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BKM series cast iron housing version is a 90° right-angle helical hypoid gearbox built on two larger base sizes, 110 and 130. Cast iron gives higher stiffness than the aluminium version of the same BKM family, so the gear housing holds its geometry under heavy continuous load and reversing duty. Two-stage ratios 7.5 to 60 run at up to 92% efficiency and three-stage ratios 60 to 300 run at up to 90%. Maximum output torque reaches 1500 Nm. Installation dimensions are fully compatible with the RV series worm gear reducers, so a BKM cast iron unit drops into an existing RV mount without changing the machine plate.
Two gear stages inside the cast iron housing. This is the higher-efficiency configuration and covers most industrial drive axes that need a moderate reduction.
Three gear stages stacked in the same housing. Higher total ratio and heavier torque output for low-speed, high-torque axes such as winches and mixers.
An existing RV mount can accept a BKM cast iron unit without redesigning the machine frame, and a machine originally specified with RV can later be upgraded to BKM without changing the plate, the shaft or the coupling.
Both base sizes 110 and 130 use a cast iron housing. Cast iron gives higher stiffness and better damping than the aluminium version of the same BKM family, which keeps the gear mesh stable under heavy continuous load and reversing duty.
| Parameter | BKM 110 | BKM 130 |
|---|---|---|
| Housing material | Cast iron | Cast iron |
| Gear type | Helical hypoid | Helical hypoid |
| Output direction | 90° right angle | 90° right angle |
| Power range | 0.18 – 4.0 kW | 1.5 – 7.5 kW |
| Max output torque | up to 660 Nm | up to 1500 Nm |
| 2-stage ratio | 7.5 – 60 | 7.5 – 60 |
| 2-stage efficiency | up to 92% | up to 92% |
| 3-stage ratio | 60 – 300 | 60 – 300 |
| 3-stage efficiency | up to 90% | up to 90% |
| Output mounting | Foot, flange, shaft | Foot, flange, shaft |
| Input interface | IEC motor flange | IEC motor flange |
| RV compatibility | Same mounting dimensions | Same mounting dimensions |
| Standard | IEC / DIN / GB | IEC / DIN / GB |
Cast iron is selected when the gearbox must hold its geometry under continuous heavy load or reversing duty, and when the machine frame already has the mass to support a cast iron unit. Common cases are CNC rotary axes, heavy mixers, hoists, and industrial robot joints with offset payload.
Provide required output torque, output speed, ratio, input power, mounting configuration and driven machine description. Raydafon will confirm the correct BKM base size (110 or 130), stage count and motor flange, and reply with a factory-direct quotation within 24 hours.
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