JP5125909B2

JP5125909B2 - Fuel injection device for internal combustion engine

Info

Publication number: JP5125909B2
Application number: JP2008228454A
Authority: JP
Inventors: 啓介小森; 隆臼井
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2008-09-05
Filing date: 2008-09-05
Publication date: 2013-01-23
Anticipated expiration: 2028-09-05
Also published as: JP2010059914A

Description

本発明は、シリンダヘッドに設けられた燃料噴射弁を備えた内燃機関の燃料噴射装置に関する。 The present invention relates to a fuel injection device for an internal combustion engine provided with a fuel injection valve provided in a cylinder head.

シリンダヘッドに燃料噴射弁を設けると、その燃料噴射時に生じる振動がシリンダヘッドに伝達されることがある。シリンダヘッドへの振動の伝達を抑える対策として、シリンダヘッドに凹状の支持部を形成し、その支持部の底面にシール部材を介して燃料噴射弁の本体部を押し付け、押圧装置を用いて本体部とシリンダヘッドとの間の密着度合いを小さくする装置が知られている（特許文献１）。また、外周面に複数のＯリングが取り付けられたサイドフィード型の燃料噴射弁をシリンダヘッドカバーに形成された弁体収容孔部内に収容し、押えプレートで燃料噴射弁を押し付けることによりＯリングを弁体収容孔部の内周面に押し付けて、燃料噴射弁とシリンダヘッドカバーとが直接接触しないようにした装置も提案されている（特許文献２）。その他に、本発明に関連する先行技術文献として特許文献３〜６が存在する。 When a fuel injection valve is provided in the cylinder head, vibration generated during the fuel injection may be transmitted to the cylinder head. As a measure to suppress the transmission of vibration to the cylinder head, a concave support part is formed on the cylinder head, the main body part of the fuel injection valve is pressed against the bottom surface of the support part via a seal member, and the main body part is used by using a pressing device. There is known an apparatus for reducing the degree of adhesion between a cylinder head and a cylinder head (Patent Document 1). Further, a side-feed type fuel injection valve having a plurality of O-rings attached to the outer peripheral surface is accommodated in a valve body accommodating hole formed in the cylinder head cover, and the O-ring is controlled by pressing the fuel injection valve with a presser plate. An apparatus has also been proposed in which the fuel injection valve and the cylinder head cover are not in direct contact with each other by being pressed against the inner peripheral surface of the body accommodation hole (Patent Document 2). In addition, Patent Documents 3 to 6 exist as prior art documents related to the present invention.

特開２００６−９６３０号公報JP 2006-9630 A 特開２００５−８３２６１号公報JP 2005-83261 A 特開２００８−１１１４１１号公報JP 2008-111141 A 特開平１０−３１８０９５号公報Japanese Patent Laid-Open No. 10-318095 特開２００１−６５４２９号公報JP 2001-65429 A 実開平３−６３７６２号公報Japanese Utility Model Publication No. 3-63762

上述した特許文献１の装置では、燃料噴射弁の本体部とシリンダヘッドとの密着度合を小さくしても、燃料噴射弁はシール部材を介してシリンダヘッドと接しているので、燃料噴射弁で生じた振動はシール部材を介してシリンダヘッドに伝達する。また、特許文献２の装置では、燃料噴射弁がＯリングを介してシリンダヘッドカバーに接しているので、燃料噴射弁で生じた振動はＯリングを介してシリンダヘッドカバーに伝達するおそれがある。 In the apparatus of Patent Document 1 described above, the fuel injection valve is in contact with the cylinder head via the seal member even if the contact degree between the main body of the fuel injection valve and the cylinder head is reduced. The vibration is transmitted to the cylinder head via the seal member. Further, in the apparatus of Patent Document 2, since the fuel injection valve is in contact with the cylinder head cover via the O-ring, vibration generated in the fuel injection valve may be transmitted to the cylinder head cover via the O-ring.

そこで、本発明は、燃料噴射弁に生じた振動のシリンダヘッドへの伝達を効果的に抑えることができる内燃機関の燃料噴射装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a fuel injection device for an internal combustion engine that can effectively suppress transmission of vibration generated in a fuel injection valve to a cylinder head.

本発明の燃料噴射装置は、シリンダヘッドの外面に形成された孔部に設けられた燃料噴射弁と、前記シリンダヘッドに接続されて前記燃料噴射弁に燃料を導くデリバリパイプと、前記シリンダヘッドと前記デリバリパイプとの間に配置された弾性部材と、前記デリバリパイプを前記シリンダヘッドに固定するための固定手段と、を備えた内燃機関の燃料噴射装置において、前記燃料噴射弁は、前記孔部内に位置する噴射部と、前記孔部の外側に位置してその孔径よりも大きく形成され、かつ前記孔部側に位置する本体部下面を持つ本体部と、を有し、前記本体部の前記本体部下面と前記シリンダヘッドの前記外面とが非接触状態となるように設けられており、前記固定手段は、前記デリバリパイプに対して移動不能な状態で、前記シリンダヘッドに形成された挿入穴部に挿入され、挿入方向と交差する方向に延びる貫通孔が形成された第１保持部材と、前記シリンダヘッドに対して移動不能な状態で前記貫通孔に挿入された第２保持部材と、を有し、前記第１保持部材が前記弾性部材を圧縮するように前記シリンダヘッド側に沈み込んだ状態で、前記第２保持部材が前記第１保持部材の前記貫通孔に挿入されることによって前記デリバリパイプを前記シリンダヘッドに固定することにより、上述した課題を解決する（請求項１）。
A fuel injection device according to the present invention includes a fuel injection valve provided in a hole formed in an outer surface of a cylinder head, a delivery pipe connected to the cylinder head and guiding fuel to the fuel injection valve, and the cylinder head. An internal combustion engine fuel injection apparatus comprising: an elastic member disposed between the delivery pipe; and a fixing means for fixing the delivery pipe to the cylinder head. The fuel injection valve is disposed in the hole. And a main body portion that is located outside the hole portion and is formed to be larger than the hole diameter and has a lower surface of the main body portion that is located on the hole portion side, and a body lower surface and said outer surface of said cylinder head is provided so as to be non-contact state, said fixing means, in a condition not to be displaced with respect to the delivery pipe, said Shirindahe A first holding member formed with a through-hole extending in a direction crossing the insertion direction and inserted into the through-hole in a state incapable of moving with respect to the cylinder head. A second holding member, wherein the second holding member sinks to the cylinder head side so as to compress the elastic member, and the second holding member is the through hole of the first holding member. The above-described problem is solved by fixing the delivery pipe to the cylinder head by being inserted into the cylinder head .

本発明の燃料噴射装置によれば、本体部の本体部下面とシリンダヘッドの外面とが非接触状態となるように燃料噴射弁が設けられているので、本体部がシリンダヘッドの外面から浮いた状態に維持される。これにより、燃料噴射弁とシリンダヘッドとの間の直接的な振動伝達経路を遮断することができるので、燃料噴射弁に生じた振動のシリンダヘッドへの伝達を効果的に抑えることができる。また、シリンダブロックの振動に基づいてノッキングの発生の有無を検出するノッキング検出手段が設けられた内燃機関に本発明を適用した場合には、燃料噴射弁の振動がシリンダヘッドを介してシリンダブロックに伝達されることにより生じるノッキング検出手段の誤作動を未然に防止することもできる。また、デリバリパイプとシリンダヘッドの間に弾性部材を設けているので、燃料噴射弁からデリバリパイプに伝達した振動を弾性部材で吸収することができる。これにより、燃料噴射弁に生じた振動のシリンダヘッドへの伝達をさらに効果的に抑えることができる。さらに、第１保持部材が挿入穴部に挿入された状態で第２保持部材が貫通孔に挿入されることによってデリバリパイプをシリンダヘッドに固定することができるので、溶接やボルトなどの固定手段を利用する場合と比較して、デリバリパイプをシリンダヘッドに容易に固定することができる。
According to the fuel injection device of the present invention, since the fuel injection valve is provided so that the lower surface of the main body portion and the outer surface of the cylinder head are not in contact with each other, the main body portion floats from the outer surface of the cylinder head. Maintained in a state. As a result, the direct vibration transmission path between the fuel injection valve and the cylinder head can be cut off, so that transmission of vibration generated in the fuel injection valve to the cylinder head can be effectively suppressed. In addition, when the present invention is applied to an internal combustion engine provided with knocking detection means for detecting the presence or absence of knocking based on the vibration of the cylinder block, the vibration of the fuel injection valve is applied to the cylinder block via the cylinder head. It is also possible to prevent malfunction of the knocking detection means caused by transmission. Moreover, since the elastic member is provided between the delivery pipe and the cylinder head, the vibration transmitted from the fuel injection valve to the delivery pipe can be absorbed by the elastic member. Thereby, the transmission of vibration generated in the fuel injection valve to the cylinder head can be more effectively suppressed. Furthermore, since the delivery pipe can be fixed to the cylinder head by inserting the second holding member into the through-hole while the first holding member is inserted into the insertion hole, fixing means such as welding and bolts can be used. Compared to the case of using, the delivery pipe can be easily fixed to the cylinder head.

