Product Overview
The Flender B3HH07 serves as the backbone for medium-duty conveyor drives. The "H" designation highlights its hollow shaft design, which allows the gearbox to be mounted directly onto the conveyor's head pulley shaft, eliminating the need for alignment-sensitive couplings and bulky baseplates. By utilizing a 3-stage reduction process, the B3HH07 converts an 11kW input into massive driving force at low speeds, ensuring smooth start-ups for fully loaded belts. Its housing is optimized for high thermal capacity, ensuring that even under 24/7 operation, the internal components remain within safe temperature limits.
Technical Parameter Table
| Parameter | Detailed Specification |
| Rated Power (P1) | 11 kW |
| Nominal Torque (T2n) | 6,500 Nm |
| Number of Stages | 3 (1 Bevel set + 2 Helical sets) |
| Hollow Shaft Diameter | 70mm / 80mm / 85mm (Customizable) |
| Standard Sealing | NBR Oil Seals (Optional Viton for high heat) |
| Cooling | Natural Convection (Optional cooling fan) |
| Housing Material | Grey Cast Iron (Standard) |
Unique Features of the B3HH07
Conveyor-Specific Housing Geometry: The B3HH07 features a reinforced "ribbed" casting specifically designed to absorb the reaction forces of conveyor belt tension, preventing housing "flex" which can lead to premature gear wear.
Integrated Shrink Disk Interface: This model utilizes a high-precision tapered shrink disk on the hollow shaft. This creates a zero-backlash, heavy-duty mechanical shrink fit that is significantly more reliable than standard keyways in reversing conveyor applications.
High-Efficiency Spiral Bevel Set: Unlike standard bevel gears, the Size 07 uses a proprietary Flender grinding method on the spiral bevel stage, resulting in a 97% efficiency rate for that stage alone-critical for reducing energy costs in large-scale conveyor plants.
Installation & Modular Solutions
Shaft-Mounting & Torque Support
The B3HH07 is designed to "ride" on the machine shaft. To facilitate this, we offer:
Standard Torque Arm: A heavy-duty, bolt-on torque arm with rubber buffering to absorb the start-up kick of the 11kW motor, protecting both the gearbox and the conveyor framework.
Motor Scoop (Swing Base): A rigid steel platform that attaches to the gearbox, allowing the motor to sit directly above the unit. This creates a self-contained "Power Pack" that moves with the conveyor shaft.
Backstop Module: An internal, centrifugal lift-off backstop can be integrated. This is a crucial safety feature for inclined conveyors, preventing the belt from rolling backward during power failures.
Related Model Reference Table
| Model Series | Configuration | Shaft Type | Typical Industry |
| B3HH07 | 3-Stage / Right Angle | Hollow Shaft | Belt Conveyors |
| B3SH07 | 3-Stage / Right Angle | Solid Shaft | Screw Conveyors |
| B3HH06 | 3-Stage / Right Angle | Hollow Shaft | Light Packaging Lines |
| B3HH08 | 3-Stage / Right Angle | Hollow Shaft | Heavy Mining Feeders |
| B2HH07 | 2-Stage / Right Angle | Hollow Shaft | High-Speed Sorting |
Industry Applications
Mining & Aggregates: Underground and overland belt conveyors.
Agriculture: Grain elevator drives and bulk feed transport.
Cement Plants: Clinker transport and bagging area conveyors.
Logistics: High-capacity sorting systems and pallet transfers.
FAQ
Q1: Why choose a 3-stage (B3) over a 2-stage (B2) for my conveyor?
A1: Conveyors typically require slow belt speeds. The 3-stage B3HH07 provides higher reduction ratios (up to 112:1), allowing you to reach these slow speeds without using excessively large pulleys or external chain drives.
Q2: What is the benefit of the hollow shaft "H" design?
A2: It saves space and money. You don't need a low-speed coupling or a large mounting base. The gearbox is supported by the conveyor shaft itself, which naturally compensates for small amounts of shaft misalignment.
Q3: Can the B3HH07 be installed outdoors?
A3: Absolutely. When ordered with the "Outdoor Package," it includes a breather with a moisture filter, Taconite seals to keep out dust/grit, and a special C3-grade epoxy paint.
Q4: Is the 11kW rating fixed?
A4: 11kW is the standard rating for typical conveyor duty cycles (Service Factor 1.5). If your application is very smooth or intermittent, the thermal capacity may allow for slightly higher input, but this must be verified by a technical data sheet.
Q5: Does it require a separate oil pump?
A5: No. The B3HH07 is designed for splash lubrication. As long as it is mounted horizontally, the gears distribute the oil effectively to all bearings.
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