JP3020127U - Scarf - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a muffler with a simple structure, small size, light weight, and high noise reduction effect. [Structure] A primary expansion chamber is connected to a connecting pipe that communicates with an exhaust port of an engine, and a secondary expansion chamber communicated with a narrowed port is formed at one end of the primary expansion chamber by an elastic body such as rubber. The secondary expansion chamber is provided with an exhaust port into the atmosphere.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an abbreviation for a muffler, in particular, a radio control, and this abbreviation is used in the present application. A) A muffler suitable for use in an engine.

[0002]

[Prior art]

 Conventionally, this type of muffler has a single muffler chamber system in which there is a single expansion chamber connected to the engine, a multiple muffler chamber system in which multiple expansion chambers are connected in stages, and a projection plate for the exhaust passage in the expansion chamber. For example, a collision plate method having a complicated maze shape has been proposed, and in practice, these methods are used in combination.

[0003]

[Problems to be solved by the device]

 However, since the conventional engine muffler for radio-controlled models has limited capacity and weight, it is not possible to combine various methods in a complicated manner, and there is a problem that sufficient muffling effect cannot be obtained. .

It is said that the above-mentioned collision plate method or the like has the highest sound deadening efficiency, but this method is complicated in providing a collision plate, so that it is expensive and heavy, and further, pressure loss is large, so that the engine The problem is that it has a large impact on

Further, although the multiple silencing room system has the advantage that it has a higher silencing effect than the single silencing room system, it is still difficult to mitigate high frequency sounds. have.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a muffler having a simple structure, a small size, a light weight, and a high sound deadening effect.

In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned utility model registration claim, meets the above-mentioned object and the primary expansion chamber 1 is connected to the connecting pipe 4 communicating with the exhaust port of the engine. The secondary expansion chamber 2 is formed by an elastic body such as rubber at one end of the primary expansion chamber 1 and is connected to the secondary expansion chamber 2 by a narrowed port 6. This is due to the technical means of providing an exhaust port 5 to the atmosphere.

Further, in the invention of “Claim 2”, the primary expansion chamber 1 is connected to the connecting pipe 4 communicating with the exhaust port of the engine, and the partition wall 60 is provided at one end of the primary expansion chamber 1. A secondary expansion chamber 2 formed of an elastic material such as rubber is continuously provided. One end of the partition wall 60 communicates with the primary expansion chamber 1 as a constriction port 6 and the other end is an exhaust port to the atmosphere. As a reference numeral 5, an exhaust pipe 61 protruding from the outside of the secondary expansion chamber 2 is provided in a projecting manner, and through holes 62, 62, 62 It is a technical measure that is made by opening 62.

Further, in the invention of "Claim 3", the primary expansion chamber 1 is connected to the connecting pipe 4 communicating with the exhaust port of the engine, and the partition wall main body portion 60a is provided at one end of the primary expansion chamber 1. And a partition wall 60 having a peripheral surface portion 60b that can be fitted into the primary expansion chamber 1, a part of the peripheral surface portion 60b is fitted and attached so as to protrude outside the primary expansion chamber 1, A cup-shaped secondary expansion chamber 2 formed of an elastic material such as rubber is fitted and continuously provided on the peripheral surface portion 60b of the partition wall 60, and one end of the partition wall 60 has a narrowed port 6 as a narrowing port 6. An exhaust pipe 61, which protrudes and communicates with the inside of the primary expansion chamber 1 and has the other end as an exhaust port 5 into the atmosphere, and which protrudes outside the secondary expansion chamber 2, is provided in a protruding manner. ., Through holes 62, 62, 62 ... Are bored in the site located in the secondary expansion chamber 2, and the secondary expansion chamber 2 has one end The peripheral surface 60b of the wall 60, in which took technical means formed by fastened with fastening ring 70,70,70 ... the other end on the outer peripheral surface of the exhaust tube 61.

[0010]

Therefore, in the muffler of the present invention, engine exhaust (hereinafter referred to as engine exhaust) flows into the primary expansion chamber 1 through the connecting pipe 4 and is warmly expanded to generate a sharp explosion sound due to rapid expansion. It has the same function as the conventional one.

