Regulating unit for internal combustion engine of motor car, has adjusting portion and seat made of materials with different coefficients of thermal expansion, so that dimension of gaps are adjusted in different temperature ranges

摘要

The regulating unit (1) has adjusting portion (2) and seat (5). The adjusting portion is provided to adjust flow rate of fluid between a closed position and an opened position. The adjusting portion and the seat are made of materials having different coefficients of thermal expansion, so that dimension of specific gap is adjusted in low temperature range and dimension of preset gap between the adjusting portion and the seat is adjusted in high temperature range.