JP3501310B2 - Diesel engine fuel injection tube holding device - Google Patents
Diesel engine fuel injection tube holding deviceInfo
- Publication number
- JP3501310B2 JP3501310B2 JP05107295A JP5107295A JP3501310B2 JP 3501310 B2 JP3501310 B2 JP 3501310B2 JP 05107295 A JP05107295 A JP 05107295A JP 5107295 A JP5107295 A JP 5107295A JP 3501310 B2 JP3501310 B2 JP 3501310B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel injection
- injection pipe
- annular
- seal rubber
- diesel engine
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Fuel-Injection Apparatus (AREA)
- Gasket Seals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ディーゼルエンジンの
燃料噴射管の保持装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding device for a fuel injection pipe of a diesel engine.
【０００２】[0002]
【従来の技術】一般に、ディーゼルエンジンにおいて
は、その燃料噴射ノズルに燃料を供給する燃料噴射管
は、シリンダヘッドカバーに固定されたスリーブナット
内に保持されている。かかる燃料噴射管の保持装置とし
て例えば、実開平４−８９８５９号公報に示すものが知
られている。2. Description of the Related Art Generally, in a diesel engine, a fuel injection pipe for supplying fuel to its fuel injection nozzle is held in a sleeve nut fixed to a cylinder head cover. As such a fuel injection pipe holding device, for example, a device shown in Japanese Utility Model Laid-Open No. 4-89859 is known.
【０００３】この種の燃料噴射管の保持装置の一例を図
７ないし図１２により説明する。図７，図８において、
符号１０１はＶ型エンジンで、Ｖ型エンジン１０１のシ
リンダヘッドカバー１０１Ａにシール部材１０２を介し
てスリーブナット１０３が固定されている。スリーブナ
ット１０３は筒状に構成され、その一端の外周には締付
部１０３Ａが形成され、一端の内周には開口部１０３Ｂ
が形成され、他端内周には雌螺子部１０３Ｃが形成され
ている。スリーブナット１０３の締付部１０３Ａを締め
付けることにより、スリーブナット１０３の他端の雌螺
子部１０３Ｃに噴射ノズル１０４の基端の接続部１０４
Ａが螺子止めされている。これにより、噴射ノズル１０
４はスリーブナット１０３を介してシリンダヘッドカバ
ー１０１Ａに片持ち支持されている。An example of this type of fuel injection pipe holding device will be described with reference to FIGS. 7 and 8,
Reference numeral 101 is a V-type engine, and a sleeve nut 103 is fixed to a cylinder head cover 101A of the V-type engine 101 via a seal member 102. The sleeve nut 103 is formed in a tubular shape, and a tightening portion 103A is formed on the outer circumference of one end of the sleeve nut 103, and an opening portion 103B is formed on the inner circumference of the one end.
And a female screw portion 103C is formed on the inner circumference of the other end. By tightening the tightening portion 103A of the sleeve nut 103, the female screw portion 103C at the other end of the sleeve nut 103 is connected to the connecting portion 104 at the base end of the injection nozzle 104.
A is screwed. Thereby, the injection nozzle 10
Reference numeral 4 is cantilevered on the cylinder head cover 101A via a sleeve nut 103.
【０００４】そして、スリーブナット１０３の開口部１
０３Ｂ内にシールラバー１０５が設けられている。図
９，図１０に示すように、シールラバー１０５は、樹脂
系のゴムを材料として円筒状に構成され、その内周面１
０５Ａに環状山部１０７，環状谷部１０８が交互に形成
されている。シールラバー１０５内を燃料噴射管１０６
が挿通している。シールラバー１０５の環状山部１０７
は燃料噴射管１０６の外径よりも小径になっており、環
状谷部１０８は燃料噴射管１０６の外径よりも大径にな
っている。従って、図１０に示すように、シールラバー
１０５の環状山部１０７は燃料噴射管１０６により圧縮
変形され、燃料噴射管１０６の外周面１０６Ａとシール
ラバー１０５の内周面１０５Ａの間はシールされてい
る。Then, the opening 1 of the sleeve nut 103
A seal rubber 105 is provided in 03B. As shown in FIGS. 9 and 10, the seal rubber 105 is made of resin-based rubber and is formed into a cylindrical shape.
An annular mountain portion 107 and an annular valley portion 108 are alternately formed on 05A. Inside the seal rubber 105, the fuel injection pipe 106
Is inserted. Ring rubber 107 of seal rubber 105
Is smaller than the outer diameter of the fuel injection pipe 106, and the annular valley portion 108 is larger than the outer diameter of the fuel injection pipe 106. Therefore, as shown in FIG. 10, the annular mountain portion 107 of the seal rubber 105 is compressed and deformed by the fuel injection pipe 106, and the space between the outer peripheral surface 106A of the fuel injection pipe 106 and the inner peripheral surface 105A of the seal rubber 105 is sealed. There is.
【０００５】ここで、図１１にはシールラバー１０５と
燃料噴射管１０６の寸法関係が示されている。図におい
て、環状山部１０７と環状谷部１０８を結ぶ線Ｌ１の軸
線方向に対する傾斜角θ１は５３．１度となっている。
また、山谷差＝（環状谷部の半径５ｍｍ−環状山部の半
径３ｍｍ）＝２ｍｍは、燃料噴射管１０６の直径７ｍｍ
に対して２９％となっている。Here, FIG. 11 shows a dimensional relationship between the seal rubber 105 and the fuel injection pipe 106. In the figure, the inclination angle θ1 of the line L1 connecting the annular mountain portion 107 and the annular valley portion 108 with respect to the axial direction is 53.1 degrees.
