JP2001263045A - Muffle device with spark arrester for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To meet silencer function of a muffler device without increasing its size, to facilitate attach/detach of a spark arrester and cleaning, and to enhance maintenance performance, by facilitating disassembling while ensuring support of a tail pipe having a tip with the spark arrester mounted. SOLUTION: In this muffler device, an exhaust gas flowing from an upstream side is reversed in first and second exhaust gas expansion chambers 28a, 28b, expanded and silenced thereby being discharged from the tail pipe 38. The tail pipe 38 for discharging exhaust gas inside the muffler is detachably provided so as to get through the first exhaust gas expansion chamber 28a from a rear end of a muffler body, penetrate a baffle plate 24, and pass through the second exhaust gas expansion chamber 28b. The spark arrester 40 is made detachable to a tip of the tail pipe 38 arranged inside the second exhaust gas expansion chamber, and a center of the spark arrester 40 is arranged at a position eccentric with respect to a center of the muffler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler device with a spark arrester for a vehicle such as an off-road motorcycle.

[0002]

2. Description of the Related Art A muffler device for a motorcycle usually has a tubular appearance, and an exhaust pipe of an engine is connected to a front end of the muffler device so that exhaust gas discharged from the engine is supplied to a plurality of exhaust expansion silence chambers in the muffler device. After mute, the tail pipe at the rear end of the muffler is released to the outside. Motorcycles for off-road use, such as those for off-road use, are equipped with a spark arrester, which is a tail pipe attached to the exhaust gas outlet at the rear of the muffler. A wire mesh filter is attached to the front end of the tail pipe located in the body to prevent the discharge of the sparks from the muffler when the exhaust gas contains the sparks.

As shown in FIG. 5, for example, a spark arrestor is provided with a tail pipe B provided at the rear end of a muffler cylinder A.
Is attached to the front side B1 in the expansion chamber in which the tail pipe B is attached. A filter C of a cylindrical wire mesh having the same diameter as the tail pipe B is attached, and the exhaust gas is filtered by the filter C to remove sparks. From the muffler.

Here, the spark arrester is a device for filtering the exhaust gas with a wire mesh filter to prevent the sparks from scattering outside the muffler as described above. Soot-like carbon accumulates in the filter and clogs the mesh of the filter. If the clogging is extremely difficult, the output of the engine will decrease, so periodic cleaning is necessary.

Conventionally, regarding a muffler spark arrestor, as disclosed in Japanese Utility Model Publication No. 61-8178, a tail pipe is attached to a front end of a tail pipe and integrated into the final expansion chamber of the muffler. There is one in which the front end is positioned (prior art 1). Also,
As disclosed in Japanese Utility Model Publication No. 64-5049, there is a structure in which a spark arrester is provided at an open end in an muffler of an exhaust pipe for introducing exhaust gas from an engine into a muffler, that is, at a front end of the muffler (prior art 2). Furthermore, Japanese Utility Model Application Laid-Open No. 62-34111 discloses an arrangement in which two expansion chambers are formed in a muffler, and a spark arrestor connected to the front part of a tail pipe is provided across the two chambers. (Prior art 3).

[0006]

As described above, in the screen type arrester, it is important for maintenance to remove and clean it. However, in the prior art 2, in the spark arrester provided at the front end of the muffler, If it is not removed from the exhaust pipe, it is difficult to inspect and replace it, and maintenance is low.
Also, if the arrester is small in diameter with respect to the muffler body, there is no particular problem in terms of maintainability even in the prior arts 1 and 3, but the muffler body has a small diameter and the spark arrestor has a small diameter with respect to the muffler body. In the case of a relatively large diameter, compatibility with noise reduction performance becomes a problem. Also,
In particular, a muffler device that has a long muffler body, has a plurality of expansion chambers in the length direction of the muffler body, satisfies the noise reduction function, and has a spark arrestor mounted thereon has not been proposed. Also, in a motorcycle, given the situation where the rider frequently changes the riding posture while driving,
Increasing the diameter of the muffler body as described above is not preferable because the riding posture is limited. Furthermore, in a saddle-ride type vehicle other than a motorcycle, such as a vehicle traveling on an irregular ground, similarly, the increase in the diameter of the muffler body has a problem that the riding posture is limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can satisfy the muffling function of a muffler device without requiring an increase in diameter, and secure the support of a tail pipe having a spark arrestor attached to the tip. An object of the present invention is to provide a muffler device with a spark arrestor for a vehicle, which is easy to remove while the spark arrester is easy to attach and detach, is easy to clean, and has high maintenance.

