JPH0421003Y2 - - Google Patents
Info
- Publication number
- JPH0421003Y2 JPH0421003Y2 JP1985098975U JP9897585U JPH0421003Y2 JP H0421003 Y2 JPH0421003 Y2 JP H0421003Y2 JP 1985098975 U JP1985098975 U JP 1985098975U JP 9897585 U JP9897585 U JP 9897585U JP H0421003 Y2 JPH0421003 Y2 JP H0421003Y2
- Authority
- JP
- Japan
- Prior art keywords
- straight pipe
- cylinder head
- injection nozzle
- nozzle holder
- connection
- 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
Landscapes
- Fuel-Injection Apparatus (AREA)
- Joints Allowing Movement (AREA)
Description
【考案の詳細な説明】
「産業上の利用分野」
本考案は、燃料噴射ポンプと噴射ノズルホルダ
とを、連結ブロツク及び連結直管を介して連結す
る燃料高圧管の連結構造に関する。[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a high-pressure fuel pipe connection structure that connects a fuel injection pump and an injection nozzle holder via a connection block and a connection straight pipe.
「従来の技術」
従来、燃料噴射ポンプと、噴射ノズルホルダを
装着したシリンダヘツドとの間を連結する場合に
は、高圧配管用炭素鋼鋼管が用いられている。そ
して、この種の連結構造としては、第５図と第６
図に示すように、シリンダヘツド１に、噴射ノズ
ルホルダ２と該噴射ノズルホルダ２に対して直角
に連結された連通管３とが、それぞれ挿着される
と共に、該連通管３と燃料噴射ポンプ４との間
に、湾曲した高圧間（厚肉鋼管）５が接続されて
いるものが知られている。``Prior Art'' Conventionally, carbon steel pipes for high-pressure piping have been used to connect a fuel injection pump and a cylinder head equipped with an injection nozzle holder. This type of connection structure is shown in Figures 5 and 6.
As shown in the figure, an injection nozzle holder 2 and a communication pipe 3 connected at right angles to the injection nozzle holder 2 are inserted into the cylinder head 1, and the communication pipe 3 and the fuel injection pump It is known that a curved high-pressure pipe (thick-walled steel pipe) 5 is connected between the pipe and the pipe.
ところで、近年、燃費の改善を図るために、燃
料油の高圧短期噴射化が要求されてきており、高
圧管５の管内圧力を1500Kg／cm2の水準まで引き上
げることが要望されている。 Incidentally, in recent years, in order to improve fuel efficiency, there has been a demand for high-pressure short-term injection of fuel oil, and there is a demand for raising the internal pressure of the high-pressure pipe 5 to a level of 1500 kg/cm 2 .
「考案が解決しようとする問題点」
しかしながら、上記従来の炭素鋼鋼管を用いた
高圧管５にあつては、引抜製造時のしわ傷発生あ
るいは曲げ成形時の損傷等を完全に除去すること
が困難であり、管内圧力が1200Kg／cm2程度になる
と、折損し易く、かつ曲げ成形上、管径及び肉厚
に対して限度があるため、曲げ加工がしにくく、
取付不良が生じ易いという問題がある。``Problems to be solved by the invention'' However, in the case of the above-mentioned high-pressure pipe 5 using the conventional carbon steel pipe, it is impossible to completely eliminate wrinkles caused during drawing manufacturing or damage during bending. When the pressure inside the pipe reaches around 1200Kg/cm 2 , it is easy to break, and there are limits to the pipe diameter and wall thickness for bending, making it difficult to bend.
There is a problem in that poor installation is likely to occur.
本考案は、上記事情に鑑みてなされたもので、
その目的とするところは、燃料噴射ポンプと、噴
射ノズルホルダを装着したシリンダヘツドとの間
を連結する場合に、燃料油の圧力が1200Kg／cm2以
上になつても破損することがない上に、取付け易
く、取付不良に伴う燃料洩れを防止することがで
きる燃料高圧管の連結構造を提供することにあ
る。 This invention was made in view of the above circumstances,
The purpose of this is to prevent damage even if the fuel oil pressure exceeds 1200 kg/cm 2 when connecting the fuel injection pump and the cylinder head equipped with the injection nozzle holder. Another object of the present invention is to provide a connection structure for high pressure fuel pipes that is easy to install and can prevent fuel leakage due to poor installation.
