Zero-backlash class RV reducerFrame 20E
TRV-20E RV Reducer for Robot Joints
- Rated torque
- 167 N·m
- Backlash
- ≤ 1 arcmin
- Ratios
- 57–161:1
from ₹1,12,000 + GST
In stockPrecision gearboxes for robots and automation
RV reducers, harmonic drives, planetary and cycloidal gearboxes with published torque, backlash and CAD for every model. Order online with a GST invoice, or send your motor drawing for a matched flange.
- 2D drawings and STEP files on every product
- Custom input flange for any servo or stepper motor
- Stocked ratios dispatch in 2–3 working days
- Ratios
- 30:1 to 185:1
- Backlash
- ≤ 1 arcmin
- Price from
- ₹1,12,000 + GST
- Ratios
- 30:1 to 160:1 (single stage)
- Backlash
- ≤ 20 arcsec (near zero)
- Price from
- ₹38,500 + GST
- Ratios
- 3:1 to 100:1 (1–2 stages)
- Backlash
- ≤ 3 to 8 arcmin
- Price from
- ₹14,500 + GST
- Ratios
- 11:1 to 119:1 (single stage)
- Backlash
- ≤ 1 arcmin
- Price from
- ₹42,000 + GST
Shop by gearbox type
All gearboxes
RV reducers
Robot base, shoulder and elbow joints, positioners, heavy index tables
Ratios 31–185:1Backlash ≤ 1 arcmin
from ₹1,12,000 + GST2 models
Harmonic drives
Cobot wrists, humanoid joints, hollow-shaft actuators, precision optics
Ratios 30–160:1Backlash ≤ 20 arcsec
from ₹38,500 + GST2 models
Planetary gearboxs
Servo axes, gantries, conveyors, AGV drives, rack-and-pinion
Ratios 3–100:1Backlash ≤ 3–8 arcmin
from ₹14,500 + GST2 models
Cycloidal reducers
Rotary tables, press feeders, palletising robots, heavy-duty joints
Ratios 11–119:1Backlash ≤ 1 arcmin
from ₹42,000 + GST2 models
Ready-to-ship models
All gearboxes
Zero-backlash class 
Zero-backlash class RV reducerFrame 40E
TRV-40E RV Reducer, Heavy-Duty
- Rated torque
- 412 N·m
- Backlash
- ≤ 1 arcmin
- Ratios
- 57–153:1
from ₹1,68,000 + GST
In stock
Zero-backlash class Harmonic driveFrame 17
THD-17 Harmonic Drive Unit, Size 17
- Rated torque
- 21 N·m
- Backlash
- ≤ 20 arcsec
- Ratios
- 30–120:1
from ₹38,500 + GST
In stock
Zero-backlash class Harmonic driveFrame 25
THD-25 Hollow-Shaft Harmonic Drive, Size 25
- Rated torque
- 39 N·m
- Backlash
- ≤ 20 arcsec
- Ratios
- 30–160:1
from ₹56,000 + GST
In stock
Planetary gearboxFrame 60
TQ-PL060 Precision Planetary Gearbox, 60 mm
- Rated torque
- 30 N·m
- Backlash
- ≤ 3 arcmin
- Ratios
- 3–100:1
from ₹14,500 + GST
In stock
Planetary gearboxFrame 90
TQ-PL090 Precision Planetary Gearbox, 90 mm
- Rated torque
- 85 N·m
- Backlash
- ≤ 3 arcmin
- Ratios
- 3–100:1
from ₹21,900 + GST
In stock
Zero-backlash class Cycloidal reducerFrame 80
TCY-80 Precision Cycloidal Reducer
- Rated torque
- 120 N·m
- Backlash
- ≤ 1 arcmin
- Ratios
- 11–87:1
from ₹42,000 + GST
In stock
Zero-backlash class Cycloidal reducerFrame 110
TCY-110 Heavy-Duty Cycloidal Reducer
- Rated torque
- 330 N·m
- Backlash
- ≤ 1 arcmin
- Ratios
- 11–119:1
from ₹64,000 + GST
In stockSize a gearbox from your motor
Enter your motor's rated torque and speed with the ratio you need. We estimate output torque and speed, then show gearboxes rated for it.
Output torque ≈ motor torque × ratio × efficiency. Keep a service factor of 1.5 or more for shock loads and frequent start-stop.
