# US 2018/0320692 A1 · Coolant pump for the automotive industry > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320692 A1 - Document ID: US20180320692A1 - Status: Published application - Kind: A1 - Application number: 15/772,813 - Filed: 2016-07-21 - Published: 2018-11-08 - Earliest claimed: 2015-11-06 - Assignees: Pierburg GmbH - Applicants: Pierburg GmbH - Inventors: STEPHAN ZIELBERG; MICHAEL-THOMAS BENRA; STEFAN ROTHGANG; ANDREAS BURGER; HELMUT PRINZ - Web page: https://patentgrep.com/patent/US20180320692A1 ## CPC - F04D 15/0038: {by varying the effective cross-sectional area of flow through the rotor} - F01P 5/10: Pumping liquid coolant; Arrangements of coolant pumps - F04D 5/002: {Regenerative pumps (for elastic fluids F04D23/008)} - F04D 13/12: Combinations of two or more pumps (combinations with priming pumps or booster pumps to counteract vapour-lock F04D9/04) - F01P 2003/001: {Cooling liquid} - F01P 2005/105: {Using two or more pumps} - F05D 2270/64: Hydraulic actuators - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A coolant pump includes a conveying channel, a drive shaft, a coolant pump impeller arranged on the drive shaft, a control slide which controls a flow cross-section of an annular gap between an exit of the coolant pump impeller and the conveying channel, a side channel pump which includes a side channel pump impeller arranged on the drive shaft and a side channel having an inlet and an outlet where a pressure can be generated by the side channel pump impeller rotating, a pressure channel having a flow cross section which fluidically connects the outlet to a first pressure chamber of the control slide, a valve which closes the flow cross-section, a second pressure chamber arranged on a side of the control slide facing the coolant pump impeller, and a connection channel arranged from the side channel into the second pressure chamber between the inlet and the outlet. ## Claims ### Claim at position 1 1-14. (canceled) ### Claim 15 A coolant pump for the automotive industry, the coolant pump comprising: a conveying channel; a drive shaft; a coolant pump impeller arranged on the drive shaft so as to rotate jointly therewith, the coolant pump impeller being configured to convey a coolant into the conveying channel which surrounds the coolant pump impeller; a control slide which is configured to be movable so as to control a flow cross-section of an annular gap arranged between an exit of the coolant pump impeller and the conveying channel, the control slide comprising a first pressure chamber; a side channel pump comprising a side channel pump impeller arranged on the drive shaft so as to rotate jointly therewith, and a side channel which is configured so that a pressure can be generated by a rotation of the side channel pump impeller, the side channel comprising an inlet and an outlet; a pressure channel comprising a flow cross section, the pressure channel being configured to fluidically connect the outlet of the side channel to the first pressure chamber of the control slide; a valve configured to close the flow cross-section of the pressure channel; a second pressure chamber arranged on a side of the control slide facing the coolant pump impeller; and a connection channel arranged from the side channel into the second pressure chamber between the inlet and the outlet. ### Claim 16 (depends on 15) The coolant pump as recited in claim 15, wherein the connecting channel is designed as a bore. ### Claim 17 (depends on 15) The coolant pump as recited in claim 15, wherein the connecting channel is arranged substantially centrally between the inlet and the outlet. ### Claim 18 (depends on 15) The coolant pump as recited in claim 15, further comprising: a first housing part, wherein, the control slide is further configured to be slidably guided on the first housing part, the coolant pump impeller is formed integrally with the side channel pump impeller, and the side channel is arranged in the first housing part. ### Claim 19 (depends on 18) The coolant pump as recited in claim 18, wherein, the side channel pump impeller comprises blades which are formed on a rear side of the coolant pump impeller, the coolant pump impeller is formed as a radial pump impeller, and the blades are arranged axially opposite to the side channel. ### Claim 20 (depends on 18) The coolant pump as recited in claim 18, wherein the second pressure chamber is arranged between a bottom of the control slide and the first housing part in which the side channel is arranged. ### Claim 21 (depends on 18) The coolant pump as recited in claim 18, wherein, the control slide further comprises an outer circumferential wall, and the side channel further comprises a radially outer delimiting wall which extends axially in a direction of the coolant pump impeller, radially surrounds the side channel pump impeller, and is radially surrounded by the outer circumferential wall of the control slide. ### Claim 22 (depends on 18) The coolant pump as recited in claim 18, wherein the first pressure chamber is formed on an axial side of the control slide which is averted from the coolant pump impeller. ### Claim 23 (depends on 18) The coolant pump as recited in claim 18, wherein, the first housing part comprises an annular, axially extending projection which comprises an outer surface, and the control slide is further configured to be slidably guided on the outer surface of the annular, axially extending projection of the first housing part. ### Claim 24 (depends on 23) The coolant pump as recited in claim 23, wherein the annular, axially extending projection of the first housing part is configured to delimit each of the first pressure chamber and the second pressure chamber radially inwardly. ### Claim 25 (depends on 24) The coolant pump as recited in claim 24, further comprising: a second housing part, wherein, the pressure channel is further configured to extend from the outlet of the side channel of the side channel pump through the first housing part and the second housing part into the first pressure chamber, and the flow cross section controlled by the valve is formed in the second housing part. ### Claim 26 (depends on 25) The coolant pump as recited in claim 25, wherein, the second housing part comprises a receiving opening; the second housing part is fastened to the first housing part, and the annular, axially extending projection of the first housing part comprises a shoulder at an axial end from which an annular projection is configured to extend further axially into the receiving opening of the second housing part. ### Claim 27 (depends on 26) The coolant pump as recited in claim 26, further comprising screws configured to fasten the first housing part to the second housing part.