JP2005147075A - Fuel delivery pipe - Google Patents
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- JP2005147075A JP2005147075A JP2003388991A JP2003388991A JP2005147075A JP 2005147075 A JP2005147075 A JP 2005147075A JP 2003388991 A JP2003388991 A JP 2003388991A JP 2003388991 A JP2003388991 A JP 2003388991A JP 2005147075 A JP2005147075 A JP 2005147075A
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本発明は、電子燃料噴射式自動車用エンジンの燃料加圧ポンプから送給された燃料を、エンジンの吸気管やシリンダー内にインジェクターを介して供給するためのフューエルデリバリパイプに係るもので、フューエルデリバリ本体の外周壁の壁面に対して燃料のインジェクターを傾斜させて配置する事を可能とし、フューエルデリバリパイプの収納効率を向上させる事を目的とするものである。 The present invention relates to a fuel delivery pipe for supplying fuel fed from a fuel pressurizing pump of an electronic fuel injection type automobile engine into an intake pipe or a cylinder of the engine via an injector. An object of the present invention is to make it possible to dispose the fuel injector so as to be inclined with respect to the wall surface of the outer peripheral wall of the main body, and to improve the storage efficiency of the fuel delivery pipe.
従来、特許文献1〜特許文献6に示す如く、複数のインジェクターを設けてエンジンの複数の吸気管や気筒内にガソリン等の燃料を供給するフューエルデリバリパイプが知られている。このような、一般的なインジェクターホルダー(1)は、図5に示す従来例1の如く、有底の筒形ホルダー部(2)の上壁(3)中央に、燃料導入口(6)を設け、この燃料導入口(6)の外方に、燃料供給管(7)を上壁(3)と直角方向に突出形成している。そして、この燃料供給管(7)を、フューエルデリバリ本体(4)の外周壁(5)に設けた燃料導出口(8)に、外周壁(5)の壁面と直角に挿入固定するとともに、上壁(3)の外面を外周壁(5)に平行に密着させ、ろう付けや溶接等により固定している。そして、このインジェクターホルダー(1)のホルダー部(2)内に、インジェクター(図示せず)を挿入接続している。
Conventionally, as shown in
従って、従来例1ではインジェクターは、フューエルデリバリ本体(4)の外周壁(5)に対して直角方向の延長線上に配置されるものとなる。しかし、このようなフューエルデリバリ本体(4)、インジェクターのレイアウト構成では、フューエルデリバリパイプ全体の配置角度は燃料の噴射方向に対して90°となる一定角度となってエンジンルーム内部での設置場所が制限され、レイアウトの自由度が低かった。 Therefore, in the prior art example 1, the injector is arranged on an extension line in a direction perpendicular to the outer peripheral wall (5) of the fuel delivery body (4). However, in such a layout configuration of the fuel delivery body (4) and the injector, the arrangement angle of the entire fuel delivery pipe is a constant angle of 90 ° with respect to the fuel injection direction, and the installation place inside the engine room is It was limited and the degree of freedom of layout was low.
特に、V型エンジン等の場合は、設置空間、レイアウト等の制限により、吸気管がそれぞれ交差し、傾斜してシリンダーのヘッドに接続される場合が多く、それに伴い、インジェクターもフューエルデリバリ本体(4)の軸芯方向に対して傾斜して接続された設計のエンジンも存在する。このインジェクターを傾斜して接続可能とするための、インジェクターホルダー(1)の従来例2〜4を図6〜図8に示す。 In particular, in the case of a V-type engine or the like, due to restrictions on installation space, layout, etc., the intake pipes often intersect and incline and are connected to the cylinder head, and accordingly, the injector also has a fuel delivery body (4 There is also an engine with a design that is connected to be inclined with respect to the axial direction. Conventional examples 2 to 4 of the injector holder (1) for allowing the injector to be inclined and connected are shown in FIGS.
まず、図6に示す従来例2では、ホルダー部(2)の側面に燃料導入口(6)を設け、この燃料導入口(6)に管状のスペーサー(9)をろう付けや溶接等により接続固定し、このスペーサー(9)を、フューエルデリバリ本体(4)の外周壁(5)に設けた燃料導出口(8)の外面に、該外周壁(5)に対しては直角であるが、ホルダー部(2)の軸芯は、フューエルデリバリ本体(4)の軸芯に対して傾斜した方向に接続固定している。このスペーサー(9)の使用により、図6に示す如く、フューエルデリバリ本体(4)の壁面に、インジェクターホルダー(1)を傾斜させて配設させ、それによって、フューエルデリバリ本体(4)の上面から見た場合にフューエルデリバリ本体(4)の軸芯に対して傾斜するとともに、側面から見た場合にもフューエルデリバリ本体(4)の軸芯に対して傾斜した状態で、インジェクターを接続可能となっている。 First, in the conventional example 2 shown in FIG. 6, a fuel introduction port (6) is provided on the side surface of the holder (2), and a tubular spacer (9) is connected to the fuel introduction port (6) by brazing or welding. The spacer (9) is fixed to the outer surface of the fuel outlet (8) provided in the outer peripheral wall (5) of the fuel delivery body (4), and is perpendicular to the outer peripheral wall (5). The axis of the holder part (2) is connected and fixed in a direction inclined with respect to the axis of the fuel delivery body (4). By using this spacer (9), as shown in FIG. 6, the injector holder (1) is inclined and arranged on the wall surface of the fuel delivery body (4), so that the fuel delivery body (4) can be removed from the upper surface. When viewed, the injector can be connected while tilting with respect to the axis of the fuel delivery body (4) and tilted with respect to the axis of the fuel delivery body (4) when viewed from the side. ing.
