Parametric Design and Motion Simulation of a Portable Wheel Nut Remover with a Three Stage Planetary Transmission
Tiandi Liang *
North China University of Water Resources and Electric Power, Zhengzhou, Henan Province, China.
*Author to whom correspondence should be addressed.
Abstract
Wheel-nut removal away from a workshop requires torque amplification without an external power supply. This study presents a parametric design and kinematic assessment of a manually operated portable wheel-nut remover with three serial fixed-ring planetary stages. Sun, planet and ring tooth counts of 11, 10 and 31 give a calculated overall reduction ratio of 55.66. The preliminary output sizing target is 7500 N·m, whereas the available numerically driven simulation records indicate approximately 10 N·m input and 557 N·m output over a plotted interval of approximately 10 s. These are distinct load cases, and the lower-load simulation does not validate the sizing target. The reported CAD assembly mass is approximately 5.337 kg. Tooth-count compatibility and ideal torque transfer are verified analytically, while the recorded torque ratio provides only a consistency check against the ideal reduction ratio, not a measured efficiency. The original strength inputs and safety factors are internally inconsistent and cannot support a load rating. The first-stage manufacturing geometry, actual tooth-profile parameters and complete simulation settings remain unverified. The results therefore support the kinematic arrangement within the stated assumptions, rather than a validated physical tool. A consistent strength reassessment, complete geometry verification and prototype testing are required before assigning a permissible operating torque, efficiency or fatigue life.
Keywords: Portable wheel-nut remover, planetary transmission, torque amplification, parametric design, virtual assembly, motion simulation