Purchase now: Bonfiglioli W 75 U 30 P80 B14 B3 Worm Gearbox
Purchase now: Atlantechdrives provides you the W 75 U 30 P80 B14 B3, a heavy-duty, highly adaptable universal worm gear reducer from Bonfiglioli’s premium W series. While the VF series caters to lighter loads, the W 75 is engineered to handle substantial torque demands in rigorous industrial environments such as bulk material handling, heavy-duty mixers, and continuous extrusion lines. The «U» designation stands for «Universal,» meaning the robust cubical housing is machined on multiple faces, allowing for extreme mounting flexibility. Configured with a 30:1 reduction ratio and designed to couple with an IEC P80 motor using a compact B14 flange, this unit delivers massive mechanical advantage. Furthermore, it is specifically configured for the B3 horizontal mounting position, optimizing internal lubrication for continuous, high-efficiency operation.
Technical Specifications of the W 75 U 30 P80 B14 B3
The W 75 features a highly rigid cast housing and precision-ground worm shafts to maximize torque transmission and minimize backlash, extending the operational life of the unit under shock loads.
- Part Number: W 75 U 30 P80 B14 B3
- Gearbox Series: W (Universal Worm Gear Reducer)
- Frame Size: 75
- Housing Type: U (Universal, machined on all sides)
- Reduction Ratio (i): 30:1
- Motor Interface: IEC P80 frame
- Motor Flange Type: B14 (Compact face mount)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Installation Advice: Vent Plugs and Mounting Positions
Mounting position is critical for gearboxes of this size. Expert Tip: Unlike smaller sealed-for-life units, the W 75 generates significant internal pressure as the synthetic oil heats up during operation. Because this unit is explicitly designated for the «B3» mounting position (horizontal, with the feet on the bottom), the factory installs a breather/vent plug at the highest point of the gearbox to allow this pressure to escape. If you ignore the B3 specification and mount this gearbox vertically on a wall (e.g., V5 position) without relocating the vent plug, the expanding oil will blow out the lower oil seals, resulting in catastrophic lubrication failure and total gear seizure. Always verify that the physical orientation of the gearbox matches the catalog mounting position so the breather, oil level, and drain plugs are properly located.
Maintenance and Overhung Loads
When connecting your driven machine to the hollow output shaft of the W 75 (typically via a solid plug-in shaft and a sprocket or pulley), you must calculate the Overhung Load (Radial Load). If your drive chain is tensioned too tightly, the massive radial force pulls sideways on the gearbox output bearings. Over time, this extreme stress will crush the bearings and cause the bronze worm wheel to misalign and grind against the steel shaft. Always position your sprockets as close to the gearbox housing as physically possible to minimize the leverage effect of the radial load, and strictly adhere to the maximum overhung load ratings specified in the Bonfiglioli manual.
Frequently Asked Questions (FAQs)
Q: What is the difference between a B5 and B14 motor flange?
A: The B5 is a large flange where the mounting bolts pass through clearance holes on the motor into threaded holes on the gearbox. The B14 (featured on this model) is a much smaller «face-mount» flange where the bolts pass through the gearbox flange and thread directly into the face of the motor, saving significant radial space.
Q: Can I change the mounting position in the field?
A: Yes, because it is a Universal (U) housing. However, if you change it from B3, you must physically unthread and swap the positions of the vent, level, and drain plugs to match the new highest and lowest points of the oil bath.
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