公开(公告)号：US20210302262A1

公开(公告)日：2021-09-30

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：US20210363942A1

公开(公告)日：2021-11-25

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

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：US20210302265A1

公开(公告)日：2021-09-30

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：US20210302261A1

公开(公告)日：2021-09-30

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：US20210062810A1

公开(公告)日：2021-03-04

申请号：US17000549

申请日：2020-08-24

Applicant: DENSO CORPORATION

Inventor： Keiichirou ISHIHARA ,  Tomohiro ITOH ,  Yasuo KATOH

IPC: F04C18/344 ,  F04C29/00 ,  F01C21/10

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): I≤(b/a)×k and Formula (2): I≤(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 “I” 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.