Fuel supply device

Patent metadata

Field	Value
Publication number	US-10669976-B2
Application number	US-201716077553-A
Country	US
Kind code	B2
Filing date	Feb 24, 2017
Priority date	Mar 24, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A fuel supply device includes: a cover attached to an upper wall of a fuel tank; a pump unit disposed on a bottom wall of the fuel tank; and a connecting strut that connects the cover and the pump unit with each other. The pump unit includes: a unit body supported by the connecting strut in a radial direction and a thrust direction, and a fuel pump arranged on the unit body to pump fuel drawn from the fuel tank toward an internal-combustion engine. The fuel pump is located offset toward the connecting strut from a width center of a width from a thrust support part where the unit body is supported by the connecting strut to an end part of the unit body opposite from the connecting strut in a specific transverse direction.

First claim

The invention claimed is:

1. A fuel supply device that supplies fuel to an internal-combustion engine from a fuel tank for a vehicle, the fuel supply device comprising:
a cover to be attached to an upper wall of the fuel tank;
a pump unit to be disposed on a bottom wall of the fuel tank to pump fuel from the fuel tank toward the internal-combustion engine; and
a connecting strut that connects the cover and the pump unit with each other,
the pump unit includes
a unit body supported by the connecting strut in a radial direction and a thrust direction, and
a fuel pump arranged on the unit body to pump fuel drawn from the fuel tank toward the internal-combustion engine, the center of gravity of the fuel pump being located offset toward the connecting strut than a width center of a width of the unit body, the width being defined from a thrust support part where the unit body is supported by the connecting strut to an end part of the unit body opposite from the connecting strut in a specific transverse direction, wherein:
a subtank is provided on the unit body, and has an inner space to store fuel to be drawn by the fuel pump from the fuel tank,
the subtank has an enlarging part that enlarges the inner space, and
the enlarging part is projected in a remaining space that remains around the fuel pump, on a side opposite from the connecting strut through the width center of the width of the unit body in the specific transverse direction.

2. The fuel supply device according to claim 1 , wherein
the pump unit further has a surface detection unit that detects a height of fuel surface in the fuel tank, and
the surface detection unit is arranged in a remaining space that remains around the fuel pump, on a side opposite from the connecting strut through the width center of the width of the unit body in the specific transverse direction.

3. The fuel supply device according to claim 1 , wherein
the pump unit further has a jet pump that pumps fuel from the fuel tank to the inner space through a diffuser passage in which a pressurization fuel is ejected with operation of the fuel pump, and
the jet pump is arranged in the remaining space that remains around the fuel pump, on a side opposite from the connecting strut through the width center of the width of the unit body in the specific transverse direction.

4. The fuel supply device according to claim 3 , wherein
the subtank has an inflow part into which the fuel pumped by the jet pump flows from an exit of the diffuser passage, and a guide part that guides fuel overflowing from an upper opening of the inflow part to the inner space, the inflow part being shaped in a based cup,
the guide part forms an open hole open to the fuel tank at a position upper than the upper opening, and
the fuel pump has a discharge pore for discharging vapor fuel drawn during operation at a position lower than the upper opening.

5. The fuel supply device according to claim 3 , wherein
the jet pump has a throat part that forms the diffuser passage,
a center line of an outer diameter of the fuel pump is along the bottom wall, and offset toward the connecting strut from the width center of the width of the unit body in the specific transverse direction, and
a center line of an inner diameter of the throat part is along the bottom wall and the center line of the outer diameter of the fuel pump, and is located on a side opposite from the connecting strut through the width center of the width of the unit body in the specific transverse direction.

6. The fuel supply device according to claim 1 , wherein
a center line of an outer diameter of the fuel pump is along the bottom wall, and offset toward the connecting strut from the width center of the width of the unit body in the specific transverse direction.

Assignees

• Denso Corp

Inventors

• Fukuoka Shingo
• Hayashi Norihiro
• Okazono Tetsuro

Classifications

• F02M37/20

  characterised by means for preventing vapour lock · CPC title

• B60K15/03

  Fuel tanks · CPC title

• B60K2015/03138

  Pumping means between the compartments · CPC title

• B60K2015/03243

  characterised by special pumps, the mounting thereof · CPC title

• F02M37/106 Primary

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