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：US20220131440A1

公开(公告)日：2022-04-28

申请号：US17430555

申请日：2020-02-05

Applicant: Hitachi Astemo, Ltd.

Inventor： Atsuji SAITO ,  Satoshi USUI

IPC: H02K5/24 ,  F02M51/04

Abstract: A coil component of an electromagnetic valve is made compact to achieve both low cost and improvement in sound vibration performance. Therefore, a high-pressure fuel pump of the present invention includes: a coil 3g; a magnetic core 3e that is arranged on a side opposite to a pressurizing chamber 11 with respect to a movable core 3h and attracts the movable core 3h when the coil 3g is energized; a yoke 3q arranged on a radially outer side of the coil 3g; a cover portion 3r that covers the coil 3g from an axially outer side; and a molded portion 17 that covers a radially outer side of the yoke 3q and an axially outer side of the cover portion 3r.

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.

公开(公告)号：US20230193865A1

公开(公告)日：2023-06-22

申请号：US17927179

申请日：2021-05-19

Applicant: Hitachi Astemo, Ltd.

Inventor： Shingo TAMURA ,  Satoshi USUI ,  Kazuaki TOKUMARU

IPC: F02M59/04 ,  F02M59/44

CPC classification number: F02M59/04 ,  F02M59/44

Abstract: The present invention provides a fuel pump capable of suppressing sticking of a plunger. The fuel pump of the present invention includes a plunger 2 that reciprocates, a cylinder 6 in which a guide hole 6a that guides the reciprocating motion of the plunger 2 extends in the axial direction, and a pump body 1 that holds the cylinder 6. The pump body 1 includes a cylinder insertion hole 1g into which the cylinder 6 is inserted, and a pressurizing chamber 11 that communicates with the cylinder insertion hole 1g and has a volume increased or decreased by the reciprocating motion of the plunger 2. The cylinder 6 includes a press-fitting portion 6b press-fitted into the inner peripheral surface of the cylinder insertion hole 1g, and a groove 6d formed at a position corresponding to the press-fitting portion 6b on the inner peripheral surface of the guide hole 6a.

公开(公告)号：US20220082072A1

公开(公告)日：2022-03-17

申请号：US17423573

申请日：2020-02-05

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi USUI ,  Hiroyuki YAMADA

IPC: F02M59/46 ,  F04B53/14 ,  F04B53/10

Abstract: Provided is a metal diaphragm that can be easily processed and manufactured at low cost. Therefore, a metal diaphragm (91, 92) of the present invention is configured such that a curvature radius r1 of a first curved portion 911 located on the outermost side in the radial direction (outer side in the left-right direction in FIG. 5) is minimized among a flange portion (91a, 92a) and curved portions (911, 912) that are located on the radially inner side of the flange portion (91a, 92a) and curved from the flange portion (91a, 92a) to one side (upper side in FIG. 5).

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：US20220316470A1

公开(公告)日：2022-10-06

申请号：US17596875

申请日：2020-08-14

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi USUI ,  Hiroyuki YAMADA ,  Kiyotaka OGURA

IPC: F04B53/14 ,  F04B53/10

Abstract: Provided is a fuel pump capable of improving productivity. According to the present invention, a fuel pump includes a pump body 1, a plunger 2, an electromagnetic suction valve 3, and a relief valve 4. The plunger 2 reciprocates in a first room 1a which is a columnar space portion provided in the pump body 1. The electromagnetic suction valve 3 causes fuel to be sucked into a pressurizing chamber 11 formed by the first room 1a and the plunger 2. When the fuel pressure on the downstream side of the pressurizing chamber 11 exceeds a set value, the relief valve 4 opens, and brings the fuel back to the pressurizing chamber 11. The pump body 1 includes a second room 1b in which the relief valve 4 is disposed, and a communication hole 1e for causing the first room 1a and the second room 1b to communicate with each other. The diameter of the communication hole 1e is equal to the diameter of the first room 1a.