Description

K Series Helical Bevel Gearbox & Gearmotor Manufacturer

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. The supplied catalog specifies approximately 94% gear-unit transmission efficiency for the K Series.

K37–K187 | 0.12–200 kW | Up to 50,000 Nm | Approx. 94% Efficiency | Right-Angle Drive

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K Series Helical Bevel Gearbox at a Glance

Actual permissible motor power, gear ratio and output torque depend on gearbox size, service factor, input speed, output speed, mounting position and operating conditions.

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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.

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Why Choose a K Series Helical Bevel Gearbox?

High Transmission Efficiency

The supplied K Series catalog specifies approximately 94% gear-unit transmission efficiency, making the series 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 catalog 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.

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K Series Helical Bevel Gearbox Configurations

The K Series modular design supports different shaft and mounting arrangements while maintaining the same right-angle helical-bevel transmission concept. The catalog shows foot-mounted, hollow-shaft, B5 flange, B14 flange and shrink-disc versions.

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.

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K37–K187 Models, Ratios & Torque Ratings

* Motor power values represent catalog combination envelopes. Not every power is available at every ratio.

** Gear ratio ranges are summarized from the available catalog selection combinations and should be confirmed for the required motor, gearbox and mounting configuration.

The catalog selection tables define the main K Series torque progression as 200, 400, 600, 820, 1,550, 2,700, 4,300, 8,000, 13,000, 18,000, 32,000 and 50,000 Nm from K37-class through K187-class units.

The performance tables include motor combinations beginning at 0.12 kW and continuing through progressively larger industrial motor ratings across the gearbox range.

Important Selection Note

The values above represent the overall catalog 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

Critical Dimensions

Website Model	Original TK	Solid Shaft Ø	Shaft Extension	Hollow Shaft Bore	Max. Torque
K37	TK38	25 mm	50 mm	30 mm H7	200 Nm
K47	TK48	30 mm	60 mm	35 mm H7	400 Nm
K57	TK58	35 mm	70 mm	40 mm H7	600 Nm
K67	TK68	40 mm	80 mm	40 mm H7	820 Nm
K77	TK78	50 mm	100 mm	50 mm H7	1,550 Nm
K87	TK88	60 mm	120 mm	60 mm H7	2,700 Nm
K97	TK98	70 mm	140 mm	70 mm H7	4,300 Nm
K107	TK108	90 mm	170 mm	90 mm H7	8,000 Nm
K127	TK128	110 mm	210 mm	100 mm H7	13,000 Nm
K157	TK158	120 mm	210 mm	120 mm H7	18,000 Nm
K167	TK168	160 mm	250 mm	135/140 mm H7*	32,000 Nm
K187	TK188	190 mm	320 mm	155/160 mm H7*	50,000 Nm

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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 customers to match the gearbox 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.

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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.

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2. Determine Input and Output Speed

Identify:

n₁ = Input Speed

n₂ = Required Output Speed

The K Series catalog selection tables commonly use a nominal input speed of approximately 1,400 rpm for preliminary selection.

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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.

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4. Calculate Required Output Torque

The catalog uses the following relationship:

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, the supplied catalog specifies approximately:

η = 0.94

The calculated operating torque must then be checked against the permissible gearbox torque and the required service factor.

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5. Determine the Required Service Factor

Gearbox service factor depends on more than rated motor power.

The K Series catalog considers:

• Daily operating time
• Starting frequency
• Load classification
• Mass acceleration factor
• Machine operating characteristics

The catalog classifies loads into uniform, moderate-shock and heavy-shock operating conditions and provides service-factor guidance according to duty and starting frequency.

A basic engineering principle 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.

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6. Check Radial and Axial Loads

Pulleys, chain sprockets and other externally mounted transmission components generate additional loads on the gearbox output shaft.

The supplied catalog provides radial-load calculations and permissible shaft-load data according to gearbox size and load position.

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.

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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.

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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 catalog selection method and transmission efficiency, the example results in a required input power of approximately:

2.55 kW

The catalog then selects a combined gearbox arrangement suitable for the required high reduction ratio.

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.

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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 used in 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.

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K Series vs R Series Gearbox

Which One Should You Choose?

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 gearbox when the motor and driven shaft should remain inline or coaxial.

Explore our R Series Helical Gearbox →

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K Series Helical Bevel Gearbox vs Worm Gearbox

A K Series helical bevel gearbox is often preferred when a right-angle drive must operate continuously with high efficiency and high torque.

A worm gearbox remains advantageous where compact high reduction ratios, simple right-angle construction or specific self-locking characteristics 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.

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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.

SEND YOUR EXISTING GEARBOX DETAILS

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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

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K Series Output Shaft & Dimensional Support

The K Series catalog includes dimensional data for solid-shaft, hollow-shaft, flange-mounted, shrink-disc and motor-adapter configurations.

Standard solid-output-shaft diameters in the catalog range from approximately 25 mm for K37-class units to 190 mm for K187-class units, 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

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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.

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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 K Series 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.

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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 catalog range covers K37, K47, K57, K67, K77, K87, K97, K107, K127, K157, K167 and K187.

What is the maximum output torque of a K Series gearbox?

The catalog range starts at approximately 200 Nm for K37 and reaches up to 50,000 Nm for K187.

What is the motor power range?

Across the complete K Series product family, the supplied catalog covers motor combinations 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?

The supplied catalog specifies approximately 94% gear-unit transmission efficiency for the K Series. Actual drive-system efficiency depends on the final configuration and operating condition.

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 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.

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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:
Solid Shaft / Hollow Shaft / Shrink Disc:
Mounting Type:
Existing Gearbox Brand & Model:
Quantity:
Country:
Email:
Upload Nameplate / Drawing / Installation Photo:

GET ENGINEERING SELECTION

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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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