Patent ID: 8627801

Claim:
A structural assembly for a high pressure fuel pump of a quality and quantity regulated internal combustion engine, said structural assembly comprising a tappet connected to a pump piston, the tappet comprises on an outer side of a bottom, a running surface for a periodical stroke producer, the pump piston bearing frontally against a contact surface of an inner side of the bottom of the piston pump, the bottom being connected at an outer edge to a guide skirt of the tappet, an outer peripheral wall of the pump piston being surrounded near the inner side with radial lash by a bore of a spring plate having a bottom-distal side on which a coil compression spring bears for resetting the pump piston, and a bottom side of the spring plate is situated opposite an annular surface of an entraining collar on the pump piston, the entraining collar is a separate, disk-like element seated on the pump piston with slight axial distance to the spring plate, the spring plate includes a disk section with the bottom side comprising the bore, a concentric bushing projects from an outer edge of the disk section in a direction of the bottom and surrounds the entraining collar with radial lash, the bushing merges into an annular collar section that comprises the bottom-distal side that supports the coil compression spring and is supported directly on the inner side of the bottom, and the outer peripheral wall of the pump piston is free of radial collars and is finely machined by centerless grinding or centerless external cylindrical honing.