CN108104934A - The connector of exhaust pipe - Google Patents

The connector of exhaust pipe Download PDF

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Publication number
CN108104934A
CN108104934A CN201711200648.3A CN201711200648A CN108104934A CN 108104934 A CN108104934 A CN 108104934A CN 201711200648 A CN201711200648 A CN 201711200648A CN 108104934 A CN108104934 A CN 108104934A
Authority
CN
China
Prior art keywords
exhaust pipe
exhaust
opening
sensor
concave portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711200648.3A
Other languages
Chinese (zh)
Inventor
川上展弘
木户祐辅
堀澄人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Publication of CN108104934A publication Critical patent/CN108104934A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/18Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/008Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • F01N13/10Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/18Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844Mechanical joints
    • F01N13/1855Mechanical joints the connection being realised by using bolts, screws, rivets or the like
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/08Other arrangements or adaptations of exhaust conduits
    • F01N13/10Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • F01N13/105Other arrangements or adaptations of exhaust conduits of exhaust manifolds having the form of a chamber directly connected to the cylinder head, e.g. without having tubes connected between cylinder head and chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/02Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the distance of the apparatus to the engine, or the distance between two exhaust treating apparatuses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets or the like

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Exhaust Silencers (AREA)

Abstract

A kind of connector for the exhaust manifold and exhaust pipe for being used to connect internal combustion engine, including flange section, projection section and attachment part.Flange section has the plate shape with opening, is configured to be fixed to exhaust pipe in the state connected with exhaust pipe in opening.Projection section is arranged on the outside in opening in the radial direction of opening protrude from flange section, is constructed so that the sensor for being configured to the ingredient of detection exhaust gas being attached to projection section, and is configured to a part for the outer circumferential surface fixed to exhaust pipe.Attachment part is stretched out from flange section, and is constructed so that the guard member for covering exhaust pipe being attached to attachment part.

Description

The connector of exhaust pipe
Technical field
It is used for the present invention relates to a kind of by the exhaust manifold (exhaust manifold) and exhaust pipe of internal combustion engine The connector that (exhaust pipe) is connected to each other.
Background technology
In general, the exhaust system structure of internal combustion engine includes being connected to the exhaust manifold of cylinder and be arranged at from exhaust manifold Waste gas stream downstream side on purifier.In addition, it is set in the exhaust pipe that exhaust manifold and purifier are connected to each other Sensor is equipped with, sensor detection such as exhaust gas-fuel ratio or NOx concentration (hereinafter, being called " exhaust gas constituents "), and The information detected by sensor is used to control internal combustion engine.
In the component for forming exhaust passage, such as exhaust manifold, exhaust pipe and purifier provide to prevent exhaust gas Heat reach peripheral unit guard member.For example, patent document 1 discloses such a structure, wherein, along from attachment method The exhaust pipe that orchid extends to cylinder head sets hot baffle (guard member).In this structure, the upstream-side-end of hot baffle passes through spiral shell Bolt is attached to the internal thread hole being formed in attachment flange.In other words, the upstream-side-end of hot baffle is directly fastened and consolidated Surely the attachment flange of exhaust pipe is arrived, and without using by casting the attachment boss (boss, axle sleeve) formed or needing the branch welded Frame.Therefore, according to the structure of patent document 1, it is stated that process becomes simple and can inhibit the increase of manufacture cost.
Relevant technical literature
Patent document
[patent document 1] JP-A-2012-211556
The content of the invention
Technical problem
In view of as described above the problem of forms the present invention, and the purpose of the present invention is improve in the connector of exhaust pipe Sensor accuracy of detection, and realize number of parts reduction and manufacture cost reduction.The invention is not restricted to the purpose, And it is another object of the present invention to also present come from for perform shown in the embodiment of following inventions each construction Operating effect, and the operating effect is can not to be obtained by the technology of association area.
According to the present invention, a kind of connector for the exhaust manifold of internal combustion engine and exhaust pipe to be connected to each other is provided, is wrapped It includes:
Flange section, with plate shape, the plate shape is with opening formed therein and is configured in opening and row Exhaust pipe is fixed in the state of tracheae connection;
Projection section (boss portion) is arranged on the outside in the radial direction, in opening of opening from method Blue part is protruded, and is constructed so that the sensor for being configured to detection exhaust gas constituents being attached to projection section, and is configured to solid Surely a part for the outer circumferential surface of exhaust pipe is arrived;And
Attachment part stretches out from flange section, and is constructed so that the guard member for covering exhaust pipe being attached to attached Socket part point.
Description of the drawings
Fig. 1 is the decomposition perspective view for showing the exhaust system structure together with internal combustion engine according to one embodiment.
Fig. 2 is the sectional view of the major part of the exhaust system structure of Fig. 1.
