JP2008025465A - Exhaust pipe structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pipe structure for a vehicle capable of suppressing vibration of a connecting member. <P>SOLUTION: A connection unit 60 connecting exhaust pipes 50B, 50C are provided with an outer circumference vibration isolation member 70 wound around an outer circumference of the exhaust pipe 50B, 50C, and a connection plate 80 connecting the exhaust pipes 50B, 50C under a condition of putting the outer circumference vibration isolation member 70 therebetween. Vibration of the connection plate 80 is suppressed by the outer circumference vibration isolation member 70. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle exhaust pipe structure in which a plurality of exhaust pipes extending from an engine are connected by a connecting member.

Conventionally, in motorcycles, reinforcing members are wound around a plurality of exhaust pipes extending from an engine, and both ends of each reinforcing member are extended and connected to each other, thereby connecting a plurality of exhaust pipes. The thing provided with the member is known (for example, refer patent document 1).
JP 2002-155743 A

However, in the conventional configuration, there is a problem in that the connecting member itself vibrates due to vehicle body vibration or engine vibration when the vehicle travels, and noise is generated by this vibration.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an exhaust pipe structure for a vehicle that can suppress vibration of a connecting member.

  In order to solve the above-described problems, the present invention provides a vehicle exhaust pipe structure in which a plurality of exhaust pipes extending from an engine are connected by a connection member, and the vibration isolation member of the connection member is provided on the connection member of the exhaust pipe. It is characterized by that. According to this invention, since the vibration isolating member for the connecting member is provided in the connecting member for the exhaust pipe, the vibration of the connecting member can be suppressed, and the generation of noise caused by the vibration can be suppressed.

  In this case, it is preferable that the vibration isolation member includes an outer peripheral vibration isolation portion wound around an outer periphery of the exhaust pipe, and the connecting member is provided so as to sandwich the outer peripheral vibration isolation portion from the outside. According to this configuration, since the connecting member is provided so as to sandwich the outer periphery vibration isolation portion wound around the outer periphery of the exhaust pipe from the outside, the vibration of the exhaust pipe is reduced by the outer periphery vibration isolation portion before being transmitted to the connection member. It is possible to suppress the vibration of the connecting member and suppress the generation of noise due to the vibration.

  In this case, it is preferable that the connecting member is composed of a single plate having substantially the same shape as the cross-sectional shape of the exhaust pipe. According to this structure, since a connection member consists of a single plate, a number of parts can be reduced.

  The connecting member includes a connecting plate connected to the plurality of exhaust pipes by welding, and the vibration isolation member is provided so as to be in contact with the connecting plate and has a pressing plate on the opposite side of the connecting plate. Is preferably provided. According to this configuration, the vibration isolating member is provided so as to be in contact with the connection plate connected to the plurality of exhaust pipes by welding, and the pressing plate is provided on the side opposite to the connection plate. Can suppress vibration.

  Further, it is preferable that a dynamic weight is connected to the connecting member via an elastic member. According to this configuration, it is possible to easily obtain an appropriate vibration-proof performance according to the vehicle specifications by changing the mass of the dynamic weight or the spring constant of the elastic member.

In the present invention, since the vibration isolating member for the connecting member is provided in the connecting member for the exhaust pipe, the vibration of the connecting member can be suppressed, and the generation of noise caused by the vibration can be suppressed.
In addition, since the connecting member is provided so as to sandwich the outer peripheral vibration isolating portion wound around the outer periphery of the exhaust pipe from the outside, the outer peripheral vibration isolating section can reduce the vibration of the exhaust pipe before being transmitted to the connecting member.
Further, since the connecting member is made of a single plate having substantially the same shape as the cross-sectional shape of the exhaust pipe, the number of parts can be reduced.
Further, since the vibration isolating member is provided so as to be in contact with the connecting plate connected to the plurality of exhaust pipes by welding, and a pressing plate is provided on the opposite side to the connecting plate, vibration of the connecting member is suppressed with a simple configuration. be able to.
Also, since the dynamic weight is connected to the connecting member via the elastic member, it is possible to easily obtain an appropriate vibration-proof performance according to the vehicle specifications by changing the mass of the dynamic weight or the spring constant of the elastic member. Can do.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the description, descriptions of directions such as front and rear, right and left, and top and bottom are for the vehicle body. In the figure, an arrow FR indicates the front side of the vehicle, and an arrow UP indicates the upper side of the vehicle body.

