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[cite: 20]. Combining a high-precision spiral bevel gear input stage with helical gear reduction stages[cite: 20], 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[cite: 20]. Key industrial applications include bucket elevators, heavy belt conveyors, crane hoist drives, ball mill auxiliaries, shredders, and water aerators[cite: 20].
Technical Specifications
| Model / Part Number | B2SH07 (2-Stage Bevel-Helical, Size 07 Frame)[cite: 20] |
|---|---|
| Brand / Manufacturer | Flender GmbH (Siemens AG)[cite: 20] |
| Gear Unit Architecture | 2-Stage (B2), 3-Stage (B3), 4-Stage (B4) Right-Angle Bevel-Helical[cite: 20] |
| Nominal Torque Output | Up to 1,400,000 Nm (Full Series Range Size 03 to 26)[cite: 20] |
| Gear Ratio Range (i) | 5.0 to 450 (Standard Catalog Ratios)[cite: 20] |
| 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)[cite: 20] |
| Housing Construction | Heavy Cast Iron (Horizontal, Vertical, or Upright Floor Mounting)[cite: 20] |
Documentation & Resources
Flender B Series Modular Architecture Matrix
Full-range structural configuration guide for Flender B series right-angle bevel-helical industrial gearboxes[cite: 20]. 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)[cite: 20] | Size 03 to Size 26 (24 Sizes)[cite: 20] | Up to 1,400,000 Nm[cite: 20] | /Fan (Axial Cooling Fan) |
| B3SH / B3HH / B3DH (3-Stage Bevel-Helical)[cite: 20] | Size 04 to Size 26 (23 Sizes)[cite: 20] | Up to 1,400,000 Nm[cite: 20] | /Cool-W (Water/Oil Heat Exchanger) |
| B4SH / B4HH / B4DH (4-Stage Bevel-Helical)[cite: 20] | Size 07 to Size 26 (20 Sizes)[cite: 20] | Up to 1,400,000 Nm[cite: 20] | /Backstop (Mechanical Non-Return) |
| Hollow Shaft Shrink Disc (D Series)[cite: 20] | Size 03 to Size 18[cite: 20] | Up to 300,000 Nm[cite: 20] | /Pump (Forced Pressure Oil Lubrication) |
| Hollow Shaft Splines (K Series)[cite: 20] | Size 05 to Size 16[cite: 20] | Up to 220,000 Nm[cite: 20] | /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[cite: 20]. 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[cite: 20] | 2-Stage Bevel-Helical[cite: 20] | B2SH04 / B2SH05 Current Standard[cite: 20] | Size 04/05 / High Torque Density[cite: 20] | Direct 1-to-1 shaft centerline & footprint match[cite: 20]. |
| Flender B2SH07 / B2SH08[cite: 20] | 2-Stage Bevel-Helical[cite: 20] | B2SH07 / B2SH08 Current Standard[cite: 20] | Size 07/08 / Benchmark Mining Drive[cite: 20] | Identical mounting dimensions & output shaft specs[cite: 20]. |
| Flender B3SH10 / B3SH12[cite: 20] | 3-Stage Bevel-Helical[cite: 20] | B3SH10 / B3SH12 Current Standard[cite: 20] | Size 10/12 / Heavy Conveyor Reducer[cite: 20] | Preserves base bolt pattern & input motor flange[cite: 20]. |
| Flender B4SH14 / B4SH16[cite: 20] | 4-Stage Bevel-Helical[cite: 20] | B4SH14 / B4SH16 Current Standard[cite: 20] | Size 14/16 / High Ratio Industrial Unit[cite: 20] | Drop-in replacement for high-reduction drives[cite: 20]. |
| Legacy Hollow Shaft Units (B..H)[cite: 20] | Hollow Shaft Keyway[cite: 20] | B2DH / B3DH Shrink Disc Modern Clamp[cite: 20] | Size 03 to Size 18[cite: 20] | Shrink disc execution provides 100% fretting-free connection[cite: 20]. |
Expert Selection & Retrofit Engineering Notes
When retrofitting an existing drivetrain featuring older B2SH04, B2SH07, B3SH10, or Siemens Flender gearboxes[cite: 20], choosing original B Series units ensures complete 1-to-1 mechanical interchangeability without modifying foundation steelwork or drive shafts[cite: 20]. 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[cite: 20].
Core Benchmark Model Standard Configurations
- B2SH04[cite: 20]
- B2SH05[cite: 20]
- B2SH06[cite: 20]
- B2SH07[cite: 20]
- B2SH08[cite: 20]
- B2SH09[cite: 20]
- B2SH10[cite: 20]
- B2SH12[cite: 20]
- B3SH08[cite: 20]
- B3SH10[cite: 20]
- B3SH12[cite: 20]
- B3SH14[cite: 20]
- B4SH12[cite: 20]
- B4SH16[cite: 20]
- B2DH07 (Shrink Disc)[cite: 20]
- B3DH08 (Shrink Disc)[cite: 20]
- B2HH07 (Keyway Hollow)[cite: 20]
- B3HH10 (Keyway Hollow)[cite: 20]
- B2KH08 (Splined Shaft)[cite: 20]
- B3KH12 (Splined Shaft)[cite: 20]
