JP4126435B2 - Fuel introduction pipe in motorcycle throttle body - Google Patents

Description

  The present invention relates to an engine that generates a driving force, a throttle body equipped with a fuel injection valve that supplies desired air and fuel toward the engine, and a fuel that stores fuel supplied toward the fuel injection valve. In particular, the fuel in the fuel tank is supplied from the fuel discharge path of the fuel tank to the fuel inflow path of the fuel distribution pipe into which the rear end of the fuel injection valve is inserted through the fuel introduction pipe. The present invention relates to a fuel introduction pipe in a throttle body of a motorcycle.

The fuel inlet pipe in the throttle body of a conventional two-wheeled vehicle will be described with reference to FIG.
For ease of explanation, the motorcycle body, tires, engine, etc. are omitted.
T is a fuel tank in which fuel is stored, and an electrically driven fuel pump P is immersed in the fuel tank T.
Reference numeral 1 denotes a fuel discharge passage which is open and disposed so as to protrude from the lower surface Ta of the fuel tank T.
Therefore, when the fuel pump P is driven, the fuel in the fuel tank T is sucked into the fuel pump P from the pump suction path Pb, and the fuel boosted in the fuel pump P is discharged from the pump discharge path Pa to the fuel discharge path. 1 is supplied.
The fuel tank is formed such that a bearing portion Td having a bearing hole Tc formed on the rear end Tb thereof protrudes downward. 2 is inserted and arranged, and according to this, the fuel tank T is swingably supported with respect to the shaft 2.
Further, the fuel discharge path 1 described above is opened at the front end Te side of the fuel tank T. When the shaft 2 is used as a reference, the fuel discharge path 1 is located larger than the shaft 2 and separated from the front end Te side. Become.
In this way, the fuel tank T is slidably disposed with respect to the shaft 2 as the fuel tank T is slid upward so as to secure the opening A, for example, an ignition plug disposed below the fuel tank T. This is performed in order to carry out the maintenance work for the component parts without removing the fuel tank T from the vehicle body one by one.
Reference numeral 3 denotes a throttle body in which an intake passage 4 penetrates and an opening area of the intake passage is controlled to be opened and closed by a throttle valve (not shown). The throttle body 3 includes a fuel injection valve. J is attached.
The fuel injection valve J has a fuel injection side tip portion inserted into the support hole of the throttle body 3 and a fuel inflow side rear end portion inserted into the support hole of the fuel distribution pipe 5. The valve J is sandwiched and fixed by the throttle body 3 and the fuel distribution pipe 5.
The main flow path 5a formed on the side of the fuel distribution pipe 5, the sub flow path 5b branched from the main flow path 5a, and the fuel inflow path 6 opened toward the main flow path 5a. Thus, the auxiliary flow path 5b is connected to the rear end portion on the inflow side of the fuel injection valve J.
The throttle body 3 including the fuel injection valve J and the fuel distribution pipe 5 is disposed facing the lower surface Ta of the fuel tank T.
The throttle body 3 is fixedly disposed in an engine (not shown), and each intake passage 4 is connected to each cylinder of the engine via an intake pipe.
Reference numeral 20 denotes a fuel introduction pipe formed of an elastic material and having a spiral portion 20a formed in a spiral shape. The upper end opening thereof is connected to the fuel discharge passage 1, and the lower end opening is connected to the fuel inflow passage 6. The spiral portion 20a is disposed facing the lower surface Ta of the fuel tank T.

  According to the above, when the fuel pump P is energized and the fuel pump P is driven, the fuel in the fuel tank T is sucked into the fuel pump P from the pump suction passage Pb and boosted, and this boosted fuel is discharged from the pump. The fuel is supplied to the fuel injection valve J via the passage Pa, the fuel discharge passage 1, the fuel introduction pipe 20, the fuel inflow passage 6, the main flow path 5a of the fuel distribution pipe 5, and the sub flow path 5b. An injection is supplied into the intake passage 2 of the body 3.

According to the fuel introduction pipe in the throttle body of such a motorcycle, for example, during the maintenance work of the spark plug, the fuel tank T is swung counterclockwise, and the opening A is secured on the tip Te side of the fuel tank T. Thus, the maintenance work of the spark plug is performed.
At the end of the maintenance work, the fuel tank T is returned to the original position again.
When the fuel tank T is oscillated, the fuel introduction pipe 20 is provided with the spiral portion 20a, so that the fuel introduction pipe 20 is fully extended to restrict the oscillation of the fuel tank T, or the fuel introduction pipe 20 is slipped. There is no problem, and the fuel tank T can be satisfactorily operated.

However, according to the fuel introduction pipe 20, when the fuel tank T is swung, there is a fear that a large twist is generated in the spiral portion 20 and the stress is excessively applied, and it cannot be used stably for a long time.
In order to eliminate the large twist in the spiral portion, it is considered that the number of turns of the spiral portion 20 is increased. However, the size in the height direction of the spiral portion 20a is increased, particularly in a motorcycle, This is not preferable in the case where the storage space in the lower direction of the fuel tank T is greatly limited.

