Use this hub to specify a bevel helical geared motor for a right-angle drive layout, and to judge when inline helical geared motors are the simpler answer for conveyors, packaging machines and general automation. Work through the selection inputs, the KC37 to KC187 frame range, the mounting options and the trade-off matrix, then send your duty data for a quotation.
Selection logic
Both layouts reduce motor speed to a usable output speed. The decision is made by where the motor can physically sit, how much torque has to fit inside the frame, and how the unit is fixed to the machine.
| Decision factor | Inline helical | Right-angle bevel helical |
|---|---|---|
| Drive direction | Input and output sit on the same axis line. | Input turns 90° to the output, so the motor sits beside the driven shaft. |
| Space envelope | Longer along the shaft axis, low in profile. | Short axially, but needs side clearance for the motor. |
| Torque density | Grows with frame size and additional stages. | High torque in a compact housing by combining helical and spiral bevel stages. |
| Mounting | Foot or flange on a flat machine frame. | Horizontal or vertical, with flange, torque arm or threaded-hole fixing. |
| Typical applications | Straight in-line drives in general machinery. | Metallurgy, petrochemical, mining, packaging, conveyors, ceramic, printing and stage machinery. |
Data intake
Collect these eight items before comparing frame sizes. A quotation that is missing any of them usually comes back as a question instead of a confirmed model.
Record the continuous and peak torque the machine actually needs at the driven shaft, not at the motor, including start-up and jam conditions.
Write down the output rpm the process needs, then check it falls inside the KC output speed range of 0.15–270 rpm.
Apply a service factor that reflects the shock level of the driven machine before you compare your load torque with any permitted torque figure.
Continuous, intermittent or reversing duty changes heat build-up and lubrication expectations, so describe the daily running pattern.
Frequent starts raise thermal and inertial load on both gear unit and motor. Count the worst hour of the working day.
List belt, chain, sprocket or coupling loads acting on the output shaft, together with their distance from the housing.
Temperature, dust, humidity and wash-down practice influence sealing, coating and oil choices for the unit.
Decide whether the unit hangs from a flange, a torque arm or threaded holes, and whether the input is motor-connected, flange input or shaft input.
Pass the completed checklist to the engineering team and you will get a frame size, ratio and mounting proposal instead of a generic price list.
Send your application data through the contact pageProduct data
The KC series helical-bevel geared motor covers twelve frame sizes, from KC37 to KC187, so you can match the housing to the available space instead of oversizing the drive.
Permitted torque is the ceiling for a frame size, not a target. Apply your service factor to the load torque first, then use the shaft diameter and center height below to check the output connection.
| Model | Shaft dia. (mm) | Center height (mm) | Motor power (kW) | Ratio | Permitted torque (Nm) | Weight (kg) |
|---|---|---|---|---|---|---|
| KC37 | 25k6 | 30 | 0.12 ~ 2.2 | 8 ~ 102 | 180 | 13 |
| KC47 | 35k6 | 35 | 0.18 ~ 4 | 8 ~ 126 | 380 | 22 |
| KC57 | 35k6 | 40 | 0.25 ~ 5.5 | 8 ~ 143 | 580 | 29 |
| KC67 | 40k6 | 40 | 0.37 ~ 7.5 | 8 ~ 143 | 680 | 33 |
| KC77 | 50k6 | 50 | 0.75 ~ 11 | 8 ~ 175 | 1300 | 45 |
| KC87 | 60m6 | 60 | 1.5 ~ 18.5 | 8 ~ 197 | 2500 | 81 |
| KC97 | 70m6 | 70 | 2.2 ~ 30 | 8 ~ 197 | 3900 | 150 |
| KC107 | 90m6 | 90 | 4 ~ 45 | 8 ~ 197 | 6800 | 230 |
| KC127 | 100m6 | 100 | 7.5 ~ 90 | 8 ~ 197 | 11200 | 420 |
| KC157 | 120m6 | 120 | 11 ~ 110 | 8 ~ 198 | 11700 | 680 |
| KC167 | 160m6 | 135 | 15 ~ 160 | 18 ~ 186 | 32000 | 1050 |
| KC187 | 190m6 | 155 | 18.5 ~ 200 | 18 ~ 186 | 50000 | 1650 |
Weights are quoted without oil and without the motor; shaft and flange input versions add 10%.
Trade-offs
Read the matrix row by row and decide which two rows matter most on your machine. The layout that wins those two rows is normally the correct purchase.
| Aspect | Inline helical | Right-angle bevel helical | What it means for your machine |
|---|---|---|---|
| Space envelope | Long along the drive axis, low profile | Short axially, motor sits 90° to the output | Choose right-angle when machine length is fixed but side space exists. |
| Torque density | Rises with frame size and extra stages | High: helical plus spiral bevel stages in a compact housing | Right-angle pays off where high torque must fit a small frame. |
| Transmission efficiency | Typically the highest, with the fewest right-angle stages | Very high, with one bevel pair added; stated as much higher than the SC series | On continuous high-power duty, weigh energy cost against the layout benefit. |
| Ratio coverage | Wide ratio range in a single unit | Ratio from 8~102 on KC37 up to 18~186 on KC187 | Confirm the exact ratio at the frame size you select, not just the series range. |
| Mounting flexibility | Foot or flange on a flat frame | Horizontal or vertical, bottom threaded hole, case end face threaded hole, small flange or torque arm | More mounting choices mean fewer custom brackets and faster installation. |
| Noise and vibration | Smooth running; depends on stage count | Precision-ground gears at grade 6~5 keep noise and vibration low | Decisive near operators, in packaging halls and on stage machinery. |
| Initial cost | Lower for the same torque where space allows | Higher, because of the extra bevel stage | Right-angle is chosen for layout reasons, not for the lowest first cost. |
| Maintenance | Oil level and general inspection | Oil level, inspection and seal checks at the output end | Plan a service window for both; right-angle units are easier to reach when the motor is remote. |
Sizing tool
Start from the load torque you calculated with your service factor, find the matching band, then confirm the ratio delivers the output speed you need.
