CN102108889A

CN102108889A - Motorcycle silencer

Info

Publication number: CN102108889A
Application number: CN200910250814XA
Authority: CN
Inventors: 吴志畅; 朱琦; 王松; 赵德勇
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2009-12-23
Filing date: 2009-12-23
Publication date: 2011-06-29

Abstract

The invention discloses a motorcycle silencer, which comprises a shell (1) in which chambers are separated. The tail of the shell (1) is enclosed by an end plate (2) with a hole; and the end plate (2) and a clapboard (3) adjacent to the end plate (2) form a tail chamber (1a) on the rear of the shell (1). The motorcycle silencer is characterized in that: a hush pipe (4) is inserted in the end plate (2), and the length of the hush pipe extending into the tail chamber (1a) is 1/2-4/5 of a distance from an air inlet (1b) of the chamber to the end plate (2); and the hush tube (4) has the wall thickness of 3-6mm. The motorcycle silencer can effectively reduce noise, has good silencing effect, and can weaken vibration and abnormal sound generated when an engine is at a high speed; and the hush tube is arranged on the conventional silencer, so that the motorcycle silencer is simple in structure, the material preparation and processing technologies are not changed basically, and the production cost is low.

Description

A kind of noise eliminator of motorcycle

Technical field

The present invention relates to the engine exhaust device, specifically, relate to the silencing apparatus of motorcycle.

Background technique

Silencing apparatus is the important accessory of motorcycle engine, is used to reduce the exhaust sound and the temperature of motor, and the effect of purifying exhaust air is also arranged.At present, most of motorcycle all is the reactive muffler that adopts, it comprises housing, and the front end of housing links to each other with exhaust opening of engine by outlet pipe, is provided with the dividing plate of perforate in the housing, by dividing plate enclosure interior is divided into a plurality of chambers, the high-temp waste gas of motor, in passing through the process of each chamber of silencing apparatus, constantly expands after outlet pipe enters silencing apparatus with high speed, throttling, so repeatedly after the sudden change, acoustic energy obtains decay.It as shown in Figure 1, the tail end envelope of housing 1 has end plate 2, form last chamber 1a by end plate 2, dividing plate 3 and housing 1, on end plate 2, have exhaust port, on end plate 2 plug-in mounting exhaust manifolds 7 are also arranged, it is shorter that the inlet end of these exhaust manifolds 7 stretches into the length of housing 1 the last chamber, the suction port 1b that only is last chamber 1a is to about 1/6 of end plate 2 distances, make the waste expansion enter last chamber 1a, collide end plate 2 backs and just directly near end plate, discharge through exhaust manifolds 7, the buffering route is short, and noise reduction is poor; And the thin rigidity of exhaust manifolds wall is poor, trembles easily during high engine speeds, noise is big, and the internal diameter of exhaust manifolds is for being about 28mm, and large diameter also makes the waste gas of expansion fail throttling sufficiently to decay, and these make that all this kind silencing apparatus noise reduction is undesirable.If but rely on to increase chamber, arranges ventilation cross section more complicated and changeable, and add thick shell and increase its rigidity, can make complex structure again, the manufacture cost rising.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of noise eliminator of motorcycle, and it is simple in structure, low cost of manufacture, can effectively reduce noise, and it is effective to eliminate the noise.

Technological scheme of the present invention is as follows: a kind of noise eliminator of motorcycle, comprise the inner housing that is separated with chamber that divides, the tail end envelope of described housing has the end plate of perforate, the dividing plate of this end plate and vicinity forms the last chamber at housing rear portion, it is characterized in that: on described end plate, be fitted with hush pipe, this hush pipe stretch in the described last chamber length for this chamber suction port to 1/2～4/5 of described end plate distance, the wall thickness of described hush pipe is 3～6mm.

The present invention is installed hush pipe additional on the silencing apparatus end plate, hush pipe stretches in the last chamber longer, make that enter last chamber expansion backlash bumps against waste gas on the end plate, can not just directly discharge from end plate, also need tune to discharge from hush pipe round, so change the air-flow trend, increased the buffer space of gas, effectively reduced noise; Increase the hush pipe of thicker tube wall, the rigidity of silencing apparatus afterbody is improved, improve the natural frequency of silencing apparatus, make the frequency of trembling of its institute's waste discharge gas in time that is higher than high engine speeds, avoid producing resonance, the vibrations and the abnormal sound that produce when weakening high engine speeds; Only increase hush pipe on original silencing apparatus, simple in structure, it is constant substantially with processing technology to get the raw materials ready, and cost of production is low.

Further, be installed with bushing pipe on the outer ring surface of described hush pipe, hush pipe is fixed on the middle part of described end plate by bushing pipe.Lining pipe is replaced by original exhaust manifolds, only need get final product at exhaust manifolds internal fixation hush pipe, and it is more firm that hush pipe is installed like this, and the rigidity of hush pipe and silencing apparatus afterbody is further enhanced.

