JP4036412B2 - High pressure fuel injection pipe for diesel engine - Google Patents

High pressure fuel injection pipe for diesel engine Download PDF

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Publication number
JP4036412B2
JP4036412B2 JP13437199A JP13437199A JP4036412B2 JP 4036412 B2 JP4036412 B2 JP 4036412B2 JP 13437199 A JP13437199 A JP 13437199A JP 13437199 A JP13437199 A JP 13437199A JP 4036412 B2 JP4036412 B2 JP 4036412B2
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Prior art keywords
injection pipe
tightening nut
nut
fuel
seat surface
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JP13437199A
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JP2000320426A (en
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信夫 加藤
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Usui Co Ltd
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Usui Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/002—Arrangement of leakage or drain conduits in or from injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2201/00—Special arrangements for pipe couplings
    • F16L2201/30—Detecting leaks

Description

【０００１】
【発明の属する技術分野】
本発明は特にディーゼル機関にあって、燃料の供給路として該機関の近くに配設される管径３０ｍ／ｍ程度以下の比較的細径からなるディーゼル機関用高圧燃料噴射管に関するものである。
【０００２】
【従来の技術】
一般にディーゼル機関用高圧燃料噴射管としては、燃料の機関外部への飛散、洩れの完全防止対策をはかるため、従来、例えば図５、図６に示すように、噴射管本体１１の外周側にその相対する端面が間隔１４を保持して軸方向に移動可能に被着重合した別体からなるそれぞれの外管１２−１、１２−２間に跨設される連結筒体１３を、前記相互の外管１２−１、１２−２のなす内側端部付近にシール部材１５を介在させてその両端部をいずれも加熱溶着Ｗ−１、Ｗ−２して二重壁に構成され、かつ噴射管本体１１の両端部には接続頭部１１−１、１１−２の背後にスリーブ１３−１ａ、１３−２ａを介在して接続時の締付けナット１３−１、１３−２が組込まれ、この締付けナット１３−１、１３−２にシール部材１６を介して外管１２−１、１２−２の端部が係合された構造となっている。しかしながらこのような構成の噴射管においては、噴射管本体１１上にそれぞれの外管１２−１、１２−２を被着重合した定位置の組付けた状態で、前記連結筒体１３を跨設してその両端部と外管１２−１、１２−２側とをろう付けまたは溶接などの加熱溶着Ｗ−１、Ｗ−２するため、加熱溶着部付近に位置する噴射管本体１１側に加熱による機械的強度の劣化や外管１２−１、１２−２の耐食表面処理被膜の熱損による耐食性の低下を招く。そしてこのような機械的強度の劣化と配設使用時の機関からの加振に起因して長期使用後に周壁面に亀裂を生ぜしめて燃料の外部への噴霧状の飛散、洩れを誘発する可能性があった。そこで燃料の外部への噴霧状の飛散、洩れの防止対策の１つとして、図６に示すごとく締付けナット１３−２にドレイン孔１７を設け、噴射管本体１１から洩れた燃料を前記ドレイン孔１７より回収する方法がとられている。１９は前記ドレイン孔１７に連通するドレイン１９−１を有する燃料回収用リテーナであり、締付けナット１３−２にシーリング部材２０を介して外嵌され、かつ抜け止め用リング２１にて固定されている。
【０００３】
【発明が解決しようとする課題】
しかしながらこのような従来の燃料回収方法では、噴射管本体１１の接続頭部１１−１、１１−２の押圧座面１１−１ａ、１１−２ａと相手側部材１８の受圧座面１８−１とのシート面から締付けナット１３−１、１３−２内部に洩れた燃料など、噴射管本体１１の接続頭部１１−１、１１−２の外側の相手部材１８との間に洩れた燃料の回収が不可能であり、またこの洩れた燃料が締付けナット１３−１、１３−２と相手部材１８との螺合部より外部へ洩れることがあり、その一層の安全対策が望まれる現状にある。
【０００４】
