JP3724184B2 - Fuel injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injection device, and more particularly to an improvement in injector layout of a fuel injection device.
[0002]
[Prior art]
The fuel supply device is classified into a carburetor type and a fuel injection device type. The fuel injection device type includes a type using one injector and a type using two injectors. Although not shown, the type using a single injector pressurizes fuel with a pump and injects the fuel from the injector to the throttle body. Also, in the type using two injectors, as disclosed in Japanese Patent Laid-Open No. 6-117314, the first and second injectors located on the downstream side of the throttle valve are sandwiched between the throttle body and the throttle body. In this state, the first injector is a large-capacity injector positioned near the throttle valve, and the second injector is a small-capacity injector positioned downstream of the first injector.
[0003]
As this type of prior art document, there is JP-A-6-317239 in addition to the above prior art document.
[0004]
[Problems to be solved by the invention]
Conventional fuel injection devices include a type that uses one injector and a type that uses two injectors as described above, but both types have problems. First, in the case of a type that uses a single injector, a large-capacity, large-flow injector must be used. There is a problem that the injection amount cannot be controlled severely. In addition, in the case of a type using two injectors, the first and second injectors are mounted on the top and bottom with the throttle body interposed therebetween, so there is a problem that a plurality of delivery pipes are formed and the installation space is expanded. .
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a fuel injection device capable of accurately controlling a minute fuel injection amount and preventing an increase in the mounting space.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention injects fuel into the intake passage, and has a V-type two-cylinder engine in which the cylinder is shifted in the front-rear direction and a combustion chamber of a plurality of cylinders of the V-type two-cylinder engine. An intake passage to be connected; a delivery pipe positioned between the plurality of intake passages; and a pair of injectors that are supplied with fuel from the delivery pipe and inject fuel into the intake passage of each cylinder;
A pair of injectors are inclined at a predetermined angle in the front-rear direction with respect to the axis of the throttle body at one side of the throttle body constituting a part of each intake passage, and are arranged side by side. The included angle α formed by the injector is set to an angle of 5 ° to 25 ° in plan view with the axis SL of the intake passage as a center, and the length l between the tip injection ports of the pair of injectors is D / 4 of the diameter D of the intake passage. The fuel injection angle of the injector is approximately equal to the included angle α, and the intersection K where the outer edge of the inner peripheral wall of the intake passage and the fuel injection angle intersect is downstream of the throttle body downstream edge. It is characterized in that a pair of injectors are provided together on a delivery pipe provided between the front and rear throttle bodies.
[0008]
Here, the pair of injectors in the claims can be selectively used as appropriate according to the low rotation and middle / high rotation of the engine, in other words, according to the air flow rate. V-type engines are classified into a plurality of types according to the number of cylinders and the like, but any type may be used. Further, the fuel injection device can be appropriately used not only for an engine of a motorcycle such as an on-road vehicle, but also for an engine of an automobile, an outboard motor, a lawn mower, a boat, a water bike, or the like.
[0009]
According to the present invention, since a pair of injectors are used for one intake passage, the injector can be miniaturized and its longitudinal length can be shortened. Further, since the pair of injectors are provided side by side so as to form an included angle α of 5 ° to 25 ° with respect to the intake passage, a layout in which fuel does not collide with the inner wall of the intake passage can be obtained. In addition, with this layout, the delivery type can be unified, and expansion of the installation space can be expected.
Further, the inner wall of the air intake passage, a fuel collision difficult layout is obtained. Further, since delivery pipes and the like are arranged between the throttle bodies in the plurality of cylinders of the V-type two-cylinder engine, the space between the plurality of throttle bodies can be used effectively.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 12, the fuel injection device in the present embodiment includes a suction device 4 and a fuel supply device 5, and the suction device 4 and the fuel supply device 5 are the V-type engine 6 of the motorcycle 1. It is installed on the top of.
[0011]
The motorcycle 1 includes a diamond type frame 2 having high rigidity, and a steering mechanism 3, a suction device 4, a fuel supply device 5, a V-type engine 6, and a cooling device 7 are arranged on the front portion of the frame 2. A rotary damper type suspension 8 and a muffler 9 are respectively disposed at the rear (see FIG. 4).