また、図7、図8に示す従来例3では、ホルダー部(2)の上壁(3)に設けた燃料導入口(6)に、上壁(3)に対して直角で長尺な燃料供給管(7)を突設している。この燃料供給管(7)を、図7に示す如く、フューエルデリバリ本体(4)の燃料導出口(8)に、外周壁(5)に対して直角方向に挿入し、双方をろう付けや溶接等により接続固定している。この時点では、燃料供給管(7)及びホルダー部(2)は、フューエルデリバリ本体(4)の外周壁(5)に対して直角方向に配置されている。そして、次工程で、図8に示す如く、燃料供給管(7)を屈曲変形させる事により、ホルダー部(2)をフューエルデリバリ本体(4)の外周壁(5)壁面に傾斜させて配置するものである。尚、他の異なる接続手段として、燃料供給管(7)を予め屈曲変形させ、この屈曲変形によりホルダー部(2)の傾斜方向を維持した状態で、燃料供給管(7)を外周壁(5)に接続固定する手段もある。また、この場合も、ホルダー部(2)は、上面から見た場合にフューエルデリバリ本体(4)の軸芯と平行であるが、側面から見た場合にはフューエルデリバリ本体(4)の軸芯に対して傾斜して配置されたものも存在するし、上面及び側面の双方に於いてフューエルデリバリ本体(4)の軸芯に対して傾斜して配置されたものも存在する。 Further, in the conventional example 3 shown in FIG. 7 and FIG. 8, the fuel inlet (6) provided in the upper wall (3) of the holder part (2) is long and perpendicular to the upper wall (3). The supply pipe (7) is projected. As shown in FIG. 7, the fuel supply pipe (7) is inserted into the fuel outlet (8) of the fuel delivery body (4) in a direction perpendicular to the outer peripheral wall (5), and both are brazed or welded. The connection is fixed by etc. At this time, the fuel supply pipe (7) and the holder part (2) are arranged in a direction perpendicular to the outer peripheral wall (5) of the fuel delivery body (4). Then, in the next step, as shown in FIG. 8, the fuel supply pipe (7) is bent and deformed so that the holder portion (2) is inclined to the outer peripheral wall (5) wall surface of the fuel delivery body (4). Is. As another different connecting means, the fuel supply pipe (7) is bent and deformed in advance, and the inclined direction of the holder portion (2) is maintained by this bending deformation, and the fuel supply pipe (7) is connected to the outer peripheral wall (5). There is also a means to fix the connection to. Also in this case, the holder portion (2) is parallel to the axis of the fuel delivery body (4) when viewed from the top surface, but the axis of the fuel delivery body (4) when viewed from the side surface. Some of them are arranged to be inclined with respect to the axial center of the fuel delivery body (4) on both the upper surface and the side surface.
また、図9に示す従来例4では、インジェクターホルダー(1)に燃料供給管(7)を設けずに形成するとともに上壁(3)に対して、ホルダー部(2)を傾斜させて形成している。また、上壁(3)の中央に燃料導入口(6)を設けるとともに、フューエルデリバリ本体(4)の外周壁(5)には、燃料導出口(8)を複数個直列に設けている。そして、この燃料導出口(8)に臨ませて燃料導入口(6)を配置させながら、外周壁(5)の外面にインジェクターホルダー(1)の上壁(3)を当接し、TIG溶接、プラズマ溶接等により仮付けする事で、燃料導出口(8)と燃料導入口(6)とを連通させ、フューエルデリバリ本体(4)からインジェクターへの燃料供給を可能としている。そして、インジェクターホルダー(1)の外周とフューエルデリバリ本体(4)とを、ろう付け又は溶接により互いに固定している。
しかしながら、図6に示す従来例2の如くスペーサー(9)を使用したものでは、ろう付け又は溶接等の作業工程及び部品点数が増え、コスト高となる可能性があった。また、スペーサー(9)と、上壁(3)及び外周壁(5)とのろう付け又は溶接面積が少なく、フューエルデリバリ本体(4)とインジェクターホルダー(1)の接続強度や振動等に対する耐久性にも問題があった。 However, in the case where the spacer (9) is used as in the conventional example 2 shown in FIG. 6, there is a possibility that the work process such as brazing or welding and the number of parts are increased and the cost is increased. In addition, the brazing or welding area between the spacer (9) and the upper wall (3) and the outer peripheral wall (5) is small, and the connection strength between the fuel delivery body (4) and the injector holder (1) and durability against vibrations, etc. There was also a problem.