Further, the difference between peaks and valleys = (radius of annular valley portion 5 mm−radius of annular mountain portion 3 mm) = 2 mm is the diameter of the fuel injection pipe 106 is 7 mm.
Against 29%.
【０００６】次に、シールラバー１０５の製造方法につ
いて図１２により説明する。図において、符号１０９は
シールラバー製造装置を示し、シールラバー製造装置１
０９は上型１１０と、下型１１１と、芯金１１２とから
構成されている。上型１１０には第１円形状凹部１１０
Ａが形成され、第１円形状凹部１１０Ａの中央には円形
溝１１０Ｂが掘設されている。Next, a method of manufacturing the seal rubber 105 will be described with reference to FIG. In the figure, reference numeral 109 indicates a seal rubber manufacturing apparatus, and the seal rubber manufacturing apparatus 1
09 is composed of an upper mold 110, a lower mold 111, and a cored bar 112. The upper die 110 has a first circular recess 110.
A is formed, and a circular groove 110B is dug in the center of the first circular recess 110A.
【０００７】下型１１１には貫通孔１１１Ａが形成さ
れ、貫通孔１１１Ａに連続して第２円形状凹部１１１Ｂ
が形成されている。図には、シールラバー１０５が成形
された状態が示されている。即ち、上型１１０と下型１
１１が閉じ、上型１１０の円形溝１１０Ｂ，下型１１１
の貫通孔１１１Ａに芯金１１２が挿入され、上型１１０
の第１円形状凹部１１０Ａ，下型１１１の第２円形状凹
部１１１Ｂと芯金１１２の外周面１１２Ｃの間に形成さ
れた空洞部１１３にシールラバー１０５が冷却固化した
状態が示されている。A through hole 111A is formed in the lower mold 111, and a second circular recess 111B is formed continuously from the through hole 111A.
Are formed. The figure shows a state in which the seal rubber 105 is molded. That is, the upper mold 110 and the lower mold 1
11, the circular groove 110B of the upper mold 110, the lower mold 111
The core metal 112 is inserted into the through hole 111A of the
The state where the seal rubber 105 is cooled and solidified is shown in the cavity 113 formed between the first circular recess 110A, the second circular recess 111B of the lower mold 111 and the outer peripheral surface 112C of the core 112.
【０００８】かかる状態で、上型１１０と下型１１１が
開かれ、続いて、シールラバー１０５の内周面１０５Ａ
に貫通している芯金１１２が該シールラバー１０５から
図面下方に抜き出され、シールラバー１０５の製造工程
が終了する。In this state, the upper mold 110 and the lower mold 111 are opened, and then the inner peripheral surface 105A of the seal rubber 105 is opened.
The core metal 112 penetrating through the seal rubber 105 is extracted from the seal rubber 105 downward in the drawing, and the manufacturing process of the seal rubber 105 is completed.
【０００９】[0009]
【発明が解決しようとする課題】ところが、従来のディ
ーゼルエンジンの燃料噴射管の保持装置にあっては、燃
料噴射管１０６がスリーブナット１０３の中で振動し、
燃料噴射管１０６がスリーブナット１０３の内周面１０
３Ｄにぶつかって割れる虞があった。また、スリーブナ
ット１０３と燃料噴射管１０６の間に水，オイル，塵等
の異物が詰まり、スリーブナット１０３を噴射ノズル１
０４から取り外した際、オイル，塵等の異物が噴射ノズ
ル１０４に入り込み、噴射ノズル１０４の内部が詰まり
易いという問題があった。However, in the conventional fuel injection pipe holding device for a diesel engine, the fuel injection pipe 106 vibrates in the sleeve nut 103,
The fuel injection pipe 106 is the inner peripheral surface 10 of the sleeve nut 103.
There was a risk of breaking into 3D. In addition, foreign matter such as water, oil, and dust is clogged between the sleeve nut 103 and the fuel injection pipe 106, and the sleeve nut 103 is inserted into the injection nozzle 1
When it is removed from 04, there is a problem that foreign matter such as oil and dust enters the injection nozzle 104, and the inside of the injection nozzle 104 is easily clogged.
【００１０】勿論、シールラバー１０５の環状山部１０
７と環状谷部１０８の半径の差である山谷差を大きくし
たり、或いはシールラバー１０５の硬度を高くすれば、
燃料噴射管１０６はシールラバー１０５に確実に保持さ
れ、燃料噴射管１０６のスリーブナット１０３の中での
振動を少なくし、シールラバー１０５と燃料噴射管１０
６のシール性を向上できるが、反面、シールラバー１０
５の製造時における不良率が大きくなるという問題を生
じさせることになる。なぜなら、シールラバー１０５の
製造時、成形されたシールラバー１０５の内周面１０５
Ａから芯金１１２を抜く際、シールラバー１０５の環状
山部１０７と環状谷部１０８の半径方向の差である山谷
差が大きいと、芯金１１２がシールラバー１０５の環状
山部１０７に引っかかって抜け難くなり、シールラバー
１０５の内周面１０５Ａが切れ易くなるからである。Of course, the annular mountain portion 10 of the seal rubber 105
By increasing the peak-valley difference, which is the difference between the radii of 7 and the annular trough 108, or increasing the hardness of the seal rubber 105,
The fuel injection pipe 106 is securely held by the seal rubber 105 to reduce vibration in the sleeve nut 103 of the fuel injection pipe 106, and to prevent the seal rubber 105 and the fuel injection pipe 10 from being vibrated.
