WO2011068202A1 - Gasket and structure for connecting same to exhaust pipe - Google Patents

Gasket and structure for connecting same to exhaust pipe Download PDF

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Publication number
WO2011068202A1
WO2011068202A1 PCT/JP2010/071691 JP2010071691W WO2011068202A1 WO 2011068202 A1 WO2011068202 A1 WO 2011068202A1 JP 2010071691 W JP2010071691 W JP 2010071691W WO 2011068202 A1 WO2011068202 A1 WO 2011068202A1
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WIPO (PCT)
Prior art keywords
gasket
periphery
bead
opening
reducing agent
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PCT/JP2010/071691
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French (fr)
Japanese (ja)
Inventor
功 大原
信之 平木
達夫 益子
Original Assignee
いすゞ自動車株式会社
日野自動車株式会社
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Application filed by いすゞ自動車株式会社, 日野自動車株式会社 filed Critical いすゞ自動車株式会社
Priority to CN201080048466.9A priority Critical patent/CN102648342B/en
Publication of WO2011068202A1 publication Critical patent/WO2011068202A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F01N13/1827—Sealings specially adapted for exhaust systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24—Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]

Definitions

  • the present invention relates to a gasket and exhaust pipe connection structure, and more particularly to a technique for preventing corrosion of bolts that tighten flanges of pipe joints.
  • a selective reduction catalyst (SCR) device has been developed as one of exhaust gas purification devices in order to purify NOx in exhaust gas of an engine, for example, a diesel engine (see, for example, Patent Documents 1 and 2).
  • This SCR device supplies, for example, urea water, which is a liquid reducing agent, upstream of the exhaust gas of the SCR device, hydrolyzes urea with the heat of the exhaust gas to generate ammonia, and this ammonia reduces NOx on the SCR catalyst. To purify it.
  • urea water which is a liquid reducing agent
  • connection portion such as a supply pipe of the urea water supply device or the SCR device and the exhaust pipe
  • a gasket is provided between the flanges 20 and 21 constituting the pipe joint as shown in FIG. 5 in order to ensure the sealing performance of the connection portion.
  • a structure in which the flanges 20 and 21 are fastened with bolts 27 and nuts 28 with 22B interposed therebetween is employed.
  • Reference numeral 29 denotes a washer.
  • a plurality of holes 30 for inserting bolts are formed in the flanges 20 and 21 at appropriate intervals in the circumferential direction.
  • the gasket 22B includes an opening 23 formed in the center for exhaust gas passage, a plurality of holes 24 formed in the periphery for bolt insertion, and a periphery of the opening 23 for substantial sealing. It has an annular main bead (projection) portion 25 formed to protrude in the vicinity.
  • connection portion if urea water leaks from the main bead portion 25 of the gasket 22B, the urea water may adhere to the bolts 27. If urea water adheres to the bolt 27 and the bolt 27 corrodes and breaks, the connection between the flanges 20 and 21 cannot be maintained, and a serious problem may occur.
  • the present invention has been made in consideration of the above circumstances, and even if the liquid reducing agent leaks from the main bead portion of the gasket, the liquid reducing agent can be prevented from being applied to the bolt, and corrosion by the liquid reducing agent can be prevented. It is an object of the present invention to provide a gasket and exhaust pipe connection structure that can prevent the deterioration and breakage of bolts caused by the above.
  • a gasket according to the present invention has an opening for exhaust gas and a plurality of holes for inserting bolts on the periphery, and is formed to protrude from the periphery of the opening. It has an annular main bead portion and an annular sub-bead portion formed to protrude from the peripheral portion of the hole portion.
  • the raised height of the sub-bead portion is lower than the raised height of the main bead portion.
  • the main bead and the secondary bead are formed so that the back side is recessed and the front side is raised by beading.
  • the gasket according to the present invention has a plurality of holes for inserting bolts at the periphery of the opening for exhaust gas, an annular main bead raised at the periphery of the opening, and the periphery of the hole It is characterized in that it is formed by integrally joining a pair of gasket constituent pieces formed by forming annular sub-beads raised at the portions back to back.
  • the exhaust pipe connection structure according to the present invention is provided by connecting a liquid reducing agent supply pipe section and a selective reduction catalyst device in the middle of an exhaust pipe of a diesel engine by a pipe joint, and selecting the liquid reducing agent supply pipe section. Any one of the gaskets is interposed between both flanges of a pipe joint connecting the reduction catalyst device.
