Siti Gearboxes

Features:

• Gearboxes equipped with trains of gears at three stages of reduction.
• The three stages of reduction consist of: on the input side, one helical gear pair, with involute profile, accurately corrected for improved strength; in the middle, one bevel gear pair with spiral Gleason Toothing (duplex type); one cylindrical final gear pair, with involute profile, accurately corrected in view of an improved strength.
• These gearboxes are made in 8 sizes: 63 - 80 - 100 - 125 - 140 - 160 - 180 - 200.
• Rated transmissible torques range from 280 Nm to 14000 Nm.
• Load capacities of toothing comply with DIN 3990, UNI 8862, AGMA 2001 B88 norms and the ISO 6336 draft proposal, both with the surface pitting resistance and the tooth root bending strength calculation, in view of an accurately balanced and extremely high nominal life.
• The output shafts of sizes 63, 80, 100, 125 are supported by radial ball bearings; on request, taper roller bearings can be fitted on these sizes. On the contrary, taper roller bearings are standard on the sizes 140, 160, 180, 200.
• The whole range of gears is made in case hardening steel (18NiCrMo5 or material equivalent in strength and harden ability) and submitted to case hardening, quenching and stress-relieving, to give high resistance to static and dynamic loads and to wear.
• Hollow output shafts (standard solution) are made in steel.
• Solid output shafts (optional) are made in hardening and tempering steel 42CrMo4 or materials assuring similar properties.
• Housings are built in G25 cast iron according to UNI 5007 specifications.
• Dynamic efficiencies are very high: 0.92.
• It is allowed to operate in particularly severe conditions of application, still saving sufficiently satisfactory life times; in connection with this, we recommend to strictly adhere to the indications of our technical catalogue and, if in doubt, to contact our technical dept.