Big chain sprocket wheels are generally designed with spokes/arms that are elliptical in cross-section with the major axis being how many times the minor axis?

The design of big chain sprocket wheels with spokes or arms that have an elliptical cross-section is crucial for balancing strength and weight. The ratio of the major axis to the minor axis being 2:1 is an established design principle that allows for effective distribution of stresses and improved rigidity of the sprocket arms.

This ratio helps maintain a balance between the material usage and the required mechanical strength while ensuring that the sprocket connects well with the chain, thus enhancing its efficiency and lifespan.

When the major axis is twice the length of the minor axis, it allows for a streamlined form that reduces material while still providing enough strength to withstand the forces experienced during operation. Such a design also aids in minimizing weight without compromising the performance and durability of the sprocket.

Considering all of these factors, a 2:1 ratio is generally accepted as an effective design choice in the fabrication of elliptical sprocket arms for optimal mechanical performance.