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WO2025094294A1 - Véhicule inclinable - Google Patents

Véhicule inclinable Download PDF

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Publication number
WO2025094294A1
WO2025094294A1 PCT/JP2023/039345 JP2023039345W WO2025094294A1 WO 2025094294 A1 WO2025094294 A1 WO 2025094294A1 JP 2023039345 W JP2023039345 W JP 2023039345W WO 2025094294 A1 WO2025094294 A1 WO 2025094294A1
Authority
WO
WIPO (PCT)
Prior art keywords
path
cylinder
egr
vehicle
egr cooler
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
PCT/JP2023/039345
Other languages
English (en)
Japanese (ja)
Inventor
直希 牧田
俊彦 高橋
昌樹 鳥越
直人 田島
明彦 大久保
啓二 川辺
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to PCT/JP2023/039345 priority Critical patent/WO2025094294A1/fr
Priority to PCT/JP2024/038874 priority patent/WO2025095053A1/fr
Priority to PCT/JP2024/038861 priority patent/WO2025095050A1/fr
Priority to PCT/JP2024/038879 priority patent/WO2025095056A1/fr
Publication of WO2025094294A1 publication Critical patent/WO2025094294A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M7/00—Motorcycles characterised by position of motor or engine
    • B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities

Definitions

  • the present invention relates to a lean vehicle having an EGR path.
  • Patent Document 1 discloses a motorcycle having an EGR path.
  • Patent Document 1 in order to supply efficiently cooled exhaust gas to the intake path, a portion of the EGR path is formed in the body frame, and the body frame dissipates heat from the exhaust gas.
  • Patent Document 1 states that by using the body frame to cool the exhaust gas, it is possible to downsize or eliminate the EGR cooler provided in the EGR path.
  • Lean vehicles such as motorcycles are required to have an EGR path equipped with an EGR cooler while preventing the lean vehicle from becoming too large in the lateral direction.
  • the present invention aims to provide a lean vehicle that has an EGR path equipped with an EGR cooler, while preventing the lean vehicle from becoming too large in the left-right direction.
  • a lean vehicle has the following configuration.
  • (A) (A1) a vehicle body frame including a head pipe along the vertical direction of the vehicle, and having a main frame portion having a bifurcated shape branched from the head pipe when viewed in the axial direction of the head pipe, (A2) which leans toward the right of the vehicle when turning right and leans toward the left of the vehicle when turning left;
  • (B) (B1) a cylinder portion including a cylinder body portion forming at least one cylinder hole, and a cylinder head portion connected to the cylinder body portion and constituting an end of the engine in the direction of at least one cylinder axis that is the central axis of the at least one cylinder hole, and which forms at least one combustion chamber;
  • (B2) a crankshaft that rotates around an axis along the left-right direction of the vehicle; and
  • an exhaust gas recirculation (EGR) path connecting an intake path connected to the at least one combustion chamber and an exhaust path connected to the at least one combustion chamber, and for recirculating a portion of exhaust gas passing through the exhaust path to the intake path, the lean vehicle further comprising an engine coolant path provided with a thermostat and through which a coolant other than lubricating oil flows, the thermostat being arranged inside the main frame portion having a bifurcated shape as viewed in the axial direction of the head pipe, and the EGR cooler path is formed in an EGR cooler arranged inside the main frame portion having a bifurcated shape as viewed in the axial direction of the head pipe, and includes an EGR cooler path having a lowermost end located above a lowermost end
  • the entire EGR path including the EGR cooler path is disposed above a first plane that passes through the uppermost end of the cylinder body portion disposed such that the upper portion of at least one cylinder axis is located forward in the vehicle longitudinal direction relative to the lower portion, and is perpendicular to at least one cylinder axis. Therefore, it is possible to secure a space around the cylinder body portion for arranging piping (e.g., a cooling liquid piping or an exhaust pipe) and electrical components of a path different from the EGR path while suppressing interference with the EGR path. In addition, it is possible to arrange the EGR path around the cylinder head portion while suppressing interference with the piping and electrical components arranged around the cylinder body portion.
  • piping e.g., a cooling liquid piping or an exhaust pipe
  • the EGR cooler path and the thermostat are arranged above a second plane that passes through the bottom end of the cylinder portion and is perpendicular to at least one cylinder axis, below a third plane that passes through the top end of the cylinder portion and is perpendicular to at least one cylinder axis, and inside the bifurcated main frame portion when viewed in the axial direction of the head pipe, so that (i) at least condensed water generated in the EGR cooler path returns to the exhaust path, and (ii) any two of three side surfaces, excluding the right side surface or left side surface close to the camshaft drive mechanism, of the cylinder portion arranged so that the upper part of at least one cylinder axis is located forward of the lower part and the lowermost end of the rear side surface that forms part of the intake path is located above the lowermost end of the front side surface that forms part of the exhaust path are the side surface closest to the EGR cooler path and the side surface closest to the thermostat, respectively.
  • the EGR cooler passage can be arranged so that condensed water generated in the EGR cooler passage returns to the exhaust passage, thereby simplifying the EGR cooler passage.
