Assemblages de verrouillage

Locking assemblies (also called "conical clamping elements" or "internal clamping elements")  are used in mechanical engineering to create a frictional shaft-hub connection. The Locking assemblies connects the hub of a gear, for example, to a shaft by means of a frictional connection. This backlash-free connection between shaft and hub allows reliable transmission of torques as well as axial forces. Depending on the design of the clamping set, high bending moments can also be transmitted with this type of connection.

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Functional principle

Locking assemblies consist of one or two conical pressure rings and a conical clamping sleeve, depending on the design. By tightening the clamping screws with the specified tightening torque, the conical pressure rings are drawn onto the conical surface of the clamping sleeve. This process creates a radial force both inward and outward. While the outside diameter increases, the diameter inside the clamping sleeve decreases. This creates a frictional connection between the locking assembly (cone clamping element) and the shaft as well as the hub.

In contrast to a groove in conventional keyway connections, the stresses at the shaft are distributed evenly over the entire contact surface of the locking assembly. The uniform stress distribution produces a reliable, free positional and, above all, wear-free connection. This often leads to a smaller shaft size and therefore reduced weight of the design.

At a glance

  • Easy assembly and disassembly
  • Transmittable torque from 11 Nm to 1.870.000 Nm
  • Nominal diameter from 6 mm to 800 mm
  • Also available as stainless steel version
  • Special designs for higher bending moments are available

 
 

Versions

Locking assemblies are available in a wide variety of designs and types. In addition to the torsional or bending moments to be transmitted, the available installation spaces as well as loads also play an essential role for the right product selection. No matter whether self-centering, low surface pressure, high speeds or stainless steel versions for the food- and chemical-industry.

Compliant cone locking assemblies

The more compliant locking assemblies have a total of four conical functional surfaces and several individual components. Due to the design and the resulting larger cone angle, the compliant cone locking assemblies are not self-locking. This means that it is not necessary to press off the thrust rings during disassembly. Since the pressure rings are not moved axially on the shaft during assembly, there is no axial displacement between the shaft and hub.

Rigid cone locking assemblies

Rigid cone clamping elements have only one or two conical functional surfaces. This results in different technical properties than the more compliant cone locking assemblies. Due to their design, rigid cone clamping elements can transmit higher bending moments. In addition, this design has the property of better self-centering and self-locking. Another property is that the clamping screws are not subjected to any further loads by incoming forces during operation after assembly. This increases the safety and service life of the rigid cone clamping elements.

 

In general, the various locking assemblies can be subdivided according to the type of application and the available installation space:

Short locking assemblies are usually able to absorb low to medium torsion and bending moments.

Wide locking assemblies are used for high to very high torsion and bending moments.

 
 
 

Product overview

Type 3003 _________________________ Low torque transmission Medium bending moments  Short installation lenght  
Type 3003
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Low torque transmission
Medium bending moments
Short installation lenght
Type 3003 Plus _________________________ Low torque transmission Medium bending moments  Short installation lenght  
Type 3003 Plus
_________________________
Low torque transmission
Medium bending moments
Short installation lenght
Type 3006 _________________________ Medium torque transmission Medium bending mom. Short installation lenght 
Type 3006
_________________________
Medium torque transmission
Medium bending mom.
Short installation lenght
Type 3006 Plus _________________________ Medium torque transmission Medium bending mom. Short installation lenght 
Type 3006 Plus
_________________________
Medium torque transmission
Medium bending mom.
Short installation lenght
Type 3012 _________________________ Very high torque transmission High bending moments  Wide installation lenght 
Type 3012
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Very high torque transmission
High bending moments
Wide installation lenght
 
Type 3014 _________________________ High torque transmission  Medium bending moments  Wide installation lenght  
Type 3014
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High torque transmission
Medium bending moments
Wide installation lenght
Type RB _________________________ Medium torque transmission Medium bending mom. Average installation lenght  
Type RB
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Medium torque transmission
Medium bending mom.
Average installation lenght
Type 3015 _________________________ Average torques Average bending moments  Average installation length 
Type 3015
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Average torques
Average bending moments
Average installation length
Type 3015.1 _________________________ Medium torque transmission Medium bending mom. Average installation lenght  
Type 3015.1
_________________________
Medium torque transmission
Medium bending mom.
Average installation lenght
Type 3015 DK _________________________ High torque transmission Medium bending moments Average installation lenght 
Type 3015 DK
_________________________
High torque transmission
Medium bending moments
Average installation lenght
 
