Boat Intake Manifold Extension for Torque Adjustment
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Solution Overview
Problem
Existing boat propelling apparatuses face challenges in adjusting engine output characteristics due to limited space and increased manufacturing costs, as previous solutions require complex structures and multiple intake parts to achieve desired torque ranges.
Innovation Solution
A compact boat propelling apparatus with an intake manifold that includes a fitting portion for an extension member, allowing adjustment of air intake passage length without altering the manifold's shape, enabling easy manufacturing and reduced costs by using a common component for different output characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the length of air intake passage is increased to improve torque in middle to slow speed range, then engine output torque in middle to slow speed range is improved, but device complexity and manufacturing cost increase due to requiring multiple intake parts or complex structures
Solution Approach 1:
The intake manifold is designed with a detachable extension member that can be selectively attached or removed based on desired engine output characteristics. This dynamic configuration allows the same base manifold to serve multiple purposes - with the extension member for extended passage length (improved low-speed torque) and without it for shorter passage length (improved high-speed response), eliminating the need for multiple complex intake systems
Solution Approach 2:
The air intake passage is segmented into a base manifold and a separate extension member. This segmentation allows independent design and manufacturing of each component, with the extension member being a simple, low-cost part that can be easily attached to or removed from the base manifold, thereby reducing overall device complexity while achieving variable passage lengths
2Power
If different intake pipe lengths are used to adjust engine output characteristics for different speed ranges, then engine output characteristics are optimized, but manufacturing cost increases due to requiring multiple types of intake parts
Solution Approach 1:
The base intake manifold is designed as a universal component that can function with different extension member configurations. The same base manifold serves as the foundation for both short and long intake passage configurations, requiring only the optional addition or removal of the extension member to change performance characteristics, thereby significantly reducing manufacturing costs compared to producing entirely different intake systems
Solution Approach 2:
The extension member is designed as a simple, low-cost, easily replaceable component. Rather than investing in expensive, complex multi-purpose manifolds, the design uses a inexpensive extension piece that can be attached when low-speed torque is needed and removed when high-speed performance is prioritized, making cost-effective performance adjustment
3Power
If space is increased to accommodate longer air intake passages, then intake-air pulsation effect is improved, but engine room space requirement increases
Solution Approach 1:
The extension member is designed to nest within or attach to the existing base manifold structure. Rather than requiring additional external space, the extended passage length is achieved by utilizing the internal or peripheral space of the existing manifold, effectively nesting the extension within the original footprint and avoiding increased engine room space requirements
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 allows for sufficient adjustment of engine output torque behavior across speed ranges, reducing manufacturing complexity and costs while maintaining a compact design, enabling the production of boats with specific output characteristics for various purposes.
Implementation Method 1
The engine output characteristics can be adjusted by changing the length of air intake passage (air intake pipe) thereby making adjustment on an intake-air pulsation effect
Data Source
AI summary
A boat propelling apparatus is compact and capable of making an adjustment on its engine output characteristic. The boat propelling apparatus includes an engine, a surge tank and an intake manifold. The intake manifold includes therein an internal space for air to flow from the surge tank, and air intake passages branching from the internal space. The intake manifold includes recesses and a boss arranged to fit an extension member to define extension passages inside the internal space.