Variable venturi-type carburetor with automatic vacuum regulation and cam control mechanism

A variable venturi-type carburetor with automatic vacuum regulation and cam control mechanism, comprising:

• a base defining a central channel having an upper inlet end and a lower outlet end;
• a variable venturi assembly situated in a middle of the central channel, the variable venturi assembly comprising a support, a conical body, and a resilient member, wherein the support is fixed in the base, a bottom of the conical body is movably connected to the support, a surface of the conical body and the base define a venturi throat, and wherein the resilient member is situated between the support and the conical body;
• a fuel reservoir provided in the base;
• a path structure communicating the fuel reservoir and the venturi throat;
• and
• a cam control mechanism comprising a cam set, a throttle valve set, and a connecting mechanism, wherein the cam set is pivotally installed at the upper inlet end of the base, and a cam surface of the cam set abuts upon a top surface of the conical body of the variable venturi assembly, wherein the throttle valve set is pivotally installed at the lower outlet end of the base, and the throttle valve set comprises a throttle valve for controlling the open/close of the lower outlet end, and wherein the connecting mechanism has one end connected to the cam set and another end connected to the throttle valve set.