Carburetor with fuel vapor control
AssigneeWalbro Japan, Inc.
InventorsTadaatsu Ichihara, Takeshi Sakaguchi
Life of this patent
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Abstract
A carburetor includes a body having a fuel and air mixing passage formed therein and an opening in fluid communication with the fuel and air mixing passage, a fuel metering assembly carried by the body and including a fuel metering diaphragm that defines at least part of a fuel chamber that is communicated with the opening, and a groove formed in the body and open to the fuel chamber. The groove communicates at one end with the opening so that fuel vapor in the groove can be moved from the fuel chamber to the fuel and air mixing passage via the groove and opening. The groove is preferably provided at least in part in a peripheral portion of the fuel chamber to guide vapor to a fuel jet as the fuel vapor moves within the fuel chamber.
Claims17
A carburetor, comprising:
- a body having a fuel and air mixing passage formed therein and an opening in fluid communication with the fuel and air mixing passage;
- a fuel metering assembly carried by the body and including a fuel metering diaphragm that defines at least part of a fuel chamber that is communicated with the opening;
- and
- a groove formed in the body and open to the fuel chamber, said groove communicating at one end with the opening so that fluid in the groove is communicated with the fuel and air mixing passage and extending outwardly from the opening to an end spaced from the opening.
A carburetor, comprising:
- a body having a fuel and air mixing passage formed therein and an opening in fluid communication with the fuel and air mixing passage;
- a fuel metering assembly carried by the body and including a fuel metering diaphragm that defines at least part of a fuel chamber that is communicated with the opening;
- and
- a plurality of grooves each being formed in the body in communication with the fuel chamber and in communication with the opening wherein at least two grooves are provided with each groove extending radially outwardly from the opening and being circumferentially spaced apart from each other.
A carburetor, comprising:
- a body having a fuel and air mixing passage formed therein and an opening in fluid communication with the fuel and air mixing passage;
- a fuel metering assembly carried by the body and including a fuel metering diaphragm that defines at least part of a fuel chamber that is communicated with the opening;
- and
- a groove formed in the body and open to the fuel chamber, said groove communicating at one end with the opening so that fluid in the groove is communicated with the fuel and air mixing passage wherein the groove extends from an outward end spaced from the opening to an end adjacent to the opening, with the outward end extending outwardly from the edge of the portion of the fuel chamber defined by the body.
A carburetor, comprising:
- a body having a fuel and air mixing passage formed therein and an opening in fluid communication with the fuel and air mixing passage;
- a fuel metering assembly carried by the body and including a fuel metering diaphragm that defines at least part of a fuel chamber that is communicated with the opening;
- and
- a groove formed in the body and open to the fuel chamber, said groove communicating at one end with the opening so that fluid in the groove is communicated with the fuel and air mixing passage wherein the fuel chamber is defined in part by a recess in the, body that has a narrowing wall and an upper wall and the groove is formed in at least a portion of both the narrowing wall and the upper wall.
Dependencies are inferred from the claim text.