Hub gears for dummies
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This document provides an overview of the internal components and operation of a 3-speed Sturmey Archer hub gear system. It details the planetary gearing setup involving a sun gear, planet cage with 4 planets, gear ring, and hub. It explains how in 3rd gear, the clutch engages the planet axles to drive the gear ring and hub faster than the driver. In 2nd gear, the clutch disengages from the planets and drives the gear ring and hub at the same speed as the driver. In 1st gear, the clutch blocks the gear ring pawl to cause the planet cage to drive the hub slower than the driver via the gear ring.
Hub gears for dummies
- 1. Hub gears for dummiesSturmey Archer 3 Speed HubTechnological design Engineering Alexandre De Bie
- 2. Whats InsideTechnological design Engineering Alexandre De Bie
- 3. Technological design Engineering Alexandre De BieDriver and sprocket
- 4. Technological design Engineering Alexandre De Bie
- 5. Technological design Engineering Alexandre De BiePlanetary GearingHub
- 6. Hub (Wheel)Technological design Engineering Alexandre De BieHub Teeth
- 7. Planetary GearingTechnological design Engineering Alexandre De BieGear ring4 planetsSun (Fix)Section
- 8. Axle and Sun gearTechnological design Engineering Alexandre De BieSun gearAxle
- 9. Planet Cage with PlanetsTechnological design Engineering Alexandre De Bie4 Planet axles4 Planets2 Planet cage pawlCage
- 10. Gear ringTechnological design Engineering Alexandre De BieBottom View4 Tabs2 PawlsGear ring teeth
- 11. Sprocket - Planetary gearing connectionTechnological design Engineering Alexandre De BieClutchSprocketPlanet axle
- 12. Planetery gearing Hub ConnectionTechnological design Engineering Alexandre De BieGear ring pawlCage pawlHub teeth
- 13. Technological design Engineering Alexandre De BieChoosing the speed 3rd SpeedSpring Force2nd Speed1st Speed
- 14. 3rd speed (High)Technological design Engineering Alexandre De BieHow it worksClutch rest against planet axle
- 15. Technological design Engineering Alexandre De BieDriver drives the planet cagePlanet cage drives the gear ring. 90属120属Cage rotates 90属Gear ring 120属Cage rotates 3 timesGear ring rotates 4 timesHub drives as fast as gear ringMake 3 rotation with the driverto make 4 rotations with the wheelGear ring connectedto hub with pawl
- 16. 2ndSpeed (Normal)Technological design Engineering Alexandre De BieClutch rest against tabs from the gear ringContact with cage lost
- 17. Technological design Engineering Alexandre De BieDriver drives the gear ringHub drives as fast as gear ringMake 1 rotation with the driver to rotate the hub 1 timeGear ring connectedto hub with pawl
- 18. 1stSpeed (Low)Technological design Engineering Alexandre De BieAs in the 2nd speed no contact with the cageClutch rest against tabs from the gear ringAnd blocks the gear ring pawls
- 19. Technological design Engineering Alexandre De Bie2nd Speed pawl not blocked1stSpeed clutch blocks pawlGear ring is unable to grab in the hub teeth
- 20. Technological design Engineering Alexandre De BieDriver drives the gear ringGear ring drives the planet cage 120属90属Gear ring 120属Cage rotates 90属Gear ring rotates 4 timesCage rotates 3 timesHub drives as fast planet cageMake 4 rotation with the driverto make 3 rotations with the wheelPlanet Cage connectedto hub with pawl
- 21. Technological design Engineering Alexandre De Bie