Varvel Worm Gearbox - F RT 28 - Output Shaft Ø14mm

Varvel F RT28 Worm Gearbox

The Varvel F RT28 worm gearbox with a square casing is a compact, robust, and high-performance mechanical transmission solution, designed to meet the demands of various industrial and agricultural environments. Combining reliability, efficiency, and ease of integration, it adapts to a wide range of machinery and installations.

At Dymatec Industries, each gearbox is carefully selected and configured to ensure total compatibility with modern equipment, while facilitating maintenance and maximizing service life. Entirely manufactured in Italy, in the Emilia-Romagna region, it is the result of recognized expertise in mechanical transmission. It is perfectly suited for:

• Conveyors and transport systems
• Mixers and continuous operation equipment
• Agricultural machinery
• Automated lines and labelling machines

How to choose your Varvel F RT28 worm gearbox?

The F RT28 integrates a motor-reducer coupling in G version, ensuring direct and efficient torque transmission while simplifying assembly. This design prevents the motor shaft from seizing in the gearbox, even after prolonged use, resulting in fast, simple, and economical maintenance operations.

Available reduction ratios

The gearbox is available with a wide range of reduction ratios, allowing precise adaptation of output speed and torque to the needs of each application:

• 5, 7, 10, 15, 20, 28, 40, 49, 56, 70, 80, 100

The output speed is simply obtained by dividing the motor speed by the selected ratio.

Machine mounting systems

The F RT28 can be installed in several configurations to adapt to all mechanical constraints:

• PC — Direct mounting on casing
• F — Mounting with output flange with standardized bolt circles
• B3 — Foot mounting
• BRV — with torque arm equipped with silent-blocks to absorb forces and vibrations

These solutions guarantee flexible, stable, and durable integration on the vast majority of industrial equipment.

Output shafts and configurations

In its standard configuration, the gearbox is supplied with a Ø14 mm hollow shaft for compact and direct mounting. It can also be configured with:

• AS — Single solid output shaft
• AD — Double solid output shaft

Motor input flange configuration and compatibility

The F RT28 is compatible with the most common standardized electric motors:

• IEC 56 B5 Ø120 or IEC 56 B14 Ø80 — for motors with shaft Ø9 × 20 mm
• IEC 63 B5 Ø140 or IEC 63 B14 Ø90 — for motors with shaft Ø11 × 23 mm

These configurations ensure a precise mechanical connection and optimal torque transfer between the motor and the gearbox. The gearbox is compatible with IEC 56B5, IEC 56B14, IEC 63B5, and IEC 63B14 standards.

Available options for the Varvel F RT28

The F RT28 model can be customized with numerous technical options:

• AD — Double output shaft
• AS — Single output shaft
• ASC — Protection cover for hollow shaft
• TLI — Internal torque limiter
• TLE — Adjustable external torque limiter
• CS — Tapered roller bearing at output
• GRM — Low backlash version for increased precision
• VB — Worm extension opposite the shaft
• VIT — Viton seals for aggressive environments
• ATEX — Version for explosive atmospheres
• TS — Breather hole
• SLP — Speed sensor PC/FL version
• SLS — Speed sensor S version

Replacement and multi-brand compatibility

For a reliable replacement, it is essential to verify that the existing output shaft is Ø14 mm to ensure perfect mechanical compatibility with the existing installation. In case of replacement or upgrade, it is recommended to provide the nameplate of the existing gearbox to quickly identify an equivalent solution or optimize application performance.

Worm gearboxes are generally interchangeable with those from the following manufacturers:

• Motovario
• Bonfiglioli
• SITI
• STM
• SEW-Eurodrive (depending on specific configurations)
• Rossi

Depending on your needs, we can offer a replacement with identical characteristics or an improved solution in terms of efficiency, torque, or service life.

Our technical and commercial team is available to assist you in choosing the most suitable gearbox for your industrial requirements and to ensure integration without major modification to your installation.