また、図7、図8に示す従来例3では、フューエルデリバリ本体(4)の外周壁(5)へのインジェクターホルダー(1)の取付け後に、燃料供給管(7)を屈曲変形させる際に、ホルダー部(2)までが変形して円筒の真円度等の寸法精度に問題を生じ、ホルダー部(2)にインジェクターを接続した際の気密性や接続強度が低下する虞があった。また、燃料供給管(7)をフューエルデリバリ本体(4)の外周壁(5)にろう付け等により接続するだけで、上壁(3)を外周壁(5)に密着固定させていないので、インジェクターホルダー(1)の接続強度や安定性にも問題があり、燃料噴射時の脈動等への耐久性が低下する虞があった。また、屈曲変形させるために燃料供給管(7)の形成長さは長寸とならざるを得ず、フューエルデリバリパイプ全体が嵩高で大きな容積を必要とし、レイアウト性が極めて悪かった。 7 and 8, when the fuel supply pipe (7) is bent and deformed after the injector holder (1) is attached to the outer peripheral wall (5) of the fuel delivery body (4), The holder part (2) may be deformed to cause a problem in the dimensional accuracy such as the roundness of the cylinder, and there is a possibility that the airtightness and the connection strength when the injector is connected to the holder part (2) are lowered. In addition, the fuel supply pipe (7) is simply connected to the outer peripheral wall (5) of the fuel delivery body (4) by brazing or the like, and the upper wall (3) is not tightly fixed to the outer peripheral wall (5). There is also a problem in the connection strength and stability of the injector holder (1), and there is a possibility that durability against pulsation and the like during fuel injection may be reduced. In addition, the length of the fuel supply pipe (7) must be long in order to bend and deform, and the entire fuel delivery pipe is bulky and requires a large volume, so that the layout is extremely poor.
また、図9に示す従来例4では、フューエルデリバリ本体(4)へのインジェクターホルダー(1)の位置合わせを、特に精密な手段で行ってはおらず、内径の異なる燃料導出口(8)に臨ませて燃料導入口(6)を配置させているだけなので、互いの中心軸にズレを生じる事がある。そのため、燃料導出口(8)と燃料導入口(6)を介したインジェクターへの円滑な燃料供給に支障を来す場合がある。 Further, in the conventional example 4 shown in FIG. 9, the injector holder (1) is not positioned with respect to the fuel delivery body (4) by any particularly precise means, and the fuel outlet (8) having a different inner diameter is faced. Since only the fuel introduction port (6) is arranged, there is a possibility that the center axis of each other is displaced. For this reason, there may be a problem in the smooth fuel supply to the injector through the fuel outlet (8) and the fuel inlet (6).
本発明は上述の如き問題を解決するため、フューエルデリバリ本体に対して傾斜してインジェクターホルダーを接続固定する際に、インジェクターホルダーの真円度等の寸法精度を高めるとともに、互いの位置合わせを高精度に行って、インジェクターを接続保持した際の気密性や接続強度を向上させ、円滑で正確な噴射角度の燃料噴射を可能とするものである。また、フューエルデリバリ本体とインジェクターホルダーとの接続強度を高め、フューエルデリバリ本体の振動や燃料流動時の脈動等への耐久性を向上させるものである。また、フューエルデリバリ本体とインジェクターホルダーとの精密な固定作業を、高度な製作技術を必要とする事なく簡易に行って、フューエルデリバリパイプの生産性を高めるものである。また、フューエルデリバリパイプの高さ方向の嵩を小さくして、高いレイアウト性を確保するものである。 In order to solve the above-described problems, the present invention increases the dimensional accuracy such as the roundness of the injector holder and increases the alignment with each other when the injector holder is connected and fixed with an inclination to the fuel delivery body. It is accurate and improves the airtightness and connection strength when the injector is connected and held, and enables fuel injection at a smooth and accurate injection angle. In addition, the strength of the connection between the fuel delivery body and the injector holder is increased, and the durability against vibration of the fuel delivery body and pulsation during fuel flow is improved. In addition, precise fixing work between the fuel delivery body and the injector holder is easily performed without the need for advanced manufacturing techniques, thereby increasing the productivity of the fuel delivery pipe. Moreover, the bulk of the fuel delivery pipe in the height direction is reduced to ensure high layout performance.
