Planetary Gearbox Cross-Section

Single-stage planetary gearbox, cross-section view along the shaft axis. KINEMATICS - Sun gear: 41 teeth, module 2, pitch diameter 82 mm — INPUT - Planet gears: 29 teeth, pitch diameter 58 mm, 4 planets equally spaced - Ring gear: 99 teeth, internal, tip diameter 194 mm — OUTPUT - Planet carrier: STATIONARY, bolted to housing - Centre distance sun to planet: 70 mm - Gear face width: 50 mm LAYOUT along axis, left to right 1. Output flange for gear coupling 2. Hub, 90 mm diameter, 120 mm long 3. Two deep groove ball bearings on the hub, 90x140x24 mm, seated in the housing bore 4. Cup wall going radially outward to 215 mm diameter 5. Cylindrical cup extending to the right, outer diameter 215 mm 6. Ring gear teeth on the inner surface of the cup 7. Planets meshing with sun and ring 8. Carrier: two plates 15 mm thick either side of the planets, right plate extends outward and bolts to the housing 9. Planet pins 25 mm diameter, needle bearings 25x42x17 10. Sun gear on a 45 mm shaft, NO bearings, floating 11. Shaft exits right through housing wall with a radial shaft seal 12. Splined shaft end for coupling CRITICAL - Items 1 to 6 are ONE single part (the output cup) - The cup passes radially OUTSIDE the carrier plates - Sun shaft and output cup are coaxial but never touch - Sun shaft goes right only, output cup goes left only - Cast housing, 10 mm wall thickness, enclosing everything

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