Cylinder Head Material Cutout for Thermal Decoupling
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Solution Overview
Problem
Existing cylinder heads for internal combustion engines are complex and costly to produce and assemble, particularly in achieving effective thermal insulation for exhaust gas ducts, which affects cooling requirements and engine efficiency.
Innovation Solution
Incorporating a material cutout for thermal insulation between the fluid conducting duct and the cooling duct in the cylinder head, allowing for reduced heat transfer and improved thermal decoupling, which can be produced during primary forming or subsequent processes like casting or 3D printing, thereby simplifying production and enhancing insulation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal insulation is achieved using known apparatuses (inserts, air gaps, stepped shoulders), then thermal insulation effect is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the thermal insulation function with the cylinder head main body by integrating the material cutout directly into the casting process. This merges the insulation structure with the primary component, eliminating the need for separate insulation inserts or complex assembly steps, thereby reducing device complexity while maintaining thermal insulation effectiveness
Solution Approach 2:
The material cutout is formed during the primary casting process of the cylinder head main body, before final assembly. This preliminary action integrates the insulation structure into the main body manufacturing, avoiding subsequent complex assembly operations and reducing overall manufacturing complexity
2Ease of manufacture
If material cutout is formed during primary forming (casting), then ease of manufacture is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the casting process parameters to form the material cutout, leveraging the fluidity and moldability of molten material during primary forming. By adjusting casting parameters such as mold design, pouring temperature, and cooling rate, the cutout geometry is achieved with sufficient precision for thermal insulation functionality, balancing ease of manufacture with acceptable manufacturing precision
3Use of energy by moving object
If thermal decoupling is achieved between fluid conducting duct and cooling duct, then fuel consumption is reduced, but cooling duct design complexity increases
Solution Approach 1:
The patent extracts heat from the thermal coupling between the fluid conducting duct and cooling duct by introducing the material cutout. This removal of thermal connection reduces unwanted heat transfer, decreasing the cooling load and thereby reducing fuel consumption associated with coolant pumping, while the cutout itself provides a simple geometric solution rather than complex active control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces cooling requirements, decreases fuel consumption, and increases exhaust gas enthalpy available for turbochargers and aftertreatment systems, leading to improved engine efficiency and reduced fuel usage.
Implementation Method 1
at least one material cutout for thermal insulation which is formed in a main body of the cylinder head
Data Source
AI summary
The disclosure relates to a cylinder head for covering a combustion chamber of an internal combustion engine. The cylinder head comprises at least one material recess for heat isolation, which is formed in a main body of the cylinder head and is arranged between a fluid-guide channel and a cooling channel. The material recess can be produced e.g. directly during the shaping (e.g. casting or pressing) of the cylinder head and/or thereafter. For example, in the event that exhaust gas is guided through the fluid-guide channel, a significantly lower heat input occurs from the hot exhaust gas into the cooling fluid. In addition, the thermal decoupling via the material recess leads to the hot exhaust gas cooling to a lesser degree in the fluid-guide channel.