INTERNAL COMBUSTION ENGINE FUEL INJECTION NOZZLE Russian patent published in 1998 - IPC

FIELD: mechanical engineering; internal combustion engines; preliminary and main injection of fuel. SUBSTANCE: nozzle for preliminary and main injection of fuel has housing 10 with concentrically fitted-in two lock springs 11, 12. One of springs constantly acts onto valve needle 16 through central pressure bolt 28, and the other acts onto valve needle through pressure ring 33 enclosing the pressure bolt only after execution of preliminary travel (hv). Delivery intermediate link 40 is placed between valve needle 16 at one side and pressure bolt 28 and pressure ring 33 at other side. Link is made in form of disk whose outer edge zone comes in contact with pressure ring 33 only after preliminary travel (hv) of valve needle 16. With valve needle 16 in closed position pressure ring 33 is supported by projection 34 of washer 14. Overlapping channels are provided in delivery intermediate link 40 to prevent disconnection of connection between low pressure chamber at side of valve needle 16 and spring chamber 25 relieved from pressure in preliminary travel position when delivery intermediate link 40 adjoins axially pressure ring 33 resting on projection 34 of washer 14. EFFECT: quick locking of valve needle. 5 cl, 11 dwg