Tribological test apparatus

A tribological test apparatus (1) comprising:

• a supporting structure (2);
• a central shaft (21) extending along a first axis (3), connected to said supporting structure (2) to rotate about said first axis (3), and supporting a central specimen (41);
• at least three peripheral shafts (52) extending along respective second axes (54) equally spaced about said first axis (3), connected to said supporting structure (2) so as each to rotate about the respective second axis (54), and supporting respective peripheral specimens (51) radially facing said central specimen (41);
• push means (80) for exerting on each said peripheral specimen (51) a force (F) directed towards said central specimen (41);
• and
• relatively mobile means (56) associated with said peripheral shafts (52) to enable each said peripheral specimen (51), in use, to move radially towards said central specimen (41) and exert a contact pressure on said central specimen (41) under the action of said force (F);
• characterized in that said push means (80) comprise, for each said peripheral specimen (51), a movable push member (81) for exerting said force (F) along a push axis (82) intersecting said first (3) and said second (54) axis.