WO2019092744A1 - Système d'échappement - Google Patents

Système d'échappement Download PDF

Info

Publication number
WO2019092744A1
WO2019092744A1 PCT/IN2018/050724 IN2018050724W WO2019092744A1 WO 2019092744 A1 WO2019092744 A1 WO 2019092744A1 IN 2018050724 W IN2018050724 W IN 2018050724W WO 2019092744 A1 WO2019092744 A1 WO 2019092744A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust
shield
exhaust pipe
internal combustion
combustion engine
Prior art date
Application number
PCT/IN2018/050724
Other languages
English (en)
Inventor
Sandeep Kumar BAWASKAR
Pankaj TURKAR
Original Assignee
Hero MotoCorp Limited
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 Hero MotoCorp Limited filed Critical Hero MotoCorp Limited
Publication of WO2019092744A1 publication Critical patent/WO2019092744A1/fr

Links

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
    • F01N13/14—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 having thermal insulation
    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N13/14—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 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • 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
    • F01N13/16—Selection of particular materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • 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 invention relates to an internal combustion engine and, more particularly, relates to exhaust system of the internal combustion engine of a vehicle.
  • An exhaust system of an internal combustion engine of a saddle type vehicle where a catalyst device is mounted on the downstream side of the exhaust port of the internal combustion engine.
  • the catalyst device is disposed in the exhaust path at a distance from the exhaust port of the internal combustion engine.
  • the exhaust pipe portion between the exhaust port of the engine and the catalyst device is directly exposed to the outside atmosphere there is a loss of heat from the exhaust gases.
  • the temperature of the exhaust gases received at catalyst device may not be enough for efficient performance of the catalytic conversion.
  • the exhaust pipe extends horizontally from the exhaust port of the engine and then is bent to form a substantial vertical section, the catalyst device is disposed in the vertical section of the exhaust pipe.
  • a double structured exhaust pipe having an inner pipe and an outer pipe surrounding the inner pipe to avoid heat losses from the exhaust pipe are known. Since, the exhaust pipe has a bent portion after the exhaust port of the internal combustion engine, the double structured exhaust pipe is to be provided with a bend, the outer surface of the double structured exhaust pipe forms wrinkles around the inner circle of the bent portion of the exhaust pipe which is not desirable. To address this, sometimes, the pipe is bent with a bigger bend radius, however, such bent pipe having bigger radius requires more curved portion along the length of the pipe and hence has lesser straight portion along the vertical direction to accommodate a catalyst. Similarly, bigger diameter of the outer pipe than the diameter of inner exhaust pipe resulting in more wrinkles around the inner circle of the bent portion.
  • an internal combustion engine comprising an exhaust port and an exhaust system, wherein exhaust system comprises an exhaust pipe, a catalyst device, a muffler and an exhaust shield.
  • the internal combustion engine (8) comprises a crankcase (04), a cylinder block (06) coupled to an upper portion of the front end of the crankcase (04) and projecting upwardly and forwardly therefrom.
  • the exhaust pipe comprises a first exhaust pipe having a first exhaust pipe upstream end and a first exhaust pipe downstream end, wherein the first exhaust pipe upstream end is operatively coupled to the exhaust port and a second exhaust pipe having a second exhaust pipe upstream end and a second exhaust pipe downstream end.
  • the catalyst device having a catalyst device upstream end and catalyst device downstream end, wherein the catalyst device upstream end coupled to the first exhaust pipe downstream end and the catalyst device downstream end coupled to the second exhaust pipe upstream end.
  • the muffler coupled to the second exhaust pipe downstream end.
  • the exhaust shield is configured to shield the catalyst device and at least a portion of the first exhaust pipe, wherein the exhaust shield comprises a plurality of exhaust shield elements. This enables easy manufacturing of the tubular exhaust shield that covers the catalyst device and the exhaust pipe. Since, the diameter of the catalyst device is different than the exhaust pipe, the manufacturing of the tubular exhaust shield with a single pipe is otherwise cumbersome.
  • the plurality of exhaust shield elements are manufactured by stamping process and are coupled together along the longitudinal edges to form a tube shaped exhaust shield.
  • the tubular structure surround the catalyst device and at least portion of the exhaust pipe so as to reduce the heat loss of the exhaust gases.
  • the first exhaust pipe has a curved portion between the first exhaust pipe upstream end and the first exhaust pipe downstream end.
  • the plurality of exhaust shield elements comprise a curved portion configured to shield a curved portion of the first exhaust pipe.
  • the plurality of exhaust shield elements are manufactured by forming or pressing method to attain the curved shape.
  • the exhaust shield, formed by coupling these plurality of exhaust shield elements, has a curved portion without any wrinkles around the curved portion of the exhaust shield.
  • the plurality of exhaust shield elements are semi cylindrical in shape.
  • the exhaust shield has a variable diameter along the length of the exhaust shield so as to conform the portion of the exhaust system which is shielded by the exhaust shield.
  • the exhaust shield comprises of a shield upstream end and a shield downstream end, wherein the shield upstream end of the exhaust shield is welded to the outer surface of the first exhaust pipe and the shield downstream end of the exhaust shield is welded to the second exhaust pipe.
