Orbital Gearbox - Prototype reduction drive

Orbital Gearbox

A prototype gearbox design that combines planetary and strain wave gearing to create a multi-material 3D printed reduction drive that is compact while providing very high gear ratios for high torque applications .

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Features

- High positional accuracy with virtually zero backlash - Two-speed compound gearbox design - Capable of being driven by either the sun gear or planet carrier - Modular design made for 3D printing and easy assembly - Quickly experiment with new materials and processes - Custom print profile and STEP files for accurate functional prints - Build plates separated by component and material capability Specifications

- Planetary gearing with ratio of 4:1 - 32 tooth sun gear, planet gears offset by +/- 2 teeth - Strain wave gearing with ratio of 40:1 - 80 tooth flex spline, 82 tooth ring gear - 2 mm flex spline wall thickness - Integrated 2 degree planetary gear bevel allows flex spline to bend more naturally - Outer dimensions: 74 mm x 100 mm x 100 mm - Housing can be mounted with eight M3 screws (49mm radius)

Component

Gear Ratio Driver or Mounting

Input Sun gear

160:1 6 mm hex

Input Planet carrier

40:1 four M3 screws (r = 16mm)

Output Flex spline (cap)

n/a six M3 screws (r = 17.5mm)

Output Flex spline (through-bolt) n/a six M3 screws (r = 24mm)

Assembly

Printed Parts

- Planetary Gears - SunGear.step ( 1x ) - SunGearPost.step ( 1x ) - MajorPlanetGear.step ( 2x ) - MinorPlanetGear.step ( 2x ) - CarrierFront.step ( 1x ) - CarrierBack.step ( 1x ) - CarrierSpacerFront.step ( 1x ) - CarrierSpacerBack.step ( 1x ) - Flex spline - FlexSpline.step ( 1x ) - FlexSplineCore.step ( 1x ) - FlexSplineCap.step ( 1x ) - Housing - HousingBody.step ( 1x ) - HousingCover.step ( 1x ) Hardware

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