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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTomoaki Makino, Masahiro Arakawa, Tomiyoshi Mitsui
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A slidable throttle valve assembly for a carburetor comprising a carburetor body with an intake passage therein, a slidable throttle valve movable across the intake passage, and a throttle valve guide tube connected to the carburetor body and guidably supporting the slidable throttle valve. The carburetor body has guide grooves for guiding the slidable throttle valve which are respectively provided in the body at opposite sides of the intake passage so as to be continuous with the throttle valve guide tube. The throttle valve and guide grooves are of part-circular, cross-sectional shape so that the throttle valve and guide grooves come into contact with each other respectively along lines extending in the sliding direction of the slidable throttle valve downstream of the intake passage.
In a slidable throttle valve assembly for a carburetor having a carburetor body with an intake passage therein;
A method of guiding the sliding movement of a slidable throttle valve in a carburetor body having an air intake passage, said method comprising supporting a throttle valve for movement across an air intake passage in a carburetor body by slidably engaging end portions of the throttle valve in coextensive grooves respectively provided in a guide tube fixed to the carburetor body and in the wall of the intake passage for each end portion of the throttle valve and forming said grooves in the wall and said end portions of the slidable throttle valve so that upon operation, when air flows in said intake passage, suction force is applied to said throttle valve urging said valve downstream in said air intake passage and causing said end portions of the valve respectively to contact said grooves along lines extending in the sliding direction of said slidable throttle valve at downstream portions of the throttle valve to achieve sealing at said end portions, said throttle valve and guide grooves having a slight difference in curvature of respective surfaces adjacent their lines of contact during operation.
Dependencies are inferred from the claim text.