| 摘要 |
The invention relates to a high-pressure pump piston/cylinder unit in which a pump cylinder (3) having a piston (2) oscillating therein is provided inside a housing (1). The piston (2) is actively connected, on one face, to a controlled drive (4) in order to vary, in the pump cylinder (3), a suction working volume and pressure working volume on the other face on the piston-head area whereby increasing the pressure of the fluid drawn out of a delivery flow supply (9) and into a pump cylinder (3) by the stroke of the piston (2) in order to render it accessible to another supply element by means of a delivery valve (8). The aim of the invention is to eliminate the risk of the piston (2) guided inside the pump cylinder (3) of wearing due to a deviation from the axis. To this end, the invention provides that a centering cone (20) provided in the form of a straight truncated cone with a circular base area (D) and top area (d) is shaped on the head area of the pump piston (2). The maximum half diameter reduction (1/2 x [D-d]) with regard to the diameter (D) of the head shaft (2) is a ratio of ca. 1: 200 and the axial length (l) thereof with regard to the axial length (L) of the entire piston shaft (2) is a ratio of (I: L) of ca. 1: 6.6.
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