Cylinder Head Cooling Passage for Multi-Cylinder Engine
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Solution Overview
Problem
The existing multi-cylinder engine designs experience increased thermal loads between collective exhaust passage parts in the cylinder head, leading to potential distortion and adverse effects on peripheral instruments due to alternating exhaust gas flow.
Innovation Solution
Incorporating an intermediate cooling medium passage between collective exhaust passage parts, with upper and lower passage parts to absorb heat generated from these areas, and optimizing the location of exhaust passage openings to reduce thermal load and exhaust resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two exhaust passage groups with collective exhaust passage parts are disposed inside the cylinder head, then exhaust gas collection efficiency is improved, but thermal load in the area between collective exhaust passage parts increases
Solution Approach 1:
A cooling medium passage is introduced as an intermediary element between the two collective exhaust passage parts. This cooling passage acts as a mediator that absorbs and carries away heat generated from the exhaust passages, preventing heat accumulation in the area between them while maintaining the dual exhaust passage configuration for efficient exhaust gas collection.
Solution Approach 2:
The invention utilizes hydraulic cooling by circulating a cooling medium through a dedicated cooling medium passage. This hydraulic system efficiently removes heat from the area between collective exhaust passage parts, solving the thermal load problem while preserving the exhaust gas collection efficiency provided by the dual exhaust passage groups.
2Temperature
If cooling medium passage is added between collective exhaust passage parts, then thermal load is reduced, but device complexity increases
Solution Approach 1:
The cooling medium passage is designed to serve multiple functions: it cools the area between collective exhaust passage parts, and can be integrated with existing cooling systems in the engine. This multi-functionality approach reduces the need for separate cooling components, thereby minimizing the increase in device complexity while effectively reducing thermal load.
Solution Approach 2:
The invention merges the cooling function into the existing cylinder head structure by integrating the cooling medium passage with the overall cooling system architecture. This consolidation approach avoids adding standalone cooling components, thus reducing the perceived complexity increase while achieving effective thermal load management.
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 configuration effectively reduces thermal loads between collective exhaust passage parts, minimizes distortion, and enhances exhaust efficiency by collecting kinetic energy with a turbocharger and reducing exhaust interference through alternate fuel injection.
Implementation Method 1
heat generated from the first collective exhaust passage part and heat generated from the second collective exhaust passage part are absorbed by the intermediate passage part of the cooling medium passage
Implementation Method 2
the heat transmitted upward from the first collective exhaust passage part and the heat transmitted upward from the second collective exhaust passage part are absorbed by the first and second upper passage parts
Data Source
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AI summary
A multi-cylinder engine having an engine body with a cylinder head, and mounted on a vehicle is provided. The engine includes first and second cylinder groups each provided to the engine body and comprised of first and second pluralities of cylinders, first and second exhaust passage groups each having first and second pluralities of independent exhaust passage parts provided to the cylinder head and connected to the first and second cylinder groups, respectively, and first and second collective exhaust passage parts provided to the cylinder head and collecting the first and second pluralities of independent passage parts downstream in an exhaust gas flow direction, and a cooling medium passage provided in the cylinder head, through which a cooling medium flows, and having an intermediate passage part provided between the first collective exhaust passage part and the second collective exhaust passage part.