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MAINA Power Transmission

Established in 1886, MAINA Power Transmission has been operating for over 60 years in power transmission equipment for industrial plants and are capable of designing and manufacturing universal joints, gear spindles and gear couplings of large dimensions and very high quality.

Universal Joints Maina

Universal Joints

MAINA has been manufacturing industrial universal shafts for the last thirty years.The product range includes 26 sizes, divided according to the dimensions and the use, into:

  • Standard & Tunnel designs w/ swing diameters 180 – 620 mm
  • Heavy Duty designs w/ swing diameters up to 1300 mm
  • HISHAFT® transmission: suitable for standard swing diameters for increased performances and bearing life
Size Limiting Torque Nominal Torque Pulsating Torque Alternating Torque Swing Diameter Flange Connection
[Nm] [Nm] [Nm] [Nm] [mm] [mm]
22 52000 40000 26000 18000 225 DIN 250
25 62400 48000 38000 24000 250 DIN 285
28 92300 71000 58000 37000 285 DIN 315
31 133900 103000 85000 54000 315 DIN 350
35 189800 146000 116000 76000 350 DIN 390
39 254800 196000 156000 103000 390 DIN 435
Size Limiting Torque Nominal Torque Pulsating Torque Alternating Torque Swing Diameter Face key Flange Connection
[Nm] [Nm] [Nm] [Nm] [mm] [mm]
22 72800 56000 42000 28000 225 225 / 250
25 106600 82000 62000 41000 250 250 / 285
28 158600 122000 92000 61000 285 285 / 315
31 228800 176000 133000 88000 315 315 / 350
35 309400 238000 180000 119000 350 350 / 390
39 442000 340000 258000 170000 390 390 / 440
44 709800 546000 439000 290000 440 440 / 490
49 923000 710000 583000 385000 490 490 / 550
55 1357200 1044000 876000 578000 550 550 / 620
62 1950000 1500000 1288000 850000 620 620 / 680
Universal Joints Gear Couplings Maina

Gear Couplings

For over sixty years MAINA has been manufacturing gear couplings of all types and dimensions. The best quality of the raw materials and the highest accuracy of the machining, thanks to the latest toothing machines, enable MAINA to achieve the maximum load capacity in minimum space and the longest lifetime with minimum maintenance. MAINA’s diversified production range includes many types with capabilities for flange diameters ranging from ~ 100 mm to over 2500 mm. Standard production is fast and streamlined thanks to automated, robotic cells providing complete autonomy through various stages of turning/milling, drilling, and etching. Tailor-made solutions are developed on-demand to satisfy all possible customer needs in any variety of applications. Rigid, fixed, high-angle, high-torque or high-speed; on mill stands, cranes, ships or pumps.

  • GO-A series: standard couplings w/ outer flange diameter up to 505 mm
  • GO-B series: heavey duty couplings w/ outer flange diameter up to 2500 mm
  • HS series: High speed couplings w/ accurate precision ground gear teeth for speeds up to 36,500 rpm
  • GTS series: Barrel couplings for crane application w/ outer flange diameter up to 850 mm

Manufacturing

Steel forgings using AISI 1045 for standard couplings, 4140 for high-torque applications and higher-type materials when required Specialized heat treatments in order to limit surface corrosion, increase surface hardness & wear resistance

Low Angle, Long Distance

Spacer Couplings: a fixed tubular center section cut to length for the needs of your application between two flex half couplings Floating Shaft Coupling: two complete couplings with rigid outer halves and flex inner halves altered to accept a tubular center shaft

Universal Joints Gear Spindles Maina

Safety Devices

Safety devices protect all the items in a kinematic chain, allowing the line to work at a pre-set maximum level. In the event of a catastrophically high torque, the device interrupts the torque flow in the driveline, avoiding costly damage and production shutdown.

MAINA can supply different safety devices for incorporation between two flanges:

  • with shear pins, featuring a calibrated groove and an inner hole, the diameter of which affects the release torque
  • with a breaking spacer, also featuring a calibrated groove in the outer diameter of the pipe
  • with BIBBIGARD® modules
  •   in 2021, the HYDRO-SAFE® device, a combined hydraulic and mechanical unit

Details on HYDRO-SAFE® can be found in it’s dedicated catalog. More information on other safety couplings can be found in the Gear Coupling catalog.

Universal Joints Gear Spindles Maina

Gear Spindles

For over forty years, MAINA has manufactured gear spindles providing high-quality solutions for steel and metal rolling mills.

  • Fixed or telescopic intermediate units
  • High torque at up to 3° working angles
  • Options for nitriding, case hardening and tempering, with final grinding of the working teeth
  • HISPINDLE® transmission: 60% higher performance compared to standard carburized components