Boat Propulsion Device Cooling Electrical Components
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Solution Overview
Problem
Existing boat propulsion devices face challenges in efficiently cooling electrical components while minimizing size and preventing wiring deterioration due to engine vibrations.
Innovation Solution
The device incorporates an attachment portion integrated with the engine unit's coolant passage to attach the electrical component, and a holder to manage the wiring, ensuring effective cooling and reducing vibration-induced stress on the wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electrical component is installed inside the engine cover to cool it, then the cooling efficiency is improved, but the wiring may deteriorate due to vibration transmitted through the exhaust pipe
Solution Approach 1:
The patent introduces a vibration isolating member as an intermediary element between the exhaust pipe and the electrical component mounting portion. This isolating member absorbs and dampens vibration transmitted through the exhaust pipe, preventing direct transmission to the electrical component and its wiring, thus resolving the contradiction between cooling efficiency and wiring reliability
2Device complexity
If the electrical component is mounted on the exhaust pipe cover to reduce part count, then the number of parts is reduced, but the wiring interferes with surrounding components due to vibration
Solution Approach 1:
The vibration isolating member serves as a mediator that reduces vibration amplitude transmitted to the wiring, thereby minimizing wiring interference with surrounding components while maintaining the compact mounting configuration on the exhaust pipe cover
Solution Approach 2:
The vibration isolating member is constructed from elastic or viscoelastic materials that can deform to absorb vibration energy, effectively reducing the harmful vibration effects on the wiring without adding significant structural complexity
3Temperature
If the electrical component is installed inside the engine cover to cool it, then the cooling efficiency is improved, but the size of the boat propulsion device increases
Solution Approach 1:
The patent merges the electrical component mounting function with the existing exhaust pipe cover structure. By utilizing the exhaust pipe cover as the mounting surface and integrating the vibration isolating member into this existing component, the solution achieves effective cooling and vibration isolation without adding separate mounting structures that would increase the overall device size
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 enhances cooling efficiency, reduces part count, and prevents wiring deterioration by synchronizing the electrical component and wiring vibrations, maintaining a compact design.
Implementation Method 1
The coolant passage is configured to cool the engine or the exhaust pipe
Implementation Method 2
the vibration of the engine will be transmitted to the electrical component via the exhaust pipe, causing the electrical component to vibrate
Data Source
AI summary
A boat propulsion device includes an engine unit, an attachment portion, an electrical component, wiring, a holder, and an engine cover. The engine unit includes an engine, an exhaust pipe, and a coolant passage. The engine includes a crankshaft which extends vertically. The exhaust pipe is connected to the engine. The coolant passage is configured to cool the engine or the exhaust pipe. The attachment portion is provided integrally with the engine unit on the outside of the coolant passage. The electrical component is attached to the attachment portion. The wiring is connected to the electrical component. The holder is connected to the engine unit on the outside of the coolant passage and holds the wiring. The engine cover houses the engine unit, the attachment portion, the electrical component, the wiring, and the holder.