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EP3775515B1 - Ensemble moteur - Google Patents

Ensemble moteur Download PDF

Info

Publication number
EP3775515B1
EP3775515B1 EP19732139.1A EP19732139A EP3775515B1 EP 3775515 B1 EP3775515 B1 EP 3775515B1 EP 19732139 A EP19732139 A EP 19732139A EP 3775515 B1 EP3775515 B1 EP 3775515B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
exhaust
disposed
engine assembly
exhaust port
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.)
Active
Application number
EP19732139.1A
Other languages
German (de)
English (en)
Other versions
EP3775515C0 (fr
EP3775515A1 (fr
Inventor
Nagendra Kumar Dharmapuri
Loganayakan PADMANABHA PILLAI
Lakshmi Narasimhan VARADHA IYENGAR
Palani Shunmugasundaram
Praveenkumar Arunkumar
Balaji Vaidyanathan
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.)
TVS Motor Co Ltd
Original Assignee
TVS Motor Co Ltd
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 TVS Motor Co Ltd filed Critical TVS Motor Co Ltd
Publication of EP3775515A1 publication Critical patent/EP3775515A1/fr
Application granted granted Critical
Publication of EP3775515C0 publication Critical patent/EP3775515C0/fr
Publication of EP3775515B1 publication Critical patent/EP3775515B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F01N13/008—Mounting or arrangement of exhaust sensors in or on exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • 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
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
    • F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
    • 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
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/04—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for motorcycles

Definitions

  • the present subject matter relates generally to an engine assembly for a two or three-wheeled vehicle, and more particularly but not exclusively to an exhaust emission system for the engine assembly.
  • a vehicle comprises of a frame assembly extending rearwardly from a head tube.
  • the frame assembly acts as a skeleton and a structural member for the vehicle that supports the vehicle loads.
  • At least one front wheel is connected to a front portion of the frame assembly through one or more front suspension(s).
  • the frame assembly extends towards a rear portion of the vehicle.
  • At least one rear wheel is connected to a frame assembly through one or more rear suspension(s).
  • the frame assembly comprises of an engine assembly coupled to it.
  • the engine assembly is functionally connected to the rear wheel, which provides forward motion to the vehicle.
  • a muffler assembly is provided at a lateral side of the vehicle mounted to the frame assembly or the vehicle through a mounting bracket.
  • the muffler assembly extends in a rearward direction along the length of the vehicle.
  • An exhaust port is provided in the engine assembly through which an exhaust pipe extends in a reverse direction forming a part of the muffler assembly.
  • These vehicles incorporating the internal combustion engine are powered by gasoline or diesel. Combustion process that takes place in the internal combustion engine is converted into mechanical energy for producing the required amount of power and torque. Also, the combustion process generates exhaust gas that is to be scavenged into the atmosphere.
  • An exhaust system is very essential system of the vehicle as the exhaust gasses are to be carefully treated before emitting into the atmosphere. Also, the exhaust system is essential to determine the effective working of the engine.
  • the muffler assembly is provided to dampen the noise arising from the engine.
  • the muffler assembly also comprises of a catalytic converter which helps in oxidation of the NOX into harmless oxides which are ultimately released in the atmosphere.
  • the engine includes a cylinder head which has a projected portion projected outwardly from a head main body.
  • the projected portion projects obliquely downward direction when viewed from the direction of the cylinder axis.
  • the oxygen concentration sensor is mounted in the projected portion. A main body portion of the oxygen concentration sensor and the detection portion overlap the projected portion when viewed from the direction of a cylinder axis A.
  • EP3048286A1 discloses a fixing structure for an exhaust gas sensor for an internal combustion engine with a cylinder head having two exhaust port sections and a collective exhaust port section.
  • EP3048286A1 is addressing the problem that may occur due to possibility of the exhaust gas currents from the two upstream exhaust port sections flow onto the exhaust gas sensor in the downstream collective exhaust port section without being sufficiently intermixed, because of which the sensing accuracy of the exhaust gas sensor is poor. Therefore, EP3048286A1 discloses a cylinder head having an exhaust gas sensor fixed to an inner wall of the collective exhaust port section.
  • the collective exhaust port section has a second inner wall opposite to the first mentioned inner wall to which the exhaust gas sensor is fixed, and the second inner wall is formed, in an upstream region relative to the exhaust gas sensor, with an exhaust gas guide part bulging out on the second inner wall to guide exhaust gas toward the exhaust gas sensor.