<First Embodiment>
FIG. 1 is a side view showing the overall configuration of the motorcycle according to the first embodiment of the present invention. The motorcycle 1 includes a body frame 2, a pair of left and right front forks 3 rotatably supported by a head pipe 2A of the body frame 2, and a steering handle 4 disposed at an upper end portion of the front forks 3. A front wheel 5 rotatably supported by the front fork 3, an engine 6 supported by the vehicle body frame 2 at the approximate center of the vehicle body, a radiator 7 disposed in front of the engine 6, and a vehicle body behind the engine 6 Arranged between the rear fork 8 and the vehicle body frame 2, a rear fork 8 that is swingably supported by the frame 2, a rear wheel 9 that is rotatably supported at the rear end of the rear fork 8. The rear cushion 10, the fuel tank 11 disposed at the top of the vehicle body frame 2, the front seat 12 disposed behind the fuel tank 11 and seated by the driver, and the same. Who has a rear seat 13 to be seated, substantially the entire vehicle body is configured to full cowling type covered by the cowl 14.

The vehicle body frame 2 includes a main frame 20 that supports the engine 6 and the like, and a pair of left and right seat rails 21 that support the seats 12 and 13, which are manufactured by casting or forging a metal material such as an aluminum alloy. Yes.
The main frame 20 extends from the head pipe 2A to the left and right diagonally downward, and includes a pair of left and right frame portions 20A in which a pair of left and right front engine hangers 22 are integrally formed, and each frame portion 20A. A pair of left and right pivot plates 20 </ b> B is provided with a pair of left and right rear engine hangers 23 integrally formed at the lower end thereof.

  The pair of left and right pivot plates 20B are connected to the front end of the rear fork 8 so as to be freely rotatable, and a pair of left and right main steps 25 on which a driver sitting on the front seat 12 gets his / her foot. The pair of left and right seat rails 21 are connected at their front ends to the rear end of the frame portion 20A, and a pair of left and right pillion steps 26 on which the passengers seated on the rear seat 13 put their feet are attached. .

The engine 6 includes a crankcase 31, a cylinder block 32 formed integrally with the front portion of the crankcase 31, and a cylinder head 33 coupled to the upper portion of the cylinder block 32. This is a parallel 4-cylinder 4-cycle engine (multi-cylinder engine) in which four cylinders (cylinders) are arranged in parallel in the direction.
In the engine 6, the cylinder block 32 is bolted to the front engine hanger 22 of the main frame 20, and the crankcase 31 is bolted to the rear part of the main frame 20 and the rear engine hanger 23, respectively. The cylinder head 33 is supported by the vehicle body frame 2 in a state where the cylinder head 33 is inclined forward toward the vehicle body front side.

  The cylinder block 32 accommodates a piston in a reciprocating manner in each cylinder, and the crankcase 31 is supported by a crankshaft and an output shaft 35 connected to each piston via a connecting rod, and the crankshaft and the output. A clutch mechanism, a speed change mechanism, and the like that constitute a power transmission mechanism with respect to the shaft 35 are accommodated. The power transmission from the output shaft 35 to the rear wheel 9 is performed via the chain transmission mechanism 36, that is, the sprockets 37, 38 provided on the output shaft 35 and the rear wheel 9, respectively, and the sprockets 37, 38. The power of the engine 6 is transmitted to the rear wheel 9 through the drive chain 39 wound around the rear wheel 9.

