Purchase now: Bonfiglioli W 75 U 25 P90 B14 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 75 U 25 P90 B14 B3, a heavy-duty, industrial-grade universal worm gear reducer engineered by the power transmission experts at Bonfiglioli. As a core component of the highly durable W Series, this gearbox is specifically designed to handle severe torque applications and aggressive shock loads that would easily shatter standard lightweight aluminum drives. The «U» designation stands for a Universal unibody cast-iron housing, precision-machined on multiple faces to provide unmatched mounting flexibility in complex machine frames. This specific unit is configured with a highly versatile, relatively fast 25:1 reduction ratio, making it the perfect 90-degree transmission for high-speed automated packaging, continuous sorting conveyors, and industrial mixing vats. Designed to accept a robust IEC P90 frame electric motor via a compact B14 face-mount flange, it offers a formidable blend of speed, spatial efficiency, and uncompromising mechanical durability.
Technical Specifications of the W 75 U 25 P90 B14 B3
The W 75 series utilizes a profile-ground steel worm shaft paired with a highly wear-resistant, centrifugally cast bronze worm wheel. This heavy-duty metallurgical combination ensures optimal sliding friction, reducing operating noise and extending the lifespan under brutal, continuous 24/7 duty cycles.
- Part Number: W 75 U 25 P90 B14 B3
- Gearbox Series: W (Heavy-Duty Cast Iron Worm Gear)
- Frame Size: 75
- Housing Type: U (Universal, multi-face mounting)
- Reduction Ratio (i): 25:1 (Mid-to-low ratio, high output speed)
- Motor Interface: IEC P90 frame
- Motor Flange Type: B14 (Compact face mount)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Tips: Total Dynamic Reversibility
Understanding mechanical holding power is absolutely vital when dealing with lower worm gear ratios like this one. Expert Tip: The 25:1 reduction ratio places the W 75 squarely in the category of total dynamic reversibility. Because the lead angle of the internal steel worm thread must be relatively steep to achieve this fast speed, the gearbox will offer almost zero resistance to back-driving. This means that if you turn off the electric motor, any load attached to the output shaft will instantly back-drive the gearbox and cause the motor to spin freely backward. It will not act as a mechanical brake under any circumstances. If your application involves holding a load against gravity or sudden stops, you must absolutely install an external failsafe electromechanical brake on your AC motor.
Maintenance: Thermal Expansion and Vent Plugs
Unlike smaller fractional gearboxes that are sealed for life, the heavy-duty W 75 size requires active internal pressure management. This specific gearbox is configured from the factory for the B3 mounting position (horizontal, with the mounting feet at the bottom). As the sliding friction heats the internal synthetic ISO VG gear oil during operation, the air inside the cast-iron housing expands. To prevent this expanding pressure from blowing out the critical input and output rubber oil seals, Bonfiglioli installs a breather/vent plug at the highest point of the gearbox based strictly on this B3 orientation. If you alter your machine design and mount this gearbox vertically, you must physically relocate the vent plug to the new highest port, or you will experience a catastrophic lubrication leak.
Frequently Asked Questions (FAQs)
Q: What size motor shaft does the P90 B14 input accept?
A: A standard IEC 90 frame motor features a 24mm diameter solid shaft. The B14 face-mount flange for the 90 frame has an outer diameter of 140mm. The gearbox input quill and mounting face are perfectly matched to these standard dimensions.
Q: Can I use standard automotive gear oil in the W 75?
A: No. High-performance industrial worm gears require specific synthetic gear oil to handle the extreme pressure (EP) sliding friction and elevated operating temperatures. Using standard mineral or automotive oil will cause premature bronze wheel failure.
Do you need more references from this brand? Explore our full catalog of Bonfiglioli here.
If your system requires a more compact speed reduction unit with lower torque thresholds, the VF 44 P1 35 P71 B14 B3 provides a versatile alternative within the same modular ecosystem.
