JPH0712670Y2 - Variable inertia pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a variable inertia pipe installed in an intake / exhaust system of an engine to provide an inertia supercharging effect.

2. Description of the Related Art Means for giving an inertia supercharging effect to an intake system of an engine is a known technique, and various means have been disclosed. Inertial supercharging, for example, selects the intake pipe length so that the peak of the positive pressure due to air column vibration generated in the pipe in the intake system reaches near the intake valve immediately before the intake valve closes, and The supercharging method of filling the dense intake air is said.

Since the wavelength of the air column vibration generated in the pipe varies depending on the engine speed, the pipe length must be changed in accordance with the change in the engine speed to provide the inertia supercharging effect. In general, since the pipe length is variable, for example, if the pipe length is selected to match the low speed side (longer pipe length), the pipe length is too long on the high speed side, and the inertia supercharging effect is not provided. In order to solve this, in the technique disclosed in Japanese Patent Laid-Open No. 57-148024, intake / exhaust pipes for 1, 2, 3 cylinders and intake / exhaust pipes for 4,5, 6 cylinders of a 6-cylinder engine are provided with open / close valves. It is connected by a communication pipe, and the equivalent pipe length is changed by opening and closing the on-off valve so that an inertia supercharging effect is exerted over both high and low speed regions of the engine.

Problems to be Solved by the Invention Although the conventional technology can provide the effect of inertial supercharging at high speed and low speed, the intake pipe occupies a large space because the intake pipe length is adjusted to a low speed, and the engine layout is difficult. There is a drawback that it is not good.

The present invention solves these drawbacks, and provides a variable inertia pipe that is compact as a whole, has an easy engine layout, and can control the equivalent pipe length variably to provide an inertia supercharging effect from low speed to high speed. is there.

Means for Solving the Problems In order to solve the above problems, the present invention provides a chamber having a cross-sectional area wider than the cross-sectional area of a pipe constituting an intake / exhaust system, and the chamber when closed. While short-circuiting between the pipes connected to both ends of the chamber and opening the pipes, the base ends of the on-off valves, which are opened and expanded toward the inner wall of the chamber when opened, are axially attached to the opening edges of the pipes at both ends of the chamber. It is characterized by having done.

Action When the open / close valve is closed, the pipes connected to both ends of the chamber are short-circuited via the open / close valve, so the air flowing out from one pipe is introduced into the other pipe without spreading. It When the on-off valve is opened, the air flowing out from one pipe smoothly diffuses into the chamber under the guide action of the on-off valve axially attached to the opening edge of this pipe, and then opens and closes on the opposite side. Upon receiving the converging action of the valve, the flow is smoothly collected to the open end of the other pipe. Therefore, since the equivalent pipe length of the intake / exhaust system changes in response to the opening / closing of the on-off valve, an effective inertia supercharging operation is performed by opening / closing the on-off valve in accordance with the engine load, rotation speed, etc. be able to.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As described above, the inertia supercharging is given by a long pipe length when the engine speed is low, and it is necessary to shorten the pipe length as the engine speed is increased. On the other hand, the inertia supercharging can be changed not only by the tube length but also by the tube volume. That is,
If the tube volume is large, the same effect is provided by increasing the tube length, and if the tube volume is small, it is equivalent to the case where the tube length is short. The present invention is based on the above principle, and one embodiment thereof is shown in FIGS. 1 and 2. The present invention is applicable to both intake and exhaust systems, but this embodiment shows a case where it is applied to an intake system.

A chamber 2 having a cross-sectional area larger than that of the intake pipe 1 is provided between the intake pipes 1. In this embodiment, the chamber 2 is formed of a rectangular parallelepiped. The connection between the intake pipe 1 and the chamber 2 is connected by the smooth curve 3 in the present embodiment, but the connection is not limited to this.

As best shown in FIG. 2, hinge pins 4 are arranged facing each other at the inlet and outlet of the intake pipe 1, and an on-off valve 5 is pivotally supported.
The on-off valve 5 is formed so as to extend in the longitudinal direction of the chamber 2, and is formed so as to extend over the entire width of the chamber 2. As shown in FIG. 3, in the closed state, the opening / closing valve 5 is separated by a distance approximately equal to the diameter of the intake pipe. It is formed so as to be connected via a minute gap δ. That is, the intake pipes 1, 1 connected to the front and rear ends of the chamber 2 are arranged so as to be short-circuited by the open / close valve 5.

