Overview & Designation Matrix
Explore heavy-duty engineering designs and modular options for FLENDER® Helical H Series & Bevel-Helical B Series gear units. Full technical interchangeability supported by WeDrive Power Transmission.
Target Industries & Field Applications
Our heavy-duty FLENDER Industrial Gear Units are engineered specifically for severe operational environments. This versatile, time-tested design delivers exceptional reliability across continuous process applications, running seamlessly from high-torque mineral crushing to precision port lifting machinery.
The engineering data above outlines the standard dimensions for FLENDER gearboxes. It provides crucial sizing benchmarks covering specific torque outputs and ratio selections across various casing footprints.
FLENDER DESIGNS AND SIZES - Technical Specifications
| Gear Unit Type | Nominal Torque Class T2N (Nm) | Ratio Range (i) |
|---|---|---|
| Helical Gear Unit H1 | 3,300 - 75,700 Nm | 1.25 - 5.6 |
| Helical Gear Unit H2 | 3,500 - 107,000 Nm | 6.3 - 28 |
| Helical Gear Unit H3 | 11,600 - 109,000 Nm | 22.4 - 112 |
| Helical Gear Unit H4 | 21,700 - 113,000 Nm | 100 - 450 |
| Bevel-helical B2 | 6,200 - 101,000 Nm | 5 - 22.4 |
| Bevel-helical B3 | 3,600 - 113,000 Nm | 12.5 - 90 |
| Bevel-helical B4 | 11,600 - 113,000 Nm | 80 - 400 |
* Note: Nominal torque and ratio ranges are based on standard FLENDER industrial configurations.
The chart below exhibits the maximum torque capacities for multi-stage gear transmission setups. For customized thermal capacities or special forced lubrication options, consult WeDrive engineering teams directly.
| Type | Size Range | Nominal Torque T2N (Nm) | Ratio Range (i) |
|---|---|---|---|
| H1.. (Single-stage) | 03 - 19 | 3,300 - 245,000 Nm | 1.25 - 5.6 |
| H2.. (Two-stage) | 03 - 28 | 3,500 - 1,400,000 Nm | 6.3 - 28 |
| H3.. (Three-stage) | 05 - 28 | 11,600 - 1,400,000 Nm | 22.4 - 112 |
| H4.. (Four-stage) | 07 - 28 | 21,700 - 1,400,000 Nm | 100 - 450 |
| B2.. (Two-stage) | 04 - 18 | 6,200 - 230,000 Nm | 5 - 22.4 |
| B3.. (Three-stage) | 03 - 28 | 3,600 - 1,400,000 Nm | 12.5 - 90 |
| B4.. (Four-stage) | 05 - 28 | 11,600 - 1,400,000 Nm | 80 - 400 |
Understanding the exact nomenclature parameters ensures perfect fitments during part number replication or plant replacement procurement cycles.
Structure of Gear Unit Designation (Example: B3SH11A16)
- B: Bevel-helical gear units
- 3: No. of stages (3 stages)
- S: Solid shaft with parallel key
- H: Horizontal mounting position
- 11: Gear unit size identifier
- A: Structural Version A
- 16: Nominal Ratio i = 16
FLENDER Gearbox Model Designation & Structure Nomenclature
Comprehensive selection guide for FLENDER helical gear units, bevel helical gearmotors, and industrial speed reducers.
1. Industrial FLENDER Gearbox Types & Specifications
FLENDER Helical Gear Units (Types H1, H2, H3, H4)
- Transmission Stages: 1-stage, 2-stage, 3-stage, 4-stage helical gear reducer
- Nominal Ratio Range ($i_N$): $1.25 \dots 450$
- Application: Heavy-duty parallel shaft speed reducer for industrial conveyers, pumps, and geared motor drives.
