Bore Bridge Cooling Passage Geometry for Cylinder Bore Distortion
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Solution Overview
Problem
Existing cylinder block cooling systems face challenges in adequately cooling bore bridges, leading to cylinder bore distortion and liner degradation due to inadequate heat dissipation, particularly in regions between adjacent cylinders, and the use of separate cooling systems (water and oil) is complex and costly.
Innovation Solution
A cylinder block design with a coolant jacket partially surrounding the cylinders and a cooling passage within the bore bridge, featuring a non-cylindrical geometry formed by a lost core, which increases the surface area for heat exchange and extends deeper into the bore bridge to target hot spots, optimizing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cooling passage with one inlet and one outlet is used in the bore bridge, then the structure is simple, but adequate cooling for all engine types and modes of operation cannot be provided
Solution Approach 1:
The cooling passage is divided into multiple segments with multiple inlets and outlets, allowing independent control of coolant flow to different regions of the bore bridge. This segmentation enables optimized cooling for various engine operating conditions while maintaining reasonable structural complexity.
Solution Approach 2:
The cooling system incorporates variable geometry features that allow the cooling passage configuration to adapt dynamically to different engine operating modes, enabling optimal cooling efficiency across all conditions rather than being fixed for a single operating point.
2Reliability
If two separate cooling systems (water versus oil) are used, then cooling coverage is improved, but the system becomes complex and costly
Solution Approach 1:
Multiple cooling functions are merged into a single integrated cooling passage system that uses one coolant type. The unified passage design provides comprehensive cooling coverage that previously required separate water and oil cooling systems, reducing overall system complexity while maintaining adequate cooling performance.
Solution Approach 2:
The cooling passage is designed to perform multiple cooling functions simultaneously - cooling the deck face, cooling hot spots below the deck face, and providing adequate cooling coverage for all engine types and modes of operation - all through a single system using one coolant type.
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 effectively reduces cylinder bore distortion and extends engine life by ensuring thorough cooling of bore bridges, maintaining temperatures below critical thresholds and reducing manufacturing complexity.
Implementation Method 1
A coolant, such as water, oil, glycol, etc., may be pumped or otherwise sent through the cooling passages to remove heat from the cylinder block and the cylinder head via heat exchange
Implementation Method 2
A coolant, such as water, oil, glycol, etc., may be pumped or otherwise sent through the cooling passages to remove heat
Data Source
AI summary
Systems are provided for cooling a cylinder block via bore bridge cooling passages. In one example, a cylinder block with a bore bridge positioned between a first cylinder and a second cylinder, the cylinder block also including a coolant jacket at least partially surrounding the first cylinder and the second cylinder, has at least one cooling passage positioned within the bore bridge. An inlet of the at least one cooling passage has a larger area than an outlet of the at least one cooling passage and at least a portion of the at least one cooling passage has a non-cylindrical geometry formed by a lost core.