Product Overview
The Flender B3DH08 is a cornerstone of modular drive technology, specifically designed to handle the torque requirements of mid-range industrial machinery. The "H" designation refers to its hollow shaft configuration, which is paired with a high-precision shrink disk. This combination allows the unit to be mounted directly onto the driven machine shaft, eliminating the need for expensive and maintenance-heavy flexible couplings. With a 15kW power capacity, the B3DH08 offers a robust solution for operations that require slow, controlled, and powerful rotation, such as heavy-duty mixers and belt feeders.
Technical Parameter Table
| Parameter | Detailed Specification |
| Rated Power (P1) | 15 kW |
| Nominal Torque (T2n) | 11,800 Nm |
| Gear Stages | 3 (1 Bevel Stage + 2 Helical Stages) |
| Hollow Shaft Bore | 80mm / 90mm (Standard options) |
| Efficiency | > 94% (High energy-saving class) |
| Housing Material | Grey Cast Iron GG25 (Vibration damping) |
| Lubrication | Splash lubrication (Standard) |
Unique Features of the B3DH08
Backlash-Free Shrink Disk Connection: The B3DH08 utilizes a specialized external clamping mechanism that creates a high-pressure friction fit. This eliminates the "keyway wallowing" commonly found in 15kW reversing loads, ensuring the integrity of the machine shaft over decades of use.
Precision-Lapped Bevel Gears: Unlike mass-market units, the B3DH08 bevel stage is lapped in pairs. This unique process ensures an optimized tooth contact pattern that reduces noise and heat generation, allowing for higher thermal limits without external cooling.
Extended Bearing Distance (EBD): The internal bearing arrangement in the Size 08 frame is specifically spaced to handle significant overhung loads, making it exceptionally stable for shaft-mounted applications where the gearbox "hangs" on the driven equipment.
Installation & Shaft Mounting Solutions
Direct Drive Integration
The B3DH08 is designed to simplify your plant layout through modular mounting options:
Reaction Torque Support: We provide a specialized torque arm with integrated elastomer bushings. This setup absorbs the peak start-up torque from the 15kW motor, preventing stress fractures in the machine framework.
Protective Covers: For safety and longevity, the shrink disk side of the B3DH08 is fitted with a stainless-steel cover, protecting the clamping bolts from corrosion and preventing accidental contact during rotation.
Removal Assistance: The hollow shaft is pre-machined with threaded holes to facilitate the use of hydraulic removal tools, ensuring that maintenance stays on schedule without damaging the equipment.
Related Model Reference Table
| Model Series | Power Rating | Shaft Type | Mounting Configuration |
| B3DH08 | 15 kW | Hollow Shaft + Shrink Disk | Shaft Mounted |
| B3SH08 | 15 kW | Solid Shaft | Foot Mounted |
| B3DH07 | 11 kW | Hollow Shaft + Shrink Disk | Shaft Mounted |
| B3DH09 | 22 kW | Hollow Shaft + Shrink Disk | Heavy Duty |
| B2DH08 | 18.5 kW | Hollow Shaft (2-Stage) | High Speed / Low Ratio |
Industry Applications
Waste Water Treatment: High-torque drives for thickeners and sludge scrapers.
Chemical Processing: Drive units for large-scale industrial blending tanks.
Material Handling: Head drives for inclined belt conveyors and bucket elevators.
Food Production: Industrial-scale kneading and dough mixing machines.
FAQ
Q1: What are the advantages of a shrink disk over a parallel keyway?
A1: A shrink disk provides a 360-degree friction lock. This eliminates the stress concentration of a keyway, prevents fretting corrosion, and makes the gearbox much easier to remove after long periods of service.
Q2: Does the 15kW B3DH08 require an external oil cooler?
A2: In standard ambient temperatures (up to 40°C), the high efficiency of the 3-stage B3DH08 allows for natural convection cooling. For higher heat environments, an optional shaft-driven fan can be added.
Q3: Can I mount the shrink disk on either side of the gearbox?
A3: The B3DH08 is designed with a specific hollow shaft extension for the shrink disk. While it is usually factory-set to one side, we can provide symmetric or mirrored configurations upon request.
Q4: Is this gearbox suitable for frequency inverter (VFD) control?
A4: Yes. The gearing and lubrication system are designed to handle the variable speeds and torque curves associated with 15kW VFD-driven motors.
Q5: What is the maintenance interval for the lubricant?
A5: For standard mineral oil, we recommend a change every 10,000 operating hours. For synthetic oils, this interval can be extended to 20,000 hours, depending on the average operating temperature.
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