HYDROELECTRIC DRIVE Russian patent published in 2014 - IPC F15B9/04 

FIELD: engines and pumps.

SUBSTANCE: hydroelectric drive comprises feed unit 1 with axial piston pump 2, hydraulic delivery and rain lines 3, 4 connected in parallel therewith and steering drives 5, 6, 7, 8, 9, 10, 11, 12 of discrete angular displacement. Every said steering drive 5, 6, 7, 8, 9, 10, 11, 12 includes hydroelectric booster and rotary hydraulic actuator. Said drive is furnished with starting booster connected to suction side of unit 1 and drain line 4 of drives 5-12 and composed of the vessel with air and fluid chambers 13, 14, 15 separated by stepped piston with two steps 16, 17 connected by rod 25. Said piston has larger diameter step 16 facing closed air chamber 13 communicated via safety valve 24 with drain line 4 and smaller diameter step 17 facing the fluid chamber 15 connected to hydraulic line 35. Note that air chamber 14 between steps 16, 17 is communicated with ambient space. Feed unit 1 is equipped with compensating pressurisation device composed of bellows 18 secured at pump housing 2 to make chamber 20 communicated with housing 19. Bellows 18 I secured to housing 19 and hollow piston 21 displacing over the surface of housing 19. Pressure limitation valve 24 allows discharging of working fluid into chamber 13. Rings 22, 23 of piston 21 have inner circular seals 27, 28 that displace over stepped surface of housing 19.

EFFECT: higher reliability and operating performances at reduced ambient pressure, simplified design, easier control over operating availability.

8 cl, 2 dwg