Cylinder Block Cooling Channel Layout for Stable Coolant Flow
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Solution Overview
Problem
The existing cylinder block design in JP 10-288080 A omits one downstream channel, leading to a decrease in coolant flow rate when coolant flows into the downstream channel from the upstream channels.
Innovation Solution
The cylinder block design includes a through channel with a first and second upstream channel connected to a downstream channel, where the downstream channel's upstream-side portion has a larger cross-sectional area than the downstream-side portions of the upstream channels, ensuring a consistent coolant flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one downstream channel is omitted in the through channel design, then the device complexity is reduced, but the coolant flow rate decreases
Solution Approach 1:
The patent changes the cross-sectional area parameter of the downstream channel, making it larger than the upstream channels to compensate for the reduced number of downstream channels. This parameter adjustment maintains the coolant flow rate while simplifying the overall channel structure.
Solution Approach 2:
The patent applies different cross-sectional areas to different portions of the channel. The downstream channel has a larger cross-sectional area compared to the upstream channels, creating a local quality difference that optimizes coolant flow distribution and maintains flow rate despite structural simplification.
2Manufacturing precision
If the downstream channel has the same cross-sectional area as upstream channels, then the manufacturing precision is simplified, but the coolant flow rate becomes insufficient
Solution Approach 1:
The patent deliberately changes the cross-sectional area parameter of the downstream channel to be larger than that of the upstream channels. This parameter change ensures sufficient coolant flow rate while maintaining manufacturing feasibility through a clear, simple geometric modification.
3Quantity of substance
If the downstream channel cross-sectional area is increased, then the coolant flow rate is maintained, but the volume of the cylinder block increases
Solution Approach 1:
The patent applies a localized increase in cross-sectional area only to the downstream channel portion, rather than uniformly increasing all channel dimensions. This local quality adjustment maintains coolant flow rate while minimizing the overall volume increase of the cylinder block.
Solution Approach 2:
The patent merges the flow paths by having multiple upstream channels converge into a single downstream channel with increased cross-sectional area. This merging approach maintains flow rate efficiency while reducing the total number of channels and minimizing volume occupation.
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 suppresses a decrease in coolant flow rate and prevents the coolant flow from becoming insufficient, while maintaining a compact cylinder block size and simplifying manufacturing processes.
Implementation Method 1
a channel cross-sectional area of the upstream-side portion of the downstream channel is larger than a channel cross-sectional area of the downstream-side portion of the first upstream channel, and also is larger than the channel cross-sectional area of the downstream-side portion of the second upstream channel
Data Source
AI summary
The cylinder block includes a plurality of cylinder bores, a water jacket surrounding the plurality of cylinder bores, and a through channel that extends between adjacent cylinder bores and through which the coolant from the water jacket 30 flows. The through channel has a first upstream channel having an upstream end connected to the water jacket, a second upstream channel having an upstream end connected to the water jacket, and a downstream channel connected to a downstream end of the first upstream channel and a downstream end of the second upstream channel. The channel cross-sectional area of the downstream channel is larger than the channel cross-sectional area of the first upstream channel and is larger than the channel cross-sectional area of the second upstream channel.