JP3337391B2 - Metal seal structure for fuel injection system of automotive diesel engine - Google Patents
Metal seal structure for fuel injection system of automotive diesel engineInfo
- Publication number
- JP3337391B2 JP3337391B2 JP03989297A JP3989297A JP3337391B2 JP 3337391 B2 JP3337391 B2 JP 3337391B2 JP 03989297 A JP03989297 A JP 03989297A JP 3989297 A JP3989297 A JP 3989297A JP 3337391 B2 JP3337391 B2 JP 3337391B2
- Authority
- JP
- Japan
- Prior art keywords
- tapered portion
- taper
- female
- male
- seal structure
- 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
- 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
- F02M55/025—Common rails
-
- 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
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車用ディーゼ
ルエンジンの燃料噴射系の接続部に使用されるメタルシ
ール構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel for automobiles.
The present invention relates to a metal seal structure used for a connection portion of a fuel injection system of an engine .
【０００２】[0002]
【従来の技術】図３は、自動車用ディーゼルエンジンの
燃料噴射系の途中部における、金属製のブロック４０と
圧力センサ５０との接続部を示している。ブロック４０
には、高圧燃料（軽油）４２が流動する燃料流路４１が
形成されるとともに、該燃料流路４１と直交する方向
に、圧力センサ５０を接続するための雌ねじ穴４３、凹
円錐面状のメス側テーパ部４４及び連通穴４５が形成さ
れている。圧力センサ５０は金属製の雄ねじ部５１、円
筒部５２及び凸円錐面状のオス側テーパ部５３を備えて
いる。雄ねじ部５１を雌ねじ穴４３に螺合して締付ける
と、その締付けにより発生する軸力で、金属製のオス側
テーパ部５３がメス側テーパ部４４に食い込んで密に接
触し、高圧燃料４２の漏れを防ぐようになっている（メ
タルシール構造）。2. Description of the Related Art FIG. 3 shows a connecting portion between a metal block 40 and a pressure sensor 50 at an intermediate portion of a fuel injection system of an automobile diesel engine. Block 40
A fuel passage 41 through which a high-pressure fuel (light oil) 42 flows is formed, and a female screw hole 43 for connecting a pressure sensor 50 in a direction orthogonal to the fuel passage 41, A female side taper portion 44 and a communication hole 45 are formed. The pressure sensor 50 includes a metal external thread portion 51, a cylindrical portion 52, and a male taper portion 53 having a convex conical surface shape. When the male screw portion 51 is screwed into the female screw hole 43 and tightened, the axial force generated by the tightening causes the male male taper portion 53 to bite into the female taper portion 44 and come into close contact therewith. It is designed to prevent leakage (metal seal structure).
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記メタル
シール構造では、メス側テーパ部４４とオス側テーパ部
５３とのテーパ角度が等しい（厳密には、前記ねじの締
付け時に弾性変形によって両テーパ角度が等しくなるよ
うに、オス側テーパ部の方が１〜２度小さく設定されて
いる）とともに、オス側テーパ部５３が長く拡径してい
て、メス側テーパ部４４の最大径Ａよりオス側テーパ部
５３の最大径Ｂの方が大きくなっているため、メス側テ
ーパ部４４の最大径Ａにおける角部がオス側テーパ部５
３の凸円錐面の途中部に接触することになる。このた
め、前記軸力によって、オス側テーパ部５３がメス側テ
ーパ部４４に食い込んだときに、前記メス側テーパ部４
４の角部とオス側テーパ部５３の途中部との接触部位に
応力集中が起こり、該接触部位に焼付及び／又はかじり
５５が生じ易いという問題があった。However, in the above metal seal structure, the taper angles of the female side taper portion 44 and the male side taper portion 53 are equal (strictly speaking, both taper angles due to elastic deformation when the screw is tightened). The male side taper portion 53 is set to be smaller by 1 to 2 degrees so that the diameter of the male side taper portion 53 becomes longer. Since the maximum diameter B of the tapered portion 53 is larger, the corner portion of the female-side tapered portion 44 at the maximum diameter A is equal to the male-side tapered portion 5.