FLENDER Bevel Helical Gear Units (Types B2, B3, B4)
- Transmission Stages: 2-stage, 3-stage, 4-stage right-angle gear unit
- Nominal Ratio Range ($i_N$): $5.6 \dots 400$
- Application: High-torque right-angle geared motor and speed reducer drives for crushers, mixers, and bucket elevators.
2. Structure of FLENDER Gear Unit Designation Code
| Parameter | Technical Description | Code | Example Code |
|---|---|---|---|
| Type | Helical gear units (Parallel Shaft) | H | B |
| Bevel helical gear units (Right Angle) | B | ||
| No. of Stages | 1, 2, 3, or 4 Reduction Stages | 1, 2, 3, 4 | 3 |
| Design of Low Speed Shaft (LSS) | Solid shaft with parallel key acc. to DIN 6885/1 | S | S |
| Solid shaft with parallel key acc. to DIN 6885/1 with reinforced spigot | V | ||
| Solid shaft without parallel key | C | ||
| Hollow shaft with keyway acc. to DIN 6885/1 | H | ||
| Hollow shaft with shrink disk | D | ||
| Hollow shaft with spline acc. to DIN 5480 | K | ||
| Flanged shaft | F | ||
| Mounting Position | Horizontal Mounting Position | H | H |
| Vertical Mounting Position | V | ||
| Upright, low speed shaft (LSS) bottom | H | ||
| Upright, low speed shaft (LSS) top | H | ||
| Gear Unit Size | Frame Size: 03, 04, 05, ... up to 27, 28 | 03 ... 28 | 11 |
Example Model Breakdown: FLENDER B3SH11A16 Gearbox
When ordering or requesting technical quotation for FLENDER industrial gearboxes, geared motors, and speed reducers, the model designation specifies exact engineering characteristics:
- B: Bevel Helical Gear Unit (Right Angle Shaft Configuration)
- 3: 3-Stage Gear Reduction System
- S: Low Speed Output Shaft in Solid Shaft Design with Parallel Key (DIN 6885/1)
- H: Horizontal Mounting Position
- 11: Gear Unit Frame Size 11
- A: Standard Version Design / Assembly Arrangement
- 16: Exact Gear Transmission Ratio ($i = 16$)
Further Ordering Details Required for Complete Quotation:
- Exact Transmission Gear Ratio ($i$)
- Shaft Execution and Arrangement Design (Shaft A, B, C, D, etc.)
- Motor Adapter / Motor Flange Connection Specs for Geared Motor Assembly
Above detailed configuration covers specialized high-ratio co-axial drives. WeDrive offers full interchangeability components matching genuine industrial footprint profiles accurately.
Detailed transmission limits for FLENDER flexible shaft couplings. Proper coupling configuration eliminates shaft misalignment stresses and cushions severe shock loads within driving linkages.
FLENDER Industrial Couplings Portfolio & Technical Specifications
Comprehensive selection guide for FLENDER flexible, torsionally rigid, hydrodynamic fluid, and highly-flexible shaft couplings.
Flexible Couplings
Our elastic couplings are pluggable and easy to install. The elastomer element equalizes the shaft offset and absorbs impacts from the motor or driven machine.
Key Series: N-EUPEX, RUPEX pin & bush couplings.
Torsionally Rigid Couplings
Our compact steel couplings provide extremely precise transmission of high torques, especially in harsh operating conditions and extreme temperatures.
Key Series: ARPEX all-steel disc couplings, ZAPEX gear couplings.
Hydrodynamic Couplings
Soft start, overload protection, torsional vibration damping – FLUDEX® fluid couplings allow the torque-limited approach and have very little slippage at rated load.
Key Series: FLUDEX® fluid couplings for conveyor & mill drives.
Highly-Flexible Couplings
Highly flexible couplings are well-suited for connecting machines that operate asymmetrically. They are preferred for use in systems that are periodically operated.
Key Series: ELPEX, ELPEX-B, ELPEX-S rubber couplings.
