JPS6093111A - Exhaust device for motorcycle - Google Patents

Abstract

PURPOSE:To improve the efficiency of utilizing an exhaust collecting box to provide a compact exhaust device by connecting a plurality of exhaust pipes of a motorcycle to the exhaust collecting box in the central portion of the car body from one side of the car body and arranging a plurality of mufflers at the same one side as the exhaust pipes. CONSTITUTION:An exhaust collecting box 3 is disposed below the rear portion of an engine in the central portion of a car body in front of a rear wheel, and connecting pipes 4, 6 of an exhaust pipe are arranged at the right side of the car body in front of said box. In front of said box 3 are disposed connecting pipes 4, 6 of an exhaust pipe at the right side of the car body. The connecting pipe 4 is disposed in a lower muffler 8 at the same side and an end 4a of the connecting pipe 4 extends through the side wall 8a of the lower muffler 8 and projects into the exhaust collecting box 3. Also the connecting pipe 6 is located below said box 3 and an end 6a of the pipe 6 extends through the lower wall of said box 3 and projects into said box. And exhaust gas discharged from exhaust discharge ports 9, 10 of the connecting pipes 4, 6 circulates in said box 3 and is introduced in the upper and lower mufflers 11, 8 at the same side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an exhaust system for a motorcycle in which an IJI air collection box is interposed between a D1 trachea connected to a multi-cylinder engine and a muffler.

(Prior art) Generally, in motorcycles equipped with multi-cylinder engines,
A muffler is connected to the 4Jl trachea led out from each cylinder via a 411 gas collection box, and the high-pressure exhaust gas from the #J+ trachea is expanded in the exhaust collection box to lower the pressure, then guided to the muffler and gradually expanded there. , the volume is lowered by interfering with other sources to reduce the noise from the newspapers. In order to reduce exhaust noise by installing an exhaust collection box in the middle of the v1 gas system, the applicant previously proposed the method disclosed in JP-A-56-106051 and JP-A-56-115811. Then, the air pipes led from the multiple cylinders were connected to the exhaust collection box located in the center of the car body between the rear lower part of the engine and the rear wheels, and the air pipes were connected to the exhaust collection box on both sides of the car body. An exhaust system connected to a muffler was provided.

Mufflers are connected to both sides of the exhaust collection box, and the U1 air outlet of the exhaust pipe from each cylinder is formed to face the exhaust inlet of the respective muffler. Therefore, since the ignition timing of each cylinder is different, the exhaust gas repeats expansion alternately in the exhaust gas collection box, but before the exhaust gas reaches 11fiJ throughout the exhaust gas collection box, the air intake inlet of the opposing muffler Therefore, the use of exhaust collection boxes cannot be said to be sufficient.

(Purpose of the Invention) This invention was made in view of the above circumstances, and utilizes the exhaust gas collection box by introducing exhaust gas from each cylinder from one side of the exhaust gas collection box, circulating it inside the exhaust gas collection box, and guiding it to the muffler. The purpose of the present invention is to provide an air conditioning device for a motorcycle that can improve efficiency and make the air collection box more compact.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention has a plurality of exhaust pipes connected to an exhaust collection box, each of which has air outlet 11 from one side of the vehicle body.
At the same time, a plurality of mufflers are arranged on the same side as the υ1 trachea, and the υ1 air inlet of the muffler is connected to the exhaust pipe 11 in the vicinity of the exhaust outlet.
It is characterized by being placed so that it faces in the same direction as the

(Example) An example of the present invention is attached below.
1 (described in detail below).

Fig. 1 is a side view of a motorcycle to which an embodiment of the present invention is applied, Fig. 2 is a partial cross-sectional plan view showing the main parts of the embodiment, and Fig. 3 is a cross-sectional view taken along ■-■ of Fig. 2. , Figure 4 is I of Figure 2.
It is a V-TV end view.

In Fig. 1, reference numeral 1 indicates a V-type engine, with a front cylinder 1a.
and a rear cylinder 1b. An exhaust pipe 2 extends below the engine 1 from the front of the front cylinder 1a, and a loss air collection box 3
It is connected to the connecting pipe section 4 of. Further, an exhaust pipe 5 extends from the rear surface of the rear cylinder 1b to the rear lower part of the engine 1.
It is connected to the connecting pipe section 6 of the JI gas collection box 3.

The exhaust collecting box 3 is disposed at the lower rear of the engine 1 and in the center of the vehicle body in front of the rear wheels 7.
As shown in the figures and FIG. 3, the cross section is rectangular and long in the mold width direction.

At the front of the exhaust gas collecting box 3, the aforementioned connecting pipe portions 4.6 are both arranged on the right side of the vehicle body. This connecting pipe section 4
is disposed inside the lower muffler 8, and the tip end 4a of the connecting pipe portion 4 passes through the side wall 8a of the lower muffler 8 and connects to the exhaust collecting box 3.
protrudes inward. Further, the connecting pipe part 6 is located below the air exhaust collecting box 3, and the tip end 6a of the connecting pipe part 6 is located below the exhaust collecting box 3.
It penetrates the lower wall 3a and projects inside. The exhaust gas outlet ports 9.10 of this connecting pipe section 4.6 are all oriented in the longitudinal direction of the υl gas collecting box 3, and the exhaust gas is directed to the connecting pipe section 4.6.
It expands from there toward the opposite side wall 3b on the left side of the vehicle body of the exhaust collection box 3.