本発明は上述の如き課題を解決するため、第1の発明は、フューエルデリバリ本体内の燃料をエンジンの吸気管やシリンダーに噴射するインジェクターを接続するインジェクターホルダーを設けたフューエルデリバリパイプに於いて、インジェクターホルダーのホルダー部の上壁外面をフューエルデリバリ本体の外周壁外面に密着固定した状態で、上壁の燃料導入口と外周壁の燃料導出口とを連通するとともに上壁の燃料導入口の外面に、燃料供給管を外周壁の壁面に対して直角に突出形成し、この燃料供給管を外周壁の燃料導出口に挿入固定し、且つこの燃料供給管の中心軸に対してホルダー部の中心軸を傾斜させて成るものである。 In order to solve the above-mentioned problems, the first invention is a fuel delivery pipe provided with an injector holder for connecting an injector for injecting fuel in a fuel delivery main body to an intake pipe or a cylinder of an engine. With the upper wall outer surface of the holder part of the injector holder in close contact with the outer surface of the outer surface of the fuel delivery body, the fuel inlet on the upper wall and the fuel outlet on the outer wall communicate with each other and the outer surface of the fuel inlet on the upper wall The fuel supply pipe is formed so as to project at right angles to the wall surface of the outer peripheral wall, the fuel supply pipe is inserted and fixed in the fuel outlet port of the outer peripheral wall, and the center of the holder portion is centered on the central axis of the fuel supply pipe. The shaft is inclined.
また、第2の発明は、フューエルデリバリ本体内の燃料をエンジンの吸気管やシリンダーに噴射するインジェクターを接続するインジェクターホルダーを設けたフューエルデリバリパイプに於いて、インジェクターホルダーのホルダー部の上壁外面をフューエルデリバリ本体の外周壁外面に密着固定した状態で、上壁の燃料導入口と外周壁の燃料導出口とを連通するとともに外周壁の燃料導出口の外面に、燃料供給管を外周壁の壁面に対して直角な外方に突出形成するとともに、この燃料供給管を上壁の燃料導入口に挿入固定し、且つこの燃料供給管の中心軸に対してホルダー部の中心軸を傾斜させて成るものである。 Further, the second invention is a fuel delivery pipe provided with an injector holder for connecting an injector for injecting fuel in the fuel delivery main body into an intake pipe or a cylinder of the engine, wherein the outer surface of the upper wall of the holder portion of the injector holder is provided. With the fuel delivery body in close contact with the outer surface of the outer peripheral wall, the fuel inlet on the upper wall communicates with the fuel outlet on the outer peripheral wall, and the fuel supply pipe is connected to the outer surface of the fuel outlet on the outer peripheral wall. The fuel supply pipe is inserted into and fixed to the fuel introduction port on the upper wall, and the central axis of the holder portion is inclined with respect to the central axis of the fuel supply pipe. Is.
また、燃料導入口は、上壁の中心よりもホルダー部の傾斜方向寄りの偏心位置に配置し、燃料供給管の内周面の延長線よりも、インジェクターホルダーの開口部の内端面が外方に位置する寸法合わせで形成しても良い。 The fuel inlet is located at an eccentric position nearer to the tilt direction of the holder part than the center of the upper wall, and the inner end face of the opening of the injector holder is outward from the extension line of the inner peripheral face of the fuel supply pipe. You may form by the dimension alignment located in this.
本発明は上述の如く構成したもので、インジェクターホルダーのホルダー部を予め傾斜させているので、インジェクターホルダーの取付後に燃料供給管やホルダー部の屈曲変形等を行う必要がなく、インジェクターホルダーの歪み等を防止して、真円度等の寸法精度を高める事ができる。従って、インジェクターホルダーとインジェクターとの接続部に燃料漏れのない高い気密性及び接続強度を得る事ができるとともに、傾斜した吸気管やシリンダーにインジェクターを所望角度で接続する事ができ、円滑で正確な噴射角度の燃料噴射を行う事が可能となる。 The present invention is configured as described above, and since the holder portion of the injector holder is inclined in advance, it is not necessary to bend or deform the fuel supply pipe or the holder portion after the injector holder is mounted. And the dimensional accuracy such as roundness can be improved. Therefore, it is possible to obtain high airtightness and connection strength with no fuel leakage at the connection between the injector holder and the injector, and to connect the injector to the inclined intake pipe or cylinder at a desired angle, which is smooth and accurate. It is possible to perform fuel injection at an injection angle.
また、上壁を外周壁に密着固定しているので、インジェクターホルダーとフューエルデリバリ本体との接続強度も向上し、燃料噴射時の脈動やフューエルデリバリ本体の振動等に対する耐久性が向上するものとなる。また、上壁又は外周壁に突設した燃料供給管を、外周壁の燃料導出口又は上壁の燃料導入口に挿入するので、フューエルデリバリ本体へのインジェクターホルダーの固定時の位置合わせを、高度な製作技術を必要とする事なく、しかも高精度に行え、高品質な製品を低コストに形成する事が可能となる。また、インジェクターの傾斜配置が可能となる事により、フューエルデリバリパイプの嵩張りを押さえる事ができ、狭い空間等でも設置が可能なレイアウトの自由度の高いフューエルデリバリパイプを得る事ができる。 In addition, since the upper wall is tightly fixed to the outer peripheral wall, the connection strength between the injector holder and the fuel delivery body is improved, and the durability against pulsation during fuel injection, vibration of the fuel delivery body, etc. is improved. . In addition, the fuel supply pipe projecting from the upper wall or outer peripheral wall is inserted into the fuel outlet port on the outer peripheral wall or the fuel inlet port on the upper wall, so that the positioning when the injector holder is fixed to the fuel delivery body can be Therefore, it is possible to form a high-quality product at a low cost without requiring a special manufacturing technique. In addition, since the injectors can be inclined, the bulk of the fuel delivery pipe can be suppressed, and a fuel delivery pipe having a high degree of freedom in layout that can be installed in a narrow space or the like can be obtained.