No. 3 comes into contact with an intermediate portion of the convex conical surface. For this reason, when the male-side taper portion 53 bites into the female-side taper portion 44 due to the axial force, the female-side taper portion 4
There is a problem that stress concentration occurs at a contact portion between the corner portion of No. 4 and the middle portion of the male-side tapered portion 53, and seizure and / or galling 55 easily occur at the contact portion.
【０００４】しかも、エンジンの点検・整備の際には、
圧力センサ５０もブロック４０から取外して点検・整備
した後に再接続する必要があり、この取外し・再接続を
何回も繰返すと、前記接触部位の応力集中が繰返し起こ
るから、前記焼付・かじり５５がさらに生じ易くなった
り悪化したりする。In addition, when inspecting and maintaining the engine,
The pressure sensor 50 also needs to be removed from the block 40, inspected and maintained, and then reconnected. If the removal and reconnection are repeated many times, the stress concentration at the contact portion occurs repeatedly. In addition, they are more likely to occur or worsen.
【０００５】このように焼付・かじり５５が生じ、悪化
すると、メタルシール構造はシール不能となり、メス側
テーパ部４４及び／又はオス側テーパ部５３の修正や、
ブロック４０及び／又は圧力センサ５０の部品交換が必
要となる。[0005] When the seizure and galling 55 occur and deteriorate, the metal seal structure cannot be sealed, and the female side taper portion 44 and / or the male side taper portion 53 can be repaired.
Parts of the block 40 and / or the pressure sensor 50 need to be replaced.
【０００６】こうした焼付・かじりを防止する対策とし
て、図５に示すように、前記メス側テーパ部４４の角部
にＲ面取り部４６を加工し、前記応力を分散させること
も考えられる。しかし、Ｒ面取り部４６の加工は、比較
的径の小さい雌ねじ穴４３の穴底における作業となるた
め、工法上の制約を受け、容易ではない。As a countermeasure to prevent such seizure and galling, as shown in FIG. 5, an R chamfer 46 may be formed at a corner of the female side taper 44 to disperse the stress. However, since the processing of the R chamfered portion 46 is performed at the bottom of the female screw hole 43 having a relatively small diameter, it is not easy due to restrictions on the construction method.
【０００７】また、図６に示すように、オス側テーパ部
５３を短く拡径させて、その最大径Ｂをメス側テーパ部
４４の最大径Ａより小さくするとともに、円筒部５２と
オス側テーパ部５３との境界部にＲ面取り部５４を加工
することも考えられる。この対策によれば、オス側テー
パ部５３の最大径Ｂにおける角部がメス側テーパ部４４
の凹円錐面の途中部に接触することになるが、該角部に
はＲ面取り部５４が加工されているため応力集中が起こ
らず、焼付・かじりを防止することができる。しかし、
オス側テーパ部５３の最大径Ｂ、即ち、円筒部５２の径
Ｂが小さいと、両部５３，５２の剛性が低下し、雄ねじ
部５１の沈みが大きくなりすぎる等の問題がある。Further, as shown in FIG. 6, the male side taper portion 53 is made to have a short diameter and the maximum diameter B is made smaller than the maximum diameter A of the female side taper portion 44. It is conceivable to process the R chamfered portion 54 at the boundary with the portion 53. According to this countermeasure, the corner portion of the male side taper portion 53 at the maximum diameter B is the female side taper portion 44.
However, since the R-chamfered portion 54 is formed at the corner, stress concentration does not occur, and seizure and galling can be prevented. But,
If the maximum diameter B of the male-side tapered portion 53, that is, the diameter B of the cylindrical portion 52, is small, the rigidity of the two portions 53, 52 decreases, and there is a problem that the sinking of the male screw portion 51 becomes too large.