6 can improve the sealability, but on the other hand, the seal rubber 10
5 causes a problem that the defective rate at the time of manufacturing increases. This is because, when the seal rubber 105 is manufactured, the inner peripheral surface 105 of the molded seal rubber 105 is
When the core 112 is pulled out from A, if the difference between the annular peaks 107 and the annular valleys 108 of the seal rubber 105 in the radial direction is large, the core 112 is caught on the annular peak 107 of the seal rubber 105. This is because it becomes difficult to pull out and the inner peripheral surface 105A of the seal rubber 105 is easily cut.
【００１１】要するに、スリーブナット１０３の中にお
ける燃料噴射管の振動を少なくし、燃料噴射管１０６と
シールラバー１０５のシール性を良くし、シールラバー
１０５の製造時の不良率を低減するという３つの要求を
同時に確保することは困難である。本発明は、上述の問
題点を解決するためになされたもので、その目的は、ス
リーブナットの中における燃料噴射管の振動を少なくす
るとともに燃料噴射管とシールラバーのシール性を良く
し、シールラバーの製造時の不良率を低減できるディー
ゼルエンジンの燃料噴射管の保持装置を提供することで
ある。In short, the vibration of the fuel injection pipe in the sleeve nut 103 is reduced, the sealing property between the fuel injection pipe 106 and the seal rubber 105 is improved, and the defective rate at the time of manufacturing the seal rubber 105 is reduced. It is difficult to secure requests at the same time. The present invention has been made to solve the above-mentioned problems, and an object thereof is to reduce the vibration of the fuel injection pipe in the sleeve nut and to improve the sealing property between the fuel injection pipe and the seal rubber to achieve a seal. It is an object of the present invention to provide a device for holding a fuel injection pipe of a diesel engine, which can reduce the defective rate during the production of rubber.
【００１２】[0012]
【課題を解決するための手段】請求項１記載の発明は、
燃料噴射管と、燃料噴射管が挿通するとともにシリンダ
ヘッドカバーに一端が固定されたスリーブナットと、ス
リーブナットの一端に形成された開口部と、開口部内に
設けられ、内周面に、燃料噴射管の外径よりも小径の環
状山部と燃料噴射管の外径よりも大径の環状谷部を交互
に形成してなる円筒状のシールラバーとを備え、環状山
部により燃料噴射管を保持するディーゼルエンジンの燃
料噴射管の保持装置において、燃料噴射管の外径および
環状山部の半径は、それぞれ７ｍｍおよび３ｍｍであ
り、環状山部と環状谷部を結ぶ線の軸線方向に対する傾
斜角θは３０度〜４５度の範囲にあり、かつ、環状山部
と環状谷部の半径の差は燃料噴射管の外径に対して９％
から２６％の範囲にあることを特徴とする。The invention according to claim 1 is
A fuel injection pipe, a sleeve nut through which the fuel injection pipe is inserted and one end of which is fixed to a cylinder head cover, an opening formed at one end of the sleeve nut, and a fuel injection pipe provided in the opening and provided on the inner peripheral surface. With a cylindrical seal rubber formed by alternately forming annular ridges having a diameter smaller than the outer diameter of the fuel injection pipe and annular ridges having a diameter larger than the outer diameter of the fuel injection pipe. In the device for holding the fuel injection pipe of the diesel engine, the outer diameter of the fuel injection pipe and the
The radii of the annular peaks are 7 mm and 3 mm, respectively.
The inclination angle θ of the line connecting the annular mountain portion and the annular valley portion with respect to the axial direction is in the range of 30 degrees to 45 degrees, and the difference in radius between the annular mountain portion and the annular valley portion is the outer diameter of the fuel injection pipe. Against 9%
To 26% in range.
【００１３】 請求項２記載の発明は、燃料噴射管と、
燃料噴射管が挿通するとともにシリンダヘッドカバーに
一端が固定されたスリーブナットと、スリーブナットの
一端に形成された開口部と、開口部内に設けられ、内周
面に、燃料噴射管の外径よりも小径の環状山部と燃料噴
射管の外径よりも大径の環状谷部を交互に形成してなる
円筒状のシールラバーとを備え、環状山部により燃料噴
射管を保持するディーゼルエンジンの燃料噴射管の保持
装置において、シールラバーには、その一端に縮径部が
形成され、燃料噴射管の外径および環状山部の半径は、
それぞれ７ｍｍおよび３ｍｍであり、環状山部と環状谷
部を結ぶ線の軸線方向に対する傾斜角θは３０度〜４５
度の範囲にあり、かつ、環状山部と環状谷部の半径の差
は燃料噴射管の外径に対して９％から２６％の範囲にあ
ることを特徴とする。The invention according to claim 2 is a fuel injection pipe,
A sleeve nut, through which the fuel injection pipe is inserted and one end of which is fixed to the cylinder head cover, an opening formed at one end of the sleeve nut, and an opening provided in the opening. A fuel for a diesel engine that includes a small-diameter annular mountain portion and a cylindrical seal rubber formed by alternately forming annular valley portions that are larger in diameter than the outer diameter of the fuel injection pipe, and holds the fuel injection pipe by the annular mountain portion. In the injection pipe holding device, a reduced diameter portion is formed at one end of the seal rubber, and the outer diameter of the fuel injection pipe and the radius of the annular mountain portion are
They are 7 mm and 3 mm, respectively, and the inclination angle θ of the line connecting the annular mountain portion and the annular valley portion with respect to the axial direction is 30 degrees to 45 degrees.
And the difference in radius between the annular peak and the annular valley is in the range of 9% to 26% with respect to the outer diameter of the fuel injection pipe.
