JP4332877B2

JP4332877B2 - Sealing method for common rail

Info

Publication number: JP4332877B2
Application number: JP2004085395A
Authority: JP
Inventors: 菊雄浅田
Original assignee: Usui Co Ltd
Current assignee: Usui Co Ltd
Priority date: 2004-03-23
Filing date: 2004-03-23
Publication date: 2009-09-16
Anticipated expiration: 2024-03-23
Also published as: JP2005273496A

Description

本発明は、一般にディーゼル内燃機関における高圧燃料多岐管あるいはブロック・レール等のようなコモンレールの耐圧検査や内面洗浄を行う時のシール方法に関する。 The present invention generally relates to a sealing method for performing pressure resistance inspection and cleaning of an inner surface of a common rail such as a high pressure fuel manifold or a block rail in a diesel internal combustion engine.

従来、この種のコモンレールとしては、例えば図６に示すように、円形パイプからなる本管レール４１側の軸方向の周壁部に間隔を置いて設けた複数個のボス部４１−４に、本管レール４１の流通路４１−１に通じ、かつ外方に開口する受圧座面４１−３を有する分岐孔４１−２を穿設し、枝管や分岐継手金具等の分岐接続体４２側の接続頭部４２−２のなす押圧座面４２−３を本管レール４１側の受圧座面４１−３に当接係合せしめ、予め分岐接続体４２側に組込んだ締付け用外ねじナット（または袋ナット）４３を前記ボス部４１−４に螺合することにより前記接続頭部４２−２首下での押圧に伴って締着して接続構成する方式のものや、図７に示すように、断面円形の本管レール５１側の周壁部に設けた内部の流通路５１−１に通ずる断面円形の分岐孔５１−２部を外方に開口する受圧座面５１−３となし、該受圧座面附近の本管レール５１の外周部を囲繞する環状の継手金具５３の使用により、端部に先細円錐状の挫屈成形による拡径した分岐接続体５２側の接続頭部５２−２のなす押圧座面５２−３を当接係合せしめ、該継手金具５３に突設した螺子壁５３−１部と予め分岐接続体５２側に組込んだナット５４の螺合による前記接続頭部５２−２首下での押圧に伴って締着して接続した方式のもの、図８に示すように、内部に流通路６１−１を有する断面矩形のブロックからなる本管レール６１側の軸方向の周壁部に間隔を置いて設けた複数個の接続孔部６１−４の底部に、本管レール６１の流通路６１−１に通じ、かつ外方に開口する受圧座面（シート面）６１−３を有する分岐孔６１−２を穿設し、分岐接続体６２側の接続頭部６２−２のなす押圧座面６２−３を本管レール６１側の受圧座面６１−３に当接係合せしめ、予め分岐接続体６２側に組込んだ締付け用外ねじナット（または袋ナット）６３を前記接続孔部６１−４に螺合することにより前記接続頭部４２−２首下での押圧に伴って締着して接続構成する方式となしたブロック・レール型コモンレール等が知られている（特許文献１参照）。図中、４２−１、５２−１、６２−１はそれぞれ分岐接続体４２、５２、６２の流路である。
特開２００１−２８０２１７号 Conventionally, as this type of common rail, for example, as shown in FIG. 6, a plurality of boss portions 41-4 provided at intervals on an axial peripheral wall portion on the side of the main rail 41 made of a circular pipe are used. A branch hole 41-2 having a pressure-receiving seat surface 41-3 that communicates with the flow passage 41-1 of the pipe rail 41 and opens outward is drilled, and the branch connection body 42 side such as a branch pipe or a branch joint fitting is provided. The pressing seat surface 42-3 formed by the connection head 42-2 is brought into contact with and engaged with the pressure receiving seat surface 41-3 on the main rail 41 side, and the tightening external screw nut (incorporated on the branch connection body 42 side in advance) Or a nut having a connection configuration by screwing a cap nut (43) into the boss 41-4 to be connected with pressing under the neck of the connection head 42-2, as shown in FIG. To the internal flow passage 51-1 provided in the peripheral wall portion on the main rail 51 side having a circular cross section. By using the annular joint fitting 53 surrounding the outer periphery of the main rail 51 in the vicinity of the pressure-receiving seat surface, the surface-circular branch hole 51-2 is formed as a pressure-receiving seat surface 51-3 that opens outward. A screw wall projecting from the joint fitting 53 is formed by abutting and engaging the pressing seat surface 52-3 formed by the connection head portion 52-2 on the side of the branch connection body 52 expanded in diameter by the tapered conical buckling. FIG. 8 shows a system in which the connection head 52-2 is fastened and connected by pressing under the neck of the connection head 52-2 by screwing a nut 54 which is preliminarily incorporated in the branch connection body 52 side with the 53-1 part. As described above, at the bottom of a plurality of connection hole portions 61-4 provided at intervals in the axial peripheral wall portion on the main rail 61 side, which is a block having a rectangular cross section having a flow passage 61-1 inside, A pressure receiving seat surface (sheet surface) 61-3 that communicates with the flow passage 61-1 of the pipe rail 61 and opens outward is provided. A branch hole 61-2 is formed, and the pressing seat surface 62-3 formed by the connection head 62-2 on the branch connector 62 side is brought into contact with and engaged with the pressure receiving seat surface 61-3 on the main rail 61 side. When the external screw nut (or cap nut) 63 for tightening which has been assembled in advance on the side of the branch connection body 62 is screwed into the connection hole 61-4, the connection head 42-2 is pressed under the neck. A block rail type common rail and the like that are connected to each other by fastening are known (see Patent Document 1). In the figure, reference numerals 42-1, 52-1, and 62-1 denote flow paths of the branch connectors 42, 52, and 62, respectively.
JP 2001-280217 A

