Proceedings of SerbiaTrib '13

using number possibilities of 3D modellingsoftware packages.8623Figure 1. Sub-divided components of tribometer modelFirst of all, whole design of the tribometer isbased on container with a plate and oil (1), placedon a horizontal linear guides (2), movingalternately, while pin is stationary. Pin bracket (3)is set to vertical linear guides (4) and given loadson the pin passed through the bar, which is also adynamometer for measuring of friction force. Drivesystem for reciprocation motion is pneumatic (5)with pneumatic cycle counter (6).On container with a plate (1) displacementtransducer is fixed (7), with function to measure, inreal time, container position and thus enable theaccurate determination of velocity and momentswhen container change movement direction. On atribometer base plate surface there is a connectionpanel for this transducer (8).Now will be described the most important partof the tribometer, the contact zone where tests areperformed (figure 2).1475Value of normal load in the contact zone isdefined by calibrated weights (1) where the forcestransferred through the shaft (2) with a sphericalend are to the pin bracket (3). Compensation ofown mass elements which are located on the pinbracket is performed through a spring with athreaded spindle (4). On pin bracket (3) set thesingle-axis piezoelectric vibration sensor (6) whichmeasures vibrations in the tribological contact inthe vertical direction.The close-up view of the above describedcontact zone is shown in figure 3.Figure 3. Close up view of contact zoneThere is a plate attached at the bottom ofaluminium container. Pin has cone top that fits intoa spherical end of the dynamometer bar and thuscarries the normal force evenly over the entiresurface of contact. Container has a volume of 500ml and is filled oil up with oil to about 1/3 of itsheight. Container is covered with a transparentcover on which there are connections for oilcirculation - suction and return. Suction line takesoil from the bottom of container on one side andreturns oil back to the surface on the other side ofcontainer. This is to ensure adequate oil mixingduring circulation.And, at the end the third part of the tribometer ispneumatic system (figure 4).147332Figure 2. System for setting load and forcemeasurementFigure 4. Pneumatic drive unit382 13 th International Conference on Tribology – Serbiatrib’13