JPH06346822A - Fuel injection timing adjusting device for diesel engine - Google Patents

Fuel injection timing adjusting device for diesel engine

Info

Publication number
JPH06346822A
JPH06346822A JP5160191A JP16019193A JPH06346822A JP H06346822 A JPH06346822 A JP H06346822A JP 5160191 A JP5160191 A JP 5160191A JP 16019193 A JP16019193 A JP 16019193A JP H06346822 A JPH06346822 A JP H06346822A
Authority
JP
Japan
Prior art keywords
fuel injection
intermediate member
cam gear
diesel engine
cam
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.)
Pending
Application number
JP5160191A
Other languages
Japanese (ja)
Inventor
Shinji Sasaki
真治 佐々木
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 JP5160191A priority Critical patent/JPH06346822A/en
Publication of JPH06346822A publication Critical patent/JPH06346822A/en
Pending 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

  • High-Pressure Fuel Injection Pump Control (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

(57)【要約】 【目的】 ディーゼルエンジンの燃料噴射ポンプのプレ
ストロークを一定にしたままで噴射時期を調節できるよ
うにする。 【構成】 燃料噴射ポンプ5を駆動する燃料噴射カム軸
11と燃料噴射カムギア12との間に中間部材18を設
ける。その中間部材18に上記カムギア12を軸心回り
に回動自在に支持し、そのカムギア12を連結ボルト1
9によって上記の中間部材18に回動不能に固定する。
上記の中間部材18を固定用ナット27によって上記カ
ム軸11に固定する。噴射時期の調節時には、上記ボル
ト19(及びナット27)を緩めて、上記の中間部材1
8に対して上記カムギア12を所定の角度だけ回動させ
る。その後、上記ボルト19(及びナット27)を締め
付けて、上記カムギア12を中間部材18に固定する。
これにより、上記カム軸11と上記カムギア12との位
相を変更できる。
(57) [Summary] [Purpose] To make it possible to adjust the injection timing while keeping the prestroke of the fuel injection pump of the diesel engine constant. An intermediate member 18 is provided between a fuel injection cam shaft 11 that drives a fuel injection pump 5 and a fuel injection cam gear 12. The intermediate member 18 supports the cam gear 12 so that the cam gear 12 is rotatable about its axis, and the cam gear 12 is supported by the connecting bolt 1.
It is non-rotatably fixed to the intermediate member 18 by 9.
The intermediate member 18 is fixed to the cam shaft 11 with a fixing nut 27. At the time of adjusting the injection timing, the bolt 19 (and the nut 27) is loosened, and the intermediate member 1
The cam gear 12 is rotated with respect to 8 by a predetermined angle. Then, the bolt 19 (and the nut 27) is tightened to fix the cam gear 12 to the intermediate member 18.
Thereby, the phases of the cam shaft 11 and the cam gear 12 can be changed.

Description

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

【0001】[0001]

【産業上の利用分野】この発明は、ディーゼルエンジン
の燃料噴射時期を機械的に調節する装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mechanically adjusting the fuel injection timing of a diesel engine.

【0002】[0002]

【従来の技術】従来の小型ディーゼルエンジンには、燃
料噴射ポンプをフランジ取付け式に構成し、その取付け
フランジをシリンダブロックのポンプ取付け座に固定
し、燃料噴射ポンプの噴射時期を調節する時には、上記
の取付け座と上記フランジとの間に装着するシムの厚さ
を変更するように構成したものがある。
2. Description of the Related Art In a conventional small diesel engine, a fuel injection pump is constructed in a flange mounting type, the mounting flange is fixed to a pump mounting seat of a cylinder block, and when adjusting the injection timing of the fuel injection pump, There is a configuration in which the thickness of the shim mounted between the mounting seat and the flange is changed.

