Angled Attachment Studs for Snowmobile Skag Weld Strength
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Solution Overview
Problem
Conventional snowmobile skags face issues with shear stress at the weld points due to perpendicular studs, leading to potential detachment and increased cost, along with difficulties in installation and removal due to stud placement and orientation.
Innovation Solution
The skag design features angled studs relative to the rod, distributing shear forces into both shear and upward components, enhancing weld strength and preventing incorrect orientation, with studs angled between 45° and 75°, preferably 65°, to improve durability and accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If studs are attached perpendicular to the rod, then the skag can be secured to the ski, but the welds become the weakest point and may shear away under high shear stress
Solution Approach 1:
The patent changes the orientation parameter of the studs from perpendicular (90 degrees) to angled (45-75 degrees) relative to the rod axis. This parameter change transforms the force distribution at the weld interface, converting pure shear stress into a combination of shear and compressive stresses, thereby strengthening the weld connection and preventing shear failure.
2Ease of operation
If studs are placed close to the ski leg for compact design, then the skag structure is compact, but access to the nut becomes cumbersome and installation/removal is difficult
Solution Approach 1:
The patent introduces asymmetry in the stud placement configuration by angling the studs at 45-75 degrees rather than placing them symmetrically perpendicular to the rod. This asymmetric arrangement naturally positions the nut access points away from the ski leg area, improving accessibility for installation and removal operations while maintaining structural integrity.
3Reliability
If studs are equally spaced over the length of the rod, then the skag can be secured, but there is a possibility of incorrect orientation (backwards installation)
Solution Approach 1:
The patent employs asymmetric stud angling where the studs are oriented at 45-75 degrees relative to the rod axis in a specific directional arrangement. This creates an inherently asymmetric configuration that prevents backwards installation, as the angled studs will not align correctly with the mounting holes when attempted in the wrong orientation, thereby ensuring proper installation without compromising attachment reliability.
Data Source
AI summary
A skag having a rod/elongated rod and rearwardly-angled threaded studs upwardly-extending immovably from the rod. The skag adapted to be connected to the bottom of a snowmobile ski to enhance the steering capabilities the snowmobile ski. The studs being angled with respect to a longitudinal axis of the skag in a direction opposite to that of the forward travel direction of the skag to decrease the shear stress on the weld fixing the stud to the rod and providing a security against installing the skags in the wrong orientation on the bottom of the ski.