Boat Propulsion Cooling Flow Rate Regulator
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Solution Overview
Problem
Conventional outboard motors have a low engine warm-up speed due to the continuous flow of cooling water around the engine, even when the engine temperature is low enough to not require cooling.
Innovation Solution
A boat propulsion device with a cooling water flow path that includes a first flow path around the engine and a second flow path branching from the first path, regulated by a flow rate controller to adjust cooling water flow rates, reducing the volume of cooling water near the engine when it is not needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling water continuously flows around the engine, then the engine is adequately cooled, but the engine warm-up speed decreases
Solution Approach 1:
The cooling water flow rate is made dynamically adjustable based on engine temperature conditions. The flow rate regulator changes the flow rate according to whether the engine requires cooling or warm-up, transforming the static continuous flow system into a dynamic variable flow system that adapts to different thermal states of the engine.
Solution Approach 2:
The physical parameter of cooling water flow rate is changed based on engine temperature conditions. When the engine temperature is low, the flow rate is reduced or stopped; when the engine temperature rises to require cooling, the flow rate is increased. This parameter change resolves the contradiction by making the cooling system responsive to actual thermal needs.
2Speed
If a flow rate regulator is added to control cooling water flow, then the engine warm-up speed increases, but the device complexity increases
Solution Approach 1:
The cooling water flow path is segmented into multiple sections with different functions: a first flow path that passes around the engine for cooling, and a second flow path that branches off and does not pass around the engine. The flow rate regulator is positioned to control flow distribution between these segments, allowing independent control of cooling flow without affecting the overall system structure excessively.
Solution Approach 2:
The flow rate regulator acts as an intermediary device that mediates between the cooling water supply and the engine cooling requirement. By positioning the regulator at a strategic point in the flow path where it can control the distribution between the first and second flow paths, the system achieves flow control with minimal structural complexity.
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 configuration increases the engine warm-up speed by reducing cooling water volume, enhancing engine warm-up efficiency.
Implementation Method 1
the flow rate regulator is configured to change a flow rate of the cooling water flowing into the first flow path or change a flow rate of the cooling water flowing out of the first flow path
Data Source
AI summary
A boat propulsion device includes an engine, an oil pan to store oil to be supplied to the engine, a case to accommodate at least a portion of the oil pan, and a pump to pump cooling water to a cooling water flow path in the boat propulsion device. The cooling water flow path includes a first flow path between the oil pan, the case, and the engine, and a second flow path branching from the first flow path at a location between the oil pan and the case and not extending to the engine. The boat propulsion device further includes a flow rate regulator to change at least one of a flow rate of the cooling water flowing into the first flow path and a flow rate of the cooling water flowing out of the first flow path.