Patent ID: 6889665

Claim:
A high-pressure piston pump ( 20 ) for a fuel system ( 10 ) of an internal combustion engine, comprising: a housing ( 72 ), at least one piston ( 94 ) that defines a working chamber ( 100 ), a drive shaft ( 78 ) that is supported in the housing ( 72 ) by at least one shaft bearing and has at least one crank section ( 86 ), a piston bearing that supports the piston ( 94 ) at least indirectly against the crank section ( 86 ) of the shaft ( 78 ), at least one of the bearings between parts that move in relation to one another being a hydrostatic bearing ( 62 ), and means operable to intermittently interrupt the fluid connection between the working chamber ( 100 ) and the hydrostatic bearing ( 62 ), wherein the means operable to intermittently interrupt the fluid connection includes an on-off valve ( 56 ).