HYDRAULIC CONTROL SYSTEM OF THE GEAR COUPLING OF THE TRANSMISSION OF A VEHICLE Russian patent published in 2021 - IPC F16D48/06 F16H61/68 F15B15/02 

FIELD: vehicles.

SUBSTANCE: invention relates to automatic gearboxes. The hydraulic control system of toothed clutch comprises a hydraulic cylinder, placed in the body whereof is a piston with a rod. A gear coupling moving fork is fixed on the rod. The system comprises two-position electromagnetic valves controlled by an electronic unit, a three-position hydraulic distributor, a two-position additional valve. The working input of the additional valve upon deactivation communicates with the output of the electromagnetic valve, and upon activation of the valve, the working input thereof communicates with the pumping main. The working output of the additional valve communicates with the cavity of the hydraulic cylinder. An annular groove is made on the piston rod, and made in the body of the hydraulic cylinder opposite the rod are an inlet communicating with the distributor through a valve with the "OR" function and an outlet located opposite the inlet. The additional valve has two control inputs, wherein one of said inputs communicates with the distributor through the valve with the "OR" function, and the other communicates with the outlet in the body of the hydraulic cylinder.

EFFECT: reliability of control of the gear coupling of the transmission when the vehicle is moving in the emergency mode is increased.

1 cl, 6 dwg