# US 9,751,512 B2 · Internal gear pump > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,512 B2 - Document ID: US9751512B2 - Status: Granted - Kind: B2 - Application number: 14/771,167 - Filed: 2014-01-27 - Published: 2016-01-14 - Granted: 2017-09-05 - Earliest claimed: 2013-03-11 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Harald Speer; Rene Schepp; Edgar Kurz; Norbert Alaze - Web page: https://patentgrep.com/patent/US9751512B2 ## CPC - B60T 13/16: using pumps directly, i.e. without interposition of accumulators or reservoirs - F04C 2/086: {Carter} - F04C 2/102: {the two members rotating simultaneously around their respective axes} - F04C 2/14: with toothed rotary pistons - F04C 15/0007: {Radial sealings for working fluid} - F04C 15/0026: {Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps} - F04C 15/0076: {Fixing rotors on shafts, e.g. by clamping together hub and shaft} - F04C 2240/30: Casings or housings - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract The disclosure relates to an internal gear pump as a hydraulic pump for a slip-controlled vehicle brake system. The disclosure proposes to configure the internal gear pump as a preassembled module with a cartridge as housing, which can be pressed into a receptacle of a hydraulic block of the vehicle brake system. The cartridge has two steps which are parallel to one another for attaching a press-in ram and for orienting the cartridge in an angularly correct manner by means of the press-in ram, and a sealing surface, with which the cartridge bears in a sealed manner in the receptacle of the hydraulic block when the cartridge is pressed into the receptacle. ## Claims ### Claim 1 An internal gear pump for a hydraulic vehicle brake system, comprising: a cartridge in which gears of the internal gear pump are housed, the cartridge formed as a preassembled module and including a shoulder configured for angular alignment of the cartridge during installation of the cartridge; and a drive wheel positioned on one end of the cartridge, a diameter of the drive wheel being smaller than a diameter of the cartridge, wherein the drive wheel does not overlap the shoulder when viewed axially. ### Claim 2 (depends on 1) The internal gear pump as claimed in claim 1, further comprising a pump shaft that is eccentric with respect to the cartridge. ### Claim 3 (depends on 1) The internal gear pump as claimed in claim 1, the cartridge having an encircling sealing surface on an outer circumference of the cartridge, the encircling sealing surface configured to seal the cartridge in a socket. ### Claim 4 (depends on 3) The internal gear pump as claimed in claim 3, wherein the sealing surface is narrow. ### Claim 5 (depends on 1) The internal gear pump as claimed in claim 1, wherein the cartridge has a circular cross section. ### Claim 6 (depends on 1) The internal gear pump as claimed in claim 1, wherein the cartridge includes two parallel surfaces extending in secant directions so as to form the shoulder. ### Claim 7 (depends on 6) The internal gear pump as claimed in claim 6, wherein: the two parallel surfaces are formed as part of two mutually opposite parallel steps which are parallel with respect to a longitudinal axis of the cartridge, and each of the two mutually opposite parallel steps further includes a radial surface situated in a radial plane of the cartridge defined perpendicular to the longitudinal axis and which are configured for pressing the cartridge into a socket. ### Claim 8 An internal gear pump for a hydraulic vehicle brake system, comprising: a cartridge in which gears of the internal gear pump are housed, the cartridge formed as a preassembled module and including a shoulder configured for angular alignment of the cartridge during installation of the cartridge, wherein the cartridge includes two parallel surfaces extending in secant directions so as to form the shoulder. ### Claim 9 (depends on 8) The internal gear pump as claimed in claim 8, wherein: the two parallel surfaces are formed as part of two mutually opposite parallel steps which are parallel with respect to a longitudinal axis of the cartridge, and each of the two mutually opposite parallel steps further includes a radial surface situated in a radial plane of the cartridge defined perpendicular to the longitudinal axis and which are configured for pressing the cartridge into a socket. ### Claim 10 (depends on 8) The internal gear pump as claimed in claim 8, further comprising a pump shaft that is eccentric with respect to the cartridge. ### Claim 11 (depends on 8) The internal gear pump as claimed in claim 8, the cartridge having an encircling sealing surface on an outer circumference of the cartridge, the encircling sealing surface configured to seal the cartridge in a socket.