Snowmobile Rear Suspension Idler Layout for Reverse Climbing
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Solution Overview
Problem
Snowmobiles face challenges in maintaining optimal performance in both forward and reverse directions, particularly in terms of towing function and ground contact, due to the biasing of rear idler wheels which reduce ground contact area when operating forward.
Innovation Solution
A rear suspension assembly with a configuration that includes center and rear idler wheels positioned at angles relative to a defined plane, allowing automatic adjustment to maintain ground contact and optimize performance in both directions without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rear idler wheel is biased upward with a spring to increase reverse climbing ability, then the snowmobile's ability to climb over snow and obstacles in reverse is improved, but the track loses surface area in contact with the ground when operating forward, decreasing towing function
Solution Approach 1:
The rear idler wheel assembly is made dynamically adjustable through a linkage mechanism connected to the track tensioning system. The linkage allows the rear idler wheel to pivot between a first position (angled upward) for reverse climbing and a second position (lowered) for forward towing, enabling the system to adapt its configuration based on operating direction
Solution Approach 2:
The system automatically adjusts the rear idler wheel position based on track tension conditions without manual intervention. When the track is tensioned for forward operation, the linkage automatically lowers the rear idler wheel to maximize ground contact; when reverse climbing is needed, the system self-adjusts to the angled position
2Adaptability or versatility
If a mechanism is provided for manually raising the rear idler wheel for reverse operation, then the ability to climb over obstacles in reverse is improved, but manual actuation is required when operating modes are changed, reducing ease of function
Solution Approach 1:
The linkage mechanism automatically adjusts the rear idler wheel position based on track tension conditions without manual intervention. When the track is tensioned for forward operation, the linkage automatically lowers the rear idler wheel to maximize ground contact; when reverse climbing is needed, the system self-adjusts to the angled position
Solution Approach 2:
The system uses track tension as feedback to automatically control rear idler wheel position. The linkage mechanism responds to changes in track tension caused by direction changes, automatically positioning the rear idler wheel optimally for the current operating mode without requiring operator input
Data Source
AI summary
A snowmobile extends along a longitudinal axis and includes a frame, a powertrain coupled to the frame and a track operatively coupled to the powertrain, the track having an upper run and a lower run. The snowmobile includes a rear suspension having at least one slide rail having a hyfax defining a plane, at least one front idler wheel in contact with the lower run of the track, at least one center idler wheel positioned adjacent the at least one front idler wheel, and at least one rear idler wheel positioned adjacent the at least one center idler wheel, and wherein the positioning of the at least center idler wheel is configured such that the at least one rear idler wheel is positioned at an angle relative to the plane having a value that is greater than zero.