JPS6141977Y2 - - Google Patents
Info
- Publication number
- JPS6141977Y2 JPS6141977Y2 JP7698478U JP7698478U JPS6141977Y2 JP S6141977 Y2 JPS6141977 Y2 JP S6141977Y2 JP 7698478 U JP7698478 U JP 7698478U JP 7698478 U JP7698478 U JP 7698478U JP S6141977 Y2 JPS6141977 Y2 JP S6141977Y2
- Authority
- JP
- Japan
- Prior art keywords
- engine
- fuel injection
- timing
- injection pump
- advance
- 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 37
- 238000002347 injection Methods 0.000 claims description 35
- 239000007924 injection Substances 0.000 claims description 35
- 230000007246 mechanism Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Description
【考案の詳細な説明】
本考案は、各気筒に対する燃料の供給を、燃料
噴射ポンプによつて行うようにした燃料噴射式の
エンジンに関するものである。[Detailed Description of the Invention] The present invention relates to a fuel injection type engine in which fuel is supplied to each cylinder by a fuel injection pump.
一般に、この種のエンジンにおいて噴射供給し
た燃料が燃焼を完了するまでには、エンジンの回
転数によつて多少の差があるものの略一定の時間
が必要である。それ故に、この種の燃料噴射エン
ジンにおける燃料噴射ポンプには、例えば実公昭
51−21231号公報に記載されているようにエンジ
ンから当該燃料噴射ポンプへの動力伝達の途中に
遠心式等の噴射時期進角機構を設けて、前記燃料
噴射ポンプによる燃料の噴射時期を、エンジンの
回転数に比例して進角するようにしていることは
周知の通りである。 Generally, in this type of engine, a substantially constant amount of time is required for the injected fuel to complete combustion, although it varies somewhat depending on the engine speed. Therefore, for example, the fuel injection pump in this type of fuel injection engine is
As described in Japanese Patent No. 51-21231, an injection timing advance mechanism such as a centrifugal type is provided in the middle of power transmission from the engine to the fuel injection pump, and the injection timing of the fuel by the fuel injection pump is controlled by the engine. It is well known that the angle is advanced in proportion to the number of revolutions.
しかし、エンジンにおける吸・排気弁をカム軸
によつて開閉する時期は、エンジンの回転数に拘
わらず常に一定であるから、前記のように燃料噴
射ポンプによる燃料の噴射時期のみを進角機構に
てエンジンの回転数に応じて可変することは、エ
ンジンにおける吸・排気弁が開閉する時期と燃料
噴射の時期との位相の関係が刻々変化することに
なつて、両者の最適な位相関係が広い回転域にわ
たつて得られず、従つてエンジンの回転数に対す
る発生トルクは、両者の最適位相関係を呈するよ
うな特定の回転数で最高になり、これ以外の回転
数では発生トルクが急に低下すると言うように、
発生トルク曲線が比較的尖つた形状になるのであ
つた。 However, the timing at which the intake and exhaust valves in the engine are opened and closed by the camshaft is always constant regardless of the engine speed, so as mentioned above, only the timing of fuel injection by the fuel injection pump is controlled by the advance mechanism. The fact that the engine speed varies according to the engine speed means that the phase relationship between the opening/closing timing of the intake/exhaust valves in the engine and the fuel injection timing changes from moment to moment, and the optimal phase relationship between the two is wide. Therefore, the generated torque with respect to the engine speed is highest at a certain speed where the optimum phase relationship between the two is exhibited, and the generated torque suddenly decreases at other speeds. As they say,
The generated torque curve had a relatively sharp shape.
本考案は、この問題を解消することを目的とす
るもので、この目的を達成するために、エンジン
から、当該エンジンに対する燃料噴射ポンプへの
動力伝達部に、前記燃料噴射ポンプによる燃料の
噴射時期をエンジンの回転数に比例して進角する
ようにした進角機構を設けて成る燃料噴射式エン
ジンにおいて、前記エンジンにおける吸・排気弁
を開閉するカム軸に、前記進角機構の出力側から
動力伝達するように構成したものである。 The purpose of the present invention is to solve this problem, and in order to achieve this purpose, the power transmission part from the engine to the fuel injection pump for the engine has a timing control for the injection of fuel by the fuel injection pump. In a fuel injection engine equipped with an advance mechanism that advances the angle in proportion to the engine rotational speed, a camshaft that opens and closes intake and exhaust valves in the engine is provided with a camshaft from the output side of the advance mechanism. It is configured to transmit power.