  • the sub-bead portion can prevent the liquid reducing agent from being applied to the bolt, and the deterioration of the bolt due to corrosion by the liquid reducing agent. And breakage can be prevented.
  • FIGS. 3A and 3B are views showing a gasket used in the exhaust gas purification device connecting portion of FIG. 2, wherein FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view taken along line BB in FIG. It is sectional drawing of a gasket structural piece. It is sectional drawing which shows the structure of the conventional exhaust-gas purification apparatus connection part.
  • reference numeral 1 denotes an engine such as a diesel engine.
  • An exhaust pipe 3 is connected to an exhaust manifold 2 of the engine 1.
  • An NOx reduction SCR device (also referred to as an SCR unit) 4 which is one of exhaust gas purification devices, is connected to the exhaust pipe 3 in the middle of the exhaust pipe 3, and liquid reduction is performed upstream of the SCR device 4.
  • a urea water supply pipe part (liquid reducing agent supply pipe part) 8 provided with an injection nozzle 7 for supplying urea water 5 as an agent to the SCR catalyst 6 of the SCR device 4 is connected.
  • the exhaust pipe 3 is divided into a front portion 3a and a rear portion 3b.
  • a urea water storage tank 10 is connected to the injection nozzle 7 of the urea water supply pipe section 8 via a urea water supply pipe 9.
  • the urea water storage tank 10 is configured to pump the urea water 5 to the injection nozzle 7 through the urea water supply pipe 9.
  • the SCR device 4 is mainly composed of an SCR catalyst 6 and a cylindrical container 11 containing the SCR catalyst 6.
  • a funnel-shaped exhaust gas inlet member 12 and an exhaust gas outlet member 13 are detachably connected to the front end portion and the rear end portion of the container 11 via first and second pipe joints 14 and 15, respectively.
  • a rear portion 3 b of the exhaust pipe 3 is connected to the exhaust gas outlet member 13 via a third pipe joint 16.
  • the urea water supply pipe portion 8 is detachably connected to the exhaust gas inlet member 12 via a fourth pipe joint 17, and the urea water supply pipe portion 8 is connected to the front portion 3 a of the exhaust pipe 3. Are detachably connected via the fifth pipe joint 18.
  • a connecting portion of the SCR device 4 for example, a fourth pipe joint upstream of the SCR catalyst 6 of the SCR device 4 and downstream of the urea water injection nozzle 7.
  • a gasket 22A according to an embodiment of the present invention is used.
  • the gasket 22 ⁇ / b> A has an opening 23 for exhaust gas at the center and a plurality of holes 24 for inserting bolts at the periphery, and at the periphery of the opening 23. It has an annular main bead portion 25 formed so as to be raised, and an annular sub-bead portion 26 formed so as to be raised on the peripheral portion of the hole portion 24.
  • the diameter of the opening 23 is set larger than the diameter of the hole 24.
  • gasket 22A a pair (two) of gasket constituent pieces 22p made of a material having heat resistance and corrosion resistance as shown in FIG. In addition, they are integrally joined by spot welding.
  • the main bead portion 25 and the sub bead portion 26 of the gasket component piece 22p are formed so as to protrude from one surface of the gasket component piece 22p so that the back surface side is depressed and the front surface side is raised by beading processing which is a kind of sheet metal processing. Yes.
  • the opening 23 and the hole 24 are formed by punching.
  • the gasket 22A in the illustrated example is formed in a planar triangle, it may be formed in a plurality of polygons, polygons, or circles.
  • the raised height ha of the sub bead portion 26 is formed lower than the raised height hb of the main bead portion 25, In other words, the raised height hb of the main bead portion 25 is preferably formed higher than the raised height ha of the auxiliary bead 26.
  • the gasket 22 ⁇ / b> A is interposed between the flanges 20 and 21 constituting the fourth pipe joint 17, and is clamped between the flanges 20 and 21 by tightening the flanges 20 and 21 with bolts 27 and nuts 28.
  • Reference numeral 29 denotes a washer.
  • a plurality of holes 30 for inserting bolts are formed in the flanges 20 and 21 at appropriate intervals in the circumferential direction.
  • the exposed portion of the bolt 27 exposed between the flanges 20 and 21 is sealed by the sub bead portion 26. Even if ammonia leaks, the urea water or ammonia can be prevented from being applied (contacted) to the bolt 27, and the deterioration or breakage of the bolt 27 due to the corrosion by the urea water or ammonia can be prevented, thereby improving the durability. I can plan.
  • gasket of the present embodiment is also applied to the gasket in the first pipe joint 14.
  • gasket of this embodiment may be applied to all the pipe joints.