  • Figure 02 illustrates a view of an exhaust system of an internal combustion engine of the vehicle according to an embodiment of the invention
  • Figure 03 illustrates an exploded view of a portion of the exhaust system of the internal combustion engine of the vehicle according to an embodiment of the invention.
  • Figure 04 illustrates sectional view of a portion of the exhaust system of the internal combustion engine of the vehicle according to an embodiment of the invention.
  • a vehicle (100) according to an embodiment of the present invention is depicted.
  • the vehicle (100) referred to herein, embodies a motorcycle.
  • the vehicle (100) may embody any other ridden vehicles such as scooters, three-wheeled vehicle, all-terrain vehicles (ATV) etc. without limiting the scope of the invention.
  • scooters three-wheeled vehicle
  • ATV all-terrain vehicles
  • FIG. 01 is a side view of a two-wheeled vehicle (100) which incorporates an internal combustion engine, according to an embodiment of the present invention.
  • the two wheeled vehicle (100) comprises, inter-alia, a front fork (112), head pipe (207), a front fender (106), a front wheel (108), a headlight (110), a steering handle bar (132), a fuel tank (102), an internal combustion engine (02), exhaust system (300), a rear suspension (118), a rear wheel (126), a rear fender (128), a tail light (130), and a seat (104).
  • the front fork (112) is rotatably attached to the head pipe (207) enabling free steering.
  • the front fork (112) supports a front wheel (108) at lower end thereof and a steering handle bar (132) at upper end thereof.
  • a fuel tank (102) storing fuel is mounted on a two wheeled vehicle (100) at a position upper than the internal combustion engine (02).
  • the rear wheel (126) is covered from above by a rear fender (128) which is mounted onto the rear end portion of seat member (104).
  • the rear wheel suspension section includes a swing arm (not shown) supporting a rear wheel (126) and at least one rear suspension (118) attached between the swing arm and the seat rail member (104).
  • a tail lamp assembly (130) is mounted on the rear fender (128).
  • the internal combustion engine (02) is mounted on the two-wheeled vehicle (100).
  • the internal combustion engine (02) is disposed in a space below the fuel tank (102) and behind the front fork (112).
  • a transmission (not shown) is arranged behind the internal combustion engine (02) to transmit the power output from the internal combustion engine (02) to the rear wheel (126) via a transmission means.
  • the internal combustion engine (02) is comprising of a crankcase (04), a cylinder block (06) coupled to an upper portion of the front end of the crankcase (04) and projecting upwardly and forwardly therefrom, and a cylinder head (08) coupled to an upper end of the cylinder block (06).
  • the cylinder head (08) has a combustion chamber faced by top surface of the piston, an intake port (40) communicating with the combustion chamber and opening at a first surface of the cylinder head (08), and an exhaust port (42) communicating with the combustion chamber and opening at a second surface of the cylinder head (08).
  • the exhaust system (300) is coupled to the exhaust port (42) of the internal combustion engine (02).
  • the exhaust pipe (311) comprises of a first exhaust pipe (301) and a second exhaust pipe (304).
  • the first exhaust pipe (301) has a first exhaust pipe upstream end (301a) and a first exhaust pipe downstream end (301b).
  • the catalyst device (305) has a catalyst device upstream end (305a) and catalyst device downstream end (305b).
  • the first exhaust pipe upstream end (301a) of the first exhaust pipe (301) is fluidicaly coupled to the exhaust port (42) of the internal combustion engine (02).
  • the first exhaust pipe (301) extends substantially horizontal from the exhaust port (42) forming a horizontal portion (301h) [refer Figure 02] of the first exhaust pipe (301); and thereafter the first exhaust pipe (301) bends downwards and extends substantially vertical along the front face of the internal combustion engine (02) forming vertical portion (301v) [refer Figure 02] of the first exhaust pipe (301).
  • the first exhaust pipe downstream end (301b) of the first exhaust pipe (301) is coupled to the catalyst device upstream end (305a) of the catalyst device (305).
  • the first exhaust pipe (301) comprises of a curved portion between the first exhaust pipe upstream end (301a) and the first exhaust pipe downstream end (301b).
  • the second exhaust pipe (304) has a second exhaust pipe upstream end (304a) and a second exhaust pipe downstream end (304b).
  • the second exhaust pipe (304) is coupled to the catalyst device (305).
  • the second exhaust pipe (304) is coupled to the catalyst device (305) by joining the second exhaust pipe upstream end (304a) of the second exhaust pipe (304) to the catalyst device downstream end (305b) of the catalyst device (305).
  • the second exhaust pipe (304) then extends towards rear of the vehicle (100).
  • the second exhaust pipe downstream end (304b) of the second exhaust pipe (304) is coupled to the muffler (306) towards rear of the vehicle (100).
  • the catalyst device (305) is comprising of a honeycomb like structure inside it.
  • the catalyst device (305) is shown to comprise of two conical structures as a first conical structure (302a) and a second conical structure (302b).
  • the first conical structure (302a) is fixed to the first end of the catalyst device (305) and the second conical structure (302b) is fixed to the second end of the catalyst device (305).
  • the converging end of the first conical structure (302a) forms the catalyst device upstream (305a).
  • the converging end of the second conical structure (302b) forms the catalyst device downstream end (305b).
  • At least portion of the exhaust system (300) is surrounded by the exhaust shield (303).
  • the at least portion of the exhaust system (300) is comprising of at least portion of the first exhaust pipe (301) and the catalyst device (305).
  • This portion of the exhaust system (300) is surrounded by an exhaust shield (303), the at least portion of the first exhaust pipe (301) is a part of the horizontal portion (301h) of the first exhaust pipe (301), without limiting the scope of the invention.