[0008]

In order to achieve the above object, the present invention has the following arrangement. The present invention relates to a muffler device for engine exhaust noise reduction provided with a screen type spark arrestor inside, which is extended along a vehicle body. The first and second exhaust expansion chambers are formed toward the front, and the first and second exhaust expansion chambers at the rear end of the muffler body are inserted through the inflow pipes through which the exhaust gas flows in from the upstream through the partition wall. A communication passage communicating the second exhaust gas expansion chambers is provided through the partition wall, and a tail pipe for exhausting the muffler exhaust is provided from the rear end of the muffler body through the first exhaust gas expansion chamber and through the partition wall. The second exhaust expansion chamber is inserted so as to be detachably provided, is detachable at the tip of a tail pipe located in the second exhaust expansion chamber, and the arrestor center is located at a position eccentric with respect to the muffler center. Sparkle A spark arrester with muffler for a vehicle, characterized in that provided coater.

According to the present invention, in the muffler device for engine exhaust noise reduction, the first and second exhaust expansion chambers are formed in the cylindrical muffler body from the rear end of the body toward the front with the partition wall interposed therebetween. The first exhaust expansion chamber at the rear end of the muffler body penetrates the partition wall to allow exhaust to flow from the upstream side through the inflow pipe, and the communication path allows the first exhaust expansion chamber to flow from the second exhaust expansion chamber to each other. Exhaust gas is allowed to flow in, and exhaust gas is discharged from the second exhaust gas expansion chamber to the outside of the muffler body by a tail pipe penetrating the first exhaust gas expansion chamber. It reverses, expands, silences, and exits the tailpipe. Therefore, the length of the tail pipe can be increased, and the installation location of the spark arrestor can be located at a location recessed from the rear end of the muffler body. Further, a tail pipe for exhausting the exhaust inside the muffler is detachably provided by being inserted from the rear end of the muffler body, passing through the first exhaust expansion chamber, penetrating the partition, and being inserted into the second exhaust expansion chamber, and It can be attached to and detached from the tip of the tail pipe located in the expansion chamber. The tailpipe can be removed when necessary, such as during maintenance, to facilitate inspection and replacement of the spark arrester. Of course, the spark arrester provided at the front end of the tail pipe prevents the passage of sparks contained in the exhaust gas, and prevents the discharge of sparks from the tail pipe. Also, since the center of the muffler and the spark arrestor were provided with the arrestor center located at an eccentric position, even if a tail pipe was attached across the inflow pipe and the communication passage, the spark arrester at the tip had a margin. It can be installed and the muffler body does not increase in diameter. In the present invention, it is preferable that a spacer is provided at a location corresponding to the partition on the outer peripheral portion of the arrester, and the spark arrestor is supported in such a manner that the spark arrester can be inserted into and removed from the muffler body by being closely attached to the inner peripheral portion of the through hole of the partition. is there. With this configuration, the tail pipe can be easily and reliably supported on the partition by the spacer on the outer periphery of the spark arrester. In addition, the tail pipe can be pulled out by removing the tail pipe fixed to the muffler body with bolts etc. at the time of maintenance and pulling the tail pipe, so that the workability at the time of attachment and detachment can be improved, Maintenance such as inspection and replacement of the tail pipe can be performed very easily. In the present invention, the spacer is
It is preferable that the spark arrester is provided at the rear end of the spark arrestor, substantially at the center in the length direction of the tail pipe.
As a result, the center of the tail pipe can be supported by the partition via the spacer, the weight balance is good, the number of support points is small, and the number of parts is small, so that the cost can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory view of an external appearance of an exhaust system from a motorcycle engine according to the embodiment, FIG. 2 is a longitudinal sectional view of a muffler device with a spark arrestor, and FIG.
(A), (b) is a cross-sectional explanatory view along the line AA and BB of FIG. 2, and FIG. 4 is an explanatory view with the tail pipe removed.

