RAO - Helical bevel gear motor

When efficiency and versatility meet each other

Bonfiglioli spare parts RAO - Helical bevel gear motor

The design of RAO series gearboxes utilizes a fully machined and bored case, enabling totally universal assembly. The compact design combined with the use of high quality materials makes this series highly suitable for heavy duty applications. These units are available with 2 reductions (a set of bevel gears and a set of a spur gears) and with 3 reductions, with a set of ground helical gear placed before the bevel gear (size 35-90). For size 100 the structure is the same as corresponding RAP; the only difference is the assembly of the front bevel gear set. Upgraded torque ratings are due to redesigned gears, reinforced bearings and new material, namely spheroidal cast iron UNI GS 400-12, for housings of better quality and stiffness.

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Technical data

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Torque Range
220 Nm... 6.800 Nm

Mechanical Rating (n1= 1400 min-1)
0,25 ... 62 kW

Gear ratios
8,82 ... 220,9

Output Configuration
Integrated Foot mount

Input Configurations
IEC Adaptors
Metric series Solid Input Shaft

Applicable AC motors
IEC-normalized Motors and Brake motors - BN series/BE series
Single and Dual Speed Motors


Main Brake Features
DC and AC supply
Faster Brake Engage/Disengage through electronically
Controlled AC/DC Rectifier type SB, NBR, SBR (options)

Main Motor Options
Thermistors and Thermostates sensor
Separate Supply Forced Ventilation
Line Driver and Push-Pull Incremental Encoder

TypeTorque Nm
RAO 35220
RAO 45800
RAO 501500
RAO 602800
RAO 804500
RAO 906800