CN103375240A

CN103375240A - Exhaust manifold assembly

Info

Publication number: CN103375240A
Application number: CN 201210104797
Authority: CN
Inventors: 贾友昌; 赵蕾; 杜潇; 叶坚
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2012-04-12
Filing date: 2012-04-12
Publication date: 2013-10-30

Abstract

The invention discloses an exhaust manifold assembly structure which is symmetrical and compact in structure. By the aid of the exhaust manifold assembly symmetrical in structure, tail gas entering a three-way catalyst is ensured to be even, and air pressure impulse interference is reduced. Sub-branch manifolds connecting with every cylinder cover exhaust port are preferably converged to form 'Y'-shaped branches, and the 'Y'-shaped branches are converged at the position of a main exhaust manifold of the exhaust manifold, so that the exhaust manifold assembly is ensured to be shorter and more compact in structure, stroke length of the exhaust manifold assembly is shortened, and high converting efficiency and good durability of the three-way catalyst can be guaranteed.

Description

Exhaust manifold assembly

Technical field

The invention belongs to technical field of engines, be specifically related to a kind of engine exhaust manifold assembly structure.

Background technique

At present, because the increasingly stringent of Abgasgesetz, motor vehicle exhaust emission more and more comes into one's own, the main three-element catalytic post-processing technology that adopts of motor vehicle exhaust emission control, for ternary catalyzing unit keeps high transformation efficiency and good durability, the general close coupled type gas exhaust manifold catalytic converter assembly that adopts, it is even to require simultaneously gas exhaust manifold to enter the air-flow of catalytic converter assembly, avoid adjacent acting cylinder in exhaust process, produce air-flow, pneumatic pressure pulses interference at gas exhaust manifold and ternary catalyzing unit joint.

The prior art gas exhaust manifold enters ternary catalyzing unit for fear of air-flow and produces interference in air flow, draw respectively independent symmetrical manifold gas-distributing channel at place, the cylinder cap air outlet of correspondence and converge in ternary catalyzing unit joint collective, thereby guarantee that the air-flow concourse has stable air pressure, make the interior air-flow of ternary catalytic converter assembly even, avoided oxygen sensor signal to receive the problems such as insensitive, that exhaust back pressure is high.

But because the independent symmetrical gas-distributing channel of each that converge in the ternary catalyzing unit joint will accomplish that each air flue internal gas flow converges mutually, need long air flue stroke to adjust air pressure in each air flue at concourse than air flow pressure reduction, so be unfavorable for the exhaust manifold structure compactedness, be difficult to arrange; Because it is long that tail gas enters the ternary catalyzing unit stroke, be unfavorable for that more ternary catalyzing unit keeps high transformation efficiency and good durability.

Summary of the invention

The present invention proposes the exhaust manifold assembly structure of a kind of symmetry and compact structure, the exhaust branch pipe of symplex structure has guaranteed to enter all even reduction pneumatic pressure pulses interference of tail gas of ternary catalyzing unit, simultaneously, the divided manifold that connects each cylinder cap relief opening preferentially merges into " Y " word branch in weakness, each " Y " structure again converged at the exhaust manifold place of gas exhaust manifold of word branch guaranteed that manifold has shorter and compact structure, thereby saved the manifold running length, guaranteed that ternary catalyzing unit can keep high transformation efficiency and good durability.

Exhaust manifold assembly disclosed by the invention, comprise exhaust air flue, the ternary catalyzing unit that is connected with the exhaust air flue, it is characterized in that: exhaust air flue one end is minute branch airway and is connected with the cylinder cap relief opening respectively, the contiguous branch air flue merges into " Y " word branch along airflow direction, the contiguous branch air flue that merges into " Y " word branch is corresponding to the interval cylinder that does work, each " Y " word branch meets at the total air flue of exhaust of the exhaust air flue the other end, and the total air flue of exhaust is connected with the ternary catalyzing unit entrance point.

Further, " Y " word branch is received in the total air flue direction of exhaust, centered by the total air flue axis of exhaust, and structure axisymmetricly;

Further, exhaust air flue one end is four minutes branch airway and is connected respectively with the cylinder cap relief opening of four cylinder engine, first minute branch airway and second minute branch airway merge into " Y " word branch along airflow direction, and the 3rd minute branch airway and the 4th minute branch airway merge into " Y " word branch along airflow direction; After cylinder acting exhaust corresponding to first minute branch airway, the cylinder acting exhaust that and then branch airway was corresponding in the 3rd minute; After the cylinder acting exhaust that branch airway was corresponding in the 4th minute, and then cylinder acting exhaust corresponding to branch airway in second minute;

Further, the middle position of the total air flue of exhaust that converges of each " Y " word branch arranges lambda sensor;

Further, the exhaust air flue is welded into by half housing of up and down two drawings;

Further, divide branch airway to be connected with the cylinder cap relief opening by flange plate.

