# US 5,701,854 A · Axial fan for 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 5,701,854 A - Document ID: US5701854A - Status: Granted - Kind: A - Application number: 08/702,799 - Filed: 1996-08-26 - Granted: 1997-12-30 - Earliest claimed: 1994-10-26 - Assignees: Behr GmbH & Co. - Inventors: Kurt Hauser - Web page: https://patentgrep.com/patent/US5701854A ## CPC - F04D 29/545: {Ducts} - F01P 5/06: Guiding or ducting air to, or from, ducted fans - F04D 29/164: {of an axial flow wheel} - F04D 29/684: {by fluid injection} - 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) ## Abstract An axial fan arrangement for the radiator of an internal combustion engine including an annular bypass channel terminating between the fan frame and the fan. The bypass channel is open to the pressure sided of the fan and is designed such that the bypass flow emerging on the intake side of the fan is deflected in the direction of the main flow. By these measures the stabilization of a back flow vortex is rendered unnecessary. ## Claims ### Claim 1 Axial fan arrangement for the radiator of an internal combustion engine, comprising: fan blades, and a fixed jacket surrounding the fan blades and mounted at a distance from a radiator frame mounted on a vehicle radiator, wherein an annular bypass channel terminates between the radiator frame and the fan, which bypass channel is open on a pressure side of the fan and whose inside wall facing a main flow guided through the frame has a curvature such that the bypass flow emerging on the intake side of the fan is deflected in the direction of the main flow. ### Claim 2 (depends on 1) Axial fan arrangement according to claim 1, wherein the annular bypass channel is formed by the rear wall of the frame and a second wall located at a distance behind said rear wall, said second wall being supported on the rear wall of the frame by ribs distributed around the circumference. ### Claim 3 (depends on 2) Axial fan arrangement according to claim 2, wherein an elastic sleeve is provided between the second wall and the jacket. ### Claim 4 (depends on 2) Axial fan arrangement according to claim 2, wherein respective lengthwise central planes of the ribs are inclined at an angle .alpha. to a radial plane running through them. ### Claim 5 (depends on 2) Axial fan arrangement according to claim 2, wherein the ribs have a cross section that has a water drop profile. ### Claim 6 (depends on 2) Axial fan arrangement according to claim 2, wherein the number and spacing of the ribs differs from the number and spacing of the fan blades. ### Claim 7 (depends on 2) Axial fan arrangement according to claim 2, wherein the radiator frame has a nozzle-shaped constriction on its side facing the jacket, said constriction having at its end a smaller diameter than the fan diameter and the jacket diameter on the inlet side. ### Claim 8 (depends on 1) Axial fan arrangement according to claim 1, wherein the bypass channel is mounted on a fixed jacket of fan. ### Claim 9 (depends on 8) Axial fan arrangement according to claim 8, wherein a rear channel wall is formed by the jacket, and wherein an anterior channel wall is connected with the radiator frame by an elastic sealing element. ### Claim 10 (depends on 1) Axial fan arrangement according to claim 1, wherein the inlet area of the bypass channel expands funnelwise. ### Claim 11 (depends on 1) Axial fan arrangement according to claim 1, wherein the curvature of the outlet area of the bypass channel is made in the form of an arc of a circle. ### Claim 12 (depends on 11) Axial fan arrangement according to claim 11, wherein a tangent that lies at a forward channel wall of the bypass channel at the end of its outlet curvature runs parallel to the fan axis. ### Claim 13 (depends on 12) Axial fan arrangement according to claim 12, wherein a tangent that lies at an anterior channel wall of the bypass channel at the end of its outlet curvature is inclined outward at an angle that differs from the axial direction of the fan. ### Claim 14 (depends on 2) Axial fan arrangement according to claim 2, wherein the jacket of the fan is made integral with the second wall of the bypass channel. ### Claim 15 (depends on 3) Axial fan arrangement according to claim 3, wherein the jacket is expanded in the manner of a diffuser in the outward flow direction. ### Claim 16 (depends on 15) Axial fan arrangement according to claim 15, wherein the fan blades have in their outlet area a radial extension corresponding to the jacket extension. ### Claim 17 (depends on 2) Axial fan arrangement according to claim 2, wherein the inlet area of the bypass channel expands funnelwise. ### Claim 18 (depends on 6) Axial fan arrangement according to claim 6, wherein the inlet area of the bypass channel expands funnelwise. ### Claim 19 (depends on 9) Axial fan arrangement according to claim 9, wherein the inlet area of the bypass channel expands funnelwise. ### Claim 20 (depends on 2) Axial fan arrangement according to claim 2, wherein the curvature of the outlet area of the bypass channel is made in the form of an arc of a circle. ### Claim 21 (depends on 6) Axial fan arrangement according to claim 6, wherein the curvature of the outlet area of the bypass channel is made in the form of an arc of a circle. ### Claim 22 (depends on 21) Axial fan arrangement according to claim 21, wherein a tangent that lies at a forward channel wall of the bypass channel at the end of its outlet curvature runs parallel to the fan axis. ### Claim 23 (depends on 22) Axial fan arrangement according to claim 22, wherein a tangent that lies at an anterior channel wall of the bypass channel at the end of its outlet curvature is inclined outward at an angle that differs from the axial direction of the fan.