公开(公告)号：US20240151199A1

公开(公告)日：2024-05-09

申请号：US18281013

申请日：2022-02-02

Applicant: Hitachi Astemo, Ltd.

Inventor： Takatoshi IIZUKA ,  Takao MIYAKE ,  Masashi SUGAYA

IPC: F02M61/18 ,  F02M45/08

CPC classification number: F02M61/1806 ,  F02M45/08

Abstract: A fuel injection device includes a nozzle holder; a fixed core; an anchor; and a valve member. The valve member has a plunger rod and a spacer. The plunger rod is provided with a shaft portion, and an engaging portion that engages with the anchor during a valve opening operation. The spacer has an accommodating portion in which the engaging portion is accommodated and forms a predetermined gap between the engaging portion and the anchor when the valve is closed. Further, the accommodating portion and the engaging portion are in line contact or point contact.

公开(公告)号：US20230228238A1

公开(公告)日：2023-07-20

申请号：US18009633

申请日：2021-02-05

Applicant: Hitachi Astemo, Ltd.

Inventor： Ryohei MATSUTAKE ,  Kenichi GUNJI ,  Masashi SUGAYA

IPC: F02M61/10 ,  F02M51/06 ,  F02M61/16

CPC classification number: F02M61/10 ,  F02M51/06 ,  F02M61/161

Abstract: Provided is a prestroke adjustment method for a fuel injection valve capable of reducing variations in a prestroke amount regardless of the level of machining accuracy of a component. The prestroke adjustment method adjusts a prestroke amount D2 of a fuel injection valve 1 including a gap forming member 50 that forms a gap G2 defining a prestroke between a valve member 30 and engagement portions 33a and 423a of a movable core 42 by a second portion 52a abutting on the movable core 42 in a state where a first portion 51a is positioned at a reference position 33b of the valve member 30. In the prestroke adjustment method, a load L in the direction from the first portion 51a toward the reference position 33b of the valve member 30 is applied to the gap forming member 50 assembled to the valve member 30 to plastically deform the gap forming member 50, thereby shortening the relative length between the first portion 51a and the second portion 52a and setting the prestroke amount D2 to the target value T2.

公开(公告)号：US20230250889A1

公开(公告)日：2023-08-10

申请号：US18011675

申请日：2021-05-19

Applicant: Hitachi Astemo, Ltd.

Inventor： Masashi SUGAYA ,  Takao MIYAKE ,  Taisuke SUGII ,  Takuya WATAI

IPC: F16K31/06 ,  F02M51/06

CPC classification number: F16K31/06 ,  F02M51/06

Abstract: To provide a fuel injection device capable of improving waterproof performance of the coil portion. A fuel injection device 1 includes a coil bobbin 51 disposed in a housing 70 and having a bobbin outer peripheral surface 51a that holds a coil 50 and a bobbin inner peripheral surface 51b that is a surface on an opposite side of the bobbin outer peripheral surface 51a, and a first outer peripheral surface 46a and a first outer peripheral surface 10b (guide portion) that come into contact with the bobbin inner peripheral surface 51b. A first space S1 and a second space S2 (internal space) are formed by the first outer peripheral surface 46a and the first outer peripheral surface 10b, and the bobbin inner peripheral surface 51b, and the first space S1 and the second space S2 communicate with a space filled with the connecting portion 80.

公开(公告)号：US20230193868A1

公开(公告)日：2023-06-22

申请号：US18007592

申请日：2021-05-13

Applicant: Hitachi Astemo, Ltd.

Inventor： Takuya WATAI ,  Takao MIYAKE ,  Taisuke SUGII ,  Masashi SUGAYA

IPC: F02M61/18

CPC classification number: F02M61/188 ,  F02M61/182

Abstract: A fuel injection device includes a nozzle element, an injection hole forming member, and a valve element. The injection hole forming member includes a seat part having the seat surface, and a suck chamber formed on a front end part of the seat part, the suck chamber being a recess denting in the direction of heading from the seat surface toward a front end part. The suck chamber has a suck chamber injection hole from which a fuel is jetted toward the ignition plug.