公开(公告)号：US20230029119A1

公开(公告)日：2023-01-26

申请号：US17784560

申请日：2020-12-11

Applicant: HITACHI ASTEMO, LTD.

Inventor： Kenichiro TOKUO ,  Hiroyuki YAMADA ,  Kiyotaka OGURA ,  Shingo TAMURA ,  Yuto ISHIZUKA

IPC: F02M59/46 ,  F02M63/00

Abstract: Provided is a discharge valve mechanism capable of improving responsiveness when a discharge valve is opened, and a high-pressure fuel supply pump including the discharge valve mechanism.
A discharge valve mechanism 500 includes a valve seat portion 51 having a primary-side flow path, a valve body 52 which can be seated on and separated from the valve seat portion 51, and a guide portion 542a which is formed to be slidable on an outer surface of the valve body 52 and guides movement of the valve body 52 in a contacting/separating direction with respect to the valve seat portion 51. The guide portion 542a includes a portion in which a gap from the outer surface of the valve body 52 is set to a predetermined value or less. A first secondary-side flow path 545 which allows an internal space 541a on an upstream side of the guide portion 542a to communicate with an external flow path 2g is formed to allow the fluid to flow out to a side in a moving direction of the valve body 52, and a second secondary-side flow path 546 which allows an internal space 543a on a downstream side of the guide portion 542a to communicate with the external flow path 2g is formed to allow the fluid to flow out to the side in the moving direction of the valve body 52.

公开(公告)号：US20240159208A1

公开(公告)日：2024-05-16

申请号：US18280490

申请日：2022-02-02

Applicant: Hitachi Astemo, Ltd.

Inventor： Takafumi ITO ,  Kiyotaka OGURA ,  Masashi NEMOTO ,  Kenichiro TOKUO

IPC: F02M59/36 ,  F02M59/44

CPC classification number: F02M59/366 ,  F02M59/44

Abstract: The present invention suppresses wear of a rod or a component with which the rod is in contact. An electromagnetic suction valve mechanism (electromagnetic valve mechanism) includes a suction valve (valve body), a rod engaged with the suction valve, and a magnetic attraction force generation unit that generates a magnetic attraction force for moving the rod in an axial direction. The rod is provided with a low friction portion. The low friction portion is set to a friction coefficient such that a frictional force generated between the rod and the rod contact component with which the rod is in contact is smaller than a rotational propulsive force of the rod.

公开(公告)号：US20230038318A1

公开(公告)日：2023-02-09

申请号：US17790367

申请日：2020-12-25

Applicant: Hitachi Astemo, Ltd.

Inventor： Toshihiro AONO ,  Osamu MUKAIHARA ,  Kenichiro TOKUO ,  Hirotaka NAKAI ,  Kotaro OKI ,  Shunsuke ARITOMI ,  Akiyasu MIYAMOTO

IPC: F02D41/30 ,  F02D1/18 ,  F02D41/14

Abstract: Low noise control of a high-pressure fuel pump is performed by reducing noise generated by an anchor colliding with a fixing core. A control device 800 for a high-pressure fuel pump controls a suction valve that opens and closes an inflow port through which fuel flows to a pressurizing chamber by performing energization to a solenoid 205 in synchronization with a reciprocating motion of a plunger. A current energized to the solenoid 205 includes a peak current for giving a force to start closing a valve to the suction valve in a stationary state and a holding current for performing switching in a range smaller a maximum value of the peak current in order to hold the suction valve in a valve closing state. When the control device 800 reduces a peak current application amount of the peak current from a value sufficient to close the high-pressure fuel pump, a valve closing speed of the suction valve becomes small up to a certain application amount, and when the peak current application amount becomes smaller than the application amount, there is a saturation range of a current application amount of the peak current in which the valve closing speed of the suction valve is saturated. The control device 800 controls the current application amount of the peak current to fall in the saturation range.

公开(公告)号：US20220381213A1

公开(公告)日：2022-12-01

申请号：US17775778

申请日：2020-10-30

Applicant: HITACHI ASTEMO, LTD.

Inventor： Masamichi YAGAI ,  Kiyotaka OGURA ,  Shingo TAMURA ,  Yuto ISHIZUKA ,  Hiroyuki YAMADA ,  Kenichiro TOKUO ,  Minoru HASHIDA

IPC: F02M59/46

Abstract: Provided is a fuel supply pump capable of improving welding quality while securing a function of a valve body. A fuel supply pump of the present invention includes a regulating member (discharge valve stopper 84) that guides movement of a valve body (discharge valve 82), a main body portion (body 1) provided with a valve chamber (discharge valve chamber 1d) that houses the regulating member, a sealing member (plug 85) that seals the valve chamber, and a welded portion (welded portion 86) that fixes the sealing member to the main body portion. An annular space portion (annular space portion 60) along an outer periphery of the regulating member is formed between the welded portion and the regulating member. The regulating member includes a positioning portion (fitting portion 84a) for positioning with respect to the main body portion on a side opposite to the sealing member, and a gap forming portion (gap forming portion 84c) forming an annular gap (annular gap 63) between the gap forming portion and the main body portion, and the annular gap allows a space on a side of the positioning portion in the valve chamber and the annular space portion to communicate with each other.