Description
High-Efficiency Right-Angle Gear Drives for Conveyors, Material Handling and Industrial Machinery
KB Transmission Star K Series helical bevel gearboxes combine precision helical gearing with bevel gearing to provide efficient 90-degree power transmission in a compact industrial drive.
Available from K37 to K187, the series covers motor combinations from 0.12 to 200 kW and maximum output torque from 200 to 50,000 Nm. Solid-shaft, hollow-shaft, shrink-disc, foot-mounted and flange-mounted configurations are available for conveyors, material handling equipment, mixers, packaging machinery and heavy industrial drives.
K37–K187 | 0.12–200 kW | Up to 50,000 Nm | Approx. 94% Gear-Unit Efficiency | Right-Angle Drive
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K Series Helical Bevel Gearbox at a Glance
| Specification | K Series |
|---|---|
| Gear Technology | Helical + Bevel Gearing |
| Drive Arrangement | 90° Right-Angle |
| Gearbox Sizes | K37–K187 |
| Complete Product Family Power Range | 0.12–200 kW |
| Maximum Output Torque | Up to 50,000 Nm |
| Gear-Unit Transmission Efficiency | Approx. 94% |
| Output Options | Solid Shaft / Hollow Shaft / Shrink Disc |
| Mounting Options | Foot / B5 Flange / B14 Flange / Shaft Mounted |
| Motor Connection | Complete Gearmotor / IEC Motor Adapter |
| Typical Applications | Conveyors, Material Handling, Mixers, Packaging Machinery and Industrial Equipment |
Actual permissible motor power, gear ratio and output torque depend on gearbox size, service factor, input speed, output speed, mounting position and operating conditions.
What Is a K Series Helical Bevel Gearbox?
A K Series helical bevel gearbox is a right-angle industrial gear reducer that combines helical gears and bevel gears to reduce motor speed, increase usable output torque and transmit power between perpendicular shafts.
Unlike an inline helical gearbox, the K Series changes the drive direction by approximately 90 degrees. This makes it particularly suitable for machinery where space, shaft orientation or equipment layout requires a compact right-angle transmission.
The combination of helical and bevel gearing provides efficient power transmission, high torque capacity, smooth operation and flexible installation for continuous-duty industrial applications.
Why Choose a K Series Helical Bevel Gearbox?
High Transmission Efficiency
The K Series provides approximately 94% gear-unit transmission efficiency, making it suitable for continuous industrial drive applications where energy efficiency and thermal performance are important.
Right-Angle Power Transmission
The perpendicular input and output arrangement allows the motor to be installed at approximately 90 degrees to the driven shaft, helping reduce axial installation space and simplify machine layout.
High Torque Capacity
The K Series covers maximum torque ratings from 200 Nm to 50,000 Nm, allowing one product family to serve applications ranging from compact machinery to heavy-duty industrial systems.
Flexible Output Configurations
Solid-shaft, hollow-shaft and shrink-disc versions are available for different machine shaft arrangements and installation requirements.
Modular Mounting Options
Foot-mounted, B5 flange, B14 flange and shaft-mounted configurations allow the K Series to be integrated into conveyors, mixers, material handling equipment and OEM machinery.
K Series Helical Bevel Gearbox Configurations
| Version | Configuration | Typical Application |
|---|---|---|
| K | Foot-mounted, solid shaft | General right-angle industrial drives |
| KA | Hollow shaft | Shaft-mounted machinery |
| KF | B5 flange-mounted | Direct machine flange connection |
| KAF | B5 flange + hollow shaft | Compact shaft-mounted installation |
| KAZ | B14 flange + hollow shaft | Compact B14 flange installation |
| KH | Hollow shaft + shrink disc | Keyless shaft-mounted drive |
| KHF | B5 flange + shrink disc | Flange-mounted shrink-disc drive |
| KHZ | B14 flange + shrink disc | Compact shrink-disc installation |
The K Series modular design supports different shaft and mounting arrangements while maintaining the same right-angle helical-bevel transmission principle.
