EP3321486B1 - Straddled vehicle - Google Patents

Straddled vehicle Download PDF

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Publication number
EP3321486B1
EP3321486B1 EP17173068.2A EP17173068A EP3321486B1 EP 3321486 B1 EP3321486 B1 EP 3321486B1 EP 17173068 A EP17173068 A EP 17173068A EP 3321486 B1 EP3321486 B1 EP 3321486B1
Authority
EP
European Patent Office
Prior art keywords
pipe
expansion chamber
outer pipe
vehicle
view
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
EP17173068.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3321486A1 (en
Inventor
Jun Yuizono
Takeshi Terashima
Taisuke Tateishi
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
Publication of EP3321486A1 publication Critical patent/EP3321486A1/en
Application granted granted Critical
Publication of EP3321486B1 publication Critical patent/EP3321486B1/en
Active legal-status Critical Current
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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
    • F01N13/08—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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/04—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of an exhaust pipe, manifold or apparatus in relation to vehicle frame or particular vehicle parts
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/02—Tubes being perforated
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/18—Dimensional characteristics of gas chambers
    • 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 a straddled vehicle including a silencer.
  • a silencer (a muffler device) is provided in a motorcycle in order to reduce the exhaust sound caused by the discharge of an exhaust gas from an engine (see JP 9-13942 A , for example).
  • the muffler device (hereinafter referred to as the silencer) described in JP 9-13942 A includes a cylindrical main body.
  • first, third and second expansion chambers are provided in this order from the front towards the rear.
  • the exhaust gas discharged from the engine passes through an exhaust pipe and is led to the inside of the cylindrical main body from the front.
  • the exhaust gas flows along the exhaust pipe to the second expansion chamber at the rear, then makes a U-turn to be led to the first expansion chamber, and expands in the first expansion chamber.
  • the exhaust gas that has expanded in the first expansion chamber is led to the second expansion chamber by a first coupling pipe and expands in the second expansion chamber.
  • the exhaust gas that has expanded in the second expansion chamber is led to the third expansion chamber by a second coupling pipe and expands in the third expansion chamber.
  • the exhaust gas that has expanded in the third expansion chamber is discharged to the air through a tail pipe.
  • the silencer swings together with the swing of the engine.
  • the silencer deviates downward due to swing characteristics of the engine and a suspension.
  • this tendency is more sufficiently increased. Therefore, it is desired that a bank angle of the motorcycle is increased.
  • the silencer described in JP 9-13942 A is fixed to incline with respect to a vehicle main body such that a rear end is located at a position further upward than a front end.
  • the inventors of the present application have considered that it is possible to increase the bank angle of the motorcycle by allowing the silencer to incline.
  • the size of the motorcycle is increased in a width direction due to the overlap of the silencer with a portion projecting in the width direction of the vehicle main body.
  • an increase in dimension in the width direction is not desired. In this manner, an increase in bank angle and inhibition of an increase in dimension in the width direction are conflicting requirements.
  • a straddled vehicle includes a body frame, a unit swing type engine swingably attached to the body frame, a swingarm swingably provided at the engine, a drive wheel rotated by motive power of the engine, an exhaust pipe connected to a cylinder head of the engine, and a silencer that is connected to the exhaust pipe and has an expansion chamber inside
  • the engine includes a crankcase that is configured to store a crankshaft and a belt case that is configured to store a transmission mechanism, an oil storage that is configured to store oil is formed in a lower portion in the crankcase, a light-transmitting window portion through which a height of a liquid surface of the oil stored in the oil storage is viewable is provided at an outer surface of the crankcase
  • the exhaust pipe is configured to overlap with the crankcase in a vehicle side view, the window portion is arranged at a position further downward than the exhaust pipe
  • the silencer includes an outer pipe, a separator that is arranged in the outer pipe and is configured to section the expansion chamber into an upstream expansion
  • the unit swing type engine is swingably attached to the body frame. Further, the swingarm is swingablly provided at the engine.
  • the drive wheel is supported between the belt case of the engine and the swingarm.
  • the swingarm is located between the outer pipe of the silencer and the drive wheel in the vehicle plan view. The drive wheel is rotated by motive power of the engine.
