JP2008261293A - Subsequent fuel pump unit for motorcycles - Google Patents

Abstract

[Object] To provide a subordinate fuel pump unit device for a motorcycle capable of satisfactorily performing rapid acceleration operation, operation immediately after rapid deceleration operation, and operation immediately after rapid jump operation.
[Structure] A fuel pump P, a fuel casing F that closes the entire outer periphery of the fuel pump P and the fuel filter F are fixedly arranged on the lid member 1 that closes the opening Tb of the fuel tank T. The filter F is stored and disposed in a fuel chamber 5 formed inside the storage case 4. In the side wall 4b along the gravity direction XX of the storage case, a first opening 6 is formed in the rear side wall 4b1 in the traveling direction A of the vehicle, and a second opening 7 is formed in the front side wall 4b2. A first check valve 8 that allows fuel flow from the fuel tank T into the fuel chamber 5 and prevents fuel flow from the fuel chamber 5 into the fuel tank T in the first opening 6 and the second opening 7, A second check valve 10 is arranged.
[Selection] Figure 2

Description

  The present invention relates to an in-tank type fuel supply device in which the fuel in a fuel tank is boosted by a fuel pump disposed in the fuel tank, and the boosted fuel is supplied to a fuel injection valve. The present invention relates to a subordinate fuel pump unit device for a motorcycle in which a fuel pump unit device is mounted on the bottom of a fuel tank of a motorcycle.

Patent document 1 exists as a conventional fuel supply device for a motorcycle. Referring to FIG. 3, an opening Tb is formed in the bottom Ta of the fuel tank T so as to open downward, and the opening Tb is closed by the lid member 60. The fuel pump P and the fuel filter F connected to the pump suction path Pa of the fuel pump P are sandwiched and fixed by a lid member 60 and a support member 61 disposed opposite to the lid member 60. When the opening Tb of the fuel tank T is closed, the fuel pump P including the support member 61 and the fuel filter F is inserted and arranged in the fuel tank T, and the pump discharge path Pb of the fuel pump P is provided by the support member. 61, an opening disposed outside the fuel tank T via a discharge passage 62 formed in the lid member 60 and a fuel discharge pipe 63. Also, a bottomed cup-shaped storage case 64 is fitted and disposed on the cylindrical portion 60 a extending upward from the lid member 60, thereby forming a substantially sealed fuel chamber 65 inside the storage case 64. The fuel pump P and the fuel filter F are accommodated in the substantially sealed fuel chamber 65. Further, a fuel supply hole 66 is formed in the side wall 64a along the gravity direction XX of the storage case 64. The fuel supply hole 66 is opened near the bottom portion Ta in the fuel tank T. Drilled. According to the above, the fuel stored in the fuel tank T flows into the fuel chamber 65 through the fuel supply hole 66 due to the head difference and is stored, and when the fuel pump P is driven, the fuel chamber 65 The fuel inside the fuel is removed by the fuel filter F and is sucked into the fuel pump P from the pump suction path Pa. The fuel is discharged to the outside of the fuel tank T through the fuel discharge pipe 63, and the boosted fuel is supplied to a fuel injection valve attached to a fuel distribution pipe (not shown). The fuel is injected and supplied toward
Japanese Patent Application No. 2006-074551