As shown in FIG. 1, the motorcycle includes a cylinder head 10a of an engine 10 mounted on the motorcycle.
, The exhaust pipe 12 extends forward and downward, turns around under the radiator 14, turns rightward, and extends rearward along the right side of the vehicle body. The rear part of the exhaust pipe 12 is connected to the muffler device 16. The muffler device 16 is a muffler device for engine exhaust silencing provided with a screen type spark arrester 40 made of a metal mesh inside, and includes a plurality of exhaust expansion chambers 28a, 28b, 28c.
It is provided with. The whole of the muffler device 16 is cylindrical and long in the front-rear direction, and has a front part with a rearward open trumpet-like shape and a tapered end. The exhaust pipe 12 is inserted from the engine 10 and connected to the front part.

At the tail end of this muffler device 16, as shown in FIG.
8 is welded and fixed, and a substantially funnel-shaped tail flange 20 squeezed rearward is overlapped on the mounting portion 18 and fastened and connected with a plurality of screws or bolts 20a. As shown in FIG. 2, the outer wall portion 22 of the muffler device 16 has a double structure of an outer cover 22a and an inner cylinder 22b, and a peripheral portion is welded to the inner wall of the inner cylinder 22b inside the muffler device 16. A plurality of (two in the embodiment) generally-basin-shaped baffle plates (partition plates or partition walls) 2
A plurality (three in the embodiment) of exhaust expansion chambers (first exhaust expansion chamber 28a, second exhaust expansion chamber 28b, and third exhaust expansion chamber 28c in this order) are formed by the four and 26.
The baffle plate 24 is fixed by welding or the like in a state in which the periphery rises from the plane of the main body and has a wall shape, and the periphery of the wall shape faces rearward and is fitted into the inner peripheral surface of the inner cylinder 22b. Then, three holes 30a, 30b, and 30c are formed in the rear baffle plate 24, and one hole 32 is formed in the front baffle plate 26 by a punching process (burring process) in which edges are raised. It faces forward (see FIGS. 2 and 3).

In the muffler device 16, the exhaust gas that has passed through the exhaust pipe 12 first flows into the third exhaust expansion chamber 28c at the front end. Then, through the baffle plate 24 from the baffle plate 26 (the hole 32
And an opening 30a), an inflow pipe 34 is inserted into the first exhaust expansion chamber 28a at the rear end of the muffler body, and an inflow pipe through which exhaust gas flows from the exhaust expansion chamber 28c on the upstream side. I do. Also, the baffle plate 24 includes
A communication pipe (which may be a communication hole) 36 for communicating the first and second exhaust expansion chambers 28a and 28b with each other is fixedly provided through the baffle plate 24 (by inserting the hole 30b).

Tail pipe 38 for exhausting exhaust gas inside the muffler
From the hole 18a of the mounting portion 18 at the rear end of the muffler body, through the first exhaust expansion chamber 28a, through the baffle plate 24 (through the hole 30c), and into the second exhaust expansion chamber 28b.
And detachably provided.

The tail pipe 38 can be attached to and detached from the tip of a tail pipe 38 located in the second exhaust expansion chamber 28b,
The muffler center axis is one in which the spark arrestor 40 is provided with the arrestor center axis positioned at an eccentric position.
The spark arrester 40 has a bottomed cylindrical shape and is made of a metal mesh, and is fitted over the front end of the tail pipe 40 having many small holes.

Further, a spacer 42 having a substantially semi-cylindrical shape with a chamfered front and rear in cross section is provided integrally or separately so as to surround a portion corresponding to a partition wall on the outer peripheral portion of the spark arrestor 40. The spark arrestor 40 is supported by the spacer 42 so as to be slidably attached to the inner peripheral portion of the through hole of the partition wall so that the spark arrester 40 can be inserted into and removed from the muffler body (see FIGS. 3 and 4). In this case, the spacer 42 is a rear end of the spark arrestor 40,
The tail pipe 38 is provided substantially at the center in the length direction.