本発明は従来技術の有する前記問題点に鑑みてなされたものであり、噴射管本体やシート部より万一燃料が洩れた場合でも、洩れた燃料が外部に洩れることなく回収できて、火災対策を一層確実となして長期耐用することができる極めて安全性の高いディーゼル機関用高圧燃料噴射管を提供しようとするものである。
【０００５】
【課題を解決するための手段】
本発明は上記課題を解決するため、噴射管本体部で万一燃料が洩れた場合でも、洩れた燃料と接続頭部のなす押圧座面部と相手部材の受圧座面部とのシート部で洩れた燃料を共に同じドレインより回収できるように構成するとともに、それらの燃料が締付けナットと相手部材との螺合部から外部に洩れないようにシール手段をこうじたもので、その第１の実施態様は両側端部に接続頭部と該接続頭部の背後に締付けナットを組込んだ噴射管本体の外周側にそれぞれ別体からなる外管を被着重合し、かつ前記外管の両外側端部付近をシール部材を介在して前記締付けナットと係合せしめて構成し、前記接続頭部のなす押圧座面部を相手部材の受圧座面部に当接係合せしめ、前記締付けナットの螺合による前記接続頭部での押圧に伴って締着して相手部材を接続する構造となした高圧燃料噴射管において、前記噴射管本体の接続頭部と締付けナットとの間に、円周上に少なくとも１個の細孔を放射状に設けた環状のワッシャーを嵌合し、さらに前記締付けナットの前記ワッシャーと相手部材との間にドレイン孔を穿設し、前記ワッシャーの細孔より締付けナット内部に流入した燃料または前記接続頭部のなす押圧座面部と相手部材の受圧座面部とのシート部より締付けナット内部に洩れた燃料を前記締付けナットのドレイン孔より回収する構造となしたディーゼル機関用高圧燃料噴射管を要旨とするものである。
また第２の実施態様は両側端部に接続端部と該接続端部の背後に締付けナットを組込んだ噴射管本体の外周側に、それぞれ別体からなる外管を被着重合し、かつ前記外管の両外側端部付近をシール部材を介在して前記締付けナットと係合せしめて構成し、前記接続端部のなす押圧座面部を相手部材の受圧座面部に当接係合せしめ、前記締付けナットの螺合による前記接続端部での押圧に伴って締着して相手部材を接続する構造となした高圧燃料噴射管において、前記噴射管本体の接続端部と締付けナットとの間に、円周上に少なくとも１つの切込みを放射状に設けた筒状のねじ込み式スリーブを該噴射管本体の接続端部に螺着し、さらに前記締付けナットの前記スリーブと相手部材との間にドレイン孔を穿設し、前記ねじ込み式スリーブの切込みより締付けナット内部に流入した燃料または前記接続端部のなす押圧座面部と相手部材の受圧座面部とのシート部より締付けナット内部に洩れた燃料を前記締付けナットのドレイン孔より回収する構造となしたディーゼル機関用高圧燃料噴射管を要旨とするものである。
また上記第１、第２のディーゼル機関用高圧燃料噴射管において、締付けナットと相手部材との螺合部外側端部付近にシール部材を配したりするものである。
【０００６】
本発明に係るディーゼル機関用高圧燃料噴射管は、噴射管本体の接続頭部と締付けナットとの間に１個、好ましくは複数個の細孔を有する環状のワッシャーを、または噴射管本体の接続端部と締付けナットとの間に１つ、好ましくは複数の切込み付きねじ込み式スリーブをそれぞれ設けたことにより、万一燃料が噴射管本体より洩れた場合でも、洩れた燃料は前記環状のワッシャーの円周上に放射状に設けた複数個の細孔、またはねじ込み式スリーブの円周上に放射状に設けた複数の切込みから締付けナット内側に導かれる。そしてシート部より洩れた燃料と共に、締付けナットに設けたドレイン孔より回収することができる。また締付けナットと相手部材との螺合部外側端部付近にシール部材を配することにより、締付けナット内側に導かれた燃料が締付けナットと相手部材との螺合部より外部に洩れることはない。したがってこのディーゼル機関用高圧燃料噴射管は、火災対策を一層確実となした極めて安全性の高いものである。
【０００７】
【発明の実施の形態】
図１は本発明に係るディーゼル機関用高圧燃料噴射管の一実施例の要部を拡大して示す縦断面図、図２は図１に示す燃料噴射管におけるワッシャーを示す正面図、図３は同じく本発明に係るディーゼル機関用高圧燃料噴射管の他の一実施例の要部を拡大して示す縦断面図、図４は図３に示す燃料噴射管におけるねじ込み式スリーブを示す正面図であり、１は噴射管本体、１−１は接続頭部、２は外管、３は締付けナット、４ａ、４ｂ、４ｃはシール部材、５は環状のワッシャー、６はねじ込み式スリーブ、７は燃料回収用リテーナ、８は相手部材、９はシート部、１０は抜け止め用リングである。
【０００８】
まず図１に示すディーゼル機関用高圧燃料噴射管は、両側端部に成形した接続頭部１−１側に締付けナット３が組込まれた噴射管本体１の外周側に別体からなる外管２が被着重合されており、かつ前記外管２の両外側端部付近をシール部材４ａを介在して前記締付けナット３と係合せしめ、前記接続頭部１−１のなす押圧座面部１−１ａを相手部材８の受圧座面部８−１に当接係合せしめてシート部９を構成し、前記締付けナット３の螺合による前記接続頭部１−１での押圧に伴って締着して相手部材８を接続する構造において、前記接続頭部１−１と締付けナット３との間に、円周上に複数個の細孔５−１が放射状に設けられた環状のワッシャー５を介在させている。そして前記締付けナット３の前記環状のワッシャー５と前記シート部９間にドレイン孔３−１を穿設し、このドレイン孔３−１を囲繞するように燃料回収用リテーナ７を締付けナット３の外周にシール部材４ｂを介して外嵌し、抜け止め用リング１０にて固定している。前記ドレイン孔３−１は締付けナット３の円周上に複数個設けられており、一方燃料回収用リテーナ７側にはその内周面に前記ドレイン孔３−１を囲むように円周溝７−１が設けられ、この円周溝７−１上に前記ドレイン孔３−１と連通する通孔７−２が穿設されている。締付けナット３と相手部材８との螺合部外側端部付近にはシール部材４ｃを配している。