  According to such a conventional fuel supply device for a motorcycle, rapid acceleration operation is performed in a low fuel remaining state in which the remaining amount of fuel in the fuel tank has dropped to the vicinity of the fuel supply hole 66 formed in the storage case 64. When performing a sudden deceleration operation, an operation immediately after, or an operation immediately after a sudden jump operation, there is a risk of breathing in the increase in engine rotation. This is due to the following reason. This will be described with reference to FIG. In this state, the fuel supply hole 66 is formed in the rear side wall 64a with respect to the traveling direction A of the motorcycle. First, when the fuel in the fuel tank T is in a low fuel remaining state and the engine is operating at a constant speed, the fuel level Y1-Y1 in the fuel tank T is above the fuel supply hole 66. It is formed in a substantially horizontal direction. According to the above, the pump suction path Pa of the fuel pump P disposed in the fuel chamber 65 is disposed to open downward in the direction of gravity from the fuel liquid level Y1-Y1, and according to this, the pump suction path Pa The fuel can be continuously sucked into the fuel pump P from Pa, the desired fuel can be continuously supplied from the fuel discharge pipe 63 toward the fuel injection valve (not shown), and the stable engine can be set. High speed operation can be performed. Next, when the engine is suddenly accelerated from the constant speed operation state, the fuel level in the fuel tank T greatly fluctuates from the Y1-Y1 level to the upper right inclined liquid level Y2-Y2. According to this, the fuel stored in the fuel chamber 65 is greatly agitated in the substantially sealed fuel chamber 65 to generate a large fuel flow. In addition, the fuel supply hole 66 is opened to the atmosphere in the fuel tank T, and resistance to the outflow of fuel into the fuel tank T is eliminated. Thus, the fuel stored in the fuel chamber 65 flows out into the fuel tank T through the fuel supply hole 66, and sufficient fuel cannot be held in the fuel chamber 65. According to the above, the fuel supplied from the fuel pump P toward the fuel discharge pipe 63 is reduced, and there is a possibility that a breath of rotation occurs during the rapid acceleration operation. Next, when the engine is suddenly decelerated from the constant speed operation state, the fuel level in the fuel tank T greatly fluctuates from the Y1-Y1 level to the left upward sloping level Y3-Y3. Thus, the fuel stored in the fuel chamber 65 is greatly agitated in the substantially sealed fuel chamber 65 to generate a large fuel flow. In addition, the fuel supply hole 66 is opened to the atmosphere in the fuel tank T and resistance to the outflow of fuel into the fuel tank T is eliminated. Thus, fuel stored in the fuel chamber 65 flows out into the fuel tank T through the fuel supply hole 66, and sufficient fuel cannot be held in the fuel chamber 65. Immediately after the sudden deceleration operation, when attempting to shift to the constant speed operation again, the desired fuel cannot be immediately supplied from the fuel pump P toward the fuel discharge pipe 63. There is a risk of breathing. Next, when a sudden jump operation is performed from the constant speed operation state, the fuel liquid level in the fuel tank T greatly fluctuates from the Y1-Y1 liquid surface state toward the upper surface Tc of the fuel tank T. According to this, the fuel stored in the fuel chamber 65 is greatly agitated in the substantially sealed fuel chamber 65 to generate a large fuel flow. In addition, the fuel supply hole 66 is opened to the atmosphere in the fuel tank T and resistance to the outflow of fuel into the fuel tank T is eliminated. Thus, fuel stored in the fuel chamber 65 flows out into the fuel tank T through the fuel supply hole 66, and sufficient fuel cannot be held in the fuel chamber 65. Then, when trying to shift to the constant speed operation again immediately after the sudden jump operation, the desired fuel cannot be immediately supplied from the fuel pump P to the fuel discharge pipe 63, and the sudden jump operation is not performed. There is a risk of breathing immediately after driving. Such a sudden acceleration operation, a sudden deceleration operation, and a jump operation are often repeated in a motorcycle.

  The present invention has been made in view of such a problem, and in particular, in a motorcycle, even in a sudden acceleration operation, a sudden deceleration operation, a jump operation, etc. performed repeatedly, fuel is constantly and continuously supplied from a fuel pump. It is a main object to provide a subordinate fuel pump unit device for a motorcycle that can be supplied.

  In order to achieve the above object, an undercarriage fuel pump unit device for a motorcycle according to the present invention closes an opening formed in a bottom portion of a fuel tank with a lid member, By attaching a pump, a fuel filter connected to the pump suction path of the fuel pump, and a fuel discharge pipe connected to the pump discharge path of the fuel pump, and closing the opening of the fuel tank with a lid member, In a fuel supply device in which a fuel pump including a fuel filter is inserted and arranged in the fuel tank and the fuel discharge pipe opens to the outside of the fuel tank, the fuel pump and the fuel filter are surrounded by a substantially hermetically sealed outer periphery. By arranging the storage case to be fixed, the fuel pump and the fuel filter are stored in the fuel chamber formed inside the storage case, and the direction of gravity of the storage case is In the side wall, a first opening is formed in the rear side wall in the traveling direction of the vehicle, a second opening is formed in the front side wall, and a fuel tank T is formed in the first opening and the second opening. A first check valve and a second check valve that allow fuel flow from the fuel chamber into the fuel chamber and prevent fuel flow from the fuel chamber into the fuel tank T are provided.

