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JP4985630B2 - Mounting structure of fuel injection valve - Google Patents

Mounting structure of fuel injection valve Download PDF

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Publication number
JP4985630B2
JP4985630B2 JP2008316184A JP2008316184A JP4985630B2 JP 4985630 B2 JP4985630 B2 JP 4985630B2 JP 2008316184 A JP2008316184 A JP 2008316184A JP 2008316184 A JP2008316184 A JP 2008316184A JP 4985630 B2 JP4985630 B2 JP 4985630B2
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fuel injection
injection valve
diameter
washer
drop
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JP2010138810A (en
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義智 小熊
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Denso Corp
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Denso Corp
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Description

本発明は、車両エンジンに燃料を噴射する燃料噴射弁(インジェクタ)のエンジンに対する取付け構造に関するものであり、特に、軸ズレ吸収ワッシャの抜け止めに使用する脱落防止リングのエンジン側への脱落防止を実現したものである。   The present invention relates to a structure for mounting a fuel injection valve (injector) for injecting fuel into a vehicle engine to the engine, and in particular, to prevent a drop-off prevention ring used for preventing a shaft displacement absorbing washer from falling off to the engine side. It has been realized.

車両エンジンに燃料を噴射する燃料噴射弁のエンジンのシリンダヘッドに対する取付け構造において、フューエルレールとシリンダヘッドの軸ずれに起因する燃料噴射弁の傾きに対して対策したものとして、特許文献1が知られている。   Patent Document 1 is known as a countermeasure against the inclination of the fuel injection valve caused by the misalignment of the fuel rail and the cylinder head in the structure for mounting the fuel injection valve for injecting fuel to the vehicle engine to the cylinder head of the engine. ing.

この特許文献1は、図4に示す様に、軸ズレ吸収ワッシャ17となる調心リングを燃料噴射弁1のハウジングの傾斜部分12に接触させるものである。そして、燃料噴射弁1が傾いて取付けられた場合に、軸ズレ吸収ワッシャ17と傾斜部分12とが円弧30aに沿う接触部30bで相対的に摺動しながら、軸ズレ吸収ワッシャ17が径方向にスライドする。こうして、燃料噴射弁1がシリンダヘッドに対して片あたりするのを抑制するものが知られている。   In this patent document 1, as shown in FIG. 4, an alignment ring serving as a shaft displacement absorbing washer 17 is brought into contact with the inclined portion 12 of the housing of the fuel injection valve 1. When the fuel injection valve 1 is mounted at an inclination, the axial deviation absorbing washer 17 and the inclined part 12 slide relative to each other at the contact portion 30b along the arc 30a, while the axial deviation absorbing washer 17 is in the radial direction. Slide to. In this way, there is known one that suppresses the fuel injection valve 1 from hitting the cylinder head.

この公知の構造は、燃料噴射弁1の周囲に軸ズレ吸収ワッシャ17を取付けてから、エンジンのシリンダヘッドの取付け孔3内に燃料噴射弁1を挿入するときに、軸ズレ吸収ワッシャ17が脱落して取付け孔3内に落ちることを防止するために、軸ズレ吸収ワッシャ17を反エンジン側から吊り下げるストッパ(脱落防止部)17aとリング部材51aを備えるものである。
特許第4034762号公報
In this known structure, when the shaft displacement absorbing washer 17 is attached around the fuel injection valve 1, the shaft displacement absorbing washer 17 is dropped when the fuel injection valve 1 is inserted into the mounting hole 3 of the cylinder head of the engine. In order to prevent falling into the mounting hole 3, a stopper (drop-off prevention portion) 17 a and a ring member 51 a for suspending the shaft displacement absorbing washer 17 from the non-engine side are provided.
Japanese Patent No. 4034662

ところが、上記ストッパ(脱落防止部)17aは、軸ズレ吸収ワッシャ17に連結され、構造的に複雑になり、軸ズレ吸収ワッシャ17の調心作用の要となる径方向へのスライド作用を阻害する可能性もある。   However, the stopper (drop-off prevention part) 17a is connected to the shaft misalignment absorbing washer 17, becomes structurally complicated, and inhibits the sliding action in the radial direction, which is necessary for the alignment operation of the shaft misalignment absorbing washer 17. There is a possibility.

本発明は、このような従来の技術に存在する問題点に着目して成されたものであり、その目的は、軸ズレ吸収ワッシャが脱落して取付け孔内に落ちることを防止するための脱落防止リング自体の脱落も防止できて、構造的に複雑にならない燃料噴射弁の取付け構造を得ることにある。   The present invention has been made paying attention to such problems existing in the prior art, and its purpose is to prevent the shaft displacement absorbing washer from falling off and falling into the mounting hole. An object of the present invention is to provide a fuel injection valve mounting structure that can prevent the prevention ring itself from falling off and is not structurally complicated.

本発明は上記目的を達成するために、下記の技術的手段を採用する。すなわち、請求項1に記載の発明では、燃料噴射弁(1)をエンジン(2)の取付け孔(3)に取付ける燃料噴射弁(1)の組付け構造であって、燃料噴射弁(1)の反エンジン側は、燃料配管(4)に結合されており、燃料噴射弁(1)は外径の大きさが異なるハウジング部分の間に傾斜部分(12)を有し、燃料噴射弁(1)は、取付け孔(3)に対して加圧され、該加圧力を軸ズレ吸収ワッシャ(17)で受け、該軸ズレ吸収ワッシャ(17)は、傾斜部分(12)に位置し、取付け孔(3)は、軸ズレ吸収ワッシャ(17)を受けるワッシャ受け部(26)を有する段部(25)を有し、燃料噴射弁(1)の傾斜部分(12)と軸ズレ吸収ワッシャ(17)の反エンジン側に設けられた当接点(30、31)とが接触して、燃料噴射弁(1)が傾いて取付け孔(3)に取付けられたときに、軸ズレ吸収ワッシャ(17)は、傾斜部分(12)と対向する段部(25)のワッシャ受け部(26)を摺動し、軸ズレ吸収ワッシャ(17)のエンジン側に軸ズレ吸収ワッシャ(17)のエンジン側への脱落を防止する脱落防止リング(51)がハウジング部分の外周に形成された溝部(50)に嵌挿されており、溝部(50)のエンジン側に形成された隆起部(53)によって脱落防止リング(51)のエンジン側への脱落を防止し、脱落防止リング(51)が隆起部(53)を乗り越えようとしたときに、隆起部(53)と径方向に対向する取付け孔(3)の内壁に、脱落防止リング(51)が当接することを特徴としている。   In order to achieve the above object, the present invention employs the following technical means. That is, the invention according to claim 1 is an assembly structure of the fuel injection valve (1) in which the fuel injection valve (1) is attached to the attachment hole (3) of the engine (2). The side opposite to the engine is coupled to the fuel pipe (4), and the fuel injection valve (1) has an inclined portion (12) between the housing portions having different outer diameters. ) Is pressurized against the mounting hole (3) and receives the applied pressure by the shaft misalignment absorbing washer (17). The shaft misalignment absorbing washer (17) is located at the inclined portion (12), and the mounting hole (3) includes a step portion (25) having a washer receiving portion (26) for receiving a shaft displacement absorbing washer (17), and an inclined portion (12) of the fuel injection valve (1) and a shaft displacement absorbing washer (17). ) And the contact point (30, 31) provided on the side opposite to the engine comes into contact with the fuel injection When (1) is inclined and attached to the attachment hole (3), the shaft misalignment absorbing washer (17) slides on the washer receiving portion (26) of the step portion (25) facing the inclined portion (12). A slip-off prevention ring (51) for preventing the shaft-shift absorbing washer (17) from dropping off to the engine side is fitted in a groove (50) formed on the outer periphery of the housing portion. The drop-off prevention ring (51) is prevented from falling off to the engine side by the raised part (53) formed on the engine side of the groove part (50), and the drop-off prevention ring (51) is raised. The drop-off prevention ring (51) is brought into contact with the inner wall of the mounting hole (3) which is opposed to the raised portion (53) in the radial direction.

