JP2004076728A - Engine for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the appearance while protecting the injector of an engine having a cylinder head protruded in a vehicle body lateral direction. <P>SOLUTION: The injector is housed in a mounting block 42 integrally formed with an intake manifold 41. A noise-proof cover 45 entirely covers a feed terminal (plug) protruded laterally from the injector and a coupler connected to the plug. The noise-proof cover 45 is closely fitted to a fuel distribution pipe 47 for supplying fuel and the intake manifold 41 while commonly covering the top parts of a plurality of injectors to prevent the leak of sounds. Further, this engine has a cover 50 for covering the mounting block 42 of the intake manifold 41, the noise-proof cover 45 and the fuel distribution pipe 47 to improve the appearance in addition to sound insulation. The cover 50 is preferably formed of a hard material. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motorcycle engine, and more particularly to a motorcycle engine suitable for protecting an injector and its power supply portion and improving the appearance.
[0002]
[Prior art]
The fuel injector (injector) of the engine injects fuel into the intake pipe (intake manifold) by opening and closing the electromagnetic valve at a high speed. When the valve comes into contact with the valve seat as the engine rotates. A tapping sound occurs. An engine provided with an injection valve chamber for accommodating an injection valve has been proposed in order to prevent the tapping sound, that is, the operation sound from leaking to the outside (JP-A-63-100269). Also, unlike a motor vehicle in which the entire engine is housed in an engine room, in a motorcycle in which the engine is exposed, the operating sound of the injector is more likely to leak. In view of this, there have been proposed engines in which the injectors are laid out in a space surrounded by peripheral components to achieve soundproofing (JP-A-11-82163, JP2938204, etc.).
[0003]
[Problems to be solved by the invention]
The layout in which the peripheral parts surround the injector is advantageous when the injector is arranged near the center in the width direction of the vehicle body. However, when it is difficult to obtain a layout that appropriately surrounds the periphery of the injector with peripheral parts, particularly in the case of a horizontally opposed engine or a V-type vertical engine (a plurality of cylinders are vertically opened in the longitudinal direction of the vehicle body and a plurality of cylinders are opened in a V shape in the width direction of the vehicle body). ), The injector is disposed on the outermost side in the width direction of the vehicle body. Therefore, there is no peripheral component that can surround the injector, or even if there is no peripheral component, it is not possible to form a space that enhances the soundproofing effect because the number is small. In addition, since a cover that covers the injector disposed at the outermost side of the vehicle body has a large effect on the appearance, there has been a demand for soundproof means that is well-organized and has a good appearance.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a motorcycle engine that solves the above problems, has a high sound insulation effect, has a good appearance, and is useful for protecting the injector and its surroundings.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an injector attached to an intake pipe at a predetermined angle, a fuel supply pipe connected to a top of the injector, and an injector provided between the intake pipe and the fuel supply pipe. In a motorcycle engine having a power supply terminal for use and a coupler coupled to the power supply terminal for the injector, a cover that covers the injector, the power supply terminal for the injector, and the coupler, and faces outward in the vehicle width direction is provided. There is a first feature in the provision. Further, the present invention has a second feature in that the cover is made of a hard material.
[0006]
According to the first feature, the fuel supply pipe is located above the injector, and the injector, the power supply terminal, and the coupler are covered with the cover facing outward in the vehicle width direction, so that the injector and the like are protected and the appearance is excellent. Become.
[0007]
According to the second feature, the periphery of the injector is covered with the hard material cover, so that the protection function is further improved.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a side view showing the appearance of a motorcycle equipped with an engine with an injector soundproof cover according to one embodiment of the present invention, and FIG. 3 is a front view of the essential part. In the figure, a motorcycle (hereinafter referred to as “vehicle”) 1 is equipped with a horizontally opposed six-cylinder engine 2. The cylinder head 2a of the engine 2 is located outside in the width direction of the vehicle body, and the injector 40 is attached to the intake manifold 41 near the cylinder head 2a.
The frame of the vehicle 1 is composed of a twin frame type main frame 4 extending bifurcated right and left from the steering head 3 to the rear of the vehicle, and a rear frame 5 coupled rearward from the main frame 4. A front fork 6 composed of two pipes arranged on the left and right in the running direction is pivotally supported on the steering head 3 so as to be steerable, and a handle 7 is fixed to an upper portion thereof, that is, a top bridge. A front wheel 9 is rotatably supported by a front wheel shaft 8 provided at a lower end of the front fork 6.