FLENDER Couplings Quick Selection Table
| Coupling Category | Core Functional Advantage | Torque / Power Range |
|---|---|---|
| Flexible Couplings | Pluggable, shaft offset compensation, impact absorption | 12 Nm ... 1,300,000 Nm |
| Torsionally Rigid Couplings | Precise transmission, extreme temperatures & harsh conditions | 5 Nm ... 10,000,000 Nm |
| Hydrodynamic Couplings | FLUDEX® soft start, overload protection, low slippage | 1.2 kW ... 2,500 kW |
| Highly-Flexible Couplings | Asymmetric operation, periodically operated drive systems | 24 Nm ... 90,000 Nm |
The structural matrix above illustrates technical boundaries for heavy-duty all-steel disc couplings, ensuring premium backlash-free torque consistency across synchronous operating systems.
FLENDER Flexible & Highly-Flexible Shaft Couplings Series Overview
Detailed specifications and nominal output torque ratings for FLENDER N-EUPEX, RUPEX, N-BIPEX, ELPEX, ELPEX-B, and ELPEX-S industrial couplings.
Flexible Couplings (N-EUPEX, RUPEX and N-BIPEX)
Flexible Flender couplings are pluggable and easy to install. The elastomer element equalizes the shaft offset and absorbs impacts from the motor or driven machine.
N-EUPEX Cam Couplings
Nominal Output Torque: 19 Nm ... 62,000 Nm
RUPEX Pin-and-Bush Couplings
Nominal Output Torque: 200 Nm ... 1,300,000 Nm
N-BIPEX Cam Couplings
Nominal Output Torque: 12 Nm ... 4,650 Nm
Highly-flexible Couplings (ELPEX, ELPEX-B and ELPEX-S)
Highly-flexible Flender couplings are well-suited for connecting machines that operate asymmetrically. They are preferred for use in systems that are periodically operated.
ELPEX Elastic Ring Couplings
Nominal Output Torque: 1,600 Nm ... 90,000 Nm
ELPEX-B Elastic Tire Couplings
Nominal Output Torque: 24 Nm ... 14,500 Nm
ELPEX-S Rubber Disk Couplings
Nominal Output Torque: 330 Nm ... 63,000 Nm
FLENDER Couplings Model & Torque Technical Data Sheet
| Model Series | Coupling Design Type | Category | Nominal Output Torque Range |
|---|---|---|---|
| N-EUPEX | Cam Couplings | Flexible Coupling | 19 Nm ... 62,000 Nm |
| RUPEX | Pin-and-Bush Couplings | Flexible Coupling | 200 Nm ... 1,300,000 Nm |
| N-BIPEX | Cam Couplings | Flexible Coupling | 12 Nm ... 4,650 Nm |
| ELPEX | Elastic Ring Couplings | Highly-Flexible Coupling | 1,600 Nm ... 90,000 Nm |
| ELPEX-B | Elastic Tire Couplings | Highly-Flexible Coupling | 24 Nm ... 14,500 Nm |
| ELPEX-S | Rubber Disk Couplings | Highly-Flexible Coupling | 330 Nm ... 63,000 Nm |
Overview of hydrodynamic fluid coupling variables. Ideal for soft-starting high-inertia industrial conveyors and preventing unexpected overload torque breaks.
FLENDER Couplings - Product Series Overview
| Category | Series / Model Name |
|---|---|
| Torsionally Rigid Gear Couplings | ZAPEX ZW / ZAPEX ZN |
| Torsionally Rigid All-Steel Couplings | N-ARPEX, ARPEX |
| Flexible Couplings | N-EUPEX / RUPEX / N-BIPEX |
| Highly Flexible Couplings | ELPEX-B / ELPEX-S / ELPEX |
| Fluid Couplings | FLUDEX |
| Backlash-free Couplings | SIPEX / BIPEX-S |
* WeDrive provides full technical support for FLENDER power transmission components. Our selection includes both torsionally rigid and highly flexible options for diverse industrial applications.