この請求項1に記載の発明によれば、脱落防止リング(51)がエンジン側に脱落するためには、溝部(50)のエンジン側に形成された隆起部(53)を乗り越えなければならない。そして隆起部(53)を乗り越えたと仮定したときに、隆起部(53)と径方向に対向する取付け孔(3)内壁に、脱落防止リング(51)が当接する寸法関係としたから、脱落防止リング(51)の先端が隆起部(53)を乗り越えようとしても、脱落防止リング(51)の先端が取付け孔(3)の内壁となる溝部対向壁面に接触してしまう。よって、脱落防止リング(51)が隆起部(53)を乗り越えてエンジン側に脱落するのが阻止できる。   According to the first aspect of the present invention, in order for the drop-off prevention ring (51) to drop off to the engine side, it is necessary to get over the raised portion (53) formed on the engine side of the groove (50). Then, when it is assumed that the ridge (53) has been overcome, the detachment prevention ring (51) comes into contact with the inner wall of the mounting hole (3) that faces the ridge (53) in the radial direction. Even if the tip of the ring (51) tries to get over the raised portion (53), the tip of the drop-off prevention ring (51) comes into contact with the groove-facing wall surface that is the inner wall of the mounting hole (3). Therefore, it is possible to prevent the drop prevention ring (51) from falling over the ridge (53) to the engine side.

次に、請求項2に記載の発明は、溝部(50)の底面から隆起部(95)と径方向に対面する取付け孔(3)の内壁迄の寸法をL1とし、溝部(50)の底面から脱落防止リング(51)の径方向最外端までの寸法をD2とし、溝部(50)の底面から隆起部(53)先端までの寸法をL3としたとき、L1<D2+L3の数式を満たすことを特徴としている。   Next, in the invention described in claim 2, the dimension from the bottom surface of the groove portion (50) to the inner wall of the mounting hole (3) facing the raised portion (95) in the radial direction is L1, and the bottom surface of the groove portion (50). When the dimension from the bottom end of the drop-off prevention ring (51) to the radially outermost end is D2, and the dimension from the bottom surface of the groove (50) to the tip of the raised part (53) is L3, the formula L1 <D2 + L3 is satisfied. It is characterized by.

この請求項2に記載の発明によれば、脱落防止リング(51)がエンジン側に脱落するためには、溝部(50)のエンジン側に形成された隆起部(53)を乗り越えなければならない。そして隆起部(53)を乗り越えたと仮定したときの溝部(50)の底面(基準面)から隆起部(53)を乗り越えた脱落防止リング(51)の先端までの寸法は、溝部(50)の底面から隆起部(53)先端までの寸法L3に脱落防止リング(51)の断面部外径寸法D2を加えたもの(D2+L3)と成る。ところが、溝部(50)の底面(基準面)から取付け孔(3)の内壁(隆起部対向壁面)迄の寸法がL1であるから、L1<D2+L3の数式を満たす場合には、脱落防止リング(51)が隆起部(53)を乗り越えたときに、前記脱落防止リング(51)の最外径部先端が前記取付け孔(3)の内壁に接触してしまい、脱落防止リング(51)が隆起部(53)を乗り越えてエンジン側に脱落するのが阻止できる。   According to the second aspect of the present invention, in order for the drop-off prevention ring (51) to drop off to the engine side, it has to get over the raised portion (53) formed on the engine side of the groove (50). The dimension from the bottom surface (reference surface) of the groove portion (50) to the tip of the drop-off prevention ring (51) over the protrusion portion (53) when it is assumed that the ridge portion (53) has been overcome is the size of the groove portion (50). This is a dimension (D2 + L3) obtained by adding the outer diameter dimension D2 of the cross section of the drop-off prevention ring (51) to the dimension L3 from the bottom surface to the tip of the raised portion (53). However, since the dimension from the bottom surface (reference surface) of the groove portion (50) to the inner wall (wall surface facing the raised portion) of the mounting hole (3) is L1, when the mathematical expression L1 <D2 + L3 is satisfied, the drop prevention ring ( When 51) gets over the raised portion (53), the tip of the outermost diameter portion of the drop-off prevention ring (51) comes into contact with the inner wall of the mounting hole (3), and the drop-off prevention ring (51) is raised. It is possible to prevent the engine from falling over the part (53) to the engine side.

次に、請求項3に記載の発明は、軸ズレ吸収ワッシャ(17)の内周径は、脱落防止リング(51)の外周径よりも小さいことを特徴としている。   Next, the invention according to claim 3 is characterized in that the inner peripheral diameter of the shaft displacement absorbing washer (17) is smaller than the outer peripheral diameter of the drop-off preventing ring (51).

この請求項3に記載の発明によれば、燃料噴射弁(1)の外周に軸ズレ吸収ワッシャ(17)を挿入したあとで、軸ズレ吸収ワッシャ(17)が、燃料噴射弁(1)から脱落しようとしても、軸ズレ吸収ワッシャ(17)の内周が脱落防止リング(51)の外周に係合して、脱落を確実に阻止できる。また、特別に軸ズレ吸収ワッシャ(17)と脱落防止リング(51)とを連結する連結部材は不要となる。   According to the third aspect of the present invention, the shaft misalignment absorbing washer (17) is inserted from the fuel injection valve (1) after the shaft misalignment absorbing washer (17) is inserted into the outer periphery of the fuel injection valve (1). Even if it is about to drop off, the inner periphery of the shaft misalignment absorbing washer (17) engages with the outer periphery of the dropout prevention ring (51), so that the dropout can be reliably prevented. In addition, a connecting member that connects the shaft displacement absorbing washer (17) and the drop-off prevention ring (51) is not required.