上記した接続構造のコモンレールを含めてこの種のコモンレールの耐圧検査や内面洗浄は、図６、図７、図８に示すように本管レール４１、５１、６１に分岐接続体４２、５２、６２を接続した状態で行われるのが一般的である。ところが、本管レール４１、５１、６１に分岐接続体４２、５２、６２を接続した状態で当該コモンレールの耐圧検査や内面洗浄を行う方式では、分岐接続体の接続構造が分岐接続体４２、５２、６２側の接続頭部４２−２、５２−２、６２−２に設けた押圧座面（シート面）４２−３、５２−３、６２−３と本管レール４１、５１、６１側に設けた受圧座面（シート面）４１−３、５１−３、６１−３でのシール方式となっているため、分岐接続体４２、５２、６２側に組込んだナット４３、５４、６３の螺合による前記接続頭部４２−２、５２−２、６２−２首下での押圧に伴い本管レール側のシート面が圧縮されることにより、ナットの締付け力が過大の場合には当該シート面が塑性変形することがあり、この塑性変形は内燃機関に後工程で取付ける際に正常な機能を著しく阻害し、また正常な機能を発揮させることができないという問題がある。 Withstand pressure inspection and inner surface cleaning of this type of common rail including the common rail having the above-described connection structure are performed by connecting the main rails 41, 51, 61 to the branch connectors 42, 52, 62 as shown in FIGS. Generally, it is performed in a state in which is connected. However, in a system in which the common rails 41, 51, 61 are connected to the branch connecting bodies 42, 52, 62 and the common rail is subjected to pressure resistance inspection and inner surface cleaning, the connecting structure of the branch connecting bodies is the branch connecting bodies 42, 52. , 62 side connecting heads 42-2, 52-2, 62-2, pressing seat surfaces (sheet surfaces) 42-3, 52-3, 62-3 and main rails 41, 51, 61 side Since the pressure receiving seat surface (sheet surface) 41-3, 51-3, 61-3 provided is a sealing method, the nuts 43, 54, 63 incorporated on the branch connection bodies 42, 52, 62 side When the tightening force of the nut is excessive due to the compression of the seat surface on the main rail side with the press under the neck of the connection heads 42-2, 52-2, 62-2 by screwing The seat surface may be plastically deformed. Significantly inhibit normal function when mounting in extent, also it is not possible to exhibit the normal function.

本発明は、上記した問題を解決するためになされたもので、シート面の塑性変形を防止し、分岐接続体接続部のシールの安定性を確保するために、本来のシート面を使用せずにシールしてコモンレールの耐圧検査や内面洗浄を行うことができるコモンレールのシール方法を提案しようとするものである。 The present invention has been made in order to solve the above-described problems. In order to prevent the plastic deformation of the seat surface and to ensure the stability of the seal of the branch connector connecting portion, the original seat surface is not used. It is intended to propose a common rail sealing method that can be sealed to perform common rail pressure resistance inspection and inner surface cleaning.

