JPS63199191A - Exhauster for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the arrangement of a trachea for a motorcycle, particularly a trachea.

[Rice Plate I] In a motorcycle, the exhaust pipe taken out from the engine extends rearward along the heavy body. In a 2-cycle engine, this exhaust pipe gradually swells from the exhaust inlet and reaches its maximum diameter in order to increase air retention efficiency by utilizing the inertia effect of the exhaust gas inside the exhaust pipe! After ζ, a shape that gradually shrinks and has a considerably narrowed outlet is generally adopted.

FIG. 1 shows a conventional motorcycle equipped with such an exhaust pipe. 01 is the front wheel, 02 is the rear wheel, 03 is the engine,
A fuel tank 04 is mounted above the engine 03 across a main frame 05, and a seed 06 is provided behind it. The exhaust pipe 07 extends forward from the cylinder part of the engine 03, first extends in the direction of ], then extends in the width direction of the vehicle body, reaching the rt direction, and extends to the lower side of one side of the fuel tank 04, which has a U-shaped cross section and straddles the main frame 05. It extends to the rear of the vehicle body along the line and is connected to the silencer type 08. On the side of the engine 03 is a kick pedal 0 for starting the engine with your foot.
9 is provided, but the exhaust pipe 07 is disposed above this kick pedal 09, and therefore, as shown in FIG.
is higher than the bottom 04b of the other leg, and is higher than the bottom 04b of the other leg.
4a There is an exhaust pipe 0 between the kick pedal 09 and the pedal 010.
7 is included.

Furthermore, Japanese Patent Application Laid-open No. 163074/1983 discloses a motorcycle in which the exhaust pipe is arranged along the main frame at a height level equivalent to that of the fuel tank. As shown in Fig. 3, the fuel tank 04 is provided only on one side of the main frame 05, or as shown in Fig. 4, the fuel tank 04 is provided on the left and right tanks 011, 01.
These tanks 011 and 012 are each attached to the vehicle body from the side.

However, in the case shown in Fig. 2, the tank bottom 04a on one side must be made higher, which reduces the capacity of the fuel tank and causes the weight of the fuel tank to become unbalanced between the left and right sides. Become. The same applies to the one in FIG. In the case shown in FIG. 4, the left-right imbalance in the weight of the fuel tank can be avoided, but since two fuel tanks must be attached, the number of parts and man-hours are increased.

The present invention solves the problems of the conventional device as described above. Therefore, in the present invention, the engine is disposed below the fuel tank, and the engine is placed on one side of the engine. In the motorcycle provided with a kick-type starting device, the exhaust pipe of the engine is disposed through the inside of an arm portion that connects a foot portion of the kick-type starting device and a shaft support.

According to the present invention, since the exhaust pipe is disposed at a low position inside the arm of the kick-type starter (kick pedal),
Install an exhaust pipe:! ! ! The bottom of the fuel tank on the rear side can also be made lower like the bottom on the other side.

Therefore, it is possible to mount a fuel tank with a large capacity and with balanced mold foils on both the left and right sides.In addition, by arranging the exhaust pipe low, the center of gravity is also lowered. 11] of the fuel tank is made narrower than the width of the fuel tank so that the driver can sit astride the seat in a good riding position, but the exhaust pipe is placed downward as shown above. By doing so, the exhaust pipe does not protrude outward from the line on the side of the vehicle that connects the step part and the fuel tank, ensuring the above-mentioned good riding posture. Since it is passed inside the starting device, it is protected by the kick start position.

The present invention will be described below with reference to one embodiment of the present invention. FIG. 5 is an overall side view of an off-road motorcycle to which the present invention is applied. A front wheel 4 is supported at the front of the vehicle body frame 1 via a front wheel A 3 which is pivotally supported by a head pipe 2, and a rear wheel A is pivotally connected to the rear lower part of the vehicle body frame 1 so as to be able to swing up and down and extends rearward. A rear wheel 6 is supported at the rear end of the rough oak 5. A rear cushion 7 is provided between the rear fork 5 and the vehicle upper structure via a link 20, and the engine 8 is mounted on the vehicle body frame 1 in front of the rear cushion 7. has been done. Engine 8 is a two-stroke engine. A fuel tank 9 is provided above the engine 8, and as shown in FIG.
It has a letter-shaped cross section and is attached to a main pipe 10 extending rearward from the head pipe 2 and forming a part of the vehicle body frame 1, straddling the main pipe 10 from above. A seat 11 is provided behind the fuel tank 9, and the seat 11
The front part of the fuel tank 9 covers the rear rear surface of the fuel tank 9.

Steps 12 are provided on both sides of the lower part of the vehicle body frame 1 in a protruding manner, on which a driver sitting astride the seat 11 rests his/her feet while driving.

