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The 2-stage BKM is the high-efficiency tier of the BKM helical hypoid geared motor series. It uses two gear stages to cover ratios from 7.5:1 to 60:1 at up to 92% efficiency, which is the highest efficiency level in the BKM family. A helical hypoid gear set offsets the output shaft at 90° and gives a higher single-stage ratio than a standard bevel gear pair, so the housing stays compact while delivering smooth, quiet running under continuous industrial load. Power range is 0.2 to 7.5 kW and output torque reaches up to 1500 Nm depending on frame size. Typical uses include conveyor systems, packaging machinery, industrial robotics, food processing equipment and warehouse logistics drives.
Two gear stages are stacked in the same cast housing. The two stages are aligned and pre-loaded at the factory, so the customer does not need to match two separate gearboxes or build an intermediate shaft on site.
Input stage takes motor speed down to an intermediate level. Mounted on the input side of the housing, sized for the motor flange or solid input shaft.
Output stage takes the intermediate speed down again to final output. The helical hypoid gear pair offsets the output at 90° and delivers torque out to the driven machine.
Total ratio is the product of the two stage ratios. This gives fine step coverage across the 2-stage range, so the exact output speed can be matched without going to a 3-stage unit.
Two stages mean less cumulative sliding friction than a 3-stage design, so efficiency stays at the highest level in the BKM family. This is why the 2-stage version is the preferred choice when a very high ratio is not required.
The 2-stage BKM and the 3-stage BKM share the same housing concept and the same helical hypoid gear family. The difference is the number of gear stages and the ratio window.
Six frame sizes cover the 2-stage range. Each frame shares the same helical hypoid gear set and the same 90° output layout, and differs in the power and torque window it can cover.
The 2-stage BKM is used where a driven machine needs a compact 90° geared motor with high efficiency and a moderate reduction ratio.
Warehouse and distribution centre conveyors where the drive sits 90° to the head pulley and needs a moderate reduction.
Filling heads, labeling axes and cartoning machines with fast, repeated cycle start-stop duty.
Robot joints and end-of-arm tooling where a compact right-angle geared motor must sit close to the payload.
Mixers, cutters, slicers and conveying axes, with food-grade lubricant and stainless options available.
Sorters, shuttle transfer units and cross-belt drives where the gearbox must fit inside a narrow machine frame.
Rotary indexers, gantry axes and positioning units that need high-efficiency 90° output.
Every 2-stage BKM unit is inspected for worm-free gear mesh, housing bore runout, backlash, noise and no-load running before packing. Material certificates are available on request.
ISO 9001:2015 certified quality management from raw material to final assembly. Products comply with IEC, DIN and GB standards.
Common questions about stage selection, efficiency and OEM supply.
Provide required output torque, output speed, ratio, input power, mounting configuration and driven machine description. Raydafon will confirm the correct 2-stage BKM frame, ratio and motor flange, and reply with a factory-direct quotation within 24 hours.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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