MAAG® GEAR

GEAR SYSTEMS

CPU Gear Unit

The high-performance gear
unit to drive your ball mill

WE DISCOVER POTENTIAL
 Reliable planetary
gear unit
Developed in 1966, our two-stage planetary gear unit guarantees
optimum power transmission and speed reduction for your ball mill.
The standard for central driven ball mills today, our MAAG® CPU Gear
drives hundreds of raw and clinker mills all around the globe.

Key benefits
■ ■ ■ ■
Power efficiency High operational Low-cost maintenance Optimised to suit
exceeds 98.9% reliability and availability with long-life gearing customers’ unique
and journal bearings specifications
Reliable ball mill operation ranges from 1,000 to 10,000 kW, the MAAG CPU Gear Unit has the
with our efficient CPU Gear Unit breadth to adapt output speed to your specifications. We can also
The design of our MAAG CPU Gear Unit has been copied many add additional features as water injection or a condition monitoring
times, but never equalled in efficiency, quality and ease of installa- system.
tion and maintenance. The compact central drive system delivers
dependable power for raw- and cement grinding in your ball mill. Compact central drive
Finally, the space-saving design of our two-stage planetary gear
Planetary gear for maximum power efficiency unit means that it takes up less room than traditional, multistage
The simple design holds the secret to the gear unit’s high efficiency. spur gear boxes. While it may be smaller and lighter, it never
Two co-axial planetary gear stages are arranged one after the other. compromises on power delivery.
Each stage includes three planet wheels mounted in a rotating
planet carrier and an internal toothed coupling guarantees reac- Quality delivers long life
tion-free power transmission from the first planetary stage to Our modern manufacturing methods and tooling machines enable
the second. This setup is the most efficient gear arrangement us to deliver state-of-the-art gear units. This two-stage planetary
and guarantees optimum power flow from the main motor to your gear offers an impressive service life, hand-in-hand with minimum
horizontal mill with the fewest possible rotating parts, tooth contacts maintenance requirements:
and bearings. ■■ Fewer rotating parts and bearings improve overall reliability

■■ Case-hardened and grinded tooth flanks with profile correction

Your requirements for the grinding process determine the configu- are very durable and guarantee optimum tooth contact during
ration of this gear unit, which can be tailored to suit many applica- operation
tion areas. All installations take into account local circumstances ■■ The slide bearings with infinite lifetime complete the durable

and plant specifications, such as motor and mill speed. With power design of this central drive gear unit.

Planet wheel

Slide bearing

Slide bearing
Planet carrier
Planet wheel
Sun pinion
Slide bearing

Planet carrier

Sun pinion

Internal toothed coupling

CPU Gear Unit 3

 Couplings deliver
endurance and ease
Our MAAG® CPU Gear Unit is based on well-proven standardised design,
whatever your required power range. With specification to ensure safe
and reliable operation, our two-stage gearbox has you covered.

Toothed couplings ensure optimal power flow The ZEXF coupling installed between main motor and gearbox is
The standard scope of supply of our CPU Gear Unit includes also designed according our own design. Beside the possibility to
the couplings connection our gear unit to the main motor and compensate alignment deviations resulting from thermal expansions
to your ball mill. and changing operating conditions, this coupling provide a limited
axial displacement allowing to eliminate an axial bearing either
The ZCF low speed coupling is installed between your horizontal in the motor or the gearbox. This coupling provides also electrical
mill and the gearbox. The unique design of our toothed coupling insulation between the motor and the gearbox and keeps the
combining a high degree of freedom of alignment with efficient bearings and toothing free from electro-corrosion.
torque transmission. Thermal expansions and mechanical deflec-
tions resulting from operating conditions are safely absorbed by the Couplings support easy maintenance
ZCF coupling, and only the torque is transmitted to the mill through Maintaining our CPU Gear Unit is very simple. The easy disassembly
the torsional shaft. Upon request a water injection system can be of the ZEXF coupling and the vertically splited casing of our CPU
installed on the ZCF coupling. Gear Unit ensure that the first planetary stage can be displaced
towards the motor. No other equipment needs to be moved or
disassemble to get full access to the internals of our gearbox.

4 CPU Gear Unit

 Get the most from
this effective gear unit
A broad collection of auxiliary systems completes our MAAG® CPU Gear Units.
Lubrication system, couplings and auxiliary drive are must-have. But we also provide
our monitoring system and service packages round out the scope of delivery.

