Tightener for a belt drive operating in the presence of oil

A tightening (1), wherein with the oil condition matched with the belt, wherein: A first axis (A) pin (2); A disc (2) is integrally, and wherein the basically vertical base plate (15); Are connected by a rotating disc (2) and base plate (15) and a arm (3); A cam arm (3) bearing contact piece (5); And connected to a arm (3) is opposite to the belt drive contact piece (5) and elastic element (4). The tightening machine (1) further - comprising is made of oil resistant material and (3) axial supporting the cam arm Is Jiban (15) on the friction bodies (16); And the base plate (15) of the friction bodies (16) axial elastic device (24).