Fuel pipe for fuel injection device

Abstract

A fuel pipe (1) is provided inside with a fuel flow passage (2), a fuel inflow hole (JC) of a fuel injection valve (J) is open to the lower side of the fuel flow passage (2) in a gravitational direction, an opening portion (15A) of a fuel introduction pipe (15) connected to a fuel pump (P) is open to the fuel flow passage (2) at an upper position in the gravitational direction than a fuel inflow hole (JC), an atmospheric air releasing passage (3) is open to and connected to an uppermost position of the fuel flow passage (2) in the gravitational direction, and the atmospheric air releasing passage (3) is opened and closed by a normally closed type shut-off valve (4).

Description

technical field [0001] The present invention relates to a fuel injection device, which raises the pressure of the fuel in the fuel tank through a fuel pump, and supplies the boosted fuel to an internal combustion engine through a fuel injection valve, wherein the present invention particularly relates to a motor vehicle suitable for being installed on a motorcycle, a small Fuel pipes for fuel injection devices on trucks, outboard motors, general purpose motors, etc. Background technique [0002] Next, a fuel pipe of a conventional fuel injection device will be described with reference to FIG. 4 . [0003] 10 represents a throttle valve body penetrating through the side of the internal intake passage 11. The intake passage 11 is opened and closed by a butterfly throttle valve 13, which is mounted on a rotatably supported On the throttle body 10 is a throttle lever 12 which is operated by an operator. [0004] In addition, the air cleaner A is connected to the upstream side ...

AI Technical Summary

Problems solved by technology

[0013] According to the fuel pipe used in the above-mentioned conventional fuel injection device, when the motorcycle is continuously driven in a state where the external temperature is high, the engine is temporarily stopped and then restarted, among them (at the time of hot restart), there is In the smooth restart of the engine, or immediately after the engine is started, the driving is not normal

[0014] The first reason is that the temperature of the fuel in the fuel supply pipe 18, the fuel introduction pipe 15, the fuel pipe 13, etc. increases greatly.

[0015] That is, its reason is: with respect to the machine that the engine of motorcycle etc. is directly exposed, fuel pipe 18, fuel inlet pipe 15, fuel pipe 13 are easily directly affected by heat radiation from the engine after the engine stops; 18, 15, 13 Direct exposure to the atmosphere, easy exposure to outside air temperature, direct sunlight

[0016] The second reason is that the fuel pipe 18, the fuel inlet pipe 15, and the fuel pipe 13 are closed and connected to the fuel injection valve J.

[0019] In addition, in the state described above, if the engine is restarted, or the engine is driven immediately after the engine is started, the fuel pressure is lowered due to the steam contained in the fuel, or the amount of injected fuel discharged toward the engine is further increased in an intermittent manner. As a result, the startability of the engine deteriorates, or the driving is not normal immediately after starting

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