Abstract

Provided are a gasket and a structure for connecting same to an exhaust pipe, which can, even if a liquid reducing agent leaks from a main bead of the gasket, prevent the liquid reducing agent from spilling on bolts and thus prevent deterioration and breakage of the bolts due to corrosion caused by the liquid reducing agent. The disclosed gasket has: an opening (23) for exhaust gas; a plurality of holes (24) provided in the periphery of the gasket through each of which a bolt is passed; an annular main bead (25) formed in a protruding manner around the periphery of the opening (23); and annular auxiliary beads (26) each formed in a protruding manner around the periphery of one of the holes (24).

Description

ガスケット及び排気管の接続構造Gasket and exhaust pipe connection structure
　本発明は、ガスケット及び排気管の接続構造に係り、特に管継手のフランジ同士を締め付けるボルトの腐食を防止する技術に関するものである。 The present invention relates to a gasket and exhaust pipe connection structure, and more particularly to a technique for preventing corrosion of bolts that tighten flanges of pipe joints.
　エンジン、例えばディーゼルエンジンの排気ガス中のＮＯｘを浄化するために排気ガス浄化装置の一つとして、例えば選択還元触媒（ＳＣＲ）装置が開発されている（例えば、特許文献１，２参照）。このＳＣＲ装置は、液体還元剤である例えば尿素水をＳＣＲ装置の排気ガス上流に供給し、排気ガスの熱で尿素を加水分解してアンモニアを生成し、このアンモニアによってＳＣＲ触媒上でＮＯｘを還元して浄化するものである。 For example, a selective reduction catalyst (SCR) device has been developed as one of exhaust gas purification devices in order to purify NOx in exhaust gas of an engine, for example, a diesel engine (see, for example, Patent Documents 1 and 2). This SCR device supplies, for example, urea water, which is a liquid reducing agent, upstream of the exhaust gas of the SCR device, hydrolyzes urea with the heat of the exhaust gas to generate ammonia, and this ammonia reduces NOx on the SCR catalyst. To purify it.
　尿素水供給装置の供給配管やＳＣＲ装置と排気管などの各接続部においては、その接続部のシール性を確保するために図５に示すように管継手を構成するフランジ２０，２１間にガスケット２２Ｂを介在させてフランジ２０，２１同士をボルト２７とナット２８で締め付ける構造が採用されている。なお、２９はワッシャである。フランジ２０，２１には周方向に適宜間隔でボルト挿通用の複数の孔部３０が形成されている。 In each connection portion such as a supply pipe of the urea water supply device or the SCR device and the exhaust pipe, a gasket is provided between the flanges 20 and 21 constituting the pipe joint as shown in FIG. 5 in order to ensure the sealing performance of the connection portion. A structure in which the flanges 20 and 21 are fastened with bolts 27 and nuts 28 with 22B interposed therebetween is employed. Reference numeral 29 denotes a washer. A plurality of holes 30 for inserting bolts are formed in the flanges 20 and 21 at appropriate intervals in the circumferential direction.
　前記ガスケット２２Ｂは、排気ガス通過用として中央部に形成された開口部２３と、ボルト挿通用として周縁部に形成された複数の孔部２４と、実質的なシール用として前記開口部２３の周縁近傍に隆起して形成された環状の主ビード（突起）部２５とを有している。 The gasket 22B includes an opening 23 formed in the center for exhaust gas passage, a plurality of holes 24 formed in the periphery for bolt insertion, and a periphery of the opening 23 for substantial sealing. It has an annular main bead (projection) portion 25 formed to protrude in the vicinity.
特開２０００－２７６２７号公報JP 2000-27627 A 特開２００５－８３２２３号公報JP 2005-83223 A
　しかしながら、前記接続部においては、仮にガスケット２２Ｂの主ビード部２５から尿素水が漏れた場合、その尿素水がボルト２７に付着する虞がある。ボルト２７に尿素水が付着することにより、ボルト２７が腐食して折損すると、フランジ２０，２１同士の接続を維持できなくなり、重大な不具合が発生する虞がある。 However, in the connection portion, if urea water leaks from the main bead portion 25 of the gasket 22B, the urea water may adhere to the bolts 27. If urea water adheres to the bolt 27 and the bolt 27 corrodes and breaks, the connection between the flanges 20 and 21 cannot be maintained, and a serious problem may occur.
