JP2918647B2 - Motorcycle - Google Patents

Description

The present invention relates to an in-cylinder injection engine provided with a fuel injection valve for directly injecting fuel into a cylinder, particularly when the engine is mounted on a motorcycle. The present invention relates to an improvement in the arrangement position of the fuel injection valve, which can ensure the cooling property and the maintainability of the fuel injection valve, and can avoid the damage due to an obstacle or the like.

[Conventional technology]

In general, an in-cylinder injection engine is equipped with a fuel injection valve for injecting fuel directly into a cylinder together with compressed air in a cylinder head. Conventionally, this in-cylinder injection engine has been developed as an automobile engine, but recently, attention has been paid to its compactness to mount it on a motorcycle.

[Problems to be solved by the invention]

When the above-mentioned in-cylinder injection engine is mounted on a motorcycle,
It is also necessary to consider that it is not so problematic when mounted on a car. For example, regarding the cooling of the fuel injection valve, in the case of an automobile, since this fuel injection valve is disposed in a substantially closed engine room, it is general to provide a separate cooling device without expecting cooling by traveling wind. It is a target.
However, in the case of a motorcycle, cooling by the traveling wind is expected, and therefore, it is necessary to arrange the motorcycle so that the traveling wind is well applied.

In the case of automobiles, when the hood is opened, the fuel injection valve, spark plug, etc. are exposed upward, so there are not many problems in inspection and maintenance. In the case of motorcycles, the engine is located below the body frame. Therefore, depending on the arrangement position of the fuel injection valve and the like, there is a concern that maintainability may be affected.

Furthermore, in the case of an automobile, since the fuel injection valve is disposed on the upper side in the engine room, there is little problem of interference between the fuel injection valve and the like, for example, an obstacle such as a curb on both sides of the road. However, in the case of a motorcycle, since the engine is exposed to the outside, it is necessary to reliably protect the fuel injection valve from obstacles and the like.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem that is concerned when mounting a fuel injection valve on a motorcycle, and is an automatic vehicle that can ensure cooling performance and maintainability, and can reliably protect from obstacles and the like. It aims to provide motorcycles.

[Means for solving the problem]

The invention according to the first aspect of the present application is provided with a fuel injection valve that arranges a cylinder such that a cylinder axis thereof is located within a range from a front side in a vehicle front-rear direction and a diagonally lower direction to a substantially vertical upper side, and directly injects fuel into the cylinder. In a motorcycle equipped with a crankshaft horizontal type direct injection engine, one of the fuel injection valve and the spark plug is mounted so as to protrude substantially at the center of the cylinder head, and the front and rear of the vehicle from the mounting position of the cylinder head. The fuel injection valve or the spark plug is mounted on a portion extending from the front side to the side in the direction.

Further, the invention of the second aspect is directed to an in-cylinder in which a cylinder axis is arranged so that a cylinder axis is directed forward in a vehicle front-rear direction and lower than a substantially horizontal plane, and a fuel injection valve for directly injecting fuel into the cylinder is provided in a cylinder head. In a motorcycle equipped with an injection engine, the fuel injection valve is located inside the exhaust pipe of the engine in the vehicle width direction and above the lower edge of the exhaust pipe.

[Action]

According to the motorcycle according to the first aspect of the present invention, the cylinder is disposed such that the cylinder axis is located on the front side, and one of the fuel injection valve and the spark plug projects in the center of the cylinder head. , And the other is located at the front half of the surrounding area, so that the traveling wind
It hits both of the spark plugs well, and sufficient cooling performance can be secured. In addition, since both the fuel injection valve and the spark plug are exposed to the front side of the vehicle, inspection and maintenance can be easily performed from the front side of the vehicle, and maintainability can be secured.

