Siamese Cylinder Bore Bridge Cooling via Segmented Flow Paths
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Solution Overview
Problem
Internal combustion engines with Siamese cylinders face challenges in cooling the bore bridge due to limited pressure differential and flow area in existing cooling channels, leading to increased temperatures and packaging difficulties.
Innovation Solution
An open deck cylinder block design with a Siamese cylinder configuration featuring a cooling channel that extends across the bore bridge from one side of the water jacket to the other, cooperating with a cylinder head gasket to maintain a consistent cross-sectional flow area and ensure adequate coolant flow through elongate channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling channels are drilled within the bore bridge extending between the water jacket and cylinder head, then cooling capability is improved, but the pressure differential and channel cross sectional area are limited reducing coolant flow
Solution Approach 1:
The cooling system is segmented into multiple independent channels: a first cooling channel in the bore bridge, a second cooling channel in the gasket, and a third cooling channel in the cylinder head. This segmentation allows each channel to be optimized independently for flow area and pressure differential, overcoming the limitations of a single channel design.
Solution Approach 2:
The cooling path is extended into a new dimension by routing coolant through the gasket thickness direction. The second cooling channel in the gasket creates an additional flow path that bypasses the limited cross-sectional area of the bore bridge channel, effectively adding a dimensional route for coolant flow.
2Temperature
If cooling channels are drilled within the bore bridge, then cooling capability is improved, but the packaging of the cooling system becomes difficult
Solution Approach 1:
The gasket is merged with cooling functionality by incorporating the second cooling channel directly into the gasket structure. This combines the sealing function of the gasket with the cooling function, eliminating the need for separate cooling components in the packaging space.
Solution Approach 2:
The gasket serves multiple functions: it provides the sealing interface between the cylinder block and cylinder head, and simultaneously houses the second cooling channel for coolant flow. This multi-functionality reduces the number of separate components needed in the engine assembly.
3Temperature
If the cooling channel extends across the entire bore bridge to the water jacket on the other side, then cooling coverage is improved, but the cross sectional flow area decreases limiting coolant flow
Solution Approach 1:
The first cooling channel in the bore bridge extends only partially across the bore bridge to a termination point short of the opposite water jacket. This partial action is sufficient when combined with the second channel in the gasket and third channel in the cylinder head, achieving adequate cooling coverage without the flow area penalty of a complete cross-bore-bridge channel.
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 enhances coolant flow across the bore bridge, effectively reducing temperature and improving cooling efficiency by maintaining a consistent cross-sectional flow area, thereby addressing the limitations of existing cooling systems.
Implementation Method 1
Heat is transferred to the liquid coolant from the engine components when the coolant flows through the various passageways in the engine components
Implementation Method 2
Heat is then transferred from the liquid coolant to the surrounding environment through a heat exchanger, such as a radiator
Data Source
AI summary
An engine is provided with an open deck cylinder block having an open water jacket that surrounds a plurality of cylinders that are joined together in a Siamese design by a cylinder bore bridge. The engine also includes a cylinder head gasket, and a cylinder head. For the purpose of removing excess heat from the cylinder bore bridge, cooling channels are provided that allow coolant to flow from the engine block water jacket, across the cylinder bore bridge, and into a cylinder head coolant passageway. In addition, coolant is prevented from flowing from the water jacket on one side of the cylinders, across the bore bridge, and into the water jacket on the other side of the cylinders.