  • the engine assembly is mounted to the body frame or is swingably connected to the frame assembly.
  • the engine assembly is provided with an air supply system and a fuel supply system that supply air-fuel mixture from an air filter and a fuel tank respectively. Combustion of air-fuel mixture takes place in a cylinder portion of the engine assembly.
  • the combustion process either in two-stroke or four-stroke engine creates reciprocating motion of a piston disposed therein.
  • the reciprocating motion of the piston is converted into rotary motion of the crankshaft thereby generating desired power/torque that gets transmitted to at least one wheel of the vehicle.
  • a two-wheeled vehicle is operated through an engine assembly which is horizontally coupled to the rear end of the frame assembly and a fuel tank disposed between the rear portions of the pair of the side tubes.
  • Air fuel mixture is supplied to the engine assembly by means of a carburetor. Thereafter combustion of the air fuel mixture takes place so that a piston disposed in the engine assembly is set into motion.
  • the piston is operated in a linear motion, after which said liner motion is converted to a rotational motion, wherein said rotational motion is transferred to the rear wheel finally resulting into motion of the vehicle.
  • This mechanism also results in generation of power and torque by the engine assembly.
  • an exhaust system of a two wheeled vehicle extends in a downward manner from the engine assembly and further extending rearwardly along the length of the vehicle.
  • the un-burnt air-fuel mixture in form of exhaust gases is emitted in the atmosphere after a proper oxidation reaction which takes place in the muffler assembly.
  • the exhaust gases enter the exhaust system through a main exhaust pipe and later pass through the adapter to the catalytic converter for conversion.
  • the air-fuel mixture defines the fuel consumption and performance of the engine.
  • a closed loop control is used to control air-fuel mixture thereby providing fuel economy and providing reduced emissions.
  • a lambda sensor is mounted to the engine assembly to quantify the oxygen concentration or concentration of other gases depending on which a control system modifies the fuel quantity.
  • the lambda sensor is mounted in the exhaust pipe of the engine assembly.
  • the exhaust pipe is a connection between the exhaust port and the muffler.
  • the lambda sensor placed in the exhaust pipe is considerably away from the exhaust port.
  • the temperature of the exhaust gases is the highest at the exhaust port.
  • the temperature reduces as the exhaust gases traverse away from the exhaust port through the exhaust pipe.
  • the lambda sensor may not provide appropriate results by sensing the available exhaust gases in the exhaust pipe. Therefore, in order to obtain more accurate results from the lambda sensor, it is desirable to dispose the lambda sensor closer to the exhaust port.
  • the lambda sensor used to measure the oxygen concentration of exhaust gas in the engine assembly is preferably placed at nearest point where the exhaust temperature is high enough to measure the oxygen concentration in exhaust gasses exiting from the cylinder head exhaust port.
  • the cylinder head of the engine assembly is an integral cylinder head type including a cylinder head cover as an integral part and a split cylinder head type including a separate cylinder head cover.
  • a split cylinder head type engine numerous dynamic parts including the valves, the valve train parts are to be assembled during multiple assembly operations due to presence of multiple split parts.
  • the time taken to assemble the dynamic parts is more and also the split cylinder head type engine has more number of parts.
  • the cost of the split cylinder head type engine is also increased due to more number of parts.
  • the lambda sensor in both the integral cylinder head type and the split cylinder head type can be disposed outside a fin area in the cylinder head by providing a suitable boss to accommodate the lambda sensor.
  • the fins extend till the end of the exhaust port. Therefore, in the split cylinder head type engine assembly, it is challenging and tedious to accommodate the lambda sensor.
  • the lambda sensor is accommodated by providing a suitable boss projected beyond the exhaust port.
  • a projected boss is not desirable, because, the lambda sensor will also correspondingly project out of the projected boss and away from the exhaust port.
  • the lambda sensor closer to the exhaust port is always associated with packaging issues due to interference with layout design, sub-system level interface issues and also the lambda sensor disposed in the cylinder head adds to the weight of the cylinder head.
  • the at least one detecting member in known art when disposed away from the exhaust port is often subject to high concentration of contamination in the exhaust gases due to more accumulation of the exhaust gases and also until the exhaust gases reaches the at least one detecting member disposed away from the exhaust port. Under such circumstances, the catalytic action performed on the exhaust gases increases and which may result in quicker deterioration of the catalyst, which further, calls for frequent servicing for replacement of the catalytic converter.
