Engine Cooling Structure Inter-Bore Region Alignment
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Solution Overview
Problem
Current cooling structures for internal combustion engines face inefficiencies in cooling the inter-bore region between adjacent cylinder bores, particularly due to pressure losses and misalignment issues that affect coolant flow velocity and heat transfer coefficients.
Innovation Solution
A cooling structure comprising a cylinder block, cylinder head, and gasket with strategically positioned communication holes and openings that align coolant flow to optimize velocity and heat transfer, including tapered shapes and recessed grooves to enhance coolant flow and reduce resistance, ensuring efficient cooling of the inter-bore region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant passages are provided in the cylinder block and cylinder head, then cooling function is achieved, but pressure loss increases and coolant flow velocity decreases
Solution Approach 1:
The gasket is designed with communication holes positioned in advance to align with the block opening and head opening, ensuring optimal coolant flow path establishment before coolant injection, thereby reducing pressure loss and improving flow velocity
Solution Approach 2:
The communication holes in the gasket are strategically positioned at specific coordinates relative to the cylinder bank center line, optimizing the flow path geometry to reduce resistance and improve coolant flow characteristics without compromising cooling efficiency
2Productivity
If communication holes are provided in the gasket, then coolant flow between block and head is improved, but misalignment due to manufacturing errors reduces cooling effectiveness
Solution Approach 1:
The communication holes are positioned asymmetrically relative to the cylinder bank center line, with specific offset distances designed to compensate for typical manufacturing tolerances, ensuring optimal alignment and cooling effectiveness even when minor dimensional variations occur
Solution Approach 2:
The gasket serves as an intermediary component that bridges the cylinder block and cylinder head, with its communication holes acting as a mediator to ensure proper coolant flow alignment between the block opening and head opening, tolerating minor manufacturing variations
3Temperature
If the inter-bore region is cooled, then heat dissipation is improved, but complex passage configuration increases device complexity
Solution Approach 1:
The cooling system is segmented into distinct components: block-side coolant passage in the cylinder block, communication holes in the gasket, and head-side coolant passage in the cylinder head. This segmentation allows each component to be optimized independently while maintaining overall cooling effectiveness
Solution Approach 2:
The gasket serves multiple functions: it seals between the cylinder block and head, provides structural support, and acts as a flow distribution manifold through its communication holes. This multi-functionality reduces the need for additional dedicated cooling components, simplifying the overall system
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
The proposed cooling structure improves coolant flow velocity and heat transfer efficiency, effectively cooling the inter-bore region and combustion chamber periphery, even in the presence of manufacturing errors, by aligning coolant flow with the cylinder bank center line and optimizing the geometry of communication holes and passages.
Implementation Method 1
a block-side coolant passage which surrounds an entire circumference of cylinder bores... a head-side coolant passage... efficiently cooling the inter-bore region and the combustion chamber periphery
Implementation Method 2
improves coolant flow velocity... aligning coolant flow with the cylinder bank center line... optimizing the geometry of communication holes and passages
Data Source
AI summary
A cooling structure of an internal combustion engine includes a cylinder block, a cylinder head and a gasket. In a cross-section defined through an inter-bore region and perpendicular to the cylinder bank center line, a first end and a second end which face a cylinder bank center line are disposed nearer to the cylinder bank center line than a third end and a fourth end which face the cylinder bank center line, respectively. In the cross-section, a fifth end of a first communication hole facing the cylinder bank center line is provided between the first end of the head opening and the third end of the block opening. In the cross-section, a sixth end of a second communication hole facing the cylinder bank center line is provided between the second end of the head opening and the fourth end of the block opening.