JP2004338606A - Two wheeler with kick starting mechanism, and engine with injector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-sized displacement fuel pump with high boosting efficiency. <P>SOLUTION: This innovention comprises a motor with an outer rotor structure including a stator 12 and a bobbin-like rotor 13 rotating around it, a discoid impeller 10 connected to the rotary shaft 15 of the motor, having a blade part 85 formed along the vicinity of the outer edge, and partition plate 20 arranged between the rotor 13 and the impeller 10, having a recessed fuel induction passage 86 formed at a position opposed to the blade part 85, which is in a surface opposed to the impeller 10. The partition plate 20 is provided with a flange 21 erected to be opposed to the side face of the impeller 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motorcycle and an engine with an injector, and more particularly to a motorcycle and an engine with an injector provided with a kick starter.
[0002]
2. Description of the Related Art There are known two types of fuel pumps for vehicles: a pressure type pump typified by a Wesco type (impeller type) and a positive displacement type pump typified by a trochoid gear type or a roller type. I have.
[0003]
The pressure type pump is a pump that sucks and discharges fuel by rotating an impeller (impeller) in a pump casing, for example, since the volume of the pump chamber does not change, the discharge pressure pulsation is small, and low noise and low vibration are generated. There is an advantage that is.
[0004]
On the other hand, the positive displacement pump increases and decreases the volume of the pump chamber around the suction port and the discharge port by the rotation of the rotating member, and sucks and discharges the fuel. Vibration is larger than that of the pressure pump, but a predetermined discharge amount can be obtained even when the rotation speed of the rotating member is low. Therefore, there is an advantage that the pump efficiency is higher than that of the pressure type pump. Such a positive displacement fuel pump is disclosed in JP-A-5-332257.
[0005]
On the other hand, in a small two-wheeled vehicle, an engine is usually started by rotating a starter motor by a charging voltage of an on-vehicle battery.However, a small battery is generally used. Starting, that is, kick starting is enabled. A motorcycle provided with a kick starting mechanism is disclosed in Japanese Patent Application Laid-Open No. Hei 3-18660.
[0006]
[Problems to be solved by the invention]
When a kick starter is mounted on a vehicle that supplies fuel to the injection by a fuel pump, the electric power obtained by the kick is temporary.If the fuel pump is of a pressure type, the fuel to be supplied to the injector is sufficiently increased. Can not press. For this reason, there has been a technical problem that a predetermined amount of fuel cannot be injected from the injector, and kick startability is reduced.
[0007]
In addition, when the distance between the fuel pump and the fuel tank or the distance between the fuel pump and the injector is increased, the suction resistance and the discharge resistance are increased. Therefore, there is a technical problem that the pressure of the fuel supplied to the injector cannot be kept high.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a two-wheeled vehicle equipped with a kick start mechanism and an engine with an injector that can supply sufficiently pressurized fuel to the injector even at the time of kick start. It is in.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a motorcycle with a kick start mechanism and an engine with an injector provided with a kick start mechanism that drives an engine and a generator with a kick force. There are features.
[0010]
(1) The fuel supply device includes a kick start mechanism for driving an engine and a generator with a kick force and a positive displacement fuel pump, and the positive displacement fuel pump is housed in a fuel tank.
[0011]
(2) The motorcycle includes a positive displacement fuel pump, an injector supplied with fuel from the positive displacement fuel pump, and a fuel tank containing the positive displacement fuel pump therein, wherein the fuel tank is a low-floor step floor of the vehicle. It is characterized by being arranged below.
[0012]
(3) The motorcycle is characterized in that the engine is arranged near the rear of the fuel tank and the fuel pump is arranged on the engine side in the fuel tank.
[0013]
(4) The fuel pump of the two-wheeled vehicle is disposed substantially on the same line in the front-rear direction with the injector as viewed from above the vehicle.
[0014]
(5) The fuel pump and the injector of the motorcycle are arranged so as to be offset to one side from the center line in a top view of the vehicle.
[0015]
(6) The fuel pipe connecting the positive displacement fuel pump and the injector continuously rises from the positive displacement fuel pump toward the injector.
[0016]
At the start of the kick, the output voltage of the generator instantaneously rises but immediately falls. Here, in the pressure type pump, there is a time lag until the fuel pressure is sufficiently increased even if the impeller starts rotating by applying the driving voltage. Therefore, when the driving voltage is applied only for a short time, such as when starting a kick, the fuel cannot be sufficiently pressurized.
[0017]
On the other hand, in a positive displacement pump, when a driving voltage is applied and a motor is driven, the fuel pressure immediately rises, and a sufficient amount of fuel can be injected from the injector. In addition, according to the above features (1) and (2), since the positive displacement pump is housed in the fuel tank and the fuel suction resistance can be kept low, the fuel pressure rises sharply immediately after the kick start. be able to. Therefore, even when the remaining battery power is insufficient, the kick startability of the engine is improved.
[0018]
According to the above feature (3), since the distance between the fuel pump and the engine can be reduced, the distance between the injector and the fuel pump can also be reduced. Therefore, the pressure of the fuel supplied to the injector can be kept high.