Fig. 3 is for illustrating decomposition perspective view of the guard member compared with the attachment structure of connector.
Fig. 4 is the front view (view in terms of from the one side that exhaust pipe is attached) of the connector of Fig. 3.
Fig. 5 is the side view for the configuration of the exhaust system structure of definition graph 1.
Specific embodiment
In such as structure of patent document 1, it can become to be not essential for being attached boss of guard member etc., still Boss for the sensor to be attached to exhaust pipe is necessary.In other words, even if will protect as described in patent document 1 Guard directly fastens and fixed to the flange for exhaust manifold and exhaust pipe to be connected to each other, sensor is attached to exhaust Pipe, it is also desirable to which then boss is fixed to exhaust pipe by pair sensor being dividually attached with flange preparation boss.Therefore, patent The structure of document 1 is manufactured into present aspect with room for improvement in reduction number of parts and reduction.
In addition, in general exhaust system structure, since exhaust discrimination is flowed through in the exhaust gas addition flowed out from multiple exhaust outlets It the process of pipe and is mixed with each other in exhaust pipe to flow into purifier, so when exhaust gas is close to purifier, flow path can It can become complicated.Accordingly, there exist it is such the problem of:Due to sensor position on the downstream side of exhaust pipe (that is, closer to net Makeup is put), so the mode of exhaust gas impact microphone may change, may be decreased so as to the accuracy of detection of sensor.
In view of as described above the problem of and invent the present invention, and the purpose of the present invention is improve exhaust pipe connector in Sensor accuracy of detection, and realize number of parts reduction and manufacture cost reduction.The invention is not restricted to the purpose, And it is another object of the present invention to also present come from for perform shown in the embodiment of following inventions each construction Operating effect, and the operating effect is can not to be obtained by the technology of association area.
The exhaust system knot of the internal combustion engine of connector with the exhaust pipe as one embodiment will be described with reference to the drawings Structure.Following embodiment is only example, it is not intended that excludes various modifications being not explicitly described in the examples below and technology Using.
[1. construction]
[1-1. engines]
The engine (internal combustion engine) 40 that will be applied to show in Fig. 1 according to the exhaust system structure of this embodiment.This is implemented The engine 40 of example is mounted in the multicylinder engine on vehicle (not shown).In the following description, it is mounted in engine 40 The direction of engine 40 defined in state on vehicle.In other words, determined with reference to the vehicle that engine 40 is mounted thereon Its front-rear direction and left and right directions.In addition, the direction of gravity is defined as downwards, and by opposite to that direction be defined as to On.In Fig. 1, the cylinder head 41 of engine 40 and cylinder block 42 are shown in a simplified manner.
Engine 40, which has, is fixed to mutual cylinder head 41 and cylinder block 42.It in this embodiment, will be as description Situation, wherein above cylinder block 42 cylinder head 41 and bent axle is set to extend in the lateral direction.In other words, this embodiment Engine 40 is that the direction of horizontal positioned engine, wherein cylinder head 41 and cylinder block 42 parallel arrangement is vertical direction.Cylinder Direction that lid 41 and cylinder block 42 are arranged in parallel and the extending direction of bent axle may with it is each in vertical direction and left and right directions It is strictly not consistent, but for example may have small angle compared with vertical direction and left and right directions.
Multiple cylinders are set in parallel on left and right directions in engine 40.The exhaust manifold 2 of exhaust passage will be formed It is connected to each in these cylinders.Exhaust manifold 2 has such shape, and the upstream side of wherein waste gas stream is branched into multiple points Branch, and side is merged into one downstream.The exhaust gas discharged from each cylinder is collected into during exhaust manifold 2 is flowed through One place.
The exhaust manifold 2 of this embodiment is constructed in cylinder head 41.Specifically, in overhang (overhang Portion exhaust manifold 2) is constructed in 41a, in overhang 41a, side of the cylinder head 41 in exhaust gas side is outwardly. The cylinder head 41 of this embodiment is so provided:So that overhang 41a protrudes backward.In other words, the exhaust discrimination of this embodiment Pipe 2 is located at behind the cylinder of engine 40.
Position is formed on the side of the overhang 41a of cylinder head 41 (being the outer surface towards rear in this embodiment) Opening 2h (hereinafter, being called exhaust outlet 2h) in the downstream of exhaust manifold 2.In addition, around exhaust outlet 2h formed with The vertical plane surfaces for attachment 41b in waste gas stream direction.The surfaces for attachment 41b of this embodiment is arranged in vertical direction and left and right The surface being unfolded on direction.Multiple fastener hole 41h are formed on surfaces for attachment 41b, fastener (not shown) is fastened to fastening Hole 41h.In this embodiment, four fastener hole 41h are arranged at substantially regular intervals on the circumferencial direction of exhaust outlet 2h.
