Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Digital camera supporting intelligent self-timer mode and method of controlling the same
Touch screen panel
PLL circuit
Permanent magnet axial field zeeman slower
Methods of reverse link power control
System and method for managing self-refresh in a multi-rank memory
System for programming domestic appliances and method for programming assembly-line programmable domestic appliances
  Randomly Featured Patents
Doped silicon structure with impression image on opposing roughened surfaces
Network device manager
Method and system for unifying component metadata
Gift card holder for a floral arrangement
Body washing device
Method of manufacturing sintered ceramic body
Human-propelled vehicles
Electrostatic discharge protection for power amplifier in radio frequency integrated circuit
Method for treating sludge precipitated in a plating bath containing haloid ions
File sheet for compact discs