公开(公告)号：JP2006070814A

公开(公告)日：2006-03-16

申请号：JP2004255499

申请日：2004-09-02

Applicant: Denso Corp ,  Nippon Soken Inc ,  株式会社デンソー ,  株式会社日本自動車部品総合研究所

Inventor： KOIE KAZUTOSHI ,  NOMURA SHIGEO ,  OKAJIMA MASAHIRO ,  MIYOSHI SHINJI ,  GOTO MORIYASU ,  TOMITA HIROKUNI ,  MASUDA MAKOTO

IPC: F02M61/18 ,  F02M61/10

Abstract: PROBLEM TO BE SOLVED: To provide a fuel injection nozzle 1 capable of preventing leak of fuel from a second injection hole 8 at a time of low lift of a needle 3 and reducing dead volume in a suck chamber 9.
SOLUTION: A projection end part 14 entering the suck chamber 9 of a nozzle body 2 is provided on a tip part of the needle 3, and a recess groove 14a is formed on an outer circumference surface of the projection end part 14. A valve member 4 is provided in a space formed between an inner circumference surface of the suck chamber 9 and the recess groove 14a, and is arranged close to an inlet of the second injection hole 8. Negative pressure is generated when fuel of high speed passes through a narrow gap between the valve element 4 and the second injection hole 8 at a time of low lift of the needle 3 and the negative pressure acts as force pulling the valve member 4 to the inlet of the second injection hole 8. Consequently, since the valve member 4 is pressed against the inlet of the second injection hole by pressure difference acting on the valve member 4 when the valve element 4 closes the inlet of the second injection hole 8, the inlet of the valve member 4 of the second injection hole 8 is surely closed by the valve member 4.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种燃料喷射喷嘴1，其能够在针3的低升程时防止来自第二喷射孔8的燃料泄漏并减少吸入室9中的死体积。 解决方案：在针3的前端部设有进入喷嘴体2的吸入室9的突出端部14，在突出端部14的外周面形成有凹槽14a。阀构件 4设置在吸入室9的内周面和凹槽14a之间形成的空间中，并且配置在靠近第二喷射孔8的入口的位置。当高速燃料通过狭窄状态时，产生负压 在针3的低升程时阀元件4和第二喷射孔8之间的间隙作为将阀构件4吸引到第二喷射孔8的入口的力的作用力。因此，由于阀构件 4压入入口o 当阀元件4关闭第二喷射孔8的入口时，通过作用在阀构件4上的压力差的第二喷射孔，第二喷射孔8的阀构件4的入口被阀构件4确实地封闭 （C）2006年，JPO＆NCIPI

公开(公告)号：JP2004211677A

公开(公告)日：2004-07-29

申请号：JP2003123621

申请日：2003-04-28

Applicant: Denso Corp ,  株式会社デンソー

Inventor： OKAJIMA MASAHIRO ,  SHIBATA HITOSHI ,  SUGIURA SHINJI ,  OGUMA YOSHITOMO ,  YAMAMOTO KAZUO

IPC: F02M55/02 ,  F02M61/14

CPC classification number: F02M55/025 ,  F02M61/14

Abstract: PROBLEM TO BE SOLVED: To provide a fuel supply device capable of being easily and firmly assembled on a cylinder head of an engine.
SOLUTION: A clearance between a fuel transport pipe 20 and the cylinder head 2 of the engine into which a fuel injector 30 is inserted at its fuel inlet end 30a and at its fuel outlet end 30b, respectively, is restricted by restricting means 4, 26. A thrust member 40 held between the fuel transport pipe 20 and the cylinder head 2 for receiving the restricting force of the restricting means 4, 26 thrusts the fuel transport pipe 20 to the opposite side to the cylinder head 2 and the fuel injector 30 to the side of the cylinder head 2 with the reaction against the restricting force.
COPYRIGHT: (C)2004,JPO&NCIPI

公开(公告)号：JP2003148280A

公开(公告)日：2003-05-21

申请号：JP2001341538

申请日：2001-11-07

Applicant: DENSO CORP

Inventor： KANO HIROYUKI ,  OKAJIMA MASAHIRO

IPC: F02M51/06 ,  F02M61/16

Abstract: PROBLEM TO BE SOLVED: To provide a fuel injection device capable of restricting the valve opening bounce of a valve member. SOLUTION: This fuel injection device is provided with a cylindrical movable core 14 housed in a valve body 11 freely to be moved for reciprocation integrally with the valve member and a cylindrical fixed core 12 having one end facing to one end of the movable core 14 in its downstream and having an outer peripheral wall tightly brought in contact with the inner peripheral wall of the valve body 11. The end 15 of the movable core 14 opposite to the fixed core 12 is formed with an annular projecting part 50 projected toward the fixed core 12 in the peripheral side of a cylindrical hole 54 and continued to the cylindrical hole 54 and a recessed part 52 more recessed than the projecting part 50 in the outer peripheral side of the projecting part 50 and continued to the outer peripheral wall of the opposite end 15. The distance dc of a clearance between the outer peripheral wall of the opposite end 15 and the inner peripheral wall of the valve body 11 is set at 15-25 μm.