The outer diameter d2 of the spacer 42 is larger than the outer diameter d1 of the spark arrestor 40, and the spark arrestor 40 and the tail pipe 38 are supported by the baffle plate 24 via the spacer 42.
Further, the rear end of the tail pipe 38 is fixed to the tail flange 20 by welding or the like, and the diameter of the spacer 42 is formed to be equal to or smaller than the diameter of the hole 18a of the mounting portion 18. As shown in FIG. The spacer 42 is not caught when pulling out from the muffler main body.

In the muffler device for silencing engine exhaust according to the present embodiment, first and second exhaust expansion chambers are provided in a cylindrical muffler body from a rear end of the body toward the front with a baffle plate 24 interposed therebetween. 28a and 28b are formed. Exhaust gas flows into the first exhaust expansion chamber 28a at the rear end of the muffler body from the upstream side through the baffle plate 24 by the inflow pipe 34 and the first exhaust expansion chamber 28a by the communication pipe 36. Exhaust gas flows into the second exhaust gas expansion chamber 28b from the second exhaust gas expansion chamber 28b, and the exhaust gas is discharged from the second exhaust gas expansion chamber 28b to the outside of the muffler body by the tail pipe 38 penetrating through the first exhaust gas expansion chamber 28a. The exhaust gas is reversed in the first and second exhaust gas expansion chambers 28a and 28b, expanded, silenced, and discharged from the tail pipe 38. Accordingly, the length of the tail pipe 38 can be increased, and the installation location of the spark arrestor 40 can be a location recessed from the rear end of the muffler body.

Further, a tail pipe 38 for discharging the exhaust inside the muffler is connected to the first exhaust expansion chamber 2 from the rear end of the muffler body.
The second exhaust expansion chamber 28b passes through the baffle plate 24 through the second exhaust expansion chamber 28b, and is detachably provided. The tail pipe 38 is located in the second exhaust expansion chamber 28b. As shown in FIG. 4, the tail pipe 38 is removed when necessary, such as during maintenance, so that the inspection and replacement of the spark arrester 40 can be facilitated. of course,
Spark arrester 40 provided at the front end of tail pipe 38
Prevents the passage of the sparks contained in the exhaust gas and prevents the sparks from being released from the tail pipe 38. Further, since the spark arrestor 40 is provided with the center of the arrestor located at a position eccentric to the center of the muffler, the tail pipe 3 is located between the inflow pipe 34 and the communication pipe 36.
Even if 8 is attached, the spark arrester 40 can be installed with a margin at the tip thereof, and the diameter of the muffler body does not increase.

A spacer 42 is provided at a position corresponding to the partition wall on the outer peripheral portion of the spark arrestor 40, and the spacer 42 is brought into close contact with the inner peripheral portion of the through hole 30c of the baffle plate 24 so that the spark arrestor 40 is inserted into the muffler body. Since the tail pipe 38 is detachably supported, the tail pipe 38 can be easily and reliably supported on the baffle plate 24 by the spacer 42 on the outer periphery of the spark arrester 40. Also, the rear end of the tail pipe 38 fixed to the muffler body with the bolt 20a or the like is removed at the time of maintenance, and the tail pipe 38 can be pulled out by pulling the tail pipe 38, thereby improving workability at the time of attachment and detachment. Therefore, maintenance such as inspection and replacement of the tail pipe 38 can be performed very easily.

The spacer 42 is provided at the rear end of the spark arrestor 42 and substantially at the center of the tail pipe 38 in the longitudinal direction. It can be supported, has a good weight balance and requires fewer supporting points, and requires a smaller number of parts, so that the cost can be reduced.

