CB 90A/ CB 120A Disc Brakes for Wind Energy Turbines

Product description
CB 90 A/ CB 120 A
Disc Brakes for
Wind Energy Turbines
CB 90 A and CB 120 A
Simply our best
CB 90 A and CB 120 A
Quiet, durable, compact, reliable
GKN Stromag WEP, specialising in „Wind Energy
Products“, is a company of GKN Stromag AG,
which consists of experts from GKN Stromag
France (SIME disc brakes) and an additional
team from GKN Stromag AG/Unna. For over 25
years, Stromag France has enjoyed an excellent
reputation as a developer and manufacturer of
intelligent brake systems for wind turbines and as
such has become an indispensable partner in the
field of wind energy. At GKN Stromag WEP, design
and global sales know-how is combined to provide
highly efficient solutions for wind turbines.
Development and sales engineers at GKN
Stromag work together under the umbrella
of GKN Stromag WEP. They design and
produce tailor-made products for modern
wind turbines. The test centre for disc brakes
remains in La Guerche (France). Test stands
enable development engineers to confirm their
theoretical basic calculations and ensure that
customers are provided with tried and tested
and highly reliable products for their particular
applications. In addition, test facilities at
various universities are also used.
An example of the innovativeness of GKN Stromag WEP are the
yaw brakes CB 90 A and CB 120 A.
-2-
What customers would like:
“A high-performance brake at an affordable price,
if possible with the benefit of silent braking.”
Answer:
“The CB 90 A and CB 120 A. FEM tested yaw brakes designed
to give 20 years of service.”
The Innovation: A patent pending yaw
brake with partitioned pads to considerably
reduce the load on the brake pad and noise
compared to conventional designs. Using the
Finite Element Method (FEM), a comparison of
the principal stresses occurring in a conventional
brake (Fig. 1) as opposed to the CB 90 A (Fig.
2), shows an effect that is clearly perceivable.
Calculated on the same basic conditions, the
result could not be more different.
Fig. 1
The load in the case of the CB is in the green
area. Based on these calculated stresses, the
theoretical service life is 20 years according
to the rules of German Lloyd. A relatively small
brake pad in conjunction with a friction lining
specially developed for the application results in
silent braking. The pads of the CB 90 A/CB 120 A
are easy to replace; the brake calipers allow for
easy wear monitoring and incorrect fitting of the
pads is prevented.
Fig. 2
-3-
CB 90 A and CB 120 A
Features
Braking force up to 205KN (CB 120 A 537KN)
Quick and easy brake pad replacement
Simple wear control via sensors
Pads cannot be fitted incorrectly (Poka-yoke)
-4-
The relation between product and
customer benefits is redefined by the
yaw brakes “CB 90 A and CB 120 A“
of GKN Stromag WEP!
-5-
CB 90 A and CB 120 A
The brake calipers of the CB series are characterised by a high braking effect and
user-friendly maintenance; these advantages result from patent pending innovations:
PARTITION:
The force generated when braking is transmitted via the brake pads to both
halves of the brake caliper housing. The local stresses occurring at the point of
force introduction reduce the service life of the brake caliper. The number of force
introduction points is increased by the partition in the housing, which reduces
local stresses. The braking force of the CB 90 A is distributed between a total of
four and that of the CB 120 A between six partitions. This allows higher braking
forces to be generated without degrading the service life of the brake caliper.
WEAR MONITORING:
Wear monitoring takes place quickly and easily through a hole in the brake pad.
Even in poor visibility conditions and where freedom of movement is restricted,
the wear condition can easily be determined by depth measurement or more
easily using our optionally available wear measuring pin. The function of the
measuring pin is shown in Fig. 3.
Fig. 3
The GREEN mark on the test rod is an indication to maintenance personnel that the friction lining
does not need to be replaced.
The Yellow mark on the test rod is an indication to maintenance personnel that the friction
lining needs to be replaced during the next maintenance routine.
The red mark on the test rod is an indication to maintenance personnel that the friction lining
needs to be replaced immediately.
-6-
FRICTION LINING REMOVAL
Removing the friction linings of yaw brakes is often problematic. The tight fit of
the friction lining in the housing chamber coupled with the possibility of abraded
particles entering the gap, make removal very difficult. The friction linings of the
CB series have a centered tapped hole in the friction lining carrier which allows
maintenance personnel to screw in a jack screw, whereby the extended piston is
moved back and the worn friction lining easily forced out.
FRICTION LINING FITTING
When fitting friction linings of the CB series, incorrect fitting by maintenance
personnel is prevented. The friction lining can only be fitted with the pad facing
the brake disc and the pad carrier facing towards the piston. The trick is the
asymmetric geometry of the friction lining carrier and chamber, which prevents
incorrect fitting. The asymmetry is realised by different sized chamfers in the
friction lining or the friction lining chamber radii. A foolproof friction lining fitting
method is thus ensured by simple means, also known as the Poka-yoke principle.
User-friendly friction
lining removal
Partition reduces load
-7-
Friction lining geometry prevents
incorrect fitting (Poka-yoke)
GKN Land Systems© 2013
PO Box 55,
Ipsley House,
Ipsley Church Lane,
Redditch,
Worcestershire B98 0TL
P: +44 (0)1527 517 715
Hansastraße 120
59425 Unna
P: +49 2303 102-0
F: +49 2303 102-201
www.gknlandsystems.com
[email protected]
www.stromagfrance.com
[email protected]
The GKN Stromag AG
is a company of GKN Land Systems
Find out more about GKN Stromag
global trade representatives
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GKN Stromag AG

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