例】本発明の実施例を図面に基づいて説明する。
図1及び図2は本発明の実施例を説明する図である。こ
の実施例では2気筒縦形ディーゼルエンジンの燃料噴射
装置が用いられており、その構造は次の通りである。す
なわち、図2に示すように、シリンダブロック23の横
側にポンプ収容ケース1が形成され、ホンプ収容ケース
1内に噴射ポンプカム軸2が架設されている。
An embodiment of the present invention will be described with reference to the drawings.
1 and 2 are diagrams for explaining an embodiment of the present invention. In this embodiment, a fuel injection device for a 2-cylinder vertical diesel engine is used, and its structure is as follows. That is, as shown in FIG. 2, the pump housing case 1 is formed on the lateral side of the cylinder block 23, and the injection pump cam shaft 2 is installed in the hoop housing case 1.

【0021】ポンプ収容ケース1の上側のケース壁3に
はポンプ差し込み口4が開口され、このポンプ差し込み
口4からポンプ収容ケース1内に燃料噴射ポンプ5が差
し込まれている。そして、燃料噴射ポンプ5のフランジ
部6がポンプ差し込み口4の開口周縁部7に着座されて
組み付けられている。
A pump insertion port 4 is opened in an upper case wall 3 of the pump housing case 1, and a fuel injection pump 5 is inserted into the pump housing case 1 through the pump insertion port 4. Then, the flange portion 6 of the fuel injection pump 5 is seated and assembled to the opening peripheral edge portion 7 of the pump insertion port 4.

【0022】ポンプ収容ケース1の前側にはギヤケース
24が取り付けられ、このギヤケース24はシリンダブ
ロック23の前側も覆っている。このギヤケース24内
にはメカニカルガバナ25が配置されており、ガバナウ
ェイト26の遠心力に基づいて発生するガバナ力27と
ガバナスプリング28のスプリング力29との不釣り合
い力でガバナレバー30を揺動させ、燃料噴射ポンプ5
の燃料調量ラック31を調量移動させ、エンジンにかか
る負荷の変動に拘わらずエンジンの回転速度を一定に維
持するようになっている。
A gear case 24 is attached to the front side of the pump housing case 1, and the gear case 24 also covers the front side of the cylinder block 23. A mechanical governor 25 is arranged in the gear case 24, and the governor lever 30 is swung by an unbalanced force between the governor force 27 generated based on the centrifugal force of the governor weight 26 and the spring force 29 of the governor spring 28. Fuel injection pump 5
The fuel metering rack 31 is controlled to move so as to maintain the engine rotation speed constant regardless of the change in the load applied to the engine.

【0023】燃料噴射ポンプ5の構造は次の通りであ
る。すなわち、図1に示すように、燃料噴射ポンプ5の
ポンプボディ32の高さ方向中央部にはスリーブ8が内
嵌されている。スリーブ8にはプランジャ9が内嵌され
ている。ポンプボディ32の下部にはタペット11が内
嵌され、噴射ポンプカム軸2のカム部10からタペット
11を介してプランジャ9が昇降駆動されるようになっ
ている。
The structure of the fuel injection pump 5 is as follows. That is, as shown in FIG. 1, the sleeve 8 is fitted in the central portion in the height direction of the pump body 32 of the fuel injection pump 5. A plunger 9 is fitted in the sleeve 8. The tappet 11 is fitted in the lower portion of the pump body 32, and the plunger 9 is driven up and down from the cam portion 10 of the injection pump camshaft 2 via the tappet 11.

【0024】また、スリーブ8の周囲には燃料室33が
設けられ、この燃料室33は燃料供給経路34を介して
燃料供給ポンプ(図外)に連通している。スリーブ8の
周側壁には燃料室33に臨む燃料通過口12が開口さ
れ、プランジャ9の周側面には燃料噴射量を調節する斜
溝13が形成されている。また、ポンプボディ32の上
部にはデリバリーバルブ35が設けられている。
A fuel chamber 33 is provided around the sleeve 8, and the fuel chamber 33 communicates with a fuel supply pump (not shown) via a fuel supply passage 34. A fuel passage port 12 facing the fuel chamber 33 is opened on the peripheral side wall of the sleeve 8, and a slant groove 13 for adjusting the fuel injection amount is formed on the peripheral side surface of the plunger 9. Further, a delivery valve 35 is provided above the pump body 32.

