Cylinder Head Vertical Wall Structure for Inter-Bore Sealing
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Solution Overview
Problem
Conventional cylinder head structures in water-cooled multicylinder engines face challenges in maintaining sealing force and rigidity due to narrow gaps and cooling water channels, leading to decreased gasket pressing force and inadequate transmission of axial force from fastening bolts, which limits the engine's output enhancement.
Innovation Solution
A cylinder head structure with a vertical wall spanning the head upper and bottom walls between adjacent cylinders, guided by fastening bolts, to enhance rigidity and evenly transmit axial force, thereby improving sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width between cylinders is reduced to increase engine output, then the sealing force between cylinders decreases
Solution Approach 1:
The cylinder head is divided into multiple reinforcement regions by partition walls. Each partition wall creates separate reinforcement zones that independently strengthen the gasket pressing force in specific areas between adjacent cylinders, allowing high sealing force without increasing overall cylinder spacing
Solution Approach 2:
Partition walls are strategically positioned at specific locations between adjacent cylinders where reinforcement is most needed. These localized structures provide enhanced sealing force precisely where required, rather than uniformly increasing the entire cylinder head structure
2Productivity
If the gasket width is reduced due to narrow inter-cylinder space, then the sealing force decreases
Solution Approach 1:
The gasket pressing force is segmented and distributed through multiple partition walls that create separate reinforcement zones. Each partition wall acts as an independent force transmission path, ensuring sufficient sealing force even with narrow gasket width between cylinders
Solution Approach 2:
Instead of increasing gasket width in the horizontal dimension, partition walls extend vertically through the cylinder head thickness, creating a three-dimensional reinforcement structure that compensates for the narrow horizontal gasket space
3Temperature
If the inter-bore portion has a hollow cross-section for cooling water channels, then the rigidity decreases
Solution Approach 1:
The hollow inter-bore portion is segmented into multiple compartments by partition walls. This segmentation creates a multi-chamber cooling water passage system that maintains cooling efficiency while the partition walls themselves provide structural reinforcement to the otherwise hollow section
Solution Approach 2:
Partition walls are positioned at specific locations within the hollow inter-bore portion where structural reinforcement is most needed. These localized walls provide rigidity precisely where the hollow structure would be weakest, without compromising the cooling water channel functionality
Data Source
AI summary
A cylinder head structure that can increase the rigidity of an area corresponding to an area between cylinder bores and improve a sealing force of an inter-bore corresponding portion positioned above between adjacent cylinders when enhancing the sealing force between a cylinder block and the cylinder head to improve engine output. The cylinder head structure includes: insertion walls through which right and left fastening bolts arranged between adjacent cylinders pass; a head upper wall connecting upper end portions of a pair of the insertion walls; and a cylinder head bottom wall, and a head cooling water channel is surrounded by those four walls (insertion walls, head upper wall, cylinder head bottom wall), and a vertical wall in a state of extending left and right spanning the head upper wall and the cylinder head bottom wall to block the head cooling water channel is formed between the pair of insertion walls.