本発明の一形態において、前記デリバリパイプは、前記孔部の反対側に位置する前記本体部の端部が嵌め込まれる嵌め込み部を有するものであり、前記デリバリパイプに設けられて前記本体部の前記シリンダヘッド側への移動を制限する移動制限手段をさらに備えてもよい（請求項２）。燃料噴射弁は、燃圧によって本体部がシリンダヘッドに向かう方向の力を受けている。また、シリンダヘッド内が負圧の場合にも同様の力を受ける。そのため、本体部の端部をデリバリパイプの嵌め込み部に嵌め込んだ場合、本体部がシリンダヘッド側に移動して本体部下面とシリンダヘッドの外面とが接触するおそれがある。本形態によれば、移動制限手段によって本体部のシリンダヘッド側への移動が制限されるので、本体部とシリンダヘッドとが接触することを防止することができる。また、移動制限手段をシリンダヘッドではなくデリバリパイプに設けているので、燃料噴射弁に生じた振動をデリバリパイプに伝達させることができる。
In one form of the present invention, the delivery pipe is to have a fitting portion which the end portion of the main body portion on the opposite side of the hole is fitted, of the main body portion provided in the delivery pipe further it may be provided with movement limiting means to limit the movement to the cylinder head side (claim 2). The fuel injection valve receives a force in a direction in which the main body portion is directed toward the cylinder head by the fuel pressure. A similar force is also received when the cylinder head has a negative pressure. Therefore, when the end portion of the main body portion is fitted into the fitting portion of the delivery pipe, the main body portion may move to the cylinder head side and the lower surface of the main body portion and the outer surface of the cylinder head may come into contact with each other. According to this embodiment, since the movement of the main body portion toward the cylinder head is restricted by the movement restricting means, it is possible to prevent the main body portion and the cylinder head from contacting each other. Further, since the movement restricting means is provided not on the cylinder head but on the delivery pipe, vibration generated in the fuel injection valve can be transmitted to the delivery pipe.

上記の形態において、前記移動制御手段は、前記本体部の前記端部が前記デリバリパイプの前記嵌め込み部に嵌め込まれた状態で前記デリバリパイプ及び前記本体部を前記燃料噴射弁の長手方向から挟み込む保持部を備え、前記保持部には、前記デリバリパイプの上端面に接する上側突起部が設けられ、前記保持部は、前記デリバリパイプに対して前記燃料噴射弁の長手方向と交差する方向に前記燃料噴射弁と一体に移動可能に設けられ、前記上側突起部は、前記デリバリパイプの前記上端面に対して傾斜できるように形成されてもよい（請求項３）。本形態によれば、本体部及びデリバリパイプが燃料噴射弁の長手方向から保持部によって挟み込まれるので、本体部のシリンダヘッド側への移動が制限される。また、上側突起部をデリバリパイプの上端面に対して傾斜させることで、保持部をデリバリパイプに対して燃料噴射弁の長手方向と交差する方向に燃料噴射弁と一体に移動させることができる。このため、燃料噴射弁の短手方向に関してデリバリパイプの嵌め込み部と孔部との位置がずれている場合であっても、嵌め込み部と孔部との両方に燃料噴射弁を追従させることができる。これにより、嵌め込み部からの燃料漏れや孔部からのガス漏れを防止することができる。 In the above aspect, the movement control means holds the delivery pipe and the main body from the longitudinal direction of the fuel injection valve in a state where the end of the main body is fitted into the fitting part of the delivery pipe. The holding portion is provided with an upper protrusion that contacts an upper end surface of the delivery pipe, and the holding portion is arranged so that the fuel in a direction intersecting a longitudinal direction of the fuel injection valve with respect to the delivery pipe. The upper projecting portion may be formed so as to be movable integrally with the injection valve, and may be formed so as to be inclined with respect to the upper end surface of the delivery pipe. According to this embodiment, since the main body and the delivery pipe are sandwiched by the holding portion from the longitudinal direction of the fuel injection valve, the movement of the main body toward the cylinder head is limited. In addition, by tilting the upper protrusion with respect to the upper end surface of the delivery pipe, the holding part can be moved integrally with the fuel injection valve in a direction intersecting the longitudinal direction of the fuel injection valve with respect to the delivery pipe. For this reason, even if it is a case where the position of the fitting part of a delivery pipe and a hole part has shifted about the transversal direction of a fuel injection valve, a fuel injection valve can be made to follow both a fitting part and a hole part. . Thereby, the fuel leak from a fitting part and the gas leak from a hole can be prevented.

本発明の一形態において、前記移動制御手段は、前記本体部の前記端部が前記デリバリパイプの前記嵌め込み部に嵌め込まれた状態で前記デリバリパイプ及び前記本体部を前記燃料噴射弁の長手方向から挟み込む保持部を備え、前記保持部には、前記本体部の前記本体部下面に接する下側突起部が設けられ、前記保持部は、前記燃料噴射弁に対して当該燃料噴射弁の長手方向と交差する方向に移動可能に設けられ、前記下側突起部は、前記本体部の前記本体部下面に対して傾斜できるように形成されてもよい（請求項４）。本形態によれば、下側突起部を本体部下面に対して傾斜させることで、燃料噴射弁を保持部に対して燃料噴射弁の長手方向と交差する方向に移動させることができる。このため、燃料噴射弁の短手方向に関してデリバリパイプの嵌め込み部と孔部との位置がずれている場合であっても、嵌め込み部と孔部との両方に燃料噴射弁を追従させることができる。これにより、嵌め込み部からの燃料漏れや孔部からのガス漏れを防止することができる。 In one aspect of the present invention, the movement control means moves the delivery pipe and the main body portion from the longitudinal direction of the fuel injection valve in a state where the end portion of the main body portion is fitted in the fitting portion of the delivery pipe. A holding portion that sandwiches the lower portion of the main body, and a lower protrusion that is in contact with the lower surface of the main body. The holding portion is arranged in a longitudinal direction of the fuel injection valve with respect to the fuel injection valve. The lower projection may be provided so as to be movable in the intersecting direction, and may be formed so as to be inclined with respect to the lower surface of the main body portion of the main body portion. According to the present embodiment, the fuel injection valve can be moved in the direction intersecting the longitudinal direction of the fuel injection valve with respect to the holding portion by inclining the lower protrusion with respect to the lower surface of the main body. For this reason, even if it is a case where the position of the fitting part of a delivery pipe and a hole part has shifted about the transversal direction of a fuel injection valve, a fuel injection valve can be made to follow both a fitting part and a hole part. . Thereby, the fuel leak from a fitting part and the gas leak from a hole can be prevented.

本発明の一形態において、前記本体部の前記端部には、当該端部の外周面に設けられたシール部材が外れることを阻止する抜止部が形成され、前記デリバリパイプの前記嵌め込み部には、前記抜止部に向かって突出する絞り部が形成されてもよい（請求項５）。この形態によれば、抜止部に向かって突出する絞り部をデリバリパイプの嵌め込み部に形成しているので、絞り部を形成しない場合と比べて、抜止部と絞り部との間のクリアランスを狭くすることができる。これにより、燃料噴射弁に振動が生じて抜止部が移動した際に、クリアランスを通過する燃料の粘性抵抗が抜止部に生じるので、燃料噴射弁の振動を減衰させることができる。 In one aspect of the present invention, the end portion of the main body portion is formed with a retaining portion that prevents the seal member provided on the outer peripheral surface of the end portion from coming off, and the fitting portion of the delivery pipe has a fitting portion. A throttling portion that protrudes toward the retaining portion may be formed. According to this aspect, since the throttle portion protruding toward the retaining portion is formed in the fitting portion of the delivery pipe, the clearance between the retaining portion and the throttle portion is narrower than in the case where the throttle portion is not formed. can do. Thereby, when vibration is generated in the fuel injection valve and the retaining portion moves, the viscous resistance of the fuel passing through the clearance is generated in the retaining portion, so that the vibration of the fuel injection valve can be attenuated.