[0022]

As described above, since the present invention is constructed as described above, the exhaust gas from the upstream is reversed in the first and second exhaust gas expansion chambers, expanded and silenced, and discharged from the tail pipe. Is done. Therefore, the length of the tail pipe can be increased, and the installation location of the spark arrestor can be located at a location recessed from the rear end of the muffler body. Further, a tail pipe for exhausting the exhaust in the muffler is detachably provided by being inserted from the rear end of the muffler body, passing through the first exhaust expansion chamber, passing through the partition wall, and passing through the second exhaust expansion chamber, and A spark arrester can be attached to and detached from the tip of the tail pipe located in the expansion chamber, and the tail pipe can be removed when required for maintenance or the like, and inspection and replacement of the spark arrester can be easily performed. Of course, the spark arrester provided at the front end of the tail pipe prevents the passage of sparks contained in the exhaust gas, and prevents the discharge of sparks from the tail pipe. In addition, since the spark arrester is provided with the arrestor center located at a position eccentric to the muffler center, even if a tail pipe is attached across the inflow pipe and the communication pipe, a spark arrestor is provided at the tip thereof. The muffler body does not increase in diameter.

In the present invention, a spacer is provided at a position corresponding to the partition on the outer peripheral portion of the arrestor, and the spacer is brought into close contact with the inner peripheral portion of the through hole of the partition so that the spark arrestor can be detachably supported in the muffler body. The tail pipe can be easily and reliably supported on the partition wall by the spacer on the outer periphery of the spark arrester. In addition, the tail pipe can be pulled out by removing the tail pipe fixed to the muffler body with bolts etc. at the time of maintenance and pulling the tail pipe, so that the workability at the time of attachment and detachment can be improved, Maintenance such as inspection and replacement of the tail pipe can be performed very easily.

In the present invention, if the spacer is provided at the rear end of the spark arrestor and substantially at the center in the length direction of the tail pipe, the center of the tail pipe is substantially separated by a partition via the spacer. It can be supported, has a good weight balance and requires fewer supporting points, and requires a smaller number of parts, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an external explanatory view of an exhaust system from an engine of a motorcycle according to an embodiment.

FIG. 2 is an explanatory longitudinal sectional view of a muffler device with a spark arrester.

FIGS. 3 (a) and 3 (b) are cross-sectional explanatory views taken along lines AA and BB in FIG. 2;

FIG. 4 is an explanatory view showing a state in which a tail pipe is removed.

FIG. 5 is a schematic vertical sectional view showing an example of the related art.

[Explanation of symbols]

 16 Muffler device 18 Mounting part 24, 26 Baffle plate 28a, 28b, 28c Exhaust expansion chamber 30a, 30b, 30c Baffle plate through hole 32 Baffle plate through hole 34 Inflow pipe 36 Communication pipe 38 Tail pipe 40 Spark arrestor 42 Spacer

Claims (3)

[Claims] 1. A muffler device for engine exhaust silencing provided with a screen type spark arrestor inside thereof, wherein a first and a second muffler body are disposed inside a cylindrical muffler body from a rear end of the body toward a front side with a partition wall interposed therebetween. A second exhaust expansion chamber is formed, and an inflow pipe for passing exhaust gas from the upstream side through the partition wall is inserted into the first exhaust expansion chamber at the rear end of the muffler body, and the first and second exhaust expansion chambers are connected to each other. A communication passage communicating with the partition is provided through the partition, and a tail pipe for exhausting the muffler is inserted from the rear end of the muffler body through the partition into the second exhaust expansion chamber through the first exhaust expansion chamber. The spark arrester is provided detachably at the tip of the tail pipe located in the second exhaust expansion chamber, and the arrestor center is located at a position eccentric to the muffler center. Spark arrester with a muffler device for a vehicle according to claim. 2. A spark arrester is provided at a position corresponding to a partition on an outer peripheral portion of an arrestor, and the spacer is brought into close contact with an inner peripheral portion of a through hole of the partition to support a spark arrestor so that it can be inserted into and removed from a muffler body. The muffler device with a spark arrestor for a vehicle according to claim 1. 3. The muffler device with a spark arrestor for a vehicle according to claim 2, wherein the spacer is provided at a rear end of the spark arrester and substantially at a center in a longitudinal direction of the tail pipe. .