Patent ID: 6823671
Filing Date: 2004-11-30
Classification: F02B

Abstract:
A free-piston unit for converting fuel into hydraulic energy by displacing fluid from a first fluid source which is at a first, low pressure to a second fluid source which is at a second, high pressure, comprising a combustion part, a hydraulic part and a control unit, the combustion part comprising a first cylinder with a combustion piston and a combustion space the volume of which becomes smaller during a compression stroke and becomes larger during an expansion stroke, a fuel-supply system for supplying fuel, the hydraulic part comprising a plunger which is coupled to the combustion piston and can move in at least one cylinder thus forming one or more pressure chambers on which fluid which is present in the pressure chamber(s) during the compression stroke and during the expansion stroke, exerts a force directed toward the combustion space, characterized in that adjustable pressure conversion means for setting a third pressure for fluid which is to be displaced via the pressure chamber from the first fluid source to the second fluid source.