Integrated-designed engine cylinder cover

Abstract

The invention provides an integrated-designed engine cylinder cover. The engine cylinder cover integrates an exhaust manifold, an EGR cooling device and a secondary air channel device simultaneously. The exhaust manifold is integrated on the exhaust side of the engine cylinder cover. A gas inlet of the EGR cooling device is integrated on the exhaust manifold. A gas outlet of the EGR cooling device is integrated on the gas inlet side of the engine cylinder cover. The secondary air channel device is integrated on the exhaust manifold. The engine cylinder cover is installed as a whole, too many exhaust manifolds, external type EGR cooling devices, external type secondary air channel devices and other parts do not to be installed, through the highly integrated engine cylinder cover, the number and weight of parts of the complete machine are reduced, oil consumption and discharge performance of an engine is also improved significantly, meanwhile, the design of the complete machine is more compact, and the cost of the complete machine has more advantages.

Description

technical field [0001] The patent of the present invention relates to the technical field of engine cylinder head, in particular to an integrated designed engine cylinder head, especially an integrated engine cylinder head integrated with an exhaust manifold, an EGR cooling device and a secondary air channel device. Background technique [0002] Integrated design is the main trend of modern engine design. All OEMs are improving engine indicators through integrated design. The main advantages of integrated design are: reducing the number of connectors and parts by simplifying structural design, reducing the overall At the same time, fewer parts greatly reduce the failure rate and maintenance cost of the whole machine, and improve the reliability of the whole machine. Engine cost reduction, weight reduction, fuel consumption reduction, and emission reduction have become the main directions of engine design. As one of the most complex core components of the engine, the cylinder...

AI Technical Summary

Problems solved by technology

The structural design has the following problems: the exhaust passage from the exhaust side of the combustion chamber to the exhaust manifold is long, and the cold start of the engine is not conducive to the rapid operation of the three-way catalytic converter; the number of exhaust hot-end parts on the exhaust side of the combustion chamber is large, There are problems with bolt fastening and gasket sealing at the connection; the space on the exhaust side of the combustion chamber is large, which is inconvenient for vehicle layout, etc. It is necessary to optimize the structure and design of the exhaust side of the combustion chamber of the engine cylinder head

[0004] In order to further reduce engine fuel consumption and emissions, EGR technology (Exhaust Gas Recirculation) is usually used in the prior art. The engine EGR technology needs to take air from the exhaust pipe of the engine and send it to the cylinder head after cooling. In the intake passage, due to the high exhaust temperature, it is necessary to use a special cooling device to cool the gas from the hot-end exhaust pipe. In the prior art, an EGR cooling device is usually connected externally to the EGR channel pipeline. This independent external EGR The solution of the cooling device has the following problems: the size and weight of the cooling device are large, and the cooling pipelines are many and complicated, which is not conducive to the layout of the engine, which is inconsistent with the lightweight design of the engine, and the cost of the cooling device is relatively high.

However, there are following defects in the existing setting method of this secondary air passage device: the secondary air passage is arranged near the flange surface of the junction of the exhaust manifold and the cylinder head. The flange surface is far away from the airway valve of the combustion chamber, which makes the temperature of the mixture of fresh air and oil and gas pressed in through the secondary air passage low when it reaches the combustion chamber, which is not conducive to the combustion of the mixture and seriously affects the exhaust emission effect

[0006] To sum up, in the design of the engine cylinder head in the prior art, the exhaust manifold, EGR cooling device and secondary air channel device are all independently designed, and connected to the cylinder head through relatively complicated pipelines. In actual use, there are Larger defect, there has not been a technology that integrates the exhaust manifold, EGR cooling device and secondary air channel device into the cylinder head of the engine at the same time in the prior art, that is to say, there has not been a technology in the prior art. An engine cylinder head integrated with exhaust manifold, EGR cooling device and secondary air passage device at the same time

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