WO2020170381A1 - Silencer structure for saddled vehicle - Google Patents
Silencer structure for saddled vehicle Download PDFInfo
- Publication number
- WO2020170381A1 WO2020170381A1 PCT/JP2019/006501 JP2019006501W WO2020170381A1 WO 2020170381 A1 WO2020170381 A1 WO 2020170381A1 JP 2019006501 W JP2019006501 W JP 2019006501W WO 2020170381 A1 WO2020170381 A1 WO 2020170381A1
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- WO
- WIPO (PCT)
- Prior art keywords
- protrusion
- muffler
- silencer
- saddle
- longitudinal direction
- Prior art date
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Classifications
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- 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
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- 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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
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- 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 silencer structure for a saddle type vehicle.
- Patent Document 1 discloses a configuration in which a muffler for silencing exhaust gas from an internal combustion engine is arranged on the side of a rear wheel of a motorcycle.
- the muffler front part is provided with a first protector
- the muffler rear part is provided with a second protector narrower than the first protector. I have it.
- an object of the present invention is to provide a silencer structure for a saddle-ride type vehicle that can suppress the air resistance around the silencer that silences the exhaust of the engine and the influence on the exhaust.
- a first aspect of the present invention is a silencer structure for a saddle-ride type vehicle (1) including a silencer (42) for silencing exhaust gas discharged from an internal combustion engine (E).
- the muffler (42) is provided with a protrusion (71) that projects from the outer surface (43b) of the muffler and causes a predetermined turbulent flow in the traveling wind flowing along the outer surface (43b).
- the silencer (42) includes a silencer main body (43) and a cover member (51) attached to the silencer main body (43).
- the projection (71) is provided on at least one of the silencer body (43) and the cover member (51).
- the silencer body (43) is disposed at the rear end portion of the end cap (46) and the end cap (46) to discharge the exhaust gas.
- a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the protrusion (71) has a center of the silencer (42) in a longitudinal direction of the silencer (42). It is provided behind the position (ct1).
- the protrusion (71) has a protrusion longitudinal direction that faces the vehicle longitudinal direction, and a dimension in the protrusion longitudinal direction ( Y1) is larger than the dimension (X1, Z1) in the direction orthogonal to the protrusion longitudinal direction.
- the protrusion (71) has a chevron shape having a projecting top portion (Zt) in a side view orthogonal to the protrusion longitudinal direction, and the protrusion (71) is On the front side in the vehicle front-rear direction, there is a front-side inclined portion that rises from the front end portion of the protrusion toward the protruding top portion (Zt), and on the rear side in the vehicle front-rear direction of the protrusion (71), the protrusion from the protruding top portion (Zt). It has a rear sloped portion that decreases toward the rear end.
- the front sloped portion is longer than the rear sloped portion in the projection longitudinal direction.
- the rear inclined portion is longer in the protrusion longitudinal direction than the front inclined portion.
- a plurality of the protrusions (71) are arranged on the outer periphery of the silencer (42).
- the silencer (42) is provided on the silencer body (43) and on the outside of the silencer body (43).
- a cover member (51) to be attached, and the protrusion (71) is provided on the cover member (51).
- the outer surface of the muffler is provided with the protrusion that causes turbulence in the traveling wind flowing along the outer surface, the outer surface of the muffler is generated by the prescribed turbulent flow generated behind the protrusion.
- the effect of delaying the separation of traveling wind from is obtained. Therefore, it is possible to suppress the air resistance caused by the separation of the traveling wind immediately after the rear end of the silencer.
- the protrusion is provided on at least one of the muffler body and the muffler cover, it is possible to increase the degree of freedom in installing the protrusion and easily control the air flow according to the embodiment.
- At least one of the cover member and the end cap is a silencer structure of a type that extends rearward of the exhaust port and hides the exhaust port, improving the appearance and improving the appearance. It is possible to prevent the wind blown from the rear end of the cap from affecting the exhaust port.
- the protrusion since the protrusion is provided in the latter half portion of the silencer in the longitudinal direction, the turbulent flow of the traveling wind generated by the protrusion easily reaches the rear end position of the silencer, and the rear end of the silencer. It is possible to effectively suppress the inclusion of running wind at the position.
- the dimension of the protrusion in the direction orthogonal to the longitudinal direction of the protrusion is smaller than the dimension of the protrusion in the longitudinal direction of the vehicle. Therefore, the air resistance of the protrusion can be reduced. it can. Further, since the dimension of the protrusion in the longitudinal direction of the protrusion that faces the vehicle front-rear direction is large, the pressure change of the traveling wind can be moderated by using the length of the protrusion, and the generation of wind noise can be suppressed.
- the front portion of the protrusion has a front inclined portion that gradually increases, and the rear portion of the protrusion has a rear inclined portion that gradually decreases, so that the air resistance of the protrusion is further reduced.
- the pressure change of the traveling wind can be moderated.
- the front sloped portion has a gentler slope shape than the rear sloped portion, air resistance at the front portion of the protrusion is further reduced, and the rear sloped portion is made steeper. The effect of generating turbulence can be enhanced.
- the rear sloped portion has a gentler slope shape than the front sloped portion, the air resistance at the rear portion of the protrusion is further reduced, and the flow velocity of traveling wind is increased at the rear portion of the protrusion. Therefore, the disturbing effect can be further improved.
- the ninth aspect of the present invention since a plurality of projections that generate turbulence in the traveling wind are arranged on the outer periphery of the muffler, turbulent flow is generated over the entire outer periphery of the muffler to suppress entrainment of the traveling wind, The influence on the exhaust efficiency can be further suppressed.
- the outer surface of the cover member attached to the outside of the silencer main body is provided with the protrusion that causes turbulent flow of the traveling wind, so that the traveling wind flowing on the outermost surface of the silencer is separated. Get the effect of delaying. Therefore, it is possible to effectively suppress the inclusion of traveling wind at the rear end position of the silencer.
- FIG. 1 is a right side view of a motorcycle according to an embodiment of the present invention.
- FIG. 3 is a right side view of the vicinity of the muffler of the motorcycle.
- FIG. 3 is a top view of the vicinity of the rear wheel of the motorcycle. It is a perspective view of the muffler periphery of the above-mentioned motorcycle.
- FIG. 3 is a right side view of the muffler and the exhaust pipe of the motorcycle. It is a top view of a muffler and an exhaust pipe of the motorcycle. It is a side view of the front part of the muffler of the above-mentioned motorcycle. It is a top view of the front part of the muffler of the above-mentioned motorcycle.
- FIG. 10 is a top view of FIG. 9. It is a rear view of FIG. (A) is a plan view of a turbulent flow generation projection provided on the muffler body, and (b) is a side view of (a). (A) is the top view which changed the direction of the front-back direction of the said protrusion, (b) is a side view of (a). (A) is an explanatory view of the operation of the muffler without the protrusion, and (b) is an explanatory view of the operation of the muffler provided with the protrusion.
- FIG. 16 is a top view of FIG. 15.
- FIG. 16 is a rear view of FIG. 15.
- FIG. 7 is a right side view of the motorcycle according to the second embodiment of the present invention. It is a side view of a muffler of a motorcycle of a second embodiment.
- FIG. 20 is a top view of FIG. 19. It is a rear view of FIG.
- FIG. 7 is a right side view of the motorcycle according to the third embodiment of the present invention.
- FIG. 24 is a top view of FIG. 23.
- FIG. 24 is a rear view of FIG. 23.
- a motorcycle (saddle-riding type vehicle) 1 of the present embodiment includes a head pipe 13 at a front end portion of a body frame F.
- a front fork 11 and a steering handle 12 that pivotally support the front wheels WF are supported by the head pipe 13 so as to be steerable.
- a lower portion of a front portion of a swing type power unit (hereinafter referred to as a power unit U) is supported on a lower portion of the body frame F so as to be vertically swingable.
- the motorcycle 1 includes a power unit U in which an engine (internal combustion engine) E that is a prime mover and a rear wheel WR that is a drive wheel integrally swing with respect to a vehicle body frame F (vehicle body). It is a riding type vehicle.
- an engine internal combustion engine
- WR rear wheel WR that is a drive wheel integrally swing with respect to a vehicle body frame F (vehicle body). It is a riding type vehicle.
- the power unit U is an integral unit in which the engine E, which is the prime mover of the motorcycle 1, is arranged in the front part, and the transmission M for changing the output of the engine E is arranged in the left part of the rear part.
- an axle (rear wheel axle AR) of rear wheels WR that are drive wheels is supported.
- the lower front portion of the power unit U is supported by a support portion at the lower portion of the vehicle body frame F so as to be vertically swingable via a suspension link or the like.
- the rear end of the power unit U is supported by the rear end of the vehicle body frame F via a rear cushion 9 which is a shock absorber.
- the center line CL in FIG. 3 indicates the left-right center of the vehicle body.
- the vehicle body frame F includes a down frame 14 extending downward and rearward from the head pipe 13, a lower frame 15 extending rearward from a lower end portion of the down frame 14, and a rear upper portion from a rear end portion of the lower frame 15. And a rear frame 16 extending to.
- Left and right steps 19 for passengers are supported on the front portion of the rear frame 16 via brackets (not shown).
- the left and right steps 19 for the passenger are rotatable between a use state in which they are projected substantially horizontally outward in the vehicle width direction and a folded state in which they are inclined rearward and upward.
- the figure shows step 19 in the folded state.
- a seat 28 having front and rear seating surfaces for seating an occupant is supported above the rear part of the vehicle body cover 27.
- the vehicle body cover 27 includes a pair of left and right step floors 29 on which the driver sitting on the seat 28 rests his/her feet, a front body FB connected to the front of the step floor 29, and a rear body RB connected to the rear of the step floor 29. There is. Between the seat 28 and the steering handle 12 above the step floor 29, there is a straddle space that facilitates an occupant to straddle the vehicle body.
- the rear body RB has a front portion RB1 that rises above the step floor 29 and a rear portion RB2 that extends rearward from the upper end portion of the front portion RB1 and is substantially L-shaped in a side view.
- a rear wheel WR is swingably accommodated below the front portion RB1 and below the rear portion RB2 of the rear body RB by an inner cover (not shown) in the rear body RB and a rear fender 31 extending downward and rearward from the lower surface of the rear portion RB2 of the rear body RB.
- a tire house WH is defined.