  According to the subordinate fuel pump unit device for a motorcycle of the present invention, the remaining amount of fuel stored in the fuel tank is reduced to the vicinity of the first opening and the second opening formed in the side wall of the storage case. When the operation immediately after the rapid acceleration operation, the rapid deceleration operation, or the rapid jump operation is performed in the low fuel level state with a small amount of remaining fuel, the first opening and the second opening are in the atmosphere in the fuel tank. Even if the fuel in the fuel chamber is greatly stirred and a large fuel flow occurs in the fuel chamber, stable fuel can always be stored in the fuel chamber. Stable fuel can be continuously supplied from the pump to the engine, so that the motorcycle can perform excellent acceleration operation, operation immediately after sudden deceleration operation, and operation immediately after sudden jump operation. It can be.

  Hereinafter, an embodiment of a subordinate fuel pump unit device for a motorcycle according to the present invention will be described with reference to FIG. Reference numeral 1 denotes a lid member that closes an opening formed in the bottom of the fuel tank, which will be described later, and has a flange 1a, a recess 1b that is recessed downward from the flange 1a, and an upward direction from the flange 1a. And a protruding cylindrical portion 1c. Reference numeral 2 denotes a support member that is screwed onto the upper end surface 1d of the lid member 1 and arranged in contact therewith. The electric fuel pump P is sandwiched between the concave portion 1b of the lid member 1 and the support member 2, and the lid member 1 It is placed upright. The fuel pump has a pump suction passage Pa opened downward and a pump discharge passage Pb opened upward. A fuel filter F is inserted and connected to the pump suction passage Pa. Further, the pump discharge passage Pb is inserted and connected to a discharge passage 2a formed in the support member 2, and this discharge passage 2a is erected on the lid member 1 and opens to the outside. 3 is connected to the flow path. Reference numeral 4 denotes a bottomed cup-shaped storage case having an upper bottom portion 4a and a side wall 4b extending downward from the outer periphery of the bottom portion 4a in the gravity direction XX. The lower opening of the side wall 4b of the storage case 4 is inserted and connected to the cylindrical portion 1c of the lid member 1. At this time, the insertion hole 4d formed in the bottom portion 4a and the outer periphery 2d of the support member 2 are arranged. An annular minute gap S is formed between them. According to the above, the substantially sealed fuel chamber 5 is formed inside the storage case 4, and the fuel pump P and the fuel filter F (including the leg portion 2b of the support member 2) are substantially sealed. It is accommodated in the fuel chamber 5. A first opening 6 is formed in the side wall 4b of the storage case 4 and in the vicinity of the lower end of the rear side wall 4b1 (referred to as the right side wall in FIG. 1), and the front side wall 4b2 facing the rear side wall 4b1. A second opening 7 is formed in the vicinity of the lower end of the left side (referring to the left side wall in FIG. 1). The first opening 6 is provided with a first check valve 8 that blocks the flow of fuel flowing out from the fuel chamber 5 and allows the fuel flow from the outside into the fuel chamber 5. . The first check valve 8 is a ball valve, and is disposed in the first opening b so as to face the first valve seat 9 facing the fuel chamber 5. The second opening 7 is provided with a second check valve 10 that prevents the fuel flow that flows out from the fuel chamber 5 toward the outside and allows the fuel flow from the outside into the fuel chamber 5. . The second check valve 10 is a ball valve and is disposed in the second opening 7 so as to face the second valve seat 11 facing the fuel chamber 5. Thus, the fuel pump unit device is formed. The structure of the first and second check valves is not limited to the ball valve but may be a duckbill valve, a reed valve or the like.

  In summary, the fuel pump P and the fuel filter F are housed and disposed in a substantially sealed fuel chamber 5 formed by a housing case 4 disposed above the lid member 1. A first opening 6 having a first check valve 8 and a second opening 7 having a second check valve 10 communicate with the outside.

