JPS5941302Y2 - V-type multi-cylinder internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ■-type multi-cylinder internal combustion engine for use in vehicles, etc.

Generally, in a V-type multi-cylinder internal combustion engine, multiple carburetors for supplying air-fuel mixture to the cylinder bodies of each row cannot be arranged side by side in one direction. This problem not only complicates the structure of the intake passage that connects the air cleaners, but also makes it difficult to make it compact.

Therefore, in the present invention, a common carburetor storage case is provided in the space formed between the first and second row cylinder bodies arranged in a V-shape, and a plurality of carburetors are housed inside this carburetor storage case. In addition to storing and fixing the carburetors, each intake passage inlet of the carburetor is opened directly, and the inside of the carburetor storage case is communicated with the atmosphere via an air cleaner, and the inside of the carburetor storage case is connected to a plurality of air cleaners. The main object of this invention is to provide a type 1 multi-cylinder internal combustion engine with a simple structure, which eliminates the problems of the conventional engine by allowing the intake passages of the individual carburetors to be formed into a communicating intake passage.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. A V-type multi-cylinder four-cycle internal combustion engine E, which constitutes the main body of a power unit P mounted on a vehicle such as a two-wheeled vehicle, is arranged in the shape of a square with respect to the other. It has a first row of cylinder bodies 1 and a second row of cylinder bodies 2, and a ■-shaped space C is formed between these cylinder bodies 1.2.

The cylinder bodies 1 and 2 of the first and second rows are housed in a common crankcase 3, with a cylinder block 4 and a cylinder head 5, respectively.
Each cylinder block 4 is formed with a cylinder hole 6 as usual, and a piston 7 that slides into these cylinder holes 6 is rotated to the crankcase 3 via a connecting rod 8. It is connected to one crankshaft 9 that is freely mounted.

Further, each cylinder head 5 is formed with an intake port 10 toward the inside thereof, that is, toward the V-shaped space C, and an exhaust port 11 toward the outside thereof in a uniflow type. Suction to open and close 11 valve ports;
Exhaust valves 12.13 and valve operating mechanisms 14.15 for opening and closing them are provided as usual.

A V formed between the first and second rows of cylinder bodies 1 and 2
A carburetor storage case 16 is disposed in the shaped space C, and the cylinder bodies 1 and 2 of the 1st and 2nd rows are placed in this case 16.
A plurality of carburetors 17 for supplying an air-fuel mixture are housed and integrally mounted within.

The carburetor storage case 16 is composed of a case body 18 and a cover 19 that is removably attached to the opening of the case body 18, and the case body 18 covers the cylinders of the first and second rows of cylinder bodies 1 and 2. It is supported by the head 5, and the intake passages 200 Å of the plurality of carburetors 17 are respectively connected to the carburetor storage case 1.
6, and the outlets of these intake passages 20 are communicated with the intake ports 10 of the first and second rows of cylinder bodies 1゜2 through through holes 21 formed in the case body 18, respectively. The air-fuel mixture adjusted to an appropriate air-fuel ratio by the carburetor 11 is supplied to the cylinder bodies 1 and 2 of the first and second rows, respectively.
can be supplied to

A communication port 22 is opened in the cover 19 to communicate the interior of the carburetor storage case 16 with the atmosphere, and a cleaner case 24 of an air cleaner 23 is inserted into the communication port 22.

Note that 25 and 26 are choke valves and throttle valves provided in the intake passage 20.

Next, the operation of the embodiment of the present invention will be explained. When the engine is operated and negative intake pressure is generated in the cylinder bodies 1.2 of the 1st and 2nd rows, the atmosphere is purified through the air cleaner 23. After that, the mixture enters the carburetor storage case 16 and flows into the intake passages 20 of the plurality of carburetors 17 through this mechanism, and the air-fuel mixture adjusted to the appropriate air-fuel ratio by this mechanism is transferred to the 1st and 2nd rows. The air is drawn into the combustion chamber above the piston 7 through the intake ports 10 in the cylinder bodies 1 and 2.

