CN103835786B

CN103835786B - Silencing apparatus and Straddle riding type vehicle

Info

Publication number: CN103835786B
Application number: CN201310613294.0A
Authority: CN
Inventors: 藤中崇
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 2012-11-27
Filing date: 2013-11-27
Publication date: 2016-03-02
Anticipated expiration: 2033-11-27
Also published as: PH12013000358A1; EP2735715A1; BR102013030564A2; BR102013030564B1; CN103835786A; ES2546634T3; PH12013000358B1; JP2014105617A; EP2735715B1

Abstract

The invention provides the silencing apparatus that fully can reduce the heat affecting that catalyzer produces and the Straddle riding type vehicle comprising this silencing apparatus.Straddle riding type vehicle (10) comprises motor (14) and silencing apparatus (44).Silencing apparatus comprises outlet pipe (46), silencing apparatus (48) and catalyzer (52).Silencing apparatus comprises main part (68), the first dividing plate (70) and second partition (72).In main part, be provided with the first expansion chamber (X1) at the rear of second partition, be provided with the second expansion chamber (X2) in the front of the first dividing plate, between the first dividing plate and second partition, be provided with the 3rd expansion chamber (X3).Catalyzer is held in outlet pipe in the second expansion chamber.Outlet pipe is not to pass through through hole (70a) with the mode of the first baffle contacts and to be supported in second partition.Discharge from main part after outlet pipe, the first expansion chamber, the second expansion chamber, the 3rd expansion chamber are flow through in the exhaust of motor successively.

Description

Silencing apparatus and Straddle riding type vehicle

Technical field

The present invention relates to silencing apparatus and Straddle riding type vehicle, particularly relate to property the silencing apparatus with catalyzer and the Straddle riding type vehicle comprising silencing apparatus.

Background technique

At present, there will be a known the silencing apparatus had the catalyzer that the exhaust of motor purifies.

Such as, in the muffler configuration described in Japanese Unexamined Patent Publication 2007-23866 publication, in muffler body, separate into the first expansion chamber, the second expansion chamber and the 3rd expansion chamber by the first dividing plate and second partition.Second partition is supported in muffler body movably along the axle direction of muffler body.First expansion chamber is set to be clamped by the second expansion chamber and the 3rd expansion chamber.

Motor is communicated with via outlet pipe with the first expansion chamber.First expansion chamber is communicated with via the connecting tube being supported in the first dividing plate with the second expansion chamber.Second expansion chamber is communicated with the primary catalyst of second partition via being supported in the first dividing plate with the 3rd expansion chamber.3rd expansion chamber is via tail pipe and ft connection.

In structure as described above, after the exhaust of motor flows in the first expansion chamber via outlet pipe, flow into the second expansion chamber via connecting tube.The exhaust flowed into the second expansion chamber flows into the 3rd expansion chamber via primary catalyst, then, is discharged to the outside via tail pipe.

Record a kind of technology in Japanese Unexamined Patent Publication 2007-23866 publication, moved by second partition, the stretching, extension of each component parts caused by thermal expansion can be absorbed.But in the muffler configuration of Japanese Unexamined Patent Publication 2007-23865 publication, primary catalyst is directly supported by the first dividing plate and second partition, therefore, the impact that the heat that fully can not reduce primary catalyst generation causes the first dividing plate and second partition.

Summary of the invention

Therefore, main purpose of the present invention is, provides a kind of and fully can reduce the silencing apparatus of the heat affecting produced by catalyzer and comprise the Straddle riding type vehicle of this silencing apparatus.

According to certain aspect of the present invention, provide a kind of silencing apparatus of Straddle riding type vehicle, it has the catalyzer purified engine exhaust, comprising: the main part of the barrel shape extended on the fore-and-aft direction of this silencing apparatus, first dividing plate and second partition, it is arranged in main part, will be divided into the first expansion chamber, the second expansion chamber and the 3rd expansion chamber in main part, outlet pipe, it extends in main part from front to back in the mode of through first dividing plate and second partition, first dividing plate is arranged on more closer to the front than second partition, the rear of second partition is provided with the first expansion chamber, in main part, the space in second partition front is become the second expansion chamber and the 3rd expansion chamber by the first separator lined, ratio first dividing plate of catalyzer in main part position closer to the front is arranged in outlet pipe, first dividing plate has by the through through hole of outlet pipe, outlet pipe is not to be supported in second partition by through hole with the mode of the first baffle contacts, exhaust flows through outlet pipe successively, first expansion chamber, after second expansion chamber and the 3rd expansion chamber, be discharged to main part outside.

In the present invention, catalyzer is arranged on more closer to the front than the first dividing plate.That is, catalyzer can be set in the position as far as possible near motor.In this case, high-temperature exhaust air can be supplied in catalyzer, therefore, it is possible to the activate of promoting catalyst efficiently.In addition, the exhaust that have passed catalyzer is led the outlet pipe of the first expansion chamber with the not through hole of through first dividing plate with the mode of the first baffle contacts.Thus, even if when outlet pipe is owing to expanding by the high-temperature exhaust air after catalyzer, also can prevent the impact of this thermal expansion from feeding through to the first dividing plate.In addition, outlet pipe is supported by second partition.At this, second partition is arranged on more more rearward than the first dividing plate.In other words, on the circulating direction of the exhaust in outlet pipe, second partition is arranged on than the first dividing plate side farther downstream.Therefore, flow through in the exhaust in outlet pipe, the delivery temperature near second partition is lower than the delivery temperature near the first dividing plate.Therefore, in outlet pipe, the thermal expansion of the part supported by second partition is less than the thermal expansion of the part near the first dividing plate.Therefore, even if utilize second partition to support outlet pipe, second partition also can not be subject to the impact of the thermal expansion of outlet pipe significantly.These results, the impact that the heat that fully can reduce catalyzer generation causes silencing apparatus (more specifically, the first dividing plate and second partition).In addition, in this silencing apparatus, the through hole be vented via the first dividing plate flows from the second expansion chamber to the 3rd expansion chamber.More specifically, in through hole, be vented in the space outside outlet pipe and flow.Now, utilize the exhaust cooled exhaust pipe outer circumferential face flow through outside outlet pipe, therefore, it is possible to reduce the delivery temperature in outlet pipe.Thus, in the exhaust of exhaust Bottomhole pressure, the delivery temperature near second partition can be reduced efficiently.

Preferred: outlet pipe comprises the holding part keeping catalyzer and the fixing part being fixed on second partition, and holding part is connected with fixing part in the mode can slided in the longitudinal direction relative to fixing part.In this formation, the heat produced due to catalyzer in holding part and when expanding, holding part can be slided in the longitudinal direction relative to fixing part.Thereby, it is possible to suppress fixing part to move in the longitudinal direction due to the impact of the thermal expansion of holding part.Its result, can suppress the impact of the thermal expansion of holding part to feed through to second partition.

In addition, preferred: holding part and fixing part connect between the first dividing plate and second partition.In this formation, holding part is connected with the rear of fixing part at the first dividing plate.In this case, can shorten the length of fixing part, therefore, the assembling of silencing apparatus becomes easy.

Further preferably: holding part is connected with the front of fixing part at the first dividing plate.In this formation, protect and treat that portion is connected with the position that fixing part is fully leaving second partition.In this case, the length of fixing part, therefore, utilizes fixing part also can alleviate the impact of the thermal expansion of holding part.Such as, in holding part on direction, footpath during thermal expansion, even if the front end of fixing part (with the joint of holding part) is expanded on direction, footpath due to holding part, when the length of fixing part is longer, the rear portion side of fixing part (second partition side) also can be suppressed to expand on direction, footpath.Thereby, it is possible to fully suppress the impact of the thermal expansion of holding part to feed through to second partition.

