JPH0379546B2 - - Google Patents
Info
- Publication number
- JPH0379546B2 JPH0379546B2 JP5552485A JP5552485A JPH0379546B2 JP H0379546 B2 JPH0379546 B2 JP H0379546B2 JP 5552485 A JP5552485 A JP 5552485A JP 5552485 A JP5552485 A JP 5552485A JP H0379546 B2 JPH0379546 B2 JP H0379546B2
- Authority
- JP
- Japan
- Prior art keywords
- camshaft
- unit injector
- valves
- cylinder
- rocker arm
- 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.)
- Expired
Links
- 239000000446 fuel Substances 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
≪産業上の利用分野≫
この発明は、一つのシリンダに対して吸気弁・
排気弁のうち少なくとも一方を二つ配置し、シリ
ンダヘツドにユニツトインジエクタを配置してな
るデイーゼルエンジンの燃料噴射装置に関する。[Detailed description of the invention] ≪Industrial application field≫ This invention provides an intake valve for one cylinder.
The present invention relates to a fuel injection device for a diesel engine in which at least one of two exhaust valves is disposed and a unit injector is disposed in a cylinder head.
≪従来技術≫
従来、デイーゼルエンジンに装備されるユニツ
トインジエクタは、例えば実開昭59−165966号公
報に示されているように、燃料噴射ノズル部の上
側にポンプ部を同軸配置し、燃料噴射カムの動き
をロツカアームを介してポンプのプランジヤに伝
達して、燃料を燃焼室に噴射するよう構成になつ
ていた。<<Prior art>> Conventionally, a unit injector installed in a diesel engine has a pump part coaxially arranged above a fuel injection nozzle part, as shown in, for example, Japanese Utility Model Application Publication No. 59-165966. The movement of the cam was transmitted via the rocker arm to the plunger of the pump, which injected fuel into the combustion chamber.
≪発明が解決しようとする問題点≫
従来のユニツトインジエクタでは、燃料噴射ノ
ズルのニードルとポンプのプランジヤとが同軸に
配置されていることから、ユニツトインジエクタ
の全高が高くなり、これに伴ないプランジヤ駆動
用のロツカアームをシリンダヘツド上の高い位置
に設けなければならないことから、エンジン全体
としての全高も高くなるという問題がある。<<Problems to be Solved by the Invention>> In conventional unit injectors, the needle of the fuel injection nozzle and the plunger of the pump are arranged coaxially, which increases the overall height of the unit injector. Since the rocker arm for driving the plunger must be provided at a high position above the cylinder head, there is a problem in that the overall height of the engine as a whole also increases.
また、近年エンジンの高出力化を計るために、
一つのシリンダに対して、吸気弁及び／または排
気弁を複数配置したものが提案されているが、こ
のように一つの弁に対してな弁を多数配置したエ
ンジンにユニツトインジエクタを用いた場合に
は、動弁機構の動きを阻害しないようにユニツト
インジエクタ駆動用のロツカアームや該ロツカア
ーム駆動機構を配置しなければならないことか
ら、シリンダヘツド上側での構造が複雑化するう
え、ユニツトインジエクタの駆動用ロツクアーム
枢支部の配設個所が限定されてしまい、アーム長
が長くなるため、該ロツカアームの入力側アーム
長も長くなつてエンジン全幅が広くなるという問
題がある。 In addition, in recent years, in order to increase the output of engines,
It has been proposed that a plurality of intake valves and/or exhaust valves are arranged for one cylinder, but if a unit injector is used in an engine with many valves arranged for one valve in this way, In this case, the rocker arm for driving the unit injector and the rocker arm drive mechanism must be arranged so as not to obstruct the movement of the valve mechanism, which complicates the structure above the cylinder head and makes it difficult to move the unit injector. The location of the drive lock arm pivot is limited and the length of the arm becomes long, which causes the input arm length of the rocker arm to become long, resulting in an increase in the overall width of the engine.
≪問題点を解決するための手段≫
この発明は、上記の問題点を解消しようとする
ものであつて、そのために、一つのシリンダに対
して二つ設けた吸気弁及び／または排気弁をシリ
ンダ軸心よりもカム軸側部分でカム軸の軸心方向
に沿わせて並設し、シリンダヘツドに装着するユ
ニツトインジエクタを、ノズル部の側部にポンプ
部を配置して構成し、このポンプ部のプランジヤ
をシリンダ軸心よりもカム軸側で二つ並ぶ弁同士
間の中間に位置させ、プランジヤをロツカアーム
を介してカム軸の燃料噴射カムに連動連結したこ
とを特徴としている。<<Means for Solving the Problems>> The present invention aims to solve the above problems, and for this purpose, two intake valves and/or exhaust valves are provided for one cylinder. A unit injector is arranged along the axis of the camshaft on the camshaft side of the axis and attached to the cylinder head, and a pump part is arranged on the side of the nozzle part. The plunger of the valve is located midway between the two valves on the camshaft side of the cylinder axis, and the plunger is interlocked and connected to the fuel injection cam of the camshaft via a rocker arm.
