JP4281921B2 - Fuel supply apparatus and vehicle equipped with the same - Google Patents

Abstract

The present invention relates to a Vehicle comprising an introduction port, through which air is introduced to an intake chamber, an intake passage, which includes an opening opened into the intake chamber and through which an air in the intake chamber is led from the opening to an engine, fuel feed device having an injector that jets a fuel toward the opening from between the introduction port and the opening in the intake chamber, and a tubular jet protection member arranged between the injector and the opening in the intake chamber to protect a fuel jetted from the injector and passing therethrough toward the opening.

Description

  The present invention relates to a fuel supply device that supplies fuel to an engine and a vehicle including the same.

  Conventionally, a so-called fuel injection type engine provided with an injector (injector) is known. Normally, this type of engine includes an intake passage from the air cleaner toward the combustion chamber of the engine, and an injector (hereinafter referred to as a downstream injector) provided on the downstream side of the intake passage. However, since the downstream injector is disposed at a position close to the combustion chamber, the fuel injected from the downstream injector may flow into the engine without being sufficiently atomized.

  On the other hand, a fuel supply device in which an injector is provided upstream of the intake passage is also known (see, for example, Patent Documents 1 and 2 below). In the fuel supply devices disclosed in Patent Documents 1 and 2, the upstream opening of the intake passage opens in the air cleaner, and the injector (hereinafter referred to as upstream injector) is provided at a position away from the opening in the air cleaner. Yes.

According to the fuel supply devices disclosed in Patent Documents 1 and 2, the engine performance is improved by using the upstream injector, for example, by compensating the fuel injection amount that is insufficient only by the downstream injector with the upstream injector. .
Japanese Patent Laid-Open No. 10-196494 Japanese Patent Laid-Open No. 2004-1000063

  By the way, when the upstream injector is arranged, for example, the fuel injected from the upstream injector is scattered outside the intake passage due to the turbulence of the air flow in the air cleaner (hereinafter, this phenomenon is referred to as “spilling”). Must be considered. Therefore, as a method for suppressing spillage, it is conceivable to suppress the amount of fuel injected from the upstream injector.

  However, if the amount of fuel injected from the upstream injector is suppressed, the amount of fuel supplied to the combustion chamber may be insufficient. For this reason, it is difficult to sufficiently improve the engine performance.

  The present invention has been made in view of this point, and an object thereof is to suppress fuel spillage from the upstream injector while sufficiently improving engine performance.

A fuel supply apparatus according to the present invention includes an intake chamber having an introduction portion for introducing air, an intake passage having an opening portion that opens into the intake chamber, and guides air in the intake chamber from the opening portion to an engine; An injector for injecting fuel into the intake chamber from between the introduction portion and the opening in the intake chamber toward the opening, and a shaft between the injector and the opening in the intake chamber A tubular member that is movably disposed in a direction and allows fuel injected from the injector to pass toward the opening, and the tubular member moves to a position closest to the injector. The injector injects fuel into the intake chamber.

  According to the fuel supply device, the jet flow from the injector is surrounded by the tubular member. Therefore, fuel spillage is suppressed by the tubular member. Therefore, even if the injector and the opening of the intake passage are not brought close to each other, blowing up can be suppressed. Therefore, according to the fuel supply device, it is possible to achieve both fuel atomization promotion and prevention of spillage.

  According to the present invention, fuel spillage from the injector can be suppressed while sufficiently improving engine performance.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the motorcycle 100 includes an air intake 1 for taking in air, an air cleaner 5, an engine 13, and a muffler 17. The air intake 1 and the air cleaner 5 are connected via an intake duct 3. The air cleaner 5 and the combustion chamber 13c (see FIG. 2; not shown in FIG. 1) of the engine 13 are connected via an intake passage 9. The combustion chamber 13 c and the muffler 17 are connected via an exhaust passage 15. An upstream injector 7 is disposed inside the air cleaner 5, and a downstream injector 11 is disposed in the intake passage 9. The engine 13 is a parallel 4-cylinder engine, and four intake passages 9 are provided along the vehicle width direction (the front and back direction in FIG. 1).

  As shown in FIG. 2, the fuel supply apparatus according to this embodiment includes an air cleaner 5, an upstream injector 7, a cylinder 23, a second funnel 25, an intake passage 9, and a downstream injector 11.