Useful effect of the present invention is: the tail gas that the exhaust branch pipe of symplex structure has guaranteed to enter ternary catalyzing unit evenly, reduce the interference of pneumatic pressure pulses, simultaneously, the divided manifold that connects each cylinder cap relief opening preferentially merges into " Y " branch in weakness, each " Y " structure again converged at gas exhaust manifold house steward place of branch guaranteed that manifold keeps under the symmetrical form, can have shorter and compact structure, thereby guarantee that ternary catalyzing unit can keep high transformation efficiency and good durability.In addition, compact exhaust manifold structure has dwindled the entrucking space of outlet pipe, and the spatial structure that is conducive to car load arranges that the structure of repeatedly converging has also been saved gas exhaust manifold materials radical, realizes the engine component lightweight when saving cost.

Figure of description

Fig. 1 is structural representation of the present invention;

Fig. 2 is left view of the present invention.

Embodiment

As shown in Figure 1 and Figure 2, exhaust manifold assembly, comprise exhaust air flue 6, the ternary catalyzing unit 9 that is connected with exhaust air flue 6, exhaust air flue 6 one ends are minute branch airway and are connected with the cylinder cap relief opening respectively by flange plate 5, the contiguous branch air flue merges into " Y " word branch along airflow direction, merge into the contiguous branch air flue of " Y " word branch corresponding to non-adjacent acting cylinder, each " Y " word branch meets at the total air flue 10 of exhaust of exhaust air flue 6 the other ends, and the total air flue 10 of exhaust is connected with the entrance point 8 of ternary catalyzing unit 9.

In the cylinder after the piston acting exhaust, piston does work and exhaust in back to back second cylinder, follow piston acting exhaust in the 3rd cylinder, first and second cylinder body that and then does work are adjacent acting cylinder again, and first and the 3rd acting cylinder body claim interval acting cylinder body.

The middle position of the total air flue that converges in " Y " word branch arranges lambda sensor 7, has solved the inhomogeneous and oxygen sensor signal of air-flow and has received the sensitivity problem, has improved discharge control level;

Pneumatic pressure pulses interference problem in the time of can better avoiding air-flow input ternary catalyzing unit entrance point 8 for system synthesis, " Y " word branch is received in total air flue 10 directions of exhaust, centered by total air flue 10 axis of exhaust, structure axisymmetricly;

Each exhaust manifold air passage all adopts up and down, and two and half housing punch weldings form;

For four cylinder engine be, minute branch airway is corresponding to the interval cylinder that does work, the exhaust air flue comprises first minute branch airway 1, second minute branch airway 2, the 3rd minute branch airway 3 and the 4th minute branch airway 4, first minute branch airway 1 and second minute branch airway 2 merge into " Y " word branch along airflow direction, and the 3rd minute branch airway 3 and the 4th minute branch airway 4 merge into " Y " word branch along airflow direction; After the cylinder acting exhaust of first minute branch airway 1 correspondence, the and then cylinder acting exhaust of the 3rd minute branch airway 3 correspondences; After the cylinder acting exhaust of the 4th minute branch airway 2 correspondences, the and then cylinder body acting exhaust of second minute branch airway 4 correspondence.

Claims

1. exhaust manifold assembly, comprise exhaust air flue (6), the ternary catalyzing unit (9) that is connected with exhaust air flue (6), it is characterized in that: exhaust air flue (6) one ends are minute branch airway and are connected with the cylinder cap relief opening respectively, the contiguous branch air flue merges into " Y " word branch along airflow direction, the contiguous branch air flue that merges into " Y " word branch is corresponding to the interval cylinder that does work, each " Y " word branch meets at the total air flue of exhaust (10) of exhaust air flue (6) the other end, and the total air flue of exhaust (10) is connected with the entrance point (8) of ternary catalyzing unit (9).

2. exhaust manifold assembly as claimed in claim 1 is characterized in that: " Y " word branch is received in the total air flue of exhaust (10) direction, centered by the total air flue of exhaust (10) axis, and structure axisymmetricly.

3. exhaust manifold assembly as claimed in claim 1, it is characterized in that: exhaust air flue one end is four minutes branch airway and is connected respectively with the cylinder cap relief opening of four cylinder engine, first minute branch airway (1) with second minute branch airway (2) merge into " Y " word branch along airflow direction, the 3rd minute branch airway (3) with the 4th minute branch airway (4) merge into " Y " word branch along airflow direction; After the cylinder acting exhaust of first minute branch airway (1) correspondence, and then cylinder acting exhaust corresponding to the 3rd minute branch airway (3); After the cylinder acting exhaust of the 4th minute branch airway (4) correspondence, and then cylinder acting exhaust corresponding to second minute branch airway (2).

4. exhaust manifold assembly as claimed in claim 1 or 2 is characterized in that: the middle position of the total air flue of exhaust (10) that each " Y " word branch is converged arranges lambda sensor (7).

5. exhaust manifold assembly as claimed in claim 1 or 2 is characterized in that: exhaust air flue (6) is welded into by half housing of up and down two drawings.

6. exhaust manifold assembly as claimed in claim 1 or 2 is characterized in that: divide branch airway to be connected with the cylinder cap relief opening by flange plate (5).