CN2623885Y

CN2623885Y - Exhaust manifold structure for multicylinder internal combustion engine

Info

Publication number: CN2623885Y
Application number: CN 03233090
Authority: CN
Inventors: 朱絮飞; 刘伦; 张劲松
Original assignee: Changan Automobile Group Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2003-01-28
Filing date: 2003-01-28
Publication date: 2004-07-07
Anticipated expiration: 2013-01-28

Abstract

The utility model relates to an exhaust manifold structure. The exhaust manifold extending out from a cylinder head of an engine is characterized in that the exhaust manifold is designed as equilong, symmetrical stainless steel separately, and positioned in a spherical cap shaped intake vertex separately, while an oxygen sensor is arranged on the curve surface of the intake vertex. The intake vertex can be welded with the stainless steel encapsulating barrel of the TWC. The advantages of the utility model is that equilong, symmetrical stainless steel pipe is adopted as exhaust manifold thus the exhaust manifold design principles are satisfied, the design freedom of motion is so much high, and the design process can be simplified. The trail-manufacture and the sample cost a shorter time. A plurality of design proposals can be tested at the same time thus the design proposals can be optimized; the arrangement of the installation site of the oxygen sensor is much freer and flexible than the arrangement of the prior casting exhaust manifold.

Description

The gas exhaust manifold structure of internal-combustion engine with multi-cylinders

Technical field

The utility model belongs to technical field of internal combustion engines, is specifically related to a kind of gas exhaust manifold structure of internal-combustion engine with multi-cylinders.

Technical background

Bulk limits existing multi-cylinder engine gas exhaust manifold and the contradiction of casting mould die sinking direction in order to be in harmonious proportion in design process, is difficult to design and satisfies the gas exhaust manifold design principle, as isometric, symmetrical gas exhaust manifold; The material of casting gas exhaust manifold is grey cast iron or spheroidal graphite cast iron, and wall thickness is at 3.5-4.5mm, Heavy Weight; And under the present national situation strict day by day to emission request, the position of lambda sensor is very important, must guarantee the degree of accuracy of image data.Existing multi-cylinder engine gas exhaust manifold as seen from Figure 1, in order to guarantee to install, gas exhaust manifold has to be designed to not isometric structural type.Like this, the conformity of each cylinder of exhaust back pressure can not get good assurance, influences the performance and the data capture of motor; And in order to adapt to casting mould die sinking direction, the position of lambda sensor has been subjected to certain restriction.

Summary of the invention

The purpose of this utility model is at the prior art above shortcomings, a kind of gas exhaust manifold structure of multi-cylinder engine of new structure is provided, not only satisfy the isometric or symmetry principle of gas exhaust manifold design but also can freedom and flexibility ground be installed by lambda sensor, solved the problem of the existence of prior art.

The technical solution adopted in the utility model is as follows:

The gas exhaust manifold structure of internal-combustion engine with multi-cylinders, gas exhaust manifold is picked out by the cylinder head of internal-combustion engine respectively, be characterized in that the gas exhaust manifold that will pick out is designed to independently isometric, symmetrical separately Stainless Steel Tube, tap into domed taking in the zenith respectively, lambda sensor is arranged in to be taken on the zenith curved surface.

The described stainless steel encapsulation cylinder of taking in zenith and ternary catalyzing unit welds together.

The advantage of said structure is conspicuous: adopting isometric, symmetrical Stainless Steel Tube is that gas exhaust manifold satisfies the gas exhaust manifold design principle, because Stainless Steel Tube is in the space moulding, just need not consider the restriction of casting mould die sinking direction, each cylinder tracheae of design gas exhaust manifold under spatiality, design freedom is high, design process is simplified, and the layout of lambda sensor mounting point is also than casting gas exhaust manifold freedom in the past, flexible simultaneously; Simultaneously, in the development and Design of gas exhaust manifold, the stainless steel space bends short, exemplar production time weak point of the gas exhaust manifold trial-production time of moulding, can make a plurality of design proposals simultaneously and participate in test, helps optimizing design scheme; In addition, the variation of the caliber of each air flue is easy to satisfy size requirement by expander, reaches the identical effect of casting gas exhaust manifold.

Description of drawings

Fig. 1 is the gas exhaust manifold structural drawing of existing internal-combustion engine with multi-cylinders;

Fig. 2 is the gas exhaust manifold structural drawing of internal-combustion engine with multi-cylinders of the present utility model;

Fig. 3 is the side view of Fig. 2.

Embodiment

Referring to Fig. 2 and Fig. 3, the gas exhaust manifold 1 of the gas exhaust manifold structure of internal-combustion engine with multi-cylinders is picked out by the cylinder head 2 of internal-combustion engine respectively, gas exhaust manifold 1 is independently isometric, symmetrical Stainless Steel Tube separately, tap into domed taking in the zenith 5 respectively, this stainless steel encapsulation cylinder of taking in zenith 5 and ternary catalyzing unit 4 welds together, and lambda sensor 3 is arranged in to be taken on zenith 5 curved surfaces.

In this structure, take under the zenith and also can weld and the exhaust turbine supercharger mounting flange.

Claims

1, the gas exhaust manifold structure of internal-combustion engine with multi-cylinders, gas exhaust manifold is picked out by the cylinder head of internal-combustion engine respectively, it is characterized in that the gas exhaust manifold that picks out is independently isometric, symmetrical Stainless Steel Tube separately, tap into domed taking in the zenith respectively, lambda sensor is arranged in to be taken on the zenith curved surface.

2, the gas exhaust manifold structure of internal-combustion engine with multi-cylinders according to claim 1 is characterized in that the described stainless steel encapsulation cylinder of taking in zenith and ternary catalyzing unit welds together.