Preferred: the first connecting tube also comprising connection second expansion chamber and the 3rd expansion chamber, the first connecting tube is by the through hole of the first dividing plate and be supported in the first dividing plate, outlet pipe in the mode do not contacted with the first connecting tube by the first connecting tube.In this formation, exhaust can be flow through from the second expansion chamber to the 3rd expansion chamber via the first connecting tube.Thereby, it is possible to make the pressure of exhaust reliably change, therefore, the erasure effect of silencing apparatus improves.In addition, because outlet pipe does not contact with the first connecting tube, therefore, it is possible to prevent the impact of the thermal expansion of outlet pipe from feeding through to the first dividing plate via the first connecting tube.

In addition, preferred: the first connecting tube also comprising connection second expansion chamber and the 3rd expansion chamber, the first connecting tube was supported in the first dividing plate in the position leaving described through hole.In this formation, on the basis of the through hole (through hole that outlet pipe passes through) of the first dividing plate, exhaust can also be flow through from the second expansion chamber to the 3rd expansion chamber via the first connecting tube.That is, in the first dividing plate, by exhaust channel setting two positions from the second expansion chamber to the 3rd expansion chamber.In this case, the exhaust of the path flowing through these two positions can be utilized to cool the first dividing plate.Thereby, it is possible to fully suppress the heat affecting of the exhaust flow through in outlet pipe to feed through to the first dividing plate.

Further preferably: also comprise: the second connecting tube being communicated with the first expansion chamber and the second expansion chamber; With the third connecting pipe being communicated with the 3rd expansion chamber and main part outside, second expansion chamber is arranged at the front of the first dividing plate, 3rd expansion chamber is arranged at the rear of the first dividing plate, second connecting tube through first dividing plate and second partition and be supported in the first dividing plate and second partition, the through second partition of third connecting pipe and be supported in second partition.In this formation, first expansion chamber at second partition rear utilized for the second connecting tube be communicated with second expansion chamber in the first dividing plate front.In other words, the second connecting tube was communicated with the first expansion chamber and the second expansion chamber by the 3rd expansion chamber.At this, the delivery temperature of the 3rd expansion chamber is than lower by the delivery temperature of the second connecting tube.Thereby, it is possible to utilize the exhaust of the 3rd expansion chamber to cool exhaust in the second connecting tube.In addition, exhaust can be flow through from the first expansion chamber to the second expansion chamber via the second connecting tube, therefore, it is possible to make the pressure of exhaust reliably change.Thus, the erasure effect of silencing apparatus improves.

Preferred: also to comprise: the second connecting tube being communicated with the first expansion chamber and the second expansion chamber; With the third connecting pipe being communicated with the 3rd expansion chamber and main part outside, second expansion chamber is arranged at the rear of the first dividing plate, 3rd expansion chamber is arranged at the front of the first dividing plate, second connecting tube through second partition and be supported in second partition, through first dividing plate of third connecting pipe and second partition and be supported in the first dividing plate and second partition.In this formation, be provided with the 3rd expansion chamber and catalyzer in the front of the first dividing plate, the rear of the first dividing plate is provided with the second expansion chamber.That is, the circulating direction that catalyzer is arranged at exhaust is arranged in the 3rd expansion chamber than the second expansion chamber side farther downstream.In this case, even if the heat that produces due to catalyzer of the delivery temperature of the 3rd expansion chamber and rising, the exhaust that also can prevent this temperature from rising flows in the second expansion chamber.Thereby, it is possible to suppress the temperature of the exhaust of the second expansion chamber to rise.Its result, utilizes the exhaust of the second expansion chamber, can effectively cool the exhaust flow through in outlet pipe.In addition, exhaust can be flow through from the first expansion chamber to the second expansion chamber via the second connecting tube, therefore, it is possible to make the pressure of exhaust reliably change.Thus, the erasure effect of silencing apparatus improves.

Also preferred: catalyzer is arranged on more closer to the front than the first connecting tube, the second connecting tube and third connecting pipe.In this formation, when observing this silencing apparatus from the direction at a right angle with fore-and-aft direction (such as, observing silencing apparatus from side or above-below direction), catalyzer can not be overlapping with the first connecting tube, the second connecting tube and third connecting pipe.Thus, even if such as when using thick catalyzer (catalyzer that diameter is larger), silencing apparatus also can be suppressed thicker.

In the silencing apparatus being equipped on Straddle riding type vehicle, sometimes in each component parts, produce distortion etc. due to the impact of the heat of catalyzer generation.In this case, the erasure effect of silencing apparatus declines, or produces noise due to the distortion etc. of each component parts.Therefore, in the silencing apparatus being equipped on Straddle riding type vehicle, preferably alleviate the heat affecting that catalyzer produces as far as possible.Therefore, it is possible to the silencing apparatus of the present invention fully reducing the heat affecting that catalyzer produces can be applicable to Straddle riding type vehicle.

Above-mentioned purpose of the present invention and other object, feature, aspect and advantage will become brighter and clearer by the detailed description of following embodiments of the present invention of carrying out relevant to accompanying drawing.

Accompanying drawing explanation

Fig. 1 is the side view representing Straddle riding type vehicle.

Fig. 2 is the side view of the structure of the major component representing Straddle riding type vehicle.

Fig. 3 is the cross section schematic thinking (figure from left sides) of the structure of the major component representing silencing apparatus.

Fig. 4 is the cross section schematic thinking (figure from top view) of the structure of the major component representing silencing apparatus.

Fig. 5 is the end view drawing representing silencing apparatus, and Fig. 5 (a) is the A-A line end view drawing of Fig. 3 and Fig. 4, and Fig. 5 (b) is the B-B line end view drawing of Fig. 3 and Fig. 4, and Fig. 5 (c) is the C-C line end view drawing of Fig. 3 and Fig. 4.

Fig. 6 is the cross section schematic thinking (figure from left sides) of the structure of the major component of the silencing apparatus representing another embodiment of the present invention.

Fig. 7 is the cross section schematic thinking (figure from top view) of the structure of the major component of the silencing apparatus representing another embodiment of the present invention.

Fig. 8 is the cross section schematic thinking (figure from left sides) of the structure of the major component of the silencing apparatus representing another embodiment of the invention.

Fig. 9 is the cross section schematic thinking (figure from left sides) of the structure representing the major component of the silencing apparatus of another mode of execution more of the present invention.

Description of reference numerals

10: Straddle riding type vehicle;

12: framework;

14: motor;

20: exhaust unit;

44,44a, 44b, 44c: silencing apparatus;

46,86: outlet pipe;

46a, 86a: holding part;

46b, 86b: fixing part;

48,48a, 48b: silencing apparatus;

50,78: tail pipe;

52: catalyzer;

68: main part;

70,80,84: the first dividing plates;

70a, 70b, 72a, 72b, 72c, 80a: through hole;

72: second partition;

74, the 74a: the first connecting tube;

76,82: the second connecting tube;

X1: the first expansion chamber;

X2, Y2, Z2: the second expansion chamber;

X3, Y3, Z3: the 3rd expansion chamber.

Embodiment

Below, be described with reference to the Straddle riding type vehicle 10 of accompanying drawing to the silencing apparatus 44 comprising an embodiment of the present invention.

