Snowmobile Rear Suspension Toggle Link Dynamics
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Solution Overview
Problem
Current snowmobile suspension systems, particularly the rear suspension, face challenges in providing optimal ride comfort and shock absorption on uneven terrain, which affects the overall performance and comfort of the ride.
Innovation Solution
The snowmobile design incorporates a rear suspension system with a toggle link pivotally coupled to the tunnel, a rear control arm between the slide rails and the toggle link, and a front control arm between the slide rails and the tunnel, allowing for adjustable dynamics through a movable carrier roller, which enhances propulsion and cornering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional rear suspension system with slide rails and shock absorbers is used, then the snowmobile can provide basic shock absorption, but the ride comfort and sensitivity on uneven terrain are insufficient
Solution Approach 1:
The patent applies the dynamics principle by making the carrier roller movable along the toggle link rather than fixed. This allows the suspension system to dynamically adjust its characteristics during operation, enabling the system to adapt to varying terrain conditions and optimize both ride comfort and sensitivity response without requiring multiple complex suspension systems.
2Ease of manufacture
If the shock absorber is mounted in a forward position, then the suspension geometry is simplified, but the vehicle stability and cornering performance are reduced
Solution Approach 1:
The patent applies the dimensionality change principle by repositioning the shock absorber mounting to the rearward portion of the toggle link, which is a different spatial location than conventional designs. This rearward positioning improves vehicle stability and cornering performance by altering the suspension geometry and weight distribution, while the toggle link mechanism itself maintains manufacturing feasibility through its pivotally coupled design.
3Productivity
If the carrier roller is fixed in position on the toggle link, then the suspension structure is simpler, but the propulsion and cornering capabilities cannot be optimized
Solution Approach 1:
The patent applies the dynamics principle by making the carrier roller movable along the toggle link rather than fixed. This allows the suspension system to dynamically adjust its characteristics during operation, enabling the system to adapt to varying terrain conditions and optimize both ride comfort and sensitivity response without requiring multiple complex suspension systems.
4Device complexity
If the exhaust outlet projects forwardly, then the exhaust system is simpler to design, but it interferes with the steering post and frame members
Solution Approach 1:
The patent applies the inversion principle by reversing the conventional exhaust outlet orientation. Instead of projecting forwardly as is typical, the exhaust outlet projects rearwardly between the steering post and frame members. This inverted configuration eliminates interference with steering components while maintaining exhaust system functionality, and the vertical projection upwardly accommodates the reversed orientation.
Data Source
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AI summary
A snowmobile (2) has an engine (10) mounted with an exhaust port facing forwardly. A steering post (82) extends substantially along a longitudinal centerline of the vehicle and over a top of the engine. An exhaust outlet (204, 206) is coupled to exhaust port and projects vertically upwardly to a position higher than the engine, and projecting rearwardly between the steering post and frame members. The rider position is re-defined relative to the snowmobile center of gravity.