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Gear Couplings
MAINA is the leading company for Gear couplings production in Italy. It is the preferred supplier for Steel & Aluminum plants for VOEST ALPIN industries (VAI). MAINA gear couplings are manufactured from forged steel ingots, machined and heat-treated. Gear couplings are of different types of steel - AISI 1045, AISI 4140, Nitralloy N/135/135M - these are hardened and tempered before being machined. To increase the load capacity, in some types of couplings, the gear teeth can be surface hardened after machining by thermal or thermo-chemical treatments and, when required they can be ground. Main treatments are induction tempering, nitroxidation and gas nitriding.
 
Types of Gear Couplings
Floating Shaft
Shear Pin Coupling
Flexible Coupling
Spacer Coupling
Gear Spindles for Rolling Mills
Maina’s Gear Spindles meet today’s extreme operating requirements for high misalignment and torque by means of the following features:
Gear Tooth profile, designed for each application, obtains a maximum area contact with minimum backlash and stress concentration.
Selection of material, heat treatment and surface hardening ensure that MAINA gear spindle endure combined compressive, bending and shear stresses.
Surface finish precision of the gear tooth improve the load distribution and increase the working surface.
Special sealing set avoids leakage of lubricant and contamination maintaining the lube film, essential for a long tooth life.
Precise manufacturing and exact balancing assure optimum life and performance, for high-speed operations.
 
 
 
   
Universal Shafts
Maina’s Universal shafts perform better as compared to their counterparts of the same size. Moreover, the maintenance intervals have been increased accordingly. A number of steel plants in India are using MAINA’s Universal shafts today.
 
Types of Universal / Carden Shaft
Telescopic type U-Shaft
Fixed length U-Shaft
Hirth Serration flange U-shaft
Dog teeth flange U-Shaft
 
Planetary Gear Reducers (for heavy-duty applications)
Maina’s reference list covers the principal users of planetary gear reducers all over the world, and thus testifies Maina’s reliability and technical skills. MAINA is certified DNV ISO 9001.
 
In India Maina has already supplied to
Tata Iron & Steel Co.
Bokaro Steel Plant
Rourkela Steel Plant
Visakhapatnam Steel Plant
Usha Martin
Jindal Steel