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 machines, which working equipment is equipped with hydraulic drive. Essence of invention consists in the fact that hydraulic drive protection system comprises hydraulic tank, pump, drain line into hydraulic tank and shutoff device, comprising housing with outlet and outlet cavities, inlet, outlet and drain unions with channels, plunger with radial holes, groove and axial channel and stop. In thrust cavity between its butt end and threaded cover safety pressure plate and resilient element made in form of toroid designed to absorb energy of hydraulic impact are arranged. On safety pressure plate along its outer contour are fixed freely movable in through holes made along perimeter of end of stop, pushers designed to retain plunger in initial position and, after actuation of locking device, under action of toroid force, additionally ensuring return of plunger into initial position. Height of toroid is equal to sum of full stroke t of plunger and residual deformation f of toroid, and axial channel of plunger provides displacement through inlet cavity of locking device and drain hydraulic line into hydraulic tank of closed incompressible volume of working fluid formed between stop and plunger at end of its stroke.

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

1 cl, 3 dwg