【０００９】本発明の目的は、上記課題を解決し、焼付
・かじりが生じにくいだけでなく、加工の制約も少な
く、剛性を低下させることもない自動車用ディーゼルエ
ンジンの燃料噴射系のメタルシール構造を提供すること
にある。An object of the present invention is to solve the above problems, not only baking galling is unlikely to occur, constraint processing is small and diesel et automotive not reduced stiffness
An object of the present invention is to provide a metal seal structure for a fuel injection system of an engine .
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、自動車用ディーゼルエンジンの燃料噴射
系の接続部に設けられて、雄ねじ部（２）と雌ねじ穴
（２３）との締付けにより発生する軸力で互いに密に接
触する金属製の凹円錐面状のメス側テーパ部（２４）と
金属製の凸円錐面状のオス側テーパ部（３）とを備えた
メタルシール構造において、前記オス側テーパ部（３）
は、前記メス側テーパ部（２４）のテーパ角度と実質的
に等しい第一テーパ角度（Θ1 ）をなして前記メス側テ
ーパ部（２４）の途中部までと接触する先端側の第一テ
ーパ部（４）と、前記メス側テーパ部（２４）のテーパ
角度より実質的に小さい第二テーパ角度（Θ2 ）をなし
て前記メス側テーパ部（２４）の途中部から次第に離れ
る拡径側の第二テーパ部（５）との２段テーパ構造に形
成され、前記第一テーパ部（４）と第二テーパ部（５）
との境界部にＲ面取り部（６）が加工され、前記雄ねじ
部（２）を雌ねじ穴（２３）に螺合して締付けると、そ
の締付けにより発生する軸力で、前記第一テーパ部
（４）がメス側テーパ部（２４）に食い込んで密に接触
し、高圧燃料（２２）の漏れを防ぎ、また、前記境界部
がメス側テーパ部（２４）の凹円錐面の途中部に接触す
ることになるが、該境界部にはＲ面取り部（６）が加工
されているため応力集中が起こらず、焼付・かじりを防
止し、また、前記第二テーパ部（５）が拡径して徐々に
太くなっているので、オス側テーパ部（３）の剛性を低
下させないことを特徴としている。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fuel injection system for an automobile diesel engine.
Provided at the connection part of the system , the male screw part (2) and the female screw hole
A metal conical female-side tapered portion (24) and a metal convex conical male-side tapered portion (3) that come into close contact with each other by an axial force generated by tightening with (23). In the metal seal structure provided, the male tapered portion (3)
Is a first taper portion on the distal end side which makes a first taper angle (Θ1) substantially equal to the taper angle of the knife side taper portion (24) and contacts up to the middle of the knife side taper portion (24). And (4) a second taper angle (Θ2) substantially smaller than the taper angle of the knife-side tapered portion (24) to form a second tapered portion on the diameter-expanding side that gradually moves away from the middle of the knife-side tapered portion (24). The first taper (4) and the second taper (5) are formed in a two-stage taper structure with a two taper (5).
R chamfered portion (6) is processed at the boundary between the external thread
When the part (2) is screwed into the female screw hole (23) and tightened,
The first taper portion by the axial force generated by tightening
(4) bites into the female side taper (24) and makes close contact
To prevent high pressure fuel (22) from leaking,
Contacts the middle of the concave conical surface of the female-side tapered portion (24)
However, an R chamfer (6) is machined at the boundary.
Prevents stress concentration and prevents seizure and galling.
And the second tapered portion (5) expands in diameter and gradually
The rigidity of the male-side tapered portion (3) is low because it is thick
It is characterized by not being let down .
【００１１】ここで、「実質的に等しい」とは、メス側
テーパ部のテーパ角度とオス側テーパ部の第一テーパ角
度とが接触前に略等しい場合のみならず、接触後の締付
け時に弾性変形によって略等しくなるように、接触前に
若干の角度差を設けた場合も含まれる。また、「実質的
に小さい」とは、前記第一テーパ部がメス側テーパ部に
接触して弾性変形した時でも、第二テーパ部がメス側テ
ーパ部から実質的に離れるのに必要な角度差があること
を意味する。Here, "substantially equal" means not only that the taper angle of the female side taper portion and the first taper angle of the male side taper portion are substantially equal to each other before the contact, but also to the elasticity at the time of the tightening after the contact. This includes the case where a slight angle difference is provided before the contact so that they become substantially equal by the deformation. Further, "substantially small" means that even when the first tapered portion comes into contact with the female side tapered portion and is elastically deformed, the angle required for the second tapered portion to be substantially separated from the female side tapered portion. It means there is a difference.