本発明の一形態において、前記噴射部が内燃機関の気筒内に位置しており、前記噴射部の外周面に装着された状態で前記シリンダヘッドと前記本体部との間に設けられ、かつ前記気筒から前記噴射部に伝達した熱を前記シリンダヘッドに伝達するばね部材を備えてもよい（請求項６）。燃料噴射弁の噴射部が気筒内に位置している場合、気筒から噴射部に熱が伝わることでその噴射部にデポジットが付着して燃料噴射弁の燃料の噴射不良といった不具合が生じることがある。本形態によれば、ばね部材を利用して気筒から噴射弁に伝達した熱をシリンダヘッドに伝達させることができるので、噴射部の過熱を抑えることができる。これにより、燃料噴射弁の燃料の噴射不良といった不具合が生じる懸念を排除することができる。また、燃料噴射弁の振動をばね部材で吸収することもできる。 In one aspect of the present invention, the injection unit is located in a cylinder of an internal combustion engine, and is provided between the cylinder head and the main body in a state of being mounted on an outer peripheral surface of the injection unit, and You may provide the spring member which transmits the heat transmitted to the said injection part from the cylinder to the said cylinder head (Claim 6). When the injection part of the fuel injection valve is located in the cylinder, heat may be transferred from the cylinder to the injection part, causing deposits to adhere to the injection part and causing a problem such as poor fuel injection of the fuel injection valve. . According to this embodiment, since the heat transmitted from the cylinder to the injection valve can be transmitted to the cylinder head using the spring member, overheating of the injection unit can be suppressed. As a result, it is possible to eliminate a concern that a problem such as fuel injection failure of the fuel injection valve occurs. Further, the vibration of the fuel injection valve can be absorbed by the spring member.

以上に説明したように、本発明の燃料噴射装置によれば、本体部の本体部下面とシリンダヘッドの外面とが非接触状態となるように燃料噴射弁が設けられているので、本体部がシリンダヘッドの外面から浮いた状態に維持される。これにより、燃料噴射弁とシリンダヘッドとの間の直接的な振動伝達経路を遮断することができるので、燃料噴射弁に生じた振動のシリンダヘッドへの伝達を効果的に抑えることができる。 As described above, according to the fuel injection device of the present invention, the fuel injection valve is provided so that the lower surface of the main body portion of the main body portion and the outer surface of the cylinder head are not in contact with each other. It is kept floating from the outer surface of the cylinder head. As a result, the direct vibration transmission path between the fuel injection valve and the cylinder head can be cut off, so that transmission of vibration generated in the fuel injection valve to the cylinder head can be effectively suppressed.

（第１の形態）
図１は本発明に係る燃料噴射装置が適用された内燃機関の要部を模式的に示した図である。図２は図１のIIーII線に沿った断面図を示している。内燃機関（以下、エンジンと呼ぶことがある。）１Ａは、車両に走行用動力源として搭載された火花点火式内燃機関として構成されている。エンジン１Ａは、４つの気筒２が形成されたシリンダブロック３と、それらの気筒２を塞ぐようにシリンダブロック３の上部に設けられたシリンダヘッド４と、燃料タンク５から燃料通路６を介して導かれた燃料を各気筒２内に噴射するための燃料噴射装置７Ａとを備えている。シリンダブロック３には、シリンダブロック３の振動に基づいてノッキングの有無を検出するノックセンサ８が設けられている。図２に示すように、シリンダヘッド４には、その外面に形成された凹部９の底面から気筒２まで延びる孔部１０が形成されている。燃料通路６には、燃料ポンプ１１が設けられている（図１参照）。 (First form)
FIG. 1 is a view schematically showing a main part of an internal combustion engine to which a fuel injection device according to the present invention is applied. FIG. 2 is a cross-sectional view taken along line II-II in FIG. An internal combustion engine (hereinafter sometimes referred to as an engine) 1A is configured as a spark ignition type internal combustion engine mounted on a vehicle as a driving power source. The engine 1A is guided through a fuel block 6 from a cylinder block 3 in which four cylinders 2 are formed, a cylinder head 4 provided at the top of the cylinder block 3 so as to close the cylinders 2, and a fuel tank 5. And a fuel injection device 7A for injecting the injected fuel into each cylinder 2. The cylinder block 3 is provided with a knock sensor 8 that detects the presence or absence of knocking based on the vibration of the cylinder block 3. As shown in FIG. 2, the cylinder head 4 has a hole 10 extending from the bottom surface of the recess 9 formed on the outer surface thereof to the cylinder 2. A fuel pump 11 is provided in the fuel passage 6 (see FIG. 1).

燃料噴射装置７Ａは、気筒２毎に設けられた燃料噴射弁１２と、燃料通路６から導かれる燃料を各燃料噴射弁１２に導くデリバリパイプ１３と、デリバリパイプ１３に設けられた移動制限手段としての保持部１４とを備えている。デリバリパイプ１３は固定部材１５にてシリンダヘッド４に固定されている。燃料噴射弁１２の基本的な構造は周知のものと同様である。そのため、燃料噴射弁１２の詳細な説明は省略し、本発明に関連する部位のみ以下に説明する。図２に示すように、燃料噴射弁１２は、凹部９の幅よりも大きく形成された本体部１６と、孔部１０に位置する噴射部１７とを有している。噴射部１７は、孔部１０を介して気筒２まで延びる小径部１７ａと、小径部１７ａの径よりも大きな径を有した大径部１７ｂとを備えている。小径部１７ａの外周面にはシール部材１９が設けられている。これにより、気筒２内の気体が外部に漏れることを防ぐことができる。孔部１０の反対側に位置する本体部１６の端部１６ａは、デリバリパイプ１３の嵌め込み部２０に嵌め込まれている。つまり、燃料噴射弁１２は後端側から燃料が導かれるいわゆるトップフィード型燃料噴射弁として構成されている。本体部１６とデリバリパイプ１３とはクランプ２１によって固定されている。本体部１６の端部１６ａには、その外周面に設けられたシール部材としてのＯリング２１が本体部１６から外れることを阻止する抜止部２３が形成されている。また、燃料噴射弁１２の長手方向の位置は、孔部１０側に位置する本体部下面１６ｂとシリンダヘッド４の外面４ａとが非接触状態となるように調整されている。 The fuel injection device 7A includes a fuel injection valve 12 provided for each cylinder 2, a delivery pipe 13 that guides the fuel guided from the fuel passage 6 to each fuel injection valve 12, and a movement limiting means provided in the delivery pipe 13. The holding part 14 is provided. The delivery pipe 13 is fixed to the cylinder head 4 by a fixing member 15. The basic structure of the fuel injection valve 12 is the same as a known one. Therefore, the detailed description of the fuel injection valve 12 is omitted, and only a portion related to the present invention will be described below. As shown in FIG. 2, the fuel injection valve 12 has a main body portion 16 formed larger than the width of the recess 9 and an injection portion 17 located in the hole portion 10. The injection unit 17 includes a small diameter portion 17a extending to the cylinder 2 through the hole portion 10, and a large diameter portion 17b having a diameter larger than the diameter of the small diameter portion 17a. A seal member 19 is provided on the outer peripheral surface of the small diameter portion 17a. Thereby, the gas in the cylinder 2 can be prevented from leaking outside. An end portion 16 a of the main body portion 16 located on the opposite side of the hole portion 10 is fitted into the fitting portion 20 of the delivery pipe 13. That is, the fuel injection valve 12 is configured as a so-called top feed type fuel injection valve in which fuel is guided from the rear end side. The main body 16 and the delivery pipe 13 are fixed by a clamp 21. The end portion 16 a of the main body portion 16 is formed with a retaining portion 23 that prevents the O-ring 21 as a sealing member provided on the outer peripheral surface from being detached from the main body portion 16. The longitudinal position of the fuel injection valve 12 is adjusted so that the main body lower surface 16b located on the hole 10 side and the outer surface 4a of the cylinder head 4 are not in contact with each other.