【0025】この燃料噴射ポンプ5によれば、噴射ポン
プカム軸2のカム部10のリフトによってプランジャ9
が上昇し、燃料噴射が行われる。すなわち、プランジャ
9が下死点から燃料通過口12を塞ぐまでのプレストロ
ーク18が終了した時点で燃料噴射が開始され、プラン
ジャ9の斜溝13が燃料通過口12と連通した時点で燃
料噴射が終了する。プランジャ9のプレストローク18
は、下死点におけるプランジャ9の頂面19とスリーブ
8の燃料通過口12との相対位置によって定まる。
According to this fuel injection pump 5, the plunger 9 is lifted by the lift of the cam portion 10 of the injection pump cam shaft 2.
Rises and fuel is injected. That is, the fuel injection is started at the time when the prestroke 18 from the bottom dead center of the plunger 9 until the fuel passage port 12 is closed, and the fuel injection is started at the time when the slanted groove 13 of the plunger 9 communicates with the fuel passage port 12. finish. Prestroke 18 of plunger 9
Is determined by the relative position of the top surface 19 of the plunger 9 and the fuel passage opening 12 of the sleeve 8 at the bottom dead center.

【0026】この実施例では、燃料噴射ポンプ5の噴射
開始時期の狂いを防止できるようにするため、次のよう
な構成が採用されている。すなわち、燃料噴射ポンプ5
内にストッパ部14が設けられ、プランジャ9に係合部
15が設けられ、ストッパ部14に係合部15が受け止
められることに基づいて、プランジャ9の下降が停止さ
れるように構成されている。そして、プランジャ9とタ
ペット11との間に自動伸縮機構16が介在され、係合
部15をストッパ部14に受け止めさせたまま、タペッ
ト11がカム部10の基礎円部分17に密着するよう
に、自動伸縮機構16が伸縮作動し、自動伸縮機構16
が伸縮作動後の状態を維持したままカム部10でリフト
されるようなっている。
In this embodiment, in order to prevent deviation of the injection start timing of the fuel injection pump 5, the following constitution is adopted. That is, the fuel injection pump 5
The stopper portion 14 is provided therein, the plunger 9 is provided with the engaging portion 15, and the lowering of the plunger 9 is stopped based on the stopper portion 14 receiving the engaging portion 15. . Then, the automatic expansion and contraction mechanism 16 is interposed between the plunger 9 and the tappet 11, and the tappet 11 is brought into close contact with the basic circular portion 17 of the cam portion 10 while the engaging portion 15 is being received by the stopper portion 14. The automatic expansion and contraction mechanism 16 operates to expand and contract,
Is lifted by the cam portion 10 while maintaining the state after the expansion and contraction operation.

【0027】このような構成によれば、燃料噴射ポンプ
5のフランジ部6からカム部10の基礎円部分17まで
の離隔寸法20に誤差があっても、スリーブ8の燃料通
過口12と下死点におけるプランジャ9の頂面19の相
対位置は常に一定し、プランジャ9のプレストローク1
8に狂いが生じる余地はない。このため、プレストロー
ク18の狂いに起因する噴射開始時期の狂いが防止され
る。この実施例のエンジンは二気筒であるため、スリー
ブ8・プランジャ9・カム部10の組み合わせが二組あ
り、この組み合わせ毎に離隔寸法20が異なる場合があ
るが、このような場合、各組み合わせ毎の誤差修正が可
能である。修正用シムを用いる従来のものでは、各組み
合わせ毎の誤差修正は不可能である。
According to this structure, even if there is an error in the distance 20 from the flange portion 6 of the fuel injection pump 5 to the basic circular portion 17 of the cam portion 10, the fuel passage port 12 of the sleeve 8 and the bottom dead center are dead. The relative position of the top surface 19 of the plunger 9 at the point is always constant and the prestroke 1 of the plunger 9
There is no room for 8 to go mad. Therefore, the deviation of the injection start timing due to the deviation of the prestroke 18 is prevented. Since the engine of this embodiment has two cylinders, there are two combinations of the sleeve 8, the plunger 9, and the cam portion 10, and the separation dimension 20 may be different for each combination. In such a case, each combination is different. It is possible to correct the error. The conventional method using the correction shim cannot correct the error for each combination.

