Orbital Gearbox - Prototype reduction drive design

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Orbital Gearbox - Prototype reduction drive design

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17
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5

Print Profile(1)

All
X1 Carbon
P1S
P1P
X1
X1E
A1

All parts (0.2mm layer, 3 walls, 25% infill)
All parts (0.2mm layer, 3 walls, 25% infill)
Designer
15 h
4 plates

Boost
17
19
5
1
22
4
Released

Description

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.

 

 

If you would like to support this project you can boost this model to help fund further development and testing. Any support is greatly appreciated!

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)

OutputFlex 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

  • M3x16mm Socket Head Cap Screw (1 pcs)
  • M3x20mm Socket Head Cap Screw (6 pcs)
  • M3x35mm Socket Head Cap Screw (12 pcs)
  • MR106-2RS Deep Groove Ball Bearings 6mm x 10mm x 3mm (8 pcs)
  • 608-2RS Ball Bearings 8mm x 22mm x 7mm (2 pcs)
  • 6806-2RS Deep Groove Ball Bearings 30mm x 42mm x 7mm (1 pcs)
  • 6812-2RS Deep Groove Ball Bearings 60mm x 78mm x 10mm (2 pcs)

Instructions

Comment & Rating (5)

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Nice design: but have you seen 3d printed bearings? You might be able to pull this one off as fully 3d printed!
The designer has replied
1
Reply
Thank you, I have seen them and it's one of the things I'd like to try. This model is designed to be a prototype that I can use to test the limits of materials and printed parts but one of my main goals is to reduce the cost, size and weight of the overall design.
0
Reply
Looks neat. Whats it for
1
Reply
Torque. All of it.
2
Reply
would be possible a tiny version? very good design!
0
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No more