公开(公告)号：US10400768B2

公开(公告)日：2019-09-03

申请号：US15544345

申请日：2016-01-15

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F04C15/06 ,  F02M37/08 ,  F04C2/10 ,  F04C15/00

Abstract: A suction side end part of a suction guide passage and a discharge side end part of a discharge guide passage are opposed to each other with a gap therebetween. At a deviation angle at which contraction of a pump chamber starts, an outer peripheral part of the discharge side end part is formed along an inner tooth, and an inner peripheral part of the discharge side end part is formed along an outer tooth. A working tool that rotates and cuts circularly is moved around on a pump housing in a single continuous line to form an outline of the discharge guide passage, thereby forming the discharge guide passage. The working tool is moved around on the pump housing in a single continuous line to form an outline of the suction guide passage, thereby forming the suction guide passage.

公开(公告)号：US10024318B2

公开(公告)日：2018-07-17

申请号：US15153951

申请日：2016-05-13

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F01C1/10 ,  F04C2/08 ,  F04C18/08 ,  F03C2/08 ,  F04C15/00 ,  F04C2/10 ,  F04C15/06 ,  F02M59/14 ,  F01C21/10 ,  F04C11/00

Abstract: A fuel pump includes rotors that rotate, a pump housing that defines a rotor housing chamber that rotatably houses the rotors, and an outer circumferential side housing that includes a cylindrical portion formed in a cylindrical shape that surrounds the pump housing from an outer circumferential side and a narrowing potion having that narrows down with respect to the cylindrical portion. The fuel pump sucks fuel into the rotor housing chamber and then discharges the fuel due to the rotor rotating. A pump cover of the pump housing includes an inlet port that sucks fuel into the rotor housing chamber, and a sliding surface portion on which the rotors slide. An outer circumferential portion of the pump cover includes a joining portion joined to the narrowing portion, and a recessed portion that is recessed adjacent to the joining portion, the recessed portion allowing the outer circumferential portion to elastically deform.

公开(公告)号：US09982672B2

公开(公告)日：2018-05-29

申请号：US15154064

申请日：2016-05-13

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F01C1/10 ,  F04C2/08 ,  F04C18/08 ,  F03C2/08 ,  F04C29/00 ,  F04C2/10 ,  F04C15/00 ,  F02M37/08 ,  F04C13/00

CPC classification number: F04C29/0021 ,  F02M37/08 ,  F04C2/102 ,  F04C13/005 ,  F04C15/0061 ,  F04C15/0065 ,  F04C2210/203 ,  F04C2230/60 ,  F04C2240/30 ,  F04C2240/40

Abstract: A fuel pump includes an inner rotor, an outer rotor, a casing, and a housing. The inner rotor includes outward teeth. The outer rotor includes inward teeth geared with the outward teeth. The casing houses the inner rotor and the outer rotor, and forms a variable capacity pump chamber between the inward teeth and the outward teeth. The housing is formed in a cylindrical shape and includes a cylindrical inner portion, the casing being press fit into the cylindrical inner portion. A recessed portion is formed at a predetermined position in a circumferential direction of an outer circumferential surface of the casing, the recessed portion being recessed toward a radial direction center of the outer circumferential surface.

公开(公告)号：US09835152B2

公开(公告)日：2017-12-05

申请号：US15096630

申请日：2016-04-12

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F04B17/00 ,  F04C15/00 ,  F04C2/344 ,  F04C18/344 ,  F04C29/00 ,  F16D1/08 ,  F04C2/10 ,  F04C2/08 ,  F02M37/04

CPC classification number: F04C2/102 ,  F02M37/045 ,  F04C2/084 ,  F04C2/086 ,  F04C15/0073 ,  F04C2210/1044 ,  F04C2230/92 ,  F04C2240/30 ,  F04C2250/102

Abstract: An inner wall surface of a pump housing has a slide surface, which is opposite from a joint member and along which an inner rotor is slidable. This slide surface includes an external tooth slide surface and a main body slide surface. External teeth of the inner rotor are slidable along the external tooth slide surface, and a main body of the inner rotor is slidable along the main body slide surface. A surface roughness of the main body slide surface is higher than a surface roughness of the external tooth slide surface.

公开(公告)号：US10544764B2

公开(公告)日：2020-01-28

申请号：US16069015

申请日：2017-01-24

Applicant: DENSO CORPORATION

Inventor： Shingo Fukuoka ,  Kiyoshi Nagata ,  Hiromi Sakai ,  Yuuji Hidaka

IPC: F02M37/00 ,  F02M37/14 ,  F02D19/08 ,  F02M37/10 ,  F02D41/00 ,  F02D41/30 ,  F02M37/22 ,  G01N33/28 ,  G01N27/22 ,  F02M37/44 ,  F02M37/08

Abstract: A fuel pump has a pump function of sucking fuel in a fuel tank and discharging fuel, and a detection function of detecting a capacitance correlated to a concentration of alcohol in fuel in the fuel tank. The fuel pump includes a pump main body that is received in the fuel tank to perform the pump function, a housing electrode that covers the pump main body in the fuel tank, and an outside electrode that is located outside of the housing electrode in the fuel tank. A gap is formed between the outside electrode and the housing electrode to give the capacitance.

