CN1589366A

CN1589366A - Exhaust system and a method of producing the same

Info

Publication number: CN1589366A
Application number: CNA028231023A
Authority: CN
Inventors: H·R·汉森
Original assignee: Norsk Hydro ASA
Current assignee: Norsk Hydro ASA
Priority date: 2001-11-20
Filing date: 2002-10-14
Publication date: 2005-03-02
Also published as: EP1451455B1; EP1451455A1; EA200400694A1; US20050067217A1; DE60209253D1; BR0214300A; AU2002350556A1; DE60209253T2; JP2005509792A; KR20050036900A; EA005845B1; ES2258658T3; WO2003044345A1; ATE317943T1

Abstract

Exhaust system to be used in combination with a combustion engine comprising an exhaust pipe and a silencer in which it consists of an outer casing (2) of a mainly uniform cross-section and an internal system comprising a number of chambers (4) and passages (6), acting as noise reduction for the combustion engine.

Description

Vent systems and production method thereof

The present invention relates to vent systems a kind of and the common use of internal-combustion engine, it comprises outlet pipe and silencing apparatus.

This vent systems is known generally.

By such automobile of internal-combustion engine energy supply, be equipped with a kind of vent systems so that reduce the noise that motor sent.This known vent systems comprises one or more big jar or chamber as silencing apparatus by the pipe interconnection.They are positioned over below the automobile usually and occupy sizable space.In modern designs, optimize the space use condition so that maximally utilise free space, strive to find the solution that consumes less space.Equally, the size and shape of known exhaust systems has negative effect for the aerodynamic quality of automobile.This is another importance, because must optimize aerodynamic quality so that reduce fuel consumption as far as possible, pollutes thereby also reduce as much as possible.Another negative factor of known exhaust systems is, owing to use steel in design, so weight is very high usually.Steel anti-corrosion capacity at high temperature is extremely low, and this causes increasing jar the wall thickness with pipe, so that increase the service life (till corrosion penetrates wall thickness).The increase of wall thickness causes weight to increase, and this also causes the increase of fuel consumption.In order to slow down corrosion, usually a kind of aluminium paint is coated on the steel exhaust systems, this plays partial action at least, but is difficult to recycling owing to raw material mixes thereby makes with the vent systems of crossing.Equally, also proposed to make vent systems, but made that their costs are higher, and caused and be difficult to production owing to stainless steel will be difficult to carry out machining and brazing than standard steel because material price is high by stainless steel.

An object of the present invention is to provide a kind of vent systems of aerodynamic quality improvement.Another purpose provides a kind of vent systems that consumes less space.Another purpose provides a kind of vent systems of weight saving.Another purpose provides the vent systems that increase a kind of working life.

According to the present invention, these purposes can realize by a kind of vent systems, this vent systems comprise a cross section roughly the shell and of homogeneous comprise the many chambers of the noise that is used to reduce internal-combustion engine and the built-in system of passage.Have the cross section roughly the vent systems of the shell of homogeneous compare not size offset and a large amount of sharp edges with the system of known type, and strengthened aerodynamic quality greatly.The cross section roughly shell of homogeneous allows that with the built-in system that comprises many chambers and passage Design of Exhaust System consumes less space and weight saving.Vent systems can by light-weight metal for example aluminium make, so can increase to any seclected time in working life, and reduce gross weight simultaneously.

The invention still further relates to a kind of method that is used to produce above-mentioned vent systems.

The method of this production vent systems comprises at least one shell of extruding, and provides an internal wall system so that be formed for reducing the chamber and the passage of internal combustion engine noise.

Like this, just can be with the low-cost production vent systems, because the more complicated design in shell cross section can be carried out significantly not increasing under the condition of cost.This is owing to use extruding method to produce on some degree.

This method can comprise extrusion process to the small part chamber, thereby can have the advantage identical with shell.

