Rotary fuel injection pump

Claim 1

In a rotary fuel injection pump for an internal combustion engine having a housing with inlet and outlet passages; a rotor journaled in the housing having a rotor body with a plurality of angularly spaced radially extending bores and a fuel passage in communication with the inner ends of the bores having inlet and outlet ports which communicate alternately with said inlet and outlet passages during rotation of the rotor for alternately conducting fuel to and from the bores respectively, a plunger assembly for each bore comprising a pump plunger reciprocably mounted in the bore to sequentially receive charges of fuel from and deliver them to said inlet and outlet passages respectively, and a plunger operating roller and roller shoe at the outer end of the plunger; a cam ring with an inner cam contour surrounding the rotor in the plane of revolution of the rollers and engageable therewith to translate the cam contour into reciprocable movement of the plungers; and a plunger stroke limit mechanism for limiting the outward stroke of the plungers and thereby regulate the quantity of fuel injected during each inward pumping stroke thereof; the improvement wherein the plunger stroke limit mechanism comprises a separate abutment slide for each plunger assembly reciprocably mounted on the rotor for axial adjustment adjacent and relative to the respective plunger assembly and having first abutment means for limiting the outward stroke of the plunger assembly radially adjustable relative to the respective plunger assembly upon axial adjustment of the abutment slide, each plunger assembly having second abutment means engageable with the first abutment means of the respective abutment slide to adjustably limit the outward stroke of the respective plunger in relationship to said relative radial adjustment of the first abutment means and therefore the adjusted axial position of the respective abutment slide, and control means connected to axially adjust the abutment slides equally.