【0003】[0003]

【発明が解決しようとする課題】上記の従来技術では、
同上のシムの厚さを変更すると、燃料噴射ポンプのシリ
ンダバレルの燃料給排孔とプランジャの上端面との高さ
寸法が変わってしまうため、プレストロークも変化す
る。その結果、上記プランジャの有効ストロークが変化
してディーゼルエンジンの燃焼条件がかえって悪化する
おそれがあった。本発明は、プレストロークを一定にし
たまま燃料噴射時期を調節できるようにすることを目的
とする。
SUMMARY OF THE INVENTION In the above prior art,
If the thickness of the above-mentioned shim is changed, the height dimension between the fuel supply / discharge hole of the cylinder barrel of the fuel injection pump and the upper end surface of the plunger is changed, so that the prestroke is also changed. As a result, the effective stroke of the plunger may change and the combustion conditions of the diesel engine may worsen. An object of the present invention is to make it possible to adjust the fuel injection timing while keeping the prestroke constant.

【0004】[0004]

【課題を解決するための手段】本発明は、上記目的を達
成するために、ディーゼルエンジンの燃料噴射時期調節
装置を、例えば、図1と図2・又は図3に示すように、
次のように構成した。
In order to achieve the above object, the present invention provides a fuel injection timing adjusting device for a diesel engine, for example, as shown in FIG. 1 and FIG. 2 or FIG.
I configured it as follows:

【0005】ディーゼルエンジンのシリンダブロック1
のポンプ取り付け座3に燃料噴射ポンプ5の取り付けフ
ランジ6を固定し、上記の燃料噴射ポンプ5を駆動する
燃料噴射カム軸11に燃料噴射カムギア12を連動連結
したディーゼルエンジンにおいて、上記カム軸11と上
記カムギア12との間に中間部材18を設け、その中間
部材18に上記カムギア12を軸心回りに回動自在に支
持し、そのカムギア12を上記の中間部材18に回動不
能に連結する連結具19を設けるとともに、上記の中間
部材18を上記カム軸11に固定する固定具27を設け
たものである。
Cylinder block 1 of diesel engine
In the diesel engine in which the mounting flange 6 of the fuel injection pump 5 is fixed to the pump mounting seat 3 of the above, and the fuel injection cam shaft 11 for driving the above fuel injection pump 5 is interlockingly connected to the fuel injection cam gear 12. An intermediate member 18 is provided between the cam gear 12 and the cam gear 12, and the cam gear 12 is rotatably supported by the intermediate member 18 about an axis thereof. The cam gear 12 is non-rotatably connected to the intermediate member 18. In addition to providing the tool 19, a fixing tool 27 for fixing the intermediate member 18 to the cam shaft 11 is provided.

【0006】[0006]

【作用】本発明は、例えば図1と図2に示すように、デ
ィーゼルエンジンの燃料噴射時期が次のように調節され
る。まず、燃料噴射ポンプ5の取り付けフランジ6とポ
ンプ取り付け座3との間に設けたシム8の厚さを調節し
て、その燃料噴射ポンプ5のプレストロークを所望の値
に設定する。次に、燃料噴射カム軸11を燃料噴射開始
時点の位置で回転ロックする。引き続いて、連結具19
の連結状態を解除し、上記カムギア12に噛合するクラ
ンクギア13等を、目標とする噴射開始時期の回動位置
に回動させる。すると、上記カム軸11及び上記の中間
部材18に対して上記カムギア12が所定の角度だけ回
動される。最後に、前記の連結ボルト19を締め付け
て、上記カムギア12を中間部材18に固定する。
In the present invention, the fuel injection timing of the diesel engine is adjusted as follows, as shown in FIGS. 1 and 2, for example. First, the thickness of the shim 8 provided between the mounting flange 6 of the fuel injection pump 5 and the pump mounting seat 3 is adjusted to set the prestroke of the fuel injection pump 5 to a desired value. Next, the fuel injection cam shaft 11 is rotationally locked at the position at the time of starting fuel injection. Subsequently, the connector 19
And the crank gear 13 and the like meshing with the cam gear 12 are rotated to the target rotation position at the injection start timing. Then, the cam gear 12 is rotated by a predetermined angle with respect to the cam shaft 11 and the intermediate member 18. Finally, the connecting bolt 19 is tightened to fix the cam gear 12 to the intermediate member 18.