  • the lean vehicle has an EGR path equipped with an EGR cooler, while preventing the lean vehicle from becoming large in the left-right direction.
  • the entire EGR path including the EGR cooler path, is positioned below the third plane that passes through the top end of the cylinder section and is perpendicular to at least one cylinder axis, so the EGR path can be positioned while minimizing interference with piping (e.g., intake piping) and electrical equipment that is positioned above the top surface of the cylinder section. This makes it easier to prevent the lean vehicle from becoming larger in the lateral direction above the top surface of the cylinder section.
  • piping e.g., intake piping
  • the EGR cooler passage when the EGR cooler passage is disposed in a position close to the first cylinder head side surface inside the cylinder head portion so that the first cylinder head side surface of the cylinder head portion is the side surface closest to the EGR cooler passage, it is easy to shorten the length of the EGR passage. Therefore, even if an EGR passage provided with an EGR cooler is disposed, it is easy to prevent the lean vehicle from becoming large in the lateral direction.
  • path means a space through which an object such as a gas flows. This definition applies to the EGR path, intake path, exhaust path, and engine coolant path in this invention and the embodiments.
  • the vehicle up-down direction is the direction perpendicular to a horizontal plane when the lean vehicle is placed upright on the horizontal plane.
  • the vehicle left-right direction is the left-right direction for a rider riding on the lean vehicle.
  • the vehicle front-rear direction is the direction perpendicular to the vehicle up-down direction and the vehicle left-right direction, and is the front-rear direction for a rider riding on the lean vehicle.
  • the vehicle forward direction is the direction in which the lean vehicle moves straight.
  • the body frame when the body frame is tilted to the right of the vehicle, this means that the body frame is tilted to the right of the vehicle relative to the vertical direction of the vehicle. In other words, this means that the upper part of the body frame is tilted so that it is positioned further to the right of the vehicle than the lower part.
  • the definition of the body frame tilting to the left of the vehicle is the same as above.
  • the main frame is a part of the vehicle body frame.
  • the main frame does not have to be an independent part, as long as it has a head pipe and a bifurcated part from the head pipe.
  • the steering shaft is disposed inside the head pipe of the main frame.
  • a head pipe aligned along the vertical direction of the vehicle means a head pipe that is disposed so that the angle of the axial direction of the head pipe relative to the vertical direction of the vehicle is greater than -45° and less than +45°.
  • the rotation axis of the crankshaft is aligned along the left-right direction of the vehicle.
  • the rotation axis of the crankshaft may be parallel to the left-right direction of the vehicle when the lean vehicle is in an upright position.
  • the number of at least one combustion chamber formed by the cylinder section may be one or more.
  • the multiple combustion chambers formed by the cylinder section are arranged side by side along the left-right direction of the vehicle.
  • the engine may be a single-cylinder engine or a multiple-cylinder engine.
  • the engine may be a parallel multiple-cylinder engine having multiple combustion chambers arranged side by side in the left-right direction of the vehicle.
  • the engine may be a V-type engine having a cylinder section having at least one combustion chamber and a rear cylinder section arranged rearward of the cylinder section. The rear cylinder section is not included in the cylinder section of the present invention.
  • the number of at least one cylinder hole formed by the cylinder body portion is the same as the number of at least one combustion chamber formed by the cylinder portion.
  • the combustion chamber is formed by the cylinder hole, the piston disposed in the cylinder hole, and the cylinder head portion.
  • the multiple cylinder axes which are the central axes of the multiple cylinder holes, are parallel to each other.
  • the cylinder axis is not a line segment that exists only in the region where the cylinder bore exists, but a straight line that extends infinitely.
  • the cylinder portion is configured such that a cylinder head portion and a cylinder body portion can be separated.
  • the cylinder portion may include a gasket disposed between the cylinder head portion and the cylinder body portion.
  • At least one end of the cylinder portion in the cylinder axial direction is at least one end of the cylinder head portion in the cylinder axial direction and at least one end of the cylinder body portion in the cylinder axial direction.
  • the cylinder portion has four side surfaces. The four side surfaces of the cylinder portion do not include at least one end surface in the cylinder axial direction. The four side surfaces of the cylinder portion intersect with at least one cylinder axial direction.
  • the four side surfaces of the cylinder portion are a side surface (right side surface) seen when the cylinder portion is viewed in the left direction of the vehicle, a side surface (left side surface) seen when the cylinder portion is viewed in the right direction of the vehicle, a side surface (front side surface) seen when the cylinder portion is viewed in a direction perpendicular to a direction perpendicular to at least one cylinder axis and along the vehicle rear direction, and a side surface (rear side surface) seen when the cylinder portion is viewed in a direction perpendicular to a direction perpendicular to at least one cylinder axis and along the vehicle front direction.
  • the cylinder head portion may be composed of a plurality of separable parts, or may be composed of a single inseparable part.
  • the cylinder head portion may be composed of a plurality of parts including a head cover.
