Purchase now: Bonfiglioli W 86 U 20 P100 B5 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 86 U 20 P100 B5 B3, a heavy-duty, industrial-grade universal worm gear reducer engineered by the power transmission experts at Bonfiglioli. Belonging to the rugged W Series, this gearbox is specifically designed to handle high torque applications where standard lightweight aluminum gearboxes would fail. The «U» designation indicates a Universal cast-iron housing, precision-machined on all faces to provide unmatched mounting flexibility. Configured with a 20:1 reduction ratio and designed to accept a robust IEC P100 frame motor via a B5 large mounting flange, this unit delivers exceptional mechanical advantage. It is heavily utilized in aggregate conveyors, industrial mixing vats, heavy packaging lines, and continuous extrusion machinery where reliable 90-degree power transmission is critical.
Technical Specifications of the W 86 U 20 P100 B5 B3
The W 86 series utilizes a profile-ground steel worm shaft paired with a highly wear-resistant bronze worm wheel. This metallurgical combination ensures optimal sliding friction, reducing noise and extending the operational lifespan under heavy shock loads.
- Part Number: W 86 U 20 P100 B5 B3
- Gearbox Series: W (Heavy-Duty Worm Gear Reducer)
- Frame Size: 86
- Housing Type: U (Universal, cast iron, multi-face mounting)
- Reduction Ratio (i): 20:1
- Motor Interface: IEC P100 frame
- Motor Flange Type: B5 (Large standard flange)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Installation Advice: The B3 Mounting and Vent Plugs
Unlike smaller, sealed-for-life gearboxes, the W 86 size requires active thermal and pressure management. Expert Tip: This specific gearbox is ordered in the B3 mounting position (horizontal, with the mounting feet at the bottom). When the internal synthetic oil heats up during continuous operation, the air inside the cast-iron housing expands. To prevent this pressure from blowing out the input and output oil seals, Bonfiglioli installs a breather/vent plug at the highest point of the gearbox based on the B3 orientation. If you change your machine design and mount this gearbox vertically on a wall without physically relocating the vent plug to the new highest port, the expanding oil will destroy the seals, causing a catastrophic lubrication leak and gear seizure. Always verify plug locations before startup.
Maintenance: Lubrication and Thermal Limits
Worm gears naturally generate more heat than helical gears due to their sliding contact. During the initial 48-hour «running-in» period, the W 86 will run hotter than normal as the bronze wheel mates with the steel shaft. Ensure the gearbox is filled with the correct ISO VG synthetic gear oil. Periodically check the oil level sight glass. If the ambient temperature is extremely high, ensure there is adequate airflow around the cast-iron housing to prevent the oil from breaking down and losing its viscosity.
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 shaft and a 250mm outer flange diameter. The gearbox input quill is perfectly matched to these dimensions.
Q: Is a 20:1 ratio gearbox self-locking?
A: Generally, no. While ratios of 60:1 or higher offer static self-locking properties (dynamic irreversibility), a 20:1 ratio worm gear can be easily back-driven by a heavy load when the motor is off. You must use an external motor brake if holding a load is required.
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