Jet Propulsion Boat Deflector Trim Control

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Solution Overview

Problem

Conventional jet propulsion boats lack stabilization and control when shifting from reverse motion to other positions, requiring manual operation of the steering nozzle, which is cumbersome for operators.

Innovation Solution

A jet propulsion boat equipped with a deflector drive mechanism and control system that automatically adjusts the deflector's trim position in response to shifting operations, allowing for stable control and eliminating the need for manual adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the bucket is moved to the operating position for reverse motion, then reverse motion performance is improved, but the boat body cannot be stabilized and controlled when switching to other positions

Engineering Contradiction:

Improvereverse motion performanceVSAvoidboat body control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The deflector is preliminarily positioned at a first trim position when the reverse lever is in the reverse motion position, optimizing reverse motion performance. When switching to other positions, the deflector automatically moves to a second trim position in advance, ensuring immediate boat body stability without requiring manual intervention.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control system continuously monitors the reverse lever position and automatically adjusts the deflector trim position accordingly. This feedback mechanism ensures that the deflector is always in the optimal position for the current operating mode, maintaining both reverse motion performance and boat body control.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If manual trim adjustment is used to change deflector position, then boat body orientation can be adjusted, but operator workload increases

Engineering Contradiction:

Improveboat body orientation adjustmentVSAvoidoperator workload

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The deflector trim adjustment system operates autonomously based on the reverse lever position. The control system automatically commands the deflector to move between first and second trim positions according to the operating mode, eliminating the need for manual trim adjustment and reducing operator workload while maintaining full adaptability of boat body orientation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The manual mechanical trim adjustment system is replaced with an automated control system that uses electrical or electronic signals to actuate the deflector. This substitution eliminates manual intervention while preserving the ability to adjust boat body orientation to various positions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9969473B2Jet propulsion boat

Publication Date: 2018.05.15 YAMAHA MOTOR CO LTD

AI summary

A deflector control portion in a jet propulsion boat causes a deflector to swing by controlling a deflector drive mechanism in response to an operation of a shift operating portion. The deflector control portion causes the deflector to move to a first trim position when the shift operating portion is switched to a forward movement shift position. The deflector control portion causes the deflector to move to a second trim position when the shift operating portion is switched to an operating shift position.