CN100392215C

CN100392215C - Front muffler

Info

Publication number: CN100392215C
Application number: CNB2005800005358A
Authority: CN
Inventors: 朴世钟; 姜宁圭; 徐昊撤; 崔世勳; 文钟允
Original assignee: Sejong Industrial Co Ltd
Current assignee: Sejong Industrial Co Ltd
Priority date: 2004-08-20
Filing date: 2005-08-19
Publication date: 2008-06-04
Anticipated expiration: 2025-08-19
Also published as: CN1806102A; KR100525766B1; WO2006019286A1

Abstract

A front muffler to discharge exhaust gases is disclosed. The front muffler includes internal pipes which communicate with the exhaust manifold of an engine; a communication member to connect the internal pipes to each other; and an external plate which forms an air gap around the outer surfaces of both the internal pipes and the communication member. The communication member includes first and second Y-plates, which have respective partition walls and are placed in upper and lower positions and are assembled with each other. The first and second Y-plates are mounted at front ends thereof to the internal pipes and are combined together at the rear parts thereof. The air gap, formed in the front muffler, retains the warmth of exhaust gases and reduces the time required to activate the catalytic converter. The partition wall attenuates the operational noise of the engine and increases engine output.

Description

Premuffler

Technical field

The present invention relates to premuffler, relate more specifically to a kind of like this premuffler, it is between the gas exhaust manifold and catalytic converter of internal-combustion engine, and in interior pipe and Y shape plate (Y-Plate), form air gap to keep from the temperature of the waste gas of gas exhaust manifold discharge, thereby reduce the starting required time of catalytic converter, and this premuffler has the next door in Y shape plate, thereby weakens the operational noise in the motor and increase motor output.

Background technique

Silencer (venting gas appliance that is used for internal-combustion engine) is installed in the bottom of vehicle body usually, and the harmful components of the High Temperature High Pressure waste gas of will be during the internal combustion engine of vehicle discharging from gas exhaust manifold, for example HC, CO, NO _XDeng, change into innocuous gas by before this waste gas is drained into atmosphere, using catalyzer to carry out chemical reaction, for example CO ₂, H ₂O etc.

Waste gas from vehicle has been acknowledged as the important source of air-polluting, and is strictly being controlled in recent years, so vehicle must be equipped with venting gas appliance, and venting gas appliance has been carried out positive research.

Traditional silencer generally includes premuffler, catalytic converter, central silencer and main muffler.Waste gas from internal-combustion engine drains into premuffler by gas exhaust manifold, and passes through catalytic converter, central silencer and main muffler successively afterwards before draining into atmosphere.

Gas exhaust manifold is the expulsion element that so is provided with, that is, when blast in the cylinder of mixed gas at internal-combustion engine and as waste gas when cylinder is discharged, waste gas at first contacts gas exhaust manifold.Gas exhaust manifold is also as will be from the gas sampling of the cylinder trap at a place.

In order to use the gas exhaust manifold will be from the gas sampling of cylinder of internal-combustion engine at a place, the design factor below must considering.Specifically, in the four cylinder engine that carries out air-breathing, compression, blast, exhaust stroke, four cylinders are according to the order of first, the 3rd, the 4th and second cylinder stroke that explodes successively, so the 3rd cylinder combustion gas after the exhaust stroke of first cylinder, second cylinder is combustion gas after the exhaust stroke of four-cylinder.During the exhaust stroke of each cylinder, before the piston arrives lower dead center, open outlet valve.

Therefore, the exhaust stroke of the 3rd cylinder began before the exhaust stroke of first cylinder finishes fully, if thereby vent systems is designed to like this, even must be blended directly in together from the waste gas of first cylinder and the 3rd cylinder, so from the waste gas of the 3rd cylinder may outlet valve be temporarily opened during the suction stroke of first cylinder moment be back in first cylinder.In other words, although entering the backflow of cylinder, this waste gas do not take place, if but waste gas discharge simultaneously from two continuous cylinders, the outlet pipe relative narrower that becomes then, such phenomenon is called as " waste gas interference " (exhaust gas interference) in correlation technique.