  • the cylinder head portion has four side surfaces. The definition of the four side surfaces of the cylinder head portion is the same as the definition of the four side surfaces of the cylinder portion described above.
  • the cylinder body portion may be composed of a plurality of separable parts, may be composed of a single inseparable part, or may be composed of a part of a single inseparable part.
  • the cylinder body portion and at least a part of the crankcase portion may form a single part.
  • the boundary between the cylinder body portion and the crankcase portion is located on a plane that passes through an end of at least one cylinder hole formed in the cylinder body portion and is perpendicular to at least one cylinder axis.
  • the cylinder body portion has four side surfaces. The definition of the four side surfaces of the cylinder body portion is the same as the definition of the four side surfaces of the cylinder portion described above.
  • the phrase "the upper part of at least one cylinder axis is located forward of the lower part” means that when at least one cylinder axis is divided into an upper part and a lower part by a plane perpendicular to the vertical direction of the vehicle, the upper part of at least one cylinder axis is located forward of the lower part of at least one cylinder axis in the longitudinal direction of the vehicle.
  • a cylinder portion when a cylinder portion is positioned so that the bottom end of its rear side surface, which forms part of the intake path, is located higher than the bottom end of its front side surface, which forms part of the exhaust path, this means that the cylinder portion has a rear side surface, which forms part of the intake path, and a front side surface, which forms part of the exhaust path, and the bottom end of the rear side surface of the cylinder portion is located higher in the vertical direction of the vehicle than the bottom end of the front side surface of the cylinder portion.
  • an object when an object is located above a plane perpendicular to at least one cylinder axis, it means that the object is located in the upper space of two spaces separated by the plane perpendicular to at least one cylinder axis.
  • the definition of being located below the plane perpendicular to at least one cylinder axis is the same as above.
  • the camshaft drive mechanism may be composed of, for example, a crankshaft and a plurality of sprockets or pulleys provided on at least one camshaft, and a chain or belt wound around the plurality of sprockets or pulleys.
  • the camshaft is provided to drive an intake valve that opens and closes the intake path and an exhaust valve that opens and closes the exhaust path.
  • the camshaft drive mechanism is disposed inside the engine so as to be located to the right or left of at least one cylinder hole formed in the cylinder body portion in the vehicle left-right direction.
  • a portion of the camshaft drive mechanism is disposed inside the cylinder portion so as to be aligned with the right or left side of the cylinder portion.
  • a portion of the camshaft drive mechanism is disposed inside the cylinder body portion so as to be aligned with the right or left side of the cylinder body portion.
  • the camshaft drive mechanism is closer to either the right or left side of the cylinder portion.
  • the camshaft drive mechanism is located to the left of at least one cylinder hole formed in the cylinder body portion in the vehicle left-right direction, the camshaft drive mechanism is closer to the left side of the right or left side of the cylinder portion.
  • the camshaft drive mechanism is located to the right of at least one cylinder hole formed in the cylinder body portion in the left-right direction of the vehicle, the camshaft drive mechanism is closer to the right side of the right and left sides of the cylinder portion.
  • the engine coolant path is provided to at least cool the engine.
  • the coolant flowing through the engine coolant path is not particularly limited as long as it is a liquid that has a cooling function and is not a lubricating oil.
  • the coolant may be, for example, water.
  • the engine coolant path may be provided with a coolant pump and a radiator.
  • the thermostat includes a valve and controls the flow of coolant depending on the temperature of the coolant.
  • the thermostat adjusts the flow rate of coolant sent to a radiator depending on the temperature of the coolant, for example.
  • the thermostat is, for example, a three-way valve.
  • the thermostat may also be a two-way or four-way valve.
  • the thermostat may be attached directly to the cylinder section or may be connected to the cylinder section via a coolant pipe.
  • the intake path is directly connected to at least one combustion chamber. Air supplied to at least one combustion chamber flows through the intake path. A portion of the intake path is formed inside the cylinder head. A portion of the intake path is disposed outside the engine and is formed by an intake pipe or the like. The intake path has at least one downstream end in the air flow direction. The number of at least one downstream end of the intake path may be the same as or greater than the number of combustion chambers. One or two downstream ends of the intake path may be provided for one combustion chamber. When the number of downstream ends of the intake path is multiple, the portion of the intake path including the multiple downstream ends may have a branch shape that divides the air flow.
  • the exhaust path is directly connected to at least one combustion chamber. Exhaust gas discharged from at least one combustion chamber flows through the exhaust path. A portion of the exhaust path is formed inside the cylinder head. A portion of the exhaust path is disposed outside the engine and is formed by an exhaust pipe or the like. The exhaust path has at least one upstream end in the flow direction of the exhaust gas. The number of at least one upstream end of the exhaust path may be the same as or greater than the number of combustion chambers. One or two upstream ends of the exhaust path may be provided for one combustion chamber. When the number of upstream ends of the exhaust path is multiple, a portion of the exhaust path including the multiple upstream ends may be formed to collect exhaust gas flowing in from the multiple upstream ends.
  • the EGR path is directly connected to the intake path and the exhaust path.
