# US 5,707,012 A · Atomizing sieve and fuel injection valve having an atomizing sieve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,012 A - Document ID: US5707012A - Status: Granted - Kind: A - Application number: 08/505,295 - Filed: 1995-09-29 - Granted: 1998-01-13 - Earliest claimed: 1993-12-21 - Assignees: Robert Bosch GmbH - Inventors: Martin Maier; Jurgen Buchholz; Jorg Heyse; Michael Klaski; Edwin Liebemann; Klaus Wirth; Mathias Thomas; Klaus-Henning Krohn; Jutta Straetz; Stefan Lauter; Christof Dennerlein; Anwar Abidin - Web page: https://patentgrep.com/patent/US5707012A ## CPC - F02M 61/188: {Spherical or partly spherical shaped valve member ends} - F02M 53/06: with fuel-heating means, e.g. for vaporising - F02M 61/18: Injection nozzles, e.g. having valve seats; {Details of valve member seated ends, not otherwise provided for} - F02M 61/1806: {characterised by the arrangement of discharge orifices, e.g. orientation or size} - F02M 61/1853: {Orifice plates} - F02M 69/047: {injectors with air chambers, e.g. communicating with atmosphere for aerating the nozzles (F02M69/325 takes precedence)} - Y10S 239/23: Screens - Y10S 239/90: Electromagnetically actuated fuel injector having ball and seat type valve - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract An atomizing sieve of a fuel injection valve having a dish-like concavely cambered form is provided downstream of at least one spray orifice of the fuel injection valve, as seen in the direction of flow of fuel. The atomizing sieve is cast with an outer circumferential region in a protective cap provided at the downstream end of the fuel injection valve. For protection against mechanical effects, protective prongs of the protective cap project further downstream than the lowest region of the atomizing sieve. When the fuel is being injected, a part quantity collects in this lowest region and represents a comparatively static liquid quantity which new fuel then strikes. This arrangement allows an ideal break-up of the fuel into very small droplets. The atomizing sieve also forms a protective shield against icing-up, plugging and settlement of chemical substances within the fuel injection valve. ## Claims ### Claim 1 A fuel injection valve for supplying fuel to an internal combustion engine, the fuel injection valve having a longitudinal valve axis, comprising: a valve seat; a valve closing part cooperating with the valve seat; a spray disc connected to the valve seat, the spray disc having at least one spray orifice; and an atomizing sieve disposed downstream of the at least one spray orifice, the atomizing sieve including a sieve leaf having an inner portion allowing the passage of fuel, the inner portion deviating from a plane leaf shape. ### Claim 2 (depends on 1) The fuel injection valve according to claim 1, wherein the inner portion includes a camber having a dish shape. ### Claim 3 (depends on 2) The fuel injection valve according to claim 2, wherein the inner portion includes at least two cambers, each of the at least two cambers having a dish shape. ### Claim 4 (depends on 1) The fuel injection valve according to claim 1, wherein the sieve leaf is composed of a rust-proof metal. ### Claim 5 (depends on 4) The fuel injection valve according to claim 4, wherein the rust-proof metal includes one of a plastic material, a TEFLON.RTM. material, a PTC material and silicon. ### Claim 6 (depends on 1) The fuel injection valve according to claim 1, wherein the inner portion includes a mesh, the mesh having a mesh width at least as great as 0.1 mm. ### Claim 7 (depends on 1) The fuel injection valve according to claim 1, wherein the inner portion has one of a single layer construction and a multi-layer construction. ### Claim 8 (depends on 6) The fuel injection valve according to claim 6, wherein the mesh has a variable mesh width. ### Claim 9 (depends on 1) The fuel injection valve according to claim 1, wherein the sieve leaf is composed of a bi-metal. ### Claim 10 (depends on 1) The fuel injection valve according to claim 1, wherein an outer portion of the sieve leaf is at least partially attached to a clamping ring, the clamping ring facilitating mounting of the atomizing sieve on the fuel injection valve. ### Claim 11 (depends on 1) The fuel injection valve according to claim 1, further comprising: a valve seat carrier connected to the valve seat; and a protective cap mounted on a downstream end of the valve seat carrier, wherein an outer circumferential region of the sieve leaf is cast into the protective cap. ### Claim 12 (depends on 1) The fuel injection valve according to claim 1, wherein the sieve leaf includes at least one camber. ### Claim 13 (depends on 12) The fuel injection valve according to claim 12, wherein the sieve leaf includes two cambers, each of the cambers being arranged symmetrically to the longitudinal valve axis. ### Claim 14 (depends on 13) The fuel injection valve according to claim 13, wherein the sieve leaf includes two cambers, each of the cambers being arranged asymmetrically to the longitudinal valve axis. ### Claim 15 (depends on 13) The fuel injection valve according to claim 13, wherein the at least one camber is annular. ### Claim 16 (depends on 1) The fuel injection valve according to claim 1, wherein the atomizing sieve further includes a jet divider integrated on one of an upstream surface and a downstream surface of the sieve leaf. ### Claim 17 (depends on 1) The fuel injection valve according to claim 1, further comprising a jet divider disposed downstream of the atomizing sieve. ### Claim 18 (depends on 1) The fuel injection valve according to claim 1, wherein an annular gas