Worm gear reducers and combined units


Worm gear reducers and combined units

  • Worm gear reducers and combined units

The SW reducer, which complements the Motovario NMRV gear reducer, has a shaft height between 30 and 110 mm (Baugrößen 030 bis 105) and a compact round smooth body casing design that reduces the space as much as possible.

For better reliability and compatibility/effectiveness of supply, the gearing, the bearings, the motor flange and the accessories are those of the NMRV series.

Warranty: Two years from date of delivery. 

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  • Sizes: 030-040-050-063-075-090-105  
  • Available versions: SW - fitted for motor coupling, ISW - with input shaft, SWL - with torque limiter  
  • Power up to 7,5 kW  
  • Aluminuium units are supplied complete with synthetic oil which allows universal position mounting, with no need to modify lubricant quantity. Moreover units without plugs reduce the risk of oil oxidation and contamination.  
  • Reduction ratios between 5 and 100  
  • Max torque 630 Nm and admissible radial loads max 12.000 N  
  • Cases in die-cast aluminium alloy
  • Worm wheel: bronze Cu Sn12 Ni2 (UNI7013-10)  
  • Ground worm profile ZI (UNI4760)  
  • Excellent mechanical strength while being especially lightweight  
  • Load capacity calculated to BS721-83 and verified according to Niemann  
  • Painted with RAL 5010 blue epoxy-polyester powder
  • Worm gear reducers are available with diffferent combinations: SW+SW and SW+ISW
  • Options: torque arm, feet mounting, output flange, output shaft kit, cover, double extention high speed shaft

To enable us to identify the correct product for your requirements please complete the below form.

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Motor Type

Motor Information
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Protection degree

Gearbox speed (rpm)

Speed range (rpm)

Required torque (max/average)

Description of the application

Stop-Starts/Hr (Qty) - Duty


Casing version

Gearbox mounting

Mounting position (see catalogue)

Loading (Please refer to the “Service Factor” paragraph on the catalogue)

Fr/Fa radial/axial load

Connection(direct, coupling, belt drive, chain...)

Minimum Service Factor required

Certifications/ Regulations required

Presence of external heat sources ((from sun, environment and/or machines)

Installation environment
Type of atmosphere
The following information is useful and necessary to identify the correct product according to the European ATEX Directive 94/9/CE. Please, fill the blank spaces of this document. Important note: Motovario cannot supply products for Atex 1D/1G or Zone 0

Type of zone

Permitted surface temperature
GAS (Temperature class)


Motovario, if above information is provided, can confirm harmonization to EN1127-1 and from EN13463-1 to EN13483-8 for: H/HA Series - Helical gear reducers, B/BA Series - Helical bevel gear reducers, S Series - Shaft mounted gear reducers, NMRV/NMRV-P Series - Worm gear reducers.
In case of order, the information above must be provided to enable the supply of the product necessary certification, file number and data for the nameplate.
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