上記目的を達成するため本発明は、軸芯内部に流通路を有する本管レールの軸方向の周壁部に間隔を保持して複数の分岐孔を設け、かつ該分岐孔の周面部にそれぞれ前記流通路に通ずる流路を有する分岐接続体を連設する外方へ開口する受圧座面を形成して該分岐接続体の端部に設けた接続頭部のなす押圧座面を当接係合せしめ、本管レールと一体または別体の継手部分と予め分岐接続体側に組込んだナットの螺合による前記接続頭部での押圧に伴って締着して接続してなるコモンレールの耐圧検査または内面洗浄時のシール方法であって、前記押圧座面が前記受圧座面に当接しない接続頭部を有するシール用配管の当該接続頭部に前記分岐孔を囲むように形成した環状突起を該分岐孔の開口部周面に形成した前記耐圧検査用または内面洗浄用の平坦面に圧接させることにより、耐圧検査時または内面洗浄時に前記受圧座面を未使用の状態にするコモンレールのシール方法と、
軸芯内部に流通路を有する本管レールの軸方向の周壁部に間隔を保持して設けた複数個のボス部に、前記流通路に通じかつ外方へ開口する受圧座面を形成して該分岐接続体の端部に設けた接続頭部のなす押圧座面を当接係合せしめ、前記ボス部と予め分岐接続体側に組込んだナットの螺合による前記接続頭部での押圧に伴って締着して接続してなるコモンレールの耐圧検査または内面洗浄時のシール方法であって、前記ボス部に螺合するナット形のシール用キャップの内面に、前記ボス部に設けられた受圧座面を囲むように形成した環状突起を該受圧座面の開口部周面に形成した前記耐圧検査用または内面洗浄用の平坦面に圧接させることにより、耐圧検査時または内面洗浄時に前記受圧座面を未使用の状態にするコモンレールのシール方法と、
軸芯内部に流通路を有する本管レールの軸方向の周壁部に間隔を保持して設けた複数個のボス部に、前記流通路に通じかつ外方へ開口する受圧座面を形成して該分岐接続体の端部に設けた接続頭部のなす押圧座面を当接係合せしめ、前記ボス部と予め分岐接続体側に組込んだナットの螺合による前記接続頭部での押圧に伴って締着して接続してなるコモンレールの耐圧検査または内面洗浄時のシール方法であって、前記ボス部に螺合するナット形のシール用キャップに、前記ボス部に設けられた受圧座面を囲むように形成した環状突起を有するガスケットを内嵌し、前記ガスケットの環状突起を前記受圧座面の開口部周面に形成した前記耐圧検査用または内面洗浄用の平坦面に圧接させることにより、耐圧検査時または内面洗浄時に前記受圧座面を未使用の状態にするコモンレールのシール方法と、軸芯内部に流通路を有する本管レールの軸方向の周壁部に間隔を保持して複数の分岐孔を設け、かつ該分岐孔の周面部にそれぞれ前記流通路に通ずる流路を有する分岐接続体を連設する外方へ開口する受圧座面を形成して該分岐接続体の端部に設けた接続頭部のなす押圧座面を当接係合せしめ、本管レールと別体の継手部分と予め分岐接続体側に組込んだナットの螺合による前記接続頭部での押圧に伴って締着して接続してなるコモンレールの耐圧検査または内面洗浄時のシール方法であって、前記継手部分に螺合するシール用ニップルに、前記分岐孔部を囲むように形成した環状突起を設け、該環状突起を前記分岐孔の開口部周面に形成した前記耐圧検査用または内面洗浄用の平坦面に圧接させることにより、耐圧検査時または内面洗浄時に前記受圧座面を未使用の状態にするコモンレールのシール方法と、
内部に流通路を有するブロック・レール型本管レールの軸方向の周壁部に間隔を保持して設けた複数の接続孔部の底部に、前記流通路に通じかつ外方へ開口する受圧座面を有する分岐孔を設け、分岐接続体側の接続頭部のなす押圧座面を前記受圧座面に当接係合せしめ、予め分岐接続体側に組込んだナットを前記接続孔部に螺合することによる前記接続頭部での押圧に伴って締着して接続してなるブロック・レール型コモンレールの耐圧検査または内面洗浄時のシール方法であって、前記接続孔部に螺合するシール用ニップルに、前記分岐孔部を囲むように形成した環状突起を設け、該環状突起を前記分岐孔の開口部周面に形成した前記耐圧検査用または内面洗浄用の平坦面に圧接させることにより、耐圧検査時または内面洗浄時に前記受圧座面を未使用の状態にするコモンレールのシール方法、
を要旨とするものである。 In order to achieve the above object, the present invention provides a plurality of branch holes in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core, with a plurality of branch holes provided, and each of the peripheral surface portions of the branch holes. Forming a pressure receiving seating surface that opens outwardly connecting the branch connecting body having a flow path that communicates with the flow path, and abuts and engages the pressing seat surface formed by the connection head provided at the end of the branch connecting body Caulking, a common rail pressure test or a joint portion that is integrated with or separated from the main rail and that is fastened together with the pressing at the connection head by screwing a nut that is assembled in advance on the branch connection side. A sealing method for cleaning an inner surface, wherein an annular protrusion formed so as to surround the branch hole in the connection head of a sealing pipe having a connection head where the pressing seat surface does not contact the pressure-receiving seat surface For pressure resistance inspection or inner surface cleaning formed on the peripheral surface of the opening of the branch hole By pressing on the flat surface of the sealing method of the common rail to the unused state the pressure receiving seat surface when the withstand voltage test at or inner surface washing,
A pressure-receiving seating surface that communicates with the flow passage and opens outward is formed on a plurality of boss portions provided at intervals in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core. The pressing seat surface formed by the connection head provided at the end of the branch connection body is brought into contact with and engaged with the pressing at the connection head by screwing of the boss portion and the nut previously assembled on the branch connection body side. A common rail pressure-resistant inspection or inner surface cleaning method that is fastened and connected together, and a pressure receiving pressure provided on the boss portion on the inner surface of a nut-shaped sealing cap that is screwed to the boss portion. An annular projection formed so as to surround the seating surface is brought into pressure contact with the flat surface for pressure resistance inspection or inner surface cleaning formed on the peripheral surface of the opening of the pressure receiving seat surface , thereby allowing the pressure receiving seat to be used during pressure resistance inspection or inner surface cleaning. sealing method of the common rail to the state of the unused surface ,
A pressure-receiving seating surface that communicates with the flow passage and opens outward is formed on a plurality of boss portions provided at intervals in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core. The pressing seat surface formed by the connection head provided at the end of the branch connection body is brought into contact with and engaged with the pressing at the connection head by screwing of the boss portion and the nut previously assembled on the branch connection body side. A pressure-sensitive seating surface provided on the boss portion on a nut-type sealing cap that is screwed into the boss portion, and a method for sealing a common rail formed by tightening and connecting to the pressure-resistant inspection or cleaning the inner surface. A gasket having an annular protrusion formed so as to surround the inner surface is fitted, and the annular protrusion of the gasket is brought into pressure contact with the flat surface for pressure resistance inspection or inner surface cleaning formed on the peripheral surface of the opening of the pressure receiving seat surface. the pressure at the time of withstand voltage test at or inner surface washing And sealing method of the common rail to the state of the unused surface, a plurality of branch holes to hold the spacing in the peripheral wall portion in the axial direction of the main rail having a flow passage in the shaft inside provided, and periphery of the branch hole A pressure seating surface formed by a connecting head provided at an end of the branch connector is formed by forming a pressure receiving seat surface that opens outwardly connecting the branch connector having a flow path that communicates with the flow passage on the surface portion. The pressure resistance of the common rail, which is brought into contact with the main rail and is fastened together with the joint head part that is separate from the main rail and screwed together with the nut that is pre-installed on the branch connector side, and pressed together with the pressure at the connecting head. A sealing method for inspection or inner surface cleaning, wherein a sealing nipple screwed into the joint portion is provided with an annular protrusion formed so as to surround the branch hole, and the annular protrusion is provided around the opening of the branch hole. Flatness for pressure resistance inspection or inner surface cleaning formed on the surface By pressing on the sealing method of the common rail to the unused state the pressure receiving seat surface when the withstand voltage test at or inner surface washing,
A pressure-receiving seat surface that opens to the outside of the plurality of connection holes provided at intervals in the axial peripheral wall portion of the block rail type main rail having a flow passage therein and that opens to the outside. A pressure bearing surface formed by a connection head on the side of the branch connection body is brought into contact with and engaged with the pressure receiving seat surface, and a nut incorporated in advance on the side of the branch connection body is screwed into the connection hole portion. A block / rail type common rail pressure-resistant inspection or inner surface cleaning seal method that is connected by being pressed with the connection head by the above-described method, wherein the seal nipple is screwed into the connection hole. , the branch hole is provided to form the annular projection surrounding the, by pressing the annular projection on the flat surface of the withstand voltage test or the inner surface cleaning are formed in the opening peripheral surface of the branch hole, withstand voltage test Pressure when Sealing method of the common rail to the state of the unused surface,
Is a summary.