Fig. 1 is the side view representing Straddle riding type vehicle 10, and Fig. 2 is the side view of the structure of the major component representing Straddle riding type vehicle 10.

See figures.1.and.2, the Straddle riding type vehicle 10 as automotive bicycle comprises: framework 12, motor 14, air cleaner 16, air admission unit 18 and exhaust unit 20.Framework 12 comprises: head tube 22, main frame portion 24 and seat frame portion 26.

With reference to Fig. 1, steering shaft 28 is rotatably inserted in head tube 22.In the upper end portion of steering shaft 28, handlebar 30 is installed, and in the underpart of steering shaft 28, front fork 32 is installed.Front-wheel 34 is rotatably supported in the underpart of front fork 32.

See figures.1.and.2, main frame portion 24 comprises main frame portion 24a and lower main frame portion 24b.Upper main frame portion 24a has roughly L-shaped shape when side is seen, from head tube 22 after below extension of retreading, bend downwards.Lower main frame portion 24b than upper main frame portion 24a more on the lower, extends from head tube 22 to below of retreading.Motor 14 is supported in main frame portion 24a and lower main frame portion 24b between upper main frame portion 24a and lower main frame portion 24b.

With reference to Fig. 1, swing arm 36 is supported in the underpart of main frame portion 24a swingably.Trailing wheel 38 is rotatably supported in the rearward end of swing arm 36.The driving force produced in motor 14 is passed to trailing wheel 38 via not shown transfer mechanism.Thus, trailing wheel 38 rotates, and Straddle riding type vehicle 10 advances thus.

See figures.1.and.2, seat frame portion 26 comprise left and right configuration a pair seat frame section 26a(only illustrate left side seat frame section 26a) and left and right configuration a pair time seat frame portion 26b(only illustrate on the left of lower seat frame portion 26b).The front end of each seat frame section 26a is connected with the substantially central portion of upper main frame portion 24a.A pair seat frame section 26a rearward extends from upper main frame portion 24a in the mode be separated from each other in the lateral direction.With reference to Fig. 1, seat 40 is supported on a pair seat frame section 26a.

See figures.1.and.2, a pair time seat frame portion 26b the below of a pair seat frame section 26a from the bottom of main frame portion 24a extend to oblique back upper place.The bottom of main frame portion 24a and the rear portion of a pair seat frame section 26a in a pair time seat frame portion 26b link.Air cleaner 16 is supported in the seat frame section 26a of a side (in this mode of execution, left side) and the lower seat frame portion 26b of a side (in this mode of execution, left side).To link the mode of a pair time seat frame portion 26b and swing arm 36, be provided with in a pair rear suspension 41(Fig. 1, only illustrate the rear suspension 41 in left side).

The mode linking motor 14 and air cleaner 16 is provided with air admission unit 18.Air admission unit 18 comprises throttle body 18a, by the air guided engine 14 be cleaned in air cleaner 16.

Be connected with exhaust unit 20 before motor 14.Exhaust unit 20 comprises connecting pipe 42 and silencing apparatus 44.Connecting pipe 42 links motor 14 and silencing apparatus 44.Silencing apparatus 44 is supported in a pair time seat frame portion 26b.The exhaust of motor 14 is discharged to the outside by connecting pipe 42 and silencing apparatus 44.In this embodiment, as motor 14, can single-cylinder engine be used, as connecting pipe 42,1 tubing can be used.When use multicylinder engine as motor 14, such as, as connecting pipe 42, can gas exhaust manifold be used.

Below, silencing apparatus 44 is described in detail.

Fig. 3 and Fig. 4 is the cross section schematic thinking of the structure of the major component representing silencing apparatus 44.In addition, Fig. 3 be from the figure from left sides silencing apparatus 44, Fig. 4 be figure from top view silencing apparatus 44.In addition, Fig. 5 is the end view drawing representing silencing apparatus 44, and Fig. 5 (a) is the A-A line end view drawing of Fig. 3 and Fig. 4, and Fig. 5 (b) is the B-B line end view drawing of Fig. 3 and Fig. 4, and Fig. 5 (c) is the C-C line end view drawing of Fig. 3 and Fig. 4.

In addition, in the explanation of silencing apparatus 44, observe from main part 68 described later, the side that exhaust flows into is set to front, the side that exhaust is flowed out is set to rear.In other words, in main part 68, will outlet pipe 46(second tubing 58 described later be connected) side be set to front side, will connect tail pipe 50(second tubing 50b described later) side be set on rear side of.Further in other words, by main part 68 from outlet pipe 46(second tubing 58) and main part 68(protecgulum 68a) joint extend direction be set to rear.In the present embodiment, fore-and-aft direction is become with the direction of the axis of fixing tubing 64 described later, the axis of urceolus 68b described later and the axis being parallel of the first connecting tube 74 described later.In the present embodiment, fix tubing 64, urceolus 68b and arranged in parallel to each other the first connecting tube 74.In figs. 3 and 4, " F " represents front, and " R " represents rear.When overlooking viewing, the fore-and-aft direction of silencing apparatus 44 is consistent with the fore-and-aft direction of Straddle riding type vehicle 10 or roughly consistent.

With reference to Fig. 2 ~ Fig. 4, silencing apparatus 44 comprises outlet pipe 46, silencing apparatus 48, tail pipe 50(with reference to Fig. 3,4) and catalyzer 52.To cover the mode at tail pipe 50 rear portion, lid 54(is installed with reference to Fig. 2 in the rearward end of silencing apparatus 48).In this embodiment, tail pipe 50 is equivalent to third connecting pipe.

With reference to Fig. 3 and Fig. 4, outlet pipe 46 comprises holding part 46a and fixing part 46b, extends from front to back in main part 68 described later.Holding part 46a comprises multiple tubing.In this embodiment, holding part 46a comprises the first tubing 56, second tubing 58, the 3rd tubing 60 and the 4th tubing 62.First tubing 56, second tubing 58, the 3rd tubing 60 and the 4th tubing 62 have drum respectively.

With reference to Fig. 2, the front end of the first tubing 56 is connected with connecting pipe 42.With reference to Fig. 2 and Fig. 4, the first tubing 56 extends to oblique right back after rearward extending from connecting pipe 42.

With reference to Fig. 3 and Fig. 4, the front end of the second tubing 58 is connected with the rearward end of the first tubing 56.In the present embodiment, the first tubing 56 is embedded in the second tubing 58, such as, by being welded and fixed the first tubing 56 and the second tubing 58.The diameter that second tubing 58 is formed as rearward end is larger than the diameter of front end.The front end of catalyzer 52 is embedded in the rearward end of the second tubing 58.As catalyzer 52, known various catalyzer can be used, therefore, omit detailed description.In the present embodiment, as catalyzer 52, such as, drum can be used and the catalyzer of honeycomb shape.

The diameter that 3rd tubing 60 is formed as front end is larger than the diameter of rearward end.The rearward end of catalyzer 52 is embedded in the front end of the 3rd tubing 60.Thus, the second tubing 58 and the 3rd tubing 60 is utilized to keep catalyzer 52.That is, holding part 46a is utilized to keep catalyzer 52.More specifically, catalyzer 52 is held in holding part 46a in the mode of the front portion being positioned at silencing apparatus 48 (main part 68).In the present embodiment, such as by welding, catalyzer 52 is fixed on the second tubing 58 and the 3rd tubing 60.With reference to Fig. 4, the second tubing 58, catalyzer 52 and the 3rd tubing 60 are from front to back and extend to oblique right direction.Second tubing 58 is communicated with via catalyzer 52 with the 3rd tubing 60.