Oil supply unit keeps your gear running stage. With this enhanced information, we help you plan
Our gearbox is lubricated by an external lube oil supply unit which main­tenance and servicing in advance – reducing downtime
is ideally located beneath the mill drive motor. The oil supply unit and keeping your plant running smoothly.
is standardized so that one size fits several gearbox sizes. It is
equipped with an electrical low-pressure pump, switchable double Auxiliary drive for maintenance purpose
oil filter, water cooler and the necessary measuring instruments The auxiliary drive is intended to slowly turn the mill for mainte-
in order to monitor the correct operation of our CPU Gear Unit nance works or for the even cooling down of the mill. Placed
lubrication. Top priority is given to the operational reliability. at the rear end of the motor the auxiliary drive is equipped with
a planetary gearbox and a fluid coupling to limit starting torque and
Beyond a basic condition monitoring system to provide smooth acceleration. The overrunning clutch between
with MAAG® Predicta the auxiliary drive and the main motor automatically disengage the
Our condition monitoring system Predicta does much more than auxiliary drive when the motor is started. A break can be supplied
triggering inadmissible operating conditions. It lets you set up as option on request. It allows to lock your ball mill in position
condition-based preventive maintenance that uses continuous during maintenance.
monitoring and data analysis to detect wear and tear at an early

Low speed coupling ZCF High speed coupling ZEXF

MAAG® CPU Main motor Auxiliary Drive

Ball mill

Oil supply unit

CPU Gear Unit 5

 Precision is
a question of quality
Our products are known for their high reliability. ­Manufactured in state-of the-art production
plants, enriched with many years of experience, supported by a wide range of services.

Quality policy Our quality policy centers on the importance of meeting our
Our certification according to the latest ISO 9001:2008 standards customers’ requirements. To reach that our management continu-
and our commitment to create strong relationships with our ously revues and establishes the quality objectives and our
customers, suppliers and employees has the clear target to employees are committed to the company’s Management System,
establish us as a trustworthy, reliable and professional partner. as well to the continual improvement of the system and the entire
This commitment includes providing the markets with high quality organization. Each employee is aware of the vision and strategy
and high value solutions, products and services to support we pursue and works in a culture of opportunity.
productivity and sustainability of our customer.
With our suppliers and external partners, we cultivate an open
With our process management system, we endeavor to meet communication and collaborate on performance-oriented results.
and exceed quality standards and provide adequate resources
to support the quality system.

6 CPU Gear Unit

 A pioneer of
modern gear technology
For more than 100 years, the MAAG® Gear brand has successfully
lived up to its founding vision and values.

As part of the global FLSmidth Group, the business continues to customers sustainability. The continuous incorporation of experi-
be the preferred full-service provider for the heavy-duty industry. ence, new technical solutions and latest manufacturing techniques
As leading technical developer of drive solutions for the cement into the production process combined with intensive development
and minerals industries we remain focused on our customers and training of our engineers assure best understanding of how to
productivity. design and operate a gear unit to lengthen its life cycle. A constant
willingness to innovate and close collaborations with our customers
Engineering and production have led to ensure that MAAG gear units operate reliably through-
Since introducing with great success in 1966 the technology of mill out the world under toughest conditions.
gear units to the cement industry we have sold over 6000 MAAG™
gear units and 1000 girth gears. In todays’ setup, Engineering and Product range
Production take place in 4 modern plants located in Italy, Switzer- Todays’ product range includes various drive solutions and
land, Poland and India. maintenance systems for all types of applications needed in various
industries. We also manufacture single components such as bevel
Our strength sets, girth gears and various replacement parts.
We support our customer’s expecations with highly efficient
products. The key of success lies in the combination of modularized All MAAG gear units are available as standard solutions
solutions and compact design. Careful material selection and or customized to its specific application.
unique production accuracy enables our gear units to increase

CPU Gear Unit 7

FLSmidth A/S
Vigerslev Allé 77
2500 Valby
Denmark

Tel. +45 3618 1000

Fax +45 3630 1820
info@flsmidth.com

www.flsmidth.com

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C 10-19 500-1-ENG V3

Copyright © 2019 FLSmidth. ALL RIGHTS RESERVED. FLSmidth is a (registered) trademark of FLSmidth.
This brochure makes no offers, representations or warranties (express or implied), and information and
data contained in this brochure are for general reference only and may change at any time.