Cylinder Housing Decoupling for Thermal and Mechanical Isolation
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Solution Overview
Problem
Cast cylinder housings with wet cylinder liners face mechanical and thermal disadvantages due to interconnected support structures between adjacent cylinders, leading to increased deformation and stress.
Innovation Solution
The support structures of adjacent cylinders are decoupled at the engine transverse plane, with a main bearing wall and hollow-cylindrical design, and screw receptacles are positioned to minimize mechanical and thermal coupling, allowing for optimal cooling and force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support structures of adjacent cylinders are connected to each other, then the mechanical strength and stability of the cylinder housing is improved, but the thermal coupling between cylinders increases and deformation of the cylinder liner increases
Solution Approach 1:
The support structures of adjacent cylinders are segmented and decoupled at the engine transverse plane, creating separate support zones for each cylinder. This segmentation reduces thermal coupling between cylinders while maintaining mechanical strength through the integral cast design of each support structure.
Solution Approach 2:
The cylinder housing exhibits local quality variations where the support structures have different configurations in different regions. The support structures are designed with specific geometries and cooling channel arrangements in different zones to optimize both mechanical strength and thermal management locally.
2Stability of the object's composition
If the support structures of adjacent cylinders are connected to each other, then the structural stability of the cylinder housing is improved, but the deformation of the cylinder liner increases
Solution Approach 1:
The support structures are segmented and decoupled at the engine transverse plane, creating independent support zones for each cylinder. This reduces mutual deformation between adjacent cylinders while maintaining overall structural stability through the integral cast design.
Solution Approach 2:
The support structures incorporate three-dimensional cooling channels and conically shaped transition regions that provide mechanical support and thermal management in multiple dimensions, reducing liner deformation through enhanced cooling efficiency and structural distribution.
3Temperature
If the coolant jacket is positioned in the upper third of the cylinder liner, then the cooling efficiency of high thermal stress areas is improved, but the structural complexity of the support structure increases
Solution Approach 1:
The coolant jacket is positioned specifically in the upper third of the cylinder liner where thermal stress is highest, providing localized cooling where it is most needed. The support structure incorporates conically shaped transition regions and integrated cooling channels that optimize cooling efficiency without excessive complexity.
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 deformation of the cylinder liner and improves mechanical and thermal decoupling between cylinders and cylinder head screws, enhancing the structural integrity and cooling efficiency of the cylinder housing.
Implementation Method 1
the cylinder liners on their outer jacket are flushed with coolant
Implementation Method 2
a coolant jacket is arranged between the support structure and the cylinder liner
Data Source
AI summary
Aspects of the present disclosure are directed to a cylinder housing of an internal combustion engine. In one embodiment of the present disclosure, the cylinder housing includes at least two adjacently arranged cylinders, each of which includes a wet cylinder liner, a support structure, and a coolant jacket arranged between the support structure and the cylinder liner. The cylinder housing further including at least one screw receptacle for a cylinder head screw, and is positioned between at least two adjacently arranged cylinders in a region of at least one engine transverse plane.