JP7465628B2 - Gasoline direct injection rail - Google Patents

Gasoline direct injection rail Download PDF

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JP7465628B2
JP7465628B2 JP2019015072A JP2019015072A JP7465628B2 JP 7465628 B2 JP7465628 B2 JP 7465628B2 JP 2019015072 A JP2019015072 A JP 2019015072A JP 2019015072 A JP2019015072 A JP 2019015072A JP 7465628 B2 JP7465628 B2 JP 7465628B2
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rail body
rail
connecting member
hole
direct injection
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JP2020122438A (en
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洋行 西澤
秀司 鈴木
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Usui Co Ltd
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Usui Co Ltd
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Priority to JP2019015072A priority Critical patent/JP7465628B2/en
Priority to PCT/JP2019/041854 priority patent/WO2020158076A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

本発明は、レール本体と接続部材とを備えたガソリン直噴レールに関するものである。 The present invention relates to a gasoline direct injection rail that has a rail body and a connecting member.

従来より、特許文献１や図５～７に示す如く、円筒状のレール本体(31)の壁面(35)にこのレール本体(31)の内部と外部とを連通する貫通孔(32)を複数個所に貫通形成したガソリン直噴レールが既に知られている。そしてこの貫通孔(32)の形成位置には、インジェクターホルダー等の接続部材(33)がろう付け固定されるとともに、レール本体(31)の内部と接続部材(33)とが貫通孔(32)を通じて連通した状態となっている。
特開2010-7651号公報 Conventionally, as shown in Patent Document 1 and Figures 5 to 7, a gasoline direct injection rail has been known in which through holes (32) that communicate between the inside and outside of a cylindrical rail body (31) are formed in a wall surface (35) of the rail body (31) at a plurality of locations. A connecting member (33) such as an injector holder is brazed and fixed to the formed positions of the through holes (32), and the inside of the rail body (31) and the connecting member (33) are in communication with each other through the through holes (32).
JP 2010-7651 A

しかしながら、上記の如く貫通孔(32)を設けたレール本体(31)を高圧のガソリン直噴システムに使用した場合には、この貫通孔(32)に応力が集中するものとなり、レール本体(31)の破損の原因となっていた。このような応力集中を回避するためには、接続部材(33)に、貫通孔(32)に挿通可能な筒部(図示せず。)を突出形成し、この筒部を貫通孔(32)に挿通した状態でレール本体(31)を接続部材(33)に組み付ける構成が考えられる。 However, when the rail body (31) having the through hole (32) as described above is used in a high-pressure gasoline direct injection system, stress is concentrated in the through hole (32), which causes damage to the rail body (31). In order to avoid such stress concentration, a cylindrical portion (not shown) that can be inserted into the through hole (32) is formed on the connection member (33) and the rail body (31) is assembled to the connection member (33) with the cylindrical portion inserted into the through hole (32).

しかしながら、従来のレール本体(31)は、特許文献１及び図５、６に示す如く筒状の形をしていることから、このレール本体(31)に組み付ける接続部材(33)のレール本体(31)との接続面を、上記レール本体(31)に面接触させるために引用文献１や図７に示す如く湾曲状に凹んだ湾曲面(34)としなければならない。しかしながら、このような湾曲面(34)に貫通孔(32)に挿通するための筒部を形成することは技術的に難しいため、接続部材(33)に筒部を形成し、この筒部を貫通孔(32)に挿通配置して貫通孔(32)への応力集中を防ぐという方法は困難なものであった。 However, since the conventional rail body (31) has a cylindrical shape as shown in Patent Document 1 and Figures 5 and 6, the connection surface of the connecting member (33) to be assembled to the rail body (31) must be a curved surface (34) that is concave in a curved shape as shown in Patent Document 1 and Figure 7 in order to make surface contact with the rail body (31). However, since it is technically difficult to form a cylindrical portion on such a curved surface (34) for insertion into the through hole (32), it was difficult to form a cylindrical portion on the connecting member (33) and insert this cylindrical portion into the through hole (32) to prevent stress concentration on the through hole (32).

そこで、本発明は上記の如き課題を解決しようとするものであって、レール本体及び接続部材の形状を、このレール本体の貫通孔に上記接続部材の筒部を挿通可能な形状として貫通孔への応力集中を防ぎ、耐圧性向上を図ろうとするものである。 The present invention aims to solve the above problems by changing the shape of the rail body and the connecting member so that the cylindrical portion of the connecting member can be inserted into the through hole of the rail body, thereby preventing stress concentration in the through hole and improving pressure resistance.