【００１２】[0012]
【発明の実施の形態】以下、本発明を実施した形態例に
ついて、図面を参照して説明する。なお、本形態例の実
施部位は、従来の形態例と同じく、自動車用ディーゼル
エンジンの燃料噴射系の途中部におけるブロックと圧力
センサとの接続部である。Embodiments of the present invention will be described below with reference to the drawings. In addition, the implementation part of this embodiment is the connection part of the block and the pressure sensor in the middle part of the fuel injection system of the automotive diesel engine like the conventional embodiment.
【００１３】図１及び図２に示す金属製のブロック２０
には、高圧燃料（軽油）２２が流動する燃料流路２１が
形成されるとともに、該燃料流路２１と直交する方向
に、圧力センサ１を接続するための雌ねじ穴２３が形成
されている。雌ねじ穴２３の底面から燃料流路２１側に
向かっては、該底面における最大径Ａから燃料流路２１
側ほど縮径した凹円錐面状のメス側テーパ部２４が形成
されている。メス側テーパ部２４の終端には断面円型の
連通穴２５が連続し、燃料流路２１に連通している。The metal block 20 shown in FIGS. 1 and 2
A fuel passage 21 through which high-pressure fuel (light oil) 22 flows is formed, and a female screw hole 23 for connecting the pressure sensor 1 is formed in a direction orthogonal to the fuel passage 21. From the bottom surface of the female screw hole 23 toward the fuel passage 21 side, the fuel passage 21
A concave conical female-side tapered portion 24 having a diameter reduced toward the side is formed. A communication hole 25 having a circular cross section is continuous with the end of the female-side tapered portion 24 and communicates with the fuel flow path 21.
【００１４】圧力センサ１は、高圧燃料２２の圧力を測
定するためのもので、ブロック２０の雌ねじ穴２３に螺
合される金属製の雄ねじ部２と、雄ねじ部２の先端面に
連続し、先端側ほど縮径した金属製で凸円錐面状のオス
側テーパ部３とを備える。オス側テーパ部３は、メス側
テーパ部２４のテーパ角度と実質的に等しい第一テーパ
角度Θ1 をなしてメス側テーパ部２４の途中部までと接
触する先端側の第一テーパ部４と、メス側テーパ部２４
のテーパ角度より実質的に小さい第二テーパ角度Θ2 を
なしてメス側テーパ部２４の途中部から次第に離れる拡
径側の第二テーパ部５との２段テーパ構造に形成されて
いる。The pressure sensor 1 is for measuring the pressure of the high-pressure fuel 22, and is connected to a metal external thread 2 screwed into the internal thread 23 of the block 20 and a front end face of the external thread 2. It is provided with a male-side tapered portion 3 having a convex conical surface and made of metal whose diameter is reduced toward the distal end. The male-side taper portion 3 has a first taper angle Θ1 substantially equal to the taper angle of the female-side taper portion 24, and contacts the first taper portion 4 on the distal end side that contacts the middle of the female-side taper portion 24; Female side taper part 24
Is formed in a two-step taper structure with the second taper portion 5 on the diameter-increase side gradually forming a second taper angle Θ2 smaller than the taper angle of the second taper portion 24 and gradually separating from the middle part of the female side taper portion 24.
