Contents

A structure that shares the load across three teeth
Three gearbox types, a broad family of housings
Key design features
Modular options at input and output
Thermal power and auxiliary cooling
A wide range of applications

Applications that require high torque in limited space make it essential to strike the right balance between size and capacity in drive design. I-MAK Redüktör’s IPR/IPRK series of planetary gearboxes was developed for this need. According to the company’s data, the series covers a torque range from 1,000 Nm to 2,500,000 Nm, more than 20 standard housing sizes and gear ratios ranging from 3.55 to 9,793.30. Drilling, marine, mining, mobile equipment and general industrial drives are among the main areas the series targets.

A structure that shares the load across three teeth

The key feature that makes the planetary gear system advantageous is the way power is transmitted. Whereas in a spur gearbox the force is transmitted by a single tooth mesh, in a planetary gearbox the torque of the central sun gear is shared across three separate tooth meshes. This structure means small gearbox dimensions, a compact design and low weight. The I-MAK catalogue describes the use of planetary gearboxes in power transmission as the most modern answer to demands for a simple structure and applications in small spaces. The series is designed to drive all kinds of machinery and equipment, and the gearboxes can be coupled directly or indirectly to an electric or hydraulic motor.

“The use of planetary gearboxes in power transmission is the most modern answer to demands for a simple structure and applications in small spaces.”
I-MAK Redüktör, Planetary Gearboxes Catalogue

Three gearbox types, a broad family of housings

The series includes three basic gearbox types: the IPR planetary gearbox with an inline design, the IPRK with a bevel gear input and the IPRW with a worm gear input. The catalogue defines housing sizes from 101 to 149, and the reduction stage can be selected from S1 to S5. This makes it possible to build both compact low-ratio solutions and multi-stage, high-ratio drives within the same family. The company states that tandem configurations are also possible.

Key design features

High torque values head the list of design features in the catalogue. The tapered roller bearings used in the M and FV models provide high axial and radial load capacity at the output shaft. The parts inside the gearbox are connected by splined joints rather than keys, which helps the connections operate with a high level of safety. The planet gears are mounted on self-centring carriers, ensuring optimum load distribution between them. High efficiency is also among the series’ standout features.

Modular options at input and output

The input options are quite extensive. The gearbox can be used with an input shaft, a motor adapter and an electric motor, and can also be paired with orbit, radial piston and axial piston hydraulic motors via hydraulic motor adapters. A direct (negative) brake adapter and a modular brake adapter are also among the input options.

On the output side, the catalogue defines 12 different output versions. Output shafts are offered in different sizes and types, including splined shaft options in accordance with DIN 5480. Output accessories such as flanges, internally splined bushes and splined shafts make it easier to connect the gearbox to the driven machine.

Thermal power and auxiliary cooling

In planetary gearbox selection, thermal power is as decisive as mechanical capacity. The catalogue defines thermal power as the maximum power that can be transmitted in continuous operation with splash lubrication without the oil temperature exceeding 90°C. The table values are given for continuous operation, an input speed of 1,500 rpm, ISO VG 150 oil, an ambient temperature of 20°C, horizontal mounting and no additional cooling. For foot-mounted IPR 111–113 types, these values can be taken as 15 percent higher.

Auxiliary cooling is recommended if the applied power exceeds the thermal power or if the gearbox operates in a confined space with poor air circulation. The main elements of the system are an oil-air heat exchanger, a fixed-displacement gear pump, an electric motor, a 60 μm filter in the return line and two thermostats mounted on the gearbox. One thermostat is set to the minimum operating temperature and the other to the maximum temperature; when this limit is exceeded, an alarm can be triggered or the gearbox can be stopped. On request, flow meters, pressure switches, different filtration options and thermostats for different operating temperatures can also be supplied.

A wide range of applications

The catalogue emphasises that planetary gearboxes are used in all kinds of applications, stationary or moving, industrial or mobile: the chemical and plastics industries, machine building, food, construction, mining, agriculture and forestry, transport and lifting, marine, wind turbines and energy. Conveyors, mixers, the hoisting, slewing and travel mechanisms of cranes, and dredging equipment are just a few of the applications listed in the load classification tables.

During the selection process, users can take advantage of the product selection tool and the 3D drawing search service on I-MAK’s iGuide portal. The company states that the IPR/IPRK series is part of a portfolio containing more than 1,000,000 product references.

IPR/IPRK models: maximum torque and bore diameter

Model	Max. torque (Nm)	Bore diameter (mm)
IPR/IPRK 101	1,100	Ø 42
IPR/IPRK 103	1,700	Ø 42
IPR/IPRK 105	3,520	Ø 65
IPR/IPRK 107	5,110	Ø 65
IPR/IPRK 109	7,020	Ø 80
IPR/IPRK 111	12,210	Ø 90
IPR/IPRK 113	18,020	Ø 90
IPR/IPRK 115	18,020	Ø 90
IPR/IPRK 117	30,760	Ø 110
IPR/IPRK 119	30,760	Ø 110
IPR/IPRK 121	37,500	Ø 120
IPR/IPRK 123	60,800	Ø 140
IPR/IPRK 125	69,310	Ø 160
IPR/IPRK 127	99,000	Ø 170
IPR/IPRK 129	140,900	Ø 180
IPR/IPRK 131	184,000	Ø 230
IPR/IPRK 133	215,000	Ø 230
IPR/IPRK 135	332,800	Ø 295
IPR/IPRK 137	390,000	Ø 295
IPR/IPRK 139	572,300	Ø 340