According to the motorcycle of the second aspect, the fuel injection valve is located inside the exhaust pipe in the vehicle width direction and above the lower edge of the exhaust pipe, that is, the exhaust pipe serves as a guard member of the fuel injection valve. It can function to prevent hits from falling stones and the like, and obstacles such as curbs interfere with the exhaust pipe before interfering with the fuel injection valve, so that protection from obstacles is ensured.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 to 3 are views for explaining a motorcycle according to one embodiment of the first and second aspects of the present invention. FIG. 1 is a partially sectional left side view around an engine. 2 is a front view, and FIG. 3 is a left side view of the motorcycle. In the present embodiment, the invention described in the first aspect is applied to the air fuel injection device for the upper cylinder, and the second invention is applied to the air fuel injection device for the lower cylinder.

In the drawing, reference numeral 1 denotes a motorcycle according to the present embodiment, and a body frame 2 of the motorcycle 1 has front ends of a pair of left and right main frames 2b welded to a head pipe 2a, and rear ends of the left and right main frames 2b. Left and right rear arm bracket 2c
Are connected by welding. The above head pipe 2a
As a result, a front fork 4 that supports the front wheel 3 at the lower end is rotatably supported to the left and right, and a rear arm 6 that supports the rear wheel 5 at the rear end is pivotally supported vertically by the rear arm bracket 2c. Have been. Reference numeral 7 denotes a fuel tank.

The engine unit 8 is suspended and supported by the vehicle body frame 2. This engine unit 8
Water-cooled 2-cycle V-type 2-cylinder, front case
The cylinder 10 and the lower cylinder 11 are attached to the front case 9b of the front / rear split crankcase 9 including the rear case 9b and the rear case 9a.
The structure is connected with a degree bank angle. The upper cylinder 10 and the lower cylinder 11 have upper and lower cylinder heads 10a and 11a mounted on upper and lower cylinder bodies 10b and 11b, respectively. When viewed from the side, the upper and lower cylinders 10, 11 are inclined upward and downward by 45 degrees, respectively, and when viewed from the front, the upper cylinder 10 is located on the right side.

Further, an intake port 10c for the cylinder formed on the back surface of the upper cylinder 10 is connected to an air cleaner 20 arranged below the fuel tank 7 by an intake duct 20a, and between the two cylinders 10, 11. The formed intake port 11c for the lower cylinder 11 is connected to an air cleaner 19 disposed on the right side of the engine unit 8 through an intake duct 19a.

Further, the exhaust pipe 12 for the upper cylinder 10 is connected to an exhaust port 10d located below the upper cylinder body 10b, extends downward through the left side of the lower cylinder 11, and bends backward here. Being extended rearward on the left side of the vehicle. The exhaust pipe 13 for the lower cylinder 11 is connected to the lower cylinder body 11b.
And extends to the right of the vehicle through the lower side of the crankcase 9 and extends rearward.

At the center of the upper cylinder head 10a, an air fuel injection device 14 is mounted so as to protrude upward on the cylinder axis. The air fuel injection device 14 has a main body 16a containing a valve body 16d for opening and closing the injection nozzle 16c,
A fuel injection valve 16b is fixed to the front wall of the main body 16a, and the injection nozzle 16c is located on the cylinder axis and faces the combustion chamber 10e. 16e is an air rail for supplying compressed air to the main body 16a, and 16f is a fuel rail for supplying fuel to the fuel injection valve 16b. A spark plug 17 is inserted obliquely with respect to the cylinder axis in a portion of the cylinder head 10a in front of the air fuel injection device 14.
These electrodes face the combustion chamber 10d.

At the center of the lower cylinder head 11a, an air fuel injection device 15 having the same structure as that for the upper cylinder is mounted. The spark plug 18 mounted on the cylinder head 11a is located on the rear side of the air fuel injection device 15. The lower air fuel injection device 15 is located inside the exhaust pipe 12 extending from the upper cylinder body 10b in the vehicle width direction, and is located above the lower edge 12a of the exhaust pipe 12.

 Next, the operation and effect of this embodiment will be described.