【0028】上記構成をより具体的に説明すると次の通
りである。すなわち、ストッパ部14はポンプボディ3
2の内周に形成した水平な段付部分により形成され、係
合部15はプランジャ9の下端部に外嵌固定したスプリ
ング受けで形成されている。このスプリング受けはプラ
ンジャ9を下降させるためのプランジャバネ37の一端
を受けるためのものである。
The above configuration will be described more specifically as follows. That is, the stopper portion 14 is the pump body 3
The engaging portion 15 is formed by a horizontal stepped portion formed on the inner periphery of the second member 2, and the engaging portion 15 is formed by a spring receiver externally fitted and fixed to the lower end portion of the plunger 9. This spring receiver is for receiving one end of a plunger spring 37 for lowering the plunger 9.

【0029】また、自動伸縮機構16は、油圧式ラッシ
ュアジャスト機構により形成されており、その構成は次
の通りである。すなわち、タペット11の上部に油圧ケ
ース38が付設され、プランジャ9の下端部に油導入ケ
ース39が付設され、油導入ケース39が油圧ケース3
8に摺動自在に内嵌され、油圧ケース38の内底と油導
入ケース39との間にはアジャストバネ40が介設さ
れ、そのバネ圧はプランジャバネ37よりも十分に小さ
くしてある。油導入ケース39は油導入路41を介して
潤滑油圧送路42に連通されている。油圧ケース38と
油導入ケース39は油導入ケース39内底の連通口43
で連通され、連通口43には油圧ケース38側からチェ
ックバルブ44を臨ませてある。
Further, the automatic expansion / contraction mechanism 16 is formed by a hydraulic lash adjusting mechanism, and its structure is as follows. That is, the hydraulic case 38 is attached to the upper part of the tappet 11, the oil introducing case 39 is attached to the lower end of the plunger 9, and the oil introducing case 39 is attached to the hydraulic case 3.
8, an adjusting spring 40 is provided between the inner bottom of the hydraulic case 38 and the oil introducing case 39, and the spring pressure thereof is sufficiently smaller than that of the plunger spring 37. The oil introduction case 39 is communicated with the lubricating hydraulic pressure feed passage 42 via the oil introduction passage 41. The hydraulic case 38 and the oil introduction case 39 are connected to each other through a communication port 43 on the inner bottom of the oil introduction case 39.
The check valve 44 faces the communication port 43 from the hydraulic case 38 side.

【0030】この自動伸縮機構16によれば、タペット
11がカム部10の基礎円部分17に接当している間
は、油圧ケース38がカム部10によってリフトされな
いため、チェックバルブ44は開弁している。このた
め、係合部15をストッパ部14に受け止めさせたま
ま、タペット11がカム部10の基礎円部分17に密着
するように、油圧ケース38と油導入ケース39とが伸
縮作動する。そして、タペット11がカム部10によっ
てリフトされる間は、油圧ケース38の押し上げにより
油圧ケース38の油圧が高まり、チェックバルブ44が
閉弁し、油圧ケース38の油が抜けないので、油圧ケー
ス38と油導入ケース39が伸縮作動後の状態を維持し
たままカム部10でリフトされる。
According to the automatic expanding / contracting mechanism 16, the hydraulic case 38 is not lifted by the cam portion 10 while the tappet 11 is in contact with the base circle portion 17 of the cam portion 10, so that the check valve 44 is opened. are doing. Therefore, the hydraulic case 38 and the oil introduction case 39 expand and contract so that the tappet 11 is in close contact with the base circular portion 17 of the cam portion 10 while the engagement portion 15 is being received by the stopper portion 14. While the tappet 11 is lifted by the cam portion 10, the hydraulic case 38 is pushed up to increase the hydraulic pressure of the hydraulic case 38, the check valve 44 is closed, and the hydraulic case 38 does not drain oil. The oil introduction case 39 is lifted by the cam portion 10 while maintaining the state after the expansion and contraction operation.