Not every configuration is available in every gearbox size and gear ratio. Final configuration should be confirmed according to the required shaft arrangement, flange type, mounting position and operating conditions.
K37–K187 Models, Ratios & Torque Ratings
| Model | Motor Power* | Approx. Ratio Range** | Max. Output Torque | Main Mounting / Output Options |
|---|---|---|---|---|
| K37 | 0.12–4 kW | 3.06–106.38 | 200 Nm | Foot / Flange / Hollow Shaft |
| K47 | 0.12–5.5 kW | 4.64–131.87 | 400 Nm | Foot / B5 / B14 / Hollow Shaft |
| K57 | 0.12–7.5 kW | 5.69–145.14 | 600 Nm | Foot / Flange / Hollow / Shrink Disc |
| K67 | 0.12–11 kW | 5.20–144.79 | 820 Nm | Foot / Flange / Hollow / Shrink Disc |
| K77 | 0.12–15 kW | 7.24–192.18 | 1,550 Nm | Foot / Flange / Hollow / Shrink Disc |
| K87 | 0.12–22 kW | 7.21–197.37 | 2,700 Nm | Foot / Flange / Hollow / Shrink Disc |
| K97 | 0.12–30 kW | 7.64–176.05 | 4,300 Nm | Foot / Flange / Hollow / Shrink Disc |
| K107 | 0.12–45 kW | 7.36–143.47 | 8,000 Nm | Foot / Flange / Hollow / Shrink Disc |
| K127 | 0.12–90 kW | 8.68–146.07 | 13,000 Nm | Foot / Flange / Hollow / Shrink Disc |
| K157 | 0.12–160 kW | 12.66–150.41 | 18,000 Nm | Foot / Flange / Hollow / Shrink Disc |
| K167 | 0.12–200 kW | 17.34–164.50 | 32,000 Nm | Foot / Flange / Hollow / Shrink Disc |
| K187 | 0.12–200 kW | 17.18–179.86 | 50,000 Nm | Foot / Flange / Hollow / Shrink Disc |
* Motor power values represent the available combination envelope for each gearbox size. Not every motor power is available at every ratio.
** Ratio ranges summarize available selection combinations and should be confirmed for the required motor, gearbox size and mounting configuration.
The K Series torque progression ranges from 200 Nm for K37 to 50,000 Nm for K187, while available motor combinations increase progressively with gearbox size.
Important Selection Note
The values above represent the overall operating envelope for each K Series gearbox size. They do not mean that every motor power, gear ratio and torque combination can be used together.
Final gearbox selection must be verified according to:
- Motor power
- Input speed
- Required output speed
- Gear ratio
- Required output torque
- Service factor
- Starting frequency
- Operating hours
- Radial and axial loads
- Shaft configuration
- Mounting position
K Series Critical Dimensions for Installation & Replacement
| Model | Solid Shaft Ø | Shaft Extension | Hollow Shaft Bore | Max. Output Torque |
|---|---|---|---|---|
| K37 | 25 mm | 50 mm | 30 mm H7 | 200 Nm |
| K47 | 30 mm | 60 mm | 35 mm H7 | 400 Nm |
| K57 | 35 mm | 70 mm | 40 mm H7 | 600 Nm |
| K67 | 40 mm | 80 mm | 40 mm H7 | 820 Nm |
| K77 | 50 mm | 100 mm | 50 mm H7 | 1,550 Nm |
| K87 | 60 mm | 120 mm | 60 mm H7 | 2,700 Nm |
| K97 | 70 mm | 140 mm | 70 mm H7 | 4,300 Nm |
| K107 | 90 mm | 170 mm | 90 mm H7 | 8,000 Nm |
| K127 | 110 mm | 210 mm | 100 mm H7 | 13,000 Nm |
| K157 | 120 mm | 210 mm | 120 mm H7 | 18,000 Nm |
| K167 | 160 mm | 250 mm | 135 / 140 mm H7* | 32,000 Nm |
| K187 | 190 mm | 320 mm | 155 / 160 mm H7* | 50,000 Nm |
* Hollow-shaft dimensions depend on the selected K Series configuration. Confirm the exact version before manufacturing or replacement approval.
