Bonfiglioli VF49 V P71 B5 Worm Gearbox i=18

The Bonfiglioli VF49 V P71 B5 worm gearbox is a compact right angle reducer configured with an 18:1 reduction ratio and a P71 B5 motor flange. The VF49 size belongs to the Bonfiglioli VF series of worm gearboxes, which are designed for smooth and quiet power transmission in industrial machinery. The V configuration and P71 B5 flange make the unit suitable for direct mounting of a standard IEC 71 frame motor with a B5 flange. This gearbox is often used in conveyors, packaging machinery, and general industrial equipment where a compact reduction unit is required.

Product Overview

The VF series uses a worm and wheel design to achieve high reduction ratios in a single stage. A hardened and ground worm shaft drives a bronze worm wheel, producing smooth motion and low noise. The VF49 size is a mid sized unit that offers a practical balance between torque capacity and compact dimensions. The 18:1 ratio provides a moderate speed reduction, making the gearbox suitable for applications that need controlled output speed without an excessively large unit.

The P71 B5 motor flange allows a standard IEC 71 frame motor to be mounted directly to the gearbox. Direct mounting simplifies alignment and creates a compact drive assembly. The V configuration defines the mounting and shaft arrangement of the unit. The gearbox housing is designed to support the worm shaft and wheel with sufficient rigidity for stable gear mesh. Seals protect the lubricant and bearings from dust and moisture.

Construction and Design

The housing of the VF49 is built to maintain correct alignment between the worm shaft and the worm wheel under load. The worm shaft is hardened and ground for smooth contact and reduced wear. The bronze worm wheel provides favorable friction characteristics and helps the gearbox run quietly. Bearings support the radial and axial forces generated by the worm gear action. Lubrication is contained within the housing and distributed to the gear mesh and bearings during operation.

The P71 B5 flange is machined for precise motor mounting. Correct flange alignment ensures proper engagement between the motor shaft and the gearbox input. The V configuration may include specific shaft and mounting features that suit particular machine layouts. The housing design supports heat dissipation, which is important in worm gearboxes because sliding contact generates heat. Proper lubrication and clean exterior surfaces help maintain stable operating temperatures.

Performance Characteristics

The 18:1 ratio of the VF49 V P71 B5 determines the relationship between input speed and output speed. The output speed is calculated by dividing the motor speed by eighteen. The torque at the output depends on the motor power, the gearbox efficiency, and the service factor. Worm gearboxes provide gradual torque transfer, which helps reduce shock in driven equipment. The smooth engagement of the worm and wheel also contributes to quiet operation.

Worm gearboxes have a self locking tendency under many load conditions. This can be useful when the load must remain in position after the motor stops. However, self locking is not guaranteed in all conditions and should be verified for the specific application. Efficiency depends on the ratio, load, speed, and lubrication. The VF49 is designed for continuous industrial duty when selected and installed correctly. Thermal capacity should be checked for high duty cycles or high ambient temperatures.

Applications

The Bonfiglioli VF49 V P71 B5 gearbox is suitable for belt conveyors, roller conveyors, packaging machines, labeling equipment, small mixers, and general industrial drives. The 18:1 ratio is useful in applications that require moderate speed reduction and increased torque. The right angle layout allows the motor to be positioned at 90 degrees to the driven shaft, which can save space in compact machine frames.

The P71 B5 flange supports direct motor mounting, which is common in modular conveyor systems and compact drive packages. The gearbox can be paired with standard three phase motors or other motors that match the flange interface. When variable speed operation is required, the motor and gearbox should be evaluated together to confirm that the speed range and torque are suitable. The VF49 can also be used in auxiliary drives where smooth operation and low noise are important.

Installation Guidelines

Installation should begin with a check of the nameplate data and a visual inspection of the gearbox. The unit should be mounted on a rigid base that can withstand the torque reaction. The motor should be aligned with the P71 B5 flange so that the motor shaft engages the gearbox input correctly. Mounting bolts should be tightened to the recommended torque. The output shaft should be aligned with the driven equipment to avoid excessive loads on bearings and seals.

After installation, the gearbox should be checked for smooth rotation and correct oil level. A short run without load helps confirm that the assembly operates correctly. Any unusual noise, vibration, or temperature rise should be investigated before full service. Electrical connections to the motor should be made by qualified personnel following local regulations. Proper grounding and correct motor rotation direction are essential for safe operation.

Maintenance Recommendations

Regular maintenance supports reliable performance and long service life. Oil level and oil condition should be checked at recommended intervals. The first oil change should be performed after the initial running in period, and later changes should follow the schedule for the operating conditions. Seals and bearings should be inspected periodically. Leakage, abnormal noise, or vibration should be addressed promptly.

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

Selection Considerations

When selecting the VF49 V P71 B5 gearbox, engineers should confirm the required output torque, output speed, duty cycle, and environmental conditions. The 18:1 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 P71 B5 flange must match the selected motor frame and flange type.

The V configuration should match the machine layout and the driven shaft arrangement. The gearbox mounting position should provide adequate support and allow correct lubrication. For applications that rely on holding or self locking, the load conditions should be evaluated carefully. Correct selection helps ensure smooth operation, stable thermal behavior, and long service life.

Conclusion

The Bonfiglioli VF49 V P71 B5 worm gearbox offers a compact 18:1 reduction solution with a P71 B5 motor flange and smooth worm gear operation. Its construction supports quiet torque transmission and reliable performance in conveyors, packaging machinery, and general industrial equipment. With correct installation and maintenance, the gearbox provides dependable operation and long service life.