Patent ID: 9494167
Filing Date: 2016-11-15
CPC Classification: B62D,E02F,F15B

Claim Text:
1. Hydraulic apparatus comprising: at least a pumping device for pumping a fluid at a first pressure; at least a user device of said fluid at said first pressure; where said user device is of the type of a hydrostatic power steering; and a line between said hydrostatic power steering and said pumping device; said line is for measuring pressures and for transmitting to the pumping device pressure value variations which occur inside the hydrostatic power steering when said hydrostatic power steering is operated by a driver when said driver has to turn a steering wheel; at least an emergency supply device connectable to said user device activating a connection by movement of a cursor element of a distributor device in a sliding seat; at least an activation device of said connection that can be operated at a second pressure of said fluid different from said first pressure and said activation device is interposed between said user device and said emergency supply device, and between said pumping device and said emergency supply device; wherein said activation device comprises at least said distributor device for distributing said fluid, wherein said distributor device comprises the cursor element defining two opposite ends and sliding into a distributor body having a plurality of distribution ports, said cursor element being activated sliding by pressure values of said fluid acting on said opposite ends, and wherein said distributor body defines inside the sliding seat and said plurality of ports cross said distributor body, in such a way to put said sliding seat in communication with the outside of said distributor body, said cursor element adjusting by means of sliding in said sliding seat, openings and closings of said plurality of ports; and wherein said activation device has an emergency configuration wherein both said pumping device and said emergency supply device are connected to said user device, a protection configuration where both said pumping device and said emergency supply device are disconnected from said user device, and a normal operating configuration wherein said pumping device is connected with said user device and said emergency supply device is disconnected from said user device; wherein the emergency supply device comprises at least one accumulator unit for the pressurized fluid, and wherein the sliding seat has an end closed with at least a cap and an opposite end by which is applied at least an elastic counter arrangement to counteract the sliding of said cursor element, wherein the elastic arrangement comprises at least two springs that can be preloaded at pressure values that are different from one another, comprising a first spring and a second spring, wherein in the emergency configuration the first spring is inactive with respect to the opposite end and wherein in the protection configuration both of the springs are compressed in an axial direction.