Product Overview
The Flender B3SV10 serves as a dedicated drive solution for mid-to-high capacity bucket elevators. In vertical transport, the gearbox must not only transmit power but also support the axial loads generated by the elevator's internal tension. The "V" in B3SV denotes its specialized vertical configuration, featuring a housing and sealing system optimized for gravity-defying lubrication. With a 37kW power capacity, it offers the mechanical advantage necessary to move bulk materials-such as cement, grain, or minerals-to significant heights. Its compact right-angle design allows the 37kW motor to be positioned horizontally, saving platform space at the head of the elevator.
Technical Parameter Table
| Parameter | Technical Detail |
| Rated Power (P1) | 37 kW |
| Nominal Torque (T2n) | 18,500 Nm |
| Number of Stages | 3 (1 Bevel set + 2 Helical sets) |
| Output Shaft Diameter | 100 mm / 110 mm |
| Efficiency | ≥ 94% |
| Housing Material | Grey Cast Iron (GG25) |
| Cooling Method | Natural Convection (Integrated fan optional) |
Unique Features of the B3SV10
Leak-Proof "Drywell" Sealing: The B3SV10 is equipped with a physical oil-free chamber (Drywell) at the output shaft. This design uses a standing tube to prevent oil from ever reaching the lower seal via gravity, ensuring zero leakage into the bucket elevator casing or the material being transported.
Asymmetric Bearing Load Support: To manage the heavy vertical pull of an elevator belt, the Size 10 housing is fitted with oversized tapered roller bearings at the base. These are specifically arranged to handle the high downward axial thrust that is unique to bucket elevator head-shafts.
Elevator-Specific Lubrication Guttering: Internal cast-in gutters are strategically placed to catch and redirect oil to the top-tier bevel gears. This ensures that even at the moment of start-up, the high-speed input stage is fully lubricated, preventing the "dry-start" wear common in vertical units.
Combined Solutions & Maintenance
The "Elevator Power-Pack"
The B3SV10 is often supplied as part of a modular "Power-Pack" to simplify installation:
Auxiliary Maintenance Drive: The B3SV10 can be fitted with an overrunning clutch and a small secondary motor (inching drive). This allows technicians to move the elevator buckets at extremely slow speeds for inspection or replacement without engaging the 37kW main motor.
Centrifugal Lift-off Backstop: An internal backstop is integrated on the intermediate shaft. It utilizes a lift-off design that ensures no friction or wear during normal operation, yet provides instant mechanical locking if the power fails, preventing the elevator from rolling backward under load.
Standardized Motor Scoops: A rigid steel platform (swing base) is available that bolts directly to the B3SV10, allowing the 37kW motor and gearbox to be shipped as a pre-aligned, single-lift unit.
Related Model Reference Table
| Series Model | Configuration | Typical Ratio | Power Class |
| B3SV10 | Vertical / Solid Shaft | 25 - 112 | 37 kW |
| B3DV10 | Vertical / Hollow Shaft | 25 - 112 | 37 kW |
| B3SV08 | Vertical / Solid Shaft | 25 - 112 | 22 kW |
| B3SV12 | Vertical / Solid Shaft | 25 - 112 | 55 kW |
| B2SV10 | Vertical / 2-Stage | 6.3 - 18 | 45 kW |
Industry Applications
Cement & Aggregates: Vertical transport of raw meal, clinker, and limestone.
Agriculture & Grain: High-capacity elevator drives for silos and grain terminals.
Mining: Raising ore or tailings for processing plant feeders.
Chemicals: Bulk transport of fertilizers and granulated chemicals.
FAQ
Q1: Why is the B3SV model preferred over a standard horizontal B3SH for an elevator?
A1: A standard horizontal gearbox is not designed to handle the lubrication requirements of a vertical shaft. The B3SV10 includes specialized internal oil routing and a Drywell to prevent leaks and ensure bearing longevity in a 90-degree vertical orientation.
Q2: Does the 37kW rating account for the starting torque of a full elevator?
A2: The B3SV10 is rated for 37kW continuous duty. During the selection process, we apply a service factor (typically 1.5 to 2.0) to ensure the internal gearing can handle the peak inertia of a fully loaded bucket system during start-up.
Q3: Can the backstop be serviced without opening the main gearbox?
A3: Yes, the centrifugal backstop is designed as a modular component. It can be accessed via a dedicated cover plate, allowing for inspection or replacement with minimal downtime.
Q4: Is a cooling fan necessary for this 37kW model?
A4: In many indoor environments, the B3SV10's large surface area allows for sufficient natural cooling. However, if the elevator is located in a high-temperature outdoor silo environment, an integrated mechanical fan on the input shaft is recommended.
Q5: What type of oil is required for this vertical unit?
A5: High-performance synthetic gear oil (ISO VG 320 or 460) is recommended. Synthetic oil provides better film strength at slow output speeds and maintains its viscosity longer in the high-heat conditions common at the top of elevator towers.
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