[0012]
As shown in FIGS. 1, 3, and 4, the steering mechanism 3 includes a front fork 2a that is penetrated and supported by a head pipe at the front end of the frame 2, and a handle 10 or the like is mounted on the top of the front fork 2a. In the lower part of the front fork 2a, a front fender 11, a rotatable front tire 12, and a part of a front brake device 13 are disposed. In the vicinity of the periphery of the steering mechanism 3, a screen 14 and a fairing 15 for improving the maneuverability and stability of the V-type engine 6 in the high speed range are respectively located.
[0013]
As shown in FIGS. 1 and 4, the suction device 4 includes an air cleaner chamber 17 that introduces traveling air from the air ducts 16 on both sides of the fairing 15 through a control valve. A pair of throttle bodies 18 are attached to the throttle body 18, and a throttle valve 18 a is rotatably supported on each throttle body 18. The suction device 4 configured in this manner functions to pressurize the air cleaner chamber 17 with the ram pressure generated by the traveling wind to increase the intake efficiency and improve the output.
[0014]
As shown in FIGS. 6 and 7, the fuel supply device 5 includes a fuel tank 19 mounted and installed from the front to the center of the upper portion of the frame 2, and pressurizes the fuel inside the fuel tank 19. A fuel pump 20 is built in, and a fuel hose 21 of the fuel pump 20 is connected to delivery pipes 23, 23 via a fuel inlet 22, and a pair of injectors 24 are provided in parallel on the delivery pipes 23, 23. (A total of four in this embodiment). A return hose 25 is connected to the fuel pump 20, and the return hose 25 and the delivery pipe 23 are connected via a regulator 26.
[0015]
As shown in FIGS. 8 to 12, the pair of injectors 24 are inserted side by side on one side of the throttle body 18 in the front-rear direction, but are connected to the axis SL of each throttle body 18. It tilts forward or backward at an angle of 30 ° and is located downstream of the throttle valve 18a. The pair of injectors 24 are inclined and arranged so as to approach each other from the end toward the tip injection ports P ₁ and P _2, and are sandwiched by 20 ° in plan view around the axis SL of the throttle body 18. An angle (relative angle) α is formed. The length l between the tip injection ports P ₁ and P _{2 of the} pair of injectors 24 is a length within the range of D / 4 to D / 2 of the diameter D of the throttle body 18 (D = φ49 in this embodiment). That's it. Further, the included angle α is set substantially equal to the injection angle of the injector 24.
[0016]
As shown in FIG. 12 and the like, each injector 24 includes a case 27, a needle valve 28, a plunger 29, a solenoid coil 30, and a spring in which the outer diameter of the tip injection port is about φ10 and the body portion is about φ15. 31 is a small capacity type with a small injection amount. Then, in response to an injection signal from a control unit (not shown), the solenoid coil 30 is actuated to raise the needle valve 28 integral with the plunger 29, the tip injection port is opened, and pressurized fuel is injected into the throttle body 18. Is done.
[0017]
As shown in FIGS. 5 and 6, the V-type engine 6 is a V-type 2-cylinder engine in which the first cylinder 32 and the second cylinder 33 are shifted by 90 ° in the front-rear direction, for example, below the center portion of the frame 2. It is mounted on. The first cylinder 32 and the second cylinder 33 of the V-type engine 6 are respectively provided with an intake port and an exhaust port communicating with the combustion chamber, and an intake manifold 34 communicating with the throttle body 18 is formed in each intake port. An exhaust pipe 35 is connected to each exhaust port, and a muffler 9 is connected to the exhaust pipe 35. Between the throttle body 18 of the first cylinder 32 and the second cylinder 33, the delivery pipe 23 and its peripheral devices are located.
[0018]
As shown in FIGS. 5 and 6, the cooling device 7 is a forced circulation type using a water pump, and a radiator 36 is attached to the front portion of the first cylinder 32 that faces the front, and at the rear portion of the radiator 36. There is an electric fan installed. The V-type engine 6 and the cooling device 7 are covered with a plurality of covers 37 that cover both the left and right sides of the frame 2.
[0019]
As shown in FIGS. 2 to 4, the suspension 8 includes a swing arm 38 that is pivotally supported via a damper at the lower rear of the frame 2. The swing arm 38 has a rotatable rear tire 39. And a part of the rear brake device 40 are respectively disposed. A cover 41 that covers the upper portion of the frame 2 is mounted above the swing arm 38, and a front seat 42 and a pillion seat 43 are mounted and installed side by side on the upper portion of the cover 41. Further, a sprocket 44 is fitted on the rear shaft of the rear tire 39, and an endless drive chain 46 is wound between the sprocket 44 and the sprocket 45 of the V-type engine 6. In addition, mufflers 9 are attached to both sides of the rear portion of the frame 2 so as to be inclined through fasteners.