本願発明は上述の如き課題を解決したものであって、外周断面形状を四角形、内周断面形状を円形とするとともに、外周面及び内周面を貫通する貫通孔を複数個所に貫通形成したレール本体と、このレール本体の外周面に面接触可能な平坦面を設け、この平坦面に、上記レール本体の貫通孔に挿入可能な筒部を突設するとともに当該筒部よりも肉厚に形成した筒型の接続部材とを備え、この接続部材の平坦面をレール本体の外周面に面接触させるとともに上記筒部をレール本体の貫通孔に貫通させて、この筒部の先端をこのレール本体の内周面から突出させた状態で、上記レール本体と接続部材とを面接触させた状態で組み付けて成り、高圧のガソリン直噴システムに使用されるものである。

 The present invention has solved the above-mentioned problems, and comprises a rail main body having an outer circumferential cross-sectional shape that is rectangular and an inner circumferential cross-sectional shape that is circular, and having multiple through holes formed through the outer circumferential surface and the inner circumferential surface; and a cylindrical connecting member having a flat surface that can be in surface contact with the outer circumferential surface of the rail main body, a tubular portion that can be inserted into the through hole of the rail main body protruding from the flat surface and is formed to be thicker than the tubular portion , the flat surface of the connecting member being in surface contact with the outer circumferential surface of the rail main body and the tubular portion penetrating the through hole of the rail main body, with the tip of the tubular portion protruding from the inner circumferential surface of the rail main body, and the rail main body and the connecting member being assembled in a surface contact state , and is used in a high-pressure gasoline direct injection system.

上記の如く、レール本体の外周断面形状を四角形とすることにより、このレール本体に組み付ける接続部材のレール本体への接触面を平坦面とすることが可能となり、この平坦面に筒部を突出形成することが技術的に容易となる。従って、この接続部材の筒部をレール本体の貫通孔に貫通配置してレール本体に接続部材を組み付けることが可能となるため、これにより貫通孔への高圧システムによる応力の集中化を防いでレール本体の破損を防止可能とすることができる。 As described above, by making the outer circumferential cross-sectional shape of the rail body rectangular, it is possible to make the contact surface of the connecting member to be attached to the rail body a flat surface, and it is technically easy to form a protruding cylindrical portion on this flat surface. Therefore, it is possible to assemble the connecting member to the rail body by placing the cylindrical portion of the connecting member through the through hole of the rail body, which prevents the concentration of stress due to the high-pressure system in the through hole and prevents damage to the rail body.

またレール本体は引き抜き加工を行った後、あるいは引き抜き加工を行わずに切削加工にて形成し、更に内周面に切削加工を施したものである。また、引き抜き加工のみで成形したものであっても良い。 The rail body is formed by cutting after drawing or without drawing, and then the inner circumferential surface is cut. It may also be formed by drawing only.

また、レール本体は、外周面も表面切削加工を施したものであってもよい。このように外周面にも表面切削加工を施すことによって、レール本体断面の外周形状を容易に四角形に形成することができる。 The outer periphery of the rail body may also be surface-machined. By performing surface machining on the outer periphery in this way, the outer periphery of the cross section of the rail body can be easily formed into a square shape.

本願発明は上記の如くレール本体の外周断面形状を四角形とすることにより、このレール本体に組み付ける接続部材のレール本体への接触面を平坦面とすることができる。そのため、接続部材に平坦面を形成するとともにこの平坦面に筒部を突出形成することができるものとなる。従って、この接続部材の筒部をレール本体の貫通孔に貫通配置することにより、貫通孔への高圧システムによる応力の集中化を防ぐことができる。 As described above, the present invention makes it possible to make the outer circumferential cross-sectional shape of the rail body a square, so that the contact surface of the connecting member that is attached to the rail body can be a flat surface. This allows the connecting member to have a flat surface and a cylindrical portion that protrudes from this flat surface. Therefore, by arranging the cylindrical portion of the connecting member through the through hole of the rail body, it is possible to prevent the concentration of stress due to the high-pressure system in the through hole.

またレール本体の外周断面形状を四角形、内周断面形状を円形とすることにより、従来の外周及び内周断面形状が円形であるレール本体と比較して、構造上の強度を向上させることができる。そのため、レール本体への内圧付加時にレール本体の壁面が変形するのを抑制することが可能となる。よって、レール本体の変形を防ぐためのブラケットの剛性を過度に上げる必要がなく簡素化できるため、製造コストを低く抑えることができる。 In addition, by making the outer circumferential cross-sectional shape of the rail body square and the inner circumferential cross-sectional shape circular, the structural strength can be improved compared to conventional rail bodies with circular outer and inner circumferential cross-sectional shapes. This makes it possible to suppress deformation of the wall surface of the rail body when internal pressure is applied to the rail body. This means that there is no need to excessively increase the rigidity of the bracket to prevent deformation of the rail body and it can be simplified, which helps keep manufacturing costs low.

