Flat belts

Drive belts and transportation belts

Flat belts are still very popular for various drives. Besides the long lifetime and the simple handling, another reasons is the high efficiency of up to 98%.

For a long time the drive belts have been used as transmission belts and nowadays are again increasingly used as the lifetime has clearly improved due to the development of the material technique (elastomers).

Flat belt as drive belt 
Flat belt as drive belt

We are main partners of leading flat belt producers. For every drive concept and transportation situation we choose and provide the appropriate belt.

Upon request we take care of the drive setup or check all existing drives for possible potential improvements.

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Multi-pulley operation 
Multi-pulley operation
Angle drive 
Angle drive
Crossing drive 
Crossing drive

Belt structure

A flat belt often consists of various layers which are connected via intermediary layers.

The upper side and underside are referred to as top layers and can consist of the following materials:

  • Chrome leather (L)
  • Elastomer (G)
  • Polyurethane (U)
  • Tissue (T)
  • Polyester fibre fleece (N)
  • High Grip / Medium Grip ®

The medium layer is the tension member that consists of:

  • Polyester fabric
  • Polyester cord
  • Aramid cord
  • Polyamide fabric
  • Polyamide strip
  • Polyurethane film

To get a better understanding of these belt drives, it is important to know, that the outer area can only realize a limited power transmission with one cord.

Setup flat belt 
Setup flat belt
Crowned pulley 
Crowned pulley
Flat belts by the metre 
Flat belts by the metre

Power transmission

The power is transmitted with frictional locking between belt and pulley. With the different surfaces the belt can be adjusted perfectly to the surroundings. Chrome leather for example is suitable for belt pulleys with an oil and water layer as the leather absorbs the humidity retrieving the friction value.

Also with generator drives chrome leather is a popular solution to reduce the so-called “stick-slip-effect“, which usually causes performance fluctuations on the generator.

Why does the flat belt stay on the pulley and does not run off?

Flat belt pulleys are carried out crowned according to DIN 111 or ISO 22. At least one pulley in the drive should be crowned.

Due to the curvature of the pulley, there are different circumferential speeds on the pulley. The fastest circumferential speed is on the curvature vertex.

Each point on the belt´s cross section tries to reach the fastest circumferential speed. Thus the belt centres around the centre of the pulley.

At a glance

  • Large shaft distances can be bridged, creating assembly space for further aggregate
  • Low maintenance cost as no greasing required
  • Smooth and noise free operation
  • Fast circumferential speeds up to 200m/s
  • High efficiency up to a 98% efficiency
  • Operation of several aggregates with only one drive belt possible
  • Open, crossed and limited belt guide possible
  • Shaft position can be parallel or crossing
  • Every belt length possible through assembly
  • Noise free operation

The benefits


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© Copyright Lütgert & Co. GmbH
Friedrichsdorfer Straße 48
33335 Gütersloh

Phone: +49 52 41 / 74 07 0
Legal Notice

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