According to the motorcycle 1 of the present embodiment, the air fuel injection device 14 is protruded from the center of the upper cylinder head 10a, and the ignition plug 17 is mounted on the front side of the cylinder head 10a. Will be
As a result, the traveling wind is good and sufficient cooling performance can be secured. Further, in the air fuel injection device 14, it is desirable that the fuel injection valve 16b be cooled better from the viewpoint of preventing bubbles from being generated in the fuel, but in the present embodiment, the fuel injection valve 16b is positioned in front of the vehicle. It is suitable for cooling.

Inspection and maintenance of the air fuel injection device and the spark plug are performed from the front side or from the side of the vehicle. In the present embodiment, the upper air fuel injection device 14 and the spark plug 17 are provided at the front of the vehicle and at the left side. , And are exposed on the right side, and their maintenance is very good.

In the engine 8 of this embodiment, since the lower cylinder body 11 is slanted downward, the air fuel injection device 15 provided at the tip of the lower cylinder body 11 may be hit by pebbles flipped up by wheels or may be obstructed by curbs or the like. Although the air fuel injection device 15 is located inside the exhaust pipe 12 in this embodiment, there is a concern that the air fuel injection device 15
It functions as a 15 guard member, and can prevent hits such as stepping stones. In addition, since the air fuel injection device 15 is located above the lower edge 12a of the exhaust pipe 12, obstacles such as curbs on the road side may interfere with the air fuel injection device 15 before the lower edge of the exhaust pipe 12.
12a and therefore the air fuel injector 15
Can be reliably protected from obstacles and the like.

〔The invention's effect〕

As described above, according to the motorcycle according to the first aspect of the present invention, the cylinder is arranged so that the cylinder axis is located on the front side, and one of the fuel injection valve and the spark plug projects to the center of the cylinder head. And the other is arranged in the front half of the cylinder head, so that they are exposed to the front of the vehicle. According to the motorcycle according to the second aspect of the invention, since the air fuel injection device is located inside the exhaust pipe and above the lower edge of the exhaust pipe, the exhaust pipe functions as a guard member, This has the effect of protecting the combustion injection valve from obstacles such as flying stones or curbs.

[Brief description of the drawings]

FIGS. 1 to 3 are views for explaining a motorcycle according to an embodiment of the invention of the first and second aspects of the present invention.
FIG. 2 is a partially sectional side view of the engine of the embodiment, FIG. 2 is a front view thereof, and FIG. 3 is a left side view of the motorcycle of the embodiment. In the figure, 1 is a motorcycle, 8 is a direct injection engine,
10 and 11 are upper and lower cylinders, 10a and 11a are cylinder heads, 12
Is an exhaust pipe, 12a is a lower edge of the exhaust pipe, 14 and 15 are air fuel injection devices (fuel injection valves), and 17 is a spark plug.

Claims (2)

(57) [Claims] A cylinder having a fuel injection valve for directly injecting fuel into a cylinder, wherein the cylinder is disposed so that a cylinder axis thereof is positioned in a range of a front side in a vehicle front-rear direction and a diagonally lower direction to a substantially vertical upper side. In a motorcycle equipped with a stationary in-cylinder injection engine, one of the fuel injection valve and the spark plug is mounted so as to protrude substantially at the center of the cylinder head, and from the mounting position of the cylinder head from the front side in the vehicle longitudinal direction from the mounting position. A motorcycle characterized in that one of the fuel injection valve and the spark plug is mounted on a portion extending to the lateral side. 2. An in-cylinder injection engine in which a cylinder is disposed such that a cylinder axis thereof faces forward in a vehicle front-rear direction and lower than a substantially horizontal plane, and a fuel injection valve for directly injecting fuel into the cylinder is provided in a cylinder head. A motorcycle equipped with the fuel injection valve, wherein the fuel injection valve is located inside the exhaust pipe of the engine in the vehicle width direction and above the lower edge of the exhaust pipe.