　本発明は、前記事情を考慮してなされたものであり、仮にガスケットの主ビード部から液体還元剤が漏れたとしても、その液体還元剤がボルトにかかるのを防止でき、液体還元剤による腐食に起因するボルトの劣化や折損を防止できるガスケット及び排気管の接続構造を提供することを目的とする。 The present invention has been made in consideration of the above circumstances, and even if the liquid reducing agent leaks from the main bead portion of the gasket, the liquid reducing agent can be prevented from being applied to the bolt, and corrosion by the liquid reducing agent can be prevented. It is an object of the present invention to provide a gasket and exhaust pipe connection structure that can prevent the deterioration and breakage of bolts caused by the above.
　前記目的を達成するために、本発明に係るガスケットは、排気ガス用の開口部と、周縁のボルト挿通用の複数の孔部とを有すると共に、前記開口部の周縁部に隆起して形成された環状の主ビード部と、前記孔部の周縁部に隆起して形成された環状の副ビード部とを有することを特徴とする。 In order to achieve the above object, a gasket according to the present invention has an opening for exhaust gas and a plurality of holes for inserting bolts on the periphery, and is formed to protrude from the periphery of the opening. It has an annular main bead portion and an annular sub-bead portion formed to protrude from the peripheral portion of the hole portion.
　前記副ビード部の隆起高さが、前記主ビード部の隆起高さよりも低く形成されていることが好ましい。 It is preferable that the raised height of the sub-bead portion is lower than the raised height of the main bead portion.
　前記主ビード及び前記副ビードが、ビーディング加工により裏面側が窪み、表面側が隆起するように形成されていることが好ましい。 It is preferable that the main bead and the secondary bead are formed so that the back side is recessed and the front side is raised by beading.
　また、本発明に係るガスケットは、排気ガス用の開口部の周縁にボルト挿通用の複数の孔部を有すると共に、前記開口部の周縁部に隆起した環状の主ビードと、前記孔部の周縁部に隆起した環状の副ビードとを形成してなる一対のガスケット構成片を背中合わせにして一体に接合して形成されていることを特徴とする。 The gasket according to the present invention has a plurality of holes for inserting bolts at the periphery of the opening for exhaust gas, an annular main bead raised at the periphery of the opening, and the periphery of the hole It is characterized in that it is formed by integrally joining a pair of gasket constituent pieces formed by forming annular sub-beads raised at the portions back to back.
　更に、本発明に係る排気管の接続構造は、ディーゼルエンジンの排気管の途中に液体還元剤供給管部及び選択還元触媒装置を管継手により接続して設け、その液体還元剤供給管部と選択還元触媒装置を接続する管継手の両フランジ間に前記何れかのガスケットが介設されていることを特徴とする。 Furthermore, the exhaust pipe connection structure according to the present invention is provided by connecting a liquid reducing agent supply pipe section and a selective reduction catalyst device in the middle of an exhaust pipe of a diesel engine by a pipe joint, and selecting the liquid reducing agent supply pipe section. Any one of the gaskets is interposed between both flanges of a pipe joint connecting the reduction catalyst device.
　本発明によれば、仮にガスケットの主ビード部から液体還元剤が漏れたとしても、その液体還元剤がボルトにかかるのを副ビード部によって防止でき、液体還元剤による腐食に起因するボルトの劣化や折損を防止できる。 According to the present invention, even if the liquid reducing agent leaks from the main bead portion of the gasket, the sub-bead portion can prevent the liquid reducing agent from being applied to the bolt, and the deterioration of the bolt due to corrosion by the liquid reducing agent. And breakage can be prevented.
本発明に係るガスケットが使用される排気ガス浄化装置の一例を概念的に示す図である。It is a figure which shows notionally an example of the exhaust gas purification apparatus in which the gasket which concerns on this invention is used. 図１のＡ部である排気ガス浄化装置接続部の構成を示す拡大断面図である。It is an expanded sectional view which shows the structure of the exhaust-gas purification apparatus connection part which is the A section of FIG. 図２の排気ガス浄化装置接続部に用いられているガスケットを示す図で、（ａ）は平面図、（ｂ）は（ａ）のＢ－Ｂ線断面図である。FIGS. 3A and 3B are views showing a gasket used in the exhaust gas purification device connecting portion of FIG. 2, wherein FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view taken along line BB in FIG. ガスケット構成片の断面図である。It is sectional drawing of a gasket structural piece. 従来の排気ガス浄化装置接続部の構成を示す断面図である。It is sectional drawing which shows the structure of the conventional exhaust-gas purification apparatus connection part.
