CN103032145A

CN103032145A - Vehicle exhaust system

Info

Publication number: CN103032145A
Application number: CN2011102986083A
Authority: CN
Inventors: 李博; 马建军; 刘湃
Original assignee: Pan Asia Technical Automotive Center Co Ltd; Shanghai General Motors Co Ltd
Current assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Priority date: 2011-09-30
Filing date: 2011-09-30
Publication date: 2013-04-10
Anticipated expiration: 2031-09-30
Also published as: CN103032145B

Abstract

The invention relates to a vehicle exhaust system which comprises a bracket, exhaust pipes, a flange, a thermal shroud, a lifting hook, a middle silencer, a rear silencer and a tail pipe, wherein the bracket, the exhaust pipes, the flange, the thermal shroud, the lifting hook, the middle silencer, the rear silencer and the tail pipe are all made of B409M materials. The vehicle exhaust system manufactured by the B409M material is stable in performance, high in erosion resistance and low in price, and solves the problems that the materials used in the prior art are bad in erosion resistance or high in price.

Description

A kind of automobile exhaust system

Technical field

The present invention relates to a kind of automobile exhaust system.

Background technique

Automobile exhaust system is positioned at vehicle bottom, and connecting engine outlet side and atmosphere, Main Function are waste gas, purifying exhaust air, the reduction noises that the discharging motor produces.Its structure mainly is comprised of ternary catalyzing unit, pipe, rubber hanger, baffler etc.

The automobile exhaust system work under bad environment comprises the excitation vibrations, high temperature, corrosion on motor and road surface etc.Especially for the vent systems cold junction, corrosion becomes maximum after sale complaint problem.Some gasoline quality is relatively poor in addition, and sulphur content is high, has further aggravated exhaust system corrosion.Therefore, in order to tackle the abominable working environment of vent systems, necessary usability is stable, the stainless steel raw material of excellent corrosion resistance.

At present to use more be the materials such as 409,439,436 to vent systems, and wherein 409 materials are relatively poor with respect to 439,436 decay resistances, but 439,436 cost of material are relatively high.

Summary of the invention

The invention provides a kind of automobile exhaust system, purpose provides the automobile exhaust system of being made by a kind of stable performance, the high and low-cost stainless steel material of corrosion resistance, makes the material of automobile exhaust system or the problem of price height or corrosion-resistant in order to solve prior art.

In order to achieve the above object, described vent systems comprises support, outlet pipe, flange, thermal shield, suspension hook, middle baffler, after silencer and tail pipe, and their material is the B409M material;

Described B409M material is stainless steel cold-rolled plate, its chemical composition is as follows: C≤0.02wt%, Mn≤1.00wt%, Si≤1.00wt%, P≤0.04wt%, S≤0.03wt%, Cr are 11.00-12.5wt%, Ni≤0.50wt%, N≤0.02wt%, Ti+Nb＞0.08+8x (C+N), Ti are 0.12-0.50wt%, Nb 〉=0.12wt%; Yield strength is 170-290MPa, and tensile strength 〉=380MPa according to the elongation percentage of ISO 6892type 1 〉=28%, according to the grain size of ASTM E112 〉=5 grades, and does not contain banded structure.

As preferred embodiment, in described system foremost, described support is connected with one section outlet pipe by flange; Thermal shield is wrapped in the outside of one section outlet pipe front portion, and hook is positioned at the rear portion of this section outlet pipe, and this section outlet pipe is connected with another section outlet pipe by flange; The rear portion of described another section outlet pipe is connected with middle baffler, the other end of described middle baffler is connected with one section outlet pipe again, this section outlet pipe is by on the outlet pipe that flange is connected to after silencer links to each other, the front-end and back-end of described after silencer are connected with respectively hook, also are connected with tail pipe in the rear end of described after silencer;

As preferred embodiment, described middle baffler comprises housing, internal baffle, front cover, hole pipe and rear end cover, and their material is the B409M material;

As preferred embodiment, described front cover and rear end cover lay respectively at the front-end and back-end of middle baffler; Intermediate radial at middle baffler is placed with porose annular internal baffle, and the size of this internal baffle cooperates with the interior size of middle baffler; Be respectively equipped with the hole at front cover, rear end cover and internal baffle, the hole pipe axially runs through front cover, rear end cover and internal baffle by described hole;

The logical via barrel of described middle baffler is connected with the outlet pipe at two ends respectively, and described suspension hook is connected with respectively on front cover and the rear end cover.