本発明に係るコモンレールのシール方法は、受圧座面と押圧座面とで構成される本来のシート面を使用せずにシールする方式を採用したことによって、本来のシート面が未使用の状態で耐圧検査や内面洗浄を行うことが可能となり、前記シート面の塑性変形等が皆無となることにより、内燃機関使用時における分岐接続体接続部のシールの安定性、信頼性を確保できるという優れた効果を奏する。 The common rail sealing method according to the present invention employs a method of sealing without using the original seat surface composed of the pressure-receiving seat surface and the pressing seat surface, so that the original seat surface is unused. It is possible to perform pressure-resistant inspection and inner surface cleaning, and because there is no plastic deformation of the seat surface, it is possible to secure the stability and reliability of the seal of the connecting part of the branch connection body when using the internal combustion engine There is an effect.

図１〜図５は本発明に係るコモンレールのシール方法を例示したもので、図１〜図３は一体型ボス部を有するコモンレールのシール手段を示す縦断面図、図４は環状の継手金具（別体形）を有するコモンレールのシール手段を示す縦断面図図５はブロック・レール型コモンレールのシール手段を示す縦断面図であり、１、１１、２１、３１は本管レール、２は洗浄用、耐圧用等のシール用配管、３は締付け用ナット、４は環状継手金具、１２ａ、１２ｂはシール用キャップ、２２、３２はシール用ニップルである。 1 to 5 exemplify a common rail sealing method according to the present invention. FIGS. 1 to 3 are longitudinal sectional views showing a common rail sealing means having an integral boss portion, and FIG. FIG. 5 is a longitudinal sectional view showing the sealing means of the block rail type common rail. 1, 11, 21, 31 are main rails, 2 are for cleaning, Sealing pipes for pressure resistance and the like, 3 is a tightening nut, 4 is an annular joint fitting, 12a and 12b are sealing caps, and 22 and 32 are sealing nipples.