[0019]
According to the above feature (4), the distance between the fuel pump and the injector can be sufficiently secured in the front-rear direction of the vehicle body while the distance between the fuel pump and the injector is kept short.
[0020]
According to the above-mentioned feature (5), even when the fuel level decreases due to a decrease in fuel, the oil level can be substantially raised by tilting the vehicle body to the one side, so that the fuel level remains in the fuel tank. The fuel that is being pumped can be reliably sucked by the fuel pump.
[0021]
According to the above configuration (6), the downstream side from the arrival end of the fuel is always filled with the fuel in the fuel pipe, so that the air bleeding property in the fuel pipe is improved.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external side view of a scooter type motorcycle according to the present invention, in which a vehicle body front portion 1 and a vehicle body rear portion 2 are connected via a low floor portion 3.
[0023]
The front body portion 1, the rear body portion 2 and the floor portion 3 are covered with a front cover 4, a body cover 5 and a step floor cover 6, respectively. Above the front part 1 of the vehicle body, a steering wheel 7 is supported by a steering head. A front fork 8 extends below the front part 1 of the vehicle body, and a front wheel 9F is pivotally supported at a lower end thereof.
[0024]
The swing unit 20 is swingably connected and supported via a link member 18. A four-cylinder four-cycle engine 13 is mounted at the front of the swing unit 20. A kick pedal 19 for starting the engine when the battery voltage drops is connected to the crankshaft of the engine 13. A belt-type continuously variable transmission 21 is formed from the engine 13 to the rear, and a rear wheel 9R is pivotally supported by a reduction mechanism 14 provided at a rear portion thereof via a centrifugal clutch. A rear cushion 15 is interposed between the upper end of the speed reduction mechanism 14 and the main pipe.
[0025]
The upper part of the handle 7 is covered with a handle cover 10 also serving as an instrument panel. The steering head, the front fork 8 and the handle 7 constitute steering means. A grip portion of the handle 7 protrudes from the handle cover 10 toward the left and right of the vehicle body, and a side mirror 11L (11R) is mounted above. The handle lock module 12 locks the handle 7 to disable steering.
[0026]
A seat 16 is provided above the body cover 5 so as to cover the storage box. The seat 16 can be opened and closed, and a helmet or the like can be stored in a storage box below the seat 16. The rear part of the body cover 5 is provided with a number plate mounting portion 17, a carrier 28, a tail lamp 29, and the like. An intake pipe, a carburetor, an air cleaner, and the like are also provided in association with the engine 13, but are not shown here.
[0027]
Under the step floor cover 6, a fuel tank 31 is mounted in front of the engine 13, and a positive displacement fuel pump 32 is housed in the fuel tank 31. A fuel cap 34 is attached to a filler port of the fuel tank 31. The positive displacement fuel pump 32 has a built-in drive motor (not shown), and uses the power of the drive motor to increase or decrease the capacity of a plurality of volume chambers of the trochoid pump, thereby displacing the strainer 33 from the fuel tank 31. The fuel is sucked through the fuel pipe and supplied to the injector 36 of the engine through the fuel pipe 35.
[0028]
As described above, if the trochoid pump is employed as the positive displacement fuel pump 32, the discharged fuel does not return to the trochoid pump side even if the kick is repeated intermittently, so that the startability of the engine is improved even with a small number of kicks. be able to.
[0029]
Further, in the present embodiment, the fuel pipe 35 connecting the positive displacement fuel pump 32 and the injector 36 continuously rises from the positive displacement fuel pump 32 toward the injector 36 without descending. . In this manner, the fuel pipe 35 is always filled with fuel on the downstream side from the arrival end of the fuel, so that not only the air bleeding property in the fuel pipe 35 is improved but also the fuel discharged stepwise is prevented. Thus, continuous ejection becomes possible after the first ejection.
[0030]
FIG. 2 is a partial perspective view of the scooter-type motorcycle viewed from above, and the same reference numerals as those described above denote the same or equivalent parts.
[0031]
In the present embodiment, the fuel tank 31 and its refueling cap 34 are arranged at the center in the left-right direction of the vehicle body, while the fuel pump 32 housed inside the fuel tank is arranged offset to the left side of the vehicle body. Then, the fuel discharged from the fuel pump 34 is supplied to the injector 36 via the fuel pipe 35 routed to the left side of the vehicle body in the same manner as the offset direction of the fuel pump 32.
[0032]
As described above, in this embodiment, since the fuel pump 32 is disposed in the fuel tank 31 so as to be offset to one side from the center line in the top view of the vehicle, when the fuel level decreases and the oil level decreases. However, if the vehicle body is tilted to the one side, the oil level can be substantially raised. Therefore, the fuel remaining in the fuel tank can be reliably sucked by the fuel pump.
[0033]
Further, in the present embodiment, the fuel pump 32 and the injector 36 are arranged on the same line when viewed from above the vehicle, so that the distance between them can be sufficiently secured in the front-rear direction of the vehicle body while keeping the distance between them shortest. become.
