Introduction: Conveyor engineers can narrow KC37 to KC187 helical bevel gearmotor sizes by matching line speed, torque, ratio, shaft, and mounting data before drawing review.
When a conveyor designer knows belt speed, required torque, and available mounting space, moving through twelve frame sizes is faster when the selection starts with load and speed. Torque, ratio, shaft diameter, and mounting style then reduce the list. The KC series spans 0.12 to 200 kW, 180 to 50,000 N m, and ratios from 8 to 198. The highest values apply to specific models such as KC187, not every frame size. Treated as a specification ladder, these ranges produce a practical shortlist before full drawing review.
How Conveyor Load and Speed Point to the Right KC Size Range
Start with the mechanical load on the conveyor. Calculate the belt or chain pull needed at steady running conditions, then multiply that pull by the radius of the drive pulley or sprocket to get the torque required at the gearmotor output shaft. Line speed divided by pulley circumference gives output speed. Those two numbers, torque and speed, immediately rule out most frame sizes. A packaging conveyor running at 60 rpm and needing 300 N m sits in a very different band from an ore conveyor running at 15 rpm and needing 12,000 N m. With output speeds from 0.15 to 270 rpm and torque from 180 to 50,000 N m, the KC series lets the speed-torque combination point to a specific frame size group. Power rating adds a useful cross-check. Multiply torque by speed and apply the correct factor to estimate required power, then compare that figure with the frame size capability. The series spans 0.12 to 200 kW, but 200 kW is a model-specific rating for large frames such as KC187. Light and medium conveyors often start around KC37 to KC97. Heavy conveyors, long overland belts, and high-starting-torque duties move into the KC107 to KC187 range. Center height is another early filter. KC frames run from 100h13 to 600h13 mm, so clearance under the conveyor frame can quickly remove a frame size that is too tall or unnecessarily large.
How Torque and Ratio Narrow the KC37 to KC187 Selection
Once the frame size group is clear, torque and ratio identify the exact size. KC ratios run from 8 to 198, but each frame group has its own ratio range. KC37, KC47, and KC57 reach 102, 126, and 143. KC67 through KC157 reach 143, 175, 197, and 198. KC167 and KC187 cover 18 to 186. Higher ratios reduce output speed and multiply torque, which suits slow conveyors and inclined belts. Lower ratios fit high-speed transfer lines. Match ratio and frame size together rather than choosing a ratio first and then assuming a small frame can handle the torque.
1. Match Ratio Range to Conveyor Speed and Starting Load
Conveyors usually need low output speed, so ratios in the 50:1 to 150:1 band are common. A fully loaded belt can demand more torque at starting than it does at running speed, so the ratio choice must leave room for acceleration and possible stall conditions. High-inertia conveyors, long belts, or frequent start-stop lines should favor the upper end of the available ratio range for the chosen frame group. A 100:1 ratio may look perfect for output speed, but if peak torque exceeds the frame rating, move up a frame size instead of accepting a thin margin.
2. Check Torque Margin and Shaft Size Before Locking a Frame
Torque is the hardest filter. KC models cover 180 to 50,000 N m, but 50,000 N m belongs to KC187-class frames rather than the whole series. Always compare design torque with a margin for starting, material buildup, or jamming. Shaft diameter grows with torque. Solid shafts range from 25k6 to 190m6 mm, and hollow shaft bores run from 30 to 155 mm with H7 fit. Output flanges range from 160 to 660 mm. When the conveyor pulley shaft is already fixed, shaft diameter and flange size often decide the final frame size earlier than power does. These gearmotors use 20CrMnTi gears with HRC58-62 surface hardness and 5-6 grade grinding.
How Input and Mounting Options Affect the Final KC Model
The same frame size can be installed in different ways, and that changes the final model. KC gearmotors accept direct motor connection, flange input, or shaft input. Direct motor mounting suits standard conveyor drives and keeps the assembly simple. Shaft input or flange input gives more freedom when the conveyor layout needs the motor in another position or when the motor comes from another supplier. The right-angle layout itself saves space. Compared with an inline gearmotor, the helical-bevel design places the motor to the side of the conveyor, which often clears the conveyor frame, guard, or walkway. Mounting style also shapes the drawing review. Foot mounting fits traditional conveyor bases. Flange mounting connects the gearmotor directly to a frame or pulley support structure. Torque arm mounting suits hollow shaft gearmotors that mount directly on the conveyor shaft, with the torque arm absorbing reaction torque. Hollow shaft bores range from 30 to 155 mm with H7 fit, so the conveyor shaft must be machined to that tolerance. Output flanges from 160 to 660 mm help with alignment checks. For drawing review, send the conveyor layout, pulley shaft detail, required output speed, torque, duty factor, motor interface, available space, mounting orientation, and radial loads. These details move the selection from a frame size shortlist to a confirmable gearmotor model. Final selection depends on duty factor, radial loads, layout, and approved drawings.
Conclusion
Choosing a KC frame size for a conveyor drive requires checking five variables in the right order: load, speed, torque, ratio, and mounting. The KC37 to KC187 ladder spans light automated conveyors through heavy bulk handling, and the 0.12-200 kW and 180-50,000 N m envelope gives most conveyor projects a workable frame size. Working with a helical gear motor manufacturer that can review conveyor load data shortens the path from frame size shortlist to approved drawing. SLTM supports that drawing review and can confirm whether a KC frame size, shaft, flange, and mounting combination matches the conveyor layout. Use external torque and shaft formulas as background, then confirm the final selection through SLTM engineering review. Send the conveyor speed, torque, duty factor, available space, and target motor interface to get a specific model and drawing data for quotation.
FAQ
Q：How do I choose a KC series size for a conveyor with known speed and torque?
A：First convert conveyor line speed into output rpm and calculate required torque from the pulley radius and belt pull. Then compare that torque and rpm against the KC37 to KC187 frame sizes to remove obvious mismatches. Use ratio, shaft diameter, and mounting style to narrow the remaining list. Large frames such as KC187 can reach 50,000 N m, but each frame has its own permitted torque, so include starting torque and duty factor before locking a candidate.
Q：What is the difference between KC37 to KC187 sizes in torque, ratio, and shaft diameter?
A：The frame sizes step up from KC37 to KC187, with torque capability expanding from 180 N m to 50,000 N m, where the highest value belongs to KC187-class models. Ratios also change by frame group: KC37, KC47, and KC57 reach 102, 126, and 143; KC67 through KC157 reach 143, 175, 197, and 198; KC167 and KC187 cover 18 to 186. Solid shaft diameters run from 25k6 to 190m6 mm, hollow shaft bores run from 30 to 155 mm with H7 fit, and output flanges range from 160 to 660 mm.
Q：Which mounting and input data should I send for a KC series drawing review?
A：Send the conveyor layout, pulley shaft detail, required output speed, design torque, duty factor, radial loads, and motor interface type, whether it uses direct motor, flange input, or shaft input. State whether the gearmotor will be foot mounted, flange mounted, or torque arm mounted, and include available space, mounting orientation, center height limits, and any shaft or flange dimensions. These details let the engineering team check the KC frame size and return a confirmable model and drawing data.
Sources / References
Torque - Work done and Power Transmitted
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