　以下に、本発明を実施するための形態を添付図面に基いて詳述する。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
　図１において、１は例えばディーゼルエンジン等のエンジンであり、このエンジン１の排気マニフォールド２には排気管３が接続されている。この排気管３の途中には排気ガス浄化装置の一つであるＮＯｘ還元用のＳＣＲ装置（ＳＣＲユニットともいう。）４が接続されていると共に、このＳＣＲ装置４の排気ガス上流には液体還元剤である尿素水５をＳＣＲ装置４のＳＣＲ触媒６に供給するための噴射ノズル７を備えた尿素水供給管部（液体還元剤供給管部）８が接続されている。これらＳＣＲ装置（選択還元触媒装置）４及び尿素水供給管部８を取付けるために、前記排気管３は前部３ａと後部３ｂに分割されている。 1, reference numeral 1 denotes an engine such as a diesel engine. An exhaust pipe 3 is connected to an exhaust manifold 2 of the engine 1. An NOx reduction SCR device (also referred to as an SCR unit) 4, which is one of exhaust gas purification devices, is connected to the exhaust pipe 3 in the middle of the exhaust pipe 3, and liquid reduction is performed upstream of the SCR device 4. A urea water supply pipe part (liquid reducing agent supply pipe part) 8 provided with an injection nozzle 7 for supplying urea water 5 as an agent to the SCR catalyst 6 of the SCR device 4 is connected. In order to attach the SCR device (selective reduction catalyst device) 4 and the urea water supply pipe portion 8, the exhaust pipe 3 is divided into a front portion 3a and a rear portion 3b.
　この尿素水供給管部８の噴射ノズル７には、尿素水供給パイプ９を介して尿素水貯蔵タンク１０が接続されている。この尿素水貯蔵タンク１０は、尿素水５を尿素水供給パイプ９を介して噴射ノズル７に圧送するように構成されている。 A urea water storage tank 10 is connected to the injection nozzle 7 of the urea water supply pipe section 8 via a urea water supply pipe 9. The urea water storage tank 10 is configured to pump the urea water 5 to the injection nozzle 7 through the urea water supply pipe 9.
　前記ＳＣＲ装置４は、ＳＣＲ触媒６と、このＳＣＲ触媒６を収容した円筒状の容器１１とから主に構成されている。前記容器１１の前端部と後端部には漏斗状の排気ガス入口部材１２と排気ガス出口部材１３がそれぞれ第１、第２の管継手１４，１５を介して着脱自在に接続されており、その排気ガス出口部材１３には前記排気管３の後部３ｂが第３の管継手１６を介して接続されている。 The SCR device 4 is mainly composed of an SCR catalyst 6 and a cylindrical container 11 containing the SCR catalyst 6. A funnel-shaped exhaust gas inlet member 12 and an exhaust gas outlet member 13 are detachably connected to the front end portion and the rear end portion of the container 11 via first and second pipe joints 14 and 15, respectively. A rear portion 3 b of the exhaust pipe 3 is connected to the exhaust gas outlet member 13 via a third pipe joint 16.
　前記排気ガス入口部材１２には前記尿素水供給管部８が第４の管継手１７を介して着脱自在に接続されており、この尿素水供給管部８には前記排気管３の前部３ａが第５の管継手１８を介して着脱自在に接続されている。 The urea water supply pipe portion 8 is detachably connected to the exhaust gas inlet member 12 via a fourth pipe joint 17, and the urea water supply pipe portion 8 is connected to the front portion 3 a of the exhaust pipe 3. Are detachably connected via the fifth pipe joint 18.
　そして、図１ないし図２に示すように、前記ＳＣＲ装置４の接続部、例えば、ＳＣＲ装置４のＳＣＲ触媒６よりも上流であって尿素水の噴射ノズル７よりも下流の第４の管継手１７における対向するフランジ部２０，２１間に介在されてボルト締めにより挟持されるガスケットとして、本発明の一実施形態であるガスケット２２Ａが用いられている。このガスケット２２Ａは、図２ないし図３に示すように、中央の排気ガス用の開口部２３と、周縁のボルト挿通用の複数の孔部２４とを有すると共に、前記開口部２３の周縁部に隆起して形成された環状の主ビード部２５と、前記孔部２４の周縁部に隆起して形成された環状の副ビード部２６とを有している。前記開口部２３の口径は、前記孔部２４の口径よりも大きく設定されている。 As shown in FIGS. 1 and 2, a connecting portion of the SCR device 4, for example, a fourth pipe joint upstream of the SCR catalyst 6 of the SCR device 4 and downstream of the urea water injection nozzle 7. As a gasket interposed between the opposing flange portions 20 and 21 in FIG. 17 and clamped by bolting, a gasket 22A according to an embodiment of the present invention is used. As shown in FIGS. 2 to 3, the gasket 22 </ b> A has an opening 23 for exhaust gas at the center and a plurality of holes 24 for inserting bolts at the periphery, and at the periphery of the opening 23. It has an annular main bead portion 25 formed so as to be raised, and an annular sub-bead portion 26 formed so as to be raised on the peripheral portion of the hole portion 24. The diameter of the opening 23 is set larger than the diameter of the hole 24.