【０００９】
上記構成のディーゼル機関用高圧燃料噴射管において、噴射管本体１の機械的強度の劣化や配設使用時の機関からの加振などに起因して万一周壁面に亀裂が生じて該噴射管本体１から燃料が洩れた場合、その洩れた燃料は外管２と噴射管本体１との間を通り環状のワッシャー５側へ流れる。ワッシャー５の付近まで流れてきた燃料がこのワッシャー５と噴射管本体１との隙間に侵入すると当該ワッシャー５に放射状に設けられている細孔５−１を通って締付けナット３の内側へ流入し、当該締付けナット３に設けられているドレイン孔３−１より燃料回収用リテーナ７の円周溝７−１および通孔７−２より外部に回収されることとなる。また締付けナット３の締付けトルク不足などにより万一燃料がシート部９より洩れて締付けナット３の内側へ流入した場合も前記と共通のドレイン孔３−１より燃料回収用リテーナ７の円周溝７−１および通孔７−２より外部に回収されるととなる。なお締付けナット３と相手部材８との螺合部外側端部付近にシール部材４ｃを配しているので、締付けナット３の内側へ流入した燃料が締付けナット３と相手部材８との螺合部より外部へ洩れることはない。
【００１０】
つぎに図３に示すディーゼル機関用高圧燃料噴射管は、前記した図１、図２に示す環状のワッシャー５に替えて、円周上に複数の切込み６−１を放射状に設けた筒状のねじ込み式スリーブ６を噴射管本体１の接続端部に螺合し、その先端部を締付けナット３の内周面に圧着させたものである。すなわちこの噴射管の場合は、締付けナット３の内部に外方へ開口する受圧面３ａを形成し、この受圧面３ａに当接係合する押圧面６ａおよび該押圧面６ａ部の円周上に放射状に設けた複数の切込み６−１を有するねじ込み式スリーブ６を噴射管本体１の接続端部に設けたねじ部１−２に螺合し、該押圧面６ａを締付けナット３側の受圧面３ａに圧着して構成したものである。すなわちこの燃料噴射管の場合は、噴射管本体１から洩れて筒状のねじ込み式スリーブ６まで流れてきた燃料を当該スリーブ６の切込み６−１より締付けナット３の内側へ導く構造となしたものである。
【００１１】
上記図３に示す構成のディーゼル機関用高圧燃料噴射管において、噴射管本体１の機械的強度の劣化や配設使用時の機関からの加振などに起因して万一周壁面に亀裂が生じて該噴射管本体１から燃料が洩れた場合、その洩れた燃料は前記図１に示す噴射管と同様外管２と噴射管本体１との間を通り筒状のねじ込み式スリーブ６側へ流れる。そしてねじ込み式スリーブ６の付近まで流れてきた燃料はこのスリーブ６の切込み６−１を通って締付けナット３の内側へ流入し、当該締付けナット３に設けられているドレイン孔３−１より燃料回収用リテーナ７の円周溝７−１および通孔７−２より外部に回収されることとなる。またこの燃料噴射管の場合も、締付けナット３の締付けトルク不足などにより万一燃料がシート部９より洩れて締付けナット３の内側へ流入した場合は、前記噴射管本体１側から洩れてきた燃料と同様に、ドレイン孔３−１より燃料回収用リテーナ７の円周溝７−１および通孔７−２より外部に回収される。なお締付けナット３と相手部材８との螺合部外側端部付近にシール部材４ｃを配しているので、締付けナット３の内側へ流入した燃料が締付けナット３と相手部材８との螺合部より外部へ洩れることはない。
【００１２】
【発明の効果】
以上説明したごとく本発明によるディーゼル機関用高圧燃料噴射管は、噴射管本体の接続頭部の部分に配設した環状のワッシャーまたはねじ込み式スリーブによって噴射管本体あるいはシート部より万一燃料が洩れた場合でも、洩れた燃料を外部に回収することができ、またまた締付けナットと相手部材との螺合部外側端部付近にシール部材を配することにより、締付けナット内側に導かれた燃料が締付けナットと相手部材との螺合部より外部に洩れることもなくなるので、漏洩燃料による火災の危険性は全くなく極めて安全性に富むものである。
【図面の簡単な説明】
【図１】本発明に係るディーゼル機関用高圧燃料噴射管の一実施例の要部を拡大して示す縦断面図である。
【図２】図１に示す燃料噴射管におけるワッシャーを示す正面図である。
【図３】同じく本発明に係るディーゼル機関用高圧燃料噴射管の他の一実施例の要部を拡大して示す縦断面図である。
【図４】図３に示す燃料噴射管におけるねじ込み式スリーブを示す正面図である。
【図５】本発明の対象とする従来のディーゼル機関用高圧燃料噴射管を一部省略して示す縦断面図である。
【図６】図５に示すディーゼル機関用高圧燃料噴射管の要部を拡大して示す縦断面図である。
【符号の説明】
１ 噴射管本体
１−１ 接続頭部
２ 外管
３ 締付けナット
３−１ ドレイン孔
４ａ、４ｂ、４ｃ シール部材
５ 環状のワッシャー
６ ねじ込み式スリーブ
７ 燃料回収用リテーナ
７−２ ドレイン孔
８ 相手部材
９ シート部
１０ 抜け止め用リング[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to a high-pressure fuel injection pipe for a diesel engine having a relatively small diameter of about 30 m / m or less disposed as a fuel supply passage in the vicinity of the engine in a diesel engine.
