摘要:
A variable-ratio transmission comprises a differential kinematic mechanism (10; 30) including at least two drive inputs (13) and one drive output (3) and a speed variator (4, 6a, 6b; 204, 206a, 206b) associated with at least one of the two drive inputs (13).
摘要:
A fluid-dynamic jack (4) unit and corresponding support (5) , especially for the control of steering in steering axles, in which the jack (4) is secured to the support (5) by fixing means which comprise at least one recess (14, 18) and key (19) coupling between the jack (4) and support (5) to axially secure the jack (4) on the support (5) and at least one stirrup (20) between the jack (4) and support (5) to keep the recess (14, 18) and key (19) of the coupling mutually engaged is described.
摘要:
A control system for a variable-ratio transmission (1) of the type in which the variation is controlled by displacing two elements of the transmission relative to one another along a displacement axis, and in which these elements can give rise to a thrust having a component along the displacement axis, which component is correlated with the torque transmitted by the transmission, is described. The system includes operative control means interposed between actuator means and at least one of the two transmission elements in order to instigate the displacement upon the operation of the actuator means; resilient means (106a, 106b) are also interposed between the operative control means and the actuator means and can yield resiliently as a result of the thrust component along the displacement axis when the said component exceeds a predetermined threshold value corresponding to a value of the maximum torque transmitted by the transmission.
摘要:
In a braking unit of the SAHR type comprising a braking pack (15) with disks (16a, b) and counter-disks (17a, b, c), a resilient system (47a, b) for compressing the pack with a braking load sufficient for parking braking, a first hydraulic system for exerting on the resilient system a contrary load sufficient to cancel out its effect, a second hydraulic system acting on the pack to compress it with a braking load sufficient for service braking, both hydraulic systems share a single piston (40) acting on one side on the pack (15) and on the other side on the resilient system (47a, b).
摘要:
A hydraulic circuit for lifting and floating a tool supported by a tractor for agricultural uses, comprising at least means (2, 3) adapted to pressurize the fluid contained in the hydraulic circuit, two actuators (8, 9) actuated by the pressurized fluid and adapted to lift/float the tool, and means (4) which are adapted to control the flow of the pressurized fluid into the hydraulic circuit, characterized in that it further comprises a pair of reservoirs (10, 11) for the pressurized fluid, means (6) which are adapted to produce a preset value of the pressure of the fluid inside the hydraulic circuit, and means (5) which are adapted to automatically restore to the preset value the pressure of the fluid inside the hydraulic circuit.
摘要:
A mechanical-hydrostatic transmission (10), particularly for tools and vehicles suitable for gardening, such as lawn-mowers or the like, comprising a reduction unit (13), a clutch unit (14), an oil pump (15) and a hydraulic motor (16) which are integrated and contained within a single casing (12), the pump and the clutch unit being arranged coaxially on a first shaft (17) which is connected externally, by means of a coupling, to motor means, the pump being hydraulically connected to the hydraulic motor and the hydraulic motor being in turn axially associated with a second shaft (20) from which a power take-off extends. The casing (12) contains kinematic connections (23) for transmitting motion to the driving wheels.