Further, described hush pipe is positioned at the middle part of described end plate, and the internal diameter of described hush pipe is 16～20mm, and the inlet end of this hush pipe and the suction port of last chamber distance are greater than 17mm.The hush pipe internal diameter is little, can make waste gas carry out throttling once more, its acoustic energy of decaying, and the inlet end of hush pipe and the suction port of last chamber distance can not be too near, directly discharge from hush pipe to avoid waste gas.

The invention has the beneficial effects as follows: can effectively reduce noise, it is effective to eliminate the noise, vibrations that produce in the time of weakening high engine speeds and abnormal sound; Only increase hush pipe on original silencing apparatus, simple in structure, it is constant substantially with processing technology to get the raw materials ready, and cost of production is low.

Description of drawings

Fig. 1 improves preceding structural representation for the present invention.

Fig. 2 is a structural representation of the present invention.

Fig. 3 is the partial enlarged drawing of Fig. 2.

Embodiment

The invention will be further described below in conjunction with drawings and Examples:

As shown in Figure 2, the present invention mainly is made up of housing 1, end plate 2, dividing plate 3, hush pipe 4, bushing pipe 5 and breathing pipe 6.Wherein, housing 1 is a cylindrical shape, there is the tapering necking down its front portion, the eck of necking down links to each other with the outlet pipe that picks out from motor, the tail end of housing 1 is provided with end plate 2, and two dividing plates 3 in housing 1, end plate 2 and the housing 1 weld mutually, and housing 1 inside is divided into three chambers, the dividing plate 3 of end plate 2 and vicinity forms the last chamber 1a at housings 1 rear portion, is fitted with breathing pipe 6 on two dividing plates 3.As shown in Figures 2 and 3, be fitted with hush pipe 4 at the middle part of end plate 2, be welded with bushing pipe 5 on the outer ring surface of hush pipe 4, hush pipe 4 is fixed on the end plate 2 by bushing pipe 5.

Embodiment 1: the internal diameter of hush pipe 4 is about 18mm, wall thickness is about 5mm, long is 81mm, the length that hush pipe 4 stretches in the last chamber 1a is about 61mm, this chamber suction port 1b to the distance of end plate 2 be 81mm, hush pipe 4 stretch in the last chamber 1a length for this chamber suction port 1b to 3/4 of the distance of end plate 2, the suction port 1b of the inlet end of hush pipe 4 and last chamber 1a is apart from being about 20mm.

Embodiment 2: the internal diameter of hush pipe 4 is about 18mm, wall thickness is about 5mm, long is 81mm, the length that hush pipe 4 stretches in the last chamber 1a is about 55mm, this chamber suction port 1b to the distance of end plate 2 be 81mm, hush pipe 4 stretch in the last chamber 1a length for this chamber suction port 1b to 2/3 of the distance of end plate 2, the suction port 1b of the inlet end of hush pipe 4 and last chamber 1a is apart from being about 26mm.

The present invention is work like this: waste gas enters silencing apparatus through outlet pipe, successively through each chamber of silencing apparatus, entering by the breathing pipe on the dividing plate 36 in the process of each chamber, expansion, throttling constantly, acoustic energy is necessarily decayed, and enters the gas of last chamber 1a, is expanding and is colliding and reverse end for end on the end plate 2 to discharge from hush pipe 4 round again, so change the air-flow trend, increased gas buffer space, effectively reduce noise; And the hush pipe 4 of thicker tube wall, the rigidity of silencing apparatus afterbody is improved, improves the natural frequency of silencing apparatus, vibrations that produced when having weakened high engine speeds and abnormal sound, the little internal diameter of hush pipe 4 also makes the waste gas passing rate suddenly change once more, and acoustic energy is further decayed.

Claims

1. noise eliminator of motorcycle, comprise the inner housing (1) that is separated with chamber that divides, the tail end envelope of described housing (1) has the end plate (2) of perforate, the dividing plate (3) of this end plate (2) and vicinity forms the last chamber (1a) at housing (1) rear portion, it is characterized in that: on described end plate (2), be fitted with hush pipe (4), this hush pipe (4) stretch in the described last chamber (1a) length for this chamber suction port (1b) to 1/2～4/5 of described end plate (2) distance, the wall thickness of described hush pipe (4) is 3～6mm.

2. a kind of noise eliminator of motorcycle according to claim 1 is characterized in that: be installed with bushing pipe (5) on the outer ring surface of described hush pipe (4), hush pipe (4) is fixed on the middle part of described end plate (2) by bushing pipe (5).

3. a kind of noise eliminator of motorcycle according to claim 1 and 2, it is characterized in that: described hush pipe (4) is positioned at the middle part of described end plate (2), the internal diameter of described hush pipe (4) is 16～20mm, and suction port (1b) distance of inlet end of this hush pipe (4) and last chamber (1a) is greater than 17mm.