Abstract: Gearbox with hydrostatic motors particularly for earth-movers, including a first hydrostatic motor and a second hydrostatic motor, each of which is connected respectively to a first countershaft and to a second countershaft by virtue of respective first and second transmission elements. The first countershaft and the second countershaft respectively support a plurality of input gearwheels which can be selectively coupled to a respective countershaft by virtue of selection elements. The input gearwheels mesh with respective secondary gearwheels so as to define gear ratios. The secondary gearwheels are supported by a secondary shaft to which they can be selectively coupled by virtue of the selection elements. A first output gearwheel is keyed on the secondary shaft and meshes with a second output gearwheel which is keyed on an output shaft.

Abstract: The present invention relates to a three-shaft gearbox particularly for industrial vehicles in general, which comprises an input shaft which is associable with a power unit and selectively interacts with a first countershaft or with a second countershaft. The first countershaft rigidly rotationally supports odd-numbered speed gears, whereas the second countershaft rigidly rotationally supports even-numbered speed gears. The first countershaft and the second countershaft are mutually disconnected. The even-numbered speed gears and the odd-numbered speed gears mesh with respective output gears, which are supported by an output shaft and can be selectively rigidly rotationally associated with the output shaft.

Abstract: Reduction-distribution unit for gearshift units, particularly for industrial machines, including a first hydrostatic motor and a second hydrostatic motor which are operatively associated for the transmission of the motion to the axles. The unit also comprises an epicyclic train which adds the power of the hydrostatic motors, the first motor being associated with the shaft of the sun gear and the second motor being associated with the shaft of the crown gear of the epicyclic train. A first brake and a second brake are respectively associated to the shaft of the sun gear and to the shaft of the crown gear.

Abstract: An automatic control device for the gearshift of industrial vehicles, in particular of the type suitable for automatically controlling a two-speed gearshift with engagement under torque actuated by a hydraulic motor. In order to avoid undesirable rapid decelerations of the vehicle while shifting from the second to the first gear, an element for delaying the engagement of the related gear is inserted between the electronic control system, generating the activation pulses for the solenoids which actuate the engagement of the clutches related to the two gears, and at least the control solenoid of the first gear. The delay is preferably preset according to the characteristics of the vehicle and of the gearshift.