Flender B2SH07 Industrial Bevel-Helical Gearbox
The Flender B2SH07 is a benchmark 2-stage right-angle bevel-helical industrial gearbox engineered for space-saving mounting, high operational reliability, and maximum torque density. Combining a high-precision spiral bevel gear input stage with helical gear reduction stages, the Flender B series is available in 2, 3, and 4-stage layouts (B2, B3, B4) covering sizes 03 through 26 with nominal torques up to 1,400,000 Nm. Key industrial applications include bucket elevators, heavy belt conveyors, crane hoist drives, ball mill auxiliaries, shredders, and water aerators.
Technical Specifications
| Model / Part Number | B2SH07 (2-Stage Bevel-Helical, Size 07 Frame) |
|---|---|
| Brand / Manufacturer | Flender GmbH (Siemens AG) |
| Gear Unit Architecture | 2-Stage (B2), 3-Stage (B3), 4-Stage (B4) Right-Angle Bevel-Helical |
| Nominal Torque Output | Up to 1,400,000 Nm (Full Series Range Size 03 to 26) |
| Gear Ratio Range (i) | 5.0 to 450 (Standard Catalog Ratios) |
| Output Shaft Execution | Solid Shaft with Parallel Key (S/H), Hollow Shaft with Shrink Disc (D), Hollow Shaft with Keyway (H/A), Splined Hollow Shaft (K) |
| Housing Construction | Heavy Cast Iron (Horizontal, Vertical, or Upright Floor Mounting) |
Documentation & Resources
Flender B Series Modular Architecture Matrix
Full-range structural configuration guide for Flender B series right-angle bevel-helical industrial gearboxes. Review supported reduction stages, shaft executions, mounting layouts, and cooling packages:
| Gear Unit Layout & Stage Designation | Frame Sizes Covered | Nominal Torque Output (Nm) | Standard Factory Accessories & Cooling |
|---|---|---|---|
| B2SH / B2HH / B2DH (2-Stage Bevel-Helical) | Size 03 to Size 26 (24 Sizes) | Up to 1,400,000 Nm | /Fan (Axial Cooling Fan) |
| B3SH / B3HH / B3DH (3-Stage Bevel-Helical) | Size 04 to Size 26 (23 Sizes) | Up to 1,400,000 Nm | /Cool-W (Water/Oil Heat Exchanger) |
| B4SH / B4HH / B4DH (4-Stage Bevel-Helical) | Size 07 to Size 26 (20 Sizes) | Up to 1,400,000 Nm | /Backstop (Mechanical Non-Return) |
| Hollow Shaft Shrink Disc (D Series) | Size 03 to Size 18 | Up to 300,000 Nm | /Pump (Forced Pressure Oil Lubrication) |
| Hollow Shaft Splines (K Series) | Size 05 to Size 16 | Up to 220,000 Nm | /Heater (Oil Sump Heating Element) |
Legacy Flender Gearbox Replacement & B Series Upgrade Guide
Obsolete Flender or Siemens gear units installed on industrial drivetrains can be directly replaced with current B Series right-angle gearboxes. Refer to the cross-reference mapping below for 1-to-1 retrofitting:
| Legacy Flender Gearbox Model | Original Gear Unit Type | Current B Series Equivalent | Frame Size & Torque Capacity | Mechanical Fit & Retrofit Engineering Notes |
|---|---|---|---|---|
| Flender B2SH04 / B2SH05 | 2-Stage Bevel-Helical | B2SH04 / B2SH05 Current Standard | Size 04/05 / High Torque Density | Direct 1-to-1 shaft centerline & footprint match. |
| Flender B2SH07 / B2SH08 | 2-Stage Bevel-Helical | B2SH07 / B2SH08 Current Standard | Size 07/08 / Benchmark Mining Drive | Identical mounting dimensions & output shaft specs. |
| Flender B3SH10 / B3SH12 | 3-Stage Bevel-Helical | B3SH10 / B3SH12 Current Standard | Size 10/12 / Heavy Conveyor Reducer | Preserves base bolt pattern & input motor flange. |
| Flender B4SH14 / B4SH16 | 4-Stage Bevel-Helical | B4SH14 / B4SH16 Current Standard | Size 14/16 / High Ratio Industrial Unit | Drop-in replacement for high-reduction drives. |
| Legacy Hollow Shaft Units (B..H) | Hollow Shaft Keyway | B2DH / B3DH Shrink Disc Modern Clamp | Size 03 to Size 18 | Shrink disc execution provides 100% fretting-free connection. |
Expert Selection & Retrofit Engineering Notes
When retrofitting an existing drivetrain featuring older B2SH04, B2SH07, B3SH10, or Siemens Flender gearboxes, choosing original B Series units ensures complete 1-to-1 mechanical interchangeability without modifying foundation steelwork or drive shafts. Simply supply us with your existing Flender serial number or nameplate data, and our engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- B2SH04
- B2SH05
- B2SH06
- B2SH07
- B2SH08
- B2SH09
- B2SH10
- B2SH12
- B3SH08
- B3SH10
- B3SH12
- B3SH14
- B4SH12
- B4SH16
- B2DH07 (Shrink Disc)
- B3DH08 (Shrink Disc)
- B2HH07 (Keyway Hollow)
- B3HH10 (Keyway Hollow)
- B2KH08 (Splined Shaft)
- B3KH12 (Splined Shaft)
