JPH06101470A - Exhaust gas muffler device for motorcycle - Google Patents

Abstract

PURPOSE:To protect auxiliary devices, such as an air cleaner, installed in the vicinity of a muffler body from a thermal damage by reliably shielding a radiant heat from the vicinity of a muffler body connection part. CONSTITUTION:An exhaust gas muffler device 21 for a motorcycle is formed such that a muffler body 25 has a pair of left and right body halves 25L and 25R joined together at a central part and a muffler cover (an upper muffler cover 40) with which the surface of the muffler body 25 is covered is fixed with a gap between a muffler body 25 surface and the muffler cover. In the exhaust gas muffler device, the fixing parts (nuts 41) of the muffler cover 40 are arranged at least in one or more spots at each of the left and right body halves 25A and 25R, and the muffler cover 40 is fixed to the muffler body 25 in a state to be astride the connection part 35 of the muffler body 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust muffler device for a motorcycle equipped with a muffler cover for preventing heat damage.

[0002]

2. Description of the Related Art Exhaust muffler devices generally used for motorcycles, especially scooter type motorcycles,
As shown in the cross section in FIG. 6, a muffler body 101, which is the main body of the exhaust muffler device 100, is configured by joining a pair of left and right body halves 101L and 101R by welding or the like at the center.

The left and right body halves 101L, 101R
A heat insulating and sound deadening material 102 such as glass wool is applied to the inner circumference of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall 103, and inner plates 103L and 103R are provided so as to press the heat insulating and sound deadening material 102 from the inside. The inner plates 103L and 103R are generally formed of a porous plate such as a punching plate, and are fixed to the vicinity of the joints 104 and 105 of the body halves 101L and 101R by spot welding or the like.

A muffler cover 106 is provided on the side of the muffler body 101 so that the rider's feet and passengers' feet do not come into direct contact with the hot muffler body 101. The muffler cover 106 is generally fastened to a nut 107 fixed to the surface of the muffler body 101 with a screw 108 or the like, and is fixed to the surface of the muffler body 101 via a gap.

[0005]

By the way, in order to comply with exhaust gas regulations of each country, which are becoming stricter year by year, a catalyst has recently been installed in an exhaust muffler device of a motorcycle. When a catalyst is provided in the exhaust muffler device 100 shown in FIG. 6, a catalyst component such as platinum is carried on the inner plates 103L and 103R by thermal spraying, or the inner plates 103L and 103R and the heat insulating and silencing material 10 are used.
A method of interposing a cross-shaped catalyst between the two and the like is adopted.

However, by providing the catalyst as described above, the temperature in the muffler body 101 is significantly increased by the reaction heat between the catalyst and the exhaust gas, and the muffler body 10
The harmful effect that the radiation heat from 1 becomes large occurs. As shown in FIG. 6, an inner plate 103 is provided near the joints 104 and 105 of the left and right body halves 101L and 101R.
Since the welding margins of L and 103R are overlapped, the joint 10
The heat insulating and sound deadening material 102 is not provided in the vicinity of 4, 105, so that the radiant heat is mainly generated in the joint portions 104, 1
Radiated from around 05 to the outside.

However, particularly in a scooter type motorcycle, since auxiliary equipment such as an air cleaner box made of synthetic resin or the like is arranged directly above the muffler body 101, the vicinity of the joint 104 on the upper side of the muffler body 101. There is a risk that the above-mentioned auxiliary machinery may be damaged by the high heat emitted from the above.

In order to prevent such heat damage, conventionally, measures such as extending the upper side of the muffler cover 106 toward the joint portion 104 side and covering the upper portion of the joint portion 104 with an eaves shape have been taken. However, in this case, the vicinity of the joint 104 cannot be widely covered and the muffler cover 106 cannot be firmly fixed.

The present invention has been made to solve the above-mentioned problems, and reliably shields radiant heat from the vicinity of the muffler body joint, and protects auxiliary machinery installed near the muffler body from heat damage. It is an object of the present invention to provide an exhaust muffler device for a motorcycle that can be used.

