JPS641197Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a carburetor arrangement structure for a motorcycle.
In particular, the present invention relates to a carburetor arrangement structure for a motorcycle having a multi-cylinder engine.

Some motorcycles equipped with multi-cylinder engines have a structure in which each cylinder is provided with an independent carburetor. In such a case, the mounting direction of each cylinder is determined only by physical constraints such as the vehicle body structure and the engine mounting position, and therefore, the cylinders are generally mounted facing various different directions.

On the other hand, since the carburetor itself is extremely sensitive to dynamic pressure, negative pressure, temperature, air volume, etc., engine characteristics are greatly influenced by these various parameters. Therefore, in a multi-cylinder engine in which each cylinder is provided with an independent carburetor, it is desirable to arrange the carburetors under the same conditions as much as possible.

The present invention was developed in view of the above points, and its purpose is to improve the characteristics of a multi-cylinder engine in a motorcycle by arranging the carburetors in substantially the same mounting position. The purpose of the present invention is to provide a vaporizer array structure.

The carburetor arrangement structure of this invention is characterized in that the air intake holes of the carburetors, which are independently provided for each cylinder of a multi-cylinder engine, are all arranged in approximately the same direction and toward the front of the vehicle body.

The present invention will be explained below using the drawings.

FIG. 1 is a side view of a motorcycle showing an embodiment of the present invention, and FIG. 2 is a front view of only the multi-cylinder engine as seen from the front of the vehicle in FIG. In FIG. 1, 1 is a steering head, 2 is an upper frame, and 3 is a down frame.
These frames 2 and 3 have a so-called double cradle frame structure each consisting of two tubes mounted symmetrically with respect to the steering head 1, but the present invention is not limited to this. A multi-cylinder, for example, three-cylinder engine 4 and a crankcase 5 are provided within the space defined by the double cradle frame, and these are attached to the frame by a known method.

Two cylinders 6 of each of these cylinders 6, 7 and 8
and 7 are installed in the engine 4 in such a way that they are arranged in parallel with each other in the same horizontal plane with their cylinders facing substantially upward, and the remaining one cylinder 8 is arranged downwardly relative to the two cylinders 6 and 7. The cylinders are arranged so that their cylinders are located midway between the front and the bottom (toward the ground) of the vehicle, and their details are shown in the second section.
As shown in the figure. By doing this, it becomes possible to arrange all the air intake holes 9, 10, and 11 of each carburetor, which are independently attached to each cylinder 6, 7, and 8, toward the front direction of the vehicle body. .
In addition, each exhaust pipe of the frame cylinders 6 and 8 is connected to 1 in Fig. 1.
2 and 14, and the exhaust pipe of the cylinder 7 is also arranged in parallel with the exhaust pipe 12 of the cylinder 6 (not shown in the figure).

With such a structure, the air intake holes of all the carburetors are arranged in the same direction and almost facing the front of the vehicle body, which reduces dynamic pressure, negative pressure, temperature, air volume, etc. The conditions are the same, and all the carburetors are set and arranged under the same conditions.

Furthermore, as shown in the front view of FIG. 3, only one carburetor cover 15 can be used to adjust dynamic pressure due to running wind and to prevent collisions with foreign objects, which is extremely advantageous in terms of design and cost.

As mentioned above, according to the present invention, all the carburetor intake holes of a multi-cylinder engine are installed under almost the same conditions, so the characteristics of the engine are improved and the carburetor cover is unified. This has the advantage of being possible.

[Brief explanation of drawings]

Figure 1 is a side view of a motorcycle according to an embodiment of the present invention, Figure 2 is a front view of only the engine part seen from the front of the vehicle body in Figure 1, and Figure 3 is the engine part when the carburetor cover is attached. FIG. Explanation of symbols of main parts, 4...Multi-cylinder engine, 6, 7, 8...Cylinder, 9, 10, 11...Air intake hole, 15...Carburetor cover.

Claims (1)

[Scope of utility model registration request] A carburetor array structure for a motorcycle having a carburetor independently provided for each cylinder of a multi-cylinder engine, wherein each air intake hole of the carburetor is oriented in substantially the same direction and substantially toward the front of the vehicle body. A structure characterized by being arranged towards the.