- reference numeral 32 indicates a rear side cover that forms the left and right side surfaces of the rear body RB
- reference numeral 32a indicates a rear edge of the rear side cover 32 in the front portion RB1 of the rear body RB (hereinafter, referred to as a front rear edge of the rear body RB).
- the front rear edge 32a of the rear body RB is separated in front of the tire front end of the rear wheel WR (corresponding to the frontmost end of the rear wheel WR) in a side view.
- the rear edge 32a of the front portion of the rear body RB is arranged so that the rear edge of the folded step 19 overlaps.
- the step floor 29 has, for example, a flat shape across the left-right width of the low floor portion of the vehicle body, and forms a substantially horizontal upper surface (floor surface 29a) of the low floor portion.
- a center tunnel extending in the front-rear direction may be provided at the center of the step floor 29 in the left-right direction.
- the motorcycle 1 is a scooter type vehicle having a step floor 29 on which a driver places his/her feet.
- the upper surface (foot-resting surface) 29a of the step floor 29 is slightly inclined rearward and upward in a side view.
- a lower surface rear portion 29b that is steeper than the upper surface 29a and is inclined rearward and upward is formed at the rear portion of the lower surface side of the step floor 29.
- the power unit U integrally includes a front engine E and a transmission case 35 that accommodates a transmission M on the rear left side.
- the engine E is a 4-stroke single-cylinder engine in which a rotation center axis line of a crankshaft (not shown) is aligned in the left-right direction (vehicle width direction), and is substantially horizontal with the cylinder portion 22 facing forward from the front end portion of the crankcase 21. (Detailedly, slightly tilted forward)
- a case body 36 is integrally formed as a rear arm that extends to the left and then extends rearward.
- the case main body 36 is opened to the outside in the vehicle width direction, and the case cover 37 is attached to the open portion from the outside in the vehicle width direction.
- the case main body 36 and the case cover 37 form a transmission case 35 that houses the transmission M.
- the transmission M is a belt-type continuously variable transmission that is accommodated in the transmission case 35 over the lengthwise direction of the side view.
- the transmission M includes a drive pulley housed in the front part of the transmission case 35 and arranged coaxially with the crankshaft, a driven pulley housed in the rear part of the transmission case 35, a drive pulley and a driven pulley. And an endless V-belt (transmission belt) which is wound around (not shown).
- a rear wheel WR is integrally rotatably attached to a rear wheel axle AR (output shaft) protruding to the rear right side of the transmission case 35.
- a radiator 26 for cooling the engine E is arranged on the right side of the crankcase 21.
- a radiator cover 26a having an opening with a louver is attached to the left and right outer sides of the radiator 26.
- the front end of an auxiliary arm 38 extending in the front-rear direction is fixed to the rear right side of the crankcase 21.
- the auxiliary arm 38 supports the right end portion of the rear wheel axle AR at the rear end portion.
- the auxiliary arm 38 constitutes a swing arm that supports the rear wheel WR together with the transmission case 35.
- the lower ends of a pair of left and right rear cushions 9 are connected to the rear ends of the transmission case 35 and the auxiliary arm 38, respectively.
- the upper ends of the left and right rear cushions 9 are connected to the rear ends of the left and right rear frames 16, respectively.
- Reference numeral 39 in the figure denotes an inner fender that is integrally swingably attached to the power unit U and covers the front upper portion of the rear wheel WR, and reference numeral CA denotes a caliper supported above the rear portion of the auxiliary arm 38.
- a throttle body 24 as an intake system component is arranged above the cylinder portion 22 of the engine E.
- a front end portion on the downstream side of the throttle body 24 is connected to an upper portion of the cylinder portion 22 (intake port of the cylinder head) via an insulator (not shown).
- An air cleaner 25 is connected to a rear end portion on the upstream side of the throttle body 24 via a connecting tube 25a.
- the connecting tube 25 a is bent leftward in plan view behind the throttle body 24 and is connected to a front end portion of an air cleaner 25 arranged above the transmission case 35.
- Reference numeral 25b in the drawing denotes an element housed in the air cleaner 25.
- the intake port 25c located at the most upstream side of the intake system components is arranged outside the air cleaner 25.
- the intake system component may include a carburetor.
- An exhaust pipe 41 is connected to the lower portion of the cylinder portion 22 (exhaust port of the cylinder head).
- the exhaust pipe 41 is curved and extends rearward below the cylinder portion 22, and is extended rearward and upward and is bent outward in the vehicle width direction at a position generally below the radiator 26.
- the rear end of the exhaust pipe 41 is connected to the front end of a muffler (silencer) 42 arranged on the right side of the rear wheel WR.
- the muffler 42 is arranged on the opposite side of the air cleaner 25 across the rear wheel WR in the vehicle width direction. That is, the muffler 42 is arranged on the right side of the rear wheel WR, and the air cleaner 25 is arranged on the left side of the rear wheel WR.
- the muffler 42 includes a muffler body (silencer body) 43 having a cylindrical appearance, and a muffler covering a range extending from above the muffler body 43 to the outer side in the vehicle width direction. And a cover (cover member) 51.
- the muffler main body 43 extends linearly along the central axis C1 and is mounted on the vehicle body in a tilted posture that rises backward.
- the muffler body 43 is arranged, for example, with the central axis C1 parallel to the side surface of the vehicle body.
- the front-rear direction along the axis C1 in the side view may be referred to as the muffler front-rear direction
- the vertical direction orthogonal to the axis C1 in the side view may be referred to as the muffler vertical direction.
- An arrow UP1 in FIG. 11 indicates the upper side (the upper side in the vertical direction of the muffler) viewed from the direction along the axis C1 (the direction of the axis C1).
- the muffler body 43 includes a tubular body 44 along the central axis C1, a front cap 45 that closes the front end of the tubular body 44, and an end cap 46 that closes the rear end of the tubular body 44.
- the cylindrical body 44 has, for example, a double pipe structure having an inner and outer cylinder.
- the front cap 45 has a tapered shape in which the diameter increases toward the rear side, and the exhaust pipe 41 is connected to the front end portion.
- Reference numeral 41a in the drawing indicates a base end portion of the exhaust pipe 41 which is connected to the engine E.
- the end cap 46 has a taper shape in which the diameter decreases toward the rear side, and a tail pipe 49 is arranged at the rear end portion.
- the muffler body 43 has, for example, a basic configuration in which the inner space of the cylindrical body 44 is partitioned into a plurality of expansion chambers in the front-back direction of the muffler, and the plurality of expansion chambers are appropriately connected.
- the front end 46a of the end cap 46 forms a circular opening along a plane orthogonal to the axis C1.
- the rear end of the cylindrical body 44 is connected to the front end 46a of the end cap 46.
- the rear end 46b of the end cap 46 is inclined downward in a side view with respect to a plane orthogonal to the axis C1.
- a recess 46c having, for example, a substantially circular shape (in the drawing, a different shape) is formed when viewed from the direction of the axis C1.
- the recess 46c has a flat bottom 46d that is orthogonal to the axis C1.
- a tail pipe 49 is inserted through the bottom portion 46d of the recess 46c.
- the rear end of the tail pipe 49 projects rearward of the bottom portion 46d.
- the rear end of the tail pipe 49 projects rearward from the rear end 46b of the end cap 46.
- the tail pipe 49 is formed of, for example, a round pipe extending substantially coaxially with the axis C1.
- the rear end of the tail pipe 49 is cut, for example, in parallel with the rear end 46b of the end cap 46 or along a plane orthogonal to the axis C1.
- the rear end opening of the tail pipe 49 serves as an exhaust port 49a of the muffler 42.
- the rear end 46b of the end cap 46 may extend rearward of the rear end (exhaust port 49a) of the tail pipe 49.
- three mount brackets 47a, 47b, 47c for attaching to the auxiliary arm 38 and two cover brackets 48a for attaching the muffler cover 51 are provided on the outer periphery of the cylindrical body 44. 48b is fixed. Each of the mount brackets 47a, 47b, 47c is fastened to the auxiliary arm 38 using, for example, bolts along the vehicle width direction.
- the cover brackets 48a and 48b fasten and fix the muffler cover 51 with, for example, screws extending in the radial direction of the muffler body 43.
- reference numerals may be given to screws that are fastened to the cover brackets 48a and 48b.
- the muffler body 43 and thus the muffler 42 are integrally swingably attached to the power unit U by connecting the front end thereof to the exhaust pipe 41 and fastening a plurality of mount brackets 47a, 47b, 47c to the auxiliary arm 38.
- the motorcycle 1 shown in FIGS. 1 and 2 shows, for example, an empty vehicle 1G state. In the illustrated state, the muffler 42 is in an inclined posture in which the axis C1 is raised rearward.
- the muffler cover 51 has a length exceeding the front and rear ends of the muffler body 43 and extends in the direction of the axis C1.
- the muffler cover 51 covers a range extending from above the muffler body 43 to the outside in the vehicle width direction with a substantially constant gap.
- the upper surface portion 52 of the muffler cover 51 that covers the muffler body 43 from above has an inner edge 52a formed on the inner side in the vehicle width direction.
- the inner edge 52a extends substantially along the axis C1 (specifically, inclined toward the rear side slightly inward in the vehicle width direction) in a plan view.
- the inner edge 52a is located on the inner side in the vehicle width direction with respect to the axis C1 in a plan view.
- An inner eave portion 52b that covers the vicinity of the mount bracket 47a from above protrudes inward in the vehicle width direction at a portion of the upper surface portion 52 that overlaps the mount bracket 47a.
- the upper surface portion 52 is inclined upward with respect to the axis C1 in a side view and is inclined downward with respect to the axis C1 in front of the mount bracket 47a in a portion forming the inner eave portion 52b.
- the latter (inclined portion in front of the mount bracket 47a) is referred to as a rearward upward inclined portion 53
- the former a portion forming the inner eave portion 52b
- a rearward downward inclined portion 54 is referred to as a rearward downward inclined portion 54.
- a front end 53a of the rearward rising slope portion 53 is located in front of the front end of the muffler body 43.
- the front end 53a of the rearward-increasing inclined portion 53 is located above the axis C1 in a side view.
- a rectifying structure 61 for receiving a running wind and generating a prescribed flow velocity is formed at an inner edge portion 53b of the rearwardly rising inclined portion 53 on the inner side in the vehicle width direction.