  The fuel pump unit device is mounted on the bottom of the fuel tank as shown in FIG. T is a fuel tank mounted on the motorcycle body (not shown), and an opening Tb is formed in a bottom portion Ta below the fuel tank. Here, the cylindrical portion 1c of the lid member 1 is inserted and disposed in the opening Tb of the fuel tank T, and the flange portion 1a is brought into contact with the bottom portion Ta of the fuel tank 1, so that the lid member 1 is screwed and fixed to the fuel tank T. According to this, the storage case 4 having the first opening 6 and the second opening 7 and the fuel pump P and the fuel filter F disposed in the storage case 4 are in the fuel tank T and the bottom portion Ta. Is placed close to. When the fuel pump unit device is attached to the fuel tank T, the side wall 4b1 of the storage case 4 and the side wall 4b1 are disposed at the rear C in the traveling direction A of the motorcycle, and the front side wall 4b2 is It is arranged at the front D in the traveling direction A. That is, the rear side wall 4b1 is the rear side wall 4b1 in the traveling direction A of the vehicle, and the front side wall 4b2 is the front side wall 4b2 in the traveling direction A of the vehicle.

  Next, each operation state in the low liquid level state with a small amount of remaining fuel in which the fuel stored in the fuel tank T has decreased to the vicinity of the first opening 6 and the second opening 7 will be described. First, the constant speed operation state will be described. In the fuel tank T, a horizontal fuel liquid level Y1-Y1 is formed. According to this, the fuel in the fuel tank T causes the first check valve 8 to open the first valve seat 9 and the second check valve 10 to open the second valve seat 11 due to the fuel head difference, and the fuel tank. The fuel in T is supplied into the fuel chamber 5, and the fuel in the fuel chamber 5 is sucked into the fuel pump P through the fuel filter F and the pump suction path Pa, and is boosted by the pump portion of the fuel pump P. The fuel is continuously and stably supplied to the engine (not shown) via the discharge passage 2a and the fuel discharge pipe 3, so that the engine can be operated at a good constant speed.

  Next, a description will be given of the sudden acceleration operation. Due to the sudden acceleration operation, the fuel liquid level in the fuel tank T greatly varies from the fuel liquid level Y1-Y1 to the upper right inclined liquid surface Y2-Y2. According to the above, the first opening 6 and the second opening 7 are opened to the atmosphere in the fuel tank T as shown in FIG. 2, and the fuel stored in the fuel chamber 5 is greatly agitated so that the fuel chamber 5 A large fuel flow occurs in the interior. Here, focusing on the fuel stored in the fuel chamber 5, a part of the fuel is released to the atmosphere in the fuel tank T by the inertial force due to the rapid acceleration operation, and from the first opening 6 without resistance to the inside of the fuel tank T. The first check valve 8 closes the first valve seat 9 with its fuel pressure, thereby preventing the fuel from flowing out. On the other hand, the other part of the fuel is opened to the atmosphere in the fuel tank T by the agitation of the fuel in the fuel chamber 5 and flows out from the second opening 7 without resistance toward the atmosphere in the fuel tank T. However, the second check valve 10 closes the second valve seat 11 with the fuel pressure, thereby preventing the fuel from flowing into the fuel tank T. According to the above, since the fuel stored in the fuel chamber 5 can be effectively prevented from flowing out into the fuel tank T during such rapid acceleration operation, sufficient fuel is stored in the fuel chamber 5. The fuel can be continuously stored, so that a stable fuel can be continuously supplied from the fuel pump P to the engine, and a good acceleration operation can be performed. The capacity of the fuel chamber 5 is set appropriately.

