Marek M. Poncyliusz, PhD The Counter Rotational Turn Abilities of Track Earthmovers (on The Base of Track Loaders and Multi Terrain Loaders)

Special kind of track machines manoeuvre i.e. counter rotational turn was analysed in the paper. This way of travelling is adequate mainly for track loaders and for multi terrain loaders i.e. for track version of skid steer mini loaders (“bobcats”).

Simultaneously the necessity of making that motion with as small as possible ground destroying effect is obvious from agricultural point of view.

It is easy to explain that turning parameters are connected with main dimensions of tracks therefore we should pay attention for looking optimum shape of driving units.

In the paper the algorithm of counting and then drawing the 2-D moving track shoe’s path was described. For the comprehensive track machines (loaders and MTLs) product line the analysis of theirs driving units parameters (track length L and track gauge B) as well as of driving physical features like track velocity vteoretical and sleep i was done to obtain the counter rotational turn with possible smallest shoes’ displacement.

Author prepared the spatial visual presentation of cumulated time of track shoes vertical load exerting on precisely described area of turning during counter rotating.

Some conclusions for track driving units producers were drawn as well as expectations of upgrading in the future the more complicated turning analysis were sketched.