【００１４】[0014]
【作用】請求項１記載の発明においては、シールラバー
の環状山部と環状谷部を結ぶ線の軸線方向に対する傾斜
角θは３０度〜４５度の範囲にあり、かつ、環状山部と
環状谷部の半径の差は燃料噴射管の外径に対して９％か
ら２６％の範囲にある。従って、環状山部の圧縮変形が
大きく、環状山部と燃料噴射管の接触面積が確保され、
燃料噴射管とスリーブナットのシール性が良くなり、シ
ールラバーによる燃料噴射管の保持が確実になる。According to the first aspect of the invention, the angle of inclination θ of the line connecting the annular ridge portion and the annular valley portion of the seal rubber with respect to the axial direction is in the range of 30 ° to 45 °, and the annular ridge portion and the annular ridge portion. The difference in the radius of the valley portion is in the range of 9% to 26% with respect to the outer diameter of the fuel injection pipe. Therefore, the compression deformation of the annular mountain portion is large, and the contact area between the annular mountain portion and the fuel injection pipe is secured,
The sealing property between the fuel injection pipe and the sleeve nut is improved, and the fuel injection pipe is reliably held by the seal rubber.
【００１５】また、同時に、シールラバーは、一対の型
と芯金の間に形成された空洞部に素材を流し込んで成形
され、続いて芯金が抜かれるが、芯金がシールラバーか
ら抜かれる際、抜け易い。請求項２記載の発明において
は、請求項１記載の発明による作用が生じる。さらに、
シールラバーには、その一端に縮径部が形成されている
ので、シールラバーと燃料噴射管のシール性がより向上
する。At the same time, the seal rubber is molded by pouring the material into the cavity formed between the pair of molds and the core metal, and then the core metal is removed, but the core metal is removed from the seal rubber. It is easy to come off. In the invention described in claim 2, the operation according to the invention described in claim 1 occurs. further,
Since the reduced diameter portion is formed at one end of the seal rubber, the sealability between the seal rubber and the fuel injection pipe is further improved.
【００１６】[0016]
【実施例】以下、図面により本発明の実施例について説
明する。図１ないし図３は請求項１記載の発明に係るデ
ィーゼルエンジンの燃料噴射管の保持装置の一実施例を
示す。本実施例に係るディーゼルエンジンの燃料噴射管
の保持装置について、従来におけるディーゼルエンジン
の燃料噴射管の保持装置と相違している部分のみを説明
する。本実施例においては、従来の構成部品と同一の部
品には同一の符合を付し、その説明を省略する。Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a device for holding a fuel injection pipe of a diesel engine according to the first aspect of the invention. With respect to the holding device for the fuel injection pipe of the diesel engine according to the present embodiment, only the parts different from the holding device for the fuel injection pipe of the conventional diesel engine will be described. In the present embodiment, the same components as those of the conventional components are designated by the same reference numerals, and the description thereof will be omitted.
【００１７】図において、符合１はシールラバーで、樹
脂系のゴムを材料として円筒状に構成され、その内周面
１Ａに、環状山部２と環状谷部３を交互に形成してな
る。環状山部２は燃料噴射管１０６の径よりも小径で、
環状谷部３は燃料噴射管１０６の径よりも大径になって
いる。環状山部２と環状谷部３を結ぶ線Ｌ２の軸線方向
に対する傾斜角θは４１度となっている。また、山谷差
＝（環状谷部の半径４．２５ｍｍ−環状山部の半径３ｍ
ｍ）＝１．２５ｍｍは、燃料噴射管１０６の直径７ｍｍ
に対して１８％となっている。In the figure, reference numeral 1 is a seal rubber, which is made of resin-based rubber and is formed into a cylindrical shape. An annular mountain portion 2 and an annular valley portion 3 are alternately formed on an inner peripheral surface 1A thereof. The annular mountain portion 2 has a diameter smaller than that of the fuel injection pipe 106,
The annular valley portion 3 has a diameter larger than that of the fuel injection pipe 106. The inclination angle θ of the line L2 connecting the annular mountain portion 2 and the annular valley portion 3 with respect to the axial direction is 41 degrees. In addition, the difference between the valleys and valleys = (radius of the annular valley portion 4.25 mm-radius of the annular mountain portion 3 m
m) = 1.25 mm is the diameter of the fuel injection pipe 106 is 7 mm
Against 18%.
【００１８】次に、本実施例の作用，効果を説明する。
従来例で述べた一対の型１１０，１１１と芯金１１２の
間に形成された空洞部１１３に成形されたシールラバー
１から芯金１１２を抜いて、シールラバー１が造られる
が、山谷差＝（環状谷部の半径４．２５ｍｍ−環状山部
の半径３ｍｍ）＝１．２５ｍｍは、燃料噴射管１０６の
直径７ｍｍに対して１８％となっているので、シールラ
バー１の製造時、シールラバー１の内周面１Ａに貫通し
ている芯金１１２が環状山部２に引っかからず、芯金１
１２を抜き易くできる。従って、シールラバー１の内周
面１Ａを切れ難くし、不良率を低減できた。同時に、環
状山部２の圧縮変形が大きく、環状山部２と燃料噴射管
１０６の接触面積をも確保し、燃料噴射管１０６とスリ
ーブナット１０３のシール性を良くできた。Next, the operation and effect of this embodiment will be described.
The core metal 112 is removed from the seal rubber 1 formed in the cavity 113 formed between the pair of molds 110 and 111 and the core metal 112 described in the conventional example, and the seal rubber 1 is manufactured. (Radius of annular valley portion 4.25 mm−Radius of annular mountain portion 3 mm) = 1.25 mm is 18% with respect to the diameter 7 mm of the fuel injection pipe 106, and therefore the seal rubber 1 is manufactured. The core metal 112 penetrating the inner peripheral surface 1A of 1 does not get caught in the annular mountain portion 2,
12 can be easily pulled out. Therefore, the inner peripheral surface 1A of the seal rubber 1 is hard to be cut, and the defective rate can be reduced. At the same time, the compression deformation of the annular mountain portion 2 was large, the contact area between the annular mountain portion 2 and the fuel injection pipe 106 was secured, and the sealability between the fuel injection pipe 106 and the sleeve nut 103 was improved.