[0002]
[Prior art]
In general, as a high pressure fuel injection pipe for a diesel engine, in order to take measures for completely preventing the scattering and leakage of fuel to the outside of the engine, conventionally, for example, as shown in FIGS. The connecting cylinders 13 straddling between the outer pipes 12-1 and 12-2 made of differently attached and polymerized so as to be movable in the axial direction while maintaining the interval 14 between the end pipes, A seal member 15 is interposed in the vicinity of the inner end formed by the outer tubes 12-1 and 12-2, and both ends thereof are heated and welded W-1 and W-2 to form a double wall, and the injection tube Clamping nuts 13-1 and 13-2 at the time of connection are assembled at both ends of the main body 11 via sleeves 13-1a and 13-2a behind the connection heads 11-1 and 11-2. The outer tube 12-is connected to the nuts 13-1 and 13-2 via the seal member 16. , The end of 12-2 is in the engaged configuration. However, in the injection pipe having such a configuration, the connecting cylinder 13 is stretched in a state where the outer pipes 12-1 and 12-2 are attached and polymerized on the injection pipe main body 11 in a fixed position. Then, in order to heat-weld W-1 and W-2 such as brazing or welding between the both ends and the outer pipes 12-1 and 12-2 side, heat is applied to the injection pipe main body 11 side located near the heat-welded part. Deterioration of the mechanical strength due to corrosion and a decrease in corrosion resistance due to heat loss of the corrosion-resistant surface treatment coatings of the outer tubes 12-1 and 12-2. And due to such deterioration of mechanical strength and vibration from the engine during use, there is a possibility of causing cracks in the peripheral wall surface after long-term use and inducing spray-like scattering and leakage of fuel to the outside. was there. Therefore, as one of the measures for preventing the spray of fuel from splashing and leaking, a drain hole 17 is provided in the tightening nut 13-2 as shown in FIG. More recovery methods are used. Reference numeral 19 denotes a fuel recovery retainer having a drain 19-1 communicating with the drain hole 17. The fuel recovery retainer 19 is externally fitted to a tightening nut 13-2 via a sealing member 20 and fixed by a retaining ring 21. .