  • the exhaust gases after passing out of the locus point enter into the exhaust pipe and expand there within, which may lead to inappropriate detecting of the oxygen concentration by the at least one detecting member.
  • the engine assembly according to the present invention is therefore as defined in claim 1.
  • a two-wheeled vehicle includes an engine assembly comprising a cylinder, a cylinder head attached to the cylinder. Further, a cylinder head cover is disposed upon the cylinder head to cover at least a portion of the cylinder head.
  • the cylinder head of the engine assembly includes one or more ports. The one or more ports include at least one input port and at least one exhaust port for intake and exhaust of the air-fuel mixture and the exhaust gases respectively.
  • At least one detecting member for detecting the oxygen concentration in the exhaust gases emitted from the exhaust port is disposed in the exhaust port.
  • the at least one detecting member will accordingly detect the oxygen concentration in the exhaust gases inside the exhaust port and send the signals to a controller configured to provide input signals for appropriate action of a catalyst.
  • the at least one detecting member is, for example, a lambda sensor also called as an oxygen sensor.
  • the at least one detecting member is disposed in the exhaust port.
  • the exhaust port includes an originating portion, from which the exhaust gases from the combustion chamber originate to traverse through the exhaust port.
  • the exhaust port further includes an emerging portion, through which the exhaust gases are emerging outside of the exhaust port to travel into an exhaust pipe connecting between the exhaust port and a muffler.
  • the exhaust port includes an exhaust path traversing between the originating portion and the emerging portion, the exhaust path is for traversing of the exhaust gases in the exhaust port.
  • the exhaust port is adjoined by an exhaust pipe to pass on the exhaust gases to the muffler.
  • the exhaust port and the exhaust pipe together are so designed to form a curved structure including an increasing curve in the exhaust port and a decreasing curve in the exhaust pipe.
  • the increasing curve and the decreasing curve form a locus point disposed at a junction between the exhaust port and the exhaust pipe.
  • the locus point so formed is sandwiched at the mating surface such that it is between the exhaust port and the exhaust pipe.
  • the curved structure is elevated at the locus point.
  • the locus point in the exhaust port is where the exhaust gases are accumulated inside the exhaust port having a greater cross-section, wherein abundant exhaust gases are available for the at least one detecting member for sensing the oxygen concentration appropriately.
  • the at least one detecting member is disposed ahead of the locus point in the curved structure. Such that, abundance of the exhaust gases are readily available for detecting of the oxygen concentration by the at least one detecting member.
  • the exhaust path inside the exhaust port is connected with a continuous exhaust path inside the exhaust pipe to let the exhaust gases outside into the atmosphere through the muffler.
  • At least a portion of the cylinder head, forming the exhaust path includes a depression configured to receive at least a portion of the at least one detecting member.
  • the at least one detecting member includes a detecting portion disposed inside the depression.
  • the depression includes a threaded hole configured to receive the detecting portion of the at least one detecting member.
  • the cylinder head covered by the cylinder head cover also includes a contour comprising a 'C' shape in conformation and in-line with the depression. Such that, the cylinder head portion and the cylinder head cover portion at a proximity to the at least one detecting member do not interfere with the at least one detecting member.
  • the threaded hole provides a stable mounting of the at least one detecting member inside the exhaust port in the cylinder head. This ensures that minimum vibrations and other impacts are transferred to the at least one detecting member during the engine assembly operation.
  • the exhaust port, and the exhaust pipe forming the curved structure is disposed below a horizontal component passing through the locus point in the exhaust port.
  • the curved structure is disposed with respect to the detecting portion such that the horizontal component passing through the locus point and the detecting portion is always a tangent to the curved structure.
  • the at least one detecting member is disposed in any of the orientation with respect to the horizontal component.
  • Any of the orientations of the detecting member with respect to the horizontal component includes a vertical direction, a horizontal direction, and at an angle in the range of 0 degrees to 90 degrees.
  • Fig. 1 illustrates a left side view of an exemplary two-wheeled vehicle 200, in accordance with an embodiment of the present subject matter.
  • Arrows provided in the top right corner of each figure depicts direction with respect to the vehicle, wherein an arrow F denotes front direction, an arrow R indicates rear direction, an arrow Up denotes upward direction, and an arrow Dw denotes downward direction.
