Planetary gear reducer
A compact gearbox where small gears circle a central gear, trading motor speed for more turning force.
A kind of part, not one product. The robot company does not say which model or whose it is. So there is no single price; the rough figure is what comparable products cost.
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Why this price
Unitree makes its own two-stage planetary gearboxes inside its joint motors and does not sell them, so this is not their price. It is the price of comparable stand-alone planetary gearboxes for small servo motors that a builder can buy, with about 20:1 reduction and 30 to 90 Nm of allowed output torque. They are separate boxes that bolt onto a motor, so they are heavier and longer than a gearbox built into a robot joint, and a precision industrial gearbox costs several times more.
Our own figure, not a price from any company.
Based on: StepperOnline, HTG60-G20 helical planetary gearbox (omc-stepperonline.com)
How to get it
The robot companies do not say who makes this part, so it cannot be ordered as such. Comparable parts you can buy, with their prices, are listed below.
Comparable parts you can buyNot the confirmed part
4 products, scroll sideways
Products on public sale that do the same job, with why each is similar and where to buy it. None is confirmed to be the part inside these robots.
TG Series 60mm 20:1 Planetary Gearbox, TG60-G20
Close matchby StepperOnline
20:1, up to 30 Nm, 15 arcmin backlash, 94% efficient, 60 mm frame, 1.2 kg shipping weight
Why it's similar. A small two-stage style planetary reducer at 20:1, near Unitree's 14.3:1 to 25:1, that takes up to 30 Nm, about the load of a G1 arm or ankle joint. Backlash, the small free play in the gears, is 15 arc minutes or less.
Where to buy
- Global
StepperOnlineUS$46.87Buy
HTG Series 60mm 20:1 Helical Planetary Gearbox, HTG60-G20
Close matchby StepperOnline
20:1, 45 Nm, 90 Nm short bursts, 5 arcmin backlash, 60 mm frame, IP65, 1.79 kg shipping weight
Why it's similar. A tighter, quieter version of the same size of gearbox, with angled gear teeth and 5 arc minutes of backlash, closer to the low play a robot joint needs. It allows 45 Nm, or 90 Nm in short bursts.
Where to buy
- GlobalStepperOnlineUS$100.63Buy
A fuller write-up of this part, with its numbers, price and trade-offs, has not been written yet. How we verify
