Purchase now: Bonfiglioli W 63 U 45 P71 B5 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 63 U 45 P71 B5 B3, a rugged, highly durable universal worm gear reducer engineered by the global 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 shatter standard lightweight aluminum drives. The «U» designation stands for a Universal unibody housing, precision-machined on multiple faces to provide unmatched mounting flexibility in complex industrial machine frames. This specific unit is configured with a high-torque 45:1 reduction ratio, making it the perfect 90-degree transmission for heavy-duty material handling, inclined conveyors, large rotary mixing vats, and automated extrusion machinery. Designed to accept a robust IEC P71 frame electric motor via a standard B5 mounting flange, it offers a formidable blend of massive torque multiplication and mechanical durability.
Technical Specifications of the W 63 U 45 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 under extreme loads.
- Part Number: W 63 U 45 P71 B5 B3
- Gearbox Series: W (Heavy-Duty Worm Gear Reducer)
- Frame Size: 63
- Housing Type: U (Universal, multi-face mounting)
- Reduction Ratio (i): 45:1 (High ratio for torque multiplication)
- Motor Interface: IEC P71 frame
- Motor Flange Type: B5 (Large standard mounting flange)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Tips: The «Gray Zone» of Mechanical Irreversibility
Understanding mechanical holding power is absolutely vital when dealing with high worm gear ratios. Expert Tip: The 45:1 reduction ratio places the W 63 squarely in the mechanical «gray zone» of static irreversibility. Ratios below 30:1 are highly reversible, while ratios of 60:1 or above are considered firmly self-locking. At 45:1, the gearbox will generally hold a static load stationary when the motor is turned off. However, if the machine frame experiences a sudden vibration, a severe mechanical shock, or a temperature change that alters the internal oil viscosity, the static friction can break, and the load may suddenly back-drive the motor. Therefore, if your application involves a safety-critical inclined conveyor or a lifting hoist, you must not rely solely on this 45:1 worm gear to act as a fail-safe brake. Always install an external electromechanical brake on your AC motor.
Maintenance: Thermal Expansion and Vent Plugs
Unlike smaller fractional gearboxes, the heavy-duty W 63 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 of the 45:1 ratio 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.
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 is perfectly matched to these standard 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. Using standard mineral or automotive oil will cause rapid overheating and premature bronze wheel failure.
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