Further, when the engine exhaust flows into the primary expansion chamber 1, the engine exhaust and the sound waves are expanded and diffused and collide with the inner wall of the primary expansion chamber 1 to attenuate the sound wave energy. Also has the same effect as the conventional one.

Then, engine exhaust flows from the primary expansion chamber 1 through the narrowed port 6 into the secondary expanded chamber 2, and the primary exhaust chamber 1, the narrowed port 6 and the secondary expanded chamber 2 While the sound wave energy is attenuated by resistance and interference during successive passage, it is the same as the conventional multiple muffling chamber method, but in the present invention, the secondary expansion chamber 2 is made of elastic material such as rubber. Since it is formed of a body, it has a function of attenuating the amplitude of the sound wave when the sound wave collides with the inner wall of the secondary expansion chamber 2.

Further, the secondary expansion chamber 2 formed of an elastic body has a property that it is difficult for high frequency sound of 1500 c or more to pass therethrough, and exhibits a function of effectively silencing the high frequency sound in the secondary expansion chamber 2. Is.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, 4 is a connecting pipe which communicates with the exhaust port of the engine, and one end (upper end of FIG. 1) of this connecting pipe 4 is connected and connected to the exhaust port of the engine (not shown) by an appropriate fixing means such as screwing. It is designed to work.

A primary expansion chamber 1 is connected to the connecting pipe 4. The primary expansion chamber 1 is made of a metal material such as aluminum and has a cylindrical shape. A secondary expansion chamber 2 to be described later is connected to one end side and the other end side is sealed with a lid member 1a. The primary expansion chamber 1 and the connecting pipe 4 may be connected coaxially, that is, in a linear shape, but they are connected in a T-shape (to be exact, an inverted T-shape) as illustrated. Alternatively, even when they are connected in a straight line, if the axes of the two are shifted, the inner peripheral surface of the primary expansion chamber 1 functions as a reliable impact plate against the sound waves traveling straight, and the sound deadening effect is not enhanced. This is a conventionally known technique.

Then, at one end of the primary expansion chamber 1, a secondary expansion chamber 2 communicating with the narrowed port 6 is formed by an elastic body such as rubber and is continuously provided.

The narrowed port 6 may be formed by forming a through hole in the partition wall 60 that closes one end side of the primary expansion chamber 1. In the illustrated example, the narrowed port 6 is formed at the center of the partition wall 60. Although provided in places, it is needless to say that, unlike the illustrated example, a plurality of narrowed ports 6, 6, 6 ... May be provided in the eccentric position of the partition wall 60.

In order to connect the secondary expansion chambers 2, the secondary expansion chamber 2 is formed into a cup shape with an elastic material such as rubber, preferably a heat-resistant elastic body. It is fitted on the other end side, to be precise, on the outer peripheral surface of the partition wall 4 attached to the other end side of the primary expansion chamber 1, and is fastened with fastening rings 70, 70. If the expansion chamber 2 communicates with the primary expansion chamber 1 through the narrowed port 6, especially the shape of the secondary expansion chamber 2 and the method of connecting the primary expansion chamber 1 and the secondary expansion chamber 2 Is not limited to the illustrated example.

An exhaust port 5 to the atmosphere is provided at one end of the secondary expansion chamber 2. The exhaust port 5 may be formed by forming a through hole at an appropriate position in the secondary expansion chamber 2.

Therefore, as shown by the arrow P1 from the connecting pipe 4, the engine exhaust gas and the sound wave that have flowed into the primary expansion chamber 1 once expand in the primary expansion chamber 1 and then the arrow P2. As shown by, it is temporarily compressed after passing through the narrowed port 6, flows into the secondary expansion chamber 2 and expands again, and then is exhausted to the atmosphere from the exhaust port 5 as shown by an arrow P3. It is done like this.

Next, the invention of “claim 2” will be described in detail with reference to “FIG. 2”. The primary expansion chamber 1, the lid member 1a, and the connecting pipe 4 are the same as those described above, but the secondary expansion formed by an elastic body such as rubber through the partition wall 60 at one end of the primary expansion chamber 1. A chamber 2 is continuously provided, and one end of the partition wall 60 communicates with the inside of the primary expansion chamber 1 as a narrowed port 6 and the other end thereof serves as an exhaust port 5 to the outside of the secondary expansion chamber 2. An exhaust pipe 61 is formed so as to project through, and through holes 62, 62, 62, ... Are opened in a portion of the peripheral face of the exhaust pipe 61 located inside the secondary expansion chamber 2.