すなわち、図１に示す一体型ボス部を有するコモンレールのシール方法は、円形パイプからなる本管レール１側の軸方向の周壁部に間隔を置いて設けた複数個の一体型ボス部１−５に、本管レール１の流通路１−１に通じ、かつ外方に開口する受圧座面（シート面）１−３および該受圧座面の凹部の平坦面１−４を有する分岐孔１−２を穿設し、図６に示すものと同様の分岐接続体（図示せず）の端部に設けた接続頭部のなす押圧座面を前記受圧座面１−３に当接係合せしめ、前記一体型ボス部１−５と予め分岐接続体側に組込んだ締付け用ナット３の螺合による前記接続頭部での押圧に伴って締着して接続する方式となしたコモンレールにおいて、流路２−１を有するシール用配管２の先端部に設ける前記本管レール１側の受圧座面（シート面）１−３に当接しない大きさの接続頭部２−２のなす前記本管レール１側の平坦面１−４との対向面に該本管レールの流通路１−１を囲むように環状突起２−３を形成し、前記接続頭部２−２の側面部が本管レール１側の受圧座面（シート面）１−３に当接しないように前記環状突起２−３を前記平坦面１−４に当接させた状態で、予め噴射管２側に組込んだ締付け用ナット（袋ナット）３を前記ボス部１−５に螺合することにより前記接続頭部２−２首下での押圧に伴って環状突起２−３を平坦面１−４に圧接させてシールする方式である。 That is, the common rail sealing method having an integrated boss portion shown in FIG. 1 has a plurality of integrated boss portions 1-5 provided at intervals on an axial peripheral wall portion on the main rail 1 side made of a circular pipe. In addition, a branch hole 1- having a pressure receiving seat surface (seat surface) 1-3 that communicates with the flow passage 1-1 of the main rail 1 and that opens outward, and a flat surface 1-4 of the concave portion of the pressure receiving seat surface. 2 is formed, and a pressure seat surface formed by a connection head provided at an end of a branch connection body (not shown) similar to that shown in FIG. 6 is brought into contact with and engaged with the pressure receiving seat surface 1-3. In the common rail which is fastened and connected with the pressing at the connecting head by screwing the integrated boss portion 1-5 and the fastening nut 3 previously assembled on the branch connector side, The pressure-receiving seat surface (sea sheet) on the main rail 1 side provided at the tip of the sealing pipe 2 having the path 2-1. Surface) The flow path 1-1 of the main rail is surrounded by a surface facing the flat surface 1-4 on the main rail 1 side formed by the connecting head 2-2 having a size that does not abut against the main surface 1-3. An annular protrusion 2-3 is formed on the connecting head 2-2 so that the side surface of the connecting head 2-2 does not contact the pressure receiving seat surface (seat surface) 1-3 on the main rail 1 side. The connection head 2- is screwed into the boss 1-5 by screwing a tightening nut (cap nut) 3 previously assembled on the injection pipe 2 side in a state of being in contact with the flat surface 1-4. This is a system in which the annular projection 2-3 is pressed against the flat surface 1-4 in accordance with the pressing under the two necks and sealed.

次に、図２に示す一体型ボス部を有するコモンレールのシール方法は、本管レール１１の軸方向の周壁部に間隔を置いて設けた複数個の一体型ボス部１１−４に、本管レール１１の流通路１１−１に通じ、かつ外方に開口する受圧座面（シート面）１１−３を有する分岐孔１１−２を穿設し、図６に示すものと同様の分岐接続体（図示せず）の端部に設けた接続頭部のなす押圧座面を前記受圧座面１１−３に当接係合せしめ、前記一体型ボス部１１−４と予め分岐接続体側に組込んだ締付け用ナットの螺合による前記接続頭部での押圧に伴って締着して接続する方式となしたコモンレールにおいて、前記ボス部に螺合するナット形のシール用キャップ１２ａの内面に、前記一体型ボス部１１−４に設けられた受圧座面１１−３を囲むように形成した環状突起１２ａ−１を該受圧座面１１−３の開口端面に圧接させてシールする方式である。 Next, a method for sealing a common rail having an integrated boss portion shown in FIG. 2 is applied to a plurality of integrated boss portions 11-4 provided at intervals in the axial peripheral wall portion of the main rail 11. A branched connecting body similar to that shown in FIG. 6 is provided with a branching hole 11-2 that communicates with the flow passage 11-1 of the rail 11 and has a pressure receiving seat surface (sheet surface) 11-3 that opens outward. The pressing seat surface formed by the connection head provided at the end of the (not shown) is brought into contact with and engaged with the pressure receiving seat surface 11-3, and is integrated with the integrated boss portion 11-4 in advance on the branch connector side. In the common rail that is fastened and connected in accordance with the pressure at the connection head by screwing of the tightening nut, the inner surface of the nut-shaped sealing cap 12a that is screwed to the boss portion Shaped so as to surround the pressure-receiving seat surface 11-3 provided on the integrated boss portion 11-4 The annular projection 12a-1 that is by pressure contact with the opening end face of the receiving 圧座 surface 11-3 is a method of sealing.

