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A fuel injector that contains no springs and is controlled by a valve assembly that has more than two modes of operation. The fuel injector includes a housing which has a supply port, a drain port and a cylinder passage that is in fluid communication with an intensifier. The intensifier moves betwee

A fuel injector that contains no springs and is controlled by a valve assembly that has more than two modes of operation. The fuel injector includes a housing which has a supply port, a drain port and a cylinder passage that is in fluid communication with an intensifier. The intensifier moves between a first position and a second position within a fuel chamber. The fuel chamber is coupled to a fuel port. Movement of the intensifier into the second position pressurizes the fuel within the fuel chamber. The pressurized fuel opens a needle valve so that fuel is ejected through an aperture of the housing. The cylinder passage is coupled to a first fluid control valve and a second fluid control valve. Each control valve can be actuated between a closed position and an open position. When the first control valve is moved to the open position the supply port is in fluid communication with the cylinder passage so that a fluid flows through the passage to push the intensifier to the second position and eject fuel from the ejector. When the second control valve is actuated to the open position the cylinder passage is coupled to the drain port. The intensifier is coupled to a supply line that provides fluid to move the intensifier back to the first position. The needle valve is also coupled to the return line to move the needle back to a closed position.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel injector that ejects a fuel, comprising:a housing that has a first supply port, a drain port and a cylinder passage;an intensifier that is coupled to said cylinder passage, said intensifier can move from a first position to a second position to eject a fuel;a first

[ What is claimed is:] [1.] A fuel injector that ejects a fuel, comprising:a housing that has a first supply port, a drain port and a cylinder passage;an intensifier that is coupled to said cylinder passage, said intensifier can move from a first position to a second position to eject a fuel;a first fluid control valve that can be actuated between a closed position and an open position, wherein said first fluid control valve provides fluid communication between said first supply port and said cylinder passage in said open position, so that said intensifier moves from the first position to the second position; and,a second fluid control valve that can be actuated between a closed position and an open position, wherein said second fluid control valve provides fluid communication between said cylinder passage and said drain port through said first control valve when in said open position, so that said intensifier moves from the second position to the first position, said first fluid control valve can provide fluid communication between said first supply port and said cylinder passage without flow through said second fluid control valve.