Bonfiglioli BN71B4 Electric Motor with MVF49 F1 071 B14 Gearbox Ratio 36 to 1

The Bonfiglioli BN71B4 electric motor with MVF49 F1 071 B14 gearbox is an integrated drive assembly that combines a three phase motor with a worm gear reducer. The BN71B4 motor uses a frame 71 design with a four pole configuration. The MVF49 F1 071 B14 reducer provides right angle speed reduction with a ratio of 36 to 1. The 071 B14 interface connects the motor to the gearbox. This assembly is suitable for conveyors, packaging units, and industrial machinery that require compact reduction and reliable torque transmission.

Product Overview

The BN71B4 motor is a compact three phase asynchronous motor designed for industrial drive duties. The frame 71 size suits machines with limited mounting space. The four pole configuration provides a moderate speed suitable for many general applications. The motor includes a stator, rotor, shaft, bearings, terminal box, and cooling provisions. The MVF49 worm reducer reduces the motor speed and increases output torque according to the 36 to 1 ratio.

The MVF49 F1 071 B14 configuration defines the gearbox size, shaft arrangement, motor interface, and ratio. The gearbox housing supports the worm shaft and wheel with sufficient rigidity for stable gear mesh. The motor and gearbox are matched to form a compact assembly. The combined unit can be used in conveyors, packaging machinery, and general industrial equipment where a right angle drive is preferred.

Construction and Design

The BN71B4 motor housing supports the stator, rotor, bearings, and shaft. The stator windings are insulated for industrial operation. The rotor is mounted on a shaft supported by bearings selected for the expected loads. The fan and fan cover provide cooling airflow over the housing. The terminal box provides a safe connection point for the electrical supply. The motor shaft connects to the gearbox input through the 071 B14 interface.

The Bonfiglioli MVF49 gearbox uses a hardened worm shaft and a bronze worm wheel. The housing maintains correct alignment between the worm and wheel under load. Bearings support the radial and axial forces generated by the gear mesh. Seals protect the lubricant and bearings from dust and moisture. Lubrication is contained within the housing and distributed to the gear mesh and bearings during operation.

Performance Characteristics

The BN71B4 motor provides the input power and speed for the assembly. The four pole configuration produces a moderate speed, and the MVF49 gearbox reduces this speed according to the 36 to 1 ratio. The output torque is increased in proportion to the reduction ratio, subject to gearbox efficiency and torque limits. The worm gear design provides smooth torque transfer and quiet operation.

The integrated drive should be selected with an appropriate service factor for the duty cycle. Starting loads, shock loads, and continuous operation affect the thermal and mechanical capacity of the assembly. The motor should be protected against overload and abnormal supply conditions. The gearbox should be checked for thermal capacity when operating at high duty cycles or high ambient temperatures.

Applications

The Bonfiglioli BN71B4 with MVF49 F1 071 B14 reducer is suitable for small conveyors, packaging machines, labeling equipment, rotary feeders, and general industrial machinery. The compact assembly is useful in machines where space is limited and a direct motor and gearbox package is preferred. The worm gear reducer provides smooth operation and a right angle layout that can simplify machine design.

The motor can be connected to standard industrial supply arrangements according to the nameplate rating. The geared drive can be used in applications that require frequent starting and stopping, provided that the duty cycle and thermal capacity are considered. Correct selection helps ensure reliable operation and long service life.

Installation Guidelines

Installation should begin with a check of the nameplate data and a visual inspection of the assembly. The geared motor should be mounted on a rigid base that can withstand the torque reaction. Mounting bolts should be tightened to the recommended torque. The motor should be connected according to the terminal diagram for the available supply voltage. The output shaft should be aligned with the driven equipment to avoid excessive radial and axial loads.

After installation, the assembly should be checked for smooth rotation and correct oil level in the reducer. A short run without load helps confirm that the motor and gearbox operate correctly. The direction of rotation should be verified before connecting the load. Any unusual noise, vibration, or temperature rise should be investigated before full service.

Maintenance Recommendations

Regular maintenance supports reliable performance and long service life. The motor cooling fan and fan cover should be kept clean. The reducer oil level and oil condition should be checked at recommended intervals. Seals and bearings should be inspected periodically. Leakage, abnormal noise, or vibration should be addressed promptly. Electrical connections should be checked for tightness and signs of overheating.

The exterior of the motor and gearbox should be kept clean to support heat dissipation. Adequate airflow around the assembly helps maintain stable temperatures. In dusty or humid environments, additional protection may be needed. Maintenance records help identify trends and support planned servicing. Following a consistent maintenance schedule reduces the risk of unexpected downtime.

Selection Considerations

When selecting the BN71B4 with MVF49 F1 071 B14 reducer, engineers should confirm the supply voltage, frequency, motor power, output speed, output torque, duty cycle, and environmental conditions. The 36 to 1 ratio and motor speed determine the output speed. The available torque depends on motor power and gearbox efficiency. A service factor should be applied for starting loads, shock loads, and continuous operation.

The motor and gearbox interfaces must match. The mounting arrangement should suit the machine layout and provide adequate support. The output shaft and mounting features should match the driven equipment. Correct selection and installation help ensure smooth operation, stable thermal behavior, and long service life.

Conclusion

The Bonfiglioli BN71B4 motor with MVF49 F1 071 B14 gearbox offers a compact integrated drive solution with a three phase motor and a 36 to 1 worm gear reduction. Its construction supports dependable torque transmission in conveyors, packaging units, and industrial machinery. With correct installation and maintenance, the assembly provides stable performance and long service life.