次に、請求項4に記載の発明は、燃料噴射弁(1)の駆動回路は大径部(8)を成すハウジング部分に収納され、燃料噴射弁(1)の弁部は小径部(9)を成すノズル部に収納され、小径部(9)と大径部(8)の間に中径部(10)が設けられ、軸ズレ吸収ワッシャ(17)は、大径部(8)と中径部(10)との間の傾斜部分(12)となる大径部傾斜部分(12)に位置し、取付け孔(3)は、小径部(9)を成すノズル部が挿入される小径孔部(20)と、中径部(10)が挿入される中径孔部(21)と、大径部(8)が挿入される大径孔部(22)を有し、大径孔部(22)と中径孔部(21)の間には軸ズレ吸収ワッシャ(17)を受けるワッシャ受け部(26)を有する段部(25)が存在し、燃料噴射弁(1)の大径部傾斜部分(12)と軸ズレ吸収ワッシャ(17)の反エンジン側に設けられた当接点(30、31)とが接触していることを特徴としている。   Next, according to a fourth aspect of the present invention, the drive circuit for the fuel injection valve (1) is housed in the housing portion that forms the large diameter portion (8), and the valve portion of the fuel injection valve (1) is the small diameter portion (9). ), A medium diameter part (10) is provided between the small diameter part (9) and the large diameter part (8), and the axial displacement absorbing washer (17) is connected to the large diameter part (8). Located in the large-diameter portion inclined portion (12) that becomes the inclined portion (12) between the intermediate-diameter portion (10), the mounting hole (3) has a small diameter into which the nozzle portion constituting the small-diameter portion (9) is inserted. It has a hole (20), a medium diameter hole (21) into which the medium diameter part (10) is inserted, and a large diameter hole (22) into which the large diameter part (8) is inserted. A step portion (25) having a washer receiving portion (26) for receiving an axial displacement absorbing washer (17) exists between the portion (22) and the medium diameter hole portion (21), and the fuel injection valve (1) is large. Diameter inclination It is characterized in that portions (12) at a contact point (30, 31) provided on the opposite side to the engine axis misalignment absorbing washer (17) and is in contact.

この請求項4に記載の発明によれば、大径部(8)を成すハウジング部は駆動回路を収納するため、外径が大きい。一方、小径部(9)を成すノズル部は機能上外径が細い。よって、小径部(9)と大径部(8)の間の中径部(10)の大きさは、所要の大きさを持つ脱落防止リング(51)を溝部(50)内に収納する程度の大きさに設定し易い。換言すれば、大径部(8)と小径部(9)との径の差が大きいから、大径部(8)と小径部(9)との間の空間内に、所要の大きさを持つ脱落防止リング(51)を容易に取付けることが出来る。   According to the fourth aspect of the present invention, since the housing part forming the large diameter part (8) accommodates the drive circuit, the outer diameter is large. On the other hand, the nozzle portion forming the small diameter portion (9) has a thin outer diameter in terms of function. Therefore, the size of the medium diameter portion (10) between the small diameter portion (9) and the large diameter portion (8) is such that the drop prevention ring (51) having a required size is accommodated in the groove portion (50). Easy to set the size of. In other words, since the difference in diameter between the large diameter portion (8) and the small diameter portion (9) is large, the required size is set in the space between the large diameter portion (8) and the small diameter portion (9). The drop-off prevention ring (51) can be easily attached.

次に、請求項5記載の発明では、軸ズレ吸収ワッシャ(17)はリング状の金属よりなり、脱落防止リング(51)は溝部(50)内に嵌入されたC字型の金属リングから成ることを特徴としている。   Next, in the invention described in claim 5, the shaft misalignment absorbing washer (17) is made of a ring-shaped metal, and the drop-off preventing ring (51) is made of a C-shaped metal ring fitted in the groove (50). It is characterized by that.

この請求項5に記載の発明によれば、燃料噴射弁(1)の外周に軸ズレ吸収ワッシャ(17)を挿入したあとで、燃料噴射弁(1)の外周に形成された溝部(50)内に前記燃料噴射弁(1)の軸心と直交する径方向からC字型の金属リングから成る前記脱落防止リング(51)を溝部(50)内に嵌入できる。   According to the fifth aspect of the present invention, the groove (50) formed on the outer periphery of the fuel injection valve (1) after the shaft displacement absorbing washer (17) is inserted into the outer periphery of the fuel injection valve (1). The drop-off prevention ring (51) made of a C-shaped metal ring can be fitted into the groove (50) from the radial direction perpendicular to the axis of the fuel injection valve (1).

次に、請求項6に記載の発明では、大径傾斜部分(12)の下面から溝部(50)までの寸法(L4)を軸ズレ吸収ワッシャ(17)の軸方向高さ(L5)より小さくしたことを特徴としている。   Next, in the invention described in claim 6, the dimension (L4) from the lower surface of the large-diameter inclined portion (12) to the groove (50) is smaller than the axial height (L5) of the axial displacement absorbing washer (17). It is characterized by that.

この請求項6に記載の発明によれば、軸ズレ吸収ワッシャ(17)の向きが逆向きで、燃料噴射弁(1)に挿入されている場合には、脱落防止リング(51)が、軸ズレ吸収ワッシャ(17)と干渉して、溝部(50)内に挿入し難い。従って、脱落防止リング(51)が溝部(50)に嵌入されるときに、軸ズレ吸収ワッシャ(17)の逆向き取付けが発見し易い。   According to the sixth aspect of the present invention, when the shaft misalignment absorbing washer (17) is in the reverse direction and is inserted into the fuel injection valve (1), the drop-off prevention ring (51) is It is difficult to insert into the groove (50) by interfering with the displacement absorbing washer (17). Therefore, when the drop-off prevention ring (51) is fitted into the groove (50), it is easy to find the reverse mounting of the shaft misalignment absorbing washer (17).

なお、特許請求の範囲および上記各手段に記載の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示す一例である。   In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(第1実施形態)
以下、本発明の第1実施形態について図1及び図2を用いて詳細に説明する。図1は、燃料噴射弁1がエンジン2のシリンダヘッドの取付け孔3に正しく取付けられた状態を示す主に燃料噴射弁1の正面図、図2は、上記燃料噴射弁1の取付け構造の要部拡大図である。
(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a front view of the fuel injection valve 1 mainly showing a state in which the fuel injection valve 1 is correctly installed in the mounting hole 3 of the cylinder head of the engine 2, and FIG. 2 shows the essential structure of the fuel injection valve 1 mounting structure. FIG.

燃料噴射弁1の上部は、金属製の燃料配管4を成すフューエルレールにOリング5を介して圧入されている。なお、Oリング5は、圧入され変形する前の状態を図示している。また、コネクタ6を介して電気信号が燃料噴射弁1に導入されている。   The upper portion of the fuel injection valve 1 is press-fitted through an O-ring 5 into a fuel rail that forms a metal fuel pipe 4. The O-ring 5 is shown in a state before being press-fitted and deformed. In addition, an electrical signal is introduced into the fuel injection valve 1 via the connector 6.

この電気信号によって、図示されない駆動回路を成す磁気回路とバネの働きで燃料噴射弁1内部のニードルが上下方向に動くようになっている。その結果、燃料噴射弁1の下部先端の図示されない弁体を開閉するようになっている。   By this electric signal, the needle inside the fuel injection valve 1 moves in the vertical direction by the action of a magnetic circuit and a spring that form a drive circuit (not shown). As a result, a valve body (not shown) at the lower end of the fuel injection valve 1 is opened and closed.

上記磁気回路を構成する図示されない電磁コイルは、大径部8を成すハウジング部に収納されている。そして、大径部8は、上記電磁コイルの励磁によって流れる磁束の通路(ヨーク)となる。   An electromagnetic coil (not shown) constituting the magnetic circuit is accommodated in a housing portion that forms the large diameter portion 8. The large-diameter portion 8 serves as a magnetic flux passage (yoke) that flows by excitation of the electromagnetic coil.

