公开(公告)号：US20150247478A1

公开(公告)日：2015-09-03

申请号：US14625939

申请日：2015-02-19

Applicant: DENSO CORPORATION

Inventor： Kazufumi SERIZAWA ,  Atsushi UTSUNOMIYA ,  Fumihiro FUJIKAKE ,  Fumiaki ARIKAWA ,  Yuuta HASHIMOTO

IPC: F02M51/06 ,  F02M61/18 ,  F02M61/04

CPC classification number: F02M51/061 ,  F02M61/04 ,  F02M61/18 ,  F02M61/1833 ,  F02M61/1846

Abstract: A fuel injector has a cylindrical nozzle body, a nozzle needle, a pressure chamber and an injection passage. The injection passage includes a first hole and a second hole. A minimum vertical distance between an outer periphery of a first nozzle hole outlet and a contact point relative to an axial center line of the first hole is defined as a vertical distance R. A minimum axial distance between the first nozzle hole outlet and the contact point relative to an axial center line of the first hole is defined as an axial distance L. An angle between the axial center line of the first nozzle hole and the outer periphery line of the fuel spray is defined as an injection angle θ. The vertical distance R, the axial distance L and the injection angle θsatisfy a formula: R/(L×tanθ)>6.0.

Abstract translation: 燃料喷射器具有圆柱形喷嘴体，喷嘴针，压力室和喷射通道。 注射通道包括第一孔和第二孔。 将第一喷嘴孔出口的外周和相对于第一孔的轴线中心线的接触点之间的最小垂直距离定义为垂直距离R.第一喷嘴孔出口与接触点之间的最小轴向距离 相对于第一孔的轴向中心线被定义为轴向距离L.将第一喷嘴孔的轴向中心线与燃料喷雾的外周线之间的角度定义为喷射角度。 垂直距离R，轴向距离L和注射角度等于满足公式：R /（L×tan＆Thetas;）> 6.0。

公开(公告)号：US20160215746A1

公开(公告)日：2016-07-28

申请号：US15001559

申请日：2016-01-20

Applicant: DENSO CORPORATION

Inventor： Kazufumi SERIZAWA ,  Shinya SANO ,  Atsushi UTSUNOMIYA

IPC: F02M61/10

CPC classification number: F02M61/10 ,  F02M61/1833 ,  F02M61/184 ,  F02M61/1846

Abstract: In an injection hole of a nozzle, a maximum value of a longitudinal length of an inlet, which is measured in a direction of an inlet longitudinal axis of the inlet, is larger than a maximum value of a longitudinal length of an outlet, which is measured in a direction of an outlet longitudinal axis of the outlet. A rear end edge of an opening edge of the inlet is shaped into an arc. When the maximum value of the inlet is made larger than the maximum value of the outlet, an upstream end of the inlet can be placed at a further upstream side, so that a turn angle of a fuel flow can be reduced to increase the flow coefficient. Furthermore, when the rear end edge is shaped into the arc, the maximum value of the inlet can be increased.

Abstract translation: 在喷嘴的喷射孔中，在入口纵向轴线方向上测量的入口的纵向长度的最大值大于出口纵向长度的最大值，即最大值 在出口的出口纵向轴线的方向上测量。 入口的开口边缘的后端边缘成形为弧形。 当入口的最大值大于出口的最大值时，入口的上游端可以放置在更上游侧，从而可以减小燃料流的转角以增加流量系数 。 此外，当后端缘成形为弧形时，可以增加入口的最大值。

公开(公告)号：US20150211460A1

公开(公告)日：2015-07-30

申请号：US14600410

申请日：2015-01-20

Applicant: DENSO CORPORATION

Inventor： Toshiaki HIJIMA ,  Fumiaki ARIKAWA ,  Motoya KANBARA ,  Yuuta HASHIMOTO ,  Atsushi UTSUNOMIYA ,  Kazufumi SERIZAWA ,  Shinya SANO

IPC: F02M61/10 ,  F02M61/18

CPC classification number: F02M61/10 ,  F02M61/18 ,  F02M61/1866 ,  F02M61/1886

Abstract: In a nozzle, in a cross section including an axis of a nozzle body, a side surface and a seat surface are both smoothly connected to an arc of a circle inscribing both the side surface and the seat surface. A part of a needle which is adjacent to a tip end side of a seat portion is a cone having a diameter reduced toward a tip end side of the cone in the axial direction. Thus, no corner is on the seat surface or the side surface, and the two surfaces form one curved surface. Since a cavitation generated in a sack chamber can be reduced, even when an injection quantity is significantly small such that an injection port does not throttle an injection flow, a flow coefficient of the injection flow is improved and a penetration of a spray of the fuel can be maintained.

Abstract translation: 在喷嘴中，在包括喷嘴体的轴线的横截面中，侧表面和座表面均平滑地连接到嵌入侧表面和座表面的圆弧。 与座部的前端侧相邻的针的一部分是沿着轴向朝锥体的前端侧减小直径的锥体。 因此，座面或侧面没有角部，两个面形成一个曲面。 由于可以减小在袋室中产生的空穴现象，所以即使喷射量非常小，使得喷射口不会阻碍喷射流动，喷射流量的流动系数也得到改善，并且喷射燃料 可以维护。

公开(公告)号：US20180180009A1

公开(公告)日：2018-06-28

申请号：US15738278

申请日：2016-06-08

Applicant: DENSO CORPORATION

Inventor： Shinya SANO ,  Kazufumi SERIZAWA ,  Atsushi UTSUNOMIYA ,  Toshiaki HIJIMA

IPC: F02M61/18

CPC classification number: F02M61/1893 ,  F02M61/1806 ,  F02M61/1826 ,  F02M61/1833 ,  F02M61/1846 ,  F02M61/1886

Abstract: A throttle portion is defined between an upper end of a sac chamber and a conical portion of a needle to have a throttle opening area S1. Half of an area surrounded by the throttle portion, the needle, an inner wall of the sac chamber, and a lower end extended line in a cross section of the sac chamber taken along a sac center line is an injection hole upstream area S2. A lift amount, when the throttle opening area S1 is equal to an area which is calculated by multiplying an injection hole area S3 by the number of the injection holes, is a predetermined lift amount L. A viscosity coefficient of fuel is ρ. An index value Sa, which is calculated in accordance with an equation as below, is set to 0.5 or greater. S a = ρ 2  ∫ h = 0 h = L  ( S 1 S 2 - S 1 ) 2   dh