Exhaust Side Block Insert for Cylinder Block Cooling
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Solution Overview
Problem
Conventional engine cooling systems fail to adequately reduce the temperature of the upper portion of the cylinder block, leading to issues like knocking and cracking, and inefficient cooling due to differing coolant temperatures and flow rates between the cylinder head and block.
Innovation Solution
An exhaust side block insert is introduced to separate the cooling of the cylinder head and block, with a gasket dividing the exhaust side water jacket into upper and lower flow passages, ensuring continuous cooling of the exhaust side upper portion and allowing for separate control of coolant flow rates, enhancing engine cooling efficiency and preventing knocking or cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coolant temperature control apparatus is used for the cylinder block and cylinder head, then the structure is simple, but the cooling efficiency is reduced due to inability to separately control temperatures
Solution Approach 1:
The water jacket is divided into a cylinder head water jacket and a cylinder block water jacket, with separate coolant flow passages. The cylinder block water jacket is further segmented into multiple regions (intake side, exhaust side, upper, lower) with independent flow control, allowing separate temperature control for each region while maintaining structural simplicity
Solution Approach 2:
Variable separation cooling techniques are implemented with controllable coolant flow rates that can be dynamically adjusted. The system can switch between different cooling modes (parallel flow, U-turn flow, independent flow) based on operating conditions, enabling optimal cooling efficiency under various engine states
2Ease of operation
If coolant forms a U-turn flow in the cylinder block, then the coolant can reach the cylinder head, but the upper portion (particularly exhaust side upper portion) of the cylinder block cannot be sufficiently cooled
Solution Approach 1:
The cylinder block water jacket is divided into multiple independent flow passages including an upper flow passage and a lower flow passage. The upper flow passage is specifically designed to cool the upper portion of the cylinder block, while the lower flow passage cools the lower portion, allowing independent temperature control for each region
Solution Approach 2:
Different cooling strategies are applied to different regions of the cylinder block. The exhaust side upper portion receives dedicated cooling through the upper flow passage with optimized coolant flow rate, while other regions use different flow patterns, ensuring each area is cooled according to its specific thermal requirements
3Reliability
If the temperatures and flow rates of coolant for cooling the respective cylinders are made different, then cooling efficiency improves, but the device complexity increases
Solution Approach 1:
The system implements variable separation cooling with controllable coolant flow rates that can be dynamically adjusted based on engine operating conditions. Multiple flow patterns (parallel flow, U-turn flow, independent flow) can be switched between, allowing optimal cooling efficiency under various states without requiring overly complex control mechanisms
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 effectively maintains the exhaust side upper portion of the cylinder block at a stable temperature, preventing knocking and cracking, while improving engine cooling efficiency and enhancing cold start performance and fuel efficiency by allowing for independent control of coolant flow.
Implementation Method 1
The water jacket guides the flow of coolant discharged from the water pump, to the entire region in the cylinder block and the cylinder head so that the working temperature of the engine can be maintained within a normal temperature range during the entire operation period of the engine
Implementation Method 2
the water jacket functions as a flow passage of coolant provided for preventing critical components such as the cylinder block, the cylinder head and the pistons from being thermally damaged by high-temperature (approximately, 2500° C.) heat generated during a combustion process
Implementation Method 3
An exhaust side block insert is introduced to separate the cooling of the cylinder head and block, with a gasket dividing the exhaust side water jacket into upper and lower flow passages, ensuring continuous cooling of the exhaust side upper portion
Data Source
AI summary
A cylinder block assembly may include a cylinder block, a cylinder body disposed in the cylinder block, with a plurality of cylinder bores formed in the cylinder body, a fluid jacket, which is formed between an inner circumferential surface of the cylinder block and an outer circumferential surface of the cylinder body, and through which coolant flows, and a block insert disposed in the water jacket and configured to guide a flow of coolant, wherein the cylinder block may include a second block coolant outlet, which is formed at a second side in a surface of an exhaust side of the cylinder block, and through which the coolant in the water jacket is discharged, and wherein the exhaust side may include a side at which combustion gas is exhausted out of the cylinder body.