- the rectification structure 61 functions as a canard that causes a swirling flow having a fast flow to flow to the right side of the tire house WH in which the rear wheels WR are arranged in the lower rear of the rear body RB, and sucks air in the tire house WH by the negative pressure of the swirling flow.
- the generation of positive pressure in the tire house WH is suppressed, and the influence of the turbulent flow of air accompanying the rear wheels WR on the peripheral parts is suppressed.
- a triangular opening 55a that is long in the front-rear direction is formed so as to match the raised portion 55 in a side view.
- the opening 55a penetrates the inside of the raised portion 55 in the vehicle width direction, and enables fastening work to the mount bracket 47a from the vehicle width direction outer side.
- the rear end of the upper surface portion 52 is located rearward of the rear end portion (end cap 46) of the muffler body 43 in the front-rear direction of the muffler.
- a rear end eaves portion 56 that is inclined downward with respect to the axis C1 in a side view is formed at the rear end portion of the upper surface portion 52.
- an arrow FR1 indicating the front in the front-rear direction of the muffler along the axis C1 and an arrow UP1 indicating the upper side in the up-down direction of the muffler orthogonal to the axis C1 in a side view are shown.
- the side surface portion 57 of the muffler cover 51 that covers the muffler body 43 from the side has a lower edge 57a that rises rearward along the axis C1 on the lower side.
- the lower edge 57a is located below the axis C1 in a side view.
- the rear end of the lower edge 57a extends to a position where it overlaps with the rear end portion (end cap 46) of the muffler body 43 in a side view.
- a side surface inclined portion 58 that is inclined inward in the vehicle width direction with respect to the axis C1 in a plan view is formed.
- the side surface inclined portion 58 is formed continuously with the rear end eaves portion 56, and these reduce the rear end portion of the muffler cover 51 in a tapered shape.
- the rear end edge 58a of the side surface inclined portion 58 extends upward from the rear end of the lower edge 57a in a side view so that the rear end edge 58a is located rearward with respect to the vertical direction of the muffler.
- the rear end edge 58a of the side surface inclined portion 58 is connected to the rear end edge 56a of the rear end eaves portion 56 of the upper surface portion 52.
- the rear end edge 56a of the upper surface portion 52 and the rear end edge 58a of the side surface portion 57 form a continuous rear end edge of the muffler cover 51.
- the front portion 57d of the lower edge 57a is bent upward on the rear side with respect to the front end portion (front cap 45) of the muffler body 43 in a side view, and is inward in the vehicle width direction in a plan view. Is bent toward.
- the front portion 57e of the side surface portion 57 is inclined inward in the vehicle width direction in plan view according to the inclination of the front portion of the lower edge 57a inward in the vehicle width direction.
- the front end 57b of the lower edge 57a is located in front of the front end of the muffler body 43.
- the front end 57b of the lower edge 57a is located above the axis C1 in a side view.
- a front end edge 57c extends upward and inward in the vehicle width direction from the front end 57b of the lower edge 57a.
- the front end edge 57c is inclined such that the front end 57c is located more forward in the vertical direction than the muffler in a side view.
- the front end edge 57c is connected to the front end 53a of the rearward rising inclined portion 53.
- the front edge 57c is also the front edge of the muffler cover 51.
- the rear end eaves portion 56 of the muffler cover 51 projects rearward from the rear end 46b of the end cap 46 and the rear end (exhaust port 49a) of the tail pipe 49.
- the side surface inclined portion 58 of the muffler cover 51 is located at a position overlapping the end cap 46 in a side view.
- the upper portion of the side surface inclined portion 58 extends toward the rear end eaves portion 56 while being inclined in a side view.
- the exhaust port 49a is located at a position overlapping the side surface inclined portion 58 in a side view.
- the rear eaves portion 56 and the side surface inclined portion 58 extend rearward of the exhaust port 49a.
- the traveling wind flowing along the outer surface of the side surface portion 57 of the muffler cover 51 flows along the side surface and then flows along the vehicle width direction inner side along the side surface inclined portion 58. After that, the traveling wind may be separated at the rear end edge 58a of the side surface inclined portion 58 to generate a vortex that is entrained in the exhaust port 49a side.
- the traveling wind that flows along the outer surface of the cover upper surface portion flows along the upper surface that is rearward and upward with respect to the horizontal direction, and then flows rearward and downward along the rear end eave portion 56 that is rearward and downward with respect to the horizontal direction. After that, the traveling wind may separate at the rear end edge 56a of the rear end eaves portion 56 and generate a vortex flow that is entrained in the exhaust port 49a side.
- a gap is provided between the muffler body 43 and the muffler cover 51.
- the traveling wind enters the gap from the front end side of the muffler 42.
- the traveling wind flows along the outer surface of the muffler body 43 and then blows out rearward from around the end cap 46.
- a protrusion 71 for disturbing traveling wind and generating a small turbulent flow is provided.
- the protrusion 71 projects upward from the upper surface 43b on the rear upper surface (outer surface) 43b of the muffler body 43.
- the protrusion 71 functions as an eddy current generator for generating a prescribed turbulent flow (vortex) in the traveling wind flowing along the outer surface 43b of the muffler body 43. That is, by intentionally causing a small turbulent flow by the protrusions 71, the air flow behind the rear end of the muffler body 43 is controlled, and the air resistance of the muffler 42 is reduced.
- a small protrusion is provided on the outer surface of the muffler 42 to generate a stable small vortex (turbulence) by the principle of a turbulent blade.
- the protrusions 71 reduce wind noise due to the occurrence of turbulence and improve the stability of the rear portion of the vehicle body.
- the protrusion 71 suppresses (retards) the separation of the traveling wind, thereby suppressing the influence of the traveling wind entrained on the exhaust port 49a at the rear end of the muffler 42 and maintaining the exhaust efficiency excellent.
- the protrusion 71 is provided rearward of a central position ct1 in the longitudinal direction of the muffler 42 (in the embodiment, the central position of the tubular body 44 having a constant cross section). That is, the protrusion 71 is provided in the second half region A1 in the longitudinal direction of the muffler 42. More preferably, the protrusion 71 is provided behind the central position ct2 of the rear half region A1 in the longitudinal direction of the muffler 42. That is, the protrusion 71 is provided in the area A2 on the rear end side 1 ⁇ 4 of the longitudinal direction of the muffler 42.
- the protrusion 71 is welded to the outer peripheral surface of the tubular body 44 of the muffler body 43. Unlike the other brackets, the protrusion 71 does not support other components such as the muffler body 43 and the muffler cover 51, but is independently provided on the outer surface of the muffler body 43. Therefore, the protrusion 71 can be optimally designed to generate a prescribed turbulent flow in the traveling wind flowing on the outer surface of the muffler body 43.
- the protrusion 71 is not limited to being welded to the muffler body 43, and may be fixed by a means other than welding or may be integrally formed with the muffler body 43.
- FIG. 12A is a plan view of the protrusion 71 seen from above in the vertical direction of the muffler
- FIG. 12B is a side view of the protrusion 71 seen from the vehicle width direction.
- FIG. 11 includes an aspect in which the protrusion 71 is viewed from the rear in the front-back direction of the muffler (direction of the axis C1).
- the protrusion 71 has an outer shape that extends along the muffler longitudinal direction (axis C1 direction, arrow Y direction).
- the projection 71 has an outer shape that is line-symmetric with respect to the axis C1 in the plan view of FIG.
- the projection 71 has an outer shape that is line-symmetrical with respect to the muffler radial direction line R1 that is parallel to the muffler vertical direction in the rear view of FIG.
- the protrusion 71 has a dimension (total length) Y1 in the muffler longitudinal direction, a dimension (full width) X1 in the muffler width direction (arrow X direction) orthogonal to the muffler longitudinal direction in the plan view of FIG. 12A, and the rear surface of FIG. It is made larger than any of the dimensions (total height) Z1 in the muffler radial direction (arrow Z direction) along the muffler radial direction line R1 when viewed. That is, the protrusion 71 has a protrusion longitudinal direction along the muffler longitudinal direction (axis C1 direction).
- the direction along the muffler width direction of the protrusion 71 in the plan view of FIG. 12A is referred to as the protrusion width direction
- the direction along the muffler radial direction line R1 of the protrusion 71 in the rear view of FIG. 11 is referred to as the protrusion height direction.
- the muffler longitudinal direction and the projection longitudinal direction are oriented in the vehicle front-rear direction.
- "to face the vehicle front-rear direction" is not limited to an arrangement parallel to the vehicle front-rear direction, but includes an arrangement inclined within a specified angle (for example, 45°) with respect to the vehicle front-rear direction.
- the protrusion height direction corresponds to a direction perpendicular to the protrusion installation position on the outer surface of the muffler 42.
- the protrusion installation position corresponds to the position of the center of gravity of the joint surface shape of the protrusion 71 to the muffler 42, for example.
- the protrusion 71 is formed such that the total width X1 in the protrusion width direction orthogonal to the protrusion longitudinal direction is narrower than the total length Y1 in the protrusion longitudinal direction.
- the protrusion 71 is formed such that the total height Z1 in the protrusion height direction orthogonal to the protrusion longitudinal direction is lower than the total length Y1 in the protrusion longitudinal direction.
- the protrusion 71 has a maximum width portion Xm in the protrusion width direction in front of the central position Yc in the protrusion longitudinal direction.
- the protrusion 71 has a pair of front side edges 72 that are inclined forward of the maximum width portion Xm so as to be positioned closer to the axis C1 toward the front.
- a front end edge 73 that extends between the front ends of the pair of front side edges 72 of the protrusion 71 has a forwardly convex arc shape.
- a locating hole 74 for positioning, for example, is formed at a position spaced above the outer surface of the muffler body 43 at the front end portion of the protrusion 71.
- the protrusion 71 has a pair of rear side edges 75 that are inclined rearward of the maximum width portion Xm so as to be positioned closer to the axis C1 toward the rear side.
- the rear end edge 76 extending between the rear ends of the pair of rear side edges 75 of the protrusion 71 has a rearward convex arc shape.
- the protrusion 71 has a maximum height portion Zm in the protrusion height direction in front of the central position Yc in the protrusion longitudinal direction.
- the maximum height portion Zm is located, for example, behind the maximum width portion Xm, but may be at the same front-back direction position as the maximum width portion Xm.
- Reference numeral Zt in the drawing indicates the upper end of the maximum height portion Zm (hereinafter referred to as the protruding top portion Zt).
