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 motor, shutoff device consisting of housing 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 an output cavity on the other side. 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 is interconnected with body outlet cavity by means of axial channel of plunger, which at end of plunger stroke is covered by conical valve, having hydraulic support from hydraulic pump, with the possibility of its free movement in the through channel of the stop, and the outlet channel is simultaneously overlapped with the cylindrical surface of the plunger. Plunger and the valve are spring-loaded by elastic elements. Valve has a collar which is a spring thrust. Plunger additionally has a channel communicating the outlet cavity of the shut-off device with the drain hydraulic line, which is intended for draining into the hydraulic tank of the closed volume of the incompressible working fluid formed between the plunger and the stop at the end of its stroke.

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

1 cl, 3 dwg