  Four intake ports 33A, 33A, 33A, 33A are opened in the left and right rows on the rear surface of the cylinder head 33 of the engine 6, and a throttle body (not shown) is provided in each intake port 33A, 33A, 33A, 33A. The air cleaner 40 is connected via In addition, four exhaust ports 33B, 33B, 33B, 33B are opened in the left and right lines on the front surface of the cylinder head 33, and four exhaust pipes 50A, 50B, 33B, 33B, 33B are provided for each of the exhaust ports 33B, 33B, 33B, 33B. 50C and 50D are connected to each other. Hereinafter, for convenience of explanation, the four exhaust pipes 50A, 50B, 50C, and 50D are referred to as exhaust pipes 50 when it is not necessary to particularly distinguish them.

  The four exhaust pipes 50 are formed by bending a metal pipe made of stainless steel, titanium, or the like. As shown in FIGS. 2 and 3, each exhaust pipe 50 is provided with a joint 50J at the upstream tip, and the tip is pressed against the cylinder head 33 with a gasket (not shown) interposed therebetween, so that the joints 50J, 50J, 50J and 50J are bolted to the cylinder head 33, whereby the exhaust pipe 50 is connected to the exhaust ports 33B, 33B, 33B, and 33B of the cylinder head 33 (see FIG. 1).

  As shown in FIG. 1, the four exhaust pipes 50 extend diagonally forward and downward from the exhaust ports 33B, 33B, 33B, and 33B, then bend to the rear of the vehicle body and pass under the front part of the crankcase 31, As shown in FIG. 3, two on the left side (exhaust pipes 50A and 50B) in the vehicle body traveling direction and two on the right side (50C and 50D) in the vehicle body traveling direction are gathered together by the first exhaust pipe collecting portions 51L and 51R. Is done. The first exhaust pipe collecting portions 51L and 51R are made of metal cylinders, and the collective exhaust pipes 52L and 52R having a larger diameter than the exhaust pipe 50 are connected to the rear ends of the first exhaust pipe collecting portions 51L and 51R, respectively. Is done. The collective exhaust pipes 52L and 52R extend rearward along the lower surface of the crankcase 31, and are connected to a second exhaust pipe collective part 53 made of a metal cylinder below the rear part of the crankcase 31. Is gathered.

As shown in FIG. 1, a collective exhaust pipe 54 having a larger diameter than the collective exhaust pipes 52 </ b> L and 52 </ b> R is connected to the rear part of the second exhaust pipe collective portion 53. The collective exhaust pipe 54 bends behind the crankcase 31 and extends upward on the right side of the rear cushion 10, bends backward near the upper portion of the rear cushion 10, and passes diagonally between the pair of left and right seat rails 21. It extends upward and its rear end is connected to a muffler 55 disposed between the seat rails 21. That is, the four exhaust pipes 50A to 50D, the first exhaust pipe collecting portions 51L and 51R, the collecting exhaust pipes 52L and 52R, the second exhaust pipe collecting portion 53, the collecting exhaust pipe 54, and the muffler 55 An exhaust unit 100 is configured.
Thus, by arranging the collective exhaust pipe 54 and the muffler 55 between the seat rails 21, these parts can be accommodated in the rear seat cowl constituting one part of the cowl 14, and the muffler is arranged on the side of the vehicle body. In addition to preventing the occurrence of turbulent flow, it is possible to easily equalize the left and right weights.

By the way, in this structure, as shown in FIG.2 and FIG.3, it has the connection unit 60 which connects the center two exhaust pipe 50B, 50C among four exhaust pipe 50A, 50B, 50C, 50D. The connecting unit 60 prevents the exhaust pipes 50A and 50B from vibrating separately due to vehicle body vibrations and engine vibrations during vehicle travel.
As shown in FIG. 2, the connecting unit 60 is attached to the upstream part of the exhaust pipes 50B and 50C (that is, the front part of the crankcase 31), more specifically, the engine 6 side of the exhaust pipes 50B and 50C. Are attached at a substantially intermediate position between the bent portion M1 and the bent portion M2 that bends greatly toward the lower side of the crankcase 31.

