Patent ID: 8668156
Filing Date: 2014-03-11
Classification: F02M

Abstract:
1. A direct injection injector for an engine, comprising: a straight needle having a hole in the needle and a nose at an end of the needle; a body having a space that allows the needle to slide linearly in the space; and a cylinder nozzle inserted between an inner surface of the body and an outer side of the needle; wherein the cylinder nozzle is fitted on a portion of the needle toward the nose, and has a nozzle hole in fluid communication with the hole of the needle; wherein the needle includes a depression recessed inwardly from an outer circumference of the needle at the portion on which the cylinder nozzle is fitted, thereby forming a middle chamber with an inner side of the cylinder nozzle; wherein the needle further includes a plurality of depressed grooves formed at the portion on which the cylinder nozzle is fitted and the plurality of depressed grooves are in fluid communication with the hole of the needle; and wherein the nose of the needle is formed in a conical shape with a diameter that is larger than an outer diameter of the cylinder nozzle and gradually increasing toward the outside of the injector, such that the nose of the needle is in surface contact with an end of the body in a cone shape when the needle moves into the space of the body.