公开(公告)号：JP2003106236A

公开(公告)日：2003-04-09

申请号：JP2001297580

申请日：2001-09-27

Applicant: DENSO CORP

Inventor： OKAJIMA MASAHIRO ,  OGUMA YOSHITOMO

IPC: F02M51/06

Abstract: PROBLEM TO BE SOLVED: To provide an electromagnetic fuel injection valve capable of inhibiting the generation of open valve bounce without impairing the responding characteristic in rising and lowering of a valve element, and reducing the variation of the fuel injection quantity. SOLUTION: In this fuel injection valve 1 having a pipe 21, a fixed core 22, a movable core 23, a solenoid coil 24 and a needle valve 31, at least one of both toric end faces opposite to each other of the fixed core and the movable core is provided with an inner toric projection 239 and an outer toric projection 230 respectively at a center side and a centrifugal side through a radial central part. A speed in collision of the movable core with the fixed core is reduced by hydraulic damper action of an area defined by the inner toric projection, the outer toric projection, the movable core end face and the fixed core end face which can be raised when the movable core is sucked, whereby the open valve bounce can be inhibited.

公开(公告)号：JP2001263141A

公开(公告)日：2001-09-26

申请号：JP2000072375

申请日：2000-03-15

Applicant: DENSO CORP

Inventor： OKAJIMA MASAHIRO

IPC: F02M51/06 ,  F02D41/20 ,  F16K31/06

Abstract: PROBLEM TO BE SOLVED: To reduce operating sound when a needle valve (valve element) is opened and driven and to suppress generation of secondary injection. SOLUTION: A current-carrying period to a second coil part 42 for driving a needle valve 21 of an injector (fuel injection valve) 10 in a valve closing direction is overlapped before termination of a current-carrying period to a first coil part 31 for driving the needle valve 21 in a valve opening direction and current-carrying to the second coil part 42 is stopped just before seating. As a result, valve closing responsiveness of the needle valve 21 can be improved and operating sound at the time of seating is reduced. Facing area with abutted movable core 22 and a second fixed core 41 and flow passage area of fuel in the vicinity of the downstream is set so as to be a fuel compressed state in a seating direction to the valve seat 12 of the needle valve 21, a hydraulic damper effect is obtained in the fuel compressed state and secondary injection from a nozzle hole part 13 to an internal combustion engine is suppressed.

公开(公告)号：JP2001165014A

公开(公告)日：2001-06-19

申请号：JP34755599

申请日：1999-12-07

Applicant: DENSO CORP

Inventor： OKAJIMA MASAHIRO ,  ASAI SATORU

IPC: F02M51/06 ,  F02M47/00 ,  F02M51/00

Abstract: PROBLEM TO BE SOLVED: To provide a fuel injection device having high valve closing responsiveness at low costs. SOLUTION: When a valve opening driving pulse is turned on by a command of an ECU, current-carrying is carried out to a first coil part 31, a movable core 22 is attracted by a first fixed core 31, and a nozzle needle 21 is separated from a valve seat 13, and then, a valve is opened. When a valve closing driving pulse is turned on before a time TX than the valve closing driving pulse is turned on, current-carrying is carried out to a second coil part 42, and then, force for attracting the movable core 22 by the second fixed core 41 is generated. After valve closing is started, energizing force of a valve closing direction is rapidly increased, time delay from a time when valve closing is started to a time when the valve closing is completed, is suppressed, and thereby, valve closing responsiveness is improved.

公开(公告)号：JPH09189276A

公开(公告)日：1997-07-22

申请号：JP210696

申请日：1996-01-10

Applicant: DENSO CORP

Inventor： OKAJIMA MASAHIRO ,  DATE KENJI

IPC: F02M45/08 ,  F02M61/10

Abstract: PROBLEM TO BE SOLVED: To provide a fuel injector which reduces harmful matter discharged in exhaust gas. SOLUTION: Fuel sent out from a high pressure fuel pump is led to flow from a passing hole 43 into a fuel pass 50. When fuel pressure in the fuel pass 50 becomes a first pressure value P1 or more, a small diametral cylindrical part 22 is elastically deformed on a diametral outside so as to form a first clearance in a first blocked part 51, and fuel injection from this first clearance is started. When fuel pressure in the fuel pass 50 becomes a second pressure value P2 or more which is larger than the first pressure value P1, a cylindrical part 32 is elastically deformed on a diametral outside so as to form a second clearance in a second blocked part 51, and fuel injection from the second clearance is started in addition to the fuel injection from the first clearance. Two- stage injection from the first and second clearances is thusly executed so that an initial injection rate can be suppressed, and an NOx can be reduced. The fuel injection from the first clearance is executed when only the fuel pressure becomes the first pressure value P1 or more, therefore, fuel can be atomized, and occurrence of a smoke can be suppressed.