Therefore, must be in turn with waste gas guiding outlet pipe from cylinder.In addition, gas exhaust manifold so designs, thus make from first and the waste gas of four-cylinder and waste gas from the 3rd and second cylinder be collected separately in separately the passage, and the waste gas of collecting first afterwards lumps together in the rear portion of premuffler secondary mixing.This two-stage waste gas hybrid mode is called as " 4-2-1 mode " in correlation technique.In addition, used a kind of " 4-1 mode ", wherein the waste gas from four cylinders was blended directly in together in a stage." 4-2-1 mode " is preferred for the vehicle with high-speed driving, and the vehicle that " 4-1 mode " is preferred under general condition driving.

, waste gas do not cause that waste gas interferes for being drained into atmosphere, it is desirable to that outlet pipe extends to external engine from each relief opening of respective cylinder.Yet, at corresponding relief opening outlet pipe is set all and does not conform to desirably with the increase of manufacture cost, the increase of weight and the reduction of practicability, thus unlikely suitable practical application.Although outlet pipe is arranged to extend from corresponding relief opening, if exist at interval but arrive fully at waste gas between time in precalculated position from the manifold of difference cylinder, the waste gas that flows out from long manifold does not meet with the waste gas that flows out from short manifold with regard to conforming to desirably so, thereby causes waste gas to be interfered.

Most important factor is in Design of Exhaust System, and manifold must be constructed with and can reduce the similar length that waste gas is interfered.Produce vent systems that waste gas interferes and in waste gas being forced drain into the process of atmosphere, do not conform to and desirably consumed engine power, thereby reduced motor output.

In addition, just the waste gas of discharging from cylinder by outlet valve has about 1000 ℃ temperature, cools off gradually during by vent systems at gas afterwards.Waste gas is to being heated by cooling liquid and oil-cooled relief opening (port around cylinder head engages with gas exhaust manifold in this place's cylinder head), thereby reduced the temperature of waste gas.In addition, when waste gas when premuffler is discharged, waste gas is loses heat owing to be subjected to the low temperature of premuffler of atmospheric air cooling.Therefore, reduced the temperature of waste gas.When exhaust gas temperature reduced, the volume of waste gas reduced.If the waste gas that temperature reduces keeps their initial volume, then the weight of waste gas is bound to increase.The waste gas that weight increases is difficult to circulation or motion.

When waste gas was cooled, activated catalyst increased with the required time of cleaning exhaust gas, therefore may produce excessive smog in the starting stage of engine start.

In addition, when the waste gas from two exhaust passages mixes, produce waste gas and interfere, thereby reduce motor output and in motor, produce operational noise.

Summary of the invention

Therefore, make the present invention in view of the problems referred to above that occur in the prior art, and the object of the present invention is to provide a kind of premuffler, be formed with air gap therein to keep from the temperature of the waste gas of gas exhaust manifold discharge, thereby reduce the starting required time of catalytic converter, and in this premuffler, be provided with the next door with the operational noise that weakens motor and increase motor output.

To achieve these goals, the invention provides a kind of premuffler with discharging waste gas, this premuffler comprises: pipe in a plurality of, and they are communicated with the gas exhaust manifold of internal-combustion engine; Connectedness, interior pipe communicates with each other by this connectedness; And outside plate, its outer surface around interior pipe and connectedness forms air gap, wherein connectedness comprises Y shape plate, in Y shape plate, be provided with the next door, this Y shape plate comprises a Y shape plate and the 2nd Y shape plate, they are positioned at the above and below, and assembling each other, and the first and second Y shape plates are installed at its front end and combined on inner pipe and at its rear portion; And the next door comprises along first next door of Y shape plate internal surface extension and second next door of extending along the 2nd Y shape plate internal surface.

Preferably, described first next door and second next door are spaced apart from each other with intended distance.