In the above embodiment, the air cleaner case 24 may be formed integrally with the carburetor storage case 16 or may be formed separately.

As described above, according to the present invention, the first row of cylinder bodies and the second row of cylinder bodies are arranged in a V-shape, and a common carburetor is disposed in the space formed between the cylinder bodies. A plurality of carburetors for supplying air-fuel mixture to the cylinder bodies of the first and second rows are housed and fixed inside the storage case, and the intake passage entrances of the carburetors are directly connected to each other. Open the vaporizer storage case, and then flush the inside of the vaporizer storage case with air 1. Since it communicated with the atmosphere through the I-su,
Despite the fact that this is a type multi-cylinder internal combustion engine where multiple carburetors cannot be arranged in a fixed force direction due to its structure, each carburetor can be installed regardless of its position or direction. The case itself can be effectively used as an intake passage that communicates each carburetor with the air cleaner. Therefore, for example, when the intake passages of each carburetor open in opposite directions or are separated from each other, However, only one small air cleaner is required to communicate with the intake duct entrance.
The configuration of the intake system can be simplified, contributing to cost reduction and improved assembly efficiency.

Moreover, the vaporizer storage case is for storing each vaporizer in its entirety, and there should be no particular restrictions on the position, direction, size, etc. of the installation of each vaporizer.
In the narrow ■-shaped space between the 2nd and 1st fuser bodies, multiple vaporizers and their storage cases placed close to each other can be compactly arranged and arranged easily, and as mentioned above, the air cleaner can be placed in one small size Coupled with this, the overall configuration of the intake system can be made significantly more compact.

In addition, multiple vaporizers are pre-assembled in the vaporizer storage case,
In addition, since it is possible to perform synchronization and other adjustments for the assembled items in advance, simply assembling the carburetor storage case to the engine body automatically completes the assembly of each carburetor to the engine body. Moreover, there is no need to make adjustments such as mutual synchronization between the carburetors later, and as a result, the work of assembling the carburetors to the engine body can be carried out extremely efficiently and accurately.

Furthermore, since the inside of the carburetor storage case in which multiple carburetors are stored is communicated with the atmosphere through an air cleaner, only clean air can always be introduced into the case, and each carburetor can use an air cleaner. Since the NR is directly exposed to outside air that does not pass through, there is no risk of dust, rainwater, etc. entering various parts of the carburetor, and the carburetor can always operate properly.

Furthermore, multiple carburetors are stored in a carburetor storage case and are effectively protected from collisions with other objects and the heat of the engine body, so it is necessary to assemble the engine not only before, but also during assembly. The attachment will not collide with other objects or become overheated later, and malfunction of the carburetor due to collision or overheating can be prevented.

In the present invention, the carburetor storage case includes the connecting member between each carburetor, the intake passage between each carburetor and the air cleaner, and the structure that prevents each carburetor from colliding with other objects, dust on each part, etc.
Since it can be used in common with the protection member for protecting the heat of the engine body and the heat of the engine body, the structure is simple and can contribute to cost reduction.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawing is a longitudinal sectional side view of a main part of a power unit equipped with a type II multi-cylinder internal combustion engine according to the present invention. 1... First row cylinder body, 2...
2nd row cylinder body, 16...carburizer storage case, 11...carburizer, C...■-shaped space.

Claims (2)

[Scope of utility model registration request] (1) The cylinder bodies of the first row and the cylinder bodies of the second row are arranged in a V-shape, and the above-mentioned A plurality of carburetors for supplying air-fuel mixture to the cylinder bodies of the first and second rows are housed and fixed, and the intake passage entrances of the carburetors are opened directly,
Furthermore, the V-type multi-cylinder internal combustion engine is configured such that the interior of the carburetor storage case is communicated with the atmosphere via an air cleaner. (2) The type 2 multi-cylinder internal combustion engine according to claim 1 of the above-mentioned utility model registration, wherein a part of the carburetor storage case also serves as an air cleaner case.