【0007】[0007]

【発明の効果】本発明によれば、ディーゼルエンジンの
燃料噴射時期の調節は、燃料噴射カムギアを中間部材に
対して回動させて、燃料噴射カム軸とカムギアとの位相
を変化させることによって達成される。このため、燃料
噴射ポンプの取り付けフランジの取り付け高さを調節す
る必要がなくなって、プレストロークを初期の値に保て
る。
According to the present invention, the adjustment of the fuel injection timing of the diesel engine is achieved by rotating the fuel injection cam gear with respect to the intermediate member and changing the phase between the fuel injection cam shaft and the cam gear. To be done. Therefore, it is not necessary to adjust the mounting height of the mounting flange of the fuel injection pump, and the prestroke can be maintained at the initial value.

【0008】[0008]

【実施例】以下、本発明の一実施例を図1と図2で説明
する。図1(A)は、ディーゼルエンジンの燃料噴射ポン
プの駆動機構の縦断面図で、図1(B)は、上記の図1
(A)のB−B線矢視図である。図2は、上記の図1(B)
の拡大模式図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1A is a vertical cross-sectional view of a drive mechanism of a fuel injection pump of a diesel engine, and FIG.
It is a BB line arrow view of (A). FIG. 2 shows the above-mentioned FIG. 1 (B).
FIG.

【0009】ディーゼルエンジンのシリンダブロック1
に、ポンプ挿入孔2とポンプ取り付け座3とが設けられ
る。そのポンプ取り付け座3に燃料噴射ポンプ5の取り
付けフランジ6が複数のボルト7によって固定される。
上記の取り付け座3と上記フランジ6との間には、高さ
調節用のシム8が挿入されている。上記ポンプ5の下側
に燃料噴射カム軸11が回転自在に支持され、そのカム
軸11が燃料噴射カムギア12を介してクランクギア1
3に連動連結される。符号14は燃料噴射カムで、符号
15はギアケースである。
Cylinder block 1 of diesel engine
A pump insertion hole 2 and a pump mounting seat 3 are provided in the. A mounting flange 6 of the fuel injection pump 5 is fixed to the pump mounting seat 3 by a plurality of bolts 7.
A shim 8 for height adjustment is inserted between the mounting seat 3 and the flange 6. A fuel injection cam shaft 11 is rotatably supported on the lower side of the pump 5, and the cam shaft 11 is connected to a crank gear 1 via a fuel injection cam gear 12.
3 is linked and linked. Reference numeral 14 is a fuel injection cam, and reference numeral 15 is a gear case.

【0010】上記カム軸11と上記カムギア12との間
に、リング状の中間部材18が設けられる。その中間部
材18に上記カムギア12が軸心回りに回動自在に支持
される。そのカムギア12が連結ボルト19によって上
記の中間部材18に回動不能に連結される。この連結ボ
ルト19は、上記カムギア12の周孔21に挿入され
て、上記の中間部材18のネジ孔22にネジ止めされ
る。上記の周孔21の周方向の長さは、中間部材18の
連結ボルト19に対してカムギア12が15度から30
度に回動できるように設定されている。
A ring-shaped intermediate member 18 is provided between the cam shaft 11 and the cam gear 12. The cam gear 12 is supported by the intermediate member 18 so as to be rotatable about its axis. The cam gear 12 is non-rotatably connected to the intermediate member 18 by a connecting bolt 19. The connecting bolt 19 is inserted into the peripheral hole 21 of the cam gear 12 and screwed into the screw hole 22 of the intermediate member 18. The circumferential length of the circumferential hole 21 is such that the cam gear 12 is 15 degrees to 30 degrees with respect to the connecting bolt 19 of the intermediate member 18.
It is set to rotate every time.

【0011】上記カムギア12には、複数のピン孔24
が周方向へ2度の角度をあけて設けられる。また、上記
の中間部材18には、複数のピン孔25が周方向へ1.5
度の角度をあけて設けられる。これらピン孔24・25
に位置決めピン26が挿入される。前記カム軸11の右
端部に、上記の中間部材18が固定用ナット27と上記
カムギア12とによって固定される。符号はキー28で
ある。
The cam gear 12 has a plurality of pin holes 24.
Are provided at an angle of 2 degrees in the circumferential direction. Further, the intermediate member 18 has a plurality of pin holes 25 in the circumferential direction.
It is provided with an angle of degrees. These pin holes 24 and 25
The positioning pin 26 is inserted into the. The intermediate member 18 is fixed to the right end of the cam shaft 11 by a fixing nut 27 and the cam gear 12. The reference numeral is the key 28.