Important Dimension Note
Frame size alone is not sufficient to confirm replacement compatibility.
Before replacing an existing gearbox, verify:
- Solid or hollow output shaft
- Shaft diameter
- Shaft extension
- Flange dimensions
- Foot mounting dimensions
- Shaft center position
- Motor interface
- Mounting position
- Shrink-disc arrangement where applicable
K Series Helical Bevel Gearmotors
K Series gearboxes can be supplied as complete helical bevel gearmotors or as gearbox units configured for motor connection.
Complete gearmotor combinations provide a compact integrated drive solution for conveyors, material handling systems and industrial machinery, while IEC motor adapter configurations allow the gearbox to be matched with an appropriate motor according to local standards or existing plant requirements.
Motor size must be selected according to motor power, pole number, gear ratio, gearbox size and operating conditions.
How to Select a K Series Helical Bevel Gearbox
Selecting a K Series gearbox based only on motor power or nominal gear ratio is not sufficient. Reliable gearbox selection requires the complete operating condition to be evaluated.
1. Determine Motor Power
Identify the rated driving motor power:
P₁ = Motor Power (kW)
Motor power determines available input power but does not independently determine gearbox size.
2. Determine Input and Output Speed
Identify:
n₁ = Input Speed (rpm)
n₂ = Required Output Speed (rpm)
A nominal input speed of approximately 1,400 rpm is commonly used for preliminary selection with a four-pole motor, but actual motor speed should be used for final selection.
3. Calculate the Required Gear Ratio
The transmission ratio is calculated as:
i = n₁ / n₂
Example
Motor speed:
1,400 rpm
Required output speed:
70 rpm
Therefore:
i = 1400 ÷ 70 = 20:1
A K Series gearbox with an available ratio near 20:1 can then be evaluated according to torque, service factor and load requirements.
4. Calculate Required Output Torque
Use:
M₂ = 9550 × P₁ × η / n₂
Where:
- M₂ = Output torque, Nm
- P₁ = Input power, kW
- η = Transmission efficiency
- n₂ = Output speed, rpm
For preliminary K Series calculations:
η ≈ 0.94
The calculated operating torque must then be checked against the permissible gearbox torque and required service factor.
5. Determine the Required Service Factor
Gearbox service factor depends on more than rated motor power.
Important operating factors include:
- Daily operating time
- Starting frequency
- Load classification
- Mass acceleration factor
- Machine operating characteristics
Loads can be classified according to uniform, moderate-shock or heavy-shock operating conditions, with the required service factor adjusted according to duty and starting frequency.
A useful engineering check is:
Required Permissible Gearbox Torque ≥ Operating Torque × Required Service Factor
Applications with long operating hours, frequent starts or shock loading normally require a higher service factor.
6. Check Radial and Axial Loads
Pulleys, chain sprockets and other externally mounted transmission components generate additional loads on the gearbox output shaft.
For accurate selection, confirm:
- Output shaft load
- Sprocket or pulley diameter
- Load application position
- Radial force
- Axial force
- Shaft direction
This is particularly important for conveyor and material-handling drives.
7. Confirm Shaft and Mounting Configuration
Before ordering, confirm whether the machine requires:
- Solid output shaft
- Hollow output shaft
- Shrink-disc connection
- Foot mounting
- B5 flange
- B14 flange
- Shaft mounting
The gearbox model and mounting configuration should be selected together rather than independently.