With reference to Fig. 3 and Fig. 4, the front end of the 4th tubing 62 is connected with the rearward end of the 3rd tubing 60.In the present embodiment, the 4th tubing 62 is embedded in the 3rd tubing 60, such as, by being welded and fixed the 3rd tubing 60 and the 4th tubing 62.With reference to Fig. 4, the 4th tubing 62, rearward bends from the 3rd tubing 60 after the extension of oblique right back.The diameter that 4th tubing 62 is formed as rearward end is less than the diameter of other parts.

Fixing tubing 64 and lid 66 is comprised with reference to Fig. 3 and Fig. 4, fixing part 46b.Fixing tubing 64 has drum, is connected with the rearward end of the 4th tubing 62.More specifically, the mode that the 4th tubing 62 and fixing tubing 64 can slide relative to fixing tubing 64 in the longitudinal direction with the 4th tubing 62 is connected.In the present embodiment, the rearward end of the 4th tubing 62 is embedded in the front end of fixing tubing 64 slidably.

Fixing tubing 64 rearward extends from the 4th tubing 62 and is fixed on second partition 72 described later.With reference to Fig. 3 and Fig. 5 (b), in the present embodiment, in order to the 4th tubing 62 being easily embedded in fixing tubing 64, the internal diameter of fixing tubing 64 front end is larger than the external diameter of the rearward end of the 4th tubing 62.

With reference to Fig. 3 and Fig. 4, fixing tubing 64 has with the multiple through hole 64a arranged along the mode of fore-and-aft direction and circumferential direction arrangement.Multiple through hole 64a is arranged at the rear of second partition 72 described later.In other words, multiple through hole 64a is arranged in the first expansion chamber X1 described later.

Lid 66 has roughly circular plate shape, and is embedded in the rearward end of fixing tubing 64 in the mode of the open rearward end blocking fixing tubing 64.Lid 66 is such as by being fixedly welded on the rearward end of fixing tubing 64.

Silencing apparatus 48 comprises main part 68, first dividing plate 70, second partition 72, first connecting tube 74 and the second connecting tube 76.Main part 68 has barrel shape and extends in the longitudinal direction.Specifically, main part 68 has protecgulum 68a, urceolus 68b, inner core 68c, end cap 68d and inner cap 68e.

Protecgulum 68a has hollow roughly truncated cone shape, and is formed as along with rearward going and expands gradually.The front end of protecgulum 68a is connected with the front end of the second tubing 58 of outlet pipe 46.In the present embodiment, the front end of the second tubing 58 is embedded in the front end of protecgulum 68a, such as, by being welded and fixed the second tubing 58 and protecgulum 68a.Extend to oblique right back from the front end of the second tubing 58 with reference to Fig. 4, protecgulum 68a.

With reference to Fig. 3 ~ Fig. 5, urceolus 68b has hollow substantially cylindrical shape and extends in the longitudinal direction.

With reference to Fig. 2, Fig. 4 and Fig. 5 (b), urceolus 68b fore-and-aft direction substantially central portion and left side has recess 68f.Recess 68f is in order to avoid such as being arranged at trailing wheel 38(with reference to Fig. 1) rear suspension 41 on right side and arranging.Front end with reference to Fig. 3 and Fig. 4, urceolus 68b is connected with the rearward end of protecgulum 68a.In the present embodiment, the rearward end of protecgulum 68a is embedded in the front end of urceolus 68b, such as, by being welded and fixed protecgulum 68a and urceolus 68b.

With reference to Fig. 3, Fig. 4 and Fig. 5 (b), (c), inner core 68c there is hollow cylinder shape and with urceolus 68b coaxial arrange.With reference to Fig. 4 and Fig. 5 (b), the front portion of inner core 68c in order to avoid recess 68f have see overleaf time the word shape of falling C.In this embodiment, inner core 68c is embedded in urceolus 68b, such as, by being welded and fixed urceolus 68b and inner core 68c.

With reference to Fig. 3 and Fig. 4, end cap 68d, there is roughly bowl (bowl) shape and be embedded in the rearward end of urceolus 68b in the mode of the opening blocking urceolus 68b rear end.In the present embodiment, such as by welding, end cap 68d is fixed on urceolus 68b.End cap 68d has for by tail pipe 50(more specifically, the second tubing 50b described later) through hole 68g.In this embodiment, such as, by welding by tail pipe 50(second tubing 50b) be fixed on end cap 68d.Thus, tail pipe 50(second tubing 50b) be supported in end cap 68d.

With reference to Fig. 3, inner cap 68e, there is roughly bowl (bowl) shape and be arranged at the inner side of end cap 68d.In the present embodiment, inner cap 68e is embedded in end cap 68d, such as, by being welded and fixed end cap 68d and inner cap 68e.Inner cap 68e has for by tail pipe 50(second tubing 50b) through hole 68h.

With reference to Fig. 3, Fig. 4 and Fig. 5 (a), the first dividing plate 70 has roughly bowl (bowl) shape and being arranged in urceolus 68b.In the present embodiment, the first dividing plate 70 is embedded in urceolus 68b, such as, by being welded and fixed urceolus 68b and the first dividing plate 70.With reference to Fig. 3 and Fig. 4, at main part 68(more specifically, urceolus 68b) in, second partition 72 is arranged on the position more more rearward than the first dividing plate 70.With reference to Fig. 3, Fig. 4 and Fig. 5 (c), second partition 72 has roughly bowl (bow1) shape and being arranged in inner core 68c.In this embodiment, second partition 72 is embedded in inner core 68c, such as, by being welded and fixed inner core 68c and second partition 72.Therefore, the first dividing plate 70 and second partition 72 can not move (fixing) relative to main part 68.

With reference to Fig. 3 and Fig. 4, in main part 68, be divided into the first expansion chamber X1, the second expansion chamber X2 and the 3rd expansion chamber X3 by the first dividing plate 70 and second partition 72.Specifically, in main part 68, be provided with the first expansion chamber X1 at the rear of second partition 72.In addition, in main part 68, the space in second partition 72 front is divided into the second expansion chamber X2 and the 3rd expansion chamber X3 by the first dividing plate 70.In the present embodiment, in main part 68, the front of the first dividing plate 70 is provided with the second expansion chamber X2, the rear of the first dividing plate 70 is provided with the 3rd expansion chamber X3.

Ratio first dividing plate 70 of catalyzer 52 in main part 68 position closer to the front is arranged in outlet pipe 46.In other words, catalyzer 52 is arranged in outlet pipe 46 in the second expansion chamber X2.

First dividing plate 70 has through hole 70a, 70b, and second partition 72 has through hole 72a, 72b, 72c.First connecting tube 74 is with mode through (through) the through hole 70a of through first dividing plate 70 in the longitudinal direction.With reference to Fig. 3, Fig. 4 and Fig. 5 (a), the first connecting tube 74 had drum, by the right side in main part 68.With reference to Fig. 3 and Fig. 4, be communicated with the second expansion chamber X2 and the 3rd expansion chamber X3 the first connecting tube 74.In the present embodiment, such as by welding, the first connecting tube 74 was fixed on the first dividing plate 70.Thus, the first connecting tube 74 was supported in the first dividing plate 70.First connecting tube 74 was arranged on the position more more rearward than catalyzer 52.The diameter of through hole 70a is less than the internal diameter of the main part 68 of the setting position of the first dividing plate 70.