Compare the four gearbox types
Each reduction principle trades stiffness, backlash, size and cost differently. Start with the column that matches your axis.
| Property | RV reducer | Harmonic drive | Planetary gearbox | Cycloidal reducer |
|---|---|---|---|---|
| How it works | A spur planetary first stage drives crankshafts that orbit two cycloid discs inside a pin ring, for very high stiffness. | An elliptical wave generator deforms a thin flexspline so its teeth engage a rigid circular spline two teeth at a time. | A central sun gear drives planets that roll inside a fixed ring gear; the planet carrier is the output. | An eccentric cam wobbles a lobed disc around a ring of pins; the disc turns one lobe per input revolution. |
| Ratio range | 30:1 to 185:1 | 30:1 to 160:1 (single stage) | 3:1 to 100:1 (1–2 stages) | 11:1 to 119:1 (single stage) |
| Backlash | ≤ 1 arcmin | ≤ 20 arcsec (near zero) | ≤ 3 to 8 arcmin | ≤ 1 arcmin |
| Efficiency | 80–90% | 70–85% | 94–97% | 85–92% |
| Stiffness | Very high, high shock load | Moderate | Good | High, tolerates shock loads |
| Torque density | Very high | Very high, lightest | High | High |
| Best for | Robot base, shoulder and elbow joints, positioners, heavy index tables | Cobot wrists, humanoid joints, hollow-shaft actuators, precision optics | Servo axes, gantries, conveyors, AGV drives, rack-and-pinion | Rotary tables, press feeders, palletising robots, heavy-duty joints |
| Price from | ₹1,12,000 + GST | ₹38,500 + GST | ₹14,500 + GST | ₹42,000 + GST |
Shaft sizes do not match? We make the coupling
Every gearbox can be joined to any motor, robot joint or housing: we machine a custom coupling bored to both shafts, plus an adapter flange if the mounting faces differ. Send both shaft sizes, a drawing or just the motor model number.
Get a custom coupling- Send your requirementMotor model, shaft and pilot sizes, or a STEP/PDF drawing.
- We confirm the designA 2D drawing and quote from our engineers within 48 working hours.
- We machine and assembleCoupling, flange or housing is fitted and tested with the gearbox before dispatch.
Not sure which type fits your axis?
Open the gearbox simulator to see how each type gets its ratio and what output speed and torque it gives with your motor, or ask an engineer to size it for you.
What comes with every order
- Sizing supportAn engineer checks ratio, torque and mounting against your motor before dispatch.
- Drawings2D dimension drawing and 3D STEP model, before and after you buy.
- GST tax invoiceWith HSN code, so registered businesses can claim input credit.
- Matched mountingInput flange, coupling and bolts for the motor you ordered it for.
From our engineers
All guides and applicationsGearbox service life calculation: average torque, average speed and rated life
How precision reducer life is rated, how to reduce a duty cycle to average torque and speed, and two worked life calculations for an RV reducer and a…
Gear ratio formulas for planetary, cycloidal, harmonic and RV reducers
The ratio formula for each precision reducer type, tooth-count tables for standard ratios, and how to get output speed and torque, with worked exampl…
Mounting a servo or stepper motor to a gearbox: flange dimensions and coupling guide
The four dimensions that fit any motor to any gearbox, reference tables for NEMA 17, 23 and 34 steppers and common servo frames, and how clamping hub…
Common questions
Which gearbox type should I choose for a robot joint?
For base, shoulder and elbow joints of industrial arms, RV reducers give the highest stiffness and shock capacity. For lightweight cobot and humanoid joints, harmonic drives give near-zero backlash in the smallest package. Planetary gearboxes suit servo linear axes and wheels, and cycloidal reducers suit rotary tables and heavy indexing.
How do I order a gearbox online?
Choose the gearbox type, open a model, pick the ratio and quantity and add it to the cart. Checkout asks for your delivery address and GSTIN, and you pay online. Add a note or upload your motor drawing if you need a matched flange.
Can you make a flange to fit my servo motor?
Yes. Every gearbox can ship with a custom input flange and coupling machined for your motor. Share the motor model or the pilot diameter, bolt circle and shaft size, and we send a drawing and quote within 48 working hours.
Are prices inclusive of GST?
Listed prices exclude GST. GST (18% for gearboxes, HSN 8483) is added at checkout and shown on the tax invoice, so GST-registered buyers can claim input credit.
Do you provide 2D drawings and 3D CAD models?
Yes. Each product page has downloadable 2D dimension drawings and 3D STEP models where available, so you can check fit before ordering.
What is the lead time?
Stocked ratios dispatch in 2–3 working days. Made-to-order ratios and custom flanges or housings usually take 2–4 weeks depending on quantity and machining.