- the protrusion 71 has a mountain shape having a protruding top portion Zt in a side view orthogonal to the longitudinal direction of the protrusion (side view seen from the width direction of the protrusion).
- the protrusion 71 has a first inclined portion 81 that inclines so as to be positioned further forward and lower than the protruding apex Zt, and a first curve from the front end of the first inclined portion 81. And a first wall portion 83 that extends downward with a steep inclination via the portion 82.
- the first inclined portion 81 corresponds to the front inclined portion and the first wall portion 83 corresponds to the front end portion of the protrusion.
- the protrusion 71 has a second inclined portion 84 that is inclined rearward of the projecting apex portion Zt and is positioned so as to be located lower toward the rear side.
- the second wall portion 86 extends downward with a steep inclination via the second curved portion 85.
- the second slanted portion 84 corresponds to the rear slanted portion, and the second wall portion 86 corresponds to the rear end portion of the protrusion.
- a locate hole 74 is formed in the second curved portion 85.
- the protrusion 71 has a substantially trapezoidal shape.
- the protrusion 71 includes a pair of side wall portions 87 that are inclined so as to be positioned closer to the muffler radial direction line R1 toward the upper side, and an upper wall portion 88 that extends between the front ends of the pair of side wall portions 87.
- the protrusion 71 has a first inclined portion 81 as a front-side inclined portion in front of the protruding top portion Zt, and also has a first inclined portion 81 in front of the protruding top portion Zt. It has a second inclined portion 84 as a rear inclined portion.
- the height of the protrusion 71 gradually increases in front of the protruding top Zt and gradually decreases behind the protruding top Zt.
- the air resistance when the protrusion 71 receives the traveling wind flowing along the outer surface of the muffler body 43 is reduced.
- the compression and expansion of the traveling wind become gentle, and the generation of noise (wind noise) is suppressed.
- the first inclined portion 81 as the front inclined portion is formed longer in the longitudinal direction of the protrusion than the second inclined portion 84 as the rear inclined portion. That is, the length L1 of the first inclined portion 81 in the protrusion longitudinal direction is longer than the length L2 of the second inclined portion 84 in the protrusion longitudinal direction.
- the protrusion 71 is formed such that the front sloped portion is more gently sloped than the rear sloped portion. Therefore, the air resistance at the front portion of the protrusion 71 is reduced, and turbulence is easily generated at the rear portion of the protrusion 71.
- the width of the protrusion 71 gradually increases in front of the maximum width portion Xm near the protruding top portion Zt and gradually decreases behind the maximum width portion Xm. This also reduces air resistance and suppresses the generation of noise (wind noise).
- FIG. 13 shows a modification in which the front-back direction of the protrusion 71 is interchanged.
- the first inclined portion 81 as the rear inclined portion is formed longer in the protrusion longitudinal direction than the second inclined portion 84 as the front inclined portion.
- the protrusion 71′ is formed such that the rear side inclined portion is more inclined than the front side inclined portion.
- the protrusion 71′ becomes close to a streamlined shape, and it is possible to prevent the traveling wind that has passed the protruding top portion Zt from being separated at the rear portion of the protrusion 71′, and increase the flow velocity of the traveling wind at the rear portion of the protrusion 71′, resulting in disturbance of the traveling wind.
- Improve the effect is provided in which the front-back direction of the protrusion 71 is interchanged.
- a plurality of protrusions 71 may be provided on the outer periphery of the muffler 42.
- a protrusion 71 is provided on the upper portion of the muffler 42, and, for example, a protrusion 71 (shown by a chain double-dashed line) is also provided obliquely below the muffler 42.
- the protrusion 71 is not limited to the portion covered by the muffler cover 51, and may be provided at a position avoiding the muffler cover 51.
- the protrusion 71 is not limited to the rear portion of the muffler 42, and may be provided on the front portion of the muffler 42.
- the traveling wind W1 flowing along the outer surfaces of the muffler cover 51 and the muffler main body 43 becomes the entrained wind W2 that is folded back toward the exhaust port 49a.
- the traveling wind flowing on the outer surface of the muffler cover 51 has the rear end eaves 56 and the side surface inclined portions 58 extending to the rear of the exhaust port 49a. Little impact.
- the traveling wind flowing on the outer surface of the muffler body 43 is caught in the exhaust port 49a immediately after passing through the rear end 46b of the end cap 46, which may affect the exhaust from the exhaust port 49a. This effect is mitigated by increasing the amount of protrusion of the tail pipe 49 rearward and providing the turbulent flow generation projection 71 at the rear portion of the muffler 42.
- the boundary layer of the traveling wind is turbulent on the upper surface side of the muffler body 43, and the separation of the air flow at the rear end of the muffler body 43 is delayed.
- the muffler structure of the saddle-ride type vehicle in the above-described embodiment is the muffler structure of the motorcycle 1 including the muffler 42 that muffles the exhaust gas discharged from the engine E.
- the projection 71 is provided to project a predetermined turbulent flow from the traveling wind that projects from the outer surface 43b and flows along the outer surface 43b.
- the muffler 42 has, on the outer surface thereof, the projections 71 that cause turbulence in the traveling wind that flows along the outer surface. Therefore, the prescribed turbulence that occurs behind the projections 71 causes the muffler 42 to travel from the outer surface. It has the effect of delaying the separation of wind.
- the muffler 42 includes a muffler body 43 and a muffler cover 51 attached to the muffler body 43, and the protrusion 71 includes at least one of the muffler body 43 and the muffler cover 51.
- the muffler body 43 in the above embodiment since the protrusion 71 is provided on at least one of the muffler body 43 and the muffler cover 51, it is possible to increase the degree of freedom in installing the protrusion 71 and easily control the air flow.
- an exhaust port 49a for discharging exhaust gas to the atmosphere is provided at a rear end of the muffler body 43, and the muffler cover 51 extends rearward from the exhaust port 49a. ..
- the muffler cover 51 extends rearward of the exhaust port 49a and hides the exhaust port 49a to provide a silencer structure that improves the appearance and exhausts the wind that is entrained from the rear end of the muffler cover 51. It is possible to suppress the influence on the mouth 49a.
- the end cap 46 extends rearward of the exhaust port 49a, it is possible to prevent the wind entrained from the rear end of the muffler body 43 from affecting the exhaust port 49a.
- the protrusion 71 is provided rearward of the central position ct1 of the muffler 42 in the longitudinal direction of the muffler 42. According to this configuration, since the protrusion 71 is provided on the rear half portion of the muffler 42 in the longitudinal direction, the turbulent flow of the traveling wind generated at the protrusion 71 easily reaches the rear end position of the muffler 42, and the turbulent flow at the rear end position of the muffler 42 is easily generated. It is possible to effectively suppress the inclusion of traveling wind.
- the protrusion 71 has a protrusion longitudinal direction that faces the vehicle front-rear direction, and a dimension in the protrusion longitudinal direction (total length Y1) is a dimension in a direction orthogonal to the protrusion longitudinal direction ( Overall width X1 and overall height Z1).
- the dimension of the protrusion 71 in the direction orthogonal to the longitudinal direction of the protrusion is smaller than the dimension of the protrusion 71 in the longitudinal direction of the vehicle. Therefore, the air resistance of the protrusion 71 can be reduced.
- the dimension of the protrusion 71 in the longitudinal direction of the vehicle, which is oriented in the vehicle front-rear direction, is large, the pressure change of the traveling wind can be moderated by using the length of the protrusion 71, and wind noise can be suppressed.
- the protrusion 71 has a chevron shape having a projecting apex Zt in a side view orthogonal to the longitudinal direction of the protrusion, and the protrusion 71 has a front end in the vehicle front-rear direction. There is a front sloped portion that becomes higher toward the protruding top Zt, and a rear sloped portion that becomes lower toward the rear end of the protrusion from the protruding top Zt is provided on the vehicle front-rear direction rear side of the protrusion 71. ..
- the front portion of the protrusion 71 has a front inclined portion that gradually increases, and the rear portion of the protrusion 71 has a rear inclined portion that gradually lowers, so that the air resistance of the protrusion 71 is further reduced and the vehicle travels.
- the pressure change of the wind can be moderated.
- the front sloped portion when the front sloped portion is longer than the rear sloped portion in the protrusion longitudinal direction, the front sloped portion has a gentler slope shape than the rear sloped portion. 71 It is possible to further reduce the air resistance at the front part and to enhance the effect of generating a turbulent flow by steeply tilting the rear side slope part.
- the rear inclined portion when the rear inclined portion is longer than the front inclined portion in the protrusion longitudinal direction, the rear inclined portion has a gentler slope shape than the front inclined portion. It is possible to further reduce the air resistance at the rear portion of 71 and increase the flow velocity of the traveling wind at the rear portion of the protrusion 71 to further improve the effect of disturbing the traveling wind.
- a plurality of the protrusions 71 may be arranged on the outer periphery of the muffler 42.
- a plurality of protrusions 71 that generate turbulent flow in the traveling wind are arranged on the outer periphery of the muffler 42, turbulent flow is generated over the entire outer periphery of the muffler 42 to suppress entrainment of the traveling wind and to further affect the exhaust efficiency. Can be suppressed.
- a projection 71 protruding upward from the upper surface 51b is provided on the rear upper surface (outer surface) 51b of the muffler cover 51. Similar to the protrusion 71 of the first embodiment, the protrusion 71 functions as an eddy current generator for generating a specified turbulent flow (vortex) in the traveling wind flowing along the outer surface 51b of the muffler body 43. That is, by intentionally producing a small turbulent flow by the protrusion 71, the air flow in the rear end of the muffler cover 51 is controlled, and the air resistance of the muffler 42 is reduced. In addition, the protrusion 71 suppresses (delays) the separation of the traveling wind, thereby suppressing the influence of the traveling wind entrained on the exhaust port 49a at the rear end of the muffler 42, and maintains the exhaust efficiency excellent.
- a specified turbulent flow vortex
- the muffler 42 includes a muffler body 43 and a muffler cover 51 attached to the outside of the muffler body 43, and the protrusion 71 includes the muffler cover 51. It is provided in. According to this configuration, since the protrusion 71 that causes the turbulent flow of the traveling wind is provided on the outer surface of the muffler cover 51 attached to the outside of the muffler main body 43, the effect of delaying the separation of the traveling wind flowing through the outermost surface of the muffler 42 is provided. obtain. For this reason, it is possible to effectively suppress the inclusion of traveling wind at the rear end position of the muffler 42.