【００１５】ここで、「実質的に等しい」とは、メス側
テーパ部２４のテーパ角度と第一テーパ角度Θ1 とが接
触前に略等しい場合のみならず、接触後の締付け時に弾
性変形によって略等しくなるように、接触前に第一テー
パ角度Θ1 の方を１〜２度小さく設定した場合も含まれ
る。また、「実質的に小さい」とは、第一テーパ部４が
メス側テーパ部２４に接触して弾性変形した時でも、第
二テーパ部５がメス側テーパ部２４から実質的に離れる
のに必要な角度差があることを意味する。Here, "substantially equal" means not only when the taper angle of the female-side tapered portion 24 and the first taper angle Θ1 are substantially equal before the contact, but also substantially by elastic deformation at the time of the tightening after the contact. This includes the case where the first taper angle Θ1 is set to be smaller by 1 to 2 degrees before the contact so as to be equal. Further, “substantially small” means that even when the first tapered portion 4 comes into contact with the female side tapered portion 24 and is elastically deformed, the second tapered portion 5 is substantially separated from the female side tapered portion 24. It means that there is a necessary angle difference.
【００１６】第一テーパ部４と第二テーパ部５との境界
部の径はＢであって、該境界部にはＲ面取り部６が加工
されている。The diameter of the boundary between the first tapered portion 4 and the second tapered portion 5 is B, and an R-chamfered portion 6 is machined at the boundary.
【００１７】ブロック２０と圧力センサ１との間は、メ
ス側テーパ部２４とオス側テーパ部３とによるメタルシ
ール構造によってシールされている。すなわち、雄ねじ
部２を雌ねじ穴２３に螺合して締付けると、その締付け
により発生する軸力で、金属製のオス側テーパ部３の第
一テーパ部４がメス側テーパ部２４に食い込んで密に接
触し、高圧燃料２２の漏れを防ぐのである。The space between the block 20 and the pressure sensor 1 is sealed by a metal seal structure composed of a female taper portion 24 and a male taper portion 3. That is, when the male screw portion 2 is screwed into the female screw hole 23 and tightened, the axial force generated by the tightening causes the first taper portion 4 of the metal male taper portion 3 to bite into the female side taper portion 24 and tightly close. To prevent leakage of the high-pressure fuel 22.
【００１８】本発明のメタルシール構造によれば、第一
テーパ部４の最大径Ｂにおける角部がメス側テーパ部２
４の凹円錐面の途中部に接触することになるが、該角部
にはＲ面取り部６が加工されているため応力集中が起こ
らず、焼付・かじりを防止することができる。また、第
二テーパ部５の最小径はＢと小さいが、雄ねじ部２側ほ
ど拡径して徐々に太くなっているので、オス側テーパ部
３の剛性を低下させる心配もない。さらに、オス側テー
パ部３を２段テーパ構造とする加工や、Ｒ面取り部６の
加工は、圧力センサ１の外部における作業となるため、
工法上の制約が少なく、容易である。According to the metal seal structure of the present invention, the corner of the first tapered portion 4 at the maximum diameter B is the female side tapered portion 2.
Although it comes into contact with the middle part of the concave conical surface of No. 4, stress concentration does not occur because the R-chamfered portion 6 is processed at the corner, and seizure and galling can be prevented. Further, the minimum diameter of the second tapered portion 5 is as small as B, but since the diameter increases gradually toward the male screw portion 2 side, the rigidity of the male tapered portion 3 is not reduced. Furthermore, since the processing of forming the male-side tapered portion 3 into a two-stage tapered structure and the processing of the R chamfered portion 6 are performed outside the pressure sensor 1,
There are few restrictions on the construction method and it is easy.
【００１９】なお、本発明は上記実施形態に限定される
ものではなく、例えば次のように発明の趣旨から逸脱し
ない範囲で適宜変更して具体化することもできる。 （１）上記形態例では、本発明を、燃料噴射系の途中部
におけるブロック２０と圧力センサ１との接続部に具体
化しているが、噴射ノズルとシリンダヘッドとの接続部
に具体化してもよい。この場合、シリンダヘッドの内周
面にメス側テーパ部が形成され、噴射ノズルの外周面に
オス側テーパ部が形成され、噴射ノズルから噴射される
高圧燃料の漏れが防止される。 The present invention is not limited to the above-described embodiment, but may be embodied with appropriate modifications without departing from the spirit of the invention, for example, as follows. (1) In the above embodiment, the present invention is embodied in the connection part between the block 20 and the pressure sensor 1 in the middle of the fuel injection system, but may be embodied in the connection part between the injection nozzle and the cylinder head. Good. In this case, the female-side tapered portion on the inner peripheral surface of the cylinder head is formed, the injection male tapered portion on the outer peripheral surface of the nozzle is formed, leakage of high pressure fuel injected from the injection nozzle Ru is prevented.
