Charge forming method and apparatus with overspeed governor

Abstract

The invention disclosed embraces a charge forming method of and apparatus embodying an instrumentality responsive to engine vibrations or disturbances brought into operation when the engine reaches a predetermined speed to automatically deliver excess fuel to the engine thereby momentarily providing a nonignitible mixture preventing overspeeding of the engine.

We claim: .[.1. A valve unit of the character disclosed including, in combination, a cylindrically-shaped housing having a bore therein defining a chamber, a ball-shaped valve member disposed for relative movement in the chamber, a seat for the valve member shaped to define a fuel port, spring means in the housing normally biasing the valve member to port-closing position, said spring means being the sole force biasing the valve member to port-closing position, passage means opening into the chamber for admitting fuel from a supply into the chamber, the mass of the valve member and the pressure of the spring means being calibrated to be responsive to a predetermined frequency of vibration to effect movement of the valve member at said frequency away from port-closing position to 
     
        permit fuel flow through said port..]. 2. The combination according to claim .[.1.]. .Iadd.8 .Iaddend.including an adjustable abutment element in 
     
     
        said housing engaging the spring means. 3. The combination according to claim 2 wherein the abutment element has threaded engagement with the 
     
     
        housing for adjusting the relative position of the element. 4. The combination according to claim 2 including a closure for the end of the 
     
     
        bore in the housing adjacent the adjustable abutment. 5. The combination of claim 4 wherein the closure is a cap frictionally engaging an exterior 
     
     
        surface region of the housing. 6. The combination according to claim .[.1.]. .Iadd.8 .Iaddend.wherein the seat for the valve member has a 
     
     
        frusto-conically shaped surface for engagement with the valve member. 7. The combination according to claim .[.1.]. .Iadd.8 .Iaddend.wherein the seat for the valve member is of annular shape, and a circular recess in an end region of the housing, said annularly-shaped seat being snugly disposed in said circular recess. .Iadd. 8. An overspeed governing valve assembly for an internal combustion engine, which valve assembly is responsive to engine vibrations to introduce additional fuel into the engine for engine speed control, and which assembly includes, in combination, a cylindrically-shaped housing defining a first chamber, a ball-shaped valve member in said chamber disposed for relative movement therein in either a transverse or lengthwise direction regardless of the housing position with respect to the engine, said housing defining a seat for the valve member, which seat defines a fuel port, spring means in the housing normally biasing the valve member to port-closing position, said housing defining a fuel chamber and a mixing passage, operation of the engine developing a pressure differential between the pressures in the fuel chamber and mixing passage, both of which pressures are below atmospheric pressure, said spring means in cooperation with said pressure differential combining to bias said ball-shaped valve member to the port-closing position, and said housing defining a fuel passage opening into the first chamber for admitting fuel into the first chamber, the mass of the valve member and the pressure of the spring means being calibrated to be responsive to a predetermined frequency of engine vibration to effect movement of the valve member at said predetermined frequency away from the port-closing position to permit fuel flow through said fuel port. .Iaddend.