JPH0426690Y2 - - Google Patents
Info
- Publication number
- JPH0426690Y2 JPH0426690Y2 JP1985129011U JP12901185U JPH0426690Y2 JP H0426690 Y2 JPH0426690 Y2 JP H0426690Y2 JP 1985129011 U JP1985129011 U JP 1985129011U JP 12901185 U JP12901185 U JP 12901185U JP H0426690 Y2 JPH0426690 Y2 JP H0426690Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- damper
- pipe
- delivery
- delivery pipe
- 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 73
- 238000002347 injection Methods 0.000 claims description 41
- 239000007924 injection Substances 0.000 claims description 41
- 230000010349 pulsation Effects 0.000 claims description 24
- 239000002828 fuel tank Substances 0.000 description 5
- 230000000737 periodic effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Pipe Accessories (AREA)
- 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、エンジンの燃料供給装置に関し、特
に燃料噴射式エンジンにおける燃料分配用デリバ
リパイプ内の燃料圧の脈動を吸収するようにした
ものに関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a fuel supply system for an engine, and particularly to one that absorbs the pulsation of fuel pressure in a delivery pipe for fuel distribution in a fuel injection engine. .
（従来技術）
従来、燃料噴射式ガソリンエンジンにおいて
は、燃料ポンプで加圧された加圧燃料がデリバリ
パイプに圧送され、デリバリパイプから分岐管を
介して噴射ノズルへ分配供給されるようになつて
いる。(Prior Art) Conventionally, in a fuel injection type gasoline engine, pressurized fuel is pressurized by a fuel pump and is sent to a delivery pipe, and distributed from the delivery pipe to an injection nozzle via a branch pipe. There is.
ところで、上記燃料供給系の加圧燃料には、ポ
ンプの吐出圧の周期的変動に伴なう脈動が生じる
だけでなく、１つの噴射ノズルを閉弁作動させた
ときに反射波の脈動も生じることになる。 By the way, in the pressurized fuel in the fuel supply system, not only pulsations occur due to periodic fluctuations in the discharge pressure of the pump, but also pulsations of reflected waves occur when one injection nozzle is operated to close. It turns out.
特に、最近の高出力エンジンの場合には、燃料
圧力も高く、燃料噴射量も多いので、上記閉弁作
動に伴なう圧力脈動が顕著に現われ、この脈動が
吐出圧変動による脈動と重畳して正常な燃料噴射
を妨げ、燃料噴射量にバラツキが生じ、所定量の
燃料が噴射されなくなるという問題がある。 In particular, in the case of recent high-output engines, the fuel pressure is high and the amount of fuel injected is large, so the pressure pulsations associated with the above-mentioned valve closing operation appear prominently, and this pulsation is superimposed with the pulsations due to discharge pressure fluctuations. There is a problem in that this prevents normal fuel injection, causes variations in the amount of fuel injection, and prevents a predetermined amount of fuel from being injected.
そこで、実開昭55−20620号公報には、デリバ
リパイプの少なくとも一端部に燃料の脈動を吸収
する各種のダンパを設けた燃料供給管装置が記載
されている。 Therefore, Japanese Utility Model Application Publication No. 55-20620 discloses a fuel supply pipe device in which various dampers for absorbing fuel pulsation are provided at at least one end of a delivery pipe.
（考案が解決しようとする問題点）
上記公報に記載された燃料供給装置において
は、デリバリパイプの端部にダンパを設けるの
で、デリバリパイプの全長が長くなりまたダンパ
の機構上ダンパが大径化し、全体としてデリバリ
パイプが大形化・複雑化するだけでなく、複数の
ダンパをユニツト化して小形化することが難しい
などの欠点がある。(Problems to be solved by the invention) In the fuel supply device described in the above publication, since a damper is provided at the end of the delivery pipe, the overall length of the delivery pipe becomes long, and the damper has a large diameter due to its mechanism. However, there are drawbacks such as not only the delivery pipe as a whole becoming larger and more complicated, but also that it is difficult to make a plurality of dampers into a unit and make it smaller.
