Jet Propelled Watercraft Reverse Gate Malfunction Control
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Solution Overview
Problem
Existing jet propelled watercrafts face issues when the electrically driven reverse mechanism malfunctions, as the reverse gate can block the water jet, preventing efficient forward movement and smooth navigation.
Innovation Solution
A jet propelled watercraft with a reverse gate moving mechanism, an electric motor, a transmitting mechanism, and a withdrawal controller that detects malfunctions and ensures the reverse gate is reliably withdrawn to the forward drive position, allowing for uninterrupted forward movement even when the reverse gate moving mechanism fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the reverse gate moving mechanism is electrically driven to enable precise control of the reverse gate position, then the ease of operation is improved, but the reliability deteriorates due to potential electrical system malfunctions
Solution Approach 1:
A releasing mechanism is introduced as an intermediary between the reverse gate moving mechanism and the reverse gate. This mechanism includes a locking member that can engage with a locking portion on the reverse gate, allowing the gate to be held in position without continuous electrical power, and can be manually released when electrical systems fail.
Solution Approach 2:
The system is divided into two independent subsystems: the electrically driven reverse gate moving mechanism for normal operation, and the mechanical releasing mechanism with locking member for emergency situations. This segmentation ensures that failure in one subsystem does not completely disable the other.
2Adaptability or versatility
If the reverse gate is positioned to cover the jet port for reverse driving, then the adaptability is improved, but the productivity deteriorates when malfunction occurs as forward movement is blocked
Solution Approach 1:
The releasing mechanism is pre-configured with the locking member positioned to automatically engage with the reverse gate's locking portion when the gate moves into the forward position. This preliminary arrangement ensures that if the electrical system fails, the gate can be quickly released and moved to the forward position without complex manual intervention, maintaining productivity during emergencies.
3Manufacturing precision
If the transmitting mechanism is made complex to enable precise power transmission to the reverse gate, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The complex transmitting mechanism is extracted from the emergency release function. The releasing mechanism uses a simple mechanical locking member that engages with a locking portion on the reverse gate, independent of the complex electrical transmitting mechanism. This allows the transmitting mechanism to focus on precision power transmission while the releasing mechanism handles emergency situations with simple mechanical components.
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
Enables reliable forward movement and safe return to port by ensuring the reverse gate is always in the forward drive position, regardless of the malfunction's location in the reverse gate moving mechanism, thus overcoming the limitations of existing technologies.
Implementation Method 1
a reverse gate moving mechanism that includes an electric motor that generates power to move the reverse gate between a reverse drive position and a forward drive position
Implementation Method 2
a jet pump that jets water rearward from a jet port
Implementation Method 3
In a state of being positioned at the reverse drive position, the reverse gate guides forward the water that has been guided to the jet port
Data Source
AI summary
A jet propelled watercraft includes a jet pump that jets water rearward from a jet port, a reverse gate, a reverse gate moving mechanism, and a withdrawal controller. The reverse gate is movable in an up/down direction between a reverse drive position at which an entirety of the jet port is covered and a forward drive position at which the entirety of the jet port is open. In a state of being positioned at the reverse drive position, the reverse gate guides forward the water that has been guided to the jet port. The reverse gate moving mechanism includes an electric motor that generates power to move the reverse gate between the reverse drive position and the forward drive position, and a transmitting mechanism that connects the electric motor and the reverse gate. The withdrawal controller monitors malfunctions of the reverse gate moving mechanism.