K Series Gearbox Selection Example
Example: Low-Speed High-Torque Industrial Drive
Required Output Torque: 5,000 Nm
Operating Time: 8 hours/day
Load Type: Uniform
Required Service Factor: 1.1
Input Speed: 1,400 rpm
Required Output Speed: 4 rpm
Step 1 — Calculate Gear Ratio
i = 1400 ÷ 4 = 350
Step 2 — Apply Service Factor
Required Rated Torque = 5,000 × 1.1
Required Rated Torque = 5,500 Nm
Step 3 — Determine Required Input Power
Using the transmission-efficiency relationship, the preliminary required input power is approximately:
2.55 kW
Because the required ratio of 350:1 is outside the standard single K Series ratio ranges shown above, a combined reduction arrangement or another suitable high-ratio drive configuration must be evaluated.
This example demonstrates why gearbox selection should not be based on motor power or gear ratio alone. Torque, service factor, operating conditions and external loads must be evaluated together.
K Series Helical Bevel Gearbox Applications
Belt Conveyors
K Series gearboxes provide efficient right-angle power transmission for belt conveyor systems used in factories, warehouses, processing lines and material-handling systems.
Chain Conveyors
High torque capacity and robust right-angle construction make the K Series suitable for industrial chain conveyors and heavier material transport systems.
Pallet Conveyors
Compact gearmotor arrangements are well suited to pallet conveying systems, warehouse automation and production logistics.
Material Handling Equipment
K Series units can be used in transfer conveyors, handling systems and industrial equipment requiring compact 90-degree power transmission.
Mixers and Agitators
High torque capability and continuous-duty efficiency make the K Series suitable for many industrial mixing and processing applications, subject to radial and axial load verification.
Packaging Machinery
Compact right-angle installation helps machine designers reduce drive-system footprint in conveyors, packaging lines and automated production equipment.
Hoists and Lifting Equipment
High-torque K Series configurations can be evaluated for lifting and positioning systems when the complete drive, brake and safety system is properly engineered.
OEM Industrial Machinery
Multiple shaft, flange, motor and mounting configurations make the K Series suitable for custom machine builders and OEM industrial equipment manufacturers.
K Series vs R Series Gearbox
| Feature | K Series | R Series |
|---|---|---|
| Gear Technology | Helical + Bevel | Helical |
| Shaft Arrangement | Right-Angle | Inline / Coaxial |
| Maximum Torque | Up to 50,000 Nm | Up to 18,000 Nm |
| Hollow Shaft | Widely Available | Not Primary Configuration |
| Shrink Disc | Available | Not Primary Configuration |
| Installation Layout | Compact 90° Arrangement | Axial Arrangement |
| Typical Applications | Conveyors, Material Handling, Right-Angle Drives | Inline Conveyors, Mixers and Machinery |
K Series or R Series?
Choose a K Series gearbox when the machine requires a right-angle drive, hollow-shaft mounting or compact 90-degree installation.
Choose an R Series helical gearbox when the motor and driven shaft should remain inline or coaxial.
K Series vs F Series Gearbox
| Feature | K Series | F Series |
|---|---|---|
| Gear Technology | Helical + Bevel | Helical |
| Shaft Arrangement | 90° Right-Angle | Parallel / Offset |
| Hollow Shaft | Available | Available |
| Shrink Disc | Available | Available |
| Installation Layout | Right-Angle | Parallel Shaft |
| Maximum Torque | Up to 50,000 Nm | Up to 18,000 Nm |
| Typical Applications | Right-Angle Conveyors / Heavy Drives | Parallel-Shaft Conveyors / Material Handling |
K Series or F Series?
Choose a K Series gearbox when the input and output shafts must operate at approximately 90 degrees.
Choose an F Series parallel shaft helical gearbox when the input and output shafts should remain parallel while using a compact offset or shaft-mounted arrangement.
K Series Helical Bevel Gearbox vs Worm Gearbox
| Feature | K Series Helical Bevel | Worm Gearbox |
|---|---|---|
| Shaft Arrangement | Right-Angle | Right-Angle |
| Gear Principle | Helical + Bevel | Worm + Worm Wheel |
| Transmission Efficiency | High | Generally Lower at Many Ratios |
| Heat Generation | Generally Lower | Often Higher |
| Continuous-Duty Applications | Excellent | Depends on Ratio and Thermal Capacity |
| Compact High Reduction | Moderate | Strong Advantage |
| Self-Locking Potential | No | Possible Under Specific Conditions |
| Heavy-Duty Torque Capability | High | Size and Ratio Dependent |
A K Series helical bevel gearbox is often preferred when a right-angle drive must operate continuously with high efficiency and high torque.
