Product Overview
The Flender B4SH15 is specifically configured for the arduous duty cycles of bucket elevators in the cement, grain, and mining industries. Moving heavy bulk materials vertically requires immense starting torque and a drive system that can operate at very low speeds without overheating. The B4SH15 utilizes a 4-stage reduction process to transform a 45kW input into over 65,000 Nm of torque. Its right-angle design allows the motor to be positioned parallel to the elevator casing, significantly reducing the footprint of the drive platform. Built with high-grade cast iron and precision-ground gears, this unit ensures reliable, continuous operation in the most dust-laden environments.
Technical Parameter Table
| Parameter | Technical Detail |
| Rated Power (P1) | 45 kW |
| Nominal Torque (T2n) | 68,000 Nm |
| Number of Stages | 4 (1 Bevel set + 3 Helical sets) |
| Standard Ratios (in) | 100, 125, 160, 200, 250, 315, 400 |
| Output Shaft Diameter | 160mm / 170mm / 180mm |
| Housing Grade | GG25 High-Strength Cast Iron |
| Lubrication System | Splash lubrication with internal distribution gutters |
Unique Features of the B4SH15
Dedicated Bucket Elevator Housing: The B4SH15 features a reinforced housing base specifically designed to counteract the high overhung loads and vertical reaction forces typical of tensioned elevator belts.
Integrated Centrifugal Lift-Off Backstop: Unlike standard industrial gearboxes, the B4SH15 is often fitted with a high-capacity backstop on the intermediate shaft. This "lift-off" design ensures zero wear during normal operation while providing instantaneous mechanical locking to prevent the elevator from falling backward under load during a power failure.
Optimized High-Ratio Thermal Path: Because 4-stage units generate localized heat in the high-speed bevel stage, the B4SH15 includes a proprietary internal oil-guiding system that forces cooler oil from the sump directly onto the bevel mesh, extending the service life of the gear flanks.
Combined Solutions & Maintenance
The "Elevator Drive Package"
The B4SH15 is most effective when deployed as part of a synchronized drive system:
Auxiliary "Inching" Drives: For maintenance and belt replacement, the B4SH15 can be equipped with an auxiliary motor and an overrunning clutch. This allows the elevator to be moved at extremely slow speeds (inching) without engaging the main 45kW motor.
Fluid Coupling Protection: To manage the massive starting inertia of a fully loaded bucket elevator, we recommend pairing the B4SH15 with a Flender FLUDEX coupling. This ensures a soft start and protects the gear teeth from peak torque spikes.
Taconite Sealing System: Given the dusty nature of bulk handling, the B4SH15 utilizes regreasable Taconite labyrinth seals to prevent abrasive particles from reaching the internal bearings.
Related Model Reference Table
| Model Series | Configuration | Power Class | Typical Application |
| B4SH15 | 4-Stage / Solid Shaft | 45 kW | Large Bucket Elevators |
| B4DH15 | 4-Stage / Hollow Shaft | 45 kW | Shaft-Mounted Feeders |
| B4SH13 | 4-Stage / Solid Shaft | 30 kW | Medium Elevators |
| B3SH15 | 3-Stage / Solid Shaft | 250 kW | High-Speed Conveyors |
| B4SH16 | 4-Stage / Solid Shaft | 55 kW | Heavy Mineral Processing |
Industry Applications
Cement Industry: Raw meal and clinker bucket elevators.
Grain & Agriculture: High-capacity silo feeding systems.
Mining: Vertical ore transport and processing plant feed systems.
Chemicals: Fertilizer transport and bulk chemical handling.
FAQ
Q1: Why is a 4-stage gearbox necessary for a bucket elevator?
A1: Bucket elevators move massive weights at very slow vertical speeds. A 4-stage unit like the B4SH15 provides the extremely high reduction ratios (up to 400:1) needed to generate the required torque from a standard 45kW motor.
Q2: How does the backstop function in the B4SH15?
A2: The backstop is an internal mechanical clutch that allows rotation in only one direction. In the B4SH15, it uses "lift-off" sprags that don't touch the housing during operation, ensuring no friction or wear until the shaft tries to reverse.
Q3: Can the B4SH15 handle the dust found in cement plants?
A3: Yes. With the optional Taconite seal package, the gearbox is hermetically protected against fine dust ingress, which is the leading cause of bearing failure in the cement industry.
Q4: Is an auxiliary drive always required?
A4: While not mandatory, an auxiliary drive is highly recommended for elevators of this size. It allows for safe maintenance and inspection of the buckets and belt at a fraction of the normal operating speed.
Q5: What type of oil should be used?
A5: For heavy-duty 45kW loads, a high-quality synthetic gear oil (ISO VG 320 or 460) is recommended to ensure film strength at the slow output speeds and high pressures found in the final reduction stage.
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