（問題点を解決するための手段）
本考案のエンジンの燃料供給装置は、燃料噴射
ノズルへ燃料を分配するデリバリパイプを直線状
に配設し、複数の燃料噴射ノズルへ夫々接続され
る複数の分岐管をデリバリパイプから略平行に分
岐させたエンジンの燃料供給装置において、上記
デリバリパイプ内の、噴射タイミングにおいて隣
り合う燃料噴射ノズルへの分岐管同士間に燃料の
脈動を吸収するダンパを装着したものである。(Means for Solving the Problems) The engine fuel supply system of the present invention has a delivery pipe that distributes fuel to the fuel injection nozzles arranged in a straight line, and a plurality of delivery pipes each connected to the plurality of fuel injection nozzles. In an engine fuel supply system in which branch pipes are branched approximately parallel to each other from a delivery pipe, a damper is installed between the branch pipes to adjacent fuel injection nozzles in the delivery pipe to absorb fuel pulsations at the injection timing. It is something.
（作用）
本考案のエンジンの燃料供給装置においては、
デリバリパイプ内の、噴射タイミングにおいて隣
り合う燃料噴射ノズルの分岐管同士間にダンパを
装着するので、先に噴射する燃料噴射ノズルの閉
弁に伴つて生じる脈動が次に噴射する燃料噴射ノ
ズルの作動に全く影響を及ぼさなくなる。(Function) In the engine fuel supply device of the present invention,
Since a damper is installed between the branch pipes of adjacent fuel injection nozzles in the delivery pipe at the injection timing, the pulsation caused by the closing of the fuel injection nozzle that injects first will cause the activation of the fuel injection nozzle that will inject next. will have no effect at all.
（考案の効果）
本考案のエンジンの燃料供給装置においては、
以上のように、デリバリパイプを直線状に配設
し、複数の燃料噴射ノズルへ夫々接続された複数
の分岐管をデリバリパイプから略平行に分岐さ
せ、そのデリバリパイプ内の噴射タイミングにお
いて隣り合う燃料噴射ノズルへの分岐管同士間に
燃料の脈動を吸収するダンパを装着するので、ダ
ンパのためにデリバリパイプが大形化するのを防
ぐことが出来るうえ、上記ダンパをその両端部に
夫々ダンピング機構を組込んだユニツト状のもの
に構成することが出来る。(Effect of the invention) In the engine fuel supply system of the invention,
As described above, the delivery pipe is arranged in a straight line, and the plurality of branch pipes connected to the plurality of fuel injection nozzles are branched out from the delivery pipe approximately in parallel, so that adjacent fuels are Since a damper that absorbs fuel pulsation is installed between the branch pipes to the injection nozzle, it is possible to prevent the delivery pipe from becoming larger due to the damper, and the damper is installed at each end of the damper with a damping mechanism. It can be constructed into a unit-like structure that incorporates.
更に、噴射タイミングにおいて隣り合う燃料噴
射ノズルの分岐管同士間にダンパを装着するの
で、先に噴射する燃料噴射ノズルの閉弁に伴なつ
て生じる脈動が、次に噴射する燃料噴射ノズルの
作動に全く影響しなくなり、上記脈動による燃料
噴射量のバラツキを解消することが出来る。 Furthermore, since a damper is installed between the branch pipes of adjacent fuel injection nozzles at the injection timing, the pulsation that occurs due to the valve closing of the fuel injection nozzle that injects first affects the operation of the fuel injection nozzle that injects next. There is no influence at all, and the variation in fuel injection amount due to the pulsation can be eliminated.
（実施例）
以下、本考案の実施例を図面に基いて説明す
る。(Example) Hereinafter, an example of the present invention will be described based on the drawings.
第１図は、立形２気筒燃料噴射式ガソリンエン
ジンＥの燃料供給装置を示すもので、各気筒１
ａ，１ｂの吸気ポート２へ夫々連なる分岐吸気管
３ａ，３ｂには低負荷用噴射ノズル４ａと高負荷
用噴射ノズル４ｂとが装着され、上記４個の噴射
ノズル４ａ，４ｂは夫々分岐管５ａ，５ｂでデリ
バリパイプ６へ接続されている。 Figure 1 shows the fuel supply system for a vertical two-cylinder fuel injection type gasoline engine E.
A low-load injection nozzle 4a and a high-load injection nozzle 4b are attached to the branch intake pipes 3a and 3b, which are connected to the intake ports 2 of a and 1b, respectively, and the four injection nozzles 4a and 4b are connected to the branch pipe 5a, respectively. , 5b to the delivery pipe 6.