「問題点を解決するための手段」
上記目的を達成するために、本考案は、燃料噴
射ポンプと噴射ノズルホルダとを、連結ブロツク
及び連結直管を介して連結する燃料高圧管の連結
構造において、上記連結直管が、シリンダヘツド
の端面に穿設された挿入孔に遊篏され、かつ上記
連結直管の両端に各々形成された球面凸部が、上
記噴射ノズルホルダに形成された凹部と、上記連
結ブロツクに形成された凹部とにそれぞれ嵌め込
まれると共に、上記連結ブロツクがシリンダヘツ
ドに固定されることにより、上記連結直管が連結
ブロツクと噴射ノズルホルダとの間に挟持され、
上記連結ブロツクとシリンダヘツドとの連結部に
シール部材が装着され、該シール部材は、上記連
結直管がその径方向に所要間隔をおいて遊篏され
ていると共に、上記シリンダヘツドに気密にかつ
摺動可能に嵌め込まれ、また、一端部において上
記連結ブロツクへ気密状態で連結されていること
を特徴とする。"Means for Solving the Problems" In order to achieve the above object, the present invention provides a fuel high pressure pipe connection structure that connects a fuel injection pump and an injection nozzle holder via a connection block and a connection straight pipe. , the connecting straight pipe is loosely inserted into an insertion hole drilled in an end face of the cylinder head, and spherical convex portions formed at both ends of the connecting straight pipe are connected to a recess formed in the injection nozzle holder. , the connecting straight pipe is held between the connecting block and the injection nozzle holder by fitting into the recesses formed in the connecting block and fixing the connecting block to the cylinder head,
A sealing member is attached to the connecting portion between the connecting block and the cylinder head, and the sealing member has the connecting straight pipe loosely connected to the cylinder head at a required interval in the radial direction, and is attached to the cylinder head in an airtight manner. It is characterized in that it is slidably fitted and is connected in an airtight manner to the connecting block at one end.
「作用」
本考案の燃料高圧管の連結構造にあつては、連
結直管の両端の球面凸部と、噴射ノズルホルダ及
び連結ブロツクの各凹部と、シール部材の一端と
シリンダヘツドの端面との間の間隙及びシール部
材と連結直管との間の間隙とによつて、連結ブロ
ツクと連結直管と噴射ノズルホルダとの間の三次
元方向のずれを吸収して、連結ブロツク、連結直
管及び噴射ノズルホルダを強固に連結する。``Operation'' In the high pressure fuel pipe connection structure of the present invention, the spherical convex portions at both ends of the connecting straight pipe, the respective recesses of the injection nozzle holder and the connection block, one end of the sealing member and the end surface of the cylinder head are connected. The gap between the connecting block, the connecting straight pipe, and the injection nozzle holder is absorbed by the gap between the connecting block, the connecting straight pipe, and the injection nozzle holder. and firmly connect the injection nozzle holder.
「実施例」
以下、第１図ないし第４図に基づいて本考案の
一実施例を説明する。"Embodiment" Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 4.
図中１０は、燃料噴射ポンプＡのポンプ外筒で
あり、このポンプ外筒１０の内部には、断面凸字
状の吐出弁ホルダ１１の下部大径部１１ａが嵌め
込まれており、この吐出弁ホルダ１１の下部大径
部１１ａとポンプ外筒１０との間には、Ｏリング
１２が装着されている。そして、上記吐出弁ホル
ダ１１の上部小径部１１ｂが、締付フランジ１３
の中央部に穿設された漏斗状の貫通孔１３ａに嵌
め込まれ、かつ吐出弁ホルダ１１の下部大径部１
１ａの上端の球面状に形成された肩部１１ｃが、
上記締付フランジ１３の貫通孔１３ａの下部の円
錘状凹面部１３ｂに密接した状態で、締付フラン
ジ１３に挿通した４本の固定ボルト１４をポンプ
外筒１０にねじ込むことにより、吐出弁ホルダ１
１がポンプ外筒１０に固定されている。また、上
記吐出弁ホルダ１１の内部に形成された燃料流路
１１ｄの先端には、先に行くほど径が広がる擂鉢
状の吐出口１１ｅが形成されており、この吐出口
１１ｅには、連結ブロツク１５のポンプ連結体１
５ａの先端に形成された球面凸部１５ｂが嵌め込
まれている。そして、このポンプ連結体１５ａの
中間部には、環状の突起部１５ｃが一体的に形成
されており、この突起部１５ｃと先端の球面凸部
１５ｂとの間において、ポンプ連結体１５ａの周
囲に、下部につば部１６ａを形成した筒状のシー
ト金具１６が嵌め込まれている。さらに、上記シ
ート金具１６と上記吐出弁ホルダ１１の上部小径
