Snowmobile Ice Scratcher Hook Design for Engine Cooling
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Solution Overview
Problem
Conventional ice scratchers on snowmobiles are prone to deformation when reversing, leading to reduced effectiveness in generating ice/snow spray for engine cooling and track lubrication, especially on hard-packed snow or ice surfaces.
Innovation Solution
A wire ice scratcher design with a coiled spring portion and a leg portion that forms a hook shape, featuring a flattened end with a forward, inward, and downward angulation, which enhances disruption and directional control of ice/snow, resisting deformation and improving spray delivery to the heat exchanger and track.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional wire ice scratchers are used with downwardly directed configuration, then they can scratch ice surface, but they generate evenly dispersed spray that does not effectively reach the heat exchanger and provide insufficient cooling
Solution Approach 1:
The ice scratcher transitions from a symmetric downwardly directed wire to an asymmetric configuration with a laterally extending coiled spring portion and an angled leg portion that directs spray inwardly toward the heat exchanger. This asymmetric design creates directional control, focusing the ice/snow spray where it is needed for effective cooling rather than dispersing it uniformly.
Solution Approach 2:
The invention adds a lateral dimension to the ice scratcher by extending the coiled spring portion outwardly from the snowmobile centerline and angling the leg portion inwardly. This multi-dimensional configuration (lateral extension + angular inclination) redirects the spray trajectory from purely downward to inwardly directed, enabling the spray to reach the heat exchanger effectively.
2Adaptability or versatility
If conventional wire ice scratchers are used in reverse direction, then the snowmobile can travel backward, but the wire form suffers permanent deformation and loses effectiveness
Solution Approach 1:
The ice scratcher incorporates a coiled spring portion that provides dynamic flexibility, allowing the structure to flex and return to its original position after being subjected to forces in either forward or reverse directions. This dynamic characteristic enables the scratcher to withstand bidirectional operation without permanent deformation, maintaining both versatility and reliability.
Solution Approach 2:
The wire form is configured with a flexible coiled spring portion that can elastically deform under load and recover its original shape. This flexibility allows the ice scratcher to operate reliably in both forward and reverse directions without suffering permanent structural damage, as the spring portion absorbs and dissipates the mechanical stresses encountered during bidirectional travel.
3Temperature
If conventional ice scratchers simply scratch the top surface of hardpack snow, then they can engage the surface, but they generate insufficient spray volume and height to effectively cool the heat exchanger
Solution Approach 1:
The ice scratcher's leg portion is angled forwardly and inwardly to dig into and fracture the hardpack snow surface before the snowmobile's motion can carry the scratcher away. This preliminary fracturing action creates a larger volume of ice/snow particles that are then directed inwardly toward the heat exchanger, significantly increasing the cooling effectiveness compared to simple surface scratching.
Solution Approach 2:
The ice scratcher combines a resilient coiled spring portion with a rigid leg portion that has a flattened end. This composite structure allows the leg to effectively fracture hard snow/ice surfaces while the spring portion provides flexibility and directional control, creating a system that generates both high-volume spray and maintains structural integrity during operation.
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 enhanced design provides increased and directed ice/snow spray to the heat exchanger and track, improving cooling and lubrication efficiency while maintaining structural integrity during both forward and reverse operations.
Implementation Method 1
a wire form having a coiled spring portion and a leg portion extending downwardly from the coiled spring portion
Implementation Method 2
A feature and advantage is the configuration provides a hook shape that provided an enhanced disruption of the snow/ice generating a cloud of ice snow
Data Source
AI summary
A snowmobile ice scratcher has a wire form in the shape of a hook secured to a track frame of the snowmobile. The wire form has a coil portion at the track frame and a downwardly extending leg portion that in an undeflected position has an elongate snow/ice spray generating portion configured as a flattened wire segment portion oriented downwardly, forwardly, and inwardly for generating snow/ice spray on hard packed snow and/or ice surfaces. An upwardly facing flat surface of the elongate snow/ice spray generating portion faces upwardly, inwardly, and forwardly and creates an ice/snow spray as the snowmobile is moving forward that is primarily directed inwardly to provide improved lubrication of the track assembly and improved deposition of ice/snow spray under the tunnel on a heat exchanger, thereby providing improved cooling of the snowmobile engine. The hook shape of the leg portion allows rearward operation of the snowmobile without damage to the ice scratcher.