JPH0130611Y2 - - Google Patents
Info
- Publication number
- JPH0130611Y2 JPH0130611Y2 JP1984152370U JP15237084U JPH0130611Y2 JP H0130611 Y2 JPH0130611 Y2 JP H0130611Y2 JP 1984152370 U JP1984152370 U JP 1984152370U JP 15237084 U JP15237084 U JP 15237084U JP H0130611 Y2 JPH0130611 Y2 JP H0130611Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- distribution pipe
- fuel distribution
- recess
- wall
- 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 79
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、エンジンへの燃料の噴射圧を調整す
る燃圧調整装置が設けられ、燃料噴射弁に燃料を
分配供給する燃料分配管に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fuel distribution pipe that is provided with a fuel pressure adjustment device that adjusts the injection pressure of fuel to an engine and that distributes and supplies fuel to fuel injection valves.
（従来技術）
従来のかかる燃料分配管は、例えば特開昭59−
96439号公報に示されるように、燃料分配管の軸
方向下流端において、断面矩形となつており、そ
の近傍の内壁上面にリターン通路が開口され、こ
のリターン通路に燃圧調整装置が接続されてい
た。ところが、このような形状では、燃料分配管
の内部を流れてきた燃料が、下流端正面の壁に衝
突して上下に分かれて乱流が生じ、燃料中に混入
していた気泡（ベーパ）が燃料分配管の下流端先
端部にたまり、時には燃料噴射弁に燃料と共に気
泡が送られるようなことが生じていた。このよう
に気泡がたまつた状態態になると、気泡は圧縮性
があるため、ダンピング作用を起こし燃料圧が正
常でなくなり、エンジンに供給される空燃比
（Ａ／Ｆ）が正常でなくなるおそれがあつた。ま
た、上記の従来のものでは燃料中の気泡が燃料の
流れによつてスムースにリターン通路を通して燃
料分配管から排出されるような配慮が十分にはな
されていなかつた。(Prior art) Such a conventional fuel distribution pipe is disclosed in, for example, Japanese Patent Application Laid-Open No. 1986-
As shown in Publication No. 96439, the downstream end of the fuel distribution pipe in the axial direction has a rectangular cross section, and a return passage is opened on the upper surface of the inner wall near the end, and a fuel pressure adjustment device is connected to this return passage. . However, with this shape, the fuel flowing inside the fuel distribution pipe collides with the front wall of the downstream end and splits into upper and lower parts, creating a turbulent flow and causing the air bubbles (vapor) mixed in the fuel to Bubbles accumulated at the tip of the downstream end of the fuel distribution pipe, and sometimes air bubbles were sent to the fuel injection valve along with the fuel. When air bubbles accumulate in this way, since the air bubbles are compressible, they cause a damping effect, causing the fuel pressure to become abnormal and the air-fuel ratio (A/F) supplied to the engine to be abnormal. It was hot. Further, in the above-mentioned conventional devices, sufficient consideration has not been taken to ensure that bubbles in the fuel are smoothly discharged from the fuel distribution pipe through the return passage due to the flow of the fuel.
（考案の目的）
本考案は上記従来の問題点を解消するもので、
燃料分配管の内壁の形状およびリターン通路の開
口位置を工夫することにより、燃料中の気泡が燃
料噴射弁に燃料と共に送られることをなくし、か
つ、気泡だまりを防止することを目的とする。(Purpose of the invention) This invention solves the above conventional problems.
By devising the shape of the inner wall of the fuel distribution pipe and the opening position of the return passage, the purpose is to prevent air bubbles in the fuel from being sent together with the fuel to the fuel injection valve and to prevent air bubbles from accumulating.
（考案の構成）
本考案は、燃圧調整装置が設けられるととも
に、軸方向に延び複数の燃料噴射弁に燃料を分配
供給する燃料噴射式エンジンの燃料分配管におい
て、上記燃料分配管下流端近傍で、かつ上方の内
壁に上流側から下流側にかけて下方に延びる傾斜
面を有する突出部を設け、該突出部下流で、かつ
上方の内壁に凹部を設けるとともに、該凹部に対
向する燃料分配管下方の内壁に上流側から下流側
にかけて上方に延びる傾斜面を有する突出部を設
け、上記凹部の最深部にリターン通路を開口させ
たものである。この構成によれば、燃料分配管内
の燃料の流れにより、燃料中の気泡はスムースに
リターン通路に押しやられて下流端近傍に気泡だ
まりを生じるようなことはなくなる。(Structure of the invention) The present invention provides a fuel distribution pipe for a fuel injection engine that is provided with a fuel pressure adjustment device and that extends in the axial direction and distributes fuel to a plurality of fuel injection valves, in the vicinity of the downstream end of the fuel distribution pipe. , and a protrusion having an inclined surface extending downward from the upstream side to the downstream side is provided on the upper inner wall, and a recess is provided in the upper inner wall downstream of the protrusion, and a lower part of the fuel distribution pipe opposite to the recess is provided. A protrusion having an inclined surface extending upward from the upstream side to the downstream side is provided on the inner wall, and a return passage is opened at the deepest part of the recess. According to this configuration, the air bubbles in the fuel are smoothly pushed into the return passage by the flow of fuel in the fuel distribution pipe, and no air bubbles accumulate near the downstream end.
