V-Twin Engine Cooling Fan Guide Body Airflow Distribution
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Solution Overview
Problem
Air-cooled V-twin combustion engines experience uneven cooling of engine cylinders due to inefficient distribution of cooling air, leading to temperature differences and inefficiencies in combustion and exhaust gas removal.
Innovation Solution
An air-cooled V-type combustion engine design featuring a guide body with an upright wall and ceiling wall that directs cooling air streams to both engine cylinders, regulating airflow to prevent leakage and ensure equal distribution, with the ceiling wall's position and shape optimizing airflow to address the cooling imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If simple spiral guide walls are used to separate cooling air, then cooling air can be directed towards engine cylinders, but cooling air leaks radially from the free ends of the guide walls and cannot be supplied in desired proportion
Solution Approach 1:
The guide body is segmented into multiple functional walls: upright walls that extend radially outwardly and spirally, ceiling walls that connect with the upright walls and extend spirally inwardly, and side walls. This segmentation allows each wall to perform a specific function in controlling cooling air flow, preventing leakage while directing air to both engine cylinders in desired proportions.
Solution Approach 2:
The guide body structure transitions from simple radial guide walls to a three-dimensional configuration with upright walls extending radially outwardly, ceiling walls connecting them, and side walls providing additional containment. This dimensional enhancement creates enclosed passages that prevent radial leakage while maintaining the spiral flow pattern needed for effective cooling air distribution.
2Temperature
If cooling air flows radially outwardly from trailing side towards leading side, then cooling fan assembly can be simple in structure, but the leading side engine cylinder receives insufficient cooling air
Solution Approach 1:
The cooling air passage is designed with predetermined curvature and direction changes that guide the cooling air flow in advance towards both engine cylinders. The spiral configuration of the upright walls and ceiling walls pre-establishes flow paths that ensure the leading side cylinder receives adequate cooling air before the air reaches the trailing side, preventing insufficient cooling at the leading side.
Solution Approach 2:
Different sections of the cooling air passage have different geometric characteristics tailored to local cooling requirements. The upright walls and ceiling walls are positioned and shaped to create regions of controlled flow resistance and direction, with the passage geometry varying along the spiral path to optimize cooling air distribution to each engine cylinder according to its specific thermal needs.
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 solution ensures efficient cooling of both engine cylinders by directing a sufficient amount of cooling air to each, minimizing leakage and temperature differences, thereby improving thermal efficiency and exhaust gas removal.
Implementation Method 1
a cooling fan assembly that is drivingly coupled with a rotary shaft of the combustion engine and operable to induce a cooling air for cooling the first and second combustion engine
Data Source
AI summary
A cooling fan assembly has an inner surface provided with a guide body for guiding a cooling air towards a first engine cylinder, positioned on a leading side with respect to the direction of rotation of the cooling fan assembly, and a second engine cylinder, positioned on a trailing side, after the cooling air has been separated. The guide body includes an upright wall protruding from the inner surface of the fan casing in an axial direction of the cooling fan assembly and extending radially outwardly and spirally from the inner surface of the fan casing as it progresses from the trailing side towards the leading side, and a ceiling wall connected with a projecting end of the upright wall and extending inside the spirality and operable to guide the cooling air inside the spirality of the upright wall towards the first engine cylinder.