図示されない弁体は、小径部9を成すノズル部に収納されている。上記小径部9と大径部8の間に中径部10が設けられている。   A valve body (not shown) is accommodated in a nozzle portion that forms the small diameter portion 9. A medium diameter portion 10 is provided between the small diameter portion 9 and the large diameter portion 8.

大径部8には、テーパ部(スロープ部または球面部分でも良い)から成る大径部傾斜部分12が設けられている。中径部10の下方となるエンジン2側には外周に溝部50(図2)を形成してあり、この溝部50の中に、脱落防止リング51となる金属性のC字型リングが嵌入されている。   The large diameter portion 8 is provided with a large diameter portion inclined portion 12 formed of a tapered portion (which may be a slope portion or a spherical portion). A groove 50 (FIG. 2) is formed on the outer periphery of the engine 2 side below the middle diameter portion 10, and a metallic C-shaped ring serving as a drop-off prevention ring 51 is fitted into the groove 50. ing.

フューエルレールを成す燃料配管4内の加圧された燃料により、燃料噴射弁1は、エンジン2の取付け孔3に対して加圧される。この加圧力は、軸ズレ吸収ワッシャ17で受け止められている。   The fuel injection valve 1 is pressurized against the mounting hole 3 of the engine 2 by the pressurized fuel in the fuel pipe 4 constituting the fuel rail. This applied pressure is received by the shaft displacement absorbing washer 17.

軸ズレ吸収ワッシャ17は、金属よりなり、大径部8と中径部10との間の大径部傾斜部分12に当接されていて、リング状の外形を有している。   The shaft misalignment absorbing washer 17 is made of metal, is in contact with the large-diameter portion inclined portion 12 between the large-diameter portion 8 and the medium-diameter portion 10, and has a ring-shaped outer shape.

エンジン2のシリンダヘッドに穿設された取付け孔3は、小径孔部20と中径孔部21と大径孔部22を有している。小径孔部20と中径孔部21の間には、傾斜部27が存在する。また、中径孔部21と大径孔部22の間には、段部25を有する。   The mounting hole 3 drilled in the cylinder head of the engine 2 has a small diameter hole portion 20, a medium diameter hole portion 21, and a large diameter hole portion 22. An inclined portion 27 exists between the small diameter hole portion 20 and the medium diameter hole portion 21. Further, a step portion 25 is provided between the medium diameter hole portion 21 and the large diameter hole portion 22.

この段部25は、半径方向に直線的(平面的)に延在するワッシャ受け部26を有している。このワッシャ受け部26は、軸ズレ吸収ワッシャ17が径方向に直線状に移動できるよう、直線状の平面部から成るが、緩やかな曲面部から成るものであっても良い。   The step portion 25 has a washer receiving portion 26 extending linearly (planarly) in the radial direction. The washer receiving portion 26 is composed of a straight plane portion so that the axial displacement absorbing washer 17 can move linearly in the radial direction, but may be composed of a gently curved portion.

軸ズレ吸収ワッシャ17の断面は、図2のように、大径部傾斜部分12に当接点30及び31で当接する斜面部32(または曲面部32)を持つ。また、軸ズレ吸収ワッシャ17の断面は、実質的に直線状(平面状)のすべり部33と直交壁部34を持つ実質的に直角三角形状である。そして、直交壁部34と、取付け孔3の大径孔部22内周の直交壁35との間には、クリアランス36が設けられている。   The cross section of the shaft misalignment absorbing washer 17 has an inclined surface portion 32 (or a curved surface portion 32) that contacts the large diameter inclined portion 12 at the contact points 30 and 31, as shown in FIG. The cross section of the axial displacement absorbing washer 17 is substantially a right triangle having a linear (planar) sliding portion 33 and an orthogonal wall portion 34. A clearance 36 is provided between the orthogonal wall portion 34 and the orthogonal wall 35 on the inner periphery of the large-diameter hole portion 22 of the attachment hole 3.

燃料噴射弁1が正しく取付けられている図1及び図2の場合は、上記クリアランス36は左右均一に設けられているが、燃料噴射弁1が傾いて取付けられると、上記クリアランス36の一方が、他方に比べて小さくなる。これは、軸ズレ吸収ワッシャ17が径方向に横滑りするためである。   In the case of FIGS. 1 and 2 in which the fuel injection valve 1 is correctly attached, the clearance 36 is provided uniformly on the left and right. However, when the fuel injection valve 1 is attached to be inclined, one of the clearances 36 is Smaller than the other. This is because the shaft misalignment absorbing washer 17 slides in the radial direction.

図1のように、燃料噴射弁1の先端部には、燃焼圧シールのためのガスシール部材40(例えば、四フッ化エチレン樹脂(PTFE)が装着されている。このPTFEは、燃料噴射弁1とシリンダヘッド孔となる小径孔部20との間に圧入されている。上述のような軸ズレ吸収ワッシャ17を介して、取付け孔3内に燃料噴射弁1が嵌合されているため、燃料噴射弁1が傾くとき、ガスシール部材40(PTFE)を回転中心P0として傾く。   1, a gas seal member 40 (for example, tetrafluoroethylene resin (PTFE)) for combustion pressure sealing is attached to the tip of the fuel injection valve 1. This PTFE is a fuel injection valve. 1 and a small-diameter hole portion 20 serving as a cylinder head hole, since the fuel injection valve 1 is fitted into the mounting hole 3 via the shaft displacement absorbing washer 17 as described above, When the fuel injection valve 1 tilts, the gas seal member 40 (PTFE) tilts about the rotation center P0.

更に詳述すれば、燃料噴射弁1の上流側には、Oリング5を介して、燃料配管(レール配管)4が接続されているが、燃料配管4の位置がエンジン2との間で微妙にずれることがある。   More specifically, a fuel pipe (rail pipe) 4 is connected to the upstream side of the fuel injection valve 1 via an O-ring 5, but the position of the fuel pipe 4 is slightly different from the engine 2. May shift.

このように、燃料配管4が小径孔部20に対して軸ズレを起こした場合に、燃料噴射弁1は、先端のガスシール部材40を回転中心P0として傾斜する。このとき同時に、図2の燃料噴射弁1の大径部傾斜部分12上を、軸ズレ吸収ワッシャ17の曲面部32(図2)が滑り、軸ズレ吸収ワッシャ17は、半径方向へ移動する。   As described above, when the fuel pipe 4 is misaligned with respect to the small-diameter hole 20, the fuel injection valve 1 is inclined with the gas seal member 40 at the tip as the rotation center P0. At the same time, the curved surface portion 32 (FIG. 2) of the axial deviation absorbing washer 17 slides on the large diameter inclined portion 12 of the fuel injection valve 1 of FIG. 2, and the axial deviation absorbing washer 17 moves in the radial direction.

図2は、燃料噴射弁1が直立して傾かずに取付けられた状態を示す。燃料噴射弁1の座面部のテーパ面となる大径部傾斜部分12の両方の当接点30及び31に軸ズレ吸収ワッシャ17が均等に押し付けられ、燃料噴射弁1に曲げモーメントが作用することがない。   FIG. 2 shows a state in which the fuel injection valve 1 is installed upright without tilting. The axial displacement absorbing washer 17 is evenly pressed against both contact points 30 and 31 of the large-diameter inclined portion 12 that becomes the tapered surface of the seat portion of the fuel injection valve 1, and a bending moment acts on the fuel injection valve 1. Absent.

