JPS599083Y2 - Connection device between engine body and carburetor in internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple connecting device for integrally connecting an intake passage leading to a combustion chamber formed in an engine body and a mixture passage of a carburetor.

For example, as shown in Japanese Utility Model Publication No. 43-979, the above device includes a cylindrical insulator made of heat-resistant rubber or the like that connects the opening end of the intake passage of the engine body and the downstream end of the mixture passage of the carburetor. In this type of insulator, it is possible to effectively prevent vibrations and heat from the engine body from being transmitted to the carburetor, but on the other hand, it has the following drawbacks: Ta.

That is, in the above method, in order to secure the insulator to the opening end of the intake passage, a mounting flange is provided protruding from the annular mounting member on which the insulator is baked and the opening end of the intake passage to which it is joined. Since both mounting flanges are connected by a plurality of bolts, there are drawbacks such as the work of joining is troublesome and requires a relatively large space.

In order to eliminate such drawbacks, for example,
As shown in Publication No. 42, there is a known device in which a pusher with a cylindrical insulator baked on the outer periphery can be screwed directly onto the intake passage opening. The insulator is baked over the entire outer circumferential surface, and the middle part of the insulator is sandwiched in the axial direction between the opening end face of the intake passage and the end face of the carburetor mixture passage. If the screw is screwed into the opening too much, the end face of the intake passage opening will strongly press and deform the middle part of the insulator in the axial direction, making it easy for the baked surfaces of the insulator and the pusher to separate. If this happens, there will be problems such as having to replace the parts with new parts when reassembling.

The present invention has been proposed in view of the above, and its purpose is to provide a connection device between the engine main body and the carburetor in an internal combustion engine, which has a simple structure and can eliminate all of the above-mentioned drawbacks and problems of conventional devices. be.

An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, the device of the present invention is applied to a type 4 multi-cylinder four-stroke internal combustion engine. It has a first engine body E1 formed by integrally joining a cylinder block 1, a cylinder head 2, and a crankcase 3, and a second engine body E2, and the first engine body E1 is laterally connected to the second engine body E2. are arranged in the longitudinal direction, and a side V-shaped space 4 is formed between the engine bodies E1 and E2.

The V-shaped space 4 includes a vertically ventilated first carburetor C1 for supplying an air-fuel mixture to the first engine body E1, and a first carburetor C1 for supplying an air-fuel mixture to the second engine body E2. A second vaporizer C2 of a horizontally ventilated type for supplying gas is arranged in parallel.

The first engine main body E1 includes a first carburetor C1, and a second carburetor C1.
The second carburetors C2 are respectively connected to the engine body E2, and since their connecting devices J have exactly the same structure, the structure of the connecting device between the first engine body E1 and the first carburetor C1 will be described below. To explain this, an intake passage 8 is formed in the cylinder head 2 of the first engine body E1 and communicates with the combustion chamber 6 above the piston 5 via an intake valve 7.
A pusher 9 is screwed onto the open end of the pusher 9.

The push 9 has one end screwed directly into the opening of the intake passage 8, and the other end where the end of a cylindrical insulator 11 made of a heat-resistant elastic material such as heat-resistant rubber is fitted onto the outer peripheral surface and baked. , the opening end face of the intake passage 8 and the insulator 11
The insulator 11 is interposed between the end faces and is inserted from the opening end face.
The pusher 9 and the insulator 11 have an annular groove 10 and an annular protrusion 10a that engage with each other on the fitting surface of the pusher 9 and the insulator 11.

A small diameter portion 13 shaped at the downstream end of the air-fuel mixture passage 12 of the first carburetor C is fitted into the outer end of the insulator 11, and a tightening band 14 is wrapped around the outer periphery of the insulator 11. By tightening this, the downstream end of the mixture passage 12 of the first carburetor C can be fixed to the insulator 11.

As described above, the downstream end of the mixture passage 12 of the first carburetor C1 can be integrally connected to the open end of the intake passage 8 via the pusher 9 and the insulator 11 in a communicating state.

Therefore, the air-fuel mixture that has been revived by the first carburetor C1 is sucked into the combustion chamber 6 through the mixture passage 12 and the intake passage 8 during the downward intake stroke of the piston 5. Push 9 is
This prevents heat and vibration from the first engine body E1 from being transmitted to the first carburetor C1, and also serves to prevent leakage of the air-fuel mixture and suction of atmospheric air.

In addition, the intake passage 8 of the second engine main body E2 and the second carburetor C2
The air-fuel mixture passage 12 is also integrally connected to the connecting device J.

As described above, according to the present invention, a cylindrical insulator made of heat-resistant rubber or the like is fitted and baked around the outer periphery of the open end of the intake passage formed in the engine body and leading to the combustion chamber. The downstream end of the mixture passage of the carburetor is fitted and tightened to the insulator end, so simply screw the pusher directly into the opening of the intake passage to place the insulator end in place in the engine body. It can be easily and firmly installed, requires only a small space for installation, and the installation work is easy and highly efficient.

In particular, since a flange portion integrally formed with the push is sandwiched between the end face of the opening of the intake passage and the end face of the insulator, when screwing the push into the opening of the intake passage, the amount of screwing is controlled. The insulator itself, which can be reliably controlled by the contact between the flange portion and the end surface of the intake passage opening, and which is separated from the end surface of the intake passage opening while sandwiching the flange portion, is free from external forces, such as compressive force, from the end surface of the intake passage opening. Therefore, even if the pusher is accidentally screwed into the intake passage opening, there is no fear that the mating surface between the insulator and the pusher will peel off, and the insulator can be used for a long time. It can be used effectively without replacement.

Furthermore, on the fitting surface between the push and the insulator,
Since the annular groove and the annular protrusion are formed to engage with each other, even if the mating surface of the insulator and the pusher comes apart, the engagement between the annular groove and the protrusion will prevent It is possible to effectively prevent the insulator from being released from the push, and the intended function of the insulator can be effectively connected.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a V-type multi-cylinder four-stroke internal combustion engine equipped with the device of the present invention, and FIG. 2 is a partially enlarged sectional view of FIG. 1. Ce, C2...first and second vaporizers as vaporizers, E
1, E2...first and second engine bodies as engine bodies,
6... Combustion chamber, 8... Intake passage, 9... Push, 9a... Flange portion, 10... Annular groove, 10 a
...Annular projection, 11...Insulator.

Claims (1)

[Scope of utility model registration request] A cylindrical insulator made of heat-resistant rubber or the like is fitted on the outer periphery of the open end of the intake passage that is formed in the engine body and leads to the combustion chamber, and a baked pusher is screwed onto the insulator. In a connection device between an engine main body and a carburetor in an internal combustion engine, which is formed by fitting and tightening the downstream end of an air passage, the pusher is integrally connected between an opening end face of the intake passage and an end face of the insulator. An engine main body and a carburetor in an internal combustion engine, characterized in that a shaped flange portion is held between the pusher and the insulator, and the fitting surface of the pusher and the insulator has an annular groove and an annular protrusion that engage with each other. Connection device with the device.