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 a matched drive unit that pairs a frame 71 three phase motor with a worm gear reducer. The reducer provides a 36 to 1 reduction ratio and uses a 071 B14 motor interface. This combination is intended for machinery that needs a compact right angle drive with controlled output speed. Typical applications include conveyors, packaging units, and general industrial equipment where a matched motor and reducer package simplifies installation.

Product Overview

The BN71B4 motor is a four pole three phase asynchronous motor built on the IEC 71 frame. The frame size is compact enough for machines with limited mounting space, while the four pole design gives a practical speed for many general duties. The motor includes a stator, rotor, shaft, bearings, terminal box, and cooling fan. The terminal box provides a safe point for the electrical supply connection.

The MVF49 reducer uses a worm and wheel arrangement to reduce speed and multiply torque. The F1 071 B14 designation describes the shaft arrangement and the motor flange interface. The 36 to 1 ratio means the output speed is the motor speed divided by thirty six. The motor and reducer are assembled as a matched unit, which helps maintain correct alignment between the motor shaft and the reducer input.

Construction and Design

The motor housing supports the stator and bearing assemblies and provides the mounting interface. The rotor is mounted on a shaft supported by bearings selected for the expected radial and axial loads. The fan and fan cover provide cooling airflow over the motor housing. The terminal box is positioned to allow convenient wiring access. The motor shaft engages the reducer input through the 071 B14 interface.

The reducer housing supports the worm shaft and bronze worm wheel with enough rigidity to keep the gear mesh stable under load. The worm shaft is hardened and ground, and the worm wheel is made from bronze. Bearings carry the radial and axial forces generated by the gear action. Seals keep lubricant in and contamination out. The output shaft is machined for couplings, pulleys, or sprockets. Lubrication is contained in the reducer and distributed to the gear mesh and bearings during operation.

Performance Characteristics

The BN71B4 motor supplies the input power and speed, while the MVF49 reducer converts this into a lower output speed and higher torque. The 36 to 1 ratio gives a substantial reduction, which is useful where the driven equipment runs slowly. The worm gear design provides gradual torque transfer, helping to reduce shock loads in the driven machine. The matched assembly also helps keep vibration low because the motor and reducer are aligned at assembly.

The 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 both the motor and the reducer. The motor should be protected against overload and abnormal supply conditions. The reducer should be checked for thermal capacity in high duty cycles or high ambient temperatures. Correct lubrication and installation help maintain stable performance.

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 helpful in machines where a direct motor and reducer package is preferred. The right angle layout allows the motor to be positioned at 90 degrees to the driven shaft, which can simplify the machine frame.

The motor can be connected to standard industrial supplies according to its nameplate rating. The geared drive can be used in applications that require frequent starting and stopping, provided 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 wired 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 reducer 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 reducer 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 reducer efficiency. A service factor should be applied for starting loads, shock loads, and continuous operation.

The motor and reducer 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 with 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.