Purchase now: Bonfiglioli A 20 2 UH 15 P90 B14 Gearbox
Purchase now: Atlantechdrives provides you the A 20 2 UH 15 P90 B14, 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 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 20 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 fast, highly responsive 15:1 ratio. Its standout physical feature is the «UH» (Universal Hollow) output shaft, which allows the gearbox to slide directly onto your machine’s driven shaft, saving massive amounts of physical space. Furthermore, it is designed to accept an IEC P90 motor via a compact B14 face-mount flange, making it perfect for integration into space-constrained machine guards.
Technical Specifications of the A 20 2 UH 15 P90 B14
The A 20 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, vibration-free operation.
- Part Number: A 20 2 UH 15 P90 B14
- Gearbox Series: A (Orthogonal Helical-Bevel Reducer)
- Frame Size: 20 (Compact heavy-duty design)
- Number of Stages: 2 (Dual reduction gearing)
- Reduction Ratio (i): 15:1 (High output speed)
- Output Configuration: UH (Universal Hollow shaft with standard keyway)
- Motor Interface: IEC P90 frame
- Motor Flange Type: B14 (Compact face mount)
Expert Installation Advice: Managing Hollow Shaft Tolerances
The UH hollow shaft output provides a massive space-saving advantage, but it requires precise mechanical installation. Expert Tip: When sliding the A 20 gearbox onto the solid steel shaft of your driven machine, dimensional tolerance is absolutely critical. Ensure your machine shaft is machined to the correct ISO tolerance (typically h6 or j6). If the shaft is too thick, forcing the gearbox on with a hammer will instantly shatter the internal bearings. Furthermore, you must thoroughly coat the machine shaft and the internal keyway of the gearbox with a high-quality Molybdenum Disulfide (MoS2) anti-seize assembly paste before installation. Without this heavy paste, fretting corrosion will occur, permanently cold-welding the gearbox to your machine shaft and making future maintenance impossible.
Maintenance: Torque Arm Anchoring and Dynamic Reversibility
Because the A 20 is a shaft-mounted gearbox, the entire cast-iron housing will attempt to spin when the electric motor turns on. You must 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 15:1 helical-bevel gearbox is completely dynamically reversible. It offers almost zero 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, as this gearbox will not hold the load when power is removed.
Frequently Asked Questions (FAQs)
Q: What is the advantage of the B14 motor flange over a standard B5?
A: The B14 is a «face-mount» design where the mounting bolts pass directly through the gearbox casting and thread into the face of the electric motor. This significantly reduces the outer radial footprint of the assembly compared to the massive B5 flange, making it perfect for extremely tight spaces.
Q: Why choose the A 20 Helical-Bevel instead of a similarly sized worm gear?
A: The A 20 Helical-Bevel runs significantly cooler, consumes far less electrical power, and offers a much longer operational lifespan because it completely avoids the sliding friction wear inherent to worm gears. It is the premium choice for 24/7 continuous duty cycles.
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