[0034]
FIG. 3 shows the elapsed time t and the fuel pressure since the drive voltage was supplied to the fuel pump by kick start with respect to the fuel supply system (A) according to the present invention and the fuel supply system (B) employing the conventional pressure pump. It is a figure showing the relation with Kpa.
[0035]
In the present embodiment, a positive displacement pump is adopted as the fuel pump 32, and the fuel pump 32 is accommodated in the fuel tank 31 to reduce the fuel supply resistance. Therefore, the fuel pressure rises sharply immediately after the kick start compared to the related art. Can be raised. Therefore, even when the remaining battery power is insufficient, the startability of the engine at the time of a kick start can be improved.
[0036]
FIG. 4 is an external side view of a second embodiment of a scooter type motorcycle according to the present invention, and the same reference numerals as those described above denote the same or equivalent parts.
[0037]
The present embodiment is characterized in that the engine 13 is arranged near the rear of the fuel tank 31 and the fuel pump 32 is arranged inside the fuel tank 31 on the engine 13 side. According to the present embodiment, since the distance between the fuel pump 32 and the engine 13 can be further reduced, the discharge resistance of the fuel pump 32 can be further reduced.
[0038]
【The invention's effect】
According to the present invention, the following effects are achieved.
(1) Since a positive displacement pump is adopted as the fuel pump and is accommodated in the fuel tank to reduce the fuel supply resistance, the fuel pressure can rise sharply immediately after the kick start compared to the prior art. . Therefore, even when the remaining battery power is insufficient, the startability of the engine at the time of a kick start can be improved.
(2) The distance between the fuel pump and the engine can be shortened because the fuel pump is arranged close to the engine in the fuel tank. Therefore, the distance between the injector and the fuel pump can be shortened, and as a result, the pressure of the fuel supplied to the injector can be kept high.
(3) Since the fuel pump is disposed in the fuel tank so as to be offset to one side from the center line in a top view of the vehicle, even when the fuel level decreases and the oil level decreases, the vehicle body is moved to the one side. If it is tilted, the oil level can be raised substantially, so that the fuel remaining in the fuel tank can be reliably sucked by the fuel pump.
(4) Since the fuel pump and the injector are arranged on the same line when viewed from above the vehicle, it is possible to secure a sufficient distance between the two in the longitudinal direction of the vehicle body while keeping the distance between them short.
(5) The fuel pipe connecting the positive displacement fuel pump and the injector is continuously raised from the positive displacement fuel pump toward the injector, so that the fuel pipe always fills the downstream side from the fuel arrival end in the fuel pipe. As a result, air bleeding in the fuel pipe is improved.
[Brief description of the drawings]
FIG. 1 is an external side view of a scooter type motorcycle according to the present invention.
FIG. 2 is a partial perspective view of the motorcycle of FIG. 1 as viewed from above.
FIG. 3 is a diagram showing a change in fuel pressure between the present invention and the prior art.
FIG. 4 is an external side view of a second embodiment of the scooter type motorcycle according to the present invention.
DESCRIPTION OF SYMBOLS 4 front cover, 5 body cover, 6 step floor cover, 7 handle, 8 front fork, 13 4 cycle engine, 14 reduction mechanism, 18 link member, 19 kick pedal, Reference Signs List 20: swing unit, 31: fuel tank, 32: positive displacement fuel pump, 33: strainer, 34: fuel cap, 35: fuel pipe, 36: injector

Claims (7)

In an engine equipped with a fuel supply device that sucks fuel from a fuel pump and supplies the fuel to an injector,
A kick starting mechanism that drives the engine and the generator with kick force;
A positive-displacement fuel pump that includes a motor driven by electric power generated by the generator, and that increases / decreases the capacity of a volume chamber with the motor to suction / discharge fuel;
An engine with an injector, wherein the positive displacement fuel pump is accommodated in a fuel tank. The engine with an injector according to claim 1, wherein a fuel pipe connecting the positive displacement fuel pump and the injector rises continuously from the positive displacement fuel pump toward the injector. In a motorcycle equipped with a kick starting mechanism that drives an engine and a generator with kick force,
A positive displacement fuel pump including a motor driven by electric power generated by the generator, and increasing / decreasing a capacity of a volume chamber by the motor to suck / discharge fuel;
An injector supplied with fuel from the positive displacement fuel pump,
A fuel tank containing the positive displacement fuel pump therein,
A motorcycle with a kick start mechanism, wherein the fuel tank is disposed below a low floor step floor of the vehicle. The two-wheeled vehicle with a kick start mechanism according to claim 3, wherein the engine is arranged near the rear of the fuel tank, and the fuel pump is arranged on the engine side in the fuel tank. The two-wheeled vehicle with a kick start mechanism according to claim 3 or 4, wherein the fuel pump is disposed substantially on the same line in the front-rear direction as the injector when viewed from above the vehicle. The two-wheeled vehicle with a kick start mechanism according to any one of claims 3 to 5, wherein the fuel pump and the injector are arranged offset to one side from a center line in a top view of the vehicle. The motorcycle with a kick start mechanism according to any one of claims 3 to 6, wherein a fuel pipe connecting the positive displacement fuel pump and the injector rises continuously from the positive displacement fuel pump toward the injector. .

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