| 摘要 |
PURPOSE:To restrain carbon from being bitten in the vicinity of a valve support portion at an air fuel mixer mixing combustion air and fuel gas, by making larger than those of other portions the opening of the vicinity place of a valve body support portion out of an opening at a passage inner perimeter surface at the time of a throttle valve totally closed. CONSTITUTION:A gas mixer 1 has a venturi portion 5 formed at a passage 4 inside a body 3 connected to the air suction port 2 of a gas engine, and a throttle valve 7 whose opening/closing is controlled with a revolution number control tool, is arranged on the side of the air suction port 2 rather than this venturi portion 5. And gas fuel such as city gas or the like and combustion air are supplied to the venturi portion 5 respectively from a gas supply source 8 through a fuel supply quantity control tool 9 and through an air cleaner 10. In this instance, the opening size of a valve opening 18 between a passage inner perimeter surface 14 and a valve body 11's perimeter side surface 15 in the vicinity of the valve shaft support portion 17 of the throttle valve 7, is formed wider than the opening size of a valve opening 19 at other portions.
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