Fuel pump and fuel supply system of internal combustion engine

Patent metadata

Field	Value
Publication number	US-9188096-B2
Application number	US-201113581698-A
Country	US
Kind code	B2
Filing date	Sep 6, 2011
Priority date	Sep 6, 2011
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

A fuel pump which can suppress fuel bubbles from being sucked into a fuel pressure chamber, and can achieve a stable fuel pressure property. The fuel pump has a pump body formed with a suction passage and a pump operation chamber, and a pressure pump mechanism to pressurize and discharge fuel. The pump body has a lower side wall portion and an upper side wall portion respectively at the vertically lower and upper sides of the inner wall portion forming a suction gallery chamber partly forming the suction passage. The pressure pump mechanism has a valve retaining member having an insertion portion inserted into the suction gallery chamber. The insertion portion has internal suction inlets through which the fuel is sucked from the suction gallery chamber into the pump operation chamber, the internal suction inlets being positioned in the intermediate height area in the suction gallery chamber.

First claim

The invention claimed is:

1. A fuel pump provided with a pump body and a pressure pump mechanism, the pump body being formed with a fuel introduction passage to introduce fuel from the outside and a pump operation chamber to introduce the fuel through the fuel introduction passage, and the pressure pump mechanism having an input portion having power inputted from the outside and discharging the fuel pressurized in a fuel pressure chamber formed in the pump operation chamber when the power is inputted to the input portion,
the pump body having a fuel storage chamber forming part of the fuel introduction passage, a lower side wall portion positioned at a vertically lower side of an inner wall portion partly forming the fuel storage chamber, and an upper side wall portion positioned at a vertically upper side of the inner wall portion partly forming the fuel storage chamber,
the pressure pump mechanism having an insertion portion inserted in the fuel storage chamber of the pump body to be positioned vertically between the lower side wall portion and the upper side wall portion of the pump body, the insertion portion having an internal suction inlet in the vertically intermediate height area in the fuel storage chamber to suck the fuel into the pump operation chamber from the fuel storage chamber.

2. In the fuel pump as set forth in claim 1 , in which the lower side wall portion receives heat from the outside to become a high temperature side wall portion in the pump body.

3. In the fuel pump as set forth in claim 1 , in which the pump body has a peripheral wall portion surrounding the circumference of the fuel storage chamber between the lower side wall portion and the upper side wall portion, and the insertion portion of the pressure pump mechanism is constructed to penetrate the peripheral wall portion.

4. In the fuel pump as set forth in claim 3 , in which at least one of the insertion portion of the pressure pump mechanism and the pump body is provided with a guide portion to guide bubbles generated and rising at the lower side wall portion in the direction different from the direction in which the bubbles are moved toward the internal suction inlet.

5. In the fuel pump as set forth in claim 4 , in which the guide portion has a guide surface intersecting with at least the wall surface portion positioned in the vicinity of the internal suction inlet in the inner peripheral wall surface of the peripheral wall portion of the pump body.

6. In the fuel pump as set forth in claim 4 , in which the guide portion is constituted by a groove or a ridge provided at the insertion portion of the pressure pump mechanism.

7. In the fuel pump as set forth in claim 1 , in which the insertion portion of the pressure pump mechanism accommodates therein a suction valve to be opened to allow the suction of the fuel into the fuel pressure chamber, and is formed therein with a fuel discharge passage to discharge the fuel from the fuel pressure chamber to the outside.

8. In the fuel pump as set forth in claim 4 , in which the pump body is mounted on the outer wall portion of an internal combustion engine, and the input portion is inputted with power from a driving member mounted on the internal combustion engine at the lower side wall portion of the pump body,
the guide portion has a plate-like member disposed between the lower side wall portion and the insertion portion of the pressure pump mechanism, and the inside of the fuel storage chamber is divided into a bubble suppression area having the internal suction inlet disposed therein and a bubble accommodation area accommodating therein and disappearing fuel bubbles.

9. In the fuel pump as set forth in claim 3 , in which the insertion portion of the pressure pump mechanism has the internal suction inlet at a position out of the inner peripheral surface of the peripheral wall portion in the radial direction of the peripheral wall portion of the pump body.

10. A fuel supply system of an internal combustion engine provided with the fuel pump as set forth in claim 1 comprises:
a feed pump that supplies fuel pumped up from a fuel tank to the fuel introduction passage of the fuel pump, and
a delivery pipe that stores the fuel pressurized and discharged by the pressure pump mechanism and supplies the fuel to a fuel injection valve,
the fuel storage chamber of the pump body having the fuel from the feed pump stored therein.

Assignees

• Usui Takashi
• Maeda Tomoyuki
• Asayama Kazuhiro
• Toyota Motor Co Ltd

Inventors

• Usui Takashi
• Maeda Tomoyuki
• Asayama Kazuhiro

Classifications

• F02M2200/40

  Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator · CPC title

• F02M69/02 Primary

  Pumps peculiar thereto {(elastic wall type pumps F02M59/14)} · CPC title

• F02M59/44 Primary

  Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; {Pumps having transducers, e.g. to measure displacement of pump rack or piston} · CPC title

• F02M59/462

  Delivery valves · CPC title

• F02M63/0265

  Pumps feeding common rails · CPC title