- the muffler cover 51 of the embodiment has the rear end portion extending to the rear of the exhaust port 49a, the same effect as above can be obtained even if the muffler cover 51 terminates in front of the exhaust port 49a. it can.
- the effect of providing the turbulent flow generation projection 71 is highly effective.
- the protrusion 71 is integrally formed on the upper surface of the muffler cover 51, for example, but the present invention is not limited to this, and a separate item may be fixed by adhesion, screwing, or the like.
- FIGS. a second embodiment of the present invention will be described with reference to FIGS.
- This embodiment is different from the first embodiment in that it is not a scooter type vehicle having a step floor and a straddling space, but a sports type motorcycle having a knee grip portion in front of the seat and bar type steps on both sides of the vehicle body. It is especially different in that it is applied to.
- the same components as those of the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
- the vehicle body frame F2 of the motorcycle 101 includes a head pipe 113 located at the front end, a pair of left and right main frames 114 extending downward and rearward from the head pipe 113, and left and right main frames.
- a pair of left and right pivot frames 115 extending downward from a rear end portion 114 is provided.
- a front wheel WF of the motorcycle 101, a pair of left and right front forks 11 and a steering handlebar 12 are supported by the head pipe 113 so as to be steerable.
- a front end of a swing arm 117 is supported on the left and right pivot frames 115 so as to be vertically swingable.
- a rear wheel WR of the motorcycle 101 is supported at the rear end of the swing arm 117.
- the front ends of the seat frames 116 are connected to the rear parts of the left and right main frames 114.
- a fuel tank 133 is supported above the left and right main frames 114.
- a seat 128 on which a passenger is seated is supported above the seat frame 116 behind the fuel tank 133.
- the fuel tank 133 constitutes a knee grip portion in front of the seat 128.
- the left and right pivot frames 115 support a pair of left and right steps 118 on which an occupant rests his/her feet.
- the body of the motorcycle 101 is covered with a body cover 127.
- the vehicle body cover 127 includes a front cowl FC2 that covers a front portion of the vehicle body, a lower cowl LC that extends below the front cowl FC2 and covers a lower portion of the vehicle body, and a rear cowl RC2 that covers a rear portion of the seat frame 116.
- An engine (internal combustion engine) E which is a prime mover of the motorcycle 101, is supported below the left and right main frames 114.
- the exhaust pipe 141 extending from the cylinder of the engine E is arranged inside the front cowl FC2 and the lower cowl LC.
- the exhaust pipe 141 extends from the right side of the rear portion of the lower cowl LC so as to incline rearward and is connected to the front end portion of a muffler (silencer) 142 arranged on the right side of the rear wheel WR.
- the muffler 142 includes a muffler body (silencer body) 143 extending in a prescribed cross-sectional shape.
- a muffler cover cover member
- a line C2 in the drawing indicates a central axis line passing through, for example, the center of gravity of the cross-sectional shape of the muffler body 143.
- the muffler body 143 extends in a straight line along the central axis C2 and is mounted on the vehicle body in a rearwardly inclined posture.
- the muffler body 143 is arranged, for example, with the central axis C2 parallel to the side surface of the vehicle body.
- the front-back direction along the axis C2 in a side view is referred to as the muffler front-back direction
- the vertical direction orthogonal to the axis C2 in a side view is referred to as the muffler vertical direction.
- an arrow FR2 indicating the front in the front-rear direction of the muffler along the axis C2 and an arrow UP2 indicating the upper side in the vertical direction of the muffler orthogonal to the axis C2 in a side view are shown.
- the muffler body 143 includes a cylinder 144 along the central axis C2, a front cap 145 that closes the front end of the cylinder 144, and an end cap 146 that closes the rear end of the cylinder 144.
- the cylindrical body 144 has a modified cross-sectional shape in which an upper portion having a substantially polygonal shape and a lower portion having a substantially V-shape are combined when viewed from the direction of the axis C2. When viewed from the direction of the axis C2, the cylindrical body 144 forms a downwardly inclined plane-shaped chamfered portion on the outer side in the vehicle width direction of the lower portion to earn a bank angle of the motorcycle 101.
- the front cap 145 has a tapered shape in which the diameter increases toward the rear side, and the exhaust pipe 141 is connected to the front end portion.
- the end cap 146 has a tapered shape whose diameter decreases toward the rear side, and a tail pipe 149 is arranged at the rear end portion.
- the front end 146a of the end cap 146 forms an opening of a different shape similar to the tubular body 144 along a plane orthogonal to the axis C2.
- the rear end of the cylindrical body 144 is connected to the front end 146a of the end cap 146.
- the rear end 146b of the end cap 146 is slightly inclined downward in a side view with respect to the plane orthogonal to the axis C2.
- a concave portion 146c having a different shape, which is slightly smaller than, for example, the cylindrical body 144 when viewed in the direction of the axis C2, is formed.
- the recess 146c has a planar bottom portion 146d orthogonal to the axis C2.
- a tail pipe 149 is inserted through the bottom portion 146d.
- the rear end of the tail pipe 149 is arranged in the recess 146c.
- the rear end of the tail pipe 149 becomes the exhaust port 149a of the muffler 142.
- the rear end 146b of the end cap 146 extends rearward of the rear end (exhaust port 149a) of the tail pipe 149.
- the rear upper surface (outer surface) 143b of the muffler body 143 is provided with a protrusion 71 protruding upward from the upper surface 143b.
- the protrusion 71 functions as an eddy current generator for generating a prescribed turbulent flow (vortex) in the traveling wind flowing along the outer surface 143b of the muffler body 143. That is, by intentionally causing a small turbulent flow by the protrusion 71, the air flow behind the rear end of the muffler body 143 is controlled, and the air resistance of the muffler 142 is reduced. Further, the protrusion 71 suppresses (delays) the separation of the traveling wind, thereby suppressing the influence of the traveling wind entrained on the exhaust port 149a at the rear end of the muffler 142, and maintains the exhaust efficiency excellent.
- the protrusion 71 is provided behind the central position of the muffler 142 (in the embodiment, the central position of the tubular body 144 having a constant cross section) in the longitudinal direction of the muffler 142. That is, the protrusion 71 is provided in the second half region of the muffler 142 in the longitudinal direction. More preferably, the protrusion 71 is provided behind the central position of the rear half region of the muffler 142 in the longitudinal direction. That is, the protrusion 71 is provided in a region on the rear end side 1 ⁇ 4 of the longitudinal direction of the muffler 142.
- the protrusion 71 is welded to the outer peripheral surface of the cylindrical body 144 of the muffler body 143.
- the protrusion 71 does not support other components such as the muffler body 143 and the muffler cover, but is independently provided on the outer surface of the muffler body 143. Therefore, the protrusion 71 can be optimally designed to generate a prescribed turbulence in the traveling wind flowing on the outer surface of the muffler body 143.
- the protrusion 71 is not limited to being welded to the muffler body 143, but may be fixed by means other than welding or may be integrally formed with the muffler body 143.
- the projection 71 of FIGS. 19 and 20 has a first inclined portion 81 as a front-side downward inclined portion in front of the protruding apex Zt, and as a rear-side rearward inclined portion behind the protruding apex Zt.
- the configuration has the second inclined portion 84, the front-back direction of the protrusion 71 may be interchanged as in the modification of FIG. 13.
- a plurality of protrusions 71 may be provided on the outer circumference of the muffler 142.
- the protrusion 71 may be provided on the muffler cover.
- the protrusion 71 is not limited to the rear portion of the muffler 142, and may be provided on the front portion of the muffler 142.
- the protrusion 71 that causes turbulent flow in the traveling wind flowing along the outer face is provided on the outer surface of the muffler 142,
- the prescribed turbulent flow generated in the rear has an effect of delaying separation of traveling wind from the outer surface of the muffler 142. Therefore, it is possible to suppress the air resistance caused by the separation of the traveling wind immediately after the rear end of the muffler 142. In addition, it is possible to suppress the entrainment of traveling wind toward the exhaust port 149a at the rear end of the muffler 142, to prevent the exhaust from the exhaust port 149a, and to perform the efficient exhaust.
- FIGS. 1 and 2 a third embodiment of the present invention will be described with reference to FIGS.
- This embodiment is different from the first embodiment in that it is applied not to a scooter type vehicle having a swing unit but to a business type motorcycle having an engine supported on a vehicle body.
- the same components as those of the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
- a motorcycle (saddle-riding type vehicle) 201 of the third embodiment is provided with a so-called underbone type body frame F3 to improve the ease of straddling the vehicle body and lower the center of gravity of the vehicle. It is trying to make it.
- the vehicle body frame F3 includes a head pipe 213 located at the front end, a main frame 214 extending downward and rearward from the head pipe 213, and a pivot frame 215 extending downward from the rear end of the main frame 214.
- a front wheel WF of the motorcycle 201, a pair of left and right front forks 11, and a steering handle 12 are rotatably supported by the head pipe 213.
- a front end of a swing arm 217 is supported on the pivot frame 215 so as to be vertically swingable.
- a rear wheel WR of the motorcycle 201 is supported on the rear end of the swing arm 217.
- the front end of the seat frame 216 is connected to the rear of the main frame 214.
- a pair of left and right rear cushions 9 are arranged between the seat frame 216 and the swing arm 217.
- the motorcycle body is covered with a body cover 227.
- the vehicle body cover 227 includes a front body cover FC3 that covers the head pipe 213 and the front part of the main frame 214, and a rear body cover RC3 that covers the rear part of the main frame 214 and the seat frame 216.
- Left and right leg shields LS are formed on the left and right sides of the front body cover FC3 so as to project outward in the left and right directions.
- a seat 228 for seating an occupant is supported above the rear body cover RC3.
- the engine E which is the prime mover of the motorcycle 201, is supported below the main frame 214. Steps 218 on which an occupant puts his/her feet are arranged on both left and right sides of the engine E.
- the exhaust pipe 241 extending from the cylinder of the engine E extends rearward in the lower right portion of the engine E.
- the exhaust pipe 241 is connected to the front end of a muffler (silencer) 242 arranged on the right side of the rear wheel WR near the rear end of the engine E.