また、図３に示す一体型ボス部を有するコモンレールのシール方法は、図２に示すものと同じコモンレールにおいて、前記一体型ボス部１１−４に螺合するナット形のシール用キャップ１２ｂに、前記ボス部に設けられた受圧座面１１−３を囲むように形成した環状突起１３−１を有するガスケット１３を内嵌し、前記ガスケット１３の環状突起１３−１を前記受圧座面１１−３の開口端面に圧接させてシールする方式である。 Further, the sealing method of the common rail having the integrated boss portion shown in FIG. 3 is the same as that shown in FIG. 2 in the nut-shaped sealing cap 12b screwed to the integrated boss portion 11-4. A gasket 13 having an annular protrusion 13-1 formed so as to surround the pressure receiving seat surface 11-3 provided in the boss portion is fitted inside, and the annular protrusion 13-1 of the gasket 13 is inserted into the pressure receiving seat surface 11-3. This is a method of sealing by pressing against the opening end face.

図４に示すコモンレールのシール方法は、円形パイプからなる本管レール２１側の周壁部に、内部の流通路２１−１に通じかつ外方に開口する受圧座面（シート面）２１−３および該受圧座面の凹部の平坦面２１−４を有する分岐孔２１−２を穿設し、前記受圧座面付近の本管レール２１の外周部を囲繞する環状継手金具４の使用により、前記図７に示すものと同様の分岐接続体（図示せず）の接続頭部のなす押圧座面を前記受圧座面２１−３に当接係合せしめ、該環状継手金具４に突設した螺子壁部４−１と予め分岐接続体側に組込んだナットの螺合による前記接続頭部首下での押圧に伴って締着して接続する方式となしたコモンレールにおいて、前記螺子壁部４−１に螺合するナット形のシール用ニップル２２の先端部に前記本管レール２１側の受圧座面（シート面）２１−３に当接しない大きさの頭部２２−１を設けるとともに、該頭部２２−１の前記本管レール２１側の平坦面２１−４との対向面に２１−２を囲むように環状突起２２−２を形成し、前記頭部２２−１の側面部が本管レール２１側の受圧座面（シート面）２１−３に当接しないように前記環状突起２２−２を前記平坦面２１−４に当接させた状態で、当該シール用ニップル２２を締め付けることにより環状突起２２−２を平坦面２１−４に圧接させてシールする方式である。 The common rail sealing method shown in FIG. 4 includes a pressure-receiving seat surface (seat surface) 21-3 that opens to the outside on the peripheral wall portion on the main rail 21 side made of a circular pipe and communicates with the internal flow passage 21-1. By using the annular joint fitting 4 which is provided with a branch hole 21-2 having a flat surface 21-4 of the concave portion of the pressure receiving seat surface and surrounds the outer peripheral portion of the main rail 21 near the pressure receiving seat surface, FIG. 7 is a screw wall projecting from the annular joint fitting 4 with a pressure seat surface formed by a connection head of a branch connection body (not shown) similar to that shown in FIG. In the common rail that is fastened and connected with the press under the neck of the connection head by screwing the nut 4-1 and the nut assembled in advance on the branch connection body side, the screw wall portion 4-1 The main rail is attached to the tip of a nut-shaped sealing nipple 22 that is screwed onto the main rail. A head 22-1 having a size that does not contact the pressure-receiving seat surface (seat surface) 21-3 on the one side is provided, and the flat surface 21-4 on the main rail 21 side of the head 22-1 is provided. An annular protrusion 22-2 is formed on the opposing surface so as to surround 21-2 so that the side surface portion of the head 22-1 does not come into contact with the pressure receiving seat surface (seat surface) 21-3 on the main rail 21 side. With the annular protrusion 22-2 in contact with the flat surface 21-4, the sealing nipple 22 is tightened to bring the annular protrusion 22-2 into pressure contact with the flat surface 21-4 for sealing. is there.

図５に示すブロック・レール型コモンレールのシール方法は、前記図４に示すものと同様のナット形のシール用ニップル３２を用いてシールする方式であり、前記図８に示すものと同様、内部に流通路３１−１を有する断面矩形のブロックからなる本管レール３１側の軸方向の周壁部に間隔を置いて設けた複数個の接続孔部３１−４の底部に、本管レール３１の流通路３１−１に通じ、かつ外方に開口する受圧座面（シート面）３１−３および平坦面３１−５を有する分岐孔３１−２を穿設し、前記図８に示すものと同様の分岐接続体（図示せず）の接続頭部のなす押圧座面を前記受圧座面３１−３に当接係合せしめ、接続孔部３１−４と予め分岐接続体側に組込んだナットの螺合による前記接続頭部首下での押圧に伴って締着して接続する方式となしたブロック・レール型コモンレールにおいて、前記接続孔部３１−４に螺合するシール用ニップル３２の先端部に前記本管レール３１側の受圧座面（シート面）３１−３に当接しない大きさの頭部３２−１を設けるとともに、該頭部３２−１の前記本管レール３１側の平坦面３１−５との対向面に３１−２を囲むように環状突起３２−２を形成し、前記頭部３２−１の側面部が本管レール３１側の受圧座面（シート面）３１−３に当接しないように前記環状突起３２−２を前記平坦面３１−５に当接させた状態で、当該シール用ニップル３２を締め付けることにより環状突起３２−２を平坦面３１−５に圧接させてシールする方式である。 The block-rail type common rail sealing method shown in FIG. 5 is a method of sealing using a nut-shaped sealing nipple 32 similar to that shown in FIG. 4, and in the same manner as shown in FIG. Distribution of the main rail 31 at the bottom of a plurality of connecting hole portions 31-4 provided at intervals on the axial peripheral wall portion on the main rail 31 side, which is a block having a rectangular cross section having the flow passage 31-1. A branch hole 31-2 having a pressure receiving seat surface (sheet surface) 31-3 and a flat surface 31-5 that opens to the outside and communicates with the passage 31-1 is formed, and is similar to that shown in FIG. The pressing seat surface formed by the connection head of the branch connection body (not shown) is brought into contact with and engaged with the pressure receiving seat surface 31-3, and the screw of the nut previously assembled to the connection hole portion 31-4 and the branch connection body side. Fasten and connect as the connection head presses under the neck In the block rail type common rail, the pressure receiving seat surface (sheet surface) 31-3 on the main rail 31 side is brought into contact with the tip of the sealing nipple 32 screwed into the connection hole 31-4. An annular protrusion 32-2 is provided so as to surround 31-2 on the surface of the head 32-1 facing the flat surface 31-5 on the main rail 31 side. The annular protrusion 32-2 is abutted against the flat surface 31-5 so that the side surface portion of the head portion 32-1 does not contact the pressure receiving seat surface (sheet surface) 31-3 on the main rail 31 side. In this state, the sealing nipple 32 is tightened to bring the annular protrusion 32-2 into pressure contact with the flat surface 31-5 for sealing.

