The design of the two- stage planetary gear unit guarantees optimum power transmission in the 1000 to 10,000 kW range.

CPU gear units consist of two gear stages, the casings of which are bolted together. The internal toothed coupling guarantees reaction-free power transmission from the first planetary stage to the second. The gear unit is supported on the foundation with four feet and is attached with four anchor bolts.

This results in simple alignment with a very short installation time.

Drive takes place via a MAAG toothed coupling. The main components of the two gear stages are a sun pinion with three planet wheels and an inner gear ring. The drive to the mill is transmitted via MAAG toothed coupling with a torsion shaft. The complete drive group is coaxially arranged.

The divided casings are solid, welded steel structures.

The high quality journal bearings have a very long life. They are provided with babbitted metal lining and scraped.

The planet shafts are also provided with babbitted metal lining and scraped. They are held in place by solid, welded and accurately machined planet carriers.

The spur teeth of the sun pinion and the planet wheels are casehardened using the CARBOMAAG method. They are ground on MAAG SE-2-2 and SE-402 grinding machines, achieving a quality level of Q3 or better to ISO 1328-1.

The tooth flanks of the sun pinions have both profile and longitudinal corrections to fully compensate for deformations occurring under load.This method guarantees optimum tooth flank contact and very long life. The inner gear rings are heat-treated. The teeth are finished on a MAAG gear-shaping machine with a chisel shaped tool. A quality level of Q5 or better is achieved.

The gearing is lubricated by a closed-circuit oil system.

The oil supply unit is ideally located beneath the mill drive motor. A cooling and/or heating system is part of the standard equipment. An optimal operating temperature is therefore guaranteed, regardless of fluctuations in ambient temperatures. The high efficiency remains constant and operational reliability is unaffected. The oil system is controlled and monitored automatically. Top priority is given to guaranteeing operational reliability.

Page 2: Type: CPU, Horizontal Heavy Duty Gear Unit for Driving Ball Mills in the Cement Industry.

MAAG introduced the technology of heavy-duty planetary gear units for the cement industry with great success in 1965.

Experience, new technical findings and the latest manufacturing techniques are regularly incorporated into the production process. A constant willingness to innovate and the close collaboration with our customers have contributed towards MAAG gear units being reliably used throughout the world, under the toughest conditions.

• Types from CPU-11 to CPU-83

• Mature design

• Compact, two stage construction (two planetary stages)
• Top quality
• High reliability
• Very high efficiency
• Power range from approx. 1000 to 10,000 kW

The design of the gear unit is optimized to suit the power required, the motor/mill speed and local circumstances.

Full account is taken of customer specifications.

The latest machines and technical aids are used in manufacturing

Production and all activities are monitored by the internal quality assurance system (certified by Det Norske Veritas) in strict compliance with ISO 9001.

Gear units are tested and logged in detail on our own test bed prior to delivery.

The compact design simplifies transport and reduces assembly time.

Through continuous monitoring of our production schedule, our clients are provided with up to date progress of a project any time.

Customer care by trained and skilled personnel guarantees professional after sales support.

Maintenance work must be performed according to the MAAG instructions. Special service contracts are available if customers prefer.

Spare parts are available throughout the life of the gear units.

MAAG can be contacted within a very short time thanks to our worldwide network of agents.

Our skilled service specialists are ready to provide rapid and expert assistance at any time.