上記の構造における取付け方法について説明する。軸ズレ吸収ワッシャ17を燃料噴射弁に取付けた後に、脱落防止リング51となる金属性のC字型リングが溝部50に嵌入される。   The attachment method in said structure is demonstrated. After the shaft misalignment absorbing washer 17 is attached to the fuel injection valve, a metallic C-shaped ring that becomes the dropout prevention ring 51 is fitted into the groove 50.

この脱落防止リング51は、溝部50に径方向から挿入できる。この挿入時に、軸ズレ吸収ワッシャ17の向きが正しい向きで、燃料噴射弁1に挿入されているかをチェックすることが出来る。そしてチェックに合格した証に、脱落防止リング51を挿入することが出来る。   The dropout prevention ring 51 can be inserted into the groove 50 from the radial direction. At the time of this insertion, it is possible to check whether or not the shaft displacement absorbing washer 17 is inserted in the fuel injection valve 1 in the correct direction. And the fall prevention ring 51 can be inserted in the proof which passed the check.

また、図2のように、大径傾斜部分12の下面から溝部50までの寸法L4を軸ズレ吸収ワッシャ17の軸方向高さL5(図1)より小さくしている。これは、軸ズレ吸収ワッシャ17の向きが逆向きに燃料噴射弁1に挿入されている場合には、脱落防止リング51が、軸ズレ吸収ワッシャ17と干渉して、溝部50内に挿入し難いようにするためである。このようにすれば、脱落防止リング51が溝部50に嵌入されるときに、軸ズレ吸収ワッシャ17の逆向き取付けが発見し易い。   Further, as shown in FIG. 2, the dimension L4 from the lower surface of the large-diameter inclined portion 12 to the groove 50 is made smaller than the axial height L5 (FIG. 1) of the axial deviation absorbing washer 17. This is because when the shaft misalignment absorbing washer 17 is inserted into the fuel injection valve 1 in the opposite direction, the dropout prevention ring 51 interferes with the shaft misalignment absorbing washer 17 and is difficult to insert into the groove 50. It is for doing so. If it does in this way, when the drop-off prevention ring 51 is fitted in the groove part 50, it is easy to find the reverse mounting of the shaft misalignment absorbing washer 17.

図2において、更に詳細に説明する。上述のように、軸ズレ吸収ワッシャ17のエンジン2側への脱落を防止する脱落防止リング51が、ハウジング部分の外周に形成された溝部50内に嵌挿されている。そして、溝部50のエンジン2側に形成された隆起部53によって脱落防止リング51のエンジン2側への脱落を防止している。   This will be described in more detail with reference to FIG. As described above, the drop-off prevention ring 51 that prevents the shaft deviation absorbing washer 17 from dropping off toward the engine 2 is fitted into the groove 50 formed on the outer periphery of the housing portion. Further, the drop-off prevention ring 51 is prevented from falling off to the engine 2 side by the raised portion 53 formed on the engine 2 side of the groove portion 50.

溝部50の底面(基準面)となる燃料噴射弁1のハウジング表面から、隆起部53と径方向に対向する中径孔部21の内壁迄の寸法をL1と表記している。   The dimension from the housing surface of the fuel injection valve 1 serving as the bottom surface (reference surface) of the groove portion 50 to the inner wall of the medium-diameter hole portion 21 that faces the protruding portion 53 in the radial direction is denoted as L1.

溝部50の底面(基準面)から、脱落防止リング51の径方向最外端までの寸法をD2と表記している。この第1実施形態では、寸法D2は、脱落防止リング51の断面部外径寸法、つまり、脱落防止リング51の断面部の直径と一致している。   The dimension from the bottom surface (reference surface) of the groove portion 50 to the outermost end in the radial direction of the drop-off prevention ring 51 is denoted as D2. In the first embodiment, the dimension D <b> 2 coincides with the outer diameter of the cross-section portion of the drop-off prevention ring 51, that is, the diameter of the cross-section portion of the drop-off prevention ring 51.

溝部50の底面(基準面)から、隆起部53先端までの寸法、つまり、この第1実施形態では、溝部50の中に脱落防止リング51が埋まっている寸法をL3と表記している。そして、上記寸法L1、D2、及びL3の間において、L1<D2+L3の数式を満たしている。   The dimension from the bottom surface (reference surface) of the groove part 50 to the tip of the raised part 53, that is, the dimension in which the drop-off prevention ring 51 is buried in the groove part 50 is denoted as L3 in the first embodiment. And between the said dimensions L1, D2, and L3, the numerical formula of L1 <D2 + L3 is satisfy | filled.

この構成によれば、脱落防止リング51が、エンジン2側に脱落するためには、溝部50のエンジン2側に形成された隆起部53を乗り越えなければならない。そして隆起部53を乗り越えたと仮定したときの、溝部50の底面(基準面)から隆起部53を乗り越えた脱落防止リング51の径方向最外端までの寸法は、溝部50の底面(基準面)から隆起部53先端までの寸法L3に、脱落防止リング51の断面部外径寸法D2を加えたもの(D2+L3)と成る。   According to this configuration, in order for the fall prevention ring 51 to fall to the engine 2 side, it is necessary to get over the raised portion 53 formed on the engine 2 side of the groove 50. The dimension from the bottom surface (reference surface) of the groove portion 50 to the outermost end in the radial direction of the drop-off prevention ring 51 over the protruding portion 53 when it is assumed that the ridge portion 53 has been overcome is the bottom surface (reference surface) of the groove portion 50. Is obtained by adding the outer diameter dimension D2 of the cross section of the drop-off prevention ring 51 to the dimension L3 from the tip of the raised portion 53 to the tip of the raised portion 53 (D2 + L3).

ところが、溝部の底面(基準面)から中径孔部21の内周面となる隆起部対向壁面迄の寸法がL1であるから、L1<D2+L3の数式を満たす場合には、脱落防止リング51が隆起部53を乗り越えようとするときに、脱落防止リング51の径方向最外端が取付け孔3(中径孔部21)の内壁となる隆起部対向壁面に接触してしまう。このため、脱落防止リング51が隆起部53を乗り越えてエンジン2側に脱落するのが阻止できる。   However, since the dimension from the bottom surface (reference surface) of the groove portion to the raised portion-facing wall surface that is the inner peripheral surface of the medium-diameter hole portion 21 is L1, the drop-off prevention ring 51 is formed when the equation of L1 <D2 + L3 is satisfied. When trying to get over the raised portion 53, the radially outermost end of the drop-off preventing ring 51 comes into contact with the raised portion-facing wall surface that is the inner wall of the attachment hole 3 (medium diameter hole portion 21). For this reason, it is possible to prevent the drop-off prevention ring 51 from getting over the raised portion 53 and dropping out to the engine 2 side.