  • the cylinder head of the engine and the silencer are connected to each other by the exhaust pipe.
  • the expansion chamber in the outer pipe is sectioned into the upstream expansion chamber and the downstream expansion chamber by the separator.
  • the upstream expansion chamber is located at a position further rearward than the downstream expansion chamber in the vehicle side view.
  • the exhaust pipe passes through the downstream expansion chamber, penetrates the separator and extends to the upstream expansion chamber.
  • the first inner pipe penetrates the separator.
  • the second inner pipe penetrates the separator from the downstream expansion chamber in the outer pipe, passes through the upstream expansion chamber and projects from the rear end of the outer pipe.
  • the exhaust gas from the engine is led to the upstream expansion chamber in the outer pipe through the exhaust pipe and expands in the upstream expansion chamber.
  • the exhaust gas that has expanded in the upstream expansion chamber is led to the downstream expansion chamber through the first inner pipe and expands in the downstream expansion chamber.
  • the exhaust gas that has expanded in the downstream expansion chamber passes through the second inner pipe and is discharged to the outside from the rear end of the outer pipe.
  • the first inner pipe is arranged at a position further upward or further downward than the exhaust pipe in the vehicle side view, and the second inner pipe is arranged to be opposite to the first pipe with the exhaust pipe sandwiched therebetween in the vehicle side view. Due to such arrangement, a dimension of the outer pipe in the width direction can be reduced to be sufficiently smaller than a dimension in the top-and-bottom direction. Therefore, even in the configuration in which the outer pipe overlaps with the swingarm due to the inclination of the outer pipe with the rear end of the outer pipe located at a position higher than the front end, an increase in dimension of the straddled vehicle including the silencer in the width direction is inhibited. As a result, the bank angle of the straddled vehicle can be increased, and an increase in dimension of the straddled vehicle in the width direction can be inhibited.
  • the outer pipe overlaps with the swingarm, inclines such that the rear end of the outer pipe is located at a position higher than the front end, and inclines to pass through a position further upward than the axle of the drive wheel. Therefore, the outer pipe does not overlap with the axle of the drive wheel in the vehicle side view.
  • the rider can easily perform the daily inspection for checking a state of the axle of the drive wheel from the side surface of the vehicle.
  • the window portion can be arranged at a position further downward than the exhaust pipe not to overlap with the exhaust pipe.
  • the rider can check a remaining amount of the oil by viewing a height of a liquid surface of the oil through the window portion.
  • the crankcase is configured to enable the attachment of a bar-shape oil level gauge to the crankcase.
  • the space can be effectively utilized.
  • the straddled vehicle may further include a storage box provided at a position further upward than the engine, wherein an oil filling port through which the oil storage is filled with oil may be formed at the crankcase, and the oil filling port may be arranged to overlap with the storage box in the vehicle plan view.
  • the size of the storage box provided at a position further upward than the engine can be increased.
  • a rear portion of the second inner pipe may be curved in the vehicle plan view such that a rear end opening of the second inner pipe is directed obliquely outward.
  • Inclination of a center axis of the rear portion of the second inner pipe with respect to the vehicle front-and-rear direction may be 30 degrees or less in the vehicle plan view.
  • an exhaust gas can be prevented from being discharged sideward from the second inner pipe of the silencer.
  • a catalytic converter may be provided inside of the outer pipe.
  • the exhaust gas discharged from the outer pipe can be cleaned.
  • the catalytic converter is provided in the outer pipe located at the downstream of the exhaust pipe, thereby not coming into contact with an excessively high temperature exhaust gas.
  • the catalytic converter can be prevented from melting.
  • the outer pipe may be oblong or elliptical in a cross section orthogonal to a direction in which the outer pipe extends.
  • the outer pipe can be easily manufactured while a dimension of the outer pipe in the width direction is reduced to be smaller than a dimension of the outer pipe in the top-and-down direction.
  • the second inner pipe may be arranged at a position further upward than a center of the outer pipe in the top-and-bottom direction. In this case, an entrance of foreign objects stirred up from the ground surface due to the travel of the straddled vehicle into the outer pipe from the second inner pipe can be prevented.
  • the second inner pipe may be arranged at a position further upward than the first inner pipe.