  • the vehicle 200 includes a frame assembly 201 that extends rearward from a head tube 201A.
  • the frame assembly 201 extends along in a longitudinal direction F-R of the vehicle 200.
  • the frame assembly 201 includes a mainframe comprising a main tube 201B extending rearward from a rear portion of the head tube 201A and a down tube 201C that extends rearwardly downward from the head tube 201A.
  • the frame assembly 201 may further comprise a sub-frame formed by a pair of rear tubes that extend obliquely rearward from the main frame.
  • An engine assembly 100 is mounted to the main frame of the frame assembly 201.
  • the engine assembly 100 acts as the power unit of the vehicle 200, wherein the power unit may also include a traction/electrical motor (not shown).
  • the engine assembly 100 is coupled to an exhaust assembly 110 that scavenges exhaust gases there through.
  • a front portion of a swing arm 115 is swingably connected to the frame assembly 201 and a rear portion of the swing arm 115 rotatably supports a rear wheel 120.
  • the rear wheel 120 is functionally coupled to the engine assembly 100 through a transmission system/member 125.
  • the transmission system 125 includes a chain drive coupled to an output of manual gear transmission.
  • the transmission system 125 may include an automatic transmission or continuously variable transmission.
  • the swing arm 115 is coupled to the frame assembly 201 through one or more rear suspension(s) (not shown).
  • a mono-shock rear suspension connects the swing arm 115 to the frame assembly 201.
  • a pair of front forks 130 supports a front wheel 135 and is steerably supported by the head tube 201A.
  • a handlebar assembly 140 is connected to an upper portion of the pair of front forks 130.
  • a front fender 145 covers at least a portion of the front wheel 135 and the front fender assembly 145 is mounted to the front forks 130.
  • a fuel tank 150 is mounted to the main tube 201B of the frame assembly 201 and disposed rearwardly of the handlebar assembly 140.
  • a seat assembly including a rider seat 155 and a pillion seat 160 is disposed rearwardly of the fuel tank assembly 150 and is supported by the rear tubes.
  • a pair of rider foot pegs 165 is disposed on either sides and is mounted to the frame assembly 201 of the vehicle that supports rider foot.
  • a rear fender 170 is disposed upwardly of the rear wheel 120 covering at least a portion of the rear wheel 120.
  • the engine assembly 100 is functionally coupled to an air-fuel supply system (not shown) that supplies air and fuel to the engine assembly 100.
  • the torque/power output of the engine assembly 100 is transferred to a drive sprocket (not shown).
  • a chain drive 125 is coupled to the drive sprocket.
  • a sprocket cover encloses the drive sprocket and at least a portion of the chain drive 125.
  • the vehicle 200 includes various electrical and electronic systems including a starter motor (not shown), a headlamp 175, a vehicle control unit, and a tail lamp 180.
  • the vehicle includes safety systems including a synchronous braking system (not shown), and an anti-lock braking system.
  • Fig. 2 depicts a left side view of the engine assembly 100, in accordance with the embodiment.
  • the engine assembly 100 includes at least one cylinder head 102 comprising at least one intake valve (not shown) and at least one exhaust valve (not shown).
  • the cylinder head 102 is mounted to a cylinder block 101.
  • the cylinder block 101 defines a cylinder portion and a piston (not shown) is radially enclosed by the cylinder portion.
  • the cylinder head 102 is covered by a cylinder head cover 109 from a top direction.
  • the cylinder block 101 is mounted to a crankcase 202.
  • the engine assembly 100 is forwardly inclined type. The inclination is of a piston axis defined by reciprocating motion of the piston.
  • a vertical or a horizontal engine may be used.
  • the cylinder head 102 includes one or more ports.
  • the one or more ports include at least one intake port 106 and at least one exhaust port 103.
  • the crankcase 202 rotatably supports plurality of engine components including the crankshaft.
  • the reciprocating motion of the piston is converted into the rotary motion of the crankshaft.
  • the engine assembly 100 includes a clutch assembly (not shown) mounted on one lateral side of the engine assembly and a magneto or an integrated starter generator (not shown) is mounted to another side of the engine assembly 100.
  • the clutch assembly is enclosed by a clutch cover (not shown) that is mounted to the crankcase 202.
  • the magneto is enclosed by a magneto cover 203 that is mounted to the crankcase 202.