（実施例）
本考案の一実施例による燃料分配管の全体構成
を第１図に示す。同図において、１は燃料分配管
で、軸方向に複数の燃料噴射弁２ａ，２ｂ，２
ｃ，２ｄが設けられている。この燃料分配管１の
一端側には燃料供給管３が接続され、他端下流側
近傍には燃圧調整装置４が設けられている。この
下流端部分の構成を第２図乃至第４図に示す。こ
れらの図において、５は燃料分配管１の下流端近
傍の上方内壁に上流側から下流側にかけて下方に
延びる傾斜面５ａを有する突出部で、この突出部
５下流に燃料分配管１の下流端側から上流側にか
けて上方に延びる傾斜面６ａを有する凹部６を設
けている。７は上記凹部６に対応する燃料分配管
１の下方内壁に上流側から下流側にかけて上方に
延びるように形成した傾斜面で、この傾斜面７で
もつて突出部８を設けている。また、上記凹部６
の最深部にリターン通路９を開口し、この開口に
連通して上記燃圧調整装置４が設けられている。
１０は燃料分配管１の下流端に設けられた燃料噴
射弁２ｄ取付用の開口である。１１は燃料分配管
１の下流端に設けられたプラグであり、このプラ
グ１１は下流端の壁を形成するものであれば、い
かなる部材であつてもよい。(Embodiment) FIG. 1 shows the overall configuration of a fuel distribution pipe according to an embodiment of the present invention. In the figure, 1 is a fuel distribution pipe, and a plurality of fuel injection valves 2a, 2b, 2 are arranged in the axial direction.
c, 2d are provided. A fuel supply pipe 3 is connected to one end of the fuel distribution pipe 1, and a fuel pressure adjustment device 4 is provided near the other end on the downstream side. The configuration of this downstream end portion is shown in FIGS. 2 to 4. In these figures, reference numeral 5 denotes a protrusion having an inclined surface 5a extending downward from the upstream side to the downstream side on the upper inner wall near the downstream end of the fuel distribution pipe 1. A recess 6 having an inclined surface 6a extending upward from the side to the upstream side is provided. Reference numeral 7 denotes an inclined surface formed on the lower inner wall of the fuel distribution pipe 1 corresponding to the recess 6 so as to extend upward from the upstream side to the downstream side, and a protrusion 8 is also provided on this inclined surface 7. In addition, the recess 6
A return passage 9 is opened at the deepest part of the cylinder, and the fuel pressure adjustment device 4 is provided in communication with this opening.
Reference numeral 10 denotes an opening provided at the downstream end of the fuel distribution pipe 1 for attaching the fuel injection valve 2d. Reference numeral 11 denotes a plug provided at the downstream end of the fuel distribution pipe 1, and this plug 11 may be any member as long as it forms the wall of the downstream end.
上記構成によれば、燃料分配管１に燃料が第２
図の矢印のごとく流入し、傾斜面５ａおよび７の
働きにより凹部６に動圧がかからなくなり、下流
端近傍にて従来のように乱流が生じることなく、
スムースに流れて、燃料中に混入していた気泡は
凹部６に押しやられる。特に気泡は浮力により上
方の内壁に付着しやすいが、傾斜面５ａがあるた
め燃料の動圧により凹部６に移動させられる。し
たがつて、気泡は凹部６の最深部に開口したリタ
ーン通路９より燃料分配管の外へ導出され、内部
の下流端近傍にたまることがなくなる。したがつ
て、燃料噴射弁２ａ，２ｂ，２ｃ，２ｄに空気が
送られることはなくなり、また、気泡だまりによ
るダンピング作用が生じることもなくなる。 According to the above configuration, fuel is supplied to the fuel distribution pipe 1 from the second
The flow flows as shown by the arrow in the figure, and due to the action of the inclined surfaces 5a and 7, no dynamic pressure is applied to the recess 6, and turbulence does not occur near the downstream end as in the conventional case.
The fuel flows smoothly, and the air bubbles mixed in the fuel are pushed into the recess 6. In particular, bubbles tend to adhere to the upper inner wall due to buoyancy, but because of the inclined surface 5a, they are moved to the recess 6 by the dynamic pressure of the fuel. Therefore, the air bubbles are led out of the fuel distribution pipe through the return passage 9 opened at the deepest part of the recess 6, and do not accumulate near the downstream end inside. Therefore, air is no longer sent to the fuel injection valves 2a, 2b, 2c, and 2d, and damping effects due to air bubbles are no longer generated.