Outlet pipe 46 with the through through hole 70a(of mode of through first dividing plate 70 and second partition 72 in the longitudinal direction more specifically, the first connecting tube 74) and through hole 72a.More specifically, the 4th tubing 62, by the first connecting tube 74, fixes the through through hole 72a of tubing 64.Outlet pipe 46(the 4th tubing 62) pass through through hole 70a in the mode do not contacted with the first dividing plate 70.With reference to Fig. 5 (a), in the present embodiment, outlet pipe 46(the 4th tubing 62) arrange with the first connecting tube 74 coaxial ground, and in the mode do not contacted with the first connecting tube 74 by the first connecting tube 74, with reference to Fig. 3 and Fig. 4, fixing tubing 64 is such as by being fixedly welded on second partition 72.Thus, outlet pipe 46 is supported in second partition 72.

In the present embodiment, holding part 46a(the 4th tubing 62) and fixing part 46b(fix tubing 64) between the first dividing plate 70 and second partition 72 connect.In other words, holding part 46a is connected in the 3rd expansion chamber X3 with fixing part 46b.

Second connecting tube 76 is with the mode through through hole 70b and through hole 72b of through first dividing plate 70 and second partition 72 in the longitudinal direction.With reference to Fig. 3, Fig. 4 and Fig. 5 (a), the second connecting tube 76 had drum, by the oblique left bottom of the first connecting tube 74.With reference to Fig. 3 and Fig. 4, be communicated with the first expansion chamber X1 and the second expansion chamber X2 the second connecting tube 76.The front portion of the second connecting tube 76 is such as embedded in through hole 72b by the rear portion being fixedly welded on for the first dividing plate 70, second connecting tube 76 in the mode such as can slided in the longitudinal direction relative to second partition 72.Thus, the second connecting tube 76 was supported in the first dividing plate 70 and second partition 72.Second connecting tube 76 was arranged on the position more more rearward than catalyzer 52.

With reference to Fig. 3 and Fig. 4, tail pipe 50 comprises the first tubing 50a, the second tubing 50b and auxiliary tubing 50c, and is communicated with the outside of the 3rd expansion chamber X3 and main part 68.

First tubing 50a, the second tubing 50b and auxiliary tubing 50c have drum respectively.Tail pipe 50 is arranged on the position more more rearward than catalyzer 52.

With reference to Fig. 3, Fig. 4 and Fig. 5 (c), the first tubing 50a and auxiliary tubing 50c coaxial ground are arranged.First tubing 50a and auxiliary tubing 50c is by the oblique upper left side of fixing tubing 64 and by the oblique upper right of the second connecting tube 76.With reference to Fig. 3 and Fig. 4, the size of the fore-and-aft direction of the first tubing 50a is larger than the size of the fore-and-aft direction of auxiliary tubing 50c.First tubing 50a is inserted through auxiliary tubing 50c with its front end and rearward end from the mode that auxiliary tubing 50c is outstanding.In the present embodiment, in order to not form gap respectively between the front-end edge and the outer circumferential face of the first tubing 50a of auxiliary tubing 50c and between the end edge and the outer circumferential face of the first tubing 50a of auxiliary tubing 50c, such as, by welding, the front-end edge of auxiliary tubing 50c and end edge are fixed on the outer circumferential face of the first tubing 50a.

With reference to Fig. 3, the first tubing 50a has multiple through hole 50d.Multiple through hole 50d is arranged in auxiliary tubing 50c.Multiple through hole 50d is same with the through hole 64a of fixing tubing 64, spread configuration on the fore-and-aft direction and circumferential direction of the first tubing 50a.In addition, in Fig. 3, in order to avoid the complexity of accompanying drawing, only figure is shown with a part of through hole 50d in multiple through hole 50d.Between the first tubing 50a and auxiliary tubing 50c also can setting example as sound-absorbing material (not shown), also can not sound-absorbing material be set.

With reference to Fig. 3 and Fig. 4, the first tubing 50a and auxiliary tubing 50c with the through through hole 72c of mode of through second partition 72 in the longitudinal direction.Auxiliary tubing 50c is such as by being fixedly welded on second partition 72.Thus, tail pipe 50(more specifically, the first tubing 50a and auxiliary tubing 50c) be supported in second partition 72.

In this embodiment, the first tubing 50a, auxiliary tubing 50c, fixing tubing 64, first connecting tube 74 and arranged in parallel to each other the second connecting tube 76.

The front end of the second tubing 50b is connected with the rearward end of the first tubing 50a.In this embodiment, the first tubing 50a is embedded in the second tubing 50b, such as, by being welded and fixed the first tubing 50a and the second tubing 50b.After rearward extending from the first tubing 50a with reference to Fig. 3, the second tubing 50b, bending to the oblique rear lower side.Second tubing 50b is with the from front to back and oliquely downward mode of through inner cap 68e and end cap 68d through through hole 68h and through hole 68g.In the present embodiment, such as by welding, the outer circumferential face of the second tubing 50b is connected to end cap 68d, makes in through hole 68g, between the second tubing 50b and end cap 68d, do not form gap.

See figures.1.and.2, in Straddle riding type vehicle 10, the exhaust of motor 14 flows in the outlet pipe 46 of silencing apparatus 44 via connecting pipe 42.With reference to Fig. 3 and Fig. 4, after the exhaust flowing in outlet pipe 46 is cleaned in catalyzer 52, flow in the first expansion chamber X1 from multiple through hole 64a of fixing tubing 64.The exhaust flowing in the first expansion chamber X1 flows in the second expansion chamber X2 by the second connecting tube 76.The exhaust flowing in the second expansion chamber X2 is by flowing in the 3rd expansion chamber X3 between the outer circumferential face of the 4th tubing 62 and the inner peripheral surface of the first connecting tube 74.The exhaust flowing in the 3rd expansion chamber X3 is discharged to the outside of main part 68 by tail pipe 50.

Below, the action effect of Straddle riding type vehicle 10 is described.

In the silencing apparatus 44 of Straddle riding type vehicle 10, catalyzer 52 is arranged on the position more closer to the front than the first dividing plate 70.That is, as far as possible catalyzer 52 can be set near the position of motor 14.In this case, high-temperature exhaust air can be supplied to catalyzer 52, therefore, it is possible to the activate of promoting catalyst 52 efficiently.In addition, the outlet pipe 46 that the exhaust by catalyzer 52 can be directed in the first expansion chamber X1 in the mode do not contacted with the first dividing plate 70 by through hole 70a.Thus, even if when expanding, also can prevent the impact of this thermal expansion from feeding through to the first dividing plate 70 due to high-temperature exhaust air soon after by catalyzer 52 at outlet pipe 46.In addition, outlet pipe 46 is supported by second partition 72.At this, second partition 72 is arranged on the position more more rearward than the first dividing plate 70.In other words, on the circulating direction of the exhaust in outlet pipe 46, second partition 72 is arranged on the position than the first dividing plate 70 side farther downstream.Therefore, in the exhaust flow through in outlet pipe 46, the delivery temperature near second partition 72 is lower than the delivery temperature near the first dividing plate 70.Therefore, in outlet pipe 46, the thermal expansion of the part (in this embodiment, fixing tubing 64) supported by second partition 72 is less than the thermal expansion of the part (in this embodiment, the 4th tubing 62) near the first dividing plate.Therefore, even if utilize second partition 72 to support outlet pipe 46, second partition 72 also can not be subject to the impact of the thermal expansion of outlet pipe 46 significantly.These results, fully can reduce heat that catalyzer 52 produces to silencing apparatus 44(more specifically, the first dividing plate 70 and second partition 72) impact that causes.In addition, in this silencing apparatus 44, the through hole 70a be vented via the first dividing plate 70 flows from the second expansion chamber X2 to the 3rd expansion chamber X3.More specifically, in through hole 70a, be vented in the space outside outlet pipe 46 and flow.In through hole 70a, be vented the direction flow through in the space outside outlet pipe 46 parallel with the circulating direction of the exhaust in outlet pipe 46 (almost parallel).Now, utilize the outer circumferential face of the exhaust cooled exhaust pipe 46 flow through outside outlet pipe, therefore, it is possible to reduce the delivery temperature in outlet pipe 46.That is, the delivery temperature flowing through the space outside outlet pipe 46 is lower than the delivery temperature flow through in outlet pipe 46, therefore, it is possible to utilize the outer circumferential face of the exhaust cooled exhaust pipe 46 in the space flow through outside outlet pipe 46.Thus, flow through in the exhaust in outlet pipe 46, the delivery temperature near second partition 72 can be reduced efficiently.