　前記ガスケット２２Ａは、図４に示すような耐熱性及び耐食性を有する材料例えばステンレス板からなるガスケット構成片２２ｐを一対（２枚）用意し、両ガスケット構成片２２ｐ，２２ｐを平坦な背面同士を重ね合わせ、スポット溶接により一体に接合して形成されている。ガスケット構成片２２ｐの主ビード部２５及び副ビード部２６は、板金加工の一種であるビーディング加工により裏面側が窪み、表面側が隆起するようにガスケット構成片２２ｐの片側の面に突出して形成されている。前記開口部２３及び孔部２４は、打ち抜き加工により形成されている。なお、図示例のガスケット２２Ａは平面三角形に形成されているが、複数角形や多角形、円形に形成されていてもよい。 For the gasket 22A, a pair (two) of gasket constituent pieces 22p made of a material having heat resistance and corrosion resistance as shown in FIG. In addition, they are integrally joined by spot welding. The main bead portion 25 and the sub bead portion 26 of the gasket component piece 22p are formed so as to protrude from one surface of the gasket component piece 22p so that the back surface side is depressed and the front surface side is raised by beading processing which is a kind of sheet metal processing. Yes. The opening 23 and the hole 24 are formed by punching. Although the gasket 22A in the illustrated example is formed in a planar triangle, it may be formed in a plurality of polygons, polygons, or circles.
　本来のシール部である主ビード部２５によるシール性を確保するために、前記副ビード部２６の隆起高さｈａは、前記主ビード部２５の隆起高さｈｂよりも低く形成されていること、換言すれば、前記主ビード部２５の隆起高さｈｂは、前記副ビード２６の隆起高さｈａよりも高く形成されていることが好ましい。 In order to ensure the sealing performance by the main bead portion 25 which is the original seal portion, the raised height ha of the sub bead portion 26 is formed lower than the raised height hb of the main bead portion 25, In other words, the raised height hb of the main bead portion 25 is preferably formed higher than the raised height ha of the auxiliary bead 26.
　前記ガスケット２２Ａは、前記第４の管継手１７を構成するフランジ２０，２１間に介在され、フランジ２０，２１同士をボルト２７とナット２８で締め付けることによりフランジ２０，２１間に挟持された状態に取付けられる。なお、２９はワッシャである。フランジ２０，２１には周方向に適宜間隔でボルト挿通用の複数の孔部３０が形成されている。 The gasket 22 </ b> A is interposed between the flanges 20 and 21 constituting the fourth pipe joint 17, and is clamped between the flanges 20 and 21 by tightening the flanges 20 and 21 with bolts 27 and nuts 28. Mounted. Reference numeral 29 denotes a washer. A plurality of holes 30 for inserting bolts are formed in the flanges 20 and 21 at appropriate intervals in the circumferential direction.
　このように構成されたガスケット２２Ａによれば、フランジ２０，２１間に露出しているボルト２７の露出部分が副ビード部２６によってシールされるため、仮にガスケット２２の主ビード部２５から尿素水ないしアンモニアが漏れたとしても、その尿素水ないしアンモニアがボルト２７にかかる（接触する）のを防止でき、尿素水ないしアンモニアによる腐食に起因するボルト２７の劣化や折損を防止でき、耐久性の向上が図れる。 According to the gasket 22A configured in this manner, the exposed portion of the bolt 27 exposed between the flanges 20 and 21 is sealed by the sub bead portion 26. Even if ammonia leaks, the urea water or ammonia can be prevented from being applied (contacted) to the bolt 27, and the deterioration or breakage of the bolt 27 due to the corrosion by the urea water or ammonia can be prevented, thereby improving the durability. I can plan.
　第１の管継手１４におけるガスケットにも本実施形態のガスケットが適用されていることが好ましい。なお、全ての管継手に本実施形態のガスケットが適用さていてもよい。 It is preferable that the gasket of the present embodiment is also applied to the gasket in the first pipe joint 14. In addition, the gasket of this embodiment may be applied to all the pipe joints.
　以上、本発明の実施の形態を図面により詳述してきたが、本発明は前記実施の形態に限定されるものではなく、本発明の要旨を逸脱しない範囲での種々の設計変更が可能である。 The embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention. .
１　エンジン
８　液体還元剤供給管部
４　選択還元触媒装置
２２Ａ　ガスケット
２２ｐ　ガスケット構成片
２３　開口部
２４　孔部
２５　主ビード部
２６　副ビード部
ｈａ　副ビード部の隆起高さ
ｈｂ　主ビード部の隆起高さ DESCRIPTION OF SYMBOLS 1 Engine 8 Liquid reducing agent supply pipe part 4 Selective reduction catalyst apparatus 22A Gasket 22p Gasket component piece 23 Opening part 24 Hole part 25 Main bead part 26 Sub bead part ha Raised height of an auxiliary bead part hb Raised height of a main bead part