This method can comprise carries out plastic deformation so that be formed up to the chamber of small part, is used to optimize the suitable design considerations that reduces the noise that sends so that they are provided with.

This method can comprise the formation passage, thereby can form accurate and/or the little and big passage of arbitrary shape or form.

This method can comprise inserts stop block so that provide more designs free.

This method can comprise that forming one enters the mouth and/or an outlet, thereby makes them to be integrated in the design.In addition, they can connect subsequently, are for example undertaken by welding.

Hereinafter, present invention is described with reference to the accompanying drawings, and these accompanying drawings show the example of some embodiment of the invention.

Fig. 1 shows a kind of embodiment in cross section of profiled member of vent systems;

Fig. 2 shows another embodiment in cross section of a kind of profiled member of vent systems;

Fig. 3 shows another embodiment in cross section of a kind of profiled member of vent systems;

Fig. 4 shows another embodiment in cross section of a kind of profiled member of vent systems;

Fig. 5 shows the cross section A-A according to the profiled member of Fig. 4;

Fig. 6 shows a kind of end elevation of vent systems;

Fig. 7 shows the section B-B according to Fig. 6;

Fig. 8 shows the section B-B according to Fig. 6, and wherein arrow indication is gas stream by vent systems;

Fig. 9 shows a kind of cross section of another profiled member of vent systems;

Figure 10 shows the schematic representation of use according to the vent systems of the profiled member of Fig. 9; And

Figure 11 shows a kind of vent systems of completion, and it can be assemblied on the vehicle.

Shell 2 shown in Fig. 1 comprises one first profiled member and is positioned at another profiled member of its inside that this another profiled member comprises many walls 3.The shape of shell 2 has good aerodynamic quality.The wall 3 of interior profiled member is suitable for the inside boundary in further processing back formation vent systems.

Fig. 2,3 and 4 shows the different designs scheme of shell 2, and it comprises that inwall 3 forms as single extruding.

Fig. 5 shows the cross section A-A of the Fig. 4 that has shell 2 and inwall 3.

Fig. 6 shows a kind of vent systems that comprises the profiled member of Figure 4 and 5.Vent systems comprises a shell 2 and inwall 3.Wall 3 ' is in the plastic deformation of side process, and passage 6 is through for example process punching of machining, boring or the like.At opposite side, shell 2 ' and inwall 3 " enter the mouth 14 through plastic deformation so that form one.Equally also be formed with passage 6 and chamber 4, in Fig. 7, seen more clearly.

Fig. 7 shows the section B-B of Fig. 6 basically.Yet, increased stop block or baffle plate 12 for use in closed end and be used to separate each chamber 4.Shell 2 is out of shape so that form inlet 14 and export 16 in place, end process with wall 3.Also formed more chamber 4, for example by using axle to form.Passage 6 is located to form so that realize gas flow between each chamber 4 in position.Passage 6 can be virtually any size, shape and form.Size, shape and the form of each chamber 4 and passage 6 are design parameter, and the corresponding known technology formula of the flow of their uses and gas, speed, the reduction of required noise or the like calculates, and it is known by those skilled in the art.

Fig. 8 is identical with Fig. 7 basically.Just increased to be used to refer to and 14 passed the arrow that passage 6 flows into the air-flow of next chamber 4 or the like through a chamber 4 by entering the mouth.

According to the present invention, Design of Exhaust System can be taked different shape, size and form, decides on automobile kind, its purposes, motor kind or the like.

As fruit instant, inlet 14 and export 16 and can be equipped with and be convenient to the pipe that is connected with other parts.Especially, outlet 16 can be equipped with a pipe that is designed for the ratio noise that holds motor.Inlet 14 can be directly connected in firing chamber, manifold or for example on catalyst unit and/or the granule filter.