Preferably, in the rear portion in each next door, form septated hole.

The invention has the advantages that, premuffler is formed with air gap therein to keep from the temperature of the waste gas of gas exhaust manifold discharge, thereby reduce the starting required time of catalytic converter, and be provided with the next door therein with the operational noise that weakens motor and increase motor output.

In addition, the invention has the advantages that the next door up and down of premuffler is spaced apart from each other with intended distance, thereby increase engine torque and motor output with low speed or when driving at moderate speed at vehicle.

In addition, in the rear portion in each next door, be formed with septated hole, thereby waste gas is mixed gradually and prevent the fire damage in the next door that the rapid mixing by waste gas causes.

Description of drawings

Fig. 1 is the stereogram of schematically representing according to the premuffler of the embodiment of the invention;

Fig. 2 is the partial sectional view of schematically representing according to the premuffler of the embodiment of the invention;

Fig. 3 is the view of schematically representing according to the Y shape plate of the premuffler of the embodiment of the invention;

Fig. 4 is the sectional plain-view drawing of schematically representing according to the Y shape plate of the premuffler of the embodiment of the invention;

Fig. 5 is that the line A-A along Fig. 4 cuts open the sectional view of getting;

Fig. 6 is that the line B-B along Fig. 4 cuts open the sectional view of getting;

Fig. 7 is that expression is at the exhaust sound of premuffler of the present invention and the traditional premuffler chart as the function of engine speed;

Fig. 8 is that expression is at the engine torque of premuffler of the present invention and the traditional premuffler chart as the function of engine speed.

Embodiment

Hereinafter describe the preferred embodiments of the present invention with reference to the accompanying drawings in detail.

Fig. 1 is the stereogram of schematically representing according to the premuffler of the embodiment of the invention.Fig. 2 is the partial sectional view of schematically representing according to the premuffler of the embodiment of the invention.Fig. 3 is the view of schematically representing according to the Y shape plate of the premuffler of the embodiment of the invention.Fig. 4 is the sectional plain-view drawing of schematically representing according to the Y shape plate of the premuffler of the embodiment of the invention.Fig. 5 is that the line A-A along Fig. 4 cuts open the sectional view of getting.Fig. 6 is that the line B-B along Fig. 4 cuts open the sectional view of getting.Fig. 7 is that expression is at the exhaust sound of premuffler of the present invention and the traditional premuffler chart as the function of engine speed.Fig. 8 is that expression is at the engine torque of premuffler of the present invention and the traditional premuffler chart as the function of engine speed.

As depicted in figs. 1 and 2, be positioned at the front portion of silencer according to the premuffler of the embodiment of the invention, this silencer is the venting gas appliance that is used for internal-combustion engine.Premuffler of the present invention and is provided with an air gap in premuffler between the catalytic converter (not shown) of gas exhaust manifold (not shown) that waste gas is drained into atmosphere from motor and cleaning exhaust gas.Pipe 22, Y shape plate 23, outside plate 20, bellows 30 and back pipe 40 in premuffler comprises as connectedness.

Interior pipe 22 comprises two pipes that limit exhaust outlets.Pipe 22 front end is communicated with gas exhaust manifold by forward flange 10 in two, thereby the qualification exhaust outlet drains into atmosphere from the waste gas of motor by this exhaust outlet.

Y shape plate 23 is configured to like this, and promptly the front portion of plate 23 is divided into two passages by the next door, and these two passages combine at the rear portion of plate 23.In two passages in the front portion that is defined in plate 23, pipe 22 assemblings and being welded on the plate 23 in two, and combine at the rear portion of plate 23.Y shape plate 23 comprises a Y shape plate 23a and the 2nd Y shape plate 23b, and a Y shape plate 23a is the upper plate that is welded on the first next door 24a, and the 2nd Y shape plate 23b is the lower plate that is welded on the second next door 24b.The one Y shape plate 23a and the 2nd Y shape plate 23b are arranged in upper position and lower position, and the assembling each other by assembly process before welding together.

