SITI

SITI S.p.A., founded in 1967, is presently consolidated with its two plants in Monteveglio (BO) in an area of more than 17,000 sqmtrs wherein the whole production process takes place. The manufacturing process benefits by a series of machining centers and robotized isles in which the automation reaches a level of excellence.

The production process is supported by an impressive number of the latest generation machine tools of very high flexibility and reliability: these two elements and the fact that the entire manufacturing processes are carried out internally enables the company to operate with an effective and constant level of quality control.

SITI’s main investment is not only concentrated on machinery but also focused towards people: with growing frequency young students receive trainings during and at the end of their school careers. The open-mindedness of SITI allows these students to gain early experience of a working environment within the company and afterwards gives them further opportunities.

I series - WORMGEARBOXES
Models: I, P+MI, CMI-I, U, P+MU, CMU-U

High modularity

• Worm gearboxes suitable for the modular assembling of flanges, feet and torque arm.

High versatility

• 12 sizes with wide range of different mounting positions.

High performances

• Power from 0.09 kW to 55 kW.
• Max torque 3000 Nm.
• Ratios up to 100/1.

High reliability

• Up to size 80, housing built in pressure die-cast aluminium, designed in order to guarantee lightness, strength and rigidity.
• For sizes beyond 80 we supply a sturdy cast iron housing that is also suitable for heavy-duty applications.
• “Zi” shape on worms and wormwheels for a silent working without vibrations.

P+MI Series - Wormgearboxes with primary reduction

High modularity

• Helical worm gearboxes suitable for modular assembling of flanges, feet and torque arm.

High versatility

• It is possible to supply a separate kit for an easy assembling on the standard gearbox.

High performances

• Power from 0.12 kW to 7.5 kW.
• Max torque 2500 Nm.
• Ratios up to 404/1.

High reliability

• Housing built in pressure die-cast aluminium, designed in order to guarantee lightness, strength and rigidity.
• “ZI” shape on worms and wormwheels for a silent working without vibrations.

CMI-I Series - Combined wormgearboxes

High modularity

• Worm gearboxes suitable for the modular assembling of flanges, feet and torque arm.

High versatility

• Wide range of combinations and mounting positions.

High performances

• Power from 0.09 kW to 6.6 kW.
• Max torque up to 4400 Nm.
• Ratios up to 10000/1.

High reliability

• Up to size 80, housing built in pressure die-cast aluminium, designed in order to guarantee lightness, strength and rigidity.
• For sizes beyond 80, we supply a cast iron housing that is also suitable for heavy duty applications.
• “ZI” shape on worm and wormwheels for a silent working without vibrations.

U Series - Wormgearboxes

High modularity

• Worm gearboxes suitable for the modular assembling of flanges and torque arm.

High versatility

• 6 sizes with wide range of different mounting positions.

High performances

• Power from 0.12 kW to 17.7 kW.
• Max torque 885 Nm.
• Ratios up to 100/1.

High reliability

• Housing built in pressure die-cast aluminium, designed in order to guarantee lightness, strength and rigidity.
• “ZI” shape on worm and wormwheels for a silent working without vibrations.

P+MU Series - Wormgearboxes with primary reduction

High modularity

• Helical worm gearboxes suitable for modular assembling of flanges and torque arm.

High versatility

• It is possible to supply a separate kit for an easy assembling on the standard gearbox.

High performances

• Power from 0.12 kW to 3.4 kW.
• Max torque 1053 Nm.
• Ratios up to 404/1.

High reliability

• Housing built in pressure die-cast aluminium, designed in order to guarantee lightness, strength and rigidity.
• “ZI” shape on worms and wormwheels for a silent working without vibrations.

CMU-U Series - Combined wormgearboxes

High modularity

• Worm gearboxes suitable for the modular assembling of flanges and torque arm.

High versatility

• Wide range of combinations and mounting positions.

High performances

• Power from 0.09 kW to 2.1 kW
• Max torque up to 885 Nm.
• Ratios up to 10000/1.

High reliability

• Housing built in pressure die-cast aluminium, designed in order to guarantee lightness, strength and rigidity.
• “ZI” shape on worm and wormwheels for a silent working without vibrations.

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NHL (NEW)

NHL Series - Helical inline gearboxes

High modularity

• Modular design with compact subgroups, for easy ratio replacement.
• Foot or flange mounting.