  • the EGR path has at least one EGR path exhaust side end connected to the exhaust path.
  • the number of the at least one EGR path exhaust side end of the EGR path may be one or more.
  • the number of the at least one upstream end of the exhaust path is one
  • the number of the at least one EGR path exhaust side end of the EGR path is one.
  • the number of the at least one upstream end of the exhaust path is multiple, the number of the at least one EGR path exhaust side end of the EGR path may be one or more.
  • the multiple EGR path exhaust side ends of the EGR path are located upstream of the position where exhaust gases flowing in from the multiple upstream ends of the exhaust path are collected.
  • the one EGR path exhaust side end of the EGR path may be located downstream of or upstream from a position where exhaust gas flowing in from the multiple upstream ends of the exhaust path is collected.
  • the EGR path may be connected to the exhaust path so that a part of the exhaust gas discharged from each of the multiple combustion chambers flows into the EGR path.
  • the EGR path may be connected to the exhaust path so that only a part of the exhaust gas discharged from at least one of the multiple combustion chambers flows into the EGR path.
  • the EGR path has at least one EGR path intake side end connected to the intake path. The number of the at least one EGR path intake side end of the EGR path may be one or more.
  • the EGR path may be provided with an EGR valve that adjusts the flow rate of exhaust gas flowing through the EGR path.
  • the EGR valve may be disposed, for example, between at least one EGR path intake end of the EGR path and the EGR cooler path.
  • the EGR cooler is configured to cool the exhaust gas flowing through the EGR path.
  • the EGR cooler may be configured to cool the exhaust gas using a coolant flowing through the engine coolant path.
  • the EGR cooler may be configured to cool the exhaust gas using an airflow generated by running a lean vehicle.
  • the EGR cooler path is the portion of the EGR path that is formed within the EGR cooler.
  • the phrase "the lowermost end of the EGR cooler path is located above the lowermost end of at least one EGR path exhaust end of the EGR path” does not relate to whether the EGR cooler path is aligned with at least one EGR path exhaust end in the vertical direction of the vehicle.
  • the lowermost end of the EGR cooler path is located above the lowermost end of the EGR path exhaust end that is located lowest among the multiple EGR path exhaust ends of the EGR path.
  • the lowermost end of the EGR cooler path may be located above the uppermost end of at least one EGR path exhaust end of the EGR path, or may be located below that.
  • the EGR cooler path is arranged so that at least condensed water generated in the EGR cooler path returns to the exhaust path.
  • This sentence means that the EGR cooler path is arranged so that condensed water generated in the EGR cooler path returns to the exhaust path.
  • this sentence means that the EGR cooler path may be arranged so that condensed water generated in a portion of the EGR path other than the EGR cooler path returns to the exhaust path.
  • Condensed water generated in the EGR cooler path returns to the exhaust path means that condensed water generated in the EGR cooler path returns to the exhaust path by gravity. Condensed water is generated when water vapor in the exhaust gas is cooled and condensed.
  • the EGR cooler path and the thermostat are arranged such that any two of the three side surfaces of the cylinder section, excluding the right side surface or the left side surface close to the camshaft drive mechanism, are the side surface closest to the EGR cooler path and the side surface closest to the thermostat, respectively.
  • the "three side surfaces of the cylinder section, excluding the right side surface or the left side surface close to the camshaft drive mechanism” refers to the three side surfaces of the cylinder section, excluding the right side surface or the left side surface close to the camshaft drive mechanism, out of the four side surfaces of the cylinder section.
  • the "side surface closest to the EGR cooler path” here refers to the side surface of the cylinder section that is closest to the EGR cooler path out of the four side surfaces of the cylinder section.
  • the "side surface closest to the thermostat” here refers to the side surface of the cylinder section that is closest to the thermostat out of the four side surfaces of the cylinder section.
  • the phrase "arranged so that the EGR cooler path faces the first side surface of the cylinder portion in a direction perpendicular to at least one cylinder axis" includes not only the case where the EGR cooler is disposed away from the first side surface of the cylinder portion, but also the case where the EGR cooler is in contact with the first side surface of the cylinder portion.
  • the phrase "arranged so that the EGR cooler path faces the first side surface of the cylinder portion in a direction perpendicular to at least one cylinder axis" does not matter the flow direction of exhaust gas in the EGR cooler path.
  • the thermostat When the thermostat is disposed such that the second side surface of the four side surfaces of the cylinder portion is the side surface closest to the thermostat, the thermostat is disposed so as to face the second side surface of the cylinder portion, or disposed at a position close to the second side surface inside the cylinder portion. "Disposing the thermostat so as to face the second side surface of the cylinder portion" includes not only the case where the thermostat is disposed away from the second side surface of the cylinder portion, but also the case where the thermostat is in contact with the second side surface of the cylinder portion.
  • the lean vehicle may be, for example, a motorcycle or a three-wheeled vehicle with one or two front wheels.
  • the lean vehicle may have, as a drive source, at least one of an electric motor that generates a drive force that is transmitted to a crankshaft, and an electric motor that generates a drive force that is transmitted to a drive wheel without passing through a crankshaft.