【００２０】[0020]
【発明の効果】本発明の自動車用ディーゼルエンジンの
燃料噴射系のメタルシール構造は、上記の通り構成され
ているので、焼付・かじりが生じにくいだけでなく、加
工の制約も少なく、剛性を低下させることもないという
優れた効果を奏する。The automobile diesel engine of the present invention
Since the metal seal structure of the fuel injection system is configured as described above, not only seizure and galling does not easily occur, but also there is an excellent effect that there are few restrictions on processing and no reduction in rigidity.
【図１】本発明の実施形態に係る自動車用ディーゼルエ
ンジンの燃料噴射系のメタルシール構造の断面図であ
る。FIG. 1 is an automobile diesel engine according to an embodiment of the present invention.
It is sectional drawing of the metal seal structure of the fuel injection system of a engine .
【図２】同構造の要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of the structure.
【図３】従来の自動車用ディーゼルエンジンの燃料噴射
系のメタルシール構造の断面図である。FIG. 3 shows fuel injection of a conventional automobile diesel engine.
It is sectional drawing of a metal seal structure of a system .
【図４】同構造の要部拡大断面図である。FIG. 4 is an enlarged sectional view of a main part of the structure.
【図５】従来の別のメタルシール構造を示す要部拡大断
面図である。FIG. 5 is an enlarged sectional view of a main part showing another conventional metal seal structure.
【図６】従来の別のメタルシール構造を示す要部拡大断
面図である。FIG. 6 is an enlarged sectional view of a main part showing another conventional metal seal structure.
１ 圧力センサ ３ オス側テーパ部 ４ 第一テーパ部 ５ 第二テーパ部 ６ Ｒ面取り部 ２０ ブロック ２１ 燃料流路 ２４ メス側テーパ部 Θ1 第一テーパ角度 Θ2 第二テーパ角度 DESCRIPTION OF SYMBOLS 1 Pressure sensor 3 Male side taper part 4 First taper part 5 Second taper part 6 R chamfered part 20 Block 21 Fuel flow path 24 Female side taper part Θ1 First taper angle Θ2 Second taper angle
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 平６−49888（ＪＰ，Ｕ) 実開 平２−104856（ＪＰ，Ｕ) 特表 平３−502958（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01L 19/00 101 F02M 55/02 330 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 6-49888 (JP, U) JP-A 2-104856 (JP, U) Tables 3-502958 (JP, A) (58) Survey Field (Int.Cl. 7 , DB name) G01L 19/00 101 F02M 55/02 330
Claims (1)
系の接続部に設けられて、雄ねじ部（２）と雌ねじ穴
（２３）との締付けにより発生する軸力で互いに密に接
触する金属製の凹円錐面状のメス側テーパ部（２４）と
金属製の凸円錐面状のオス側テーパ部（３）とを備えた
メタルシール構造において、 前記オス側テーパ部（３）は、前記メス側テーパ部（２
４）のテーパ角度と実質的に等しい第一テーパ角度（Θ
1 ）をなして前記メス側テーパ部（２４）の途中部まで
と接触する先端側の第一テーパ部（４）と、前記メス側
テーパ部（２４）のテーパ角度より実質的に小さい第二
テーパ角度（Θ2 ）をなして前記メス側テーパ部（２
４）の途中部から次第に離れる拡径側の第二テーパ部
（５）との２段テーパ構造に形成され、前記第一テーパ
部（４）と第二テーパ部（５）との境界部にＲ面取り部
（６）が加工され、前記雄ねじ部（２）を雌ねじ穴（２３）に螺合して締付
けると、その締付けにより発生する軸力で、前記第一テ
ーパ部（４）がメス側テーパ部（２４）に食い込んで密
に接触し、高圧燃料（２２）の漏れを防ぎ、また、前記
境界部がメス側テーパ部（２４）の凹円錐面の途中部に
接触することになるが、該境界部にはＲ面取り部（６）
が加工されているため応力集中が起こらず、焼付・かじ
りを防止し、また、前記第二テーパ部（５）が拡径して
徐々に太くなっているので、オス側テーパ部（３）の剛
性を低下させないことを特徴とする自動車用ディーゼル
エンジンの燃料噴射系 のメタルシール構造。1. A fuel injection system for an automobile diesel engine.
