Carburetor pneumatic fuel atomizer and throttle valve

Claim 1

An engine carburetor including a throttle body means having a first end wall and an opposite second end wall, said throttle body means having an enlarged opening, rectangular in cross section, extending from said first end wall therethrough to define an induction passage having an air inlet end at said first end wall and an air-fuel induction outlet end at said second end wall, said passage being defined by an interior first wall means, an interior second wall means spaced from said first wall means, and by interconnecting side walls, said first wall means defining a convergent-divergent venturi nozzle portion for said passage, said throttle body means including a pivot support means having a pivot support positioned upstream of said first end wall, a movable throttle means including arm means pivotably connected at one end to said pivot support for pivotable movement about a pivot axis and throttle wall means fixed to its opposite end, one side of said throttle wall means defining a convergent-divergent venturi throttle nozzle portion extending into said passage for movement between said first wall means and said second wall means whereby to define with said first wall means a variable area venturi nozzle, said second wall means including a divergent wall portion opposite the divergent portion of said convergent-divergent nozzle portion defined by said first wall means and an arcuate wall portion extending away from said divergent wall portion to interconnect with said first end wall, the opposite side of said throttle wall means including a rear surface portion joining an arcuate surface portion, said arcuate surface portion being positioned to slide relative to said arcuate wall portion with a predetermined clearance therebetween and a groove means in said arcuate surface portion extending from a predetermined distance from the free end thereof to substantially said rear surface portion whereby to provide with said arcuate wall portion a controlled secondary air flow passage bypassing said variable venturi nozzle, an accelerator linkage means operatively connected to said movable throttle means to effect pivotable movement of said movable throttle means, a fuel injector nozzle means having a fuel discharge port means at one end and having its opposite end pivotably supported by said pivot support for pivotal movement about said pivot axis relative to the throttle means, said fuel injector nozzle means being connectable to a source of liquid fuel, said fuel discharge port means being positioned to discharge fuel to the upstream side of said variable area venturi nozzle, and fuel injector positioner linkage means operatively connected to said movable throttle means and to said fuel injector nozzle means whereby said fuel discharge port means is positioned substantially midway between said first wall means and said venturi throttle nozzle portion during movement of said venturi throttle nozzle portion relative to said first wall means.