[1-2. exhaust system structures]
Included according to the exhaust system structure of this embodiment:Purify the purifier 3 of exhaust gas, above-mentioned exhaust manifold 2, will be useless The connection that gas is directed to the exhaust pipe 4 of purifier 3 and is arranged between exhaust manifold 2 and exhaust pipe 4 from exhaust manifold 2 Connector 1 at part.In addition, further comprised according to the exhaust system structure of this embodiment:Via 1 row of being attached to of connector The sensor 5 of tracheae 4, for surround the excircle of sensor 5 with stop the sender unit cap 6 of heat and covering 4 He of exhaust pipe The thermal protector 8 of purifier 3 (guard member is shown in Fig. 3).
Purifier 3 includes:It keeps the filter (not shown) of the particulate matter in exhaust gas here and aoxidizes or go back procapsid The catalyst (not shown) of predetermined ingredient in exhaust gas in 3A.The housing 3A of this embodiment is by main part 3c and intake section 3b and exit portion 3d is formed, and main part 3c is formed as substantially cylindrical shape, intake section 3b and exit portion 3d It is respectively fixed to the both ends of main part 3c.Main part 3c is for the part of containing catalyst etc..In addition, intake section 3b It is the part for the entrance to form the exhaust gas in purifier 3.Intake section 3b is formed towards what upstream side diameter was gradually reduced Hollow shape.The upstream end of intake section 3b is connected to exhaust pipe 4.On the other hand, exit portion 3d is formed in purifier 3 Exhaust gas outlet part.Exit portion 3d is formed towards the hollow shape that downstream side diameter is gradually reduced.Exit portion The downstream of 3d is connected to pipe 7, and pipe 7 is connected to another purifier (not shown).
Exhaust pipe 4 forms the exhaust passage between exhaust manifold 2 and purifier 3.In other words, exhaust pipe 4 is arranged on On upstream side on the downstream side of waste gas stream from exhaust manifold 2 and compared with the waste gas stream of purifier 3.4 shape of exhaust pipe As the shape of arc, so that the direction of the opening at its both ends is substantially perpendicular to each other.This implementation is provided with such posture The exhaust pipe 4 of example:So that exhaust pipe extends back from exhaust outlet 2h, then it is bent downwardly.In other words, exhaust pipe 4 have to The upstream end of front opening and the downstream opened downwards.The diameter of exhaust pipe 4 is substantially uniform on waste gas stream direction.
The upstream end of exhaust pipe 4 is connected to exhaust manifold 2 via connector 1, to be connected with exhaust outlet 2h.In this embodiment In, the upstream end of exhaust pipe 4 is connected to the surfaces for attachment 41b of cylinder head 41 via connector 1.It in addition, for example will by welding The intake section 3b of the housing 3A of purifier 3 is fixed to the downstream of exhaust pipe 4.As shown in Figure 2, exhaust pipe 4 has Hole portion 4h, the hole portion are used to that the tip of sensor 5 to be allowed to stretch into exhaust pipe 4.Hole portion 4h shapes near the upstream end of exhaust pipe 4 Into, and drill on the opposite one side in the one side where swimming end positioning thereon relatively with downstream.The hole portion of this embodiment 4h is arranged on the upper side of the outer circumferential surface of exhaust pipe 4.
As shown in Figure 3, connector 1 also serves as three elements, they are for exhaust pipe 4 to be connected to exhaust manifold 2 flange, the attachment base for boss that sensor 5 is attached to exhaust pipe 4 and for being attached thermal protector 8.Connection Part 1 has the flange section 10, projection section 20 and attachment part 30 for being used separately as flange, boss and attachment base.Flange portion 10, projection section 20 and attachment part 30 is divided to be integrally formed by casting, for example, using spheroidal graphite cast-iron as material.
Flange section 10 is secured to the part of the writing board shape of exhaust manifold 2 and exhaust pipe 4.Flange section 10 has: In the thickness direction thereof through flange section opening 11, it is multiple fasten and fixed to exhaust manifold 2 (be gas in this embodiment The surfaces for attachment 41b of cylinder cap 41) fastening part 12 and the peripheral portion that is arranged between fastening part 12 adjacent to each other The concave portion 13 of office.As shown in Figure 2, such as by welding the marginal portion of the flange section 10 of opening 11 will be surrounded Upstream end fixed to exhaust pipe 4.In other words, flange section 10 is fixed in the state connected in opening 11 with exhaust pipe 4 To exhaust pipe 4.In addition, flange section 10 is fixed to exhaust manifold 2 in the state to communicate with each other in opening 11 and exhaust outlet 2h. Hereinafter, the outer surface of flange section 10 by flange section 10 be fixed to exhaust manifold 2 state in and cylinder head 41 Surfaces for attachment 41b adjoining surface, be called fastening surface 10a, and opposite to that surface is called end face 10b.