gap is formed between the at least one spray orifice and the atomizing sieve so that the fuel emerging from the at least one spray orifice collides with a gas emerging from the annular gas gap, providing a fuel/gas mixture striking the atomizing sieve. ### Claim 19 (depends on 1) The fuel injection valve according to claim 1, further comprising a valve seat carrier connected to the valve seat and an insert part projecting at least partially into the valve seat carrier, wherein at least one supply duct is formed between the at least one spray orifice and the atomizing sieve in the insert part so that the fuel emerging from the at least one spray orifice collides with a gas emerging from the at least one supply duct, providing a fuel/gas mixture striking the atomizing sieve. ### Claim 20 (depends on 1) The fuel injection valve according to claim 1, further comprising: a valve seat carrier connected to the valve seat and; a protective cap mounted on a downstream end of the valve seat carrier, wherein at least one supply duct is formed in the protective cap so that the a gas emerging from the at least one supply duct strikes an outer surface of the sieve leaf facing away from the at least one spray orifice. ### Claim 21 (depends on 20) The fuel injection valve according to claim 20, wherein the at least one supply duct is formed so that an imaginary extension of the at least one supply duct is directed onto a lowest region of the outer surface of the sieve leaf. ### Claim 22 (depends on 20) The fuel injection valve according to claim 20, wherein the at least one supply duct is formed so that an imaginary extension of the at least one supply duct contacts the outer surface of the sieve leaf tangentially. ### Claim 23 (depends on 1) The fuel injection valve according to claim 1, wherein the atomizing sieve includes at least two atomizing sieves connected in series. ### Claim 24 (depends on 1) The fuel injection valve according to claim 1, further comprising a spacer body arranged between the at least one spray orifice and the atomizing sieve, the spacer body providing a spatial separation of a metering of fuel in a region of the at least one spray orifice and a treatment of fuel in a region of the atomizing sieve. ### Claim 25 (depends on 24) The fuel injection valve according to claim 24, wherein the spacer body and the atomizer sieve form an atomizer attachment. ### Claim 26 (depends on 24) The fuel injection valve according to claim 24, wherein the atomizing sieve is in a range of 5 to 100 mm from the at least one spray orifice. ### Claim 27 (depends on 24) The fuel injection valve according to claim 24, wherein the spacer body has a sleeve-shape and a side of the spacer body facing the at least one spray orifice includes at least one orifice for intaking a gas. ### Claim 28 (depends on 24) The fuel injection valve according to claim 24, wherein the spacer body has at least a partially double-walled construction, at least one interspace being formed between the walls of the double-walled construction of the spacer body, a gas being able to flow through the at least one interspace. ### Claim 29 (depends on 24) The fuel injection valve according to claim 24, wherein a jet divider is integrated in the spacer body. ### Claim 30 (depends on 24) The fuel injection valve according to claim 24, further comprising a gas tube extending essentially axially in the spacer body, the gas tube having a cross-section smaller than the spacer body and an outlet orifice adjacent to the atomizing sieve. ### Claim 31 (depends on 24) The fuel injection valve according to claim 24, further comprising a Venturi tube inside the spacer body, the Venturi tube having a cross-sectional reduction in relation to the spacer body. ### Claim 32 (depends on 24) The fuel injection valve according to claim 24, further comprising a gas guide insert inside the spacer body and downstream of the at least one spray orifice, the gas guide insert including at least one substantially axially extending flow-off face for a gas. ### Claim 33 (depends on 24) The fuel injection valve according to claim 24, wherein the spacer body includes an annular inflow gap for an inflow of gas, the annular inflow gap being formed downstream of the at least one spray orifice. ### Claim 34 A fuel injection valve for supplying fuel to an internal combustion engine, the fuel injection valve having a longitudinal valve axis, comprising: a valve seat; a valve closing part cooperating with the valve seat; a spray disc connected to the valve seat, the spray disc having at least one spray orifice; an atomizing sieve disposed downstream of the at least one spray orifice, the atomizing sieve including a sieve leaf having an inner portion allowing the passage of fuel, the inner portion deviating from a plane leaf shape; a valve seat carrier connected to the valve seat; a protective cap mounted on a downstream end of the valve seat carrier; and a clamping ring attached at least partially to an outer portion of the sieve leaf, the clamping ring being gripped between the valve seat carrier and the protective cap. ### Claim 35 (depends on 24) The fuel injection valve according to claim 24, wherein the protective cap is formed as a protective crown having at least two protective prongs extending away from the fuel injection valve. ### Claim 36 (depends on 35) The fuel injection valve according to claim 35, wherein the at least two protective prongs extend below a lowest region of the atomizing sieve. ### Claim 37 (depends on 34) The fuel injection valve according to claim 34, wherein the atomizing sieve and the protective cap form an exchangeable treatment attachment.