AXIAL-PISTON SELF-PRIMING VARIABLE-CAPACITY PUMP Russian patent published in 1999 - IPC

FIELD: mechanical engineering; positive displacement hydraulic drives of various application machines. SUBSTANCE: pump is adjusted by rocking cylinder block 4 by means of regulator including step piston 8 loaded by spring 7 whose effort is directed to side of turning of cylinder block 4 to zone of pump maximum capacity. Regulator chamber 9 communicates constantly with pump delivery hydraulic line 11, and regulator chamber 10 is installed for periodical connection in process of regulation either to tank 12 or to pump delivery hydraulic line 11 by means of pressure control made in form of throttling hydraulic distributor 14 loaded by spring 13. Invention provides for use of piston 16 installed coaxially with spring 13 for engagement with spring end face which simplifies design of pump and facilitates its control. Pressure control load spring 13 is provided with adjustable stop which makes it possible to limit upper limit of pressure built by pump without use of special safety valve. EFFECT: enhanced reliability of operation. 1 dwg