Purchase now: Bonfiglioli W 63 U 80 P71 B5 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 63 U 80 P71 B5 B3, a highly robust, industrial-grade universal worm gear reducer expertly engineered by the global power transmission specialists at Bonfiglioli. Belonging to the exceptionally durable W Series, this heavy-duty gearbox is specifically designed to handle intense torque applications, continuous duty cycles, and severe radial 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 geometric faces to provide unmatched mounting flexibility in complex industrial machine frames. This specific unit is configured with a massive 80:1 reduction ratio, making it the perfect 90-degree transmission for ultra-slow, high-torque applications such as heavy-duty inclined conveyors, massive rotary mixing vats, precise positioning tables, and automated heavy extrusion machinery. Designed to seamlessly accept a standard IEC P71 frame electric motor via a large B5 mounting flange, it offers a formidable blend of extreme torque multiplication, spatial efficiency, and uncompromising mechanical durability.
Technical Specifications of the W 63 U 80 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. Under the intense sliding friction of an 80:1 ratio, this premium metallurgical combination ensures optimal heat dispersion, drastically reducing operating noise and extending the lifespan under brutal 24/7 operations.
- Part Number: W 63 U 80 P71 B5 B3
- Gearbox Series: W (Heavy-Duty Cast Iron Worm Gear)
- Frame Size: 63 (Industrial cast iron frame)
- Housing Type: U (Universal, multi-face mounting)
- Reduction Ratio (i): 80:1 (Ultra-low output speed, maximum torque)
- Motor Interface: IEC P71 frame
- Motor Flange Type: B5 (Large standard mounting flange)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Tips: Absolute Static Irreversibility
Understanding mechanical holding power is absolutely vital when dealing with ultra-high worm gear ratios like the 80:1. Expert Tip: The 80:1 reduction ratio firmly places the W 63 into the category of absolute static irreversibility (self-locking). The lead angle of the internal steel worm thread is incredibly shallow. This geometry ensures that when the electric motor is turned off, the internal friction angle is so steep that no amount of kinetic load on the output shaft can back-drive the gearbox. It acts as a highly effective, natural mechanical brake, securely holding suspended loads or heavy inclined conveyors perfectly stationary. However, while it is statically self-locking, extreme machine vibrations can sometimes induce micro-slippage over time. For critical safety lifts involving suspended weights above human transit areas, regulatory standards still demand the installation of an external failsafe electromechanical brake on your AC motor.
Maintenance: Thermal Management in High-Ratio Drives
Unlike smaller fractional aluminum gearboxes, the heavy-duty W 63 cast-iron size requires active internal pressure management, especially with an 80:1 ratio that generates massive amounts of heat due to sliding friction. This specific gearbox is configured from the factory for the B3 mounting position (horizontal, with the integral mounting feet at the bottom). As the high-ratio friction heats the internal synthetic ISO VG gear oil during operation, the air inside the rigid housing expands significantly. 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 features a 14mm diameter solid shaft. The B5 mounting flange for the 71 frame has an outer diameter of 160mm. The gearbox input quill and mounting face are perfectly matched to these standard IEC dimensions.
Q: Will the cast-iron housing get hot during continuous operation?
A: Yes, absolutely. An 80:1 worm gear generates a massive amount of sliding friction, converting a portion of the electrical energy into radiant heat. The heavy cast-iron housing is specifically designed to act as a heat sink and will run hot to the touch during continuous 24/7 duty cycles.
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