【0031】本発明の実施例の内容は上記の通りである
が、本発明は上記実施例の内容に限定されるものではな
い。例えば、上記実施例は二気筒縦形エンジンで説明し
たが、この発明は、単気筒、3気筒以上の多気筒、横形
等の各種形式のエンジンにも用いることができる。特
に、多気筒エンジンに用いた場合には、スリーブ8・プ
ランジャ9・カム部10の組み合わせが気筒数と同数あ
り、各組み合わせ毎の誤差修正が可能となるため、その
利点が大きい。
The contents of the embodiment of the present invention are as described above, but the present invention is not limited to the contents of the above embodiment. For example, although the above-described embodiments have been described with respect to a two-cylinder vertical engine, the present invention can be applied to various types of engines such as a single cylinder, a multi-cylinder having three or more cylinders, and a horizontal type. In particular, when used in a multi-cylinder engine, the number of combinations of the sleeve 8, the plunger 9, and the cam portion 10 is the same as the number of cylinders, and the error can be corrected for each combination, which is a great advantage.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例に係るディーゼルエンジンの燃料噴射装
置の要部を説明する図で、図1(A)は縦断面図、図1
(B)は図1(A)のB矢視部の拡大図、図1(C)は
図1(A)のC矢視部の拡大図である。
FIG. 1 is a diagram illustrating a main part of a fuel injection device for a diesel engine according to an embodiment, FIG. 1 (A) is a vertical cross-sectional view, and FIG.
1B is an enlarged view of an arrow B portion of FIG. 1A, and FIG. 1C is an enlarged view of an arrow C portion of FIG.

【図2】実施例に係るディーゼルエンジンの燃料噴射装
置の縦断面図である。
FIG. 2 is a vertical cross-sectional view of a fuel injection device for a diesel engine according to an embodiment.

【図3】従来技術に係るディーゼルエンジンの燃料噴射
装置の要部を説明する図で、図3(A)は縦断面図、図
3(B)は図3(A)のB矢視部の拡大図である。
3A and 3B are views for explaining a main part of a fuel injection device for a diesel engine according to a conventional technique. FIG. 3A is a vertical cross-sectional view, and FIG. 3B is a view of an arrow B in FIG. 3A. FIG.

【符号の説明】[Explanation of symbols]

