| 摘要 |
PROBLEM TO BE SOLVED: To provide an intake valve capable of contributing in improvement of combustion efficiency by inhibiting rise of intake air temperature, inhibiting increase of weight, and improving combustion efficiency also by acceleration of intake. SOLUTION: A valve main body 10 comprises a stem part 11 and a head part 12 provided on one end of the stem part 11 and including a head face surface facing a combustion chamber and a head back surface 14 facing intake air passage, and has a valve face 15 sticking to a valve seat on an outer circumference edge part of the head back surface 14. A back side heat insulating layer 20 composed of heat resistant resin is formed on the head back surface 14 excluding the valve face 15. The back side heat insulating layer 20 includes a straightening path 24 straightening intake air flow to the combustion chamber from the intake air passage to accelerate intake. COPYRIGHT: (C)2009,JPO&INPIT
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