Product Overview
The Flender B2SH06 37kW unit belongs to the universal Siemens industrial gear range, known for its modularity and reliability. By utilizing a first-stage spiral bevel set followed by a high-precision helical gear stage, it achieves a balance between quiet operation and high torque output. The solid shaft design is specifically reinforced to handle significant overhung loads, making it ideal for direct coupling or sprocket-based drive systems. Its "monoblock" style casing ensures oil-tight integrity and high torsional stiffness under peak load conditions.
Technical Parameter Table
| Parameter | Metric Value | Imperial Value |
| Nominal Power (P_n) | 37 kW | 49.6 HP |
| Output Speed (n_2) | 50 – 260 RPM | (Varies by Ratio) |
| Solid Shaft Diameter | 70 mm / 80 mm | 2.75" / 3.15" |
| Mechanical Efficiency | > 96% | - |
| Service Factor (f_s) | 1.25 – 2.5 | (Application specific) |
| Casing Material | Nodular Cast Iron | - |
| Weight (Dry) | ~295 kg | ~650 lbs |
| Oil Capacity | 12.5 - 16 Liters | 3.3 - 4.2 Gallons |
Unique Features of the B2SH06
What sets the B2SH06 apart from smaller units or standard helical drives is its specific focus on durability and thermal headroom:
Extended Bearing Life Geometry: The B2SH06 utilizes oversized spherical roller bearings on the output side. This is specifically designed to counteract the radial forces generated in 37kW belt-driven applications.
Friction-Optimized Gear Meshing: The helical gear stages feature a high-contact ratio tooth profile. This reduces the specific tooth pressure, which in turn minimizes heat generation at the 37kW power threshold.
Pressure-Equalized Housing: Equipped with a specialized breathers system that prevents internal pressure buildup, protecting the oil seals from premature "sweating" or leakage during rapid temperature fluctuations.
Noise-Damping Surface Design: The casting of the B2SH06 includes reinforced ribbing that acts as a natural acoustic dampener, making it significantly quieter than welded-steel alternatives.
Custom Installation & Combination Solutions
The B2SH06 is rarely a standalone component. To meet specific site requirements, it can be integrated with the following:
Alignment Brackets & Baseplates: We provide custom-welded steel baseplates that accommodate both the 37kW motor and the B2SH06 gearbox, ensuring perfect shaft alignment and simplified installation.
Hydraulic Start-up Couplings: For high-inertia loads (like loaded conveyors), the B2SH06 is often paired with a Flender FLUDEX fluid coupling. This allows the 37kW motor to reach speed before taking on the load, protecting the gear teeth.
Forced Lubrication Systems: For vertical installations or high-speed input scenarios, an integrated oil pump can be mounted to ensure the top-tier bearings receive constant lubrication.
Related Model Reference Table
| Model | Input Power (Nominal) | Max Output Torque | Standard Shaft Type |
| B2SH05 | 22-30 kW | 7,800 Nm | Solid / Hollow |
| B2SH06 | 37 kW | 11,000 Nm | Solid Shaft |
| B2SH07 | 45-55 kW | 15,500 Nm | Solid / Hollow |
| B3SH06 | 15-22 kW | 11,500 Nm | (3-Stage for higher ratios) |
Industry Applications
Heavy Conveyor Systems: Main drive units for mining and quarrying.
Industrial Mixing: High-viscosity liquid agitation in chemical plants.
Pulp and Paper: Log handling and feed-roller drives.
Metal Processing: Roller table drives for steel mills.
FAQ
1. Does the 37kW rating refer to the mechanical limit or the motor size?
The 37kW rating is the nominal input power the gearbox can handle at a standard service factor. However, the actual thermal limit may vary depending on ambient temperature and airflow.
2. Is the B2SH06 compatible with older Flender "SZ" series gearboxes?
Yes, the B2SH06 is often used as a direct or near-direct replacement for legacy Flender series, though shaft dimensions and foot-mounting holes should be verified against the current GA drawing.
3. What type of oil is recommended for this solid shaft unit?
High-quality CLP mineral oil (ISO VG 220 or 320) is standard. For extreme temperature environments, we recommend a PAO-based synthetic lubricant.
4. Can this unit be mounted vertically with the shaft pointing down?
Yes, but this requires a "drywell" construction or specialized sealing to prevent oil leakage from the output shaft, along with a modified lubrication schedule.
5. How do I verify the exact ratio for my B2SH06?
The exact ratio ($i$) is stamped on the original Siemens Flender nameplate. If the plate is missing, the ratio can be determined by counting the input vs. output rotations.
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