HYDROSTATIC TRANSMISSION DEVICE OF A MOVEABLE DEVICE WITH AN EXCHANGE

摘要

The device comprises a main hydraulic pump (52), two main conduits (50,54), a supercharging pump (56), a first hydraulic motor (10,20) consisting of two elementary motors (11,12,21,22) used to drive a first displacement element (1,2) and a second hydraulic motor (30; 40) used to drive a second displacement element (3, 4). The Second elementary motor (12) is parallel to the second main motor (30), and the first elementary motor (11) and the second main motor (30) are joined to an additional supply or discharge conduit, by means of a serial connection, for example. The supercharging pump (56) is joined to the additional conduit, e.g. connecting conduit (60,62) between the first elementary motor (11; 21) and the second main motor (30; 40). An exchange valve (70) joins the main conduits to a reservoir without overpressure (51) and the device comprises means (72) for preventing said exchange connection when a condition revealing a slipping situation is detected.