Boat Propulsion Variable Speed Mechanism Oil Lubrication
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Solution Overview
Problem
Conventional boat propulsion units with fixed reduction ratios face challenges in achieving both high acceleration performance at low speeds and maximum speed, as they either compromise on acceleration or maximum speed, and suffer from energy loss due to oil viscosity in variable speed mechanisms.
Innovation Solution
A boat propulsion unit with a variable speed mechanism that allows speed change by both low and high reduction ratios, combined with an oil tank and lubrication route to prevent oil retention and minimize energy loss, ensuring the mechanism is not soaked in oil, thus enhancing both acceleration and maximum speed performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a variable speed mechanism portion is added to achieve both high acceleration and maximum speed, then both acceleration performance and maximum speed can be improved, but the mechanism becomes soaked in oil causing energy loss due to viscosity
Solution Approach 1:
The patent divides the lubrication system into separate components: an oil tank housing and a variable speed mechanism housing. The oil tank housing contains the oil reservoir, while the variable speed mechanism housing contains the gears and transmission components. This segmentation prevents the variable speed mechanism from being soaked in oil, eliminating energy loss due to viscosity while maintaining the benefits of variable speed operation for both acceleration and maximum speed performance.
2Device complexity
If a fixed reduction ratio power transmission mechanism is used, then the structure is simple, but it is difficult to achieve both high acceleration performance and maximum speed
Solution Approach 1:
The patent employs a variable speed mechanism portion that can dynamically change reduction ratios between low and high settings. This allows the system to adapt to different operating conditions: using high reduction ratio for acceleration and low reduction ratio for maximum speed, thereby achieving both performance targets without excessive 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
The solution enables the boat propulsion unit to achieve desired levels of acceleration and maximum speed while minimizing energy loss by preventing oil retention and viscosity-related issues, thereby optimizing performance.
Implementation Method 1
an oil lubrication route arranged to supply oil in the oil tank to the first housing and collecting the oil supplied to the first housing in the oil tank
Implementation Method 2
the gear is prevented from rotating due to viscosity of the oil and the like, so that there is a problem that the loss of the driving energy of the engine occurs
Data Source
AI summary
An outboard motor includes a variable speed mechanism portion arranged to transmit a driving force to propellers such that the driving force is changed in its speed by a low reduction ratio and a high reduction ratio, an upper housing that houses the variable speed mechanism portion, oil tanks provided on the outside of the upper housing and arranged to retain oil to be supplied to the upper housing, and an oil lubrication route arranged to supply oil in the oil tanks to the upper housing and to collect the oil supplied in the upper housing in the oil tanks. The above arrangement provides a boat propulsion unit capable of allowing both a performance of acceleration and a maximum speed to approach a level desired by a user and to prevent the occurrence of a loss of the driving energy of an engine.