≪作用≫
本発明では、ユニツトインジエクタを、ノズル
部の側部にポンプ部を配置することにより構成
し、このポンプ部をシリンダ軸心よりもカム軸側
で二つ並んでいる弁同士間の中間に位置させた状
態でユニツトインジエクタをシリンダヘツドに装
着してあるから、ポンプ部のプランジヤ駆動用ロ
ツカアームをカム軸に沿つて並設されている二つ
の弁同士間に配置することができる。これによ
り、ユニツトインジエクタ駆動機構を簡潔にまと
めることができる。<<Operation>> In the present invention, the unit injector is constructed by arranging the pump part on the side of the nozzle part, and this pump part is arranged between two valves arranged on the camshaft side with respect to the cylinder axis. Since the unit injector is mounted on the cylinder head in an intermediate position, the rocker arm for driving the plunger of the pump section can be located between the two valves arranged in parallel along the camshaft. Thereby, the unit injector drive mechanism can be simply summarized.
≪実施例≫
図面は本発明の一実施例を示し、第１図は要部
の縦断面図、第２図はヘツドカバー部の横断平面
図、第３図はユニツトインジエクタの縦断面図で
ある。<<Embodiment>> The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional view of the main parts, Fig. 2 is a cross-sectional plan view of the head cover section, and Fig. 3 is a longitudinal cross-sectional view of the unit injector. .
図において、１はシリンダブロツク、２はシリ
ンダヘツド、３は排気管、４は吸気管であり、シ
リンダヘツド２には各シリンダ５に対して吸気弁
６と排気弁７とが各々二個づつ配置してある。吸
気弁６と排気弁７はシリンダ軸心を結ぶ線を中心
として左右に振り分けて配置してあり、吸気弁６
列と排気弁７列はそれぞれシリンダ５の側部にそ
れぞれ配置した動弁カム軸８と平行になつてい
る。 In the figure, 1 is a cylinder block, 2 is a cylinder head, 3 is an exhaust pipe, and 4 is an intake pipe. In the cylinder head 2, two intake valves 6 and two exhaust valves 7 are arranged for each cylinder 5. It has been done. The intake valve 6 and the exhaust valve 7 are arranged to the left and right with the line connecting the cylinder axis as the center.
The rows of exhaust valves and the seven rows of exhaust valves are parallel to the valve drive camshafts 8 disposed on the sides of the cylinders 5, respectively.
シリンダヘツド２における各シリンダ軸心位置
にはユニツトインジエクタ９が装着してある。こ
のユニツトインジエクタ９は第３図に示すよう
に、ポンプ部１０をノズル部１１の一側部に配置
してあり、このポンプ部１０をカム軸８の軸心方
向に並んでいる吸気弁６同士間に位置させてあ
る。 A unit injector 9 is mounted at each cylinder axis position in the cylinder head 2. As shown in FIG. 3, this unit injector 9 has a pump section 10 disposed on one side of a nozzle section 11, and this pump section 10 is connected to an intake valve 6 arranged in the axial direction of the camshaft 8. It is located between them.
ポンプ部１０のプランジヤ１２を押圧するロツ
カアーム１３は吸気弁６を開閉作動させるロツカ
アーム１４の枢支軸１５に揺動可能に支持させて
ある。そして、プランジヤ作動用ロツカアーム１
３とシリンダ５の一側配置した吸気弁開閉制御用
動弁カム軸８ａに設けた燃料噴射カム１６とをプ
ツシユロツド１７を介して連動連結してある。 A rocker arm 13 that presses the plunger 12 of the pump section 10 is swingably supported by a pivot shaft 15 of a rocker arm 14 that opens and closes the intake valve 6. And rocker arm 1 for plunger operation
3 and a fuel injection cam 16 provided on a valve operating camshaft 8a for controlling intake valve opening/closing disposed on one side of the cylinder 5 are interlocked and connected via a push rod 17.
第３図中、符号１８はポンプ部１０の燃料流入
路１９に装着したフイルタ、２０は逆止弁２１は
ノズル部１１に装着したニードル弁である。 In FIG. 3, reference numeral 18 is a filter attached to the fuel inflow path 19 of the pump section 10, and reference numeral 20 is a check valve 21, which is a needle valve attached to the nozzle section 11.
なお、上記実施例では、プランジヤ作動用ロツ
カアーム１３を吸気弁用ロツカアーム１４と同軸
に配置したが、これを独立したロツカアーム軸に
枢支させるようにしてもよく、また、ユニツトイ
ンジエクタ９のポンプ部１０を排気弁７同士間の
中間部に位置させ、排気弁作動用ロツカアーム軸
にプランジヤ作動用ロツカアーム１３に枢支させ
るようにしてもよい。また、吸気弁６又は排気弁
７のうちのいずれか一方だけを二つ設け、ユニツ
トインジエクタ９のポンプ部１０を二つ設けた弁
間に位置させるようにしてもよい。 In the above embodiment, the plunger actuating rocker arm 13 is arranged coaxially with the intake valve rocker arm 14, but it may be pivoted to an independent rocker arm shaft. 10 may be located in the middle between the exhaust valves 7, and may be pivoted to the rocker arm 13 for actuating the plunger on the rocker arm shaft for actuating the exhaust valve. Alternatively, only two intake valves 6 or two exhaust valves 7 may be provided, and the pump portion 10 of the unit injector 9 may be located between the two valves.
