Twin pump with a charging pump

Abstract

A double pump unit including two hydraulic pumps (1, 2) having drive shafts (5, 6) arranged coaxially with one another, which shafts are coupled with one another in a force-locking manner by a coupling piece (23). The coupling piece (23) is integrated in a connection piece (26) at least partially surrounding the coupling piece, in which connection piece there are formed suction channels (19, 20) for drawing in the pressure medium to be delivered through the hydraulic pumps (1, 2). The connection piece (26) has an inlet pressure chamber (33) into which the suction channels (19, 20) open. Further, the coupling piece (23) has peripherally arranged blade elements (30, 31) which rotate in the inlet pressure chamber (33) in order to feed the pressure medium into the suction channels (19, 20) under an initial pressure. The connection piece (26) may also be formed in two parts and, along with a main body (27), have a lid-like closure part (29) which is so dimensioned that the coupling piece (23), with its blade elements (30, 31), can be introduced into the main body (27) of the connection piece (26) through an opening (34) which can be closed by the closure piece (29).

Dependencies are inferred from the claim text.