Patent ID: 7766626
Filing Date: 2010-08-03
Classification: B60T,F04B

Abstract:
1. In a multipiston pump, having a pump housing, a motor, and an eccentric unit driven by the motor, having an arrangement comprising a plurality of piston pumps, which are combined hydraulically by means of connecting conduits in the pump housing into first and second pump units to supply two hydraulically separate hydraulic circuits with pressure fluid, the low-pressure sides of the piston pumps in the first pump unit being connected hydraulically to one another by a first low-pressure conduit and the high-pressure sides of the piston pumps in the first pump unit being connected hydraulically to one another by a first high-pressure conduit, the low-pressure sides of the piston pumps in the second pump unit being connected hydraulically to one another by a second low-pressure conduit and the high-pressure sides of the piston pumps in the second pump unit being connected hydraulically to one another by a second high-pressure conduit, and the eccentric unit and the arrangement of piston pumps being adapted structurally to one another in the pump housing such that the piston pumps of one pump unit are always actuated in alternation with the piston pumps of the second pump unit with a phase offset between the actuation of the piston pumps of one pump unit on the one hand and the actuation of the two pump units on the other hand, so that the intake phases of at least two piston pumps overlap, without the piston pumps being in phase opposition to one another, the improvement wherein the eccentric unit comprises at least two axially spaced apart cams, wherein the piston pumps are located in a number of sectional planes of the pump housing that correspond to the number of cams with the axial spacing of the cams being essentially equivalent to the axial spacing of these sectional planes; wherein the connecting conduits of the pump units are located in a region of the pump housing defined by the sectional planes, and wherein at least one of the piston pumps, combined hydraulically into a pump unit, is actuated by a different cam from the respective other piston pumps of the corresponding pump unit.