Patent ID: 7331775
Filing Date: 2008-02-19
Classification: F04C

Abstract:
1. A hydraulic pump with a pressure chamber and a suction chamber, the hydraulic pump comprising: at least one displacement body, which is connected to be driven between the pressure chamber and the suction chamber, so that a hydraulic medium is pumped from the suction chamber into the pressure chamber, and from the pressure chamber, which is sealed off so as to be essentially pressure-tight from the suction chamber; a hydraulic-medium-conducting backflow connection with a predefined flow cross section relative to the suction chamber, wherein the hydraulic pump is an internally toothed pump which has an externally toothed pinion and an internally toothed internal gear, and wherein the externally toothed pinion is arranged off-center in the internally toothed internal gear and is in meshing engagement therewith; and a filler being in a sickle-shaped space between the externally toothed pinion and the internally toothed internal gear, whereby the hydraulic-medium conducting backflow connection is inserted into the filler, so that it extends from the pressure chamber up to the suction chamber.