1…ポンプ収容ケース、2…噴射ポンプカム軸、3…ケ
ース壁、4…ポンプ差し込み口、5…燃料噴射ポンプ、
6…フランジ部、7…開口周縁部、8…スリーブ、9…
プランジャ、10…カム部、11…タペット、12…燃
料通過口、13…斜溝、14…ストッパ部、15…係合
部、16…自動伸縮機構、17…基礎円部分。
1 ... Pump housing case, 2 ... Injection pump cam shaft, 3 ... Case wall, 4 ... Pump insertion port, 5 ... Fuel injection pump,
6 ... Flange portion, 7 ... Opening peripheral edge portion, 8 ... Sleeve, 9 ...
Plunger, 10 ... Cam part, 11 ... Tappet, 12 ... Fuel passage port, 13 ... Oblique groove, 14 ... Stopper part, 15 ... Engagement part, 16 ... Automatic expansion / contraction mechanism, 17 ... Basic circle part.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ホンプ収容ケース(1)内に噴射ポンプカ
ム軸(2)を架設し、ポンプ収容ケース(1)のケース壁
(3)にポンプ差し込み口(4)をあけ、このポンプ差し込
み口(4)からポンプ収容ケース(1)内に燃料噴射ポンプ
(5)を差し込み、燃料噴射ポンプ(5)のフランジ部(6)
をポンプ差し込み口(4)の開口周縁部(7)に着座させて
組み付け、燃料噴射ポンプ(5)にスリーブ(8)を内設
し、スリーブ(8)にプランジャ(9)を内嵌し、噴射ポン
プカム軸(2)のカム部(10)からタペット(11)を介し
てプランジャ(9)を昇降駆動できるように構成し、スリ
ーブ(8)の周側壁に燃料通過口(12)をあけ、プランジ
ャ(9)の周側面に燃料噴射量を調節する斜溝(13)を形
成して構成した、ディーゼルエンジンの燃料噴射装置に
おいて、 燃料噴射ポンプ(5)内にストッパ部(14)を設け、プラ
ンジャ(9)に係合部(15)を設け、ストッパ部(14)に
係合部(15)が受け止められることに基づいて、プラン
ジャ(9)の下降が停止されるように構成し、プランジャ
(9)とタペット(11)との間に自動伸縮機構(16)を介
在させ、係合部(15)をストッパ部(14)に受け止めさ
せたまま、タペット(11)をカム部(10)の基礎円部分
(17)に密着させるように、自動伸縮機構(16)が伸縮
作動し、自動伸縮機構(16)が伸縮作動後の状態を維持
したままカム部(10)でリフトされるように構成した、
ことを特徴とするディーゼルエンジンの燃料噴射装置。
1. An injection pump cam shaft (2) is installed inside a hoop housing case (1), and a case wall of the pump housing case (1).
The pump insertion port (4) is opened in (3), and the fuel injection pump is inserted into the pump housing case (1) from this pump insertion port (4).
Insert (5), the flange part (6) of the fuel injection pump (5)
Is seated on the opening peripheral portion (7) of the pump insertion port (4) and assembled, the sleeve (8) is installed inside the fuel injection pump (5), and the plunger (9) is fitted inside the sleeve (8). The injection pump cam shaft (2) is configured so that the plunger (9) can be driven up and down from the cam portion (10) via the tappet (11), and the fuel passage port (12) is opened in the peripheral side wall of the sleeve (8). In a fuel injection device of a diesel engine, which is configured by forming a slant groove (13) for adjusting a fuel injection amount on a peripheral side surface of a plunger (9), a stopper portion (14) is provided in a fuel injection pump (5), The plunger (9) is provided with an engaging portion (15), and the stopper (14) receives the engaging portion (15) so that the lowering of the plunger (9) is stopped.
An automatic expansion / contraction mechanism (16) is interposed between the tappet (11) and the tappet (11), and the tappet (11) is retained by the stopper (14) while the engagement portion (15) is received by the cam (10). Basic circle part
The automatic expansion and contraction mechanism (16) is expanded and contracted so as to be in close contact with (17), and the automatic expansion and contraction mechanism (16) is lifted by the cam portion (10) while maintaining the state after the expansion and contraction operation,
A fuel injection device for a diesel engine, which is characterized in that
JP6153340A 1994-07-05 1994-07-05 Diesel engine fuel injection system Expired - Fee Related JP2952746B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6153340A JP2952746B2 (en) 1994-07-05 1994-07-05 Diesel engine fuel injection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6153340A JP2952746B2 (en) 1994-07-05 1994-07-05 Diesel engine fuel injection system

Publications (2)

Publication Number Publication Date
JPH0821334A true JPH0821334A (en) 1996-01-23
JP2952746B2 JP2952746B2 (en) 1999-09-27

Family

ID=15560339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6153340A Expired - Fee Related JP2952746B2 (en) 1994-07-05 1994-07-05 Diesel engine fuel injection system

Country Status (1)

Country Link
JP (1) JP2952746B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104755744A (en) * 2011-09-30 2015-07-01 瓦锡兰芬兰有限公司 Fuel injection pump arrangement and method for operating an internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104755744A (en) * 2011-09-30 2015-07-01 瓦锡兰芬兰有限公司 Fuel injection pump arrangement and method for operating an internal combustion engine

Also Published As

Publication number Publication date
JP2952746B2 (en) 1999-09-27

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