# US 2008/0184974 A1 · Exhaust gas recirculation apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0184974 A1 - Document ID: US20080184974A1 - Status: Published application - Kind: A1 - Application number: 12/020,817 - Filed: 2008-01-28 - Published: 2008-08-07 - Earliest claimed: 2007-02-05 - Assignees: Denso Corporation - Inventors: Takashi KOBAYASHI; Osamu Shimane - Web page: https://patentgrep.com/patent/US20080184974A1 ## CPC - F02M 26/51: EGR valves combined with other devices, e.g. with intake valves or compressors (combined with intake air throttles F02M26/64) - F02M 26/26: characterised by details of the bypass valve - F02M 26/28: with liquid-cooled heat exchangers - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF ## Abstract An exhaust gas recirculation apparatus includes a housing connected with an EGR cooler via a mount face. The housing has a valve chamber accommodating a selector valve. The housing has a partition extending from the mount face close to the valve chamber to divide first and second exhaust ports opened in the mount face. A first passage leads exhaust gas into the EGR cooler through the valve chamber. A second passage recirculates exhaust gas to the intake passage through the EGR cooler and the valve chamber. A bypass passage leads exhaust gas from the engine through the valve chamber to bypass the EGR cooler. A rotation axis of the selector valve is perpendicular to an axis of the mount face, and offset away from the partition. ## Claims ### Claim 1 An exhaust gas recirculation apparatus for recirculating exhaust gas of an engine from an exhaust passage to an intake passage, the apparatus comprising: an exhaust gas cooler for cooling exhaust gas recirculated to the intake passage; a housing connected with the exhaust gas cooler via a cooler mount face, the housing having a valve chamber communicated with four exhaust ports including first and second exhaust ports, the first and second exhaust ports being adjacent to each other and opened in the cooler mount face; a selector valve rotatably accommodated in the valve chamber for controlling communication among the four exhaust ports; and a rotation axis rotatably supporting the selector valve, wherein the housing has a partition extending from the cooler mount face close to the valve chamber, and the partition dividing the first and second exhaust ports, the housing has a first exhaust passage for leading exhaust gas from the engine into the exhaust gas cooler through the valve chamber, the housing further has a second exhaust passage for recirculating exhaust gas, which is cooled in the exhaust gas cooler, to the intake passage through the valve chamber, the housing further has a bypass passage for leading exhaust gas from the engine through the valve chamber to bypass the exhaust gas cooler, the rotation axis is substantially perpendicular to a cooler-mount-face axis passing through a center of the cooler mount face, and the rotation axis is offset away from the partition of the housing. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the first exhaust passage is inclined with respect to a center axis of the first exhaust port, and the first exhaust passage substantially linearly extends close to the first exhaust port. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the rotation axis is offset from the cooler-mount-face axis toward a second-exhaust-port axis passing through a center of the second exhaust port. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the valve chamber has a valve-chamber axis passing through a center of the valve chamber, and the valve-chamber axis is offset from the cooler-mount-face axis toward a second-exhaust-port axis passing through a center of the second exhaust port. ### Claim 5 (depends on 1) The apparatus according to claim 1, further comprising: a flow control valve provided to the housing for controlling a flow of exhaust gas recirculated to the intake passage; and an actuator provided to the housing for driving the flow control valve. ### Claim 6 (depends on 5) The apparatus according to claim 5, wherein the housing and an imaginary line, which is extended along a lateral side of the housing perpendicularly to the cooler mount face, therebetween define an actuator mount space for accommodating the actuator, and the imaginary line is in parallel with an exhaust-gas-cooler axis passing through a center of the exhaust gas cooler. ### Claim 7 (depends on 5) The apparatus according to claim 5, wherein the housing has an actuator mount face via which the housing is connected with the actuator, and the housing is formed of a metallic material having heat resistance higher than heat resistance of the actuator. ### Claim 8 (depends on 1) The apparatus according to claim 1, wherein the housing has a bypass passage wall separating the bypass passage from an exterior of the housing, the housing further has a cooler introduction passage wall separating the first exhaust passage from the exterior of the housing, and the bypass passage wall is thicker than the cooler introduction passage wall. ### Claim 9 (depends on 1) The apparatus according to claim 1, wherein the housing has a bypass passage wall separating the bypass passage from an exterior of the housing, the housing further has a cooler introduction passage wall separating the first exhaust passage from the exterior of the housing, and the cooler introduction passage wall is thinner than the bypass passage wall. ### Claim 10 (depends on 8) The apparatus according to claim 8, wherein the housing has a radiating portion exposed to an outer surface of the cooler introduction passage wall, and the radiating portion is adapted to dissipating heat of exhaust gas, which flows through the first exhaust passage, to air passing over an outer surface of the cooler introduction passage wall.