FIG. 4 is a cross-sectional view showing the connecting unit 60 together with the exhaust pipes 50A to 50D. 5A is a cross-sectional view of the connecting unit 60, and FIG. 5B is a view of the connecting unit 60 as viewed from the front of the vehicle body along with its peripheral configuration. 4 and 5A show a cross section perpendicular to the axis of the exhaust pipe 50C (IV-IV cross section shown in FIG. 2).
As shown in FIG. 4 and FIG. 5 (A), the connecting unit 60 includes an outer peripheral vibration isolation member (anti-vibration member) 70 wound around the outer periphery of the exhaust pipes 50B and 50C, and the outer peripheral vibration isolation member 70 from the outside. A connecting plate (connecting member) 80 that connects the exhaust pipes 50B and 50C in a sandwiched state is provided.

Glass wool is applied to the outer peripheral vibration isolation member 70. Since glass wool is a glass fiber, it has heat resistance enough to withstand the heat from the exhaust pipes 50B and 50C, and when the connecting plate 80 and the exhaust pipes 50B and 50C vibrate, the glass fiber is rubbed by the vibration. Vibration energy can be converted into thermal energy. For this reason, this outer periphery vibration-proof member 70 can convert vibration energy transmitted from the exhaust pipes 50B and 50C to the connection plate 80 by converting vibration energy of the connection plates 80 and the exhaust pipes 50B and 50C into heat energy. Further, by adjusting the fiber diameter and density of the glass wool, it is possible to adjust to the appropriate vibration-proof performance according to the vehicle specifications (engine model, exhaust pipe configuration, etc.).
Instead of glass wool, other metal wool such as suspension wool or other non-combustible fiber material such as ceramic wool may be applied, or an elastic member such as heat resistant rubber may be applied. An anti-vibration material having the above heat resistance may be applied.

The connecting plate 80 is formed by bending a substantially rectangular metal plate along the outer shape of the exhaust pipes 50B and 50C at the mounting position of the connecting plate 80. More specifically, the connecting plate 80 includes exhaust pipe cover portions 81L and 81R that respectively cover the exhaust pipes 50B and 50C with a substantially constant gap L1 between the exhaust pipes 50B and 50C. The bridge portions 81M and 81M, which are spanned between the exhaust pipes 50B and 50C and have a substantially constant gap L2, are integrally formed, and both end portions 81T1 and 81T2 of the metal plate are located on the side of the one exhaust pipe 50B. It is formed in the shape which contacts.
4 and 5A have a vertical cross-section with respect to the exhaust pipe 50C, the cross-sectional shape of the exhaust pipe 50C is a perfect circle, whereas the exhaust pipe 50A, 50B, 50D Since the cross sections of the exhaust pipes 50A, 50B, and 50D are slightly oblong, the gap L1 between the outer peripheral surfaces of the exhaust pipes 50B and 50C is actually It is formed in the same gap.

When the connection plate 80 is attached to the exhaust pipes 50B and 50C, both end portions 81T1 and 81T2 of the connection plate 80 are opened and passed through the exhaust pipes 50C and 50B in order from the side of the exhaust pipe 50C. When the force to open 81T2 is weakened, both end portions 81T1 and 81T2 are closed by the elastic restoring force of the connecting plate 80 itself and come into contact with each other, and the connecting plate 80 is attached so as to sandwich the exhaust pipes 50B and 50C.
In this case, the outer periphery vibration isolation member 70 is wound around the outer periphery of the exhaust pipes 50A and 50B in advance before the connection plate 80 is attached, or is previously disposed inside the connection plate 80 before the attachment. The exhaust pipes 50 </ b> A and 50 </ b> B and the connection plate 80 can be disposed in the gap L <b> 1 or in the gap L <b> 2 of the connection plate 80.

  The bridging portions 81M and 81M of the connecting plate 80 are formed with holes 81H and 81H communicating in the front-rear direction. Bolts 85 are inserted into the holes 81H and 81H from the front of the crankcase 31 so that the nut 86 is inserted. Thus, the connecting plate 80 is securely fixed to the exhaust pipes 50B and 50C with the outer vibration isolation member 70 sandwiched between the exhaust pipes 50B and 50C.