軸ズレ吸収ワッシャ17の内周径は、燃料噴射弁1の外周に挿入するために、少なくとも中径部10の外径より大きくする必要がある。しかし、一方で、この軸ズレ吸収ワッシャ17の内周径は、脱落防止リング51の外周径よりも小さいことが望ましい。   The inner diameter of the shaft misalignment absorbing washer 17 needs to be at least larger than the outer diameter of the medium diameter portion 10 in order to be inserted into the outer periphery of the fuel injection valve 1. However, on the other hand, it is desirable that the inner peripheral diameter of the shaft displacement absorbing washer 17 is smaller than the outer peripheral diameter of the drop-off preventing ring 51.

このようにすれば、燃料噴射弁1の外周に軸ズレ吸収ワッシャ17を挿入したあとで、軸ズレ吸収ワッシャ17が、燃料噴射弁1から脱落しようとしても、軸ズレ吸収ワッシャ17の内周が脱落防止リング51の外周に係合して、脱落を確実に阻止できる。また、特別に軸ズレ吸収ワッシャ17と脱落防止リング51とを連結する連結部材は不要となる。   In this manner, even if the shaft misalignment absorbing washer 17 is about to fall off the fuel injection valve 1 after the shaft misalignment absorbing washer 17 is inserted into the outer periphery of the fuel injection valve 1, the inner periphery of the shaft misalignment absorbing washer 17 remains. By engaging with the outer periphery of the drop-off prevention ring 51, the drop-out can be reliably prevented. In addition, a connecting member that connects the shaft misalignment absorbing washer 17 and the drop-off preventing ring 51 is not required.

(第2実施形態)
次に、本発明の第2実施形態について説明する。図3は、第2実施形態における燃料噴射弁1の取付け構造の要部拡大図である。なお、以降の各実施形態においては、上述した第1実施形態と同一の構成要素には同一の符号を付して説明を省略し、異なる構成および特徴について説明する。上記第2実施形態は、斜面状の中径孔部21をもつ実施形態である。つまり、中径孔部21と傾斜部27が一体化されている。
(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 3 is an enlarged view of a main part of the mounting structure of the fuel injection valve 1 in the second embodiment. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described. The second embodiment is an embodiment having a sloped medium-diameter hole 21. That is, the medium diameter hole portion 21 and the inclined portion 27 are integrated.

エンジン2のシリンダヘッドに穿設された取付け孔3は、斜面状の小径孔部20と斜面状の中径孔部21と大径孔部22を有している。また、中径孔部21と大径孔部22の間には、段部25を有する。   The mounting hole 3 drilled in the cylinder head of the engine 2 has a sloped small-diameter hole 20, a sloped medium-diameter hole 21, and a large-diameter hole 22. Further, a step portion 25 is provided between the medium diameter hole portion 21 and the large diameter hole portion 22.

この段部25は、半径方向に延在するワッシャ受け部26を有している。軸ズレ吸収ワッシャ17の断面は、実質的に直角三角形状である。燃料噴射弁1が正しく取付けられている図3の場合は、クリアランス36は左右均一に設けられている。   The step portion 25 has a washer receiving portion 26 extending in the radial direction. The cross section of the axial displacement absorbing washer 17 is substantially a right triangle. In the case of FIG. 3 in which the fuel injection valve 1 is correctly attached, the clearance 36 is provided uniformly on the left and right.

図1の燃料配管4が小径孔部20に対して軸ズレを起こした場合に、燃料噴射弁1の大径部傾斜部分12上を、軸ズレ吸収ワッシャ17の曲面部32が滑り、軸ズレ吸収ワッシャ17は、径方向へ直線移動する。   When the fuel pipe 4 shown in FIG. 1 has an axial deviation with respect to the small-diameter hole 20, the curved portion 32 of the axial deviation absorbing washer 17 slides on the large-diameter inclined portion 12 of the fuel injection valve 1, and the axial deviation occurs. The absorption washer 17 moves linearly in the radial direction.

上記の構造における取付け方法について説明する。軸ズレ吸収ワッシャ17を燃料噴射弁に組み付けた後に、脱落防止リング51となる金属性のC字型リングが溝部50に嵌入される。この脱落防止リング51は、溝部50に径方向から挿入できる。また、溝部50のエンジン2側に形成された隆起部53によって脱落防止リング51のエンジン2側への脱落を防止している。   The attachment method in said structure is demonstrated. After the shaft displacement absorbing washer 17 is assembled to the fuel injection valve, a metallic C-shaped ring that becomes the drop-off preventing ring 51 is fitted into the groove 50. The dropout prevention ring 51 can be inserted into the groove 50 from the radial direction. Further, the drop-off prevention ring 51 is prevented from falling off to the engine 2 side by a raised portion 53 formed on the engine 2 side of the groove portion 50.

溝部50の底面を通る軸方向の基準面から、隆起部53の径方向最外端と径方向に対向する取付け孔3の内壁迄の寸法をL1とし、溝部50の底面から脱落防止リング51の径方向最外端までの寸法をD2とし、溝部50の底面を通る軸方向の基準面から、隆起部53の径方向最外端までの寸法をL3としたとき、L1<D2+L3の数式を満たすように寸法が定められている。換言すれば、次のようになる。   The dimension from the axial reference surface passing through the bottom surface of the groove portion 50 to the inner wall of the mounting hole 3 facing the radially outermost end of the raised portion 53 in the radial direction is L1, and the drop prevention ring 51 of the drop prevention ring 51 is formed from the bottom surface of the groove portion 50. When the dimension to the outermost end in the radial direction is D2, and the dimension from the axial reference plane passing through the bottom surface of the groove 50 to the outermost end in the radial direction of the raised portion 53 is L3, the formula of L1 <D2 + L3 is satisfied. The dimensions are determined as follows. In other words, it is as follows.

溝部50の底面(基準面)となる燃料噴射弁1のハウジング表面から、燃料噴射弁1の軸方向と直交する径方向に、上記隆起部53先端が対面する取付け孔3の内周面迄の寸法をL1と表記している。   From the housing surface of the fuel injection valve 1 serving as the bottom surface (reference surface) of the groove 50 to the inner peripheral surface of the mounting hole 3 facing the tip of the raised portion 53 in the radial direction perpendicular to the axial direction of the fuel injection valve 1 The dimension is expressed as L1.

脱落防止リング51の断面部外径寸法、つまり、脱落防止リング51の断面部の直径をD2と表記している。溝部50の底面から隆起部53先端までの寸法をL3と表記している。   The outer diameter dimension of the cross-section portion of the drop-off prevention ring 51, that is, the diameter of the cross-section portion of the drop-off prevention ring 51 is denoted as D2. The dimension from the bottom surface of the groove 50 to the tip of the raised portion 53 is denoted as L3.

そして、上記寸法L1、D2、及びL3の間において、L1<D2+L3の数式を満たすように寸法が定められている。   Between the dimensions L1, D2, and L3, the dimensions are determined so as to satisfy the formula L1 <D2 + L3.

