Air inlet channel heat insulation structure on air cylinder cover

Abstract

The invention relates to an air inlet channel heat insulation structure on a cylinder cover, which comprises the cylinder cover and an air inlet manifold, a heat insulation component is arranged between the air inlet manifold and the cylinder cover, and the heat insulation component is fixedly connected with the cylinder cover and the air inlet manifold through a plurality of mounting bolts; the heat insulation component is composed of an installation face and a plurality of air channels vertically arranged on the installation face, and a plurality of bolt holes are further formed in the installation face. A plurality of upper air inlet channels are formed in the air cylinder cover, a heat insulation component matching part is arranged at the air inlet end of each upper air inlet channel, a step is arranged at the position, connected with the corresponding upper air inlet channel, of one end of each heat insulation component matching part, and the other end of each heat insulation component matching part is located on an air inlet flange face of the air cylinder cover. The multiple air channels in the heat insulation component are matched with the multiple heat insulation component matching parts of the air cylinder cover in a one-to-one correspondence mode, and gaps exist between the air channels and the heat insulation component matching parts. The cylinder cover can meet the requirements of different air inlet channels, and heat transfer between the wall face of the air inlet channel of the cylinder cover and air flowing through the wall face is effectively blocked.

Description

technical field [0001] The invention relates to an internal combustion engine, in particular to a thermal insulation structure of an intake passage on a cylinder head. Background technique [0002] In recent years, with the application of engine fuel-saving technology (such as Miller cycle) and the popularization of gasoline engine supercharged models, the control of engine intake temperature has been paid more and more attention by engine designers, such as the "intake air intake" disclosed in CN206522194U Cooling and heat insulation structure of the air passage” This structure is used to cool and insulate the air intake air passage installed in the cylinder head of the internal combustion engine to introduce the intake gas into the combustion chamber. A cooling channel is formed on the outer side of the upper wall of the downstream portion of the intake duct. Based on this structure, while the heat from the combustion chamber can be effectively shielded, the upper wall of...

AI Technical Summary

Problems solved by technology

[0005] (1) Coating technology is difficult, high cost and poor reliability;

[0006] (2) The design of the cooling liquid channel on the outer side of the upper wall of the downstream part of the air channel has great design limitations, and the effect is limited in the state of heat engine

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