  • the second inner pipe can be easily arranged at a position further upward than the center of the outer pipe in the top-and-bottom direction.
  • An inner diameter of the exhaust pipe, in the outer pipe may be larger than an inner diameter of the first inner pipe and an inner diameter of the second inner pipe. In this case, an increase in size of the outer pipe in the top-and-bottom direction can be prevented.
  • An inner diameter of the second inner pipe may be smaller than an inner diameter of the first inner pipe.
  • the exhaust pipe may have a first portion having a first inner diameter and a second portion having a second diameter, the first portion of the exhaust pipe may be connected to an exhaust port of the cylinder head, the second portion of the exhaust pipe may penetrate the separator from the upstream expansion chamber, may pass through the downstream expansion chamber and may project from a front portion of the outer pipe by a predetermined distance, and the second inner diameter may be larger than the first inner diameter.
  • the strength of the second portion of the exhaust pipe can be improved.
  • the outer pipe can be firmly supported by the second portion of the exhaust pipe.
  • An upper end at a rear end of the silencer may be located at a position further upward than an upper end of a head cover of the cylinder head. In this case, because the rear end of the silencer inclines sufficiently upward, the bank angle of the straddled vehicle can be more sufficiently increased. Further, the exhaust path for the exhaust gas can be more sufficiently lengthened.
  • a lower end of the silencer may be located at a position further upward than a lower end of the crankcase and further rearward than a rear end of the crankcase in the vehicle side view. In this case, because the silencer is located sufficiently upwardly, the bank angle of the straddled vehicle can be more sufficiently increased.
  • a lower end of the exhaust pipe may be located at a position further upward than a lower end of the crankcase in the vehicle side view. In this case, because the exhaust pipe is located sufficiently upwardly, the bank angle of the straddled vehicle can be more sufficiently increased.
  • a straddle vehicle according to one embodiment will be described below with reference to the drawings.
  • a motorcycle will be described as one example of the straddled vehicle.
  • an upstream position and a downstream position are defined with reference to a flow of an exhaust gas.
  • Fig. 1 is a schematic side view showing a schematic configuration of the motorcycle according to the one embodiment.
  • the motorcycle 100 includes a swingarm 1, a storage box 2, a seat 3, a body frame 10 ( Fig. 2 , described below), a unit swing type engine 30, an exhaust pipe 40, a silencer 50 and a rear wheel 60.
  • arrows suitably indicate a front-and-rear direction L, a width direction H and a top-and-bottom direction V of the motorcycle 100.
  • a direction in which an arrow is directed in the front-and-rear direction L is referred to as forward, and its opposite direction is referred to as rearward.
  • a direction in which an arrow is directed in the width direction H is referred to as leftward, and its opposite direction is referred to as rightward.
  • a direction in which an arrow is directed in the top-and-bottom direction V is referred to as upward, and its opposite direction is referred to as downward.
  • Fig. 2 is a diagram manly showing the body frame 10 of the motorcycle 100 of Fig. 1 .
  • dotted lines indicate the body frame 10.
  • the body frame 10 includes a main frame 11, a rear frame 12 and a head pipe 13.
  • the main frame 11 extends obliquely rearward and downward from the head pipe 13 and further extends substantially horizontally.
  • the rear frame 12 extends obliquely rearward and upward from a rear end of the main frame 11.
  • a steering shaft 21 is inserted into the head pipe 13 to be swingable in a left-and-right direction.
  • a handle 23 is attached to an upper end of the steering shaft 21.
  • a pair of fork pipes 22 is connected to the respective left and right of the steering shaft 21.
  • a front wheel 24 is rotatably supported between lower portions of the pair of fork pipes 22.
  • the unit swing type engine 30 is provided at a position further downward than the main frame 11 and the rear frame 12.
  • the storage box 2 (see Fig. 1 ) capable of storing personal belongings of a rider is provided at a position further upward than the engine 30.
  • the storage box 2 is supported by the main frame 11 and the rear frame 12.
  • the seat 3 is provided at a position further upward than the storage box 2.
  • the seat 3 is also used as a lid of the storage box 2.
  • Fig. 3 is a schematic enlarged plan view showing a schematic configuration of the engine 30 and its periphery.
  • Fig. 4 is a schematic plan view showing a schematic configuration of the motorcycle 100 of Fig. 1 .
  • one-dot and dash lines indicate portions except for the engine 30 and constituent elements of its periphery.
  • the engine 30 includes a cylinder unit 31 and a unit case 32.
  • the cylinder unit 31 is provided to extend obliquely forward and upward from a front portion of the unit case 32.
