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RK Series

Foot-mounted planetary gearbox with conical torque input

The RK series planetary gearboxes offer a compact and high-performance solution for demanding mobile and industrial applications. Their modular planetary gear design with tapered torque input ensures exceptional torque density in a small footprint.

Rated torque: 1,000 - 50,000 Nm

Motor power: 0.37 - 90 kW

Output speed: 0.1 - 780 rpm

Gear ratio range: 6 - 759

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Main features

Modular planetary design with solar, planetary and internal gearing
Conical torque input for optimal power transmission
Compact housing with mounting holes on the housing
High torque density thanks to multi-point load distribution
Advanced bearing solutions for high radial and axial loads
Multiple output shaft options (solid, fretted, hollow splined, solid splined)
Flanges suitable for AC and hydraulic motors

Product range

The RK series includes 9 different sizes covering a torque range from 1,000 to 50,000 Nm, specially designed for mobile and industrial applications requiring an optimal power/size ratio.

Detailed technical data

Setting	Value	Unit
Nominal torque	1,000 - 50,000	Nm
Engine power	0.37 - 90	kW
Output speed	0.1 - 780	rpm
Report range	6 - 759	-
Typical yield	94-97%	-
Degree of protection	IP65, IP66, IP67	-
Serving temperature	-25°C to +80°C	°C

Size chart

Reduced size	Report range [i]	Nominal torque [Nm]	Shaft diameter/length [mm]
R.11..K	7 - 691	1,000	Ø50/82
R.12..K	7 - 691	2,000	Ø50/82
R.15..K	6 - 715	3,100	Ø60/105
R.16..K	6 - 715	5,000	Ø60/105
R.19..K	7 - 759	8,500	Ø80/130
R.23..K	11 - 614	12,500	Ø90/170
R.24..K	11 - 614	20,000	Ø90/170
R.27..K	8 - 604	25,000	Ø110/210
R.29..K	8 - 501	35,000	Ø120/210
R.35..K	8 - 523	50,000	Ø140/200

Technical advantages

Characteristic	Profit
Planetary design	Exceptional torque density and maximum compactness
Conical entrance	Optimal power transmission and precise alignment
Special bearings	High radial and axial load capacity
Multiple tree options	Adaptability to different installation configurations
Modular design	Flexibility and ease of maintenance

Available options

Servomotor-specific connection flanges
Electromagnetic brakes (24V/230V/400V)
Anti-deflection application
Pulse encoder 512 - 1024
External fan cooling for applications with variable speed drives
Special seals for harsh environments
Glass oil level indicator
Lubrication options adapted to extreme conditions

Areas of application

The RK series planetary gearboxes are ideal for mobile and industrial applications requiring high torque in a compact size:

Construction equipment - Hydraulic excavators, loaders, bulldozers
Agricultural machinery - Combine harvesters, tractors, harvesting machines
Mobile equipment - Mobile cranes, aerial work platforms, work platforms
Industrial robotics - Robotic arms, rotation axes, positioners
Renewable energy - Solar trackers, orientation systems

Competitive advantages

Maximum compactness

Planetary technology enables the highest reduction ratios in the smallest footprint on the market, ideal for applications where space is limited.

Exceptional yield

With efficiencies reaching 97%, RK gearboxes minimize energy losses and reduce consumption, while offering a longer service life thanks to reduced wear.