Provided at the connection part of the system , the male screw part (2) and the female screw hole
A metal conical female-side tapered portion (24) and a metal convex conical male-side tapered portion (3) that come into close contact with each other by an axial force generated by tightening with (23). In the metal seal structure provided, the male-side tapered portion (3) is provided with the female-side tapered portion (2).
4) that is substantially equal to the first taper angle (と).
1) The first tapered portion (4) on the distal end side which contacts the knife-side tapered portion (24) to form a second portion substantially smaller than the taper angle of the knife-side tapered portion (24). At the taper angle (Θ2), the female side taper portion (2
4) It is formed in a two-stage tapered structure with a second tapered portion (5) on the enlarged diameter side gradually separated from the middle part of 4), and at a boundary portion between the first tapered portion (4) and the second tapered portion (5). The R chamfered part (6) is machined, and the male screw part (2) is screwed into the female screw hole (23) and tightened.
The first force is reduced by the axial force generated by the tightening.
The taper part (4) cuts into the female side taper part (24)
To prevent leakage of the high pressure fuel (22), and
The boundary part is in the middle of the concave conical surface of the female side taper part (24).
Although it comes into contact, the boundary portion has an R chamfer (6)
Is processed, stress concentration does not occur,
And the second tapered portion (5) expands in diameter.
Since it gradually becomes thicker, the rigidity of the male taper (3)
Diesel for automobiles, which does not reduce the durability
Metal seal structure for engine fuel injection system .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03989297A JP3337391B2 (en) | 1997-02-07 | 1997-02-07 | Metal seal structure for fuel injection system of automotive diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03989297A JP3337391B2 (en) | 1997-02-07 | 1997-02-07 | Metal seal structure for fuel injection system of automotive diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10221192A JPH10221192A (en) | 1998-08-21 |
| JP3337391B2 true JP3337391B2 (en) | 2002-10-21 |
Family
ID=12565627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03989297A Expired - Lifetime JP3337391B2 (en) | 1997-02-07 | 1997-02-07 | Metal seal structure for fuel injection system of automotive diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3337391B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3789691B2 (en) * | 1999-09-14 | 2006-06-28 | 三洋電機株式会社 | High pressure compressor compressor |
| JP4815455B2 (en) * | 2008-01-21 | 2011-11-16 | 日立オートモティブシステムズ株式会社 | Fuel pump |
| DE102009002990A1 (en) * | 2009-05-11 | 2010-11-18 | Robert Bosch Gmbh | High pressure sensor |
| JP5340184B2 (en) * | 2010-01-19 | 2013-11-13 | 株式会社デンソー | High pressure fuel injection pipe seal pin |
| JP5525051B2 (en) * | 2011-04-15 | 2014-06-18 | 日本特殊陶業株式会社 | Glow plug |
| GB201401328D0 (en) * | 2014-01-27 | 2014-03-12 | Delphi Int Operations Luxembourg Sarl | Seal arrangement for a fuel injector actuator |
| JP2016090302A (en) * | 2014-10-31 | 2016-05-23 | 株式会社鷺宮製作所 | Liquid detection unit, compressor and air conditioner |
-
1997
- 1997-02-07 JP JP03989297A patent/JP3337391B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10221192A (en) | 1998-08-21 |
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