Resources Contact Us Home
Variable Venturi carburetor

Image Number 6 for United States Patent #4302404.

A variable venturi carburetor wherein the suction piston is fully closed with respect to the venturi section at engine stop to elevate the negative pressure at the time of cranking, and is opened to a predetermined degree at the time of idling, thereby obtaining stable driving performance at a suitable air-fuel ratio. The suction piston slides, via a spring, into and out from a suction chamber communicating with a mixing chamber via a negative pressure path and has at its head a metering needle to face a metering jet. The low negative pressure occurring in the mixing chamber along with cranking is reliably applied to the gap between the metering needle and the metering jet which is wider than the gap in their matching state at the time of idling. Hence, the engine starts operating with an over-rich air-fuel ratio. The suction piston is shaped in such manner so as to close a venturi section on the upstream side with respect to the base portion of the metering needle at the time of stop of the engine. A venturi-crossing flange is disposed at a location corresponding to the position in the venturi section of either one or both of the suction piston head and a barrel member of the above-mentioned venturi section. Alternatively, an atmospheric pressure is communicated with the negative pressure to the suction chamber in order to enable driving at a set air-fuel ratio with a suitable lift movement.

  Recently Added Patents
Method and laser receiver for acoustically indicating a laser beam
Method and system for Bluetooth low power link layer connection setup
Electronic component and reflected-wave cancelling method
Data center with free-space optical communications
Multiple-frequency inversion method and control apparatus for internal combustion engine driven generator
System and method for access of user accounts on remote servers
  Randomly Featured Patents
Personal authentication apparatus and personal authentication method
Process for the preparation of methylene compounds and the novel compound 2-(2,4-Dichloro-5-fluorobenzyl)thiophene
Micro channel plate assembly
Handrail assembly
Incontinence and protective device for animals
Polyazanaphthalenone derivatives useful as alpha 1a adrenoceptor antagonists
Generating extended data from a pattern-recognition model for a computer system
Membrane module elements
Method for determining and using a climate energy index
Polyalkylene carbonates as processing aids for polyvinyl chloride