  The fuel introduction pipe in the throttle body of the motorcycle according to the present invention has been made in view of the above problems, and in the case where the fuel tank is peristated, the amount of twist of the fuel introduction pipe during peristalsis is reduced as much as possible for a long time. It is an object of the present invention to provide the fuel pipe that can stably use the fuel introduction pipe and can reduce the storage space of the fuel introduction pipe as much as possible.

In order to achieve the above object, the fuel introduction pipe in the throttle body of the motorcycle according to the present invention is provided with a throttle body having a fuel injection valve below the fuel tank, and the fuel in the fuel tank passes through the fuel introduction pipe. In fuel piping supplied toward the fuel injection valve,
In the fuel tank, a bearing portion provided on the rear end side thereof is rotatably supported by a shaft , and a fuel discharge passage connected to a pump discharge passage of the fuel pump is opened at a bottom surface of the front end side,
The fuel injection valve has a front end inserted into the throttle body, a rear end inserted into the fuel distribution pipe, and is held between the throttle body and the fuel distribution pipe, and a fuel inflow passage is opened in the fuel distribution pipe. Arranged,
In addition, the fuel introduction pipe includes a top-side pipe part having a linear or curved shape formed at the top side part, a first rising pipe part formed by bending from one end of the top-side pipe part, and a top side pipe. A second rising pipe part formed by bending from the other end of the part, and a U-shaped pipe part formed of a rigid material and a first rising pipe part of the U-shaped pipe part formed of an elastic material. A substantially straight first connecting pipe connected to
Formed by an elastic material, and formed by a substantially straight second connecting pipe connected to the second rising pipe part of the U-shaped pipe part,
Connecting the opening of the first connecting pipe to the fuel discharge passage of the fuel tank and connecting the opening of the second connecting pipe to the fuel inflow passage of the fuel distribution pipe;
Furthermore the top side tube portion of the fuel introduction pipe, a first feature in that arranged close to the axis as well as parallel to the longitudinal axis of the shaft.

According to the present invention, at the time of swinging of the fuel tank, mainly because the first connection tube formed is formed on Rutotomoni substantially linearly elastic material is bent, it can reduce the occurrence of twist of the fuel conduit, the fuel inlet tube Can be used stably over a long period of time.
In addition, since the fuel introduction pipe is formed in a U-shape, the fuel introduction pipe can be arranged in a substantially parallel state along the bottom surface of the fuel tank, and the two-wheeled vehicle in which the storage space on the lower surface of the fuel tank is limited. Mountability can be greatly improved.

One embodiment of a fuel introduction pipe in a throttle body of a motorcycle according to the present invention will be described with reference to FIGS.
FIG. 1 is a top plan view of a fuel introduction pipe according to the present invention.
FIG. 2 is a side view showing a state where the fuel introduction pipe of FIG. 1 is attached to a fuel tank and a throttle body.
3 is a top plan view of FIG. It is.
Note omitted, the fuel tank T having a built-in fuel pump P, a throttle body 3 comprising a fuel injection valve J, the fuel distribution pipe 5 is the same as that in FIG. 4 using the same reference numerals and description.
The fuel introduction pipe F will be described with reference to FIG.
Fa is a linear or curved top tube portion formed at the U-shaped top portion, and the first rising tube portion Fb is bent from one end Fa1, and the other end of the top tube portion is formed. The second rising pipe portion Fc is bent from Fa2.
That is, the top tube portion Fa, the first riser tube portion Fb, and the second riser tube portion Fc form a U-shaped tube portion U. The U-shaped tube portion U is a rigid member such as an iron pipe or a synthetic resin pipe. Formed by the material.
Then, a substantially straight first connecting pipe Fe formed of an elastic material is connected to the first rising pipe part Fb of the U-shaped pipe part U made of the rigid material, and the second rising pipe part Fc is formed of an elastic material. The substantially straight second connection pipe Ff is connected to form a fuel introduction pipe F having a substantially U shape.
That is, the fuel introduction pipe F includes a U-shaped pipe part U formed by the top side pipe part Fa, the first rising pipe part Fb, and the second rising pipe part Fc, the first connecting pipe Fe, and the second connecting pipe. It is formed in a substantially U shape by Ff.

Then, the fuel inlet pipe is disposed along the lower surface Ta of the fuel tank T, the opening Fe1 of the first connection pipe Fe of the fuel inlet pipe is connected to the fuel discharge passage 1, the opening Ff1 of the second connecting pipe Ff Connected to the fuel inflow path 6.
It should be particularly noted at this time that the apical tube portion Fa is arranged substantially in parallel along the longitudinal axis XX of the shaft 2. And the apical tube portion Fa is disposed close to the shaft 2.
As shown in FIG. 3, the close arrangement in the above means that the distance L between the longitudinal axis XX of the shaft 2 and the fuel discharge path 1 is within a range C within the ½ position on the shaft 2 side. The top side pipe portion Fa is arranged close to each other.