[0003]
[Problems to be solved by the invention]
However, in such a conventional fuel recovery method, the pressing head surfaces 11-1a and 11-2a of the connection head portions 11-1 and 11-2 of the injection pipe main body 11 and the pressure receiving seat surface 18-1 of the counterpart member 18 Of fuel leaking between the mating member 18 outside the connection heads 11-1 and 11-2 of the injection pipe body 11, such as fuel leaking from the seat surface into the tightening nuts 13-1 and 13-2 The leaked fuel may leak to the outside from the screwed portion between the tightening nuts 13-1 and 13-2 and the mating member 18, and further safety measures are desired.
[0004]
The present invention has been made in view of the above-mentioned problems of the prior art, and even if fuel leaks from the injection pipe main body or the seat portion, the leaked fuel can be recovered without leaking to the outside, and measures against fire It is an object of the present invention to provide a high-safety high-pressure fuel injection pipe for a diesel engine that can be used for a long period of time.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention leaks at the seat portion between the leaked fuel, the pressure seat surface portion formed by the connecting head and the pressure receiving seat surface portion of the mating member, even if the fuel leaks in the injection pipe main body portion. The fuel can be recovered from the same drain, and the sealing means is used to prevent the fuel from leaking outside from the screwed portion between the clamping nut and the mating member. A separate outer pipe is deposited on the outer peripheral side of the injection pipe main body incorporating a connecting head at both ends and a tightening nut behind the connecting head, and both outer ends of the outer pipe The vicinity is configured to be engaged with the tightening nut via a seal member, the pressing seat surface portion formed by the connection head is brought into contact with and engaged with the pressure receiving seat surface portion of the mating member, and the connection by screwing the tightening nut is performed. Fasten with the pressure on the head In the high-pressure fuel injection pipe having a structure for connecting a hand member, an annular washer provided with at least one fine hole radially on the circumference between the connection head of the injection pipe main body and the tightening nut. Further, a drain hole is formed between the washer and the mating member of the tightening nut, and the fuel or the pressure seat surface portion formed by the connecting head formed by the fuel flowing into the tightening nut from the narrow hole of the washer. The gist of the present invention is a high-pressure fuel injection pipe for a diesel engine having a structure in which fuel leaked into the tightening nut from the seat portion with the pressure-receiving seat surface portion of the member is recovered from the drain hole of the tightening nut.
In the second embodiment, a separate outer pipe is attached and polymerized on the outer peripheral side of the injection pipe main body in which a connection end is attached to both side ends and a tightening nut is installed behind the connection end, and The outer tube is configured so that the vicinity of both outer ends of the outer tube is engaged with the tightening nut via a seal member, the pressing seat surface portion formed by the connecting end portion is brought into contact with and engaged with the pressure receiving seat surface portion of the mating member, In the high pressure fuel injection pipe structured to be connected with the mating member by being pressed with the connection end by the screwing of the tightening nut, between the connection end of the injection pipe main body and the tightening nut. A cylindrical screw-type sleeve provided with at least one notch radially on the circumference is screwed to the connection end of the injection pipe body, and a drain hole is formed between the sleeve of the tightening nut and the mating member. And cut the screw-in sleeve A structure in which fuel that has flowed into the tightening nut or fuel leaked into the tightening nut from the seat portion of the pressing seat surface portion formed by the connecting end and the pressure-receiving seat surface portion of the mating member is collected from the drain hole of the tightening nut; The gist of the high-pressure fuel injection pipe for diesel engines.
In the first and second high-pressure fuel injection pipes for diesel engines, a seal member is arranged in the vicinity of the outer end of the screwed portion between the tightening nut and the counterpart member.