In the present embodiment, the connecting unit 60 that connects the exhaust pipes 50B and 50C exhausts with the outer peripheral vibration isolation member 70 wound around the outer periphery of the exhaust pipes 50B and 50C and the outer peripheral vibration isolation member 70 sandwiched from the outside. Since the connection plates 80 for connecting the pipes 50B and 50C are provided, the vibrations of the exhaust pipes 50B and 50C can be reduced by the outer vibration isolation member 70 before the vibrations of the exhaust pipes 50B and 50C are transmitted to the connection plates 80. Generation of noise caused by vibration can be suppressed.
In addition, since not only the connecting plate 80 but also the exhaust pipes 50B and 50C are in contact with the outer peripheral vibration isolation member 70, the vibrations of the exhaust pipes 50B and 50C can be reduced by the outer peripheral vibration isolation member 70. For this reason, in comparison with the conventional one in which the exhaust pipe is connected without providing this type of outer vibration isolating member 70, not only the vibration of the connection plate 80 but also the generation of noise caused by the vibration of the exhaust pipes 50B and 50C. Can be suppressed.

  In this way, since this configuration can reduce the vibrations of the exhaust pipes 50B and 50C, the first exhaust pipe assembly portions 51L and 51R, the collective exhaust pipes 52L and 52R, and the second exhaust pipe assembly connected to the exhaust pipes 50B and 50C. The vibration of the portion 53 and the collective exhaust pipe 54 can also be reduced, and the vibration of the exhaust pipes 50A and 50D connected to the first exhaust pipe collective portions 51L and 51R can be sufficiently reduced. Therefore, the connection unit 60 can reduce the vibration of the connection plate 80 and the exhaust unit 100 as a whole by the outer peripheral vibration isolation member 70, and can suppress the generation of noise caused by the vibration of each part.

Further, in the present embodiment, the connecting unit 60 is attached to a substantially intermediate position between the bent portions M1 and M2 of the exhaust pipes 50B and 50C, so that the bent portions M1 and M1 whose amplitude tends to be maximized when the exhaust pipes 50B and 50C vibrate. It is possible to efficiently reduce vibration at a substantially intermediate position between M2. Moreover, since the attachment position of the connection unit 60 is in an easily accessible position from the front of the crankcase 31, attachment and removal of the connection unit 60 are easy.
Furthermore, in the present embodiment, since the connection plate 80 of the connection unit 60 is formed from a single plate having substantially the same shape as the cross-sectional shape of the exhaust pipes 50B and 50C, a reinforcing member is wound around each of the plurality of exhaust pipes. Thus, the number of parts can be reduced as compared with the conventional one in which the reinforcing members are connected to each other.

  Further, since the connecting unit 60 of the present embodiment can be attached to the exhaust pipes 50B and 50C without any special contrivance in the exhaust pipes 50B and 50C, the existing exhaust pipe that does not employ this type of vibration isolation structure. Can be easily attached to.

<Second Embodiment>
6A and 6B show a connecting unit 160 of the second embodiment. As shown in FIGS. 6A and 6B, the connection unit 160 is connected to the exhaust pipes 50B and 50C by welding to connect the exhaust pipes 50B and 50C, and the opposite of the connection plate 180. A pressing plate 190 is provided on the side to be fixed with the vibration isolating member 170 interposed therebetween. In addition, the substantially same member as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits detailed description.
A flat metal plate is applied to the connecting plate 180 and the pressing plate 190, and holes 81H and 81H communicating with each other are formed. Bolts 85 are inserted into the holes 81 </ b> H and 81 </ b> H of the connecting plate 180 and the holding plate 190 from the front of the crankcase 31 and fastened to the nut 86, so that the vibration isolating member 170 is interposed between the connecting plate 180 and the holding plate 190. The holding plate 190 is fixed to the connecting plate 180 so as to sandwich the plate.

