HYDRAULIC DRIVE PROTECTION SYSTEM Russian patent published in 2019 - IPC F15B20/00 

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for protection against unauthorized discharge of working fluid from hydraulic systems of road-building, agricultural, reclamation, forestry and industrial machines and hydraulic-driven working equipment of machines. Hydraulic drive protection system includes hydraulic tank, pump, pressure, drain hydraulic lines with inlet, outlet and drain unions and shutoff device installed in pressure hydraulic line and connected by its inlet cavity to pump outlet, and outlet – to distributor, including housing with located inside spring-loaded plunger with formation on one side of inlet, and on the other output cavity, having external annular groove, combined with radial holes, axial channel and additional hole, connecting inlet and outlet cavities, wherein the axial channel is covered by a spring-loaded tapered valve, and the additional opening serves to displace the closed incompressible volume of the working fluid formed at the end of the plunger stroke between the plunger and the stop, into the inlet cavity, support with through axial channel with possibility of free movement in it of valve and cavity with hermetically closed threaded cover with safety pressure plate located in cavity of support and resilient element made of elastic material shaped to toroid filled with inert gas, note here that said resilient element allows absorbing energy of hydraulic impact occurring during actuation of locking device of hydraulic drive protection system.

EFFECT: improved operational reliability of the machine hydraulic drive protection system.

1 cl, 4 dwg