Snowmobile Rear Suspension Stop Assembly for Traction Stability

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Solution Overview

Problem

Existing snowmobile suspension systems lack effective mechanisms to limit rear tractive assembly movement, leading to potential instability and reduced traction on snowy and icy surfaces.

Innovation Solution

A rear suspension stop assembly is introduced, comprising a crossmember, cams, brackets, and stops that engage with the cam to prevent rotation of suspension arms, limiting movement and enhancing structural bracing, thereby maintaining traction and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If no suspension stop mechanism is used, then the rear tractive assembly has greater movement freedom, but the snowmobile experiences instability and reduced traction on snowy and icy surfaces

Engineering Contradiction:

Improvesnowmobile stabilityVSAvoidtractive assembly movement freedom

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The suspension stop mechanism changes the movement parameter of the rear tractive assembly by limiting the maximum rotation angle of the suspension arm through the cam-stop interaction, thereby stabilizing the snowmobile while preserving necessary movement freedom within safe limits

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If a suspension stop mechanism is added, then movement is limited and stability is improved, but the device complexity increases

Engineering Contradiction:

Improvesuspension system stabilityVSAvoidsuspension assembly complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The suspension stop mechanism is segmented into distinct functional components (cam, stop, brackets, crossmember) that can be independently manufactured and assembled, reducing overall system complexity while achieving the stability function

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a complex active control system to limit suspension movement, the invention uses a passive mechanical stop that prevents movement beyond a certain point, simplifying the overall system while maintaining stability

Inventive Principle:

Principle #13The other way round (Inversion)

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 rear suspension stop assembly effectively limits movement and enhances traction by preventing excessive rotation of suspension components, ensuring stable operation on uneven terrain.

Implementation Method 1

a cam coupled to the second crossmember... one or more stops configured to engage a portion of the cam to selectively prevent rotation of the arm

Methodology Applied

Scientific EffectCam mechanism: Cam

Data Source

PatentUS20250360975A1Rear suspension stop

Publication Date: 2025.11.27 ARCTIC CAT INC

AI summary

A snowmobile includes a frame and a tractive assembly pivotably coupled to the frame. The tractive assembly includes a first rail, a second rail, a first crossmember extending between the first rail and the second rail, an arm having a first end pivotably coupled to the frame and an opposing second end, and a stop assembly. The stop assembly includes a second crossmember coupled to the arm, a cam coupled to the second crossmember, a first bracket coupled to first ends of the first crossmember and the second crossmember, a second bracket coupled to opposing second ends of the first crossmember and the second crossmember, and one or more stops coupled to at least one of the first bracket or the second bracket, the one or more stops configured to engage a portion of the cam to selectively prevent rotation of the arm.