JP2005273531A - Method for cooling injector, fuel feeding device, and running vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel feeding device capable of easily effecting restarting by suppressing the generation of vapor when restarting after an engine is stopped after high load running. <P>SOLUTION: A method is for cooling an injector to feed fuel to the engine and a method for causing the convection of fuel in a fuel feed passage 19 connected to the injector 27 and cooling the injector by taking by force the heat of the injector 27 and surroundings by the convection of fuel. A fuel feed passage 19 through which the injector 27 to inject and feed fuel to an engine 13 is connected to a fuel tank 15 is provided with a convection region 35 where fuel heated in the vicinity of the injector 27 is raised and fuel cooled at an upper part descends to the injector 27 position and the convection region 35 of the fuel feed passage 19 is positioned in a lengthened state in a vertical direction and the convection region is provided at its upper part with a radiation part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an injector cooling method and fuel supply device for injecting and supplying fuel to an engine provided in a traveling vehicle such as a motorcycle, and a traveling vehicle such as a motorcycle. The present invention relates to an injector cooling method, a fuel supply device, and a traveling vehicle that can be easily restarted after the engine is later stopped.

  For example, in a traveling vehicle such as a motorcycle, when the engine is stopped after traveling at a high load, the cooling of the engine is stopped, and the engine is kept at a high temperature. Therefore, the injector for injecting and supplying fuel to the engine becomes a high temperature. Therefore, vapor may be generated in the fuel in and around the injector. Further, in the idling state of the air-cooled engine for a long time, the engine is not actively cooled by the traveling wind, so that similarly, the injector becomes hot, vapor is generated, and the engine may be stopped.

Thus, a configuration has been proposed in which vapor generated in the vicinity of the injector is accumulated at a position away from the injector so that the vapor does not enter the injector when the engine is restarted (see, for example, Patent Document 1).
JP-A-8-200196

  As shown in FIG. 4, the configuration described in Patent Document 1 includes a bent portion that is bent at a position higher than the inlet 105 in the fuel pipe 107 connected to the inlet 105 of the delivery pipe 103 disposed on the upper side of the injector 101. 109 is provided. The vapor generated in the fuel is stored in the upper portion of the delivery pipe 103 and the bent portion 109.

  That is, according to the above configuration, the vapor generated in the fuel is intended to float to the upper side of the fuel, and is not intended to suppress the generation of the vapor. Therefore, there is a problem that it is difficult to apply when it does not have a configuration corresponding to the delivery pipe.

  The present invention has been made in view of the above-described problems, and is a method for cooling an injector that injects and supplies fuel to an engine, and causes convection of fuel in a fuel supply path connected to the injector. The fuel and the surrounding heat are taken away and cooled by the convection of the fuel.

  Further, according to the present invention, the fuel heated in the vicinity of the injector rises in the fuel supply path connecting the injector and the fuel tank for injecting and supplying fuel to the engine, and the fuel cooled in the upper part is supplied to the injector. A convection region descending to a position is provided.

  In the fuel supply apparatus according to the present invention, the convection region of the fuel supply path is long in the vertical direction.

  Further, the present invention is characterized in that in the fuel supply device, a heat radiating portion is provided above the convection region.

  The present invention is also a traveling vehicle comprising traveling wheels that are rotated by driving an engine, wherein the injector is connected to a fuel supply path that connects an injector that supplies fuel to the engine and a fuel tank. The convection area | region part extended toward the upper direction from this position is provided, It is characterized by the above-mentioned.

  In the traveling vehicle according to the present invention, the convection region portion is provided so as to avoid a position directly above the engine.

  According to the present invention, in the fuel supply path connected to the injector, the heated fuel rises by removing heat from the injector, and the fuel cooled by releasing heat in the upper portion falls to the position of the injector. Therefore, the injector and the fuel can be cooled effectively, the fuel can be prevented from being heated to a high temperature, and the vapor can be prevented from being generated in the fuel.

  Referring to FIG. 1, a motorcycle 1 is schematically illustrated as an example of a traveling vehicle according to the present invention. The motorcycle 1 is already well known, but will be described briefly. The motorcycle 1 includes a front wheel 3 and a rear wheel 5 and a handle 7. A vehicle body 11 including a saddle 9 includes an engine 13 and a fuel tank 15 at an appropriate position. Yes.

  In order to supply the fuel in the fuel tank 15 to the engine 13, the fuel tank 15 is provided with a fuel pump 17, and the fuel pump 17 and the engine 13 are fuels including appropriate pipes or the like. It is connected via a supply path 19. More specifically, an inlet port 21 is connected to the engine 13, and an inlet manifold 29 including an air cleaner 23, a throttle valve 25, and an injector 27 is provided in the inlet port 21. The fuel supply path 19 is connected to the injector 27.

  As schematically shown in FIG. 2, the injector 27 is housed in a pedestal portion 31 provided in the inlet manifold 29 and is fixed by a cylindrical holder 33. The end of the fuel supply path 19 is connected to the holder 33.

  The fuel supply passage 19 has such a thickness that the convection is likely to occur so that the fuel heated in the injector 27 and the holder 33 rises and the fuel cooled in the upper part descends, and the convection is The convection region 35 is long in the vertical direction so as to be easily generated. More specifically, the convection region 35 is inclined so as to avoid the position directly above the engine 13, and the upper part thereof is a position where the influence of heat from the engine 13 is small, that is, the engine 13 becomes hot. Even if the surrounding air is heated, it is provided at a position where there is little influence of high-temperature air.

