JPH0364615A - Exhaust system for motorcycle - Google Patents

Abstract

PURPOSE:To enlarge the volmetric capacity of a muffler without affecting a bank angle by forming the outside section of the muffler arranged toward the side of a rear wheel into a slant surface along the line connecting said outside section with the shoulder portion of the grounding section of the rear wheel. CONSTITUTION:In a motorcycle, respective exhaust pipes connected with the respective cylinders of an engine are bent down below the engine, are branched side to side thereafter, and then, are connected with respective mufflers 12 (12') arranged at the both sides of a rear wheel 2R. In this case, the outside section 15 of each muffler 12 is formed into a slant surface along a line L connecting the shoulder portion 17 of the grounding section 16 of the rear wheel 2R with the muffler side section 15 which is located on the same side as the shoulder portion 17 with respect to a body center line. For example, the muffler 12 is made up out of a muffler main body 13 and of a muffler cover 14 enclosing the outer circumference of the rear end section 12r. The outside section 15 of the muffler 12 is made up out of the muffler cover 14.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an exhaust system for a motorcycle.

(Prior Art and Problems) Utility Model Application No. 53-61545 is known as a muffler for muffling the engine exhaust noise of a motorcycle, and this conventional muffler has a substantially circular cross section and a curved peripheral surface. Ta.

However, in such conventional mufflers,
Since the outer side in the vehicle width direction is formed into a curved surface, there was a problem in that increasing the muffler capacity would reduce the bank angle.

In addition, it is desired to continuously cover the space between the front cowl and the rear cowl of a motorcycle with a cowl, cover, etc., and store the exhaust pipe, muffler, etc. inside, thereby creating a mild appearance. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an exhaust system for a motorcycle that can increase the muffler capacity without affecting the bank angle and can improve the mild appearance.

(Means for Solving the Problems) In order to achieve the above-mentioned problems, the present invention provides an exhaust system for a motorcycle in which a muffler is arranged at a side position of a rear wheel, in which an outer part of the muffler is connected to the outer part and the rear wheel. It is characterized by being formed into an inclined surface approximately along a line segment connecting the shoulder portion of the ground-contacting portion of the ring.

Further, it is preferable that the outer portion of the muffler forms a continuous surface that is integral with the under cowl.

Further, it is preferable that the outer portion of the muffler forms a continuous surface that is integral with the side cover.

Furthermore, the outer part of the muffler can be formed from the outer part of the muffler body.

Furthermore, the outer part of the muffler can be comprised of a muffler cover located outside the muffler body.

(Function) The outer part of the muffler placed on the side of the rear wheel is formed into an inclined surface that roughly follows the line connecting this outer part and the shoulder of the ground-contacting part of the rear wheel, reducing the bank angle. It is possible to expand the muffler capacity without any problems.

Furthermore, by forming a continuous surface where the outer part of the muffler is integrated with the under cowl and the side cover, it is possible to improve the mild appearance of the motorcycle.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a side view of the motorcycle according to the present invention, FIG. 2 is a rear view of the same, and FIG. 3 is a perspective view of the same from diagonally rearward.

The motorcycle 1 includes a front wheel 2F, a rear wheel 2R, a steering handle 3, a seat 4, a foot step 5, a pillion seat 6, a pillion step 7, a chain case 8, and the like. A crossing front cowl 7 is attached. A side cover 10 below the seat 4 and an under cowl 11 adjacent to the bottom of the side cover 10 are provided behind the front cowl 9. Behind this under cowl 11 is a muffler 12.
The rear end portion 12r of is exposed.

The side cover 10 is formed with a toe rest part 10a that causes the front of the pillion step 7 to protrude outward, thereby improving the riding feeling of the rear seat occupant.

FIG. 4 is a side view showing the state with the cowls removed.

In the figure, 20 is a vehicle body frame, 19 is an in-line four-cylinder engine suspended from the vehicle body frame 20, 22 is an air cleaner case, 23 is a carburetor 24, which is a fuel tank, 21 is a radiator, and 26 is a swing arm.

Exhaust pipes 25 are connected to each cylinder of the engine, and these exhaust pipes 25 are bent and gathered below the engine 19, branched to the left and right, and connected to the mufflers 12 and 12°, respectively.

The mufflers 12, 12' are arranged on both sides of the rear wheel 2R. The rear end 12r of the muffler 12 is
It is exposed at the rear of the under cowl 11. Said muffler 1
As shown in FIG. 2, the outer part 15 of the rear wheel 2R is a line segment connecting the shoulder part 17 of the ground contact part 16 of the rear wheel 2R and the muffler outer part 15 on the same side with respect to the vehicle center line. It is formed on an inclined surface roughly along the .

In this embodiment, the muffler 12 includes a muffler body 13,
The muffler main body 13 is composed of a muffler cover 14 surrounding the outer periphery of the rear end portion 12r, and the outer portion 15 of the muffler 12 is composed of the muffler cover 14. Although the left muffler 12 has been described above, the right muffler 12° is similarly configured. That is, the muffler 12
The outer 15° of ゛ is the shoulder 1 of the ground contact portion 16 of the rear wheel 2R.
7° and the muffler outer portion 15°.