As shown in Fig. 3 and Fig. 4, fastening part 12 on the outside of opening 11 is set in radial directions, and is divided Two fastening parts 12 are set not on the upper side and lower side of opening 11 (that is, in four corners of opening 11).Implement herein In example, four fastening parts 12, and projection section 20 are set at substantially regular intervals on the circumferencial direction of opening 11 It is located between two upper fastening parts 12.These fastening parts 12 have through hole 12h, these through holes, which are separately positioned on, to be corresponded to The position of the fastener hole 41h of the surfaces for attachment 41b of cylinder head 41.Pass through the fastener (not shown) that through hole 12h will be passed through to be inserted into Fastener hole 41h is fastened to, the fastening part 12 of this embodiment is fixed to cylinder head 41.
The recessed part in 11 one side of opening that concave portion 13 is directed towards in the outer edge part of flange section 10.This is implemented The concave portion 13 of example includes two a first concave portion 13A and second concave portion 13B, opening 11 between the two the Between one concave portion, and the two the first concave portion face each others set, the second concave portion is compared with opening 11 It is arranged on the one side opposite with projection section 20.First concave portion 13A is disposed relative to opening 11 and is located on the same side Upper fastening part and lower fastening part 12 between.Second concave portion 13B is arranged between two lower fastening parts 12.Change sentence It talks about, projection section 20, fastening part 12 and concave portion 13 are arranged on the position offset with one another on the circumferencial direction of opening 11 It puts.Connector 1 is being fixed in the state of exhaust pipe 4, the second concave portion 13B is disposed adjacent to the downstream of exhaust pipe 4 (position being connected with intake section 3b).
As shown in Figure 4, the second concave portion 13B is formed as big with the recessed amount than the first concave portion 13A Recessed amount.In other words, the recessed amount Db of the second concave portion 13B is set greater than the recessed amount of the first concave portion 13A Da (Db > Da).Recessed amount Da and Db herein refers in concave portion 13 recessed most part (near opening 11) and straight The distance between line L, straight line L are connected to the edge part in the outermost of the fastening part 12 on the both sides of concave portion 13 / (it is farthest in the upward out mouth 11 of vertical direction or right and left).
As shown in Fig. 3 and Fig. 4, projection section 20 is the tubular portion that sensor 5 is attached to it.Projection section 20 with Flange section 10 is whole to be provided.Projection section 20 be arranged on the outside of the opening 11 of flange section 10 in radial directions, It is protruded in a thickness direction from the end face 10b of flange section 10.The projection section 20 of this embodiment has and flange section 10 The orthogonal axis C2 of central axis C1 of opening 11.Central axis C1 is the axis extended on the thickness direction of flange section 10 Line.In other words, the axis C2 of the projection section 20 of this embodiment is put down with the fastening surface 10a of flange section 10 and end face 10b Extend capablely.Projection section 20 has:It surrounds the inner peripheral surface 23 of axis C2, be located at the outer of 23 outside of inner peripheral surface in radial directions Wall surface 24 is arranged at the lower face 21 at both ends of inner peripheral surface 23 and outside wall surface 24 and upper surface 22.
It performs to fix the internal thread machining of sensor 5 on inner peripheral surface 23.In addition, outside wall surface 24 is formed as from flange The end face 10b of part 10 curved surface shapes that (4 one side of exhaust pipe) dangles backward.Lower face 21 be downwards (opening 11 1 Side) surface, and formed and the continuous curved surface in marginal portion of 11 flange section 10 formed therein of opening.In other words It says, lower face 21 is formed as curve form along a part for the outer circumferential surface on the upside of exhaust pipe 4.On the other hand, upper surface 22 are the surface of (one side opposite with opening 11) in the phase of face, and are formed as the flat shape vertical with axis C2.In Fig. 2 It shows, in the state connected by the cylindrical space that inner peripheral surface 23 surrounds with the hole portion 4h of exhaust pipe 4, such as will by welding Projection section 20 is fixed to a part for the outer circumferential surface of exhaust pipe 4.
As shown in Figure 3, attachment part 30 is the flat panel like portion that thermal protector 8 is attached to it.Attachment part 30 from Flange section 10 stretches out.In state of the opening 11 between two attachment parts 30, the two attachment parts 30 are set For face each other.The attachment part 30 of this embodiment is in radial directions from each first concave portion 13A of flange section 10 Outer edge part it is protruding.In other words, 30 He of attachment part is set in parallel in the radial direction in flange section 10 First concave portion 13A, 30 and first concave portion 13A of attachment part are located at compared with opening 11 on the same side.Each attachment Part 30 has the flat face of weld 31 towards 4 one side of exhaust pipe.It will be for being attached one of the L bracket 9 of thermal protector 8 Surface portion is welded to face of weld 31.Fastener hole 9h is drilled out in another surface portion of stent 9.
