Injection volume measuring device, useful for simulation testing of internal combustion engine fuel injection, has an annular measuring piston of thermally expandable temperature resistant plastic

摘要

An injection volume measuring device, comprising a measuring piston sleeve (4) of thermally expandable temperature resistant plastic, is new. An injection volume measuring device, in which a nozzle injects a medium at high pressure into a measuring chamber sealed by a gas pressurized seal-free measuring piston guided in a measuring cylinder, has a piston (4) which, at least in the region of a sealing zone (17), consists of an annular body of thermally expandable temperature resistant plastic having an initial diameter smaller than the surrounding cylinder diameter. The piston thermally expands to a sealing diameter corresponding to the cylinder diameter and, in the expanded state, is fixed by a pre-stressed splaying body (18) which follows the increasing piston sleeve inside diameter and maintains the sealing diameter by radial support.