≪発明の効果≫
本発明では、ノズル部の側部にポンプ部を配置
してユニツトインジエクタを構成しているので、
ユニツトインジエクタの全高を低く形成すること
ができるうえ、このユニツトインジエクタを作動
させるためのロツカアームも低い位置に配設する
ことができるので、エンジンとしての全高を低く
形成することができる。<<Effects of the Invention>> In the present invention, since the pump part is arranged on the side of the nozzle part to constitute a unit injector,
The overall height of the unit injector can be made low, and the rocker arm for operating the unit injector can also be disposed at a low position, so the overall height of the engine can be made low.
また、一つのシリンダに対して吸気弁と排気弁
のうちの少なくとも一方を二個設け、この二個の
弁をカム軸に沿わせて並設し、ユニツトインジエ
クタのポンプ部を並設した二個の弁同士の中間に
位置させているので、ユニツトインジエクタ作動
用のロツカアームの長さも短く形成することがで
き、エンジン横幅も広くすることがない。 In addition, at least one of two intake valves and two exhaust valves are provided for one cylinder, and the two valves are arranged in parallel along the camshaft, and the pump parts of the unit injector are arranged in parallel. Since it is located between the individual valves, the length of the rocker arm for operating the unit injector can be made short, and the width of the engine does not need to be increased.
これにより、エンジン全体を小型化することが
できる。 This allows the entire engine to be downsized.
図面は本発明の一実施例を示し、第１図は要部
の縦断面図、第２図はヘツドカバー部の横断平面
図、第３図はユニツトインジエクタの縦断面図で
ある。
２……シリンダヘツド、５……シリンダ、６…
…吸気弁、７……排気弁、８……カム軸、９……
ユニツトインジエクタ、１０……ポンプ部、１１
……ノズル部、１２……プランジヤ、１３……ロ
ツカアーム、１６……燃料噴射カム。
The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view of the main parts, FIG. 2 is a cross-sectional plan view of the head cover portion, and FIG. 3 is a vertical cross-sectional view of the unit injector. 2...Cylinder head, 5...Cylinder, 6...
...Intake valve, 7...Exhaust valve, 8...Camshaft, 9...
Unit injector, 10... Pump section, 11
... Nozzle part, 12 ... Plunger, 13 ... Locker arm, 16 ... Fuel injection cam.
Claims (1)
７のうち少なくとも一方を二つ設け、シリンダヘ
ツド２のシリンダ軸心の近傍位置にユニツトイン
ジエクタ９を装着してなる頭上弁式のデイーゼル
エンジンにおいて、前記二つ設けた弁をシリンダ
軸心よりもカム軸８側でカム軸８の軸心方向に沿
つて並設し、ユニツトインジエクタ９はノズル部
１１の側部にポンプ部１０を配置して構成し、こ
のポンプ部１０のプランジヤ１２をシリンダ軸心
よりもカム軸側で二つ並ぶ弁同士間の中間に位置
させ、プランジヤ１２をロツカアーム１３を介し
てカム軸８の燃料噴射カム１６に連動連結したこ
とを特徴とするデイーゼルエンジンの燃料噴射装
置。1. An overhead valve type diesel engine in which at least one of an intake valve 6 and an exhaust valve 7 is provided for one cylinder 5, and a unit injector 9 is mounted near the cylinder axis of the cylinder head 2. In this case, the two valves are arranged side by side along the axial direction of the camshaft 8 on the camshaft 8 side with respect to the cylinder axis, and the unit injector 9 has the pump part 10 arranged on the side of the nozzle part 11. The plunger 12 of the pump section 10 is located between two valves arranged on the camshaft side of the cylinder axis, and the plunger 12 is connected to the fuel injection cam 16 of the camshaft 8 via the rocker arm 13. A diesel engine fuel injection device characterized by being interlocked and connected to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5552485A JPS61212660A (en) | 1985-03-18 | 1985-03-18 | Fuel injection device of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5552485A JPS61212660A (en) | 1985-03-18 | 1985-03-18 | Fuel injection device of diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61212660A JPS61212660A (en) | 1986-09-20 |
| JPH0379546B2 true JPH0379546B2 (en) | 1991-12-19 |
Family
ID=13001101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5552485A Granted JPS61212660A (en) | 1985-03-18 | 1985-03-18 | Fuel injection device of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61212660A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6290972U (en) * | 1985-11-26 | 1987-06-10 |
-
1985
- 1985-03-18 JP JP5552485A patent/JPS61212660A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61212660A (en) | 1986-09-20 |
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