[0020]
In the above configuration, when the fuel pump 20 of the fuel supply device 5 constituting the fuel injection device is operated, the fuel in the fuel tank 19 (see the arrow in FIG. 7) is the fuel filter, the fuel pump 20, the fuel hose 21, and the fuel inlet 22. And the delivery pipe 23 are sequentially supplied to the pair of injectors 24 and then injected into the throttle body 18 from the tip injection ports P ₁ and P _{2 of the} injector 24. At this time, for the pair of injectors 24, only one of the injectors 24 is used when the V-type engine 6 rotates at a low speed, and both injectors 24 are used when the V-type engine 6 rotates at a medium to high speed. Further, when the pressure value becomes higher than a certain value, the fuel sequentially passes through the delivery pipe 23, the regulator 26, and the return hose 25 and is returned to the fuel pump 20 to maintain the pressure.
[0021]
According to the above configuration, since a pair of injectors 24 is used for one throttle body 18 instead of a single injector 24, it is possible to reliably prevent the injector 24 from becoming large and having its longitudinal length increased. Further, in the low-speed region of the V-type engine 6, since only one small-capacity injector 24 having a small injection capacity is used, it is possible to control severely even with a small injection amount. In addition, a layout in which fuel does not collide with the inner peripheral wall of the intake manifold 34 can be obtained very easily.
[0022]
This effect will be described in detail while comparing FIG. 10 and FIG. FIG. 13 shows a conventional example in which the axis SL of the throttle body 18 and the pair of injectors 24 are improperly arranged. In this figure, since the axis SL of the throttle body 18 and the tip injection ports P ₁ and P _{2 of} the pair of injectors 24 are parallel in plan view, the inner peripheral wall of the throttle body 18 of the spray injected from each injector 24 The distance between the intersection K where the outer edge on the side facing the inner wall intersects the inner peripheral wall and the tip injection ports P ₁ and P ₂ of the injector 24 are close to each other. It will go back to the inner wall.
[0023]
On the other hand, according to the present embodiment, the outer edge portion of the inner peripheral wall is substantially parallel to the axis SL of the throttle body 18 in plan view, and the intersection K intersecting the inner peripheral wall and the tip injection port of the injector 24. The distance between P ₁ and P ₂ increases and the velocity of the fuel particles attenuates. Therefore, the direction of the fuel particles is changed to the air flow, so that the fuel particles do not easily collide with the inner peripheral wall. In addition, the fuel particles on the side where the sprays of the pair of injectors 24 face each other collide with each other, the speed is attenuated, and the fuel particles hardly collide with the inner peripheral wall.
[0024]
In the present embodiment, the diameter D of the throttle body 18 is φ49, the outer diameter of the tip injection port of the case 27 of the injector 24 is about φ10, and the body portion of the case 27 is about φ15, so the tip injection ports P of the pair of injectors 24 _1, the length l between the P ₂ does not become a 13mm or less. However, it is preferable that the length l between the tip injection ports P ₁ and P ₂ is short. Therefore, if the length 1 between the tip injection ports P ₁ and P ₂ is shortened and the included angle α of the pair of injectors 24 is appropriately selected, a layout that does not cause the intersection K to collide with the inner peripheral wall of the intake manifold 34 can be obtained. Can do. This layout can be obtained by shortening the length l between the tip injection ports P ₁ and P ₂ to increase the included angle α, and increasing the length l between the tip injection ports P ₁ and P _2. And a method of reducing the included angle α.
[0025]
Moreover, since the delivery pipe 23 can be unified by the above-described layout, it is not necessary to install the delivery pipe 23 in a state where the pair of injectors 24 are sandwiched therebetween, and it can be easily expected that the installation space is not enlarged. Further, since the delivery pipe 23, peripheral devices of the delivery pipe 23, and fasteners thereof are arranged between the throttle bodies 18 of the first cylinder 32 and the second cylinder 33 of the V-type engine 6, The space between the throttle bodies 18 can be used very effectively, and a great reduction in weight and space can be achieved.
