公开(公告)号：US20240151198A1

公开(公告)日：2024-05-09

申请号：US18281030

申请日：2022-02-02

Applicant: Hitachi Astemo, Ltd.

Inventor： Moritsugu AKIYAMA ,  Shigehiko OMATA ,  Atsushi TAKAOKU ,  Satoshi USUI ,  Minoru HASHIDA

IPC: F02M59/46 ,  F02M63/00

CPC classification number: F02M59/464 ,  F02M63/005

Abstract: The present invention provides a fuel pump capable of preventing the occurrence of cavitation near a seat member in a valve mechanism. The fuel pump includes a plunger adapted to reciprocate, a pressurizing chamber adapted to increase and decrease its volumetric capacity through the reciprocation of the plunger, and a relief valve mechanism adapted to return a fuel to the pressurizing chamber. The relief valve mechanism includes a relief valve, and a seat member having a valve contact portion for seating the relief valve thereon. The relief valve is disposed closer to the plunger than the seat member. The seat member has an annular groove portion which forms a space communicating with the pressurizing chamber, between the annular groove portion and a second chamber (a fixing portion) surrounding the outer peripheral surface of the seat member. The space is provided at a position farther from the plunger than the valve contact portion.

公开(公告)号：US20230003215A1

公开(公告)日：2023-01-05

申请号：US17777682

申请日：2020-10-30

Applicant: Hitachi Astemo, Ltd.

Inventor： Shingo TAMURA ,  Hiroyuki YAMADA ,  Kiyotaka OGURA ,  Minoru HASHIDA

IPC: F04B53/10 ,  F16K31/06 ,  F16K27/02

Abstract: An object of the present invention is to secure a gap between a component on a suction valve side and a component on an anchor side when a valve is closed, regardless of an integration tolerance of a plurality of components, and to be able to reliably close the valve. In an electromagnetic valve mechanism 300 including an anchor assembly 36 and a magnetic core 33 between which a magnetic attraction force acts, and a suction valve 30 configured to be able to come into and out of contact with the anchor assembly 36, the anchor assembly 36 includes a first anchor assembly component 36a having a facing surface 36ab that faces the magnetic core 33, a second anchor assembly component 36b configured integrally with the first anchor assembly component 36a, and a press-fitting portion 36c that fixes the first anchor assembly component 36a and the second anchor assembly component 36b. A press-fitting length L1 of the press-fitting portion 36c is set to a length at which the second anchor assembly component 36b and the suction valve 30 are separated from each other in a state where the suction valve 30 is closed.

公开(公告)号：US20230407828A1

公开(公告)日：2023-12-21

申请号：US18035384

申请日：2021-08-30

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi USUI ,  Minoru HASHIDA

IPC: F02M55/04 ,  F02M59/46

CPC classification number: F02M55/04 ,  F02M59/46 ,  F02M2200/315

Abstract: A fuel pump includes a damper, a suction valve chamber, a pressurization chamber, a relief valve chamber, a relief valve mechanism, and a shock wave absorber. The shock wave absorber is provided in the relief valve chamber, and is disposed to face the relief valve holder on the downstream side in the direction in which the relief valve holder moves when the relief valve mechanism is released.

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.

公开(公告)号：US20240003322A1

公开(公告)日：2024-01-04

申请号：US18037538

申请日：2021-08-30

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi USUI ,  Minoru HASHIDA

IPC: F02M59/44 ,  F04B53/16

CPC classification number: F02M59/442 ,  F04B53/16

Abstract: The present invention provides a fuel pump capable of discharging fuel at high pressure and suppressing sticking between a plunger and a cylinder. A high-pressure fuel supply pump includes a plunger that reciprocates, a cylinder in which a guide hole for guiding a reciprocating motion of the plunger extends in an axial direction, and a pump body including a third room (cylinder insertion hole) into which the cylinder is press-fitted, and a pressurizing chamber that communicates with the third room and has a volume increased or decreased by the reciprocating motion of the plunger. The pressure of a fixed gap generated between the cylinder and the pump body is set to be equal to or higher than pressure of a sliding gap generated between the plunger and the cylinder.