For the vibration isolation member 170, a vibration isolation material having heat resistance that can withstand the heat from the exhaust pipes 50B and 50C such as glass wool and capable of reducing vibrations acting from the outside is applied.
In this embodiment, since the holding plate 190 is fixed with the vibration isolating member 170 sandwiched between the connection plates 180 that connect the exhaust pipes 50B and 50C, the connecting unit 160 can be easily configured, and the vibration isolating member 170 is also configured. Functions as an anti-vibration member that reduces the vibration of the connecting plate 180, and the generation of noise due to the vibration of the connecting plate 180 can be suppressed.

Further, even when the exhaust pipes 50B and 50C vibrate, the vibration of the connecting plate 180 due to this vibration is reduced by the vibration isolating member 170, and also when the pressing plate 190 vibrates, the vibration is prevented from contacting the pressing plate 190. Reduced by the vibration member 170, the generation of noise due to the vibration of these members can also be suppressed.
Furthermore, in this embodiment, since the connecting plate 180 and the holding plate 190 constituting the connecting unit 160 need not be bent, each part can be easily manufactured, and the outer circumferences of the exhaust pipes 50B and 50C can be formed. Since the anti-vibration member 170 and the connection plate 180 are not covered, the connection unit 160 can be reduced in size.
Also in the present embodiment, as in the first embodiment, since no special device is required for the exhaust pipes 50B and 50C to attach the connecting unit 160, an existing exhaust pipe that does not employ this type of vibration isolation structure. Can be easily attached to.

<Third Embodiment>
7A and 7B show a connection unit 260 of the third embodiment. The connection unit 260 is fixed to the exhaust pipes 50B and 50C by welding or the like and connected to the connection plate 180 for connecting the exhaust pipes 50B and 50C with a vibration isolating member 170 interposed therebetween. A plate 290 and a weight (mass body) 292 connected to the pressing plate 290 via an elastic member 291 are provided.
A rubber material made of an elastic material such as rubber is applied to the elastic member 291. As shown in FIG. 7A, a vibration-proof member 170 having heat resistance is disposed between the elastic member 291 and the connecting plate 180. Therefore, the vibration-proof member 291 has relatively low heat resistance. Even if it is a thing, the elastic member 291 can be protected from the heat of the exhaust pipes 50B and 50C by the vibration isolation member 170.

Further, since the weight 292 is elastically supported by the connecting plate 180 that connects the exhaust pipes 50B and 50C, the weight 292 functions as a damper weight, and the entire connecting unit 260 can function as a vibration-proof damper.
In the present embodiment, the mass of the weight 292, the spring constant of the elastic member 291 and the like are adapted to the frequency at which the natural frequency of the anti-vibration damper is desired to be reduced, specifically, the natural frequency of the connecting plate 180. Adjusted to Therefore, when the connecting unit 260 functioning as a vibration isolating damper receives external vibration, the natural vibration energy of the connecting plate 180 is converted into the vibration energy of the vibration isolating damper and absorbed, thereby reducing the vibration of the connecting plate 180. Can function as a damper.

As described above, since the weight 292 is elastically supported by the connecting plate 180 that connects the exhaust pipes 50B and 50C and functions as a dynamic weight, the vibration of the connecting plate 180 can be surely reduced, and the generation of noise due to this vibration. Can be reliably suppressed. Further, by simply changing the mass of the weight 292 and the spring constant of the elastic member 291, it is possible to easily obtain an appropriate vibration-proof performance according to the vehicle specifications (engine model, exhaust pipe configuration, etc.).
In addition, since the vibration isolating member 170 is disposed between the connecting plate 180 and the pressing plate 290, the vibration of the connecting plate 180, the exhaust pipe 50, and the pressing plate 290 can be reduced by the vibration isolating member 170. The vibration-proof member 170 can also be used as a heat blocking member that protects the elastic member 291 from the heat of the exhaust pipe 50.

Also, in this connection unit 260, similarly to the second embodiment, the connection plate 180 and the holding plate 290 do not need to be bent, so that each part can be easily manufactured, and the exhaust pipe 50B, Since the outer periphery of 50C is not covered with the vibration isolation member 170 or the like, the connecting unit 260 can be reduced in size.
Also in this embodiment, as in the first and second embodiments, the exhaust pipes 50B and 50C are not required to be attached to the connection unit 260, so that existing vibration-proof structures of this type are not employed. Can be easily attached to the exhaust pipe.

