JPH0752327Y2 - 2-cycle engine silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a muffler for a two-cycle engine incorporated in, for example, a motorcycle, a scooter, a minibike, an off-road, a sports car, or the like.

(Prior Art) Generally, this type of two-cycle engine silencer is
It is constructed as shown in FIGS. 4 and 5.

That is, in FIG. 4 and FIG. 5, a front wheel 2 and a rear wheel 3 are axially mounted in front of and behind a diamond-shaped frame 1 in a motorcycle, and the front end portion of the frame 1 above the front wheel 2 is axially mounted. An operation handle 4 is provided at 1a. A well-known two-cycle engine 5 is mounted in the middle of the frame 1, and a muffler 7 is connected to an exhaust port 5a of the two-cycle engine 5 through an exhaust pipe 6. That is, as shown in the enlarged view of FIG. 5, the muffling device 7 has a plurality of muffling holes 9 formed in a part of the baffle pipe 8, and the outer cylindrical body is provided outside the muffling hole 9.
10 is configured to form a muffling chamber 11.

Therefore, the silencer for the above-mentioned two-cycle engine is
When the cycle engine 5 is driven, engine noise is exhausted together with the exhaust gas through the exhaust pipe 6 to the muffler 7. Here, the noise together with the exhaust gas is muffled through the plurality of muffler holes 9 into the muffler chamber 11 of the outer cylinder body 10. It is designed to flow into the interior and expand rapidly to silence the sound.

In particular, the muffler of the above-mentioned two-cycle engine also has a function of adjusting the exhaust pressure, so normally one cylinder is equipped with one muffler, but with the appearance design and the increase of the bank angle, the muffler described above is installed. Since the tail pipe connected to the chamber (silence chamber) 11 tends to be long, the exhaust pressure can be adjusted by the length of the tail pipe, so that the silencing performance does not change even if the exhaust pressure is reduced.

(Problems to be solved by the invention) However, although the above-described silencer for a two-cycle engine is usually equipped with one cylinder per cylinder, considering the noise regulations that become stricter year by year, the entire apparatus is further reduced. However, there is a problem in the external design due to its large size, and an effective and appropriate silencer for a 2-cycle engine is desired.

The present invention has been made in view of the above-mentioned circumstances, and is a two-cycle system in which the size of the entire device is reduced and the strength of a tail pipe and the like is improved while taking into consideration the stricter noise regulation year by year. It is an object to provide a silencer for an engine.

[Constitution of device]

(Means for Solving the Problem and Its Action) The present invention relates to a silencer connected to an exhaust port of a two-cycle engine having two or more cylinders, and at least two cylinders of exhaust pipes extending rearward from the engine. Exhaust pipes are arranged vertically side by side close to one side of the vehicle body, and a large number of muffling holes are formed in a part of the baffle pipes connected to the exhaust pipes, and the baffle pipes arranged vertically. , Together with the sound deadening hole is inserted into one outer cylinder forming the sound deadening chamber so that the sound deadening hole is located in the outer hollow body, and a glass wool mat is stacked and loaded in the sound deadening chamber so as to surround the sound deadening hole. Noise from the exhaust gas flows from the muffling hole into the glass wool mat in the muffling chamber and expands rapidly to muffle the sound, reducing the size and weight of the entire device and improving the strength of the tail pipe and other components. It is intended to.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the present invention, the same components as those in the conventional example will be described with the same reference numerals.

1 to 3, reference numeral 1 is a motorcycle frame, for example, of a diamond shape, and front and rear wheels 2 and 3 are axially mounted on the front and rear of the frame 1, respectively. Front end 1a of the above frame 1 above
An operation handle 4 is provided on the. A two-cycle engine 5 having at least two cylinders is mounted in the middle of the frame 1, and exhaust pipes 15 and 16 are connected to the exhaust ports 5a of the two-cycle engines 5, respectively. The exhaust pipes 15 and 16 respectively extend rearward and are arranged vertically adjacent to one side of the vehicle body, and a muffler 17 is provided at the tip end of the exhaust pipes 15 and 16.

The silencer 17 is configured as shown in an enlarged scale in FIGS. 2 and 3.

That is, the baffle pipes 18 and 19 are connected to the ends of the exhaust pipes 15 and 16, respectively.
A plurality of muffling holes 18a, 19a are formed on the outer circumference of 18, 19. The baffle pipes 18 and 19 are inserted into an outer cylinder body 20 forming a muffling chamber 21, and are connected to each other by the outer cylinder body 20. Then, the sound deadening holes 18a and 19a are formed in the outer cylindrical body 20.
A plurality of sheet-shaped glass wool mats 22 are stacked and loaded in the muffling chamber 21 so as to surround the muffling holes 18a and 19a.

Therefore, when the two-cycle engine 5 having two or more cylinders is driven, engine noise is exhausted together with the exhaust gas through the exhaust pipes 15 and 16 to the silencer 17, where the noise together with the exhaust gas is emitted through the silencer holes 18a, 19a to the silencing chamber 21 of the outer cylinder 20
At the same time as they flow in and expand rapidly, they are silenced by the plurality of glass wool mats 22.

Particularly, in the case of the two-cycle engine 5 having two or more cylinders, the simultaneous two-cylinder / two-cycle explosion operation is not performed because it impairs the balance at the time of driving, so the explosion operation is shifted by 180 °. Therefore, one two-cycle engine 5 and the other two-cycle engine 5 alternately perform an explosive operation,
The exhaust gas alternately flows into the silencing chamber 21, and silencing of the two cylinders is performed by one silencing device. That is, a muffling effect for two pieces can be obtained.

Therefore, the present invention reduces the size and weight of the entire apparatus, and since the outer tubular body 20 connects both of the baffle pipes 18 and 19, the strength of the tail pipe and the like is improved and the exhaust gas and It is possible to eliminate the noise and vibration.

[Effect of device]

Since the present invention is configured as described above, one muffling chamber can be commonly used for muffling the exhaust gas from two or more cylinders.
It has an excellent effect that the size and weight of the entire device can be reduced, noise and vibration can be eliminated at the same time, and the strength of the tail pipe and the like can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle equipped with a muffler for a two-cycle engine according to the present invention, FIG. 2 is an enlarged sectional view showing an essential part of the present invention, and FIG. 3 is a chain line A in FIG. Fig. 4 is a cross-sectional view taken along the line -A, Fig. 4 is a side view of a motorcycle equipped with the already proposed two-cycle engine silencer, and Fig. 5 is a main part of the already proposed two-cycle engine silencer. It is an expanded sectional view showing. 1 ... frame, 5 ... 2-cycle engine, 15, 16 ...
… Exhaust pipe, 17 …… Silencer, 18,19 …… Baffle pipe, 18a, 19a …… Silencer hole, 20 …… External cylinder, 21 …… Silencer room, 22 …… Glass wool mat.

Claims (1)

[Scope of utility model registration request] 1. A muffler connected to an exhaust port of a two-cycle engine having two or more cylinders, wherein exhaust pipes extending rearward from the engine for at least two cylinders are arranged close to one side of a vehicle body. And the upper and lower baffle pipes connected to the respective exhaust pipes are provided with a number of muffling holes, and the upper and lower baffle pipes together form one muffling chamber. A sound deadening device for a two-cycle engine, characterized in that the sound deadening hole is inserted into a cylinder so that the sound deadening hole is located inside the outer hollow body, and a glass wool mat is stacked in the sound deadening chamber so as to surround the sound deadening hole. .