  The fuel supply path 19 is preferably thicker than a normal fuel pipe so that convection of the fuel is likely to occur inside. For example, a pipe having an inner diameter of 6 mm or more is desirable, and considering the ease of piping and the like, it is desirably 12 mm or less.

  With the above-described configuration, when the engine 13 is stopped after the motorcycle 1 is traveling at a high load, the traveling wind does not hit the engine 13, the engine 13 is not cooled, and the heat of the hot engine 13 is heated by the inlet manifold 29 and the pedestal portion 31. , Is transmitted to the injector 27 through the holder 33 and the like. That is, since the injector 27 is heated, the fuel in contact with the injector 27 and the holder 33 is heated.

  The heated fuel rises along the upper side of the inner surface of the convection region 35 in the fuel supply path 19 and moves to the upper portion of the convection region 35. Then, the fuel cooled by radiating heat in the heat radiating portion at the upper part of the convection region 35 descends along the lower side of the inner surface of the convection region 35. That is, in the convection region 35 in the fuel supply path 19, fuel convection occurs, the fuel cooled by the fuel convection contacts the injector 27, the injector 27 is cooled, and the fuel itself is cooled. Is done.

  Accordingly, the fuel in the injector 27 can be prevented from becoming high temperature, the generation of fuel vapor in the injector 27 can be suppressed, and the generation of fuel vapor in the vicinity of the injector 27 can be suppressed. Therefore, when the engine 13 is stopped and restarted after traveling at a high load, vapor is not sucked into the injector 27, and the engine 13 can be started easily. Further, even in idling for a long time in an air-cooled engine, the fuel itself and the injector 27 are cooled by the convection of the fuel, and the generation of vapor is suppressed.

  FIG. 3 shows a second embodiment, and the same reference numerals are given to components having the same functions as the components of the above-described embodiment, and redundant description is omitted.

  In the second embodiment, a metal heat radiating pipe 37 made of, for example, aluminum is disposed in the heat radiating area (heat radiating portion) above the convection area 35 so that the fuel rising in the convection area 35 It is set as the structure which can perform heat dissipation more effectively. In addition, as a structure of the heat radiating tube 37, in order to enlarge a heat radiating area, it is desirable to form the surface in uneven surfaces, such as a waveform, or to provide a heat radiating fin etc., for example.

  According to the above configuration, the fuel that has risen in the convection region 35 is effectively cooled, and the injector 27 is more effectively cooled by the fuel that convects in the convection region 35. Therefore, also in the second embodiment, the same effect as that of the above-described embodiment can be obtained.

  By the way, for example, one end of the fuel supply path 19 is connected to the convection region 35 in the vicinity of the holder 33 on the upper side of the convection region 35 so that the convection in the convection region 35 can be effectively performed. It is also possible to provide a bypass path 39 having the other end connected to the upper end side of the convection region 35.

  In this case, as indicated by an imaginary line in FIG. 3, a bypass path 39 is provided outside the fuel supply path 19, and the heated fuel can be configured to rise in the bypass path 39. Further, in the fuel supply path 19, the fuel in the convection region 35 is heated as a configuration in which a partition member such as a film or a plate for partitioning the fuel supply path 19 vertically along the fuel flow direction is provided. It is also possible to partition into an ascending region where the temperature rises and a descending region where the fuel cooled on the upper end side descends. In the above configuration, the fuel that rises when heated and the fuel that descends after cooling are not in direct contact with each other, and convection and cooling of the fuel can be performed effectively.

  As already understood, because the fuel itself and the injector are cooled by the convection of the fuel to suppress the generation of the vapor, the fuel supply path and the injector can be directly connected, and the configuration This is useful in the case of a so-called fuel returnless system that does not include piping for returning surplus fuel to the fuel tank.

It is explanatory drawing which showed schematically the whole structure of the motorcycle. 1 is a cross-sectional explanatory view conceptually and schematically showing a fuel supply device according to a first embodiment of the present invention. FIG. 5 is a cross-sectional explanatory view conceptually and schematically showing a fuel supply device according to a second embodiment of the present invention. It is sectional explanatory drawing which shows the conventional structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 13 Engine 15 Fuel tank 17 Fuel pump 19 Fuel supply path 27 Injector 29 Inlet manifold 31 Base part 33 Holder 35 Convection area 37 Radiation pipe

Claims (6)

  A method for cooling an injector for injecting and supplying fuel to an engine, wherein fuel convection is generated in a fuel supply path connected to the injector, and the fuel and surrounding heat are taken and cooled by the convection of the fuel. An injector cooling method characterized by the above.   A convection region in which the fuel heated in the vicinity of the injector rises and the fuel cooled in the upper part descends to the injector position in a fuel supply path connecting an injector for supplying fuel to the engine and a fuel tank A fuel supply device comprising:   3. The fuel supply apparatus according to claim 2, wherein the convection region of the fuel supply path is long in the vertical direction.   The fuel supply apparatus according to claim 2, further comprising a heat radiating portion at an upper portion of the convection region.   A traveling vehicle comprising traveling wheels that are rotated by driving an engine, wherein the fuel supply path that connects an injector for supplying fuel to the engine and a fuel tank is connected upward from the position of the injector. A traveling vehicle comprising a convection region portion extending in a direction.   The traveling vehicle according to claim 5, wherein the convection region portion is provided so as to avoid a position directly above the engine.

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