INTAKE PORT HEAT INSULATION STRUCTURE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To surely mount a plurality of intake pipe portions on a cylinder head while improving fuel consumption by suppressing increase of an intake temperature.SOLUTION: An intake manifold 20 having a plurality of intake pipe portions 44 is composed of a material having heat conductivity lower than that of a cylinder head 16. Connecting portions 46 are integrally disposed on end portions of the plurality of intake pipe portions 44 connected to the cylinder head 16. The connecting portions 46 include a plurality of intake port formation wall portions 48, and a mounting wall portion 50. The intake port formation wall portions 48 are respectively disposed on end portions of the plurality of intake pipe portions 44 and incorporated in the cylinder head 16 to configure the whole periphery of a wall surface 3002 of an upstream end of the intake port 30. The mounting wall portion 50 is applied to connect the plurality of intake port formation wall portions 48, and to mount the plurality of intake pipe portions 44 to the cylinder head 16.SELECTED DRAWING: Figure 1