Exhaust gas recirculating device

An exhaust gas recirculating device of an engine communicating with a suction manifold and having an exhaust pipe and having a carburetor and an exhaust gas recirculating passage leading from the exhaust pipe, comprising:

• a throttle valve mounted in the carburetor,
• two valves comprising an exhaust gas recirculating EGR valve and a variable throttle valve, both of said two valves being disposed in the exhaust gas recirculating passage leading from the exhaust pipe of the engine, said exhaust gas recirculating passage leads to downstream of the throttle valve in the carburetor,
• said carburetor includes a carburetor flange,
• an insulator,
• a variable throttle valve body is secured said carburetor flange together with said insulator,
• a regulator means for being actuated by negative pressure downstream of the throttle valve of the carburetor for operating said EGR valve,
• said carburetor forms an air horn defining a suction air passage,
• said regulator means being formed integrally with said air horn of said carburetor, said air horn is formed with a bore forming a small air passage connecting said regulator means with said suction air passage of the air horn;
• link means interconnecting said throttle valve and said variable throttle valve for keeping constant the ratio of the opening area between said throttle valve and said variable throttle valve and for controling the pressure difference between front and rear sides of the variable throttle valve to reduce Nox;
• and
• said carburetor flange being formed with a groove on an underside of the carburetor flange,
• a plate interposed between said carburetor flange and the suction manifold, said groove and said plate both cooperatively forming a portion of the exhaust gas recirculating passage and an exhaust gas delivery port opening into the suction manifold.