As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this, A various design change can be performed. For example, in the above-described embodiment, the case where the connection units 60, 160, and 260 are attached to a substantially intermediate position between the bent portions M1 and M2 of the exhaust pipes 50B and 50C has been described. The pipe 50 is preferably attached to a portion having a large vibration or a portion corresponding to a vibration antinode, for example, a portion corresponding to a vibration antinode caused by pulsation of exhaust gas flowing in the exhaust pipe 50, and a straight portion of the exhaust pipe. It is preferable to provide in.
Further, in the above-described embodiment, the case where the dynamic weight is provided on the pressing plate 290 has been described. However, the present invention is not limited to this, and the dynamic weight may be directly provided on the connection plates 80 and 180.

Moreover, although the case where a metal plate is used for the connection plates 80 and 180 and the holding plate 190 has been described in the above embodiment, the present invention is not limited to this, and a plate made of another material having heat resistance is applied. Also good.
In the above-described embodiment, the case where the present invention is applied to the exhaust pipe structure of a motorcycle has been described. However, the present invention is not limited thereto, and can be widely applied to vehicles in which a plurality of exhaust pipes extend from an engine. For example, the present invention can be applied to an exhaust pipe structure of a saddle-ride type vehicle including a three-wheel vehicle, a four-wheel vehicle, and the like classified as ATV (rough terrain vehicle).

1 is a side view showing an overall configuration of a motorcycle according to a first embodiment. It is the figure which looked at the exhaust unit from the side. It is the figure which looked at the exhaust unit from the upper part. It is a figure which shows the IV-IV cross section of FIG. (A) is sectional drawing of a connection unit, (B) is the figure which looked at the connection unit from the vehicle body front with the periphery structure. (A) is sectional drawing of the connection unit of 2nd Embodiment, (B) is the figure which looked at the connection unit from the vehicle body front with the periphery structure. (A) is sectional drawing of the connection unit of 3rd Embodiment, (B) is the figure which looked at the connection unit from the vehicle body front with the peripheral structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 6 Engine 31 Crankcase 32 Cylinder block 33 Cylinder head 50, 50A, 50B, 50C, 50D Exhaust pipe 51L, 51R 1st exhaust pipe collection part 52L, 52R, 54 Collective exhaust pipe 53 2nd exhaust pipe Collecting portion 55 Muffler 60, 160, 260 Connection unit 70 Outer vibration isolation member (vibration isolation member)
80,180 connection plate (connection member)
81L, 81R Exhaust pipe cover part 81M Cross-linking part 81T1, 81T2 Both end parts 81H Hole part 85 Bolt 86 Nut 100 Exhaust unit 170 Anti-vibration member 190,290 Holding plate 291 Elastic member 292 Weight (dynamic weight)
M1, M2 bending part

Claims (5)

In the exhaust pipe structure of a vehicle in which a plurality of exhaust pipes extending from the engine are connected by a connecting member,
An exhaust pipe structure for a vehicle, wherein the connection member for the exhaust pipe is provided with a vibration isolating member for the connection member. The vibration isolation member includes an outer periphery vibration isolation portion wound around an outer periphery of the exhaust pipe,
The exhaust pipe structure for a vehicle according to claim 1, wherein the connecting member is provided so as to sandwich the outer periphery vibration isolation portion from the outside.   The exhaust pipe structure for a vehicle according to claim 2, wherein the connecting member comprises a single plate having substantially the same shape as the cross-sectional shape of the exhaust pipe. The connecting member comprises a connecting plate connected to the plurality of exhaust pipes by welding,
2. The exhaust pipe structure for a vehicle according to claim 1, wherein the vibration isolation member is provided so as to be in contact with the connection plate, and a pressing plate is provided on a side opposite to the connection plate. The exhaust pipe structure for a vehicle according to any one of claims 1 to 4, wherein a dynamic weight is connected to the connecting member via an elastic member.

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