Piston pump

The invention relates to a piston pump (10), in particular a high-pressure fuel pump, comprising a pump housing (16), a pump piston (20), a housing-side guide section (18) in which the pump piston (20) is guided, and at least one first sealing device (38) which seals the pump piston (20) from the guide section (18), the sealing device (38) comprising at least one sealing ring (40) which is arranged in the housing-side guide section (18) and which seals the pump piston (20) from the guide section (18). The sealing ring is arranged in a circumferential groove (30) in the pump piston (20). According to the invention, the sealing device (38) comprises a preloading device (50), which loads the sealing ring (40) against a side wall (36) of the groove (30). 一种活塞泵(10)、尤其是高压燃料泵，其包括泵壳体(16)、泵活塞(20)、壳体侧的引导区段(18)和至少一个第一密封装置(38)，所述泵活塞(20)在所述引导区段中受引导，所述第一密封装置将所述泵活塞(20)相对于所述引导区段(18)密封，其中，所述密封装置(38)包括至少一个密封环(40)，所述密封环布置在所述泵活塞(20)中的环绕的槽(30)中。提出，所述密封装置(38)包括预紧装置(50)，所述预紧装置将所述密封环(40)以抵靠所述槽(30)的侧壁(36)的方式加载。