部１１ｂとの間には、該シート金具１６と吐出弁
ホルダ１１とを囲撓して連結フランジ１７が装着
されており、上記シート金具１６のつば部１６ａ
の球面状に形成された上端面１６ｂが、上記連結
フランジ１７の上側貫通孔１７ａの下部の円錐状
の凹面部１７ｂに密接した状態で、連結フランジ
１７に挿通した２本の締付ボルト１８を、締付フ
ランジ１３を介してポンプ外筒１０にねじ込むこ
とにより、連結ブロツク１５のポンプ連結体１５
ａが燃料噴射ポンプＡに固定されている。そし
て、上記連結フランジ１７と、吐出弁ホルダ１１
の上部小径部１１ｂ及びシート金具１６との間に
は、それぞれＯリング１９，２０が装着され、か
つ連結フランジ１７の内部には、上記吐出弁ホル
ダ１１とポンプ連結体１５ａとの連結部から漏洩
した燃料油を回収するためのドレン回収孔２１が
形成されている。 10 in the figure is a pump outer cylinder of the fuel injection pump A. Inside the pump outer cylinder 10, a lower large diameter portion 11a of a discharge valve holder 11 having a convex cross section is fitted, and this discharge valve An O-ring 12 is installed between the lower large diameter portion 11a of the holder 11 and the pump outer cylinder 10. The upper small diameter portion 11b of the discharge valve holder 11 is connected to the tightening flange 13.
The lower large diameter portion 1 of the discharge valve holder 11 is fitted into the funnel-shaped through hole 13a bored in the center of the discharge valve holder 11.
A shoulder portion 11c formed in a spherical shape at the upper end of 1a is
By screwing the four fixing bolts 14 inserted through the tightening flange 13 into the pump outer cylinder 10 in close contact with the conical concave portion 13b at the lower part of the through hole 13a of the tightening flange 13, the discharge valve holder can be attached. 1
1 is fixed to the pump outer cylinder 10. Further, a mortar-shaped discharge port 11e is formed at the tip of the fuel flow path 11d formed inside the discharge valve holder 11, and the diameter becomes larger toward the tip. 15 pump connections 1
A spherical convex portion 15b formed at the tip of 5a is fitted. An annular protrusion 15c is integrally formed in the intermediate portion of the pump coupling body 15a, and a ring-shaped protrusion 15c is formed around the pump coupling body 15a between the protrusion 15c and the spherical convex portion 15b at the tip. A cylindrical sheet metal fitting 16 having a flange 16a formed at its lower part is fitted. Further, a connecting flange 17 is installed between the seat metal fitting 16 and the upper small diameter portion 11b of the discharge valve holder 11, surrounding the sheet metal fitting 16 and the discharge valve holder 11. 16 brim portion 16a
The two tightening bolts 18 inserted into the connecting flange 17 are inserted into the connecting flange 17 with the spherical upper end surface 16b in close contact with the lower conical concave portion 17b of the upper through hole 17a of the connecting flange 17. , the pump coupling body 15 of the coupling block 15 is screwed into the pump outer cylinder 10 via the tightening flange 13.
a is fixed to fuel injection pump A. Then, the connection flange 17 and the discharge valve holder 11
O-rings 19 and 20 are installed between the upper small diameter portion 11b and the seat metal fitting 16, respectively, and there is no leakage inside the connection flange 17 from the connection between the discharge valve holder 11 and the pump connection body 15a. A drain recovery hole 21 is formed for recovering the fuel oil.
