This visual compares several constant-velocity (CV) and non-CV joints, each optimized for a different engineering tradeoff: • Universal Joint (Hooke’s Joint) Simple and robust, but not constant velocity. As the joint angle increases, output speed oscillates twice per revolution — acceptable for low-speed or paired configurations. • Double Cardan Joint Two U-joints phased together to cancel velocity fluctuation. Common in drivetrains where angular misalignment is unavoidable but smoother rotation is required. • Tripod Joint Uses three trunnions riding in longitudinal tracks. Allows axial plunge (length change), making it ideal for suspension travel in front-wheel-drive systems. • Rzeppa Joint A true constant-velocity joint using balls constrained in a spherical cage. Maintains equal input/output speed even at high angles — critical for steering + power delivery. • Thompson Coupling Employs recirculating ball tracks to transmit torque with minimal backlash and high torsional stiffne...