  • the clutch cover is disposed on the right hand side RH of the engine assembly and the magneto cover 203 is disposed on the left hand side LH of the engine assembly 100.
  • a gear actuation drum (not shown) is coupled to a gear arm that is coupled to a gearshift lever for shifting gears.
  • a sensor is mounted to the crankcase body for identifying the gear position. In one embodiment, the sensor is mounted to identify the crankshaft speed.
  • Fig. 3 illustrates a top view of a cylinder head of the engine assembly.
  • the cylinder head 106 comprises the at least one exhaust port 103. At least a portion of the cylinder head 106 is configured to form the exhaust port 103. The at least a portion of the cylinder head 106 on a top surface 103Ts of the exhaust port 103 is configured to form a depression 301.
  • Fig. 4 is a sectional view of the cylinder head assembly taken along A-A axis as shown in the Fig. 3 .
  • the exhaust port 103 includes an originating portion 103a, from which the exhaust gases originate after undergoing combustion in the combustion chamber in the cylinder block 101. Further, after originating from the originating portion 103a, the exhaust gases traverse through the exhaust path 103ca inside the exhaust port 103.
  • the exhaust port 103 ends at an emerging portion 103b, from which the exhaust gases emerge out of the exhaust port 103 and enter the exhaust pipe 104.
  • the exhaust pipe 104 includes a continuous exhaust path 103cb there within, through which the exhaust gases are passed on to a muffler (not shown) to let the exhaust gases out into the atmosphere.
  • the cylinder head 106 includes a depression 301 extending through the exhaust port 103.
  • Fig. 5 illustrates a sectional view of the cylinder head assembly including at least one detecting member, the section is taken along A-A axis as shown in the Fig. 3 .
  • the exhaust port 103 includes at least one detecting member 105 to detect one or more gaseous components in the exhaust gas traversing along the exhaust path 103ca from the originating portion 103a to the emerging portion 103b.
  • the exhaust port 103 is adjoined by the exhaust pipe 104.
  • the exhaust port 103 and the adjoining exhaust pipe 104 include an outer circumferential surface 108a, 108b to form a curved structure.
  • the outer circumferential surface 108a, 108b includes an increasing curve 108a, which is an outer circumferential surface of the exhaust port 103, and a decreasing curve 108b, which is an outer circumferential surface of the intake port 106.
  • the increasing curve 108a and the decreasing curve 108b includes a locus point 107 sandwiched at the mating interface between the exhaust port 103 and the exhaust pipe 104.
  • the increasing curve 108a is elevated at the locus point 107.
  • the cross section of the exhaust port 103 is the highest, the exhaust gases accumulated are considerably abundant at this cross-section and the at least one detecting member 105 disposed at the locus point 107 is readily available to detect the exhaust gases.
  • the at least one detecting member 105 includes a detecting portion 105a disposed upstream of and at a close proximity to the locus point 107 in the exhaust port 103. Such that, the at least one detecting member 105 can readily detect the one or more required gaseous components from the abundantly available exhaust gases around the locus point 107. This results in an accurate working of the at least one detecting member 105, which further results in efficient usage of the catalytic converter.
  • Fig. 6 is a sectional view of the cylinder head assembly taken along A-A axis as shown in the Fig. 3 .
  • the detecting portion 105a of the at least one detecting member 105 and the locus point 107 are disposed to be in-line along the exhaust port.
  • a horizontal component HZ passing through the detecting portion 105a and the locus point 107 are disposed with respect to the outer circumferential surface 108a, 108b such that the horizontal component HZ is always a tangent to the outer circumferential surface 108a, 108b.
  • the outer circumferential surface 108a, 108b including the at least one detecting portion 105a is always disposed below the horizontal component HZ, such that a top most portion 105Tp of the at least one detecting member 105 is always disposed below an axis PP' passing through the cylinder head cover 109.
  • the axis PP' is the highest point in the cylinder head. This ensures that the at least one detecting member 105 does not interfere with other surrounding parts of the engine assembly 100 and other surrounding vehicular parts.
  • at least a portion of the at least one detecting member 105 is surrounded by the cylinder head 102, thereby protecting the at least a portion of the at least one detecting member 105.
  • the at least one detecting member 105 is disposed at an offset to the axis PP' when viewed from a top view.