上記連結ブロツク１５は、ブロツク本体１５ｄ
の一端側に上記ポンプ連結体１５ａが一体的に連
結されて鉤状に形成されたもので、ブロツク本体
１５ｄの他端側には、締付フランジ部１５ｅが一
体的に形成されている。そして、ポンプ連結体１
５ａにその軸線に沿つて穿設された連結孔１５ｆ
と、上記ブロツク本体１５ｄに、その一端側から
軸線に沿つて穿設された流通孔１５ｇとが連通さ
れていると共に、該流通孔１５ｇの開口部はシー
ルプラグ２２によつて閉塞されている。また、上
記流通孔１５ｇの他端部には、漏斗状の連絡孔１
５ｈが形成されており、この連絡孔１５ｈの円錘
状の開口部（凹部）１５ｉには、内部に連通孔２
３ａを穿設した連結直管２３の一端の球面凸部２
３ｂが嵌め込まれている。そして、該連結直管２
３は、シリンダヘツド２４の端面２４ａに穿設さ
れた挿通孔２４ｂに遊嵌されていると共に、連結
直管２３の他端に形成された球面凸部２３ｃが、
シリンダヘツド２４に装着された噴射ノズルホル
ダ２５の凹部２５ａに、連結直管２３と噴射ノズ
ルホルダ２５とが直交した状態において、嵌め込
まれている。 The connecting block 15 has a block main body 15d.
The pump connecting body 15a is integrally connected to one end and formed into a hook shape, and the other end of the block main body 15d is integrally formed with a tightening flange portion 15e. And pump connection body 1
Connecting hole 15f bored in 5a along its axis
The block main body 15d communicates with a communication hole 15g formed along the axis from one end thereof, and the opening of the communication hole 15g is closed by a seal plug 22. Further, a funnel-shaped communication hole 1 is provided at the other end of the communication hole 15g.
5h is formed, and a conical opening (recess) 15i of this communication hole 15h has a communication hole 2 inside.
Spherical convex portion 2 at one end of the connecting straight pipe 23 with a hole 3a
3b is fitted. Then, the connecting straight pipe 2
3 is loosely fitted into an insertion hole 24b formed in an end surface 24a of the cylinder head 24, and a spherical convex portion 23c formed at the other end of the connecting straight pipe 23,
The connecting straight pipe 23 and the injection nozzle holder 25 are fitted into the recess 25a of the injection nozzle holder 25 mounted on the cylinder head 24 in a state where the connecting straight pipe 23 and the injection nozzle holder 25 are perpendicular to each other.
上記連結ブロツク１５の締付フランジ部１５ｅ
と連結直管２３との連結部において、断面凸字状
のカラー（シール部材）２６が、その一端側のつ
ば部２６ａと、上記シリンダヘツド２４の端面２
４ａとの間に所定の間隙ａを保持した状態で、締
付フランジ部１５ｅに、４本の取付ボルト２７に
よつて固定されている。そして、上記カラー２６
の他端側は、上記シリンダヘツド２４の挿通孔２
４ｂに嵌め込まれており、該カラー２６の内部に
形成された貫通孔２６ｂと、この貫通孔２６ｂに
挿通した上記連結直管２３との間には、所要の間
隙ｂが設定されている。また、締付フランジ部１
５ｅの開口部１５ｉの外周側には、凹部１５ｊが
形成されており、該凹所１５ｊと上記カラー２６
との間には、シールワツシヤ２８が装着されてい
ると共に、カラー２６とシリンダヘツド２４の挿
通孔２４ｂとの間には、Ｏリング２９が装着され
ている。そして、締付フランジ部１５ｅは、該締
付フランジ部１５ｅに挿通した２本の固定ボルト
３０により、シリンダヘツド２４に固定されてい
る。さらに、上記シリンダヘツド２４の挿通孔２
４ｂには、上記カラー２６の他端と、上記連結直
管２３に形成されたつば部２３ｄとの間におい
て、ドレン回収用の回収通路３１が連通されてい
る。 Tightening flange portion 15e of the connecting block 15
A collar (sealing member) 26 having a convex cross section is attached to the collar 26a on one end side and the end surface 2 of the cylinder head 24 at the connecting portion between the cylinder head 24 and the connecting straight pipe 23.
4a, and is fixed to the tightening flange portion 15e with four mounting bolts 27, with a predetermined gap a maintained therebetween. And the above color 26
The other end side is the insertion hole 2 of the cylinder head 24.
A required gap b is set between the through hole 26b formed inside the collar 26 and the connecting straight pipe 23 inserted into the through hole 26b. In addition, the tightening flange part 1
A recess 15j is formed on the outer circumferential side of the opening 15i of 5e, and the recess 15j and the collar 26
A seal washer 28 is installed between the collar 26 and the insertion hole 24b of the cylinder head 24, and an O-ring 29 is installed between the collar 26 and the insertion hole 24b of the cylinder head 24. The tightening flange portion 15e is fixed to the cylinder head 24 by two fixing bolts 30 inserted through the tightening flange portion 15e. Furthermore, the insertion hole 2 of the cylinder head 24 is
4b, a recovery passage 31 for drain recovery is communicated between the other end of the collar 26 and a collar portion 23d formed on the connecting straight pipe 23.
