HYDRAULISCHE SCHALTANORDNUNG FUER EIN FAHRZEUG MIT EINEM HYDROSTATISCHEN GETRIEBE

摘要

A hydraulic arrangement for a vehicle comprises a hydrostatic transmission and an additional pump (7) for the power hydraulics of the consumers 15a, 15b, 16, 17 of a fork lift truck switch arrangement, using switching elements, facilitates the braking of the vehicle which includes the hydrostatic drive by additionally exploiting the drag effort available from the pump (7). For this purpose a delivered flow measuring valve (10) is incorporated in the feed pressure line (9) of the pump (7), which measuring valve (10) measures the speed of a drive engine (1) and above a specific speed connects the feed pressure line (9) to the load pressure line of a directional control valve block (11) of the power hydraulics. As a result the input pressure balance device (28) of a directional control valve unit (11) is brought into a blocked position and the delivered flow of the pump is obstructed, which leads to a braking effect. The valve (10) (Fig 2) may communicate with spring- loaded brakes for the shafts of the motors of the transmission. The valve (10) may communicate with an alternative control surface of the device (28) (Fig. 3). <IMAGE>