  • the at least one detecting member 105 includes a central axis 105b passing centrally longitudinally through the at least one detecting member 105, the orientations of the central axis 105b of the at least one detecting member 105 with respect to the horizontal component HZ includes a vertical direction, a horizontal direction, and at an angle in the range of 0 degrees to 90 degrees.
  • Fig. 7 illustrates a top perspective view of the cylinder head assembly.
  • the at least a portion of the cylinder head 109 includes the depression 301 configured to receive the detecting portion 105a (not shown) of the at least one detecting member 105.
  • the depression 301 includes a shape in conformation and in-line with at least a portion of the at least one detecting member 105.
  • the cylinder head cover 109 includes a 'C' shaped contour 302, which has a shape to be in conformation and in-line to the portion of the at least one detecting member 105 disposed at a proximity to the cylinder head cover 109 as shown in the Fig. 8 .
  • the depression 301 and the 'C' shaped contour 302 are configured to protect the at least one detecting member 105 from interfering with the cylinder block 102 and the cylinder head cover 109.
  • Fig.9 illustrates the depression configured in the cylinder block of the engine assembly.
  • the depression 301 in the exhaust port 103 includes a hole 301H to receive the detecting portion of the at least one detecting member (not shown). Further, the hole 301H includes plurality of serrations 301th to securely receive the detecting portion of the at least one detecting member.
  • the hole 301H is a through hole to allow the at least one detecting member to extend substantially inside the exhaust port 103 and be able to accurately detect the one or more gaseous components in the exhaust gases.
  • the depression 301 in the cylinder head is disposed along a plane Y, which is situated lower to another plane X comprising a cylinder head wall 303 which forms the encompassing boundary of the cylinder head in the vicinity of the depression 301.
  • the at least one detector (not shown) disposed in the plane Y is always protected by the cylinder head wall 303 that is disposed in a higher plane X. Further, the at least one detector disposed in the plane Y also ensures that the at least one detector member does not project out of the cylinder head 102 and thus, is protected from being hit by the surrounding objects and even during handling of the engine assembly and also during assembling into the vehicle.

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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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (10)

  1. Ensemble moteur (100) pour un véhicule (200), ledit ensemble moteur (100) comprenant :
    un bloc-cylindres (101) ;
    une culasse (102) disposée sur ledit bloc-cylindres (101) ;
    un couvre-culasse (109) configuré pour enfermer au moins une partie de ladite culasse (102) ;
    un ou plusieurs orifices (103, 106) disposés dans ladite culasse (102), ledit ou plusieurs orifices (103, 106) comprenant au moins un orifice d'admission (106) et au moins un orifice d'échappement (103) ;
    un tuyau d'échappement (104) ; et
    au moins un ou plusieurs éléments de détection (105) pour détecter un ou plusieurs composants gazeux émis par ledit ou lesdits orifices (103, 106),
    caractérisé par le fait que
    ledit au moins un orifice d'échappement (103) comprend une partie d'origine (103a), une partie émergente (103b) et un chemin d'échappement (103ca) traversant ladite partie d'origine (103a) à ladite partie émergente (103b),
    ladite partie émergente (103b) a un point locus (107) prédéterminé, ledit point locus (107) étant pris en sandwich sur une surface d'accouplement entre ledit au moins un orifice d'échappement (103) et ledit tuyau d'échappement (104),
    dans lequel un ou plusieurs éléments de détection (105) ont une partie de détection (105a), ladite partie de détection (105a) étant disposée en avant et en amont dudit point de repère (107),
    dans lequel un ou plusieurs éléments de détection (105) ont une partie de détection (105a), ladite partie de détection (105a) étant disposée en avant et en amont dudit point de repère (107),
    dans laquelle une partie de ladite culasse (102) est disposée à proximité immédiate dudit au moins un orifice d'échappement (103), ladite partie présentant une dépression (301), ladite dépression (301) étant configurée pour recevoir ledit ou lesdits éléments de détection (105),
    dans lequel ledit au moins un orifice d'échappement (103) est fixé à côté dudit tuyau d'échappement (104), ledit au moins un orifice d'échappement (103) et ledit tuyau d'échappement (104) étant conçus ensemble pour former une structure incurvée comprenant une courbe croissante dans ledit orifice d'échappement et une courbe décroissante dans ledit tuyau d'échappement,
    dans lequel ledit au moins un orifice d'échappement (103) et ledit tuyau d'échappement (104) comprennent une surface circonférentielle extérieure incurvée (108a, 108b), ladite surface circonférentielle extérieure étant configurée avec un diamètre croissant, ladite augmentation de diamètre étant en direction dudit au moins un orifice d'échappement (103), ladite surface circonférentielle extérieure incurvée (108a, 108b) ayant un diamètre le plus élevé étant disposée au niveau dudit point de repère (107).