Outside plate 20 comprises the upper and lower, and they utilize wire mattress (steel wire mat) 21 to be welded on the outer surface of interior pipe 22 and Y shape plate 23, thereby form air gap at the external surface peripheral of interior pipe 22 and Y shape plate 23.Wire mattress 21 has reticular structure, and it is the reticular structure that is woven together thick and fast and makes by with wire, thereby reliable air gap is provided.In a preferred embodiment of the invention, wire mattress 21 is around the junction point setting between anterior and the interior pipe 22 and the Y shape plate 23 of each interior pipe 22.It should be understood, however, that under the situation that does not influence function of the present invention, a plurality of wire mattresses can be set in a plurality of positions to limit air gap.

Bellows 30 comprises the cylindricality corrugated conduit, and is woven with steel wire on the outer surface of corrugated conduit, at each place, end of corrugated conduit lid is installed.Bellows 30 is installed on the rear end of Y shape plate 23 by welding process.Bellows 30 can weaken exhaust vibration and the operating noise that produces from engine exhaust system, and can weaken the vibration that is caused by uneven road surface when vehicle on the way travels, thereby makes the passenger feel actual life comfortable and the increase vent systems.Therefore, bellows 30 can reduce the vibration and the impact that may act on the silencer.

Back pipe 40 is assemblied in the rear end of bellows 30 and is welded in this place, and combustion gas backward.On the sidewall of back pipe 40, be provided with the support hanger 41 that is used for hanging and supporting the vehicle body premuffler, simultaneously rear flange 50 be welded on the rear end of back pipe 40.Two studs 51 that rear flange 50 and catalytic converter (not shown) are assembled together are located on the position radially relative in the rear flange 50.

As shown in Figure 3 and Figure 4, Y shape plate 23 comprises a Y shape plate 23a, and the first next door 24a is welded on the internal surface of a Y shape plate 23a to limit the last next door of downward extension.Y shape plate 23 also comprises the 2nd Y shape plate 23b, and the second next door 24b is welded on the internal surface of the 2nd Y shape plate 23b to limit upwardly extending next door down.Therefore, waste gas from pipe 22 in two can slowly mix by two

next door

24a and 24b, rather than in Y shape plate 23, mix or produce the waste gas interference rapidly, therefore can prevent to interfere the reduction of the engine output that causes by waste gas.

Thereby, in the rear portion of corresponding

next door

24a and 24b, be preferably formed with a plurality of first septated hole 25a and a plurality of second septated hole 25b that all has preliminary dimension in order waste gas to be mixed lentamente prevent

next door

24a and 24b owing to the rapid mixing of waste gas is subjected to fire damage.

In addition, mix lentamente along the first next door 24a and the second next door 24b in order to make waste gas, two

next door

24a and 24b preferably are separated from each other with predetermined fixed intervals.If the interval between two next door 24a and the 24b is narrower than 1mm, may be reduced in so vehicle low/increase the operating effect of engine torque and motor output during driving at moderate speed.If 3mm is wider than at the interval between two next door 24a and the 24b, so vehicle low/may realize increasing the operating effect of engine torque and motor output during driving at moderate speed hardly.Therefore, the interval between two next door 24a and the 24b is preferably set to 1～3mm.

Describe the method for making outside plate 20 and Y shape plate 23 hereinafter with reference to Fig. 5 and Fig. 6, Fig. 5 and Fig. 6 are respectively along the line A-A of Fig. 4 and the sectional view of line B-B.

In order to make the Y shape plate 23 according to present embodiment, along the center line welding longitudinal blade shape next door 24a of the internal surface of a Y shape plate 23a, next door 24a has a plurality of first septated hole 25a at its rear portion.Similarly, along the center line welding longitudinal blade shape second next door 24b of the internal surface of the 2nd Y shape plate 23b, next door 24b has a plurality of second septated hole 25b at its rear portion.