この構成によれば、脱落防止リング51がエンジン2側に脱落するためには、溝部50のエンジン2側に形成された隆起部53を乗り越えなければならない。そして隆起部53を乗り越えたと仮定したときの、溝部50の底面(基準面)から隆起部53を乗り越えた脱落防止リング51の先端までの寸法は、溝部50の底面から隆起部53先端までの寸法L3に、脱落防止リング51の断面部外径寸法D2を加えたもの(D2+L3)と成る。   According to this configuration, in order for the fall prevention ring 51 to fall to the engine 2 side, it is necessary to get over the raised portion 53 formed on the engine 2 side of the groove 50. When it is assumed that the ridge 53 has been overcome, the dimension from the bottom surface (reference surface) of the groove 50 to the tip of the drop prevention ring 51 that has overcome the ridge 53 is the dimension from the bottom of the groove 50 to the tip of the ridge 53. This is obtained by adding the outer diameter dimension D2 of the cross section of the dropout prevention ring 51 to D3 (D2 + L3).

ところが、溝部の底面(基準面)から前記取付け孔(3)の内周面となる隆起部対向壁面迄の寸法がL1であるから、L1<D2+L3の数式を満たす場合には、脱落防止リング51の先端が、隆起部53を乗り越えようとするときに、隆起部53と径方向に対面する取付け孔3の内壁に接触してしまう。このため、脱落防止リング51が隆起部53を乗り越えてエンジン2のシリンダヘッド側に脱落するのが阻止できる。   However, since the dimension from the bottom surface (reference surface) of the groove portion to the raised portion-facing wall surface serving as the inner peripheral surface of the mounting hole (3) is L1, the drop-off prevention ring 51 is satisfied when the formula of L1 <D2 + L3 is satisfied. When the tip of the stub is going to get over the raised portion 53, it comes into contact with the inner wall of the mounting hole 3 facing the raised portion 53 in the radial direction. For this reason, it is possible to prevent the drop prevention ring 51 from falling over the raised portion 53 to the cylinder head side of the engine 2.

(その他の実施形態)
本発明は上述した実施形態にのみ限定されるものではなく、次のように変形または拡張することができる。例えば、各実施形態では、軸ズレ吸収ワッシャ17を、燃料噴射弁1の傾斜部分12に当接させるにあたり、軸ズレ吸収ワッシャ17を大径部8と中径部10との間の大径部傾斜部分12に当接させたが、上記傾斜部分を、中径部10と小径部9を成すノズル部との間の中径部傾斜部分としてもよい。このようにすれば、軸ズレ吸収ワッシャ17と、その下側の脱落防止リング51を小型化することが出来る。
(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in each embodiment, when the shaft misalignment absorbing washer 17 is brought into contact with the inclined portion 12 of the fuel injection valve 1, the shaft misalignment absorbing washer 17 is a large diameter portion between the large diameter portion 8 and the medium diameter portion 10. Although it is brought into contact with the inclined portion 12, the inclined portion may be an intermediate diameter portion inclined portion between the intermediate diameter portion 10 and the nozzle portion forming the small diameter portion 9. In this way, it is possible to reduce the size of the shaft misalignment absorbing washer 17 and the drop-off preventing ring 51 on the lower side.

なお、この場合、脱落防止リング51は中径部傾斜部分よりエンジン2側の小径部の外周に設けた溝部内に収納される。   In this case, the drop-off prevention ring 51 is housed in a groove provided on the outer periphery of the small-diameter portion on the engine 2 side from the middle-diameter inclined portion.

また、軸ズレ吸収ワッシャ17は、断面円形のリング状(Oリング状)の金属としても良い。更に、脱落防止リング51は、C字型の金属リングでなくてもよく、小径部9となるノズル部側から燃料噴射弁1の軸方向に脱落防止リング51を移動させて、溝部50内に脱落防止リング51が押し込まれたときに、脱落防止リング51が弾性的に拡張するように変形して溝部50内にて、弾性的に縮小する非真円形のリングであっても良い。   Further, the axial deviation absorbing washer 17 may be a ring-shaped (O-ring shaped) metal having a circular cross section. Further, the drop-off prevention ring 51 does not have to be a C-shaped metal ring, and the drop-off prevention ring 51 is moved in the axial direction of the fuel injection valve 1 from the nozzle portion side that becomes the small diameter portion 9 to enter the groove portion 50. A non-circular ring that deforms so that the drop-off prevention ring 51 elastically expands when the drop-off prevention ring 51 is pushed in and elastically shrinks in the groove 50 may be used.

第1実施形態における燃料噴射弁の取付け構造を示す燃料噴射弁と取付け孔部分の一部断面正面図である。It is a partial cross section front view of the fuel injection valve which shows the attachment structure of the fuel injection valve in 1st Embodiment, and an attachment hole part. 上記第1実施形態における燃料噴射弁の取付け構造の要部拡大図である。It is a principal part enlarged view of the attachment structure of the fuel injection valve in the said 1st Embodiment. 第2実施形態における燃料噴射弁の取付け構造の要部拡大図である。It is a principal part enlarged view of the attachment structure of the fuel injection valve in 2nd Embodiment. 従来構造における燃料噴射弁の取付け構造を示す燃料噴射弁と取付け孔部分の一部断面正面図である。It is a partial cross section front view of the fuel injection valve which shows the attachment structure of the fuel injection valve in a conventional structure, and an attachment hole part.

符号の説明Explanation of symbols

1…燃料噴射弁
2…エンジン
3…取付け孔
4…燃料配管
8…大径部を成すハウジング部
9…小径部を成すノズル部
10…中径部
12…大径部傾斜部分
17…軸ズレ吸収ワッシャ
20…小径孔部
21…中径孔部
22…大径孔部
25…段部
26…ワッシャ受け部
30、31…当接点
34…直交壁部
35…直交壁
36…クリアランス
40…ガスシール部材
50…溝部
51…脱落防止リング
53…隆起部
DESCRIPTION OF SYMBOLS 1 ... Fuel injection valve 2 ... Engine 3 ... Mounting hole 4 ... Fuel piping 8 ... Housing part which comprises a large diameter part 9 ... Nozzle part which comprises a small diameter part 10 ... Medium diameter part 12 ... Large diameter part inclined part 17 ... Absorption of axial deviation Washer 20 ... small diameter hole 21 ... medium diameter hole 22 ... large diameter hole 25 ... step part 26 ... washer receiving part 30, 31 ... contact point 34 ... orthogonal wall part 35 ... orthogonal wall 36 ... clearance 40 ... gas seal member 50 ... Groove 51 ... Drop-off prevention ring 53 ... Raised portion

Claims (6)