次に、上記燃料噴射ポンプＡの吐出弁ホルダ１
１と噴射ノズルホルダ２５とを連結ブロツク１５
及び連結直管２３を用いて連結する場合には、締
付フランジ１３及び固定ボルト１４によつてポン
プ外筒１０に取付けられた吐出弁ホルダ１１の吐
出口１１ｅに、連結ブロツク１５のポンプ連結体
１５ａの先端の球面凸部１５ｂを嵌め込み、かつ
ポンプ連結体１５ａに嵌め込まれたシート金具１
６と吐出弁ホルダ１１とを連結フランジ１７で囲
撓すると共に、連結フランジ１７の上側貫通孔１
７ａの円錐状凹面部１７ｂをシート金具１６のつ
ば部１６ａの球面状の上端面１６ｂに密接する一
方、連結直管２３の両端の球面凸部２３ｂ，２３
ｃを、それぞれ連結ブロツク１５の締付フランジ
部１５ｅの凹部１５ｉと、シリンダヘツド２４に
装着された噴射ノズルホルダ２５の凹部２５ａと
に嵌め込み、また、締付フランジ部１５ｅの凹部
１５ｉの外周側の凹所１５ｊとカラー２６との間
にシールワツシヤ２８を挟み込んで、カラー２６
のつば部２６ａを４本の取付ボルト２７により締
付フランジ部１５ｅに取付け、かつカラー２６の
内部に連結直管２３を遊嵌した状態で、該カラー
２６の他端側をシリンダヘツド２４の挿通孔２４
ｂに嵌め込んだ後、各締付ボルト１８及び固定ボ
ルト３０によつて、連結ブロツク１ごのポンプ連
結体１５ａを締付フランジ１３を介してポンプ外
筒１０に、かつ締付フランジ部１５ｅをシリンダ
ヘツド２４に強固に取付ければよい。この際、吐
出弁ホルダ１１の擂鉢状の吐出口１１ｅと連結ブ
ロツク１５のポンプ連結体１５ａの先端の球面凸
部１５ｂ、及びシート金具１６のつば部１６ａの
球面状の上端面１６ｂと連結フランジ１７の上側
貫通孔１７ａの下部の円錐状凹面部１７ｂとをそ
れぞれ利用して、連結ブロツク１５を、そのポン
プ連結体１５ａの先端を中心にして、水平方向及
び上下方向に適宜回動し、かつ連結ブロツク１５
の締付フランジ部１５ｅに取付けられたカラー２
６と、シリンダヘツド２４の端面２４ａ及び該カ
ラー２６に挿通した連結直管２３との間の各間隙
ａ，ｂと、連結直管２３の両端の球面凸部２３
ｂ，２３ｃと該各球面凸部２３ｂ，２３ｃを嵌め
込む締付フランジ部１５ｅの凹部１５ｉ及び噴射
ノズルホルダ２５の凹部２５ａとを利用して、連
結ブロツク１５、連結直管２３及び噴射ノズルホ
ルダ２５との間の三次元方向のずれを修正する。 Next, the discharge valve holder 1 of the fuel injection pump A
1 and the injection nozzle holder 25.
When connecting using the connecting straight pipe 23, the pump connecting body of the connecting block 15 is connected to the discharge port 11e of the discharge valve holder 11 attached to the pump outer cylinder 10 by the tightening flange 13 and fixing bolt 14. The sheet metal fitting 1 is fitted with the spherical convex portion 15b at the tip of the metal fitting 15a and is fitted into the pump coupling body 15a.
