Purchase now: Bonfiglioli A 05 2 UH 10 P71 B5 Gearbox
Purchase now: Atlantechdrives provides you the A 05 2 UH 10 P71 B5, an ultra-compact, high-efficiency orthogonal (right-angle) helical-bevel gear reducer engineered by the transmission experts at Bonfiglioli. Belonging to the elite A Series, this gearbox delivers unmatched mechanical efficiency and rugged durability for precision industrial automation. Recognizing the industry trend toward miniaturization, Bonfiglioli introduced the ultra-compact «05» frame size to bring helical-bevel efficiency to applications traditionally dominated by small, inefficient worm gears. Unlike worm gears, the helical-bevel design of the A 05 ensures that over 95% of your electric motor’s power is transferred directly to the output. This specific model features a 2-stage reduction resulting in a fast 10:1 ratio. Designed to accept an IEC P71 motor via a B5 flange, its standout 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.
Technical Specifications of the A 05 2 UH 10 P71 B5
The A 05 series features a highly rigid, unibody housing designed to withstand radial and axial shock loads without compromising the delicate internal gear alignment. The gears are case-hardened and ground for silent operation.
- Part Number: A 05 2 UH 10 P71 B5
- Gearbox Series: A (Orthogonal Helical-Bevel Reducer)
- Frame Size: 05 (Ultra-compact design)
- Number of Stages: 2 (Dual reduction gearing)
- Reduction Ratio (i): 10:1 (High output speed)
- Output Configuration: UH (Universal Hollow shaft with standard keyway)
- Motor Interface: IEC P71 frame
- Motor Flange Type: B5 (Large standard mounting flange)
Expert Installation Advice: Managing Hollow Shaft Tolerances
The UH hollow shaft output is a massive space-saving advantage, but it requires precise installation. Expert Tip: When sliding the A 05 gearbox onto the solid steel shaft of your driven machine, dimensional tolerance is everything. 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 destroy the internal bearings. If the shaft is too thin, the keyway will rapidly wallow out under reversing loads. 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 paste, fretting corrosion will occur, permanently cold-welding the gearbox to your machine shaft.
Maintenance and Torque Arm Anchoring
Because the A 05 is a shaft-mounted gearbox (sliding directly onto the driven shaft), the entire gearbox 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). Maintenance Warning: Never bolt a torque arm completely rigid to the machine frame. You must use rubber vibration-dampening bushings at the anchor point. If the gearbox is bolted rigidly, any minor runout, bending, or misalignment in the driven machine shaft will transfer immense radial stress directly into the gearbox housing, shattering the internal bearings within a matter of weeks.
Frequently Asked Questions (FAQs)
Q: Is a 10:1 helical-bevel gearbox self-locking?
A: Absolutely not. Helical-bevel gears are highly efficient and completely reversible. A 10:1 ratio will be easily back-driven by any load when the electric motor is turned off. If your application involves holding a suspended load, you must install an external failsafe motor brake.
Q: Why choose the A 05 instead of a VF 30 or VF 44 worm gear?
A: The A 05 Helical-Bevel runs significantly cooler, consumes less electrical power, and offers a much longer operational lifespan because it avoids the sliding friction wear inherent to worm gears. It is the premium choice for 24/7 continuous duty cycles.
Do you need more references from this brand? Explore our full catalog of Bonfiglioli here.