[0010]

In order to achieve the above object, in an exhaust muffler device for a motorcycle according to the present invention, a muffler body is formed by joining a pair of left and right body halves at a central portion. In a motorcycle exhaust muffler device in which a muffler cover that covers the surface of the body is fixed via a gap between the muffler body surface and a fixing portion of the muffler cover, which is provided on at least one or more places on the left and right body halves respectively, It is characterized in that the muffler cover is fixed to the muffler body so as to straddle the joint portion of the muffler body.

[0011]

By configuring the exhaust muffler device of the motorcycle in this way, the muffler cover can cover the vicinity of the joint of the muffler body over a wide range, and the radiant heat from the joint is reliably shielded. . Moreover, the muffler cover can be firmly fixed to the muffler body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a right side view of a motorcycle to which an exhaust muffler device according to the present invention is applied. This motorcycle 1 has a general scooter type vehicle body layout, and a front fork 4 pivotally supporting a front wheel 3 is mounted on a handlebar 5 on a forehead of an underbone type vehicle body frame 2.
Along with this, the body frame 2 is pivotally mounted so as to be rotatable left and right, and the rear portion of the vehicle body frame 2 is an article storage portion 6 made of, for example, a steel plate monocoque.

A seat 7 is placed on the article storage 6 so as to be openable and closable, and a space between the seat 7 and the handlebar 5 is deeply inserted downward to mount a rider's foot on a floor step 8. Are formed. The body frame 2 is entirely covered with a frame cover 9 made of synthetic resin or the like.

For example, in the lower center of the body frame 2, a link 11 is pivotally mounted so as to be elastically rotatable around a support shaft 12, and a pivot shaft 13 erected at the rear end of the link 11
A power unit 14, which is generally used for scooters, is swingably connected, and a rear wheel 15 is pivotally supported at the rear portion thereof.

A shock absorber 16 is connected between the rear portion of the power unit 14 and the rear portion of the vehicle body frame 2 so as to buffer the swing shock of the rear wheel 15 in the vertical direction during traveling.

Engine part 1 of the power unit 14
7 includes a cylinder 18 extending forward, and an exhaust muffler device 21 according to the present invention is connected to an exhaust port 19 formed on the lower surface of the cylinder 18. The exhaust muffler device 21 is fixed to the engine portion 17 by, for example, a bolt 22 and extends rearward through the right side portion of the rear wheel 15. An air cleaner 23 for purifying intake air of the engine portion 17 is arranged above the exhaust muffler device 21. For example, this air cleaner 23 is provided.
A front end portion and a rear end portion thereof are fixed to the engine portion 17 and the exhaust muffler device 21 by bolts 24, respectively.

FIG. 2 is a right side view of the exhaust muffler device 21, FIG. 3 is a plan view of the exhaust muffler device 21, and FIG. 4 is a vertical sectional view taken along line IV-IV of FIG. An example is shown.

The muffler body 25, which is the main body of the exhaust muffler device 21, includes a pair of left and right body halves 25L and 25R.
It is of a general "center-matching structure" in which the central portion is joined by welding or the like, and an exhaust pipe 26 and a silencer 27 are connected to the front and rear ends thereof, respectively.
A flange 28 for fixing to the exhaust port 19 is provided at the tip of the exhaust pipe 26. A muffler supporter 30 for fixing the exhaust muffler device 21 to the engine portion 17 and an air cleaner bracket 31 for supporting the rear portion of the air cleaner 23 are fixed to the surface of the muffler body 25.

As shown in FIG. 4, the heat insulating and sound deadening material 32 is applied to the inner circumferences of the body halves 25L and 25R which form the muffler body 25. The heat insulating and sound deadening material 32 is pressed from the inside to the inner plate 33L. , 33R are fixed. The inner plates 33L, 33R are made of a porous plate such as a punching plate, and the welding margin 34 provided on both inner plates 33L, 33R is
Left and right body half 25L, 25 by spot welding etc.
It is fixed near the R joints 35 and 36. A cross-shaped catalyst 37 is interposed between the heat insulating and sound deadening member 32 and the inner plates 33L and 33R.

As shown in FIGS. 2 to 4, the muffler body 2
5, a side muffler cover 39 and an upper muffler cover 40 covering the surface of the muffler body 25 are provided on the right side surface and the upper surface.
Are fixed through the gap.

