Patent ID: 6092793
Filing Date: 2000-07-25
Classification: F02M,Y10S

Abstract:
A constant vacuum carburetor comprising:a vacuum actuated valve disposed within a vacuum actuated valve guide cylinder located on upstream side of a throttle valve in movable fashion, said vacuum actuated valve defining a first guide hole, a jet needle engaging step portion and a jet needle insertion hole;a diaphragm arranged in an upper end portion of said vacuum actuated valve for defining an atmospheric pressure chamber and a pressure receiving chamber, the inner peripheral portion of said diaphragm being clamped between a flange portion on the upper end of said vacuum actuated valve and a diaphragm plate;a vacuum actuated valve return spring disposed within said pressure receiving chamber in compressed fashion;a spring seat arranged in opposition to said pressure receiving chamber and including an inner jet needle supporting cylindrical portion inserted into said first guide hole of said vacuum actuated valve and an outer spring engaging flange portion engaging with a lower end of said vacuum actuated valve return spring, said jet needle supporting cylindrical portion of said spring seat being inserted within said first guide hole of said vacuum actuated valve; anda jet needle movement in the longitudinal direction being restricted by said jet needle engaging step portion and the end portion of said jet needle supporting cylinder portion.