[0009]
A display device including a display panel and a control unit, that is, a meter unit 10 is provided in front of the handle 7. In front of a front fairing (cowl) 11 that covers a front portion of the vehicle 1, a lens 12 of a lighting device including a clear lens is mounted. A booster (ballast) 13 for a discharge lamp used as a lighting device is accommodated in the front cowl 11. A windshield 14 is provided on the upper part of the front cowl 11, and an air inlet 15 is formed near a mounting portion of the windshield 14.
[0010]
A fuel tank 16 is provided on the main frame 4, and a driver seat 17 and a passenger seat 18 are arranged on the rear frame 5 behind the fuel tank 16. The passenger seat 18 is formed integrally with the driver seat 17 and has a backrest 19. Behind the backrest 19, a rear trunk 20 is provided. At the rear of the rear trunk 20, a rear stop lamp 21 and a turn signal light 22 are provided. A side trunk 23 is provided below the rear trunk 20 and on the left and right sides of the rear wheel 26, and another set of rear stop lamps 24 and turn signal lights 25 is provided at the rear.
[0011]
An air cleaner 27 is provided in a lower front part of the fuel tank 16, and an intake manifold 29 extends downward from a throttle body 28 provided in front of the air cleaner 27. The intake manifold 29 is connected to each of three cylinders disposed on the left and right sides of the vehicle body so as to face each other, and an injector 40 is provided for each of these cylinders. The injector 40 is covered with a soundproof cover also serving as a cover for the power supply connector, the details of which will be described later. An exhaust manifold 30 is drawn rearward from the engine 2, and the exhaust manifold 30 is connected to a muffler 31.
[0012]
Both lower sides of the driver's seat 17 are covered with side covers 32, and a front lower cowl 33 is disposed in front of the engine 2. A relay box 36 is provided below the driver seat 17 along the rear fender 37. The relay box 36 is mounted on the rear fender 37.
[0013]
A battery 38 is provided below the relay box 36 on the left side of the vehicle body, and a fuse box 39 is provided in front of the battery 38. The battery 38 is mounted on a support frame suspended from the rear frame 5, and the fuse box 39 is screwed to the support frame.
[0014]
A rear cushion 34 is further provided below the driver's seat 17. The rear cushion 34 is electrically connected to a hydraulic unit (not shown) capable of adjusting a spring force by electric power and adjusting an initial load of the suspension according to the weight of the driver. The vehicle 1 can be made independent using the stand 35.
[0015]
Next, the configuration around the engine head including the injector will be described. FIG. 4 is a perspective view of a main part around the engine head. In the figure, the tip of an intake manifold 41 branched into three corresponding to the number of cylinders is connected to an injector mounting block (hereinafter simply referred to as a “mounting block”) extending along the direction in which cylinders (not shown) are arranged. ) 42. The intake manifold 41 and the mounting block 42 can be formed integrally.
[0016]
Three injectors 40 are mounted on the mounting block 42 in accordance with the number of cylinders. The injector 40 is mounted such that the fuel outlet is directed toward the center of the intake manifold 41, and the fuel supply port 40 a at the top protrudes upward from the mounting block 42. An O-ring 40b is provided around the fuel supply port 40a, and a fuel distribution pipe described later is attached to the fuel supply port 40a by the O-ring 40b in a state of maintaining liquid tightness.
[0017]
The injector 40 is provided with a power supply plug (described later), and the coupler 43 is coupled to the plug. A conductor constituting a wire harness is connected to the terminal 43a of the coupler 43 (described later). Further, a fuel hose 44 that is connected to a fuel distribution pipe described later and supplies fuel extends in the same direction as the intake manifold 41.
[0018]
FIG. 5 is a perspective view of a main part around an engine head in a state where a soundproof cover is attached to the coupler 43. In the figure, a soundproof cover 45 is put on each coupler 43 (see FIG. 7). The soundproof cover 45 completely covers the coupler 43, and is preferably an elastic soft heat-resistant rubber such as chloroprene rubber or silicon rubber. The soundproof cover 45 has a skirt portion 45a that covers the side surface of the coupler 43, and the front surface and the back surface (the surface on the intake manifold side) orthogonal to the skirt portion 45a are formed so as to be in close contact with the fuel distribution pipe and the outer periphery of the intake manifold 41, respectively. Is done. The tube portion 45b above the soundproof cover 45 has a cylindrical shape so as to be in close contact with the outer shape of the wire harness. As described above, the soundproof cover 45 is in close contact with the coupler so as to completely cover the whole, so that the operation sound of the injector 40 can be cut off, and the waterproof and dustproof effects can also be exhibited.
