JPS6193231A - Supercharged internal-combustion engine for motorcycle - Google Patents

Abstract

PURPOSE:To get apparatuses constituting a suction system together in one spot and set up it in a compact manner, by setting up a surge tank and a carburetor in an empty space on top of a cylinder head extending horizontally, while installing a supercharger solidly in a crankcase as one body. CONSTITUTION:A cylinder head 2 is installed in the front of a crankcase 3 so as to extend horizontally, while a surge tank 4 is set up in an upper part of the cylinder head 2. A carburetor 5 is set up as getting closer to the obliquely right lower part of the surge tank 4, and an air cleaner is set up in an obliquely upper part behind an internal-combustion engine body 1 and that on the top of the crankcase 3, there is provided with a supercharger 11 which consists of a subcylinder 12 and a subpiston 13 being fitly installed inside this subcylinder 12 free of slide motion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an internal combustion engine with a positive displacement supercharger used for a motorcycle.

[Conventional technology]

In an internal combustion engine having a volumetric supercharger (for example, a piston-type supercharger), a surge tank is usually provided downstream of the supercharger in order to dampen air pulsation. therefore,
In this type of internal combustion engine, in addition to the engine itself and a carburetor, other equipment such as a supercharger and a surge tank must be installed, and these various equipment must be connected to pipes, etc. They shall be connected in relation to each other by means of connection. In addition, when connecting the various devices mentioned above, it is necessary to shorten the pipes as much as possible and arrange them with few bends so as not to increase ventilation resistance.

[Problem that the invention seeks to solve]

By the way, in the case of motorcycles, the mounting space for the internal combustion engine is narrow and limited due to the structure, so when mounting the above-mentioned displacement type internal combustion engine with a supercharger, the internal combustion engine itself, carburetor, supercharger etc. In addition to arranging surge tanks as compactly as possible, it is also required that the pipes connecting these devices be short and with few bends.

The present invention has been made in view of the above circumstances, and allows the internal combustion engine main body, carburetor, supercharger, and surge tank to be arranged compactly, and the pipes connecting these devices to be short and with few bends. An object of the present invention is to provide an internal combustion engine with a supercharger for a motorcycle, which can be installed, has low ventilation resistance, and can achieve high output.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a cylinder head extending substantially horizontally in front of a crankcase fixed to a vehicle body, and provides an intake passage of the cylinder head oriented upward from the cylinder head. A positive displacement supercharger driven by a crankshaft in the crankcase via a connecting rod is integrally provided in the upper part of the crankcase, and a surge tank having a predetermined volume is provided above the cylinder head, and A vaporizer is provided in close proximity to the surge tank, and each of these devices is connected to a supercharger.

The surge tank, carburetor, and cylinder head are connected in this order through a connecting pipe.

[For production]

In the present invention, the cylinder head is provided to extend approximately horizontally, the surge tank and the carburetor are placed in the empty space above the cylinder head, and the supercharger is provided integrally with the crankcase. The equipment that makes up the system can be arranged compactly in one place. Furthermore, since each device is arranged in the order of air flow and close to each other, it is possible to connect each device with a short pipe with little bending, which results in low ventilation resistance and high output.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
Figure 2 is a side view of a motorcycle equipped with an internal combustion engine according to the present invention, Figure 2 is a schematic configuration diagram showing the arrangement of the internal combustion engine main body and its attached 94 devices, and Figure 943 is a cutaway dry surface diagram thereof. It is.

1 in FIG. 1 is fixed to approximately the center in the longitudinal direction of the vehicle body, and the cylinder radiator 2 is attached to the front of the crankcase 3 (
The main body of the single-cylinder internal combustion engine is installed to extend substantially horizontally (in front of the vehicle body), 4 is a surge tank located above the cylinder head 2, and 5 is a surge tank located diagonally below and to the right of the surge tank 4 ( The carburetor % 6, which is disposed close to the surge tank 4 (diagonally downward to the right with respect to the vehicle body), indicates an air cleaner which is disposed diagonally above the rear of the internal combustion engine main body 1, and among these devices, the internal combustion engine main body 1 As shown in FIG. 3, the carburetor 5 is arranged so that its center line is located within a vertical plane that includes the vehicle body center line, and the surge tank 4 is arranged so that its center line is located slightly to the left of the vertical plane. They are placed at different locations. In FIG. 7, 7 indicates a front wheel, 8 a rear wheel, 9 a seat, and 10 a handle.