以下、本発明のフューエルデリバリパイプの実施例1を図1〜図3に基づいて詳細に説明すれば、(10)は管軸に対して直角方向の断面形状を円形、長円形、矩形等とするフューエルデリバリ本体で、一端に燃料導入管(図示せず)が接続され、この燃料導入管は、床下配管(図示せず)を介して燃料タンク(図示せず)に連結されている。そして、この燃料タンクの燃料が床下配管を介して燃料導入管に移送され、燃料導入管からフューエルデリバリ本体(10)へと流動し、インジェクター(図示せず)から吸気管やシリンダー内に噴射される。 Hereinafter, the fuel delivery pipe according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. (10) is a cross-sectional shape perpendicular to the tube axis. The fuel delivery main body is connected to a fuel introduction pipe (not shown) at one end, and this fuel introduction pipe is connected to a fuel tank (not shown) via an underfloor pipe (not shown). Then, the fuel in the fuel tank is transferred to the fuel introduction pipe through the underfloor pipe, flows from the fuel introduction pipe to the fuel delivery body (10), and is injected from the injector (not shown) into the intake pipe and the cylinder. The
また、フューエルデリバリ本体(10)は、外周壁(11)の壁面に、前記インジェクターを接続可能とするインジェクターホルダー(12)を複数設けている。例えば4気筒エンジンの場合には4個のインジェクターホルダー(12)が、直列6気筒エンジンの場合には6個のインジェクターホルダー(12)が所望間隔と角度で設けられている。また、V型エンジン等の場合は、設置空間、レイアウト等の制限により、シリンダーの各々を交差させ、この交差させたシリンダーとの連結のため、インジェクターホルダー(12)をフューエルデリバリ本体(10)の軸芯に対して、側面から見た場合には傾斜しているが、上面から見た場合には平行となるように接続するか、或いは上面から見た場合と側面から見た場合の双方に於いてフューエルデリバリ本体(4)の軸芯に対して傾斜させて接続する構造としているものもある。 In addition, the fuel delivery body (10) is provided with a plurality of injector holders (12) on the wall surface of the outer peripheral wall (11) that allow the injectors to be connected. For example, in the case of a 4-cylinder engine, four injector holders (12) are provided at a desired interval and angle in the case of an in-line 6-cylinder engine. In the case of a V-type engine, etc., due to restrictions on installation space, layout, etc., the cylinders are crossed, and the injector holder (12) is connected to the fuel delivery body (10) for connection with the crossed cylinders. It is inclined when viewed from the side with respect to the shaft core, but it is connected so as to be parallel when viewed from the top, or both when viewed from the top and from the side. In some cases, however, the fuel delivery body (4) is connected to be inclined with respect to the axis.
この傾斜した接続を可能とするための本実施例のインジェクターホルダー(12)は、インジェクターを内部に接続保持するホルダー部(13)を備え、その上壁(14)をフューエルデリバリ本体(10)の外周壁(11)にろう付けや溶接等により密着固定するものである。そして、この上壁(14)に、燃料導入口(15)を設け、この燃料導入口(15)の外面に、フューエルデリバリ本体(10)の外周壁(11)に対して直角に配設する燃料供給管(16)を、上壁(14)と一体に成形し接続固定している。この燃料供給管(16)は、外周壁(11)の燃料導出口(17)内に挿入可能とするとともに、この燃料導出口(17)の内径よりも燃料供給管(16)の外径を僅かに大径として、この燃料供給管(16)を燃料導入口(17)に圧入し、燃料導出口(17)の内端面により挟持させる事で、ろう付けや溶接による固定までの間に、不用意に脱落する事のない程度の保持力で燃料供給管(16)を保持して、仮付け溶接等の省略を可能としている。 The injector holder (12) of the present embodiment for enabling the inclined connection includes a holder portion (13) for connecting and holding the injector inside, and the upper wall (14) of the injector holder (10) of the fuel delivery body (10). It is tightly fixed to the outer peripheral wall (11) by brazing or welding. The upper wall (14) is provided with a fuel introduction port (15), and disposed on the outer surface of the fuel introduction port (15) at a right angle to the outer peripheral wall (11) of the fuel delivery body (10). The fuel supply pipe (16) is formed integrally with the upper wall (14) and connected and fixed. The fuel supply pipe (16) can be inserted into the fuel outlet (17) of the outer peripheral wall (11), and the outer diameter of the fuel supply pipe (16) is made larger than the inner diameter of the fuel outlet (17). With a slightly larger diameter, this fuel supply pipe (16) is press-fitted into the fuel inlet (17) and is held between the inner end surfaces of the fuel outlet (17) until brazing or fixing by welding, The fuel supply pipe (16) is held with a holding force that does not drop out carelessly, so that tack welding or the like can be omitted.
