Pump plunger rotating device for plunger-type fuel injection

Claim 1

A fuel injection pump comprising: a pump plunger having an obliquely inclined top for varying the quantity of fuel delivered by rotation of said plunger about a longitudinal axis thereof; a control rod movable substantially perpendicularly with respect to the longitudinal axis of the pump plunger in response to the engine load; a cotter disposed through the pump plunger with its longitudinal axis being substantially at a right angle to the longitudinal axis of said pump plunger; an axial pin fixedly attached to the control rod and intersecting the control rod substantially at a right angle thereto; and a cylindrical guide bush including first means for movably supporting said cotter and second means for movably supporting said axial pin, whereby movement of said guide bush and said cotter and thereby rotate said pump plunger about its longitudinal axis, said plunger being enclosed in a cylinder, said inclined top surface cooperating with port means in said cylinder in order to vary the quantity of fuel delivered as a function the plunger's position about its longitudinal axis, said first means slidably supports said cotter along the longitudinal axis of the cotter, and said second means rotatably supports said axial pin, said first means includes a guide surface in the shape of a slot extending along the diametrical direction of said guide bush, an additional slot in said guide bush extending in a direction parallel to the longitudinal axis of said plunger, said diametrical and additional slots cooperating for allowing said guide bush to move along the longitudinal axis of said cotter, and said second means includes an annular supporting surface formed in the shape of opening in a tang extending from said guide bush for rotatably supporting said axial pin.