保持部１４は、本体部１６及びデリバリパイプ１３を燃料噴射弁１２の長手方向から挟み込むようにして設けられている。保持部１４は、デリバリパイプ１３の上端面１３ａに接する上板部２４と、上板部２４の両端から本体部１６に向かって延びる側板部２５と、側板部２５の端部に設けられて本体部下面１６ｂと接する下板部２６とを備えている。デリバリパイプ１３及び本体部１６と側板部２４との間には幾らかの隙間が空いている。 The holding portion 14 is provided so as to sandwich the main body portion 16 and the delivery pipe 13 from the longitudinal direction of the fuel injection valve 12. The holding portion 14 is provided at the upper plate portion 24 that contacts the upper end surface 13 a of the delivery pipe 13, the side plate portion 25 that extends from both ends of the upper plate portion 24 toward the main body portion 16, and the end portion of the side plate portion 25. The lower plate part 26 which contacts the part lower surface 16b is provided. There are some gaps between the delivery pipe 13 and the main body 16 and the side plate 24.

以上のように構成された燃料噴射装置７Ａにおいては、本体部１６の本体部下面１６ｂとシリンダヘッド４の外面４ａとが非接触状態となっているので、本体部１６がシリンダヘッド４から浮いた状態に維持される。これにより、燃料噴射弁１２とシリンダヘッド４との間の直接的な振動伝達経路を遮断することができるので、燃料噴射弁１２に生じた振動のシリンダヘッド４への伝達を効果的に抑えることができる。よって、燃料噴射弁１２からシリンダヘッド４を介してシリンダブロック３に伝達される振動も抑えられるので、燃料噴射弁１２の振動がシリンダブロック３に伝達されることにより生じるノックセンサ８の誤作動を未然に防止することができる。 In the fuel injection device 7A configured as described above, the main body portion lower surface 16b of the main body portion 16 and the outer surface 4a of the cylinder head 4 are not in contact with each other. Maintained in a state. As a result, the direct vibration transmission path between the fuel injection valve 12 and the cylinder head 4 can be cut off, so that transmission of vibration generated in the fuel injection valve 12 to the cylinder head 4 can be effectively suppressed. Can do. Therefore, the vibration transmitted from the fuel injection valve 12 to the cylinder block 3 via the cylinder head 4 is also suppressed, so that the malfunction of the knock sensor 8 caused by the vibration of the fuel injection valve 12 being transmitted to the cylinder block 3 is prevented. It can be prevented in advance.

燃料噴射弁１２は、燃料ポンプ１１の燃圧によって本体部１６がシリンダヘッド４に向かう方向の力を受ける。また、燃料噴射弁１２は、気筒２内が負圧状態の場合にも同様の力を受ける。本形態の燃料噴射装置７Ａにおいては、保持部１４が設けられているので本体部１６のシリンダヘッド４側への移動が制限される。これにより、本体部１６とシリンダヘッド４とが接触することを防止することができる。 The fuel injection valve 12 receives a force in the direction in which the main body portion 16 is directed toward the cylinder head 4 by the fuel pressure of the fuel pump 11. The fuel injection valve 12 receives the same force even when the cylinder 2 is in a negative pressure state. In the fuel injection device 7A of this embodiment, since the holding portion 14 is provided, the movement of the main body portion 16 toward the cylinder head 4 is limited. Thereby, it can prevent that the main-body part 16 and the cylinder head 4 contact.

なお、本形態では、クランプ２１に換えてばね部材を使用してもよい。この場合、燃料噴射弁１２で生じた振動をばね部材で吸収することができる。また、保持部１４は、燃料噴射弁１２の外周を囲む筒状に形成してもよい。 In this embodiment, a spring member may be used instead of the clamp 21. In this case, the vibration generated in the fuel injection valve 12 can be absorbed by the spring member. Further, the holding portion 14 may be formed in a cylindrical shape surrounding the outer periphery of the fuel injection valve 12.

（第２の形態）
図３は本発明の第２の形態に係る燃料噴射装置７Ｂが適用された内燃機関１Ｂの要部を示した図である。なお、上述した第１の形態と共通する部分には同一の参照符号を付し、重複する説明は省略する。図３に示すように、本形態のデリバリパイプ１３Ｂは、燃料噴射弁１２と並ぶようにしてシリンダヘッド４Ｂに形成されたボス部２７とそのボス部２７の上部に位置するデリバリパイプ支持部２８とをボルト２９で締付けることによってシリンダヘッド４Ｂに固定されている。また、本形態の燃料噴射装置７Ｂには、ボルト２９の上端部とデリバリパイプ支持部２８との間に配置された受部材３０と、ボス部２７とデリバリパイプ支持部２８との間に配置された弾性部材３１とが設けられている。受部材３０は、気筒２内が正圧状態の場合にデリバリパイプ支持部２８に生じる力を受けることが可能な程度の剛性を有しており、例えば金属などで形成されている。弾性部材３１は、気筒２内が負圧状態の場合にデリバリパイプ支持部２８に生じる力とボルト２７の軸力とに耐え得る強度を有しており、例えばゴムなどで形成されている。 (Second form)
FIG. 3 is a view showing a main part of the internal combustion engine 1B to which the fuel injection device 7B according to the second embodiment of the present invention is applied. In addition, the same referential mark is attached | subjected to the part which is common in the 1st form mentioned above, and the overlapping description is abbreviate | omitted. As shown in FIG. 3, the delivery pipe 13 B of the present embodiment includes a boss portion 27 formed on the cylinder head 4 B so as to be aligned with the fuel injection valve 12, and a delivery pipe support portion 28 positioned on the boss portion 27. Is fixed to the cylinder head 4B by tightening with a bolt 29. Further, in the fuel injection device 7B of the present embodiment, the receiving member 30 disposed between the upper end portion of the bolt 29 and the delivery pipe support portion 28, and the boss portion 27 and the delivery pipe support portion 28 are disposed. The elastic member 31 is provided. The receiving member 30 has such a rigidity that it can receive a force generated in the delivery pipe support portion 28 when the inside of the cylinder 2 is in a positive pressure state, and is made of, for example, metal. The elastic member 31 has a strength capable of withstanding the force generated in the delivery pipe support portion 28 and the axial force of the bolt 27 when the inside of the cylinder 2 is in a negative pressure state, and is formed of, for example, rubber.

本形態のエンジン１Ｂにおいて、デリバリパイプ支持部２８は、気筒２内が正圧状態の場合に図３の矢印Ａの方向の力を受け、気筒２内が負圧状態の場合に図３の矢印Ｂの方向の力を受ける。また、燃料噴射弁１２に生じた振動は、デリバリパイプ支持部２８を介してシリンダヘッド４Ｂに伝達される。本形態の燃料噴射装置７Ｂによれば、気筒２内が正圧状態の場合に生じる力を受部材３０で受けることができる。これにより、ボルト２９が損傷することを防止することができる。また、燃料噴射弁１２からデリバリパイプ支持部２８に伝達された振動を弾性部材３１で吸収することができる。これにより、燃料噴射弁１２に生じた振動のシリンダヘッド４Ｂへの伝達をさらに効果的に抑えることができる。なお、本形態においては燃料噴射装置７Ｂが保持部１４を備えていない構成であっても同様の効果を得ることができる。 In the engine 1B of the present embodiment, the delivery pipe support 28 receives a force in the direction of arrow A in FIG. 3 when the cylinder 2 is in a positive pressure state, and the arrow in FIG. 3 when the cylinder 2 is in a negative pressure state. Receives force in direction B. The vibration generated in the fuel injection valve 12 is transmitted to the cylinder head 4B via the delivery pipe support portion 28. According to the fuel injection device 7B of the present embodiment, the force generated when the cylinder 2 is in the positive pressure state can be received by the receiving member 30. Thereby, it is possible to prevent the bolt 29 from being damaged. Further, the vibration transmitted from the fuel injection valve 12 to the delivery pipe support 28 can be absorbed by the elastic member 31. Thereby, transmission of the vibration generated in the fuel injection valve 12 to the cylinder head 4B can be further effectively suppressed. In the present embodiment, the same effect can be obtained even if the fuel injection device 7B is not provided with the holding portion 14.