As preferred embodiment, described after silencer comprises front cover, internal baffle, housing, internal baffle, suction tude, rear end cover and steam outlet pipe, and their material is the B409M material;

As preferred embodiment, described front cover and rear end cover lay respectively at the front-end and back-end of after silencer, and respectively up with the below with a hole; The size of this internal baffle cooperates with the interior size of described after silencer with porose internal baffle to placing two in the midfeather leading thread of after silencer, and distinguishes respectively with a hole with the below up; Suction tude by the hole on the front cover with are connected the hole of internal baffle top and are connected with this three, steam outlet pipe is connected with this three with a hole of being connected below the internal baffle by the hole on the rear end cover; The part band of position of described suction tude and steam outlet pipe is porose;

Described after silencer is connected with outlet pipe by suction tude, is connected with tail pipe by steam outlet pipe, and described suspension hook is connected on front cover and the rear end cover.

Can find out from above-mentioned technological scheme, the material of automobile exhaust system of the present invention is the B409M material, because this is with the B409M material property is stable, corrosion resistance is high and low price, solved in the prior art material or corrosion-resistant or the high problem of price of automobile exhaust system used, therefore improve the decay resistance of automobile exhaust system, reduced simultaneously the cost of part.

Description of drawings

Fig. 1 is the schematic representation of automobile exhaust system;

Fig. 2 a is the schematic perspective view of middle baffler;

Fig. 2 b is the plan view of middle baffler;

Fig. 3 is the schematic representation of internal baffle in the middle baffler;

Fig. 4 a is the schematic perspective view of after silencer;

Fig. 4 b is the plan view of after silencer;

Fig. 5 is the schematic representation of internal baffle in the after silencer;

Fig. 6 is surperficial enlarged view and the grain size number certificate of B409M material.

Embodiment

Referring to accompanying drawing, the specific embodiment that develops simultaneously is described in detail automobile exhaust system of the present invention.

The automobile exhaust system of the embodiment of the invention comprises support 1, outlet pipe 2, flange 3, thermal shield 4, suspension hook 5, flange 6, outlet pipe 7, outlet pipe 8, middle baffler 9, outlet pipe 10, flange 11, outlet pipe 12, after silencer 13, suspension hook 14, suspension hook 15 and tail pipe 16 among Fig. 1, and the material of these constituent elements is the B409M material.

As shown in Figure 1, support 1 is connected with outlet pipe 2 by flange 3, thermal shield 4 is wrapped in the outside of outlet pipe 7 front portions, at outlet pipe 7 rear portions suspension hook 5 is housed, outlet pipe 7 is connected with outlet pipe 8 by flange 6, one end of middle baffler 9 is connected with outlet pipe 8, the other end is connected with outlet pipe 10, outlet pipe 10 is connected with outlet pipe 12 by flange 11, one end of after silencer 13 is connected on the outlet pipe 12, the other end is connected with tail pipe 16, is connected with respectively suspension hook 14 and suspension hook 15 in the front-end and back-end of after silencer 13.

Middle baffler 9 shown in Fig. 2 a-b comprises housing 91, internal baffle 92, front cover 93, hole pipe 94 and rear end cover 95, and their material also is the B409M material.

Front cover 93 and rear end cover 95 lay respectively at the front-end and back-end of middle baffler 9; Intermediate radial at middle baffler 9 is placed with porose annular internal baffle 92 (as shown in Figure 3), and the size of internal baffle 92 cooperates with the interior size of middle baffler 9; Be respectively equipped with the hole at front cover 93, rear end cover 95 and internal baffle 92, hole pipe 94 axially runs through front cover 93, rear end cover 95 and internal baffle 92 by described hole.

Wherein, an end of the close front cover 93 of conduit 94 is connected with outlet pipe 8, and an end of close rear end cover 95 is connected with outlet pipe 10.

After silencer 13 shown in Fig. 4 a-b comprises front cover 131, internal baffle 132, housing 133, suction tude 134, rear end cover 135, steam outlet pipe 136, and their material is the B409M material equally.

