Purchase now: Bonfiglioli W 63 U 15 P71 B5 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 63 U 15 P71 B5 B3, a highly durable, industrial-grade universal worm gear reducer engineered by the power transmission experts at Bonfiglioli. Belonging to the heavy-duty W Series, this gearbox is specifically designed to handle intense torque applications and severe radial shock loads that would easily destroy standard lightweight aluminum drives. The «U» designation stands for a Universal unibody cast housing, precision-machined on multiple faces to provide unmatched mounting flexibility in complex machine frames. This specific unit is configured with a versatile, relatively fast 15:1 reduction ratio, making it the perfect 90-degree transmission for high-speed automated packaging lines, rapid rotary indexing mechanisms, and dynamic sorting conveyors. Designed to accept a robust IEC P71 frame electric motor via a standard B5 mounting flange, it offers a formidable blend of speed, efficiency, and mechanical durability.
Technical Specifications of the W 63 U 15 P71 B5 B3
The W 63 series utilizes a profile-ground steel worm shaft paired with a highly wear-resistant, centrifugally cast bronze worm wheel. This premium metallurgical combination ensures optimal sliding friction, drastically reducing operating noise and extending the lifespan under continuous 24/7 duty cycles.
- Part Number: W 63 U 15 P71 B5 B3
- Gearbox Series: W (Heavy-Duty Worm Gear Reducer)
- Frame Size: 63
- Housing Type: U (Universal, multi-face mounting)
- Reduction Ratio (i): 15:1 (Low ratio, high output speed)
- Motor Interface: IEC P71 frame
- Motor Flange Type: B5 (Large standard mounting flange)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Tips: The Dynamics of a 15:1 Ratio and Reversibility
Understanding mechanical holding power is absolutely vital when dealing with low worm gear ratios. Expert Tip: The 15:1 reduction ratio places the W 63 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 and high mechanical efficiency, the gearbox will offer almost zero resistance to back-driving. This means that if you turn off the electric motor, any heavy 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 suspended load against gravity or requires sudden emergency stops, you must absolutely install an external failsafe electromechanical brake on your AC motor.
Maintenance: Thermal Expansion and Vent Plugs
Unlike smaller fractional, sealed-for-life gearboxes, the heavy-duty W 63 size requires active internal pressure and thermal 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 ISO VG synthetic gear oil during operation, the air inside the cast 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 P71 B5 input accept?
A: A standard IEC 71 frame motor with a B5 flange features a 14mm diameter solid shaft and a 160mm outer flange diameter. The gearbox input quill and mounting flange are perfectly matched to these standard IEC dimensions.
Q: Can I use standard automotive gear oil in the W 63?
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 and overheating.
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