  The air cleaner 5 includes a bowl-shaped lower case 4 that opens upward, and a bowl-shaped upper case 2 that opens downward. The upper case 2 and the lower case 4 are coupled in a state where the peripheral edges of each other are abutted. Thereby, the intake chamber 12 is defined inside the upper case 2 and the lower case 4. Inside the intake chamber 12, an element 8 for removing dust and impurities contained in the air is disposed.

  An introduction port 10 for introducing air is formed on the front side of the lower case 4 (left side in FIG. 2). Further, four through holes 22 arranged in the vehicle width direction are formed in the rear portion of the bottom surface of the lower case 4.

  As described above, the four intake passages 9 arranged in the vehicle width direction are formed in the engine. Each intake passage 9 includes a first funnel 24 fitted in the through hole 22, a throttle body 26 fitted in the first funnel 24, a joint member 36 connected to the downstream end of the throttle body 26, and a joint member 36. And an intake port 13f connected to the downstream end of the. The first funnel 24 opens in the intake chamber 12 and forms an opening of the intake passage 9. A throttle valve 28 is provided inside the throttle body 26.

  The intake port 13f communicates with the combustion chamber 13c. An intake valve 13b driven by an intake cam 13a is disposed in the intake port 13f. An exhaust passage 15 (not shown in FIG. 2; see FIG. 1) is also communicated with the combustion chamber 13c. An exhaust port (not shown) of the exhaust passage 15 is provided with an exhaust valve 13e driven by an exhaust cam 13d.

  A mounting portion 26b to which the downstream injector 11 is attached is formed at a portion downstream of the throttle valve 28 in the throttle body 26. The downstream injector 11 is attached to the attachment portion 26 b, and the nozzle 11 a of the downstream injector 11 extends toward the inside of the intake passage 9. Therefore, the downstream injector 11 injects fuel downstream of the throttle valve 28.

  A separate chamber cover 14 is attached to the inner surface side of the rear portion of the upper case 2. A separate chamber 16 is defined between the separate chamber cover 14 and the upper case 2, and the upstream injector 7 is disposed in the separate chamber 16. However, the nozzle 7 a of the upstream injector 7 passes through the separate chamber cover 14 and extends to the intake chamber 12. The upstream injector 7 is arranged to inject fuel toward the inside of the first funnel 24.

  A support base 18 that protrudes obliquely upward is formed on the bottom surface of the rear portion of the lower case 4. A support bar 19 that extends parallel to the opening direction of the first funnel 24 is attached to the support base 18. A support plate 20 extending in the vehicle width direction (the front and back direction in FIG. 2) is fixed to the upper end portion of the support bar 19 with bolts 21. As shown in FIG. 4, four second funnels 25 arranged in the vehicle width direction are fixed to the support plate 20.

  Similar to the first funnel 24, the second funnel 25 is made of a tubular member whose upstream end is formed in a bell mouth shape. In the present embodiment, the inner diameter of the second funnel 25 is substantially equal to the inner diameter of the first funnel 24. Further, the outer diameter of the second funnel 25 is substantially equal to the outer diameter of the first funnel 24. However, the inner diameter or outer diameter of the first funnel 24 and the second funnel 25 may be different from each other.

  The second funnel 25 is disposed between the nozzle 7 a of the upstream injector 7 and the upstream end of the first funnel 24. Further, the second funnel 25 is disposed on an extension line of the first funnel 24. That is, the second funnel 25 is arranged coaxially with the first funnel 24. The second funnel 25 is disposed at a position away from the first funnel 24, and a gap is formed between the upstream end of the first funnel 24 and the downstream end of the second funnel 25.

  An aluminum cylinder 23 is inserted inside the second funnel 25. This cylinder 23 is also disposed between the nozzle 7 a of the upstream injector 7 and the upstream end of the first funnel 24. Further, the cylinder 23 is arranged coaxially with the first funnel 24 and the second funnel 25. The length of the cylinder 23 is approximately equal to the distance between the upstream end of the first funnel 24 and the upstream end of the second funnel 25.