（第３の形態）
図４は本発明の第３の形態に係る燃料噴射装置７Ｃを示した図である。なお、図４は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図４に示すように、本形態の燃料噴射装置７Ｃには、半球状に形成された上側突起部３２が保持部１４の上板部２４に設けられている。上側突起部３２は、その半球面がデリバリパイプ１３の上端面１３ａに接している。上側突起部３２と保持部１４とは一体に形成されている。 (Third form)
FIG. 4 is a view showing a fuel injection device 7C according to the third embodiment of the present invention. Note that FIG. 4 corresponds to FIG. 2, and portions that are the same as those in FIG. 2 described above are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 4, in the fuel injection device 7 C of the present embodiment, an upper protrusion 32 formed in a hemispherical shape is provided on the upper plate portion 24 of the holding portion 14. The upper protrusion 32 has a hemispherical surface in contact with the upper end surface 13 a of the delivery pipe 13. The upper protruding portion 32 and the holding portion 14 are integrally formed.

本形態では、上側突起部３２が半球状に形成されているので、上側突起部３２をデリバリパイプ１３の上端面１３ａに対して傾斜させることができる。つまり、保持部１４はデリバリパイプ１３に対して燃料噴射弁１２の長手方向と交差する方向（図４の矢印の方向）に移動させることができる。また、保持部１４の下板部２６と本体部１６の本体部下面１６ｂとの間には摩擦力が生じているので、保持部１４と燃料噴射弁１２とを一体に移動させることができる。これにより、燃料噴射弁１２の短手方向に関してデリバリパイプ１３の嵌め込み部２０と孔部１０との位置がずれた場合であっても、燃料噴射弁１２を追従させることができるので、嵌め込み部２０からの燃料漏れや孔部１０からの燃焼ガス漏れを防止することができる。 In the present embodiment, since the upper protrusion 32 is formed in a hemispherical shape, the upper protrusion 32 can be inclined with respect to the upper end surface 13 a of the delivery pipe 13. That is, the holding portion 14 can be moved with respect to the delivery pipe 13 in a direction intersecting the longitudinal direction of the fuel injection valve 12 (in the direction of the arrow in FIG. 4). Further, since a frictional force is generated between the lower plate portion 26 of the holding portion 14 and the main body portion lower surface 16b of the main body portion 16, the holding portion 14 and the fuel injection valve 12 can be moved together. Thereby, even if it is a case where the position of the fitting part 20 of the delivery pipe 13 and the hole part 10 has shifted | deviated regarding the transversal direction of the fuel injection valve 12, the fuel injection valve 12 can be made to follow. It is possible to prevent fuel leakage from the fuel and combustion gas leakage from the hole 10.

なお、本形態の上側突出部３２は、半球状に形成する例に限らず、デリバリパイプ１３の上端面１３ａに対して傾斜させることができる限り、適宜に変更が可能である。例えば、上側突出部３２を半弧状に形成してもよいし、先端が尖るように円錐状に形成してもよい。 In addition, the upper side protrusion part 32 of this form is not restricted to the example formed in a hemisphere, As long as it can be made to incline with respect to the upper end surface 13a of the delivery pipe 13, it can change suitably. For example, the upper protrusion 32 may be formed in a semi-arc shape, or may be formed in a conical shape with a sharp tip.

（第４の形態）
図５は本発明の第４の形態に係る燃料噴射装置７Ｄを示した図である。図６は図５の特徴部を側面から見た図である。なお、図５は図４に対応しており、上述した図５と共通する部分には同一の参照符号を付し、重複する説明は省略する。図５に示すように、本形態の燃料噴射装置７Ｄには、半弧状に形成された２つ下側突起部３３が保持部１４の下板部２６に設けられている。下側突起部３３は、その半弧面が本体部下面１６ｂに接している。下側突起部３３と保持部１４とは一体に形成されている。 (4th form)
FIG. 5 is a view showing a fuel injection device 7D according to the fourth embodiment of the present invention. FIG. 6 is a side view of the characteristic portion of FIG. Note that FIG. 5 corresponds to FIG. 4, and parts that are the same as those in FIG. 5 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 5, in the fuel injection device 7 D of this embodiment, two lower protrusions 33 formed in a semi-arc shape are provided on the lower plate portion 26 of the holding portion 14. As for the lower side protrusion part 33, the semi-arc surface is in contact with the main-body-part lower surface 16b. The lower protruding portion 33 and the holding portion 14 are integrally formed.

本形態では、下側突起部３３が半弧状に形成されているので、下側突起部３３を本体部下面１６ｂに対して傾斜させることができる。つまり、燃料噴射弁１２を下側突起部３３の半弧面に沿った方向（図６の矢印の方向）に移動させることができる。これにより、上側突起部３２のみを設けた場合よりも燃料噴射弁１２の可動範囲を増やすことができるので、デリバリパイプ１３の嵌め込み部２０と孔部１０との両方への燃料噴射弁１２の追従性を向上させることができる。 In the present embodiment, since the lower protrusion 33 is formed in a semi-arc shape, the lower protrusion 33 can be inclined with respect to the main body lower surface 16b. That is, the fuel injection valve 12 can be moved in the direction along the semi-arc surface of the lower projection 33 (the direction of the arrow in FIG. 6). Thereby, since the movable range of the fuel injection valve 12 can be increased as compared with the case where only the upper protrusion 32 is provided, the fuel injection valve 12 follows both the fitting portion 20 and the hole portion 10 of the delivery pipe 13. Can be improved.

なお、本形態の下側突起部３３は、半弧状に形成する例に限らず、本体部下面１６ｂに対して傾斜させることができる限り、適宜に変更が可能である。例えば、下側突起部３３を半球状に形成してもよいし、先端が尖るように円錐状に形成してもよい。また、下側突起部３３の配置する方向は任意に設定してよい。 In addition, the lower protrusion part 33 of this form is not restricted to the example formed in a semi-arc shape, As long as it can be made to incline with respect to the main-body-part lower surface 16b, it can change suitably. For example, the lower protrusion 33 may be formed in a hemispherical shape, or may be formed in a conical shape with a sharp tip. Further, the direction in which the lower protrusion 33 is arranged may be arbitrarily set.

（第５の形態）
図７は本発明の第５の形態に係る燃料噴射装置７Ｅを示した図である。なお、図７は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図７に示すように、本形態の保持部１４Ｅは、上側保持部３４と下側保持部３５とを有している。上側保持部３４の上端部にはボルト３６が取り付けられ、球面状に形成されたボルト３６の先端部がデリバリパイプ１３の上端面１３ａに接している。また、下側保持部３５は上側保持部３４に嵌め込まれている。 (5th form)
FIG. 7 is a view showing a fuel injection device 7E according to the fifth embodiment of the present invention. Note that FIG. 7 corresponds to FIG. 2, and portions common to FIG. 2 described above are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 7, the holding unit 14 E of this embodiment includes an upper holding unit 34 and a lower holding unit 35. A bolt 36 is attached to the upper end portion of the upper holding portion 34, and the tip end portion of the bolt 36 formed in a spherical shape is in contact with the upper end surface 13 a of the delivery pipe 13. The lower holding portion 35 is fitted into the upper holding portion 34.

本形態においては、上側保持部３４をデリバリパイプ１３の上方から嵌めた後に下側保持部３５を上側保持部３４に嵌め込み、最後にボルト３６を締め込むことにより保持部１４Ｅを組み付けることができる。これにより、保持部１４Ｅの組み付け性を向上させることができる。 In this embodiment, the holding portion 14E can be assembled by fitting the upper holding portion 34 from above the delivery pipe 13 and then fitting the lower holding portion 35 into the upper holding portion 34 and finally tightening the bolt 36. Thereby, the assembly | attachment property of the holding | maintenance part 14E can be improved.

