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Diaphragm carburetor

  • US 6,234,456 B1
  • Filed: 07/23/1999
  • Issued: 05/22/2001
  • Est. Priority Date: 07/25/1998
  • Status: Expired due to Fees
First Claim
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1. A diaphragm carburetor for an internal combustion engine, said carburetor comprising:

  • a carburetor housing (3) having an intake channel (4) with a venturi section (6);

    a plate valve (7, 8) positioned in said intake channel (4);

    a fuel outlet valve (19) mounted in said venturi section (6);

    a fuel-filled control chamber (15);

    a diaphragm (16) delimiting one side of said control chamber (15);

    a fuel supply channel (13) connected to said control chamber (15);

    a supply valve (14) mounted in said fuel supply channel (13) and actuated by said diaphragm (16);

    a first fuel channel (18) connected to said control chamber (15) and said fuel outlet valve (19);

    at least one main throttle (20) mounted in said first fuel channel (18) having a fixed fuel flow cross-section;

    at least one fixed throttle (25) mounted in a second fuel channel (21) for providing a constant fuel flow to said at least one main throttle (20);

    a lever (29, 34) actuating said plate valve (7, 8);

    an adjustable stop (30, 35) cooperating with said lever (29, 34), wherein a flow cross-section of the intake air is adjusted by said stop (30, 35) to a desired rich mixture limit and is changeable, in a limited range, in a direction of increasing the flow cross-section.

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