本発明の実施例１を示す断面図。1 is a cross-sectional view showing a first embodiment of the present invention. 実施例１に示すレール本体の断面図。FIG. 2 is a cross-sectional view of the rail body shown in the first embodiment. 実施例１に示す接続部材の斜視図。FIG. 2 is a perspective view of a connection member shown in the first embodiment. 図１の部分拡大断面図。FIG. 2 is a partially enlarged cross-sectional view of FIG. 従来例を示す断面図。FIG. 図５の部分拡大断面図。FIG. 6 is a partially enlarged cross-sectional view of FIG. 5 . 従来例の接続部材を示す斜視図。FIG. 13 is a perspective view showing a connecting member of a conventional example.

本発明の実施例１について、図１～４において以下に説明する。まず、図１に示す如く(1)はレール本体であって、長尺な管状に形成するともに、図２に示す如く外周断面形状を四角形、内周断面形状を円形としている。このように外周断面形状を四角形、内周断面形状を円形とすることにより、従来の外周及び内周断面形状が円形の場合と比較して、構造上の強度が向上するものとなる。そのため、内圧付加時に発生するレール本体(1)の変形の抑制効果を更に高める事ができる。 A first embodiment of the present invention will be described below with reference to Figures 1 to 4. First, as shown in Figure 1, (1) is a rail body formed into a long tube, and as shown in Figure 2, the outer circumferential cross-sectional shape is rectangular and the inner circumferential cross-sectional shape is circular. By making the outer circumferential cross-sectional shape rectangular and the inner circumferential cross-sectional shape circular in this way, the structural strength is improved compared to conventional cases where the outer and inner circumferential cross-sectional shapes are circular. This makes it possible to further increase the effect of suppressing deformation of the rail body (1) that occurs when internal pressure is applied.

また図１、４に示す如く、このレール本体(1)の壁面(4)には、このレール本体(1)の内周面(3)と外周面(2)とを連通する貫通孔(5)を３ヶ所設けている。また、このレール本体(1)の両端にはエンドキャップ(6)を設けている。 As shown in Figures 1 and 4, the wall surface (4) of the rail body (1) has three through holes (5) that connect the inner peripheral surface (3) and the outer peripheral surface (2) of the rail body (1). In addition, end caps (6) are provided on both ends of the rail body (1).

またこのレール本体(1)は、全切削加工にて形成したものであって、内周面(3)及び外周面(2)にも切削加工が施されている。 The rail body (1) is entirely formed by cutting, with the inner circumferential surface (3) and outer circumferential surface (2) also being cut.

尚、本実施例ではレール本体(1)を全切削加工にて形成しているが、他の異なる実施例ではこれに限らず、引き抜き加工を行った後、内周面及び外周面、又は内周面のみに最終工程として切削加工を施したものであっても良いし、引き抜き加工のみで成形したものであっても良い。 In this embodiment, the rail body (1) is formed entirely by cutting, but in other embodiments, this is not limited to the above, and after drawing, cutting may be performed on the inner and outer surfaces, or only on the inner surface, as a final process, or the rail body may be formed only by drawing.

また上記の如く形成した貫通孔(5)には、図３に示す如き接続部材(8)を組み付けている。この接続部材(8)は、一端に平坦面(10)を形成した略筒型であって、この平坦面(10)
の中央部から筒部(11)を突設している。 A connecting member 8 as shown in Fig. 3 is attached to the through hole 5 formed as described above. The connecting member 8 is substantially cylindrical with a flat surface 10 formed on one end.
A cylindrical portion (11) protrudes from the center of the

そして図４に示す如く、上記の如く形成した接続部材(8)の筒部(11)を、レール本体(1)の貫通孔(5)に挿通配置するとともに、このレール本体(1)と接続部材(8)とをろう付けすることにより両者が組み付けられるものとなる。この時、上記の如くレール本体(1)の外周断面形状を四角形としていることから、このレール本体(1)に面接触させて組み付ける接続部材(8)の上面を平坦面(10)とし、この平坦面(10)に、上記レール本体(1)に設けた貫通孔(5)に貫通可能な筒部(11)を容易に突出形成することができる。 As shown in Figure 4, the tubular portion (11) of the connecting member (8) formed as described above is inserted into the through hole (5) of the rail body (1), and the rail body (1) and the connecting member (8) are brazed to each other to assemble them. At this time, since the outer circumferential cross-sectional shape of the rail body (1) is rectangular as described above, the upper surface of the connecting member (8) that is assembled in surface contact with the rail body (1) is made into a flat surface (10), and the tubular portion (11) that can pass through the through hole (5) provided in the rail body (1) can be easily formed to protrude from this flat surface (10).