An NMRV worm gear reducer remains advantageous where compact high reduction ratios, simple right-angle construction or specific resistance to back-driving are required.
Worm gearbox self-locking must not be assumed solely from gearbox type and should never be used as a substitute for a dedicated safety brake.
Looking for a High-Efficiency Alternative to a Worm Gearbox?
K Series helical bevel gearboxes can be evaluated as an alternative to worm gear reducers where the application requires:
- Higher transmission efficiency
- Continuous-duty operation
- Reduced thermal losses
- Higher torque capacity
- Right-angle shaft arrangement
- Hollow-shaft installation
Replacement compatibility must be checked according to ratio, torque, output shaft, mounting dimensions and machine operating conditions.
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SEW K Series Gearbox Equivalent & Replacement Support
Looking for an SEW K Series Gearbox Equivalent?
KB Transmission Star K Series helical bevel gearboxes can be evaluated for industrial applications currently using selected SEW-EURODRIVE K Series units.
Replacement should not be determined from the frame number or nominal ratio alone.
Our engineering team can compare:
- Existing gearbox brand and model
- Gear ratio
- Output speed
- Required output torque
- Motor power
- Solid or hollow shaft configuration
- Output shaft diameter
- Flange dimensions
- Shaft height
- Mounting position
- Shrink-disc arrangement
- Radial and axial loads
- Service factor
Send us your existing gearbox nameplate, dimensional drawing or installation photos, and we can evaluate the corresponding KB Transmission Star K Series configuration.
CHECK MY EXISTING GEARBOX
K Series Output Shaft & Dimensional Support
Detailed dimensional data is available for solid-shaft, hollow-shaft, flange-mounted, shrink-disc and motor-adapter configurations.
Standard solid-output-shaft diameters range from approximately 25 mm for K37 to 190 mm for K187, depending on configuration.
For replacement projects, dimensional compatibility should be checked using the exact gearbox version rather than frame size alone.
Our engineering team can provide:
- Outline dimensions
- Output shaft dimensions
- Hollow shaft dimensions
- B5 flange dimensions
- B14 flange dimensions
- Shaft height
- Motor adapter dimensions
- Mounting-position information
REQUEST DIMENSION DRAWING
K Series Gearbox Manufacturing & Quality Control
Precision Housing Machining
Bearing bores, mounting faces and shaft positions are CNC-machined to maintain gear alignment and dimensional consistency.
Helical and Bevel Gear Manufacturing
Helical and bevel gear components are manufactured for reliable tooth contact, smooth meshing and stable torque transmission.
Shaft and Bearing Inspection
Critical shaft dimensions, bearing fits and assembly interfaces are checked before assembly.
Controlled Gearbox Assembly
Gears, shafts, bearings and seals are assembled according to defined production procedures.
Running Inspection
Completed gearbox units are checked for smooth rotation, abnormal noise, leakage and general operating condition.
Final Dimensional Verification
Shaft configuration, flange type, mounting arrangement and customer order specifications are checked before packing and shipment.
Why Choose KB Transmission Star?
Engineering-Based Gearbox Selection
We evaluate gear ratio, torque, service factor, operating conditions and external shaft loads rather than selecting a gearbox based only on motor power.
Complete K37–K187 Range
The K37–K187 product family covers applications from compact industrial machinery to high-torque material-handling systems.
Flexible Shaft and Mounting Options
Solid shaft, hollow shaft, shrink-disc, foot-mounted, B5 flange and B14 flange configurations are available depending on gearbox size and ratio.
OEM Gearbox Support
We support machine builders, industrial OEMs and distributors with application selection, motor matching, drawings and custom branding requirements.