  • the at least portion of the exhaust system (300) is comprising of the first exhaust pipe (301) and the catalyst device (305).
  • This portion of the exhaust system (300) is surrounded by an exhaust shield (303), without limiting the scope of the invention.
  • the at least portion of the exhaust system (300) comprises of the first exhaust pipe (301), the second exhaust pipe (304) and the catalyst device (305). This portion of the exhaust system (300) is surrounded by an exhaust shield (303), without limiting the scope of the invention.
  • the exhaust shield (303) is a tubular body that surround a portion of the exhaust pipe (311).
  • the exhaust shield (303) comprises of a plurality of shell like structures (313, 323, ... ).
  • the plurality of exhaust shield elements (313, 323) are coupled together to form the exhaust shield (303).
  • the plurality of the exhaust shield elements (313, 323) are welded together to form the exhaust shield (303).
  • the plurality of exhaust shield elements (313, 323) are coupled along the longitudinal edges so as to form a tubular structure of the exhaust shield (303).
  • the tubular structure of the exhaust shield (303) is formed such that it has variable diameter along its length so as to conform the outer surface of the portion of the exhaust system (300) which is shielded by the plurality of the exhaust shield elements (313, 323, ... ).
  • the plurality of exhaust shield elements (313, 323, ... ) will also be curved so as to confirm the curved portion of the exhaust system (300).
  • the first exhaust pipe (301) comprises of a curved profile between the first exhaust pipe upstream end (301a) and the first exhaust pipe downstream end (301b) and the catalyst device (305) is disposed aligning with the vertical portion of the first exhaust pipe (301).
  • the plurality of exhaust shield elements (313, 323, ... ) are also shaped so as to confirm the curved portion of the first exhaust pipe (301) and the catalyst device (305).
  • the exhaust shield (303) has a shield upstream end (303a) and a shield downstream end (303b), wherein the shield upstream end (303a) of the exhaust shield (303) is coupled to the first exhaust pipe (301) near to its first exhaust pipe upstream end (301a) and the shield downstream end (303b) of the exhaust shield (303) is coupled to the second exhaust pipe (304) near to its second exhaust pipe upstream end (304a).
  • the tubular structure of the exhaust shield (303) formed by joining plurality of exhaust shield elements (313, 323, ... ) provides a covering to the first exhaust pipe (301) and the catalyst device (305) to prevent loss of heat from the exhaust gases coming from exhaust port (42) and entering the catalyst device (305). Hence sufficient amount of heat will be available for the process of catalytic conversion and will eventually result in better purification of exhaust gases.
  • the tubular structure of the exhaust shield (303) formed by joining the plurality of exhaust shield elements (313, 323, ... ) provides a covering to the first exhaust pipe (301) and the catalyst device (305) so as to prevent heat losses of the exhaust gases coming from exhaust port (42).
  • the exhaust shield (303) will act as an insulator between the atmosphere and the exhaust gases in the first exhaust pipe (301) and excess heat in the first exhaust pipe (301) will not hurt the legs or any other body parts of the rider.
  • the exhaust shield elements (313, 323, ... ) are surrounding the first exhaust pipe (301) and the catalyst device (305), a cavity (310a) is formed in between the inner surface of the exhaust shield elements (313a, 313b) and the portion of the first exhaust pipe (301) and another cavity (310b) is formed in between the inner surface of the exhaust shield elements (313b, 323b, ... ) and the outer surface of the catalyst (305).
  • These cavities (310a, 310b) are filled with a heat insulator to further avoid heat losses to the atmosphere and also to protect legs of the rider from excess heat in the first exhaust pipe (301).
  • At least one of the plurality of exhaust shield elements (313, 323, ... .) is manufactured by stamping, pressing, or forming of a metal sheet / plate to form the curved shape, as shown in the Figure 03, confirming to the curved profile of the first exhaust pipe (301) between the first exhaust pipe upstream end (301a) and the first exhaust pipe downstream end (301b) and to the catalyst device (305), and the plurality of the exhaust shield elements (313, 323, ...) are joined together along the longitudinal edges to form a tube shaped exhaust shield (303) with the curved profile.
  • these exhaust shield (303) provide a curved profile with required radius while not resulting any wrinkles on the outer surface of the exhaust shield (303) and this exhaust shield (303) provides enough vertically straight portion to accommodate a catalyst device (305) inside the exhaust shield (303) without resulting any wrinkles on the outer surface of the exhaust shield (303).
  • the plurality of exhaust shield elements (313, 323, .7) are semi cylindrical in shape.
  • the plurality of exhaust shield elements (313, 323, ... .) are of suitable shape.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un système d'échappement (300) d'un moteur à combustion interne (8). Ledit système comprend un tuyau d'échappement (311), un dispositif catalyseur (305) et un silencieux (306), le tuyau d'échappement (311) comprenant un premier tuyau d'échappement (301) et un second tuyau d'échappement (304). Un écran d'échappement (303) est configuré pour protéger le dispositif catalyseur (305) et au moins une partie du premier tuyau d'échappement (301). L'écran d'échappement (303) comprend une pluralité d'éléments de protection contre les gaz d'échappement (313, 323) qui sont assemblés pour former un écran d'échappement tubulaire (303) autour d'une partie du système d'échappement (300).
PCT/IN2018/050724 2017-11-09 2018-11-08 Système d'échappement WO2019092744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201711040049 2017-11-09
IN201711040049 2017-11-09