燃料噴射弁(1)をエンジン(2)の取付け孔(3)に取付ける燃料噴射弁(1)の組付け構造であって、
前記燃料噴射弁(1)の反エンジン側は、燃料配管(4)に結合されており、
前記燃料噴射弁(1)は外径の大きさが異なるハウジング部分の間に傾斜部分(12)を有し、
前記燃料噴射弁(1)は、前記取付け孔(3)に対して加圧され、該加圧力を軸ズレ吸収ワッシャ(17)で受け、該軸ズレ吸収ワッシャ(17)は、前記傾斜部分(12)に位置し、
前記取付け孔(3)は、前記軸ズレ吸収ワッシャ(17)を受けるワッシャ受け部(26)を有する段部(25)を有し、
前記燃料噴射弁(1)の前記傾斜部分(12)と前記軸ズレ吸収ワッシャ(17)の前記反エンジン側に設けられた当接点(30、31)とが接触して、前記燃料噴射弁(1)が傾いて前記取付け孔(3)に取付けられたときに、前記軸ズレ吸収ワッシャ(17)は、前記傾斜部分(12)と対向する前記段部(25)の前記ワッシャ受け部(26)を摺動し、
前記軸ズレ吸収ワッシャ(17)の前記エンジン側に前記軸ズレ吸収ワッシャ(17)の前記エンジン側への脱落を防止する脱落防止リング(51)が前記ハウジング部分の外周に形成された溝部(50)に嵌挿されており、
前記溝部(50)の前記エンジン側に形成された隆起部(53)によって前記脱落防止リング(51)の前記エンジン側への脱落を防止し、前記脱落防止リング(51)が前記隆起部(53)を乗り越えようとしたときに、前記隆起部(53)と径方向に対向する前記取付け孔(3)の内壁に、前記脱落防止リング(51)が当接することを特徴とする燃料噴射弁の取付け構造。
An assembly structure of the fuel injection valve (1) for attaching the fuel injection valve (1) to the attachment hole (3) of the engine (2),
The non-engine side of the fuel injection valve (1) is coupled to the fuel pipe (4),
The fuel injection valve (1) has an inclined portion (12) between housing portions having different outer diameters,
The fuel injection valve (1) is pressurized against the mounting hole (3) and receives the applied pressure by a shaft misalignment absorbing washer (17). The shaft misalignment absorbing washer (17) 12)
The mounting hole (3) has a step portion (25) having a washer receiving portion (26) for receiving the shaft displacement absorbing washer (17),
The inclined portion (12) of the fuel injection valve (1) and the contact point (30, 31) provided on the non-engine side of the shaft displacement absorbing washer (17) come into contact with each other, and the fuel injection valve ( When the 1) is inclined and attached to the attachment hole (3), the shaft displacement absorbing washer (17) is attached to the washer receiving portion (26) of the step portion (25) facing the inclined portion (12). )
A groove portion (50) formed on the outer periphery of the housing portion is a drop-off prevention ring (51) for preventing the shaft-shift absorption washer (17) from dropping out to the engine side on the engine side of the shaft-shift absorption washer (17). )
The protruding portion (53) formed on the engine side of the groove portion (50) prevents the falling-off prevention ring (51) from falling off to the engine side, and the falling-off prevention ring (51) is provided on the protruding portion (53). ), The drop-off prevention ring (51) abuts against the inner wall of the mounting hole (3) that is radially opposed to the raised portion (53). Mounting structure.
前記溝部(50)の底面を通る軸方向の基準面から、前記隆起部(53)の径方向最外端と径方向に対向する前記取付け孔(3)の前記内壁迄の寸法をL1とし、
前記溝部(50)の底面から前記脱落防止リング(51)の径方向最外端までの寸法をD2とし、
前記溝部(50)の底面を通る軸方向の基準面から、前記隆起部(53)の径方向最外端までの寸法をL3としたとき、
L1<D2+L3の数式を満たすことを特徴とする請求項1に記載の燃料噴射弁の取付け構造。
The dimension from the axial reference plane passing through the bottom surface of the groove portion (50) to the inner wall of the mounting hole (3) radially facing the radially outermost end of the raised portion (53) is L1,
The dimension from the bottom surface of the groove (50) to the radially outermost end of the drop-off prevention ring (51) is D2,
When the dimension from the axial reference plane passing through the bottom surface of the groove portion (50) to the radially outermost end of the raised portion (53) is L3,
2. The fuel injection valve mounting structure according to claim 1, wherein L1 <D2 + L3 is satisfied.
前記軸ズレ吸収ワッシャ(17)の内周径は、前記脱落防止リング(51)の外周径よりも小さいことを特徴とする請求項1または2に記載の燃料噴射弁の取付け構造。   The fuel injection valve mounting structure according to claim 1 or 2, wherein an inner peripheral diameter of the shaft misalignment absorbing washer (17) is smaller than an outer peripheral diameter of the drop-off preventing ring (51). 前記燃料噴射弁(1)の駆動回路は大径部(8)を成す前記ハウジング部分に収納され、
前記燃料噴射弁(1)の弁部は小径部(9)を成すノズル部に収納され、
前記小径部(9)と前記大径部(8)の間に中径部(10)が設けられ、
前記軸ズレ吸収ワッシャ(17)は、前記大径部(8)と前記中径部(10)との間の前記傾斜部分(12)となる大径部傾斜部分(12)に位置し、
前記取付け孔(3)は、小径部(9)を成すノズル部が挿入される小径孔部(20)と、前記中径部(10)が挿入される中径孔部(21)と、前記大径部(8)が挿入される大径孔部(22)を有し、
前記大径孔部(22)と前記中径孔部(21)の間には前記軸ズレ吸収ワッシャ(17)を受ける前記ワッシャ受け部(26)を有する前記段部(25)が存在し、
前記燃料噴射弁(1)の前記大径部傾斜部分(12)と前記軸ズレ吸収ワッシャ(17)の前記反エンジン側に設けられた当接点(30、31)とが接触していることを特徴とする請求項1乃至3のいずれか一項に記載の燃料噴射弁の取付け構造。
The drive circuit of the fuel injection valve (1) is housed in the housing portion that forms the large diameter portion (8),
The valve portion of the fuel injection valve (1) is housed in a nozzle portion forming a small diameter portion (9),
A medium diameter part (10) is provided between the small diameter part (9) and the large diameter part (8),
The shaft misalignment absorbing washer (17) is located in the large-diameter portion inclined portion (12) serving as the inclined portion (12) between the large-diameter portion (8) and the medium-diameter portion (10),
The mounting hole (3) includes a small diameter hole portion (20) into which a nozzle portion forming a small diameter portion (9) is inserted, a medium diameter hole portion (21) into which the medium diameter portion (10) is inserted, Having a large diameter hole (22) into which the large diameter part (8) is inserted;
Between the large-diameter hole (22) and the medium-diameter hole (21) is the step (25) having the washer receiving portion (26) for receiving the axial displacement absorbing washer (17),
The large diameter portion inclined portion (12) of the fuel injection valve (1) is in contact with the contact point (30, 31) provided on the non-engine side of the shaft displacement absorbing washer (17). The fuel injection valve mounting structure according to any one of claims 1 to 3, wherein the fuel injection valve mounting structure is provided.
前記軸ズレ吸収ワッシャ(17)はリング状の金属よりなり、前記脱落防止リング(51)は前記溝部(50)内に嵌入されたC字型の金属リングから成ることを特徴とする請求項1乃至4のいずれか一項に記載の燃料噴射弁の取付け構造。   2. The shaft displacement absorbing washer (17) is made of a ring-shaped metal, and the drop-off prevention ring (51) is made of a C-shaped metal ring fitted in the groove (50). The fuel injection valve mounting structure according to any one of claims 1 to 4. 前記大径傾斜部分(12)の下面から前記溝部(50)までの寸法(L4)を前記軸ズレ吸収ワッシャ(17)の軸方向高さ(L5)より小さくしたことを特徴とする請求項1乃至5のいずれか一項に記載の燃料噴射弁の取付け構造。   The dimension (L4) from the lower surface of the large-diameter inclined portion (12) to the groove portion (50) is made smaller than the axial height (L5) of the axial displacement absorbing washer (17). The fuel injection valve mounting structure according to any one of claims 1 to 5.
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