Cylinder Liner Thermal Conductivity Segmentation

The outer circumferential surface is divided into multiple axial sections (upper, middle, lower portions) with different film configurations. The upper portion has a high thermal conductive film, the lower portion has a low thermal conductive film, and the middle portion has a laminated film structure. This segmentation allows different thermal conductivity requirements to be met in different sections, suppressing temperature differences along the axial direction.

Different thermal conductive properties are applied to different local sections of the cylinder liner based on their specific thermal requirements. The upper portion near the combustion chamber uses high thermal conductivity material to dissipate heat, while the lower portion uses low thermal conductivity material to maintain temperature. This local quality approach optimizes heat distribution throughout the liner.

The spraying device employs dynamic control of the spray parameters, adjusting the spray distance and material flow rate based on the axial position. When spraying the upper portion, the device maintains a closer distance with higher material flow to ensure sufficient thickness. When spraying the lower portion, it increases the distance and reduces material flow to achieve the desired thinner film, thus controlling thickness precision across different sections.

The spraying process changes key parameters (spray distance, material flow rate, spray pressure) according to the axial position on the cylinder liner. By dynamically adjusting these parameters, the system achieves different film thicknesses in different sections without requiring multiple spraying passes or complex masking operations.