The heat for the exhaust gas that thermal protector 8 flows through for prevention in exhaust pipe 4 and purifier 3 reaches peripheral unit. Thermal protector 8 is formed to correspond to the shape of the outer shape of exhaust pipe 4 and purifier 3.Thermal protector 8 has to fix Fastener hole 8h and with marginal portion 8a, marginal portion 8a is formed along the outside wall surface 24 of the projection section 20 of connector 1 For arcuate shape.Make marginal portion 8a in the state of the outside wall surface 24 of projection section 20, via through fastener hole 8h and Thermal protector 8 is attached to connector 1 by the fastener (not shown) of the fastener hole 9h insertions of stent 9.The edge part of thermal protector 8 The outside wall surface 24 of 8a and projection section 20 is divided to can be used for positioning thermal protector 8.
Sensor 5 detects the ingredient of exhaust gas.The specific example of sensor 5 includes:Detect the linear of the oxygen concentration in exhaust gas NOx sensor of NOx concentration in air-fuel ratio sensor (LAFS), detection exhaust gas, etc..For example, detected by sensor 5 Information is used to control engine 40.As shown in Figure 2, sensor 5 includes:It is provided with the substantially columnar inspection of detecting element Survey part 5a, the bolt portion 5b with the outer circumferential surface that external screw thread is subject to process, with than detection part 5a and bolt portion 5b The radial dimension of portions 5c greatly and output par, c 5d for constructing leading-out terminal wherein.Detection part 5a, bolt portion 5b, portions 5c and output par, c 5d are coaxially arranged in this order.
By using the 23 tightening screw part 5b of inner peripheral surface of the projection section 20 of connector 1, sensor 5 is fixed to boss Part 20.Sensor 5 is being fixed in the state of projection section 20, exhaust pipe 4 is stretched into via the hole portion 4h through exhaust pipe 4 And provide detection part 5a.A part (the bottom surface portions 6a that will be described below) for sender unit cap 6 is inserted into portions by portions 5c Between 5c and the upper surface 22 of projection section 20.
Sender unit cap 6 is used to that heat to be prevented to reach around sensor 5.Sender unit cap 6 is formed as cup-shaped, which has Such size:Between sender unit cap 6 and sensor 5 sensor 5 is surrounded with certain interval.Sender unit cap 6 has circle Shape bottom surface portions 6a and lateral parts 6b, rounded bottom surface part 6a have the hole that is formed centrally within, and lateral parts 6b is from bottom surface sections The outer edge of 6a is divided to erect.The bottom surface portions 6a of sender unit cap 6 is abutted with the upper surface 22 of projection section 20.Sender unit cap 6 Lateral parts 6b surrounds output par, c 5d one sides from the portions 5c of sensor 5.By the hole that sensor 5 is inserted into bottom surface portions 6a And make bottom surface portions 6a between the portions 5c of sensor 5 and the upper surface 22 of projection section 20, to fix sender unit cap 6.
[1-3. configurations]
As shown in Figure 5, it is arranged on according to the exhaust system structure of this embodiment behind the cylinder of engine 40.Separately Outside, as described above, connector 1 is arranged so that projection section 20 is located at 4 top of exhaust pipe.In addition, 3 row of being arranged on of purifier On the downside of tracheae 4.In other words, purifier 3 is arranged on compared with exhaust pipe 4 on the one side opposite with projection section 20. In other words, exhaust pipe 4 in exhaust pipe 4 in the radial direction between the projection section 20 of connector 1 and purifier 3. In this way, sensor 5, exhaust pipe 4 and purifier 3 being set in parallel in this order in the radial direction in exhaust pipe 4.It is real herein It applies in example, is set in parallel these sensors 5, exhaust pipe 4 and purifier 3 in the up-down direction.
Purifier 3 is set with following state:Make the overhang 41a for being partly into cylinder head 41 of purifier 3 In the state in the space of lower section (that is, 2 lower section of exhaust manifold).In other words, provided from connector 1 towards 40 one side of engine Purifier 3.In addition, the purifier 3 of this embodiment is provided with such posture:So that the axis C3 of housing 3A is in upper and lower It upwardly extends.In other words, according to the housing 3A of this embodiment in the parallel arrangement direction phase with cylinder head 41 and cylinder block 42 Same side upwardly extends.Here, the axis C3 of housing 3A is the axis C3 of the main part 3c of housing 3A.