また、インジェクターホルダー(12)は、上壁(14)を外周壁(11)に密着固定した状態で、図1に示す如く、燃料供給管(16)の中心軸に対してホルダー部(13)の中心軸が傾斜するような構成で形成している。更に、燃料導入口(15)及びこれと連通する燃料供給管(16)は、上壁(14)の中心よりもホルダー部(13)の傾斜方向寄りの偏心位置に設け、図1に一点鎖線で示す如く、燃料導入口(15)の内周面延長線よりも、ホルダー部(13)の開口部(18)の内端面が、外方に位置するような寸法合わせで形成している。 The injector holder (12) has a holder portion (13) with respect to the central axis of the fuel supply pipe (16) as shown in FIG. 1, with the upper wall (14) being closely fixed to the outer peripheral wall (11). The central axis is inclined. Further, the fuel introduction port (15) and the fuel supply pipe (16) communicating with the fuel introduction port (15) are provided at an eccentric position closer to the inclination direction of the holder portion (13) than the center of the upper wall (14). As shown, the inner end surface of the opening portion (18) of the holder portion (13) is formed so as to be positioned outside the extension line of the inner peripheral surface of the fuel introduction port (15).
上記インジェクターホルダー(12)をフューエルデリバリ本体(10)に接続固定するには、図2に示す如く、まず外周壁(11)の燃料導出口(17)内に、この燃料導出口(17)よりも僅かに大径な燃料供給管(16)をポンチ等の工具(20)を用いて圧入する事により、フューエルデリバリ本体(10)とインジェクターホルダー(12)とが仮付けされる。このように、燃料導出口(17)内に燃料供給管(16)を圧入するので、互いの位置合わせを高精度に行う事ができ、燃料導出口(17)と燃料導入口(15)とが同軸線上に配置されるとともに、燃料導出口(17)からの燃料供給管(16)の不用意な脱落が防止され、接続作業を効率的に行う事ができる。 In order to connect and fix the injector holder (12) to the fuel delivery body (10), as shown in FIG. 2, first, the fuel outlet (17) of the outer peripheral wall (11) is inserted into the fuel outlet (17). However, the fuel delivery main body (10) and the injector holder (12) are temporarily attached by press-fitting a slightly larger diameter fuel supply pipe (16) using a tool (20) such as a punch. Thus, since the fuel supply pipe (16) is press-fitted into the fuel outlet (17), the mutual alignment can be performed with high accuracy, and the fuel outlet (17) and the fuel inlet (15) Are arranged on the coaxial line, and the fuel supply pipe (16) is prevented from being accidentally dropped from the fuel outlet (17), so that the connection work can be performed efficiently.
また、燃料導入口(15)を上壁(14)の偏心位置に設ける事により、燃料供給管(16)の内周面の延長線よりもホルダー部(13)の開口部(18)を外方に配置しているので、ポンチ等の工具(20)を傾きなどを生じる事なく燃料供給管(16)の軸線に平行に圧入する事が可能となり、部材の歪みや変形、不用意な傾き等を良好に防止して、ホルダー部(13)、その他の真円度や位置合わせ精度を高めて、精密な製作が可能となる。 Also, by providing the fuel introduction port (15) at the eccentric position of the upper wall (14), the opening (18) of the holder part (13) is located outside the extension line of the inner peripheral surface of the fuel supply pipe (16). It is possible to press the tool (20), such as a punch, in parallel to the axis of the fuel supply pipe (16) without inclining it, causing distortion or deformation of the member, inadvertent inclination. Etc. can be prevented well, and the precision of the holder part (13) and other roundness and alignment accuracy can be improved.
次に、インジェクターホルダー(12)の上壁(14)及び燃料供給管(16)の外周面を、フューエルデリバリ本体(10)の外周壁(11)にろう付け又は溶接により固定するが、上壁(14)を外周壁(11)に平行に密着させる事ができ、広い接触面積での安定した固定が可能となる。従って、フューエルデリバリ本体(10)の振動や燃料の噴射時の衝撃等に対するインジェクターホルダー(12)の耐久性が高まり、インジェクターからの燃料噴射を円滑に行う事ができる。 Next, the upper wall (14) of the injector holder (12) and the outer peripheral surface of the fuel supply pipe (16) are fixed to the outer peripheral wall (11) of the fuel delivery body (10) by brazing or welding. (14) can be brought into close contact with the outer peripheral wall (11) in parallel, and stable fixation with a wide contact area becomes possible. Accordingly, the durability of the injector holder (12) against vibrations of the fuel delivery main body (10), impact at the time of fuel injection, and the like is increased, and fuel injection from the injector can be performed smoothly.
