# US 2008/0184945 A1 · Actuating Device Of A Recirculation Pump For A Cooling Circuit Of An Internal Combustion Engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0184945 A1 - Document ID: US20080184945A1 - Status: Published application - Kind: A1 - Application number: 11/791,368 - Filed: 2005-08-29 - Published: 2008-08-07 - Earliest claimed: 2004-11-23 - Assignees: Dayco Europe S.R.L. Con Unico Socio - Inventors: Andrea Guala; Gianluca Cariccia; Riccardo Seren Rosso - Web page: https://patentgrep.com/patent/US20080184945A1 ## CPC - F01P 5/12: Pump-driving arrangements - F01P 7/162: {by cutting in and out of pumps} - F04D 13/021: {containing a coupling} - F04D 13/027: {Details of the magnetic circuit} - F01P 2037/02: starting - 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) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract Actuating device for a recirculation pump of a cooling circuit of an internal combustion engine comprising a pulley suitable for being rotationally driven by the engine, a driven shaft for driving the pump and an electromagnetically controlled coupling interposed between the pulley and the driven shaft, in which the electromagnetic coupling comprises an electromagnet, coupling mechanism controlled by the electromagnet and mobile between an engagement position in which the pulley is connected to the driven shaft and a disengagement position, and an elastic member for maintaining an engagement member in the engaged position when the electromagnet is not energized. ## Claims ### Claim 1 An actuating device for a recirculation pump of a cooling circuit of an internal combustion engine comprising a driving member having a rotation axis (A) and adapted to be rotatably driven by the internal combustion engine, a driven member for driving said pump and an electromagnetically controlled coupling interposed between the driving member and the driven member, in which the coupling comprises an electromagnet, a coupling mechanism controlled by said electromagnet and movable between an engagement position in which said driving member is connected to said driven member and a disengagement position, and an elastic member maintaining said coupling mechanism in said engagement position when said electromagnet is not energized. ### Claim 2 (depends on 1) The device according to claim 1, wherein the electromagnet comprises a coil and a mobile armature. ### Claim 3 (depends on 2) The device according to claim 2, wherein the elastic member acts on said mobile armature in opposition with said coil. ### Claim 4 (depends on 2) The device according to claim 2, wherein the armature is rotationally rigidly connected to one of said driving member or driven member, said coupling member comprising a friction element rigidly connected to said armature and adapted to cooperate with the other of said driving member or driven member. ### Claim 5 (depends on 4) The device according to claim 4, wherein said armature is rotationally rigidly connected to said driven member via said elastic member. ### Claim 6 (depends on 5) The device according to claim 5, wherein said friction element is a friction disk carried by said armature and adapted to cooperate frontally with said driving member. ### Claim 7 (depends on 6) The device according to claim 6, wherein said elastic member comprises a diaphragm spring connecting the armature to a supporting element rigidly connected to said driven member. ### Claim 8 (depends on 1) device according to claim 1, wherein said coupling member comprises a band spring wound partially on a first element rigid with the driving member and partially on a second element rigid with said driven member, said band spring exerting an elastic tightening action such as to rotationally constrain said first and second element together. ### Claim 9 (depends on 8) The device according to claim 8, wherein said elastic member comprises a second spring coaxial with said band spring and interposed between said armature and said second element, said band spring having one end fastened to said second element and one end fastened to said armature, so that the action of said coil on said armature produces a shift such as to deform the band spring and disengage it from said first element. ### Claim 10 (depends on 8) The device according to claim 8, wherein said band spring has an end fastened to said second element and a second free end; said armature being movable between a position of disengagement of said second end of the band spring and a position of engagement with said second end of the band spring, the engagement between said armature and said second end of the band spring determining a torsional load on said band spring such as to disengage it from said first element. ### Claim 11 (depends on 10) The device according to claim 10, wherein said armature is a diaphragm spring having an outer portion fastened to a support of said electromagnet and an inner portion forming an appendix adapted to cooperate with said second end of said band spring. ### Claim 12 (depends on 6) The device according to claim 6, further comprising a hub element is rigidly connected to said driven member, and said armature is rotationally fixed to, but axiall slidable on, said hub element. ### Claim 13 (depends on 12) The device according to claim 12, wherein said elastic member is carried by said hub element. ### Claim 14 (depends on 13) The device according to claim 13, wherein said armature is coupled to said hub element by a spline. ### Claim 15 (depends on 12) The device according to claim 12, wherein said hub element has front teeth, said armature having an internal spline defined by a plurality of radial projections spaced by cavities that are slidingly engaged by said front teeth of said hub element. ### Claim 16 (depends on 15) The device according to claim 15, wherein said elastic member include a plurality of springs compressed between said hub element and said armature. ### Claim 17 (depends on 16) The device according to claim 16, wherein said support element is cup shaped and has a cylindrical wall provided with said front teeth, said springs being located each between two adjacent teeth of said hub element and cooperating with a respective radial projection of said armature. ### Claim 18 (depends on 17) The device according to claim 17, wherein said springs are partially housed within respective blind holes of said cylindrical wall of said hub element. ### Claim 19 (depends on 1) The device according to claim 1, wherein said driving member is a pulley and that said coupling mechanism is contained in a cavity adjacent said pulley. ### Claim 20 (depends on 1) The device according to claim 1, wherein said driven member is an input shaft of said pump.