Similarly, connector 1 is provided with such posture:So that the axis C2 of projection section 20 prolongs in the up-down direction It stretches.In other words, the projection section 20 of connector 1 has the axis parallel with the direction of cylinder head 41 and the parallel arrangement of cylinder block 42 Line C2.In addition, the sensor 5 of this embodiment is attached along the axis C2 of the projection section 20 of connector 1.Therefore, sensor 5 With the axis parallel with the parallel arrangement direction of cylinder head 41 and cylinder block 42.In this way, in this embodiment, purifier 3 The direction being both arranged in parallel with sensor 5 along cylinder head 41 and cylinder block 42 provides.
[2. effects and effect]
[2-1. exhaust system structures]
(1) in above-mentioned exhaust system structure, provide connector 1, the connector 1 have for by exhaust manifold 2 and row Flange section 10 that tracheae 4 is connected to each other and the projection section 20 integrated with flange section 10, and by 5 company of being attached to of sensor The projection section 20 of fitting 1.In addition, be connected to the purifier 3 of the downstream of exhaust pipe 4 compared with exhaust pipe 4 be arranged on On the opposite one side of projection section 20.Therefore, sensor 5, exhaust pipe 4 and purifier 3 can be disposed compactly, and can realize Save space.In other words, in this embodiment, since sensor 5, exhaust pipe 4 are parallel in the up-down direction with purifier 3 It sets, so on the direction orthogonal with vertical direction (for example, front-rear direction and left and right directions), can inhibit sensor 5, exhaust The installation space of pipe 4 and purifier 3, to keep smaller installation space.
Further, since sensor 5 is attached to the projection section 20 for the connector 1 for being set directly at 2 downstream of exhaust manifold, So it can inhibit the variation of the mode of exhaust gas impact microphone 5.Therefore, the accuracy of detection of sensor 5 can be improved.
(2) since the direction that the projection section 20 of connector 1 has with cylinder head 41 and cylinder block 42 are arranged in parallel is parallel Axis C2 and sensor 5 be attached along axis C2, so sensor 5 can be arranged in parallel along cylinder head 41 and cylinder block 42 Direction arrangement.Therefore, because sensor 5 is can inhibit compared with the installation space of engine 40 to keep smaller installation empty Between, so this can help to save space.For example, with by sensor 5 be fixed to exhaust pipe 4 curve outer circumferential surface and be fixed on Construction close to the position of purifier 3 is compared, due to can be become the installation space of sensor 5 more according to constructed above It is small, save space it is possible that realizing.
(3) since the housing 3A of purifier 3 is in the side identical with the parallel arrangement direction of cylinder head 41 and cylinder block 42 It upwardly extends, so purifier 3 is set along the parallel arrangement direction of cylinder head 41 and cylinder block 42.It therefore, because can Inhibit purifier 3 compared with the installation space of engine 40 to keep smaller installation space, so this can help to save Space.
(4) since purifier 3 to be arranged to dangle further towards engine 40 than connector 1, so purification can be made Device 3 is closer to engine 40.Therefore, this, which can be further helped in, saves space.
(5) due to constructing exhaust manifold 2 in cylinder head 41, so can inhibit the installation space of exhaust manifold 2 to keep Smaller installation space.Accordingly, it is possible to exhaust system structure is made to more compact and further helps in saving space.
(6) due to sensor 5 by sender unit cap 6 a part insertion sensor 5 and connector 1 projection section 20 it Between, thus can while sensor 5 to be attached to projection section 20 of connector 1 attachment of sensors lid 6.Therefore, can simplify The attachment work of sender unit cap 6.Further, since need not be used for attachment of sensors lid 6 component (for example, screw, adhesive, Etc.), so this can help to the quantity of reduction part.
[2-2. connectors]
(1) above-mentioned connector 1 includes:Flange section 10, the flange section in the state connected in opening 11 with exhaust pipe 4 It is fixed to exhaust pipe 4;Projection section 20, sensor 5 are attached to the projection section;And attachment part 30, thermal protector 8 are attached It is connected to the attachment part.In other words, connector 1 also serves as three elements, these three components include:For exhaust pipe 4 to be connected The flange that is connected to exhaust manifold 2, the attachment base for the boss of attachment of sensors 5 and for being attached thermal protector 8.Cause This, exhaust manifold 2 is connected to by using connector 1 by exhaust pipe 4, can be by sensor 5 and thermal protector 8 via connector 1 It is attached to exhaust pipe 4.Therefore, with projection section 20 and attachment part 30 compared with the situation that flange section 10 is provided separately, this The quantity of part can be reduced, and this can help to reduce manufacture cost.
Further, since by projection section 20 be arranged in radial directions on the outside of the opening 11 of flange section 10 from Flange section 10 protrudes, so the sensor 5 for being attached to projection section 20 can be positioned directly in the downstream of exhaust manifold 2.Therefore, Due to the variation of the mode that can inhibit exhaust gas impact microphone 5, so the accuracy of detection of sensor 5 can be improved.