Therefore, the primary expansion chamber 1 and the secondary expansion chamber 2 are communicated with each other through the narrowed port 6, the exhaust pipe 61, and the through holes 62, 62, 62. As shown by the arrow P1 from the connecting pipe 4, the engine exhaust gas and the sound wave that have flowed into the primary expansion chamber 1 once expand in the primary expansion chamber 1 and then the constriction as shown by the arrow P2. The gas is temporarily compressed through the port 6, flows into the secondary expansion chamber 2, expands again, and is then discharged into the atmosphere from the exhaust port 5 as shown by an arrow P3. However, part of the engine exhaust and sound waves enter and leave the secondary expansion chamber 2 through the through holes 62, 62, 62 ... And are diffused in the secondary expansion chamber 2 as well. The sound wave energy will be attenuated by colliding with the inner wall of the sound field. It will be attenuated by the elasticity of the tension chamber 2.

In the “FIG. 1” example, since the secondary expansion chamber 2 is a cantilever type, the secondary expansion chamber 2 vibrates and becomes a sound source, or relatively large amplitude vibrates. Although it may not be a resistance for attenuating the sound energy, the other end of the exhaust stack 61 penetrates to the outside of the secondary expansion chamber 2 as the exhaust port 5 to the atmosphere. One end (right end in the figure) of the secondary expansion chamber 2 is connected to one end of the primary expansion chamber 1 and held, and the other end (left end in the figure) can be held by the exhaust cylinder 61. The vibration of 2 can be reduced.

Next, the invention of “claim 3” will be described in detail with reference to FIG. According to the invention of "Claim 3", the primary expansion chamber 1 is connected to the connecting pipe 4 communicating with the exhaust port of the engine, and the partition body 60a and the primary expansion chamber 1 are connected to one end of the primary expansion chamber 1. A partition wall 60 having a peripheral surface portion 60b that can be fitted into the chamber 1 is fitted and attached so that a part of the peripheral surface portion 60b projects out of the primary expansion chamber 1. In the illustrated example, a concave groove 63 is provided in the circumferential direction in a portion of the peripheral surface portion 60b that projects from the primary expansion chamber 1.

The partition wall 60 has a cup-shaped secondary expansion chamber 2 formed of an elastic material such as rubber, which is fitted to the peripheral surface portion 60b of the partition wall 60 and is continuously provided. That is, the partition wall 60 is used as an original partition wall and also as a connecting member between the primary expansion chamber 1 and the secondary expansion chamber 2, and the opening of the cup-shaped secondary expansion chamber 2 is used. The end side is fitted and connected to the peripheral surface portion 60b. In the illustrated example, an inner flange portion 2a is provided on the inner side of the opening end side of the secondary expansion chamber 2, and the inner flange portion 2a is engaged in the recessed groove 63 to ensure the fitting. There is.

Then, one end of the partition wall 60 is projected and communicated with the narrow expansion port 6 into the primary expansion chamber 1, and the other end is penetrated to the outside of the secondary expansion chamber 2 as an exhaust port 5 to the atmosphere. The exhaust pipe 61 that has come out is provided in a protruding manner, and through holes 62, 62, 62 ... Are opened in a portion of the peripheral surface of the exhaust pipe 61 located inside the secondary expansion chamber 2.

The exhaust tube 61 is formed integrally with the partition wall 60 so as to penetrate the partition wall 60, and the constriction port 6 at one end is projected into the primary expansion chamber 1 to enter the primary expansion chamber 1 to cause sound waves. Stenosis The amount of invasion into the mouth 6 is limited.

The secondary expansion chamber 2 has one end fastened to the circumferential surface portion 60b of the partition wall 60 and the other end fastened to the outer circumferential surface of the exhaust pipe 61 with fastening rings 70, 70, 70 ... . In the illustrated example, a pair of flanges 64, 64 is provided at the tip of the exhaust pipe 61 (on the left end side in the drawing), and one end of the secondary expansion chamber 2 is inserted into the flanges 64, 64. It has been done.

