Multi-Cylinder Engine Cooling Device Uniform Temperature Distribution
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Solution Overview
Problem
Existing cooling systems for multiple cylinder engines fail to uniformly distribute temperature across cylinders, leading to temperature differences between upper and lower sides, exhaust and intake sides, and among cylinders, which results in heat deformation, increased sliding resistance, and decreased fuel efficiency.
Innovation Solution
A cooling device with a water jacket system that includes an introducing portion, a restrictor portion, and a discharging portion, where the passage cross-sectional area of the exhaust-side portion is larger than the intake-side portion, and a spacer within the water jacket to control the flow of cooling liquid, ensuring uniform cooling across all cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling liquid is supplied from one end of the cylinder row to the other end, then cooling coverage is improved, but temperature difference among cylinders increases
Solution Approach 1:
The water jacket is divided into multiple independent cooling passages, each serving specific cylinder regions. This segmentation allows targeted cooling of different cylinder zones without creating temperature gradients across the entire cylinder row, thereby reducing temperature differences among cylinders while maintaining effective cooling coverage.
Solution Approach 2:
Different regions of the water jacket are designed with different passage configurations tailored to local thermal requirements. The exhaust side has larger passage cross-sectional area for enhanced cooling, while the intake side has smaller area, creating non-uniform cooling distribution that compensates for exhaust heat to achieve uniform overall temperature distribution.
2Temperature
If cooling liquid flow rate to cylinder block is increased, then cooling efficiency is improved, but temperature difference between upper and lower sides increases
Solution Approach 1:
The water jacket is designed with non-uniform passage cross-sectional areas along the cylinder axis direction. The exhaust-side portion has a larger passage cross-sectional area to provide enhanced cooling to the hotter exhaust side, while the intake-side portion has a smaller area. This local variation in passage geometry allows different flow rates in different regions, compensating for the temperature difference between upper and lower sides while maintaining overall cooling efficiency.
3Temperature
If cooling liquid flow rate to exhaust side is increased, then exhaust side cooling is improved, but temperature difference between exhaust and intake sides increases
Solution Approach 1:
The water jacket incorporates a restrictor portion that creates different flow characteristics for exhaust side and intake side passages. The exhaust-side portion has a larger passage cross-sectional area with a restrictor that regulates flow to provide sufficient cooling to the hot exhaust side, while the intake-side portion has a smaller passage cross-sectional area that naturally limits flow. This local differentiation allows the exhaust side to receive appropriate cooling without creating excessive temperature differences between exhaust and intake sides.
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 suppresses temperature differences between upper and lower sides, exhaust and intake sides, and among cylinders, resulting in uniform temperature distribution, reduced heat deformation, improved fuel efficiency, and enhanced engine performance.
Implementation Method 1
a water jacket provided at a cylinder block so as to surround cylinder bores of a plurality of cylinders arranged in series
Implementation Method 2
a cooling liquid passage in which a cooling liquid circulates by a water pump
Implementation Method 3
a cooling liquid passage in which a cooling liquid circulates by a water pump, the cooling liquid passage extending through these water jackets and a radiator
Data Source
AI summary
The present invention is configured such that: a cylinder block includes an introducing portion provided at a first side of a cylinder row, cooling liquid being introduced through the introducing portion to a water jacket, a restrictor portion provided in a vicinity of the introducing portion and configured to restrict the cooling liquid, introduced through the introducing portion, from flowing to an intake-side portion of the water jacket, and a discharging portion provided at a middle portion of the cylinder row at an intake side, the cooling liquid being discharged from the water jacket through the discharging portion; and an exhaust-side portion of the water jacket is formed such that a passage cross-sectional area of a cylinder axis direction upper side of the exhaust-side portion is larger than the passage cross-sectional area of a cylinder axis direction lower side of the exhaust-side portion.