Reference numeral 13 denotes a kick pedal (kick type starting device) for the driver to start the engine 8 with his or her foot. Arm part 1 extending upward along the side part
G, and a step portion 17 that projects laterally from the upper end of the arm portion 16. This single peggle 13 is normally arranged with the foot 17 along the side of the vehicle body as shown in the figure, but by rotating the arm 16 by 90 degrees in the horizontal direction, the foot 17 can be moved along the side of the vehicle body. In this state, the engine 8 can be started by kicking the foot 17 with the foot to rotate the kick shifter 14. JJI from the cylinder part 8a of the engine 8? ff1
8 extends forward, curves downward and sideways, and then slightly L.
The kick pedal 13 extends rearward through the inside of the arm portion 16 of the kick pedal 13. The middle part of this exhaust pipe 18 is iY
A large expansion chamber 18a is formed, and a small diameter portion 18b that follows this is a glide suppressor 1 at the rear of the vehicle body.
9 is connected.

In this embodiment, the exhaust pipe 18 is disposed through the inside of the arm portion 16 of the kick pedal 13, so as can be clearly seen by comparing FIG. 6 and the above-mentioned FIG. 2, the position of the exhaust pipe 18 is This makes it possible to lower the bottom 9a of the fuel tank 9 on the side where the exhaust pipe 18 is disposed to the same height as the bottom 9b on the other side.

Therefore, as the capacity of the fuel tank 9 increases 1, the left and right Φ-crosses become balanced. Further, by lowering the positions of the tank bottom 9a and the exhaust pipe 18, the center of gravity of the vehicle also decreases. moreover,
The exhaust pipe 18 is protected from the outside by the kick pedal 13.

As shown in FIG. 7, the step 12 is numbered so as to protrude left and right from both ends of the cross member 1a of the vehicle body frame. As shown in the figure, the glands ρ and tJ that connect these are in a state of widening from the top to the bottom, and S!・The driver who was in the lead at 11 had his knees and legs lined up.
ρ), step 1 on both sides with your feet naturally and effortlessly.
It is placed on top of 2 and is visible. In this embodiment, as shown in FIG. 7(a), the exhaust pipe 18 is connected to one pedal 1.
Since the kick pedal 13 is disposed inside the arm portion 1G of No. 3, the existence of the exhaust pipe 18 prevents the kick pedal 13 from protruding outward from the FJJI, thereby ensuring a good riding posture for the driver as described above. On the other hand, when the exhaust pipe 18 is arranged inside the tread part 11 of the kick pedal 13 as shown in FIG. is inhibited.

As shown in FIG. 8, the rear cushion 7 has its upper end attached to the top of the vehicle body frame 1, and its top end attached to a link pad 20 provided between the frame A7 and the vehicle body frame 1 (FIG. 1). reference)
One line is provided along the center plane of the vehicle body.

The exhaust pipe 18 is disposed on the left side of the vertical cushion 7, and an intake system consisting of a vaporizer 2, an air cleaner, etc. is located on the 6 side of the vertical cushion 7 (almost at the same height as the exhaust pipe 18). In Fig. 8, 21 indicates the connection between the carburetor and the air cleaner of this intake system.By symmetrically arranging the exhaust system and the intake system in this way, space can be used effectively. Since the vehicle body frame 1 can be formed laterally symmetrically, the frame structure is simplified.

Hereinafter, as shown in (g), in the present invention, an engine is disposed below a fuel tank, and a two-wheeled motor vehicle is provided with a kick-type starting device on one side of the engine, and the exhaust pipe of the engine is is installed through the inside of the arm that connects the foot and shaft of the kick type starter, and then the fuel tank is placed above the engine [the height of the bottom of the tank is equal to the exhaust pipe].
Therefore, a large capacity fuel tank with balanced weight on both left and right sides can be mounted on a single boat, and the center of gravity can also be lowered. Further, the trachea is protected by the kick-type starting device, and the kick-type starting device does not protrude from the side of the vehicle body.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional motorcycle, Fig. 2 is a schematic sectional view taken along line ■-■ in Fig. 1, and Figs. 3 and 4 are Fig. 2 showing other conventional examples. Similar sectional views, FIG. 5 is a side view of a motorcycle to which the present invention is applied, FIG. 6 is a schematic sectional view taken along line Vl-Vl in FIG. 5, and FIG. 7 is for detailed explanation of the present invention. FIG. 8 is a schematic sectional view taken along the line ■--■ in FIG. 5. 1...Vehicle frame, 2...Head pipe, 3...
・Front fork, 4...Front wheel, 5...V fork, 6...Rear wheel, 7...Rear shock, 8...
・Engine, 9...Fuel tank, 10...Main pano, 11...Seat, 12...Step, 13.
...Kick pedal, 14...°Hair-Tsukushi Theft, 1
5... Axis support, 1G... Arm part, 17... Step part, 18... Exhaust pipe, 19... Siren (su, 20.
...Link mechanism, 21...Intake system.

Claims (1)

[Claims] In a motorcycle in which an engine is disposed below a fuel tank and a kick-type starting device is provided on one side of the engine, an arm portion that connects an exhaust pipe of the engine to a foot and a shaft portion of the kick-type starting device. An exhaust system for a motorcycle, characterized in that the exhaust system is installed through the inside of the motorcycle.