# US 9,039,539 B2 · Arrangement for transmitting a torque between a shaft and a hub > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,539 B2 - Document ID: US9039539B2 - Status: Granted - Kind: B2 - Application number: 13/881,691 - Filed: 2011-08-30 - Published: 2013-10-24 - Granted: 2015-05-26 - Earliest claimed: 2010-10-29 - Assignees: Robert Bosch GmbH - Applicants: Siamend Flo; Frank Nitsche; Juergen Arnold - Inventors: Siamend Flo; Frank Nitsche; Juergen Arnold - Web page: https://patentgrep.com/patent/US9039539B2 ## CPC - F16D 3/185: {radial teeth connecting concentric inner and outer coupling parts} - F02M 37/041: {Arrangements for driving gear-type pumps} - F04C 2/102: {the two members rotating simultaneously around their respective axes} - F04C 15/0073: {Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft} - F16D 3/221: the rolling members being located in sockets in one of the coupling parts - F04C 14/26: using bypass channels - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS ## Abstract An arrangement transmits a torque between a shaft and a hub. The hub has at least approximately the interior geometry of an equilateral n-sided polygon, the side surfaces of which at least approximately bear against a clutch portion, which is of circular overall cross section, of the shaft, and wherein the shaft has at least one driver portion which is rotationally conjoint with respect to the clutch portion and which extends in the direction of a corner of the n-sided polygon. ## Claims ### Claim 1 A torque transmission arrangement comprising: a hub defining at least approximately an interior geometry of an equilateral n-sided polygon having side surfaces; a shaft including (i) a coupling portion defining a circular overall cross section, (ii) at least one driver portion rotationally fixed relative to the coupling portion and extending in a direction of one corner of the n-sided polygon, and (iii) a driver element accommodated in an aperture in the coupling portion of the shaft, wherein the side surfaces of the n-sided polygon at least approximately bear against the coupling portion of the shaft; wherein the arrangement is configured to transmit a torque between the shaft and the hub; and wherein the at least one driver portion has a shape of a spherical cap and is defined on the driver element. ### Claim 2 (depends on 1) The torque transmission arrangement as claimed in claim 1, wherein the driver element is pressed into the aperture. ### Claim 3 (depends on 1) The torque transmission arrangement as claimed in claim 1, wherein the driver element includes a ball. ### Claim 4 (depends on 3) The torque transmission arrangement as claimed in claim 3, wherein the aperture includes a blind hole having dimensions such that approximately one third of a diameter of the ball extends from the coupling portion. ### Claim 5 (depends on 1) The torque transmission arrangement as claimed in claim 1, wherein the shaft includes at least one driver portion for each corner of the n-sided polygon. ### Claim 6 (depends on 1) The torque transmission arrangement as claimed in claim 1, wherein the coupling portion includes an encircling raised portion defined by an annular bead. ### Claim 7 (depends on 6) The torque transmission arrangement as claimed in claim 6, wherein the annular bead has a cross-sectional contour at least approximately in the form of a circular segment. ### Claim 8 (depends on 7) The torque transmission arrangement as claimed in claim 7, wherein: the shaft has a cylindrical shape, and the annular bead is defined by a spherical contour passing through the shaft. ### Claim 9 A gear-type fuel pump, comprising: a shaft; and a gearwheel having a hub, wherein the gearwheel is connected to the shaft by a torque transmission arrangement configured to transmit a torque between the shaft and the hub, wherein the hub defines at least approximately an interior geometry of an equilateral n-sided polygon having side surfaces, wherein the shaft includes (i) a coupling portion defining a circular overall cross section, (ii) at least one driver portion rotationally fixed relative to the coupling portion and extending in a direction of one corner of the n-sided polygon, and (iii) a driver element accommodated in an aperture in the coupling portion of the shaft, wherein the side surfaces of the n-sided polygon at least approximately bear against the coupling portion of the shaft, and wherein the at least one driver portion has a shape of a spherical cap and is defined on a driver element. ### Claim 10 (depends on 9) The gear-type fuel pump of claim 9, wherein the driver element is pressed into the aperture. ### Claim 11 (depends on 9) The gear-type fuel pump of claim 9, wherein the driver element includes a ball. ### Claim 12 (depends on 11) The gear-type fuel pump of claim 11, wherein the aperture includes a blind hole having dimensions such that approximately one third of a diameter of the ball extends from the coupling portion. ### Claim 13 (depends on 9) The gear-type fuel pump of claim 9, wherein the shaft includes at least one driver portion for each corner of the n-sided polygon. ### Claim 14 (depends on 9) The gear-type fuel pump of claim 9, wherein the coupling portion includes an encircling raised portion defined by an annular bead. ### Claim 15 (depends on 14) The gear-type fuel pump of claim 14, wherein the annular bead has a cross-sectional contour at least approximately in the form of a circular segment. ### Claim 16 (depends on 9) The gear-type fuel pump of claim 9, wherein: the shaft has a cylindrical shape, and the annular bead is defined by a spherical contour passing through the shaft.