Fuel Supply Device

Patent metadata

Field	Value
Publication number	US-2021396196-A1
Application number	US-201917285580-A
Country	US
Kind code	A1
Filing date	Oct 1, 2019
Priority date	Oct 15, 2018
Publication date	Dec 23, 2021
Grant date	—

Abstract

A fuel supply device includes a fuel pump, a sub-tank configured to store a fuel, a leakage passage configured to return a part of a pressurized fuel discharged from the fuel pump into the sub-tank, and a fuel filter disposed at a bottom part of the sub-tank . The fuel filter includes a filter member that is configured to filter the fuel to be suctioned into the fuel pump. A downstream end of the leakage passage includes a linear passage part linearly extending from a position above the filter member toward the filter member. The fuel supply device also includes a direction change wall part configured to change the flow direction of the pressurized fuel jetted from the linear passage part so as to prevent the pressurized fuel from directly impacting the filter member.

First claim

1 . A fuel supply device for supplying a fuel in a fuel tank to an engine, the fuel supply device comprising:
a fuel pump; a sub-tank coupled to the fuel pump and configured to store the fuel; a pressurized fuel return passage in fluid communication with an outlet of the fuel pump, wherein the pressurized fuel return passage is configured to flow a part of a pressurized fuel discharged from the fuel pump into the sub-tank; and a fuel filter disposed at a bottom part of the sub-tank and including a filter member a bag-like shape and configured to filter the fuel suctioned into the fuel pump; wherein a downstream end of the pressurized fuel return passage includes a linear passage part extending linearly from a position above the filter member toward the filter member; a wall member positioned between the linear passage part of the pressurized fuel return passage and the filter member; such that the linear passage part extends linearly toward the wall member.

2 . The fuel supply device according to claim 1 , further comprising:
a downstream side passage member defining the linear passage part of the pressurized fuel return passage, wherein: the wall member is formed at the downstream side passage member; the downstream side passage member includes a pressurized fuel jet port configured to jet the pressurized fuel; and the pressurized fuel jet port is located downstream of the wall member.

3 . The fuel supply device according to claim 2 ,
wherein the wall member and the pressurized fuel jet port are formed at the downstream side passage member as one piece.

4 . The fuel supply device according to claim 2 ,
wherein the downstream side passage member includes a facing wall having a recessed arc shape and facing the pressurized fuel jet port; and wherein a lower end of the facing wall is positioned directly above the filter member.

5 . The fuel supply device according to claim 1 , further comprising:
an upstream side passage member defining an upstream end of the pressurized fuel return passage, wherein the upstream side passage member includes a restriction part configured to restrict a fuel leakage amount.

6 . A fuel supply device for supplying a fuel in a fuel tank to an engine, fuel supply device comprising:
a fuel pump; a sub-tank couple to the fuel pump and configured to store the fuel; a pressurized fuel return passage in fluid communication with an outlet of the fuel pump, wherein the pressurized fuel return passage is configured to flow a part of a pressurized fuel discharged from the fuel pump into the sub-tank; a fuel filter disposed at a bottom part of the sub-rank and including a filter member having a bag-like shape, wherein the filter member is configured to filter the fuel suctioned into the fuel pump; a leading passage forming member defining the pressurized fuel return passage; a pressure regulator attached to the leading passage forming member and configured to control a pressure of the pressurized fuel and configured to discharge an excess portion of the pressurized fuel; and a retaining member attached to the leading passage forming member and configured to prevent detachment of the pressure regulator wherein: the retaining member includes a wall member positioned between an outlet of the pressure regulator and the filter member such that the excess portion of the pressurized fuel is discharged from the outlet of the pressure regulator toward the wall member; and the retaining member includes a pressurized fuel jet port disposed downstream of the wall member and configured to jet the pressurized fuel into the sub-tank.

7 . The fuel supply device according to claim 1 , wherein the filter member includes a horizontally oriented upper surface part; and
wherein the linear passage part extends linearly toward the horizontal upper surface part in a direction oriented perpendicular to the upper surface part.

8 . The fuel supply device according to claim 1 , wherein a projection of a central axis of the linear passage part intersects the filter member, and
wherein the projection of the central axis of the linear passage part passes through the wall member.

9 . The fuel supply device according to claim 1 , wherein a flow direction of the pressurized fuel jetted from the linear passage part is directed toward the filter member.

10 . The fuel supply device according to claim 9 , wherein the flow direction of the pressurized fuel jetted from the linear passage part intersects the wall member.

11 . The fuel supply device according to claim 2 , wherein a flow direction of the pressurized fuel jetted from the pressurized fuel jet port is non-parallel to a flow direction of the pressurized fuel within the linear passage part.

12 . The fuel supply device according to claim 6 , wherein the wall member is positioned between the pressure regulator and the filter member in a flow direction of the pressurized fuel discharged from the pressure regulator.

13 . The fuel supply device according to claim 6 , wherein a flow direction of the pressurized fuel jetted from the pressurized fuel jet port is non-parallel to a flow direction of the pressurized fuel discharged from the pressure regulator.

Assignees

• Aisan Ind

Inventors

• Higashi Shinya
• Yoshida Koji
• Nakamura Satoshi
• Go Masashi

Classifications

• F02M37/0052 Primary

  Details on the fuel return circuit; Arrangement of pressure regulators · CPC title

• F02M37/106 Primary

  the pump being installed in a sub-tank · CPC title

• F02M2037/082

  Details of the entry of the current supply lines into the pump housing, e.g. wire connectors, grommets, plugs or sockets · CPC title

• F02M37/44

  Filters structurally associated with pumps · CPC title

• F02M37/08 Primary

  electrically driven · CPC title