High versatility

10 sizes with 3 input versions. Wide range of different mounting positions. Integral geared motor construction, for use in restricted space.

High performances

Max input power 210 kW. Max torque 12000 Nm. Ratios up to 466/1.

High reliability

• Strengthened casing for heavy duty applications.
• High resistant gears made in an excellent material.
• Largely proportioned bearings.
• High quality sealing for improved leaking prevention.

BH (NEW) : OT : BH Series - Bevel helical gearboxes

High modularity

• Modular design with simple subgroups, for easy ratio replacement.

High versatility

• 8 sizes with 4 input versions.
• Wide range of different mounting positions.
• Integral geared motor construction, for use in restricted space.

High performances

• Max input power 291 kW.
• Max torque 14000 Nm.
• Ratios up to 226/1.

High reliability

• Strengthened casing for heavy duty applications.
• High resistant gears made in an excellent material.
• Largely proportioned bearings.
• High quality sealing for improved leaking prevention.

OT (P.A.M.) series = pre-arranged for motor fitting

MOT series = gearbox pre-arranged for motor fitting complete with motor

OT series with solid input shaft= for in direct drive transmission through belt, chain, gear drive or coupling

GENERAL DESCRIPTION

The design has been carried out on the computer, by using modern and sophisticated programs of dimensional check, strength calculation of gears, life calculation of bearings and shafts, and structural strength of the unit.

The construction has been based on a widely extended modularity, as well as flexibility and versatility of use and installation.

The high product quality comes both from the design techniques, mainly aimed to optimising all the performance parameters, and quality checks effected at all stages of manufacturing, assembling and on the finish products.

TECHNICAL FEATURES

Bevel helical gearboxes series OT (P.A.M) are equipped with motor assembling pre-arrangement.

When the units are fitted with electric motor, they are called MOT.

The bevel helical gearboxes OT with solid input shaft are used whenever the drive transmission to the gearbox is indirect, through belt , chain, gears etc.. or through coupling thus effecting a connection to the primary motor by means of a more or less complex cinematic chain of transmission.

MATERIALS AND HEAT TREATMENTS

All gears are made in case hardening steel (20 Mn Cr 5 or materials having similar strength and hardenability), and are submitted to case-hardening, quenching and stress relieving, aimed to giving high strength to static and dynamic loads and wear resistance.

The hollow output shafts (standard solution) are made in nodular cast iron type GS-400.

Housing are mono-block and are made in G 25 cast iron according to UNI 5007, except on the size 56 made in pressure die casting aluminium.

OUTER LOADS, EFFICIENCY, OPERATING CONDITIONS

All gearboxes are suitable to withstand high outer loads, both radial and axial ones.

Dynamic efficiency is very high: 0.96 on the versions with two stages of reduction and 0.92 in the versions with three stages of reduction.

It is possible to work in particularly severe operating conditions, still assuring a satisfactory time of life.

BEARINGS

Input, intermediate and output shafts are all supported by taper roller bearings, allowing a better adjustment of backlash and enabling higher strength to radial and axial loads.

TOOTH PROFILE AND TYPE OF GEARS

The achievement of the highest performance rates has been got by means of an extremely accurate toothing correction and rounding of tooth profiles.

The gearboxes of the BH series are equipped with two or three stages of reduction:

The gearboxes with two stages of reduction have the input stage consisting a bevel gear pair with spiral Gleason toothing (Duplex type tooth profile ) and a final stage consisting in a pair of helical gears, with an accurate correction of the tooth profile, aimed at the achievement of an optimised strength to loads.

The gearboxes with three stages of reduction are made by adding an additional preliminary reduction stage even consisting of a pair of helical gears, with an accurate correction of the tooth profile, aimed at the achievement of an optimised strength to loads.

The OT gearboxes are even characterized by having low noise levels, due to the compact construction and the optimised design and manufacture of gears.

OPTIONS

Output flanges
All gearboxes of the OT series can be equipped, upon request, with output flanges in standardised dimensions (B 5 flanges), having a square shape on the sizes 63-80-100 and a round shape on the sizes 56- 125-160.

Backstop device
Upon request, it is possible to supply the OT units equipped with backstop device, in order to prevent the reverse motion.

