# US 2014/0154112 A1 · Motor-pump unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0154112 A1 - Document ID: US20140154112A1 - Status: Published application - Kind: A1 - Application number: 14/176,737 - Filed: 2014-02-10 - Published: 2014-06-05 - Earliest claimed: 2011-08-15 - Assignees: Alfred Kärcher GmbH & Co. KG - Applicants: Alfred Kärcher GmbH & Co. KG - Inventors: Robert Nathan; Bernhard Gruber - Web page: https://patentgrep.com/patent/US20140154112A1 ## CPC - F04D 29/588: {cooling or heating the machine (F04D29/5886, F04D29/5893 take precedence)} - F04B 1/122: Details or component parts, e.g. valves, sealings or lubrication means (for machines or pumps having rotary cylinder blocks F04B1/2014) - F04B 17/03: driven by electric motors - F04B 17/06: Mobile combinations - F04B 39/064: {Cooling by a cooling jacket in the pump casing} - F04B 53/08: Cooling; Heating; Preventing freezing - H02K 5/20: with channels or ducts for flow of cooling medium - H02K 5/203: {specially adapted for liquids, e.g. cooling jackets} - H02K 7/14: Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) - B08B 2203/0223: Electric motor pumps - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) - B08B: CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL ## Abstract A motor-pump unit includes an electric motor and a pump. The electric motor has a motor housing, on the outside of which a cooling channel is arranged. The pump has a suction inlet and a pressure outlet. Liquid to be pressurized can be fed by way of the cooling channel to the suction inlet. In order that the motor-pump unit can be produced and assembled more cost-effectively, the motor housing includes a first housing part and a second housing part, which are connectable to each other in a liquid-tight manner and between them form the cooling channel. ## Claims ### Claim 1 A motor-pump unit for a high-pressure cleaning appliance, comprising an electric motor having a motor housing, on the outside of which a cooling channel is arranged, and comprising a pump driven by the electric motor and having a suction inlet for taking in liquid to be pressurized and a pressure outlet for discharging pressurized liquid, liquid to be pressurized being fed by way of the cooling channel to the suction inlet, wherein the motor housing comprises a first housing part and a second housing part, which are connectable to each other in a liquid-tight manner and between them form the cooling channel. ### Claim 2 (depends on 1) The motor-pump unit in accordance with claim 1, wherein the first housing part and the second housing part are adapted to be joined together in the axial direction in relation to the longitudinal axis of the motor-pump unit, thereby forming the cooling channel. ### Claim 3 (depends on 1) The motor-pump unit in accordance with claim 1, wherein at least one of the first housing part and the second housing part forms a bearing shield on which a motor shaft of the electric motor is mounted for rotation. ### Claim 4 (depends on 1) The motor-pump unit in accordance with claim 1, wherein at least one of the first housing part and the second housing part is shrunk onto a stator of the electric motor. ### Claim 5 (depends on 1) The motor-pump unit in accordance with claim 1, wherein at least one of the first housing part and the second housing part comprises a side wall surrounding the electric motor in the circumferential direction and a bottom wall covering the electric motor at an end face, with an area of the side wall that is adjacent to the cooling channel having a larger wall thickness than the bottom wall. ### Claim 6 (depends on 1) The motor-pump unit in accordance with claim 1, wherein the first housing part and the second housing part each comprise a cooling channel wall, the cooling channel walls being connectable to each other in a liquid-tight manner and forming between them the cooling channel when the two housing parts are joined together. ### Claim 7 (depends on 6) The motor-pump unit in accordance with claim 6, wherein at least one cooling channel wall is of groove-shaped configuration. ### Claim 8 (depends on 1) The motor-pump unit in accordance with claim 1, wherein the first housing part and the second housing part form between them a drainage channel which has at least one outlet opening and is arranged between the cooling channel and the electric motor. ### Claim 9 (depends on 8) The motor-pump unit in accordance with claim 8, wherein at least one sealing element is arranged between the cooling channel and the drainage channel. ### Claim 10 (depends on 8) The motor-pump unit in accordance with claim 8, wherein the first housing part and the second housing part each comprise a drainage channel wall, the drainage channel walls being connectable to each other in a liquid-tight manner and forming between them the drainage channel when the two housing parts are joined together. ### Claim 11 (depends on 10) The motor-pump unit in accordance with claim 10, wherein the two drainage channel walls overlap each other in the axial direction. ### Claim 12 (depends on 1) The motor-pump unit in accordance with claim 1, wherein at least one of the first housing part and the second housing part is made of metal.