第１図・第２図に示すように、上記デリバリパ
イプ６の長さ方向中央部にはダンパ部材７が装着
され、デリバリパイプ６内はダンパ部材７を境界
として第１デリバリ室６ａと第２デリバリ室６ｂ
とに区画され、第１気筒１ａの分岐吸気管３ａの
低負荷用噴射ノズル４ａへ連なる分岐管５ａと高
負荷用噴射ノズル４ｂへ連なる分岐管５ｂとが上
記第１デリバリ室６ａへ接続され、また第２気筒
１ｂ（図示略）の分岐吸気管３ｂの低負荷用噴射
ノズル４ａへ連なる分岐管５ａと高負荷用噴射ノ
ズル４ｂへ連なる分岐管５ｂとが上記第２デリバ
リ室６ｂへ接続されている。 As shown in FIGS. 1 and 2, a damper member 7 is attached to the central portion of the delivery pipe 6 in the length direction, and the interior of the delivery pipe 6 is divided into a first delivery chamber 6a and a second delivery chamber with the damper member 7 as a boundary. Delivery room 6b
A branch pipe 5a connected to the low-load injection nozzle 4a of the branch intake pipe 3a of the first cylinder 1a and a branch pipe 5b connected to the high-load injection nozzle 4b are connected to the first delivery chamber 6a, Further, a branch pipe 5a connected to the low-load injection nozzle 4a and a branch pipe 5b connected to the high-load injection nozzle 4b of the branch intake pipe 3b of the second cylinder 1b (not shown) are connected to the second delivery chamber 6b. There is.
また、燃料タンク８に上流端が接続された燃料
供給管９は途中で第１燃料供給管９ａと第２燃料
管９ｂとに分岐し、上記第１及び第２燃料供給管
９ａ，９ｂは夫々第１及び第２デリバリ室６ａ，
６ｂに接続され、第１燃料供給管９ａの燃料ポン
プ１０ａで第１デリバリ室６ａへまた第２燃料供
給管９ｂの燃料ポンプ１０ｂで第２デリバリ室６
ｂへ燃料が圧送されるようになつている。 Further, the fuel supply pipe 9 whose upstream end is connected to the fuel tank 8 branches into a first fuel supply pipe 9a and a second fuel pipe 9b in the middle, and the first and second fuel supply pipes 9a and 9b are connected to the fuel tank 8, respectively. first and second delivery chambers 6a,
6b, the fuel pump 10a of the first fuel supply pipe 9a is connected to the first delivery chamber 6a, and the fuel pump 10b of the second fuel supply pipe 9b is connected to the second delivery chamber 6.
Fuel is pumped to b.
更に、第１及び第２デリバリ室６ａ，６ｂには
夫々リリーフ弁１１ａ，１１ｂが接続され、各リ
リーフ弁１１ａ，１１ｂは燃料戻り管１２で燃料
タンク８へ接続されている。 Furthermore, relief valves 11a and 11b are connected to the first and second delivery chambers 6a and 6b, respectively, and each relief valve 11a and 11b is connected to the fuel tank 8 through a fuel return pipe 12.
第２図・第３図に示すように、上記ダンパ部材
７には第１デリバリ室６ａに臨み第１デリバリ室
６ａの燃料の脈動を吸収する第１ダンパ７ａと第
２デリバリ室６ｂに臨み第２デリバリ室６ｂの燃
料の脈動を吸収する第２ダンパ７ｂとが設けられ
ている。 As shown in FIGS. 2 and 3, the damper member 7 includes a first damper 7a facing the first delivery chamber 6a and absorbing the pulsation of fuel in the first delivery chamber 6a, and a damper 7a facing the second delivery chamber 6b. A second damper 7b is provided to absorb the pulsation of fuel in the second delivery chamber 6b.
上記第１ダンパ７ａと第２ダンパ７ｂとは第３
図に図示のように対称の構造なので、第１ダンパ
７ａについてのみ説明すると、ダンパ部材本体１
３の第１デリバリ室６ａ側の端部にはシリンダ穴
１４が凹設され、このシリンダ穴１４内に奥方か
ら順に圧縮バネ１５とキヤツプ状のピストン１６
とが装着され、上記ピストン１６はシリンダ穴１
４の外周壁の端縁１７で係止されるとともにピス
トン１６に挿通させてシリンダ穴１４の奥端壁に
螺着したネジ１８で係止され、上記ピストン１６
よりも奥方のシリンダ穴１４内には空気室１９が
形成され、上記空気室１９へ燃料が侵入しないよ
うにピストン１６の外周部とネジ孔内周部にはＯ
リング２０，２１が装着され、第１デリバリ室６
ａの燃料に脈動が生じるとその脈動圧でピストン
１６が空気室１９側へ移動し脈動を吸収するよう
になつている。 The first damper 7a and the second damper 7b are
Since the structure is symmetrical as shown in the figure, only the first damper 7a will be explained.
