Product Overview
The Flender H1SH11 represents a significant jump in load-bearing capacity within the H-series lineup. For paper mill operators, reliability is measured by the gearbox's ability to run 24/7 without unplanned stops. The H1SH11 utilizes high-grade alloy steel gears that are case-hardened and ground to achieve a superior surface finish. This reduces friction and heat generation, which is critical when handling a 315kW input. The robust housing design provides excellent torsional stiffness, maintaining precise gear alignment even under heavy overhung loads common in dryer sections or pulper drives.
Product parameters
| Parameter | Specification |
| Rated Input Power | 315 kW |
| Input Speed | 750 / 1000 / 1500 RPM |
| Shaft Height | 355 mm |
| Output Shaft Diameter | 110 mm / 120 mm (Customizable) |
| Lubrication Type | Forced Lubrication (Integrated or External Pump) |
| Seal System | Taconite / Labyrinth Seals (Paper Mill Standard) |
| Dry Weight | Approx. 1,150 kg |
Exclusive Performance Traits
Mill-Specific Sealing Integrity: The H1SH11 for paper mills is equipped with specialized Taconite seals. These multi-stage seals prevent the ingress of fine paper dust and moisture, which typically compromises standard industrial units.
Optimized Thermal Capacity for Humidity: The internal oil flow paths in the size 11 housing are expanded to facilitate faster heat exchange, preventing oil oxidation in the high-ambient-humidity conditions of a paper production line.
High-Shock Load Resistance: The gear tooth profile is designed with a specific "tip relief" modification, allowing the unit to absorb the torque fluctuations inherent in heavy pulp processing without micro-pitting.
Component Architecture & System Flexibility
The H1SH11 is designed as a "bridge" component between high-speed motors and low-speed mill machinery. Its modular architecture allows for the easy addition of backstops or auxiliary drives (inching drives) for maintenance rotations. The internal spherical roller bearings are sourced from premium tiers to ensure they can handle the radial forces of heavy belt or chain drives if the unit is not directly coupled.
Comparative Model Selection Table
| Related Model | Housing Size | Power Range | Configuration |
| H1SH09 | Size 09 | 200kW - 250kW | Parallel Shaft |
| H1SH11 | Size 11 | 280kW - 315kW | Parallel Shaft |
| H2SH11 | Size 11 | 160kW - 200kW | Two-Stage (High Ratio) |
| B1SH11 | Size 11 | 250kW - 300kW | Bevel-Helical (Right Angle) |
Primary Industrial Applications
Pulper Drives: Managing high-consistency pulp batches.
Dryer Sections: Continuous torque for large-diameter drying cylinders.
Refiners: Precision speed control for fiber processing.
Calender Stacks: Reliable power for finishing rollers.
FAQ
Q: Is the H1SH11 suitable for 24/7 operation in high-heat zones?
A: Yes. The H1SH11 is rated for continuous S1 duty. For dryer sections where ambient temperatures are elevated, we recommend an external oil-to-water cooling system to maintain optimal oil viscosity.
Q: Can we use synthetic oil in this unit?
A: Absolutely. While mineral oil is standard, synthetic lubricants (PAO) are highly recommended for the H1SH11 in 315kW applications to extend oil change intervals and improve thermal stability.
Q: What maintenance is required for the Taconite seals?
A: In a paper mill environment, we suggest regreasing the grease-filled labyrinth seals every 3 to 6 months to ensure a fresh barrier against contaminants.
Q: Does this model support condition monitoring?
A: Yes. The H1SH11 includes pre-drilled tapping points for vibration sensors and oil temperature probes, allowing for integration into your mill's predictive maintenance system.
Q: Can the shaft dimensions be modified to match an existing pulper?
A: We offer standard metric shaft sizes, but custom diameters and lengths can be engineered to ensure a direct drop-in replacement for older Flender or third-party gearboxes.
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