Purchase now: Bonfiglioli F 20 2 H 15 P90 B5 Gearbox
Purchase now: Atlantechdrives provides you the F 20 2 H 15 P90 B5, a premium, high-efficiency parallel shaft helical gear reducer from Bonfiglioli’s renowned F Series. Designed for applications where space is tight and maximum efficiency is required, the F Series offers a slim, flat profile that mounts directly onto the driven machine’s shaft. Unlike worm gears, helical gears transfer power with almost zero sliding friction, resulting in efficiencies exceeding 95%. This specific model features a 2-stage reduction achieving a 15:1 ratio, a Hollow output shaft (H) with a standard keyway, and an input flange designed for an IEC P90 B5 electric motor. It is the absolute optimal power transmission choice for shaft-mounted material augers, heavy-duty belt conveyors, and overhead crane drives where electrical energy savings and low heat generation are paramount.
Technical Specifications of the F 20 2 H 15 P90 B5
The F 20 utilizes a highly rigid, unibody cast-iron housing that maintains perfect internal gear alignment under heavy radial and axial shock loads. The helical gears are case-hardened and precision-ground for silent, continuous operation.
- Part Number: F 20 2 H 15 P90 B5
- Gearbox Series: F (Parallel Shaft Helical)
- Frame Size: 20
- Number of Stages: 2 (Dual reduction gearing)
- Output Configuration: H (Hollow shaft with keyway)
- Reduction Ratio (i): 15:1
- Motor Interface: IEC P90 frame
- Motor Flange Type: B5 (Large standard mounting flange)
Expert Installation Advice: The Crucial Torque Arm
Shaft-mounting a gearbox introduces unique mechanical dynamics that must be managed correctly. Expert Tip: Because the F 20 mounts directly onto the solid shaft of your driven machine via its hollow bore, the entire gearbox will attempt to spin around that shaft when the electric motor turns on. To prevent this, you must install a torque arm (reaction arm) connecting the gearbox housing to a fixed point on the machine frame. Never bolt the torque arm completely rigid; you must use rubber vibration dampening bushings at the anchor point. If you bolt the gearbox rigidly to the frame while it is suspended on the machine shaft, minor runout or shaft bending during operation will destroy the gearbox’s internal bearings within weeks.
Maintenance: Preventing Fretting Corrosion
One of the most common and costly maintenance nightmares involves hollow shaft gearboxes getting permanently stuck to the machine shaft. This is caused by «fretting corrosion»—microscopic vibrations that cause the steel surfaces to rust and cold-weld together. Before sliding the F 20 gearbox onto your machine shaft, you must thoroughly clean the shaft and apply a heavy coating of high-quality anti-seize paste (Molybdenum Disulfide) inside the hollow bore and along the keyway. This simple 5-minute step guarantees the gearbox can be easily removed for maintenance years down the line without needing a hydraulic puller or a blowtorch.
Frequently Asked Questions (FAQs)
Q: Why choose a parallel shaft (F Series) over an inline helical (C Series)?
A: Parallel shaft gearboxes have a flat, narrow profile, allowing the electric motor to sit parallel to the driven machine. This saves significant axial space, making it ideal for tight conveyor sides where an inline motor would stick out too far and block walkways.
Q: Can I run this gearbox in reverse?
A: Yes. Helical gears are completely symmetrical and highly efficient in both rotational directions, making them perfect for reversible conveyor applications.
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