Helical and Spur Gear Assembly Diagram - Engineering Illustration #1261306 (License: Personal Use)

This technical line drawing depicts a helical gear engaging with a spur gear, emphasizing precise tooth profiles, helix angles, and cross-sectional details using hatching and dotted lines. The illustration demonstrates gear meshing principles, shaft alignment, and internal bore features critical for mechanical transmission design. It serves as an educational and reference tool for understanding gear kinematics and manufacturing tolerances.

Used in mechanical engineering textbooks, online courses, technical manuals, and CAD/FEA documentation to explain gear systems; matches user intent for learning gear mechanics, designing power transmission systems, or troubleshooting gear wear and misalignment.