To explain in detail the internal combustion engine main body 1 and its accessories, as shown in FIG. An integrally provided sub-cylinder 12. A sub-piston 13 is slidably fitted into the sub-cylinder 12, and one end is rotatably connected to the sub-piston 13, and the other end is rotatably connected to the base end of a connecting rod 14 on the power generation side. The connecting rod 15 is made up of a sub connecting rod 15. In addition, sub connecting rod 1
The other end of 5 may be rotatably connected directly to the crankshaft 16 without using the connecting rod 14. Further, the sub-cylinder 12 constituting the supercharger 11 is arranged such that its center @ line is located within a vertical plane including the vehicle body center line, similar to the ψ axis of the cylinder 17 on the power generation side, and the cylinder It is integrally provided in the crankcase 3 so as to form an included angle of approximately 90' with respect to the central axis of the crankcase 17.

A suction side reed valve 18 is provided at the outer end of the sub cylinder 12.
A plate 20 is attached to which a discharge valve 1 and a reed valve 9 are integrally assembled, and a connecting member 23 having two integrally formed pipes 2I and 22 is attached to the upper part of this plate 20. And Ha member 23
One side of one of the pipes 21 is connected to the air cleaner 6 via a contube 24, and the other side of the pipe 21 is connected to the suction side reed valve 18. In addition.

A primary throttle valve 25 operated in synchronization with a throttle fP (not shown) in the carburetor 5 is interposed in one W21 so as to be located within the same horizontal curve with respect to the carburetor 5. . Further, one side of the other pipe 22 of the connecting member 23 is connected to the surge tank 4 via the charge pipe 26, and the other side of the intermediate pipe 22 is connected to the discharge side reed valve 19. Here, since the surge tank 4 is located diagonally upward to the left with respect to the connection member 23, the charge pipe 26 is once swung upward, then bent to the left, and then further bent forward. Connected to surge tank 4.

The surge tank 4 temporarily stores the compressed air flowing from the supercharger 11 and supplies the stored compressed air to the downstream side in a state in which pulsations are attenuated.As shown in FIG. section 27 and the front side connection that changes the flow of compressed air flowing into the tank section 27 by 180 degrees and directs it to the downstream side @
It consists of 28. Also, there are 2 surge tanks 4 on the front and back.
It has a separable structure, and the front component #29 and the rear component 30 are connected to each other by bolts. The discharge port 91t+h of the surge tank 4 is connected to a suction passage 33 provided upwardly in the upper part of the cylinder head 2 via a connection pipe 31 between which the carburetor 5 is interposed and an inlet pipe 32. It is connected.

Next, the operation of the internal combustion engine with the above configuration will be explained.
When the internal combustion engine main body 1 is started, the supercharger 11 is driven and compressed air is supplied to the internal combustion engine main body 1.

To explain this supercharging operation, the crankshaft 16 rotates with the start of the internal combustion engine main body work, and the sub-piston 13 of the supercharger 11 is caused to reciprocate.

Here, if the movement of the sub-piston 13 in the direction of expanding the volume of the cylinder 12 is defined as forward movement, and the movement in the opposite direction is defined as backward movement, then the sub-piston 13 is in forward movement.

In this case, the suction side reed valve 18 is open and the discharge side reed valve 19 is closed, and outside air is sucked into the sub cylinder 12 via the air cleaner 6 and the contube 24. On the other hand, during double action, the circular pressure in the sub-cylinder 12 increases, so that the suction side reed valve 18 is closed and the discharge side reed valve 19 is opened.
The air sucked into the surge tank 2 is sent to the surge tank 4 through the charge pipe 26 while being compressed. The supply of compressed air to the surge tank 4 is carried out during the operation of the internal combustion engine main body.

The compressed air discharged from the supercharger 11 stored in the surge tank 4 has its pulsation damped! l! It is sent to the connecting pipe 31 and mixed with fuel when passing through the carburetor 5, and then passed through the inlet pipe 32 to the cylinder 17.
supplied to

Further, in the internal combustion engine, the supercharger 11. surge tank 4
．． Since the carburetor 5 is arranged above the internal combustion engine main body l so that its center line is located within a vertical plane that includes approximately the center line of the vehicle body, these devices can be arranged compactly in one place. It is extremely advantageous in terms of layout, and the pipes 23 and 26 that connect these devices and the pipes that connect the devices and the internal combustion engine main body 1 can be made shorter and have less bends, and the internal combustion engine has less suction resistance. High output can be achieved.