Front cover 131 and rear end cover 135 lay respectively at the front-end and back-end of after silencer 13, and respectively up with the below with a hole; The size of internal baffle 132 cooperates with the interior size of after silencer 13 with porose internal baffle 132 to placing two in the midfeather leading thread of after silencer 13, and distinguishes respectively with a hole with the below up; Suction tude 134 by the hole on the front cover 131 with are connected the hole of an internal baffle 132 tops and are connected with this three, steam outlet pipe 136 pass through on the rear end cover 135 the hole with are connected the hole of an internal baffle 132 belows and are connected with this three; The part band of position of suction tude 134 and steam outlet pipe 136 is porose.

Wherein, suction tude 134 is connected with outlet pipe 12, and steam outlet pipe 136 is connected with tail pipe 16; Suspension hook 14 is connected on the front cover 131, and suspension hook 15 is connected on the rear end cover 135.

This B409M material is stainless steel cold-rolled plate, its chemical composition is as follows: C≤0.02wt%, Mn≤1.00wt%, Si≤1.00wt%, P≤0.04wt%, S≤0.03wt%, Cr are 11.00-12.5wt%, Ni≤0.50wt%, N≤0.02wt%, Ti+Nb＞0.08+8x (C+N), Ti are 0.12-0.50wt%, Nb 〉=0.12wt%; Its yield strength is 170-290MPa, and tensile strength 〉=380MPa according to the elongation percentage 28% of ISO6892type1, is 5 grades or thinner according to the grain size of ASTM E112, does not contain banded structure.

Because B409M material carbon content, precious metal Cr that automobile exhaust system of the present invention uses, the Nb composition is different from other 409 stainless steel materials, and having good uniformity of its metallographic structure, as shown in Figure 6, grain size according to ASTM E112 is 5 grades or thinner, therefore compare with 409 materials of the prior art and have preferably decay resistance, and cost ratio 439 materials and 436 materials are low.

Can find out from top description, use the automobile exhaust system of the present invention of B409M material to have good decay resistance, reduce simultaneously the cost of part.

Claims

1. an automobile exhaust system comprises support, outlet pipe, flange, thermal shield, suspension hook, middle baffler, after silencer and tail pipe, it is characterized in that, the material of each part mentioned above is the B409M material in the described vent systems;

2. system according to claim 1 is characterized in that, in described system foremost, described support is connected with one section outlet pipe by flange; Thermal shield is wrapped in the outside of one section outlet pipe front portion, and hook is positioned at the rear portion of this section outlet pipe, and this section outlet pipe is connected with another section outlet pipe by flange; The rear portion of described another section outlet pipe is connected with middle baffler, the other end of described middle baffler is connected with one section outlet pipe again, this section outlet pipe is by on the outlet pipe that flange is connected to after silencer links to each other, the front-end and back-end of described after silencer are connected with respectively hook, also are connected with tail pipe in the rear end of described after silencer;

3. system according to claim 1 and 2 is characterized in that, described middle baffler comprises housing, internal baffle, front cover, hole pipe and rear end cover, and their material is the B409M material;

4. system according to claim 3 is characterized in that, described front cover and rear end cover lay respectively at the front-end and back-end of middle baffler; Intermediate radial at middle baffler is placed with porose annular internal baffle, and the size of this internal baffle cooperates with the interior size of middle baffler; Be respectively equipped with the hole at front cover, rear end cover and internal baffle, the hole pipe axially runs through front cover, rear end cover and internal baffle by described hole;

5. system according to claim 1 and 2 is characterized in that, described after silencer comprises front cover, internal baffle, housing, internal baffle, suction tude, rear end cover and steam outlet pipe, and their material is the B409M material;

6. system according to claim 5 is characterized in that, described front cover and rear end cover lay respectively at the front-end and back-end of after silencer, and respectively up with the below with a hole; The size of this internal baffle cooperates with the interior size of described after silencer with porose internal baffle to placing two in the midfeather leading thread of after silencer, and distinguishes respectively with a hole with the below up; Suction tude by the hole on the front cover with are connected the hole of internal baffle top and are connected with this three, steam outlet pipe is connected with this three with a hole of being connected below the internal baffle by the hole on the rear end cover; The part band of position of described suction tude and steam outlet pipe is porose;