Purchase now: Bonfiglioli A 35 2 NH 25 P100 B5 Gearbox
Purchase now: Atlantechdrives provides you the A 35 2 NH 25 P100 B5, a highly advanced, ultra-efficient orthogonal (right-angle) helical-bevel gear reducer engineered by the global transmission specialists at Bonfiglioli. Belonging to the elite A Series, this heavy-duty gearbox delivers unmatched mechanical efficiency and rugged durability for precision industrial automation. Unlike traditional worm gears that lose substantial power to heat generation, the helical-bevel architecture of the A 35 ensures that over 95% of your electric motor’s power is transferred directly to the output shaft. This specific model features a 2-stage reduction resulting in a highly versatile 25:1 ratio. Its standout physical feature is the «NH» (Hollow shaft with Shrink Disc) output configuration, which provides a premium, completely backlash-free connection to your driven machine. Designed to accept a robust IEC P100 motor via a standard B5 mounting flange, it is the ultimate transmission for high-torque rotary tables, heavy extruders, and precision conveyor networks.
Technical Specifications of the A 35 2 NH 25 P100 B5
The A 35 series features a highly rigid, unibody cast-iron housing designed to withstand extreme radial and axial shock loads without compromising the delicate internal bevel gear alignment. The gears are case-hardened and precision-ground for silent operation.
- Part Number: A 35 2 NH 25 P100 B5
- Gearbox Series: A (Orthogonal Helical-Bevel Reducer)
- Frame Size: 35 (Heavy-duty cast iron design)
- Number of Stages: 2 (Dual reduction gearing)
- Reduction Ratio (i): 25:1
- Output Configuration: NH (Hollow shaft with keyless Shrink Disc)
- Motor Interface: IEC P100 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, providing a 360-degree frictional clamping force that eliminates the mechanical slop associated with keyed shafts. 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 is present on the mating surfaces, the coefficient of friction drops to zero, and the machine shaft will slip violently inside the gearbox under torque load, destroying both expensive components. Thoroughly clean the machine shaft with a heavy-duty degreaser before tightening the shrink disc bolts evenly with a calibrated torque wrench in a circular pattern.
Maintenance: Torque Arm Anchoring and Dynamic Reversibility
Because the A 35 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 P100 electric motor turns on. You must safely anchor the gearbox to the machine frame using a torque arm (reaction arm). Never bolt a torque arm completely rigid; you must use rubber vibration-dampening bushings at the anchor point. Additionally, engineers must understand that a 25:1 helical-bevel gearbox is completely dynamically reversible. 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 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, and making removal years later much easier.
Q: Is this gearbox pre-filled with oil from the factory?
A: Heavy-duty cast iron gearboxes like the A 35 are often shipped without oil to prevent leaks during international transport, or they require you to verify the oil level based on your specific mounting position. Always check the engineering manual and fill with the correct ISO VG synthetic gear oil before running the motor.
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