Type 3020 _________________________ High torque transmission Low bending moment takes place  via the hub Short installation lenght 
Type 3020
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High torque transmission
Low bending moment takes place
via the hub Short installation lenght
Type TAS 110 _________________________ Medium torque transmission Medium bending moments Small hub diameter 
Type TAS 110
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Medium torque transmission
Medium bending moments
Small hub diameter
Type TAS 130 _________________________ Medium torque transmission Medium bending moment Average installation lenght 
Type TAS 130
_________________________
Medium torque transmission
Medium bending moment
Average installation lenght
Type TAS 131 _________________________ Medium torque transmission Medium bending moments Average installation lenght 
Type TAS 131
_________________________
Medium torque transmission
Medium bending moments
Average installation lenght
Type device 8006 _________________________ Low torque transmission Small installation space    
Type device 8006
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Low torque transmission
Small installation space

 
Type 4006 _________________________ Very high torque transmission Very high bending moments Wide installation lenght  Especially for pulleys 
Type 4006
_________________________
Very high torque transmission
Very high bending moments
Wide installation lenght
Especially for pulleys
 
 
 

The benefits

For industry, the performance capabilities of individual components, cost advantages, reduction of assembly times or increased lifetime play an important role in the fastening of components on rotating shafts.

A conventional method in the past was the connection via a keyway. With this type of connection, a keyway/groove is milled into the shaft. This is also done in the hub. However, milling these keyways is costly and time-consuming. Another disadvantage is also the reduction of the transmittable torque due to the weakening of the shaft. Often, a splined connection also creates movement and eventual backlash, which can affect the accuracy of a machine system and create the risk of failure.

With a friction-locked shaft-hub connection by using a locking assembly, this risk can be avoided because there is no play. The use of a locking assembly therefore ensures precision and safety. In addition, costly manufacturing processes, such as milling or grooving, can be saved.

Another advantage of using a locking assembly is the positioning on the shaft. Unlike a groove, the locking assembly can be moved freely on the shaft. Another advantage of using a locking assembly is the positioning on the shaft. Unlike a groove, the locking assembly can be moved freely on the shaft. Series such as the TAS 3015 DK locking element prevent direct movements on the shaft during assembly. This avoids costly damage to the shaft during assembly.

 
 

Assembly

It is installed by inserting the locking assembly between the components and the subsequent tightening of the screws. By using conical surfaces, the outer diameter increases and the inner diameter reduces. Radial pressure is built up.

The clamping forces are provided and controlled by the screws (force-controlled). This allows the direct compensation of the clearance between shaft and hub. The supplied locking devices are ready for installation. To achieve proper operation with a sufficiently high coefficient of friction, the contact surfaces between shaft and hub must be clean and slightly oiled. Machine oil must be used as a lubricant. The functional surfaces of the locking assembly, threads and screw heads are prepared at the factory with oil film.

 
 
 

Application examples

The use of locking assemblies is diverse and covers many different industrial sectors. From classic mechanical engineering, as well as conveyor and drive technology, to the packaging and food industries, to name just a few examples.

Finally, the locking assemblies enables precise fastening of hubs on shafts or axles, as for example in the fixation of gears and sprockets. In addition, our clamping elements/locking assemblies find applications in conveyor belt drums or crushers. In the food and also petrochemical industry, stainless versions of the locking assemblies are often used in filling or agitating equipment.

Locking assemblies are used in the packaging industry for fastening pulleys and for transporting objects within the machine.

© Copyright Lütgert & Co. GmbH | Friedrichsdorfer Str. 48 | 33335 Gütersloh (Allemagne) | Téléphone : +49 5241 / 74070    info@luetgert-antriebe.de | Table des matières| Mentions légales| Politique de confidentialité | Politique de confidentialité courriel

 

© Copyright Lütgert & Co. GmbH
Friedrichsdorfer Str. 48
33335 Gütersloh (Allemagne)
Téléphone : +49 5241 / 74070
info@luetgert-antriebe.de
Table des matières
Mentions légales
Politique de confidentialité
Politique de confidentialité courriel

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