| 摘要 |
PURPOSE:To obtain smooth fuel injection even if a machine is used on a slant ground by providing a main body of a ventilating system constructed to connect several air holes opened in a float chamber to the open air via annular grooves going over half round between the upper part of the float chamber and the lower part of a carburetter main body. CONSTITUTION:In a carburetter in a portable work machine engine for a mower and the like, a fuel nozzle 3 is provided to be opened to a Venturi of a carburetter main body 1 in one end, and in a float chamber 2 in another end. In the float chamber 2, fuel is contained to maintain a fixed oil face 6 constantly by opening and closing a float valve 4 linked with a float 5. At this stage, a ventilation system main body 8 is provided between a carburetter main body 1 and a float chamber 2 with gaskets 9 and 10 between. This ventilation main body 8 is provided with three or more air holes 11 opened in the float chamber 2 and annular grooves 12 grooved on the upper face of the main body 8 to connect between central annular grooves 13 and the air-holes 11 going at least over half round. |