  • the cylinder unit 31 is constituted by a cylinder body 31a, a cylinder head 31b and a head cover 31c. At the cylinder head 31b, an exhaust port 31p is formed.
  • the unit case 32 has a configuration in which a crankcase 32a that stores a crankshaft and a belt case 32b that stores a transmission mechanism are integrally formed.
  • the belt case 32b extends rearward from a left portion of the crankcase 32a.
  • a thick two-dots and dash line indicates a boundary portion between the crankcase 32a and the belt case 32b.
  • the crankcase 32a is swingably supported by the rear frame 12 of Fig. 2 .
  • the swingarm 1 is provided to extend rearward from a right rear portion of the crankcase 32a.
  • the rear wheel 60 is rotatably held by a rear end of the belt case 32b and a rear end of the swingarm 1. The rear wheel 60 is rotated by a rotational force of the engine 30.
  • the silencer 50 is attached to a right side surface of the swingarm 1 while inclining to pass through a position further upward than an axle 61 of the rear wheel 60 including a coupling member such as a bolt.
  • a coupling member such as a bolt
  • the exhaust pipe 40 is constituted by an upstream pipe 41, a downstream pipe 42 and a tapered pipe 43.
  • An inner diameter of the downstream pipe 42 is larger than an inner diameter of the upstream pipe 41.
  • the tapered pipe 43 is formed in a tapered shape such that its inner diameter is gradually increased from an upstream position towards a downstream position.
  • the upstream pipe 41 is connected to the exhaust port 31p of the cylinder head 31b.
  • the downstream pipe 42 is attached to the silencer 50.
  • the tapered pipe 43 connects the upstream pipe 41 to the downstream pipe 42.
  • the exhaust pipe 40 is arranged to extend rearward while overlapping with the crankcase 32a in the vehicle side view. An exhaust gas from the exhaust port 31p is discharged to the outside through the exhaust pipe 40 and the silencer 50.
  • An oil storage 33 that stores oil is formed in a lower portion in the crankcase 32a. Further, an oil filling port 33a is formed at the crankcase 32a. The oil storage 33 can be filled with oil through the oil filling port 33a.
  • a light-transmitting window portion 33b is provided at an outer surface of the crankcase 32a to overlap with a liquid surface of the oil stored in the oil storage 33.
  • the window portion 33b can be arranged at a positon further downward than the exhaust pipe 40 not to overlap with the exhaust pipe 40.
  • the window portion 33b is arranged at a position further downward than the exhaust pipe 40 not to overlap with the exhaust pipe 40 in the vehicle side view. The rider can check a remaining amount of the oil by viewing a height of the liquid surface of the oil stored in the oil storage 33 through the window portion 33b.
  • crankcase 32a is configured to enable the attachment of a bar-shape oil level gauge for checking a remaining amount of the oil to the crankcase 32a. Further, it is not necessary to ensure a space for enabling the attachment and detachment of the oil level gauge in an upper portion of the crankcase 32a. Then, in a vehicle plan view, as shown in Fig. 4 , the oil filling port 33a is arranged to overlap with the storage box 2. Thus, the oil filling port 33a can be provided at the crankcase 32a while the storage box 2 is largely maintained.
  • Fig. 5 is a plan view of the silencer 50.
  • Fig. 6 is a partial longitudinal cross sectional view of the silencer 50 of Fig. 5 .
  • Fig. 7 is a rear end view of the silencer 50 of Fig. 5 .
  • Fig. 8 is a cross sectional view taken along the line A-A of the silencer 50 of Fig. 7 .
  • the silencer 50 includes an outer pipe 51, two inner pipes 52, 53, a separator 54 and a cover member 55.
  • the outer pipe 51 extends in the front-and-rear direction L in the vehicle plan view.
  • a front portion of the outer pipe 51 is closed by a bowl-shaped closing member 51a, and a rear portion of the outer pipe 51 is closed by a flat closing member 51b.
  • the outer pipe 51 is elliptical in a cross section orthogonal to a direction in which the outer pipe 51 extends (see Fig. 8 ).
  • An expansion chamber E is formed in the outer pipe 51.
  • the inner pipe 52 and the separator 54 are provided in the outer pipe 51. Further, part of the downstream pipe 42 of the exhaust pipe 40 and part of the inner pipe 53 are provided in the outer pipe 51.
  • the separator 54 is arranged to section the expansion chamber E in the outer pipe 51 into an upstream expansion chamber E1 and a downstream expansion chamber E2.
  • the upstream expansion chamber E1 is located at a position further rearward than the downstream expansion chamber E2 in the vehicle side view.
  • the downstream pipe 42 is arranged to penetrate the closing member 51a that closes the front portion of the outer pipe 51. In the outer pipe 51, the downstream pipe 42 passes through the downstream expansion chamber E2, penetrates the separator 54 and extends to the upstream expansion chamber E1. The downstream end of the downstream pipe 42 is closed.
  • a catalytic converter 56 for cleaning an exhaust gas is provided inside of the downstream pipe 42 in the outer pipe 51.
