Product Overview
The Flender H3SH18 is a cornerstone in large-scale industrial drives, bridging the gap between standard gearboxes and custom-engineered mill drives. Rated for 315kW, it utilizes a triple-reduction helical gear train to achieve high transmission ratios while maintaining energy efficiency levels exceeding 94%. The H3SH18 housing is cast from high-grade nodular iron, specifically designed to dampen vibration and resist the torsional stresses found in primary crushing, mining, and bulk material handling. Every gear set is case-hardened and precision-ground, ensuring a perfect contact pattern and a significant reduction in operational noise.
Technical Parameter Table
| Parameter | Specification Detail |
| Rated Input Power (Pn) | 315 kW |
| Nominal Torque (T2n) | 250,000 Nm |
| Number of Reduction Stages | 3 Stages |
| Standard Output Shaft Dia. | 240 mm / 260 mm |
| Input Shaft Diameter | 100 mm / 110 mm |
| Gear Surface Hardness | 58-62 HRC |
| Cooling Method | Natural Convection (Optional Fan/Cooler) |
| Total Unit Weight | Approx. 4,850 kg |
H3SH18 Specific Highlights
High-Capacity Torsion Resistance: The Size 18 housing is engineered with an advanced cross-ribbing architecture. This design prevents casing deflection under the extreme 250,000 Nm torque loads, ensuring that internal gear alignments remain precise even during peak load fluctuations.
Triple-Stage Thermal Dispersion: By utilizing three stages to distribute the 315kW energy throughput, the H3SH18 maximizes internal surface contact with the oil, effectively dissipating frictional heat without the immediate need for external cooling systems in many climates.
Precision Profile Correction: The helical gear teeth feature specialized "K-profile" grinding. This micro-correction compensates for the natural bending of shafts under 315kW loads, guaranteeing a full-face contact pattern and preventing edge-loading wear.
Installation Solutions & Integrated Accessories
Shaft Alignment & Coupling Integration
For a 315kW transmission system, alignment is critical. The H3SH18 is typically paired with Flender ARPEX all-steel couplings or FLUDEX fluid couplings. These components allow for a cushioned start-up, protecting the triple-reduction gear teeth from the high starting torque of large electric motors.
Monitoring & Protective Sensors
To ensure 24/7 uptime in critical infrastructure, the H3SH18 is equipped with:
- Dual Bearing Temperature Ports: Pre-machined for PT100 sensors on both the input and output bearing seats.
- Vibration Monitoring Pads: Flat-machined surfaces on the housing for easy mounting of accelerometers.
- Oil Level & Quality Switch: An optional electrical switch that triggers an alarm if lubricant levels drop or if moisture is detected in the sump.
Related Model Reference Table
| Model Variant | Nominal Power | Shaft Type | Application Level |
| H3SH16 | 200-250 kW | Solid Shaft | Standard Heavy Duty |
| H3DH18 | 315 kW | Hollow Shaft | Shaft-Mounted Drive |
| B3SH18 | 315 kW | Right-Angle | Perpendicular Feeders |
| H3SH19 | 400-450 kW | Solid Shaft | Extreme Processing |
Industry Applications
Mining & Aggregates: Main drive for primary overland conveyors and high-capacity reclaimers.
Steel Production: Driving units for continuous casting plants and heavy-duty rolling mills.
Bulk Terminals: Primary power for ship loaders and massive bucket wheel excavators.
Cement Industry: Reliability-focused drives for rotary kilns and large-scale separators.
FAQ
1. Is a 315kW rating the absolute limit for the H3SH18?
315kW is the nominal rating. The actual permissible power is determined by your specific application's service factor and the required transmission ratio. We provide custom calculations to ensure the gearbox is perfectly sized for your duty cycle.
2. Does the H3SH18 require a forced lubrication system?
For most horizontal applications, splash lubrication is sufficient. However, if the gearbox is used with a VFD at very low speeds or installed at an incline, a motor-driven oil pump is recommended to protect the upper bearings.
3. What is the benefit of the triple-reduction (H3) design for this power class?
The H3SH18 allows you to achieve very high reduction ratios (up to 112:1) while maintaining higher mechanical efficiency and durability than a single or double reduction unit of similar size would provide at such low speeds.
4. How is the H3SH18 protected against abrasive industrial dust?
The unit can be fitted with Taconite labyrinth seals. These seals include a grease-purged barrier that physically blocks dust, grit, and moisture from reaching the internal oil seals and gears.
5. What type of oil should be used in an H3SH18 gearbox?
High-quality mineral oil (ISO VG 220 or 320) is standard. For extreme temperatures or to extend oil change intervals, we strongly recommend synthetic PAO lubricants.
6. Can a backstop be retrofitted to the H3SH18?
Yes. The H3SH18 is designed to accommodate an internal, maintenance-free backstop that prevents reverse rotation, which is essential for inclined conveyor safety.
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