  • An electric motor as a drive source does not include a starter motor that is used only to start the engine.
  • the engine may be provided with a fuel supply device that supplies fuel.
  • the fuel supply device may be arranged to supply fuel directly to the combustion chamber.
  • at least a part of the fuel supply device may be arranged in a hole formed in the rear side surface of the cylinder section, or in a hole formed in at least one end surface of the cylinder section in the cylinder axial direction.
  • the fuel supply device may also be arranged to supply fuel to the intake path.
  • the lean vehicle may or may not have a forced induction device that pressurizes air to supply the pressurized air to the combustion chamber.
  • the forced induction device may be a turbocharger, a mechanical supercharger, or an electric supercharger.
  • the turbocharger may be an electrically assisted turbocharger that can pressurize air using exhaust gas pressure and an electric motor, or a turbocharger that pressurizes air using exhaust gas pressure alone.
  • the turbine wheel of the turbocharger may be disposed, for example, downstream in the exhaust gas flow direction from a position where at least one EGR path exhaust end of the EGR path is connected in the exhaust path.
  • the turbine wheel of the turbocharger may be disposed upstream in the exhaust gas flow direction from a position where at least one EGR path exhaust end of the EGR path is connected in the exhaust path.
  • a lean vehicle may have a catalyst in the exhaust path that purifies exhaust gas.
  • the catalyst may be disposed, for example, in the exhaust path downstream in the exhaust gas flow direction from a position where at least one of the EGR paths is connected to an exhaust side end of the EGR path.
  • the words including, comprising, having and their derivatives are used herein to be intended to encompass additional items in addition to the listed items and equivalents thereof.
  • the terms mounted, connected, coupled, and supported are used in a broad sense. Specifically, they include not only direct mounting, connection, coupling, and support, but also indirect mounting, connection, coupling, and support.
  • connected and coupled are not limited to physical or mechanical connections/couplings. They also include direct or indirect electrical connections/couplings.
  • the lean vehicle of the present invention has an EGR path equipped with an EGR cooler, yet prevents the lean vehicle from becoming too large in the left-right direction.
  • the lean vehicle 1 has an engine 10.
  • the engine 10 has a cylinder section 11 that forms at least one combustion chamber 12.
  • the cylinder section 11 includes a cylinder body section 13 and a cylinder head section 14.
  • the cylinder body section 13 forms at least one cylinder hole 15.
  • the cylinder head section 14 is connected to the cylinder body section 13 and constitutes an end of the engine 10 in the direction of at least one cylinder axis Cy, which is the central axis of the at least one cylinder hole 15.
  • the engine 10 also has a crankshaft 16 that rotates around an axis Cl along the left-right direction of the vehicle.
  • the engine 10 also has a camshaft drive mechanism 17.
  • the lean vehicle 1 has an engine coolant path 40.
  • a portion of the engine coolant path 40 is formed inside the engine 10. Note that FIG. 1 shows only a portion of the engine coolant path 40 that is formed inside the cylinder body portion 13, and most of the engine coolant path 40 is not shown.
  • a coolant that is not a lubricating oil flows through the engine coolant path 40.
  • a thermostat 41 is provided in the engine coolant path 40.
  • the thermostat 41 is disposed inside the bifurcated main frame portion 3 when viewed in the axial direction (direction of axis P) of the head pipe 4.
  • FIG. 1 shows thermostats 41a to 41f, which are six examples of the arrangement of one thermostat 41 provided in the engine coolant path 40.
  • the lean vehicle 1 has an EGR path 50.
  • the EGR path 50 connects the intake path 20 and the exhaust path 30, and is configured to return a portion of the exhaust gas passing through the exhaust path 30 to the intake path 20.
  • the EGR path 50 includes an EGR cooler path 52 formed in an EGR cooler 51.
  • the EGR path 50 may be provided with an EGR valve (not shown) that adjusts the flow rate of the exhaust gas flowing through the EGR path 50.
  • the EGR cooler 51 is disposed inside the bifurcated main frame portion 3 as viewed in the axial direction (direction of the axis P) of the head pipe 4.
  • the lowest end of the EGR cooler path 52 is located above the lowest end of at least one EGR path exhaust side end 50a connected to the exhaust path 30 in the EGR path 50.
  • the number of at least one EGR path exhaust side end 50a that the EGR path 50 has is one, but it may be multiple.
  • the entire EGR path 50 is positioned above a first plane S1 that passes through the top end of the cylinder body portion 13, which is positioned so that the upper part of at least one cylinder axis Cy is located forward in the vehicle longitudinal direction relative to the lower part, and is perpendicular to at least one cylinder axis Cy.
  • the EGR cooler path 52 and the thermostat 41 are arranged such that (i) at least condensed water generated in the EGR cooler path 52 returns to the exhaust path 30, and (ii) the upper part of at least one cylinder axis Cy is located forward of the lower part and the lowest end of the rear side surface 11b forming a part of the intake path 20 is located above the lowest end of the front side surface 11f forming a part of the exhaust path 30, and among the four side surfaces 11f, 11b, 11r, and 11l of the cylinder portion 11, the right side surface 11r closest to the camshaft drive mechanism 17 is arranged so that condensed water generated in at least the EGR cooler path 52 returns to the exhaust path 30.