以下本考案の実施例を図面について説明する
と、図において１は、クランクケース３の下部に
オイルパン４を備えたシリンダブロツク２の上面
に、燃料噴射弁６付きシリンダヘツド５を取付け
て成るエンジンを示し、該エンジン１のシリンダ
ブロツク２におけるクランクケース３内には、タ
ペツト９、押棒１０及び動弁機構（図示せず）を
介してシリンダヘツド５における吸・排気弁（図
示せず）を開閉するためのカム軸８が、前記エン
ジン１におけるクランク軸７と平行に設けられ、
また、前記クランクケース３の外側には、シリン
ダヘツド５における燃料噴射弁６に燃料を供給す
るための燃料噴射ポンプ１１が、シリンダブロツ
ク２に取付く歯車ケース１２を介して設けられて
いる。 Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 shows an engine consisting of a cylinder head 5 with a fuel injection valve 6 attached to the upper surface of a cylinder block 2 which is provided with an oil pan 4 at the bottom of a crankcase 3. In the crankcase 3 of the cylinder block 2 of the engine 1, intake and exhaust valves (not shown) in the cylinder head 5 are opened and closed via a tappet 9, a push rod 10, and a valve mechanism (not shown). A camshaft 8 is provided parallel to the crankshaft 7 in the engine 1,
Further, on the outside of the crankcase 3, a fuel injection pump 11 for supplying fuel to the fuel injection valve 6 in the cylinder head 5 is provided via a gear case 12 attached to the cylinder block 2.
前記燃料噴射ポンプ１１における入力軸１３に
は、従来公知の遠心式等の進角機構１４を設け、
該進角機構１４の入力軸に、前記クランク軸７の
回転を、スプロケツト１５，１６及びその間に巻
き掛けしたチエン１７にて1/2に減速して伝達す
る一方、前記進角機構１４の出力側を、燃料噴射
ポンプ１１の入力軸１３に連結すると共に、互い
に噛合する同じ歯数の歯車１８，１９を介して、
前記吸・排気弁を開閉するためのカム軸８に動力
伝達するように構成する。 The input shaft 13 of the fuel injection pump 11 is provided with a conventionally known centrifugal advance mechanism 14,
The rotation of the crankshaft 7 is reduced to 1/2 and transmitted to the input shaft of the advance angle mechanism 14 by the sprockets 15 and 16 and the chain 17 wound between them, while the output of the advance angle mechanism 14 is transmitted to the input shaft of the advance angle mechanism 14. The side is connected to the input shaft 13 of the fuel injection pump 11, and via gears 18 and 19 having the same number of teeth that mesh with each other,
It is configured to transmit power to a camshaft 8 for opening and closing the intake and exhaust valves.
この構成において、エンジン１の回転数が早く
なれば、進角機構１４がその出力側の位相を回転
数に比例して進角方向に進ませるように作動する
から、燃料噴射ポンプ１１における燃料噴射の時
期は、低回転時よりも早い時期に進角されると同
時に、カム軸８による吸・排気弁の開閉の時期を
低回転時よりも早い時期に進角されることにな
り、また、エンジン１の回転数が遅くなれば、進
角機構１４によつて燃料噴射の時期が高い回転時
よりも遅角されると共に、吸・排気弁の回転の時
期も遅角されると言うように、燃料の噴射時期及
び吸・排気弁の開閉時期は、一定の位相関係を保
つた状態のまま、エンジンの回転数に応じて、進
角又は遅角に制御されるのである。 In this configuration, when the rotation speed of the engine 1 increases, the advance angle mechanism 14 operates to advance the phase on the output side in the advance direction in proportion to the rotation speed, so that the fuel injection in the fuel injection pump 11 The timing of is advanced earlier than when the rotation speed is low, and at the same time, the timing of opening and closing of the intake and exhaust valves by the camshaft 8 is advanced earlier than when the rotation speed is low. As the rotation speed of the engine 1 becomes lower, the timing of fuel injection is retarded by the advance mechanism 14 compared to when the rotation speed is high, and the timing of rotation of the intake and exhaust valves is also retarded. The fuel injection timing and the opening/closing timing of the intake and exhaust valves are controlled to be advanced or retarded depending on the engine speed while maintaining a constant phase relationship.