また、図３に示す筒部(11)の突出高さtを、この筒部(11)をレール本体(1)の貫通孔(5)に組み付けた際に、筒部(11)の先端がレール本体(1)の内周面から突出する高さとしている。そのため、上記レール本体(1)に接続部材(8)を組み付けた際には、図４に示す如く筒部(11)がレール本体(1)の内周面(3)よりも内方に突出した状態で配置されるものとなる。 The protruding height t of the tubular portion (11) shown in FIG. 3 is the height at which the tip of the tubular portion (11) protrudes from the inner peripheral surface of the rail body (1) when the tubular portion (11) is assembled into the through hole (5) of the rail body (1). Therefore, when the connecting member (8) is assembled to the rail body (1), the tubular portion (11) is positioned in a state where it protrudes inward from the inner peripheral surface (3) of the rail body (1) as shown in FIG. 4.

ここで、上記の如く形成した本実施例のガソリン直噴レールと、本実施例のレール本体(1)と同じ内径のレール本体(31)にて構成した、図５～７に示す従来のガソリン直噴レールとを用いて、内圧を付加した場合の応力発生状況についてのＣＡＥ解析を行い、内圧をかけた際の各レール本体(1)(31)の貫通孔(5)(32)付近に発生する応力について、シミュレーション解析を行った。 Here, we conducted a CAE analysis of the stress generation state when internal pressure was applied using the gasoline direct injection rail of this embodiment formed as described above and the conventional gasoline direct injection rail shown in Figures 5 to 7, which is composed of a rail body (31) with the same inner diameter as the rail body (1) of this embodiment, and performed a simulation analysis of the stress generated near the through holes (5) and (32) of each rail body (1) and (31) when internal pressure was applied.

この解析により、本実施例のガソリン直噴レールを用いることにより、従来のガソリン直噴レールよりも貫通孔(5)付近に発生する応力を約１３％程度低減させることができることが明らかとなった。よってこの解析結果から、本実施例のガソリン直噴レールでは、貫通孔(5)への高圧システムによる応力集中化の低減を可能とすることが実証された。 This analysis revealed that by using the gasoline direct injection rail of this embodiment, it is possible to reduce the stress generated near the through hole (5) by approximately 13% compared to a conventional gasoline direct injection rail. Therefore, the results of this analysis demonstrate that the gasoline direct injection rail of this embodiment makes it possible to reduce the stress concentration caused by the high pressure system at the through hole (5).

１ レール本体
２ 外周面
３ 内周面
５ 貫通孔
８ 接続部材
１０ 平坦面
１１ 筒部 Reference Signs List 1 Rail body 2 Outer circumferential surface 3 Inner circumferential surface 5 Through hole 8 Connection member 10 Flat surface 11 Cylindrical portion

Claims (2)

外周断面形状を四角形、内周断面形状を円形とするとともに、外周面及び内周面を貫通する貫通孔を複数個所に貫通形成したレール本体と、このレール本体の外周面に面接触可能な平坦面を設け、この平坦面に、上記レール本体の貫通孔に挿入可能な筒部を突設するとともに当該筒部よりも肉厚に形成した筒型の接続部材とを備え、この接続部材の平坦面をレール本体の外周面に面接触させるとともに上記筒部をレール本体の貫通孔に貫通させて、この筒部の先端をこのレール本体の内周面から突出させた状態で、上記レール本体と接続部材とを面接触させた状態で組み付けて成り、高圧のガソリン直噴システムに使用されることを特徴とするガソリン直噴レール。 A gasoline direct injection rail comprising: a rail body having an outer circumferential cross-sectional shape of a square and an inner circumferential cross-sectional shape, and having a plurality of through holes formed therethrough that penetrate the outer circumferential surface and the inner circumferential surface; and a cylindrical connecting member having a flat surface capable of surface contact with the outer circumferential surface of the rail body, a tubular portion that can be inserted into the through hole of the rail body protruding from the flat surface and is formed to be thicker than the tubular portion , the flat surface of the connecting member being in surface contact with the outer circumferential surface of the rail body and the tubular portion being inserted into the through hole of the rail body, with the tip of the tubular portion protruding from the inner circumferential surface of the rail body, and the rail body and the connecting member being assembled in a surface contact state , characterized in that it is used in a high-pressure gasoline direct injection system. レール本体は、外周面も切削加工を施したことを特徴とする請求項１のガソリン直噴レール。 The gasoline direct injection rail of claim 1, characterized in that the outer periphery of the rail body is also machined.
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JP2005147075A (en) 2003-11-19 2005-06-09 Usui Kokusai Sangyo Kaisha Ltd Fuel delivery pipe
JP2011220262A (en) 2010-04-12 2011-11-04 Otics Corp Fuel delivery pipe
JP2012251462A (en) 2011-06-01 2012-12-20 Otics Corp Fuel delivery pipe and method of manufacturing the same
JP2013245561A (en) 2012-05-23 2013-12-09 Otics Corp Method of producing fuel distribution pipe

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