Replacement Engineering Support
Existing gearbox nameplates, drawings and installation dimensions can be reviewed before a replacement recommendation is made.
Technical Documentation
Selection data, dimensional drawings and application information are available to support engineering approval and purchasing decisions.
K Series Helical Bevel Gearbox FAQ
What is a K Series helical bevel gearbox?
A K Series helical bevel gearbox is a right-angle industrial speed reducer that combines helical and bevel gearing to reduce motor speed, increase output torque and transmit power between perpendicular shafts.
What K Series gearbox sizes are available?
The KB Transmission Star K Series covers:
K37, K47, K57, K67, K77, K87, K97, K107, K127, K157, K167 and K187.
What is the maximum output torque?
The K Series ranges from approximately 200 Nm for K37 to 50,000 Nm for K187.
What is the motor power range?
Across the complete K Series product family, available motor combinations range from approximately 0.12 to 200 kW, depending on gearbox size, ratio and configuration.
What is the efficiency of a K Series helical bevel gearbox?
K Series gear units provide approximately 94% transmission efficiency. Actual drive-system efficiency depends on the final configuration and operating conditions.
What is the difference between K Series and R Series gearboxes?
K Series gearboxes provide a right-angle output using helical-bevel gearing, while R Series gearboxes use an inline or coaxial helical arrangement.
What is the difference between K Series and F Series gearboxes?
K Series gearboxes transmit power through an approximately 90-degree right-angle arrangement. F Series gearboxes use a parallel, offset shaft arrangement.
What output shaft options are available?
Depending on the gearbox version, the K Series can be configured with a solid output shaft, hollow shaft or hollow shaft with shrink-disc connection.
What mounting options are available?
Available configurations include foot mounting, B5 flange, B14 flange and shaft-mounted arrangements depending on gearbox size and version.
How do I select the correct K Series gearbox?
Selection should consider motor power, input speed, required output speed, gear ratio, required torque, service factor, radial and axial loads, shaft configuration and mounting position.
Can a K Series gearbox replace a worm gearbox?
A K Series helical bevel gearbox can be evaluated as a higher-efficiency alternative in many right-angle industrial drives, but ratio, torque, shaft dimensions, mounting dimensions and operating conditions must be verified before replacement.
Can your K Series replace an SEW K Series gearbox?
Selected applications can be cross-referenced, but compatibility should not be assumed from model number alone. Ratio, torque, shaft dimensions, flange dimensions, motor interface, mounting position and operating conditions should be verified before ordering.
Is a K Series gearbox suitable for conveyors?
Yes. K Series helical bevel gearboxes are particularly suitable for belt conveyors, chain conveyors, pallet conveyors and material-handling systems requiring efficient right-angle power transmission.
What information do you need for a quotation?
Please provide motor power, input speed, required output speed or gear ratio, required torque, application, operating hours, load type, mounting position, shaft configuration, quantity and existing gearbox information where applicable.
Get a K Series Engineering Selection
Send us your application data and our engineering team will evaluate a suitable K Series gearbox configuration.
Application: ___
Motor Power: ___ kW
Input Speed: ___ rpm
Required Output Speed: ___ rpm
Required Gear Ratio: ___
Required Output Torque: ___ Nm
Operating Hours per Day: ___
Load Type: ___
Starting Frequency: ___
Output: Solid Shaft / Hollow Shaft / Shrink Disc
Mounting Type: ___
Existing Gearbox Brand & Model: ___
Quantity: ___
Country: ___
Email: ___
Upload: Nameplate / Drawing / Installation Photo
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K Series Helical Bevel Gearbox Manufacturer
KB Transmission Star provides K Series helical bevel gearboxes and gearmotors for industrial OEMs, distributors and end users requiring efficient right-angle power transmission.
From compact K37 units to heavy-duty K187 configurations, our engineering team can support new gearbox selection, motor matching, dimensional verification and existing gearbox replacement.
K37–K187 | 0.12–200 kW | 200–50,000 Nm | Right-Angle Helical-Bevel Drive
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