【００１９】これはテストにより確認されている。即
ち、エンジンの振動試験により、燃料噴射管１０６にス
トレインゲージを貼り付け、燃料噴射管１０６の振動の
振幅を測定したところ、振幅が少ないことが確認され
た。また、シールラバー１と燃料噴射管１０６の間の単
体としてのシールテスト（３ｋｇ／ｃｍ2 の水圧テス
ト）を行ったところ、シール性も確保された。また、燃
料噴射管１０６のシールラバー１に対する挿入し易さも
確保された。This has been confirmed by testing. That is, when the strain gauge was attached to the fuel injection pipe 106 and the amplitude of the vibration of the fuel injection pipe 106 was measured by the vibration test of the engine, it was confirmed that the amplitude was small. Further, when a seal test as a unit between the seal rubber 1 and the fuel injection pipe 106 (a water pressure test of 3 kg / cm 2 ) was performed, the sealing property was also secured. Also, the ease of inserting the fuel injection pipe 106 into the seal rubber 1 was ensured.
【００２０】このように、製造時、シールラバー１を切
れ難くして不良率を低減でき、同時に、燃料噴射管１０
６とスリーブナット１０３のシール性を良くでき、シー
ルラバー１と燃料噴射管１０６の間への水，オイル，塵
等の異物の浸入を防止し、スリーブナット１０３を噴射
ノズル１０４から取り外した際の噴射ノズル１０４の内
部の詰まりを防止できた。また、燃料噴射管のスリーブ
ナット１０３の中で振動を少なくし、燃料噴射管１０６
がスリーブナット１０３の内周面にぶつかって割れる虞
を少なくできた。As described above, the seal rubber 1 is less likely to break during manufacturing, and the defective rate can be reduced. At the same time, the fuel injection pipe 10
6 and the sleeve nut 103 can be improved in sealing property, foreign matter such as water, oil, and dust can be prevented from entering between the seal rubber 1 and the fuel injection pipe 106, and the sleeve nut 103 can be removed from the injection nozzle 104. It was possible to prevent clogging inside the injection nozzle 104. Further, vibration is reduced in the sleeve nut 103 of the fuel injection pipe,
It was possible to reduce the possibility that the rubber bumps against the inner peripheral surface of the sleeve nut 103 and cracks.
【００２１】なお、本実施例においては、環状山部２と
環状谷部３を結ぶ線Ｌ２の軸線方向に対する傾斜角θは
４１度となっており、また、山谷差＝（環状谷部の半径
４．２５ｍｍ−環状山部の半径３ｍｍ）＝１．２５ｍｍ
は、燃料噴射管１０６の直径７ｍｍに対して１８％とな
っている場合について説明したが、かかる数値に限定さ
れることなく、環状山部２と環状谷部３を結ぶ線Ｌ２の
軸線方向に対する傾斜角θが３０度〜４５度の範囲にあ
り、かつ、環状山部と環状谷部の半径の差は燃料噴射管
の外径に対して９％から２６％の範囲にある場合にも、
同様の効果を生じることが上述のテストにより確認され
ている。In this embodiment, the inclination angle θ of the line L2 connecting the annular mountain portion 2 and the annular valley portion 3 with respect to the axial direction is 41 degrees, and the difference between the mountain valleys = (radius of the annular valley portion 4.25 mm-radius of annular mountain part 3 mm) = 1.25 mm
Has described the case where the diameter is 18% with respect to the diameter of the fuel injection pipe 106 of 7 mm, but is not limited to such a numerical value, and the line L2 connecting the annular mountain portion 2 and the annular valley portion 3 with respect to the axial direction. Even when the inclination angle θ is in the range of 30 degrees to 45 degrees and the difference in radius between the annular mountain portion and the annular valley portion is in the range of 9% to 26% with respect to the outer diameter of the fuel injection pipe,
It has been confirmed by the above-mentioned test that the same effect is produced.
【００２２】即ち、傾斜角θが３０度より小さいと、燃
料噴射管１０６とスリーブナット１０３のシール性が確
保されない。傾斜角θが４５度より大きいと、製造時、
シールラバー１が切れ易くなる。また、環状山部２と環
状谷部３の半径の差が燃料噴射管１０６の外径に対して
９％より小さいと、燃料噴射管１０６とスリーブナット
１０３のシール性が確保されない。環状山部２と環状谷
部３の半径の差が燃料噴射管１０６の外径に対して２６
％より大きいと、製造時、シールラバー１が切れ易くな
る。That is, if the inclination angle θ is less than 30 degrees, the sealing performance between the fuel injection pipe 106 and the sleeve nut 103 cannot be ensured. If the inclination angle θ is larger than 45 degrees,
The seal rubber 1 is easily cut. If the difference in radius between the annular mountain portion 2 and the annular valley portion 3 is smaller than 9% of the outer diameter of the fuel injection pipe 106, the sealability between the fuel injection pipe 106 and the sleeve nut 103 cannot be ensured. The difference in radius between the annular mountain portion 2 and the annular valley portion 3 is 26 with respect to the outer diameter of the fuel injection pipe 106.
If it is larger than%, the seal rubber 1 is likely to break during manufacturing.