  As will be described later, the cylinder 23 is movable in the axial direction. Specifically, the cylinder 23 moves between a position where the lower end is fitted into the first funnel 24 (see FIG. 2) and a position where the lower end is separated from the first funnel 24 (see FIG. 3). .

  The outer diameter of the cylinder 23 is substantially equal to the inner diameter of the second funnel 25. Therefore, a gap is not substantially formed between the cylinder 23 and the second funnel 25. Therefore, the cylinder 23 is movable in the axial direction, but the cylinder 23 and the second funnel 25 are continuous.

  Further, the outer diameter of the cylinder 23 is substantially equal to the inner diameter of the first funnel 24. Therefore, when the cylinder 23 is fitted into the first funnel 24, the cylinder 23 and the first funnel 24 are continuous. Regardless of the position of the cylinder 23, the cylinder 23 and the second funnel 25 are continuous. Therefore, when the cylinder 23 is fitted into the first funnel 24, the first funnel 24 and the second funnel 25 are continuous via the cylinder 23, and the intake path is longer than the intake passage 9.

  In a state where the cylinder 23 is separated from the first funnel 24, the upstream end of the first funnel 24 becomes the open end of the intake passage. On the other hand, when the cylinder 23 is fitted in the second funnel 25, the upstream end of the second funnel 25 becomes the open end of the intake path. Hereinafter, a state in which the cylinder 23 is separated from the first funnel 24 (see FIG. 3) is referred to as a short state, and a state in which the cylinder 23 is fitted in the first funnel 24 (see FIG. 2) is referred to as a long state. In addition, the cylinder 23 and the 2nd funnel 25 in a short state respond | correspond to the tubular member of this invention.

  As described above, the cylinder 23 is located between the nozzle 7 a of the upstream injector 7 and the first funnel 24. The nozzle 7 a is disposed obliquely above the upstream end of the cylinder 23. Specifically, the nozzle 7 a is disposed at a position away from the upstream end of the cylinder 23 by a predetermined distance in the axial direction of the cylinder 23. The nozzle 7 a is disposed at the center of the opening of the cylinder 23 when viewed from the axial direction of the cylinder 23. That is, the nozzle 7 a injects fuel from the position away from the upstream end of the cylinder 23 toward the center of the cylinder 23. The fuel injected from the nozzle 7 a passes through the cylinder 23 and flows into the intake passage 9. Thus, the cylinder 23 is disposed at a position for guiding the fuel injected from the upstream injector 7 to the intake passage 9.

  In the short state (see FIG. 3), the cylinder 23 projects obliquely upward from the second funnel 25. In the present embodiment, the nozzle 7a is located obliquely above the upper end of the cylinder 23 in the short state. Therefore, the nozzle 7a always injects fuel to a position that is obliquely upward from the cylinder 23.

  Further, the nozzle 7 a injects the fuel so as to spread on the upstream side of the upstream end of the cylinder 23. Such an injection mode can be easily realized by appropriately setting the diameter of the nozzle 7a, the distance of the nozzle 7a from the cylinder 23, the injection direction of the nozzle 7a, the injection speed, and the like.

  Next, the moving mechanism 40 that moves the cylinder 23 will be described. As shown in FIG. 4, a connecting rod 27 extending in the vehicle width direction is attached to the cylinder 23. The connecting rod 27 passes through each cylinder 23 and connects the four cylinders 23. As shown in FIG. 2, groove holes 29 extending in the axial direction of the second funnel 25 are formed on both sides of the second funnel 25 in the vehicle width direction. The connecting rod 27 is disposed in the slot 29.

  A central portion in the longitudinal direction of the connecting rod 27 is rotatably supported at one end of a lever 30 extending in the front-rear direction (left-right direction in FIG. 2). The other end of the lever 30 is provided with a cam receiving roller 31 protruding sideways. A cam 32 and a motor 33 that rotates the cam 32 are disposed on the other end side of the lever 30. The cam 32 is disposed above the cam receiving roller 31 and is in contact with the cam receiving roller 31. A midway portion of the lever 30 is rotatably supported by a support shaft 34, and a spring 35 that pulls the other end side of the lever 30 upward is attached to the rear side of the support shaft 34.

