TROLLEYBUS STEERING HYDRAULIC SYSTEM Russian patent published in 2000 - IPC

FIELD: transport engineering; city and interurban trolleybuses. SUBSTANCE: system has pumping station 1 with constant capacity pump 2 and hydraulic tank 4. Pumping station is connected with steering hydraulic booster 5, with hydraulic cylinder 6 through nonreturn valve 7. It has also distributor 8, pressure converter consisting of delivering and receiving hydraulic cylinders 10 and 13, control distributor 11 and pilot- controlled check valve 12 which is connected to output of pump 2 through nonreturn valve 7, control input of pilot-controlled check valve being connected to output of distributor 11. System includes also charging and discharging subsystem of hydraulic accumulator 14 consisting of flow governor 15 and nonreturn valve 16. Working liquid delivered into piston space of hydraulic cylinder 10 sets piston of hydraulic cylinder 13 into motion, thus providing constant volume of working liquid in system and forcing out working liquid from space of hydraulic cylinder 10 into charging and discharging subsystem of hydraulic accumulator 14. When required charging pressure is reached, pressure relay 18 operates accompanied by deenergizing of electromagnet 9. EFFECT: enhanced reliability and safety of trolleybus. 1 dwg