[0026]
【The invention's effect】
As described above, according to the present invention, the V-type two-cylinder engine in which the cylinder is shifted in the front-rear direction, the intake passages respectively connected to the combustion chambers of the plurality of cylinders of the V-type two-cylinder engine , and the plurality of intake air A delivery pipe located between the passages, and a pair of injectors that are supplied with fuel from the delivery pipe and inject the fuel into the intake passages of the cylinders,
A pair of injectors are inclined at a predetermined angle in the front-rear direction with respect to the axis of the throttle body and arranged side by side on one side of the front-rear direction of the throttle body constituting a part of each intake passage. Is defined as an angle of 5 ° to 25 ° with respect to the axis SL of the intake passage, and the length l between the tip injection ports of the pair of injectors is D / 4 to D of the diameter D of the intake passage. The fuel injection angle of the injector is substantially equal to the included angle α, and the intersection K where the outer edge of the inner peripheral wall of the intake passage intersects the fuel injection angle is downstream of the throttle body downstream edge. because provided along each pair of injectors to the delivery pipe provided between the front and rear of the throttle body, by shortening the longitudinal length of the injector, suppressing prevent child enlargement of installation space There is an effect that it is.
In addition, a layout in which fuel does not collide with the inner wall of the intake passage can be obtained. Furthermore, since the delivery pipes and the like are arranged between the throttle bodies in the plurality of cylinders of the V-type two-cylinder engine, there is an effect that the space between the plurality of throttle bodies can be effectively used.
[Brief description of the drawings]
FIG. 1 is a front view showing a motorcycle in an embodiment of a fuel injection device according to the present invention.
FIG. 2 is a rear view showing the motorcycle in the embodiment of the fuel injection device according to the present invention.
FIG. 3 is a plan view showing a motorcycle in an embodiment of a fuel injection device according to the present invention.
FIG. 4 is a side view showing a motorcycle in the embodiment of the fuel injection device according to the present invention.
FIG. 5 is a front view showing a V-type engine in an embodiment of a fuel injection device according to the present invention.
6 is a side view of FIG. 5. FIG.
FIG. 7 is a system explanatory diagram showing a fuel supply device in an embodiment of a fuel injection device according to the present invention.
FIG. 8 is an explanatory plan view showing an embodiment of a fuel injection device according to the present invention.
FIG. 9 is an explanatory side view showing an embodiment of a fuel injection device according to the present invention.
FIG. 10 is a perspective explanatory view showing an embodiment of a fuel injection device according to the present invention.
FIG. 11 is an explanatory view showing an attachment state of the injector in the embodiment of the fuel injection device according to the present invention.
FIG. 12 is a cross-sectional explanatory view showing an injector in an embodiment of a fuel injection device according to the present invention.
FIG. 13 is an explanatory view showing an example in which an injector is improperly attached to a throttle body.
[Explanation of symbols]
1 Motorcycle 2 Frame 3 Steering mechanism 4 Suction device 5 Fuel supply device 6 V-type engine 7 Cooling device 8 Suspension 9 Muffler 17 Air cleaner chamber 18 Throttle body (part of intake passage)
18a Throttle valve 19 Fuel tank 20 Fuel pump 21 Fuel hose 22 Fuel inlet 23 Delivery pipe 24 Injector 25 Return hose 26 Regulator 27 Case 32 First cylinder (cylinder)
33 No. 2 cylinder (cylinder)
34 Intake manifold (part of intake passage)
35 Exhaust pipe D Diameter of throttle body l Length P ₁ between tip injection ports of a pair of injectors, P ₂ Tip injection ports SL of a pair of injectors Axis α Angle

Claims (1)

In a fuel injection device for injecting fuel into an intake passage, a V-type two-cylinder engine having cylinders shifted in the front-rear direction, an intake passage connected to combustion chambers of a plurality of cylinders of the V-type two-cylinder engine, A delivery pipe positioned between the intake passages and a pair of injectors that are supplied with fuel from the delivery pipe and inject the fuel into the intake passages of the cylinders,
A pair of injectors are inclined at a predetermined angle in the front-rear direction with respect to the axis of the throttle body at one side portion of the throttle body constituting a part of each intake passage, and are arranged side by side. The included angle α formed by the injector is set to an angle of 5 ° to 25 ° in plan view around the axis SL of the intake passage, and the length l between the tip injection ports of the pair of injectors is D / 4 of the diameter D of the intake passage. The fuel injection angle of the injector is approximately equal to the included angle α, and the intersection K where the outer edge of the inner peripheral wall of the intake passage and the fuel injection angle intersect is downstream of the throttle body downstream edge. A fuel injection device characterized in that a pair of injectors are provided together on a delivery pipe provided between the front and rear throttle bodies.

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