  • any two of the three side surfaces excluding the left side surface 11l are arranged so that the side surface closest to the EGR cooler path 52 and the side surface closest to the thermostat 41 are respectively located above a second plane S2 passing through the bottom end of the cylinder section 11 and perpendicular to at least one cylinder axis Cy, below a third plane S3 passing through the top end of the cylinder section 11 and perpendicular to at least one cylinder axis Cy, and inside the bifurcated main frame section 3 as viewed in the axial direction of the head pipe 4 (direction of the axis P).
  • the following pattern A, pattern B, and pattern C are available as combinations of the positions of the EGR cooler path 52 and the thermostat 41 in this embodiment.
  • the EGR cooler path 52 is disposed such that the rear side surface 11b of the cylinder portion 11 is the side surface closest to the EGR cooler path 52.
  • the position of the EGR cooler path 52 in pattern A is not limited to the position of the EGR cooler path 52 shown in FIG.
  • the thermostat 41 is arranged so that the side surface of the right side surface 11r or the left side surface 11l of the cylinder portion 11 that is closer to the camshaft drive mechanism 17 is the side surface closest to the thermostat 41, for example, as in the thermostat 41a and thermostat 41b shown in FIG. 1.
  • the thermostat 41 is arranged so that the front side surface 11f of the cylinder portion 11 is the side surface closest to the thermostat 41, for example, as in the thermostat 41c and thermostat 41d shown in FIG. 1.
  • the thermostat 41a is shown by a solid line, and the thermostats 41b, 41c, and 41d are shown by two-dot chain lines.
  • the thermostat 41a is directly attached to the cylinder portion 11, and the thermostats 41b, 41c, and 41d are connected to the cylinder portion 11 via cooling liquid piping (not shown).
  • the position of the thermostat 41 in pattern A is not limited to the positions of the thermostats 41a, 41b, 41c, and 41d shown in FIG.
  • the EGR cooler path 52 is disposed such that one of the right side surface 11r and the left side surface 11l of the cylinder portion 11 that is different from the right side surface 11r or the left side surface 11l that is closer to the camshaft drive mechanism 17 is the side surface that is closest to the EGR cooler path 52.
  • the position of the EGR cooler path 52 in pattern B is not limited to the position of the EGR cooler path 52 shown in FIG.
  • the thermostat 41 is arranged so that the front side surface 11f of the cylinder portion 11 is the side closest to the thermostat 41, for example, as in the thermostat 41c and thermostat 41d shown in FIG. 1.
  • the thermostat 41 is arranged so that the rear side surface 11b of the cylinder portion 11 is the side closest to the thermostat 41, for example, as in the thermostat 41e and thermostat 41f shown in FIG. 1.
  • the thermostat 41e is shown by a solid line
  • the thermostats 41c, 41d, and 41f are shown by two-dot chain lines.
  • the thermostats 41c, 41d, 41e, and 41f are connected to the cylinder portion 11 via cooling liquid piping (not shown).
  • the position of the thermostat 41 in pattern B is not limited to the positions of the thermostats 41c, 41d, 41e, and 41f shown in FIG. 1.
  • the EGR cooler path 52 is disposed such that the front side surface 11f of the cylinder portion 11 is the side surface closest to the EGR cooler path 52.
  • the position of the EGR cooler path 52 in pattern C is not limited to the position of the EGR cooler path 52 shown in FIG.
  • the thermostat 41 is arranged so that the side surface of the right side surface 11r or the left side surface 11l of the cylinder portion 11 that is closer to the camshaft drive mechanism 17 is the side surface closest to the thermostat 41, for example, as in the thermostat 41a and thermostat 41b shown in FIG. 1.
  • the thermostat 41 is arranged so that the rear side surface 11b of the cylinder portion 11 is the side surface closest to the thermostat 41, for example, as in the thermostat 41e and thermostat 41f shown in FIG. 1.
  • the thermostat 41a is shown by a solid line, and the thermostats 41b, 41c, and 41d are shown by two-dot chain lines.
  • the thermostat 41a is directly attached to the cylinder portion 11, and the thermostats 41b, 41e, and 41f are connected to the cylinder portion 11 via cooling liquid piping (not shown).
  • the position of the thermostat 41 in pattern C is not limited to the positions of the thermostats 41a, 41b, 41e, and 41f shown in FIG.
  • the thermostat 41 when the thermostat 41 is connected to the cylinder portion 11 via a coolant pipe (not shown), the thermostat 41 may be connected to the cylinder head portion 14, may be connected to the cylinder body portion 13, or may be connected to both the cylinder head portion 14 and the cylinder body portion 13.
  • the thermostat 41a is attached directly to the left side of the cylinder head 14.
  • the thermostat 41 may be attached directly to the right side or the left side of the cylinder body 13.