  • two catalytic converters 56 are arranged in the front-and-rear direction L.
  • a plurality of holes 42h that penetrate an inner peripheral surface and an outer peripheral surface are formed in the entire periphery.
  • the plurality of holes 42h are punched holes, for example.
  • a shape of each hole 42h is a circle.
  • the inner pipe 52 is arranged to penetrate the separator 54 and connect the upstream expansion chamber E1 to the downstream expansion chamber E2.
  • the inner pipe 53 is arranged to penetrate the separator 54 from the downstream expansion chamber E2 in the outer pipe 51, passes through the upstream expansion chamber E1 and projects from the closing member 51b at a rear portion of the outer pipe 51 (see Fig. 7 ).
  • a rear portion of the inner pipe 53 is curved such that a rear end opening of the inner pipe 53 is directed obliquely outward.
  • an inclination angle ⁇ of a center axis of a rear portion of the inner pipe 53 with respect to the front-and-rear direction L is preferably larger than 0 degree and 30 degrees or less.
  • the inner pipe 52 is arranged at a position further downward than the downstream pipe 42, and the inner pipe 53 is arranged at a position further upward than the downstream pipe 42 (see Fig. 8 ).
  • An inner diameter of the downstream pipe 42 is larger than an inner diameter of each of the inner pipes 52, 53.
  • the inner pipes 52, 53 can be easily arranged in the outer pipe 51 having an elliptical cross section.
  • the inner diameter of the inner pipe 53 is smaller than the inner diameter of the inner pipe 52.
  • the inner pipe 53 is arranged at a position further upward than a center of the outer pipe 51 in the top-and-bottom direction. In this case, an entrance of foreign objects stirred up from the ground surface due to the travel of the motorcycle 100 into the outer pipe 51 from the inner pipe 53 can be prevented.
  • An outer peripheral surface of the outer pipe 51 is covered by the cover member 55.
  • a sound absorbing member 57 such as glass wool is provided between an outer peripheral surface of the outer pipe 51 and the cover member 55.
  • a plurality of holes 51h that penetrate an inner peripheral surface and the outer peripheral surface are formed in an entire periphery. In Fig. 6 , only part of the holes 51h is drawn. The plurality of holes 51h are punched holes, for example. In the present embodiment, a shape of each hole 51h is a circle.
  • the attachment portion 55a is arranged at a front upper portion in an outer peripheral surface of the cover member 55.
  • the attachment portion 55b is arranged at a front lower portion in the outer peripheral surface of the cover member 55.
  • the attachment portion 55c is arranged in a rear lower portion in the outer peripheral surface of the cover member 55.
  • the outer pipe 51 is arranged to overlap with the swingarm 1 ( Fig. 2 ) in the vehicle side view.
  • the swingarm 1 is located between the outer pipe 51 and the rear wheel 60 ( Fig. 3 ).
  • the outer pipe 51 inclines such that a rear end is higher than a front end, and inclines to pass through a position further upward than the axle 61 of the rear wheel 60.
  • the attachment portions 55a to 55c of the cover member 55 are attached to the swingarm 1 by fixing members such as bolts.
  • the silencer 50 is fixed.
  • Fig. 9 is a diagram for explaining a detailed positional relationship between the exhaust pipe 40 and the silencer 50.
  • a position P1 at an upper end of a rear end of the silencer 50 is preferably arranged at a position further upward than a position P2 at an upper end of the head cover 31c of the cylinder head 31b.
  • the rear end of the silencer 50 inclines sufficiently upwardly, so that a bank angle of the motorcycle 100 can be more sufficiently increased. Further, an exhaust path for an exhaust gas can be more sufficiently lengthened.
  • a position P3 at a lower end of the silencer 50 is preferably arranged at a position further upward than a position P4 at a lower end of the crankcase 32a and further rearward than a position P5 at a rear end of the crankcase 32a.
  • the silencer 50 is located sufficiently upwardly, so that the bank angle of the motorcycle 100 can be more sufficiently increased.
  • a position P6 at a lower end of the exhaust pipe 40 is preferably arranged at a position further upward than the position P4 at the lower end of the crankcase 32a.
  • the exhaust pipe 40 is located sufficiently upwardly, the back angle of the motorcycle 100 can be more sufficiently increased.
  • the upstream pipe 41 of the exhaust pipe 40 extends downward from the exhaust port 31p and then extends to incline upward and rearward.
  • the position P6 at the lower end of the exhaust pipe 40 is equivalent to the position P6 at a lower end of the upstream pipe 41.
  • an exhaust gas discharged from the cylinder head 31b is led to a downstream position from an upstream position and through the exhaust pipe 40, and is cleaned by passing through the catalytic converter 56 provided in the downstream pipe 42.