FIG. 5 is a side view of the muffler main body, and FIG. 6 is a longitudinal sectional view thereof.

In the figure, 13b is a mounting bracket installed above the rear end 12r of the muffler body 13, 13t is a tail pipe, and the muffler cover 14 that covers the muffler body 13 and the under cowl 11 are shown in FIGS. 1 and 3. As shown in Figure 2, the outer surface forms a continuous surface with the road surface and is integrally disposed, thereby improving the appearance. Further, as shown in FIG. 6, the outer part 15a of the muffler body 13 is also
It is formed into an inclined surface that follows the outer part 15 of 4.

Note that the muffler cover 14 may be omitted and the outer portion 15a of the muffler body 13 may be configured to form a continuous surface between the under cowl 11 and the road surface. At this time, under cowl 1
1 and the outer portion 15a of the muffler body 13 in the same color, it is possible to further improve the sense of unity and continuity in appearance.

FIG. 7 is a longitudinal sectional view of a muffler main body showing another embodiment.

In the previous embodiment, the muffler cover 14 is the muffler body 13.
However, in this embodiment, a muffler cover 34 is provided to cover the muffler main body 33 from the outer part 37 to the upper part 33u. That is, the inner part 45 of the muffler main body 33 is not covered. Then, the muffler cover 34 engages the tongue piece 36 provided on the lower inner surface of the muffler cover 34 with the tongue piece 38 provided on the lower inner side of the outer part 35 of the muffler main body 33, and the upper edge of the muffler cover 34 The provided flange portion 40 is attached to the mounting bracket 39 erected on the upper part of the muffler body 33 with the bolt 4.
1. It is screwed onto the nut 43 and the spacer 42, and is mounted and supported in this way. In this embodiment as well, the outer portion 35 of the muffler cover 34 is constructed in the same manner as in the previous embodiment.

In addition, in the above, the outer part 15.35 of the muffler cover 14.34 may be integrally provided with a resin material so as to form a substantially continuous surface with the side cover 10 adjacent to the upper side. By doing so, the appearance of the rear end portion t2r of the muffler can be improved.

Further, the under cowl 11 and the muffler cover 14.34 may be formed integrally, or the side cover 10 and the muffler cover 14.34 may be formed integrally. 14.34 may be formed integrally. By configuring in this way, the number of parts can be reduced and the installation workability can be improved.

In the above, when the muffler cover 14.34 is made of a resin material, it is possible to protect the muffler cover 14.34 from the heat of the muffler body 33 by attaching a heat insulating material such as glass wool to the back surface of the muffler cover 1434. I can do it.

Furthermore, by constructing the muffler cover 14.34 with a steel plate, the gap between the muffler cover 1434 and the muffler main body 33 can be reduced by omitting a heat insulating material, thereby making it possible to downsize the area around the muffler.

(Effects of the Invention) As is clear from the above description, according to the present invention, the outer part of the muffler disposed on the side of the rear wheel is connected to the line segment connecting this outer part and the shoulder of the ground contact part of the rear wheel. Because it is shaped like a nearly straight slope, it is possible to expand the muffler capacity without affecting the bank angle.

Furthermore, by forming a continuous surface where the outer part of the muffler is integrated with the under cowl and the side cover, it is possible to improve the mild appearance of the motorcycle.

[Brief explanation of drawings]

Figure 1 is a side view of the motorcycle, Figure 2 is a rear view of the same, and Figure 3 is a side view of the motorcycle.
Figure 4 is a side view of the muffler with the cowl removed, Figure 5 is a side view of the muffler body, Figure 6 is a vertical sectional view of the muffler, and Figure 7 is a side view of the muffler with the cowl removed. FIG. 3 is a longitudinal cross-sectional view of a muffler main body showing an example. In the figure, 2R is the rear wheel, 10 is the side cover 11 is the under cowl, 12 is the muffler, 13 is the muffler body, 14
is a muffler cover, 15 is an outer part of the muffler, 15a is an outer part of the muffler, 16 is a ground contact part, 17 is a shoulder part, and L is a line segment. Figure 2-100-

Claims (5)

[Claims] (1) In an exhaust system for a motorcycle in which a muffler is placed on the side of the rear wheel, the outer part of the muffler is arranged approximately along a line connecting the outer part and the shoulder of the ground contact part of the rear wheel. An exhaust system for a motorcycle, characterized in that it is formed on an inclined surface. (2) The exhaust system for a motorcycle according to claim (1), wherein the outer side of the muffler forms a continuous surface that is integral with the under cowl. (3) The exhaust system for a motorcycle according to claim (1), wherein the outer portion of the muffler forms a continuous surface that is integral with the side cover. (4) The exhaust system for a motorcycle according to claim (1), wherein the outer part of the muffler comprises an outer part of a muffler main body. (5) The exhaust system for a motorcycle according to claim (1), wherein the outer part of the muffler comprises a muffler cover located outside the muffler main body.