Sealing in fuel injection pumps

Details Sealing in fuel injection pumps Sealing in fuel injection pumps

F - Mech Eng,Light,Heat,Weapons

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F02M 59/02 (2006.01) F02M 59/36 (2006.01) F02M 59/44 (2006.01)

Patent

CA 1040497

ABSTRACT OF THE DISCLOSURE The walls of the plunger (piston) of the fuel meter- ing pump are relatively thin so that, when pressurized, they expand to provide more effective sealing. A plug is then used in the bore of the plunger to reduce its volume. In one em- bodiment the wall thickness in the portion of the plunger be- tween the valving openings is further reduced to increase the wall expansion, and thus sealing, adjacent the valving openings. In some embodiments, ends of the members about the plunger are provided with skirts to decrease their tendency to expand, thus improving the sealing.

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