Bonfiglioli RAN series bevel gearbox selection and maintenance guide

Mechanical installation and alignment process

The installation quality directly determines the noise, vibration, and service life of the gearbox.

1. Installation base and fastening

The bottom of the RAN series enclosure is equipped with installation screw holes, ensuring that the flatness of the installation plane is ≤ 0.05 mm/m. High strength bolts (performance grade 8.8 or above) should be used to tighten according to the specified torque.

For high vibration environments such as crushers and vibrating conveyors, it is recommended to install anti vibration pads or use elastic foundations.

2. Connection between input shaft and motor

The input shaft is a solid cylindrical shaft, usually connected to the motor shaft through an elastic coupling (such as a plum blossom or diaphragm type). It is necessary to strictly ensure coaxiality, and the deviation should be controlled within the allowable range of the coupling (usually radial ≤ 0.05 mm, angle ≤ 0.1 °).

If belt drive is used, it is necessary to ensure that the radial runout and end face runout of the pulley after installation meet the requirements to avoid additional bending moments acting on the input shaft bearing.

3. Installation points of hollow output shaft

The hollow shaft adopts a key connection method, and during installation, the output shaft sleeve needs to be inserted into the equipment shaft and fixed axially using a locking disc (expansion sleeve) or shaft end cover.

Key process: Clean the mating surface and apply anti bite agent before installation; When pushing in, special tools should be used to apply even force to avoid damaging the bearings or gears by knocking.

The locking plate bolts need to be tightened gradually in a staggered order to the specified torque, ensuring even locking force.

4. Ventilation valve and oil level confirmation

After installation, the temporary transportation blockage must be replaced with a working ventilation valve (the appropriate position should be selected according to the installation direction).

Check the oil level through the oil level plug to ensure that the lubricating oil reaches the specified mark. It is recommended to add ISO VG 320 or 460 mineral oil (specific viscosity as recommended in the manual) before the first operation, or synthetic oil can be used to extend the oil change cycle.

Lubrication Management and Maintenance Strategy

The RAN series is designed to be almost maintenance free, but proper lubrication management can significantly extend its service life.

1. Lubricating oil selection

It is recommended to use high-quality extreme pressure gear oil according to the standard, and the viscosity grade should be selected based on the ambient temperature and load. ISO VG 320 is recommended at room temperature (-10 ℃~40 ℃).

For high temperature environments (>40 ℃) or low-speed heavy loads, ISO VG 460 can be selected.

For food grade or special occasions, lubricants certified by NSF H1 should be used.

2. First oil change cycle

After the first 200-300 hours of operation, the first oil change should be carried out to remove metal particles generated during the break in period.

Afterwards, under normal operating conditions, change the oil every 2500-5000 hours or 1 year (whichever comes first). If the environment is harsh (high dust, high humidity), the cycle should be shortened.

3. Oil level inspection and refilling

The oil level should be checked every 500 hours of operation, and the same brand and model of lubricating oil should be used when adding oil to avoid mixing different additives.

If oil emulsification (whitening) or a large amount of metal shavings are found, the cause of seal failure or excessive gear wear should be promptly investigated.

4. Seal maintenance

The shaft end oil seal is a vulnerable component. If oil leakage is found at the shaft end, the oil seal lip should be checked for wear or the shaft neck for damage. When replacing the oil seal, special tools should be used to avoid scratching the surface of the shaft.

Typical application scenarios and configuration recommendations

1. Conveyor line drive

The RAN series hollow shaft is directly fitted onto the drum shaft, eliminating the need for couplings and bearing seats, resulting in a compact structure. Choose a 1:1 ratio for constant speed transmission, or use a reduction ratio to achieve speed matching.

2. Lifting system and screw jack

RAN 2R (Enhanced Thrust Type) is an ideal match for screw jacks, capable of bearing large axial forces and widely used in stage lifts, vehicle lifts, material platforms, etc. It is recommended to choose a dual axis extension input (with one side connected to the motor and the other side connected to the encoder or handwheel).

3. Multi axis synchronous drive

By using dual output shafts or connecting multiple RAN units in series, precise synchronization of multiple shafts can be achieved, such as roller shaft transmission in printing machines and drying cylinder groups in paper machines. At this point, it is important to ensure that the phase and speed ratio between each unit are consistent.

4. Mixing and blending equipment

When installing vertically, it is necessary to confirm the thrust direction. If the mixing blade generates a large axial force, RAN 2 or above specifications should be selected, and the bearing life should be checked.