In addition, since the secondary throttle valve 25 and the carburetor 5 are arranged on the same plane, a wide range of tuning mechanisms such as wiring or link mechanisms can be used as a tuning mechanism to synchronize both components. It becomes possible to use it.

In addition, since the air passage in the surge tank 4 is bent by 180 degrees, the pipe resistance can be reduced compared to a configuration in which the connecting pipe has a small cross-sectional area and is bent by 1000 degrees, thereby further increasing the output of the engine. and supercharger 11
Since the pulsation caused by the discharge of the fuel can be efficiently attenuated, there is also the advantage that the output of one engine can be stabilized.

In addition, the suction side reed valve 18 and the discharge side reed valve 19,
Since it is assembled to one common plate 20 and attached to the sub-cylinder 12 while being integrated, assembly errors are reduced compared to a configuration in which the suction side reed valve 18 and the discharge side reed fP19 are assembled separately. It can be made smaller and quality can be improved, and the number of sealing parts can be reduced so reliability can be improved.

In addition, the space protruding toward the sub-cylinder 12 for accommodating fasteners such as bolts (this space becomes a dead space when viewed from the viewpoint of the air pressure network) can be reduced, and the compression ratio by the supercharger 11 can be reduced. can be increased.

Furthermore, a connecting member 23 in which the suction side and discharge side pipes 21 and 22 are integrated is connected to the plate 20, and the connecting member 23 is connected to the plate 20.
Since the configuration connects the contube 24 and charge pipe 25 to the plate 19, it is easier to assemble and make confectionery than a configuration in which the contube 24 and the charge pipe 25 are connected directly to the plate 19. Since the number of parts can be reduced, the weight can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, a cylinder head is provided to extend substantially horizontally in front of a crankcase fixed to a vehicle body, and the intake passage of the cylinder head is provided to be oriented upward from the cylinder head. A positive displacement supercharger driven by the crankshaft in the crankcase via a connecting rod is integrally provided in the upper part of the crankcase, and a surge tank having a predetermined volume is provided above the cylinder head, and A vaporizer is provided in close proximity to the surge tank, and each of these devices is connected to a supercharger.

Since the surge tank, carburetor, and cylinder head are connected in this order via a connecting pipe, the internal combustion engine main body, carburetor, supercharger, and surge tank can be arranged compactly, which is advantageous in terms of layout. In addition, the pipes that connect each device can be arranged in a short and less bent state, which reduces resistance on snowy roads, making it possible to achieve higher output from internal combustion engines. be effective.

[Brief explanation of the drawing]

FIG. 1 shows a motorcycle equipped with an internal combustion engine according to the present invention.
FIG. 2 is a schematic configuration diagram showing the arrangement of the internal combustion engine main body and its auxiliary equipment, and FIG. 3 is a partially cutaway plan view thereof. 1... Internal combustion engine body, 2... Cylinder head, 3... Crank case, 4...
・Surge tank, 5... Carburizer, 11...
...Supercharger, 12...Sub cylinder% 13.
...Sub piston% 15 ...Sub connecting rod, 16 ...Crankshaft, 18 ...
・Suction side reed valve, 19...Discharge side reed valve,
23... Connection member, 24... Contube% 26... Charge pipe, 31...
... Connection pipe, 32 ... Inlet pipe, 33 ... Suction passage. Figure 1

Claims (2)

[Claims] (1) A cylinder head is provided so as to extend approximately horizontally in front of a crankcase fixed to the vehicle body, and the intake passage of the cylinder head is oriented upward from the cylinder head, and the crankshaft in the crankcase A positive displacement supercharger driven via a connecting rod is integrally provided in the upper part of the crankcase, a surge tank having a predetermined volume is provided above the cylinder head, and a carburetor is provided adjacent to the surge tank. An internal combustion engine with a supercharger for a motorcycle, characterized in that each of these devices is connected via a connecting pipe in the order of a supercharger, a surge tank, a carburetor, and a cylinder head. (2) The supercharged internal combustion engine for a motorcycle according to claim 1, wherein the surge tank has an internal air passage bent by 180 degrees.