  2. Ensemble moteur (100) selon la revendication 1, dans lequel ladite voie d'échappement (103ca) est en continuité avec une voie d'échappement (103cb), ladite voie d'échappement (103cb) étant disposée à l'intérieur dudit tuyau d'échappement (104) et attachée de manière adjacente à l'orifice d'échappement (103).
  3. Ensemble moteur (100) selon la revendication 1, dans lequel ledit couvre-culasse (109) comprend un contour en forme de "C" (302), ledit contour en forme de "C" (302) étant configuré pour enfermer au moins une partie de ces un ou plusieurs éléments de détection (105).
  4. Ensemble moteur (100) selon la revendication 1, dans lequel ledit ou plusieurs éléments de détection (105) ont une partie supérieure (105Tp), ladite partie supérieure (105Tp) étant disposée sous ledit couvre-culasse (109).
  5. Ensemble moteur (100) selon la revendication 4, dans lequel ladite dépression (301) est disposée dans un plan Y, et ladite culasse (102) a une paroi de culasse (303), une partie supérieure de ladite paroi (303) étant disposée le long d'un plan X, dans lequel ledit plan Y est inférieur audit plan imaginaire X.
  6. Ensemble moteur (100) selon la revendication 2, dans lequel un ou plusieurs éléments de détection (105) ont un axe central (105b), ledit axe central (105b) passant au centre le long d'une direction de longueur dudit ou desdits éléments de détection (105), une ligne imaginaire horizontale (HZ) passant par ledit point de repère (107) et étant disposée à un angle par rapport audit axe (105b) dudit élément de détection (105), et dans lequel, ladite partie de détection (105a) est adaptée pour être tangentielle à ladite surface circonférentielle extérieure (108a, 108b).
  7. Ensemble moteur (100) selon la revendication 6, dans lequel ledit axe central (105b) est disposé orthogonalement à ladite ligne imaginaire horizontale (HZ).
  8. Ensemble moteur (100) selon la revendication 1, dans lequel ladite dépression (301) comprend au moins une partie disposée à l'intérieur dudit contour en forme de 'C' (302), ledit contour en forme de 'C' (302) ayant une forme conforme à au moins une partie desdits au moins un élément de détection (105).
  9. Ensemble moteur (100) selon la revendication 4, dans lequel ladite dépression (301) comprend un trou fileté (301H), ledit trou fileté (301H) étant configuré pour recevoir ladite partie de détection (105a) dudit au moins un ou plusieurs éléments de détection (105).
  10. Ensemble moteur (100) selon la revendication 7, dans lequel ledit angle est compris entre 0 et 90 degrés.
EP19732139.1A 2018-04-12 2019-04-12 Ensemble moteur Active EP3775515B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201841013990 2018-04-12
PCT/IN2019/050301 WO2019198107A1 (fr) 2018-04-12 2019-04-12 Ensemble moteur

Publications (3)

Publication Number Publication Date
EP3775515A1 EP3775515A1 (fr) 2021-02-17
EP3775515C0 EP3775515C0 (fr) 2024-04-10
EP3775515B1 true EP3775515B1 (fr) 2024-04-10

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EP (1) EP3775515B1 (fr)
BR (1) BR112020020720A2 (fr)
ES (1) ES2980998T3 (fr)
MX (1) MX2020010629A (fr)
WO (1) WO2019198107A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011064193A (ja) * 2009-08-21 2011-03-31 Yamaha Motor Co Ltd エンジンおよびそれを備える鞍乗型車両
US9890703B2 (en) * 2013-09-19 2018-02-13 Honda Motor Co., Ltd. Fixing structure for exhaust gas sensor of internal combustion engine

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BR112020020720A2 (pt) 2021-01-19
WO2019198107A1 (fr) 2019-10-17
ES2980998T3 (es) 2024-10-04
EP3775515C0 (fr) 2024-04-10
MX2020010629A (es) 2020-10-22
EP3775515A1 (fr) 2021-02-17

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