Claims (5)

  1. 　排気ガス用の開口部と、周縁のボルト挿通用の複数の孔部とを有すると共に、前記開口部の周縁部に隆起して形成された環状の主ビードと、前記孔部の周縁部に隆起して形成された環状の副ビードとを有することを特徴とするガスケット。 An annular main bead having an opening for exhaust gas and a plurality of holes for inserting bolts at the periphery, and protruding from the periphery of the opening, and protruding at the periphery of the hole A gasket having an annular secondary bead formed as described above.
  2. 　前記副ビードの隆起高さが、前記主ビードの隆起高さよりも低く形成されていることを特徴とする請求項１記載のガスケット。 2. The gasket according to claim 1, wherein the raised height of the secondary bead is lower than the raised height of the main bead.
  3. 　前記主ビード及び前記副ビードが、ビーディング加工により裏面側が窪み、表面側が隆起するように形成されていることを特徴とする請求項１又は２記載のガスケット。 The gasket according to claim 1 or 2, wherein the main bead and the sub bead are formed so that the back side is recessed and the front side is raised by beading.
  4. 　排気ガス用の開口部の周縁にボルト挿通用の複数の孔部を有すると共に、前記開口部の周縁部に隆起した環状の主ビードと、前記孔部の周縁部に隆起した環状の副ビードとを形成してなる一対のガスケット構成片を背中合わせにして一体に接合して形成されていることを特徴とするガスケット。 A plurality of holes for inserting bolts at the periphery of the opening for exhaust gas, an annular main bead raised at the periphery of the opening, and an annular sub-bead raised at the periphery of the hole; A gasket comprising: a pair of gasket constituent pieces formed by joining together and back to back.
  5. 　エンジンの排気管の途中に液体還元剤供給管部及び選択還元触媒装置を管継手により接続して設け、その液体還元剤供給管部と選択還元触媒装置を接続する管継手の両フランジ間に請求項１から４の何れかに記載のガスケットが介設されていることを特徴とする排気管の接続構造。 A liquid reducing agent supply pipe part and a selective reduction catalyst device are connected by a pipe joint in the middle of the exhaust pipe of the engine, and charged between both flanges of a pipe joint connecting the liquid reducing agent supply pipe part and the selective reduction catalyst device. Item 5. An exhaust pipe connection structure, wherein the gasket according to any one of Items 1 to 4 is interposed.
PCT/JP2010/071691 2009-12-04 2010-12-03 Gasket and structure for connecting same to exhaust pipe WO2011068202A1 (en)

