Jet Propulsion Trim and Reverse Gate Integration
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Solution Overview
Problem
The complexity and cost associated with independent mechanisms and actuation systems for variable trim systems (VTS) and reverse gates in jet propulsion systems lead to increased complexity and space constraints in watercraft.
Innovation Solution
Integration of a rotary actuator that rotates the VTS support and reverse gate together, allowing the reverse gate to move from a stowed position to a position redirecting the jet of water when the steering nozzle is in a trim down position, eliminating the need for separate mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate mechanisms and actuation systems are provided for VTS and reverse gate, then both functions can be independently controlled, but device complexity and cost increase
Solution Approach 1:
The patent combines the VTS support and reverse gate into a single integrated assembly that rotates together as one unit. The rotary actuator operates this combined assembly, eliminating the need for separate actuation systems. This merging reduces device complexity and cost while maintaining both trim control and reverse gate functionality through coordinated operation of the integrated components.
2Adaptability or versatility
If separate mechanisms are provided for VTS and reverse gate, then both functions can be independently controlled, but space requirements increase
Solution Approach 1:
The VTS support and reverse gate are merged into a single rotating assembly, significantly reducing the space required in the jet propulsion system. The integrated design allows both trim adjustment and reverse gate operation to be achieved within a compact configuration, eliminating the need for separate mechanical components and their associated actuation systems.
3Device complexity
If a single rotary actuator controls both VTS support and reverse gate, then device complexity is reduced, but the reverse gate can only operate when steering nozzle is in trim down position
Solution Approach 1:
The system requires the steering nozzle to be in the trim down position before the reverse gate can be activated. This preliminary positioning of the steering nozzle enables the integrated assembly to rotate to the reverse gate position. The design embeds this sequence requirement into the mechanical configuration, ensuring proper operation while maintaining system simplicity.
Data Source
AI summary
A watercraft has a jet pump and a venturi. A variable trim system (VTS) support and a reverse gate are rotationally mounted relative to the venturi. A steering nozzle is rotationally mounted to the VTS support. A rotary actuator has an output portion operatively connected to at least one of the VTS support and the reverse gate. Rotation of the output portion between a first angle and a second angle causes a rotation of the VTS support while the reverse gate remains in a stowed position relative to the steering nozzle. Rotation of the output portion between the second angle and a third angle causes a rotation of the reverse gate between the stowed position and a second position while the VTS support remains in a fixed position. A jet propulsion system and a method of operating a jet propulsion system are also disclosed.