Engine Water Jacket with Insert Member for Cross-Flow Cooling
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Solution Overview
Problem
Conventional engine water jackets fail to effectively cool the cylinder block and cylinder head, leading to thermal deformation, lubrication issues, and inefficient fuel consumption, as well as increased investment costs due to the need for additional cooling measures and performance deterioration.
Innovation Solution
A water jacket design featuring a cross-flow type coolant that separates the cylinder block into upper and lower sections, allowing for individual cooling of the cylinder head and cylinder block, with an insert member partitioning the block water jacket to enable cross-flow cooling, optimizing temperature control and reducing frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional water jacket is used to cool the engine, then the coolant circulates sequentially through each cylinder, but the cylinder block and cylinder head corresponding to the combustion chamber cannot be effectively cooled
Solution Approach 1:
The water jacket is divided into multiple independent channels: a first water jacket channel for the cylinder block and a second water jacket channel for the cylinder head. This segmentation allows coolant to flow simultaneously and independently to both components, ensuring effective cooling of previously under-cooled areas without compromising overall system performance.
Solution Approach 2:
Different cooling strategies are applied to different parts of the engine. The cylinder head receives dedicated cooling through the second water jacket channel with appropriate flow rate, while the cylinder block receives cooling through the first water jacket channel. This localized approach ensures each component receives the specific cooling it needs to maintain optimal temperature and performance.
2Reliability
If the cylinder head is cooled to a lower temperature than the cylinder block, then knocking is prevented and ignition timing control is improved, but it is difficult to respectively control temperatures of the coolant
Solution Approach 1:
The cooling system is segmented into independent channels for the cylinder block and cylinder head, allowing separate temperature control for each component. This enables the cylinder head to be cooled to a lower temperature for preventing knocking while the cylinder block maintains its own optimal temperature, all through a unified water pump system without requiring separate control mechanisms.
Solution Approach 2:
The flow rate of coolant is adjusted independently for each channel based on the specific cooling requirements of the cylinder block and cylinder head. By changing the flow rate parameter for each segment, the system achieves different temperature levels for different components without requiring complex separate control systems.
3Temperature
If the temperature of the coolant is low, then the engine is cooled effectively, but viscosity of oil is increased so that frictional force is increased, causing increase of fuel consumption
Solution Approach 1:
The system maintains different temperature levels in different parts of the engine. The cylinder head is cooled to prevent knocking, while the cylinder block maintains a temperature that prevents excessive oil viscosity. This localized temperature control optimizes both cooling effectiveness and fuel consumption by avoiding uniform low-temperature cooling throughout the entire engine.
Solution Approach 2:
The coolant flow rate is optimized for each channel to achieve the desired temperature balance. By adjusting the flow rate parameter, the system ensures the cylinder head reaches the lower temperature needed for knocking prevention while the cylinder block maintains a temperature that keeps oil viscosity within optimal ranges, thereby reducing frictional losses and fuel consumption.
4Use of energy by moving object
If the temperature of the coolant is excessively high, then fuel consumption efficiency is improved, but knocking is generated which causes control of ignition timing
Solution Approach 1:
The cooling system is divided into separate channels allowing independent temperature control. The cylinder head can be cooled sufficiently to prevent knocking and maintain reliable ignition timing, while the cylinder block maintains higher temperatures for optimal fuel consumption efficiency. This segmentation resolves the contradiction by allowing different temperature regimes in different engine components simultaneously.
Solution Approach 2:
Different temperature conditions are created in different engine regions. The cylinder head operates at lower temperatures to prevent knocking and ensure reliable ignition timing control, while the cylinder block operates at higher temperatures to maintain good fuel consumption efficiency. This local differentiation of thermal conditions allows both fuel efficiency and reliability to be optimized simultaneously.
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 enhances engine durability, prevents knocking, minimizes fuel consumption, and improves overall fuel efficiency by maintaining optimal engine temperatures, reducing viscosity and frictional forces.
Implementation Method 1
a coolant circulating the water jacket cools metal surfaces such as the periphery of a spark plug that corresponds to the combustion chamber, an exhaust port, and the periphery of a valve sheet
Implementation Method 2
a water jacket is provided in the inside of a cylinder block and a cylinder head of a conventional engine, and a coolant circulating the water jacket cools metal surfaces
Data Source
AI summary
A water jacket apparatus for an engine may include a block water jacket provided in the cylinder block, interposing the combustion chamber therebetween, a head water jacket provided in the cylinder head corresponding to the combustion chamber, and an insert member portioning the block water jacket into an upper block water jacket and a lower block water jacket by being inserted into an upper portion of the block water jacket, and enabling the upper block water jacket to be interworked with the head water jacket.