Publications (1)

Publication Number Publication Date
WO2019092744A1 true WO2019092744A1 (fr) 2019-05-16

Family

ID=66439122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2018/050724 WO2019092744A1 (fr) 2017-11-09 2018-11-08 Système d'échappement

Country Status (1)

Country Link
WO (1) WO2019092744A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4230848A1 (fr) * 2022-02-16 2023-08-23 Yamaha Hatsudoki Kabushiki Kaisha Système d'échappement et véhicule à enfourcher équipé de celui-ci

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390494A (en) * 1993-04-27 1995-02-21 Ap Parts Manufacturing Company Pipe assembly for efficient light-off of catalytic converter
US6651425B2 (en) * 1999-04-01 2003-11-25 Metaldyne Tubular Products, Inc. Stamped exhausts manifold for vehicle engines
US8915071B2 (en) * 2010-02-12 2014-12-23 Yanmar Co., Ltd. Exhaust gas purifying device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390494A (en) * 1993-04-27 1995-02-21 Ap Parts Manufacturing Company Pipe assembly for efficient light-off of catalytic converter
US6651425B2 (en) * 1999-04-01 2003-11-25 Metaldyne Tubular Products, Inc. Stamped exhausts manifold for vehicle engines
US8915071B2 (en) * 2010-02-12 2014-12-23 Yanmar Co., Ltd. Exhaust gas purifying device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4230848A1 (fr) * 2022-02-16 2023-08-23 Yamaha Hatsudoki Kabushiki Kaisha Système d'échappement et véhicule à enfourcher équipé de celui-ci

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