| 摘要 |
There is disclosed an intake control valve device for an internal combustion engine in which a high sealing effect of a valve can be achieved even if dispersions in the machining precision etc. of the valve, a valve shaft and other portions as well as thermal strain deformation of these parts cause. The intake control valve device includes a butterfly-type valve provided in an intake passage in a body. A valve seat surface, which can face an outer peripheral portion of an upstream-side surface of the valve at one half-periphery portion of the valve, disposed on one side of a valve shaft, is formed on the body, and another valve seat surface, which can face an outer peripheral portion of a downstream-side surface of the valve at another half-periphery portion of the valve, disposed on another side of said valve shaft, is formed on the body. The angle theta 3 of inclination of each of the two valve seat surfaces is larger than the angle theta 4 of inclination of the valve in its fully-closed condition.
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