6 and the discharge valve holder 11 are surrounded by the connecting flange 17, and the upper through hole 1 of the connecting flange 17
The conical concave portion 17b of 7a is brought into close contact with the spherical upper end surface 16b of the collar portion 16a of the sheet metal fitting 16, while the spherical convex portions 23b, 23 at both ends of the connecting straight pipe 23
c into the recess 15i of the tightening flange 15e of the connecting block 15 and the recess 25a of the injection nozzle holder 25 attached to the cylinder head 24, and also fit the recess 15i of the tightening flange 15e into the recess 15i of the tightening flange 15e. The seal washer 28 is inserted between the recess 15j and the collar 26, and the collar 26
The collar portion 26a is attached to the tightening flange portion 15e with four mounting bolts 27, and the connecting straight pipe 23 is loosely fitted inside the collar 26, and the cylinder head 24 is inserted through the other end of the collar 26. Hole 24
b, then connect the pump connecting body 15a of each connecting block 1 to the pump outer cylinder 10 via the tightening flange 13 using the tightening bolts 18 and fixing bolts 30, and connect the tightening flange portion 15e to the pump outer cylinder 10. It is only necessary to firmly attach it to the cylinder head 24. At this time, the mortar-shaped discharge port 11e of the discharge valve holder 11, the spherical convex portion 15b at the tip of the pump connecting body 15a of the connecting block 15, the spherical upper end surface 16b of the collar portion 16a of the seat metal fitting 16, and the connecting flange 17 The connecting block 15 is appropriately rotated horizontally and vertically about the tip of the pump connecting body 15a by using the lower conical concave portion 17b of the upper through hole 17a, and is connected. Block 15
Collar 2 attached to the tightening flange portion 15e of
6, the gaps a and b between the end surface 24a of the cylinder head 24 and the connecting straight pipe 23 inserted through the collar 26, and the spherical convex portions 23 at both ends of the connecting straight pipe 23.
b, 23c, the recess 15i of the tightening flange 15e into which the respective spherical convex portions 23b, 23c are fitted, and the recess 25a of the injection nozzle holder 25 to connect the connecting block 15, the connecting straight pipe 23, and the injection nozzle holder 25. Correct the three-dimensional misalignment between
このようにして、連結ブロツク１５及び連結直
管２３によつて、燃料噴射ポンプＡと噴射ノズル
ホルダ２５とを連結すると、連結ブロツク１５の
ポンプ連結体１５ａの先端の球面凸部１５ｂ及び
締付フランジ部１５ｅの凹部１５ｉと、吐出弁ホ
ルダ１１の吐出口１１ｅと、連結直管２３の各球
面凸部２３ｂ，２３ｃと、噴射ノズルホルダ２５
の凹部２５ａとの間で、各部の製作時の誤差によ
る三次元方向のずれが吸収されるから、容易に取
付けられて、簡単に燃料噴射ポンプＡと噴射ノズ
ルホルダ２５とが連結される上に、取付不良によ
る燃料油洩れが生じることがない。また、連結ブ
ロツク１５及び連結直管２３は、特殊鋼材を穴加
工して使用できるから、従来、厚肉鋼管を用いた
場合に生じていた折損の問題が管内圧力1200Kg／
cm2以上の高圧の場合においても生じることがな
い。さらに、吐出弁ホルダ１１と連結ブロツク１
５のポンプ連結体１５ａとの連結部、及び連結直
管２３と、連結ブロツク１５及び噴射ノズルホル
ダ２５との連結部において、連結フランジ１７に
ドレン回収孔２１を設け、またシリンダヘツド２
４の挿通孔２４ｂに回収通路３１を連通したか
ら、各連結部から万一燃料油が漏洩しても、速や
かにかつ確実に回収され、外部に飛散することが
ない。 In this way, when the fuel injection pump A and the injection nozzle holder 25 are connected by the connecting block 15 and the connecting straight pipe 23, the spherical convex portion 15b and the tightening flange at the tip of the pump connecting body 15a of the connecting block 15 are connected. The concave portion 15i of the portion 15e, the discharge port 11e of the discharge valve holder 11, each spherical convex portion 23b, 23c of the connecting straight pipe 23, and the injection nozzle holder 25.
Since deviations in the three-dimensional direction due to manufacturing errors of each part are absorbed between the recess 25a and the recess 25a, the fuel injection pump A and the injection nozzle holder 25 can be easily connected. , fuel oil leakage due to poor installation will not occur. In addition, since the connecting block 15 and the connecting straight pipe 23 can be used by drilling special steel materials, the problem of breakage that conventionally occurred when thick-walled steel pipes are used is eliminated when the pipe internal pressure is 1200 kg/
It does not occur even at high pressures of cm 2 or higher. Furthermore, the discharge valve holder 11 and the connection block 1
A drain recovery hole 21 is provided in the connecting flange 17 at the connecting portion between the connecting straight pipe 23 and the connecting block 15 and the injection nozzle holder 25.