As shown in FIG. 5, several nuts 41 serving as fixing portions of the side muffler cover 39 and the upper muffler cover 40 are fixed to the surface of the muffler body 25 by welding or the like. The side muffler cover 39 and the upper muffler cover 40 are provided with screws 4 41.
2 and the like, and the thickness of the nut 41 forms a gap between the muffler covers 39 and 40 and the muffler body 25.

The side muffler cover 39 prevents the rider's and passenger's feet from directly touching the muffler body 25 which emits high heat. The upper muffler cover 40 protects the radiant heat from the muffler body 25 from the air cleaner 23 and the like. It works to prevent heat damage to machinery. The heat insulating effect can be greatly improved by attaching the heat insulating material 43 to the back surface of the upper muffler cover 40.

In the present invention, at least one nut 41 for fixing the upper muffler cover 40 is provided on each of the left and right body halves 25L and 25R forming the muffler body 25.
Is fixed to the muffler body 25 so as to straddle the upper joint portion 35 of the muffler body 25.

In this embodiment, the upper muffler cover 40 is fixed by using, for example, two nuts 41. The nut 41 for fixing the front portion of the upper muffler cover 40 is provided on the right body half 25R, and the upper muffler is attached. Cover 40
The nut 41 for fixing the rear part of the body half 25 on the left side
It is provided at L.

By fixing the upper muffler cover 40 to the muffler body 25 in this manner, the upper muffler cover 40 can cover the vicinity of the upper joint portion 35 of the muffler body 25 over a wide range. As shown in FIG. 4, since the heat insulating and sound deadening material 32 is not provided inside the joint 35, the high heat generated by the reaction of the exhaust gas with the catalyst 37 is radiated to the outside from the vicinity of the joint 35. Since the upper muffler cover 40 covers the vicinity of the joint portion 35 over a wide range to surely block the radiant heat, there is no possibility that the air cleaner 23 arranged immediately above the joint portion 35 is damaged by heat.

Moreover, the upper muffler cover 40 can be firmly fixed to the muffler body 25. For example, a stay is provided on the upper muffler cover 40 to provide the air cleaner 23.
It becomes possible to support auxiliary equipment such as.

The side muffler cover 39 and the upper muffler cover 40 may be integrally formed.

[0029]

As described above, in the exhaust muffler device for a motorcycle according to the present invention, a muffler body is constructed by joining a pair of left and right body halves at a central portion.
In a motorcycle exhaust muffler device in which a muffler cover that covers the surface of the muffler body is fixed through a gap between the muffler body surface and the muffler cover, the fixing portion of the muffler cover is provided at least at one or more places on the left and right body half bodies It is characterized in that the muffler cover is fixed to the muffler body such that the muffler cover is provided so as to straddle the joint portion of the muffler body.

Therefore, the muffler cover can cover the joint portion of the muffler body over a wide range, and the radiant heat from the joint portion can be surely shielded. Therefore, auxiliary equipment such as an air cleaner arranged near the muffler body can be provided. There is no danger of heat damage to the kind. Moreover, the muffler cover can be firmly fixed to the muffler body.

[Brief description of drawings]

FIG. 1 is a right side view of a motorcycle to which an exhaust muffler device according to the present invention is applied.

FIG. 2 is a right side view of the exhaust muffler device.

FIG. 3 is a plan view of an exhaust muffler device.

FIG. 4 shows an embodiment of the present invention and is taken along line IV-IV of FIG.
FIG. 3 is a vertical cross-sectional view of the exhaust muffler device taken along the line.

FIG. 5 is a plan view of an exhaust muffler device with a muffler cover removed.

FIG. 6 is a vertical cross-sectional view of an exhaust muffler device showing a conventional technique.

[Explanation of symbols]

 1 Motorcycle 21 Exhaust muffler device 25 Muffler body 25L, 25R Body half body 35 Joint of muffler body 40 Upper muffler cover 41 Nut to be a fixed part of muffler cover 42 Screw

Claims (1)

[Claims] 1. A muffler body is constructed by joining a pair of left and right body halves at a central portion, and a muffler cover that covers the surface of the muffler body is fixed to the muffler body surface via a gap. In an exhaust muffler device for a motorcycle, at least one fixing portion of the muffler cover is provided on each of the left and right body halves, and the muffler cover is fixed to the muffler body so as to straddle the joint portion of the muffler body. Exhaust muffler device for motorcycles.