【0012】上記ディーゼルエンジンでは、燃料噴射時
期が次のように調節される。まず、前記シム8の厚さを
調節して燃料噴射ポンプ5の各ポンプエレメントのプレ
ストロークを所望の値に設定する。次に、前記の固定用
ナット27を緩めるとともに前記の連結ボルト19を緩
めて、予め決定しておいた2つのピン孔24・25にわ
たって仮止めピン(図示せず)を挿入する。この状態で、
燃料噴射ポンプ5の各ポンプエレメントの噴射開始時点
を測定し、その噴射開始時点の位置で燃料噴射カム軸1
1を回転ロックする。
In the above diesel engine, the fuel injection timing is adjusted as follows. First, the thickness of the shim 8 is adjusted to set the prestroke of each pump element of the fuel injection pump 5 to a desired value. Next, the fixing nut 27 is loosened and the connecting bolt 19 is loosened, and a temporary fixing pin (not shown) is inserted over the two predetermined pin holes 24 and 25. In this state,
The injection start time of each pump element of the fuel injection pump 5 is measured, and at the position of the injection start time, the fuel injection camshaft 1
1 is rotation locked.

【0013】その後、上記の仮止めピンを取り外し、前
記クランクギア13を目標とする噴射時期へ回動させ
る。すると、上記の中間部材18に対して上記カムギア
12が所定の角度だけ回動される。その回動位置で、2
つのピン孔24・25にわたって位置決めピン26を打
ち込む。最後に、前記の連結ボルト19を締め付けると
ともに前記の固定用ナット27を締め付ける。上記カム
ギア12に2度の角度ごとにピン孔24を設けるととも
に中間部材18に1.5度の角度ごとにピン孔25を設け
たので、上記カムギア12の回動角度を0.5度ごとに調
節できる。
After that, the temporary fixing pin is removed, and the crank gear 13 is rotated to the target injection timing. Then, the cam gear 12 is rotated with respect to the intermediate member 18 by a predetermined angle. 2 in that pivot position
The positioning pin 26 is driven over the two pin holes 24 and 25. Finally, the connecting bolt 19 is tightened and the fixing nut 27 is tightened. Since the cam gear 12 is provided with the pin holes 24 at every 2 degrees and the intermediate member 18 is provided with the pin holes 25 at every 1.5 degrees, the rotation angle of the cam gear 12 can be adjusted at every 0.5 degrees.

【0014】なお、前記の2つのピン孔24・25と位
置決めピン26とを省略してもよい。この場合の燃料噴
射時期の調節は、固定用ナット27と連結ボルト19と
を緩めた状態で燃料噴射カムギア12を所定の角度だけ
回動させ、その後、上記ナット27とボルト19とを締
付ければよい。
The two pin holes 24 and 25 and the positioning pin 26 may be omitted. In this case, the fuel injection timing can be adjusted by rotating the fuel injection cam gear 12 by a predetermined angle with the fixing nut 27 and the connecting bolt 19 loosened, and then tightening the nut 27 and the bolt 19. Good.

【0015】図3は、変形例を示し、前記の図1(A)の
部分図に相当する図である。この場合、燃料噴射カムギ
ア12と中間部材18とが、カム軸11の軸心方向で前
記の第1実施例とは逆に配置され、その中間部材18の
ボス18aにカムギア12が外嵌される。その他の構成
は前記の第1実施例と同様である。
FIG. 3 shows a modified example, which is equivalent to the partial view of FIG. 1 (A). In this case, the fuel injection cam gear 12 and the intermediate member 18 are arranged in the axial direction of the cam shaft 11 in the opposite direction to the first embodiment, and the cam gear 12 is fitted onto the boss 18a of the intermediate member 18. . The other structure is similar to that of the first embodiment.

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

【図1】(A)図は、ディーゼルエンジンの燃料噴射ポン
プの駆動機構の縦断面図、(B)図は、上記(A)図のB−
B線矢視図である。
FIG. 1 (A) is a vertical cross-sectional view of a drive mechanism of a fuel injection pump of a diesel engine, and FIG. 1 (B) is B- of FIG. 1 (A).
It is a line B arrow line view.

