wheelchair gear system 3d model

Mechanical engineering CAD model of a wheelchair gear reduction system for ramp climbing. Mounted beside a standard 24-inch wheelchair wheel. Three spur gears: input gear with 20 teeth connected to the handrim, intermediate idler gear with 20 teeth, output gear with 60 teeth fixed to the wheel hub. Two-speed selector mechanism with direct drive (1:1) and reduced drive (1:3). Exposed gears mounted on a machined aluminum frame with steel shafts, bearings, selector lever, locking pin and support brackets. Realistic engineering assembly, detailed gear teeth, exploded mechanical design, industrial prototype, SolidWorks style, high precision CAD rendering, photorealistic materials, engineering visualization.