Output shafts
Upon request, the hollow output shaft can be supplied with a shrink disc, or alternatively solid output shaft can be supplied.

Performance

• Input power from 0,01 kW to 79,0 kW
• Output torque from N.m to 4840 Nm
• Reduction ratio from 9,83 to 599,01

Only the gearboxes OT with solid input shaft can take advantage of the max performance data, since they are free of dimensional bindings and of the standardisation of the electric motors.

PL Series - Parallel shaft gearboxes

High versatility

• 5 sizes that offer a wide range of possible mounting positions.
• Gearboxes provides with trains of gears at 2 or 3 stages of reduction.

High performances

• Power from 0.75 kW to 83 kW
• Max torque 4015 Nm
• Ratios up to 118/1.

High reliability

• Strengthened casing for heavy duty applications.
• High resistant gears made in top quality steel.
• Largely proportioned bearings.
• High quality sealing for improved leaking prevention.

PD Series - Shaft mounted helical gearboxes

High versatility

• 5 sizes that offer a wide range of possible mounting positions.
• Gearboxes provides with trains of gears at 2 or 3 stages of reduction.

High performances

• Power from 0.75 kW to 83 kW.
• Max torque 4015 Nm.
• Ratios up to 118/1.

High reliability

• Strengthened casing for heavy duty applications.
• High resistant gears made in top quality steel.
• Largely proportioned bearings.
• High quality sealing for improved leaking prevention.

RP2 Series - Shaft mounted helical gearboxes

High versatility

• 7 sizes that offer a wide range of possible mounting positions.

High performances

• Power from 1.9 kW to 108 kW.
• Max torque 6876 Nm.
• Ratios up to 30/1.

High reliability

• Strengthened casing for heavy duty applications.
• High resistant gears made in top quality steel.
• Largely proportioned bearings.
• High quality sealing for improved leaking prevention.

R Series - Bevel gearboxes

High versatility

• 4 sizes with three different configurations and many mounting positions.

High performances

• Power up to 8 kW.
• Max torque 35 Nm.
• Ratios up to 3/1.

High reliability

• Housing built in die-cast aluminium, designed, in order to guarantee lightness, strength and rigidity.
• High resistant gears made in high quality and highly resistant stainless steel.

MK Series - Mechanical speed variators

High modularity

• Matched with a large range of gearboxes, they are suitable to modular assembling of flanges, feet and torque arms.

High versatility

• 7 sizes, more than 200 versions, with wide range of different mounting positions.

High performances

• Power from 0.05 kW to 11 kW.
• Max torque 3000 Nm.
• Up to 6000 Nm when combined with bevel helical gearboxes.
• With the differential device, output speed can be brought to “zero” speed, when the motor is running.

High reliability

• Strengthened casing for heavy duty applications.
• Planets and races are made in special steel 100Cr6 and are in oil bath, that guarantee the best conditions of transmission of the motion by friction.

SITI ISV MOTO INVERTER combines the actual performance of mechanical variators with reliability and flexibility that are typical features of the electronic control.

With ISV MOTO INVERTER it is possible to adjust the system speed by operating locally, as it happens with the hand grip of a mechanical variator.

In order to carry out these adjustments, SITI ISV MOTO INVERTER is equipped with an integrated keyboard for an easy and direct configuration of the inverter.

A display allows to visualize conveniently the speed that was previously set and to check actual parameters.

Main features:

• It enables a remarkable cabling cost reduction, both labour and actual costs (due to cables not needing any shielding), as well as panel board costs, due to the smaller dimensions.
• No need of external filters.
• It is accordance with EC directives on the electromagnetic compatibility EMC, thanks to the absence of the external cables between motor and inverter and to the presence of an integrated filter that eliminates possible circuit transient.
• Inverter da kW 0.37 a 1.5
• Rated power output da kVA 0.8 a 2.9
• Rated current da A 1.1 a 3.7
• Motor power output da kW 0.37 a 1.5
• Input voltage V 380/440 (± 15%)

Model Codes:
MKF+MOT, MCF+MOT, I-MI+MOT, IL-MIL+MOT, P+MOT, HL-MHL+MHL, MI+MHL, IL-MIL+MHL, MKF+MI, MKF+MU, MEC, MI 41, MI double, MI for hydraulic motors, MK special input, MK special output for pumps, HL special output for pumps and T 56-132 Series (NEW)