Purchase now: Bonfiglioli W 75 U 7 P100 B5 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 75 U 7 P100 B5 B3, a rugged, industrial-grade universal worm gear reducer engineered by the power transmission experts at Bonfiglioli. As a core component of the heavy-duty W Series, this gearbox is specifically designed to handle severe torque applications and shock loads that would easily destroy standard lightweight drives. The «U» designation stands for a Universal unibody housing, precision-machined on multiple faces to provide unmatched mounting flexibility in complex machine frames. This specific unit is configured with a highly aggressive, incredibly fast 7:1 reduction ratio, making it the perfect 90-degree transmission for high-speed automated packaging, rapid indexing mechanisms, and high-velocity sorting conveyors. Designed to accept a robust IEC P100 frame electric motor via a standard B5 mounting flange, it offers a formidable blend of speed and mechanical durability.
Technical Specifications of the W 75 U 7 P100 B5 B3
The W 75 series utilizes a profile-ground steel worm shaft paired with a highly wear-resistant, centrifugally cast bronze worm wheel. This metallurgical combination ensures optimal sliding friction, reducing operating noise and extending the lifespan under continuous 24/7 duty cycles.
- Part Number: W 75 U 7 P100 B5 B3
- Gearbox Series: W (Heavy-Duty Worm Gear Reducer)
- Frame Size: 75
- Housing Type: U (Universal, multi-face mounting)
- Reduction Ratio (i): 7:1 (Ultra-low ratio, high output speed)
- Motor Interface: IEC P100 frame
- Motor Flange Type: B5 (Large standard mounting flange)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Tips: Total Dynamic Reversibility
Understanding mechanical holding power is vital when dealing with ultra-low worm gear ratios. Expert Tip: The 7:1 reduction ratio places the W 75 squarely in the category of total dynamic reversibility. Because the lead angle of the internal steel worm thread is incredibly 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, 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 oil during operation, the air inside the housing expands. To prevent this expanding pressure from blowing out the critical input and output 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 P100 B5 input accept?
A: A standard IEC 100 frame motor with a B5 flange features a 28mm diameter solid shaft and a 250mm outer flange diameter. The gearbox input quill and mounting flange are perfectly matched to these dimensions.
Q: Can I use standard automotive gear oil in the W 75?
A: No. High-performance industrial worm gears require specific ISO VG 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.
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