Injection nozzle for injecting lubricating oil in engine cylinders and use thereof

An injection nozzle for use in injecting lubricating oil into cylinders in engines and adapted with a mounting means for fastening in a cylinder wall, with a nozzle rod extending through the cylinder wall and with at least one nozzle outlet at an inner end of the nozzle rod, the nozzle rod including a valve with a cylindrical valve seat bore in which is provided a displaceable valve body having a cylindrical sealing surface which interacts with the cylindrical valve seat bore of the nozzle rod, the displaceable valve body having an enlarged head at an outer end of the displaceable valve body with a contact face for a spring disposed around the displaceable valve body for establishing a spring-loaded closing of the valve, the nozzle rod including a passage for pressurised oil for supplying pressurised oil to a pressure chamber in which the pressurised oil can exert a force on the displaceable valve body so that the displaceable valve body is displaced against the action of the spring for opening the valve and establishing an overpressure injection of oil through the nozzle outlet until the oil pressure drops such that the spring establishes a closing of the valve, wherein the displaceable valve body is formed by a cylindrical rod which has a turned recess in the cylindrical sealing surface of the displaceable valve body, the turned recess being arranged at an inner end of the displaceable valve body, with parts of the cylindrical sealing face of the displaceable valve body at each side of the turned recess, for being connected with the nozzle outlet at a forward displacement of the displaceable valve body towards an outlet end of the injection nozzle, against the action of the spring, to deliver the pressurized oil to the nozzle outlet, the pressure chamber of the nozzle rod being formed by a pressure chamber bore with a greater diameter than the valve seat bore for forming a pressure chamber in which the spring is located, and the pressure chamber via a pressurised oil supply duct being connected with the turned recess in the displaceable valve body.