DEVICE FOR CONTROL OF TRANSMISSION Russian patent published in 2011 - IPC F16H59/02 F15B15/02 

FIELD: machine building.

SUBSTANCE: device for control of transmission consists of two-step planetary gear and step reducer switched hydraulically by means of friction clutches, electromagnetic valves and electric selector of steps. A pressure line connects valves of the reducer steps with a pressure source. An additional pressure line connects valves of the two-step planetary gear with a pressure source via a back valve with a correcting valve. Each pressure line is equipped with an individual accumulator of pressure and a nozzle connected with the pressure source. A sensor of electric signals switches over the correcting valve turning pressure lines off from the pressure source at each step switching. New steps are turned on in the two-step planetary gear and reducer synchronously with use of pressure accumulators and nozzles of the pressure lines. Simultaneously pressure in cylinders of turned off friction clutches is dropped synchronously through the correcting valve, which facilitates process of switching without break of power flow.

EFFECT: steps switching without break of power flow.

6 cl, 9 dwg