[0006]
The high-pressure fuel injection pipe for a diesel engine according to the present invention includes one annular washer having a plurality of pores between the connection head of the injection pipe body and the tightening nut, or the connection of the injection pipe body. By providing one, preferably a plurality of threaded sleeves with notches, between the end and the clamping nut, even if the fuel leaks from the injection pipe body, the leaked fuel will be removed from the annular washer. A plurality of fine holes provided radially on the circumference or a plurality of notches provided radially on the circumference of the screw-in sleeve are guided to the inside of the tightening nut. And it can collect | recover from the drain hole provided in the clamping nut with the fuel which leaked from the seat part. Further, by arranging the seal member near the outer end of the screwed portion between the tightening nut and the mating member, the fuel guided to the inner side of the tightening nut does not leak outside from the screwed portion between the tightening nut and the mating member. . Therefore, the high-pressure fuel injection pipe for diesel engines is extremely safe with fire countermeasures being further ensured.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal sectional view showing an enlarged main part of an embodiment of a high-pressure fuel injection pipe for a diesel engine according to the present invention, FIG. 2 is a front view showing a washer in the fuel injection pipe shown in FIG. FIG. 4 is a longitudinal sectional view showing an enlarged main part of another embodiment of the high-pressure fuel injection pipe for a diesel engine according to the present invention, and FIG. 4 is a front view showing a screw-type sleeve in the fuel injection pipe shown in FIG. 1 is an injection pipe body, 1-1 is a connection head, 2 is an outer pipe, 3 is a tightening nut, 4a, 4b and 4c are seal members, 5 is an annular washer, 6 is a screw-in sleeve, and 7 is a fuel recovery The retainer 8 is a mating member, 9 is a seat portion, and 10 is a retaining ring.
[0008]
First, a high-pressure fuel injection pipe for a diesel engine shown in FIG. 1 is a separate outer pipe 2 on the outer peripheral side of an injection pipe main body 1 in which a tightening nut 3 is incorporated on the side of a connection head 1-1 formed at both end portions. The outer peripheral end portions of the outer tube 2 are engaged with the tightening nut 3 with a seal member 4a interposed therebetween, so that the pressing seat surface portion 1- formed by the connection head 1-1 is formed. 1a is abutted and engaged with the pressure-receiving seat surface portion 8-1 of the mating member 8 to form the seat portion 9, which is fastened together with the pressing at the connection head 1-1 by the screwing of the tightening nut 3. In the structure for connecting the mating member 8, an annular washer 5 in which a plurality of pores 5-1 are radially provided on the circumference is interposed between the connection head 1-1 and the tightening nut 3. ing. Then, a drain hole 3-1 is formed between the annular washer 5 of the tightening nut 3 and the seat portion 9, and the fuel recovery retainer 7 is attached to the outer periphery of the tightening nut 3 so as to surround the drain hole 3-1. And is fixed by a retaining ring 10. A plurality of the drain holes 3-1 are provided on the circumference of the tightening nut 3. On the other hand, on the fuel recovery retainer 7 side, a circumferential groove 7 is formed so as to surround the drain hole 3-1 on the inner circumferential surface thereof. -1 is provided, and a through hole 7-2 communicating with the drain hole 3-1 is formed on the circumferential groove 7-1. A seal member 4c is disposed in the vicinity of the outer end of the screwed portion between the tightening nut 3 and the mating member 8.
[0009]
In the high-pressure fuel injection pipe for a diesel engine having the above configuration, the injection pipe body 1 is cracked in the peripheral wall surface due to deterioration of mechanical strength of the injection pipe main body 1 or vibration from the engine during installation and use. When fuel leaks from the main body 1, the leaked fuel passes between the outer pipe 2 and the injection pipe main body 1 and flows to the annular washer 5 side. When the fuel that has flowed to the vicinity of the washer 5 enters the gap between the washer 5 and the injection pipe main body 1, the fuel flows into the inside of the tightening nut 3 through the pores 5-1 radially provided in the washer 5. Thus, the fuel is recovered from the drain hole 3-1 provided in the tightening nut 3 to the outside through the circumferential groove 7-1 and the through hole 7-2 of the fuel recovery retainer 7. Even if fuel leaks from the seat portion 9 and flows into the inside of the tightening nut 3 due to insufficient tightening torque of the tightening nut 3, the circumferential groove 7 of the fuel recovery retainer 7 from the common drain hole 3-1. -1 and through-hole 7-2. Since the seal member 4c is disposed in the vicinity of the outer end of the screwed portion between the tightening nut 3 and the mating member 8, the fuel flowing into the inner side of the tightening nut 3 is the screwed portion between the tightening nut 3 and the mating member 8. There is no leakage outside.
