Abstract: A resin molded component includes a flange having a through-hole. A concave portion is formed on the surface of the flange that faces the component on which the flange is fitted. Flows of a molten resin material meet each other at a meeting portion in a region around the through-hole during a molding process, and a weld line is formed at the meeting portion. The concave portion is formed upstream of the meeting portion at which the flows of the molten resin material meet each other, and in the vicinity of the through-hole. The thickness of the resin material in the bottom portion of the concave portion is greater than the thickness of the resin material in the thinnest portion of the wall of the concave portion.

Abstract: A resin intake manifold is provided with two separated bodies manufactured by connecting protrusions of weld portions of the separated bodies to each other in accordance with a vibration welding, and a cover wall in which one of the weld portions is arranged in an inner side or an outer side of the protrusion with leaving space with the protrusion.

Abstract: A resin intake manifold is provided with two separated bodies manufactured by connecting protrusions of weld portions of the separated bodies to each other in accordance with a vibration welding, and a cover wall in which one of the weld portions is arranged in an inner side or an outer side of the protrusion with leaving space with the protrusion.

Abstract: An exhaust gas recirculation system for an internal combustion engine in which at least one metal plate is interposed between a cylinder head and an intake manifold, and an EGR gas passage is formed in the plate, wherein the EGR gas passage is formed in its lowest portion with an EGR gas outlet port communicated with an intake passage formed in the plate, so as to prevent condensed water from steam in the EGR gas from collecting within the EGR gas passage, thereby preventing corrosion of the plate.

Abstract: A resin intake manifold is provided with two separated bodies manufactured by connecting protrusions of weld portions of the separated bodies to each other in accordance with a vibration welding, and a cover wall in which one of the weld portions is arranged in an inner side or an outer side of the protrusion with leaving space with the protrusion.

Abstract: An intake manifold includes a manifold body and a joint. The joint is made of metal and includes an upstream-side portion and a downstream-side portion that are joined to each other. The upstream-side portion is joined to a manifold body on the upstream-side of the manifold body. The downstream-side portion is joined to the manifold on the downstream-side of the manifold.

Abstract: A resin intake manifold is provided with an integrally formed base member. The base member has a U-shaped curved distribution passage lower surface wall portion, an engine mounting flange portion formed in one end of the distribution passage lower surface wall portion, and a surge tank peripheral wall portion formed in another end and a lower surface side of the distribution passage lower surface wall portion. A resonator peripheral wall portion is integrally formed in a dead space in a lower surface side of the distribution passage lower surface wall portion and between the surge tank peripheral wall portion and the engine mounting flange portion. In accordance with the structure in which the wall itself constituting the resonator is formed by the structure member, it is possible to structure the resonator without enlarging a size of the intake manifold and without lowering the strength.

Abstract: An exhaust gas recirculation system for an internal combustion engine in which at least one metal plate is interposed between a cylinder head and an intake manifold, and an EGR gas passage is formed in the plate, wherein the EGR gas passage is formed in its lowest portion with an EGR gas outlet port communicated with an intake passage formed in the plate, so as to prevent condensed water from steam in the EGR gas from collecting within the EGR gas passage, thereby preventing corrosion of the plate.

Abstract: An intake manifold includes a manifold body and a joint. The joint is made of metal and includes an upstream-side portion and a downstream-side portion that are joined to each other. The upstream-side portion is joined to a manifold body on the upstream-side of the manifold body. The downstream-side portion is joined to the manifold on the downstream-side of the manifold.