（第６の形態）
図８は本発明の第６の形態に係る燃料噴射装置７Ｆを示した図である。なお、図８は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図８に示すように、本形態の燃料噴射装置７Ｆには、保持部１４Ｆの上板部２４Ｆにボルト３７が設けられている。ボルト３７の先端部は、球面状に形成され、デリバリパイプ１３の上端面１３ａに接している。また、燃料噴射弁１２Ｆの本体部１６Ｆの一部が、デリバリパイプ１３の幅Ｃよりも大きくなるように幾らか外側に突出し、下板部２６Ｆ間の間隔Ｄがデリバリパイプ１３の幅Ｃよりも大きくなるように設定されている。 (Sixth form)
FIG. 8 is a view showing a fuel injection device 7F according to the sixth embodiment of the present invention. Note that FIG. 8 corresponds to FIG. 2, and portions common to FIG. 2 described above are denoted by the same reference numerals, and redundant description is omitted. As shown in FIG. 8, in the fuel injection device 7F of this embodiment, a bolt 37 is provided on the upper plate portion 24F of the holding portion 14F. The tip of the bolt 37 is formed in a spherical shape and is in contact with the upper end surface 13 a of the delivery pipe 13. Further, a part of the main body portion 16F of the fuel injection valve 12F protrudes somewhat outward so as to be larger than the width C of the delivery pipe 13, and the interval D between the lower plate portions 26F is larger than the width C of the delivery pipe 13. It is set to be large.

本形態においては、下板部２４Ｆ間の間隔Ｄをデリバリパイプ１３の幅Ｃよりも大きく形成しているので、保持部１４Ｆをデリバリパイプ１３の上方から被せるようにして取り付けることができる。これにより、保持部１４Ｆを容易に組み付けることができる。 In this embodiment, since the interval D between the lower plate portions 24F is formed larger than the width C of the delivery pipe 13, the holding portion 14F can be attached so as to be covered from above the delivery pipe 13. Thereby, the holding | maintenance part 14F can be assembled | attached easily.

（第７の形態）
図９は本発明の第７の形態に係る燃料噴射装置７Ｇを示した図である。なお、図９は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図９に示すように、本形態の側板部２５Ｇには、ばね部材３８が設けられている。これにより、燃料噴射弁１２から保持部１４Ｇに伝達された振動がばね部材３８で吸収されるので、燃料噴射弁１２の振動のシリンダヘッドへ４の伝達をさらに効果的に抑えることができる。 (7th form)
FIG. 9 is a view showing a fuel injection device 7G according to the seventh embodiment of the present invention. Note that FIG. 9 corresponds to FIG. 2, and parts that are the same as those in FIG. 2 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 9, a spring member 38 is provided on the side plate portion 25G of the present embodiment. Thereby, since the vibration transmitted from the fuel injection valve 12 to the holding portion 14G is absorbed by the spring member 38, the transmission of the vibration of the fuel injection valve 12 to the cylinder head can be further effectively suppressed.

なお、本形態の側板部２５Ｇは、第３の形態又は第４の形態にも適用することができる。 Note that the side plate portion 25G of this embodiment can also be applied to the third embodiment or the fourth embodiment.

（第８の形態）
図１０は本発明の第８の形態に係る燃料噴射装置７Ｈの一部を拡大して示した図である。なお、上述した第１の形態と共通する部分には同一の参照符号を付し、重複する説明は省略する。図１０に示すように、本形態のデリバリパイプ１３Ｈの嵌め込み部２０Ｈには、抜止部２３に向かって突出する絞り部３９が形成されている。絞り部３９の突出量は、絞り部３９と抜止部２３との間のクリアランスが最小限になるように設定されている。 (8th form)
FIG. 10 is an enlarged view of a part of the fuel injection device 7H according to the eighth embodiment of the present invention. In addition, the same referential mark is attached | subjected to the part which is common in the 1st form mentioned above, and the overlapping description is abbreviate | omitted. As shown in FIG. 10, the fitting portion 20H of the delivery pipe 13H of the present embodiment is formed with a throttle portion 39 that protrudes toward the retaining portion 23. The protruding amount of the throttle portion 39 is set so that the clearance between the throttle portion 39 and the retaining portion 23 is minimized.

本形態においては、デリバリパイプ１３Ｈの嵌め込み部２０Ｈに絞り部３９を設けているので、絞り部３９を設けない場合と比べて、絞り部３９と抜止部２３との間のクリアランスが小さくなる。これにより、燃料噴射弁１２に振動が生じて抜止部２３が移動した際に、クリアランスを通過する燃料の粘性抵抗が抜止部２３に生じるので、燃料噴射弁１２の振動を減衰させることができる。 In this embodiment, since the throttle portion 39 is provided in the fitting portion 20H of the delivery pipe 13H, the clearance between the throttle portion 39 and the retaining portion 23 is smaller than in the case where the throttle portion 39 is not provided. Thereby, when vibration is generated in the fuel injection valve 12 and the retaining portion 23 moves, the viscous resistance of the fuel passing through the clearance is generated in the retaining portion 23, so that the vibration of the fuel injection valve 12 can be attenuated.

なお、本形態の絞り部３９は、第２の形態〜第７の形態のいずれかの形態にも適用することができる。 In addition, the aperture | diaphragm | squeeze part 39 of this form is applicable also in any form of a 2nd form-a 7th form.

（第９の形態）
図１１は本発明の第９の形態に係る燃料噴射装置７Ｉを示した図である。なお、図１１は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図１１に示すように、本形態の燃料噴射装置７Ｉには、本体部下面１６ｂと下板部２６との間に弾性部材４０が設けられている。弾性部材４０としては、例えば皿はねやコイルばね等を用いることができる。この形態においては、燃料噴射弁１２の振動を弾性部材４０で吸収することができるので、燃料噴射弁１２に生じた振動のシリンダヘッド４への伝達をさらに効果的に抑えることができる。 (9th form)
FIG. 11 is a view showing a fuel injection device 7I according to the ninth embodiment of the present invention. Note that FIG. 11 corresponds to FIG. 2, and parts that are the same as those in FIG. 2 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 11, the fuel injection device 7 I of this embodiment is provided with an elastic member 40 between the main body lower surface 16 b and the lower plate part 26. As the elastic member 40, for example, a dish spring or a coil spring can be used. In this embodiment, since the vibration of the fuel injection valve 12 can be absorbed by the elastic member 40, the transmission of the vibration generated in the fuel injection valve 12 to the cylinder head 4 can be further effectively suppressed.

なお、本形態の弾性部材４０は、第２の形態、第３の形態及び第５の形態〜第８の形態のいずれかの形態に適用することができる。 In addition, the elastic member 40 of this form is applicable to any form of a 2nd form, a 3rd form, and a 5th form-an 8th form.

（第１０の形態）
図１２は本発明の第１０の形態に係る燃料噴射装置７Ｊを示した図である。なお、図１２は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図１２に示すように、本形態の燃料噴射装置７Ｊには、小径部１７ａの外周面に装着された状態でシリンダヘッド４と大径部１７ｂとの間に設けられ、かつ気筒２から噴射部１７に伝達した熱をシリンダヘッド４に伝達するばね部材４１が設けられている。ばね部材４１としては、金属製のコイルばねが用いられる。 (10th form)
FIG. 12 is a view showing a fuel injection device 7J according to the tenth embodiment of the present invention. Note that FIG. 12 corresponds to FIG. 2, and parts that are the same as those in FIG. 2 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 12, the fuel injection device 7J of the present embodiment is provided between the cylinder head 4 and the large diameter portion 17b in a state of being mounted on the outer peripheral surface of the small diameter portion 17a, and from the cylinder 2 to the injection portion. A spring member 41 that transmits heat transmitted to the cylinder head 4 to the cylinder head 4 is provided. As the spring member 41, a metal coil spring is used.

本形態においては、燃料噴射弁１２の振動をばね部材４１で吸収することができるので、燃料噴射弁１２の振動のシリンダヘッド４への伝達をさらに効果的に抑えることができる。また、ばね部材４１が小径部１７ａの外周面に装着されているので、気筒２から噴射部１７に伝わる熱をばね部材４１に伝達させてシリンダヘッド４及び大気に放出させることができる。これにより、噴射部１７の過熱を抑えることができるので、気筒２から噴射部１７に熱を受けることで燃料噴射孔（不図示）にデポジットが付着して燃料噴射弁１２の燃料の噴射不良といった不具合が生じる懸念を排除することができる。また、ばね部材４１が金属製であるので噴射部１７の熱を効率よくシリンダヘッド４に伝達することができる。 In this embodiment, since the vibration of the fuel injection valve 12 can be absorbed by the spring member 41, the transmission of the vibration of the fuel injection valve 12 to the cylinder head 4 can be further effectively suppressed. Further, since the spring member 41 is mounted on the outer peripheral surface of the small-diameter portion 17a, the heat transmitted from the cylinder 2 to the injection portion 17 can be transmitted to the spring member 41 and released to the cylinder head 4 and the atmosphere. Thereby, since overheating of the injection part 17 can be suppressed, a deposit adheres to a fuel injection hole (not shown) by receiving heat from the cylinder 2 to the injection part 17, and the fuel injection of the fuel injection valve 12 is poor. It is possible to eliminate the concern that defects occur. Further, since the spring member 41 is made of metal, the heat of the injection unit 17 can be efficiently transmitted to the cylinder head 4.

