# US 12,180,957 B2 · System comprising an electric machine and a hydraulic unit, as well as electric machine and hydraulic unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,180,957 B2 - Document ID: US12180957B2 - Status: Granted - Kind: B2 - Application number: 18/462,491 - Filed: 2023-09-07 - Published: 2023-12-28 - Granted: 2024-12-31 - Earliest claimed: 2022-01-31 - Assignees: Parker-Hannifin Corporation; Parker Hannifin EMEA S.à.r.l. - Applicants: Parker-Hannifin Corporation; Parker Hannifin Emea S.à.R.L. - Inventors: Raimund Pelz; Maximilian Keil; Kyle J. Myers; David E. N. Mack; Fredrik Magnusson; Omer Khaleeq Kayani - Web page: https://patentgrep.com/patent/US12180957B2 ## CPC - 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} - F04D 13/06: the pump being electrically driven - F04D 29/044: Arrangements for joining or assembling shafts - F04D 29/061: {especially adapted for liquid pumps} - F04D 29/106: {especially adapted for liquid pumps} - F16D 1/101: {without axial retaining means rotating with the coupling} - F04D 13/0646: {the hollow pump or motor shaft being the conduit for the working fluid} - F16D 2001/103: {the torque is transmitted via splined connections} - F16D 2300/06: Lubrication details not provided for in group F16D13/74 - H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)} - F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A system includes an electric machine and a hydraulic unit. The electric machine includes a first shaft. The hydraulic unit includes a second shaft and a leakage oil chamber. The first shaft and the second shaft are connected to one another to form the shaft-hub connection. The shaft-hub connection has a central recess and is connected fluidically to the interior of the hydraulic unit for lubrication. The central recess adjoins at least one transverse channel. The at least one transverse channel extends from the central recess to an external circumference of the shaft-hub connection. ## Claims ### Claim 1 A system comprising an electric machine, wherein the electric machine comprises a first shaft, and a hydraulic unit, wherein the hydraulic unit comprises a second shaft, wherein the first shaft and the second shaft are connected to one another to form a shaft-hub connection,. the shaft-hub connection comprises a central recess the shaft-hub connection is fluidically connected to an interior of the hydraulic unit for lubrication and the hydraulic unit comprises a leakage oil chamber wherein the central recess adjoins at least one transverse channel, wherein the at least one transverse channel extends from the central recess to an external circumference of the shaft-hub connection, wherein fluid located in the at least one transverse channel is subjected to a centrifugal force during operation of the system, whereby fluid is conveyed from the central recess into the leakage oil chamber surrounding the external circumference of the shaft, wherein fluid is sucked in as a result of the negative pressure formed thereby in the recess, so that a specific conveying direction of the fluid is predefined. ### Claim 2 (depends on 1) The system according to claim 1, wherein the first shaft and the second shaft are inserted into one another to form the shaft-hub connection. ### Claim 3 (depends on 2) The system according to claim 2, wherein the first shaft and/or the second shaft comprises the central recess, wherein the at least one transverse channel extends from the central recess to an external circumference of the shaft-hub connection. ### Claim 4 (depends on 2) The system according to claim 2, wherein the central recess and the at least one transverse channel are disposed in the second shaft. ### Claim 5 (depends on 1) The system according to claim 1, wherein the shaft-hub connection comprises an intermediate shaft for connecting the first shaft and the second shaft, wherein the central recess and the at least one transverse channel are formed in the intermediate shaft. ### Claim 6 (depends on 1) The system according to claim 1, wherein the at least one transverse channel extends from the central recess to the leakage oil chamber. ### Claim 7 (depends on 6) The system according to claim 6, wherein the central recess extends as an axial channel from the at least one transverse channel through the second shaft to the shaft-hub connection. ### Claim 8 (depends on 5) The system according to claim 5, wherein the central recess extends as an axial channel from the at least one transverse channel through the second shaft or through the intermediate shaft to a front-side end of the second shaft or of the intermediate shaft facing the first shaft. ### Claim 9 (depends on 5) The system according to claim 5, wherein the first shaft has a receptacle for the second shaft or for the intermediate shaft and wherein the central recess formed in the first shaft adjoins the receptacle and wherein the at least one transverse channel is formed in the first shaft. ### Claim 10 (depends on 9) The system according to claim 9, wherein a front-side end face of the first shaft is sealed with respect to the hydraulic unit. ### Claim 11 (depends on 1) The system according to claim 1, wherein the shaft-hub connection is connected fluidically outside the second shaft via at least one passage to the leakage oil chamber of the hydraulic unit. ### Claim 12 (depends on 1) The system according to claim 1, wherein the hydraulic unit is a swash plate unit, angled piston unit, gear pump unit, rotary vane unit or screw spindle unit. ### Claim 13 (depends on 1) The system according to claim 1, wherein a leakage oil outlet emerges from the leakage oil chamber. ### Claim 14 A system comprising an electric machine, wherein the electric machine comprises a first shaft, and a hydraulic unit, wherein the hydraulic unit comprises a second shaft, wherein the first shaft and the second shaft are connected to one another to form a shaft-hub connection,. the shaft-hub connection comprises a central recess the shaft-hub connection is fluidically connected to an interior of the hydraulic unit for lubrication and the hydraulic unit comprises a leakage oil chamber; wherein the central recess adjoins at least one transverse channel, wherein the at least one transverse channel extends from the central recess to an external circumference of the shaft-hub connection; and wherein the at least one transverse channel extends from the central recess to the leakage oil chamber. ### Claim 15 (depends on 14) The system according to claim 14, wherein the central recess extends as an axial channel from the at least one transverse channel through the second shaft to the shaft-hub connection.