JPS5817336B2 - Internal combustion engine intake and exhaust pipe equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an intake and exhaust pipe device for a multi-cylinder in-line internal combustion engine, in which each pipe is made to have a predetermined length to utilize the so-called inertia effect and pulsation effect, and the intake and exhaust pipe This allows the device to be made more compact.

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 at the eave side end of the pipe in the exhaust pipe, and this propagates inside the pipe. At the same time, it is reflected as a pressure wave with opposite positive and negative sides at the opening, but if this reflected wave returns to the eave side end just before the valve closes, the filling efficiency in the intake pipe will improve. In the exhaust pipe, the exhaust efficiency improves (inertia effect), and by effectively utilizing the pulsation that remains in the pipe due to such pressure waves, the intake and exhaust efficiency will be improved in the next cycle as well. (pulsation effect).

However, in order to achieve these effects, it is necessary to set the length of the pipe to a predetermined length, and conventionally, in single-cylinder engines, each cylinder is equipped with a pipe of a predetermined length. The reality is that this is not implemented, mainly due to space constraints.

The present invention has been made in view of the above circumstances, and in a multi-cylinder in-line internal combustion engine, a plurality of pipes connected to each cylinder are each of a predetermined length, and a cylinder in the front half of the engine is connected to a plurality of pipes of a predetermined length. The pipes to be connected are bent in an L shape so that the pipes to be connected to the cylinders in the rear half are directed toward the rear, and the pipes to be connected to the cylinders in the rear half are bent in an L shape so that the pipes extend in a straight line parallel to the side of the engine, and The parallel portions of the pipes are overlapped with each other, thereby making use of the above-mentioned effects and realizing a compact intake/exhaust device as a whole, which will be explained below with reference to an embodiment shown in the drawings.

First, Figures 1 to 3 show the case of a two-cylinder engine, where 1 is the engine body, and 2a and 2b are cylinder heads for each cylinder.

Reference numeral 3 denotes an intake or exhaust pipe device, which has pipes 3a and 3b connected at one end to each of the above heads, and also has pipes 3a and 3b connected to the heads 2 at the front.
The conduit 3a connected to a is connected to the rear head 2
The pipes 3b connected to the pipes 3b are bent in an L shape at the side of the engine so as to face forward, and the straight parallel parts of the pipes are overlapped with each other. It has a predetermined length necessary to achieve the effect and the pulsating effect.

Next, FIG. 4 shows the case of a six-cylinder engine, and in this embodiment, a pipe line 13a is connected to the front half cylinder heads 12a, 12b, and 12c of the intake and exhaust pipe device 13.

13b and 13c are bent rearward, and conduits 13d, 13e, and 13f connected to the rear half heads 12d, 12e, and 12f are bent forward and connected to each other in parallel straight sections on the side of the engine. The conduits are superimposed on each other, and each conduit has a predetermined length as in the previous embodiment.

According to the above configuration, the length necessary for realizing the inertial effect and the pulsation effect is secured for each conduit.
These effects improve the performance of the engine, such as increasing output or improving exhaust gas, and in this case, the straight sections of the pipes that are parallel to the engine and oriented in the longitudinal direction overlap each other. Because of this, the pipe device as a whole becomes compact, and therefore there are no problems with space.

Note that the above configuration may be implemented on both the intake side and the exhaust side, or may be implemented on only one of them as necessary.

As described above, the present invention provides a multi-cylinder in-line internal combustion engine in which a plurality of pipes connected to each cylinder are made to each have a predetermined length, and the pipes connected to the front cylinder are moved rearward and backward. The pipes connected to the cylinders are bent in an L shape so as to face forward, creating a structure in which the straight parts parallel to the engine side overlap each other, making the inertia effect and pulsation effect effective. In addition, the straight sections of each pipe approach the side of the engine in parallel, resulting in a compact intake and exhaust pipe system, which improves engine performance without creating problems such as space. It has the effect of forcing you to do so.

[Brief explanation of the drawing]

Fig. 1 is a side view showing one embodiment of the present invention, Fig. 2 is a plan view, Fig. 3 is a sectional view taken along line 11-1 in Fig. 1, and Fig. 4 is a side view showing another embodiment. It is. 3.13 is an intake and exhaust pipe device, 3a, 3b, 13a~
13f is a pipe.

Claims (1)

[Claims] 1 It has a plurality of pipes each having one end connected to a cylinder arranged in series, and each pipe has a predetermined length, and is connected to the cylinder in front by being bent in an L shape. A parallel section extending straight in parallel in opposite directions so that the pipe connected to the rear cylinder faces rearward and the pipe connected to the rear cylinder faces forward, and is located on the side of the engine of the pipe. An intake and exhaust pipe device for an internal combustion engine, characterized in that the pipes are stacked on top of each other.