Purchase now: Bonfiglioli A 20 2 NH 30 P90 B5 Gearbox
Purchase now: Atlantechdrives provides you the A 20 2 NH 30 P90 B5, a premium, high-efficiency orthogonal (right-angle) helical-bevel gear reducer masterfully engineered by the power transmission experts at Bonfiglioli. Belonging to the elite A Series, this heavy-duty gearbox is specifically designed to provide the space-saving benefits of a 90-degree drive while delivering the extreme mechanical efficiency (often exceeding 95%) of a helical gear train. This specific unit features a 2-stage reduction design to achieve a precise 30:1 reduction ratio, making it ideal for high-torque conveyor systems, industrial extruders, and precision rotary tables. Its standout physical feature is the «NH» (Hollow shaft with Shrink Disc) output configuration, which provides a premium, completely backlash-free frictional connection to your driven machine. Designed to accept a robust IEC P90 electric motor via a standard B5 mounting flange, it is the ultimate transmission choice for applications where energy conservation and zero mechanical slop are strictly required.
Technical Specifications of the A 20 2 NH 30 P90 B5
The A 20 series utilizes a highly rigid unibody cast-iron housing that maintains absolute internal bevel gear alignment even under continuous radial and axial shock loads. The internal helical and bevel gears are case-hardened and precision-profiled for virtually silent, continuous 24/7 operation.
- Part Number: A 20 2 NH 30 P90 B5
- Gearbox Series: A (Orthogonal Helical-Bevel Reducer)
- Frame Size: 20 (Heavy-duty cast iron design)
- Number of Stages: 2 (Dual reduction gearing)
- Reduction Ratio (i): 30:1 (Mid-range output speed)
- Output Configuration: NH (Hollow shaft with keyless Shrink Disc)
- Motor Interface: IEC P90 frame
- Motor Flange Type: B5 (Large standard mounting flange)
Expert Installation Advice: Strict Shrink Disc Protocols
The NH shrink disc output is a massive engineering advantage over standard keyed shafts, providing a 360-degree frictional clamping force that eliminates mechanical backlash. However, it requires absolute precision during installation. Expert Tip: The golden rule of shrink disc installation is strict friction management. You must absolutely never lubricate, oil, or apply anti-seize paste to the internal bore of the gearbox or the surface of the driven machine shaft where the clamping force is applied. If oil or grease is present on the mating surfaces, the coefficient of friction drops to near zero. The machine shaft will slip violently inside the gearbox under torque load, destroying both expensive components instantly. Thoroughly clean the machine shaft with an industrial degreaser before tightening the shrink disc bolts evenly with a calibrated torque wrench in a circular pattern.
Maintenance: Torque Arm Anchoring and Reversibility
Because the A 20 is a shaft-mounted gearbox (suspended directly on the driven shaft via the shrink disc), the entire cast-iron housing will attempt to spin when the massive P90 electric motor turns on. You must safely anchor the gearbox to the machine frame using a torque arm (reaction arm) with rubber vibration-dampening bushings. Additionally, engineers must understand that a highly efficient 30:1 helical-bevel gearbox is completely dynamically reversible, unlike a 30:1 worm gear. It offers almost no resistance to back-driving. If your application involves holding a suspended load against gravity, you must install an external failsafe electromechanical brake on your AC motor.
Frequently Asked Questions (FAQs)
Q: What are the main benefits of the NH shrink disc over a standard keyed hollow shaft?
A: A standard keyway concentrates all the rotational torque on a single tiny piece of steel, which can wallow out and create mechanical backlash over time. A shrink disc clamps around the entire circumference of the shaft, distributing the torque evenly, eliminating backlash entirely, and making removal years later much easier.
Q: Is the A 20 Helical-Bevel more efficient than a worm gear?
A: Yes. Worm gears rely heavily on sliding friction, converting electrical energy into radiant heat. The A 20 transfers torque through the rolling contact of precision-ground gears, meaning it consumes significantly less electrical amperage to perform the exact same mechanical work and runs drastically cooler.
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