Conical Mount Radial Snubber Rotation
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Solution Overview
Problem
Conventional engine mounts experience rubber wear due to tangential friction forces exceeding the snubber's capacity, causing the snubber to shift within the housing and resulting in wear.
Innovation Solution
A conical engine mount design featuring a radial snubber on a rotating bearing assembly that allows free rotation about the upper metal component, minimizing tangential loads through the use of a low-friction ring or ball bearings within machined grooves, preventing axial translation and maintaining compressive strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the snubber is radially fixed relative to the upper metal portion, then the structure is simple, but the tangential friction force causes rubber wear and reduces reliability
Solution Approach 1:
The patent transforms the static, radially fixed snubber into a dynamic system where the snubber can rotate about the upper metal portion. This rotation allows the snubber to accommodate tangential forces from prop thrust without generating excessive friction, thereby reducing rubber wear and improving reliability while maintaining structural simplicity
Solution Approach 2:
The patent introduces a bearing assembly as an intermediary component between the snubber and the upper metal portion. This bearing enables smooth rotation and reduces friction, allowing the snubber to handle tangential loads effectively without direct frictional contact that would cause wear
2Force
If the snubber is forced across the housing due to prop thrust force, then the mount can handle engine torque, but the snubber experiences excessive friction and wear
Solution Approach 1:
The patent enables the snubber to rotate dynamically about the upper metal portion, transforming the sliding friction problem into a rolling or pivoting motion. This dynamic capability allows the mount to handle engine torque reactions while minimizing tangential friction forces that cause wear
Solution Approach 2:
The bearing assembly acts as a mediator between the snubber and housing, reducing the harmful friction force by providing a low-friction interface that allows the snubber to rotate freely while still transmitting the necessary force reactions
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
Reduces rubber wear by minimizing tangential loads on the radial snubber, allowing it to remain in compressive strain rather than shear strain, effectively reducing friction and wear when subjected to engine torque and prop thrust forces.
Implementation Method 1
A compression force on the snubber reacts against the engine torque. When coupled with a prop thrust force that exceeds a tangential friction force of the snubber, the snubber is forced across the housing, causing rubber wear.
Implementation Method 2
a bearing assembly coupled with the radial snubber and positioned between the radial snubber and the upper metal portion. The bearing assembly enables the radial snubber to rotate freely about the upper metal portion
Implementation Method 3
a main rubber element coupled to the base member and enclosed within the housing. The main rubber element is positioned between the base member and upper metal portion
Data Source
AI summary
A conical mount includes a housing defining an axis of rotation, a base member enclosed within the housing, a main rubber element coupled to the base member and enclosed within the housing, an upper metal portion positioned within the housing such that the main rubber element is positioned between the base member and upper metal portion, a radial snubber extending circumferentially around the upper metal portion, and a bearing assembly coupled with the radial snubber and positioned between the radial snubber and the upper metal portion. The bearing assembly enables the radial snubber to rotate freely about the axis of rotation to reduce a tangential load on the radial snubber.