【００２３】次に、請求項２記載の発明に係るディーゼ
ルエンジンの燃料噴射管の保持装置の一実施例を図４，
図５により説明する。請求項２記載の発明の実施例に係
るディーゼルエンジンの燃料噴射管の保持装置の、請求
項１記載の発明の実施例に係るディーゼルエンジンの燃
料噴射管の保持装置と相違している部分についてのみ説
明する。なお、本実施例においては、請求項１記載の発
明の実施例の構成部品と同一の部品には同一の符合を付
し、その説明を省略する。Next, one embodiment of the device for holding the fuel injection pipe of the diesel engine according to the invention of claim 2 is shown in FIG.
This will be described with reference to FIG. Only the portion of the holding device for the fuel injection pipe of the diesel engine according to the second embodiment of the invention that differs from the holding device for the fuel injection pipe of the diesel engine according to the first embodiment of the invention is described. explain. In this embodiment, the same parts as those of the embodiment of the invention described in claim 1 are designated by the same reference numerals, and the description thereof will be omitted.
【００２４】図に示すように、シールラバー１の軸長方
向の一端１Ｂには縮径部４が形成されている。縮径部４
は、環状山部２より内方に先端が伸び、中央に孔の開い
た傘状のリップ部になっており、スリーブナット１０３
の一端の端面１０３Ｅ側の側に位置して、スリーブナッ
ト１０３の一端の端面１０３Ｅより図面の上方に向けて
突出している。As shown in the figure, a reduced diameter portion 4 is formed at one end 1B of the seal rubber 1 in the axial direction. Reduced part 4
Is an umbrella-shaped lip portion having a tip extending inward from the annular mountain portion 2 and having a hole in the center.
It is located on the end surface 103E side of one end of the sleeve nut 103 and projects upward from the end surface 103E of the one end of the sleeve nut 103 in the drawing.
【００２５】縮径部４の内径は５．５ｍｍであり、燃料
噴射管１０６の直径７ｍｍに対して７９％となってい
る。本実施例によれば、請求項１記載の発明の実施例に
係るディーゼルエンジンの燃料噴射管の保持装置の実施
例による効果に加えて、シールラバー１は、縮径部４を
有しているので、シールラバー１と燃料噴射管１０６の
シール性をより向上させることができた。燃料噴射管１
０６のシールラバー１に対する挿入し易さも確保でき
た。The inner diameter of the reduced diameter portion 4 is 5.5 mm, which is 79% of the diameter of the fuel injection pipe 106 of 7 mm. According to this embodiment, in addition to the effect of the embodiment of the holding device for the fuel injection pipe of the diesel engine according to the embodiment of the invention described in claim 1, the seal rubber 1 has the reduced diameter portion 4. Therefore, the sealability between the seal rubber 1 and the fuel injection pipe 106 can be further improved. Fuel injection pipe 1
It was also possible to secure the ease of inserting the No. 06 seal rubber 1 into the seal rubber 1.
【００２６】なお、本実施例においては、縮径部４の内
径は燃料噴射管１０６の直径７ｍｍに対して７９％とな
っているが、燃料噴射管１０６の直径の６４％〜９３％
に対しても燃料噴射管１０６をシールラバー１に挿入し
易くし、かつ、シール性を確保できる。また、本実施例
においては、シールラバー１の縮径部４は中央に孔の開
いた傘状のリップ部になっているが、図６に示すよう
に、円筒体２１の内周面２１Ａの一端に該内周面２１Ａ
の環状山部２２よりも径の小さい縮径部２３を形成する
こともできる。In this embodiment, the inner diameter of the reduced diameter portion 4 is 79% with respect to the diameter of the fuel injection pipe 106 of 7 mm, but 64% to 93% of the diameter of the fuel injection pipe 106.
However, the fuel injection pipe 106 can be easily inserted into the seal rubber 1 and the sealing performance can be secured. Further, in the present embodiment, the reduced diameter portion 4 of the seal rubber 1 is an umbrella-shaped lip portion having a hole in the center, but as shown in FIG. 6, the inner peripheral surface 21A of the cylindrical body 21 is The inner peripheral surface 21A at one end
It is also possible to form a reduced diameter portion 23 having a diameter smaller than that of the annular mountain portion 22.
【００２７】[0027]
【発明の効果】請求項１記載の発明によれば、シールラ
バーの環状山部と環状谷部を結ぶ線の軸線方向に対する
傾斜角θは３０度〜４５度の範囲にあり、かつ、環状山
部と環状谷部の半径の差は燃料噴射管の外径に対して９
％から２６％の範囲にある。従って、環状山部の圧縮変
形が大きく、環状山部と燃料噴射管の接触面積を確保
し、燃料噴射管とスリーブナットのシール性を良くし、
シールラバーによる燃料噴射管の保持を確実にできる。According to the invention of claim 1, the inclination angle θ of the line connecting the annular peak portion and the annular valley portion of the seal rubber with respect to the axial direction is in the range of 30 to 45 degrees, and the annular mountain is The difference between the radius of the section and the annular valley is 9 with respect to the outer diameter of the fuel injection pipe.
% To 26%. Therefore, the compression deformation of the annular mountain portion is large, the contact area between the annular mountain portion and the fuel injection pipe is secured, and the sealability between the fuel injection pipe and the sleeve nut is improved,
The fuel injection pipe can be reliably held by the seal rubber.