On the right side of the vehicle body, an upper muffler 11 is located above the lower muffler 8, and these mufflers 8 and 11 connect to the connecting pipe section 4.
．． It is arranged on the same side as 6. This lower muffler 8
The exhaust collecting box 3 is connected to the side wall 8a of the exhaust gas collecting box 3, while the upper muffler 11 is moved approximately half a distance rearward than the lower muffler 8 and is connected thereto. The side wall 8a of the lower muffler 8 has an exhaust outlet 12 located above the penetration position of the tip 4a of the connecting pipe 4.
is formed. In addition, the front muffler 1 has a connecting pipe part 13.
1 is connected to the collection box 3 at once, and the connecting pipe part 1
The JJI air inlet [114] of 3 is located above the exhaust outlet [19] of the connecting pipe section 4. The exhaust inlets 12.14 of the lower and partial mufflers 8, 11 open in the same direction as the exhaust outlet 9.10 of the connecting pipe section 4.6.

The inside of the lower muffler 8 is formed into a cavity 17 by a partition wall 15.16.
, 18.19 are defined. The υ1 gas introduced into the cavity 17 is tJl from the air introduction path 20 to the cavity 18,
Then, it passes through a hole (not shown) formed in the partition wall 16 and enters the cavity 19, and then is guided to the exhaust gas introduction path 21, where the pressure of the D1 gas is gradually expanded or caused to interfere with each other, causing a harmless volume. It is lowered to the lower position and guided out to the rear. ” The two-part muffler 1 is similarly constructed.

Next, the operation of this embodiment will be explained.

When the V-type engine 1 is driven, the exhaust gas from the front cylinder 1a passes through the exhaust pipe 2 and the connecting pipe section 4 to the loss collection box 3, and the exhaust gas from the rear cylinder 1b flows to the exhaust gas collection box 3. The air 1↑5 is alternately introduced into the jJl air collection box 3 via the connecting pipe section 6, and since the exhaust gas at this time is under high pressure, the υ1 air collection box 3
It suddenly expands into a single shell and the pressure decreases.

At this time, the air extraction ports 9 and 10 of the connecting pipe sections 4 and 6 are opened toward the long hair direction of the air build-up box 3, and the exhaust gas 1 discharged alternately from each cylinder is expanded to 1. It flows towards the left side wall 3a, and ′! When it touches once, it returns to the right muffler 8.11 direction. This υ1 air gas has expanded by 1 and has a low pressure, and is first discharged from the exhaust outlet [112] to the cavity 17 of the lower muffler 8 without interfering with the inflow of any air. On the other hand, Kanki derivation [114 to contact Fj
A portion of the air is guided to the muffler 11 via the ltR section 13. At this time, D [air introduction "112.14
are oriented in the same direction near the bleed air outlets 9 and 10 of the connecting pipe sections 4 and 6, and the exhaust gas that has circulated in the exhaust collection box 3 and has become low pressure is discharged from the tel air inlet ports 12 and 14, respectively. It is smoothly discharged to muffler 8.11. Since the trapped gas reciprocates inside the exhaust collecting box 3 in this way, the exhaust gas from each cylinder 1a, 1b is sufficiently expanded here and becomes low pressure, making it possible to effectively use the entire inside of the exhaust collecting box 3. Improves usage efficiency.

(Effects of the Invention) As described above, this invention connects a plurality of Jul windpipes to the exhaust collection box from one side of the vehicle body, and arranges a plurality of mufflers on the same side as the exhaust pipes. Exhaust gas is introduced from one side of the exhaust gas collection box through the trachea and expands, and this expanded exhaust gas circulates back and forth inside the air collection box, becoming low pressure and being introduced into the muffler from one direction. Therefore, the JJI weather combination box can be used effectively. Therefore, it is possible to downsize the exhaust collecting box, which is placed between the rear lower part of the engine and the rear wheels and whose length in the longitudinal direction is strictly limited.

[Brief explanation of the drawing]

Fig. 1 is a side view of a 1''11 motor 2 to which an embodiment of the present invention is applied, Fig. 2 is a partially sectional plan view showing the embodiment of the main part,
3 is a cross-sectional view taken along line rn-m of FIG. 2, and FIG. 4 is an end view of FIG. 2.5...4 No. 1 trachea 3...1 collection box 4.6
... Connection pipe section 8.11 ... Muffler 9.10 ...
υ1 Air outlet 12.14...Exhaust inlet Patent applicant Yamaha Motor Co., Ltd.

Claims (1)

[Claims] In the IJI air system for a motorcycle, in which the exhaust pipes led out from each cylinder are connected to an exhaust collection box located in the center of the vehicle body, and a muffler is connected to this air collection box, the plurality of Jj [trachea] The D1 air outlets are connected to the 4Jl air collection from one side of the vehicle body so that they face the same direction, and the plurality of mufflers are respectively arranged on the same side as the exhaust pipe, and the exhaust inlet of the muffler An exhaust system for a motorcycle, wherein the exhaust outlet is provided near the exhaust outlet so as to face in the same direction as the exhaust outlet.