As shown in FIG. 2, the opening degree of the on-off valve 5 around the hinge pin 4 is determined by the rotation of an actuator (not shown) connected to the hinge pin 4, and the actuator is controlled by a control device 6 such as a CPU connected thereto. The control device 6 controls opening and closing of the on-off valve 5 by the actuator according to the engine load and the engine speed.

Next, the operation of this embodiment will be described.

When the engine speed is low, the on-off valve 5 is fully opened as shown in FIG. 2, and the on-off valve 5 is rotated to such a position as to come into contact with the inner wall of the chamber 2. As a result, the air flow from the arrow A spreads in the arrow B direction along the on-off valve 5, advances as shown by the arrow C, and is sent in the arrow D direction. That is, I, II, III, IV, V and VI of FIG. 2 are provided between the intake pipes 1 and 1 connected to both ends of the chamber 2.
This means that a chamber equal to the volume surrounded by is provided, and the pipe volume is increased by this amount, and the same effect as if the equivalent pipe length is increased can be provided. Therefore, by selecting an appropriate volume, the inertia supercharging effect at low engine speed can be provided.

On the other hand, when the engine speed is high, the on-off valve 5 is horizontally closed as shown in FIG. 3, and the intake pipes 1 and 1 are short-circuited as described above to eliminate the spread of the air flow. This allows the intake pipe
The tube volume between 1 and 1 hardly expands, and the equivalent tube length is shorter than that of the above. This makes it possible to provide an inertia supercharging effect at high speed.

As described above, by opening and closing the on-off valve 5 in the chamber 2, it is possible to provide the inertia supercharging effect at high and low engine speeds. Further, since the base end of the on-off valve 5 is axially attached to the opening edges of the pipes 1 and 1 at both ends of the chamber 2, the on-off valve 5 is closed and rotated horizontally as shown in FIG. Not only when the intake pipes 1 and 1 are short-circuited, but also when the open / close valve 5 is expanded and rotated to increase the equivalent pipe length, the air flowing out from the upstream intake pipe 1 is not removed from the upstream open / close valve 5. After being smoothly diffused into the chamber 2 by receiving the guiding action, it is smoothly converged at the opening end of the intake pipe 1 on the downstream side by being converged by the opening / closing valve 5 on the downstream side. Therefore, the flow of air in the chamber 2 can be made smooth regardless of whether the on-off valves 5, 5 are opened or closed, and a decrease in the supercharging effect due to an increase in air resistance can be suppressed. Effective inertia supercharging can be performed in combination with the change in equivalent pipe length due to opening and closing of.
FIG. 4 shows another embodiment of the present invention.

In the above-mentioned embodiment, the on-off valves 5 are arranged on the left and right sides of the chamber 2 in the drawing, and they are formed so as to match at the center. However, in this embodiment, they face the center of the chamber 2 at substantially the same interval as the diameter of the intake pipe 1. The fixing plate 7 is provided, and the opening / closing valve 5A is arranged between the fixing plate 7 and the inlet / outlet port of the chamber 2.

Therefore, as in the embodiment shown in FIG.
When the fixed plate 7 is interposed between A, the opening / closing valves 5A, 5A, which are moving parts, can be downsized, so that the switching response of the equivalent pipe length according to the change of the engine speed can be enhanced. There are advantages.

Effect of the Invention As is clear from the above description, according to the present invention, the equivalent pipe length can be easily changed with a simple structure, and the effect of providing the inertia supercharging effect in a wide region of the engine can be enhanced. Further, since the base end of the on-off valve is axially attached to the opening edges of the pipes at both ends of the chamber, the air flow in the chamber can be made smooth regardless of whether the on-off valve is opened or closed. It is also possible to suppress a decrease in supercharging effect due to an increase in resistance.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a side view for explaining the operation of the embodiment, and FIG. 4 is another embodiment of the present invention. FIG. 1 ... intake pipe, 2 ... chamber, 3 ... curve, 4 ...
... Hinge pin, 5,5A ... Open / close valve, 6 ... Control device, 7 ...
… Fixed plate.

Claims (1)

[Scope of utility model registration request] 1. In a variable inertia pipe provided in an intake / exhaust system of an engine and formed to provide an inertia supercharging effect, a cross-sectional area wider than a cross-sectional area of the pipe constituting the intake / exhaust system is provided. A chamber having a chamber is provided, and at the time of closing, the pipes connected to both ends of the chamber are short-circuited, while at the time of opening, the base end of the on-off valve which is expanded and rotated toward the inner wall side of the chamber is connected to the chamber. A variable inertia pipe which is axially attached to the opening edges of the pipes at both ends.