  • the thermostat 41 may be attached directly to the cylinder body 13 or the cylinder head 14.
  • the thermostat 41 may be arranged inside the cylinder 11 without being exposed to the outside.
  • thermostats 41a, 41c, and 41e are located above the first plane S1
  • thermostats 41b, 41d, and 41f are located below the first plane S1.
  • the thermostat 41 may be positioned so as to intersect with the first plane S1.
  • the camshaft drive mechanism 17 is arranged in the space to the right of the center of the lean vehicle 1 in the left-right direction, and the thermostats 41c, 41d, 41e, and 41f, which are arranged so that the front side 11f or the rear side 11b of the cylinder section 11 is the closest side, are arranged in the space to the left of the center of the lean vehicle 1 in the left-right direction.
  • the thermostat 41 when the thermostat 41 is positioned so that the front side 11f or the rear side 11b of the cylinder portion 11 is the side closest to the thermostat 41, the thermostat 41 may be positioned at a position passing through the center of the lean vehicle 1 in the left-right direction, or may be positioned in the space to the right or left of the center of the lean vehicle 1 in the left-right direction where the camshaft drive mechanism 17 is positioned.
  • the entire EGR path 50 including the EGR cooler path 52 is disposed above the first plane S1 and below the third plane S3.
  • a portion of the EGR path 50 may be disposed above the third plane S3.
  • the EGR cooler path 52 in patterns A to C is arranged to face the first cylinder head side surface of the cylinder head portion 14 in a direction perpendicular to at least one cylinder axis Cy, so that the first cylinder head side surface, which is one of the three side surfaces of the cylinder head portion 14 excluding the right side surface or the left side surface close to the camshaft drive mechanism 17, is the side surface closest to the EGR cooler path 52.
  • the EGR cooler path 52 in the patterns A to C may be disposed at a position close to the first cylinder head side surface inside the cylinder head portion 14 so that a first cylinder head side surface, which is any one of three side surfaces of the cylinder head portion 14 except for the right side surface or the left side surface close to the camshaft drive mechanism 17, is the side surface closest to the EGR cooler path 52.
  • a first cylinder head side surface which is any one of three side surfaces of the cylinder head portion 14 except for the right side surface or the left side surface close to the camshaft drive mechanism 17 is the side surface closest to the EGR cooler path 52.
  • the EGR cooler path 52 may be disposed inside the cylinder head portion 14 so that a side surface other than the right side surface 11r or the left side surface 11l of the cylinder portion 11, which is the side surface closest to the EGR cooler path 52, among the right side surface 11r and the left side surface 11l close to the camshaft drive mechanism 17, is the side surface closest to the EGR cooler path 52.
  • the EGR path 50 is connected to the exhaust path 30 inside the cylinder head portion 14, but may be connected to the exhaust path 30 outside the cylinder head portion 14.
  • the EGR cooler path 52 may be positioned inside the cylinder head portion 14 so that the front side 11f or the rear side 11b of the cylinder portion 11 is the side closest to the EGR cooler path 52.
  • At least one EGR path exhaust end 50a of the EGR path 50 is connected to the exhaust path 30 outside the cylinder head portion 14, but may be connected to the exhaust path 30 inside the cylinder head portion 14.
  • the EGR path 50 is connected to the intake path 20 outside the cylinder head portion 14, but may be connected to the intake path 20 inside the cylinder head portion 14.
  • FIG. 3 is a side view of the lean vehicle 1, but the main frame portion 3 is shown in a cross-sectional view cut along a plane passing through the center of the lean vehicle 1 in the vehicle transverse direction.
  • the lean vehicle 1 of the second embodiment has a turbocharger 61.
  • the turbocharger 61 may be an electrically assisted turbocharger that can pressurize air using exhaust gas pressure and an electric motor.
  • a portion of the intake path 20 is formed inside the turbocharger 61.
  • a portion of the exhaust path 30 is formed inside the turbocharger 61.
  • An intercooler 62 that cools the air pressurized by the turbocharger 61 is provided in the intake path 20.
  • the turbocharger 61 and the intercooler 62 are disposed forward of at least one cylinder axis Cy in the vehicle longitudinal direction.
  • a portion of the intake path 20 downstream of the intercooler 62 is disposed above the engine 10 in the vehicle vertical direction.
  • a throttle valve 63 is disposed in the intake path 20 to adjust the amount of air supplied to at least one combustion chamber 12.
  • the throttle valve 63 is disposed downstream of the intercooler 62 in the air flow direction.
  • the intake path 20 is also provided with a first pressure sensor 64 and a second pressure sensor 65 to detect the pressure of the air in the intake path 20.
  • the first pressure sensor 64 is disposed downstream of the throttle valve 63 in the air flow direction.
  • the second pressure sensor 65 is disposed upstream of the throttle valve 63 and downstream of the intercooler 62 in the air flow direction.
  • a control device (not shown) provided in the lean vehicle 1 may detect the pressure difference between the air upstream of the throttle valve 63 and the air downstream of the throttle valve 63 based on the signals of the two pressure sensors 64, 65.