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JP5911163B1 (en) * 2015-05-10 2016-04-27 有限会社 東進車輌工業 Metal gasket for exhaust pipe

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Publication number Priority date Publication date Assignee Title
DE102013016235A1 (en) * 2013-10-01 2015-04-02 Deutz Aktiengesellschaft Exhaust system for diesel vehicles
CN105156224A (en) * 2015-10-30 2015-12-16 重庆长安汽车股份有限公司 Exhaust manifold sealing gasket

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JPS62177363A (en) * 1986-01-30 1987-08-04 Yuusan Gasket Kk Gasket for exhaust manifold
JP2009024654A (en) * 2007-07-23 2009-02-05 Bosch Corp Exhaust emission control device for internal combustion engine, mixer plate, mixer unit, and press molding device for mixer plate

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JPH0765684B2 (en) * 1989-12-13 1995-07-19 日本ラインツ株式会社 Metal gasket
KR100549913B1 (en) * 2002-04-04 2006-02-06 니혼 메타루 가스켓토 가부시키가이샤 Metallic gasket
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JPS6152938A (en) * 1984-08-22 1986-03-15 Nippon Metal Gasket Kk Forming method of die for bead forming of metallic gasket and its die
JPS62177363A (en) * 1986-01-30 1987-08-04 Yuusan Gasket Kk Gasket for exhaust manifold
JP2009024654A (en) * 2007-07-23 2009-02-05 Bosch Corp Exhaust emission control device for internal combustion engine, mixer plate, mixer unit, and press molding device for mixer plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5911163B1 (en) * 2015-05-10 2016-04-27 有限会社 東進車輌工業 Metal gasket for exhaust pipe

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