上述の如き工程により、図1に示す如く、フューエルデリバリ本体(10)の外周壁(11)に対して、燃料供給管(16)が直角に配置され、ホルダー部(13)は傾斜して配置される。このようなホルダー部(13)に、インジェクターを接続する事により、外周壁(11)の壁面に対してインジェクターを傾斜して接続する事が可能となり、傾斜した吸気管やシリンダーにインジェクターを所望角度で接続する事ができる。従って、フューエルデリバリパイプ全体をコンパクトで嵩張らないものとする事ができ、狭い空間でも設置が可能で、レイアウトの自由度の高いものとなる。 As shown in FIG. 1, the fuel supply pipe (16) is arranged at a right angle with respect to the outer peripheral wall (11) of the fuel delivery body (10) and the holder part (13) is inclined as shown in FIG. Is done. By connecting the injector to such a holder (13), it is possible to connect the injector to the wall surface of the outer peripheral wall (11) at an angle, and the injector can be connected to the inclined intake pipe or cylinder at a desired angle. Can be connected. Therefore, the entire fuel delivery pipe can be made compact and not bulky, can be installed even in a narrow space, and has a high degree of freedom in layout.
また、前述の如くホルダー部(13)の真円度が高いので、インジェクターを高い気密性で強固に接続保持する事ができる。そして、フューエルデリバリ本体(10)内の燃料は燃料導出口(17)を介して燃料供給管(16)に流入し、ホルダー部(13)のインジェクターに供給され、このインジェクターから吸気管やシリンダー内に、円滑に燃料を噴射する事ができる。 Further, since the roundness of the holder portion (13) is high as described above, the injector can be firmly connected and held with high airtightness. The fuel in the fuel delivery body (10) flows into the fuel supply pipe (16) through the fuel outlet (17) and is supplied to the injector of the holder section (13). In addition, fuel can be injected smoothly.
尚、実施例1のインジェクターホルダー(12)では、燃料導入口(15)を上壁(14)の偏心位置に設け、燃料供給管(16)の内周面の延長線よりもホルダー部(13)の開口部(18)が外方に位置するような寸法合わせで形成しているが、必ずしも延長線よりも外方に位置するよう開口部(18)を設ける必要はなく、例えばく字形の屈曲した工具(20)等を使用して、燃料供給管(16)を燃料導出口(17)内に圧入する事ができる。この場合でも、燃料供給管(16)と燃料導出口(17)の位置合わせを高精度に行う事ができる。 In the injector holder (12) of the first embodiment, the fuel introduction port (15) is provided at an eccentric position of the upper wall (14), and the holder portion (13 However, it is not always necessary to provide the opening (18) so as to be positioned outward from the extension line. Using the bent tool (20) or the like, the fuel supply pipe (16) can be press-fitted into the fuel outlet (17). Even in this case, the fuel supply pipe (16) and the fuel outlet (17) can be aligned with high accuracy.
図3に示す実施例2では、インジェクターホルダー(12)の上壁(14)に於いて、燃料導入口(15)を設けた側とは点対称な幅広側で、上壁(14)とホルダー部(13)の壁面との間のRを小さくして、実施例1よりも上壁(14)の表面積を広く形成している。そして、この広面積な上壁(14)を外周壁(11)にろう付けや溶接により密着固定する事により、フューエルデリバリ本体(10)とインジェクターホルダー(12)との、より強固で安定した接続が可能となり、インジェクターからの燃料噴射も更に円滑に行う事ができる。 In the second embodiment shown in FIG. 3, the upper wall (14) of the injector holder (12) has a wide side that is point-symmetric with the side where the fuel introduction port (15) is provided, and the upper wall (14) and the holder. R between the wall surface of the part (13) is made small, and the surface area of the upper wall (14) is made wider than that of the first embodiment. And, by fixing this wide upper wall (14) to the outer peripheral wall (11) by brazing or welding, a stronger and more stable connection between the fuel delivery body (10) and the injector holder (12) The fuel injection from the injector can be performed more smoothly.