  • the exhaust path is relatively short. Therefore, when being arranged at upstream of the exhaust path, the catalytic converter 56 is likely to melt by coming into contact with an excessively high temperature exhaust gas.
  • the catalytic converter 56 is provided in the downstream pipe 42 in the outer pipe 51 located at downstream of the exhaust path, thereby not coming into contact with an excessively high temperature exhaust gas. Thus, the catalytic converter 56 can be prevented from melting.
  • the exhaust gas that has passed through the catalytic converter 56 is led to the upstream expansion chamber E1 through the plurality of holes 42h of the downstream pipe 42 and expands in the upstream expansion chamber E1.
  • the exhaust gas that has expanded in the upstream expansion chamber E1 is led to the downstream expansion chamber E2 through the inner pipe 52 and expands in the downstream expansion chamber E2.
  • Part of the exhaust gas that has expanded in the downstream expansion chamber E2 is led to the sound absorbing member 57 through the plurality of holes 51h of the outer pipe 51, and the sound of the exhaust gas is absorbed by the sound absorbing member 57.
  • Another part of the exhaust gas that has expanded in the downstream expansion chamber E2 passes through the inner pipe 53 and is discharged to the outside from the rear end of the outer pipe 51.
  • the inner pipe 52 is arranged at a position further downward than the downstream pipe 42, and the inner pipe 53 is arranged at a position further upward than the downstream pipe 42.
  • This arrangement enables a dimension of the outer pipe 51 in the width direction to be sufficiently smaller than a dimension of the outer pipe 51 in the top-and-bottom direction. Therefore, even in the configuration in which the outer pipe 51 overlaps with the swingarm 1 due to the inclination of the outer pipe 51 with the rear end of the outer pipe 51 located at a position higher than the front end, an increase in dimension of the motorcycle 100 including the silencer 50 in the width direction H is inhibited. As a result, the bank angle of the motorcycle 100 can be increased, and an increase in dimension of the motorcycle 100 in the width direction H can be inhibited.
  • the rider sometimes prefers the design of the configuration in which the silencer 50 (the outer pipe 51) is arranged to incline. Therefore, the silencer 50 is provided at the swingarm 1 while inclining, so that the commercial value of the motorcycle 100 can be improved.
  • downstream pipe 42 projects from the closing member 51a at the front portion of the outer pipe 51 by a predetermined distance. Because the inner dimeter of the downstream pipe 42 is larger than the inner diameter of the upstream pipe 41, the strength of the downstream pipe 42 is larger than the strength of the upstream pipe 41. Therefore, even in the case where the outer pipe 51 is arranged to incline, it is possible to more firmly support the outer pipe 51 by arranging the downstream pipe 42 as described above.
  • the outer pipe 51 has an elliptical cross section in the above-mentioned embodiment, the present invention is not limited to this.
  • the outer pipe 51 may have an oblong cross section.
  • the outer pipe 51 may have a cross section in another shape.
  • the body frame 10 is an example of a body frame
  • the engine 30 is an example of an engine
  • the swingarm 1 is an example of a swingarm
  • the rear wheel 60 is an example of a drive wheel.
  • the cylinder head 31b is an example of a cylinder head
  • the exhaust pipe 40 is an example of an exhaust pipe
  • the expansion chamber E is an example of an expansion chamber
  • the upstream expansion chamber E1 is an example of an upstream expansion chamber
  • the downstream expansion chamber E2 is an example of a downstream expansion chamber.
  • the silencer 50 is an example of a silencer
  • the crankcase 32a is an example of a crankcase
  • the belt case 32b is an example of a belt case
  • the oil storage 33 is an example of an oil storage.
  • the window portion 33b is an example of a window portion
  • the outer pipe 51 is an example of an outer pipe
  • the separator 54 is an example of a separator
  • the inner pipe 52 is an example of an inner pipe and a first inner pipe
  • the inner pipe 53 is an example of an inner pipe and a second inner pipe.
  • the axle 61 is an example of an axle
  • the motorcycle 100 is an example of a straddled vehicle
  • the storage box 2 is an example of a storage box
  • the oil filling port 33a is an example of an oil filling port.
  • the catalytic converter 56 is an example of a catalytic converter
  • the upstream pipe 41 is an example of a first portion
  • the downstream pipe 42 is an example of a second portion
  • the exhaust port 31p is an example of an exhaust port
  • the head cover 31c is an example of a head cover.
  • the present invention can be effectively utilized for various types of straddled vehicles including silencers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Vehicle Body Suspensions (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
EP17173068.2A 2016-11-09 2017-05-26 Straddled vehicle Active EP3321486B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016219080A JP2018076821A (ja) 2016-11-09 2016-11-09 鞍乗り型車両

