High-pressure piston pump for internal combustion engine, comprises a holding mechanism, which is radially centered through the cylinder bushing

摘要

The high-pressure piston pump (16) comprises a holding mechanism (79) which is radially centered through the cylinder bushing. The holding mechanism and/or cylinder bushing may have an axial or a helical groove (80) on their outer shells. The groove connects a ring chamber (72), in which the seal is at least partially received, to a low pressure section (82).