[0019]
FIG. 1 and FIG. 6 are perspective views of main parts around an engine head with a fuel distribution pipe attached, respectively, as viewed from the center of the vehicle body and viewed from the side of the vehicle body. In both figures, a fuel distribution pipe 46, which is a fuel supply pipe having a fuel distribution function, is a long block extending in the direction in which the three injectors 40 are arranged, and has a fuel passage (not shown) extending in the length direction. Then, the fuel passage is attached so as to be coupled to the fuel supply port 40a of each injector 40. The fuel distribution pipe 46 is fixed to the mounting block 42 with three bolts 47. The fuel hose 44 is connected to the side of the fuel distribution pipe 46 from the intake manifold 41 side. As described above, the top of the injector 40 exposed from the mounting block 42 is covered with the fuel distribution pipe 46, and the plug on the side protruding to the outside, that is, the power supply terminal is covered by the soundproof cover 45 that is in close contact with the fuel distribution pipe 46. Since it is covered, there is no exposed portion to the outside.
[0020]
FIG. 7 is a cross-sectional view of the injector mounting portion. In the figure, an intake manifold 41 including a mounting block 42 is mounted on an engine head 49.
The injector 40 is mounted in the hole of the mounting block 42 while maintaining the liquid tightness by the O-ring 40c. The fuel supply port 40a side is inserted into the hole 46a of the fuel distribution pipe 46 while maintaining the liquid tightness by the O-ring 40b. A plug 40d as a power supply terminal extends to the side of the injector 40, a coupler 43 is coupled to the plug 40d, and a conductor 48a of a wire harness 48 is coupled to a terminal 43a of the coupler 43. The soundproof cover 45 covers the coupler 43, and a tube portion 45 b extending upward is in close contact with the wire harness 48.
[0021]
Although the soundproof cover 45 has a large effect of blocking the operation sound of the injector 40, an outer cover 50 that covers the injector 40, the coupler 43, the soundproof cover 45, and the fuel distribution pipe 46 can be provided. The outer cover 50 can have a function of protecting the coupler 43 and the injector 40 facing the outermost side in the width direction of the vehicle body and a function of improving the appearance. From this viewpoint, the outer cover 50 is preferably made of a hard material such as metal, aramid fiber, or melamine resin, and more preferably a decorative cover having a highly productive design by plating or painting.
[0022]
In the above-described embodiment, an engine having a horizontally opposed cylinder has been described as an example of a vertical engine whose output shaft extends in the front-rear direction of the vehicle body. However, the present invention is not limited to the one in which the cylinders are horizontally opposed to each other, and can be suitably used for an engine of a type in which the cylinder head projects outward in the vehicle width direction and the intake manifold is connected from above the syringe head. It is not limited to the opposing one.
[0023]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the present invention, the injector, the injector power supply terminal, and the coupler are covered by the cover facing outward in the vehicle width direction, and thus are protected. In addition, the cover can enhance the aesthetic appearance and enhance the commercial value. Further, according to the invention of claim 2, the protection effect can be enhanced by the cover made of the hard material.
[Brief description of the drawings]
FIG. 1 is an external perspective view of the vicinity of an injector of an engine according to an embodiment of the present invention.
FIG. 2 is a side view of a motorcycle equipped with an engine according to one embodiment of the present invention.
FIG. 3 is a front view of a main part of the motorcycle of FIG. 2;
FIG. 4 is a perspective view of the periphery of the injector with the injector exposed.
FIG. 5 is a perspective view around an injector with a soundproof cover attached.
FIG. 6 is a perspective view of the periphery of an injector of the engine according to the embodiment of the present invention, as viewed from the opposite side of FIG.
FIG. 7 is a sectional view around an injector.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Engine, 5 ... Rear frame, 11 ... Front fairing, 14 ... Windshield cover, 40 ... Injector, 41 ... Intake manifold, 42 ... Mounting block, 43 ... Coupler, 45 ... Soundproof cover, 46 ... Fuel distribution pipe, 50 ... outer cover

Claims (2)

An injector attached to the intake pipe at a predetermined angle, a fuel supply pipe coupled to the top of the injector, an injector power supply terminal provided between the intake pipe and the fuel supply pipe, and coupled to the injector power supply terminal; A motorcycle engine having a coupler and
A motorcycle engine, comprising: a cover that covers the injector, the injector power supply terminal, and the coupler and that faces outward in the vehicle width direction. The motorcycle engine according to claim 1, wherein the cover is made of a hard material.

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