Publications (2)

Publication Number Publication Date
EP3321486A1 EP3321486A1 (en) 2018-05-16
EP3321486B1 true EP3321486B1 (en) 2019-03-13

Family

ID=58778968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17173068.2A Active EP3321486B1 (en) 2016-11-09 2017-05-26 Straddled vehicle

Country Status (3)

Country Link
EP (1) EP3321486B1 (pt)
JP (1) JP2018076821A (pt)
BR (1) BR102017011102B1 (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4174291A1 (en) * 2021-10-26 2023-05-03 Yamaha Hatsudoki Kabushiki Kaisha Scooter type vehicle

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7061020B2 (ja) * 2018-06-05 2022-04-27 カワサキモータース株式会社 鞍乗型車両の排気装置
JP7058572B2 (ja) * 2018-08-09 2022-04-22 本田技研工業株式会社 鞍乗型車両の触媒配置構造
JP7159779B2 (ja) * 2018-10-17 2022-10-25 スズキ株式会社 排気装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589517A (en) * 1983-11-30 1986-05-20 Saikei Giken Kogyo Kabushiki Kaisha Muffler
US4673058A (en) * 1986-05-09 1987-06-16 G Enterprises Limited High performance automotive muffler
JP3445875B2 (ja) 1995-06-30 2003-09-08 ヤマハ発動機株式会社 スクータ型車両用排気装置
JP4049379B2 (ja) * 2003-08-27 2008-02-20 本田技研工業株式会社 自動二輪車の排気制御装置
JP4924190B2 (ja) * 2007-05-08 2012-04-25 スズキ株式会社 スクーター型車両
JP2013230756A (ja) * 2012-04-27 2013-11-14 Yamaha Motor Co Ltd 鞍乗型車両

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4174291A1 (en) * 2021-10-26 2023-05-03 Yamaha Hatsudoki Kabushiki Kaisha Scooter type vehicle

Also Published As

Publication number Publication date
EP3321486A1 (en) 2018-05-16
BR102017011102A2 (pt) 2018-05-29
JP2018076821A (ja) 2018-05-17
BR102017011102B1 (pt) 2023-04-04

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