なお、本形態のばね部材は金属製に限らず、気筒２から噴射部１７に伝達した熱をシリンダヘッド４に伝達することができる限り、適宜に変更することができる。また、本形態のばね部材４１は、第２の形態〜第９の形態のいずれかの形態にも適用することができる。 Note that the spring member of the present embodiment is not limited to metal, and can be appropriately changed as long as the heat transmitted from the cylinder 2 to the injection unit 17 can be transmitted to the cylinder head 4. Moreover, the spring member 41 of this form is applicable also in any form of a 2nd form-a 9th form.

（第１１の形態）
図１３は本発明の第１１の形態に係る燃料噴射装置７Ｋが適用された内燃機関１Ｋの要部を示した図である。なお、図１３は図３に対応しており、上述した図３と共通する部分には同一の参照符号を付し、重複する説明は省略する。図１３に示すように、本形態の燃料噴射装置７Ｋには、デリバリパイプ１３をシリンダヘッド４に固定するための固定装置４２が設けられている。固定装置４２は、受部材３０からデリバリパイプ支持部２８Ｋ及び弾性部材３１を介してシリンダヘッド４のボス部２７Ｋまで延びる第１挿入穴部４３に挿入され、挿入方向と交差する方向に延びる貫通孔４４が形成された第１保持部材４５と、第１挿入穴部４３に連通するようにボス部２７Ｋに形成された第２挿入穴部４６に挿入された状態で第１保持部材４５の貫通孔４４に挿入された第２保持部材４７とを備えている。保持部材４５、４７としては、鉄製の丸棒が利用される。第１保持部材４５は、第１挿入穴部４３に挿入されることによりデリバリパイプ１３Ｋに対して移動不能な状態となる。また、第２保持部材４７は、第２挿入穴部４６に挿入されることによりシリンダヘッド４Ｋに対して移動不能な状態となる。 (Eleventh form)
FIG. 13 is a view showing a main part of an internal combustion engine 1K to which a fuel injection device 7K according to an eleventh aspect of the present invention is applied. Note that FIG. 13 corresponds to FIG. 3, and portions that are the same as those in FIG. 3 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 13, the fuel injection device 7 K of the present embodiment is provided with a fixing device 42 for fixing the delivery pipe 13 to the cylinder head 4. The fixing device 42 is inserted into a first insertion hole 43 extending from the receiving member 30 to the boss 27K of the cylinder head 4 via the delivery pipe support 28K and the elastic member 31, and extends in a direction intersecting the insertion direction. The through hole of the first holding member 45 in a state of being inserted into the first holding member 45 formed with 44 and the second insertion hole portion 46 formed in the boss portion 27K so as to communicate with the first insertion hole portion 43. And a second holding member 47 inserted into 44. As the holding members 45 and 47, iron round bars are used. When the first holding member 45 is inserted into the first insertion hole 43, the first holding member 45 becomes immovable with respect to the delivery pipe 13K. Further, the second holding member 47 becomes immovable with respect to the cylinder head 4 K by being inserted into the second insertion hole 46.

図１４及び図１５に示すように、各保持部材４５、４７は燃料噴射弁１２毎に設けられている。第１保持部材４５のそれぞれは、その一端部を第１連結部材４８で連結することにより一体に構成されている。同様にして、第２保持部材４７のそれぞれは、その一端部を第２連結部材４９で連結することにより一体に構成されている。第２保持部材４７の先端はテーパ状に形成されている。 As shown in FIGS. 14 and 15, each holding member 45, 47 is provided for each fuel injection valve 12. Each of the first holding members 45 is integrally configured by connecting one end portion thereof with a first connecting member 48. Similarly, each of the second holding members 47 is integrally configured by connecting one end thereof with the second connecting member 49. The tip of the second holding member 47 is formed in a tapered shape.

本形態では、第１挿入穴部４３に第１保持部材４５を挿入した後に第２保持部材４７を貫通孔４４に差し込むことにより、第１保持部材４５が第１挿入穴部４３から抜けることを阻止することができる。また、第１保持部材４５は弾性部材３１を圧縮するようにシリンダヘッド４Ｋ側に沈み込むので、その圧縮した弾性部材３１の復元力により第２保持部材４７がデリバリパイプ支持部２８Ｋ側に持ち上げられる。これにより、第２保持部材４７が第２挿入穴部４６から抜けることを阻止することができる。 In this embodiment, the first holding member 45 is removed from the first insertion hole 43 by inserting the second holding member 47 into the through hole 44 after the first holding member 45 is inserted into the first insertion hole 43. Can be blocked. Further, since the first holding member 45 sinks to the cylinder head 4K side so as to compress the elastic member 31, the second holding member 47 is lifted to the delivery pipe support portion 28K side by the restoring force of the compressed elastic member 31. . Thereby, it is possible to prevent the second holding member 47 from coming out of the second insertion hole 46.

本形態においては、保持部材４５、４７を所定の位置に挿入するだけでデリバリパイプ１３Ｋをシリンダヘッド４Ｋに固定することができるので、溶接やボルトなどの固定手段を利用する場合と比較して、デリバリパイプ１３Ｋをシリンダヘッド４Ｋに容易に固定することができる。また、第２保持部材４７の先端をテーパ状に形成しているので、第２保持部材４７の貫通孔４４への差し込みが容易になる。さらに、第１保持部材４５及び第２保持部材４７のそれぞれが連結部材４８、４９により連結されているので、部品点数を少なくすることができる。なお、本形態においては燃料噴射装置７Ｋが保持部１４を備えていない構成であっても同様の効果を得ることができる。 In this embodiment, since the delivery pipe 13K can be fixed to the cylinder head 4K simply by inserting the holding members 45 and 47 into predetermined positions, compared to the case where fixing means such as welding or bolts are used, The delivery pipe 13K can be easily fixed to the cylinder head 4K. In addition, since the tip of the second holding member 47 is formed in a tapered shape, the second holding member 47 can be easily inserted into the through hole 44. Furthermore, since each of the first holding member 45 and the second holding member 47 is connected by the connecting members 48 and 49, the number of parts can be reduced. In the present embodiment, the same effect can be obtained even if the fuel injection device 7K is not provided with the holding portion 14.

（第１２の形態）
図１６は本発明の第１２の形態に係る燃料噴射装置７Ｌが適用された内燃機関１Ｌの要部を示した図である。なお、図１６は図１３に対応しており、上述した図１３と共通する部分には同一の参照符号を付し、重複する説明は省略する。図１６に示すように、本形態では、図１３の第１連結部材４８及び受部材３０が省略され、第１挿入穴部４３が弾性部材３１からシリンダヘッド４Ｋのボス部２７Ｋまでの区間に短縮されている。また、第１保持部材４５Ｌとデリバリパイプ支持部２８Ｌとが一体に形成されている。これにより、図１３の第１連結部材４８及び受部材３０が不要になるので、部品点数が少なくなり、デリバリパイプ１３Ｌのシリンダヘッド４Ｋへの組み付け性を向上させることができる。なお、本形態においては燃料噴射装置７Ｌが保持部１４を備えていない構成であっても同様の効果を得ることができる。 (Twelfth embodiment)
FIG. 16 is a view showing a main part of an internal combustion engine 1L to which a fuel injection device 7L according to a twelfth embodiment of the present invention is applied. Note that FIG. 16 corresponds to FIG. 13, and parts that are the same as those in FIG. 13 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 16, in this embodiment, the first connecting member 48 and the receiving member 30 in FIG. 13 are omitted, and the first insertion hole 43 is shortened to a section from the elastic member 31 to the boss portion 27K of the cylinder head 4K. Has been. Further, the first holding member 45L and the delivery pipe support portion 28L are integrally formed. This eliminates the need for the first connecting member 48 and the receiving member 30 in FIG. 13, thereby reducing the number of parts and improving the assembly of the delivery pipe 13 L to the cylinder head 4 K. In the present embodiment, the same effect can be obtained even if the fuel injection device 7L is not provided with the holding portion 14.

