Main nozzle for carburetor
AssigneeKabushiki Kaisha Kenso
InventorMachiko Oshima
Life of this patent
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Abstract
A carbutetor having an intake pass, an axially movable throttle valve, a main nozzle, a main jet fixedly disposed on the lower end of the main nozzle having an axial channel, a conical surface and a planar surface. The main jet comprises a plurality of downwardly directed oblique holes formed on the conical surface and extending to the axial channel. The surface of the oblique holes is made of a rough surface in order to reduce the boundary layer of fuel flowing through the oblique holes, thereby creating a smooth flow of fuel and improving fuel efficiency.
Claims10
A carburetor having an intake pass, an axially moveable throttle valve for forming a variable venturi in said intake pass, a main nozzle disposed at said intake pass and having a channel therein extending in an axial direction between said intake pass and a lower end, a jet needle having a longitudinal portion disposed between a head at one end and a base at the other end, said base being mounted to and moveable by said throttle valve, said longitudinal portion comprising a taper portion gradually decreasing in diameter toward said head and having said tapering and head portion inserted into said main nozzle channel, a main jet fixedly disposed at said main nozzle lower end and having an axial channel contiguous with said main nozzle channel, wherein with axial movement of said throttle valve, a gap between said main nozzle and said jet needle being changeable so as to control the flow of a fuel taken in from said head of the jet needle;
- said main nozzle for the carburetor being characterized in that the lower end of the main jet fixedly provided on said main nozzle comprises a conical surface and a planar surface, said surfaces defining a truncated cone, said main jet comprises a plurality of downwardly directed oblique holes formed in said conical surface and extending to said main axial channel for fuel communication therewith.
A main jet for use in a carburetor having an intake pass, an axially moveable throttle valve for forming a variable venturi in said intake pass, a main nozzle disposed at said intake pass and having a channel therein extending in an axial direction between said intake pass and a lower end, a jet needle having a longitudinal portion disposed between a head at one end and a base at the other end, said base being mounted to and moveable by said throttle valve, said longitudinal portion comprising a taper portion gradually decreasing in diameter toward said head and having said tapering and head portion inserted into said main nozzle channel said main jet being fixedly disposed at said main nozzle lower end and having an axial channel contiguous with said main nozzle channel, the lower end of said main jet fixedly provided on said main nozzle comprising a conical surface and a planar surface, said surfaces defining a truncated cone, a plurality of downwardly directed, oblique holes being formed in said conical surface and extending to said main axial channel for fuel-communication therewith.
Dependencies are inferred from the claim text.