前記実施例におけるコモンレールとしての本管レール１、１１は、例えば直径２８ｍｍ、肉厚９ｍｍの、比較的厚肉の管状部を有するような材質Ｓ４５Ｃ、ＳＣＭ４３５、ＳＮＣＭ４３９等の多くは鍛造品であって、ボーリング、ガンドリルなどの機械加工によってその軸芯内部を流通路となして、軸方向の周壁部に間隔を保持して複数個の一体型ボス部または別体型ボス部、ブロック・レール型の場合は接続孔部がそれぞれ設けられている。 The main rails 1 and 11 as common rails in the above-described embodiment are mostly forged products such as materials S45C, SCM435 and SNCM439 having a relatively thick tubular portion having a diameter of 28 mm and a thickness of 9 mm. In the case of multiple integrated bosses or separate bosses, block rail type, with the inside of the shaft serving as a flow path by machining such as boring, gun drill, etc., and keeping a space in the axial peripheral wall Each has a connection hole.

本発明に係るコモンレールのシール方法は、ディーゼル内燃機関以外の高圧配管の耐圧検査や内面洗浄にも適用可能である。 The method for sealing a common rail according to the present invention is applicable to pressure resistance inspection and inner surface cleaning of high pressure pipes other than diesel internal combustion engines.

本発明の一体型ボス部を有するコモンレールのシール手段の一実施例を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Example of the sealing means of the common rail which has an integral boss | hub part of this invention. 同じく一体型ボス部を有するコモンレールのシール手段の他の実施例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other Example of the sealing means of a common rail which similarly has an integral boss | hub part. 同じく一体型ボス部を有するコモンレールのシール手段の別の実施例を示す縦断面図である。It is a longitudinal cross-sectional view which shows another Example of the sealing means of a common rail which similarly has an integrated boss | hub part. 本発明の別体型ボス部（環状の継手金具）を有するコモンレールのシール手段一実施例を示すを示す縦断面図The longitudinal cross-sectional view which shows one Example of the sealing means of the common rail which has the separate type | mold boss | hub part (annular joint metal fitting) of this invention 本発明のブロック・レール型コモンレールのシール手段の一実施例を示す縦断面図である。It is a longitudinal cross-sectional view which shows one Example of the sealing means of the block rail type common rail of this invention. 本発明の対象とする一体型ボス部を有するコモンレールの一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the common rail which has the integrated boss | hub part made into the object of this invention. 同じく別体型ボス部を有するコモンレールの一例を示す縦断面図である。It is a longitudinal section showing an example of a common rail which similarly has a separate boss part. 同じくブロック・レール型コモンレールの一例を示す縦断面図である。It is a longitudinal section showing an example of a block rail type common rail similarly.

Explanation of symbols

１、１１、２１、３１本管レール
１−１、１１−１、２１−１、３１−１流通路
１−２、１１−２、２１−２、３１−２分岐孔
１−３、１１−３、２１−３、３１−３受圧座面
１−４、２１−４、３１−５耐圧検査用または内面洗浄用の平坦面
１−５、１１−４ボス部
２分岐接続体
２−１流路
２−２、２２−１、３２−１頭部
２−３、１２ａ−１、１３−１、２２−２、３２−２環状突起
３締付け用ナット
１２ａ、１２ｂシール用キャップ
２２、３２シール用ニップル
４環状継手金具
４−１螺子壁
１３ガスケット
３１−４接続孔部 1, 11, 21, 31 Main rail 1-1, 11-1, 21-1, 31-1 Flow path 1-2, 11-2, 21-2, 31-2 Branch hole 1-3, 11- 3, 21-3, 31-3 Pressure bearing surface
1-4, 21-4, 31-5 Flat surface for pressure resistance inspection or inner surface cleaning
1-5 , 11-4 Boss part 2 Branch connection body 2-1 Flow path 2-2, 22-1, 32-1 Head 2-3, 12a-1, 13-1, 22-2, 32-2 Annular projection 3 Tightening nuts 12a and 12b Seal caps 22 and 32 Sealing nipple 4 Annular fitting 4-1 Screw wall 13 Gasket 31-4 Connection hole