A cylinder hole 14 is recessed in the end of the cylinder 3 on the first delivery chamber 6a side, and a compression spring 15 and a cap-shaped piston 16 are installed in this cylinder hole 14 in order from the back.
is installed, and the piston 16 is inserted into the cylinder hole 1.
4 and is locked by a screw 18 inserted through the piston 16 and screwed into the inner end wall of the cylinder hole 14.
An air chamber 19 is formed in the cylinder hole 14 at the inner side of the piston 16 and an O2 hole is formed in the outer circumference of the piston 16 and the inner circumference of the screw hole to prevent fuel from entering the air chamber 19.
The rings 20 and 21 are attached, and the first delivery chamber 6
When pulsations occur in the fuel in the fuel tank a, the pulsating pressure causes the piston 16 to move toward the air chamber 19 to absorb the pulsations.
上記ダンパ部材７をデリバリパイプ６内に装着
するために、上記ダンパ部材７の中央部に対応す
る位置でデリバリパイプ６が分断されていて、上
記ダンパ部材７を装着してからターンバツクル式
のナツト部材２２で連結される。尚、符号２３は
Ｏリングである。 In order to install the damper member 7 into the delivery pipe 6, the delivery pipe 6 is divided at a position corresponding to the center of the damper member 7, and after the damper member 7 is installed, a turnbuckle type nut member is inserted. 22. Note that the reference numeral 23 is an O-ring.
以上の構造において、デリバリパイプ６内の第
１デリバリ室６ａへは燃料供給管９，９ａとポン
プ１０ａとで加圧燃料が供給され、第２デリバリ
室６ｂへは燃料供給管９，９ｂとポンプ１０ｂと
で加圧燃料が供給される。 In the above structure, pressurized fuel is supplied to the first delivery chamber 6a in the delivery pipe 6 by the fuel supply pipes 9, 9a and the pump 10a, and pressurized fuel is supplied to the second delivery chamber 6b by the fuel supply pipes 9, 9b and the pump. 10b, pressurized fuel is supplied.
そして、第１及び第２デリバリ室６ａ，６ｂ内
の燃料圧が夫々設定値以上になるとリリーフ弁１
１ａ，１１ｂが開き、加圧燃料の一部が燃料戻り
管１２で燃料タンク８へ戻される。 When the fuel pressure in the first and second delivery chambers 6a, 6b respectively exceeds the set value, the relief valve 1
1a and 11b are opened, and a portion of the pressurized fuel is returned to the fuel tank 8 via the fuel return pipe 12.
上記第１デリバリ室６ａ内の加圧燃料は分岐管
５ａ，５ｂで夫々低負荷用噴射ノズル４ａ及び高
負荷用噴射ノズル４ｂへ供給され、所定のタイミ
ングにて第１分岐吸気管３ａ内へ噴射され、第１
吸気管１ａへ吸入される。 The pressurized fuel in the first delivery chamber 6a is supplied to the low-load injection nozzle 4a and the high-load injection nozzle 4b through branch pipes 5a and 5b, respectively, and is injected into the first branch intake pipe 3a at a predetermined timing. and the first
The air is inhaled into the intake pipe 1a.
上記第２デリバリ室６ｂ内の加圧燃料は分岐管
５ａ，５ｂで夫々低負荷用噴射ノズル４ａ及び高
負荷用噴射ノズル４ｂへ供給され、所定のタイミ
ングにて第２分岐吸気管３ｂ内へ噴射され、第２
気筒１ｂへ吸入される。 The pressurized fuel in the second delivery chamber 6b is supplied to the low-load injection nozzle 4a and the high-load injection nozzle 4b through branch pipes 5a and 5b, respectively, and is injected into the second branch intake pipe 3b at a predetermined timing. and the second
It is sucked into cylinder 1b.
ここで、第１デリバリ室６ａについては、ポン
プ１０ａの吐出圧の周期的変動に伴なう燃料圧力
の脈動及び噴射ノズル４ａ，４ｂの閉弁時の反射
波による脈動が生じ、これらの脈動は第１ダンパ
７ａで吸収されることになる。 Here, in the first delivery chamber 6a, pulsations occur in the fuel pressure due to periodic fluctuations in the discharge pressure of the pump 10a and pulsations due to reflected waves when the injection nozzles 4a and 4b close, and these pulsations occur. This will be absorbed by the first damper 7a.
