# US 11,306,687 B2 · Engine exhaust manifold > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,306,687 B2 - Document ID: US11306687B2 - Status: Granted - Kind: B2 - Application number: 17/096,928 - Filed: 2020-11-12 - Published: 2021-07-01 - Granted: 2022-04-19 - Earliest claimed: 2019-12-31 - Assignees: Kubota Corporation - Applicants: KUBOTA Corporation - Inventors: Kentaro Nagai; Ryutaro Komura; Takashi Yamaguchi; Kumiko Sakaguchi; Takahiro Yamazaki - Web page: https://patentgrep.com/patent/US11306687B2 ## CPC - F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor - F02M 26/12: characterised by means for attaching parts of an EGR system to each other or to engine parts - F02B 37/02: Gas passages between engine outlet and pump drive, e.g. reservoirs - F02M 26/14: in relation to the exhaust system - F02M 26/22: with coolers in the recirculation passage - F02M 26/30: Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine - F02M 26/41: characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers - F02M 26/43: in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine - F02N 11/00: Starting of engines by means of electric motors - F02N 15/006: {Assembling or mounting of starting devices} - F01N 5/04: the devices using kinetic energy - F01N 13/10: of exhaust manifolds {(with cooling jacket F01N3/046)} - F01N 13/1805: {Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body (pipe joints in general F16L; fixing auxiliaries in motor vehicles in general B60K)} - F01N 13/1838: {characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles} - F01N 13/1855: {the connection being realised by using bolts, screws, rivets or the like} - F01P 2060/16: Outlet manifold - F02F 1/243: {Cylinder heads and inlet or exhaust manifolds integrally cast together} - Y02T 10/12: Improving ICE efficiencies - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02N: STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - 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) - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An engine exhaust manifold including exhaust inlet parts at four locations corresponding to a plurality of exhaust ports, one exhaust outlet part, and an exhaust confluence part to collect exhaust gas from each of the exhaust inlet parts and send to the exhaust outlet part. An EGR passage part to send EGR gas toward an intake passage is formed. ## Claims ### Claim 1 An engine exhaust manifold comprising: an exhaust inlet part corresponding to a plurality of exhaust ports; one exhaust outlet part; an exhaust confluence part to collect exhaust gas from the exhaust inlet part and send to the exhaust outlet part, the engine exhaust manifold being formed with an EGR passage part to send EGR gas toward an intake passage, the EGR passage part being formed at one end part in a longitudinal direction of the exhaust confluence part; and a gas lead-out part to take out EGR gas formed at another end part in the longitudinal direction of the exhaust confluence part, wherein, mounting parts to mount an EGR passage member connecting both the gas lead-out part and the EGR passage part are provided at starting ends of the gas lead-out part and the EGR passage part. ### Claim 2 (depends on 1) The engine exhaust manifold according to claim 1, wherein the mounting part of the EGR passage part is a flange part to bolt the EGR passage member, and the flange part is continuous with the exhaust confluence part. ### Claim 3 (depends on 1) The engine exhaust manifold according to claim 1, wherein a terminal mounting part to connect a terminal-side EGR passage part is formed at a terminal end of the EGR passage part, and the terminal mounting part is also a mounting part to mount one of a plurality of the exhaust inlet parts to a cylinder head. ### Claim 4 (depends on 1) The engine exhaust manifold according to claim 1, wherein a guide part to guide cooling air to an engine auxiliary machine is formed. ### Claim 5 (depends on 4) The engine exhaust manifold according to claim 4, wherein the guide part is configured with the EGR passage part formed in the exhaust confluence part. ### Claim 6 (depends on 5) The engine exhaust manifold according to claim 5, wherein an EGR passage having a tubular shape is formed inside the EGR passage part, and an outer shape of the EGR passage part is set to have a curved surface that matches a shape of the EGR passage. ### Claim 7 (depends on 5) The engine exhaust manifold according to claim 5, wherein a bolt hole to bolt the exhaust inlet part to a cylinder head is formed between the EGR passage part and the exhaust confluence part. ### Claim 8 (depends on 5) The engine exhaust manifold according to claim 5, wherein the EGR passage part is formed at one end part in a longitudinal direction of the exhaust confluence part, and a gas lead-out part to take out EGR gas is formed at another end part in the longitudinal direction of the exhaust confluence part. ### Claim 9 (depends on 8) The engine exhaust manifold according to claim 8, wherein, at starting ends of the gas lead-out part and the EGR passage part, mounting parts to mount an EGR passage member connecting both the gas lead-out part and the EGR passage part is provided. ### Claim 10 (depends on 1) The engine exhaust manifold according to claim 1, wherein an exhaust outlet part to a supercharger is provided at a position other than a central part in a longitudinal direction of the exhaust confluence part, and the exhaust outlet part is formed in a state of being taken out from the exhaust confluence part in a direction intersecting the longitudinal direction, and having a curved detour shape. ### Claim 11 (depends on 10) The engine exhaust manifold according to claim 10, wherein an internal threaded part to bolt an exhaust introduction part of the supercharger is formed in the exhaust outlet part, and an exhaust outlet passage formed in the exhaust outlet part is formed in a curved shape that detours the internal threaded part. ### Claim 12 (depends on 11) The engine exhaust manifold according to claim 11, wherein, in the exhaust outlet passage, a width of a portion that detours the internal threaded part is expanded in a direction intersecting a detour direction. ### Claim 13 (depends on 12) The engine exhaust manifold according to claim 12, wherein expansion of a width of the portion that detours is made by providing an angle at a boundary between the exhaust outlet passage and an exhaust confluence passage formed in the exhaust confluence part. ### Claim 14 (depends on 10) The engine exhaust manifold according to claim 10, wherein a take-out point of the exhaust outlet part from the exhaust confluence part is arranged on an extension line of any one of a plurality of the exhaust branch pipes. ### Claim 15 (depends on 14) The engine exhaust manifold according to claim 14, wherein four of the exhaust branch pipes are aligned, and the take-out point is provided on an extension line of a second or third exhaust branch pipe. ### Claim 16 (depends on 10) The engine exhaust manifold according to claim 10, wherein, among both end parts of the exhaust confluence part, a gas lead-out part for EGR is provided at a far side end part with the exhaust outlet part as a reference.