Helical Gear Mechanism Diagram - Engineering Illustration #1261271 (License: Personal Use)

This black-and-white engineering illustration depicts two helical gears engaged at an angle, with clearly rendered involute teeth, central shafts, and a hexagonal bolt head securing the upper gear. Shading and linework emphasize depth, rotation direction, and mechanical fit, typical of vintage machinery schematics or instructional manuals. The design conveys load distribution advantages of helical over spur gears.

Used in mechanical engineering textbooks, online courses, technical blogs, or product documentation to explain gear systems, torque transmission, or CAD modeling fundamentals; targets students, designers, and hobbyists seeking visual understanding of gear mechanics.