In silencing apparatus 44, outlet pipe 46 comprises the holding part 46a keeping the catalyzer 52 and fixing part 46b being fixed on second partition 72, and holding part 46a is connected with fixing part 46b in the mode can slided in the longitudinal direction relative to fixing part 46b.Holding part 46a and fixing part 46b arranges in the longitudinal direction.By this structure, the heat produced due to catalyzer 52 at holding part 46a and when expanding, holding part 46a can slide in the longitudinal direction relative to fixing part 46b.Thereby, it is possible to suppress fixing part 46b to move in the longitudinal direction due to the impact of the thermal expansion of holding part 46a.Its result, can suppress the impact of the thermal expansion of holding part 46a to feed through to second partition 72.

In silencing apparatus 44, holding part 46a and fixing part 46b connects between the first dividing plate 70 and second partition 72.In this case, can shorten the length of fixing part 46b, therefore, the assembling of silencing apparatus 44 becomes easy.

In silencing apparatus 44, the first connecting tube 74 is by the through hole 70a of the first dividing plate 70 and be supported in the first dividing plate 70, outlet pipe 46 in the mode do not contacted with the first connecting tube 74 by the first connecting tube 74.In this case, exhaust can be flow through from the second expansion chamber X2 to the 3rd expansion chamber X3 via the first connecting tube 74.Thereby, it is possible to make the pressure of exhaust reliably change, therefore, the erasure effect of silencing apparatus 44 improves.In addition, because outlet pipe 46 does not contact with the first connecting tube 74, therefore, it is possible to prevent the impact of the thermal expansion of outlet pipe 46 from feeding through to the first dividing plate 70 via the first connecting tube 74.

In silencing apparatus 44, the first expansion chamber X1 at second partition 72 rear utilized for the second connecting tube 76 be communicated with the second expansion chamber X2 in the first dividing plate 70 front.In other words, the second connecting tube 76 made the first expansion chamber X1 be communicated with the second expansion chamber X2 by the 3rd expansion chamber X3.At this, the delivery temperature of the 3rd expansion chamber X3 is than low by the delivery temperature of the second connecting tube 76.Thus, the exhaust of the 3rd expansion chamber X3 is utilized can to cool exhaust in the second connecting tube 76.In addition, exhaust can be flow through from the first expansion chamber X1 to the second expansion chamber X2 via the second connecting tube 76, therefore, it is possible to reliably change the pressure of exhaust.Thus, the erasure effect of silencing apparatus 44 improves.

In silencing apparatus 44, catalyzer 52 is arranged on than the first connecting tube 76 connecting tube 74, second and tail pipe 50 position closer to the front.In other words, (such as, observe the situation of silencing apparatus 44 from side or above-below direction) when observing silencing apparatus 44 from the direction at a right angle with fore-and-aft direction, catalyzer 52 is not overlapping with the first connecting tube 76 connecting tube 74, second and tail pipe 50.Thus, even if such as at the catalyzer 52 that the catalyzer 52(diameter that use is thick is larger), silencing apparatus 44 also can be suppressed thicker.

In the above-described embodiment, the second expansion chamber X2 is provided with to the front at the first dividing plate 70 and the situation being provided with the 3rd expansion chamber X3 at the rear of the first dividing plate 70 is illustrated, but the position of the second expansion chamber and the 3rd expansion chamber is not limited to above-mentioned example.

Fig. 6 and Fig. 7 is the cross section schematic thinking of the structure of the major component of the silencing apparatus 44a representing another embodiment of the present invention.In addition, Fig. 6 figure that to be the figure from left sides silencing apparatus 44a, Fig. 7 be from top view silencing apparatus 44a.In figure 6 and figure 7, " F " represents front, and " R " represents rear.Below, only in silencing apparatus 44a, have and be described with the part of silencing apparatus 44 different structure, the part had with silencing apparatus 44 same structure is omitted the description.

Be to there is silencing apparatus 48a and replace silencing apparatus 48 and there is tail pipe 78 replacing tail pipe 50 with reference to Fig. 6 and Fig. 7, silencing apparatus 44a and silencing apparatus 44 difference.In this embodiment, tail pipe 78 is equivalent to third connecting pipe.

Silencing apparatus 48a and silencing apparatus 48 difference are, have the first dividing plate 80 and replace the first dividing plate 70, have and the second connecting tube 82 replaced for the second connecting tube 76.In silencing apparatus 48a, the rear of the first dividing plate 80 is provided with the second expansion chamber Y2, the front of the first dividing plate 80 is provided with the 3rd expansion chamber Y3.

Tail pipe 78 and tail pipe 50 difference are to have the 4th tubing 78a be connected with the front end of the first tubing 50a further.4th tubing 78a forwards extends and through first dividing plate 80 from the first tubing 50a.In the present embodiment, the front end of the first tubing 50a is embedded in the rearward end of the 4th tubing 78a, such as, by being welded and fixed the first tubing 50a and the 4th tubing 78a.Tail pipe 78 is supported by the first dividing plate 80, second partition 72 and end cap 68d.

The difference of the first dividing plate 80 and the first dividing plate 70 is, does not have through hole 70b and has for the through hole 80a by the 4th tubing 78a.Through hole 80a is arranged at the oblique upper left side of through hole 70a.In the present embodiment, the 4th tubing 78a is with the through through hole 80a of mode that can slide in the longitudinal direction relative to such as the first dividing plate 80.

The difference of the second connecting tube 82 and the second connecting tube 76 is, the size of the fore-and-aft direction of the second connecting tube 82 less than the size of the fore-and-aft direction of the second connecting tube 76 of second connecting tube 82 not through first dividing plate 80.Second connecting tube 82 with the through through hole 72b(of the mode of through second partition 72 in the longitudinal direction with reference to Fig. 6), thus the first expansion chamber X1 is communicated with the second expansion chamber Y2.In the present embodiment, the second connecting tube 82 is such as by being fixedly welded on second partition 72.

In silencing apparatus 44a, the exhaust having flowed into the first expansion chamber X1 from outlet pipe 46 was flowed into the second expansion chamber Y2 by the second connecting tube 82.The exhaust having flowed into the second expansion chamber Y2 is by flowing into the 3rd expansion chamber Y3 between the outer circumferential face of the 4th tubing 62 and the inner peripheral surface of the first connecting tube 74.The exhaust having flowed into the 3rd expansion chamber Y3 is discharged to the outside of main part 68 by tail pipe 78.