- the muffler 242 includes a muffler body (silencer body) 243 extending in a circular cross-sectional shape.
- the muffler cover (cover member) that covers the outside of the muffler body 243 is not provided, but the muffler cover may be provided.
- the line C3 in the figure indicates the central axis of the muffler body 243.
- the muffler body 243 extends linearly along the central axis C3 and is mounted on the vehicle body in a slightly tilted rearward posture.
- the muffler body 243 is arranged, for example, with the central axis C3 parallel to the side surface of the vehicle body.
- the front-back direction along the axis C3 in the side view is referred to as the muffler front-back direction
- the vertical direction orthogonal to the axis C3 in the side view is referred to as the muffler vertical direction.
- an arrow FR3 indicating the front in the front-rear direction of the muffler along the axis C3 and an arrow UP3 indicating the upper side in the up-down direction of the muffler orthogonal to the axis C3 in a side view are shown.
- the muffler body 243 includes a cylinder 244 along the central axis C3, a front cap 245 that closes the front end of the cylinder 244, and an end cap 246 that closes the rear end of the cylinder 244.
- the cylindrical body 244 has a circular cross-sectional shape when viewed from the direction of the axis C3, and has a gentle taper shape whose diameter increases toward the rear side.
- the front cap 245 has a tapered shape in which the diameter increases toward the rear side, and the exhaust pipe 241 is connected to the front end portion.
- the end cap 246 has a tapered shape in which the diameter decreases toward the rear side, and a tail pipe 249 is arranged at the rear end.
- the front end 246a of the end cap 246 forms a circular opening similar to the cylindrical body 244 along a plane orthogonal to the axis C3.
- the rear end of the cylindrical body 244 is connected to the front end 246a of the end cap 246.
- the rear end 246b of the end cap 246 forms a circular opening that is slightly smaller than the front end 246a along the plane orthogonal to the axis C3.
- a circular recess 246c is formed at the rear end 246b of the end cap 246 when viewed from the direction of the axis C3.
- the recess 246c has a planar bottom portion 246d orthogonal to the axis C3.
- a tail pipe 249 is inserted through the bottom portion 246d.
- the rear end of the tail pipe 249 projects slightly rearward from the rear end 246b of the end cap 246.
- the rear end of the tail pipe 249 serves as the exhaust port 249a of the muffler 242.
- the rear end 246b of the end cap 246 may extend rearward of the rear end (exhaust port 249a) of the tail pipe 249.
- a projection 71 protruding upward from the upper surface 243b is provided on the rear upper surface (outer surface) 243b of the muffler body 243.
- the protrusion 71 functions as an eddy current generator for generating a prescribed turbulent flow (vortex) in the traveling wind flowing along the outer surface 243b of the muffler body 243. That is, by intentionally causing a small turbulent flow by the protrusion 71, the air flow behind the rear end of the muffler body 243 is controlled and the air resistance of the muffler 242 is reduced. Further, the protrusion 71 suppresses (delays) the separation of the traveling wind, thereby suppressing the influence of the traveling wind entrained on the exhaust port 249a at the rear end of the muffler 242, and maintaining the exhaust efficiency excellent.
- the protrusion 71 is provided behind the central position of the muffler 242 (in the embodiment, the central position of the tubular body 244 having a constant cross section) in the longitudinal direction of the muffler 242. That is, the protrusion 71 is provided in the second half region of the muffler 242 in the longitudinal direction. More preferably, the protrusion 71 is provided behind the central position of the rear half region of the muffler 242 in the longitudinal direction. That is, the protrusion 71 is provided in a region on the rear end side 1 ⁇ 4 of the muffler 242 in the longitudinal direction.
- the protrusion 71 is welded to the outer peripheral surface of the cylindrical body 244 of the muffler body 243.
- the protrusion 71 does not support other components such as the muffler body 243 and the muffler cover, but is independently provided on the outer surface of the muffler body 243. Therefore, the protrusion 71 can be optimally designed in order to generate a turbulent flow in the traveling wind flowing on the outer surface of the muffler body 243.
- the protrusion 71 is not limited to being welded to the muffler body 243, but may be fixed by means other than welding or may be integrally formed with the muffler body 243.
- the projection 71 in FIGS. 23 and 24 has a first inclined portion 81 as a frontwardly inclined front side inclined portion in front of the protruding apex portion Zt, and as a rearwardly downwardly inclined rear side inclined portion as a rearward inclined rearward inclined portion.
- the configuration has the second inclined portion 84, the front-back direction of the protrusion 71 may be interchanged as in the modification of FIG. 13.
- a plurality of protrusions 71 may be provided on the outer circumference of the muffler 242. If the muffler 242 includes a muffler cover, the protrusion 71 may be provided on the muffler cover.
- the protrusion 71 is not limited to the rear portion of the muffler 242, but may be provided on the front portion of the muffler 242.
- the protrusion 71 that causes turbulent flow in the traveling wind flowing along the outer face is provided on the outer surface of the muffler 242
- the prescribed turbulent flow generated in the rear has the effect of delaying the separation of traveling wind from the outer surface of the muffler 242. Therefore, it is possible to suppress the air resistance due to the separation of the traveling wind immediately after the rear end of the muffler 242.
- the present invention is not limited to the above embodiment, and the protrusion 71 may be provided on both the muffler body and the cover member, for example.
- the protrusions 71 may be provided on both silencers.
- the saddle-riding type vehicle includes all vehicles that a driver rides across the vehicle body, and includes not only motorcycles (including a motorized bicycle and a scooter type vehicle) but also three wheels (one front wheel and two rear wheels). , Including two front wheels and one rear wheel) or four wheels.
- the configurations in the above embodiments are examples of the present invention, and various modifications can be made without departing from the scope of the present invention, such as replacing the components of the embodiments with known components.
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Abstract
Description
しかし、上記従来の構造では、走行風対策については何ら記載されておらず、上記課題が残されている。 By the way, in a muffler that projects outward in the vehicle width direction, it is desirable to fully consider measures against traveling wind. As measures against the traveling wind, it is possible to reduce the air resistance and suppress the inclusion of traveling wind into the exhaust port.
However, in the above-mentioned conventional structure, there is no description of measures against traveling wind, and the above-mentioned problem remains.
図1に示すように、本実施形態の自動二輪車(鞍乗り型車両)1は、車体フレームFの前端部にヘッドパイプ13を備えている。ヘッドパイプ13には、前輪WFを軸支するフロントフォーク11及び操向ハンドル12が繰向可能に支持されている。車体フレームFの下部には、スイング式動力ユニット(以下、パワーユニットUという。)の前部下側が上下揺動可能に支持されている。自動二輪車1は、原動機であるエンジン(内燃機関)Eと駆動輪である後輪WRとが車体フレームF(車体本体)に対して一体的に揺動するパワーユニットUを備えたユニットスイング式の鞍乗り型車両である。 <Whole vehicle>
As shown in FIG. 1, a motorcycle (saddle-riding type vehicle) 1 of the present embodiment includes a
自動二輪車1は、運転者が足を載せるステップフロア29を有するスクーター型車両である。ステップフロア29の上面(足載せ面)29aは、側面視でやや後ろ上がりに傾斜している。ステップフロア29の下面側の後部には、上面29aよりも急傾斜をなして後上がりに傾斜する下面後部29bが形成されている。 The
The
図1~図3に示すように、パワーユニットUは、前部のエンジンEと後部左側で変速機Mを収容する変速機ケース35とを一体に備えている。
エンジンEは、不図示のクランクシャフトの回転中心軸線を左右方向(車幅方向)に沿わせた4ストローク単気筒エンジンであり、クランクケース21の前端部からシリンダ部22を前方に向けて略水平に(詳細にはやや前上がりに傾斜させて)突出させている。 <Power unit>
As shown in FIGS. 1 to 3, the power unit U integrally includes a front engine E and a
The engine E is a 4-stroke single-cylinder engine in which a rotation center axis line of a crankshaft (not shown) is aligned in the left-right direction (vehicle width direction), and is substantially horizontal with the