なお、前記進角機構１４を、吸・排気弁の開閉
用カム軸８等のように、燃料噴射ポンプ１１以外
の箇所に設けて、その出力側から、燃料噴射ポン
プ１１及び吸・排気弁の開閉用カム軸３に動力伝
達するように構成しても良いのである。 Note that the advance mechanism 14 is provided at a location other than the fuel injection pump 11, such as the camshaft 8 for opening/closing the intake/exhaust valves, and the advance mechanism 14 is provided at a location other than the fuel injection pump 11, such as the camshaft 8 for opening/closing the intake/exhaust valves. It may be configured to transmit power to the opening/closing camshaft 3.
以上の通り本考案によれば、燃料噴射の時期を
エンジンの回転数に比例して進角制御するに際し
て、エンジンにおける吸・排気弁の開閉時期を
も、同時に進角でき、両者の位相関係を全回転域
にわたつて略一定に保持できるから、エンジンに
おける発生トルク曲線は、従来の尖つたものに比
べてなだらかになり、発生トルクを広い回転域に
わたつて向上できるのである。 As described above, according to the present invention, when the fuel injection timing is advanced in proportion to the engine speed, the opening and closing timings of the intake and exhaust valves in the engine can also be advanced at the same time, and the phase relationship between the two can be adjusted. Since it can be held substantially constant over the entire rotation range, the generated torque curve in the engine becomes gentler than the conventional sharp curve, and the generated torque can be improved over a wide rotation range.
しかも、エンジンにおける吸・排気弁の開閉時
期を、エンジンの回転数に比例して進角する進角
機構を、燃料噴射ポンプにおける進角機構と供用
するので、両方に別々の進角機構を設ける必要が
なく一つの進角機構で済み、構造が簡単になつて
安価に提供できると共に、取付けスペースの増大
延いてはエンジンの大型化を回避できるのであ
る。 Moreover, the advance mechanism that advances the opening and closing timing of the intake and exhaust valves in the engine in proportion to the engine speed is shared with the advance mechanism in the fuel injection pump, so separate advance mechanisms are provided for both. This eliminates the need for a single advance angle mechanism, which simplifies the structure and can be provided at low cost, and also avoids an increase in installation space and, in turn, an increase in the size of the engine.
図面は本考案の実施例を示し、第１図はエンジ
ンの一部切欠側面図、第２図は動力伝達部の平面
図である。
１……エンジン、２……シリンダブロツク、５
……シリンダヘツド、６……燃料噴射弁、７……
クランク軸、８……吸・排気弁の開閉用カム軸、
１１……燃料噴射ポンプ、１４……進角機構。
The drawings show an embodiment of the present invention, with FIG. 1 being a partially cutaway side view of the engine, and FIG. 2 being a plan view of the power transmission section. 1...Engine, 2...Cylinder block, 5
...Cylinder head, 6...Fuel injection valve, 7...
Crankshaft, 8...Camshaft for opening and closing intake and exhaust valves,
11... Fuel injection pump, 14... Advance angle mechanism.
Claims (1)
ポンプへの動力伝達部に、前記燃料噴射ポンプに
よる燃料の噴射時期をエンジンの回転数に比例し
て進角するようにした進角機構を設けて成る燃料
噴射式エンジンにおいて、前記エンジンにおける
吸・排気弁を開閉するカム軸に、前記進角機構の
出力側から動力伝達するように構成したことを特
徴とする燃料噴射式エンジン。 A fuel injection type comprising an advance mechanism that advances the timing of fuel injection by the fuel injection pump in proportion to the engine rotation speed, in a power transmission section from the engine to the fuel injection pump for the engine. 1. A fuel injection engine characterized in that the engine is configured such that power is transmitted from the output side of the advance angle mechanism to a camshaft that opens and closes intake and exhaust valves in the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7698478U JPS6141977Y2 (en) | 1978-06-05 | 1978-06-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7698478U JPS6141977Y2 (en) | 1978-06-05 | 1978-06-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54177417U JPS54177417U (en) | 1979-12-14 |
| JPS6141977Y2 true JPS6141977Y2 (en) | 1986-11-28 |
Family
ID=28992764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7698478U Expired JPS6141977Y2 (en) | 1978-06-05 | 1978-06-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6141977Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60112644U (en) * | 1983-12-31 | 1985-07-30 | いすゞ自動車株式会社 | Internal combustion engine advance device |
-
1978
- 1978-06-05 JP JP7698478U patent/JPS6141977Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54177417U (en) | 1979-12-14 |
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