（考案の効果）
以上のように本考案によれば、燃料分配管の下
流端近傍で、かつ上方の内壁に上流側から下流側
にかけて下方に延びる傾斜面を有する突出部を設
け、該突出部下流で、かつ上方の内壁に凹部を設
けるとともに、該凹部に対向する下方内壁に上流
側から下流側にかけて上方に延びる傾斜面を形成
した突出部を設け、この凹部の最深部にリターン
通路を開口したことにより、燃料分配管の下流端
近傍において燃料がスムーズにリターン通路へ流
れるように燃料の流れに指向性をもたせることが
できる。そしてこの燃料の流れが燃料分配管下流
端での気泡だまりを防止し、したがつて、エンジ
ンへ燃料と共に気泡が送られることがなくなり、
また、気泡の圧縮性に基くダンピング作用もなく
なり、空燃比（Ａ／Ｆ）が正常でなくなるといつ
たことが解消される。(Effects of the invention) As described above, according to the invention, a protrusion having an inclined surface extending downward from the upstream side to the downstream side is provided on the upper inner wall near the downstream end of the fuel distribution pipe, and the protrusion A recess is provided in the upper inner wall at the downstream side, and a protrusion having an inclined surface extending upward from the upstream side to the downstream side is provided in the lower inner wall opposite to the recess, and a return passage is opened at the deepest part of the recess. By doing so, it is possible to give directionality to the flow of fuel so that the fuel flows smoothly to the return passage near the downstream end of the fuel distribution pipe. This fuel flow prevents air bubbles from accumulating at the downstream end of the fuel distribution pipe, thus preventing air bubbles from being sent along with the fuel to the engine.
Further, the damping effect based on the compressibility of the bubbles is also eliminated, and problems caused by the air-fuel ratio (A/F) becoming abnormal are eliminated.
第１図は本考案の一実施例による燃料噴射式エ
ンジンの燃料分配管の全体斜視図、第２図は同燃
料分配管本体の下流端近傍の断面図、第３図は同
燃料分配管本体と燃圧調整装置、燃料噴射弁の取
付状態を示す部分断面正面図、第４図は同部分断
面側面図である。
１……燃料分配管、２ａ，２ｂ，２ｃ，２ｄ…
…燃料噴射弁、４……燃圧調整装置、５ａ……傾
斜面、６……凹部、７……傾斜面、５，８……突
出部、９……リターン通路。
Fig. 1 is an overall perspective view of a fuel distribution pipe of a fuel injection type engine according to an embodiment of the present invention, Fig. 2 is a sectional view of the vicinity of the downstream end of the main body of the fuel distribution pipe, and Fig. 3 is a main body of the fuel distribution pipe. FIG. 4 is a partially sectional front view showing the mounting state of the fuel pressure regulator and fuel injection valve, and FIG. 4 is a partially sectional side view thereof. 1...Fuel distribution pipe, 2a, 2b, 2c, 2d...
...Fuel injection valve, 4...Fuel pressure adjustment device, 5a...Slope, 6...Recess, 7...Slope, 5, 8...Protrusion, 9...Return passage.
Claims (1)
延び複数の燃料噴射弁に燃料を分配供給する燃料
噴射式エンジンの燃料分配管において、上記燃料
分配管下流端近傍で、かつ上方の内壁に上流側か
ら下流側にかけて下方に延びる傾斜面を有する突
出部を設け、該突出部下流で、かつ上方の内壁に
凹部を設けるとともに、該凹部に対向する燃料分
配管下方の内壁に上流側から下流側にかけて上方
に延びる傾斜面を有する突出部を設け、上記凹部
の最深部にリターン通路を開口させたことを特徴
とする燃料噴射式エンジンの燃料分配管。 In a fuel distribution pipe of a fuel injection engine that is provided with a fuel pressure adjustment device and that extends in the axial direction and distributes fuel to a plurality of fuel injection valves, a fuel distribution pipe is provided near the downstream end of the fuel distribution pipe and on an upper inner wall from the upstream side. A protrusion having an inclined surface extending downward toward the downstream side is provided, a recess is provided on the inner wall downstream and above the protrusion, and a recess is provided on the lower inner wall of the fuel distribution pipe opposite to the recess from the upstream side to the downstream side. 1. A fuel distribution pipe for a fuel injection type engine, characterized in that a protruding part having an inclined surface extending in the recessed part is provided, and a return passage is opened at the deepest part of the recessed part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984152370U JPH0130611Y2 (en) | 1984-10-09 | 1984-10-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984152370U JPH0130611Y2 (en) | 1984-10-09 | 1984-10-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6166660U JPS6166660U (en) | 1986-05-07 |
| JPH0130611Y2 true JPH0130611Y2 (en) | 1989-09-19 |
Family
ID=30710432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984152370U Expired JPH0130611Y2 (en) | 1984-10-09 | 1984-10-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0130611Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5758374U (en) * | 1980-09-22 | 1982-04-06 | ||
| JPS57171073A (en) * | 1981-04-15 | 1982-10-21 | Nippon Denso Co Ltd | Fuel injection device |
-
1984
- 1984-10-09 JP JP1984152370U patent/JPH0130611Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5758374U (en) * | 1980-09-22 | 1982-04-06 | ||
| JPS57171073A (en) * | 1981-04-15 | 1982-10-21 | Nippon Denso Co Ltd | Fuel injection device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6166660U (en) | 1986-05-07 |
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