Belt Drives

Pulleys and Drums
Belt Models


The Belt Drives library offers the possibility of the realistic representation and analysis of general belt drives. These can be, for example,

  • drives with flat, vee or round belts,
  • timing belts,
  • multi-groove belts,
  • wires, ropes, cables, or threads.

Typical fields of application are the analysis of cranes or construction machinery with jib guy line and hoisting rope drives, frame or breast derricks with braces, cable cars, textile machines, exercise equipment (also with curved pulleys and drums), mechanisms, or belt drives at engines.

The basic model types of this library are based on Planar Mechanics domain and are divided into groups of pulley and drum models, belt models, and constraints. Their combination leads to arbitrary and complex structures of belt drives with fixed or loose pulleys. Furthermore, belt fixations and pulley positions can be controlled by joints and mechanisms also with respect to gravitational forces. It is possible to model closed (i.e. vee belt drives) or open belt drives (i.e. block and tackle systems). In any case, the model structures will be modular and distinct.

The basic model principles (functionality of connectors and connections) as well as coordinate system definitions are taken from the Planar Mechanics library.

In addition to this, models of Belt Drives library uses special types of Belt-Connection and Belt-Connectors for the transfer of specific belt properties in a system.

The following figures (especially figure 2) demonstrate the modeling principle with this library. Belt section elements (free strands) connect pulleys and drums. The contacting belt parts at pulleys or a drum are represented by the pulley and drum elements.
A belt model should be modeled always from K2 of the first pulley to K1 of the following pulley etc. for a positive belt motion direction.

Figure 1: Block and tackle system (3D-view)

Figure 2: Block and tackle system (diagram view)