Resilient Mounts for Marine Jet Pump Vibration Isolation
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Solution Overview
Problem
Jet propulsion systems in watercraft generate torsional and axial vibrations, causing discomfort to riders and increasing manufacturing costs due to the need for sturdy, separately constructed components.
Innovation Solution
A watercraft design featuring a jet pump assembly mounted on resilient mounts and bumpers, which absorb vibrations and reduce their transmission to the hull and deck, using a combination of resilient materials and metal plates for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the jet pump is rigidly mounted to the hull, then the propulsion system is stable and secure, but vibrations are transmitted to the riders and hull causing discomfort
Solution Approach 1:
The patent introduces resilient mounts as intermediary elements between the jet pump assembly and the hull. These mounts include resilient members that act as mediators to decouple the vibration source from the hull structure, allowing the jet pump to remain securely mounted while preventing vibration transmission to the riders and hull.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating resilient bumpers and resilient mounts that are pre-installed to absorb and dampen vibrations before they can propagate through the hull structure. This proactive vibration isolation prevents the transmission of harmful vibrations to the riders and hull components.
2Strength
If sturdy, separately constructed components are used for the front wall and ride plate, then they can withstand vibrations and support weight, but the manufacturing cost and weight increase
Solution Approach 1:
The patent merges the front wall and ride plate into a single integrated component rather than separate assemblies. This consolidation reduces the number of parts that need to be manufactured and assembled, lowering manufacturing costs and complexity while maintaining the structural strength needed to withstand vibrations and support the watercraft weight.
Solution Approach 2:
The integrated front wall/ride plate component performs multiple functions: it provides structural support for the jet pump assembly, withstands vibrations, supports the watercraft weight, and forms part of the hull structure. This multi-functionality eliminates the need for separate specialized components, reducing manufacturing cost and weight.
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 effectively reduces the transmission of vibrations to riders and the hull, enhancing comfort and potentially lowering manufacturing costs by eliminating the need for rigid, heavy components.
Implementation Method 1
A watercraft design featuring a jet pump assembly mounted on resilient mounts and bumpers, which absorb vibrations and reduce their transmission to the hull and deck
Data Source
AI summary
A watercraft has a hull and a deck disposed above the hull. A ride plate is mounted below a rear portion of the hull. A jet pump assembly includes a jet pump disposed at least in part between the ride plate and the hull. A front wall is formed at least in part by the hull and disposed forwardly of the jet pump. The jet pump assembly is mounted on a top surface of the ride plate via a plurality of resilient mounts At least one sealing member forms a seal between the portion of the jet pump and the portion of the front wall. The jet pump is mounted to the watercraft only via a plurality of mounting points. The jet pump is resiliently mounted to the watercraft via each of the plurality of mounting points.