  Next, the rapid deceleration operation will be described. Due to the rapid deceleration operation, the fuel liquid level in the fuel tank T largely fluctuates from the horizontal fuel liquid level Y1-Y1 during the constant speed operation to the left upward inclined liquid surface Y2-Y2. According to the above, the first opening 6 and the second opening 7 are opened to the atmosphere in the fuel tank T as shown in FIG. 2, and the fuel stored in the fuel chamber 5 is greatly agitated so that the fuel chamber 5 A large fuel flow occurs in the interior. Here, focusing on the fuel stored in the fuel chamber 5, a part of the fuel is released to the atmosphere in the fuel tank T by the inertia force due to the rapid deceleration operation, and from the second opening 7 without resistance, The second check valve 10 closes the second valve seat 11 with its fuel pressure, thereby preventing the fuel from flowing out. On the other hand, the other part of the fuel is released to the atmosphere in the fuel tank T by the agitation of the fuel in the fuel chamber 5, and flows out from the first opening 6 without resistance toward the atmosphere in the fuel tank T. However, the first check valve 8 closes the first valve seat 9 with the fuel pressure, so that the fuel is prevented from flowing into the fuel tank T. According to the above, during such rapid deceleration operation, the fuel stored in the fuel chamber 5 can be effectively prevented from flowing out into the fuel tank T, and sufficient fuel is continuously supplied into the fuel chamber 5. According to this, immediately after the sudden deceleration operation, for example, the fuel can be continuously supplied from the fuel pump P to the engine even in the constant speed operation. Can be operated satisfactorily.

  Next, the sudden jump operation will be described. The fuel in the vicinity of the bottom portion Ta of the fuel tank T due to the sudden jump operation greatly fluctuates toward the upper surface Tc of the fuel tank T. According to the above, the first opening 6 and the second opening 7 are opened to the atmosphere in the fuel tank T, and the fuel stored in the fuel chamber 5 is greatly stirred so that a large fuel flow is generated in the fuel chamber 5. Arise. Here, paying attention to the fuel stored in the fuel chamber 5, a part of the fuel is released to the atmosphere in the fuel tank T and does not flow out from the first opening 6 without resistance into the fuel tank T. However, since the first check valve 8 closes the first valve seat 9 by its fuel pressure, the outflow of the fuel is prevented. On the other hand, the other part of the fuel is opened to the atmosphere in the fuel tank T and flows out from the second opening 7 without resistance toward the atmosphere in the fuel tank T, but the second check valve 10 By closing the second valve seat 11 with the fuel pressure, the fuel is prevented from flowing into the fuel tank T. According to the above, during such a sudden jump operation, the fuel stored in the fuel chamber 5 can be effectively prevented from flowing out into the fuel tank T, and sufficient fuel is continued in the fuel chamber 5. According to this, fuel can be supplied from the fuel pump P to the engine immediately after a sudden jump operation, for example, at a constant speed, so that the fuel can be supplied rapidly. It is possible to perform the driving immediately after the jump operation.

1 is a longitudinal sectional view of an essential part showing an embodiment of a subordinate fuel pump unit device for a motorcycle according to the present invention. FIG. 2 is a longitudinal sectional view of a main part showing a state in which the undercarriage fuel pump unit device for the motorcycle in FIG. The principal part longitudinal cross-sectional view which shows the fuel supply apparatus for the conventional motorcycles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cover member 4 Storage case 5 Fuel chamber 6 1st opening 7 2nd opening 8 1st check valve 10 2nd check valve F Fuel filter P Fuel pump

Claims (1)

  An opening formed in the bottom of the fuel tank is closed with a lid member, and the lid member is connected to a fuel pump, a fuel filter connected to a pump suction path of the fuel pump, and a pump discharge path of the fuel pump. The fuel discharge pipe is attached, and the fuel tank including the fuel filter is inserted into the fuel tank by closing the opening of the fuel tank with a lid member, and the fuel discharge pipe is directed outside the fuel tank. In the fuel supply device that is opened, the fuel pump P and the fuel filter F are stored in the lid member 1 by fixedly arranging the storage case 4 that surrounds the entire outer periphery of the fuel pump P and the fuel filter F in a sealed manner. The housing 4 is accommodated in a fuel chamber 5 formed inward of the case 4, and the side wall 4 b along the gravity direction XX of the storage case has a rear side wall 4 b in the traveling direction A of the vehicle. In addition, a first opening 6 is drilled and a second opening 7 is drilled in the front side wall 4b2. Further, the fuel flow from the fuel tank T into the fuel chamber 5 is passed through the first and second openings. A subordinate fuel pump unit device for a motorcycle, which is provided with a first check valve 8 and a second check valve 10 which allow and prevent fuel flow from the fuel chamber 5 into the fuel tank T.

Images