Recirculation exhaust gas introduction structure of intake manifold

摘要

PPROBLEM TO BE SOLVED: To introduce recirculation exhaust gas by preventing heat damage on an intake manifold with a structure which is less bulky, simple, and inexpensive, and with an assembling property. PSOLUTION: The recirculation exhaust gas introduction structure includes: an inner and outer communication port 3 arranged on a mounting seat 10 on a cylinder head 2 of the intake manifold 1; a recirculation port 4b of an EGR passage facing to the communication port 3 from an inside of the cylinder head; and an exhaust gas introduction pipe connected to the recirculation port 4b. The exhaust gas introduction pipe 5 includes a base part 5a inserted and connected to the recirculation port 4b. A part of a fastening seat 5b projected from the exhaust gas introduction pipe 5 is fastened with a screw on a cylinder head side mounting surface 2a. A screw fastening operation direction is set so that a co-rotating direction of the exhaust gas introduction pipe 5 on the screw fastening operation is on a side closer to a circumferential wall of the communication port 3 in a play S with the recirculation port 4b to solve a problem. PCOPYRIGHT: (C)2011,JPO&INPIT