The fastening rings 70, 70, 70, ... may be C-shaped rings made of a spring material, but may be fastened with wire.

[0030]

[Effect of device]

 As described above, the present invention adopts the multiple muffling chamber method, so that the muffling effect is high, and since the secondary expansion chamber 2 is made of the elastic material, the muffling is possible even if the structure is simple and small and lightweight. It is possible to provide a muffler having a high effect, particularly a sound deadening effect in a high frequency range.

Further, in the invention of “Claim 2”, since the other end of the exhaust pipe 61 is formed as the exhaust port 5 to the atmosphere, the second expansion chamber 2 is protruded to the outside. It is possible to provide a muffler that can firmly fix 2 by a double-sided method and that can prevent the generation of sound and the reduction of the silencing effect due to the vibration of the secondary expansion chamber 2.

Further, in the invention of “claim 3”, the cup-shaped secondary expansion chamber 2 formed of an elastic body such as rubber is fitted to the peripheral surface portion 60 b of the partition wall 60 and is continuously provided. The structure is simple and easy to manufacture. The exhaust pipe 61 is formed integrally with the partition wall 60 so as to penetrate the partition wall 60, and the narrowed port 6 at one end is introduced into the primary expansion chamber 1. Therefore, it is possible to provide a muffler in which sound waves are less likely to enter the stenosis 6 and the resistance to the sound waves is increased by that amount, thereby increasing the sound deadening efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing another embodiment.

[Explanation of symbols]

 1 Primary Expansion Chamber 2 Secondary Expansion Chamber 4 Connection Pipe 5 Exhaust Port 6 Constriction Port 60 Partition Wall 60a Partition Wall Main Body 60b Peripheral Surface Section 61 Exhaust Cylinder 62 Through Hole 70 Fastening Ring

Claims (3)

[Scope of utility model registration request] 1. A primary expansion chamber (1) is connected to a connecting pipe (4) communicating with an exhaust port of an engine, and a narrowed port (6) is provided at one end of the primary expansion chamber (1). A muffler in which the secondary expansion chambers (2) communicating with each other are formed by an elastic body such as rubber and are connected to each other, and an exhaust port 5 to the atmosphere is provided in the secondary expansion chamber (2). 2. A primary expansion chamber (1) is connected to a connecting pipe (4) communicating with an exhaust port of an engine, and a partition (60) is provided at one end of the primary expansion chamber (1). A secondary expansion chamber (2) formed of an elastic body such as rubber is continuously provided, and the partition wall (6
0) has one end as a constriction (6) and a primary expansion chamber (1)
An exhaust pipe (61) which communicates with the inside and protrudes outside the secondary expansion chamber (2) as an exhaust port (5) to the atmosphere is projected from the exhaust pipe (61). A muffler having perforations (62, 62, 62 ...) Opened in a portion located in the secondary expansion chamber (2) on the peripheral surface. 3. A primary expansion chamber (1) is connected to a connecting pipe (4) communicating with an exhaust port of an engine, and a partition main body (60a) is provided at one end of the primary expansion chamber (1). A partition wall (60) having a peripheral surface portion (60b) that can be fitted into the primary expansion chamber (1) is projected so that a part of the peripheral surface portion (60b) is outside the primary expansion chamber (1). Then, the partition wall (60) is provided with a cup-shaped secondary expansion chamber (2) made of an elastic material such as rubber on the peripheral surface (60b) of the partition wall (60). Further, one end of the partition wall (60) is projected and communicated with the inside of the primary expansion chamber (1) as a constriction port (6), and the other end thereof is used as an exhaust port (5) into the atmosphere. An exhaust pipe (61) protruding outward from (2) is provided in a projecting manner, and a through hole (6) is formed in a portion located in the secondary expansion chamber (2) on the peripheral surface of the exhaust pipe (61).
2, 62, 62 ...) are opened, and the secondary expansion chamber (2) has one end on the peripheral surface portion (60b) of the partition wall (60) and the other end on the outer peripheral surface of the exhaust stack (61). A muffler that is fastened with fastening rings (70, 70, 70 ...).