Fig. 9 shows another pipe 20 that is used as according to a kind of basic forming spare of vent systems of the present invention.Actual cross-section to this profiled member there is no strict demand, as long as it is adapted to be mounted to the following of automobile.Given this, it has a flat section 21 and curved section 22,23.Joint between

curved section

22,23 is provided with a semi-circular portions 24, and it substantially exceeds 180 ℃ of extensions, and the pipe that therefore has circular cross-section and suitable diameter can be installed on this part 24.

In order to make vent systems as shown in Figure 10, will be except open circular portion 24, the corresponding baffle plate 25 in the cross section of the pipe 20 among cross section and Fig. 9 is by end insertion and place predetermined distance place apart from this end.This can be according to carrying out with the corresponding method of method that baffle plate is placed manifold, and is for example disclosed among patent EP-A-0 891 528 or the EP-A-0 214 670.Like this, pipe 20 is divided into many spaces by baffle plate, and by semi-circular portions 24 interconnection.The volume in these spaces can adapt with the needs that vent systems plays the silencing apparatus effect.

A kind of improvement project that can make is, circular pipe end 26 is inserted semi-circular portions 24 and these pipe ends 26 are placed to two adjacent spaces making arbitrary end and baffle plate be in the same level or make each pipe end stretch into to be divided by baffle plate 25 in one of them.Like this can so that noise elimination function optimized.

Baffle plate 25 and pipe end 26 can be fixed in pipe 20 inside by the common employed welding method in related domain.

In Figure 11, show a kind of net shape of vent systems that can be constructed in accordance, it can directly apply to the bottom of automobile.Because the cross section of pipe is bigger, so exhaust line has enough intensity, has enough volumes simultaneously and is used to reduce noise.In view of a kind of needs in back, the extrusion modling part is carried out crooked this point for having sufficient length, thereby it is all very important to be used to reducing noise and to be installed on the automobile bottom to have enough volumes.In addition in view of other structural element for example live axle or the like be installed on automobile bottom, this bending operation is also very important.Silencing apparatus can use steel/alloyed steel to make, but it preferably uses light metal alloys such as titanium, aluminium, magnesium to make.It also can comprise the parts of being made by stupalith.Also can partially or completely use the plastics that have or do not have reinforcing material.Randomly, have an inner cover that is used to strengthen heat resistance.

Claims

1. An exhaust system for common use with an internal combustion engine, comprising an exhaust pipe and a muffler, characterized in that it comprises a housing (2) with a substantially uniform cross-section and a plurality of chambers (4) for reducing the noise of the internal combustion engine Internal system with channel (6).

2. An exhaust system according to claim 1, characterized in that it comprises a plurality of individual elements, including an extruded tube element provided with an inner wall which tends to form the chamber.

3. An exhaust system according to claim 2, characterized in that after extrusion the inner walls are partly removed, partly perforated and/or partly deformed in order to form chambers and channels.

4. An exhaust system according to claim 2 or 3, characterized in that at least one baffle is mounted in the housing to form a chamber.

5. The exhaust system according to any one of claims 1-4, characterized in that the housing is a multi-port extruded pipe element.

6. An exhaust system according to any one of claims 1-4, characterized in that the casing is provided with at least one baffle forming two adjacent chambers, and that the tubular hollow element forms a passage between the adjacent chambers , said tubular element extends into at least one of said chambers.

7. An exhaust system according to any one of the preceding claims, characterized in that it consists essentially of aluminum or an aluminum alloy.

8. An exhaust system according to any one of claims 1-7, characterized in that the housing (2) comprises at least two sections of correct shape and interconnected.

9. A method for producing an exhaust system according to any one of the preceding claims 1-8, characterized in that the method comprises extruding at least one casing and providing an inner wall system to form a Noisy rooms and passages.

10. A method according to claim 9, characterized in that the multi-port tube is extruded such that the inner walls are partly removed, partly perforated and/or partly deformed to form chambers and channels.

11. The method of claim 10, wherein at least one baffle is mounted in the housing.

12. A method according to any one of claims 9-11, characterized in that the housing is shaped to fit on a vehicle chassis.