In addition, the first next door 24a is in a predetermined direction along its curved edge, and therefore when the first next door 24a was welded on the Y shape plate 23a, the first next door 24a provided the contact surface that contacts with a Y shape plate 23a.The second next door 24b has the identical shape of above-mentioned shape with the first next door 24a.

All have the Y shape plate 23a in next door and the 2nd Y shape plate 23b be arranged to be perpendicular to one another in the face of and weld together to form single Y shape plate 23.Afterwards, pipe 22 in two is assemblied in the front end of Y shape plate 23, and by welding process and Y shape plate 23 formation one.Therefore, the waste gas that pipe 22 flows out in two are by Y shape plate 23 and slowly mix and can not produce waste gas and interfere.

In the present invention, welding process is preferably undertaken by any welding method, for example uses mig welding (MIG welding) method of welding rod.

In order to form, will be welded on as the wire mattress 21 of reinforcing material on the internal surface of upper and lower of outside plate 20 around the interior pipe 22 that welds together and the air gap of Y shape plate 23.Afterwards, the upper and lower of outside plate 20 is assembled each other with pipe 22 and Y shape plate 23 in surrounding.In addition, the front end of outside plate 20 is assembled together by cooperating with forward flange 10, and the rear end of outside plate 20 is assembled together by cooperating with bellows 30 simultaneously.Afterwards, the engage place between forward flange 10, outside plate 20 and bellows 30 carries out welding process, thereby forms the vitals of premuffler.After the vitals that forms premuffler, back pipe 40 and rear flange 50 are installed on this vitals, thereby form premuffler.In the present invention, wire mattress 21 preferred by spot-welded on for example on outside plate 20.

Fig. 7 is the expression exhaust sound as the chart of function of engine speed that has the premuffler in next door and do not have another premuffler in next door according to the present invention.When the exhaust sound of the premuffler that will have the next door is compared with the exhaust sound of another premuffler that does not have the next door, notice when high vehicle speeds, at premuffler with there is not to exist hardly between the premuffler in next door a difference on the exhaust sound with next door.Yet, when vehicle with in/during low speed driving, the premuffler with next door is compared with the premuffler that does not have the next door, has reduced the exhaust sound of about 1～3dB, and has reduced pneumatic noise.

Fig. 8 is the expression engine torque as the chart of function of engine speed that has the premuffler in next door and do not have another premuffler in next door according to the present invention.When the engine torque of the premuffler that will have the next door is compared with the engine torque of another premuffler that does not have the next door, notice when high vehicle speeds, at premuffler with there is not to exist hardly between the premuffler in next door a difference on the engine torque with next door.Yet, when vehicle with in/during low speed driving, the premuffler with next door is compared with the premuffler that does not have the next door, has increased by about 2%～6% engine torque, thereby has increased motor output.

Be used for explanation although disclose the preferred embodiments of the present invention, but those of skill in the art are understandable that, under the situation that does not break away from the disclosed scope and spirit of the present invention of claims, can carry out various modifications, replenish and substitute.

Claims

1. premuffler that is used for discharging waste gas, this premuffler comprises: pipe in a plurality of, they are communicated with the gas exhaust manifold of internal-combustion engine; Connectedness, described interior pipe communicates with each other by this connectedness; And outside plate, it forms around the air gap of the outer surface of described interior pipe and connectedness, wherein

Described connectedness comprises Y shape plate, is provided with the next door in this Y shape plate,

This Y shape plate comprises a Y shape plate and the 2nd Y shape plate, and they are positioned at the above and below, and assembling each other, and the described first and second Y shape plates are installed at its front end and combined on inner pipe and at its rear portion; And

Described next door comprises along first next door of described Y shape plate internal surface extension and second next door of extending along described the 2nd Y shape plate internal surface.

2. premuffler according to claim 1 is characterized in that, described first next door and second next door are spaced apart from each other with intended distance.

3. premuffler according to claim 1 and 2 is characterized in that, is formed with septated hole in the rear portion in each next door.