  When the other end side of the lever 30 is pulled upward by the spring 35, the cylinder 23 is pushed down obliquely downward. As a result, the cylinder 23 is fitted into the first funnel 24, and the intake path is in a long state. On the other hand, when the cam 32 rotates and pushes down the other end of the lever 30, the cylinder 23 is pushed up obliquely upward. As a result, the cylinder 23 is disengaged from the first funnel 24, and the intake path is short-circuited.

  Reference numeral 60 denotes a controller that performs injection control of the upstream injector 7 and the downstream injector 11 and control of the moving mechanism 40.

  Next, the fuel supply operation by the fuel supply apparatus will be described.

  The air introduced from the inlet 10 of the air cleaner 5 is purified by the element 8 and then sucked into the intake passage 9. At this time, if the intake path is in a long state, air is sucked from the second funnel 25. On the other hand, if the intake path is in a short state, air is sucked from the first funnel 24. Specifically, a part of the air passes through the second funnel 25 and the cylinder 23 and then is sucked into the first funnel 24, and the other air passes through the gap between the first funnel 24 and the second funnel 25. Inhaled by 24.

  In the intake stroke of the engine 13, the intake valve 13b is opened by the intake cam 13a, and fuel is injected from at least one of the upstream injector 7 and the downstream injector 11.

  The fuel injected from the upstream injector 7 passes through the second funnel 25 and the inside of the cylinder 23 and flows into the intake passage 9 from the first funnel 24. The fuel flowing in from the first funnel 24 is supplied to the combustion chamber 13c through the throttle body 26 and the intake port 13f.

  According to the present embodiment, when the intake passage is in a short state, the cylinder 23 suppresses fuel spillage from the upstream injector 7. That is, even if the fuel injected from the upstream injector 7 scatters outward due to the turbulence of the air flow in the air cleaner 5, the fuel adheres to the inner peripheral surface of the cylinder 23 and is then sucked into the intake passage 9. Therefore, there is little possibility that the scattered fuel will be blown out. Therefore, it is possible to achieve both fuel atomization promotion and prevention of spillage, and fuel spillage can be suppressed while sufficiently improving engine performance.

  The inner diameter of the upstream end of the cylinder 23 is larger than the outer diameter of the nozzle 7a. Therefore, when fuel is injected from the nozzle 7a, air flows from between the edge of the upstream end of the cylinder 23 and the outer periphery of the nozzle 7a. Thereby, the spread of the fuel injected from the nozzle 7a is suppressed by the inflow air. Therefore, spillage is suppressed. Moreover, the atomization of fuel is promoted by the inflow air.

  Further, according to the present embodiment, the outer diameter of the downstream end of the cylinder 23 is smaller than the inner diameter of the upstream end of the first funnel 24. Therefore, there is no possibility that the fuel that has flowed downstream from the cylinder 23 will be scattered outside the first funnel 24, and the spillage is further suppressed.

  Since the upstream end of the second funnel 25 is formed in a bell mouth shape, if the second funnel 25 is used instead of the cylinder 23 as a tubular member for preventing spillage (see FIG. 5), the inflow air Can be guided smoothly, and the inflow of air can be promoted. Moreover, according to the 2nd funnel 25, since air can be suck | inhaled from a comparatively wide range, scattering of injected fuel can be suppressed by inflow air, and blowing-out can be suppressed more effectively. According to the example shown in FIG. 5, since the upstream side of both the tubular member (in this case, the second funnel 25) and the intake passage 9 is formed in a bell mouth shape, the effect of smoothly guiding air is great.

  Further, according to this embodiment, when the intake path is in a short state, the cylinder 23 and the first funnel 24 are completely separated. Therefore, compared with the case where the cylinder 23 and the first funnel 24 are partially connected, a large opening area of the intake passage 9 can be secured, and the intake performance can be kept good.

  In the above embodiment, the cylinder 23 that moves in the axial direction with respect to the second funnel 25 is provided, and the cylinder 23 constitutes a tubular member for preventing spillage. However, the tubular member is not limited to a movable member, and may naturally be stationary at a fixed position.

  Further, the tubular member is not limited to a round tube but may be a square tube. When the tubular member or the like is other than a circular tube, the diameter means a hydraulic diameter. Furthermore, the tubular member is not limited to a tube having a constant inner diameter, and may be a tube whose inner diameter changes along the axial direction. For example, the tubular member may have a conical shape or a pyramid shape. Further, as long as the fuel can be smoothly guided to the intake passage 9, it may be slightly curved.