By above-mentioned this structure, in silencing apparatus 44a, also the same with silencing apparatus 44, the impact that the heat that fully can reduce catalyzer 52 generation causes silencing apparatus 44a, and in outlet pipe 46, effectively can reduce the delivery temperature near second partition 72.In addition, same with silencing apparatus 44, the assembling of silencing apparatus 44a becomes easy, and the erasure effect of silencing apparatus 44a improves, and silencing apparatus 44a can be suppressed thicker.

In silencing apparatus 44a, the front of the first dividing plate 80 is provided with the 3rd expansion chamber Y3 and catalyzer 52, the rear of the first dividing plate 80 is provided with the second expansion chamber Y2.That is, the circulating direction that catalyzer 52 is arranged at exhaust is positioned at the 3rd expansion chamber Y3 than the second expansion chamber Y2 side farther downstream.In this case, even if the heat that produces due to catalyzer 52 of the delivery temperature of the 3rd expansion chamber Y3 and rising, the exhaust that also can prevent this temperature from rising flows into the second expansion chamber Y2.Thereby, it is possible to suppress the temperature of the exhaust of the second expansion chamber Y2 to rise.Its result, can utilize the exhaust of the second expansion chamber Y2 effectively to cool the exhaust of flowing in outlet pipe 46.

In the above-described embodiment, to the first connecting tube 74 through first dividing plate 70 or the situation of through hole 70a of the first dividing plate 80 be illustrated, but the position of the first connecting tube is not limited to above-mentioned example.

Fig. 8 is the cross section schematic thinking of the structure of the major component of the silencing apparatus 44b representing another embodiment of the invention.In addition, Fig. 8 is the figure from left sides silencing apparatus 44b.In fig. 8, " F " represents front, and " R " represents rear.Below, only in silencing apparatus 44b, have and be described with the part of silencing apparatus 44a different structure, the part had with silencing apparatus 44a same structure is omitted the description.

Be to there is silencing apparatus 48b and replace silencing apparatus 48a with reference to Fig. 8, silencing apparatus 44b and silencing apparatus 44a different aspect.Silencing apparatus 48b and silencing apparatus 48a different aspect are, have the first dividing plate 84 and replace the first dividing plate 80 and have the first connecting tube 74a replacing for the first connecting tube 74.In addition, as described later, the position of the first connecting tube 74a of silencing apparatus 48b is different from the position of first connecting tube 74 of silencing apparatus 48a.In silencing apparatus 48b, the rear of the first dividing plate 84 is provided with the second expansion chamber Z2, the front of the first dividing plate 84 is provided with the 3rd expansion chamber Z3 and arranges.

First dividing plate 84 and the first dividing plate 80 different aspect are to have through hole 70b further.Through hole 70b be arranged at and the first dividing plate 70(with reference to Fig. 3) through hole 70b(with reference to Fig. 3) identical position.

First connecting tube 74a and first connecting tube 74 different aspect be, do not illustrate in the diameter of the first connecting tube 74a less than the diameter of the first connecting tube 74 of the first connecting tube 74a not through through hole 70a(Fig. 8.With reference to Fig. 6.) and through through hole 70b.That is, in silencing apparatus 44b, the first connecting tube 74a is provided with in the position leaving through hole 70a.In this embodiment, such as by welding, the first connecting tube 74a is fixed on the first dividing plate 84.Thus, the first connecting tube 74a is supported in the first dividing plate 84.In addition, although omit detailed description, same with above-mentioned silencing apparatus 44a, the 4th tubing 62 passes through through hole 70a(with reference to Fig. 6 in the mode do not contacted with the first dividing plate 84).

In silencing apparatus 44b, the exhaust having flowed into the first expansion chamber X1 from outlet pipe 46 was flowed into the second expansion chamber Z2 by the second connecting tube 82.The exhaust having flowed into the second expansion chamber Z2 by through hole 70a(with reference to Fig. 6) and the first connecting tube 74a flow into the 3rd expansion chamber Z3.The exhaust having flowed into the 3rd expansion chamber Z3 is discharged to the outside of main part 68 by tail pipe 78.

By above-mentioned that structure, also same with silencing apparatus 44a in silencing apparatus 44b, the impact that the heat that fully can reduce catalyzer 52 generation causes silencing apparatus 44b, and the delivery temperature near second partition 72 can be reduced efficiently in outlet pipe 46.In addition, same with silencing apparatus 44a, the assembling of silencing apparatus 44b becomes easy, and the erasure effect of silencing apparatus 44b improves, and silencing apparatus 44b can be suppressed thicker.

In silencing apparatus 44b, the second expansion chamber Z2 and the 3rd expansion chamber Z3 is via through hole 70a(reference Fig. 6) be communicated with, and the second expansion chamber Z2 is communicated with via the first connecting tube 74a with the 3rd expansion chamber Z3.Therefore, in silencing apparatus 44b, on the basis for the through hole 70a by outlet pipe 46, exhaust can also be flow through from the second expansion chamber Z2 to the 3rd expansion chamber Z3 via the first connecting tube 74a.That is, in the first dividing plate 84, exhaust there are two positions from the second expansion chamber Z2 to the channel setting of the 3rd expansion chamber Z3.In this case, the exhaust of the path (through hole 70a and the first connecting tube 74a) flowing through these two positions can be utilized to cool the first dividing plate 84.Thereby, it is possible to fully suppress the heat affecting of the exhaust flow through in outlet pipe 46 to feed through to the first dividing plate 84.

In the above-described embodiment, the situation connecting holding part 46a and fixing part 46b between the first dividing plate and second partition is illustrated, but the link position of holding part and fixing part is not limited to above-mentioned example.

Fig. 9 is the cross section schematic thinking of the structure of the major component of the silencing apparatus 44c representing another mode of execution more of the present invention.In addition, Fig. 9 is the figure from left sides silencing apparatus 44c.In Fig. 9, " F " represents front, and " R " represents rear.Below, only in silencing apparatus 44c, have and be described with the part of silencing apparatus 44 different structure, the part had with silencing apparatus 44 same structure is omitted the description.

Be to there is outlet pipe 86 and replace outlet pipe 46 with reference to Fig. 9, silencing apparatus 44c and silencing apparatus 44 different aspect.Outlet pipe 86 and outlet pipe 46 different aspect are, have holding part 86a and replace holding part 46a and have fixing part 86b replacing fixing part 46b.

Holding part 86a and holding part 46a different aspect are, have the 4th tubing 88 and replace the 4th tubing 62.4th tubing 88 and the 4th tubing 62 different aspect are, the size of the fore-and-aft direction of the 4th tubing 88 is less than the size of the fore-and-aft direction of the 4th tubing 62.

Fixing part 86b and fixing part 46b different aspect are, have fixing tubing 90 and replace fixing tubing 64.Fixing tubing 90 is with fixing tubing 64 different aspect, and the size of the fore-and-aft direction of fixing tubing 90 is larger than the size of the fore-and-aft direction of fixing tubing 64.

In silencing apparatus 44c, holding part 86a(the 4th tubing 88) fix tubing 90 with fixing part 86b() be connected in the front of the first dividing plate 70.In the present embodiment, the rearward end of the 4th tubing 88 is embedded in the front end of fixing tubing 90, and the 4th tubing 88 can be slided in the longitudinal direction relative to fixing tubing 90.

