Product Overview
The B3SH05 is part of the legendary Flender universal gear unit range, specifically tailored for low-power but high-torque requirements. By utilizing three stages of gear reduction, this model achieves significantly higher ratios than the 2-stage variants, making it ideal for slow-speed machinery. The solid shaft design ensures a rigid connection to the driven load, while the bevel-helical geometry provides an efficiency rating far superior to traditional worm gearboxes. Each unit features a torsion-resistant housing and precision-ground gear sets to ensure whisper-quiet operation and a long service life.
Technical Parameter Table
| Parameter | Detailed Specification |
| Input Power (P1) | 5.5 kW |
| Nominal Ratio (in) | 20, 25, 31.5, 40, 50, 63, 80, 100 |
| Output Shaft Diameter | 60 mm / 70 mm (Standard Options) |
| Gear Material | 20CrMnTi (Case-hardened steel) |
| Efficiency | ~94% (High energy-saving rating) |
| Housing Grade | GG20 High-strength Cast Iron |
| Lubrication Type | Mineral Oil (Standard) / Synthetic (Optional) |
Unique Features of the B3SH05
Tri-Stage Noise Suppression: Due to the 3-stage reduction (B3 series), the B3SH05 distributes the load across more teeth contacts, which inherently reduces the vibration frequency compared to larger 2-stage units at the same ratio.
Optimized Oil Flow for Low Power: The internal housing of the Size 05 is specifically baffled to ensure that even at a lower power of 5.5kW, the splashing effect is sufficient to lubricate the top-tier bearings without the need for a mechanical pump.
High Ratio Density: Unlike larger industrial boxes, the B3SH05 offers an exceptional torque-to-weight ratio in the high-reduction range (up to 100:1), allowing for the elimination of secondary belt drives or chains.
Accessories & Installation Flexibility
Specialized Add-ons
The B3SH05 can be customized with various modular components to suit specific site requirements:
V-Belt Input Package: For users who cannot direct-couple the 5.5kW motor, we provide a reinforced input bearing housing designed to handle the overhung loads of V-belt pulleys.
Electronic Oil Level Monitoring: A digital oil level switch can be integrated into the B3SH05 housing to provide real-time alerts to the control room, preventing catastrophic failure in remote installations.
Adjustable Motor Scoops: We offer a steel motor mounting scoop that bolts directly to the gearbox housing, ensuring perfect alignment and reducing the need for complex foundation work.
Related Model Reference Table
| Series Model | Configuration | Typical Ratio | Power Capacity |
| B3SH05 | Solid Shaft | 20 - 100 | 5.5 kW |
| B3DH05 | Hollow Shaft | 20 - 100 | 5.5 kW |
| B2SH05 | Solid Shaft | 6.3 - 18 | 7.5 kW - 11 kW |
| B3SH04 | Solid Shaft | 20 - 100 | 3 kW |
| B3SH06 | Solid Shaft | 20 - 100 | 7.5 kW |
Industry Applications
Textile Machinery: Precision driving of dyeing vats and finishing rollers.
Food & Beverage: Slow-speed agitators and small bottling line conveyors.
Waste Water: Polymer dosing pumps and small-scale clarifier drives.
Packaging: Box folding machines and palletizing units.
FAQ
Q1: Can the B3SH05 be used with a 4-pole or 6-pole motor?
A1: Yes, it is compatible with both. A 4-pole motor (approx. 1450 RPM) is the standard input, but a 6-pole motor can be used if even lower output speeds are required.
Q2: Is the B3SH05 compatible with aggressive chemical environments?
A2: For chemical applications, we recommend specifying the "Special Coating" option (C3 or C4 grade paint) and Viton oil seals to ensure the unit survives corrosive vapors.
Q3: What is the benefit of the 3rd stage in the B3 series?
A3: The 3rd stage allows for much higher reduction ratios while maintaining high efficiency. A 2-stage gearbox usually tops out at a ratio of 18 or 20; the B3SH05 goes up to 100.
Q4: Does this gearbox come pre-filled with oil?
A4: Typically, Flender units are shipped without oil to prevent leaks during transit. You must fill it to the specified level with the recommended lubricant before commissioning.
Q5: Can I mount this gearbox on a ceiling?
A5: Yes, but this requires a specific "Position 3" or "Position 4" lubrication setup to ensure the bearings at the top are not starved of oil. Please specify this at the time of order.
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