Claims

A branch connection having a plurality of branch holes provided at intervals in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core, and a flow passage communicating with the flow passage on the peripheral surface portion of the branch hole. A pressure-receiving seat surface that opens outwardly connecting the body is formed, and the pressing seat surface formed by the connection head provided at the end of the branch connection body is brought into contact with and engaged with the main rail, either integrally or separately. A joint rail and a sealing method at the time of pressure-resistant inspection or inner surface cleaning of the common rail that is connected by being tightened and connected with the press at the connection head by screwing a nut assembled on the branch connector side in advance, An annular protrusion formed so as to surround the branch hole on the connection head of the sealing pipe having a connection head where the pressing seat surface does not contact the pressure-receiving seat surface is formed on the peripheral surface of the opening of the branch hole. By pressing against the flat surface for pressure resistance inspection or inner surface cleaning Sealing method of the common rail, characterized in that the unused state of the pressure receiving seat surface when the withstand voltage test at or inside surface cleaning.

A pressure-receiving seating surface that communicates with the flow passage and opens outward is formed on a plurality of boss portions provided at intervals in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core. The pressing seat surface formed by the connection head provided at the end of the branch connection body is brought into contact with and engaged with the pressing at the connection head by screwing of the boss portion and the nut previously assembled on the branch connection body side. A common rail pressure-resistant inspection or inner surface cleaning method that is fastened and connected together, and a pressure receiving pressure provided on the boss portion on the inner surface of a nut-shaped sealing cap that is screwed to the boss portion. An annular protrusion formed so as to surround the seating surface is brought into pressure contact with the flat surface for pressure resistance inspection or inner surface cleaning formed on the peripheral surface of the opening of the pressure receiving seat surface , so that the pressure receiving seat is used during pressure resistance inspection or inner surface cleaning. Komonre, characterized in that a state of non-use surface Sealing method Le.

A pressure-receiving seating surface that communicates with the flow passage and opens outward is formed on a plurality of boss portions provided at intervals in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core. The pressing seat surface formed by the connection head provided at the end of the branch connection body is brought into contact with and engaged with the pressing at the connection head by screwing of the boss portion and the nut previously assembled on the branch connection body side. A pressure-sensitive seating surface provided on the boss portion on a nut-type sealing cap that is screwed into the boss portion, and a method for sealing a common rail formed by tightening and connecting to the pressure-resistant inspection or cleaning the inner surface. A gasket having an annular protrusion formed so as to surround the inner surface is fitted, and the annular protrusion of the gasket is brought into pressure contact with the flat surface for pressure resistance inspection or inner surface cleaning formed on the peripheral surface of the opening of the pressure receiving seat surface. the pressure at the time of withstand voltage test at or inner surface washing Sealing method of the common rail, characterized in that the unused state of the surface.

A branch connection having a plurality of branch holes provided at intervals in the axial peripheral wall portion of the main rail having a flow passage inside the shaft core, and a flow passage communicating with the flow passage on the peripheral surface portion of the branch hole. A pressure-receiving seating surface that opens outwardly connecting the body is formed, and the pressing seating surface formed by the connection head provided at the end of the branch connection body is brought into contact engagement with the main rail and a separate joint A common rail pressure-resistant inspection or inner surface cleaning method, wherein the joint is fastened together with pressing at the connecting head by screwing of a nut that is pre-assembled into the branch connecting body side, An annular protrusion formed so as to surround the branch hole is provided in a sealing nipple that is screwed into the portion, and the annular protrusion is formed on the peripheral surface of the opening of the branch hole. by pressing on the surface, at the time of or inside surface washed withstand voltage test Sealing method of the common rail, characterized in that the unused state of the pressure receiving seat surface.

A pressure-receiving seat surface that opens to the outside of the plurality of connection holes provided at intervals in the axial peripheral wall portion of the block rail type main rail having a flow passage therein and that opens to the outside. A pressure bearing surface formed by a connection head on the side of the branch connection body is brought into contact with and engaged with the pressure receiving seat surface, and a nut incorporated in advance on the side of the branch connection body is screwed into the connection hole portion. A block / rail type common rail pressure-resistant inspection or inner surface cleaning seal method that is connected by being pressed with the connection head by the above-described method, wherein the seal nipple is screwed into the connection hole. , the branch hole is provided to form the annular projection surrounding the, by pressing the annular projection on the flat surface of the withstand voltage test or the inner surface cleaning are formed in the opening peripheral surface of the branch hole, withstand voltage test Pressure when Sealing method of the common rail, characterized in that the unused state of the surface.