By this structure, in silencing apparatus 44c, connect holding part 86a and fixing part 86b in the position fully leaving second partition 72.In this case, the length of fixing part 86b, therefore, utilizes fixing part 86b also can alleviate the impact of the thermal expansion of holding part 86a.Such as, when holding part 86a(the 4th tubing 88) on direction, footpath during thermal expansion, even if fixing part 86b(fixes tubing 90) front end expand on direction, footpath due to holding part 86a, when the length of fixing part 86b is longer, the rear portion side of fixing part 86b (second partition 72 side) also can be suppressed to expand on direction, footpath.Thereby, it is possible to fully suppress the impact of the thermal expansion of holding part 86a to feed through to second partition 72.

In addition, in silencing apparatus 44c, same with silencing apparatus 44, silencing apparatus 48 can be used.Therefore, the action effect (action effect based on the structure beyond outlet pipe 46) obtained in silencing apparatus 44 also can similarly obtain in silencing apparatus 44c.

In above-mentioned, the silencing apparatus 44c comprising outlet pipe 86, silencing apparatus 48 and tail pipe 50 is illustrated, but outlet pipe 86 also can be used in the silencing apparatus of other structure.Such as, silencing apparatus 44a(is with reference to Fig. 6) in outlet pipe 86 also can be used to replace outlet pipe 46, silencing apparatus 44b(is with reference to Fig. 8) in outlet pipe 86 also can be used to replace outlet pipe 46.

In the above-described embodiment, the situation being respectively arranged with for the first connecting tube at the first dividing plate 70,80,84 is illustrated, but also the first dividing plate 70,80,84 can not be provided with for the first connecting tube.

In the mode of execution shown in Fig. 6 and Fig. 8, be illustrated being provided with the situation of the second connecting tube 82 at second partition 72, but also second partition 72 can not be provided with for the second connecting tube 82.

In the above-described embodiment, the situation the first dividing plate and second partition respectively to roughly bowl-like shape is illustrated, but the shape of the first dividing plate and second partition is not limited to above-mentioned example.Such as, the first dividing plate also can have circular plate shape, and second partition also can have circular plate shape.

The structure of connecting pipe and outlet pipe is not limited to above-mentioned example, can carry out various design alteration.Such as, in the above-described embodiment, the situation that the first tubing 56 of connecting pipe 42 and outlet pipe 46 is parts is separately illustrated, but connecting pipe and the first tubing also can form as one.In other words, connecting pipe and the first tubing also can be set to parts.In this case, connecting pipe is also contained in outlet pipe.In addition, in the above-described embodiment, the situation that the first tubing 56 and the second tubing 58 are parts is separately illustrated, but the first tubing and the second tubing also can form as one.In other words, the first tubing and the second tubing also can be set to parts.Equally, the 3rd tubing and the 4th tubing also can form as one.

The position relationship of outlet pipe, the first connecting tube, the second connecting tube and tail pipe is not limited to above-mentioned example.Such as, in the silencing apparatus of the respective embodiments described above, also can make outlet pipe, the first connecting tube, the second connecting tube and tail pipe position reversed left to right, also can turn upside down.

Apply Straddle riding type vehicle of the present invention and be not limited to automotive bicycle.Specifically, the present invention is also applicable to other the Straddle riding type vehicle such as driving on uneven ground vehicle (ATV:ALL-TERRAINVEHICLE) and automatic tricycle.In addition, the automotive bicycle that automotive bicycle of the present invention is not limited to type motor being fixed on framework is applied.Specifically, the present invention is also applicable to motor carries out the type swung automotive bicycle (such as, bicycle) relative to framework.

Above, the preferred embodiment of the present invention to be illustrated, but can be clear and definite, only otherwise depart from the scope of the present invention and aim, can various change to be carried out.Scope of the present invention is only limited by the claim of adding.

Claims

1. a silencing apparatus for Straddle riding type vehicle, it has the catalyzer purified engine exhaust, and the feature of this silencing apparatus is, comprising:

The main part of the barrel shape that the fore-and-aft direction of this silencing apparatus extends;

First dividing plate and second partition, it is arranged in described main part, will be divided into the first expansion chamber, the second expansion chamber and the 3rd expansion chamber in described main part;

Outlet pipe, it extends in described main part from front to back in the mode of through described first dividing plate and described second partition,

Described first dividing plate is arranged on more closer to the front than described second partition,

The rear of described second partition is provided with described first expansion chamber,

In described main part, the space in described second partition front is become described second expansion chamber and described 3rd expansion chamber by described first separator lined,

The position that described in the ratio of described catalyzer in described main part, the first dividing plate is closer to the front is arranged in described outlet pipe,

Described first dividing plate has by the through through hole of described outlet pipe,

Described outlet pipe not to be supported in described second partition by described through hole with the mode of described first baffle contacts,

After described outlet pipe, described first expansion chamber, described second expansion chamber and described 3rd expansion chamber are flow through in described exhaust successively, be discharged to described main part outside.

2. silencing apparatus as claimed in claim 1, is characterized in that:

Described outlet pipe comprises the holding part keeping described catalyzer and the fixing part being fixed on described second partition,

Described holding part is connected with described fixing part in the mode can slided in the longitudinal direction relative to described fixing part.

3. silencing apparatus as claimed in claim 2, is characterized in that:

Described holding part and described fixing part connect between described first dividing plate and described second partition.

4. silencing apparatus as claimed in claim 2, is characterized in that:

Described holding part is connected with the front of described fixing part at described first dividing plate.

5. the silencing apparatus according to any one of Claims 1 to 4, is characterized in that:

Also comprise the first connecting tube being communicated with described second expansion chamber and described 3rd expansion chamber,

Described first connecting tube is by the described through hole of described first dividing plate and be supported in described first dividing plate,

Described outlet pipe passes through in described first connecting tube in the mode do not contacted with described first connecting tube.

6. the silencing apparatus according to any one of Claims 1 to 4, is characterized in that:

Described first connecting tube is supported in described first dividing plate in the position leaving described through hole.

7. silencing apparatus as claimed in claim 5, is characterized in that, also comprise:

Be communicated with the second connecting tube of described first expansion chamber and described second expansion chamber; With

Be communicated with the third connecting pipe of described 3rd expansion chamber and described main part outside,

Described second expansion chamber is arranged at the front of described first dividing plate,

Described 3rd expansion chamber is arranged at the rear of described first dividing plate,

Second connecting tube through described first dividing plate and described second partition and be supported in described first dividing plate and described second partition,

The through described second partition of third connecting pipe and be supported in described second partition.

8. silencing apparatus as claimed in claim 6, is characterized in that, also comprise:

9. silencing apparatus as claimed in claim 5, is characterized in that, also comprise:

Described second expansion chamber is arranged at the rear of described first dividing plate,

Described 3rd expansion chamber is arranged at the front of described first dividing plate,

Described second connecting tube through described second partition and be supported in described second partition,

Through described first dividing plate of described third connecting pipe and described second partition and be supported in described first dividing plate and described second partition.

10. silencing apparatus as claimed in claim 6, is characterized in that, also comprise:

11. silencing apparatuss as claimed in claim 7, is characterized in that:

Described catalyzer is arranged on more closer to the front than described first connecting tube, described second connecting tube and described third connecting pipe.

12. silencing apparatuss as claimed in claim 8, is characterized in that:

13. silencing apparatuss as claimed in claim 9, is characterized in that:

14. silencing apparatuss as claimed in claim 10, is characterized in that:

15. 1 kinds of Straddle riding type vehicles, is characterized in that:

Comprise the silencing apparatus according to any one of claim 1 ~ 14.