Cylinder Block Insert Cooling Water Flow Velocity
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Solution Overview
Problem
In vehicle engines, the variable dividing cooling technology to control cooling water in the cylinder head and block separately leads to excessive temperature rise in the siamese portion and piston top ring portion during combustion, aggravating knocking characteristics and limiting fuel efficiency and durability in low and medium-speed, high-load areas.
Innovation Solution
A block insert is designed with a cooling hole in the siamese portion of the cylinder block to increase the flow velocity of cooling water, featuring flow resistance portions, an insert support portion, and a bridge to guide cooling water flow, with a curvature on the inner side surface to enhance flow velocity and prevent temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the overall temperature of the cylinder block is increased to prevent piston friction, then fuel efficiency is improved, but the temperature of the siamese portion and piston top ring portion excessively rises upon combustion, aggravating knocking characteristics
Solution Approach 1:
The patent applies local quality by creating a dedicated cooling hole in the siamese portion of the cylinder block, allowing localized cooling in this specific high-temperature area while maintaining higher overall block temperature for fuel efficiency. The cooling hole is positioned to directly cool the siamese portion and piston top ring area, addressing the local overheating problem without reducing the global temperature needed for low friction.
2Stability of the object's composition
If the flow rate of cooling water in the cylinder block is increased at high-speed, high-load operation to lower the temperature of the cylinder, then combustion stability is improved, but the temperature of the siamese portion excessively rises, aggravating knocking characteristic
Solution Approach 1:
The patent segments the cooling system into two independent pathways: the existing water jacket for general cylinder block cooling that maintains combustion stability, and a new dedicated cooling hole in the siamese portion for localized temperature control. This segmentation allows the cooling water flow to be divided, with part of the flow directed through the cooling hole to specifically address the siamese portion overheating while the rest maintains overall combustion stability.
3Loss of energy
If variable dividing cooling technology is implemented to control cooling water separately, then fuel efficiency and combustion stability are improved, but the structure complexity increases due to removal of water holes in head gasket
Solution Approach 1:
The patent extracts the cooling function for the siamese portion from the general water jacket system by creating a separate cooling hole directly in the siamese portion of the cylinder block. This extraction allows independent control of cooling in the critical siamese area without requiring complex modifications to the head gasket or water pump control mechanisms, thereby achieving variable dividing cooling with minimal structural complexity increase.
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 solution effectively prevents excessive temperature rise in the siamese portion and piston top ring portion, improving fuel efficiency and durability by maintaining the cylinder block temperature while reducing knocking characteristics in low and medium-speed, high-load operations.
Implementation Method 1
increasing a flow velocity of the cooling water flowing into the cooling hole and a flow rate passing through an inside of the cooling hole
Implementation Method 2
a temperature of a siamese portion of a cylinder block and a temperature of a piston top ring portion from excessively rising upon combustion
Data Source
AI summary
A cylinder structure of a vehicle engine comprises a cylinder block including: a block cooling water inlet formed on one side surface of the cylinder block and introduced with cooling water from a water pump; and a block cooling water outlet formed on a rear surface of the cylinder block and having the cooling water discharged therethrough. A cylinder disposed inside the cylinder block, and a water jacket is formed between an inner circumferential surface of the cylinder block and an outer circumferential surface of the cylinder to flow the cooling water therethrough. A block insert is inserted into a lower portion of the water jacket to guide the flow of the cooling water.