(2) since flange section 10 is recessed towards opening 11 with the peripheral portion office between multiple fastening parts 12 Concave portion 13, so can by the volume of flange section 10 reduce certain volume, the volume of the reduction is that concave portion 13 loses The volume gone.Further, since projection section 20, fastening part 12 and concave portion 13 are arranged to the circumferencial direction in opening 11 On offset with one another, so connector 1 is formed as compact shape.Therefore, this, which can aid in, saves space, and can subtract The weight of small connector 1.
(3) since attachment part 30 is protruding from concave portion 13 in radial directions, so attachment part can be reduced 30 overhang in radial directions.It is more compact therefore, it is possible to which connector 1 is made to, and it is empty to further help in saving Between.
(4) above-mentioned connector 1 is provided with the first concave portion 13A and the second concave portion 13B, and attachment part 30 is first It is stretched out in concave portion 13A, the recessed amount of recessed amount greatly than the first concave portion 13A is formed on the second concave portion 13B. In addition, the second concave portion 13B is disposed adjacent to the downstream of exhaust pipe 4.Therefore, it is convenient for by the second concave portion 13B Close to the downstream of exhaust pipe 4.It is therefore possible to perform (it is the intake section of housing 3A in this embodiment by other tube-like pieces 3b) it is welded to the work of the downstream of exhaust pipe 4.
(5) since attachment part 30 has to be attached the flat face of weld that the stent 9 of thermal protector 8 is welded to it 31, for example, compared with thermal protector 8 is directly fastened and is fixed to the situation of attachment part 30, attachment part 30 can be manufactured Obtain overhang that is thinner and can inhibit attachment part 30.If attachment part 30 is provided with internal thread hole, then by will be all Fastener such as bolt be screwed into internal thread hole come in the case of being attached thermal protector 8, it is necessary to according to the bolt portion of fastener Length ensures the thickness of attachment part 30.In addition, in this case, between ensureing between thermal protector 8 and exhaust pipe 4 Gap is, it is necessary to increase attachment part 30 from the overhang of flange section 10.On the other hand, heat is being attached via stent 9 as described above In the case of protector 8, due to being enough that flat face of weld 31 is set in attachment part 30, so attachment part 30 can be made It makes thin and can inhibit the overhang of attachment part 30.Therefore, the weight of connector 1 can be reduced.
[3. improve example]
Regardless of above-described embodiment, various improvement can be all being carried out without departing from the spirit of the present invention.It can root It selects the relative configurations of this embodiment according to needing or can be combined as.
In the above-described embodiments, though it is shown that the parallel arrangement direction of cylinder head 41 and cylinder block 42 is vertical direction Situation, but it is not specially limited its direction that is arranged in parallel.In addition, the direction (posture) of engine 40 and exhaust system knot are set Structure is not limited to those described above compared with the position of engine 40.For example, cylinder head 41 can be arranged such that overhang 41a forward Protrusion protrudes to the left and to the right.In other words, exhaust manifold 2 can be located at before the cylinder of the engine 40 or left side and the right side Face.In addition, together with this, connector 1, exhaust pipe 4, purifier 3 etc. may be provided at before engine 40 or the left side And the right side.
In the above-described embodiments, though it is shown that constructing the situation of exhaust manifold 2 in cylinder head 41, but exhaust manifold 2 can be separately provided with cylinder head 41.In the case of exhaust manifold 2 is separated with cylinder head 41, the flange section 10 of connector 1 Attachment base can not be cylinder head 41, but can for example be disposed on the flange section of the downstream of exhaust manifold 2.
This exhaust system structure is applicable not only to the multicylinder engine of such as engine 40, and suitable for single-cylinder engine Machine.By this exhaust system structure be applied to single-cylinder engine in the case of, exhaust manifold be connected to be arranged at it is more in cylinder It is each in a exhaust outlet.
In the above-described embodiments, though it is shown that the projection section 20 of connector 1 is with cylinder shape and with axis The situation of C2 (direction that the axis and cylinder head 41 and cylinder block 42 are arranged in parallel is parallel), but the shape of projection section 20 and The direction of axis C2 is not limited to those described above.Projection section 20 can be any projection section, make as long as projection section attaches Obtain the ingredient that at least sensor 5 can detect the exhaust gas in exhaust pipe 4.Similarly, the shape of the housing 3A of purifier 3 and extension Direction (direction of axis C3) is not limited to those described above.