（参考例）
図１７は本発明と関連する参考例に係る燃料噴射装置７Ｍを示した図である。なお、図１７は図２に対応しており、上述した図２と共通する部分には同一の参照符号を付し、重複する説明は省略する。図１７に示すように、本参考例の燃料噴射装置７Ｍには、保持部１４の下板部２６とシリンダヘッド４との間にＯリング５０が設けられている。これにより、内燃機関１の低温始動時の状況でシール部材１９が劣化してシール不足が生じた場合でも、Ｏリング５０によって気筒２内の燃焼ガス漏れを防ぐことができる。 (Reference example)
FIG. 17 is a view showing a fuel injection device 7M according to a reference example related to the present invention. Note that FIG. 17 corresponds to FIG. 2, and parts that are the same as those in FIG. 2 described above are given the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 17, the fuel injection device 7 M of this reference example is provided with an O-ring 50 between the lower plate portion 26 of the holding portion 14 and the cylinder head 4. As a result, even when the seal member 19 is deteriorated due to the low temperature start-up of the internal combustion engine 1 and the seal is insufficient, the O-ring 50 can prevent combustion gas leakage in the cylinder 2.

本発明に係る燃料噴射装置が適用された内燃機関の要部を模式的に示した図。The figure which showed typically the principal part of the internal combustion engine to which the fuel-injection apparatus which concerns on this invention was applied. 図１のIIーII線に沿った断面図。Sectional drawing along the II-II line of FIG. 本発明の第２の形態に係る燃料噴射装置が適用された内燃機関の要部を示した図。The figure which showed the principal part of the internal combustion engine to which the fuel-injection apparatus which concerns on the 2nd form of this invention was applied. 本発明の第３の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 3rd form of this invention. 本発明の第４の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 4th form of this invention. 図５の特徴部を側面から見た図。The figure which looked at the characteristic part of Drawing 5 from the side. 本発明の第５の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 5th form of this invention. 本発明の第６の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 6th form of this invention. 本発明の第７の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 7th form of this invention. 本発明の第８の形態に係る燃料噴射装置の一部を拡大して示した図。The figure which expanded and showed a part of fuel injection device concerning the 8th form of the present invention. 本発明の第９の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 9th form of this invention. 本発明の第１０の形態に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on the 10th form of this invention. 本発明の第１１の形態に係る燃料噴射装置が適用された内燃機関の要部を示した図。The figure which showed the principal part of the internal combustion engine to which the fuel-injection apparatus which concerns on the 11th form of this invention was applied. 第１保持部材を説明するための図。The figure for demonstrating a 1st holding member. 第２保持部材を説明するための図。The figure for demonstrating a 2nd holding member. 本発明の第１２の形態に係る燃料噴射装置が適用された内燃機関の要部を示した図。The figure which showed the principal part of the internal combustion engine to which the fuel-injection apparatus which concerns on the 12th form of this invention was applied. 参考例に係る燃料噴射装置を示した図。The figure which showed the fuel-injection apparatus which concerns on a reference example.

Explanation of symbols

１Ａ、１Ｂ、１Ｋ、１Ｌ内燃機関
２気筒
４、４Ｋシリンダヘッド
４ａシリンダヘッドの外面
７Ａ、７Ｂ、７Ｃ、７Ｄ、７Ｅ、７Ｆ、７Ｇ、７Ｈ、７Ｉ、７Ｊ、７Ｋ、７Ｌ燃料噴射装置
９凹部
１０孔部
１２燃料噴射弁
１３、１３Ｂ、１３Ｈ、１３Ｋ、１３Ｌデリバリパイプ
１４、１４Ｅ、１４Ｆ、１４Ｇ保持部（移動制限手段）
１６本体部
１６ａ孔部の反対側に位置する本体部の端部
１６ｂ本体部下面
１７噴射部
１７ａ小径部
１７ｂ大径部
２０嵌め込み部
２２Ｏリング（シール部材）
２３抜止部
３１弾性部材
３２上側突起部
３３下側突起部
３９絞り部
４１ばね部材
４３、４３Ｌ第１挿入穴部（挿入穴部）
４４貫通孔
４５、４５Ｌ第１保持部材
４７第２保持部材 1A, 1B, 1K, 1L Internal combustion engine 2 cylinder 4, 4K cylinder head 4a Cylinder head outer surface 7A, 7B, 7C, 7D, 7E, 7F, 7G, 7H, 7I, 7J, 7K, 7L Fuel injection device 9 Recess 10 Hole 12 Fuel injection valve 13, 13B, 13H, 13K, 13L Delivery pipe 14, 14E, 14F, 14G Holding part (movement limiting means)
16 Main body portion 16a End portion of main body portion located on opposite side of hole portion 16b Lower surface of main body portion 17 Injection portion 17a Small diameter portion 17b Large diameter portion 20 Fitting portion 22 O-ring (seal member)
23 Detachment part 31 Elastic member 32 Upper projection part 33 Lower projection part 39 Restriction part 41 Spring member 43, 43L First insertion hole part (insertion hole part)
44 Through hole 45, 45L 1st holding member 47 2nd holding member

Claims

A fuel injection valve provided in a hole formed in an outer surface of the cylinder head, a delivery pipe connected to the cylinder head and guiding fuel to the fuel injection valve, and disposed between the cylinder head and the delivery pipe A fuel injection device for an internal combustion engine , comprising: an elastic member formed; and a fixing means for fixing the delivery pipe to the cylinder head .
The fuel injection valve includes an injection portion located in the hole, a main body portion that is formed outside the hole portion and is larger than the hole diameter, and has a lower surface of the main body portion located on the hole side; And the lower surface of the main body portion of the main body portion and the outer surface of the cylinder head are provided in a non-contact state ,
The fixing means is inserted into an insertion hole formed in the cylinder head in a state of being immovable with respect to the delivery pipe, and has a first holding member formed with a through hole extending in a direction intersecting the insertion direction. A second holding member inserted into the through hole in a state of being immovable relative to the cylinder head, and the first holding member sinks toward the cylinder head so as to compress the elastic member. The fuel injection device for an internal combustion engine, wherein the delivery pipe is fixed to the cylinder head by inserting the second holding member into the through hole of the first holding member in a state where the second holding member is inserted .

The delivery pipe is to have a fitting portion which the end portion of the main body portion on the opposite side of the hole is fitted,
The fuel injection system for an internal combustion engine according to claim 1, further comprising a movement limiting means to limit the movement to the cylinder head side of the main body portion provided on the delivery pipe.

The movement control means includes a holding portion that sandwiches the delivery pipe and the main body portion from the longitudinal direction of the fuel injection valve in a state where the end portion of the main body portion is fitted in the fitting portion of the delivery pipe. The holding portion is provided with an upper protrusion that is in contact with the upper end surface of the delivery pipe, and the holding portion is integrated with the fuel injection valve in a direction intersecting the longitudinal direction of the fuel injection valve with respect to the delivery pipe. The fuel injection device for an internal combustion engine according to claim 2, wherein the fuel injector is movably provided, and the upper protrusion is formed so as to be inclined with respect to the upper end surface of the delivery pipe.

The movement control means includes a holding portion that sandwiches the delivery pipe and the main body portion from the longitudinal direction of the fuel injection valve in a state where the end portion of the main body portion is fitted in the fitting portion of the delivery pipe. The holding portion is provided with a lower protrusion that contacts the lower surface of the main body portion of the main body portion, and the holding portion is movable with respect to the fuel injection valve in a direction intersecting the longitudinal direction of the fuel injection valve. The fuel injection device for an internal combustion engine according to claim 2, wherein the lower projection is provided so as to be inclined with respect to a lower surface of the main body portion of the main body portion.

The end portion of the main body portion is formed with a retaining portion that prevents the seal member provided on the outer peripheral surface of the end portion from being detached, and the fitting portion of the delivery pipe is directed toward the retaining portion. The fuel injection device for an internal combustion engine according to any one of claims 2 to 4, wherein a protruding throttle portion is formed.

The injection unit is located in a cylinder of the internal combustion engine, and is provided between the cylinder head and the main body while being mounted on the outer peripheral surface of the injection unit, and is transmitted from the cylinder to the injection unit. The fuel injection device for an internal combustion engine according to any one of claims 1 to 5, further comprising a spring member that transmits the heat generated to the cylinder head.