Purchase now: Bonfiglioli W 63 U 7 P90 B5 B3 Gearbox
Purchase now: Atlantechdrives provides you the W 63 U 7 P90 B5 B3, a remarkably rugged, heavy-duty universal worm gear reducer engineered by the power transmission experts at Bonfiglioli. Belonging to the highly durable W Series, this gearbox is specifically designed to handle severe industrial torque applications and aggressive 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 machine frames. This specific unit is configured with an ultra-fast 7:1 reduction ratio. This extremely low ratio provides a massive output speed, making it the absolute perfect 90-degree transmission for high-velocity automated packaging lines, rapid sorting conveyors, and dynamic indexing machines. Designed to accept a robust IEC P90 frame electric motor via a standard B5 mounting flange, it offers a formidable blend of extreme speed and uncompromising mechanical durability.
Technical Specifications of the W 63 U 7 P90 B5 B3
The W 63 series utilizes a profile-ground steel worm shaft paired with a highly wear-resistant, centrifugally cast bronze worm wheel. Because of the extremely low 7:1 ratio, the sliding friction is minimized, resulting in a significantly higher mechanical efficiency compared to higher-ratio worm gears.
- Part Number: W 63 U 7 P90 B5 B3
- Gearbox Series: W (Heavy-Duty Cast Iron Worm Gear)
- Frame Size: 63
- Housing Type: U (Universal, multi-face mounting)
- Reduction Ratio (i): 7:1 (Ultra-low ratio, maximum output speed)
- Motor Interface: IEC P90 frame
- Motor Flange Type: B5 (Large standard mounting flange)
- Mounting Position: B3 (Horizontal, foot mounted)
Expert Tips: Total Dynamic Reversibility at High Speeds
Understanding mechanical holding power is absolutely vital when dealing with ultra-fast worm gear ratios like this one. Expert Tip: The 7:1 reduction ratio places the W 63 squarely in the category of total dynamic reversibility. Because the lead angle of the internal steel worm thread must be incredibly steep to achieve this fast speed, the gearbox will offer virtually zero resistance to back-driving. This means that if you turn off the electric motor, any kinetic energy or 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 requires sudden, precise emergency stops, you must absolutely install an external failsafe electromechanical brake on your AC motor.
Maintenance: Thermal Expansion and Vent Plugs
Unlike smaller fractional gearboxes that are sealed for life, 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 high-speed friction heats the internal synthetic ISO VG gear oil during operation, the air inside the cast-iron 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 P90 B5 input accept?
A: A standard IEC 90 frame motor features a 24mm diameter solid shaft. The B5 flange for the 90 frame has an outer diameter of 200mm. The gearbox input quill and mounting face are 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 and elevated operating temperatures. Using standard mineral or automotive oil will cause rapid overheating and premature bronze wheel failure.
Do you need more references from this brand? Explore our full catalog of Bonfiglioli here.
For inline helical reduction configurations within the same high-quality ecosystem, this universal gearbox perfectly complements the efficient C 12 2 P 10 P80 B14 drive series.