The direction that can be arranged in parallel compared with cylinder head 41 and cylinder block 42, along the projection section 20 with connector 1 The direction attachment of sensors 5 that axis C2 intersects.It is preferable, however, that sensor 5 is arranged to orthogonal with the axis C3 of housing 3A It will not dangle farther than purifier 3 on direction.In other words, as shown in Figure 5, it is preferable that be installed as sensor 5 It is contained in the E of region, at the E of region, the maximum outside diameter part of purifier 3 is made to be upwardly extended in the side of axis C3.In other words It says, it is preferable that entire sensor 5 is arranged to be overlapped with purifier 3 on the direction of axis C3.By installing by this method Sensor 5, since sensor 5 can be inhibited on the direction orthogonal with the axis C3 of purifier 3 compared with purifier 3 Installation space, so this can help to save space.
In addition, connector 1 not necessarily be used as be thermal protector 8 the element of attachment base in the case of, can from even Fitting 1 removes attachment part 30.Even if in the case of attachment part 30 is removed, due to sensor 5, exhaust pipe 4 and purification dress It puts 3 can be as described above disposed compactly according to exhaust system structure, sensor 5 can be simultaneously improved so can realize and save space Accuracy of detection.In addition, if removal attachment part 30, then the weight of connector 1 can be reduced a certain amount, the amount of the reduction It is the weight of removed attachment part 30.
Similarly, fastening part 12 and concave portion 13 can be removed from connector 1.It is fastened for example, can be removed from connector 1 Part 12, and the fastening surface 10a of flange section 10 can be welded and be fixed to exhaust manifold 2.It in addition, can be from connector 1 Concave portion 13 is removed, and flange section 10 is formed as such as circular or rectangular simple shape.
Sensor 5 can be any sensor, if the ingredient of sensor detection exhaust gas, and it is specific to be not particularly limited it Type.Similarly, purifier 3 can include filter, catalyst for purifying exhaust etc., and it is specific to be not particularly limited it Type.
Connector disclosed above includes:Flange section, fixed to exhaust pipe;Projection section, it is convex that sensor is attached to this Platform part;And attachment part, the guard member for covering exhaust pipe are attached to the attachment part.Therefore, with for attachment of sensors With the boss of guard member etc. compared with for connecting the situation that the flange of exhaust manifold and exhaust pipe is provided separately, this can be reduced Number of parts simultaneously reduces manufacture cost.It is arranged to protrude from flange section further, since sensor is attached to its projection section, So projection section can be positioned directly in the downstream of exhaust manifold.Therefore, it is possible to inhibit the mode of exhaust gas impact microphone Variation.Therefore, the accuracy of detection of sensor can be improved.
Reference number
1 connector
2 exhaust manifolds
4 exhaust pipes
5 sensors
8 thermal protectors (guard member)
9 stents
10 flange sections
11 openings
12 fastening parts
13 concave portions
The first concave portions of 13A
The second concave portions of 13B
20 projection sections
30 attachment parts
31 face of weld.

Claims (5)

1. a kind of connector for the exhaust manifold of internal combustion engine and exhaust pipe to be connected to each other, including:
Flange section has plate shape, which carries opening formed therein, and the flange section is configured in institute It states in the state that opening is connected with the exhaust pipe and is fixed to the exhaust pipe;
Projection section, be arranged to the opening in the radial direction, on the outside of the opening it is convex from the flange section Go out, be constructed so that the sensor for being configured to the ingredient of detection exhaust gas being attached to the projection section, and be configured to fix To a part for the outer circumferential surface of the exhaust pipe;And
Attachment part stretches out from the flange section, and is constructed so that the guard member for covering the exhaust pipe being attached to The attachment part.
2. connector according to claim 1,
Wherein, the flange section has:
Multiple fastening parts, multiple fastening parts are arranged at described on the outside of the opening in the radial direction, and It is configured to be tightened and fixed to the exhaust manifold;And
Concave portion, the peripheral portion office between multiple fastening parts are recessed to the one side of the opening, and
Wherein, the projection section, the fastening part and the female part are arranged on the circumferencial direction of the opening At the position offset with one another.
3. connector according to claim 2,
Wherein, the attachment part is stretched out outward in the radial direction from the outer edge part of the female part described.
4. connector according to claim 3,
Wherein, the female part includes:
First concave portion, the attachment part stretched out from first concave portion and
Second concave portion is formed as the big recessed amount of the recessed amount with than first concave portion, and described second Concave portion is disposed adjacent to the downstream of the exhaust pipe.
5. connector according to any one of claim 1 to 4,
Wherein, the attachment part has flat face of weld, and being configured such that will be for being attached the stent of the guard member It is welded to the flat face of weld.
CN201711200648.3A 2016-11-25 2017-11-24 The connector of exhaust pipe Pending CN108104934A (en)

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JP2016229265A JP6708103B2 (en) 2016-11-25 2016-11-25 Exhaust pipe connection member

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JP2018084221A (en) 2018-05-31
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US20180149070A1 (en) 2018-05-31
EP3327265A1 (en) 2018-05-30

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