Elastomeric Ski Dampener with Progressive Contact Surfaces
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Solution Overview
Problem
Conventional snowmobile ski dampeners fail to properly limit ski travel, provide adequate spindle support, or mitigate vibrations effectively, leading to erratic ski response, increased driver fatigue, and premature wear due to their design and material limitations.
Innovation Solution
A snowmobile ski dampener constructed with an elastomeric material featuring a forward preload surface and a forward progressive surface, which increases contact area with the steering spindle as compressive loads rise, controlling the dampening effect and energy absorption while maintaining the material within stress-strain limits, thereby enhancing durability and predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dampener designs are used, then the structure is simple, but the dampening control is poor and ski stability deteriorates
Solution Approach 1:
The dampener employs different surface geometries (preload surface and progressive surface) at different locations to provide different dampening characteristics. The preload surface handles initial contact while the progressive surface engages under higher loads, creating localized functional zones that optimize overall performance without requiring a completely complex redesign
Solution Approach 2:
The dampener transitions from a static contact interface to a dynamic one where the contact area between the dampener and steering spindle base surface changes progressively with applied load. This dynamic adaptation allows the dampener to provide appropriate dampening force across the entire range of motion without requiring multiple components
2Reliability
If conventional dampener materials are used, then manufacturing is easy, but vibration mitigation and durability are insufficient
Solution Approach 1:
The dampener utilizes the elastomeric material's inherent viscoelastic properties and modifies its effective stiffness through geometric design (surface profiles, contact area progression) rather than changing material composition. This allows optimization of vibration mitigation while maintaining ease of manufacturing through standard elastomeric molding processes
Solution Approach 2:
The dampener combines elastomeric material with precisely engineered geometric features (preload surface, progressive surface, contact area variations) to create a composite functional structure that achieves superior vibration mitigation and durability while remaining manufacturable through conventional elastomeric processing
3Reliability
If conventional dampener geometry is used, then manufacturing is simple, but ski travel limitation and spindle support are inadequate
Solution Approach 1:
The dampener employs curved surfaces (preload surface and progressive surface) instead of flat interfaces, allowing the contact area to progress smoothly from a small initial point to a larger area under load. This curvature-based design provides progressive spindle support and ski travel limitation while maintaining relative manufacturing simplicity through mold design
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 improved ski dampener provides a more linear and predictable dampening profile, reducing driver fatigue and extending the component's service life by effectively managing compressive strain and energy absorption, resulting in improved ski stability and reduced wear.
Implementation Method 1
The ski dampener may be constructed of an elastomeric material and include a forward preload surface and a forward progressive surface
Implementation Method 2
The portion of the forward progressive surface in contact with the forward base surface of the steering spindle may increase as increasing compressive loads are applied
Data Source
AI summary
An improved snowmobile ski dampener for dampening articulation between a steering spindle and a snowmobile ski. The ski dampener may be constructed of an elastomeric material and include one or more progressive surfaces that progressively come in contact with a base surface of the steering spindle as progressively increased compressive loads are applied between the steering spindle and snowmobile ski. As the progressive surfaces come in contact with the base surface, the shape factor of the ski dampener may change (e.g., increase), reducing compressive strain for a given compressive stress. Various design and material characteristics including width, shape of the progressive surface, and durometer and bulk modulus of the elastomeric material may be selected to provide various performance characteristics such as dampening effect, impact absorption, approach angle, initial flex force, and service life.