【００２８】また、同時に、シールラバーの製造時、シ
ールラバーの内周面に貫通している芯金が環状山部に引
っかからず、芯金を抜き易くできる。従って、芯金がシ
ールラバーから抜かれる際、抜け易い。シールラバーの
内周面を切れ難くし、不良率を低減できる。要するに、
シールラバーの製造時、シールラバーの内周面を切れ難
くして不良率を低減できる。同時に、燃料噴射管とスリ
ーブナットのシール性を良くし、シールラバーと燃料噴
射管の間への水，オイル，塵等の異物の浸入を防止し、
スリーブナットを噴射ノズルから取り外した際の噴射ノ
ズルの内部の詰まりを防止できる。また、燃料噴射管の
スリーブナットの中で振動を少なくし、燃料噴射管がス
リーブナットの内周面にぶつかって割れる虞を少なくで
きる。At the same time, at the time of manufacturing the seal rubber, the core bar penetrating the inner peripheral surface of the seal rubber does not get caught in the annular mountain portion, so that the core bar can be easily removed. Therefore, when the core metal is pulled out from the seal rubber, it is easy to pull out. The inner peripheral surface of the seal rubber is hard to cut, and the defective rate can be reduced. in short,
When manufacturing the seal rubber, it is possible to reduce the defect rate by making it difficult to cut the inner peripheral surface of the seal rubber. At the same time, it improves the sealability between the fuel injection pipe and the sleeve nut, and prevents foreign matter such as water, oil and dust from entering between the seal rubber and the fuel injection pipe.
It is possible to prevent clogging inside the injection nozzle when the sleeve nut is removed from the injection nozzle. Further, vibration can be reduced in the sleeve nut of the fuel injection pipe, and the risk of the fuel injection pipe colliding with the inner peripheral surface of the sleeve nut and cracking can be reduced.
【００２９】請求項２記載の発明によれば、請求項１記
載の発明による効果に加えて、シールラバーには、その
一端に縮径部が形成されているので、シールラバーと燃
料噴射管のシール性をより向上させることができる。According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the seal rubber has a reduced diameter portion at one end thereof, the seal rubber and the fuel injection pipe are The sealing property can be further improved.
【図１】請求項１記載の発明の実施例に係わるディーゼ
ルエンジンの燃料噴射管の保持装置におけるシールラバ
ーを示す断面図である。FIG. 1 is a cross-sectional view showing a seal rubber in a device for holding a fuel injection pipe of a diesel engine according to an embodiment of the present invention.
【図２】同ディーゼルエンジンの燃料噴射管の保持装置
の要部を示す断面図である。FIG. 2 is a cross-sectional view showing a main part of a holding device for a fuel injection pipe of the diesel engine.
【図３】同保持装置におけるシールラバーと燃料噴射管
の関係を示す説明図である。FIG. 3 is an explanatory view showing a relationship between a seal rubber and a fuel injection pipe in the holding device.
【図４】請求項２記載の発明の実施例に係わるディーゼ
ルエンジンの燃料噴射管の保持装置におけるシールラバ
ーを示す断面図である。FIG. 4 is a cross-sectional view showing a seal rubber in a device for holding a fuel injection pipe of a diesel engine according to an embodiment of the present invention.
【図５】同ディーゼルエンジンの燃料噴射管の保持装置
の要部を示す断面図である。FIG. 5 is a cross-sectional view showing a main part of a holding device for a fuel injection pipe of the diesel engine.
【図６】同保持装置におけるシールラバーの変形例を示
す断面図である。FIG. 6 is a cross-sectional view showing a modified example of the seal rubber in the holding device.
【図７】従来におけるディーゼルエンジンの燃料噴射管
の保持装置を示すエンジンの断面図である。FIG. 7 is a cross-sectional view of an engine showing a conventional device for holding a fuel injection pipe of a diesel engine.
【図８】同ディーゼルエンジンの燃料噴射管の保持装置
を示す断面図である。FIG. 8 is a cross-sectional view showing a holding device for a fuel injection pipe of the diesel engine.
【図９】同保持装置におけるシールラバーを示す断面図
である。FIG. 9 is a cross-sectional view showing a seal rubber in the holding device.
【図１０】同保持装置の要部を示す断面図である。FIG. 10 is a cross-sectional view showing the main parts of the holding device.
【図１１】同保持装置におけるシールラバーと燃料噴射
管の関係を示す説明図である。FIG. 11 is an explanatory diagram showing a relationship between a seal rubber and a fuel injection pipe in the holding device.
【図１２】シールラバー製造装置を示す断面図である。FIG. 12 is a cross-sectional view showing a seal rubber manufacturing apparatus.
１ シールラバー １Ａ 内周面 １Ｂ 一端 ２ 環状山部 ３ 環状谷部 ４ 縮径部 １０１Ａ シリンダヘッドカバー １０３ スリーブナット １０３Ｂ 開口部 １０６ 燃料噴射管 1 seal rubber 1A Inner surface 1B One end 2 ring mountain part 3 annular valley 4 Reduced diameter part 101A cylinder head cover 103 Sleeve nut 103B opening 106 Fuel injection pipe
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−283424（ＪＰ，Ａ) 特開 平７−307182（ＪＰ，Ａ) 特開 平８−22862（ＪＰ，Ａ) 実開 昭53−113920（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02M 55/02 320 F02M 55/02 330 F02M 55/02 350 F02M 61/16 F16J 15/06 F16J 15/10 ─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-1-283424 (JP, A) JP-A-7-307182 (JP, A) JP-A-8-22862 (JP, A) Actual development Sho-53- 113920 (JP, U) (58) Fields surveyed (Int.Cl. 7 , DB name) F02M 55/02 320 F02M 55/02 330 F02M 55/02 350 F02M 61/16 F16J 15/06 F16J 15/10
Claims (2)
一端が固定されたスリーブナットと、 スリーブナットの一端に形成された開口部と、 開口部内に設けられ、内周面に、燃料噴射管の外径より
も小径の環状山部と燃料噴射管の外径よりも大径の環状
谷部を交互に形成してなる円筒状のシールラバーとを備
え、 環状山部により燃料噴射管を保持するディーゼルエンジ
ンの燃料噴射管の保持装置において、燃料噴射管の外径および環状山部の半径は、それぞれ７
ｍｍおよび３ｍｍであり、 環状山部と環状谷部を結ぶ線の軸線方向に対する傾斜角
θは３０度〜４５度の範囲にあり、かつ、環状山部と環
状谷部の半径の差は燃料噴射管の外径に対して９％から
２６％の範囲にあることを特徴とするディーゼルエンジ
ンの燃料噴射管の保持装置。1. A fuel injection pipe, a sleeve nut through which the fuel injection pipe is inserted and one end of which is fixed to a cylinder head cover, an opening formed at one end of the sleeve nut, and an inner peripheral surface provided in the opening. , A cylindrical seal rubber formed by alternately forming annular ridges having a diameter smaller than the outer diameter of the fuel injection pipe and annular ridges having a diameter larger than the outer diameter of the fuel injection pipe. In a fuel injection pipe holding device for a diesel engine that holds a fuel injection pipe, the outer diameter of the fuel injection pipe and the radius of the annular mountain portion are each 7
mm and 3 mm, the inclination angle θ of the line connecting the annular mountain portion and the annular valley portion with respect to the axial direction is in the range of 30 degrees to 45 degrees, and the difference in radius between the annular mountain portion and the annular valley portion is the fuel injection. A holding device for a fuel injection pipe of a diesel engine, which is in a range of 9% to 26% with respect to an outer diameter of the pipe.