Since the recovery passage 31 communicates with the insertion hole 24b of No. 4, even if fuel oil were to leak from each connection, it would be quickly and reliably recovered and would not be scattered to the outside.
「考案の効果」
以上説明したように、本考案は、燃料噴射ポン
プと噴射ノズルホルダとを、連結ブロツク及び連
結直管を介して連結する燃料高圧管の連結構造に
おいて、上記連結直管が、シリンダヘツドの端面
に穿設された挿入孔に遊篏され、かつ上記連結直
管の両端に各々形成された球面凸部が、上記噴射
ノズルホルダに形成された凹部と、上記連結ブロ
ツクに形成された凹部とにそれぞれ嵌め込まれる
と共に、上記連結ブロツクがシリンダヘツドに固
定されることにより、上記連結直管が連結ブロツ
クと噴射ノズルホルダとの間に挟持され、上記連
結ブロツクとシリンダヘツドとの連結部にシール
部材が装着され、該シール部材は、上記連結直管
がその径方向に所要間隔をおいて遊篏されている
と共に、上記シリンダヘツドに気密にかつ摺動可
能に嵌め込まれ、また、一端部において上記連結
ブロツクへ気密状態で連結されていることを特徴
とするもので、連結直管の両端の球面凸部と、噴
射ノズルホルダ及び連結ブロツクの各凹部と、シ
ール部材の一端とシリンダヘツド端面との間の間
隙及びシール部材と連結直管との間の間隙とによ
つて、連結ブロツク、連結直管及び噴射ノズルホ
ルダの間の三次元方向のずれを吸収して、連結ブ
ロツクと連結直管と噴射ノズルホルダとを強固に
連結することができ、取付け易く、取付不良に伴
う燃料油の洩れを防止できる。また、連結ブロツ
ク及び連結直管により燃料噴射ポンプと噴射ノズ
ルホルダとを連結することによつて、従来厚肉鋼
管を用いた場合に管内圧力が高く（1200Kg／cm2）
となると折損していたのに比べ、耐圧を高くで
き、圧力が1500Kg／cm2程度でも破損することがな
い等優れた効果を有する。"Effects of the Invention" As explained above, the present invention provides a fuel high-pressure pipe connection structure that connects a fuel injection pump and an injection nozzle holder via a connection block and a connection straight pipe, in which the connection straight pipe has the following features: A spherical convex portion loosely inserted into an insertion hole drilled in the end face of the cylinder head and formed at each end of the connecting straight pipe is formed in a recess formed in the injection nozzle holder and in the connecting block. At the same time, the connecting block is fixed to the cylinder head, so that the connecting straight pipe is held between the connecting block and the injection nozzle holder, and the connecting part between the connecting block and the cylinder head is held between the connecting block and the injection nozzle holder. A sealing member is attached to the cylinder head, and the sealing member is fitted in the cylinder head airtightly and slidably, and the connecting straight pipe is loosely connected to the cylinder head at a required interval in the radial direction. It is characterized in that it is connected to the connecting block in an airtight state at the connecting straight pipe, the spherical convex portions at both ends of the connecting straight pipe, the recessed portions of the injection nozzle holder and the connecting block, one end of the sealing member, and the cylinder head. The gap between the end face and the gap between the seal member and the connecting straight pipe absorbs the three-dimensional misalignment between the connecting block, the connecting straight pipe, and the injection nozzle holder, and connects the connecting block. The straight pipe and the injection nozzle holder can be firmly connected, easy to install, and leakage of fuel oil due to poor installation can be prevented. In addition, by connecting the fuel injection pump and the injection nozzle holder using a connecting block and a connecting straight pipe, the pressure inside the pipe can be increased (1200 kg/cm 2 ) compared to conventional thick-walled steel pipes.
Compared to other cases where it would break, it has superior effects such as higher pressure resistance and no breakage even at pressures of around 1500 kg/cm 2 .