[0010]
Next, the high-pressure fuel injection pipe for a diesel engine shown in FIG. 3 has a cylindrical shape in which a plurality of cuts 6-1 are provided radially on the circumference instead of the annular washer 5 shown in FIGS. The screwed sleeve 6 is screwed into the connection end portion of the injection tube main body 1, and the tip end portion is crimped to the inner peripheral surface of the tightening nut 3. That is, in the case of this injection pipe, the pressure receiving surface 3a that opens outward is formed inside the tightening nut 3, and the pressure surface 6a that contacts and engages the pressure receiving surface 3a and the circumference of the pressure surface 6a portion. A screw-in sleeve 6 having a plurality of radially provided cuts 6-1 is screwed into a screw part 1-2 provided at a connection end of the injection pipe body 1, and the pressing surface 6a is a pressure-receiving surface on the side of the tightening nut 3. It is configured by pressing to 3a. That is, in the case of this fuel injection pipe, the fuel that has leaked from the injection pipe main body 1 and has flowed to the cylindrical screwed sleeve 6 is guided to the inside of the tightening nut 3 from the notch 6-1 of the sleeve 6. It is.
[0011]
In the high-pressure fuel injection pipe for a diesel engine having the configuration shown in FIG. 3, the peripheral wall surface is cracked due to deterioration of the mechanical strength of the injection pipe body 1 or vibration from the engine during use. When the fuel leaks from the injection pipe main body 1, the leaked fuel passes between the outer pipe 2 and the injection pipe main body 1 as in the injection pipe shown in FIG. . The fuel that has flowed to the vicinity of the screw-in sleeve 6 flows into the inside of the tightening nut 3 through the notch 6-1 of the sleeve 6 and recovers the fuel from the drain hole 3-1 provided in the tightening nut 3. From the circumferential groove 7-1 and the through-hole 7-2 of the retainer 7 for use, it will be collect | recovered outside. Also in the case of this fuel injection pipe, if the fuel leaks from the seat portion 9 and flows into the tightening nut 3 due to insufficient tightening torque of the tightening nut 3, the fuel leaked from the injection pipe main body 1 side. In the same manner, the fuel is recovered from the drain hole 3-1 to the outside through the circumferential groove 7-1 and the through hole 7-2 of the fuel recovery retainer 7. Since the seal member 4c is disposed in the vicinity of the outer end of the screwed portion between the tightening nut 3 and the mating member 8, the fuel flowing into the inner side of the tightening nut 3 is the screwed portion between the tightening nut 3 and the mating member 8. There is no leakage outside.
[0012]
【The invention's effect】
As described above, in the high-pressure fuel injection pipe for a diesel engine according to the present invention, fuel leaks from the injection pipe main body or the seat portion by an annular washer or a screw-in sleeve disposed in the connection head portion of the injection pipe main body. Even in this case, the leaked fuel can be collected outside, and the fuel guided to the inner side of the tightening nut can be removed by arranging a seal member near the outer end of the screwed portion between the tightening nut and the mating member. Therefore, there is no risk of fire due to leaked fuel, and the safety is extremely high.
[Brief description of the drawings]
FIG. 1 is an enlarged longitudinal sectional view showing a main part of an embodiment of a high-pressure fuel injection pipe for a diesel engine according to the present invention.
2 is a front view showing a washer in the fuel injection pipe shown in FIG. 1. FIG.
FIG. 3 is an enlarged longitudinal sectional view showing a main part of another embodiment of the high-pressure fuel injection pipe for a diesel engine according to the present invention.
4 is a front view showing a screw-in sleeve in the fuel injection pipe shown in FIG. 3; FIG.
FIG. 5 is a longitudinal sectional view showing a conventional high-pressure fuel injection pipe for a diesel engine that is a subject of the present invention with a part thereof omitted.