公开(公告)号：US10393077B2

公开(公告)日：2019-08-27

申请号：US15551661

申请日：2016-03-24

Applicant: DENSO CORPORATION

Inventor： Daiji Furuhashi ,  Hiromi Sakai

IPC: F03C2/00 ,  F03C4/00 ,  F04C2/00 ,  F04C18/00 ,  F02M37/08 ,  F02M37/10 ,  F04C2/10 ,  F04C14/10 ,  F04C15/00

Abstract: A fuel pump includes: an outer gear; an inner gear that is meshed with the outer gear and includes a receiving hole; a rotatable shaft; a contact portion that is formed to be contactable with the receiving hole; and a pump housing that rotatably receives the outer gear and the inner gear and includes a first housing component and a second housing component, between which the inner gear is held in the axial direction. At least one of the receiving hole and the contact portion includes a tilt surface, which is tilted relative to the axis direction. When the rotatable shaft is rotated to a drive rotation side, the receiving hole contacts the contact portion through the tilt surface, so that the receiving hole is urged in a circumferential direction and is also urged toward the first housing component in the axial direction.

公开(公告)号：US09890782B2

公开(公告)日：2018-02-13

申请号：US15096657

申请日：2016-04-12

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F01C21/04 ,  F03C2/00 ,  F03C4/00 ,  F04C2/00 ,  F04C2/10 ,  F04C15/00 ,  F04C15/06

CPC classification number: F04C2/102 ,  F04C15/0092 ,  F04C15/06 ,  F04C2210/1044 ,  F04C2240/50 ,  F04C2240/56 ,  F05C2253/20

Abstract: A pump housing receives an outer rotor and an inner rotor. A joint member couples between a rotatable shaft and the inner rotor to transmit a rotational torque from the rotatable shaft to the inner rotor. A radial bearing is shaped into a cylindrical tubular form. A cylindrical inner peripheral surface of the radial bearing rotatably and slidably supports the rotatable shaft. A cylindrical outer peripheral surface of the radial bearing rotatably and slidably supports an inner peripheral surface of the inner rotor. A lubrication groove is formed in the cylindrical outer peripheral surface of the radial bearing and accumulates fluid, which is present in an inside of the pump housing.

公开(公告)号：US11441522B2

公开(公告)日：2022-09-13

申请号：US16061070

申请日：2016-11-25

Applicant: DENSO CORPORATION

Inventor： Tetsuo Hayakawa ,  Hiromi Sakai ,  Daiji Furuhashi

IPC: F02M37/02 ,  F02M37/44 ,  F02M37/10 ,  F02M37/50 ,  F04C2/10 ,  F02M37/04 ,  F04C13/00 ,  B01D35/027 ,  F04C15/06 ,  F02D41/30

Abstract: A fuel pump unit includes a suction filter and a fuel pump. The fuel pump includes: a rotatable shaft placed along a rotational axis; a rotor portion that rotates in response to rotation of the rotatable shaft; a suction hole portion, through which the fuel is suctioned into an inside of a rotor receiving chamber; and an outer peripheral wall that surrounds the suction hole portion. The suction filter includes: a filter element that filters the fuel and conducts the filtered fuel into an inside space; and a columnar hole portion having an inner peripheral wall, while the outer peripheral wall and the inner peripheral wall are fitted with each other, so that the columnar hole portion communicates between the inside space and the suction hole portion. The columnar hole portion is placed such that the rotational axis extends on an inner side of the inner peripheral wall.

公开(公告)号：US10934985B2

公开(公告)日：2021-03-02

申请号：US15542758

申请日：2015-12-21

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F02M59/12 ,  F04C15/06 ,  F04C2/10 ,  F04C2/08 ,  F02M37/10 ,  F04C11/00 ,  F04C15/00

Abstract: An inner gear includes: sliding surface parts that are provided annularly at an outer peripheral part including a plurality of outer teeth on both sides of the inner gear in its axial direction and that slide on a pump housing; recessed parts that are respectively provided radially inward of the sliding surface parts to respectively form fuel chambers, into which fuel flows, between the recessed parts and the pump housing; and a communication hole that communicates between the recessed parts. The inner gear further includes an inclined surface part that is provided at an edge portion of a communicating edge portion on a rotation advance side of the inner gear, to avoid an adjacent part adjacent to an inner peripheral edge portion of each of the sliding surface parts and that is inclined further toward a rear side in a direction to a central part of the communication hole.

公开(公告)号：US10557468B2

公开(公告)日：2020-02-11

申请号：US15768592

申请日：2016-10-28

Applicant: DENSO CORPORATION

Inventor： Hiromi Sakai ,  Daiji Furuhashi

IPC: F04C2/10 ,  F04C15/06 ,  F02M37/08 ,  F04C13/00 ,  F02M37/10

Abstract: The pump housing includes a pair of sliding surfaces clamping the outer and inner gears from both their sides to allow both the gears to slide on the sliding surfaces, a suction port part suctioning fuel from outside into inside of the gear accommodation chamber, and a discharge port part discharging fuel from inside into outside of the gear accommodation chamber. At least one of the suction port part and the discharge port part includes an elongated groove that is depressed from the corresponding sliding surface and extends along a circumferential direction of the pump housing in a region opposed to the pump chambers, opening bores that open on the elongated groove from outside of the gear accommodation chamber, and ribs each of which is arranged between the corresponding adjacent two opening bores. The opening bores and the ribs are arranged alternately along an extending direction of the elongated groove.