第１図ないし第４図は本考案の一実施例を示す
もので、第１図は一部を断面視した側面図、第２
図はシリンダヘツド部の断面図、第３図は第１図
の−線に沿う断面図、第４図は連結ブロツク
と連結直管との連結部の説明図、第５図と第６図
は従来の連結状態を示すもので、第５図は側面
図、第６図は断面図である。
Ａ……燃料噴射ポンプ、ａ，ｂ……間隙、１５
……連結ブロツク、２３……連結直管、２４……
シリンダヘツド、２５……噴射ノズルホルダ、２
６……カラー（シール部材）、１５ｉ……開口部
（凹部）、２３ｂ，２３ｃ……球面凸部、２４ａ…
…端面、２４ｂ……挿通孔、２５ａ……凹部。
Figures 1 to 4 show one embodiment of the present invention, with Figure 1 being a partially sectional side view and Figure 2 being a partially sectional side view.
The figure is a sectional view of the cylinder head, FIG. 3 is a sectional view taken along the - line in FIG. 5 is a side view and FIG. 6 is a sectional view, showing a conventional connected state. A... Fuel injection pump, a, b... Gap, 15
... Connection block, 23 ... Connection straight pipe, 24 ...
Cylinder head, 25...Injection nozzle holder, 2
6... Collar (sealing member), 15i... Opening (recess), 23b, 23c... Spherical convex portion, 24a...
... end face, 24b ... insertion hole, 25a ... recess.
Claims (1)
ブロツク及び連結直管を介して連結する燃料高圧
管の連結構造において、上記連結直管が、シリン
ダヘツドの端面に穿設された挿入孔に遊篏され、
かつ上記連結直管の両端に各々形成された球面凸
部が、上記噴射ノズルホルダに形成された凹部
と、上記連結ブロツクに形成された凹部とにそれ
ぞれ嵌め込まれると共に、上記連結ブロツクがシ
リンダヘツドに固定されることにより、上記連結
直管が連結ブロツクと噴射ノズルホルダとの間に
挟持され、上記連結ブロツクとシリンダヘツドと
の連結部にシール部材が装着され、該シール部材
は、上記連結直管がその径方向に所要間隔をおい
て遊篏されていると共に、上記シリンダヘツドに
気密にかつ摺動可能に嵌め込まれ、また、一端部
において上記連結ブロツクへ気密状態で連結され
ていることを特徴とする燃料高圧管の連結構造。 In a fuel high pressure pipe connection structure that connects a fuel injection pump and an injection nozzle holder via a connection block and a connection straight pipe, the connection straight pipe is loosely inserted into an insertion hole bored in an end face of a cylinder head. ,
The spherical convex portions formed at both ends of the connecting straight pipe are respectively fitted into the recess formed in the injection nozzle holder and the recess formed in the connecting block, and the connecting block is fitted into the cylinder head. By being fixed, the connecting straight pipe is held between the connecting block and the injection nozzle holder, and a sealing member is attached to the connecting portion between the connecting block and the cylinder head, and the sealing member is attached to the connecting straight pipe. are loosely spaced at a required interval in the radial direction, are hermetically and slidably fitted into the cylinder head, and are hermetically connected to the connection block at one end. A connection structure for high-pressure fuel pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985098975U JPH0421003Y2 (en) | 1985-06-28 | 1985-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985098975U JPH0421003Y2 (en) | 1985-06-28 | 1985-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS628367U JPS628367U (en) | 1987-01-19 |
| JPH0421003Y2 true JPH0421003Y2 (en) | 1992-05-13 |
Family
ID=30967430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985098975U Expired JPH0421003Y2 (en) | 1985-06-28 | 1985-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0421003Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2581047Y2 (en) * | 1992-01-07 | 1998-09-17 | ダイハツディーゼル株式会社 | Fuel high-pressure pipe mounting structure |
| DE102011002996A1 (en) * | 2011-01-21 | 2012-07-26 | Robert Bosch Gmbh | Fuel injector with improved high pressure connection |
| DE102013200909A1 (en) * | 2013-01-22 | 2014-07-24 | Robert Bosch Gmbh | Fuel injection system with a fuel-carrying component, a fuel injection valve and a connecting element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58210359A (en) * | 1982-06-01 | 1983-12-07 | Yanmar Diesel Engine Co Ltd | Connecting structure of high-pressure fuel pipe for fuel injection valve |
| JPS59133775U (en) * | 1983-02-28 | 1984-09-07 | 株式会社小松製作所 | Fuel injection device nozzle holder device |
-
1985
- 1985-06-28 JP JP1985098975U patent/JPH0421003Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS628367U (en) | 1987-01-19 |
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