ENGINE INTAKE AND EXHAUST SYSTEM AND INTERNAL COMBUSTION ENGINE
FIG7 is a perspective view illustrating a connecting structure for an intake pipe, an EGR pipe and a blow-by gas introduction pipe of the engine
The blow-by gas introduction pipe 31 extends from an oil separator provided inside a cylinder head cover 32 of the engine illustrated in FIG7. The blow-by gas is separated from oil in the oil separator and introduced into the intake passage.
perspective view
17
EGR valve
14
flexible exhaust pipe
16
EGR pipe
15
EGR cooler
31
gas introduction pipe
32
cylinder head cover
['1. An intake and exhaust system for an engine (1), comprising: an exhaust gas recirculation (EGR) passage (15, 16, 17) configured to recirculate a portion of exhaust gas as EGR gas, from an exhaust passage (2a, 11, 12, 13, 14) of the engine (1) to an intake passage (2b, 3, 4, 5, 8); and an EGR cooler (15) disposed in the EGR passage (15, 16, 17), the EGR cooler (15) being coupled to a passage wall of the exhaust passage (2a, 11, 12, 13, 14) at an EGR gas inlet side, and having a center line intersecting with a flow direction of exhaust gas in the exhaust passage (2a, 11, 12, 13, 14), wherein a through-hole (18) communicating the EGR cooler (15) with the exhaust passage (2a, 11, 12, 13, 14) is a long hole (18) elongated substantially in the flow direction in the exhaust passage (2a, 11, 12, 13, 14), wherein an exhaust gas purifier (12) is provided in an intermediate part of the exhaust passage (2a, 11, 12, 13, 14), wherein the exhaust gas passage (2a, 11, 12, 13, 14) has a curved pipe (13) on a downstream side of the exhaust gas purifier (12) in the flow direction to change the flow direction, wherein the through-hole (18) communicating the EGR cooler (15) with the exhaust passage (2a, 11, 12, 13, 14) opens to a passage wall of the curved pipe (13) of the exhaust passage (2a, 11, 12, 13, 14) at an outer circumferential side of the curve of the exhaust passage on an upper surface of the curved pipe (13), and the EGR cooler (15) is directly attached to the curved pipe (13).']