Coaxial Inline Helical Geared Motors

Overview

Inline Helical Geared Motors

For industrial applications requiring high mechanical efficiency, continuous heavy-duty operation, and coaxial alignment, Inline Helical Geared Motors are the premier solution. Nairobi Power Engineers stocks and assembles modular helical gear units from 0.12 kW to 160 kW with output torque up to 18,000 Nm.

Featuring case-hardened helical gear pairs with ground tooth profiles, single-piece rigid cast iron housings, and normalized IEC B5/B14 motor input flanges, our helical gear units operate silently with over 96% efficiency across 2-stage and 3-stage reductions.

Product Lineup

Equipment & Range Highlights

Coaxial Inline • 2-Stage / 3-Stage

Foot & Flange Mounted Helical Gear Units

Modular inline helical speed reducers with foot mounting (B3) or output flange (B5) with output speeds from 5 RPM to 700 RPM.

Torque80 Nm to 18,000 Nm

Ratio Rangei = 1.3 to 280:1

Efficiency> 96% Full Load

IE3 Integrated • Motorized

Direct-Coupled IE3 Helical Motor Units

Integrated geared motors direct-coupled with IE3 Premium Efficiency electric motors for maximum energy savings on continuous processing plant.

Motor Power0.37 kW to 90 kW

ProtectionIP55 / IP65 Class F

LubricationSynthetic ISO VG 220

Helical Specs

Helical Gear Unit Technical Reference

Gearbox Model	Max Output Torque (Nm)	Ratio Spectrum (i)	Output Shaft Diameter (mm)
RC 01 / R 37	200 Nm	i = 3.4 – 135:1	25 mm Solid Shaft
RC 02 / R 57	450 Nm	i = 4.3 – 180:1	35 mm Solid Shaft
RC 03 / R 77	820 Nm	i = 4.0 – 210:1	40 mm Solid Shaft
RC 04 / R 87	1,550 Nm	i = 5.2 – 250:1	50 mm Solid Shaft
RC 05 / R 97	3,000 Nm	i = 4.5 – 280:1	60 mm Solid Shaft
RC 06 / R 107	4,300 Nm	i = 4.0 – 280:1	70 mm Solid Shaft
RC 08 / R 147	13,000 Nm	i = 5.0 – 250:1	90 mm Solid Shaft

Key Features

Engineering & Build Highlights

Helical gear tooth geometry provides continuous rolling contact for whisper-quiet operation under heavy load
Single-piece monobloc cast iron housing (GG20/GG25) guarantees precise gear alignment and high rigidity
Hardened and profile-ground teeth (DIN 3962 Class 6) minimize friction losses and eliminate gear wear
High overhung load (OHL) radial capacity on the output shaft accommodates heavy chain and belt drives
Universal mounting: reversible casing with mounting feet on bottom, top, or sides plus B5 output flanges
Supplied with oil level sight glass, breather plug, and magnetic oil drain plug

Applications

Target Applications & Sectors

Heavy industrial belt conveyors & bucket elevatorsAgro-processing grain cleaning & flour milling siftersWater treatment rotary clarifiers & aerator drivesPackaging lines, bottling conveyors & palletizersChemical mixing tanks & liquid agitatorsQuarry stone crushing conveyors & feeders

FAQs

Helical gears transmit torque through rolling contact between tooth flanks (resulting in 98% efficiency per stage), whereas worm gears transmit power through sliding friction (resulting in 65-80% efficiency and generating more heat).

When filled with premium synthetic polyalphaolefin (PAO) gear oil (ISO VG 220), oil changes are required only every 15,000 to 20,000 operating hours (approx. 3 to 4 years of continuous industrial duty).

Helical Geared Motors