Fuel injection nozzle and method of holding the same
View Patent ↗A fuel injection nozzle for directly injecting fuel into a cylinder of an internal combustion engine is inserted in a connecting pipe extending from a fuel rail and is fixed to the connecting pipe by fastening member. The fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member. The contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.
1. A fuel injection nozzle for injecting fuel directly into a cylinder of an internal combustion engine, inserted in a fuel rail and fastened to the fuel rail with a fastening member, said fuel injection nozzle having:
a sealing part for sealing a fuel passage to prevent fuel leakage; and
a contact part in contact with the fastening member;
wherein the contact part is softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.
2. The fuel injection nozzle according to claim 1 wherein the contact part is formed of a material having a tensile strength lower than that of the fastening member or a material having a hardness lower than that of the fastening member.
3. The fuel injection nozzle according to claim 1 , wherein the contact part is a protrusion capable of coming into contact with the fastening member.
4. The fuel injection nozzle according to claim 1 , wherein the contact part is a U-shaped member made of a material having a yield point lower than those of the fastening member and a fixing part of the fuel injection nozzle fixed by the fastening member, and held between the fastening member and the fixing part.
5. A fuel injection nozzle holding method of holding a fuel injection nozzle for injecting fuel directly into a cylinder of an internal combustion engine, comprising the steps of:
inserting a base end part of the fuel injection nozzle in a fuel rail; and
fastening the fuel injection nozzle to the fuel rail with a fastening member;
wherein the fuel injection nozzle has a sealing part for sealing a fuel passage to prevent fuel leakage, and a contact part in contact with the fastening member, the contact part is formed in a member softer than the fastening member, and the contact part undergoes plastic deformation when a bending moment that bends the axis of the fuel injection nozzle acts on the fuel injection nozzle.
6. The fuel injection nozzle holding method according to claim 5 , wherein the fastening member includes a fixing clip, and a holding plate held between the fixing clip and the fuel injection nozzle.