JPS5833218Y2 - Internal combustion engine intake and exhaust pipe equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of an intake and exhaust pipe system for a multi-cylinder internal combustion engine.By making each pipe a predetermined length, the so-called inertial effect and pulsation effect are utilized, and the system is made compact. The purpose is to simplify the process and manufacture.

By the way, in the intake and exhaust pipes of an internal combustion engine, when the valve opens, negative pressure is created in the intake pipe and positive pressure is created in the exhaust pipe at the valve side end of the pipe, and stiffness propagates inside the pipe. At the same time, it is reflected as a pressure wave with opposite positive and negative sides at the open end, but if this reflected wave returns to the valve side end just before the valve closes, the intake and exhaust efficiency will be improved ( By effectively utilizing the pulsation remaining in the pipe due to such broken pressure waves, it is possible to further improve the intake and exhaust efficiency in subsequent cycles (pulsation effect).

However, in order to achieve these effects, it is necessary to set the pipe line to a predetermined length, and as a result, especially for multi-cylinder engines, the intake and exhaust pipe devices become large, which causes space and manufacturing problems. It happens.

The present invention was developed in view of the above circumstances, and aims to take advantage of the above-mentioned effects by setting each pipe line to a predetermined length in the intake and exhaust pipe system of a multi-cylinder internal combustion engine. The pipes connected to the rear cylinder are bent at the rear, and the pipes connected to the rear cylinder are bent at the front so as to be parallel to the engine body. By facing each other at the junction, they are joined in a cross-overlapping state.

This makes the tube device more compact and makes manufacturing easier than when all the tubes are integrally formed.

This will be explained below with reference to the embodiment shown in the drawings. Reference numeral 1 denotes the engine body, and cylinder heads of each of the cylinders 2a to 2fIIi.

Reference numeral 3 denotes an intake or exhaust pipe device having pipes 4a to 4f each having one end connected to each head and having a predetermined length.
a collection portion 3a consisting of pipes 4a to 4c connected to;
Pipe line 4d connected to heads 2d to 2f located at the rear
It is divided into a collection part 3b consisting of ~4f, each formed separately, and the former pipes 4a to 4c are parallel to the engine body at the rear, and the latter pipes 4d to 4f/I'i are parallel to the front. The two joint sections 3a and 3b are joined in a cross-overlapping state by symmetrically facing the intermediate contact portions.

Here, as a means for connecting the image parts, protrusions 5a and 5b may be formed at several corresponding locations on the image parts as shown in the figure, and the means may be connected with bolts 6, or other means such as welding, band tightening, etc. may be used. .

According to the above configuration, each of the pipes 4a to 4f has a predetermined length, so that the inertia effect and the pulsation effect are realized, and these effects improve the intake and exhaust efficiency, and the output increase method is the exhaust The performance of the engine will be improved, such as by improving the gas supply, and in that case, the device 3 will include a collection section 3a consisting of pipes 4a to 4c connected to the front heads 2a to 2c, and a rear head 2d to 2f. It is divided into a collection part 3b consisting of pipes 4d to 4f connected to the engine body, and both of these collection parts are superimposed in a cross-shaped manner with the middle opposing parts facing each other while being parallel to the engine body. The overall device is compact, which eliminates space problems, and makes manufacturing and casting much easier than if all the pipes were integrally formed.

As described above, the present invention provides an intake and exhaust pipe system for a multi-cylinder internal combustion engine in which each pipe line has a predetermined length, and the pipe line connected to the front cylinder is located at the rear.

The pipes connected to the rear cylinders are bent to be parallel to the engine body with the pipes connected to the rear cylinders forming a collection part at the front, and these pipe collection parts are formed separately and intersect so as to face each other at the intermediate contact part. By configuring the pipes to be connected in a stacked state, an inertia effect and a pulsation effect are realized, which improves the intake and exhaust efficiency, which improves engine performance and makes the entire pipe system more compact. As a result, the space problem is solved, manufacturing becomes easy, and an intake/exhaust pipe device with excellent practicality can be realized.

It goes without saying that the present invention may be implemented on both the intake side and the exhaust side, or may be implemented on only one of them as required.

[Brief explanation of the drawing]

FIG. 1 is a side view of an internal combustion engine embodying the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is an enlarged sectional view taken along lines 1 to 2 in FIG. 3 is an intake and exhaust pipe device, and 4a to 4f are pipes.

Claims (1)

[Scope of utility model registration request] Each conduit is made to have a predetermined length, and the conduit connected to the front cylinder is bent backward, and the conduit connected to the rear cylinder is bent forward, parallel to the engine body. 1. An intake and exhaust pipe device for an internal combustion engine, characterized in that both converging portions of the pipes are formed separately, and the intermediate opposing portions are joined by appropriate means in a crossed overlapping state.