An exhaust gas recirculation system for an engine includes a conduit, and a mixer. The conduit is configured to direct to direct exhaust gas away from an exhaust manifold. The mixer is configured to direct exhaust gas from the conduit, into an engine air intake system. The mixer is arranged with an exhaust gas mixing volute chamber having a plurality of mixing vanes configured to direct the exhaust gas into a central intake airflow upstream of an intake manifold.

An exhaust gas recirculation system for an engine includes a conduit, and a mixer. The conduit is configured to direct to direct exhaust gas away from an exhaust manifold. The mixer is configured to direct exhaust gas from the conduit, into an engine air intake system. The mixer is arranged with an exhaust gas mixing volute chamber having a plurality of mixing vanes configured to direct the exhaust gas into a central intake airflow upstream of an intake manifold.

A valve for regulating two gas flows, includes a housing, two channels arranged in the housing for conducting a respective gas, a first flap arranged in the first channel for opening and closing the first channel, said first flap being rotatably arranged on a shaft, an electric motor for actuating the shaft, a second flap for opening and closing the second channel, and a third channel into which the first and the second channel lead. A connecting element is arranged on the first flap, and the first flap is connected to the second flap.

A valve for regulating two gas flows, includes a housing, two channels arranged in the housing for conducting a respective gas, a first flap arranged in the first channel for opening and closing the first channel, said first flap being rotatably arranged on a shaft, an electric motor for actuating the shaft, a second flap for opening and closing the second channel, and a third channel into which the first and the second channel lead. A connecting element is arranged on the first flap, and the first flap is connected to the second flap.

This air intake apparatus includes an air intake apparatus body including an intake air passage and an external gas passage portion provided as a structure separate from the air intake apparatus body inside the air intake apparatus body, the external gas passage portion through which external gas can be introduced into the intake air passage.

This air intake apparatus includes an air intake apparatus body including an intake air passage and an external gas passage portion provided as a structure separate from the air intake apparatus body inside the air intake apparatus body, the external gas passage portion through which external gas can be introduced into the intake air passage.

A housing has an outer pipe, an inner pipe, and an EGR inlet. The inner pipe is located inside the outer pipe. The inner pipe defines an inner passage internally. The inner pipe defines an annular passage externally with the outer pipe. The EGR inlet defines an EGR channel therein to communicate with the annular passage. The inner pipe has an end surface defining a throttle passage extending circumferentially. The throttle passage communicates the annular passage with the inner passage radially inward. The throttle passage is narrow on a side of the EGR channel and is wide on an opposite side of the EGR channel.

A housing has an outer pipe, an inner pipe, and an EGR inlet. The inner pipe is located inside the outer pipe. The inner pipe defines an inner passage internally. The inner pipe defines an annular passage externally with the outer pipe. The EGR inlet defines an EGR channel therein to communicate with the annular passage. The inner pipe has an end surface defining a throttle passage extending circumferentially. The throttle passage communicates the annular passage with the inner passage radially inward. The throttle passage is narrow on a side of the EGR channel and is wide on an opposite side of the EGR channel.

A bent section (71) is provided. An intake gas outlet (71B) downstream of the bent section (71) is connected to an intake manifold (11C). A throttle valve (47A) is disposed in the vicinity of and upstream of an intake gas inlet (71A) upstream of the bent section (71). An EGR pipe (13) is connected to the bent section (71). A rotation shaft (48) of the throttle valve (47A) is provided so as to be perpendicular to a first plane (75) including an inlet side intake pipe axis (72A) passing through the intake gas inlet (71A) and an outlet side intake pipe axis (72B) passing through the intake gas outlet (71B). An outer surface, which is intersected by the first plane (75), of the bent section (71) is formed to include a first sidewall surface (73A) extending in parallel to the inlet side intake pipe axis (72A) toward a bent side, a second sidewall surface (73B) extending in parallel to the outlet side intake pipe axis (72B) toward the bent side, and an outer curved surface (73C) having a predetermined radius of curvature configured to connect bent side ends of the first sidewall surface (73A) and the second sidewall surface (73B).

A bent section (71) is provided. An intake gas outlet (71B) downstream of the bent section (71) is connected to an intake manifold (11C). A throttle valve (47A) is disposed in the vicinity of and upstream of an intake gas inlet (71A) upstream of the bent section (71). An EGR pipe (13) is connected to the bent section (71). A rotation shaft (48) of the throttle valve (47A) is provided so as to be perpendicular to a first plane (75) including an inlet side intake pipe axis (72A) passing through the intake gas inlet (71A) and an outlet side intake pipe axis (72B) passing through the intake gas outlet (71B). An outer surface, which is intersected by the first plane (75), of the bent section (71) is formed to include a first sidewall surface (73A) extending in parallel to the inlet side intake pipe axis (72A) toward a bent side, a second sidewall surface (73B) extending in parallel to the outlet side intake pipe axis (72B) toward the bent side, and an outer curved surface (73C) having a predetermined radius of curvature configured to connect bent side ends of the first sidewall surface (73A) and the second sidewall surface (73B).