WHEELED-VEHICLE MULTICIRCUIT HYDROSTATIC TRANSMISSION Russian patent published in 2007 - IPC B60K17/356 

FIELD: transport engineering.

SUBSTANCE: proposed hydrostatic transmission contains pumping station consisting of high-pressure pumps and make-up pumps, variable-capacity hydraulic motors to drive vehicle wheels coupled with high-pressure pumps by main hydraulic lines forming circulating hydraulic circuits, force-controlled valves for communicating hydraulic circuits of vehicle extreme wheel drive with hydraulic circuit of middle wheel drive. Bypass hydraulic lines are connected in each hydraulic circuit with main hydraulic lines. Bypass lines are provided with relief valves. Space of relief valves before shutoff member communicates with one of main hydraulic lines, and space behind shutoff member communicates through restrictor with the same main hydraulic line, and through check valve, with drain hydraulic line. Pilot valve is arranged in drain line is controlled by electric device connected with power source by electric circuit in which switching element of relay is arranged which is connected with electric control circuit of pneumatic valve communicating parking brake cut-in pneumatic chambers with source of compressed air and to which electric devices for changing working volume of hydraulic motors of all hydraulic circuits are connected through diode.

EFFECT: improved safety of operation of wheeled vehicle hydrostatic transmission.

5 cl, 2 dwg