上記実施例1、2では、インジェクターホルダー(12)の上壁(14)の外面に、燃料供給管(16)を一体に設けているが、図4に示す実施例3では、燃料供給管(16)をフューエルデリバリ本体(10)の外周壁(11)に設けている。この外周壁(11)に突設する燃料供給管(16)は、燃料導出口(17)外面に、外周壁(11)に対して直角な外方に一体に突出形成するとともに、この燃料供給管(16)の外径を、上壁(14)の燃料導入口(15)の内径よりも僅かに大径に形成している。そして、インジェクターホルダー(12)をフューエルデリバリ本体(10)に接続固定する際には、外周壁(11)に突設した燃料供給管(16)を、インジェクターホルダー(12)の上壁(14)に設けた燃料導入口(15)に圧入する事により、双方を仮付けする。 In the first and second embodiments, the fuel supply pipe (16) is integrally provided on the outer surface of the upper wall (14) of the injector holder (12). However, in the third embodiment shown in FIG. 16) is provided on the outer peripheral wall (11) of the fuel delivery body (10). The fuel supply pipe (16) protruding from the outer peripheral wall (11) is integrally formed on the outer surface of the fuel outlet port (17) so as to protrude outwardly at right angles to the outer peripheral wall (11). The outer diameter of the pipe (16) is formed slightly larger than the inner diameter of the fuel introduction port (15) of the upper wall (14). When the injector holder (12) is connected and fixed to the fuel delivery body (10), the fuel supply pipe (16) protruding from the outer peripheral wall (11) is connected to the upper wall (14) of the injector holder (12). Both are temporarily attached by press-fitting into the fuel introduction port (15) provided in.
また、この実施例3でも、燃料導入口(15)を上壁(14)の偏心位置に設け、燃料供給管(16)の内周面の延長線よりもホルダー部(13)の開口部(18)が外方に位置するような寸法合わせで形成している。これにより、開口部(18)を介して燃料供給管(16)内に工具(20)を挿入し易いものとなり、フューエルデリバリ本体(10)とインジェクターホルダー(12)との仮付け作業等を、精密且つ容易に行う事が可能となる。そして、上壁(14)を外周壁(11)と燃料供給管(16)の外周にろう付け又は溶接等により密着固定する事により、インジェクターホルダー(12)の接続強度と接続安定性が高く耐久性に優れるものとなるとともに、真円度等の寸法精度も高く、インジェクターの接続保持を、高い気密性と接続強度で行う事ができる。 Also in the third embodiment, the fuel introduction port (15) is provided at the eccentric position of the upper wall (14), and the opening portion (13) of the holder portion (13) is more than the extension line of the inner peripheral surface of the fuel supply pipe (16). 18) is dimensionally aligned so that it is located outward. As a result, the tool (20) can be easily inserted into the fuel supply pipe (16) through the opening (18), and the temporary attachment work between the fuel delivery body (10) and the injector holder (12), etc. It becomes possible to carry out precisely and easily. The upper wall (14) is firmly fixed to the outer periphery of the outer peripheral wall (11) and the fuel supply pipe (16) by brazing or welding, so that the connection strength and connection stability of the injector holder (12) are high and durable. In addition to being excellent in performance, the dimensional accuracy such as roundness is also high, and the connection of the injector can be maintained with high airtightness and connection strength.
尚、燃料供給管(16)の形成長さは、上記実施例1、2では、外周壁(11)の肉厚よりも長く形成し、実施例3では、上壁(14)の肉厚よりも長く形成しているが、他の異なる実施例として、燃料供給管(16)の形成長さを、外周壁(11)又は上壁(14)の肉厚と同程度としても良い。 The length of the fuel supply pipe (16) is longer than the thickness of the outer peripheral wall (11) in the first and second embodiments, and the thickness of the upper wall (14) in the third embodiment. However, as another different embodiment, the formation length of the fuel supply pipe (16) may be the same as the thickness of the outer peripheral wall (11) or the upper wall (14).
10 フューエルデリバリ本体
11 外周壁
12 インジェクターホルダー
13 ホルダー部
14 上壁
15 燃料導入口
16 燃料供給管
17 燃料導入口
18 開口部
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USRE43864E1 (en) | 2007-04-02 | 2012-12-18 | Hitachi, Ltd. | Method and apparatus for attenuating fuel pump noise in a direct injection internal combustion chamber |
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WO2011019150A3 (en) * | 2009-08-11 | 2011-05-26 | 주식회사 케피코 | Mounting structure for a direct injection fuel rail |
US8944031B2 (en) | 2009-08-11 | 2015-02-03 | Kefico Corporation | Mounting structure for a direct injection fuel rail |
JP2011052554A (en) * | 2009-08-31 | 2011-03-17 | Aisin Seiki Co Ltd | Fuel delivery pipe |
JP2012241568A (en) * | 2011-05-17 | 2012-12-10 | Otics Corp | Fuel delivery pipe and method for manufacturing fuel delivery pipe |
JP2012251462A (en) * | 2011-06-01 | 2012-12-20 | Otics Corp | Fuel delivery pipe and method of manufacturing the same |
WO2020158076A1 (en) * | 2019-01-31 | 2020-08-06 | 臼井国際産業株式会社 | Gasoline direct-injection rail |
JP2020122438A (en) * | 2019-01-31 | 2020-08-13 | 臼井国際産業株式会社 | Gasoline direct injection rail |
JP7465628B2 (en) | 2019-01-31 | 2024-04-11 | 臼井国際産業株式会社 | Gasoline direct injection rail |
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