Fuel supplying device

Abstract

Provided is a fuel supplying device which can regulates pressure for each voltage regulator with a cheap structure and has excellent noise silencing performance. A fuel passage 14d and a return passage 80 are arranged in a flange portion 50, wherein the fuel passage 14d sends fuel to the outside of a fuel tank 2, and the return passage 80 returns fuel flowing by the fuel passage 14d back to the fuel tank 2. A support 16d is arranged on the voltage regulator in the return passage 80, and retains an elastic supported spring 16c on a fuel inlet of the return passage 80. The support can be retained on the flange portion 50 of the return passage 80 on a movable area E along the telescoping direction of the spring 16c.

Description

Technical field [0001] The present invention relates to a fuel supply device that is held in an opening of a fuel tank of a two-wheeled vehicle or the like and used to send fuel out of the fuel tank. Background technique [0002] A conventional fuel supply device has: a stator part formed by molding a resin material to cover an iron core formed of a magnet wound with a coil; and a rotor part rotatably arranged on the iron core If the coil is energized on the inner peripheral side, it is rotated by the magnetic field formed by the coil. In addition, it has a pump portion and a flange portion. The pump portion has: an impeller, which is fixed to the rotating shaft of the rotor; a pump housing, which rotatably houses the impeller; and a housing, which holds the pump housing on its outer periphery It is connected to the stator part, and the flange part holds the stator part, covers and fixes the opening provided in the container to the container, thereby fixing the fuel pump to the ...

AI Technical Summary

Problems solved by technology

[0006] The conventional fuel supply device is constructed as described above. However, in the technique of Document 1, for example, since the pressure of the fuel reaching the inside of the fuel pipe of the engine depends on the dimensional accuracy of each part constituting the pressure regulator, there is no specific A mechanism that regulates pressure individually, so there is a problem of large fluctuations in fuel pressure

In addition, there is a problem that, since the bottom surface of the valve portion is part of the resin flange portion, the volume shrinkage during cooling after molding or the shape of the bottom surface is unstable due to swelling accompanied by impregnation of fuel, which tends to occur. Cavitation that causes pulsation and noise of fuel

In addition, in the technique of Document 2, since it is necessary to separately install a valve housing, cost reduction cannot be achieved.

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