図5、図6、図11に示すように、マフラー42は、円筒状の外観をなすマフラー本体(消音器本体)43と、マフラー本体43の上方から車幅方向外側方に渡る範囲を覆うマフラーカバー(カバー部材)51と、を備えている。 <Muffler>
As shown in FIGS. 5, 6, and 11, the
図5、図6、図11に示すように、マフラーカバー51は、マフラー本体43の前後端を越える長さを有して軸線C1方向に延びている。マフラーカバー51は、マフラー本体43の上方から車幅方向外側に渡る範囲を、概ね一定の隙間を空けて覆っている。 <Muffler cover>
As shown in FIGS. 5, 6, and 11, the
図7、図8を併せて参照し、上面部52の後端は、マフラー本体43の後端部(エンドキャップ46)よりもマフラー前後方向で後方に位置している。上面部52の後端部には、側面視で軸線C1に対して下向きに傾斜した後端庇部56が形成されている。図中適所には、軸線C1に沿うマフラー前後方向の前方を示す矢印FR1、側面視で軸線C1と直交するマフラー上下方向の上方を示す矢印UP1が示されている。 On the raised
Referring to FIGS. 7 and 8 together, the rear end of the
下縁57aの後端は、側面視でマフラー本体43の後端部(エンドキャップ46)と重なる位置まで延びている。側面部57の後端部には、平面視で軸線C1に対して車幅方向内側に傾斜した側面傾斜部58が形成されている。側面傾斜部58は、後端庇部56と連続的に形成され、これらがマフラーカバー51の後端部をテーパー状に縮径させている。側面傾斜部58の後端縁58aは、側面視で下縁57aの後端から上方へ、マフラー上下方向に対して上側ほど後方に位置するように傾斜して延びている。側面傾斜部58の後端縁58aは、上面部52の後端庇部56の後端縁56aに連なっている。上面部52の後端縁56aおよび側面部57の後端縁58aは、マフラーカバー51の連続した後端縁を形成している。 The
The rear end of the
カバー上面部の外面に沿って流れる走行風は、水平方向に対して後ろ上がりの上面に沿って流れた後に、水平方向に対して後下がりの後端庇部56に沿って後下方に流れる。その後、走行風が後端庇部56の後端縁56aで剥離し、排気口49a側に巻き込む渦流を発生することがある。 The traveling wind flowing along the outer surface of the
The traveling wind that flows along the outer surface of the cover upper surface portion flows along the upper surface that is rearward and upward with respect to the horizontal direction, and then flows rearward and downward along the rear
図5~図8に示すように、突起71は、マフラー本体43の後部上面(外面)43bにおいて、上面43bから上方に突出している。突起71は、マフラー本体43の外面43bに沿って流れる走行風に規定の乱流(渦流)を生じさせるための渦流生成器として機能する。すなわち、突起71により意図的に小さな乱流を生じさせることで、マフラー本体43の後端後方における気流を制御し、マフラー42の空気抵抗を減らす等の効果を得る。 <Muffler protrusion structure>
As shown in FIGS. 5 to 8, the
突起71は、マフラー長手方向(軸線C1方向、矢印Y方向)に沿って延びる外形状を有している。突起71は、図12(a)の平面視で、軸線C1に関し線対称の外形状を有している。突起71は、図11の後面視で、マフラー上下方向と平行なマフラー径方向線R1に関し線対称の外形状を有している。 FIG. 12A is a plan view of the
The
この変形例の突起71’は、後側傾斜部としての第一傾斜部81が、前側傾斜部としての第二傾斜部84よりも突起長手方向で長く形成されている。これにより、突起71’は、後側傾斜部が前側傾斜部よりも緩やかな傾斜で形成されている。このため、突起71’が流線形に近くなり、突出頂部Ztを過ぎた走行風が突起71’後部で剥離することを抑えるとともに、突起71’後部で走行風の流速が高まり、走行風の撹乱効果を向上させる。 FIG. 13 shows a modification in which the front-back direction of the
In the
次に、本実施形態の突起71の作用について図14を参照して説明する。
図14(a)の比較例を参照し、自動二輪車1の走行時、マフラー42の周囲に走行風が流れると、マフラー42の後部下方および後端後方には負圧が生じる。マフラー42における上面側および側面側を流れた走行風は、マフラー42の後部下方および後端後方の負圧に吸い込まれるとともに、マフラー42の外面に沿うように湾曲し、マフラー42の後部下方および後端後方に回り込むように流れる。このとき、走行風がマフラー42外面から剥離することで、マフラー42周りに空気抵抗を生じさせる。 <Action>
Next, the operation of the
Referring to the comparative example of FIG. 14A, when traveling wind flows around the
この構成によれば、マフラー42の外面に、外面に沿って流れる走行風に乱流を生じさせる突起71を備えるので、突起71の後方において生じる規定の乱流によって、マフラー42の外面からの走行風の剥離を遅らせる効果を得る。このため、マフラー42の後端の直後で走行風が剥離することによる空気抵抗を抑えることができる。また、マフラー42後端の排気口49aに向けた走行風の巻き込みを抑え、排気口49aからの排気を阻害せず、効率のよい排気を行うことができる。 As described above, the muffler structure of the saddle-ride type vehicle in the above-described embodiment is the muffler structure of the
According to this configuration, the
この構成によれば、マフラー本体43およびマフラーカバー51の少なくとも一方に突起71を設けるので、突起71の設置自由度を高め、気流の制御を容易に行うことができる。 In the muffler structure for a saddle-ride type vehicle, the
According to this configuration, since the
この構成によれば、マフラーカバー51が排気口49aよりも後方に延びて排気口49aを隠すタイプの消音器構造となり、外観性を向上させるとともに、マフラーカバー51の後端からの巻き込み風が排気口49aに影響を与えることを抑えることができる。なお、エンドキャップ46が排気口49aよりも後方に延びる構成の場合、マフラー本体43の後端からの巻き込み風が排気口49aに影響を与えることを抑えることができる。 In the muffler structure for the saddle-riding type vehicle, an
According to this configuration, the
この構成によれば、マフラー42の長手方向の後半部分に突起71を設けるので、突起71で生じた走行風の乱流がマフラー42の後端位置に至りやすく、マフラー42の後端位置での走行風の巻き込みを効果的に抑えることができる。 In the muffler structure for the saddle-ride type vehicle, the
According to this configuration, since the
この構成によれば、突起71の車両前後方向を向く突起長手方向の寸法に対し、突起長手方向と直交する方向の寸法を小とするので、突起71の空気抵抗を軽減することができる。また、突起71の車両前後方向を向く突起長手方向の寸法を大とするので、突起71の長さを利用して走行風の圧力変化を緩やかにし、風切り音の発生を抑えることができる。 In the muffler structure for a saddle-ride type vehicle, the
According to this structure, the dimension of the
この構成によれば、突起71の前部に漸次高くなる前側傾斜部を有するとともに、突起71の後部に漸次低くなる後側傾斜部を有するので、突起71の空気抵抗をより軽減するとともに、走行風の圧力変化を緩やかにすることができる。 In the muffler structure for a saddle-riding type vehicle, the
According to this configuration, the front portion of the
この場合、走行風に乱流を生じさせる突起71をマフラー42の外周に複数配置するので、マフラー42の外周全体にわたって乱流を発生させて走行風の巻き込みを抑え、排気効率への影響をより抑えることができる。 In the muffler structure for a saddle-ride type vehicle, a plurality of the
In this case, since a plurality of
図15~図17を参照し、本実施形態の変形例について説明する。この変形例は、上記実施形態に対し、走行風に乱流を生じさせるための突起71を、マフラー本体43ではなくマフラーカバー51の外面に設ける点で特に異なる。その他の、前記実施形態と同一構成には同一符号を付して詳細説明は省略する。 <Modification>
A modified example of the present embodiment will be described with reference to FIGS. This modified example is particularly different from the above-described embodiment in that a
この構成によれば、マフラー本体43の外側に取り付けられるマフラーカバー51の外面に、走行風の乱流を生じさせる突起71を備えるので、マフラー42の最外面を流れる走行風の剥離を遅らせる効果を得る。このため、マフラー42の後端位置での走行風の巻き込みを効果的に抑えることができる。 In the muffler structure for a saddle-ride type vehicle in the above modification, the
According to this configuration, since the
次に、本発明の第二実施形態について、図18~図21を参照して説明する。
この実施形態は、前記第一実施形態に対して、ステップフロアおよび跨ぎ空間を有するスクーター型車両ではなく、シート前方にニーグリップ部を有するとともに車体両側にバータイプのステップを有するスポーツタイプの自動二輪車に適用する点で特に異なる。その他の、前記実施形態と同一構成には同一符号を付して詳細説明は省略する。 <Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS.
This embodiment is different from the first embodiment in that it is not a scooter type vehicle having a step floor and a straddling space, but a sports type motorcycle having a knee grip portion in front of the seat and bar type steps on both sides of the vehicle body. It is especially different in that it is applied to. Other than that, the same components as those of the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
図18に示すように、第二実施形態の自動二輪車101の車体フレームF2は、前端部に位置するヘッドパイプ113と、ヘッドパイプ113から下後方へ延びる左右一対のメインフレーム114と、左右メインフレーム114の後端部から下方へ延びる左右一対のピボットフレーム115と、を備えている。ヘッドパイプ113には、自動二輪車101の前輪WF、左右一対のフロントフォーク11および操向ハンドル12が操向可能に支持されている。左右ピボットフレーム115には、スイングアーム117の前端部が上下揺動可能に支持されている。スイングアーム117の後端部には、自動二輪車101の後輪WRが支持されている。左右メインフレーム114の後部には、シートフレーム116の前端部が連結されている。 <Whole vehicle>
As shown in FIG. 18, the vehicle body frame F2 of the
図18~図21に示すように、マフラー本体143の後部上面(外面)143bには、上面143bから上方に突出する突起71が設けられている。突起71は、第一実施形態の突起71と同様、マフラー本体143の外面143bに沿って流れる走行風に規定の乱流(渦流)を生じさせるための渦流生成器として機能する。すなわち、突起71により意図的に小さな乱流を生じさせることで、マフラー本体143の後端後方における気流を制御し、マフラー142の空気抵抗を減らす等の効果を得る。また、突起71は、走行風の剥離を抑える(遅らせる)ことで、マフラー142後端の排気口149aに対する走行風の巻き込みの影響を抑制し、排気効率を良好に維持する。 <Muffler protrusion structure>
As shown in FIGS. 18 to 21, the rear upper surface (outer surface) 143b of the
次に、本発明の第三実施形態について、図22~図25を参照して説明する。
この実施形態は、前記第一実施形態に対して、スイングユニットを有するスクーター型車両ではなく、エンジンを車体に支持したビジネスタイプの自動二輪車に適用する点で特に異なる。その他の、前記実施形態と同一構成には同一符号を付して詳細説明は省略する。 <Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS.
This embodiment is different from the first embodiment in that it is applied not to a scooter type vehicle having a swing unit but to a business type motorcycle having an engine supported on a vehicle body. Other than that, the same components as those of the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
図22に示すように、第三実施形態の自動二輪車(鞍乗り型車両)201は、所謂アンダーボーン型の車体フレームF3を備えることで、車体の跨り易さを向上させ、かつ車両の低重心化を図っている。 <Whole vehicle>
As shown in FIG. 22, a motorcycle (saddle-riding type vehicle) 201 of the third embodiment is provided with a so-called underbone type body frame F3 to improve the ease of straddling the vehicle body and lower the center of gravity of the vehicle. It is trying to make it.
図22~図25に示すように、マフラー本体243の後部上面(外面)243bには、上面243bから上方に突出する突起71が設けられている。突起71は、第一実施形態の突起71と同様、マフラー本体243の外面243bに沿って流れる走行風に規定の乱流(渦流)を生じさせるための渦流生成器として機能する。すなわち、突起71により意図的に小さな乱流を生じさせることで、マフラー本体243の後端後方における気流を制御し、マフラー242の空気抵抗を減らす等の効果を得る。また、突起71は、走行風の剥離を抑える(遅らせる)ことで、マフラー242後端の排気口249aに対する走行風の巻き込みの影響を抑制し、排気効率を良好に維持する。 <Muffler protrusion structure>
As shown in FIGS. 22 to 25, a
前記鞍乗り型車両には、運転者が車体を跨いで乗車する車両全般が含まれ、自動二輪車(原動機付自転車及びスクーター型車両を含む)のみならず、三輪(前一輪かつ後二輪の他に、前二輪かつ後一輪の車両も含む)又は四輪の車両も含まれる。
そして、上記実施形態における構成は本発明の一例であり、実施形態の構成要素を周知の構成要素に置き換える等、本発明の要旨を逸脱しない範囲で種々の変更が可能である。 The present invention is not limited to the above embodiment, and the
The saddle-riding type vehicle includes all vehicles that a driver rides across the vehicle body, and includes not only motorcycles (including a motorized bicycle and a scooter type vehicle) but also three wheels (one front wheel and two rear wheels). , Including two front wheels and one rear wheel) or four wheels.
