HYDROSTATIC DRIVING DEVICE PARTICULARLY FOR MIXER DRUMS OF CONCRETE-MIXER TRUCKS

摘要

A transmission case containing a sunk hydromotor (1) and an annular chamber (4) traversed under pressure by a liquid has the double function of being both an oil cooler and a collector for the outer pumps (24). The working fluid coming out of the hydraulic motor (1) and the rinsing oil are merged together in a conduit which meanders about intermediate ribs (27, 28) to open in a supply conduit (22) for the pumps. The intermediate ribs (22) are connected or are in one piece with the transmission case (5), which is provided with a plurality of outer ribs and which may be optionally exposed to a cooling air stream. The annular chamber (4) is separated by means of plates (29, 30) from eventual driving members; openings (40) provide for the communication between said annular chamber and the oil case (41).