公开(公告)号：US11435259B2

公开(公告)日：2022-09-06

申请号：US17215781

申请日：2021-03-29

Applicant: DENSO CORPORATION

Inventor： Ryoyuu Kishi ,  Yasuo Katoh ,  Tomohiro Itoh

IPC: G01M3/32 ,  F02M25/08 ,  G01L19/06 ,  G01L19/14 ,  G01M3/28

Abstract: A pressure sensor for an evaporated fuel leak detector is used for checking airtightness in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case has a fluid flow path and a housing recess. A buffer recess having an outer shape larger than the outer shape of a pressure receiving surface is formed at a pressure receiving side L1 of the bottom of the housing recess. Further, a protruding cylinder portion protruding into the buffer recess toward a back side L2 is formed at an outer edge of an opening end portion of the fluid flow path on the back side L2.

公开(公告)号：US11480492B2

公开(公告)日：2022-10-25

申请号：US17215702

申请日：2021-03-29

Applicant: DENSO CORPORATION

Inventor： Ryoyuu Kishi ,  Tomohiro Itoh ,  Yasuo Katoh

IPC: G01M3/26 ,  F02M25/08

Abstract: A pressure sensor for an evaporated fuel leak detector is used for checking a leak in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit includes a pressure receiving portion for detecting a pressure of a fluid applied to a pressure receiving surface, and a mold resin portion covering a surface of the pressure receiving portion except for the pressure receiving surface. The case has a fluid flow path for introducing the fluid to the pressure receiving surface, and a housing recess in which the sensor unit is accommodated. The sealing resin is arranged in the housing recess, to at least cover a back surface of the mold resin portion located on an opposite side of the pressure receiving surface.

公开(公告)号：US11428601B2

公开(公告)日：2022-08-30

申请号：US17215667

申请日：2021-03-29

Applicant: DENSO CORPORATION

Inventor： Ryoyuu Kishi ,  Yasuo Katoh ,  Tomohiro Itoh

IPC: G01M3/26 ,  F02M25/08

Abstract: A pressure sensor for an evaporated fuel leak detector is used for checking a leak in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case is provided with a fluid flow path and a housing recess. The case has an annular inner wall surface that defines the housing recess and surrounds a side surface of the mold resin portion. The inner wall surface of the case is provided with a stepped surface that is parallel to the pressure receiving surface or is inclined by an internal angle of less than 90° with respect to the pressure receiving surface, in a cross section along a direction perpendicular to the pressure receiving surface.

公开(公告)号：US11674477B2

公开(公告)日：2023-06-13

申请号：US17323340

申请日：2021-05-18

Applicant: DENSO CORPORATION

Inventor： Keiichirou Ishihara ,  Tomohiro Itoh ,  Yasuo Katoh

IPC: F02M25/08 ,  G01M3/28

CPC classification number: F02M25/0809 ,  G01M3/2815

Abstract: A leak hole determination device in an evaporated fuel processing system. The leak hole determination device includes: a first pressure detector for detecting a first pressure in a fuel tank; a second pressure detector for detecting a second pressure in a canister; and a leak hole determiner for determining whether a leak hole is present. The leak hole determiner determines, after a limit pressure timing subsequent to a depressurization operation for depressurizing an inside of the system, whether a leak hole is present by using a difference between a change speed of a first pressure detected by the first pressure detector and a change speed of a second pressure detected by the second pressure detector.

公开(公告)号：US11493402B2

公开(公告)日：2022-11-08

申请号：US17215725

申请日：2021-03-29

Applicant: DENSO CORPORATION

Inventor： Ryoyuu Kishi ,  Yasuo Katoh ,  Tomohiro Itoh

IPC: G01M3/32

Abstract: A pressure sensor for an evaporated fuel leak detector includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case has a fluid flow path and a housing recess. Each remaining inner wall surface of the housing recess except for an inner wall surface on the conduction terminal side is provided with an inclined surface and a vertical surface, in a cross section along an axial direction perpendicular to a pressure receiving surface of the sensor unit. The inclined surface is inclined inward as toward a pressure receiving side. The vertical surface extends from the end of the inclined surface on the pressure receiving side to define a filling gap in which the sealing resin is filled between the side surface of the mold resin portion and the vertical surface.

公开(公告)号：US11428222B2

公开(公告)日：2022-08-30

申请号：US17000549

申请日：2020-08-24

Applicant: DENSO CORPORATION

Inventor： Keiichirou Ishihara ,  Tomohiro Itoh ,  Yasuo Katoh

IPC: F03C2/00 ,  F03C4/00 ,  F04C2/00 ,  F04C15/00 ,  F04C2/344 ,  F04C18/344 ,  F01C21/10 ,  F04C29/00 ,  F01C21/08

Abstract: A vane pump includes: a casing forming a pump chamber therein; a rotor arranged inside the casing to rotate eccentrically with respect to the casing; and a plurality of vanes configured to rotate with the rotor and slide on an inner side surface of the casing. At least one of Formula (1): l≤(b/a)×k and Formula (2): l≤(c/a)×j is satisfied, where “a” represents a height of the pump chamber, “b” represents a height of the rotor, “c” represents a height of the vane in a rotation axis direction of the rotor, and where “l” represents a linear expansion coefficient of the casing in the rotation axis direction, “k” represents a linear expansion coefficient of the rotor in the rotation axis direction, and “j” represents a linear expansion coefficient of the vane in the rotation axis direction.

公开(公告)号：US20210302266A1

公开(公告)日：2021-09-30

申请号：US17215781

申请日：2021-03-29

Applicant: DENSO CORPORATION

Inventor： Ryoyuu Kishi ,  Yasuo Katoh ,  Tomohiro Itoh

IPC: G01M3/32 ,  F02M25/08

Abstract: A pressure sensor for an evaporated fuel leak detector is used for checking airtightness in a fuel tank and a canister. The pressure sensor includes a sensor unit, a case, and a sealing resin. The sensor unit has a pressure receiving portion, a plurality of conduction terminals, and a mold resin portion. The case has a fluid flow path and a housing recess. A buffer recess having an outer shape larger than the outer shape of a pressure receiving surface is formed at a pressure receiving side L1 of the bottom of the housing recess. Further, a protruding cylinder portion protruding into the buffer recess toward a back side L2 is formed at an outer edge of an opening end portion of the fluid flow path on the back side L2.