公开(公告)号：JPH0949470A

公开(公告)日：1997-02-18

申请号：JP20229795

申请日：1995-08-08

Applicant: DENSO CORP

Inventor： DATE KENJI ,  KATO MASAAKI ,  KANO HIROYUKI ,  OKAJIMA MASAHIRO

IPC: F02M61/18

Abstract: PROBLEM TO BE SOLVED: To reduce a harmful substance discharged into exhaust gas and improve fuel consumption. SOLUTION: A sliding hole 40, having an internal diameter capable of sliding the second columnar part 38 of a needle 30 to be inserted through a nozzle body 18, is formed in a tip end of a seat part 28 positioned in an end part of the nozzle body 18. When an internal wall 28a of this sliding hole 40 is ground, by grinding the hole from its opening side before closed by a sack plug 20, grinding accuracy of the internal wall 28a can be improved. In this way, a clearance between the second columnar part 38 and the sliding hole 40 can be controlled to a degree of several μm, and when the second columnar part 38 is brought into sliding contact with the sliding hole 40, high pressure fuel, leaking from a guide hole 27 which is in the upstream of fuel into the sliding hole 40 which is in the downstream of fuel, can be prevented.

公开(公告)号：JP2014095307A

公开(公告)日：2014-05-22

申请号：JP2012245935

申请日：2012-11-08

Applicant: Denso Corp ,  株式会社デンソー

Inventor： OKAJIMA MASAHIRO

IPC: F02M21/02

CPC classification number: Y02T10/32

Abstract: PROBLEM TO BE SOLVED: To properly burn a gas fuel in a combustion chamber while suppressing a problem such that equipment is excessively complicated.SOLUTION: In an engine 10, a gas fuel of a composition including a hydrogen atom is introduced into a combustion chamber 25, and the gas fuel is burned by ignition spark generated by an ignition plug 26. An intake port 11a of the engine 10 is provided with a fuel injection valve 15 for injecting a gas fuel supplied for combustion in the combustion chamber 25. Further a gas dissociation device 50 dissociating the gas fuel supplied from a fuel supply source, and producing hydrogen molecules by the dissociation, is disposed at an upstream side of the fuel injection valve 15. The fuel injection valve 15 injects the gas fuel and the hydrogen molecules after the dissociation by the gas dissociation device, to the intake port 11a.

Abstract translation: 要解决的问题：适当地燃烧燃烧室中的燃气，同时抑制设备过于复杂的问题。解决方案：在发动机10中，将包含氢原子的组合物的气体燃料引入燃烧室25 并且气体燃料被火花塞26产生的点火火花燃烧。发动机10的进气口11a设置有燃料喷射阀15，用于将供给燃烧气体燃料喷射到燃烧室25中。另外，气体 解离装置50将从燃料供给源供给的气体燃料解离，通过解离而产生氢分子，配置在燃料喷射阀15的上游侧。燃料喷射阀15将气体燃料和氢分子 通过气体解离装置离解到进气口11a。

公开(公告)号：JP2014015918A

公开(公告)日：2014-01-30

申请号：JP2012155717

申请日：2012-07-11

Applicant: Denso Corp ,  株式会社デンソー

Inventor： MOTOE YUSUKE ,  TAKEDA HIDETO ,  TAKEYAMA MASAKI ,  OKAJIMA MASAHIRO ,  SUZUKI KUNINORI ,  KURIMOTO NAOKI ,  FUJINO TOMOKI

IPC: F02M43/04 ,  F02D19/06 ,  F02M21/02 ,  F02M61/10

CPC classification number: Y02T10/32 ,  Y02T10/36

Abstract: PROBLEM TO BE SOLVED: To simplify a fuel injection system capable of jetting gas fuel and liquid fuel.SOLUTION: A gas injection valve 17 includes a back pressure chamber that generates biasing force with which a first valve body is biased to a closed side by the introduction of fluid, and an energization drive part that shifts the first valve body to an open side against the biasing force in a valve-closing direction generated by the back pressure chamber in accordance with the energization. A liquid injection valve 18 operates with a rotation of an engine output shaft 41 and is mechanical drive type of shifting a second valve body to the open side at a predetermined rotational position where in-cylinder fuel is ignited. In addition, a liquid supply part for supplying high-pressure liquid fuel to the liquid injection valve 18 includes high-pressure passages (36a, 36b, and 28) connecting a high-pressure pump 35 with the liquid injection valve 18, the back pressure chamber of the gas injection valve 17 is arranged in the middle of the high-pressure passages, and the biasing force with which the first valve is biased to the closed side by high-pressure fuel is generated in the back pressure chamber.

Abstract translation: 要解决的问题：简化能够喷射气体燃料和液体燃料的燃料喷射系统。解决方案：气体喷射阀17包括产生偏压力的背压室，第一阀体通过该偏压力被偏压到闭合侧 引导流体，以及通电驱动部，其根据通电而抵抗由背压室产生的关闭方向的偏压力将第一阀体向开口侧移动。 液体喷射阀18通过发动机输出轴41的旋转而动作，并且是机械驱动型，其中第二阀体在点燃缸内燃料的预定旋转位置处向开口侧移动。 此外，用于向液体喷射阀18供给高压液体燃料的液体供给部包括将高压泵35与液体喷射阀18连接的高压通路（36a，36b，28），背压 气体注入阀17的室配置在高压通路的中间，在背压室中产生用高压燃料将第一阀偏压到封闭侧的偏压力。