6 is an enlarged longitudinal sectional view showing a main part of the high-pressure fuel injection pipe for a diesel engine shown in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection pipe main body 1-1 Connection head 2 Outer pipe 3 Clamping nut 3-1 Drain holes 4a, 4b, 4c Seal member 5 Annular washer 6 Screw-in sleeve 7 Fuel recovery retainer 7-2 Drain hole 8 Counterpart 9 Seat 10 Retaining ring

Claims (3)

両側端部に接続頭部と該接続頭部の背後に締付けナットを組込んだ噴射管本体の外周側にそれぞれ別体からなる外管を被着重合し、かつ前記外管の両外側端部付近をシール部材を介在して前記締付けナットと係合せしめて構成し、前記接続頭部のなす押圧座面部を相手部材の受圧座面部に当接係合せしめ、前記締付けナットの螺合による前記接続頭部での押圧に伴って締着して相手部材を接続する構造となした高圧燃料噴射管において、前記噴射管本体の接続頭部と締付けナットとの間に、円周上に少なくとも１個の細孔を放射状に設けた環状のワッシャーを嵌合し、さらに前記締付けナットの前記ワッシャーと相手部材との間にドレイン孔を穿設し、前記ワッシャーの細孔より締付けナット内部に流入した燃料または前記接続頭部のなす押圧座面部と相手部材の受圧座面部とのシート部より締付けナット内部に洩れた燃料を前記締付けナットのドレイン孔より回収する構造となしたことを特徴とするディーゼル機関用高圧燃料噴射管。A separate outer pipe is deposited on the outer peripheral side of the injection pipe main body incorporating a connecting head at both ends and a tightening nut behind the connecting head, and both outer ends of the outer pipe The vicinity is configured to be engaged with the tightening nut via a seal member, the press seat surface portion formed by the connection head is brought into contact with and engaged with the pressure receiving seat surface portion of the mating member, and the connection by screwing of the tightening nut is performed. In the high-pressure fuel injection pipe structured to be connected with the counterpart member by being fastened by pressing at the head, at least one on the circumference between the connection head of the injection pipe main body and the fastening nut. An annular washer provided with a radial hole is fitted, a drain hole is further drilled between the washer and the mating member of the clamping nut, and the fuel that has flowed into the clamping nut from the washer pore Or the push made by the connecting head High-pressure fuel injection pipes for diesel engine, wherein a fuel leaked inside the nut tightening the seat portion has no structure to recover from the drain hole of the fastening nut of the pressure receiving seat surface of the seat surface portion and the mating member. 両側端部に接続端部と該接続端部の背後に締付けナットを組込んだ噴射管本体の外周側に、それぞれ別体からなる外管を被着重合し、かつ前記外管の両外側端部付近をシール部材を介在して前記締付けナットと係合せしめて構成し、前記接続端部のなす押圧座面部を相手部材の受圧座面部に当接係合せしめ、前記締付けナットの螺合による前記接続端部での押圧に伴って締着して相手部材を接続する構造となした高圧燃料噴射管において、前記噴射管本体の接続端部と締付けナットとの間に、円周上に少なくとも１つの切込みを放射状に設けた筒状のねじ込み式スリーブを該噴射管本体の接続端部に螺着し、さらに前記締付けナットの前記スリーブと相手部材との間にドレイン孔を穿設し、前記ねじ込み式スリーブの切込みより締付けナット内部に流入した燃料または前記接続端部のなす押圧座面部と相手部材の受圧座面部とのシート部より締付けナット内部に洩れた燃料を前記締付けナットのドレイン孔より回収する構造となしたことを特徴とするディーゼル機関用高圧燃料噴射管。A separate outer tube is attached and polymerized on the outer peripheral side of the injection tube main body in which a connection end and a tightening nut are incorporated behind the connection end on both side ends, and both outer ends of the outer tube The vicinity of the portion is configured to be engaged with the tightening nut with a seal member interposed therebetween, and the pressing seat surface portion formed by the connection end portion is brought into contact with and engaged with the pressure receiving seat surface portion of the mating member, and the tightening nut is screwed. In the high-pressure fuel injection pipe structured to be connected with the counterpart member by being fastened in accordance with the pressing at the connection end, at least 1 is provided on the circumference between the connection end of the injection pipe main body and the tightening nut. A cylindrical screw-type sleeve provided with two incisions is screwed onto the connection end of the injection tube body, and a drain hole is further drilled between the sleeve of the tightening nut and the mating member, and the screw-in Tightening nut from the notch The fuel that has leaked into the clamping nut from the seat portion of the pressure seat surface portion formed by the connecting end portion and the pressure receiving seat surface portion of the mating member is collected from the drain hole of the clamping nut. A high-pressure fuel injection pipe for diesel engines. 前記締付けナットと相手部材との螺合部外側端部付近にシール部材を配した構成となしたことを特徴とする請求項１または２記載のディーゼル機関用高圧燃料噴射管。The high-pressure fuel injection pipe for a diesel engine according to claim 1 or 2, wherein a seal member is disposed in the vicinity of an outer end portion of a screwed portion between the tightening nut and the mating member.
JP13437199A 1999-05-14 1999-05-14 High pressure fuel injection pipe for diesel engine Expired - Fee Related JP4036412B2 (en)

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JP13437199A JP4036412B2 (en) 1999-05-14 1999-05-14 High pressure fuel injection pipe for diesel engine

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