一端が固定されたスリーブナットと、 スリーブナットの一端に形成された開口部と、 開口部内に設けられ、内周面に、燃料噴射管の外径より
も小径の環状山部と燃料噴射管の外径よりも大径の環状
谷部を交互に形成してなる円筒状のシールラバーとを備
え、 環状山部により燃料噴射管を保持するディーゼルエンジ
ンの燃料噴射管の保持装置において、 シールラバーには、その一端に縮径部が形成され、燃料噴射管の外径および環状山部の半径は、それぞれ７
ｍｍおよび３ｍｍであり、 環状山部と環状谷部を結ぶ線の軸線方向に対する傾斜角
θは３０度〜４５度の範囲にあり、かつ、環状山部と環
状谷部の半径の差は燃料噴射管の外径に対して９％から
２６％の範囲にあることを特徴とするディーゼルエンジ
ンの燃料噴射管の保持装置。2. A fuel injection pipe, a sleeve nut through which the fuel injection pipe is inserted and one end of which is fixed to a cylinder head cover, an opening formed at one end of the sleeve nut, and an inner peripheral surface provided in the opening. , A cylindrical seal rubber formed by alternately forming annular ridges having a diameter smaller than the outer diameter of the fuel injection pipe and annular ridges having a diameter larger than the outer diameter of the fuel injection pipe. In a fuel injection pipe holding device for a diesel engine that holds a fuel injection pipe, a reduced diameter portion is formed at one end of a seal rubber, and the outer diameter of the fuel injection pipe and the radius of the annular mountain portion are each 7
mm and 3 mm, the inclination angle θ of the line connecting the annular mountain portion and the annular valley portion with respect to the axial direction is in the range of 30 degrees to 45 degrees, and the difference in radius between the annular mountain portion and the annular valley portion is the fuel injection. A holding device for a fuel injection pipe of a diesel engine, which is in a range of 9% to 26% with respect to an outer diameter of the pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05107295A JP3501310B2 (en) | 1995-03-10 | 1995-03-10 | Diesel engine fuel injection tube holding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05107295A JP3501310B2 (en) | 1995-03-10 | 1995-03-10 | Diesel engine fuel injection tube holding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08246989A JPH08246989A (en) | 1996-09-24 |
| JP3501310B2 true JP3501310B2 (en) | 2004-03-02 |
Family
ID=12876615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05107295A Expired - Lifetime JP3501310B2 (en) | 1995-03-10 | 1995-03-10 | Diesel engine fuel injection tube holding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3501310B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248846A (en) * | 2004-03-04 | 2005-09-15 | Bosch Automotive Systems Corp | Sealing structure for fuel passage and fuel injection valve equipped with the sealing structure |
| US9138438B2 (en) | 2005-03-31 | 2015-09-22 | Asahi Glass Company, Limited | Method for protecting a retinal neuronal cell |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11190262A (en) * | 1997-12-25 | 1999-07-13 | Hino Motors Ltd | Water-infiltration-prevention cap |
| KR20020084552A (en) * | 2001-05-03 | 2002-11-09 | 현대자동차주식회사 | Fuel pipe of diesel engine |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS577787Y2 (en) * | 1977-02-18 | 1982-02-15 | ||
| DE3808125A1 (en) * | 1988-03-11 | 1989-11-23 | Man Nutzfahrzeuge Ag | THREADED INSERT WITH A SMALL EXTERNAL DIAMETER FOR SCREWS WITH KEYSTONE THREAD |
| JP3010411B2 (en) * | 1994-03-18 | 2000-02-21 | 矢崎総業株式会社 | Waterproof rubber stopper and waterproof connector |
| JPH0822862A (en) * | 1994-07-07 | 1996-01-23 | Yazaki Corp | Waterproof rubber plug |
-
1995
- 1995-03-10 JP JP05107295A patent/JP3501310B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248846A (en) * | 2004-03-04 | 2005-09-15 | Bosch Automotive Systems Corp | Sealing structure for fuel passage and fuel injection valve equipped with the sealing structure |
| US9138438B2 (en) | 2005-03-31 | 2015-09-22 | Asahi Glass Company, Limited | Method for protecting a retinal neuronal cell |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08246989A (en) | 1996-09-24 |
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