【図2】上記の図1(B)の拡大模式図である。FIG. 2 is an enlarged schematic diagram of FIG. 1 (B) described above.

【図3】変形例を示し、上記の図1(A)の部分図に相当
する図である。
FIG. 3 is a diagram showing a modified example and corresponding to the partial view of FIG.

【符号の説明】[Explanation of symbols]

1…シリンダブロック、3…ポンプ取り付け座、5…燃
料噴射ポンプ、6…取り付けフランジ、11…燃料噴射
カム軸、12…燃料噴射カムギア、18…中間部材、1
9…連結具(連結ボルト)、27…固定具(固定用ナッ
ト)。
DESCRIPTION OF SYMBOLS 1 ... Cylinder block, 3 ... Pump mounting seat, 5 ... Fuel injection pump, 6 ... Mounting flange, 11 ... Fuel injection cam shaft, 12 ... Fuel injection cam gear, 18 ... Intermediate member, 1
9 ... Connecting tool (connecting bolt), 27 ... Fixing tool (fixing nut).

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ディーゼルエンジンのシリンダブロック
(1)のポンプ取り付け座(3)に燃料噴射ポンプ(5)の取
り付けフランジ(6)を固定し、上記の燃料噴射ポンプ
(5)を駆動する燃料噴射カム軸(11)に燃料噴射カムギ
ア(12)を連動連結したディーゼルエンジンにおいて、 上記カム軸(11)と上記カムギア(12)との間に中間部
材(18)を設けて、その中間部材(18)に上記カムギア
(12)を軸心回りに回動自在に支持し、そのカムギア
(12)を上記の中間部材(18)に回動不能に連結する連
結具(19)を設けるとともに、上記の中間部材(18)を
上記カム軸(11)に固定する固定具(27)を設けた、こ
とを特徴とするディーゼルエンジンの燃料噴射時期調節
装置。
1. A cylinder block for a diesel engine.
By fixing the mounting flange (6) of the fuel injection pump (5) to the pump mounting seat (3) of (1),
In a diesel engine in which a fuel injection cam shaft (11) for driving (5) is linked with a fuel injection cam gear (12), an intermediate member (18) is provided between the cam shaft (11) and the cam gear (12). The cam gear is provided on the intermediate member (18).
(12) is rotatably supported about its axis, and its cam gear
A connecting tool (19) for non-rotatably connecting the (12) to the intermediate member (18) is provided, and a fixing tool (27) for fixing the intermediate member (18) to the cam shaft (11) is provided. A fuel injection timing adjusting device for a diesel engine, which is provided.
JP5160191A 1993-06-04 1993-06-04 Fuel injection timing adjusting device for diesel engine Pending JPH06346822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5160191A JPH06346822A (en) 1993-06-04 1993-06-04 Fuel injection timing adjusting device for diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5160191A JPH06346822A (en) 1993-06-04 1993-06-04 Fuel injection timing adjusting device for diesel engine

Publications (1)

Publication Number Publication Date
JPH06346822A true JPH06346822A (en) 1994-12-20

Family

ID=15709789

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5160191A Pending JPH06346822A (en) 1993-06-04 1993-06-04 Fuel injection timing adjusting device for diesel engine

Country Status (1)

Country Link
JP (1) JPH06346822A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6612820B1 (en) 1999-01-11 2003-09-02 David Garrett Staat Screw compressor having sealed low and high pressure bearing chambers
WO2004059148A1 (en) * 2002-12-26 2004-07-15 Yanmar Co., Ltd. Hydraulic timer unit and fuel injection pump with the same
KR20160098075A (en) * 2015-02-10 2016-08-18 대동공업주식회사 Diesel Engine Assembly Having Setting Means for Injection Pump Timing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6612820B1 (en) 1999-01-11 2003-09-02 David Garrett Staat Screw compressor having sealed low and high pressure bearing chambers
WO2004059148A1 (en) * 2002-12-26 2004-07-15 Yanmar Co., Ltd. Hydraulic timer unit and fuel injection pump with the same
KR20160098075A (en) * 2015-02-10 2016-08-18 대동공업주식회사 Diesel Engine Assembly Having Setting Means for Injection Pump Timing

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