According to the above, the fuel introduction pipe F formed in a substantially U-shape is arranged along the lower surface Ta of the fuel tank T, and the fuel discharge path 1 in which the opening Fe1 of the first connection pipe Fe protrudes from the lower surface Ta of the fuel tank T. The opening Ff1 of the second connection pipe Ff is connected to the fuel inflow path 6 of the fuel distribution pipe 5.
Therefore, when the fuel pump P is energized and the fuel pump P is driven, the fuel in the fuel tank T is sucked into the fuel pump P from the pump suction passage Pb and boosted, and the boosted fuel is supplied to the fuel discharge passage. 1 is supplied to the main flow path 5a of the fuel distribution path 5 via the fuel introduction pipe F and the fuel inflow path 6, and this fuel is further supplied to the fuel injection valve J of each throttle body 3 via the sub flow path 5b. .

Here, when the fuel tank T is swung counterclockwise with respect to the shaft 2 and the fuel tank T is lifted up, an opening A is formed, and maintenance work such as a spark plug is performed through the opening A. It is.
Here, according to the lift-up of the fuel tank T, the fuel discharge path 1 moves upward in synchronization with the fuel tank T, and the first connecting pipe Fe connected to the fuel discharge path 1 is pulled upward. However, at this time, the first connecting pipe Fe is not twisted.
That is, the first connecting pipe Fe is formed in a substantially straight shape and does not have a bent portion in a substantially right angle direction. (In the second connecting pipe Ff, since the fuel inflow path 6 is not displaced, twisting does not occur beyond the first connecting pipe Fe.)
Therefore, even if the fuel tank T is lifted up repeatedly over a long period of time, there is no occurrence of cracking or breakage due to twisting, and the fuel introduction pipe F can be used stably over a long period of time.
On the other hand, in the second connecting pipe Ff , the opening Ff1 is fixedly arranged in the fuel inflow path 6 that does not move yet (the fuel distribution pipe 5 does not swing ), so that no problem due to twisting occurs.
Furthermore, the fuel introduction pipe F has a single pipe diameter in the up-down direction, and can suppress the thickness in the up-down direction to a minimum, and can greatly improve the storage property with respect to the lower surface Ta of the fuel tank T.

1 is an upper plan view showing an embodiment of a fuel introduction pipe used for a throttle body of a motorcycle according to the present invention. The side view including the fuel tank which shows one Example of the fuel introduction pipe | tube in the throttle body of the two-wheeled vehicle of this invention. FIG. 3 is a top plan view of FIG. 2. The side view which shows the conventional fuel introduction pipe | tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuel discharge path 2 Shaft 3 Throttle body 5 Fuel distribution pipe 6 Fuel inflow path F Fuel introduction pipe Fa Top side pipe part Fb 1st rise pipe part Fc 2nd rise pipe part Fe 1st connection pipe Ff 2nd connection pipe

Claims (1)

In a fuel pipe in which a throttle body including a fuel injection valve is disposed below the fuel tank, and fuel in the fuel tank is supplied to the fuel injection valve via a fuel introduction pipe,
In the fuel tank, a bearing portion (Td) provided on the rear end (Tb) side is rotatably supported by the shaft (2), and a fuel pump (P ) is provided on a bottom surface (Ta) on the front end (Te) side. The fuel discharge passage (1) connected to the pump discharge passage (Pa) of FIG .
The front end of the fuel injection valve is inserted into the throttle body (3), the rear end is inserted into the fuel distribution pipe (5), and is sandwiched between the throttle body (3) and the fuel distribution pipe (5). And a fuel inflow passage (6) is opened in the fuel distribution pipe (5).
In addition, the fuel introduction pipe is formed by bending a straight or curved top side pipe part (Fa) formed at the top side part and one end (Fa1) of the top side pipe part (Fa). 1 U rise pipe part (Fb) and 2nd rise pipe part (Fc) formed by bending from the other end (Fa 2) of the top side pipe part (Fa) and U formed by a rigid material The tube (U),
A substantially straight first connecting pipe (Fe) formed of an elastic material and connected to the first rising pipe section (Fb) of the U-shaped pipe section (U);
A substantially straight second connection pipe (Ff) formed of an elastic material and connected to the second rising pipe section (Fc) of the U-shaped pipe section (U);
The opening (Fe1) of the first connecting pipe is connected to the fuel discharge path (1) of the fuel tank (T), and the opening (Ff1) of the second connecting pipe (Ff) is supplied to the fuel distribution pipe (5). Connected to the road (6)
Furthermore the top side tube portion of the fuel inlet pipe (F) and (Fa), the shaft (2) longitudinal axis of the (X) - is arranged in proximity to the axis with (X) and arranged parallel to (2) A fuel introduction pipe for a throttle body of a two-wheeled vehicle.

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