SCREW HYDRAULIC PUMP Russian patent published in 2011 - IPC F04D13/12 F04D3/02 

FIELD: engines and pumps.

SUBSTANCE: screw hydraulic pump includes housing 1, front and rear covers 3, 14, shaft 5, inlet branch pipe 17 and outlet branch pipe. On inner end surface of front cover 3 there radially provided are cylinders 6 located at equal distance from each other and are continued part of the above cover; the above cylinders are covered on the side of shaft 5 rotation axis and have one central hole in closed side. Inner cavity of each of cylinders 6 is hydraulically connected to inlet and outlet cavities 16, 12. Screw in the form of shaft with spiral comb is inserted inside each cylinder 6. One end of shaft is passed into the hole of covered side of cylinder 6 and driven gear 9 is fixed on it and is engaged with driving gear 10 of shaft 5 of hydraulic pump. The other end of screw is inserted in bearing of cover of cylinder 6, which has liquid passage holes to outlet cavity 12. Inlet cavity 16 is connected to inner cavity of cylinder 6 by means of opening 15 located on housing of cylinder 6 closer to rotation axis of shaft 5 of hydraulic pump.

EFFECT: improving technical characteristics of hydraulic pump.

6 dwg