Bevel-Helical Geared Motors (K Series)

Overview

Bevel-Helical Right-Angle Gearboxes

When heavy industrial machinery requires a right-angle drive combined with high mechanical efficiency (> 94%) and immense torque capacity (up to 50,000 Nm), Bevel-Helical (K-Series) gearboxes are the ultimate choice. Nairobi Power Engineers supplies heavy-duty bevel-helical units engineered for the most punishing quarrying, mining, sugar, and cement applications.

Featuring precision ground spiral bevel gears in the first reduction stage followed by hardened helical gear pairs, our K-series reducers eliminate the efficiency losses and overheating associated with heavy worm drives while handling severe cyclic shock loads.

Product Lineup

Equipment & Range Highlights

K-Series • Torque up to 50,000 Nm

Bevel-Helical Right-Angle Reducers (K Series)

Heavy right-angle gear units with solid output shafts, hollow keyed shafts, or shrink disc clamping for shaft-mounted conveyor drives.

Torque Range200 Nm to 50,000 Nm

Efficiency> 94% (High Efficiency Right-Angle)

Ratiosi = 5.3 to 350:1

Motorized Units • Heavy Industry

Bevel-Helical Motorized Drive Assemblies

Complete motorized drive assemblies coupled with IE3 electric motors, backstops, torque arms, and forced lubrication pumps.

Power Rating0.75 kW to 200 kW

BackstopMechanical Sprag Backstop (Optional)

HousingHeavy Ribbed Cast Iron (GG25)

K-Series Specs

Bevel-Helical Gear Unit Reference Table

Gearbox Size	Max Output Torque (Nm)	Ratio Spectrum (i)	Hollow Shaft Bore (mm)
K 37 / K 03	200 Nm	i = 5.3 – 106:1	30 mm Hollow Shaft
K 47 / K 04	400 Nm	i = 5.8 – 131:1	35 mm Hollow Shaft
K 67 / K 06	820 Nm	i = 7.0 – 145:1	40 mm Hollow Shaft
K 77 / K 07	1,550 Nm	i = 7.2 – 190:1	50 mm Hollow Shaft
K 87 / K 08	2,700 Nm	i = 7.0 – 195:1	60 mm Hollow Shaft
K 97 / K 09	4,300 Nm	i = 8.0 – 180:1	70 mm Hollow Shaft
K 127 / K 12	12,000 Nm	i = 8.6 – 170:1	90 mm Hollow Shaft
K 157 / K 15	18,000 Nm	i = 12.0 – 160:1	110 mm Hollow Shaft
K 187 / K 18	50,000 Nm	i = 16.0 – 180:1	120 mm Hollow Shaft

Key Features

Engineering & Build Highlights

Gleason precision ground spiral bevel gears deliver smooth, shock-resistant torque transmission at > 94% efficiency
Heavy ribbed cast iron housing dampens mechanical vibrations and provides massive thermal dissipation capacity
Available with integrated mechanical sprag backstops (one-way clutch) to prevent incline conveyors from running backward
Multiple output mounting options: hollow shaft with keyway, hollow shaft with shrink disc, or double-ended solid shaft
Reinforced spherical roller bearings handle heavy external overhung radial and axial thrust loads
Taconite heavy-duty labyrinth grease seals protect internal gears from abrasive cement and stone dust

Applications

Target Applications & Sectors

Inclined bulk material overland conveyors in mining & quarriesSugar cane shredder, carrier & mill drive systemsCement plant ball mills, clinker coolers & bucket elevatorsHeavy wastewater treatment surface aerators & screw pumpsSteel rolling mills & metal recycling shreddersChemical crystallization reactors & heavy slurry agitators

FAQs

Worm gearboxes generate excessive heat under heavy continuous loads and lose up to 35% of input power in friction. Bevel-Helical gearboxes operate at > 94% efficiency, run much cooler, and handle massive starting shock loads without tooth failure.

A shrink disc is an external mechanical friction clamp that locks the hollow gearbox shaft onto the solid machine shaft without a keyway, eliminating keyway fretting corrosion and making future removal effortless.

Bevel-Helical Geared Motors