US 6,361,282 B1Granted

Dual pump unit

AssigneeBrueninghaus Hydromatik GmbH

InventorGünter Wanschura

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Abstract

A dual pump unit comprising two hydraulic pumps (2,3) with coaxially mounted drive shafts (4,5) that are coupled to each other in a non-positive fit by means of a coupling member (28). The coupling member (28) surrounds a connecting member (15), wherein high pressure lines (29,30) and low pressure lines (31,32) are formed. The connecting member (15) extends between two control bodies (33) that are respectively associated with one hydraulic pump (2,3) and which are used to create a cyclic connection between the cylinders (18,19) of the hydraulic pumps (2,3) and the high pressure lines (29,30) and low pressure lines (31,32). The connecting member (15) consists of two connector plates (13,14) defining one of the hydraulic pumps (2,3) respectively on the control bodies (33,43) and an individually formed interchangeable intermediate element (38) arranged between the connector plates (13,14). The connector plates (13,14) each have a recess (34,35) into which the intermediate element (38) can be respectively inserted so that the connector plates (13) can radially encompass the intermediate element (38) and the intermediate element (38) can be fixed between the connector plates (13,14).

Claims9

Dependent claims

Dual pump (1) with

two hydraulic pumps (2, 3), the hydraulic pumps (2, 3) having cylinders (18, 19) for cyclical operation of the hydraulic pumps (2, 3), the hydraulic pumps (2, 3) having coaxially disposed drive shafts (4, 5), the coaxially disposed drive shafts (4, 5) being non-positively coupled together by means of a coupling piece (28), and
a connecting piece (15) surrounding the coupling piece (28), such that high-pressure lines (29, 20) and low-pressure lines (31, 32) are formed in the connecting piece (15), the connecting piece (15) extending between two control bodies (33, 43) each associated with one of the hydraulic pumps (2, 3) and serving to cyclically connect the cylinders ( 18, 19) of the hydraulic pumps (2, 3) to the high-pressure lines (29, 30) and the low-pressure lines (31, 32), characterised in
that the connecting piece (15) comprises two connection plates (13, 14), each connecting plate (13, 14) adjoining the control body (33, 43) associated with one of the hydraulic pumps (2, 3), and an intermediate element (38), which is disposed between the connection plates (13, 14), is interchangeable and configurable such that the connection plates (13, 14) each comprise a recess (34, 35) in which the intermediate element (38) is at least partly inserted such that the connection plates (13, 14) at least partly encompass the intermediate element (38) radially and the intermediate element (38) is fixed between the connection plates (13, 14).

Dependencies are inferred from the claim text.

Facts

Application: 09/554,647Filed 17 May 2000
Priority: DE 198 28 10824 Jun 1998
Granted: 26 Mar 2002
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F04C 11/006
Of dissimilar working principle: having complementary function
F04B 1/22
Having rotary cylinder block: having two or more sets of cylinders or pistons
F04B 23/06
Combinations of two or more pumps: the pumps being all of reciprocating positive-displacement type
F04C 2/102
Of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member: the two members rotating…