HYDRAULIC DRIVE PROTECTION SYSTEM Russian patent published in 2020 - 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 hydraulic line, drain line into hydraulic tank, hydraulic distributor, hydraulic actuator, shut-off device consists of case equipped with inlet, outlet, drain unions and stop. Inside the shut-off device housing there is a plunger with formation of an inlet cavity on one side, and on the other side – outlet cavity, and in the stop there is a through axial hole for free movement of the valve and a blind cavity interconnected by axial and radial channels with an outlet cavity, designed to displace closed incompressible volume of working fluid formed at the end of plunger stroke between plunger and thrust, into discharge cavity of pump. Along external surface of the plunger there is an annular groove and radial holes communicating, when the locking device is actuated, with the drain line into the hydraulic tank. Inlet cavity of the shut-off device communicates with the outlet cavity by means of the axial channel of the plunger, the seat of which is covered with an elastic cuff fixedly installed on the end of the cylindrical valve, having hydraulic support from the pump. Plunger and the valve are spring-loaded by elastic elements.

EFFECT: higher operational reliability of the hydraulic drive protection system.

1 cl, 4 dwg