また、第２デリバリ室６ｂについては、ポンプ
１０ｂの吐出圧の周期的変動に伴なう燃料圧力の
脈動及び噴射ノズル４ａ，４ｂの閉弁時の反射波
による脈動が生じ、これらの脈動は第２ダンパ７
ｂで吸収されることになる。 Further, regarding the second delivery chamber 6b, pulsations in the fuel pressure due to periodic fluctuations in the discharge pressure of the pump 10b and pulsations due to reflected waves when the injection nozzles 4a and 4b are closed occur, and these pulsations occur in the second delivery chamber 6b. 2 damper 7
It will be absorbed by b.
尚、上記第１ダンパ７ａ及び第２ダンパ７ｂ
は、弾性膜やダイヤフラムで脈動を吸収するよう
な構造に構成することも有り得る。 Note that the first damper 7a and the second damper 7b
It is also possible to have a structure that absorbs pulsations using an elastic membrane or diaphragm.
尚、上記実施例の燃料供給装置は、２ロータ型
ロータリピストンエンジンに適用することが出来
る。 Incidentally, the fuel supply device of the above embodiment can be applied to a two-rotor type rotary piston engine.
また、４気筒エンジンの燃料供給装置にも略同
様に適用し得るけれども、その場合にはデリバリ
パイプ内に２個の上記ダンパ部材を装着する必要
がある。 Furthermore, the present invention can be applied in substantially the same manner to a fuel supply system for a four-cylinder engine, but in that case, it is necessary to install two of the damper members in the delivery pipe.
図面は、本考案の実施例を示すもので、第１図
は立型２気筒エンジンの燃料供給装置の全体構成
図、第２図はデリバリパイプの断面図、第３図は
第２図部拡大図である。
４ａ……低負荷用噴射ノズル、４ｂ……高負荷
用噴射ノズル、５ａ，５ｂ……分岐管、６……デ
リバリパイプ、７……ダンパ部材、７ａ……第１
ダンパ、７ｂ……第２ダンパ。
The drawings show an embodiment of the present invention. Figure 1 is an overall configuration diagram of a fuel supply system for a vertical two-cylinder engine, Figure 2 is a sectional view of a delivery pipe, and Figure 3 is an enlarged view of the second part. It is a diagram. 4a... Low load injection nozzle, 4b... High load injection nozzle, 5a, 5b... Branch pipe, 6... Delivery pipe, 7... Damper member, 7a... First
Damper, 7b...Second damper.
Claims (1)
プを直線状に配設し、複数の燃料噴射ノズルへ
夫々接続される複数の分岐管をデリバリパイプか
ら略平行に分岐させたエンジンの燃料供給装置に
おいて、 上記デリバリパイプ内の、噴射タイミングにお
いて隣り合う燃料噴射ノズルへの分岐管同士間に
燃料の脈動を吸収するダンパを装着したことを特
徴とするエンジンの燃料供給装置。[Claim for Utility Model Registration] A delivery pipe that distributes fuel to fuel injection nozzles is arranged in a straight line, and a plurality of branch pipes connected to each of the plurality of fuel injection nozzles are branched from the delivery pipe substantially in parallel. A fuel supply device for an engine, characterized in that a damper for absorbing fuel pulsation is installed between the branch pipes in the delivery pipe to adjacent fuel injection nozzles at the injection timing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985129011U JPH0426690Y2 (en) | 1985-08-24 | 1985-08-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985129011U JPH0426690Y2 (en) | 1985-08-24 | 1985-08-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6238477U JPS6238477U (en) | 1987-03-07 |
| JPH0426690Y2 true JPH0426690Y2 (en) | 1992-06-26 |
Family
ID=31025201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985129011U Expired JPH0426690Y2 (en) | 1985-08-24 | 1985-08-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0426690Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520663B2 (en) * | 1975-10-08 | 1980-06-04 | ||
| JPS5520620B2 (en) * | 1972-09-20 | 1980-06-04 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520620U (en) * | 1978-07-25 | 1980-02-08 | ||
| JPS5520663U (en) * | 1978-07-27 | 1980-02-08 | ||
| JPS5590743U (en) * | 1978-12-20 | 1980-06-23 |
-
1985
- 1985-08-24 JP JP1985129011U patent/JPH0426690Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5520620B2 (en) * | 1972-09-20 | 1980-06-04 | ||
| JPS5520663B2 (en) * | 1975-10-08 | 1980-06-04 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238477U (en) | 1987-03-07 |
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