Patent ID: 8220380
Filing Date: 2012-07-17
Classification: F04B

Abstract:
1. A hydraulic unit comprising an oil-containing reservoir ( 28 ) including a motor ( 15 ) and a multiple piston pump ( 60 ) driven by said motor, said multiple piston pump ( 60 ) having a plurality of individual pumps ( 61 ) evenly spaced around a motor shift axis in a star-shaped array, wherein said reservoir ( 28 ) has connected therewith an at least partly oil-filled auxiliary reservoir ( 47 ) for refilling said reservoir after withdrawal of oil by said multiple piston pump, thus ensuring a complete submersion of said multiple piston pump ( 60 ), said oil defining an oil level ( 65 ) within the auxiliary reservoir ( 47 ), the auxiliary reservoir ( 47 ) being hermetically sealed above the oil level ( 65 ), and below said oil level ( 65 ) a connecting line ( 48 ) connecting the auxiliary reservoir with a vented additional tank ( 45 ).