Multiple disc safety and start-up clutches LASI, LAAN

Multiple-disc safety clutches are frictional connecting elements for the transmission of torques. They limit the torque to be transmitted and thus protects the driving and driven machine against overloads. When overload occurs, the clutch slips with the dynamic friction torque (=nominal torque) and, after the slipping process is over, it reattains the static frictin torque.
We offer clutches in various sizes and torque ratings from 25 to 25000 Nm. There are two designs available. The smallest adjustable dynamic friction torque is 40% of the nominal torque rating. For vertical installation or of combustion- engine driven applications, please consult the manufacturer.

Types:
-type S: multiple-disc safety clutches, without bearing support, available with various casings:
E: with internal flange, open;
G: with internal flange, closed;
D: with external flange, open;
F: with external flange, closed;
usable for wet and dry running.

-type A: multiple-disc start-up clutches, bearing supported, closed for wet running.

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Description

Technical characteristics:

Type S:

Size range: from 2,5 to 2500;

Nominal torque range: from 25 to 25 000 Nm.

Casing design:
Casing D and E for multiple-disc safety clutches for wet running (S5, installation in the gear unit) and for multiple-disc safety clutches for dry running (S2, for open installation).
Casings F and G for multiple-disc safety clutches for wet running (S5, for open installation).
Other casing designs are available on request.

Material:

-inside body and casing: steel with a tensile strength of at least 490 N/mm² and a yield point of at least 275 N/mm²;
-discs: steel with a tensile strength of at least 600 N/mm²;
-friction lining: sintered bronze or pressed fibre material.

Lubrication:

The couplings for wet running are intended for submersed, centrifugal, splash or oil spray lubrication. We recommend an oil with a nominal viscosity of 30 cSt at 40°C and a corrosion degree of max. 2 as per DIN 51759.  Lubricating oil GH 85 W 90 (former GH 125) may not be used due to its incompatibility with the sintered bronze lining. With dry running couplings (S2), lubricants on the friction surfaces must be absolutely avoided.

Installation and operating conditions:
The couplings in open design can be used in any position, whereby the inside part of the coupling and the casing need to be supported independently.
Couplings in closed design are only suitable for a horizontal installation.
For the shaft seat, in the diameter range of 10 to 50 mm, a tolerance of k6 and a tolerance of m6 for the diameter range of over 50 to 180 mm is recommended.
The couplings are adjustable within the range of 40 to 100% of the nominal torque and can be readjusted in the event of a torque decrease due to wear.
A loading of the coupling by externel forces is not permissible.
The slippage has to be limited. We recommend that the coupling operates in connection with a slippage control device. At maximum torque, maximum rotational speed, as well as maximum switching frequency, slipping duration in excess of 2 s has to be avoided. If longer slipping cannot be ruled out, please consult the manufacturer.
The permissible ambient temperature is: ϑzul= -25 to +75°C.

Type A:

Size range: from 2,5 to 160;

Nominal torque range: from 25 to 1600 Nm.

Material:
Inside body: steel with a tensile strength of at least 490 N/mm² and a yield point of at least 275 N/mm².
Discs: steel with a tensile strength of at least 600 N/mm².
Friction lining: sintered bronze.

Lubrication:
We recommend oil with a nominal viscosity of 30 cSt at 40°C and a corrosion degree of max. 2 as per DIN 51759. Lubricating oil GH 85 W 90 (former GH 125) may not be used due to its incompatibility with the sintered bronze lining.

Setting and readjustment:
When selecting the size, a torque decrease, due to a wear, of 20% during the readjustment period is to be taken into account, that is, a safe transmission of power still has to be guaranteed with a dynamic frictional torque of 80% of the set value.
Tkn set is the set dynamic frictional torque, which can be 40 to 100% of the nominal torque Tkn. The values of the nominal torque refer to an oil viscosity of 30 cSt and an operating temperature of 40°C.
With a higher viscosity, the given nominal torques can not be attained.
Dependend upon the operating conditions (friction surface temperature, rotational speed, lubrication), the static frictional torque Tkh is 1,4 to 1,8 times greater than the existing dynamic frictional torque.

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