  • the control device may estimate the amount of air supplied to at least one combustion chamber 12 from this pressure difference.
  • the second pressure sensor 65 may be configured to detect temperature in addition to pressure.
  • the throttle valve 63, the first pressure sensor 64, and the second pressure sensor 65 are disposed above the engine 10 in the vehicle vertical direction. When the lean vehicle 1 is viewed in the vehicle left-right direction, a portion of the intake path 20 downstream of the intercooler 62 overlaps with the main frame portion 3. This portion of the intake path 20 is disposed inside the bifurcated main frame portion 3.
  • the above-described layout of the turbocharger 61 and the portion of the intake path 20 downstream of the intercooler 62 in the second embodiment may be applied to a lean vehicle having a turbocharger that is not included in the lean vehicle of the present invention.
  • it may be applied to a lean vehicle that does not have an EGR path.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

Un trajet RGE entier (50) comprenant un trajet de refroidisseur RGE (52) dudit véhicule inclinable (1) est situé au-dessus de l'extrémité supérieure d'une partie corps de cylindre (13) située de telle sorte qu'une partie supérieure de l'axe de cylindre (Cy) est positionnée davantage vers l'avant qu'une partie inférieure. Un thermostat (41) présent dans le trajet de refroidisseur de RGE et un trajet de liquide de refroidissement de moteur (40) est situé à l'intérieur d'une partie de cadre principal bifurquée (3) lorsqu'il est vu dans la direction axiale d'un tuyau de tête (4) et au-dessus de l'extrémité la plus basse de la partie de cylindre et au-dessous de l'extrémité supérieure de la partie de cylindre de telle sorte que l'eau condensée générée dans le trajet de refroidisseur de RGE retourne vers un trajet d'échappement, et de telle sorte que deux surfaces latérales quelconques parmi trois surfaces latérales excluant une surface latérale droite (11r) ou une surface latérale gauche (11l) proche d'un mécanisme d'entraînement d'arbre à cames (17) d'une partie de cylindre (11) agencée de telle sorte que l'extrémité la plus basse d'une surface arrière (11b) formant une partie d'un trajet d'admission (20) est positionnée au-dessus de l'extrémité la plus basse d'une surface avant (11f) formant une partie du trajet d'échappement (30) sont les surfaces latérales les plus proches.
PCT/JP2023/039345 2023-10-31 2023-10-31 Véhicule inclinable Pending WO2025094294A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/JP2023/039345 WO2025094294A1 (fr) 2023-10-31 2023-10-31 Véhicule inclinable
PCT/JP2024/038874 WO2025095053A1 (fr) 2023-10-31 2024-10-31 Véhicule à selle
PCT/JP2024/038861 WO2025095050A1 (fr) 2023-10-31 2024-10-31 Véhicule inclinable
PCT/JP2024/038879 WO2025095056A1 (fr) 2023-10-31 2024-10-31 Véhicule à selle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2023/039345 WO2025094294A1 (fr) 2023-10-31 2023-10-31 Véhicule inclinable

Publications (1)

Publication Number Publication Date
WO2025094294A1 true WO2025094294A1 (fr) 2025-05-08

Family

ID=95582513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/039345 Pending WO2025094294A1 (fr) 2023-10-31 2023-10-31 Véhicule inclinable

Country Status (1)

Country Link
WO (1) WO2025094294A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1016852A (ja) * 1996-07-03 1998-01-20 Honda Motor Co Ltd エンジン冷却装置
EP1676994A1 (fr) * 2004-12-30 2006-07-05 Kwang Yang Motor Co., Ltd. Dispositif de recyclage des gaz d'échappement pour moteur à combustion interne d'un motocycle
JP2012193624A (ja) * 2011-03-15 2012-10-11 Honda Motor Co Ltd 内燃機関のｅｇｒ装置
JP2018017175A (ja) * 2016-07-28 2018-02-01 川崎重工業株式会社 鞍乗型車両
WO2018163046A1 (fr) * 2017-03-06 2018-09-13 Tvs Motor Company Limited Système de recirculation de gaz d'échappement
CN115263517A (zh) * 2022-08-10 2022-11-01 江门市大长江集团有限公司 一种发动机及摩托车

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1016852A (ja) * 1996-07-03 1998-01-20 Honda Motor Co Ltd エンジン冷却装置
EP1676994A1 (fr) * 2004-12-30 2006-07-05 Kwang Yang Motor Co., Ltd. Dispositif de recyclage des gaz d'échappement pour moteur à combustion interne d'un motocycle
JP2012193624A (ja) * 2011-03-15 2012-10-11 Honda Motor Co Ltd 内燃機関のｅｇｒ装置
JP2018017175A (ja) * 2016-07-28 2018-02-01 川崎重工業株式会社 鞍乗型車両
WO2018163046A1 (fr) * 2017-03-06 2018-09-13 Tvs Motor Company Limited Système de recirculation de gaz d'échappement
CN115263517A (zh) * 2022-08-10 2022-11-01 江门市大长江集团有限公司 一种发动机及摩托车

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