| Required torque (with service factor) | Candidate frames | Confirm next |
|---|---|---|
| Up to 180 Nm | KC37 | Shaft 25k6 with 30 mm center height; ratio 8~102 |
| 181 ~ 680 Nm | KC47, KC57, KC67 | Motor power 0.18~7.5 kW; ratio 8~143 |
| 681 ~ 3,900 Nm | KC77, KC87, KC97 | Motor power 0.75~30 kW; ratio 8~197 |
| 3,901 ~ 11,200 Nm | KC107, KC127 | Motor power 4~90 kW; shaft 90m6 / 100m6 |
| 11,201 ~ 32,000 Nm | KC157, KC167 | Motor power 11~160 kW; ratio 8~198 or 18~186 |
| Above 32,000 Nm | KC187 | Motor power 18.5~200 kW; ratio 18~186; 1,650 kg |
This is a first shortlist, not a final selection. The same frame covers a whole ratio band, so output speed, mounting and shaft connection still have to be checked before ordering. If your layout does not need a 90° turn, compare the inline RC and FC series in the series table below.Build quality
Reliability on a geared drive comes from three things: the steel, the heat treatment and how accurately the teeth are finished. Here is what the KC series documents.
Gears are made from 20CrMnTi alloy steel, giving the core strength and case hardness needed for heavy-duty industrial duty.
Tempering, cementing and quenching raise gear hardness to HRC58°~62° before final finishing.
All gears are accurately ground, with precision reaching grade 6~5 for accurate, quiet meshing.
Precision grinding keeps vibration and noise low, which protects nearby equipment and improves the working environment.
Gearboxes go through rigorous heat treatment and testing before dispatch, so a unit leaves the plant as a checked assembly.
The combined helical and bevel design delivers transmission efficiency much higher than the SC series, supporting energy savings and lower running cost.
Buyer decision: ask for the material, hardness and gear accuracy grade for the exact frame size you order, and keep the oil and inspection intervals aligned with your duty cycle.
Application fit
Different applications make different inputs dominant. Match your scenario below, then lock that input into the checklist before you compare frames.
| Application scenario | What usually decides the size | Specify or confirm |
|---|---|---|
| Belt and chain conveyors | Starting torque and starts per hour | Load torque with service factor, output speed, torque arm or flange mounting |
| Automated packaging systems | Compact footprint and smooth motion | Right-angle layout, ratio band, output connection, noise expectation |
| Metallurgical machinery | Heat, dust and near-continuous running | Ambient temperature, duty cycle, lubrication and inspection interval |
| Petrochemical machinery | Round-the-clock operation | Duty cycle, oil change schedule, mounting position, coupling loads |
| Mining and construction machinery | Shock loads and rough handling | Service factor, radial and axial loads, protected mounting and sealing |
| Printing and packaging machinery | Even motion at low output speed | Output speed inside 0.15–270 rpm, ratio, gear accuracy grade 6~5 |
| Ceramic machinery | Abrasive dust around the drive | Sealing arrangement, ambient conditions, vertical or horizontal mounting |
| Stage machinery | Quiet operation and repeatable positioning | Low vibration and noise, ratio accuracy, vertical mounting |
Send the sizing data for your machine and the engineering team will propose a frame size, ratio, mounting and input form for the KC series helical-bevel geared motor. Quotes can cover a single replacement unit or a volume order for an OEM build, and a model datasheet can be issued alongside the offer.
Keep adjacent product options together for a faster catalog comparison.
Engineered for industrial automation, our RC series helical geared motor provides 0.1–560 rpm output. Trust our helical geared motor manufacturer for precision.
View product
FC series parallel shaft helical geared motor provides up to 50,000 Nm of torque. As a reliable helical geared motor manufacturer, we deliver precision-engineered power transmission for industrial…
View product
Heavy-duty parallel shaft gear unit by STLM with reinforced housing and efficient torque transfer. Backed by expert industrial gearbox manufacturers and reliable gear reducers manufacturers.
View producta right-angle bevel helical unit such as the kc series combines helical gears with spiral bevel gears, so the output turns 90° to the input and the housing stays compact. an inline or parallel shaft helical unit keeps input and output on the same axis, which suits long, straight machine frames.
the range runs from kc37 to kc187, with output speed from 0.15 to 270 rpm, output torque up to 50,000 nm and motor power from 0.18 to 200 kw. input forms are directly connected with motor, flange input or shaft input.
start with the load torque at the driven shaft, multiply it by a service factor that matches the shock level of the machine, then compare the result with the permitted torque of each frame size. confirm the ratio delivers your required output speed, and check the shaft diameter and center height against the driven connection.
the kc series supports horizontal and vertical installation, with horizontal type bottom threaded hole fixing, case end face threaded hole fixing, small flange installation and torque arm installation. choose the form that matches how the unit is supported on your machine frame.
gears are made from 20crmnti alloy steel, hardened to hrc58°~62° through tempering, cementing and quenching, then accurately ground to a precision of grade 6~5. that combination keeps vibration and noise low during operation.
send your output torque with service factor, output speed or ratio, motor power, mounting position, input form, duty cycle, ambient conditions and quantity. weights are quoted without oil and without the motor, and shaft or flange input versions add 10%. include these details and the reply can come back as a confirmed frame size rather than a general price.
