Abstract: A tensioning system of traction tracks of a machinery by means of a hydraulic cylinder applying a tensioning force on at least one of the wheels on which the track is wound according to a closed chain configuration in which the hydraulic cylinder is fed with different pressures according to the traction direction, in a first traction direction the feeding pressure of the tensioning hydraulic cylinder being a first pressure approximately corresponding to the pressure which is generated by a pump which is present on a closed circuit feeding the traction devices, in a second traction direction the feeding pressure of the tensioning hydraulic cylinder being a second pressure corresponding to the pressure of the closed circuit up to a predetermined upper limit value.

Abstract: Self-propelled road milling machine with a milling drum housing including a side with a power take-off to transmit rotational motion to a milling drum mounted in an axially sliding way and replaceable from the side opposite the side of the power take-off. The milling drum is rotated by a reduction gear. The reduction gear is mounted at the end of a hollow spacer. A transmission shaft is present in the hollow spacer. The hollow spacer connects the wall of the housing on the side of the power take-off to a support flange of the reduction gear, which is connected to a spacer. The spacer engages a movable flange of the reduction gear, and connects to fastening elements and the support on the wall of the housing. The support flange and the hollow spacer are static with respect to the rotary movement of the milling drum.

Abstract: A self propelled road milling machine including: a chassis mobile on crawler-tracks; a milling drum supported by the chassis and located inside a drum housing; at least first and second conveying devices, supported by the machine chassis, receiving the material milled by the milling drum, and transporting it to a discharge point; a suction-filtering device of the air polluted by dust and vapors produced by the milling process; upper and side sealing mechanisms on the conveying devices, the sealing mechanisms being able to realize one continuous chamber above the conveying devices; suction device connected to the continuous chamber able to realize a maintained depression relative to the outside, the suction device being conceived for sucking the polluted air from the continuous chamber; a filtering unit to filter the polluted air, consisting of a battery of filtering elements, interposed between the continuous chamber and the suction device.