The configurations in the above embodiments are examples of the present invention, and various modifications can be made without departing from the scope of the present invention, such as replacing the components of the embodiments with known components.
E エンジン(内燃機関)
42 マフラー(消音器)
43 マフラー本体(消音器本体)
ct1 中央位置
43b 上面、外面
46 エンドキャップ
49a 排気口
51 マフラーカバー(カバー部材)
71 突起
Y1 突起長手方向の寸法
X1,Z1 突起長手方向と直交する方向の寸法
Zt 突出頂部 1 motorcycle (saddle-type vehicle)
E engine (internal combustion engine)
42 Muffler (silencer)
43 Muffler body (silencer body)
ct1
71 Protrusion Y1 Dimension in the longitudinal direction of the protrusion X1, Z1 Dimension in the direction orthogonal to the longitudinal direction of the protrusion Zt Projection top
Claims (10)
- 内燃機関(E)から排出された排気の消音を行う消音器(42)を備える鞍乗り型車両(1)の消音器構造において、
前記消音器(42)は、その外面(43b)から突出して前記外面(43b)に沿って流れる走行風に規定の乱流を生じさせるための突起(71)を備えている鞍乗り型車両の消音器構造。 A silencer structure for a saddle-ride type vehicle (1) comprising a silencer (42) for silencing exhaust gas discharged from an internal combustion engine (E),
In the saddle-ride type vehicle, the silencer (42) includes a protrusion (71) that projects from the outer surface (43b) of the silencer (42) to generate a predetermined turbulent flow in the traveling wind flowing along the outer surface (43b). Silencer structure. - 前記消音器(42)は、消音器本体(43)と、前記消音器本体(43)に取り付けられるカバー部材(51)と、を備え、
前記突起(71)は、前記消音器本体(43)およびカバー部材(51)の少なくとも一方に設けられている請求項1に記載の鞍乗り型車両の消音器構造。 The silencer (42) includes a silencer body (43) and a cover member (51) attached to the silencer body (43),
The silencer structure for a saddle-ride type vehicle according to claim 1, wherein the protrusion (71) is provided on at least one of the silencer body (43) and the cover member (51). - 前記消音器本体(43)は、後端部に位置するエンドキャップ(46)と、前記エンドキャップ(46)に配置されて排気を大気に放出する排気口(49a)と、を有し、
前記カバー部材(51)および前記エンドキャップ(46)の少なくとも一方は、前記排気口(49a)よりも後方に延びている請求項2に記載の鞍乗り型車両の消音器構造。 The muffler body (43) has an end cap (46) located at a rear end portion, and an exhaust port (49a) disposed in the end cap (46) for discharging exhaust gas to the atmosphere.
The silencer structure for a saddle type vehicle according to claim 2, wherein at least one of the cover member (51) and the end cap (46) extends rearward of the exhaust port (49a). - 前記突起(71)は、前記消音器(42)の長手方向において、前記消音器(42)の中央位置(ct1)より後方に設けられている請求項1から3の何れか一項に記載の鞍乗り型車両の消音器構造。 4. The protrusion (71) according to claim 1, wherein the protrusion (71) is provided rearward of a central position (ct1) of the silencer (42) in the longitudinal direction of the silencer (42). Muffler structure for saddle type vehicles.
- 前記突起(71)は、車両前後方向を向く突起長手方向を有し、前記突起長手方向の寸法(Y1)が前記突起長手方向と直交する方向の寸法(X1,Z1)よりも大きい請求項1から4の何れか一項に記載の鞍乗り型車両の消音器構造。 The said protrusion (71) has a protrusion longitudinal direction which faces the vehicle front-back direction, and the dimension (Y1) of the said protrusion longitudinal direction is larger than the dimension (X1, Z1) of the direction orthogonal to the said protrusion longitudinal direction. 5. The silencer structure for a saddle-ride type vehicle according to any one of items 1 to 4.
- 前記突起(71)は、前記突起長手方向と直交する側面視で突出頂部(Zt)を有する山形をなし、
前記突起(71)の車両前後方向前側には、突起前端部から突出頂部(Zt)に向けて高くなる前側傾斜部を有し、
前記突起(71)の車両前後方向後側には、前記突出頂部(Zt)から突起後端部に向けて低くなる後側傾斜部を有している請求項5に記載の鞍乗り型車両の消音器構造。 The protrusion (71) has a mountain shape having a protruding apex (Zt) in a side view orthogonal to the longitudinal direction of the protrusion,
On the front side in the vehicle front-rear direction of the protrusion (71), there is a front-side inclined portion that becomes higher from the front end portion of the protrusion toward the protruding top portion (Zt),
The saddle-riding type vehicle according to claim 5, further comprising a rearward sloped portion on the rear side of the protrusion (71) in the vehicle front-rear direction, the rearward inclined portion being lowered from the protruding top (Zt) toward the rear end of the protrusion. Silencer structure. - 前記前側傾斜部は、前記後側傾斜部よりも前記突起長手方向で長い請求項6に記載の鞍乗り型車両の消音器構造。 The silencer structure for a saddle-ride type vehicle according to claim 6, wherein the front sloped portion is longer in the protrusion longitudinal direction than the rear sloped portion.
- 前記後側傾斜部は、前記前側傾斜部よりも前記突起長手方向で長い請求項6に記載の鞍乗り型車両の消音器構造。 The silencer structure for a saddle-ride type vehicle according to claim 6, wherein the rear sloped portion is longer in the projection longitudinal direction than the front sloped portion.
- 前記突起(71)は、前記消音器(42)の外周に複数配置されている請求項1から8の何れか一項に記載の鞍乗り型車両の消音器構造。 The silencer structure for a saddle-ride type vehicle according to any one of claims 1 to 8, wherein a plurality of the protrusions (71) are arranged on the outer periphery of the silencer (42).
- 前記消音器(42)は、消音器本体(43)と、前記消音器本体(43)の外側に取り付けられるカバー部材(51)と、を備え、
前記突起(71)は、前記カバー部材(51)に設けられている請求項1から9の何れか一項に記載の鞍乗り型車両の消音器構造。 The silencer (42) includes a silencer body (43) and a cover member (51) attached to the outside of the silencer body (43),
The silencer structure for a saddle-ride type vehicle according to any one of claims 1 to 9, wherein the protrusion (71) is provided on the cover member (51).
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19916011.0A EP3929413A4 (en) | 2019-02-21 | 2019-02-21 | Silencer structure for saddled vehicle |
BR112021016453-7A BR112021016453A2 (en) | 2019-02-21 | 2019-02-21 | SADDLE MOUNT TYPE VEHICLE MUFFLER STRUCTURE |
PCT/JP2019/006501 WO2020170381A1 (en) | 2019-02-21 | 2019-02-21 | Silencer structure for saddled vehicle |
JP2021501221A JP7146057B2 (en) | 2019-02-21 | 2019-02-21 | Saddle type vehicle muffler structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2019/006501 WO2020170381A1 (en) | 2019-02-21 | 2019-02-21 | Silencer structure for saddled vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020170381A1 true WO2020170381A1 (en) | 2020-08-27 |
Family
ID=72143422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2019/006501 WO2020170381A1 (en) | 2019-02-21 | 2019-02-21 | Silencer structure for saddled vehicle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3929413A4 (en) |
JP (1) | JP7146057B2 (en) |
BR (1) | BR112021016453A2 (en) |
WO (1) | WO2020170381A1 (en) |
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JPH07259531A (en) * | 1994-03-28 | 1995-10-09 | Calsonic Corp | Muffler |
JP2005155551A (en) * | 2003-11-27 | 2005-06-16 | Toyota Motor Corp | Muffler |
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JP2012241639A (en) * | 2011-05-20 | 2012-12-10 | Honda Motor Co Ltd | Muffler structure for straddle-type vehicle |
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JP4400823B2 (en) | 2004-06-01 | 2010-01-20 | 本田技研工業株式会社 | Muffler device for motorcycles |
JP2012254750A (en) * | 2011-06-10 | 2012-12-27 | Yamaha Motor Co Ltd | Muffler protector and saddle-ride type vehicle |
JP5867852B2 (en) | 2011-09-21 | 2016-02-24 | 本田技研工業株式会社 | Muffler device with protector for small vehicles |
JP5828390B2 (en) * | 2011-09-28 | 2015-12-02 | 本田技研工業株式会社 | Muffler for small vehicles |
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2019
- 2019-02-21 JP JP2021501221A patent/JP7146057B2/en active Active
- 2019-02-21 EP EP19916011.0A patent/EP3929413A4/en not_active Withdrawn
- 2019-02-21 WO PCT/JP2019/006501 patent/WO2020170381A1/en unknown
- 2019-02-21 BR BR112021016453-7A patent/BR112021016453A2/en unknown
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JPS52846U (en) * | 1975-06-23 | 1977-01-06 | ||
JPH07259531A (en) * | 1994-03-28 | 1995-10-09 | Calsonic Corp | Muffler |
JP2005155551A (en) * | 2003-11-27 | 2005-06-16 | Toyota Motor Corp | Muffler |
JP2006017046A (en) * | 2004-07-02 | 2006-01-19 | Honda Motor Co Ltd | Muffler device |
JP2006077609A (en) * | 2004-09-07 | 2006-03-23 | Kanto Auto Works Ltd | Muffler structure of automobile |
JP2009264293A (en) | 2008-04-25 | 2009-11-12 | Yamaha Motor Co Ltd | Vehicle and muffler protector unit |
JP2012241639A (en) * | 2011-05-20 | 2012-12-10 | Honda Motor Co Ltd | Muffler structure for straddle-type vehicle |
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See also references of EP3929413A4 |
Also Published As
Publication number | Publication date |
---|---|
EP3929413A4 (en) | 2022-03-02 |
EP3929413A1 (en) | 2021-12-29 |
JP7146057B2 (en) | 2022-10-04 |
BR112021016453A2 (en) | 2021-10-13 |
JPWO2020170381A1 (en) | 2021-12-09 |
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