  In the above embodiment, the nozzle 7 a of the upstream injector 7 is separated obliquely upward from the upstream end of the cylinder 23. However, as shown in FIG. 6, the nozzle 7 a may enter the inside of the tubular member 50. As a result, fuel spillage is further suppressed.

  In the above embodiment, the cylinder 23 and the first funnel 24 are separated when the intake path is short-circuited. However, for example, as shown in FIG. 7, the tubular member 50 and the intake passage 9 may be partially connected. That is, the tubular member 50 and the intake passage 9 may be integrated. Note that the connection mode between the tubular member 50 and the intake passage 9 is not particularly limited.

  Moreover, as shown in FIG. 8, the tubular member 50 and the intake passage 9 may be integrated, and the opening 51 may be formed in a bell mouth shape. Thereby, the inflow of air from the opening 51 can be smoothed.

  In addition, the engine of the said embodiment was provided with the upstream injector 7 and the downstream injector 11, and was a so-called twin injector type engine. However, the engine according to the present invention may include only the upstream injector 7.

  In the above embodiment, the upstream injector 7 is arranged inside the air cleaner 5. However, the upstream injector 7 may be disposed outside the air cleaner 5 as long as it injects fuel into the intake chamber 12.

  The vehicle according to the embodiment is a motorcycle 100. However, the vehicle according to the present invention is not limited to a motorcycle. The motorcycle here includes a so-called motorbike and a scooter.

  As described above, the present invention is useful for a fuel supply device and a vehicle including the same.

1 is a side view of a motorcycle. It is sectional drawing of a fuel supply apparatus. It is sectional drawing of a fuel supply apparatus. It is an internal top view of a fuel supply apparatus. It is a conceptual diagram showing a part of fuel supply device concerning a modification. It is a conceptual diagram showing a part of fuel supply apparatus which concerns on another modification. It is a conceptual diagram showing a part of fuel supply apparatus which concerns on another modification. It is a conceptual diagram showing a part of fuel supply apparatus which concerns on another modification.

Explanation of symbols

5 Air cleaner 7 Upstream injector (injector)
7a Nozzle (nozzle part)
9 Intake passage 10 Introduction port (introduction part)
12 Intake chamber 13 Engine 23 Cylinder (tubular member)
24 First funnel (opening)
25 Second funnel (tubular member)
100 Motorcycle (vehicle)

Claims (9)

An intake chamber having an introduction section for introducing air;
An intake passage having an opening that opens into the intake chamber, and guides air in the intake chamber from the opening to the engine;
An injector that injects fuel into the intake chamber from between the introduction portion and the opening in the intake chamber toward the opening;
A tubular member that is movably disposed in the axial direction between the injector and the opening in the intake chamber, and that allows fuel injected from the injector to pass toward the opening ;
The fuel supply device , wherein the injector injects fuel into the intake chamber even when the tubular member moves to a position closest to the injector . The tubular member has a downstream end located on the intake passage side,
The fuel supply device according to claim 1, wherein an outer diameter of the downstream end is smaller than an inner diameter of the opening of the intake passage. The tubular member has an upstream end located on the injector side;
The injector has a nozzle part formed with an injection port for injecting fuel,
The fuel supply device according to claim 1, wherein an inner diameter of an upstream end of the tubular member is larger than an outer diameter of the nozzle portion.   The fuel supply device according to claim 3, wherein the upstream end of the tubular member is formed in a bell mouth shape. The injector has a nozzle part formed with an injection port for injecting fuel,
The fuel supply device according to claim 1, wherein the nozzle portion is surrounded by the tubular member.   The fuel supply device according to claim 1, wherein the tubular member and the intake passage are separated.   The fuel supply device according to claim 1, wherein the opening portion of the intake passage is formed in a bell mouth shape. The tubular member has an upstream end located on the injector side;
The fuel supply device according to claim 1, wherein the upstream end of the tubular member and the opening of the intake passage are both formed in a bell mouth shape.   A vehicle comprising the fuel supply device according to claim 1.

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